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);
 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) / 2 + 1);
 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);
 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) / 2);
 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 static 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 mutex 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_mutex 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 void vc_deallocate(unsigned int currcons)
 989 {
 990         WARN_CONSOLE_UNLOCKED();
 991
 992         if (vc_cons_allocated(currcons)) {
 993                 struct vc_data *vc = vc_cons[currcons].d;
 994                 struct vt_notifier_param param = { .vc = vc };
 995
 996                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 997                 vcs_remove_sysfs(currcons);
 998                 vc->vc_sw->con_deinit(vc);
 999                 put_pid(vc->vt_pid);
1000                 module_put(vc->vc_sw->owner);
1001                 kfree(vc->vc_screenbuf);
1002                 if (currcons >= MIN_NR_CONSOLES)
1003                         kfree(vc);
1004                 vc_cons[currcons].d = NULL;
1005         }
1006 }
1007
1008 /*
1009  *      VT102 emulator
1010  */
1011
1012 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1013 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1014 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1015
1016 #define decarm          VC_REPEAT
1017 #define decckm          VC_CKMODE
1018 #define kbdapplic       VC_APPLIC
1019 #define lnm             VC_CRLF
1020
1021 /*
1022  * this is what the terminal answers to a ESC-Z or csi0c query.
1023  */
1024 #define VT100ID "\033[?1;2c"
1025 #define VT102ID "\033[?6c"
1026
1027 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1028                                        8,12,10,14, 9,13,11,15 };
1029
1030 /* the default colour table, for VGA+ colour systems */
1031 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1032     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1033 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1034     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1035 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1036     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1037
1038 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1039 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1040 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1041
1042 /*
1043  * gotoxy() must verify all boundaries, because the arguments
1044  * might also be negative. If the given position is out of
1045  * bounds, the cursor is placed at the nearest margin.
1046  */
1047 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1048 {
1049         int min_y, max_y;
1050
1051         if (new_x < 0)
1052                 vc->vc_x = 0;
1053         else {
1054                 if (new_x >= vc->vc_cols)
1055                         vc->vc_x = vc->vc_cols - 1;
1056                 else
1057                         vc->vc_x = new_x;
1058         }
1059
1060         if (vc->vc_decom) {
1061                 min_y = vc->vc_top;
1062                 max_y = vc->vc_bottom;
1063         } else {
1064                 min_y = 0;
1065                 max_y = vc->vc_rows;
1066         }
1067         if (new_y < min_y)
1068                 vc->vc_y = min_y;
1069         else if (new_y >= max_y)
1070                 vc->vc_y = max_y - 1;
1071         else
1072                 vc->vc_y = new_y;
1073         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1074         vc->vc_need_wrap = 0;
1075 }
1076
1077 /* for absolute user moves, when decom is set */
1078 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1079 {
1080         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1081 }
1082
1083 void scrollback(struct vc_data *vc, int lines)
1084 {
1085         if (!lines)
1086                 lines = vc->vc_rows / 2;
1087         scrolldelta(-lines);
1088 }
1089
1090 void scrollfront(struct vc_data *vc, int lines)
1091 {
1092         if (!lines)
1093                 lines = vc->vc_rows / 2;
1094         scrolldelta(lines);
1095 }
1096
1097 static void lf(struct vc_data *vc)
1098 {
1099         /* don't scroll if above bottom of scrolling region, or
1100          * if below scrolling region
1101          */
1102         if (vc->vc_y + 1 == vc->vc_bottom)
1103                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1104         else if (vc->vc_y < vc->vc_rows - 1) {
1105                 vc->vc_y++;
1106                 vc->vc_pos += vc->vc_size_row;
1107         }
1108         vc->vc_need_wrap = 0;
1109         notify_write(vc, '\n');
1110 }
1111
1112 static void ri(struct vc_data *vc)
1113 {
1114         /* don't scroll if below top of scrolling region, or
1115          * if above scrolling region
1116          */
1117         if (vc->vc_y == vc->vc_top)
1118                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1119         else if (vc->vc_y > 0) {
1120                 vc->vc_y--;
1121                 vc->vc_pos -= vc->vc_size_row;
1122         }
1123         vc->vc_need_wrap = 0;
1124 }
1125
1126 static inline void cr(struct vc_data *vc)
1127 {
1128         vc->vc_pos -= vc->vc_x << 1;
1129         vc->vc_need_wrap = vc->vc_x = 0;
1130         notify_write(vc, '\r');
1131 }
1132
1133 static inline void bs(struct vc_data *vc)
1134 {
1135         if (vc->vc_x) {
1136                 vc->vc_pos -= 2;
1137                 vc->vc_x--;
1138                 vc->vc_need_wrap = 0;
1139                 notify_write(vc, '\b');
1140         }
1141 }
1142
1143 static inline void del(struct vc_data *vc)
1144 {
1145         /* ignored */
1146 }
1147
1148 static void csi_J(struct vc_data *vc, int vpar)
1149 {
1150         unsigned int count;
1151         unsigned short * start;
1152
1153         switch (vpar) {
1154                 case 0: /* erase from cursor to end of display */
1155                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1156                         start = (unsigned short *)vc->vc_pos;
1157                         break;
1158                 case 1: /* erase from start to cursor */
1159                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1160                         start = (unsigned short *)vc->vc_origin;
1161                         break;
1162                 case 3: /* erase scroll-back buffer (and whole display) */
1163                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1164                                     vc->vc_screenbuf_size >> 1);
1165                         set_origin(vc);
1166                         /* fall through */
1167                 case 2: /* erase whole display */
1168                         count = vc->vc_cols * vc->vc_rows;
1169                         start = (unsigned short *)vc->vc_origin;
1170                         break;
1171                 default:
1172                         return;
1173         }
1174         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1175         if (DO_UPDATE(vc))
1176                 do_update_region(vc, (unsigned long) start, count);
1177         vc->vc_need_wrap = 0;
1178 }
1179
1180 static void csi_K(struct vc_data *vc, int vpar)
1181 {
1182         unsigned int count;
1183         unsigned short * start;
1184
1185         switch (vpar) {
1186                 case 0: /* erase from cursor to end of line */
1187                         count = vc->vc_cols - vc->vc_x;
1188                         start = (unsigned short *)vc->vc_pos;
1189                         break;
1190                 case 1: /* erase from start of line to cursor */
1191                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1192                         count = vc->vc_x + 1;
1193                         break;
1194                 case 2: /* erase whole line */
1195                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1196                         count = vc->vc_cols;
1197                         break;
1198                 default:
1199                         return;
1200         }
1201         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1202         vc->vc_need_wrap = 0;
1203         if (DO_UPDATE(vc))
1204                 do_update_region(vc, (unsigned long) start, count);
1205 }
1206
1207 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1208 {                                         /* not vt100? */
1209         int count;
1210
1211         if (!vpar)
1212                 vpar++;
1213         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1214
1215         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1216         if (DO_UPDATE(vc))
1217                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1218         vc->vc_need_wrap = 0;
1219 }
1220
1221 static void default_attr(struct vc_data *vc)
1222 {
1223         vc->vc_intensity = 1;
1224         vc->vc_italic = 0;
1225         vc->vc_underline = 0;
1226         vc->vc_reverse = 0;
1227         vc->vc_blink = 0;
1228         vc->vc_color = vc->vc_def_color;
1229 }
1230
1231 /* console_lock is held */
1232 static void csi_m(struct vc_data *vc)
1233 {
1234         int i;
1235
1236         for (i = 0; i <= vc->vc_npar; i++)
1237                 switch (vc->vc_par[i]) {
1238                         case 0: /* all attributes off */
1239                                 default_attr(vc);
1240                                 break;
1241                         case 1:
1242                                 vc->vc_intensity = 2;
1243                                 break;
1244                         case 2:
1245                                 vc->vc_intensity = 0;
1246                                 break;
1247                         case 3:
1248                                 vc->vc_italic = 1;
1249                                 break;
1250                         case 4:
1251                                 vc->vc_underline = 1;
1252                                 break;
1253                         case 5:
1254                                 vc->vc_blink = 1;
1255                                 break;
1256                         case 7:
1257                                 vc->vc_reverse = 1;
1258                                 break;
1259                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1260                                   * Select primary font, don't display
1261                                   * control chars if defined, don't set
1262                                   * bit 8 on output.
1263                                   */
1264                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1265                                                 ? vc->vc_G0_charset
1266                                                 : vc->vc_G1_charset, vc);
1267                                 vc->vc_disp_ctrl = 0;
1268                                 vc->vc_toggle_meta = 0;
1269                                 break;
1270                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1271                                   * Select first alternate font, lets
1272                                   * chars < 32 be displayed as ROM chars.
1273                                   */
1274                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1275                                 vc->vc_disp_ctrl = 1;
1276                                 vc->vc_toggle_meta = 0;
1277                                 break;
1278                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1279                                   * Select second alternate font, toggle
1280                                   * high bit before displaying as ROM char.
1281                                   */
1282                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1283                                 vc->vc_disp_ctrl = 1;
1284                                 vc->vc_toggle_meta = 1;
1285                                 break;
1286                         case 21:
1287                         case 22:
1288                                 vc->vc_intensity = 1;
1289                                 break;
1290                         case 23:
1291                                 vc->vc_italic = 0;
1292                                 break;
1293                         case 24:
1294                                 vc->vc_underline = 0;
1295                                 break;
1296                         case 25:
1297                                 vc->vc_blink = 0;
1298                                 break;
1299                         case 27:
1300                                 vc->vc_reverse = 0;
1301                                 break;
1302                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1303                                   * Enables underscore, white foreground
1304                                   * with white underscore (Linux - use
1305                                   * default foreground).
1306                                   */
1307                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1308                                 vc->vc_underline = 1;
1309                                 break;
1310                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1311                                   * Disable underline option.
1312                                   * Reset colour to default? It did this
1313                                   * before...
1314                                   */
1315                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1316                                 vc->vc_underline = 0;
1317                                 break;
1318                         case 49:
1319                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1320                                 break;
1321                         default:
1322                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1323                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1324                                                 | (vc->vc_color & 0xf0);
1325                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1326                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1327                                                 | (vc->vc_color & 0x0f);
1328                                 break;
1329                 }
1330         update_attr(vc);
1331 }
1332
1333 static void respond_string(const char *p, struct tty_struct *tty)
1334 {
1335         while (*p) {
1336                 tty_insert_flip_char(tty, *p, 0);
1337                 p++;
1338         }
1339         tty_schedule_flip(tty);
1340 }
1341
1342 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1343 {
1344         char buf[40];
1345
1346         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1347         respond_string(buf, tty);
1348 }
1349
1350 static inline void status_report(struct tty_struct *tty)
1351 {
1352         respond_string("\033[0n", tty); /* Terminal ok */
1353 }
1354
1355 static inline void respond_ID(struct tty_struct * tty)
1356 {
1357         respond_string(VT102ID, tty);
1358 }
1359
1360 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1361 {
1362         char buf[8];
1363
1364         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1365                 (char)('!' + mry));
1366         respond_string(buf, tty);
1367 }
1368
1369 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1370 int mouse_reporting(void)
1371 {
1372         return vc_cons[fg_console].d->vc_report_mouse;
1373 }
1374
1375 /* console_lock is held */
1376 static void set_mode(struct vc_data *vc, int on_off)
1377 {
1378         int i;
1379
1380         for (i = 0; i <= vc->vc_npar; i++)
1381                 if (vc->vc_ques) {
1382                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1383                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1384                                 if (on_off)
1385                                         set_kbd(vc, decckm);
1386                                 else
1387                                         clr_kbd(vc, decckm);
1388                                 break;
1389                         case 3: /* 80/132 mode switch unimplemented */
1390                                 vc->vc_deccolm = on_off;
1391 #if 0
1392                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1393                                 /* this alone does not suffice; some user mode
1394                                    utility has to change the hardware regs */
1395 #endif
1396                                 break;
1397                         case 5:                 /* Inverted screen on/off */
1398                                 if (vc->vc_decscnm != on_off) {
1399                                         vc->vc_decscnm = on_off;
1400                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1401                                         update_attr(vc);
1402                                 }
1403                                 break;
1404                         case 6:                 /* Origin relative/absolute */
1405                                 vc->vc_decom = on_off;
1406                                 gotoxay(vc, 0, 0);
1407                                 break;
1408                         case 7:                 /* Autowrap on/off */
1409                                 vc->vc_decawm = on_off;
1410                                 break;
1411                         case 8:                 /* Autorepeat on/off */
1412                                 if (on_off)
1413                                         set_kbd(vc, decarm);
1414                                 else
1415                                         clr_kbd(vc, decarm);
1416                                 break;
1417                         case 9:
1418                                 vc->vc_report_mouse = on_off ? 1 : 0;
1419                                 break;
1420                         case 25:                /* Cursor on/off */
1421                                 vc->vc_deccm = on_off;
1422                                 break;
1423                         case 1000:
1424                                 vc->vc_report_mouse = on_off ? 2 : 0;
1425                                 break;
1426                         }
1427                 } else {
1428                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1429                         case 3:                 /* Monitor (display ctrls) */
1430                                 vc->vc_disp_ctrl = on_off;
1431                                 break;
1432                         case 4:                 /* Insert Mode on/off */
1433                                 vc->vc_decim = on_off;
1434                                 break;
1435                         case 20:                /* Lf, Enter == CrLf/Lf */
1436                                 if (on_off)
1437                                         set_kbd(vc, lnm);
1438                                 else
1439                                         clr_kbd(vc, lnm);
1440                                 break;
1441                         }
1442                 }
1443 }
1444
1445 /* console_lock is held */
1446 static void setterm_command(struct vc_data *vc)
1447 {
1448         switch(vc->vc_par[0]) {
1449                 case 1: /* set color for underline mode */
1450                         if (vc->vc_can_do_color &&
1451                                         vc->vc_par[1] < 16) {
1452                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1453                                 if (vc->vc_underline)
1454                                         update_attr(vc);
1455                         }
1456                         break;
1457                 case 2: /* set color for half intensity mode */
1458                         if (vc->vc_can_do_color &&
1459                                         vc->vc_par[1] < 16) {
1460                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1461                                 if (vc->vc_intensity == 0)
1462                                         update_attr(vc);
1463                         }
1464                         break;
1465                 case 8: /* store colors as defaults */
1466                         vc->vc_def_color = vc->vc_attr;
1467                         if (vc->vc_hi_font_mask == 0x100)
1468                                 vc->vc_def_color >>= 1;
1469                         default_attr(vc);
1470                         update_attr(vc);
1471                         break;
1472                 case 9: /* set blanking interval */
1473                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1474                         poke_blanked_console();
1475                         break;
1476                 case 10: /* set bell frequency in Hz */
1477                         if (vc->vc_npar >= 1)
1478                                 vc->vc_bell_pitch = vc->vc_par[1];
1479                         else
1480                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1481                         break;
1482                 case 11: /* set bell duration in msec */
1483                         if (vc->vc_npar >= 1)
1484                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1485                                         vc->vc_par[1] * HZ / 1000 : 0;
1486                         else
1487                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1488                         break;
1489                 case 12: /* bring specified console to the front */
1490                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1491                                 set_console(vc->vc_par[1] - 1);
1492                         break;
1493                 case 13: /* unblank the screen */
1494                         poke_blanked_console();
1495                         break;
1496                 case 14: /* set vesa powerdown interval */
1497                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1498                         break;
1499                 case 15: /* activate the previous console */
1500                         set_console(last_console);
1501                         break;
1502         }
1503 }
1504
1505 /* console_lock is held */
1506 static void csi_at(struct vc_data *vc, unsigned int nr)
1507 {
1508         if (nr > vc->vc_cols - vc->vc_x)
1509                 nr = vc->vc_cols - vc->vc_x;
1510         else if (!nr)
1511                 nr = 1;
1512         insert_char(vc, nr);
1513 }
1514
1515 /* console_lock is held */
1516 static void csi_L(struct vc_data *vc, unsigned int nr)
1517 {
1518         if (nr > vc->vc_rows - vc->vc_y)
1519                 nr = vc->vc_rows - vc->vc_y;
1520         else if (!nr)
1521                 nr = 1;
1522         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1523         vc->vc_need_wrap = 0;
1524 }
1525
1526 /* console_lock is held */
1527 static void csi_P(struct vc_data *vc, unsigned int nr)
1528 {
1529         if (nr > vc->vc_cols - vc->vc_x)
1530                 nr = vc->vc_cols - vc->vc_x;
1531         else if (!nr)
1532                 nr = 1;
1533         delete_char(vc, nr);
1534 }
1535
1536 /* console_lock is held */
1537 static void csi_M(struct vc_data *vc, unsigned int nr)
1538 {
1539         if (nr > vc->vc_rows - vc->vc_y)
1540                 nr = vc->vc_rows - vc->vc_y;
1541         else if (!nr)
1542                 nr=1;
1543         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1544         vc->vc_need_wrap = 0;
1545 }
1546
1547 /* console_lock is held (except via vc_init->reset_terminal */
1548 static void save_cur(struct vc_data *vc)
1549 {
1550         vc->vc_saved_x          = vc->vc_x;
1551         vc->vc_saved_y          = vc->vc_y;
1552         vc->vc_s_intensity      = vc->vc_intensity;
1553         vc->vc_s_italic         = vc->vc_italic;
1554         vc->vc_s_underline      = vc->vc_underline;
1555         vc->vc_s_blink          = vc->vc_blink;
1556         vc->vc_s_reverse        = vc->vc_reverse;
1557         vc->vc_s_charset        = vc->vc_charset;
1558         vc->vc_s_color          = vc->vc_color;
1559         vc->vc_saved_G0         = vc->vc_G0_charset;
1560         vc->vc_saved_G1         = vc->vc_G1_charset;
1561 }
1562
1563 /* console_lock is held */
1564 static void restore_cur(struct vc_data *vc)
1565 {
1566         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1567         vc->vc_intensity        = vc->vc_s_intensity;
1568         vc->vc_italic           = vc->vc_s_italic;
1569         vc->vc_underline        = vc->vc_s_underline;
1570         vc->vc_blink            = vc->vc_s_blink;
1571         vc->vc_reverse          = vc->vc_s_reverse;
1572         vc->vc_charset          = vc->vc_s_charset;
1573         vc->vc_color            = vc->vc_s_color;
1574         vc->vc_G0_charset       = vc->vc_saved_G0;
1575         vc->vc_G1_charset       = vc->vc_saved_G1;
1576         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1577         update_attr(vc);
1578         vc->vc_need_wrap = 0;
1579 }
1580
1581 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1582         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1583         ESpalette };
1584
1585 /* console_lock is held (except via vc_init()) */
1586 static void reset_terminal(struct vc_data *vc, int do_clear)
1587 {
1588         vc->vc_top              = 0;
1589         vc->vc_bottom           = vc->vc_rows;
1590         vc->vc_state            = ESnormal;
1591         vc->vc_ques             = 0;
1592         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1593         vc->vc_G0_charset       = LAT1_MAP;
1594         vc->vc_G1_charset       = GRAF_MAP;
1595         vc->vc_charset          = 0;
1596         vc->vc_need_wrap        = 0;
1597         vc->vc_report_mouse     = 0;
1598         vc->vc_utf              = default_utf8;
1599         vc->vc_utf_count        = 0;
1600
1601         vc->vc_disp_ctrl        = 0;
1602         vc->vc_toggle_meta      = 0;
1603
1604         vc->vc_decscnm          = 0;
1605         vc->vc_decom            = 0;
1606         vc->vc_decawm           = 1;
1607         vc->vc_deccm            = global_cursor_default;
1608         vc->vc_decim            = 0;
1609
1610         vt_reset_keyboard(vc->vc_num);
1611
1612         vc->vc_cursor_type = cur_default;
1613         vc->vc_complement_mask = vc->vc_s_complement_mask;
1614
1615         default_attr(vc);
1616         update_attr(vc);
1617
1618         vc->vc_tab_stop[0]      = 0x01010100;
1619         vc->vc_tab_stop[1]      =
1620         vc->vc_tab_stop[2]      =
1621         vc->vc_tab_stop[3]      =
1622         vc->vc_tab_stop[4]      =
1623         vc->vc_tab_stop[5]      =
1624         vc->vc_tab_stop[6]      =
1625         vc->vc_tab_stop[7]      = 0x01010101;
1626
1627         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1628         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1629
1630         gotoxy(vc, 0, 0);
1631         save_cur(vc);
1632         if (do_clear)
1633             csi_J(vc, 2);
1634 }
1635
1636 /* console_lock is held */
1637 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1638 {
1639         /*
1640          *  Control characters can be used in the _middle_
1641          *  of an escape sequence.
1642          */
1643         switch (c) {
1644         case 0:
1645                 return;
1646         case 7:
1647                 if (vc->vc_bell_duration)
1648                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1649                 return;
1650         case 8:
1651                 bs(vc);
1652                 return;
1653         case 9:
1654                 vc->vc_pos -= (vc->vc_x << 1);
1655                 while (vc->vc_x < vc->vc_cols - 1) {
1656                         vc->vc_x++;
1657                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1658                                 break;
1659                 }
1660                 vc->vc_pos += (vc->vc_x << 1);
1661                 notify_write(vc, '\t');
1662                 return;
1663         case 10: case 11: case 12:
1664                 lf(vc);
1665                 if (!is_kbd(vc, lnm))
1666                         return;
1667         case 13:
1668                 cr(vc);
1669                 return;
1670         case 14:
1671                 vc->vc_charset = 1;
1672                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1673                 vc->vc_disp_ctrl = 1;
1674                 return;
1675         case 15:
1676                 vc->vc_charset = 0;
1677                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1678                 vc->vc_disp_ctrl = 0;
1679                 return;
1680         case 24: case 26:
1681                 vc->vc_state = ESnormal;
1682                 return;
1683         case 27:
1684                 vc->vc_state = ESesc;
1685                 return;
1686         case 127:
1687                 del(vc);
1688                 return;
1689         case 128+27:
1690                 vc->vc_state = ESsquare;
1691                 return;
1692         }
1693         switch(vc->vc_state) {
1694         case ESesc:
1695                 vc->vc_state = ESnormal;
1696                 switch (c) {
1697                 case '[':
1698                         vc->vc_state = ESsquare;
1699                         return;
1700                 case ']':
1701                         vc->vc_state = ESnonstd;
1702                         return;
1703                 case '%':
1704                         vc->vc_state = ESpercent;
1705                         return;
1706                 case 'E':
1707                         cr(vc);
1708                         lf(vc);
1709                         return;
1710                 case 'M':
1711                         ri(vc);
1712                         return;
1713                 case 'D':
1714                         lf(vc);
1715                         return;
1716                 case 'H':
1717                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1718                         return;
1719                 case 'Z':
1720                         respond_ID(tty);
1721                         return;
1722                 case '7':
1723                         save_cur(vc);
1724                         return;
1725                 case '8':
1726                         restore_cur(vc);
1727                         return;
1728                 case '(':
1729                         vc->vc_state = ESsetG0;
1730                         return;
1731                 case ')':
1732                         vc->vc_state = ESsetG1;
1733                         return;
1734                 case '#':
1735                         vc->vc_state = EShash;
1736                         return;
1737                 case 'c':
1738                         reset_terminal(vc, 1);
1739                         return;
1740                 case '>':  /* Numeric keypad */
1741                         clr_kbd(vc, kbdapplic);
1742                         return;
1743                 case '=':  /* Appl. keypad */
1744                         set_kbd(vc, kbdapplic);
1745                         return;
1746                 }
1747                 return;
1748         case ESnonstd:
1749                 if (c=='P') {   /* palette escape sequence */
1750                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1751                                 vc->vc_par[vc->vc_npar] = 0;
1752                         vc->vc_npar = 0;
1753                         vc->vc_state = ESpalette;
1754                         return;
1755                 } else if (c=='R') {   /* reset palette */
1756                         reset_palette(vc);
1757                         vc->vc_state = ESnormal;
1758                 } else
1759                         vc->vc_state = ESnormal;
1760                 return;
1761         case ESpalette:
1762                 if (isxdigit(c)) {
1763                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1764                         if (vc->vc_npar == 7) {
1765                                 int i = vc->vc_par[0] * 3, j = 1;
1766                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1767                                 vc->vc_palette[i++] += vc->vc_par[j++];
1768                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1769                                 vc->vc_palette[i++] += vc->vc_par[j++];
1770                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1771                                 vc->vc_palette[i] += vc->vc_par[j];
1772                                 set_palette(vc);
1773                                 vc->vc_state = ESnormal;
1774                         }
1775                 } else
1776                         vc->vc_state = ESnormal;
1777                 return;
1778         case ESsquare:
1779                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1780                         vc->vc_par[vc->vc_npar] = 0;
1781                 vc->vc_npar = 0;
1782                 vc->vc_state = ESgetpars;
1783                 if (c == '[') { /* Function key */
1784                         vc->vc_state=ESfunckey;
1785                         return;
1786                 }
1787                 vc->vc_ques = (c == '?');
1788                 if (vc->vc_ques)
1789                         return;
1790         case ESgetpars:
1791                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1792                         vc->vc_npar++;
1793                         return;
1794                 } else if (c>='0' && c<='9') {
1795                         vc->vc_par[vc->vc_npar] *= 10;
1796                         vc->vc_par[vc->vc_npar] += c - '0';
1797                         return;
1798                 } else
1799                         vc->vc_state = ESgotpars;
1800         case ESgotpars:
1801                 vc->vc_state = ESnormal;
1802                 switch(c) {
1803                 case 'h':
1804                         set_mode(vc, 1);
1805                         return;
1806                 case 'l':
1807                         set_mode(vc, 0);
1808                         return;
1809                 case 'c':
1810                         if (vc->vc_ques) {
1811                                 if (vc->vc_par[0])
1812                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1813                                 else
1814                                         vc->vc_cursor_type = cur_default;
1815                                 return;
1816                         }
1817                         break;
1818                 case 'm':
1819                         if (vc->vc_ques) {
1820                                 clear_selection();
1821                                 if (vc->vc_par[0])
1822                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1823                                 else
1824                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1825                                 return;
1826                         }
1827                         break;
1828                 case 'n':
1829                         if (!vc->vc_ques) {
1830                                 if (vc->vc_par[0] == 5)
1831                                         status_report(tty);
1832                                 else if (vc->vc_par[0] == 6)
1833                                         cursor_report(vc, tty);
1834                         }
1835                         return;
1836                 }
1837                 if (vc->vc_ques) {
1838                         vc->vc_ques = 0;
1839                         return;
1840                 }
1841                 switch(c) {
1842                 case 'G': case '`':
1843                         if (vc->vc_par[0])
1844                                 vc->vc_par[0]--;
1845                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1846                         return;
1847                 case 'A':
1848                         if (!vc->vc_par[0])
1849                                 vc->vc_par[0]++;
1850                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1851                         return;
1852                 case 'B': case 'e':
1853                         if (!vc->vc_par[0])
1854                                 vc->vc_par[0]++;
1855                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1856                         return;
1857                 case 'C': case 'a':
1858                         if (!vc->vc_par[0])
1859                                 vc->vc_par[0]++;
1860                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1861                         return;
1862                 case 'D':
1863                         if (!vc->vc_par[0])
1864                                 vc->vc_par[0]++;
1865                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1866                         return;
1867                 case 'E':
1868                         if (!vc->vc_par[0])
1869                                 vc->vc_par[0]++;
1870                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1871                         return;
1872                 case 'F':
1873                         if (!vc->vc_par[0])
1874                                 vc->vc_par[0]++;
1875                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1876                         return;
1877                 case 'd':
1878                         if (vc->vc_par[0])
1879                                 vc->vc_par[0]--;
1880                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1881                         return;
1882                 case 'H': case 'f':
1883                         if (vc->vc_par[0])
1884                                 vc->vc_par[0]--;
1885                         if (vc->vc_par[1])
1886                                 vc->vc_par[1]--;
1887                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1888                         return;
1889                 case 'J':
1890                         csi_J(vc, vc->vc_par[0]);
1891                         return;
1892                 case 'K':
1893                         csi_K(vc, vc->vc_par[0]);
1894                         return;
1895                 case 'L':
1896                         csi_L(vc, vc->vc_par[0]);
1897                         return;
1898                 case 'M':
1899                         csi_M(vc, vc->vc_par[0]);
1900                         return;
1901                 case 'P':
1902                         csi_P(vc, vc->vc_par[0]);
1903                         return;
1904                 case 'c':
1905                         if (!vc->vc_par[0])
1906                                 respond_ID(tty);
1907                         return;
1908                 case 'g':
1909                         if (!vc->vc_par[0])
1910                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1911                         else if (vc->vc_par[0] == 3) {
1912                                 vc->vc_tab_stop[0] =
1913                                         vc->vc_tab_stop[1] =
1914                                         vc->vc_tab_stop[2] =
1915                                         vc->vc_tab_stop[3] =
1916                                         vc->vc_tab_stop[4] =
1917                                         vc->vc_tab_stop[5] =
1918                                         vc->vc_tab_stop[6] =
1919                                         vc->vc_tab_stop[7] = 0;
1920                         }
1921                         return;
1922                 case 'm':
1923                         csi_m(vc);
1924                         return;
1925                 case 'q': /* DECLL - but only 3 leds */
1926                         /* map 0,1,2,3 to 0,1,2,4 */
1927                         if (vc->vc_par[0] < 4)
1928                                 vt_set_led_state(vc->vc_num,
1929                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1930                         return;
1931                 case 'r':
1932                         if (!vc->vc_par[0])
1933                                 vc->vc_par[0]++;
1934                         if (!vc->vc_par[1])
1935                                 vc->vc_par[1] = vc->vc_rows;
1936                         /* Minimum allowed region is 2 lines */
1937                         if (vc->vc_par[0] < vc->vc_par[1] &&
1938                             vc->vc_par[1] <= vc->vc_rows) {
1939                                 vc->vc_top = vc->vc_par[0] - 1;
1940                                 vc->vc_bottom = vc->vc_par[1];
1941                                 gotoxay(vc, 0, 0);
1942                         }
1943                         return;
1944                 case 's':
1945                         save_cur(vc);
1946                         return;
1947                 case 'u':
1948                         restore_cur(vc);
1949                         return;
1950                 case 'X':
1951                         csi_X(vc, vc->vc_par[0]);
1952                         return;
1953                 case '@':
1954                         csi_at(vc, vc->vc_par[0]);
1955                         return;
1956                 case ']': /* setterm functions */
1957                         setterm_command(vc);
1958                         return;
1959                 }
1960                 return;
1961         case ESpercent:
1962                 vc->vc_state = ESnormal;
1963                 switch (c) {
1964                 case '@':  /* defined in ISO 2022 */
1965                         vc->vc_utf = 0;
1966                         return;
1967                 case 'G':  /* prelim official escape code */
1968                 case '8':  /* retained for compatibility */
1969                         vc->vc_utf = 1;
1970                         return;
1971                 }
1972                 return;
1973         case ESfunckey:
1974                 vc->vc_state = ESnormal;
1975                 return;
1976         case EShash:
1977                 vc->vc_state = ESnormal;
1978                 if (c == '8') {
1979                         /* DEC screen alignment test. kludge :-) */
1980                         vc->vc_video_erase_char =
1981                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1982                         csi_J(vc, 2);
1983                         vc->vc_video_erase_char =
1984                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1985                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1986                 }
1987                 return;
1988         case ESsetG0:
1989                 if (c == '0')
1990                         vc->vc_G0_charset = GRAF_MAP;
1991                 else if (c == 'B')
1992                         vc->vc_G0_charset = LAT1_MAP;
1993                 else if (c == 'U')
1994                         vc->vc_G0_charset = IBMPC_MAP;
1995                 else if (c == 'K')
1996                         vc->vc_G0_charset = USER_MAP;
1997                 if (vc->vc_charset == 0)
1998                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1999                 vc->vc_state = ESnormal;
2000                 return;
2001         case ESsetG1:
2002                 if (c == '0')
2003                         vc->vc_G1_charset = GRAF_MAP;
2004                 else if (c == 'B')
2005                         vc->vc_G1_charset = LAT1_MAP;
2006                 else if (c == 'U')
2007                         vc->vc_G1_charset = IBMPC_MAP;
2008                 else if (c == 'K')
2009                         vc->vc_G1_charset = USER_MAP;
2010                 if (vc->vc_charset == 1)
2011                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2012                 vc->vc_state = ESnormal;
2013                 return;
2014         default:
2015                 vc->vc_state = ESnormal;
2016         }
2017 }
2018
2019 /* is_double_width() is based on the wcwidth() implementation by
2020  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2021  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2022  */
2023 struct interval {
2024         uint32_t first;
2025         uint32_t last;
2026 };
2027
2028 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2029 {
2030         int min = 0;
2031         int mid;
2032
2033         if (ucs < table[0].first || ucs > table[max].last)
2034                 return 0;
2035         while (max >= min) {
2036                 mid = (min + max) / 2;
2037                 if (ucs > table[mid].last)
2038                         min = mid + 1;
2039                 else if (ucs < table[mid].first)
2040                         max = mid - 1;
2041                 else
2042                         return 1;
2043         }
2044         return 0;
2045 }
2046
2047 static int is_double_width(uint32_t ucs)
2048 {
2049         static const struct interval double_width[] = {
2050                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2051                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2052                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2053                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2054         };
2055         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2056 }
2057
2058 /* acquires console_lock */
2059 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2060 {
2061 #ifdef VT_BUF_VRAM_ONLY
2062 #define FLUSH do { } while(0);
2063 #else
2064 #define FLUSH if (draw_x >= 0) { \
2065         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2066         draw_x = -1; \
2067         }
2068 #endif
2069
2070         int c, tc, ok, n = 0, draw_x = -1;
2071         unsigned int currcons;
2072         unsigned long draw_from = 0, draw_to = 0;
2073         struct vc_data *vc;
2074         unsigned char vc_attr;
2075         struct vt_notifier_param param;
2076         uint8_t rescan;
2077         uint8_t inverse;
2078         uint8_t width;
2079         u16 himask, charmask;
2080
2081         if (in_interrupt())
2082                 return count;
2083
2084         might_sleep();
2085
2086         console_lock();
2087         vc = tty->driver_data;
2088         if (vc == NULL) {
2089                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2090                 console_unlock();
2091                 return 0;
2092         }
2093
2094         currcons = vc->vc_num;
2095         if (!vc_cons_allocated(currcons)) {
2096                 /* could this happen? */
2097                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2098                 console_unlock();
2099                 return 0;
2100         }
2101
2102         himask = vc->vc_hi_font_mask;
2103         charmask = himask ? 0x1ff : 0xff;
2104
2105         /* undraw cursor first */
2106         if (IS_FG(vc))
2107                 hide_cursor(vc);
2108
2109         param.vc = vc;
2110
2111         while (!tty->stopped && count) {
2112                 int orig = *buf;
2113                 c = orig;
2114                 buf++;
2115                 n++;
2116                 count--;
2117                 rescan = 0;
2118                 inverse = 0;
2119                 width = 1;
2120
2121                 /* Do no translation at all in control states */
2122                 if (vc->vc_state != ESnormal) {
2123                         tc = c;
2124                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2125                     /* Combine UTF-8 into Unicode in vc_utf_char.
2126                      * vc_utf_count is the number of continuation bytes still
2127                      * expected to arrive.
2128                      * vc_npar is the number of continuation bytes arrived so
2129                      * far
2130                      */
2131 rescan_last_byte:
2132                     if ((c & 0xc0) == 0x80) {
2133                         /* Continuation byte received */
2134                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2135                         if (vc->vc_utf_count) {
2136                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2137                             vc->vc_npar++;
2138                             if (--vc->vc_utf_count) {
2139                                 /* Still need some bytes */
2140                                 continue;
2141                             }
2142                             /* Got a whole character */
2143                             c = vc->vc_utf_char;
2144                             /* Reject overlong sequences */
2145                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2146                                         c > utf8_length_changes[vc->vc_npar])
2147                                 c = 0xfffd;
2148                         } else {
2149                             /* Unexpected continuation byte */
2150                             vc->vc_utf_count = 0;
2151                             c = 0xfffd;
2152                         }
2153                     } else {
2154                         /* Single ASCII byte or first byte of a sequence received */
2155                         if (vc->vc_utf_count) {
2156                             /* Continuation byte expected */
2157                             rescan = 1;
2158                             vc->vc_utf_count = 0;
2159                             c = 0xfffd;
2160                         } else if (c > 0x7f) {
2161                             /* First byte of a multibyte sequence received */
2162                             vc->vc_npar = 0;
2163                             if ((c & 0xe0) == 0xc0) {
2164                                 vc->vc_utf_count = 1;
2165                                 vc->vc_utf_char = (c & 0x1f);
2166                             } else if ((c & 0xf0) == 0xe0) {
2167                                 vc->vc_utf_count = 2;
2168                                 vc->vc_utf_char = (c & 0x0f);
2169                             } else if ((c & 0xf8) == 0xf0) {
2170                                 vc->vc_utf_count = 3;
2171                                 vc->vc_utf_char = (c & 0x07);
2172                             } else if ((c & 0xfc) == 0xf8) {
2173                                 vc->vc_utf_count = 4;
2174                                 vc->vc_utf_char = (c & 0x03);
2175                             } else if ((c & 0xfe) == 0xfc) {
2176                                 vc->vc_utf_count = 5;
2177                                 vc->vc_utf_char = (c & 0x01);
2178                             } else {
2179                                 /* 254 and 255 are invalid */
2180                                 c = 0xfffd;
2181                             }
2182                             if (vc->vc_utf_count) {
2183                                 /* Still need some bytes */
2184                                 continue;
2185                             }
2186                         }
2187                         /* Nothing to do if an ASCII byte was received */
2188                     }
2189                     /* End of UTF-8 decoding. */
2190                     /* c is the received character, or U+FFFD for invalid sequences. */
2191                     /* Replace invalid Unicode code points with U+FFFD too */
2192                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2193                         c = 0xfffd;
2194                     tc = c;
2195                 } else {        /* no utf or alternate charset mode */
2196                     tc = vc_translate(vc, c);
2197                 }
2198
2199                 param.c = tc;
2200                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2201                                         &param) == NOTIFY_STOP)
2202                         continue;
2203
2204                 /* If the original code was a control character we
2205                  * only allow a glyph to be displayed if the code is
2206                  * not normally used (such as for cursor movement) or
2207                  * if the disp_ctrl mode has been explicitly enabled.
2208                  * Certain characters (as given by the CTRL_ALWAYS
2209                  * bitmap) are always displayed as control characters,
2210                  * as the console would be pretty useless without
2211                  * them; to display an arbitrary font position use the
2212                  * direct-to-font zone in UTF-8 mode.
2213                  */
2214                 ok = tc && (c >= 32 ||
2215                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2216                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2217                         && (c != 127 || vc->vc_disp_ctrl)
2218                         && (c != 128+27);
2219
2220                 if (vc->vc_state == ESnormal && ok) {
2221                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2222                                 if (is_double_width(c))
2223                                         width = 2;
2224                         }
2225                         /* Now try to find out how to display it */
2226                         tc = conv_uni_to_pc(vc, tc);
2227                         if (tc & ~charmask) {
2228                                 if (tc == -1 || tc == -2) {
2229                                     continue; /* nothing to display */
2230                                 }
2231                                 /* Glyph not found */
2232                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2233                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2234                                        This would make absolutely no sense with Unicode in mind,
2235                                        but do this for ASCII characters since a font may lack
2236                                        Unicode mapping info and we don't want to end up with
2237                                        having question marks only. */
2238                                     tc = c;
2239                                 } else {
2240                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2241                                     tc = conv_uni_to_pc(vc, 0xfffd);
2242                                     if (tc < 0) {
2243                                         inverse = 1;
2244                                         tc = conv_uni_to_pc(vc, '?');
2245                                         if (tc < 0) tc = '?';
2246                                     }
2247                                 }
2248                         }
2249
2250                         if (!inverse) {
2251                                 vc_attr = vc->vc_attr;
2252                         } else {
2253                                 /* invert vc_attr */
2254                                 if (!vc->vc_can_do_color) {
2255                                         vc_attr = (vc->vc_attr) ^ 0x08;
2256                                 } else if (vc->vc_hi_font_mask == 0x100) {
2257                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2258                                 } else {
2259                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2260                                 }
2261                                 FLUSH
2262                         }
2263
2264                         while (1) {
2265                                 if (vc->vc_need_wrap || vc->vc_decim)
2266                                         FLUSH
2267                                 if (vc->vc_need_wrap) {
2268                                         cr(vc);
2269                                         lf(vc);
2270                                 }
2271                                 if (vc->vc_decim)
2272                                         insert_char(vc, 1);
2273                                 scr_writew(himask ?
2274                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2275                                              (vc_attr << 8) + tc,
2276                                            (u16 *) vc->vc_pos);
2277                                 if (DO_UPDATE(vc) && draw_x < 0) {
2278                                         draw_x = vc->vc_x;
2279                                         draw_from = vc->vc_pos;
2280                                 }
2281                                 if (vc->vc_x == vc->vc_cols - 1) {
2282                                         vc->vc_need_wrap = vc->vc_decawm;
2283                                         draw_to = vc->vc_pos + 2;
2284                                 } else {
2285                                         vc->vc_x++;
2286                                         draw_to = (vc->vc_pos += 2);
2287                                 }
2288
2289                                 if (!--width) break;
2290
2291                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2292                                 if (tc < 0) tc = ' ';
2293                         }
2294                         notify_write(vc, c);
2295
2296                         if (inverse) {
2297                                 FLUSH
2298                         }
2299
2300                         if (rescan) {
2301                                 rescan = 0;
2302                                 inverse = 0;
2303                                 width = 1;
2304                                 c = orig;
2305                                 goto rescan_last_byte;
2306                         }
2307                         continue;
2308                 }
2309                 FLUSH
2310                 do_con_trol(tty, vc, orig);
2311         }
2312         FLUSH
2313         console_conditional_schedule();
2314         console_unlock();
2315         notify_update(vc);
2316         return n;
2317 #undef FLUSH
2318 }
2319
2320 /*
2321  * This is the console switching callback.
2322  *
2323  * Doing console switching in a process context allows
2324  * us to do the switches asynchronously (needed when we want
2325  * to switch due to a keyboard interrupt).  Synchronization
2326  * with other console code and prevention of re-entrancy is
2327  * ensured with console_lock.
2328  */
2329 static void console_callback(struct work_struct *ignored)
2330 {
2331         console_lock();
2332
2333         if (want_console >= 0) {
2334                 if (want_console != fg_console &&
2335                     vc_cons_allocated(want_console)) {
2336                         hide_cursor(vc_cons[fg_console].d);
2337                         change_console(vc_cons[want_console].d);
2338                         /* we only changed when the console had already
2339                            been allocated - a new console is not created
2340                            in an interrupt routine */
2341                 }
2342                 want_console = -1;
2343         }
2344         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2345                 do_poke_blanked_console = 0;
2346                 poke_blanked_console();
2347         }
2348         if (scrollback_delta) {
2349                 struct vc_data *vc = vc_cons[fg_console].d;
2350                 clear_selection();
2351                 if (vc->vc_mode == KD_TEXT)
2352                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2353                 scrollback_delta = 0;
2354         }
2355         if (blank_timer_expired) {
2356                 do_blank_screen(0);
2357                 blank_timer_expired = 0;
2358         }
2359         notify_update(vc_cons[fg_console].d);
2360
2361         console_unlock();
2362 }
2363
2364 int set_console(int nr)
2365 {
2366         struct vc_data *vc = vc_cons[fg_console].d;
2367
2368         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2369                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2370
2371                 /*
2372                  * Console switch will fail in console_callback() or
2373                  * change_console() so there is no point scheduling
2374                  * the callback
2375                  *
2376                  * Existing set_console() users don't check the return
2377                  * value so this shouldn't break anything
2378                  */
2379                 return -EINVAL;
2380         }
2381
2382         want_console = nr;
2383         schedule_console_callback();
2384
2385         return 0;
2386 }
2387
2388 struct tty_driver *console_driver;
2389
2390 #ifdef CONFIG_VT_CONSOLE
2391
2392 /**
2393  * vt_kmsg_redirect() - Sets/gets the kernel message console
2394  * @new:        The new virtual terminal number or -1 if the console should stay
2395  *              unchanged
2396  *
2397  * By default, the kernel messages are always printed on the current virtual
2398  * console. However, the user may modify that default with the
2399  * TIOCL_SETKMSGREDIRECT ioctl call.
2400  *
2401  * This function sets the kernel message console to be @new. It returns the old
2402  * virtual console number. The virtual terminal number 0 (both as parameter and
2403  * return value) means no redirection (i.e. always printed on the currently
2404  * active console).
2405  *
2406  * The parameter -1 means that only the current console is returned, but the
2407  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2408  * case to make the code more understandable.
2409  *
2410  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2411  * the parameter and always returns 0.
2412  */
2413 int vt_kmsg_redirect(int new)
2414 {
2415         static int kmsg_con;
2416
2417         if (new != -1)
2418                 return xchg(&kmsg_con, new);
2419         else
2420                 return kmsg_con;
2421 }
2422
2423 /*
2424  *      Console on virtual terminal
2425  *
2426  * The console must be locked when we get here.
2427  */
2428
2429 static void vt_console_print(struct console *co, const char *b, unsigned count)
2430 {
2431         struct vc_data *vc = vc_cons[fg_console].d;
2432         unsigned char c;
2433         static DEFINE_SPINLOCK(printing_lock);
2434         const ushort *start;
2435         ushort cnt = 0;
2436         ushort myx;
2437         int kmsg_console;
2438
2439         /* console busy or not yet initialized */
2440         if (!printable)
2441                 return;
2442         if (!spin_trylock(&printing_lock))
2443                 return;
2444
2445         kmsg_console = vt_get_kmsg_redirect();
2446         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2447                 vc = vc_cons[kmsg_console - 1].d;
2448
2449         /* read `x' only after setting currcons properly (otherwise
2450            the `x' macro will read the x of the foreground console). */
2451         myx = vc->vc_x;
2452
2453         if (!vc_cons_allocated(fg_console)) {
2454                 /* impossible */
2455                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2456                 goto quit;
2457         }
2458
2459         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2460                 goto quit;
2461
2462         /* undraw cursor first */
2463         if (IS_FG(vc))
2464                 hide_cursor(vc);
2465
2466         start = (ushort *)vc->vc_pos;
2467
2468         /* Contrived structure to try to emulate original need_wrap behaviour
2469          * Problems caused when we have need_wrap set on '\n' character */
2470         while (count--) {
2471                 c = *b++;
2472                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2473                         if (cnt > 0) {
2474                                 if (CON_IS_VISIBLE(vc))
2475                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2476                                 vc->vc_x += cnt;
2477                                 if (vc->vc_need_wrap)
2478                                         vc->vc_x--;
2479                                 cnt = 0;
2480                         }
2481                         if (c == 8) {           /* backspace */
2482                                 bs(vc);
2483                                 start = (ushort *)vc->vc_pos;
2484                                 myx = vc->vc_x;
2485                                 continue;
2486                         }
2487                         if (c != 13)
2488                                 lf(vc);
2489                         cr(vc);
2490                         start = (ushort *)vc->vc_pos;
2491                         myx = vc->vc_x;
2492                         if (c == 10 || c == 13)
2493                                 continue;
2494                 }
2495                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2496                 notify_write(vc, c);
2497                 cnt++;
2498                 if (myx == vc->vc_cols - 1) {
2499                         vc->vc_need_wrap = 1;
2500                         continue;
2501                 }
2502                 vc->vc_pos += 2;
2503                 myx++;
2504         }
2505         if (cnt > 0) {
2506                 if (CON_IS_VISIBLE(vc))
2507                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2508                 vc->vc_x += cnt;
2509                 if (vc->vc_x == vc->vc_cols) {
2510                         vc->vc_x--;
2511                         vc->vc_need_wrap = 1;
2512                 }
2513         }
2514         set_cursor(vc);
2515         notify_update(vc);
2516
2517 quit:
2518         spin_unlock(&printing_lock);
2519 }
2520
2521 static struct tty_driver *vt_console_device(struct console *c, int *index)
2522 {
2523         *index = c->index ? c->index-1 : fg_console;
2524         return console_driver;
2525 }
2526
2527 static struct console vt_console_driver = {
2528         .name           = "tty",
2529         .write          = vt_console_print,
2530         .device         = vt_console_device,
2531         .unblank        = unblank_screen,
2532         .flags          = CON_PRINTBUFFER,
2533         .index          = -1,
2534 };
2535 #endif
2536
2537 /*
2538  *      Handling of Linux-specific VC ioctls
2539  */
2540
2541 /*
2542  * Generally a bit racy with respect to console_lock();.
2543  *
2544  * There are some functions which don't need it.
2545  *
2546  * There are some functions which can sleep for arbitrary periods
2547  * (paste_selection) but we don't need the lock there anyway.
2548  *
2549  * set_selection has locking, and definitely needs it
2550  */
2551
2552 int tioclinux(struct tty_struct *tty, unsigned long arg)
2553 {
2554         char type, data;
2555         char __user *p = (char __user *)arg;
2556         int lines;
2557         int ret;
2558
2559         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2560                 return -EPERM;
2561         if (get_user(type, p))
2562                 return -EFAULT;
2563         ret = 0;
2564
2565         switch (type)
2566         {
2567                 case TIOCL_SETSEL:
2568                         console_lock();
2569                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2570                         console_unlock();
2571                         break;
2572                 case TIOCL_PASTESEL:
2573                         ret = paste_selection(tty);
2574                         break;
2575                 case TIOCL_UNBLANKSCREEN:
2576                         console_lock();
2577                         unblank_screen();
2578                         console_unlock();
2579                         break;
2580                 case TIOCL_SELLOADLUT:
2581                         console_lock();
2582                         ret = sel_loadlut(p);
2583                         console_unlock();
2584                         break;
2585                 case TIOCL_GETSHIFTSTATE:
2586
2587         /*
2588          * Make it possible to react to Shift+Mousebutton.
2589          * Note that 'shift_state' is an undocumented
2590          * kernel-internal variable; programs not closely
2591          * related to the kernel should not use this.
2592          */
2593                         data = vt_get_shift_state();
2594                         ret = __put_user(data, p);
2595                         break;
2596                 case TIOCL_GETMOUSEREPORTING:
2597                         console_lock(); /* May be overkill */
2598                         data = mouse_reporting();
2599                         console_unlock();
2600                         ret = __put_user(data, p);
2601                         break;
2602                 case TIOCL_SETVESABLANK:
2603                         console_lock();
2604                         ret = set_vesa_blanking(p);
2605                         console_unlock();
2606                         break;
2607                 case TIOCL_GETKMSGREDIRECT:
2608                         data = vt_get_kmsg_redirect();
2609                         ret = __put_user(data, p);
2610                         break;
2611                 case TIOCL_SETKMSGREDIRECT:
2612                         if (!capable(CAP_SYS_ADMIN)) {
2613                                 ret = -EPERM;
2614                         } else {
2615                                 if (get_user(data, p+1))
2616                                         ret = -EFAULT;
2617                                 else
2618                                         vt_kmsg_redirect(data);
2619                         }
2620                         break;
2621                 case TIOCL_GETFGCONSOLE:
2622                         /* No locking needed as this is a transiently
2623                            correct return anyway if the caller hasn't
2624                            disabled switching */
2625                         ret = fg_console;
2626                         break;
2627                 case TIOCL_SCROLLCONSOLE:
2628                         if (get_user(lines, (s32 __user *)(p+4))) {
2629                                 ret = -EFAULT;
2630                         } else {
2631                                 /* Need the console lock here. Note that lots
2632                                    of other calls need fixing before the lock
2633                                    is actually useful ! */
2634                                 console_lock();
2635                                 scrollfront(vc_cons[fg_console].d, lines);
2636                                 console_unlock();
2637                                 ret = 0;
2638                         }
2639                         break;
2640                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2641                         console_lock();
2642                         ignore_poke = 1;
2643                         do_blank_screen(0);
2644                         console_unlock();
2645                         break;
2646                 case TIOCL_BLANKEDSCREEN:
2647                         ret = console_blanked;
2648                         break;
2649                 default:
2650                         ret = -EINVAL;
2651                         break;
2652         }
2653         return ret;
2654 }
2655
2656 /*
2657  * /dev/ttyN handling
2658  */
2659
2660 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2661 {
2662         int     retval;
2663
2664         retval = do_con_write(tty, buf, count);
2665         con_flush_chars(tty);
2666
2667         return retval;
2668 }
2669
2670 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2671 {
2672         if (in_interrupt())
2673                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2674         return do_con_write(tty, &ch, 1);
2675 }
2676
2677 static int con_write_room(struct tty_struct *tty)
2678 {
2679         if (tty->stopped)
2680                 return 0;
2681         return 32768;           /* No limit, really; we're not buffering */
2682 }
2683
2684 static int con_chars_in_buffer(struct tty_struct *tty)
2685 {
2686         return 0;               /* we're not buffering */
2687 }
2688
2689 /*
2690  * con_throttle and con_unthrottle are only used for
2691  * paste_selection(), which has to stuff in a large number of
2692  * characters...
2693  */
2694 static void con_throttle(struct tty_struct *tty)
2695 {
2696 }
2697
2698 static void con_unthrottle(struct tty_struct *tty)
2699 {
2700         struct vc_data *vc = tty->driver_data;
2701
2702         wake_up_interruptible(&vc->paste_wait);
2703 }
2704
2705 /*
2706  * Turn the Scroll-Lock LED on when the tty is stopped
2707  */
2708 static void con_stop(struct tty_struct *tty)
2709 {
2710         int console_num;
2711         if (!tty)
2712                 return;
2713         console_num = tty->index;
2714         if (!vc_cons_allocated(console_num))
2715                 return;
2716         vt_kbd_con_stop(console_num);
2717 }
2718
2719 /*
2720  * Turn the Scroll-Lock LED off when the console is started
2721  */
2722 static void con_start(struct tty_struct *tty)
2723 {
2724         int console_num;
2725         if (!tty)
2726                 return;
2727         console_num = tty->index;
2728         if (!vc_cons_allocated(console_num))
2729                 return;
2730         vt_kbd_con_start(console_num);
2731 }
2732
2733 static void con_flush_chars(struct tty_struct *tty)
2734 {
2735         struct vc_data *vc;
2736
2737         if (in_interrupt())     /* from flush_to_ldisc */
2738                 return;
2739
2740         /* if we race with con_close(), vt may be null */
2741         console_lock();
2742         vc = tty->driver_data;
2743         if (vc)
2744                 set_cursor(vc);
2745         console_unlock();
2746 }
2747
2748 /*
2749  * Allocate the console screen memory.
2750  */
2751 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2752 {
2753         unsigned int currcons = tty->index;
2754         struct vc_data *vc;
2755         int ret;
2756
2757         console_lock();
2758         ret = vc_allocate(currcons);
2759         if (ret)
2760                 goto unlock;
2761
2762         vc = vc_cons[currcons].d;
2763
2764         /* Still being freed */
2765         if (vc->port.tty) {
2766                 ret = -ERESTARTSYS;
2767                 goto unlock;
2768         }
2769
2770         ret = tty_port_install(&vc->port, driver, tty);
2771         if (ret)
2772                 goto unlock;
2773
2774         tty->driver_data = vc;
2775         vc->port.tty = tty;
2776
2777         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2778                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2779                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2780         }
2781         if (vc->vc_utf)
2782                 tty->termios.c_iflag |= IUTF8;
2783         else
2784                 tty->termios.c_iflag &= ~IUTF8;
2785 unlock:
2786         console_unlock();
2787         return ret;
2788 }
2789
2790 static int con_open(struct tty_struct *tty, struct file *filp)
2791 {
2792         /* everything done in install */
2793         return 0;
2794 }
2795
2796
2797 static void con_close(struct tty_struct *tty, struct file *filp)
2798 {
2799         /* Nothing to do - we defer to shutdown */
2800 }
2801
2802 static void con_shutdown(struct tty_struct *tty)
2803 {
2804         struct vc_data *vc = tty->driver_data;
2805         BUG_ON(vc == NULL);
2806         console_lock();
2807         vc->port.tty = NULL;
2808         console_unlock();
2809 }
2810
2811 static int default_italic_color    = 2; // green (ASCII)
2812 static int default_underline_color = 3; // cyan (ASCII)
2813 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2814 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2815
2816 static void vc_init(struct vc_data *vc, unsigned int rows,
2817                     unsigned int cols, int do_clear)
2818 {
2819         int j, k ;
2820
2821         vc->vc_cols = cols;
2822         vc->vc_rows = rows;
2823         vc->vc_size_row = cols << 1;
2824         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2825
2826         set_origin(vc);
2827         vc->vc_pos = vc->vc_origin;
2828         reset_vc(vc);
2829         for (j=k=0; j<16; j++) {
2830                 vc->vc_palette[k++] = default_red[j] ;
2831                 vc->vc_palette[k++] = default_grn[j] ;
2832                 vc->vc_palette[k++] = default_blu[j] ;
2833         }
2834         vc->vc_def_color       = 0x07;   /* white */
2835         vc->vc_ulcolor         = default_underline_color;
2836         vc->vc_itcolor         = default_italic_color;
2837         vc->vc_halfcolor       = 0x08;   /* grey */
2838         init_waitqueue_head(&vc->paste_wait);
2839         reset_terminal(vc, do_clear);
2840 }
2841
2842 /*
2843  * This routine initializes console interrupts, and does nothing
2844  * else. If you want the screen to clear, call tty_write with
2845  * the appropriate escape-sequence.
2846  */
2847
2848 static int __init con_init(void)
2849 {
2850         const char *display_desc = NULL;
2851         struct vc_data *vc;
2852         unsigned int currcons = 0, i;
2853
2854         console_lock();
2855
2856         if (conswitchp)
2857                 display_desc = conswitchp->con_startup();
2858         if (!display_desc) {
2859                 fg_console = 0;
2860                 console_unlock();
2861                 return 0;
2862         }
2863
2864         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2865                 struct con_driver *con_driver = &registered_con_driver[i];
2866
2867                 if (con_driver->con == NULL) {
2868                         con_driver->con = conswitchp;
2869                         con_driver->desc = display_desc;
2870                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2871                         con_driver->first = 0;
2872                         con_driver->last = MAX_NR_CONSOLES - 1;
2873                         break;
2874                 }
2875         }
2876
2877         for (i = 0; i < MAX_NR_CONSOLES; i++)
2878                 con_driver_map[i] = conswitchp;
2879
2880         if (blankinterval) {
2881                 blank_state = blank_normal_wait;
2882                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2883         }
2884
2885         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2886                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2887                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2888                 tty_port_init(&vc->port);
2889                 visual_init(vc, currcons, 1);
2890                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2891                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2892                         currcons || !vc->vc_sw->con_save_screen);
2893         }
2894         currcons = fg_console = 0;
2895         master_display_fg = vc = vc_cons[currcons].d;
2896         set_origin(vc);
2897         save_screen(vc);
2898         gotoxy(vc, vc->vc_x, vc->vc_y);
2899         csi_J(vc, 0);
2900         update_screen(vc);
2901         pr_info("Console: %s %s %dx%d\n",
2902                 vc->vc_can_do_color ? "colour" : "mono",
2903                 display_desc, vc->vc_cols, vc->vc_rows);
2904         printable = 1;
2905
2906         console_unlock();
2907
2908 #ifdef CONFIG_VT_CONSOLE
2909         register_console(&vt_console_driver);
2910 #endif
2911         return 0;
2912 }
2913 console_initcall(con_init);
2914
2915 static const struct tty_operations con_ops = {
2916         .install = con_install,
2917         .open = con_open,
2918         .close = con_close,
2919         .write = con_write,
2920         .write_room = con_write_room,
2921         .put_char = con_put_char,
2922         .flush_chars = con_flush_chars,
2923         .chars_in_buffer = con_chars_in_buffer,
2924         .ioctl = vt_ioctl,
2925 #ifdef CONFIG_COMPAT
2926         .compat_ioctl = vt_compat_ioctl,
2927 #endif
2928         .stop = con_stop,
2929         .start = con_start,
2930         .throttle = con_throttle,
2931         .unthrottle = con_unthrottle,
2932         .resize = vt_resize,
2933         .shutdown = con_shutdown
2934 };
2935
2936 static struct cdev vc0_cdev;
2937
2938 static ssize_t show_tty_active(struct device *dev,
2939                                 struct device_attribute *attr, char *buf)
2940 {
2941         return sprintf(buf, "tty%d\n", fg_console + 1);
2942 }
2943 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2944
2945 int __init vty_init(const struct file_operations *console_fops)
2946 {
2947         cdev_init(&vc0_cdev, console_fops);
2948         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2949             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2950                 panic("Couldn't register /dev/tty0 driver\n");
2951         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2952         if (IS_ERR(tty0dev))
2953                 tty0dev = NULL;
2954         else
2955                 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2956
2957         vcs_init();
2958
2959         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2960         if (!console_driver)
2961                 panic("Couldn't allocate console driver\n");
2962
2963         console_driver->name = "tty";
2964         console_driver->name_base = 1;
2965         console_driver->major = TTY_MAJOR;
2966         console_driver->minor_start = 1;
2967         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2968         console_driver->init_termios = tty_std_termios;
2969         if (default_utf8)
2970                 console_driver->init_termios.c_iflag |= IUTF8;
2971         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2972         tty_set_operations(console_driver, &con_ops);
2973         if (tty_register_driver(console_driver))
2974                 panic("Couldn't register console driver\n");
2975         kbd_init();
2976         console_map_init();
2977 #ifdef CONFIG_MDA_CONSOLE
2978         mda_console_init();
2979 #endif
2980         return 0;
2981 }
2982
2983 #ifndef VT_SINGLE_DRIVER
2984
2985 static struct class *vtconsole_class;
2986
2987 static int bind_con_driver(const struct consw *csw, int first, int last,
2988                            int deflt)
2989 {
2990         struct module *owner = csw->owner;
2991         const char *desc = NULL;
2992         struct con_driver *con_driver;
2993         int i, j = -1, k = -1, retval = -ENODEV;
2994
2995         if (!try_module_get(owner))
2996                 return -ENODEV;
2997
2998         console_lock();
2999
3000         /* check if driver is registered */
3001         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3002                 con_driver = &registered_con_driver[i];
3003
3004                 if (con_driver->con == csw) {
3005                         desc = con_driver->desc;
3006                         retval = 0;
3007                         break;
3008                 }
3009         }
3010
3011         if (retval)
3012                 goto err;
3013
3014         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3015                 csw->con_startup();
3016                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3017         }
3018
3019         if (deflt) {
3020                 if (conswitchp)
3021                         module_put(conswitchp->owner);
3022
3023                 __module_get(owner);
3024                 conswitchp = csw;
3025         }
3026
3027         first = max(first, con_driver->first);
3028         last = min(last, con_driver->last);
3029
3030         for (i = first; i <= last; i++) {
3031                 int old_was_color;
3032                 struct vc_data *vc = vc_cons[i].d;
3033
3034                 if (con_driver_map[i])
3035                         module_put(con_driver_map[i]->owner);
3036                 __module_get(owner);
3037                 con_driver_map[i] = csw;
3038
3039                 if (!vc || !vc->vc_sw)
3040                         continue;
3041
3042                 j = i;
3043
3044                 if (CON_IS_VISIBLE(vc)) {
3045                         k = i;
3046                         save_screen(vc);
3047                 }
3048
3049                 old_was_color = vc->vc_can_do_color;
3050                 vc->vc_sw->con_deinit(vc);
3051                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3052                 visual_init(vc, i, 0);
3053                 set_origin(vc);
3054                 update_attr(vc);
3055
3056                 /* If the console changed between mono <-> color, then
3057                  * the attributes in the screenbuf will be wrong.  The
3058                  * following resets all attributes to something sane.
3059                  */
3060                 if (old_was_color != vc->vc_can_do_color)
3061                         clear_buffer_attributes(vc);
3062         }
3063
3064         pr_info("Console: switching ");
3065         if (!deflt)
3066                 printk("consoles %d-%d ", first+1, last+1);
3067         if (j >= 0) {
3068                 struct vc_data *vc = vc_cons[j].d;
3069
3070                 printk("to %s %s %dx%d\n",
3071                        vc->vc_can_do_color ? "colour" : "mono",
3072                        desc, vc->vc_cols, vc->vc_rows);
3073
3074                 if (k >= 0) {
3075                         vc = vc_cons[k].d;
3076                         update_screen(vc);
3077                 }
3078         } else
3079                 printk("to %s\n", desc);
3080
3081         retval = 0;
3082 err:
3083         console_unlock();
3084         module_put(owner);
3085         return retval;
3086 };
3087
3088 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3089 static int con_is_graphics(const struct consw *csw, int first, int last)
3090 {
3091         int i, retval = 0;
3092
3093         for (i = first; i <= last; i++) {
3094                 struct vc_data *vc = vc_cons[i].d;
3095
3096                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3097                         retval = 1;
3098                         break;
3099                 }
3100         }
3101
3102         return retval;
3103 }
3104
3105 /**
3106  * unbind_con_driver - unbind a console driver
3107  * @csw: pointer to console driver to unregister
3108  * @first: first in range of consoles that @csw should be unbound from
3109  * @last: last in range of consoles that @csw should be unbound from
3110  * @deflt: should next bound console driver be default after @csw is unbound?
3111  *
3112  * To unbind a driver from all possible consoles, pass 0 as @first and
3113  * %MAX_NR_CONSOLES as @last.
3114  *
3115  * @deflt controls whether the console that ends up replacing @csw should be
3116  * the default console.
3117  *
3118  * RETURNS:
3119  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3120  * or 0 on success.
3121  */
3122 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3123 {
3124         struct module *owner = csw->owner;
3125         const struct consw *defcsw = NULL;
3126         struct con_driver *con_driver = NULL, *con_back = NULL;
3127         int i, retval = -ENODEV;
3128
3129         if (!try_module_get(owner))
3130                 return -ENODEV;
3131
3132         console_lock();
3133
3134         /* check if driver is registered and if it is unbindable */
3135         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3136                 con_driver = &registered_con_driver[i];
3137
3138                 if (con_driver->con == csw &&
3139                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3140                         retval = 0;
3141                         break;
3142                 }
3143         }
3144
3145         if (retval) {
3146                 console_unlock();
3147                 goto err;
3148         }
3149
3150         retval = -ENODEV;
3151
3152         /* check if backup driver exists */
3153         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3154                 con_back = &registered_con_driver[i];
3155
3156                 if (con_back->con &&
3157                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3158                         defcsw = con_back->con;
3159                         retval = 0;
3160                         break;
3161                 }
3162         }
3163
3164         if (retval) {
3165                 console_unlock();
3166                 goto err;
3167         }
3168
3169         if (!con_is_bound(csw)) {
3170                 console_unlock();
3171                 goto err;
3172         }
3173
3174         first = max(first, con_driver->first);
3175         last = min(last, con_driver->last);
3176
3177         for (i = first; i <= last; i++) {
3178                 if (con_driver_map[i] == csw) {
3179                         module_put(csw->owner);
3180                         con_driver_map[i] = NULL;
3181                 }
3182         }
3183
3184         if (!con_is_bound(defcsw)) {
3185                 const struct consw *defconsw = conswitchp;
3186
3187                 defcsw->con_startup();
3188                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3189                 /*
3190                  * vgacon may change the default driver to point
3191                  * to dummycon, we restore it here...
3192                  */
3193                 conswitchp = defconsw;
3194         }
3195
3196         if (!con_is_bound(csw))
3197                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3198
3199         console_unlock();
3200         /* ignore return value, binding should not fail */
3201         bind_con_driver(defcsw, first, last, deflt);
3202 err:
3203         module_put(owner);
3204         return retval;
3205
3206 }
3207 EXPORT_SYMBOL(unbind_con_driver);
3208
3209 static int vt_bind(struct con_driver *con)
3210 {
3211         const struct consw *defcsw = NULL, *csw = NULL;
3212         int i, more = 1, first = -1, last = -1, deflt = 0;
3213
3214         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3215             con_is_graphics(con->con, con->first, con->last))
3216                 goto err;
3217
3218         csw = con->con;
3219
3220         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3221                 struct con_driver *con = &registered_con_driver[i];
3222
3223                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3224                         defcsw = con->con;
3225                         break;
3226                 }
3227         }
3228
3229         if (!defcsw)
3230                 goto err;
3231
3232         while (more) {
3233                 more = 0;
3234
3235                 for (i = con->first; i <= con->last; i++) {
3236                         if (con_driver_map[i] == defcsw) {
3237                                 if (first == -1)
3238                                         first = i;
3239                                 last = i;
3240                                 more = 1;
3241                         } else if (first != -1)
3242                                 break;
3243                 }
3244
3245                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3246                         deflt = 1;
3247
3248                 if (first != -1)
3249                         bind_con_driver(csw, first, last, deflt);
3250
3251                 first = -1;
3252                 last = -1;
3253                 deflt = 0;
3254         }
3255
3256 err:
3257         return 0;
3258 }
3259
3260 static int vt_unbind(struct con_driver *con)
3261 {
3262         const struct consw *csw = NULL;
3263         int i, more = 1, first = -1, last = -1, deflt = 0;
3264
3265         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3266             con_is_graphics(con->con, con->first, con->last))
3267                 goto err;
3268
3269         csw = con->con;
3270
3271         while (more) {
3272                 more = 0;
3273
3274                 for (i = con->first; i <= con->last; i++) {
3275                         if (con_driver_map[i] == csw) {
3276                                 if (first == -1)
3277                                         first = i;
3278                                 last = i;
3279                                 more = 1;
3280                         } else if (first != -1)
3281                                 break;
3282                 }
3283
3284                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3285                         deflt = 1;
3286
3287                 if (first != -1)
3288                         unbind_con_driver(csw, first, last, deflt);
3289
3290                 first = -1;
3291                 last = -1;
3292                 deflt = 0;
3293         }
3294
3295 err:
3296         return 0;
3297 }
3298 #else
3299 static inline int vt_bind(struct con_driver *con)
3300 {
3301         return 0;
3302 }
3303 static inline int vt_unbind(struct con_driver *con)
3304 {
3305         return 0;
3306 }
3307 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3308
3309 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3310                           const char *buf, size_t count)
3311 {
3312         struct con_driver *con = dev_get_drvdata(dev);
3313         int bind = simple_strtoul(buf, NULL, 0);
3314
3315         if (bind)
3316                 vt_bind(con);
3317         else
3318                 vt_unbind(con);
3319
3320         return count;
3321 }
3322
3323 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3324                          char *buf)
3325 {
3326         struct con_driver *con = dev_get_drvdata(dev);
3327         int bind = con_is_bound(con->con);
3328
3329         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3330 }
3331
3332 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3333                          char *buf)
3334 {
3335         struct con_driver *con = dev_get_drvdata(dev);
3336
3337         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3338                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3339                          con->desc);
3340
3341 }
3342
3343 static struct device_attribute device_attrs[] = {
3344         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3345         __ATTR(name, S_IRUGO, show_name, NULL),
3346 };
3347
3348 static int vtconsole_init_device(struct con_driver *con)
3349 {
3350         int i;
3351         int error = 0;
3352
3353         con->flag |= CON_DRIVER_FLAG_ATTR;
3354         dev_set_drvdata(con->dev, con);
3355         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3356                 error = device_create_file(con->dev, &device_attrs[i]);
3357                 if (error)
3358                         break;
3359         }
3360
3361         if (error) {
3362                 while (--i >= 0)
3363                         device_remove_file(con->dev, &device_attrs[i]);
3364                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3365         }
3366
3367         return error;
3368 }
3369
3370 static void vtconsole_deinit_device(struct con_driver *con)
3371 {
3372         int i;
3373
3374         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3375                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3376                         device_remove_file(con->dev, &device_attrs[i]);
3377                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3378         }
3379 }
3380
3381 /**
3382  * con_is_bound - checks if driver is bound to the console
3383  * @csw: console driver
3384  *
3385  * RETURNS: zero if unbound, nonzero if bound
3386  *
3387  * Drivers can call this and if zero, they should release
3388  * all resources allocated on con_startup()
3389  */
3390 int con_is_bound(const struct consw *csw)
3391 {
3392         int i, bound = 0;
3393
3394         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3395                 if (con_driver_map[i] == csw) {
3396                         bound = 1;
3397                         break;
3398                 }
3399         }
3400
3401         return bound;
3402 }
3403 EXPORT_SYMBOL(con_is_bound);
3404
3405 /**
3406  * con_debug_enter - prepare the console for the kernel debugger
3407  * @sw: console driver
3408  *
3409  * Called when the console is taken over by the kernel debugger, this
3410  * function needs to save the current console state, then put the console
3411  * into a state suitable for the kernel debugger.
3412  *
3413  * RETURNS:
3414  * Zero on success, nonzero if a failure occurred when trying to prepare
3415  * the console for the debugger.
3416  */
3417 int con_debug_enter(struct vc_data *vc)
3418 {
3419         int ret = 0;
3420
3421         saved_fg_console = fg_console;
3422         saved_last_console = last_console;
3423         saved_want_console = want_console;
3424         saved_vc_mode = vc->vc_mode;
3425         saved_console_blanked = console_blanked;
3426         vc->vc_mode = KD_TEXT;
3427         console_blanked = 0;
3428         if (vc->vc_sw->con_debug_enter)
3429                 ret = vc->vc_sw->con_debug_enter(vc);
3430 #ifdef CONFIG_KGDB_KDB
3431         /* Set the initial LINES variable if it is not already set */
3432         if (vc->vc_rows < 999) {
3433                 int linecount;
3434                 char lns[4];
3435                 const char *setargs[3] = {
3436                         "set",
3437                         "LINES",
3438                         lns,
3439                 };
3440                 if (kdbgetintenv(setargs[0], &linecount)) {
3441                         snprintf(lns, 4, "%i", vc->vc_rows);
3442                         kdb_set(2, setargs);
3443                 }
3444         }
3445         if (vc->vc_cols < 999) {
3446                 int colcount;
3447                 char cols[4];
3448                 const char *setargs[3] = {
3449                         "set",
3450                         "COLUMNS",
3451                         cols,
3452                 };
3453                 if (kdbgetintenv(setargs[0], &colcount)) {
3454                         snprintf(cols, 4, "%i", vc->vc_cols);
3455                         kdb_set(2, setargs);
3456                 }
3457         }
3458 #endif /* CONFIG_KGDB_KDB */
3459         return ret;
3460 }
3461 EXPORT_SYMBOL_GPL(con_debug_enter);
3462
3463 /**
3464  * con_debug_leave - restore console state
3465  * @sw: console driver
3466  *
3467  * Restore the console state to what it was before the kernel debugger
3468  * was invoked.
3469  *
3470  * RETURNS:
3471  * Zero on success, nonzero if a failure occurred when trying to restore
3472  * the console.
3473  */
3474 int con_debug_leave(void)
3475 {
3476         struct vc_data *vc;
3477         int ret = 0;
3478
3479         fg_console = saved_fg_console;
3480         last_console = saved_last_console;
3481         want_console = saved_want_console;
3482         console_blanked = saved_console_blanked;
3483         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3484
3485         vc = vc_cons[fg_console].d;
3486         if (vc->vc_sw->con_debug_leave)
3487                 ret = vc->vc_sw->con_debug_leave(vc);
3488         return ret;
3489 }
3490 EXPORT_SYMBOL_GPL(con_debug_leave);
3491
3492 /**
3493  * register_con_driver - register console driver to console layer
3494  * @csw: console driver
3495  * @first: the first console to take over, minimum value is 0
3496  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3497  *
3498  * DESCRIPTION: This function registers a console driver which can later
3499  * bind to a range of consoles specified by @first and @last. It will
3500  * also initialize the console driver by calling con_startup().
3501  */
3502 int register_con_driver(const struct consw *csw, int first, int last)
3503 {
3504         struct module *owner = csw->owner;
3505         struct con_driver *con_driver;
3506         const char *desc;
3507         int i, retval = 0;
3508
3509         if (!try_module_get(owner))
3510                 return -ENODEV;
3511
3512         console_lock();
3513
3514         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3515                 con_driver = &registered_con_driver[i];
3516
3517                 /* already registered */
3518                 if (con_driver->con == csw)
3519                         retval = -EBUSY;
3520         }
3521
3522         if (retval)
3523                 goto err;
3524
3525         desc = csw->con_startup();
3526
3527         if (!desc)
3528                 goto err;
3529
3530         retval = -EINVAL;
3531
3532         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3533                 con_driver = &registered_con_driver[i];
3534
3535                 if (con_driver->con == NULL) {
3536                         con_driver->con = csw;
3537                         con_driver->desc = desc;
3538                         con_driver->node = i;
3539                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3540                                            CON_DRIVER_FLAG_INIT;
3541                         con_driver->first = first;
3542                         con_driver->last = last;
3543                         retval = 0;
3544                         break;
3545                 }
3546         }
3547
3548         if (retval)
3549                 goto err;
3550
3551         con_driver->dev = device_create(vtconsole_class, NULL,
3552                                                 MKDEV(0, con_driver->node),
3553                                                 NULL, "vtcon%i",
3554                                                 con_driver->node);
3555
3556         if (IS_ERR(con_driver->dev)) {
3557                 printk(KERN_WARNING "Unable to create device for %s; "
3558                        "errno = %ld\n", con_driver->desc,
3559                        PTR_ERR(con_driver->dev));
3560                 con_driver->dev = NULL;
3561         } else {
3562                 vtconsole_init_device(con_driver);
3563         }
3564
3565 err:
3566         console_unlock();
3567         module_put(owner);
3568         return retval;
3569 }
3570 EXPORT_SYMBOL(register_con_driver);
3571
3572 /**
3573  * unregister_con_driver - unregister console driver from console layer
3574  * @csw: console driver
3575  *
3576  * DESCRIPTION: All drivers that registers to the console layer must
3577  * call this function upon exit, or if the console driver is in a state
3578  * where it won't be able to handle console services, such as the
3579  * framebuffer console without loaded framebuffer drivers.
3580  *
3581  * The driver must unbind first prior to unregistration.
3582  */
3583 int unregister_con_driver(const struct consw *csw)
3584 {
3585         int i, retval = -ENODEV;
3586
3587         console_lock();
3588
3589         /* cannot unregister a bound driver */
3590         if (con_is_bound(csw))
3591                 goto err;
3592
3593         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3594                 struct con_driver *con_driver = &registered_con_driver[i];
3595
3596                 if (con_driver->con == csw &&
3597                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3598                         vtconsole_deinit_device(con_driver);
3599                         device_destroy(vtconsole_class,
3600                                        MKDEV(0, con_driver->node));
3601                         con_driver->con = NULL;
3602                         con_driver->desc = NULL;
3603                         con_driver->dev = NULL;
3604                         con_driver->node = 0;
3605                         con_driver->flag = 0;
3606                         con_driver->first = 0;
3607                         con_driver->last = 0;
3608                         retval = 0;
3609                         break;
3610                 }
3611         }
3612 err:
3613         console_unlock();
3614         return retval;
3615 }
3616 EXPORT_SYMBOL(unregister_con_driver);
3617
3618 /*
3619  *      If we support more console drivers, this function is used
3620  *      when a driver wants to take over some existing consoles
3621  *      and become default driver for newly opened ones.
3622  *
3623  *      take_over_console is basically a register followed by unbind
3624  */
3625 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3626 {
3627         int err;
3628
3629         err = register_con_driver(csw, first, last);
3630         /* if we get an busy error we still want to bind the console driver
3631          * and return success, as we may have unbound the console driver
3632          * but not unregistered it.
3633         */
3634         if (err == -EBUSY)
3635                 err = 0;
3636         if (!err)
3637                 bind_con_driver(csw, first, last, deflt);
3638
3639         return err;
3640 }
3641
3642 /*
3643  * give_up_console is a wrapper to unregister_con_driver. It will only
3644  * work if driver is fully unbound.
3645  */
3646 void give_up_console(const struct consw *csw)
3647 {
3648         unregister_con_driver(csw);
3649 }
3650
3651 static int __init vtconsole_class_init(void)
3652 {
3653         int i;
3654
3655         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3656         if (IS_ERR(vtconsole_class)) {
3657                 printk(KERN_WARNING "Unable to create vt console class; "
3658                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3659                 vtconsole_class = NULL;
3660         }
3661
3662         /* Add system drivers to sysfs */
3663         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3664                 struct con_driver *con = &registered_con_driver[i];
3665
3666                 if (con->con && !con->dev) {
3667                         con->dev = device_create(vtconsole_class, NULL,
3668                                                          MKDEV(0, con->node),
3669                                                          NULL, "vtcon%i",
3670                                                          con->node);
3671
3672                         if (IS_ERR(con->dev)) {
3673                                 printk(KERN_WARNING "Unable to create "
3674                                        "device for %s; errno = %ld\n",
3675                                        con->desc, PTR_ERR(con->dev));
3676                                 con->dev = NULL;
3677                         } else {
3678                                 vtconsole_init_device(con);
3679                         }
3680                 }
3681         }
3682
3683         return 0;
3684 }
3685 postcore_initcall(vtconsole_class_init);
3686
3687 #endif
3688
3689 /*
3690  *      Screen blanking
3691  */
3692
3693 static int set_vesa_blanking(char __user *p)
3694 {
3695         unsigned int mode;
3696
3697         if (get_user(mode, p + 1))
3698                 return -EFAULT;
3699
3700         vesa_blank_mode = (mode < 4) ? mode : 0;
3701         return 0;
3702 }
3703
3704 void do_blank_screen(int entering_gfx)
3705 {
3706         struct vc_data *vc = vc_cons[fg_console].d;
3707         int i;
3708
3709         WARN_CONSOLE_UNLOCKED();
3710
3711         if (console_blanked) {
3712                 if (blank_state == blank_vesa_wait) {
3713                         blank_state = blank_off;
3714                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3715                 }
3716                 return;
3717         }
3718
3719         /* entering graphics mode? */
3720         if (entering_gfx) {
3721                 hide_cursor(vc);
3722                 save_screen(vc);
3723                 vc->vc_sw->con_blank(vc, -1, 1);
3724                 console_blanked = fg_console + 1;
3725                 blank_state = blank_off;
3726                 set_origin(vc);
3727                 return;
3728         }
3729
3730         if (blank_state != blank_normal_wait)
3731                 return;
3732         blank_state = blank_off;
3733
3734         /* don't blank graphics */
3735         if (vc->vc_mode != KD_TEXT) {
3736                 console_blanked = fg_console + 1;
3737                 return;
3738         }
3739
3740         hide_cursor(vc);
3741         del_timer_sync(&console_timer);
3742         blank_timer_expired = 0;
3743
3744         save_screen(vc);
3745         /* In case we need to reset origin, blanking hook returns 1 */
3746         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3747         console_blanked = fg_console + 1;
3748         if (i)
3749                 set_origin(vc);
3750
3751         if (console_blank_hook && console_blank_hook(1))
3752                 return;
3753
3754         if (vesa_off_interval && vesa_blank_mode) {
3755                 blank_state = blank_vesa_wait;
3756                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3757         }
3758         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3759 }
3760 EXPORT_SYMBOL(do_blank_screen);
3761
3762 /*
3763  * Called by timer as well as from vt_console_driver
3764  */
3765 void do_unblank_screen(int leaving_gfx)
3766 {
3767         struct vc_data *vc;
3768
3769         /* This should now always be called from a "sane" (read: can schedule)
3770          * context for the sake of the low level drivers, except in the special
3771          * case of oops_in_progress
3772          */
3773         if (!oops_in_progress)
3774                 might_sleep();
3775
3776         WARN_CONSOLE_UNLOCKED();
3777
3778         ignore_poke = 0;
3779         if (!console_blanked)
3780                 return;
3781         if (!vc_cons_allocated(fg_console)) {
3782                 /* impossible */
3783                 pr_warning("unblank_screen: tty %d not allocated ??\n",
3784                            fg_console+1);
3785                 return;
3786         }
3787         vc = vc_cons[fg_console].d;
3788         /* Try to unblank in oops case too */
3789         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3790                 return; /* but leave console_blanked != 0 */
3791
3792         if (blankinterval) {
3793                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3794                 blank_state = blank_normal_wait;
3795         }
3796
3797         console_blanked = 0;
3798         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3799                 /* Low-level driver cannot restore -> do it ourselves */
3800                 update_screen(vc);
3801         if (console_blank_hook)
3802                 console_blank_hook(0);
3803         set_palette(vc);
3804         set_cursor(vc);
3805         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3806 }
3807 EXPORT_SYMBOL(do_unblank_screen);
3808
3809 /*
3810  * This is called by the outside world to cause a forced unblank, mostly for
3811  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3812  * call it with 1 as an argument and so force a mode restore... that may kill
3813  * X or at least garbage the screen but would also make the Oops visible...
3814  */
3815 void unblank_screen(void)
3816 {
3817         do_unblank_screen(0);
3818 }
3819
3820 /*
3821  * We defer the timer blanking to work queue so it can take the console mutex
3822  * (console operations can still happen at irq time, but only from printk which
3823  * has the console mutex. Not perfect yet, but better than no locking
3824  */
3825 static void blank_screen_t(unsigned long dummy)
3826 {
3827         if (unlikely(!keventd_up())) {
3828                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3829                 return;
3830         }
3831         blank_timer_expired = 1;
3832         schedule_work(&console_work);
3833 }
3834
3835 void poke_blanked_console(void)
3836 {
3837         WARN_CONSOLE_UNLOCKED();
3838
3839         /* Add this so we quickly catch whoever might call us in a non
3840          * safe context. Nowadays, unblank_screen() isn't to be called in
3841          * atomic contexts and is allowed to schedule (with the special case
3842          * of oops_in_progress, but that isn't of any concern for this
3843          * function. --BenH.
3844          */
3845         might_sleep();
3846
3847         /* This isn't perfectly race free, but a race here would be mostly harmless,
3848          * at worse, we'll do a spurrious blank and it's unlikely
3849          */
3850         del_timer(&console_timer);
3851         blank_timer_expired = 0;
3852
3853         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3854                 return;
3855         if (console_blanked)
3856                 unblank_screen();
3857         else if (blankinterval) {
3858                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3859                 blank_state = blank_normal_wait;
3860         }
3861 }
3862
3863 /*
3864  *      Palettes
3865  */
3866
3867 static void set_palette(struct vc_data *vc)
3868 {
3869         WARN_CONSOLE_UNLOCKED();
3870
3871         if (vc->vc_mode != KD_GRAPHICS)
3872                 vc->vc_sw->con_set_palette(vc, color_table);
3873 }
3874
3875 /*
3876  * Load palette into the DAC registers. arg points to a colour
3877  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3878  */
3879
3880 int con_set_cmap(unsigned char __user *arg)
3881 {
3882         int i, j, k;
3883         unsigned char colormap[3*16];
3884
3885         if (copy_from_user(colormap, arg, sizeof(colormap)))
3886                 return -EFAULT;
3887
3888         console_lock();
3889         for (i = k = 0; i < 16; i++) {
3890                 default_red[i] = colormap[k++];
3891                 default_grn[i] = colormap[k++];
3892                 default_blu[i] = colormap[k++];
3893         }
3894         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3895                 if (!vc_cons_allocated(i))
3896                         continue;
3897                 for (j = k = 0; j < 16; j++) {
3898                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3899                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3900                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3901                 }
3902                 set_palette(vc_cons[i].d);
3903         }
3904         console_unlock();
3905
3906         return 0;
3907 }
3908
3909 int con_get_cmap(unsigned char __user *arg)
3910 {
3911         int i, k;
3912         unsigned char colormap[3*16];
3913
3914         console_lock();
3915         for (i = k = 0; i < 16; i++) {
3916                 colormap[k++] = default_red[i];
3917                 colormap[k++] = default_grn[i];
3918                 colormap[k++] = default_blu[i];
3919         }
3920         console_unlock();
3921
3922         if (copy_to_user(arg, colormap, sizeof(colormap)))
3923                 return -EFAULT;
3924
3925         return 0;
3926 }
3927
3928 void reset_palette(struct vc_data *vc)
3929 {
3930         int j, k;
3931         for (j=k=0; j<16; j++) {
3932                 vc->vc_palette[k++] = default_red[j];
3933                 vc->vc_palette[k++] = default_grn[j];
3934                 vc->vc_palette[k++] = default_blu[j];
3935         }
3936         set_palette(vc);
3937 }
3938
3939 /*
3940  *  Font switching
3941  *
3942  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3943  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3944  *  depending on width) reserved for each character which is kinda wasty, but
3945  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3946  *  is up to the actual low-level console-driver convert data into its favorite
3947  *  format (maybe we should add a `fontoffset' field to the `display'
3948  *  structure so we won't have to convert the fontdata all the time.
3949  *  /Jes
3950  */
3951
3952 #define max_font_size 65536
3953
3954 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3955 {
3956         struct console_font font;
3957         int rc = -EINVAL;
3958         int c;
3959
3960         if (op->data) {
3961                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3962                 if (!font.data)
3963                         return -ENOMEM;
3964         } else
3965                 font.data = NULL;
3966
3967         console_lock();
3968         if (vc->vc_mode != KD_TEXT)
3969                 rc = -EINVAL;
3970         else if (vc->vc_sw->con_font_get)
3971                 rc = vc->vc_sw->con_font_get(vc, &font);
3972         else
3973                 rc = -ENOSYS;
3974         console_unlock();
3975
3976         if (rc)
3977                 goto out;
3978
3979         c = (font.width+7)/8 * 32 * font.charcount;
3980
3981         if (op->data && font.charcount > op->charcount)
3982                 rc = -ENOSPC;
3983         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3984                 if (font.width > op->width || font.height > op->height)
3985                         rc = -ENOSPC;
3986         } else {
3987                 if (font.width != 8)
3988                         rc = -EIO;
3989                 else if ((op->height && font.height > op->height) ||
3990                          font.height > 32)
3991                         rc = -ENOSPC;
3992         }
3993         if (rc)
3994                 goto out;
3995
3996         op->height = font.height;
3997         op->width = font.width;
3998         op->charcount = font.charcount;
3999
4000         if (op->data && copy_to_user(op->data, font.data, c))
4001                 rc = -EFAULT;
4002
4003 out:
4004         kfree(font.data);
4005         return rc;
4006 }
4007
4008 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4009 {
4010         struct console_font font;
4011         int rc = -EINVAL;
4012         int size;
4013
4014         if (vc->vc_mode != KD_TEXT)
4015                 return -EINVAL;
4016         if (!op->data)
4017                 return -EINVAL;
4018         if (op->charcount > 512)
4019                 return -EINVAL;
4020         if (!op->height) {              /* Need to guess font height [compat] */
4021                 int h, i;
4022                 u8 __user *charmap = op->data;
4023                 u8 tmp;
4024
4025                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4026                    so that we can get rid of this soon */
4027                 if (!(op->flags & KD_FONT_FLAG_OLD))
4028                         return -EINVAL;
4029                 for (h = 32; h > 0; h--)
4030                         for (i = 0; i < op->charcount; i++) {
4031                                 if (get_user(tmp, &charmap[32*i+h-1]))
4032                                         return -EFAULT;
4033                                 if (tmp)
4034                                         goto nonzero;
4035                         }
4036                 return -EINVAL;
4037         nonzero:
4038                 op->height = h;
4039         }
4040         if (op->width <= 0 || op->width > 32 || op->height > 32)
4041                 return -EINVAL;
4042         size = (op->width+7)/8 * 32 * op->charcount;
4043         if (size > max_font_size)
4044                 return -ENOSPC;
4045         font.charcount = op->charcount;
4046         font.height = op->height;
4047         font.width = op->width;
4048         font.data = memdup_user(op->data, size);
4049         if (IS_ERR(font.data))
4050                 return PTR_ERR(font.data);
4051         console_lock();
4052         if (vc->vc_mode != KD_TEXT)
4053                 rc = -EINVAL;
4054         else if (vc->vc_sw->con_font_set)
4055                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4056         else
4057                 rc = -ENOSYS;
4058         console_unlock();
4059         kfree(font.data);
4060         return rc;
4061 }
4062
4063 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4064 {
4065         struct console_font font = {.width = op->width, .height = op->height};
4066         char name[MAX_FONT_NAME];
4067         char *s = name;
4068         int rc;
4069
4070
4071         if (!op->data)
4072                 s = NULL;
4073         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4074                 return -EFAULT;
4075         else
4076                 name[MAX_FONT_NAME - 1] = 0;
4077
4078         console_lock();
4079         if (vc->vc_mode != KD_TEXT) {
4080                 console_unlock();
4081                 return -EINVAL;
4082         }
4083         if (vc->vc_sw->con_font_default)
4084                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4085         else
4086                 rc = -ENOSYS;
4087         console_unlock();
4088         if (!rc) {
4089                 op->width = font.width;
4090                 op->height = font.height;
4091         }
4092         return rc;
4093 }
4094
4095 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4096 {
4097         int con = op->height;
4098         int rc;
4099
4100
4101         console_lock();
4102         if (vc->vc_mode != KD_TEXT)
4103                 rc = -EINVAL;
4104         else if (!vc->vc_sw->con_font_copy)
4105                 rc = -ENOSYS;
4106         else if (con < 0 || !vc_cons_allocated(con))
4107                 rc = -ENOTTY;
4108         else if (con == vc->vc_num)     /* nothing to do */
4109                 rc = 0;
4110         else
4111                 rc = vc->vc_sw->con_font_copy(vc, con);
4112         console_unlock();
4113         return rc;
4114 }
4115
4116 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4117 {
4118         switch (op->op) {
4119         case KD_FONT_OP_SET:
4120                 return con_font_set(vc, op);
4121         case KD_FONT_OP_GET:
4122                 return con_font_get(vc, op);
4123         case KD_FONT_OP_SET_DEFAULT:
4124                 return con_font_default(vc, op);
4125         case KD_FONT_OP_COPY:
4126                 return con_font_copy(vc, op);
4127         }
4128         return -ENOSYS;
4129 }
4130
4131 /*
4132  *      Interface exported to selection and vcs.
4133  */
4134
4135 /* used by selection */
4136 u16 screen_glyph(struct vc_data *vc, int offset)
4137 {
4138         u16 w = scr_readw(screenpos(vc, offset, 1));
4139         u16 c = w & 0xff;
4140
4141         if (w & vc->vc_hi_font_mask)
4142                 c |= 0x100;
4143         return c;
4144 }
4145 EXPORT_SYMBOL_GPL(screen_glyph);
4146
4147 /* used by vcs - note the word offset */
4148 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4149 {
4150         return screenpos(vc, 2 * w_offset, viewed);
4151 }
4152
4153 void getconsxy(struct vc_data *vc, unsigned char *p)
4154 {
4155         p[0] = vc->vc_x;
4156         p[1] = vc->vc_y;
4157 }
4158
4159 void putconsxy(struct vc_data *vc, unsigned char *p)
4160 {
4161         hide_cursor(vc);
4162         gotoxy(vc, p[0], p[1]);
4163         set_cursor(vc);
4164 }
4165
4166 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4167 {
4168         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4169                 return softcursor_original;
4170         return scr_readw(org);
4171 }
4172
4173 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4174 {
4175         scr_writew(val, org);
4176         if ((unsigned long)org == vc->vc_pos) {
4177                 softcursor_original = -1;
4178                 add_softcursor(vc);
4179         }
4180 }
4181
4182 void vcs_scr_updated(struct vc_data *vc)
4183 {
4184         notify_update(vc);
4185 }
4186
4187 /*
4188  *      Visible symbols for modules
4189  */
4190
4191 EXPORT_SYMBOL(color_table);
4192 EXPORT_SYMBOL(default_red);
4193 EXPORT_SYMBOL(default_grn);
4194 EXPORT_SYMBOL(default_blu);
4195 EXPORT_SYMBOL(update_region);
4196 EXPORT_SYMBOL(redraw_screen);
4197 EXPORT_SYMBOL(vc_resize);
4198 EXPORT_SYMBOL(fg_console);
4199 EXPORT_SYMBOL(console_blank_hook);
4200 EXPORT_SYMBOL(console_blanked);
4201 EXPORT_SYMBOL(vc_cons);
4202 EXPORT_SYMBOL(global_cursor_default);
4203 #ifndef VT_SINGLE_DRIVER
4204 EXPORT_SYMBOL(take_over_console);
4205 EXPORT_SYMBOL(give_up_console);
4206 #endif