SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 <andrewm@uow.edu.au>
  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/tiocl.h>
  93 #include <linux/kbd_kern.h>
  94 #include <linux/consolemap.h>
  95 #include <linux/timer.h>
  96 #include <linux/interrupt.h>
  97 #include <linux/workqueue.h>
  98 #include <linux/bootmem.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103
 104 #include <asm/io.h>
 105 #include <asm/system.h>
 106 #include <asm/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 blankinterval = 10*60*HZ;
 176 static int vesa_off_interval;
 177
 178 static DECLARE_WORK(console_work, console_callback);
 179
 180 /*
 181  * fg_console is the current virtual console,
 182  * last_console is the last used one,
 183  * want_console is the console we want to switch to,
 184  * kmsg_redirect is the console for kernel messages,
 185  */
 186 int fg_console;
 187 int last_console;
 188 int want_console = -1;
 189 int kmsg_redirect;
 190
 191 /*
 192  * For each existing display, we have a pointer to console currently visible
 193  * on that display, allowing consoles other than fg_console to be refreshed
 194  * appropriately. Unless the low-level driver supplies its own display_fg
 195  * variable, we use this one for the "master display".
 196  */
 197 static struct vc_data *master_display_fg;
 198
 199 /*
 200  * Unfortunately, we need to delay tty echo when we're currently writing to the
 201  * console since the code is (and always was) not re-entrant, so we schedule
 202  * all flip requests to process context with schedule-task() and run it from
 203  * console_callback().
 204  */
 205
 206 /*
 207  * For the same reason, we defer scrollback to the console callback.
 208  */
 209 static int scrollback_delta;
 210
 211 /*
 212  * Hook so that the power management routines can (un)blank
 213  * the console on our behalf.
 214  */
 215 int (*console_blank_hook)(int);
 216
 217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 218 static int blank_state;
 219 static int blank_timer_expired;
 220 enum {
 221         blank_off = 0,
 222         blank_normal_wait,
 223         blank_vesa_wait,
 224 };
 225
 226 /*
 227  * Notifier list for console events.
 228  */
 229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 230
 231 int register_vt_notifier(struct notifier_block *nb)
 232 {
 233         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 234 }
 235 EXPORT_SYMBOL_GPL(register_vt_notifier);
 236
 237 int unregister_vt_notifier(struct notifier_block *nb)
 238 {
 239         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 240 }
 241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 242
 243 static void notify_write(struct vc_data *vc, unsigned int unicode)
 244 {
 245         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 246         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 247 }
 248
 249 static void notify_update(struct vc_data *vc)
 250 {
 251         struct vt_notifier_param param = { .vc = vc };
 252         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 253 }
 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)
 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 = vc->vc_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             if (!vc->vc_kmalloced)
 773                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 774             if (!vc->vc_screenbuf) {
 775                 kfree(vc);
 776                 vc_cons[currcons].d = NULL;
 777                 return -ENOMEM;
 778             }
 779             vc->vc_kmalloced = 1;
 780             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 781             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 782         }
 783         return 0;
 784 }
 785
 786 static inline int resize_screen(struct vc_data *vc, int width, int height,
 787                                 int user)
 788 {
 789         /* Resizes the resolution of the display adapater */
 790         int err = 0;
 791
 792         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 793                 err = vc->vc_sw->con_resize(vc, width, height, user);
 794
 795         return err;
 796 }
 797
 798 /*
 799  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 800  * [this is to be used together with some user program
 801  * like resize that changes the hardware videomode]
 802  */
 803 #define VC_RESIZE_MAXCOL (32767)
 804 #define VC_RESIZE_MAXROW (32767)
 805 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 806 {
 807         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 808         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 809         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 810         unsigned int end, user;
 811         unsigned short *newscreen;
 812
 813         WARN_CONSOLE_UNLOCKED();
 814
 815         if (!vc)
 816                 return -ENXIO;
 817
 818         user = vc->vc_resize_user;
 819         vc->vc_resize_user = 0;
 820
 821         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 822                 return -EINVAL;
 823
 824         new_cols = (cols ? cols : vc->vc_cols);
 825         new_rows = (lines ? lines : vc->vc_rows);
 826         new_row_size = new_cols << 1;
 827         new_screen_size = new_row_size * new_rows;
 828
 829         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 830                 return 0;
 831
 832         newscreen = kmalloc(new_screen_size, GFP_USER);
 833         if (!newscreen)
 834                 return -ENOMEM;
 835
 836         old_rows = vc->vc_rows;
 837         old_cols = vc->vc_cols;
 838         old_row_size = vc->vc_size_row;
 839         old_screen_size = vc->vc_screenbuf_size;
 840
 841         err = resize_screen(vc, new_cols, new_rows, user);
 842         if (err) {
 843                 kfree(newscreen);
 844                 return err;
 845         }
 846
 847         vc->vc_rows = new_rows;
 848         vc->vc_cols = new_cols;
 849         vc->vc_size_row = new_row_size;
 850         vc->vc_screenbuf_size = new_screen_size;
 851
 852         rlth = min(old_row_size, new_row_size);
 853         rrem = new_row_size - rlth;
 854         old_origin = vc->vc_origin;
 855         new_origin = (long) newscreen;
 856         new_scr_end = new_origin + new_screen_size;
 857
 858         if (vc->vc_y > new_rows) {
 859                 if (old_rows - vc->vc_y < new_rows) {
 860                         /*
 861                          * Cursor near the bottom, copy contents from the
 862                          * bottom of buffer
 863                          */
 864                         old_origin += (old_rows - new_rows) * old_row_size;
 865                         end = vc->vc_scr_end;
 866                 } else {
 867                         /*
 868                          * Cursor is in no man's land, copy 1/2 screenful
 869                          * from the top and bottom of cursor position
 870                          */
 871                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 872                         end = old_origin + (old_row_size * new_rows);
 873                 }
 874         } else
 875                 /*
 876                  * Cursor near the top, copy contents from the top of buffer
 877                  */
 878                 end = (old_rows > new_rows) ? old_origin +
 879                         (old_row_size * new_rows) :
 880                         vc->vc_scr_end;
 881
 882         update_attr(vc);
 883
 884         while (old_origin < end) {
 885                 scr_memcpyw((unsigned short *) new_origin,
 886                             (unsigned short *) old_origin, rlth);
 887                 if (rrem)
 888                         scr_memsetw((void *)(new_origin + rlth),
 889                                     vc->vc_video_erase_char, rrem);
 890                 old_origin += old_row_size;
 891                 new_origin += new_row_size;
 892         }
 893         if (new_scr_end > new_origin)
 894                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 895                             new_scr_end - new_origin);
 896         if (vc->vc_kmalloced)
 897                 kfree(vc->vc_screenbuf);
 898         vc->vc_screenbuf = newscreen;
 899         vc->vc_kmalloced = 1;
 900         vc->vc_screenbuf_size = new_screen_size;
 901         set_origin(vc);
 902
 903         /* do part of a reset_terminal() */
 904         vc->vc_top = 0;
 905         vc->vc_bottom = vc->vc_rows;
 906         gotoxy(vc, vc->vc_x, vc->vc_y);
 907         save_cur(vc);
 908
 909         if (vc->vc_tty) {
 910                 struct winsize ws, *cws = &vc->vc_tty->winsize;
 911
 912                 memset(&ws, 0, sizeof(ws));
 913                 ws.ws_row = vc->vc_rows;
 914                 ws.ws_col = vc->vc_cols;
 915                 ws.ws_ypixel = vc->vc_scan_lines;
 916                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
 917                     vc->vc_tty->pgrp)
 918                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
 919                 *cws = ws;
 920         }
 921
 922         if (CON_IS_VISIBLE(vc))
 923                 update_screen(vc);
 924         return err;
 925 }
 926
 927 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 928 {
 929         int rc;
 930
 931         acquire_console_sem();
 932         rc = vc_resize(vc, cols, lines);
 933         release_console_sem();
 934         return rc;
 935 }
 936
 937 void vc_deallocate(unsigned int currcons)
 938 {
 939         WARN_CONSOLE_UNLOCKED();
 940
 941         if (vc_cons_allocated(currcons)) {
 942                 struct vc_data *vc = vc_cons[currcons].d;
 943                 struct vt_notifier_param param = { .vc = vc };
 944                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 945                 vc->vc_sw->con_deinit(vc);
 946                 put_pid(vc->vt_pid);
 947                 module_put(vc->vc_sw->owner);
 948                 if (vc->vc_kmalloced)
 949                         kfree(vc->vc_screenbuf);
 950                 if (currcons >= MIN_NR_CONSOLES)
 951                         kfree(vc);
 952                 vc_cons[currcons].d = NULL;
 953         }
 954 }
 955
 956 /*
 957  *      VT102 emulator
 958  */
 959
 960 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 961 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 962 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 963
 964 #define decarm          VC_REPEAT
 965 #define decckm          VC_CKMODE
 966 #define kbdapplic       VC_APPLIC
 967 #define lnm             VC_CRLF
 968
 969 /*
 970  * this is what the terminal answers to a ESC-Z or csi0c query.
 971  */
 972 #define VT100ID "\033[?1;2c"
 973 #define VT102ID "\033[?6c"
 974
 975 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 976                                        8,12,10,14, 9,13,11,15 };
 977
 978 /* the default colour table, for VGA+ colour systems */
 979 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 980     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 981 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 982     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 983 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 984     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 985
 986 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
 987 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
 988 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
 989
 990 /*
 991  * gotoxy() must verify all boundaries, because the arguments
 992  * might also be negative. If the given position is out of
 993  * bounds, the cursor is placed at the nearest margin.
 994  */
 995 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 996 {
 997         int min_y, max_y;
 998
 999         if (new_x < 0)
1000                 vc->vc_x = 0;
1001         else {
1002                 if (new_x >= vc->vc_cols)
1003                         vc->vc_x = vc->vc_cols - 1;
1004                 else
1005                         vc->vc_x = new_x;
1006         }
1007
1008         if (vc->vc_decom) {
1009                 min_y = vc->vc_top;
1010                 max_y = vc->vc_bottom;
1011         } else {
1012                 min_y = 0;
1013                 max_y = vc->vc_rows;
1014         }
1015         if (new_y < min_y)
1016                 vc->vc_y = min_y;
1017         else if (new_y >= max_y)
1018                 vc->vc_y = max_y - 1;
1019         else
1020                 vc->vc_y = new_y;
1021         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1022         vc->vc_need_wrap = 0;
1023 }
1024
1025 /* for absolute user moves, when decom is set */
1026 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1027 {
1028         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1029 }
1030
1031 void scrollback(struct vc_data *vc, int lines)
1032 {
1033         if (!lines)
1034                 lines = vc->vc_rows / 2;
1035         scrolldelta(-lines);
1036 }
1037
1038 void scrollfront(struct vc_data *vc, int lines)
1039 {
1040         if (!lines)
1041                 lines = vc->vc_rows / 2;
1042         scrolldelta(lines);
1043 }
1044
1045 static void lf(struct vc_data *vc)
1046 {
1047         /* don't scroll if above bottom of scrolling region, or
1048          * if below scrolling region
1049          */
1050         if (vc->vc_y + 1 == vc->vc_bottom)
1051                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1052         else if (vc->vc_y < vc->vc_rows - 1) {
1053                 vc->vc_y++;
1054                 vc->vc_pos += vc->vc_size_row;
1055         }
1056         vc->vc_need_wrap = 0;
1057         notify_write(vc, '\n');
1058 }
1059
1060 static void ri(struct vc_data *vc)
1061 {
1062         /* don't scroll if below top of scrolling region, or
1063          * if above scrolling region
1064          */
1065         if (vc->vc_y == vc->vc_top)
1066                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1067         else if (vc->vc_y > 0) {
1068                 vc->vc_y--;
1069                 vc->vc_pos -= vc->vc_size_row;
1070         }
1071         vc->vc_need_wrap = 0;
1072 }
1073
1074 static inline void cr(struct vc_data *vc)
1075 {
1076         vc->vc_pos -= vc->vc_x << 1;
1077         vc->vc_need_wrap = vc->vc_x = 0;
1078         notify_write(vc, '\r');
1079 }
1080
1081 static inline void bs(struct vc_data *vc)
1082 {
1083         if (vc->vc_x) {
1084                 vc->vc_pos -= 2;
1085                 vc->vc_x--;
1086                 vc->vc_need_wrap = 0;
1087                 notify_write(vc, '\b');
1088         }
1089 }
1090
1091 static inline void del(struct vc_data *vc)
1092 {
1093         /* ignored */
1094 }
1095
1096 static void csi_J(struct vc_data *vc, int vpar)
1097 {
1098         unsigned int count;
1099         unsigned short * start;
1100
1101         switch (vpar) {
1102                 case 0: /* erase from cursor to end of display */
1103                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1104                         start = (unsigned short *)vc->vc_pos;
1105                         if (DO_UPDATE(vc)) {
1106                                 /* do in two stages */
1107                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1108                                               vc->vc_cols - vc->vc_x);
1109                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1110                                               vc->vc_rows - vc->vc_y - 1,
1111                                               vc->vc_cols);
1112                         }
1113                         break;
1114                 case 1: /* erase from start to cursor */
1115                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1116                         start = (unsigned short *)vc->vc_origin;
1117                         if (DO_UPDATE(vc)) {
1118                                 /* do in two stages */
1119                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1120                                               vc->vc_cols);
1121                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1122                                               vc->vc_x + 1);
1123                         }
1124                         break;
1125                 case 2: /* erase whole display */
1126                         count = vc->vc_cols * vc->vc_rows;
1127                         start = (unsigned short *)vc->vc_origin;
1128                         if (DO_UPDATE(vc))
1129                                 vc->vc_sw->con_clear(vc, 0, 0,
1130                                               vc->vc_rows,
1131                                               vc->vc_cols);
1132                         break;
1133                 default:
1134                         return;
1135         }
1136         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1137         vc->vc_need_wrap = 0;
1138 }
1139
1140 static void csi_K(struct vc_data *vc, int vpar)
1141 {
1142         unsigned int count;
1143         unsigned short * start;
1144
1145         switch (vpar) {
1146                 case 0: /* erase from cursor to end of line */
1147                         count = vc->vc_cols - vc->vc_x;
1148                         start = (unsigned short *)vc->vc_pos;
1149                         if (DO_UPDATE(vc))
1150                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1151                                                      vc->vc_cols - vc->vc_x);
1152                         break;
1153                 case 1: /* erase from start of line to cursor */
1154                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1155                         count = vc->vc_x + 1;
1156                         if (DO_UPDATE(vc))
1157                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1158                                                      vc->vc_x + 1);
1159                         break;
1160                 case 2: /* erase whole line */
1161                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1162                         count = vc->vc_cols;
1163                         if (DO_UPDATE(vc))
1164                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1165                                               vc->vc_cols);
1166                         break;
1167                 default:
1168                         return;
1169         }
1170         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1171         vc->vc_need_wrap = 0;
1172 }
1173
1174 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1175 {                                         /* not vt100? */
1176         int count;
1177
1178         if (!vpar)
1179                 vpar++;
1180         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1181
1182         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1183         if (DO_UPDATE(vc))
1184                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1185         vc->vc_need_wrap = 0;
1186 }
1187
1188 static void default_attr(struct vc_data *vc)
1189 {
1190         vc->vc_intensity = 1;
1191         vc->vc_italic = 0;
1192         vc->vc_underline = 0;
1193         vc->vc_reverse = 0;
1194         vc->vc_blink = 0;
1195         vc->vc_color = vc->vc_def_color;
1196 }
1197
1198 /* console_sem is held */
1199 static void csi_m(struct vc_data *vc)
1200 {
1201         int i;
1202
1203         for (i = 0; i <= vc->vc_npar; i++)
1204                 switch (vc->vc_par[i]) {
1205                         case 0: /* all attributes off */
1206                                 default_attr(vc);
1207                                 break;
1208                         case 1:
1209                                 vc->vc_intensity = 2;
1210                                 break;
1211                         case 2:
1212                                 vc->vc_intensity = 0;
1213                                 break;
1214                         case 3:
1215                                 vc->vc_italic = 1;
1216                                 break;
1217                         case 4:
1218                                 vc->vc_underline = 1;
1219                                 break;
1220                         case 5:
1221                                 vc->vc_blink = 1;
1222                                 break;
1223                         case 7:
1224                                 vc->vc_reverse = 1;
1225                                 break;
1226                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1227                                   * Select primary font, don't display
1228                                   * control chars if defined, don't set
1229                                   * bit 8 on output.
1230                                   */
1231                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1232                                                 ? vc->vc_G0_charset
1233                                                 : vc->vc_G1_charset, vc);
1234                                 vc->vc_disp_ctrl = 0;
1235                                 vc->vc_toggle_meta = 0;
1236                                 break;
1237                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1238                                   * Select first alternate font, lets
1239                                   * chars < 32 be displayed as ROM chars.
1240                                   */
1241                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1242                                 vc->vc_disp_ctrl = 1;
1243                                 vc->vc_toggle_meta = 0;
1244                                 break;
1245                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1246                                   * Select second alternate font, toggle
1247                                   * high bit before displaying as ROM char.
1248                                   */
1249                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1250                                 vc->vc_disp_ctrl = 1;
1251                                 vc->vc_toggle_meta = 1;
1252                                 break;
1253                         case 21:
1254                         case 22:
1255                                 vc->vc_intensity = 1;
1256                                 break;
1257                         case 23:
1258                                 vc->vc_italic = 0;
1259                                 break;
1260                         case 24:
1261                                 vc->vc_underline = 0;
1262                                 break;
1263                         case 25:
1264                                 vc->vc_blink = 0;
1265                                 break;
1266                         case 27:
1267                                 vc->vc_reverse = 0;
1268                                 break;
1269                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1270                                   * Enables underscore, white foreground
1271                                   * with white underscore (Linux - use
1272                                   * default foreground).
1273                                   */
1274                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1275                                 vc->vc_underline = 1;
1276                                 break;
1277                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1278                                   * Disable underline option.
1279                                   * Reset colour to default? It did this
1280                                   * before...
1281                                   */
1282                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1283                                 vc->vc_underline = 0;
1284                                 break;
1285                         case 49:
1286                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1287                                 break;
1288                         default:
1289                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1290                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1291                                                 | (vc->vc_color & 0xf0);
1292                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1293                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1294                                                 | (vc->vc_color & 0x0f);
1295                                 break;
1296                 }
1297         update_attr(vc);
1298 }
1299
1300 static void respond_string(const char *p, struct tty_struct *tty)
1301 {
1302         while (*p) {
1303                 tty_insert_flip_char(tty, *p, 0);
1304                 p++;
1305         }
1306         con_schedule_flip(tty);
1307 }
1308
1309 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1310 {
1311         char buf[40];
1312
1313         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1314         respond_string(buf, tty);
1315 }
1316
1317 static inline void status_report(struct tty_struct *tty)
1318 {
1319         respond_string("\033[0n", tty); /* Terminal ok */
1320 }
1321
1322 static inline void respond_ID(struct tty_struct * tty)
1323 {
1324         respond_string(VT102ID, tty);
1325 }
1326
1327 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1328 {
1329         char buf[8];
1330
1331         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1332                 (char)('!' + mry));
1333         respond_string(buf, tty);
1334 }
1335
1336 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1337 int mouse_reporting(void)
1338 {
1339         return vc_cons[fg_console].d->vc_report_mouse;
1340 }
1341
1342 /* console_sem is held */
1343 static void set_mode(struct vc_data *vc, int on_off)
1344 {
1345         int i;
1346
1347         for (i = 0; i <= vc->vc_npar; i++)
1348                 if (vc->vc_ques) {
1349                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1350                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1351                                 if (on_off)
1352                                         set_kbd(vc, decckm);
1353                                 else
1354                                         clr_kbd(vc, decckm);
1355                                 break;
1356                         case 3: /* 80/132 mode switch unimplemented */
1357                                 vc->vc_deccolm = on_off;
1358 #if 0
1359                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1360                                 /* this alone does not suffice; some user mode
1361                                    utility has to change the hardware regs */
1362 #endif
1363                                 break;
1364                         case 5:                 /* Inverted screen on/off */
1365                                 if (vc->vc_decscnm != on_off) {
1366                                         vc->vc_decscnm = on_off;
1367                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1368                                         update_attr(vc);
1369                                 }
1370                                 break;
1371                         case 6:                 /* Origin relative/absolute */
1372                                 vc->vc_decom = on_off;
1373                                 gotoxay(vc, 0, 0);
1374                                 break;
1375                         case 7:                 /* Autowrap on/off */
1376                                 vc->vc_decawm = on_off;
1377                                 break;
1378                         case 8:                 /* Autorepeat on/off */
1379                                 if (on_off)
1380                                         set_kbd(vc, decarm);
1381                                 else
1382                                         clr_kbd(vc, decarm);
1383                                 break;
1384                         case 9:
1385                                 vc->vc_report_mouse = on_off ? 1 : 0;
1386                                 break;
1387                         case 25:                /* Cursor on/off */
1388                                 vc->vc_deccm = on_off;
1389                                 break;
1390                         case 1000:
1391                                 vc->vc_report_mouse = on_off ? 2 : 0;
1392                                 break;
1393                         }
1394                 } else {
1395                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1396                         case 3:                 /* Monitor (display ctrls) */
1397                                 vc->vc_disp_ctrl = on_off;
1398                                 break;
1399                         case 4:                 /* Insert Mode on/off */
1400                                 vc->vc_decim = on_off;
1401                                 break;
1402                         case 20:                /* Lf, Enter == CrLf/Lf */
1403                                 if (on_off)
1404                                         set_kbd(vc, lnm);
1405                                 else
1406                                         clr_kbd(vc, lnm);
1407                                 break;
1408                         }
1409                 }
1410 }
1411
1412 /* console_sem is held */
1413 static void setterm_command(struct vc_data *vc)
1414 {
1415         switch(vc->vc_par[0]) {
1416                 case 1: /* set color for underline mode */
1417                         if (vc->vc_can_do_color &&
1418                                         vc->vc_par[1] < 16) {
1419                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1420                                 if (vc->vc_underline)
1421                                         update_attr(vc);
1422                         }
1423                         break;
1424                 case 2: /* set color for half intensity mode */
1425                         if (vc->vc_can_do_color &&
1426                                         vc->vc_par[1] < 16) {
1427                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1428                                 if (vc->vc_intensity == 0)
1429                                         update_attr(vc);
1430                         }
1431                         break;
1432                 case 8: /* store colors as defaults */
1433                         vc->vc_def_color = vc->vc_attr;
1434                         if (vc->vc_hi_font_mask == 0x100)
1435                                 vc->vc_def_color >>= 1;
1436                         default_attr(vc);
1437                         update_attr(vc);
1438                         break;
1439                 case 9: /* set blanking interval */
1440                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1441                         poke_blanked_console();
1442                         break;
1443                 case 10: /* set bell frequency in Hz */
1444                         if (vc->vc_npar >= 1)
1445                                 vc->vc_bell_pitch = vc->vc_par[1];
1446                         else
1447                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1448                         break;
1449                 case 11: /* set bell duration in msec */
1450                         if (vc->vc_npar >= 1)
1451                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1452                                         vc->vc_par[1] * HZ / 1000 : 0;
1453                         else
1454                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1455                         break;
1456                 case 12: /* bring specified console to the front */
1457                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1458                                 set_console(vc->vc_par[1] - 1);
1459                         break;
1460                 case 13: /* unblank the screen */
1461                         poke_blanked_console();
1462                         break;
1463                 case 14: /* set vesa powerdown interval */
1464                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1465                         break;
1466                 case 15: /* activate the previous console */
1467                         set_console(last_console);
1468                         break;
1469         }
1470 }
1471
1472 /* console_sem is held */
1473 static void csi_at(struct vc_data *vc, unsigned int nr)
1474 {
1475         if (nr > vc->vc_cols - vc->vc_x)
1476                 nr = vc->vc_cols - vc->vc_x;
1477         else if (!nr)
1478                 nr = 1;
1479         insert_char(vc, nr);
1480 }
1481
1482 /* console_sem is held */
1483 static void csi_L(struct vc_data *vc, unsigned int nr)
1484 {
1485         if (nr > vc->vc_rows - vc->vc_y)
1486                 nr = vc->vc_rows - vc->vc_y;
1487         else if (!nr)
1488                 nr = 1;
1489         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1490         vc->vc_need_wrap = 0;
1491 }
1492
1493 /* console_sem is held */
1494 static void csi_P(struct vc_data *vc, unsigned int nr)
1495 {
1496         if (nr > vc->vc_cols - vc->vc_x)
1497                 nr = vc->vc_cols - vc->vc_x;
1498         else if (!nr)
1499                 nr = 1;
1500         delete_char(vc, nr);
1501 }
1502
1503 /* console_sem is held */
1504 static void csi_M(struct vc_data *vc, unsigned int nr)
1505 {
1506         if (nr > vc->vc_rows - vc->vc_y)
1507                 nr = vc->vc_rows - vc->vc_y;
1508         else if (!nr)
1509                 nr=1;
1510         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1511         vc->vc_need_wrap = 0;
1512 }
1513
1514 /* console_sem is held (except via vc_init->reset_terminal */
1515 static void save_cur(struct vc_data *vc)
1516 {
1517         vc->vc_saved_x          = vc->vc_x;
1518         vc->vc_saved_y          = vc->vc_y;
1519         vc->vc_s_intensity      = vc->vc_intensity;
1520         vc->vc_s_italic         = vc->vc_italic;
1521         vc->vc_s_underline      = vc->vc_underline;
1522         vc->vc_s_blink          = vc->vc_blink;
1523         vc->vc_s_reverse        = vc->vc_reverse;
1524         vc->vc_s_charset        = vc->vc_charset;
1525         vc->vc_s_color          = vc->vc_color;
1526         vc->vc_saved_G0         = vc->vc_G0_charset;
1527         vc->vc_saved_G1         = vc->vc_G1_charset;
1528 }
1529
1530 /* console_sem is held */
1531 static void restore_cur(struct vc_data *vc)
1532 {
1533         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1534         vc->vc_intensity        = vc->vc_s_intensity;
1535         vc->vc_italic           = vc->vc_s_italic;
1536         vc->vc_underline        = vc->vc_s_underline;
1537         vc->vc_blink            = vc->vc_s_blink;
1538         vc->vc_reverse          = vc->vc_s_reverse;
1539         vc->vc_charset          = vc->vc_s_charset;
1540         vc->vc_color            = vc->vc_s_color;
1541         vc->vc_G0_charset       = vc->vc_saved_G0;
1542         vc->vc_G1_charset       = vc->vc_saved_G1;
1543         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1544         update_attr(vc);
1545         vc->vc_need_wrap = 0;
1546 }
1547
1548 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1549         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1550         ESpalette };
1551
1552 /* console_sem is held (except via vc_init()) */
1553 static void reset_terminal(struct vc_data *vc, int do_clear)
1554 {
1555         vc->vc_top              = 0;
1556         vc->vc_bottom           = vc->vc_rows;
1557         vc->vc_state            = ESnormal;
1558         vc->vc_ques             = 0;
1559         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1560         vc->vc_G0_charset       = LAT1_MAP;
1561         vc->vc_G1_charset       = GRAF_MAP;
1562         vc->vc_charset          = 0;
1563         vc->vc_need_wrap        = 0;
1564         vc->vc_report_mouse     = 0;
1565         vc->vc_utf              = default_utf8;
1566         vc->vc_utf_count        = 0;
1567
1568         vc->vc_disp_ctrl        = 0;
1569         vc->vc_toggle_meta      = 0;
1570
1571         vc->vc_decscnm          = 0;
1572         vc->vc_decom            = 0;
1573         vc->vc_decawm           = 1;
1574         vc->vc_deccm            = 1;
1575         vc->vc_decim            = 0;
1576
1577         set_kbd(vc, decarm);
1578         clr_kbd(vc, decckm);
1579         clr_kbd(vc, kbdapplic);
1580         clr_kbd(vc, lnm);
1581         kbd_table[vc->vc_num].lockstate = 0;
1582         kbd_table[vc->vc_num].slockstate = 0;
1583         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1584         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1585         /* do not do set_leds here because this causes an endless tasklet loop
1586            when the keyboard hasn't been initialized yet */
1587
1588         vc->vc_cursor_type = CUR_DEFAULT;
1589         vc->vc_complement_mask = vc->vc_s_complement_mask;
1590
1591         default_attr(vc);
1592         update_attr(vc);
1593
1594         vc->vc_tab_stop[0]      = 0x01010100;
1595         vc->vc_tab_stop[1]      =
1596         vc->vc_tab_stop[2]      =
1597         vc->vc_tab_stop[3]      =
1598         vc->vc_tab_stop[4]      = 0x01010101;
1599
1600         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1601         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1602
1603         gotoxy(vc, 0, 0);
1604         save_cur(vc);
1605         if (do_clear)
1606             csi_J(vc, 2);
1607 }
1608
1609 /* console_sem is held */
1610 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1611 {
1612         /*
1613          *  Control characters can be used in the _middle_
1614          *  of an escape sequence.
1615          */
1616         switch (c) {
1617         case 0:
1618                 return;
1619         case 7:
1620                 if (vc->vc_bell_duration)
1621                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1622                 return;
1623         case 8:
1624                 bs(vc);
1625                 return;
1626         case 9:
1627                 vc->vc_pos -= (vc->vc_x << 1);
1628                 while (vc->vc_x < vc->vc_cols - 1) {
1629                         vc->vc_x++;
1630                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1631                                 break;
1632                 }
1633                 vc->vc_pos += (vc->vc_x << 1);
1634                 notify_write(vc, '\t');
1635                 return;
1636         case 10: case 11: case 12:
1637                 lf(vc);
1638                 if (!is_kbd(vc, lnm))
1639                         return;
1640         case 13:
1641                 cr(vc);
1642                 return;
1643         case 14:
1644                 vc->vc_charset = 1;
1645                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1646                 vc->vc_disp_ctrl = 1;
1647                 return;
1648         case 15:
1649                 vc->vc_charset = 0;
1650                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1651                 vc->vc_disp_ctrl = 0;
1652                 return;
1653         case 24: case 26:
1654                 vc->vc_state = ESnormal;
1655                 return;
1656         case 27:
1657                 vc->vc_state = ESesc;
1658                 return;
1659         case 127:
1660                 del(vc);
1661                 return;
1662         case 128+27:
1663                 vc->vc_state = ESsquare;
1664                 return;
1665         }
1666         switch(vc->vc_state) {
1667         case ESesc:
1668                 vc->vc_state = ESnormal;
1669                 switch (c) {
1670                 case '[':
1671                         vc->vc_state = ESsquare;
1672                         return;
1673                 case ']':
1674                         vc->vc_state = ESnonstd;
1675                         return;
1676                 case '%':
1677                         vc->vc_state = ESpercent;
1678                         return;
1679                 case 'E':
1680                         cr(vc);
1681                         lf(vc);
1682                         return;
1683                 case 'M':
1684                         ri(vc);
1685                         return;
1686                 case 'D':
1687                         lf(vc);
1688                         return;
1689                 case 'H':
1690                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1691                         return;
1692                 case 'Z':
1693                         respond_ID(tty);
1694                         return;
1695                 case '7':
1696                         save_cur(vc);
1697                         return;
1698                 case '8':
1699                         restore_cur(vc);
1700                         return;
1701                 case '(':
1702                         vc->vc_state = ESsetG0;
1703                         return;
1704                 case ')':
1705                         vc->vc_state = ESsetG1;
1706                         return;
1707                 case '#':
1708                         vc->vc_state = EShash;
1709                         return;
1710                 case 'c':
1711                         reset_terminal(vc, 1);
1712                         return;
1713                 case '>':  /* Numeric keypad */
1714                         clr_kbd(vc, kbdapplic);
1715                         return;
1716                 case '=':  /* Appl. keypad */
1717                         set_kbd(vc, kbdapplic);
1718                         return;
1719                 }
1720                 return;
1721         case ESnonstd:
1722                 if (c=='P') {   /* palette escape sequence */
1723                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1724                                 vc->vc_par[vc->vc_npar] = 0;
1725                         vc->vc_npar = 0;
1726                         vc->vc_state = ESpalette;
1727                         return;
1728                 } else if (c=='R') {   /* reset palette */
1729                         reset_palette(vc);
1730                         vc->vc_state = ESnormal;
1731                 } else
1732                         vc->vc_state = ESnormal;
1733                 return;
1734         case ESpalette:
1735                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1736                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1737                         if (vc->vc_npar == 7) {
1738                                 int i = vc->vc_par[0] * 3, j = 1;
1739                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1740                                 vc->vc_palette[i++] += vc->vc_par[j++];
1741                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1742                                 vc->vc_palette[i++] += vc->vc_par[j++];
1743                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1744                                 vc->vc_palette[i] += vc->vc_par[j];
1745                                 set_palette(vc);
1746                                 vc->vc_state = ESnormal;
1747                         }
1748                 } else
1749                         vc->vc_state = ESnormal;
1750                 return;
1751         case ESsquare:
1752                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1753                         vc->vc_par[vc->vc_npar] = 0;
1754                 vc->vc_npar = 0;
1755                 vc->vc_state = ESgetpars;
1756                 if (c == '[') { /* Function key */
1757                         vc->vc_state=ESfunckey;
1758                         return;
1759                 }
1760                 vc->vc_ques = (c == '?');
1761                 if (vc->vc_ques)
1762                         return;
1763         case ESgetpars:
1764                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1765                         vc->vc_npar++;
1766                         return;
1767                 } else if (c>='0' && c<='9') {
1768                         vc->vc_par[vc->vc_npar] *= 10;
1769                         vc->vc_par[vc->vc_npar] += c - '0';
1770                         return;
1771                 } else
1772                         vc->vc_state = ESgotpars;
1773         case ESgotpars:
1774                 vc->vc_state = ESnormal;
1775                 switch(c) {
1776                 case 'h':
1777                         set_mode(vc, 1);
1778                         return;
1779                 case 'l':
1780                         set_mode(vc, 0);
1781                         return;
1782                 case 'c':
1783                         if (vc->vc_ques) {
1784                                 if (vc->vc_par[0])
1785                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1786                                 else
1787                                         vc->vc_cursor_type = CUR_DEFAULT;
1788                                 return;
1789                         }
1790                         break;
1791                 case 'm':
1792                         if (vc->vc_ques) {
1793                                 clear_selection();
1794                                 if (vc->vc_par[0])
1795                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1796                                 else
1797                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1798                                 return;
1799                         }
1800                         break;
1801                 case 'n':
1802                         if (!vc->vc_ques) {
1803                                 if (vc->vc_par[0] == 5)
1804                                         status_report(tty);
1805                                 else if (vc->vc_par[0] == 6)
1806                                         cursor_report(vc, tty);
1807                         }
1808                         return;
1809                 }
1810                 if (vc->vc_ques) {
1811                         vc->vc_ques = 0;
1812                         return;
1813                 }
1814                 switch(c) {
1815                 case 'G': case '`':
1816                         if (vc->vc_par[0])
1817                                 vc->vc_par[0]--;
1818                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1819                         return;
1820                 case 'A':
1821                         if (!vc->vc_par[0])
1822                                 vc->vc_par[0]++;
1823                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1824                         return;
1825                 case 'B': case 'e':
1826                         if (!vc->vc_par[0])
1827                                 vc->vc_par[0]++;
1828                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1829                         return;
1830                 case 'C': case 'a':
1831                         if (!vc->vc_par[0])
1832                                 vc->vc_par[0]++;
1833                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1834                         return;
1835                 case 'D':
1836                         if (!vc->vc_par[0])
1837                                 vc->vc_par[0]++;
1838                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1839                         return;
1840                 case 'E':
1841                         if (!vc->vc_par[0])
1842                                 vc->vc_par[0]++;
1843                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1844                         return;
1845                 case 'F':
1846                         if (!vc->vc_par[0])
1847                                 vc->vc_par[0]++;
1848                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1849                         return;
1850                 case 'd':
1851                         if (vc->vc_par[0])
1852                                 vc->vc_par[0]--;
1853                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1854                         return;
1855                 case 'H': case 'f':
1856                         if (vc->vc_par[0])
1857                                 vc->vc_par[0]--;
1858                         if (vc->vc_par[1])
1859                                 vc->vc_par[1]--;
1860                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1861                         return;
1862                 case 'J':
1863                         csi_J(vc, vc->vc_par[0]);
1864                         return;
1865                 case 'K':
1866                         csi_K(vc, vc->vc_par[0]);
1867                         return;
1868                 case 'L':
1869                         csi_L(vc, vc->vc_par[0]);
1870                         return;
1871                 case 'M':
1872                         csi_M(vc, vc->vc_par[0]);
1873                         return;
1874                 case 'P':
1875                         csi_P(vc, vc->vc_par[0]);
1876                         return;
1877                 case 'c':
1878                         if (!vc->vc_par[0])
1879                                 respond_ID(tty);
1880                         return;
1881                 case 'g':
1882                         if (!vc->vc_par[0])
1883                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1884                         else if (vc->vc_par[0] == 3) {
1885                                 vc->vc_tab_stop[0] =
1886                                         vc->vc_tab_stop[1] =
1887                                         vc->vc_tab_stop[2] =
1888                                         vc->vc_tab_stop[3] =
1889                                         vc->vc_tab_stop[4] = 0;
1890                         }
1891                         return;
1892                 case 'm':
1893                         csi_m(vc);
1894                         return;
1895                 case 'q': /* DECLL - but only 3 leds */
1896                         /* map 0,1,2,3 to 0,1,2,4 */
1897                         if (vc->vc_par[0] < 4)
1898                                 setledstate(kbd_table + vc->vc_num,
1899                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1900                         return;
1901                 case 'r':
1902                         if (!vc->vc_par[0])
1903                                 vc->vc_par[0]++;
1904                         if (!vc->vc_par[1])
1905                                 vc->vc_par[1] = vc->vc_rows;
1906                         /* Minimum allowed region is 2 lines */
1907                         if (vc->vc_par[0] < vc->vc_par[1] &&
1908                             vc->vc_par[1] <= vc->vc_rows) {
1909                                 vc->vc_top = vc->vc_par[0] - 1;
1910                                 vc->vc_bottom = vc->vc_par[1];
1911                                 gotoxay(vc, 0, 0);
1912                         }
1913                         return;
1914                 case 's':
1915                         save_cur(vc);
1916                         return;
1917                 case 'u':
1918                         restore_cur(vc);
1919                         return;
1920                 case 'X':
1921                         csi_X(vc, vc->vc_par[0]);
1922                         return;
1923                 case '@':
1924                         csi_at(vc, vc->vc_par[0]);
1925                         return;
1926                 case ']': /* setterm functions */
1927                         setterm_command(vc);
1928                         return;
1929                 }
1930                 return;
1931         case ESpercent:
1932                 vc->vc_state = ESnormal;
1933                 switch (c) {
1934                 case '@':  /* defined in ISO 2022 */
1935                         vc->vc_utf = 0;
1936                         return;
1937                 case 'G':  /* prelim official escape code */
1938                 case '8':  /* retained for compatibility */
1939                         vc->vc_utf = 1;
1940                         return;
1941                 }
1942                 return;
1943         case ESfunckey:
1944                 vc->vc_state = ESnormal;
1945                 return;
1946         case EShash:
1947                 vc->vc_state = ESnormal;
1948                 if (c == '8') {
1949                         /* DEC screen alignment test. kludge :-) */
1950                         vc->vc_video_erase_char =
1951                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1952                         csi_J(vc, 2);
1953                         vc->vc_video_erase_char =
1954                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1955                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1956                 }
1957                 return;
1958         case ESsetG0:
1959                 if (c == '0')
1960                         vc->vc_G0_charset = GRAF_MAP;
1961                 else if (c == 'B')
1962                         vc->vc_G0_charset = LAT1_MAP;
1963                 else if (c == 'U')
1964                         vc->vc_G0_charset = IBMPC_MAP;
1965                 else if (c == 'K')
1966                         vc->vc_G0_charset = USER_MAP;
1967                 if (vc->vc_charset == 0)
1968                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1969                 vc->vc_state = ESnormal;
1970                 return;
1971         case ESsetG1:
1972                 if (c == '0')
1973                         vc->vc_G1_charset = GRAF_MAP;
1974                 else if (c == 'B')
1975                         vc->vc_G1_charset = LAT1_MAP;
1976                 else if (c == 'U')
1977                         vc->vc_G1_charset = IBMPC_MAP;
1978                 else if (c == 'K')
1979                         vc->vc_G1_charset = USER_MAP;
1980                 if (vc->vc_charset == 1)
1981                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1982                 vc->vc_state = ESnormal;
1983                 return;
1984         default:
1985                 vc->vc_state = ESnormal;
1986         }
1987 }
1988
1989 /* This is a temporary buffer used to prepare a tty console write
1990  * so that we can easily avoid touching user space while holding the
1991  * console spinlock.  It is allocated in con_init and is shared by
1992  * this code and the vc_screen read/write tty calls.
1993  *
1994  * We have to allocate this statically in the kernel data section
1995  * since console_init (and thus con_init) are called before any
1996  * kernel memory allocation is available.
1997  */
1998 char con_buf[CON_BUF_SIZE];
1999 DEFINE_MUTEX(con_buf_mtx);
2000
2001 /* is_double_width() is based on the wcwidth() implementation by
2002  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2003  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2004  */
2005 struct interval {
2006         uint32_t first;
2007         uint32_t last;
2008 };
2009
2010 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2011 {
2012         int min = 0;
2013         int mid;
2014
2015         if (ucs < table[0].first || ucs > table[max].last)
2016                 return 0;
2017         while (max >= min) {
2018                 mid = (min + max) / 2;
2019                 if (ucs > table[mid].last)
2020                         min = mid + 1;
2021                 else if (ucs < table[mid].first)
2022                         max = mid - 1;
2023                 else
2024                         return 1;
2025         }
2026         return 0;
2027 }
2028
2029 static int is_double_width(uint32_t ucs)
2030 {
2031         static const struct interval double_width[] = {
2032                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2033                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2034                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2035                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2036         };
2037         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2038 }
2039
2040 /* acquires console_sem */
2041 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2042 {
2043 #ifdef VT_BUF_VRAM_ONLY
2044 #define FLUSH do { } while(0);
2045 #else
2046 #define FLUSH if (draw_x >= 0) { \
2047         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2048         draw_x = -1; \
2049         }
2050 #endif
2051
2052         int c, tc, ok, n = 0, draw_x = -1;
2053         unsigned int currcons;
2054         unsigned long draw_from = 0, draw_to = 0;
2055         struct vc_data *vc;
2056         unsigned char vc_attr;
2057         struct vt_notifier_param param;
2058         uint8_t rescan;
2059         uint8_t inverse;
2060         uint8_t width;
2061         u16 himask, charmask;
2062         const unsigned char *orig_buf = NULL;
2063         int orig_count;
2064
2065         if (in_interrupt())
2066                 return count;
2067
2068         might_sleep();
2069
2070         acquire_console_sem();
2071         vc = tty->driver_data;
2072         if (vc == NULL) {
2073                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2074                 release_console_sem();
2075                 return 0;
2076         }
2077
2078         currcons = vc->vc_num;
2079         if (!vc_cons_allocated(currcons)) {
2080             /* could this happen? */
2081             static int error = 0;
2082             if (!error) {
2083                 error = 1;
2084                 printk("con_write: tty %d not allocated\n", currcons+1);
2085             }
2086             release_console_sem();
2087             return 0;
2088         }
2089         release_console_sem();
2090
2091         orig_buf = buf;
2092         orig_count = count;
2093
2094         /* At this point 'buf' is guaranteed to be a kernel buffer
2095          * and therefore no access to userspace (and therefore sleeping)
2096          * will be needed.  The con_buf_mtx serializes all tty based
2097          * console rendering and vcs write/read operations.  We hold
2098          * the console spinlock during the entire write.
2099          */
2100
2101         acquire_console_sem();
2102
2103         vc = tty->driver_data;
2104         if (vc == NULL) {
2105                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2106                 release_console_sem();
2107                 goto out;
2108         }
2109
2110         himask = vc->vc_hi_font_mask;
2111         charmask = himask ? 0x1ff : 0xff;
2112
2113         /* undraw cursor first */
2114         if (IS_FG(vc))
2115                 hide_cursor(vc);
2116
2117         param.vc = vc;
2118
2119         while (!tty->stopped && count) {
2120                 int orig = *buf;
2121                 c = orig;
2122                 buf++;
2123                 n++;
2124                 count--;
2125                 rescan = 0;
2126                 inverse = 0;
2127                 width = 1;
2128
2129                 /* Do no translation at all in control states */
2130                 if (vc->vc_state != ESnormal) {
2131                         tc = c;
2132                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2133                     /* Combine UTF-8 into Unicode in vc_utf_char.
2134                      * vc_utf_count is the number of continuation bytes still
2135                      * expected to arrive.
2136                      * vc_npar is the number of continuation bytes arrived so
2137                      * far
2138                      */
2139 rescan_last_byte:
2140                     if ((c & 0xc0) == 0x80) {
2141                         /* Continuation byte received */
2142                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2143                         if (vc->vc_utf_count) {
2144                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2145                             vc->vc_npar++;
2146                             if (--vc->vc_utf_count) {
2147                                 /* Still need some bytes */
2148                                 continue;
2149                             }
2150                             /* Got a whole character */
2151                             c = vc->vc_utf_char;
2152                             /* Reject overlong sequences */
2153                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2154                                         c > utf8_length_changes[vc->vc_npar])
2155                                 c = 0xfffd;
2156                         } else {
2157                             /* Unexpected continuation byte */
2158                             vc->vc_utf_count = 0;
2159                             c = 0xfffd;
2160                         }
2161                     } else {
2162                         /* Single ASCII byte or first byte of a sequence received */
2163                         if (vc->vc_utf_count) {
2164                             /* Continuation byte expected */
2165                             rescan = 1;
2166                             vc->vc_utf_count = 0;
2167                             c = 0xfffd;
2168                         } else if (c > 0x7f) {
2169                             /* First byte of a multibyte sequence received */
2170                             vc->vc_npar = 0;
2171                             if ((c & 0xe0) == 0xc0) {
2172                                 vc->vc_utf_count = 1;
2173                                 vc->vc_utf_char = (c & 0x1f);
2174                             } else if ((c & 0xf0) == 0xe0) {
2175                                 vc->vc_utf_count = 2;
2176                                 vc->vc_utf_char = (c & 0x0f);
2177                             } else if ((c & 0xf8) == 0xf0) {
2178                                 vc->vc_utf_count = 3;
2179                                 vc->vc_utf_char = (c & 0x07);
2180                             } else if ((c & 0xfc) == 0xf8) {
2181                                 vc->vc_utf_count = 4;
2182                                 vc->vc_utf_char = (c & 0x03);
2183                             } else if ((c & 0xfe) == 0xfc) {
2184                                 vc->vc_utf_count = 5;
2185                                 vc->vc_utf_char = (c & 0x01);
2186                             } else {
2187                                 /* 254 and 255 are invalid */
2188                                 c = 0xfffd;
2189                             }
2190                             if (vc->vc_utf_count) {
2191                                 /* Still need some bytes */
2192                                 continue;
2193                             }
2194                         }
2195                         /* Nothing to do if an ASCII byte was received */
2196                     }
2197                     /* End of UTF-8 decoding. */
2198                     /* c is the received character, or U+FFFD for invalid sequences. */
2199                     /* Replace invalid Unicode code points with U+FFFD too */
2200                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2201                         c = 0xfffd;
2202                     tc = c;
2203                 } else {        /* no utf or alternate charset mode */
2204                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2205                 }
2206
2207                 param.c = tc;
2208                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2209                                         &param) == NOTIFY_STOP)
2210                         continue;
2211
2212                 /* If the original code was a control character we
2213                  * only allow a glyph to be displayed if the code is
2214                  * not normally used (such as for cursor movement) or
2215                  * if the disp_ctrl mode has been explicitly enabled.
2216                  * Certain characters (as given by the CTRL_ALWAYS
2217                  * bitmap) are always displayed as control characters,
2218                  * as the console would be pretty useless without
2219                  * them; to display an arbitrary font position use the
2220                  * direct-to-font zone in UTF-8 mode.
2221                  */
2222                 ok = tc && (c >= 32 ||
2223                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2224                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2225                         && (c != 127 || vc->vc_disp_ctrl)
2226                         && (c != 128+27);
2227
2228                 if (vc->vc_state == ESnormal && ok) {
2229                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2230                                 if (is_double_width(c))
2231                                         width = 2;
2232                         }
2233                         /* Now try to find out how to display it */
2234                         tc = conv_uni_to_pc(vc, tc);
2235                         if (tc & ~charmask) {
2236                                 if (tc == -1 || tc == -2) {
2237                                     continue; /* nothing to display */
2238                                 }
2239                                 /* Glyph not found */
2240                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2241                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2242                                        This would make absolutely no sense with Unicode in mind,
2243                                        but do this for ASCII characters since a font may lack
2244                                        Unicode mapping info and we don't want to end up with
2245                                        having question marks only. */
2246                                     tc = c;
2247                                 } else {
2248                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2249                                     tc = conv_uni_to_pc(vc, 0xfffd);
2250                                     if (tc < 0) {
2251                                         inverse = 1;
2252                                         tc = conv_uni_to_pc(vc, '?');
2253                                         if (tc < 0) tc = '?';
2254                                     }
2255                                 }
2256                         }
2257
2258                         if (!inverse) {
2259                                 vc_attr = vc->vc_attr;
2260                         } else {
2261                                 /* invert vc_attr */
2262                                 if (!vc->vc_can_do_color) {
2263                                         vc_attr = (vc->vc_attr) ^ 0x08;
2264                                 } else if (vc->vc_hi_font_mask == 0x100) {
2265                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2266                                 } else {
2267                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2268                                 }
2269                                 FLUSH
2270                         }
2271
2272                         while (1) {
2273                                 if (vc->vc_need_wrap || vc->vc_decim)
2274                                         FLUSH
2275                                 if (vc->vc_need_wrap) {
2276                                         cr(vc);
2277                                         lf(vc);
2278                                 }
2279                                 if (vc->vc_decim)
2280                                         insert_char(vc, 1);
2281                                 scr_writew(himask ?
2282                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2283                                              (vc_attr << 8) + tc,
2284                                            (u16 *) vc->vc_pos);
2285                                 if (DO_UPDATE(vc) && draw_x < 0) {
2286                                         draw_x = vc->vc_x;
2287                                         draw_from = vc->vc_pos;
2288                                 }
2289                                 if (vc->vc_x == vc->vc_cols - 1) {
2290                                         vc->vc_need_wrap = vc->vc_decawm;
2291                                         draw_to = vc->vc_pos + 2;
2292                                 } else {
2293                                         vc->vc_x++;
2294                                         draw_to = (vc->vc_pos += 2);
2295                                 }
2296
2297                                 if (!--width) break;
2298
2299                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2300                                 if (tc < 0) tc = ' ';
2301                         }
2302                         notify_write(vc, c);
2303
2304                         if (inverse) {
2305                                 FLUSH
2306                         }
2307
2308                         if (rescan) {
2309                                 rescan = 0;
2310                                 inverse = 0;
2311                                 width = 1;
2312                                 c = orig;
2313                                 goto rescan_last_byte;
2314                         }
2315                         continue;
2316                 }
2317                 FLUSH
2318                 do_con_trol(tty, vc, orig);
2319         }
2320         FLUSH
2321         console_conditional_schedule();
2322         release_console_sem();
2323
2324 out:
2325         notify_update(vc);
2326         return n;
2327 #undef FLUSH
2328 }
2329
2330 /*
2331  * This is the console switching callback.
2332  *
2333  * Doing console switching in a process context allows
2334  * us to do the switches asynchronously (needed when we want
2335  * to switch due to a keyboard interrupt).  Synchronization
2336  * with other console code and prevention of re-entrancy is
2337  * ensured with console_sem.
2338  */
2339 static void console_callback(struct work_struct *ignored)
2340 {
2341         acquire_console_sem();
2342
2343         if (want_console >= 0) {
2344                 if (want_console != fg_console &&
2345                     vc_cons_allocated(want_console)) {
2346                         hide_cursor(vc_cons[fg_console].d);
2347                         change_console(vc_cons[want_console].d);
2348                         /* we only changed when the console had already
2349                            been allocated - a new console is not created
2350                            in an interrupt routine */
2351                 }
2352                 want_console = -1;
2353         }
2354         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2355                 do_poke_blanked_console = 0;
2356                 poke_blanked_console();
2357         }
2358         if (scrollback_delta) {
2359                 struct vc_data *vc = vc_cons[fg_console].d;
2360                 clear_selection();
2361                 if (vc->vc_mode == KD_TEXT)
2362                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2363                 scrollback_delta = 0;
2364         }
2365         if (blank_timer_expired) {
2366                 do_blank_screen(0);
2367                 blank_timer_expired = 0;
2368         }
2369         notify_update(vc_cons[fg_console].d);
2370
2371         release_console_sem();
2372 }
2373
2374 int set_console(int nr)
2375 {
2376         struct vc_data *vc = vc_cons[fg_console].d;
2377
2378         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2379                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2380
2381                 /*
2382                  * Console switch will fail in console_callback() or
2383                  * change_console() so there is no point scheduling
2384                  * the callback
2385                  *
2386                  * Existing set_console() users don't check the return
2387                  * value so this shouldn't break anything
2388                  */
2389                 return -EINVAL;
2390         }
2391
2392         want_console = nr;
2393         schedule_console_callback();
2394
2395         return 0;
2396 }
2397
2398 struct tty_driver *console_driver;
2399
2400 #ifdef CONFIG_VT_CONSOLE
2401
2402 /*
2403  *      Console on virtual terminal
2404  *
2405  * The console must be locked when we get here.
2406  */
2407
2408 static void vt_console_print(struct console *co, const char *b, unsigned count)
2409 {
2410         struct vc_data *vc = vc_cons[fg_console].d;
2411         unsigned char c;
2412         static DEFINE_SPINLOCK(printing_lock);
2413         const ushort *start;
2414         ushort cnt = 0;
2415         ushort myx;
2416
2417         /* console busy or not yet initialized */
2418         if (!printable)
2419                 return;
2420         if (!spin_trylock(&printing_lock))
2421                 return;
2422
2423         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2424                 vc = vc_cons[kmsg_redirect - 1].d;
2425
2426         /* read `x' only after setting currcons properly (otherwise
2427            the `x' macro will read the x of the foreground console). */
2428         myx = vc->vc_x;
2429
2430         if (!vc_cons_allocated(fg_console)) {
2431                 /* impossible */
2432                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2433                 goto quit;
2434         }
2435
2436         if (vc->vc_mode != KD_TEXT)
2437                 goto quit;
2438
2439         /* undraw cursor first */
2440         if (IS_FG(vc))
2441                 hide_cursor(vc);
2442
2443         start = (ushort *)vc->vc_pos;
2444
2445         /* Contrived structure to try to emulate original need_wrap behaviour
2446          * Problems caused when we have need_wrap set on '\n' character */
2447         while (count--) {
2448                 c = *b++;
2449                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2450                         if (cnt > 0) {
2451                                 if (CON_IS_VISIBLE(vc))
2452                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2453                                 vc->vc_x += cnt;
2454                                 if (vc->vc_need_wrap)
2455                                         vc->vc_x--;
2456                                 cnt = 0;
2457                         }
2458                         if (c == 8) {           /* backspace */
2459                                 bs(vc);
2460                                 start = (ushort *)vc->vc_pos;
2461                                 myx = vc->vc_x;
2462                                 continue;
2463                         }
2464                         if (c != 13)
2465                                 lf(vc);
2466                         cr(vc);
2467                         start = (ushort *)vc->vc_pos;
2468                         myx = vc->vc_x;
2469                         if (c == 10 || c == 13)
2470                                 continue;
2471                 }
2472                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2473                 notify_write(vc, c);
2474                 cnt++;
2475                 if (myx == vc->vc_cols - 1) {
2476                         vc->vc_need_wrap = 1;
2477                         continue;
2478                 }
2479                 vc->vc_pos += 2;
2480                 myx++;
2481         }
2482         if (cnt > 0) {
2483                 if (CON_IS_VISIBLE(vc))
2484                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2485                 vc->vc_x += cnt;
2486                 if (vc->vc_x == vc->vc_cols) {
2487                         vc->vc_x--;
2488                         vc->vc_need_wrap = 1;
2489                 }
2490         }
2491         set_cursor(vc);
2492         notify_update(vc);
2493
2494 quit:
2495         spin_unlock(&printing_lock);
2496 }
2497
2498 static struct tty_driver *vt_console_device(struct console *c, int *index)
2499 {
2500         *index = c->index ? c->index-1 : fg_console;
2501         return console_driver;
2502 }
2503
2504 static struct console vt_console_driver = {
2505         .name           = "tty",
2506         .write          = vt_console_print,
2507         .device         = vt_console_device,
2508         .unblank        = unblank_screen,
2509         .flags          = CON_PRINTBUFFER,
2510         .index          = -1,
2511 };
2512 #endif
2513
2514 /*
2515  *      Handling of Linux-specific VC ioctls
2516  */
2517
2518 /*
2519  * Generally a bit racy with respect to console_sem().
2520  *
2521  * There are some functions which don't need it.
2522  *
2523  * There are some functions which can sleep for arbitrary periods
2524  * (paste_selection) but we don't need the lock there anyway.
2525  *
2526  * set_selection has locking, and definitely needs it
2527  */
2528
2529 int tioclinux(struct tty_struct *tty, unsigned long arg)
2530 {
2531         char type, data;
2532         char __user *p = (char __user *)arg;
2533         int lines;
2534         int ret;
2535
2536         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2537                 return -EINVAL;
2538         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2539                 return -EPERM;
2540         if (get_user(type, p))
2541                 return -EFAULT;
2542         ret = 0;
2543         switch (type)
2544         {
2545                 case TIOCL_SETSEL:
2546                         acquire_console_sem();
2547                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2548                         release_console_sem();
2549                         break;
2550                 case TIOCL_PASTESEL:
2551                         ret = paste_selection(tty);
2552                         break;
2553                 case TIOCL_UNBLANKSCREEN:
2554                         acquire_console_sem();
2555                         unblank_screen();
2556                         release_console_sem();
2557                         break;
2558                 case TIOCL_SELLOADLUT:
2559                         ret = sel_loadlut(p);
2560                         break;
2561                 case TIOCL_GETSHIFTSTATE:
2562
2563         /*
2564          * Make it possible to react to Shift+Mousebutton.
2565          * Note that 'shift_state' is an undocumented
2566          * kernel-internal variable; programs not closely
2567          * related to the kernel should not use this.
2568          */
2569                         data = shift_state;
2570                         ret = __put_user(data, p);
2571                         break;
2572                 case TIOCL_GETMOUSEREPORTING:
2573                         data = mouse_reporting();
2574                         ret = __put_user(data, p);
2575                         break;
2576                 case TIOCL_SETVESABLANK:
2577                         ret = set_vesa_blanking(p);
2578                         break;
2579                 case TIOCL_GETKMSGREDIRECT:
2580                         data = kmsg_redirect;
2581                         ret = __put_user(data, p);
2582                         break;
2583                 case TIOCL_SETKMSGREDIRECT:
2584                         if (!capable(CAP_SYS_ADMIN)) {
2585                                 ret = -EPERM;
2586                         } else {
2587                                 if (get_user(data, p+1))
2588                                         ret = -EFAULT;
2589                                 else
2590                                         kmsg_redirect = data;
2591                         }
2592                         break;
2593                 case TIOCL_GETFGCONSOLE:
2594                         ret = fg_console;
2595                         break;
2596                 case TIOCL_SCROLLCONSOLE:
2597                         if (get_user(lines, (s32 __user *)(p+4))) {
2598                                 ret = -EFAULT;
2599                         } else {
2600                                 scrollfront(vc_cons[fg_console].d, lines);
2601                                 ret = 0;
2602                         }
2603                         break;
2604                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2605                         acquire_console_sem();
2606                         ignore_poke = 1;
2607                         do_blank_screen(0);
2608                         release_console_sem();
2609                         break;
2610                 case TIOCL_BLANKEDSCREEN:
2611                         ret = console_blanked;
2612                         break;
2613                 default:
2614                         ret = -EINVAL;
2615                         break;
2616         }
2617         return ret;
2618 }
2619
2620 /*
2621  * /dev/ttyN handling
2622  */
2623
2624 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2625 {
2626         int     retval;
2627
2628         retval = do_con_write(tty, buf, count);
2629         con_flush_chars(tty);
2630
2631         return retval;
2632 }
2633
2634 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2635 {
2636         if (in_interrupt())
2637                 return; /* n_r3964 calls put_char() from interrupt context */
2638         do_con_write(tty, &ch, 1);
2639 }
2640
2641 static int con_write_room(struct tty_struct *tty)
2642 {
2643         if (tty->stopped)
2644                 return 0;
2645         return 4096;            /* No limit, really; we're not buffering */
2646 }
2647
2648 static int con_chars_in_buffer(struct tty_struct *tty)
2649 {
2650         return 0;               /* we're not buffering */
2651 }
2652
2653 /*
2654  * con_throttle and con_unthrottle are only used for
2655  * paste_selection(), which has to stuff in a large number of
2656  * characters...
2657  */
2658 static void con_throttle(struct tty_struct *tty)
2659 {
2660 }
2661
2662 static void con_unthrottle(struct tty_struct *tty)
2663 {
2664         struct vc_data *vc = tty->driver_data;
2665
2666         wake_up_interruptible(&vc->paste_wait);
2667 }
2668
2669 /*
2670  * Turn the Scroll-Lock LED on when the tty is stopped
2671  */
2672 static void con_stop(struct tty_struct *tty)
2673 {
2674         int console_num;
2675         if (!tty)
2676                 return;
2677         console_num = tty->index;
2678         if (!vc_cons_allocated(console_num))
2679                 return;
2680         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2681         set_leds();
2682 }
2683
2684 /*
2685  * Turn the Scroll-Lock LED off when the console is started
2686  */
2687 static void con_start(struct tty_struct *tty)
2688 {
2689         int console_num;
2690         if (!tty)
2691                 return;
2692         console_num = tty->index;
2693         if (!vc_cons_allocated(console_num))
2694                 return;
2695         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2696         set_leds();
2697 }
2698
2699 static void con_flush_chars(struct tty_struct *tty)
2700 {
2701         struct vc_data *vc;
2702
2703         if (in_interrupt())     /* from flush_to_ldisc */
2704                 return;
2705
2706         /* if we race with con_close(), vt may be null */
2707         acquire_console_sem();
2708         vc = tty->driver_data;
2709         if (vc)
2710                 set_cursor(vc);
2711         release_console_sem();
2712 }
2713
2714 /*
2715  * Allocate the console screen memory.
2716  */
2717 static int con_open(struct tty_struct *tty, struct file *filp)
2718 {
2719         unsigned int currcons = tty->index;
2720         int ret = 0;
2721
2722         acquire_console_sem();
2723         if (tty->driver_data == NULL) {
2724                 ret = vc_allocate(currcons);
2725                 if (ret == 0) {
2726                         struct vc_data *vc = vc_cons[currcons].d;
2727                         tty->driver_data = vc;
2728                         vc->vc_tty = tty;
2729
2730                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2731                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2732                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2733                         }
2734                         release_console_sem();
2735                         vcs_make_sysfs(tty);
2736                         return ret;
2737                 }
2738         }
2739         release_console_sem();
2740         return ret;
2741 }
2742
2743 /*
2744  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2745  * and taking a ref against the tty while we're in the process of forgetting
2746  * about it and cleaning things up.
2747  *
2748  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2749  */
2750 static void con_close(struct tty_struct *tty, struct file *filp)
2751 {
2752         mutex_lock(&tty_mutex);
2753         acquire_console_sem();
2754         if (tty && tty->count == 1) {
2755                 struct vc_data *vc = tty->driver_data;
2756
2757                 if (vc)
2758                         vc->vc_tty = NULL;
2759                 tty->driver_data = NULL;
2760                 release_console_sem();
2761                 vcs_remove_sysfs(tty);
2762                 mutex_unlock(&tty_mutex);
2763                 /*
2764                  * tty_mutex is released, but we still hold BKL, so there is
2765                  * still exclusion against init_dev()
2766                  */
2767                 return;
2768         }
2769         release_console_sem();
2770         mutex_unlock(&tty_mutex);
2771 }
2772
2773 static int default_italic_color    = 2; // green (ASCII)
2774 static int default_underline_color = 3; // cyan (ASCII)
2775 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2776 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2777
2778 static void vc_init(struct vc_data *vc, unsigned int rows,
2779                     unsigned int cols, int do_clear)
2780 {
2781         int j, k ;
2782
2783         vc->vc_cols = cols;
2784         vc->vc_rows = rows;
2785         vc->vc_size_row = cols << 1;
2786         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2787
2788         set_origin(vc);
2789         vc->vc_pos = vc->vc_origin;
2790         reset_vc(vc);
2791         for (j=k=0; j<16; j++) {
2792                 vc->vc_palette[k++] = default_red[j] ;
2793                 vc->vc_palette[k++] = default_grn[j] ;
2794                 vc->vc_palette[k++] = default_blu[j] ;
2795         }
2796         vc->vc_def_color       = 0x07;   /* white */
2797         vc->vc_ulcolor         = default_underline_color;
2798         vc->vc_itcolor         = default_italic_color;
2799         vc->vc_halfcolor       = 0x08;   /* grey */
2800         init_waitqueue_head(&vc->paste_wait);
2801         reset_terminal(vc, do_clear);
2802 }
2803
2804 /*
2805  * This routine initializes console interrupts, and does nothing
2806  * else. If you want the screen to clear, call tty_write with
2807  * the appropriate escape-sequence.
2808  */
2809
2810 static int __init con_init(void)
2811 {
2812         const char *display_desc = NULL;
2813         struct vc_data *vc;
2814         unsigned int currcons = 0, i;
2815
2816         acquire_console_sem();
2817
2818         if (conswitchp)
2819                 display_desc = conswitchp->con_startup();
2820         if (!display_desc) {
2821                 fg_console = 0;
2822                 release_console_sem();
2823                 return 0;
2824         }
2825
2826         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2827                 struct con_driver *con_driver = &registered_con_driver[i];
2828
2829                 if (con_driver->con == NULL) {
2830                         con_driver->con = conswitchp;
2831                         con_driver->desc = display_desc;
2832                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2833                         con_driver->first = 0;
2834                         con_driver->last = MAX_NR_CONSOLES - 1;
2835                         break;
2836                 }
2837         }
2838
2839         for (i = 0; i < MAX_NR_CONSOLES; i++)
2840                 con_driver_map[i] = conswitchp;
2841
2842         if (blankinterval) {
2843                 blank_state = blank_normal_wait;
2844                 mod_timer(&console_timer, jiffies + blankinterval);
2845         }
2846
2847         /*
2848          * kmalloc is not running yet - we use the bootmem allocator.
2849          */
2850         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2851                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2852                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2853                 visual_init(vc, currcons, 1);
2854                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2855                 vc->vc_kmalloced = 0;
2856                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2857                         currcons || !vc->vc_sw->con_save_screen);
2858         }
2859         currcons = fg_console = 0;
2860         master_display_fg = vc = vc_cons[currcons].d;
2861         set_origin(vc);
2862         save_screen(vc);
2863         gotoxy(vc, vc->vc_x, vc->vc_y);
2864         csi_J(vc, 0);
2865         update_screen(vc);
2866         printk("Console: %s %s %dx%d",
2867                 vc->vc_can_do_color ? "colour" : "mono",
2868                 display_desc, vc->vc_cols, vc->vc_rows);
2869         printable = 1;
2870         printk("\n");
2871
2872         release_console_sem();
2873
2874 #ifdef CONFIG_VT_CONSOLE
2875         register_console(&vt_console_driver);
2876 #endif
2877         return 0;
2878 }
2879 console_initcall(con_init);
2880
2881 static const struct tty_operations con_ops = {
2882         .open = con_open,
2883         .close = con_close,
2884         .write = con_write,
2885         .write_room = con_write_room,
2886         .put_char = con_put_char,
2887         .flush_chars = con_flush_chars,
2888         .chars_in_buffer = con_chars_in_buffer,
2889         .ioctl = vt_ioctl,
2890         .stop = con_stop,
2891         .start = con_start,
2892         .throttle = con_throttle,
2893         .unthrottle = con_unthrottle,
2894 };
2895
2896 int __init vty_init(void)
2897 {
2898         vcs_init();
2899
2900         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2901         if (!console_driver)
2902                 panic("Couldn't allocate console driver\n");
2903         console_driver->owner = THIS_MODULE;
2904         console_driver->name = "tty";
2905         console_driver->name_base = 1;
2906         console_driver->major = TTY_MAJOR;
2907         console_driver->minor_start = 1;
2908         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2909         console_driver->init_termios = tty_std_termios;
2910         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2911         tty_set_operations(console_driver, &con_ops);
2912         if (tty_register_driver(console_driver))
2913                 panic("Couldn't register console driver\n");
2914
2915         kbd_init();
2916         console_map_init();
2917 #ifdef CONFIG_PROM_CONSOLE
2918         prom_con_init();
2919 #endif
2920 #ifdef CONFIG_MDA_CONSOLE
2921         mda_console_init();
2922 #endif
2923         return 0;
2924 }
2925
2926 #ifndef VT_SINGLE_DRIVER
2927 #include <linux/device.h>
2928
2929 static struct class *vtconsole_class;
2930
2931 static int bind_con_driver(const struct consw *csw, int first, int last,
2932                            int deflt)
2933 {
2934         struct module *owner = csw->owner;
2935         const char *desc = NULL;
2936         struct con_driver *con_driver;
2937         int i, j = -1, k = -1, retval = -ENODEV;
2938
2939         if (!try_module_get(owner))
2940                 return -ENODEV;
2941
2942         acquire_console_sem();
2943
2944         /* check if driver is registered */
2945         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2946                 con_driver = &registered_con_driver[i];
2947
2948                 if (con_driver->con == csw) {
2949                         desc = con_driver->desc;
2950                         retval = 0;
2951                         break;
2952                 }
2953         }
2954
2955         if (retval)
2956                 goto err;
2957
2958         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2959                 csw->con_startup();
2960                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2961         }
2962
2963         if (deflt) {
2964                 if (conswitchp)
2965                         module_put(conswitchp->owner);
2966
2967                 __module_get(owner);
2968                 conswitchp = csw;
2969         }
2970
2971         first = max(first, con_driver->first);
2972         last = min(last, con_driver->last);
2973
2974         for (i = first; i <= last; i++) {
2975                 int old_was_color;
2976                 struct vc_data *vc = vc_cons[i].d;
2977
2978                 if (con_driver_map[i])
2979                         module_put(con_driver_map[i]->owner);
2980                 __module_get(owner);
2981                 con_driver_map[i] = csw;
2982
2983                 if (!vc || !vc->vc_sw)
2984                         continue;
2985
2986                 j = i;
2987
2988                 if (CON_IS_VISIBLE(vc)) {
2989                         k = i;
2990                         save_screen(vc);
2991                 }
2992
2993                 old_was_color = vc->vc_can_do_color;
2994                 vc->vc_sw->con_deinit(vc);
2995                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2996                 visual_init(vc, i, 0);
2997                 set_origin(vc);
2998                 update_attr(vc);
2999
3000                 /* If the console changed between mono <-> color, then
3001                  * the attributes in the screenbuf will be wrong.  The
3002                  * following resets all attributes to something sane.
3003                  */
3004                 if (old_was_color != vc->vc_can_do_color)
3005                         clear_buffer_attributes(vc);
3006         }
3007
3008         printk("Console: switching ");
3009         if (!deflt)
3010                 printk("consoles %d-%d ", first+1, last+1);
3011         if (j >= 0) {
3012                 struct vc_data *vc = vc_cons[j].d;
3013
3014                 printk("to %s %s %dx%d\n",
3015                        vc->vc_can_do_color ? "colour" : "mono",
3016                        desc, vc->vc_cols, vc->vc_rows);
3017
3018                 if (k >= 0) {
3019                         vc = vc_cons[k].d;
3020                         update_screen(vc);
3021                 }
3022         } else
3023                 printk("to %s\n", desc);
3024
3025         retval = 0;
3026 err:
3027         release_console_sem();
3028         module_put(owner);
3029         return retval;
3030 };
3031
3032 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3033 static int con_is_graphics(const struct consw *csw, int first, int last)
3034 {
3035         int i, retval = 0;
3036
3037         for (i = first; i <= last; i++) {
3038                 struct vc_data *vc = vc_cons[i].d;
3039
3040                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3041                         retval = 1;
3042                         break;
3043                 }
3044         }
3045
3046         return retval;
3047 }
3048
3049 /**
3050  * unbind_con_driver - unbind a console driver
3051  * @csw: pointer to console driver to unregister
3052  * @first: first in range of consoles that @csw should be unbound from
3053  * @last: last in range of consoles that @csw should be unbound from
3054  * @deflt: should next bound console driver be default after @csw is unbound?
3055  *
3056  * To unbind a driver from all possible consoles, pass 0 as @first and
3057  * %MAX_NR_CONSOLES as @last.
3058  *
3059  * @deflt controls whether the console that ends up replacing @csw should be
3060  * the default console.
3061  *
3062  * RETURNS:
3063  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3064  * or 0 on success.
3065  */
3066 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3067 {
3068         struct module *owner = csw->owner;
3069         const struct consw *defcsw = NULL;
3070         struct con_driver *con_driver = NULL, *con_back = NULL;
3071         int i, retval = -ENODEV;
3072
3073         if (!try_module_get(owner))
3074                 return -ENODEV;
3075
3076         acquire_console_sem();
3077
3078         /* check if driver is registered and if it is unbindable */
3079         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3080                 con_driver = &registered_con_driver[i];
3081
3082                 if (con_driver->con == csw &&
3083                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3084                         retval = 0;
3085                         break;
3086                 }
3087         }
3088
3089         if (retval) {
3090                 release_console_sem();
3091                 goto err;
3092         }
3093
3094         retval = -ENODEV;
3095
3096         /* check if backup driver exists */
3097         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3098                 con_back = &registered_con_driver[i];
3099
3100                 if (con_back->con &&
3101                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3102                         defcsw = con_back->con;
3103                         retval = 0;
3104                         break;
3105                 }
3106         }
3107
3108         if (retval) {
3109                 release_console_sem();
3110                 goto err;
3111         }
3112
3113         if (!con_is_bound(csw)) {
3114                 release_console_sem();
3115                 goto err;
3116         }
3117
3118         first = max(first, con_driver->first);
3119         last = min(last, con_driver->last);
3120
3121         for (i = first; i <= last; i++) {
3122                 if (con_driver_map[i] == csw) {
3123                         module_put(csw->owner);
3124                         con_driver_map[i] = NULL;
3125                 }
3126         }
3127
3128         if (!con_is_bound(defcsw)) {
3129                 const struct consw *defconsw = conswitchp;
3130
3131                 defcsw->con_startup();
3132                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3133                 /*
3134                  * vgacon may change the default driver to point
3135                  * to dummycon, we restore it here...
3136                  */
3137                 conswitchp = defconsw;
3138         }
3139
3140         if (!con_is_bound(csw))
3141                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3142
3143         release_console_sem();
3144         /* ignore return value, binding should not fail */
3145         bind_con_driver(defcsw, first, last, deflt);
3146 err:
3147         module_put(owner);
3148         return retval;
3149
3150 }
3151 EXPORT_SYMBOL(unbind_con_driver);
3152
3153 static int vt_bind(struct con_driver *con)
3154 {
3155         const struct consw *defcsw = NULL, *csw = NULL;
3156         int i, more = 1, first = -1, last = -1, deflt = 0;
3157
3158         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3159             con_is_graphics(con->con, con->first, con->last))
3160                 goto err;
3161
3162         csw = con->con;
3163
3164         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3165                 struct con_driver *con = &registered_con_driver[i];
3166
3167                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3168                         defcsw = con->con;
3169                         break;
3170                 }
3171         }
3172
3173         if (!defcsw)
3174                 goto err;
3175
3176         while (more) {
3177                 more = 0;
3178
3179                 for (i = con->first; i <= con->last; i++) {
3180                         if (con_driver_map[i] == defcsw) {
3181                                 if (first == -1)
3182                                         first = i;
3183                                 last = i;
3184                                 more = 1;
3185                         } else if (first != -1)
3186                                 break;
3187                 }
3188
3189                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3190                         deflt = 1;
3191
3192                 if (first != -1)
3193                         bind_con_driver(csw, first, last, deflt);
3194
3195                 first = -1;
3196                 last = -1;
3197                 deflt = 0;
3198         }
3199
3200 err:
3201         return 0;
3202 }
3203
3204 static int vt_unbind(struct con_driver *con)
3205 {
3206         const struct consw *csw = NULL;
3207         int i, more = 1, first = -1, last = -1, deflt = 0;
3208
3209         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3210             con_is_graphics(con->con, con->first, con->last))
3211                 goto err;
3212
3213         csw = con->con;
3214
3215         while (more) {
3216                 more = 0;
3217
3218                 for (i = con->first; i <= con->last; i++) {
3219                         if (con_driver_map[i] == csw) {
3220                                 if (first == -1)
3221                                         first = i;
3222                                 last = i;
3223                                 more = 1;
3224                         } else if (first != -1)
3225                                 break;
3226                 }
3227
3228                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3229                         deflt = 1;
3230
3231                 if (first != -1)
3232                         unbind_con_driver(csw, first, last, deflt);
3233
3234                 first = -1;
3235                 last = -1;
3236                 deflt = 0;
3237         }
3238
3239 err:
3240         return 0;
3241 }
3242 #else
3243 static inline int vt_bind(struct con_driver *con)
3244 {
3245         return 0;
3246 }
3247 static inline int vt_unbind(struct con_driver *con)
3248 {
3249         return 0;
3250 }
3251 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3252
3253 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3254                           const char *buf, size_t count)
3255 {
3256         struct con_driver *con = dev_get_drvdata(dev);
3257         int bind = simple_strtoul(buf, NULL, 0);
3258
3259         if (bind)
3260                 vt_bind(con);
3261         else
3262                 vt_unbind(con);
3263
3264         return count;
3265 }
3266
3267 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3268                          char *buf)
3269 {
3270         struct con_driver *con = dev_get_drvdata(dev);
3271         int bind = con_is_bound(con->con);
3272
3273         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3274 }
3275
3276 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3277                          char *buf)
3278 {
3279         struct con_driver *con = dev_get_drvdata(dev);
3280
3281         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3282                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3283                          con->desc);
3284
3285 }
3286
3287 static struct device_attribute device_attrs[] = {
3288         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3289         __ATTR(name, S_IRUGO, show_name, NULL),
3290 };
3291
3292 static int vtconsole_init_device(struct con_driver *con)
3293 {
3294         int i;
3295         int error = 0;
3296
3297         con->flag |= CON_DRIVER_FLAG_ATTR;
3298         dev_set_drvdata(con->dev, con);
3299         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3300                 error = device_create_file(con->dev, &device_attrs[i]);
3301                 if (error)
3302                         break;
3303         }
3304
3305         if (error) {
3306                 while (--i >= 0)
3307                         device_remove_file(con->dev, &device_attrs[i]);
3308                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3309         }
3310
3311         return error;
3312 }
3313
3314 static void vtconsole_deinit_device(struct con_driver *con)
3315 {
3316         int i;
3317
3318         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3319                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3320                         device_remove_file(con->dev, &device_attrs[i]);
3321                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3322         }
3323 }
3324
3325 /**
3326  * con_is_bound - checks if driver is bound to the console
3327  * @csw: console driver
3328  *
3329  * RETURNS: zero if unbound, nonzero if bound
3330  *
3331  * Drivers can call this and if zero, they should release
3332  * all resources allocated on con_startup()
3333  */
3334 int con_is_bound(const struct consw *csw)
3335 {
3336         int i, bound = 0;
3337
3338         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3339                 if (con_driver_map[i] == csw) {
3340                         bound = 1;
3341                         break;
3342                 }
3343         }
3344
3345         return bound;
3346 }
3347 EXPORT_SYMBOL(con_is_bound);
3348
3349 /**
3350  * register_con_driver - register console driver to console layer
3351  * @csw: console driver
3352  * @first: the first console to take over, minimum value is 0
3353  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3354  *
3355  * DESCRIPTION: This function registers a console driver which can later
3356  * bind to a range of consoles specified by @first and @last. It will
3357  * also initialize the console driver by calling con_startup().
3358  */
3359 int register_con_driver(const struct consw *csw, int first, int last)
3360 {
3361         struct module *owner = csw->owner;
3362         struct con_driver *con_driver;
3363         const char *desc;
3364         int i, retval = 0;
3365
3366         if (!try_module_get(owner))
3367                 return -ENODEV;
3368
3369         acquire_console_sem();
3370
3371         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3372                 con_driver = &registered_con_driver[i];
3373
3374                 /* already registered */
3375                 if (con_driver->con == csw)
3376                         retval = -EINVAL;
3377         }
3378
3379         if (retval)
3380                 goto err;
3381
3382         desc = csw->con_startup();
3383
3384         if (!desc)
3385                 goto err;
3386
3387         retval = -EINVAL;
3388
3389         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3390                 con_driver = &registered_con_driver[i];
3391
3392                 if (con_driver->con == NULL) {
3393                         con_driver->con = csw;
3394                         con_driver->desc = desc;
3395                         con_driver->node = i;
3396                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3397                                            CON_DRIVER_FLAG_INIT;
3398                         con_driver->first = first;
3399                         con_driver->last = last;
3400                         retval = 0;
3401                         break;
3402                 }
3403         }
3404
3405         if (retval)
3406                 goto err;
3407
3408         con_driver->dev = device_create(vtconsole_class, NULL,
3409                                         MKDEV(0, con_driver->node),
3410                                         "vtcon%i", con_driver->node);
3411
3412         if (IS_ERR(con_driver->dev)) {
3413                 printk(KERN_WARNING "Unable to create device for %s; "
3414                        "errno = %ld\n", con_driver->desc,
3415                        PTR_ERR(con_driver->dev));
3416                 con_driver->dev = NULL;
3417         } else {
3418                 vtconsole_init_device(con_driver);
3419         }
3420
3421 err:
3422         release_console_sem();
3423         module_put(owner);
3424         return retval;
3425 }
3426 EXPORT_SYMBOL(register_con_driver);
3427
3428 /**
3429  * unregister_con_driver - unregister console driver from console layer
3430  * @csw: console driver
3431  *
3432  * DESCRIPTION: All drivers that registers to the console layer must
3433  * call this function upon exit, or if the console driver is in a state
3434  * where it won't be able to handle console services, such as the
3435  * framebuffer console without loaded framebuffer drivers.
3436  *
3437  * The driver must unbind first prior to unregistration.
3438  */
3439 int unregister_con_driver(const struct consw *csw)
3440 {
3441         int i, retval = -ENODEV;
3442
3443         acquire_console_sem();
3444
3445         /* cannot unregister a bound driver */
3446         if (con_is_bound(csw))
3447                 goto err;
3448
3449         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3450                 struct con_driver *con_driver = &registered_con_driver[i];
3451
3452                 if (con_driver->con == csw &&
3453                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3454                         vtconsole_deinit_device(con_driver);
3455                         device_destroy(vtconsole_class,
3456                                        MKDEV(0, con_driver->node));
3457                         con_driver->con = NULL;
3458                         con_driver->desc = NULL;
3459                         con_driver->dev = NULL;
3460                         con_driver->node = 0;
3461                         con_driver->flag = 0;
3462                         con_driver->first = 0;
3463                         con_driver->last = 0;
3464                         retval = 0;
3465                         break;
3466                 }
3467         }
3468 err:
3469         release_console_sem();
3470         return retval;
3471 }
3472 EXPORT_SYMBOL(unregister_con_driver);
3473
3474 /*
3475  *      If we support more console drivers, this function is used
3476  *      when a driver wants to take over some existing consoles
3477  *      and become default driver for newly opened ones.
3478  *
3479  *      take_over_console is basically a register followed by unbind
3480  */
3481 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3482 {
3483         int err;
3484
3485         err = register_con_driver(csw, first, last);
3486
3487         if (!err)
3488                 bind_con_driver(csw, first, last, deflt);
3489
3490         return err;
3491 }
3492
3493 /*
3494  * give_up_console is a wrapper to unregister_con_driver. It will only
3495  * work if driver is fully unbound.
3496  */
3497 void give_up_console(const struct consw *csw)
3498 {
3499         unregister_con_driver(csw);
3500 }
3501
3502 static int __init vtconsole_class_init(void)
3503 {
3504         int i;
3505
3506         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3507         if (IS_ERR(vtconsole_class)) {
3508                 printk(KERN_WARNING "Unable to create vt console class; "
3509                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3510                 vtconsole_class = NULL;
3511         }
3512
3513         /* Add system drivers to sysfs */
3514         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3515                 struct con_driver *con = &registered_con_driver[i];
3516
3517                 if (con->con && !con->dev) {
3518                         con->dev = device_create(vtconsole_class, NULL,
3519                                                  MKDEV(0, con->node),
3520                                                  "vtcon%i", con->node);
3521
3522                         if (IS_ERR(con->dev)) {
3523                                 printk(KERN_WARNING "Unable to create "
3524                                        "device for %s; errno = %ld\n",
3525                                        con->desc, PTR_ERR(con->dev));
3526                                 con->dev = NULL;
3527                         } else {
3528                                 vtconsole_init_device(con);
3529                         }
3530                 }
3531         }
3532
3533         return 0;
3534 }
3535 postcore_initcall(vtconsole_class_init);
3536
3537 #endif
3538
3539 /*
3540  *      Screen blanking
3541  */
3542
3543 static int set_vesa_blanking(char __user *p)
3544 {
3545         unsigned int mode;
3546
3547         if (get_user(mode, p + 1))
3548                 return -EFAULT;
3549
3550         vesa_blank_mode = (mode < 4) ? mode : 0;
3551         return 0;
3552 }
3553
3554 void do_blank_screen(int entering_gfx)
3555 {
3556         struct vc_data *vc = vc_cons[fg_console].d;
3557         int i;
3558
3559         WARN_CONSOLE_UNLOCKED();
3560
3561         if (console_blanked) {
3562                 if (blank_state == blank_vesa_wait) {
3563                         blank_state = blank_off;
3564                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3565                 }
3566                 return;
3567         }
3568
3569         /* entering graphics mode? */
3570         if (entering_gfx) {
3571                 hide_cursor(vc);
3572                 save_screen(vc);
3573                 vc->vc_sw->con_blank(vc, -1, 1);
3574                 console_blanked = fg_console + 1;
3575                 blank_state = blank_off;
3576                 set_origin(vc);
3577                 return;
3578         }
3579
3580         if (blank_state != blank_normal_wait)
3581                 return;
3582         blank_state = blank_off;
3583
3584         /* don't blank graphics */
3585         if (vc->vc_mode != KD_TEXT) {
3586                 console_blanked = fg_console + 1;
3587                 return;
3588         }
3589
3590         hide_cursor(vc);
3591         del_timer_sync(&console_timer);
3592         blank_timer_expired = 0;
3593
3594         save_screen(vc);
3595         /* In case we need to reset origin, blanking hook returns 1 */
3596         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3597         console_blanked = fg_console + 1;
3598         if (i)
3599                 set_origin(vc);
3600
3601         if (console_blank_hook && console_blank_hook(1))
3602                 return;
3603
3604         if (vesa_off_interval && vesa_blank_mode) {
3605                 blank_state = blank_vesa_wait;
3606                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3607         }
3608 }
3609 EXPORT_SYMBOL(do_blank_screen);
3610
3611 /*
3612  * Called by timer as well as from vt_console_driver
3613  */
3614 void do_unblank_screen(int leaving_gfx)
3615 {
3616         struct vc_data *vc;
3617
3618         /* This should now always be called from a "sane" (read: can schedule)
3619          * context for the sake of the low level drivers, except in the special
3620          * case of oops_in_progress
3621          */
3622         if (!oops_in_progress)
3623                 might_sleep();
3624
3625         WARN_CONSOLE_UNLOCKED();
3626
3627         ignore_poke = 0;
3628         if (!console_blanked)
3629                 return;
3630         if (!vc_cons_allocated(fg_console)) {
3631                 /* impossible */
3632                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3633                 return;
3634         }
3635         vc = vc_cons[fg_console].d;
3636         if (vc->vc_mode != KD_TEXT)
3637                 return; /* but leave console_blanked != 0 */
3638
3639         if (blankinterval) {
3640                 mod_timer(&console_timer, jiffies + blankinterval);
3641                 blank_state = blank_normal_wait;
3642         }
3643
3644         console_blanked = 0;
3645         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3646                 /* Low-level driver cannot restore -> do it ourselves */
3647                 update_screen(vc);
3648         if (console_blank_hook)
3649                 console_blank_hook(0);
3650         set_palette(vc);
3651         set_cursor(vc);
3652 }
3653 EXPORT_SYMBOL(do_unblank_screen);
3654
3655 /*
3656  * This is called by the outside world to cause a forced unblank, mostly for
3657  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3658  * call it with 1 as an argument and so force a mode restore... that may kill
3659  * X or at least garbage the screen but would also make the Oops visible...
3660  */
3661 void unblank_screen(void)
3662 {
3663         do_unblank_screen(0);
3664 }
3665
3666 /*
3667  * We defer the timer blanking to work queue so it can take the console mutex
3668  * (console operations can still happen at irq time, but only from printk which
3669  * has the console mutex. Not perfect yet, but better than no locking
3670  */
3671 static void blank_screen_t(unsigned long dummy)
3672 {
3673         if (unlikely(!keventd_up())) {
3674                 mod_timer(&console_timer, jiffies + blankinterval);
3675                 return;
3676         }
3677         blank_timer_expired = 1;
3678         schedule_work(&console_work);
3679 }
3680
3681 void poke_blanked_console(void)
3682 {
3683         WARN_CONSOLE_UNLOCKED();
3684
3685         /* Add this so we quickly catch whoever might call us in a non
3686          * safe context. Nowadays, unblank_screen() isn't to be called in
3687          * atomic contexts and is allowed to schedule (with the special case
3688          * of oops_in_progress, but that isn't of any concern for this
3689          * function. --BenH.
3690          */
3691         might_sleep();
3692
3693         /* This isn't perfectly race free, but a race here would be mostly harmless,
3694          * at worse, we'll do a spurrious blank and it's unlikely
3695          */
3696         del_timer(&console_timer);
3697         blank_timer_expired = 0;
3698
3699         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3700                 return;
3701         if (console_blanked)
3702                 unblank_screen();
3703         else if (blankinterval) {
3704                 mod_timer(&console_timer, jiffies + blankinterval);
3705                 blank_state = blank_normal_wait;
3706         }
3707 }
3708
3709 /*
3710  *      Palettes
3711  */
3712
3713 static void set_palette(struct vc_data *vc)
3714 {
3715         WARN_CONSOLE_UNLOCKED();
3716
3717         if (vc->vc_mode != KD_GRAPHICS)
3718                 vc->vc_sw->con_set_palette(vc, color_table);
3719 }
3720
3721 static int set_get_cmap(unsigned char __user *arg, int set)
3722 {
3723     int i, j, k;
3724
3725     WARN_CONSOLE_UNLOCKED();
3726
3727     for (i = 0; i < 16; i++)
3728         if (set) {
3729             get_user(default_red[i], arg++);
3730             get_user(default_grn[i], arg++);
3731             get_user(default_blu[i], arg++);
3732         } else {
3733             put_user(default_red[i], arg++);
3734             put_user(default_grn[i], arg++);
3735             put_user(default_blu[i], arg++);
3736         }
3737     if (set) {
3738         for (i = 0; i < MAX_NR_CONSOLES; i++)
3739             if (vc_cons_allocated(i)) {
3740                 for (j = k = 0; j < 16; j++) {
3741                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3742                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3743                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3744                 }
3745                 set_palette(vc_cons[i].d);
3746             }
3747     }
3748     return 0;
3749 }
3750
3751 /*
3752  * Load palette into the DAC registers. arg points to a colour
3753  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3754  */
3755
3756 int con_set_cmap(unsigned char __user *arg)
3757 {
3758         int rc;
3759
3760         acquire_console_sem();
3761         rc = set_get_cmap (arg,1);
3762         release_console_sem();
3763
3764         return rc;
3765 }
3766
3767 int con_get_cmap(unsigned char __user *arg)
3768 {
3769         int rc;
3770
3771         acquire_console_sem();
3772         rc = set_get_cmap (arg,0);
3773         release_console_sem();
3774
3775         return rc;
3776 }
3777
3778 void reset_palette(struct vc_data *vc)
3779 {
3780         int j, k;
3781         for (j=k=0; j<16; j++) {
3782                 vc->vc_palette[k++] = default_red[j];
3783                 vc->vc_palette[k++] = default_grn[j];
3784                 vc->vc_palette[k++] = default_blu[j];
3785         }
3786         set_palette(vc);
3787 }
3788
3789 /*
3790  *  Font switching
3791  *
3792  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3793  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3794  *  depending on width) reserved for each character which is kinda wasty, but
3795  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3796  *  is upto the actual low-level console-driver convert data into its favorite
3797  *  format (maybe we should add a `fontoffset' field to the `display'
3798  *  structure so we won't have to convert the fontdata all the time.
3799  *  /Jes
3800  */
3801
3802 #define max_font_size 65536
3803
3804 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3805 {
3806         struct console_font font;
3807         int rc = -EINVAL;
3808         int c;
3809
3810         if (vc->vc_mode != KD_TEXT)
3811                 return -EINVAL;
3812
3813         if (op->data) {
3814                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3815                 if (!font.data)
3816                         return -ENOMEM;
3817         } else
3818                 font.data = NULL;
3819
3820         acquire_console_sem();
3821         if (vc->vc_sw->con_font_get)
3822                 rc = vc->vc_sw->con_font_get(vc, &font);
3823         else
3824                 rc = -ENOSYS;
3825         release_console_sem();
3826
3827         if (rc)
3828                 goto out;
3829
3830         c = (font.width+7)/8 * 32 * font.charcount;
3831
3832         if (op->data && font.charcount > op->charcount)
3833                 rc = -ENOSPC;
3834         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3835                 if (font.width > op->width || font.height > op->height)
3836                         rc = -ENOSPC;
3837         } else {
3838                 if (font.width != 8)
3839                         rc = -EIO;
3840                 else if ((op->height && font.height > op->height) ||
3841                          font.height > 32)
3842                         rc = -ENOSPC;
3843         }
3844         if (rc)
3845                 goto out;
3846
3847         op->height = font.height;
3848         op->width = font.width;
3849         op->charcount = font.charcount;
3850
3851         if (op->data && copy_to_user(op->data, font.data, c))
3852                 rc = -EFAULT;
3853
3854 out:
3855         kfree(font.data);
3856         return rc;
3857 }
3858
3859 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3860 {
3861         struct console_font font;
3862         int rc = -EINVAL;
3863         int size;
3864
3865         if (vc->vc_mode != KD_TEXT)
3866                 return -EINVAL;
3867         if (!op->data)
3868                 return -EINVAL;
3869         if (op->charcount > 512)
3870                 return -EINVAL;
3871         if (!op->height) {              /* Need to guess font height [compat] */
3872                 int h, i;
3873                 u8 __user *charmap = op->data;
3874                 u8 tmp;
3875
3876                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3877                    so that we can get rid of this soon */
3878                 if (!(op->flags & KD_FONT_FLAG_OLD))
3879                         return -EINVAL;
3880                 for (h = 32; h > 0; h--)
3881                         for (i = 0; i < op->charcount; i++) {
3882                                 if (get_user(tmp, &charmap[32*i+h-1]))
3883                                         return -EFAULT;
3884                                 if (tmp)
3885                                         goto nonzero;
3886                         }
3887                 return -EINVAL;
3888         nonzero:
3889                 op->height = h;
3890         }
3891         if (op->width <= 0 || op->width > 32 || op->height > 32)
3892                 return -EINVAL;
3893         size = (op->width+7)/8 * 32 * op->charcount;
3894         if (size > max_font_size)
3895                 return -ENOSPC;
3896         font.charcount = op->charcount;
3897         font.height = op->height;
3898         font.width = op->width;
3899         font.data = kmalloc(size, GFP_KERNEL);
3900         if (!font.data)
3901                 return -ENOMEM;
3902         if (copy_from_user(font.data, op->data, size)) {
3903                 kfree(font.data);
3904                 return -EFAULT;
3905         }
3906         acquire_console_sem();
3907         if (vc->vc_sw->con_font_set)
3908                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3909         else
3910                 rc = -ENOSYS;
3911         release_console_sem();
3912         kfree(font.data);
3913         return rc;
3914 }
3915
3916 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3917 {
3918         struct console_font font = {.width = op->width, .height = op->height};
3919         char name[MAX_FONT_NAME];
3920         char *s = name;
3921         int rc;
3922
3923         if (vc->vc_mode != KD_TEXT)
3924                 return -EINVAL;
3925
3926         if (!op->data)
3927                 s = NULL;
3928         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3929                 return -EFAULT;
3930         else
3931                 name[MAX_FONT_NAME - 1] = 0;
3932
3933         acquire_console_sem();
3934         if (vc->vc_sw->con_font_default)
3935                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3936         else
3937                 rc = -ENOSYS;
3938         release_console_sem();
3939         if (!rc) {
3940                 op->width = font.width;
3941                 op->height = font.height;
3942         }
3943         return rc;
3944 }
3945
3946 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3947 {
3948         int con = op->height;
3949         int rc;
3950
3951         if (vc->vc_mode != KD_TEXT)
3952                 return -EINVAL;
3953
3954         acquire_console_sem();
3955         if (!vc->vc_sw->con_font_copy)
3956                 rc = -ENOSYS;
3957         else if (con < 0 || !vc_cons_allocated(con))
3958                 rc = -ENOTTY;
3959         else if (con == vc->vc_num)     /* nothing to do */
3960                 rc = 0;
3961         else
3962                 rc = vc->vc_sw->con_font_copy(vc, con);
3963         release_console_sem();
3964         return rc;
3965 }
3966
3967 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3968 {
3969         switch (op->op) {
3970         case KD_FONT_OP_SET:
3971                 return con_font_set(vc, op);
3972         case KD_FONT_OP_GET:
3973                 return con_font_get(vc, op);
3974         case KD_FONT_OP_SET_DEFAULT:
3975                 return con_font_default(vc, op);
3976         case KD_FONT_OP_COPY:
3977                 return con_font_copy(vc, op);
3978         }
3979         return -ENOSYS;
3980 }
3981
3982 /*
3983  *      Interface exported to selection and vcs.
3984  */
3985
3986 /* used by selection */
3987 u16 screen_glyph(struct vc_data *vc, int offset)
3988 {
3989         u16 w = scr_readw(screenpos(vc, offset, 1));
3990         u16 c = w & 0xff;
3991
3992         if (w & vc->vc_hi_font_mask)
3993                 c |= 0x100;
3994         return c;
3995 }
3996
3997 /* used by vcs - note the word offset */
3998 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3999 {
4000         return screenpos(vc, 2 * w_offset, viewed);
4001 }
4002
4003 void getconsxy(struct vc_data *vc, unsigned char *p)
4004 {
4005         p[0] = vc->vc_x;
4006         p[1] = vc->vc_y;
4007 }
4008
4009 void putconsxy(struct vc_data *vc, unsigned char *p)
4010 {
4011         hide_cursor(vc);
4012         gotoxy(vc, p[0], p[1]);
4013         set_cursor(vc);
4014 }
4015
4016 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4017 {
4018         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4019                 return softcursor_original;
4020         return scr_readw(org);
4021 }
4022
4023 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4024 {
4025         scr_writew(val, org);
4026         if ((unsigned long)org == vc->vc_pos) {
4027                 softcursor_original = -1;
4028                 add_softcursor(vc);
4029         }
4030 }
4031
4032 /*
4033  *      Visible symbols for modules
4034  */
4035
4036 EXPORT_SYMBOL(color_table);
4037 EXPORT_SYMBOL(default_red);
4038 EXPORT_SYMBOL(default_grn);
4039 EXPORT_SYMBOL(default_blu);
4040 EXPORT_SYMBOL(update_region);
4041 EXPORT_SYMBOL(redraw_screen);
4042 EXPORT_SYMBOL(vc_resize);
4043 EXPORT_SYMBOL(vc_lock_resize);
4044 EXPORT_SYMBOL(fg_console);
4045 EXPORT_SYMBOL(console_blank_hook);
4046 EXPORT_SYMBOL(console_blanked);
4047 EXPORT_SYMBOL(vc_cons);
4048 #ifndef VT_SINGLE_DRIVER
4049 EXPORT_SYMBOL(take_over_console);
4050 EXPORT_SYMBOL(give_up_console);
4051 #endif