drivers/char/vt.c

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