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) && !console_blanked)
 265 #endif
 266
 267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 268 {
 269         unsigned short *p;
 270
 271         if (!viewed)
 272                 p = (unsigned short *)(vc->vc_origin + offset);
 273         else if (!vc->vc_sw->con_screen_pos)
 274                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 275         else
 276                 p = vc->vc_sw->con_screen_pos(vc, offset);
 277         return p;
 278 }
 279
 280 static inline void scrolldelta(int lines)
 281 {
 282         scrollback_delta += lines;
 283         schedule_console_callback();
 284 }
 285
 286 void schedule_console_callback(void)
 287 {
 288         schedule_work(&console_work);
 289 }
 290
 291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 292 {
 293         unsigned short *d, *s;
 294
 295         if (t+nr >= b)
 296                 nr = b - t - 1;
 297         if (b > vc->vc_rows || t >= b || nr < 1)
 298                 return;
 299         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 300                 return;
 301         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 302         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 303         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 304         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_scrl_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_scrl_erase_char, 2 * step);
 323 }
 324
 325 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 326 {
 327 #ifndef VT_BUF_VRAM_ONLY
 328         unsigned int xx, yy, offset;
 329         u16 *p;
 330
 331         p = (u16 *) start;
 332         if (!vc->vc_sw->con_getxy) {
 333                 offset = (start - vc->vc_origin) / 2;
 334                 xx = offset % vc->vc_cols;
 335                 yy = offset / vc->vc_cols;
 336         } else {
 337                 int nxx, nyy;
 338                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 339                 xx = nxx; yy = nyy;
 340         }
 341         for(;;) {
 342                 u16 attrib = scr_readw(p) & 0xff00;
 343                 int startx = xx;
 344                 u16 *q = p;
 345                 while (xx < vc->vc_cols && count) {
 346                         if (attrib != (scr_readw(p) & 0xff00)) {
 347                                 if (p > q)
 348                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 349                                 startx = xx;
 350                                 q = p;
 351                                 attrib = scr_readw(p) & 0xff00;
 352                         }
 353                         p++;
 354                         xx++;
 355                         count--;
 356                 }
 357                 if (p > q)
 358                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 359                 if (!count)
 360                         break;
 361                 xx = 0;
 362                 yy++;
 363                 if (vc->vc_sw->con_getxy) {
 364                         p = (u16 *)start;
 365                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 366                 }
 367         }
 368 #endif
 369 }
 370
 371 void update_region(struct vc_data *vc, unsigned long start, int count)
 372 {
 373         WARN_CONSOLE_UNLOCKED();
 374
 375         if (DO_UPDATE(vc)) {
 376                 hide_cursor(vc);
 377                 do_update_region(vc, start, count);
 378                 set_cursor(vc);
 379         }
 380 }
 381
 382 /* Structure of attributes is hardware-dependent */
 383
 384 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 385     u8 _underline, u8 _reverse, u8 _italic)
 386 {
 387         if (vc->vc_sw->con_build_attr)
 388                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 389                        _blink, _underline, _reverse, _italic);
 390
 391 #ifndef VT_BUF_VRAM_ONLY
 392 /*
 393  * ++roman: I completely changed the attribute format for monochrome
 394  * mode (!can_do_color). The formerly used MDA (monochrome display
 395  * adapter) format didn't allow the combination of certain effects.
 396  * Now the attribute is just a bit vector:
 397  *  Bit 0..1: intensity (0..2)
 398  *  Bit 2   : underline
 399  *  Bit 3   : reverse
 400  *  Bit 7   : blink
 401  */
 402         {
 403         u8 a = _color;
 404         if (!vc->vc_can_do_color)
 405                 return _intensity |
 406                        (_italic ? 2 : 0) |
 407                        (_underline ? 4 : 0) |
 408                        (_reverse ? 8 : 0) |
 409                        (_blink ? 0x80 : 0);
 410         if (_italic)
 411                 a = (a & 0xF0) | vc->vc_itcolor;
 412         else if (_underline)
 413                 a = (a & 0xf0) | vc->vc_ulcolor;
 414         else if (_intensity == 0)
 415                 a = (a & 0xf0) | vc->vc_ulcolor;
 416         if (_reverse)
 417                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 418         if (_blink)
 419                 a ^= 0x80;
 420         if (_intensity == 2)
 421                 a ^= 0x08;
 422         if (vc->vc_hi_font_mask == 0x100)
 423                 a <<= 1;
 424         return a;
 425         }
 426 #else
 427         return 0;
 428 #endif
 429 }
 430
 431 static void update_attr(struct vc_data *vc)
 432 {
 433         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 434                       vc->vc_blink, vc->vc_underline,
 435                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 436         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 437         vc->vc_scrl_erase_char = (build_attr(vc, vc->vc_def_color, 1, false, false, vc->vc_decscnm, false) << 8) | ' ';
 438 }
 439
 440 /* Note: inverting the screen twice should revert to the original state */
 441 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 442 {
 443         unsigned short *p;
 444
 445         WARN_CONSOLE_UNLOCKED();
 446
 447         count /= 2;
 448         p = screenpos(vc, offset, viewed);
 449         if (vc->vc_sw->con_invert_region)
 450                 vc->vc_sw->con_invert_region(vc, p, count);
 451 #ifndef VT_BUF_VRAM_ONLY
 452         else {
 453                 u16 *q = p;
 454                 int cnt = count;
 455                 u16 a;
 456
 457                 if (!vc->vc_can_do_color) {
 458                         while (cnt--) {
 459                             a = scr_readw(q);
 460                             a ^= 0x0800;
 461                             scr_writew(a, q);
 462                             q++;
 463                         }
 464                 } else if (vc->vc_hi_font_mask == 0x100) {
 465                         while (cnt--) {
 466                                 a = scr_readw(q);
 467                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 468                                 scr_writew(a, q);
 469                                 q++;
 470                         }
 471                 } else {
 472                         while (cnt--) {
 473                                 a = scr_readw(q);
 474                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 475                                 scr_writew(a, q);
 476                                 q++;
 477                         }
 478                 }
 479         }
 480 #endif
 481         if (DO_UPDATE(vc))
 482                 do_update_region(vc, (unsigned long) p, count);
 483 }
 484
 485 /* used by selection: complement pointer position */
 486 void complement_pos(struct vc_data *vc, int offset)
 487 {
 488         static int old_offset = -1;
 489         static unsigned short old;
 490         static unsigned short oldx, oldy;
 491
 492         WARN_CONSOLE_UNLOCKED();
 493
 494         if (old_offset != -1 && old_offset >= 0 &&
 495             old_offset < vc->vc_screenbuf_size) {
 496                 scr_writew(old, screenpos(vc, old_offset, 1));
 497                 if (DO_UPDATE(vc))
 498                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 499         }
 500
 501         old_offset = offset;
 502
 503         if (offset != -1 && offset >= 0 &&
 504             offset < vc->vc_screenbuf_size) {
 505                 unsigned short new;
 506                 unsigned short *p;
 507                 p = screenpos(vc, offset, 1);
 508                 old = scr_readw(p);
 509                 new = old ^ vc->vc_complement_mask;
 510                 scr_writew(new, p);
 511                 if (DO_UPDATE(vc)) {
 512                         oldx = (offset >> 1) % vc->vc_cols;
 513                         oldy = (offset >> 1) / vc->vc_cols;
 514                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 515                 }
 516         }
 517
 518 }
 519
 520 static void insert_char(struct vc_data *vc, unsigned int nr)
 521 {
 522         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 523
 524         p = q + vc->vc_cols - nr - vc->vc_x;
 525         while (--p >= q)
 526                 scr_writew(scr_readw(p), p + nr);
 527         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 528         vc->vc_need_wrap = 0;
 529         if (DO_UPDATE(vc)) {
 530                 unsigned short oldattr = vc->vc_attr;
 531                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 532                                      vc->vc_cols - vc->vc_x - nr);
 533                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 534                 while (nr--)
 535                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 536                 vc->vc_attr = oldattr;
 537         }
 538 }
 539
 540 static void delete_char(struct vc_data *vc, unsigned int nr)
 541 {
 542         unsigned int i = vc->vc_x;
 543         unsigned short *p = (unsigned short *)vc->vc_pos;
 544
 545         while (++i <= vc->vc_cols - nr) {
 546                 scr_writew(scr_readw(p+nr), p);
 547                 p++;
 548         }
 549         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 550         vc->vc_need_wrap = 0;
 551         if (DO_UPDATE(vc)) {
 552                 unsigned short oldattr = vc->vc_attr;
 553                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 554                                      vc->vc_cols - vc->vc_x - nr);
 555                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 556                 while (nr--)
 557                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 558                                      vc->vc_cols - 1 - nr);
 559                 vc->vc_attr = oldattr;
 560         }
 561 }
 562
 563 static int softcursor_original;
 564
 565 static void add_softcursor(struct vc_data *vc)
 566 {
 567         int i = scr_readw((u16 *) vc->vc_pos);
 568         u32 type = vc->vc_cursor_type;
 569
 570         if (! (type & 0x10)) return;
 571         if (softcursor_original != -1) return;
 572         softcursor_original = i;
 573         i |= ((type >> 8) & 0xff00 );
 574         i ^= ((type) & 0xff00 );
 575         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 576         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 577         scr_writew(i, (u16 *) vc->vc_pos);
 578         if (DO_UPDATE(vc))
 579                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 580 }
 581
 582 static void hide_softcursor(struct vc_data *vc)
 583 {
 584         if (softcursor_original != -1) {
 585                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 586                 if (DO_UPDATE(vc))
 587                         vc->vc_sw->con_putc(vc, softcursor_original,
 588                                         vc->vc_y, vc->vc_x);
 589                 softcursor_original = -1;
 590         }
 591 }
 592
 593 static void hide_cursor(struct vc_data *vc)
 594 {
 595         if (vc == sel_cons)
 596                 clear_selection();
 597         vc->vc_sw->con_cursor(vc, CM_ERASE);
 598         hide_softcursor(vc);
 599 }
 600
 601 static void set_cursor(struct vc_data *vc)
 602 {
 603         if (!IS_FG(vc) || console_blanked ||
 604             vc->vc_mode == KD_GRAPHICS)
 605                 return;
 606         if (vc->vc_deccm) {
 607                 if (vc == sel_cons)
 608                         clear_selection();
 609                 add_softcursor(vc);
 610                 if ((vc->vc_cursor_type & 0x0f) != 1)
 611                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 612         } else
 613                 hide_cursor(vc);
 614 }
 615
 616 static void set_origin(struct vc_data *vc)
 617 {
 618         WARN_CONSOLE_UNLOCKED();
 619
 620         if (!CON_IS_VISIBLE(vc) ||
 621             !vc->vc_sw->con_set_origin ||
 622             !vc->vc_sw->con_set_origin(vc))
 623                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 624         vc->vc_visible_origin = vc->vc_origin;
 625         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 626         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 627 }
 628
 629 static inline void save_screen(struct vc_data *vc)
 630 {
 631         WARN_CONSOLE_UNLOCKED();
 632
 633         if (vc->vc_sw->con_save_screen)
 634                 vc->vc_sw->con_save_screen(vc);
 635 }
 636
 637 /*
 638  *      Redrawing of screen
 639  */
 640
 641 static void clear_buffer_attributes(struct vc_data *vc)
 642 {
 643         unsigned short *p = (unsigned short *)vc->vc_origin;
 644         int count = vc->vc_screenbuf_size / 2;
 645         int mask = vc->vc_hi_font_mask | 0xff;
 646
 647         for (; count > 0; count--, p++) {
 648                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 649         }
 650 }
 651
 652 void redraw_screen(struct vc_data *vc, int is_switch)
 653 {
 654         int redraw = 0;
 655
 656         WARN_CONSOLE_UNLOCKED();
 657
 658         if (!vc) {
 659                 /* strange ... */
 660                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 661                 return;
 662         }
 663
 664         if (is_switch) {
 665                 struct vc_data *old_vc = vc_cons[fg_console].d;
 666                 if (old_vc == vc)
 667                         return;
 668                 if (!CON_IS_VISIBLE(vc))
 669                         redraw = 1;
 670                 *vc->vc_display_fg = vc;
 671                 fg_console = vc->vc_num;
 672                 hide_cursor(old_vc);
 673                 if (!CON_IS_VISIBLE(old_vc)) {
 674                         save_screen(old_vc);
 675                         set_origin(old_vc);
 676                 }
 677         } else {
 678                 hide_cursor(vc);
 679                 redraw = 1;
 680         }
 681
 682         if (redraw) {
 683                 int update;
 684                 int old_was_color = vc->vc_can_do_color;
 685
 686                 set_origin(vc);
 687                 update = vc->vc_sw->con_switch(vc);
 688                 set_palette(vc);
 689                 /*
 690                  * If console changed from mono<->color, the best we can do
 691                  * is to clear the buffer attributes. As it currently stands,
 692                  * rebuilding new attributes from the old buffer is not doable
 693                  * without overly complex code.
 694                  */
 695                 if (old_was_color != vc->vc_can_do_color) {
 696                         update_attr(vc);
 697                         clear_buffer_attributes(vc);
 698                 }
 699                 if (update && vc->vc_mode != KD_GRAPHICS)
 700                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 701         }
 702         set_cursor(vc);
 703         if (is_switch) {
 704                 set_leds();
 705                 compute_shiftstate();
 706                 notify_update(vc);
 707         }
 708 }
 709
 710 /*
 711  *      Allocation, freeing and resizing of VTs.
 712  */
 713
 714 int vc_cons_allocated(unsigned int i)
 715 {
 716         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 717 }
 718
 719 static void visual_init(struct vc_data *vc, int num, int init)
 720 {
 721         /* ++Geert: vc->vc_sw->con_init determines console size */
 722         if (vc->vc_sw)
 723                 module_put(vc->vc_sw->owner);
 724         vc->vc_sw = conswitchp;
 725 #ifndef VT_SINGLE_DRIVER
 726         if (con_driver_map[num])
 727                 vc->vc_sw = con_driver_map[num];
 728 #endif
 729         __module_get(vc->vc_sw->owner);
 730         vc->vc_num = num;
 731         vc->vc_display_fg = &master_display_fg;
 732         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 733         vc->vc_uni_pagedir = 0;
 734         vc->vc_hi_font_mask = 0;
 735         vc->vc_complement_mask = 0;
 736         vc->vc_can_do_color = 0;
 737         vc->vc_sw->con_init(vc, init);
 738         if (!vc->vc_complement_mask)
 739                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 740         vc->vc_s_complement_mask = vc->vc_complement_mask;
 741         vc->vc_size_row = vc->vc_cols << 1;
 742         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 743 }
 744
 745 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 746 {
 747         WARN_CONSOLE_UNLOCKED();
 748
 749         if (currcons >= MAX_NR_CONSOLES)
 750                 return -ENXIO;
 751         if (!vc_cons[currcons].d) {
 752             struct vc_data *vc;
 753             struct vt_notifier_param param;
 754
 755             /* prevent users from taking too much memory */
 756             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 757               return -EPERM;
 758
 759             /* due to the granularity of kmalloc, we waste some memory here */
 760             /* the alloc is done in two steps, to optimize the common situation
 761                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 762             /* although the numbers above are not valid since long ago, the
 763                point is still up-to-date and the comment still has its value
 764                even if only as a historical artifact.  --mj, July 1998 */
 765             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 766             if (!vc)
 767                 return -ENOMEM;
 768             vc_cons[currcons].d = vc;
 769             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 770             visual_init(vc, currcons, 1);
 771             if (!*vc->vc_uni_pagedir_loc)
 772                 con_set_default_unimap(vc);
 773             if (!vc->vc_kmalloced)
 774                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 775             if (!vc->vc_screenbuf) {
 776                 kfree(vc);
 777                 vc_cons[currcons].d = NULL;
 778                 return -ENOMEM;
 779             }
 780             vc->vc_kmalloced = 1;
 781             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 782             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 783         }
 784         return 0;
 785 }
 786
 787 static inline int resize_screen(struct vc_data *vc, int width, int height,
 788                                 int user)
 789 {
 790         /* Resizes the resolution of the display adapater */
 791         int err = 0;
 792
 793         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 794                 err = vc->vc_sw->con_resize(vc, width, height, user);
 795
 796         return err;
 797 }
 798
 799 /*
 800  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 801  * [this is to be used together with some user program
 802  * like resize that changes the hardware videomode]
 803  */
 804 #define VC_RESIZE_MAXCOL (32767)
 805 #define VC_RESIZE_MAXROW (32767)
 806
 807 /**
 808  *      vc_do_resize    -       resizing method for the tty
 809  *      @tty: tty being resized
 810  *      @real_tty: real tty (different to tty if a pty/tty pair)
 811  *      @vc: virtual console private data
 812  *      @cols: columns
 813  *      @lines: lines
 814  *
 815  *      Resize a virtual console, clipping according to the actual constraints.
 816  *      If the caller passes a tty structure then update the termios winsize
 817  *      information and perform any neccessary signal handling.
 818  *
 819  *      Caller must hold the console semaphore. Takes the termios mutex and
 820  *      ctrl_lock of the tty IFF a tty is passed.
 821  */
 822
 823 static int vc_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
 824                 struct vc_data *vc, unsigned int cols, unsigned int lines)
 825 {
 826         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 827         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 828         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 829         unsigned int end, user;
 830         unsigned short *newscreen;
 831
 832         WARN_CONSOLE_UNLOCKED();
 833
 834         if (!vc)
 835                 return -ENXIO;
 836
 837         user = vc->vc_resize_user;
 838         vc->vc_resize_user = 0;
 839
 840         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 841                 return -EINVAL;
 842
 843         new_cols = (cols ? cols : vc->vc_cols);
 844         new_rows = (lines ? lines : vc->vc_rows);
 845         new_row_size = new_cols << 1;
 846         new_screen_size = new_row_size * new_rows;
 847
 848         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 849                 return 0;
 850
 851         newscreen = kmalloc(new_screen_size, GFP_USER);
 852         if (!newscreen)
 853                 return -ENOMEM;
 854
 855         old_rows = vc->vc_rows;
 856         old_cols = vc->vc_cols;
 857         old_row_size = vc->vc_size_row;
 858         old_screen_size = vc->vc_screenbuf_size;
 859
 860         err = resize_screen(vc, new_cols, new_rows, user);
 861         if (err) {
 862                 kfree(newscreen);
 863                 return err;
 864         }
 865
 866         vc->vc_rows = new_rows;
 867         vc->vc_cols = new_cols;
 868         vc->vc_size_row = new_row_size;
 869         vc->vc_screenbuf_size = new_screen_size;
 870
 871         rlth = min(old_row_size, new_row_size);
 872         rrem = new_row_size - rlth;
 873         old_origin = vc->vc_origin;
 874         new_origin = (long) newscreen;
 875         new_scr_end = new_origin + new_screen_size;
 876
 877         if (vc->vc_y > new_rows) {
 878                 if (old_rows - vc->vc_y < new_rows) {
 879                         /*
 880                          * Cursor near the bottom, copy contents from the
 881                          * bottom of buffer
 882                          */
 883                         old_origin += (old_rows - new_rows) * old_row_size;
 884                         end = vc->vc_scr_end;
 885                 } else {
 886                         /*
 887                          * Cursor is in no man's land, copy 1/2 screenful
 888                          * from the top and bottom of cursor position
 889                          */
 890                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 891                         end = old_origin + (old_row_size * new_rows);
 892                 }
 893         } else
 894                 /*
 895                  * Cursor near the top, copy contents from the top of buffer
 896                  */
 897                 end = (old_rows > new_rows) ? old_origin +
 898                         (old_row_size * new_rows) :
 899                         vc->vc_scr_end;
 900
 901         update_attr(vc);
 902
 903         while (old_origin < end) {
 904                 scr_memcpyw((unsigned short *) new_origin,
 905                             (unsigned short *) old_origin, rlth);
 906                 if (rrem)
 907                         scr_memsetw((void *)(new_origin + rlth),
 908                                     vc->vc_video_erase_char, rrem);
 909                 old_origin += old_row_size;
 910                 new_origin += new_row_size;
 911         }
 912         if (new_scr_end > new_origin)
 913                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 914                             new_scr_end - new_origin);
 915         if (vc->vc_kmalloced)
 916                 kfree(vc->vc_screenbuf);
 917         vc->vc_screenbuf = newscreen;
 918         vc->vc_kmalloced = 1;
 919         vc->vc_screenbuf_size = new_screen_size;
 920         set_origin(vc);
 921
 922         /* do part of a reset_terminal() */
 923         vc->vc_top = 0;
 924         vc->vc_bottom = vc->vc_rows;
 925         gotoxy(vc, vc->vc_x, vc->vc_y);
 926         save_cur(vc);
 927
 928         if (tty) {
 929                 /* Rewrite the requested winsize data with the actual
 930                    resulting sizes */
 931                 struct winsize ws;
 932                 memset(&ws, 0, sizeof(ws));
 933                 ws.ws_row = vc->vc_rows;
 934                 ws.ws_col = vc->vc_cols;
 935                 ws.ws_ypixel = vc->vc_scan_lines;
 936                 tty_do_resize(tty, real_tty, &ws);
 937         }
 938
 939         if (CON_IS_VISIBLE(vc))
 940                 update_screen(vc);
 941         return err;
 942 }
 943
 944 /**
 945  *      vc_resize               -       resize a VT
 946  *      @vc: virtual console
 947  *      @cols: columns
 948  *      @rows: rows
 949  *
 950  *      Resize a virtual console as seen from the console end of things. We
 951  *      use the common vc_do_resize methods to update the structures. The
 952  *      caller must hold the console sem to protect console internals and
 953  *      vc->vc_tty
 954  */
 955
 956 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 957 {
 958         return vc_do_resize(vc->vc_tty, vc->vc_tty, vc, cols, rows);
 959 }
 960
 961 /**
 962  *      vt_resize               -       resize a VT
 963  *      @tty: tty to resize
 964  *      @real_tty: tty if a pty/tty pair
 965  *      @ws: winsize attributes
 966  *
 967  *      Resize a virtual terminal. This is called by the tty layer as we
 968  *      register our own handler for resizing. The mutual helper does all
 969  *      the actual work.
 970  *
 971  *      Takes the console sem and the called methods then take the tty
 972  *      termios_mutex and the tty ctrl_lock in that order.
 973  */
 974
 975 int vt_resize(struct tty_struct *tty, struct tty_struct *real_tty,
 976         struct winsize *ws)
 977 {
 978         struct vc_data *vc = tty->driver_data;
 979         int ret;
 980
 981         acquire_console_sem();
 982         ret = vc_do_resize(tty, real_tty, vc, ws->ws_col, ws->ws_row);
 983         release_console_sem();
 984         return ret;
 985 }
 986
 987 void vc_deallocate(unsigned int currcons)
 988 {
 989         WARN_CONSOLE_UNLOCKED();
 990
 991         if (vc_cons_allocated(currcons)) {
 992                 struct vc_data *vc = vc_cons[currcons].d;
 993                 struct vt_notifier_param param = { .vc = vc };
 994                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 995                 vc->vc_sw->con_deinit(vc);
 996                 put_pid(vc->vt_pid);
 997                 module_put(vc->vc_sw->owner);
 998                 if (vc->vc_kmalloced)
 999                         kfree(vc->vc_screenbuf);
1000                 if (currcons >= MIN_NR_CONSOLES)
1001                         kfree(vc);
1002                 vc_cons[currcons].d = NULL;
1003         }
1004 }
1005
1006 /*
1007  *      VT102 emulator
1008  */
1009
1010 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1011 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1012 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1013
1014 #define decarm          VC_REPEAT
1015 #define decckm          VC_CKMODE
1016 #define kbdapplic       VC_APPLIC
1017 #define lnm             VC_CRLF
1018
1019 /*
1020  * this is what the terminal answers to a ESC-Z or csi0c query.
1021  */
1022 #define VT100ID "\033[?1;2c"
1023 #define VT102ID "\033[?6c"
1024
1025 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1026                                        8,12,10,14, 9,13,11,15 };
1027
1028 /* the default colour table, for VGA+ colour systems */
1029 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1030     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1031 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1032     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1033 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1034     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1035
1036 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1037 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1038 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1039
1040 /*
1041  * gotoxy() must verify all boundaries, because the arguments
1042  * might also be negative. If the given position is out of
1043  * bounds, the cursor is placed at the nearest margin.
1044  */
1045 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1046 {
1047         int min_y, max_y;
1048
1049         if (new_x < 0)
1050                 vc->vc_x = 0;
1051         else {
1052                 if (new_x >= vc->vc_cols)
1053                         vc->vc_x = vc->vc_cols - 1;
1054                 else
1055                         vc->vc_x = new_x;
1056         }
1057
1058         if (vc->vc_decom) {
1059                 min_y = vc->vc_top;
1060                 max_y = vc->vc_bottom;
1061         } else {
1062                 min_y = 0;
1063                 max_y = vc->vc_rows;
1064         }
1065         if (new_y < min_y)
1066                 vc->vc_y = min_y;
1067         else if (new_y >= max_y)
1068                 vc->vc_y = max_y - 1;
1069         else
1070                 vc->vc_y = new_y;
1071         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1072         vc->vc_need_wrap = 0;
1073 }
1074
1075 /* for absolute user moves, when decom is set */
1076 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1077 {
1078         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1079 }
1080
1081 void scrollback(struct vc_data *vc, int lines)
1082 {
1083         if (!lines)
1084                 lines = vc->vc_rows / 2;
1085         scrolldelta(-lines);
1086 }
1087
1088 void scrollfront(struct vc_data *vc, int lines)
1089 {
1090         if (!lines)
1091                 lines = vc->vc_rows / 2;
1092         scrolldelta(lines);
1093 }
1094
1095 static void lf(struct vc_data *vc)
1096 {
1097         /* don't scroll if above bottom of scrolling region, or
1098          * if below scrolling region
1099          */
1100         if (vc->vc_y + 1 == vc->vc_bottom)
1101                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1102         else if (vc->vc_y < vc->vc_rows - 1) {
1103                 vc->vc_y++;
1104                 vc->vc_pos += vc->vc_size_row;
1105         }
1106         vc->vc_need_wrap = 0;
1107         notify_write(vc, '\n');
1108 }
1109
1110 static void ri(struct vc_data *vc)
1111 {
1112         /* don't scroll if below top of scrolling region, or
1113          * if above scrolling region
1114          */
1115         if (vc->vc_y == vc->vc_top)
1116                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1117         else if (vc->vc_y > 0) {
1118                 vc->vc_y--;
1119                 vc->vc_pos -= vc->vc_size_row;
1120         }
1121         vc->vc_need_wrap = 0;
1122 }
1123
1124 static inline void cr(struct vc_data *vc)
1125 {
1126         vc->vc_pos -= vc->vc_x << 1;
1127         vc->vc_need_wrap = vc->vc_x = 0;
1128         notify_write(vc, '\r');
1129 }
1130
1131 static inline void bs(struct vc_data *vc)
1132 {
1133         if (vc->vc_x) {
1134                 vc->vc_pos -= 2;
1135                 vc->vc_x--;
1136                 vc->vc_need_wrap = 0;
1137                 notify_write(vc, '\b');
1138         }
1139 }
1140
1141 static inline void del(struct vc_data *vc)
1142 {
1143         /* ignored */
1144 }
1145
1146 static void csi_J(struct vc_data *vc, int vpar)
1147 {
1148         unsigned int count;
1149         unsigned short * start;
1150
1151         switch (vpar) {
1152                 case 0: /* erase from cursor to end of display */
1153                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1154                         start = (unsigned short *)vc->vc_pos;
1155                         if (DO_UPDATE(vc)) {
1156                                 /* do in two stages */
1157                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1158                                               vc->vc_cols - vc->vc_x);
1159                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1160                                               vc->vc_rows - vc->vc_y - 1,
1161                                               vc->vc_cols);
1162                         }
1163                         break;
1164                 case 1: /* erase from start to cursor */
1165                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1166                         start = (unsigned short *)vc->vc_origin;
1167                         if (DO_UPDATE(vc)) {
1168                                 /* do in two stages */
1169                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1170                                               vc->vc_cols);
1171                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1172                                               vc->vc_x + 1);
1173                         }
1174                         break;
1175                 case 2: /* erase whole display */
1176                         count = vc->vc_cols * vc->vc_rows;
1177                         start = (unsigned short *)vc->vc_origin;
1178                         if (DO_UPDATE(vc))
1179                                 vc->vc_sw->con_clear(vc, 0, 0,
1180                                               vc->vc_rows,
1181                                               vc->vc_cols);
1182                         break;
1183                 default:
1184                         return;
1185         }
1186         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1187         vc->vc_need_wrap = 0;
1188 }
1189
1190 static void csi_K(struct vc_data *vc, int vpar)
1191 {
1192         unsigned int count;
1193         unsigned short * start;
1194
1195         switch (vpar) {
1196                 case 0: /* erase from cursor to end of line */
1197                         count = vc->vc_cols - vc->vc_x;
1198                         start = (unsigned short *)vc->vc_pos;
1199                         if (DO_UPDATE(vc))
1200                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1201                                                      vc->vc_cols - vc->vc_x);
1202                         break;
1203                 case 1: /* erase from start of line to cursor */
1204                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1205                         count = vc->vc_x + 1;
1206                         if (DO_UPDATE(vc))
1207                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1208                                                      vc->vc_x + 1);
1209                         break;
1210                 case 2: /* erase whole line */
1211                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1212                         count = vc->vc_cols;
1213                         if (DO_UPDATE(vc))
1214                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1215                                               vc->vc_cols);
1216                         break;
1217                 default:
1218                         return;
1219         }
1220         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1221         vc->vc_need_wrap = 0;
1222 }
1223
1224 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1225 {                                         /* not vt100? */
1226         int count;
1227
1228         if (!vpar)
1229                 vpar++;
1230         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1231
1232         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1233         if (DO_UPDATE(vc))
1234                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1235         vc->vc_need_wrap = 0;
1236 }
1237
1238 static void default_attr(struct vc_data *vc)
1239 {
1240         vc->vc_intensity = 1;
1241         vc->vc_italic = 0;
1242         vc->vc_underline = 0;
1243         vc->vc_reverse = 0;
1244         vc->vc_blink = 0;
1245         vc->vc_color = vc->vc_def_color;
1246 }
1247
1248 /* console_sem is held */
1249 static void csi_m(struct vc_data *vc)
1250 {
1251         int i;
1252
1253         for (i = 0; i <= vc->vc_npar; i++)
1254                 switch (vc->vc_par[i]) {
1255                         case 0: /* all attributes off */
1256                                 default_attr(vc);
1257                                 break;
1258                         case 1:
1259                                 vc->vc_intensity = 2;
1260                                 break;
1261                         case 2:
1262                                 vc->vc_intensity = 0;
1263                                 break;
1264                         case 3:
1265                                 vc->vc_italic = 1;
1266                                 break;
1267                         case 4:
1268                                 vc->vc_underline = 1;
1269                                 break;
1270                         case 5:
1271                                 vc->vc_blink = 1;
1272                                 break;
1273                         case 7:
1274                                 vc->vc_reverse = 1;
1275                                 break;
1276                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1277                                   * Select primary font, don't display
1278                                   * control chars if defined, don't set
1279                                   * bit 8 on output.
1280                                   */
1281                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1282                                                 ? vc->vc_G0_charset
1283                                                 : vc->vc_G1_charset, vc);
1284                                 vc->vc_disp_ctrl = 0;
1285                                 vc->vc_toggle_meta = 0;
1286                                 break;
1287                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1288                                   * Select first alternate font, lets
1289                                   * chars < 32 be displayed as ROM chars.
1290                                   */
1291                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1292                                 vc->vc_disp_ctrl = 1;
1293                                 vc->vc_toggle_meta = 0;
1294                                 break;
1295                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1296                                   * Select second alternate font, toggle
1297                                   * high bit before displaying as ROM char.
1298                                   */
1299                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1300                                 vc->vc_disp_ctrl = 1;
1301                                 vc->vc_toggle_meta = 1;
1302                                 break;
1303                         case 21:
1304                         case 22:
1305                                 vc->vc_intensity = 1;
1306                                 break;
1307                         case 23:
1308                                 vc->vc_italic = 0;
1309                                 break;
1310                         case 24:
1311                                 vc->vc_underline = 0;
1312                                 break;
1313                         case 25:
1314                                 vc->vc_blink = 0;
1315                                 break;
1316                         case 27:
1317                                 vc->vc_reverse = 0;
1318                                 break;
1319                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1320                                   * Enables underscore, white foreground
1321                                   * with white underscore (Linux - use
1322                                   * default foreground).
1323                                   */
1324                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1325                                 vc->vc_underline = 1;
1326                                 break;
1327                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1328                                   * Disable underline option.
1329                                   * Reset colour to default? It did this
1330                                   * before...
1331                                   */
1332                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1333                                 vc->vc_underline = 0;
1334                                 break;
1335                         case 49:
1336                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1337                                 break;
1338                         default:
1339                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1340                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1341                                                 | (vc->vc_color & 0xf0);
1342                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1343                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1344                                                 | (vc->vc_color & 0x0f);
1345                                 break;
1346                 }
1347         update_attr(vc);
1348 }
1349
1350 static void respond_string(const char *p, struct tty_struct *tty)
1351 {
1352         while (*p) {
1353                 tty_insert_flip_char(tty, *p, 0);
1354                 p++;
1355         }
1356         con_schedule_flip(tty);
1357 }
1358
1359 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1360 {
1361         char buf[40];
1362
1363         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1364         respond_string(buf, tty);
1365 }
1366
1367 static inline void status_report(struct tty_struct *tty)
1368 {
1369         respond_string("\033[0n", tty); /* Terminal ok */
1370 }
1371
1372 static inline void respond_ID(struct tty_struct * tty)
1373 {
1374         respond_string(VT102ID, tty);
1375 }
1376
1377 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1378 {
1379         char buf[8];
1380
1381         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1382                 (char)('!' + mry));
1383         respond_string(buf, tty);
1384 }
1385
1386 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1387 int mouse_reporting(void)
1388 {
1389         return vc_cons[fg_console].d->vc_report_mouse;
1390 }
1391
1392 /* console_sem is held */
1393 static void set_mode(struct vc_data *vc, int on_off)
1394 {
1395         int i;
1396
1397         for (i = 0; i <= vc->vc_npar; i++)
1398                 if (vc->vc_ques) {
1399                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1400                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1401                                 if (on_off)
1402                                         set_kbd(vc, decckm);
1403                                 else
1404                                         clr_kbd(vc, decckm);
1405                                 break;
1406                         case 3: /* 80/132 mode switch unimplemented */
1407                                 vc->vc_deccolm = on_off;
1408 #if 0
1409                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1410                                 /* this alone does not suffice; some user mode
1411                                    utility has to change the hardware regs */
1412 #endif
1413                                 break;
1414                         case 5:                 /* Inverted screen on/off */
1415                                 if (vc->vc_decscnm != on_off) {
1416                                         vc->vc_decscnm = on_off;
1417                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1418                                         update_attr(vc);
1419                                 }
1420                                 break;
1421                         case 6:                 /* Origin relative/absolute */
1422                                 vc->vc_decom = on_off;
1423                                 gotoxay(vc, 0, 0);
1424                                 break;
1425                         case 7:                 /* Autowrap on/off */
1426                                 vc->vc_decawm = on_off;
1427                                 break;
1428                         case 8:                 /* Autorepeat on/off */
1429                                 if (on_off)
1430                                         set_kbd(vc, decarm);
1431                                 else
1432                                         clr_kbd(vc, decarm);
1433                                 break;
1434                         case 9:
1435                                 vc->vc_report_mouse = on_off ? 1 : 0;
1436                                 break;
1437                         case 25:                /* Cursor on/off */
1438                                 vc->vc_deccm = on_off;
1439                                 break;
1440                         case 1000:
1441                                 vc->vc_report_mouse = on_off ? 2 : 0;
1442                                 break;
1443                         }
1444                 } else {
1445                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1446                         case 3:                 /* Monitor (display ctrls) */
1447                                 vc->vc_disp_ctrl = on_off;
1448                                 break;
1449                         case 4:                 /* Insert Mode on/off */
1450                                 vc->vc_decim = on_off;
1451                                 break;
1452                         case 20:                /* Lf, Enter == CrLf/Lf */
1453                                 if (on_off)
1454                                         set_kbd(vc, lnm);
1455                                 else
1456                                         clr_kbd(vc, lnm);
1457                                 break;
1458                         }
1459                 }
1460 }
1461
1462 /* console_sem is held */
1463 static void setterm_command(struct vc_data *vc)
1464 {
1465         switch(vc->vc_par[0]) {
1466                 case 1: /* set color for underline mode */
1467                         if (vc->vc_can_do_color &&
1468                                         vc->vc_par[1] < 16) {
1469                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1470                                 if (vc->vc_underline)
1471                                         update_attr(vc);
1472                         }
1473                         break;
1474                 case 2: /* set color for half intensity mode */
1475                         if (vc->vc_can_do_color &&
1476                                         vc->vc_par[1] < 16) {
1477                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1478                                 if (vc->vc_intensity == 0)
1479                                         update_attr(vc);
1480                         }
1481                         break;
1482                 case 8: /* store colors as defaults */
1483                         vc->vc_def_color = vc->vc_attr;
1484                         if (vc->vc_hi_font_mask == 0x100)
1485                                 vc->vc_def_color >>= 1;
1486                         default_attr(vc);
1487                         update_attr(vc);
1488                         break;
1489                 case 9: /* set blanking interval */
1490                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1491                         poke_blanked_console();
1492                         break;
1493                 case 10: /* set bell frequency in Hz */
1494                         if (vc->vc_npar >= 1)
1495                                 vc->vc_bell_pitch = vc->vc_par[1];
1496                         else
1497                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1498                         break;
1499                 case 11: /* set bell duration in msec */
1500                         if (vc->vc_npar >= 1)
1501                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1502                                         vc->vc_par[1] * HZ / 1000 : 0;
1503                         else
1504                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1505                         break;
1506                 case 12: /* bring specified console to the front */
1507                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1508                                 set_console(vc->vc_par[1] - 1);
1509                         break;
1510                 case 13: /* unblank the screen */
1511                         poke_blanked_console();
1512                         break;
1513                 case 14: /* set vesa powerdown interval */
1514                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1515                         break;
1516                 case 15: /* activate the previous console */
1517                         set_console(last_console);
1518                         break;
1519         }
1520 }
1521
1522 /* console_sem is held */
1523 static void csi_at(struct vc_data *vc, unsigned int nr)
1524 {
1525         if (nr > vc->vc_cols - vc->vc_x)
1526                 nr = vc->vc_cols - vc->vc_x;
1527         else if (!nr)
1528                 nr = 1;
1529         insert_char(vc, nr);
1530 }
1531
1532 /* console_sem is held */
1533 static void csi_L(struct vc_data *vc, unsigned int nr)
1534 {
1535         if (nr > vc->vc_rows - vc->vc_y)
1536                 nr = vc->vc_rows - vc->vc_y;
1537         else if (!nr)
1538                 nr = 1;
1539         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1540         vc->vc_need_wrap = 0;
1541 }
1542
1543 /* console_sem is held */
1544 static void csi_P(struct vc_data *vc, unsigned int nr)
1545 {
1546         if (nr > vc->vc_cols - vc->vc_x)
1547                 nr = vc->vc_cols - vc->vc_x;
1548         else if (!nr)
1549                 nr = 1;
1550         delete_char(vc, nr);
1551 }
1552
1553 /* console_sem is held */
1554 static void csi_M(struct vc_data *vc, unsigned int nr)
1555 {
1556         if (nr > vc->vc_rows - vc->vc_y)
1557                 nr = vc->vc_rows - vc->vc_y;
1558         else if (!nr)
1559                 nr=1;
1560         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1561         vc->vc_need_wrap = 0;
1562 }
1563
1564 /* console_sem is held (except via vc_init->reset_terminal */
1565 static void save_cur(struct vc_data *vc)
1566 {
1567         vc->vc_saved_x          = vc->vc_x;
1568         vc->vc_saved_y          = vc->vc_y;
1569         vc->vc_s_intensity      = vc->vc_intensity;
1570         vc->vc_s_italic         = vc->vc_italic;
1571         vc->vc_s_underline      = vc->vc_underline;
1572         vc->vc_s_blink          = vc->vc_blink;
1573         vc->vc_s_reverse        = vc->vc_reverse;
1574         vc->vc_s_charset        = vc->vc_charset;
1575         vc->vc_s_color          = vc->vc_color;
1576         vc->vc_saved_G0         = vc->vc_G0_charset;
1577         vc->vc_saved_G1         = vc->vc_G1_charset;
1578 }
1579
1580 /* console_sem is held */
1581 static void restore_cur(struct vc_data *vc)
1582 {
1583         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1584         vc->vc_intensity        = vc->vc_s_intensity;
1585         vc->vc_italic           = vc->vc_s_italic;
1586         vc->vc_underline        = vc->vc_s_underline;
1587         vc->vc_blink            = vc->vc_s_blink;
1588         vc->vc_reverse          = vc->vc_s_reverse;
1589         vc->vc_charset          = vc->vc_s_charset;
1590         vc->vc_color            = vc->vc_s_color;
1591         vc->vc_G0_charset       = vc->vc_saved_G0;
1592         vc->vc_G1_charset       = vc->vc_saved_G1;
1593         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1594         update_attr(vc);
1595         vc->vc_need_wrap = 0;
1596 }
1597
1598 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1599         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1600         ESpalette };
1601
1602 /* console_sem is held (except via vc_init()) */
1603 static void reset_terminal(struct vc_data *vc, int do_clear)
1604 {
1605         vc->vc_top              = 0;
1606         vc->vc_bottom           = vc->vc_rows;
1607         vc->vc_state            = ESnormal;
1608         vc->vc_ques             = 0;
1609         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1610         vc->vc_G0_charset       = LAT1_MAP;
1611         vc->vc_G1_charset       = GRAF_MAP;
1612         vc->vc_charset          = 0;
1613         vc->vc_need_wrap        = 0;
1614         vc->vc_report_mouse     = 0;
1615         vc->vc_utf              = default_utf8;
1616         vc->vc_utf_count        = 0;
1617
1618         vc->vc_disp_ctrl        = 0;
1619         vc->vc_toggle_meta      = 0;
1620
1621         vc->vc_decscnm          = 0;
1622         vc->vc_decom            = 0;
1623         vc->vc_decawm           = 1;
1624         vc->vc_deccm            = 1;
1625         vc->vc_decim            = 0;
1626
1627         set_kbd(vc, decarm);
1628         clr_kbd(vc, decckm);
1629         clr_kbd(vc, kbdapplic);
1630         clr_kbd(vc, lnm);
1631         kbd_table[vc->vc_num].lockstate = 0;
1632         kbd_table[vc->vc_num].slockstate = 0;
1633         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1634         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1635         /* do not do set_leds here because this causes an endless tasklet loop
1636            when the keyboard hasn't been initialized yet */
1637
1638         vc->vc_cursor_type = CUR_DEFAULT;
1639         vc->vc_complement_mask = vc->vc_s_complement_mask;
1640
1641         default_attr(vc);
1642         update_attr(vc);
1643
1644         vc->vc_tab_stop[0]      = 0x01010100;
1645         vc->vc_tab_stop[1]      =
1646         vc->vc_tab_stop[2]      =
1647         vc->vc_tab_stop[3]      =
1648         vc->vc_tab_stop[4]      = 0x01010101;
1649
1650         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1651         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1652
1653         gotoxy(vc, 0, 0);
1654         save_cur(vc);
1655         if (do_clear)
1656             csi_J(vc, 2);
1657 }
1658
1659 /* console_sem is held */
1660 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1661 {
1662         /*
1663          *  Control characters can be used in the _middle_
1664          *  of an escape sequence.
1665          */
1666         switch (c) {
1667         case 0:
1668                 return;
1669         case 7:
1670                 if (vc->vc_bell_duration)
1671                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1672                 return;
1673         case 8:
1674                 bs(vc);
1675                 return;
1676         case 9:
1677                 vc->vc_pos -= (vc->vc_x << 1);
1678                 while (vc->vc_x < vc->vc_cols - 1) {
1679                         vc->vc_x++;
1680                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1681                                 break;
1682                 }
1683                 vc->vc_pos += (vc->vc_x << 1);
1684                 notify_write(vc, '\t');
1685                 return;
1686         case 10: case 11: case 12:
1687                 lf(vc);
1688                 if (!is_kbd(vc, lnm))
1689                         return;
1690         case 13:
1691                 cr(vc);
1692                 return;
1693         case 14:
1694                 vc->vc_charset = 1;
1695                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1696                 vc->vc_disp_ctrl = 1;
1697                 return;
1698         case 15:
1699                 vc->vc_charset = 0;
1700                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1701                 vc->vc_disp_ctrl = 0;
1702                 return;
1703         case 24: case 26:
1704                 vc->vc_state = ESnormal;
1705                 return;
1706         case 27:
1707                 vc->vc_state = ESesc;
1708                 return;
1709         case 127:
1710                 del(vc);
1711                 return;
1712         case 128+27:
1713                 vc->vc_state = ESsquare;
1714                 return;
1715         }
1716         switch(vc->vc_state) {
1717         case ESesc:
1718                 vc->vc_state = ESnormal;
1719                 switch (c) {
1720                 case '[':
1721                         vc->vc_state = ESsquare;
1722                         return;
1723                 case ']':
1724                         vc->vc_state = ESnonstd;
1725                         return;
1726                 case '%':
1727                         vc->vc_state = ESpercent;
1728                         return;
1729                 case 'E':
1730                         cr(vc);
1731                         lf(vc);
1732                         return;
1733                 case 'M':
1734                         ri(vc);
1735                         return;
1736                 case 'D':
1737                         lf(vc);
1738                         return;
1739                 case 'H':
1740                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1741                         return;
1742                 case 'Z':
1743                         respond_ID(tty);
1744                         return;
1745                 case '7':
1746                         save_cur(vc);
1747                         return;
1748                 case '8':
1749                         restore_cur(vc);
1750                         return;
1751                 case '(':
1752                         vc->vc_state = ESsetG0;
1753                         return;
1754                 case ')':
1755                         vc->vc_state = ESsetG1;
1756                         return;
1757                 case '#':
1758                         vc->vc_state = EShash;
1759                         return;
1760                 case 'c':
1761                         reset_terminal(vc, 1);
1762                         return;
1763                 case '>':  /* Numeric keypad */
1764                         clr_kbd(vc, kbdapplic);
1765                         return;
1766                 case '=':  /* Appl. keypad */
1767                         set_kbd(vc, kbdapplic);
1768                         return;
1769                 }
1770                 return;
1771         case ESnonstd:
1772                 if (c=='P') {   /* palette escape sequence */
1773                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1774                                 vc->vc_par[vc->vc_npar] = 0;
1775                         vc->vc_npar = 0;
1776                         vc->vc_state = ESpalette;
1777                         return;
1778                 } else if (c=='R') {   /* reset palette */
1779                         reset_palette(vc);
1780                         vc->vc_state = ESnormal;
1781                 } else
1782                         vc->vc_state = ESnormal;
1783                 return;
1784         case ESpalette:
1785                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1786                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1787                         if (vc->vc_npar == 7) {
1788                                 int i = vc->vc_par[0] * 3, j = 1;
1789                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1790                                 vc->vc_palette[i++] += vc->vc_par[j++];
1791                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1792                                 vc->vc_palette[i++] += vc->vc_par[j++];
1793                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1794                                 vc->vc_palette[i] += vc->vc_par[j];
1795                                 set_palette(vc);
1796                                 vc->vc_state = ESnormal;
1797                         }
1798                 } else
1799                         vc->vc_state = ESnormal;
1800                 return;
1801         case ESsquare:
1802                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1803                         vc->vc_par[vc->vc_npar] = 0;
1804                 vc->vc_npar = 0;
1805                 vc->vc_state = ESgetpars;
1806                 if (c == '[') { /* Function key */
1807                         vc->vc_state=ESfunckey;
1808                         return;
1809                 }
1810                 vc->vc_ques = (c == '?');
1811                 if (vc->vc_ques)
1812                         return;
1813         case ESgetpars:
1814                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1815                         vc->vc_npar++;
1816                         return;
1817                 } else if (c>='0' && c<='9') {
1818                         vc->vc_par[vc->vc_npar] *= 10;
1819                         vc->vc_par[vc->vc_npar] += c - '0';
1820                         return;
1821                 } else
1822                         vc->vc_state = ESgotpars;
1823         case ESgotpars:
1824                 vc->vc_state = ESnormal;
1825                 switch(c) {
1826                 case 'h':
1827                         set_mode(vc, 1);
1828                         return;
1829                 case 'l':
1830                         set_mode(vc, 0);
1831                         return;
1832                 case 'c':
1833                         if (vc->vc_ques) {
1834                                 if (vc->vc_par[0])
1835                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1836                                 else
1837                                         vc->vc_cursor_type = CUR_DEFAULT;
1838                                 return;
1839                         }
1840                         break;
1841                 case 'm':
1842                         if (vc->vc_ques) {
1843                                 clear_selection();
1844                                 if (vc->vc_par[0])
1845                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1846                                 else
1847                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1848                                 return;
1849                         }
1850                         break;
1851                 case 'n':
1852                         if (!vc->vc_ques) {
1853                                 if (vc->vc_par[0] == 5)
1854                                         status_report(tty);
1855                                 else if (vc->vc_par[0] == 6)
1856                                         cursor_report(vc, tty);
1857                         }
1858                         return;
1859                 }
1860                 if (vc->vc_ques) {
1861                         vc->vc_ques = 0;
1862                         return;
1863                 }
1864                 switch(c) {
1865                 case 'G': case '`':
1866                         if (vc->vc_par[0])
1867                                 vc->vc_par[0]--;
1868                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1869                         return;
1870                 case 'A':
1871                         if (!vc->vc_par[0])
1872                                 vc->vc_par[0]++;
1873                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1874                         return;
1875                 case 'B': case 'e':
1876                         if (!vc->vc_par[0])
1877                                 vc->vc_par[0]++;
1878                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1879                         return;
1880                 case 'C': case 'a':
1881                         if (!vc->vc_par[0])
1882                                 vc->vc_par[0]++;
1883                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1884                         return;
1885                 case 'D':
1886                         if (!vc->vc_par[0])
1887                                 vc->vc_par[0]++;
1888                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1889                         return;
1890                 case 'E':
1891                         if (!vc->vc_par[0])
1892                                 vc->vc_par[0]++;
1893                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1894                         return;
1895                 case 'F':
1896                         if (!vc->vc_par[0])
1897                                 vc->vc_par[0]++;
1898                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1899                         return;
1900                 case 'd':
1901                         if (vc->vc_par[0])
1902                                 vc->vc_par[0]--;
1903                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1904                         return;
1905                 case 'H': case 'f':
1906                         if (vc->vc_par[0])
1907                                 vc->vc_par[0]--;
1908                         if (vc->vc_par[1])
1909                                 vc->vc_par[1]--;
1910                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1911                         return;
1912                 case 'J':
1913                         csi_J(vc, vc->vc_par[0]);
1914                         return;
1915                 case 'K':
1916                         csi_K(vc, vc->vc_par[0]);
1917                         return;
1918                 case 'L':
1919                         csi_L(vc, vc->vc_par[0]);
1920                         return;
1921                 case 'M':
1922                         csi_M(vc, vc->vc_par[0]);
1923                         return;
1924                 case 'P':
1925                         csi_P(vc, vc->vc_par[0]);
1926                         return;
1927                 case 'c':
1928                         if (!vc->vc_par[0])
1929                                 respond_ID(tty);
1930                         return;
1931                 case 'g':
1932                         if (!vc->vc_par[0])
1933                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1934                         else if (vc->vc_par[0] == 3) {
1935                                 vc->vc_tab_stop[0] =
1936                                         vc->vc_tab_stop[1] =
1937                                         vc->vc_tab_stop[2] =
1938                                         vc->vc_tab_stop[3] =
1939                                         vc->vc_tab_stop[4] = 0;
1940                         }
1941                         return;
1942                 case 'm':
1943                         csi_m(vc);
1944                         return;
1945                 case 'q': /* DECLL - but only 3 leds */
1946                         /* map 0,1,2,3 to 0,1,2,4 */
1947                         if (vc->vc_par[0] < 4)
1948                                 setledstate(kbd_table + vc->vc_num,
1949                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1950                         return;
1951                 case 'r':
1952                         if (!vc->vc_par[0])
1953                                 vc->vc_par[0]++;
1954                         if (!vc->vc_par[1])
1955                                 vc->vc_par[1] = vc->vc_rows;
1956                         /* Minimum allowed region is 2 lines */
1957                         if (vc->vc_par[0] < vc->vc_par[1] &&
1958                             vc->vc_par[1] <= vc->vc_rows) {
1959                                 vc->vc_top = vc->vc_par[0] - 1;
1960                                 vc->vc_bottom = vc->vc_par[1];
1961                                 gotoxay(vc, 0, 0);
1962                         }
1963                         return;
1964                 case 's':
1965                         save_cur(vc);
1966                         return;
1967                 case 'u':
1968                         restore_cur(vc);
1969                         return;
1970                 case 'X':
1971                         csi_X(vc, vc->vc_par[0]);
1972                         return;
1973                 case '@':
1974                         csi_at(vc, vc->vc_par[0]);
1975                         return;
1976                 case ']': /* setterm functions */
1977                         setterm_command(vc);
1978                         return;
1979                 }
1980                 return;
1981         case ESpercent:
1982                 vc->vc_state = ESnormal;
1983                 switch (c) {
1984                 case '@':  /* defined in ISO 2022 */
1985                         vc->vc_utf = 0;
1986                         return;
1987                 case 'G':  /* prelim official escape code */
1988                 case '8':  /* retained for compatibility */
1989                         vc->vc_utf = 1;
1990                         return;
1991                 }
1992                 return;
1993         case ESfunckey:
1994                 vc->vc_state = ESnormal;
1995                 return;
1996         case EShash:
1997                 vc->vc_state = ESnormal;
1998                 if (c == '8') {
1999                         /* DEC screen alignment test. kludge :-) */
2000                         vc->vc_video_erase_char =
2001                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2002                         csi_J(vc, 2);
2003                         vc->vc_video_erase_char =
2004                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2005                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2006                 }
2007                 return;
2008         case ESsetG0:
2009                 if (c == '0')
2010                         vc->vc_G0_charset = GRAF_MAP;
2011                 else if (c == 'B')
2012                         vc->vc_G0_charset = LAT1_MAP;
2013                 else if (c == 'U')
2014                         vc->vc_G0_charset = IBMPC_MAP;
2015                 else if (c == 'K')
2016                         vc->vc_G0_charset = USER_MAP;
2017                 if (vc->vc_charset == 0)
2018                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2019                 vc->vc_state = ESnormal;
2020                 return;
2021         case ESsetG1:
2022                 if (c == '0')
2023                         vc->vc_G1_charset = GRAF_MAP;
2024                 else if (c == 'B')
2025                         vc->vc_G1_charset = LAT1_MAP;
2026                 else if (c == 'U')
2027                         vc->vc_G1_charset = IBMPC_MAP;
2028                 else if (c == 'K')
2029                         vc->vc_G1_charset = USER_MAP;
2030                 if (vc->vc_charset == 1)
2031                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2032                 vc->vc_state = ESnormal;
2033                 return;
2034         default:
2035                 vc->vc_state = ESnormal;
2036         }
2037 }
2038
2039 /* This is a temporary buffer used to prepare a tty console write
2040  * so that we can easily avoid touching user space while holding the
2041  * console spinlock.  It is allocated in con_init and is shared by
2042  * this code and the vc_screen read/write tty calls.
2043  *
2044  * We have to allocate this statically in the kernel data section
2045  * since console_init (and thus con_init) are called before any
2046  * kernel memory allocation is available.
2047  */
2048 char con_buf[CON_BUF_SIZE];
2049 DEFINE_MUTEX(con_buf_mtx);
2050
2051 /* is_double_width() is based on the wcwidth() implementation by
2052  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2053  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2054  */
2055 struct interval {
2056         uint32_t first;
2057         uint32_t last;
2058 };
2059
2060 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2061 {
2062         int min = 0;
2063         int mid;
2064
2065         if (ucs < table[0].first || ucs > table[max].last)
2066                 return 0;
2067         while (max >= min) {
2068                 mid = (min + max) / 2;
2069                 if (ucs > table[mid].last)
2070                         min = mid + 1;
2071                 else if (ucs < table[mid].first)
2072                         max = mid - 1;
2073                 else
2074                         return 1;
2075         }
2076         return 0;
2077 }
2078
2079 static int is_double_width(uint32_t ucs)
2080 {
2081         static const struct interval double_width[] = {
2082                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2083                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2084                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2085                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2086         };
2087         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2088 }
2089
2090 /* acquires console_sem */
2091 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2092 {
2093 #ifdef VT_BUF_VRAM_ONLY
2094 #define FLUSH do { } while(0);
2095 #else
2096 #define FLUSH if (draw_x >= 0) { \
2097         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2098         draw_x = -1; \
2099         }
2100 #endif
2101
2102         int c, tc, ok, n = 0, draw_x = -1;
2103         unsigned int currcons;
2104         unsigned long draw_from = 0, draw_to = 0;
2105         struct vc_data *vc;
2106         unsigned char vc_attr;
2107         struct vt_notifier_param param;
2108         uint8_t rescan;
2109         uint8_t inverse;
2110         uint8_t width;
2111         u16 himask, charmask;
2112         const unsigned char *orig_buf = NULL;
2113         int orig_count;
2114
2115         if (in_interrupt())
2116                 return count;
2117
2118         might_sleep();
2119
2120         acquire_console_sem();
2121         vc = tty->driver_data;
2122         if (vc == NULL) {
2123                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2124                 release_console_sem();
2125                 return 0;
2126         }
2127
2128         currcons = vc->vc_num;
2129         if (!vc_cons_allocated(currcons)) {
2130             /* could this happen? */
2131             static int error = 0;
2132             if (!error) {
2133                 error = 1;
2134                 printk("con_write: tty %d not allocated\n", currcons+1);
2135             }
2136             release_console_sem();
2137             return 0;
2138         }
2139         release_console_sem();
2140
2141         orig_buf = buf;
2142         orig_count = count;
2143
2144         /* At this point 'buf' is guaranteed to be a kernel buffer
2145          * and therefore no access to userspace (and therefore sleeping)
2146          * will be needed.  The con_buf_mtx serializes all tty based
2147          * console rendering and vcs write/read operations.  We hold
2148          * the console spinlock during the entire write.
2149          */
2150
2151         acquire_console_sem();
2152
2153         vc = tty->driver_data;
2154         if (vc == NULL) {
2155                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2156                 release_console_sem();
2157                 goto out;
2158         }
2159
2160         himask = vc->vc_hi_font_mask;
2161         charmask = himask ? 0x1ff : 0xff;
2162
2163         /* undraw cursor first */
2164         if (IS_FG(vc))
2165                 hide_cursor(vc);
2166
2167         param.vc = vc;
2168
2169         while (!tty->stopped && count) {
2170                 int orig = *buf;
2171                 c = orig;
2172                 buf++;
2173                 n++;
2174                 count--;
2175                 rescan = 0;
2176                 inverse = 0;
2177                 width = 1;
2178
2179                 /* Do no translation at all in control states */
2180                 if (vc->vc_state != ESnormal) {
2181                         tc = c;
2182                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2183                     /* Combine UTF-8 into Unicode in vc_utf_char.
2184                      * vc_utf_count is the number of continuation bytes still
2185                      * expected to arrive.
2186                      * vc_npar is the number of continuation bytes arrived so
2187                      * far
2188                      */
2189 rescan_last_byte:
2190                     if ((c & 0xc0) == 0x80) {
2191                         /* Continuation byte received */
2192                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2193                         if (vc->vc_utf_count) {
2194                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2195                             vc->vc_npar++;
2196                             if (--vc->vc_utf_count) {
2197                                 /* Still need some bytes */
2198                                 continue;
2199                             }
2200                             /* Got a whole character */
2201                             c = vc->vc_utf_char;
2202                             /* Reject overlong sequences */
2203                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2204                                         c > utf8_length_changes[vc->vc_npar])
2205                                 c = 0xfffd;
2206                         } else {
2207                             /* Unexpected continuation byte */
2208                             vc->vc_utf_count = 0;
2209                             c = 0xfffd;
2210                         }
2211                     } else {
2212                         /* Single ASCII byte or first byte of a sequence received */
2213                         if (vc->vc_utf_count) {
2214                             /* Continuation byte expected */
2215                             rescan = 1;
2216                             vc->vc_utf_count = 0;
2217                             c = 0xfffd;
2218                         } else if (c > 0x7f) {
2219                             /* First byte of a multibyte sequence received */
2220                             vc->vc_npar = 0;
2221                             if ((c & 0xe0) == 0xc0) {
2222                                 vc->vc_utf_count = 1;
2223                                 vc->vc_utf_char = (c & 0x1f);
2224                             } else if ((c & 0xf0) == 0xe0) {
2225                                 vc->vc_utf_count = 2;
2226                                 vc->vc_utf_char = (c & 0x0f);
2227                             } else if ((c & 0xf8) == 0xf0) {
2228                                 vc->vc_utf_count = 3;
2229                                 vc->vc_utf_char = (c & 0x07);
2230                             } else if ((c & 0xfc) == 0xf8) {
2231                                 vc->vc_utf_count = 4;
2232                                 vc->vc_utf_char = (c & 0x03);
2233                             } else if ((c & 0xfe) == 0xfc) {
2234                                 vc->vc_utf_count = 5;
2235                                 vc->vc_utf_char = (c & 0x01);
2236                             } else {
2237                                 /* 254 and 255 are invalid */
2238                                 c = 0xfffd;
2239                             }
2240                             if (vc->vc_utf_count) {
2241                                 /* Still need some bytes */
2242                                 continue;
2243                             }
2244                         }
2245                         /* Nothing to do if an ASCII byte was received */
2246                     }
2247                     /* End of UTF-8 decoding. */
2248                     /* c is the received character, or U+FFFD for invalid sequences. */
2249                     /* Replace invalid Unicode code points with U+FFFD too */
2250                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2251                         c = 0xfffd;
2252                     tc = c;
2253                 } else {        /* no utf or alternate charset mode */
2254                     tc = vc_translate(vc, c);
2255                 }
2256
2257                 param.c = tc;
2258                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2259                                         &param) == NOTIFY_STOP)
2260                         continue;
2261
2262                 /* If the original code was a control character we
2263                  * only allow a glyph to be displayed if the code is
2264                  * not normally used (such as for cursor movement) or
2265                  * if the disp_ctrl mode has been explicitly enabled.
2266                  * Certain characters (as given by the CTRL_ALWAYS
2267                  * bitmap) are always displayed as control characters,
2268                  * as the console would be pretty useless without
2269                  * them; to display an arbitrary font position use the
2270                  * direct-to-font zone in UTF-8 mode.
2271                  */
2272                 ok = tc && (c >= 32 ||
2273                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2274                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2275                         && (c != 127 || vc->vc_disp_ctrl)
2276                         && (c != 128+27);
2277
2278                 if (vc->vc_state == ESnormal && ok) {
2279                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2280                                 if (is_double_width(c))
2281                                         width = 2;
2282                         }
2283                         /* Now try to find out how to display it */
2284                         tc = conv_uni_to_pc(vc, tc);
2285                         if (tc & ~charmask) {
2286                                 if (tc == -1 || tc == -2) {
2287                                     continue; /* nothing to display */
2288                                 }
2289                                 /* Glyph not found */
2290                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2291                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2292                                        This would make absolutely no sense with Unicode in mind,
2293                                        but do this for ASCII characters since a font may lack
2294                                        Unicode mapping info and we don't want to end up with
2295                                        having question marks only. */
2296                                     tc = c;
2297                                 } else {
2298                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2299                                     tc = conv_uni_to_pc(vc, 0xfffd);
2300                                     if (tc < 0) {
2301                                         inverse = 1;
2302                                         tc = conv_uni_to_pc(vc, '?');
2303                                         if (tc < 0) tc = '?';
2304                                     }
2305                                 }
2306                         }
2307
2308                         if (!inverse) {
2309                                 vc_attr = vc->vc_attr;
2310                         } else {
2311                                 /* invert vc_attr */
2312                                 if (!vc->vc_can_do_color) {
2313                                         vc_attr = (vc->vc_attr) ^ 0x08;
2314                                 } else if (vc->vc_hi_font_mask == 0x100) {
2315                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2316                                 } else {
2317                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2318                                 }
2319                                 FLUSH
2320                         }
2321
2322                         while (1) {
2323                                 if (vc->vc_need_wrap || vc->vc_decim)
2324                                         FLUSH
2325                                 if (vc->vc_need_wrap) {
2326                                         cr(vc);
2327                                         lf(vc);
2328                                 }
2329                                 if (vc->vc_decim)
2330                                         insert_char(vc, 1);
2331                                 scr_writew(himask ?
2332                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2333                                              (vc_attr << 8) + tc,
2334                                            (u16 *) vc->vc_pos);
2335                                 if (DO_UPDATE(vc) && draw_x < 0) {
2336                                         draw_x = vc->vc_x;
2337                                         draw_from = vc->vc_pos;
2338                                 }
2339                                 if (vc->vc_x == vc->vc_cols - 1) {
2340                                         vc->vc_need_wrap = vc->vc_decawm;
2341                                         draw_to = vc->vc_pos + 2;
2342                                 } else {
2343                                         vc->vc_x++;
2344                                         draw_to = (vc->vc_pos += 2);
2345                                 }
2346
2347                                 if (!--width) break;
2348
2349                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2350                                 if (tc < 0) tc = ' ';
2351                         }
2352                         notify_write(vc, c);
2353
2354                         if (inverse) {
2355                                 FLUSH
2356                         }
2357
2358                         if (rescan) {
2359                                 rescan = 0;
2360                                 inverse = 0;
2361                                 width = 1;
2362                                 c = orig;
2363                                 goto rescan_last_byte;
2364                         }
2365                         continue;
2366                 }
2367                 FLUSH
2368                 do_con_trol(tty, vc, orig);
2369         }
2370         FLUSH
2371         console_conditional_schedule();
2372         release_console_sem();
2373
2374 out:
2375         notify_update(vc);
2376         return n;
2377 #undef FLUSH
2378 }
2379
2380 /*
2381  * This is the console switching callback.
2382  *
2383  * Doing console switching in a process context allows
2384  * us to do the switches asynchronously (needed when we want
2385  * to switch due to a keyboard interrupt).  Synchronization
2386  * with other console code and prevention of re-entrancy is
2387  * ensured with console_sem.
2388  */
2389 static void console_callback(struct work_struct *ignored)
2390 {
2391         acquire_console_sem();
2392
2393         if (want_console >= 0) {
2394                 if (want_console != fg_console &&
2395                     vc_cons_allocated(want_console)) {
2396                         hide_cursor(vc_cons[fg_console].d);
2397                         change_console(vc_cons[want_console].d);
2398                         /* we only changed when the console had already
2399                            been allocated - a new console is not created
2400                            in an interrupt routine */
2401                 }
2402                 want_console = -1;
2403         }
2404         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2405                 do_poke_blanked_console = 0;
2406                 poke_blanked_console();
2407         }
2408         if (scrollback_delta) {
2409                 struct vc_data *vc = vc_cons[fg_console].d;
2410                 clear_selection();
2411                 if (vc->vc_mode == KD_TEXT)
2412                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2413                 scrollback_delta = 0;
2414         }
2415         if (blank_timer_expired) {
2416                 do_blank_screen(0);
2417                 blank_timer_expired = 0;
2418         }
2419         notify_update(vc_cons[fg_console].d);
2420
2421         release_console_sem();
2422 }
2423
2424 int set_console(int nr)
2425 {
2426         struct vc_data *vc = vc_cons[fg_console].d;
2427
2428         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2429                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2430
2431                 /*
2432                  * Console switch will fail in console_callback() or
2433                  * change_console() so there is no point scheduling
2434                  * the callback
2435                  *
2436                  * Existing set_console() users don't check the return
2437                  * value so this shouldn't break anything
2438                  */
2439                 return -EINVAL;
2440         }
2441
2442         want_console = nr;
2443         schedule_console_callback();
2444
2445         return 0;
2446 }
2447
2448 struct tty_driver *console_driver;
2449
2450 #ifdef CONFIG_VT_CONSOLE
2451
2452 /*
2453  *      Console on virtual terminal
2454  *
2455  * The console must be locked when we get here.
2456  */
2457
2458 static void vt_console_print(struct console *co, const char *b, unsigned count)
2459 {
2460         struct vc_data *vc = vc_cons[fg_console].d;
2461         unsigned char c;
2462         static DEFINE_SPINLOCK(printing_lock);
2463         const ushort *start;
2464         ushort cnt = 0;
2465         ushort myx;
2466
2467         /* console busy or not yet initialized */
2468         if (!printable)
2469                 return;
2470         if (!spin_trylock(&printing_lock))
2471                 return;
2472
2473         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2474                 vc = vc_cons[kmsg_redirect - 1].d;
2475
2476         /* read `x' only after setting currcons properly (otherwise
2477            the `x' macro will read the x of the foreground console). */
2478         myx = vc->vc_x;
2479
2480         if (!vc_cons_allocated(fg_console)) {
2481                 /* impossible */
2482                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2483                 goto quit;
2484         }
2485
2486         if (vc->vc_mode != KD_TEXT)
2487                 goto quit;
2488
2489         /* undraw cursor first */
2490         if (IS_FG(vc))
2491                 hide_cursor(vc);
2492
2493         start = (ushort *)vc->vc_pos;
2494
2495         /* Contrived structure to try to emulate original need_wrap behaviour
2496          * Problems caused when we have need_wrap set on '\n' character */
2497         while (count--) {
2498                 c = *b++;
2499                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2500                         if (cnt > 0) {
2501                                 if (CON_IS_VISIBLE(vc))
2502                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2503                                 vc->vc_x += cnt;
2504                                 if (vc->vc_need_wrap)
2505                                         vc->vc_x--;
2506                                 cnt = 0;
2507                         }
2508                         if (c == 8) {           /* backspace */
2509                                 bs(vc);
2510                                 start = (ushort *)vc->vc_pos;
2511                                 myx = vc->vc_x;
2512                                 continue;
2513                         }
2514                         if (c != 13)
2515                                 lf(vc);
2516                         cr(vc);
2517                         start = (ushort *)vc->vc_pos;
2518                         myx = vc->vc_x;
2519                         if (c == 10 || c == 13)
2520                                 continue;
2521                 }
2522                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2523                 notify_write(vc, c);
2524                 cnt++;
2525                 if (myx == vc->vc_cols - 1) {
2526                         vc->vc_need_wrap = 1;
2527                         continue;
2528                 }
2529                 vc->vc_pos += 2;
2530                 myx++;
2531         }
2532         if (cnt > 0) {
2533                 if (CON_IS_VISIBLE(vc))
2534                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2535                 vc->vc_x += cnt;
2536                 if (vc->vc_x == vc->vc_cols) {
2537                         vc->vc_x--;
2538                         vc->vc_need_wrap = 1;
2539                 }
2540         }
2541         set_cursor(vc);
2542         notify_update(vc);
2543
2544 quit:
2545         spin_unlock(&printing_lock);
2546 }
2547
2548 static struct tty_driver *vt_console_device(struct console *c, int *index)
2549 {
2550         *index = c->index ? c->index-1 : fg_console;
2551         return console_driver;
2552 }
2553
2554 static struct console vt_console_driver = {
2555         .name           = "tty",
2556         .write          = vt_console_print,
2557         .device         = vt_console_device,
2558         .unblank        = unblank_screen,
2559         .flags          = CON_PRINTBUFFER,
2560         .index          = -1,
2561 };
2562 #endif
2563
2564 /*
2565  *      Handling of Linux-specific VC ioctls
2566  */
2567
2568 /*
2569  * Generally a bit racy with respect to console_sem().
2570  *
2571  * There are some functions which don't need it.
2572  *
2573  * There are some functions which can sleep for arbitrary periods
2574  * (paste_selection) but we don't need the lock there anyway.
2575  *
2576  * set_selection has locking, and definitely needs it
2577  */
2578
2579 int tioclinux(struct tty_struct *tty, unsigned long arg)
2580 {
2581         char type, data;
2582         char __user *p = (char __user *)arg;
2583         int lines;
2584         int ret;
2585
2586         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2587                 return -EINVAL;
2588         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2589                 return -EPERM;
2590         if (get_user(type, p))
2591                 return -EFAULT;
2592         ret = 0;
2593
2594         lock_kernel();
2595
2596         switch (type)
2597         {
2598                 case TIOCL_SETSEL:
2599                         acquire_console_sem();
2600                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2601                         release_console_sem();
2602                         break;
2603                 case TIOCL_PASTESEL:
2604                         ret = paste_selection(tty);
2605                         break;
2606                 case TIOCL_UNBLANKSCREEN:
2607                         acquire_console_sem();
2608                         unblank_screen();
2609                         release_console_sem();
2610                         break;
2611                 case TIOCL_SELLOADLUT:
2612                         ret = sel_loadlut(p);
2613                         break;
2614                 case TIOCL_GETSHIFTSTATE:
2615
2616         /*
2617          * Make it possible to react to Shift+Mousebutton.
2618          * Note that 'shift_state' is an undocumented
2619          * kernel-internal variable; programs not closely
2620          * related to the kernel should not use this.
2621          */
2622                         data = shift_state;
2623                         ret = __put_user(data, p);
2624                         break;
2625                 case TIOCL_GETMOUSEREPORTING:
2626                         data = mouse_reporting();
2627                         ret = __put_user(data, p);
2628                         break;
2629                 case TIOCL_SETVESABLANK:
2630                         ret = set_vesa_blanking(p);
2631                         break;
2632                 case TIOCL_GETKMSGREDIRECT:
2633                         data = kmsg_redirect;
2634                         ret = __put_user(data, p);
2635                         break;
2636                 case TIOCL_SETKMSGREDIRECT:
2637                         if (!capable(CAP_SYS_ADMIN)) {
2638                                 ret = -EPERM;
2639                         } else {
2640                                 if (get_user(data, p+1))
2641                                         ret = -EFAULT;
2642                                 else
2643                                         kmsg_redirect = data;
2644                         }
2645                         break;
2646                 case TIOCL_GETFGCONSOLE:
2647                         ret = fg_console;
2648                         break;
2649                 case TIOCL_SCROLLCONSOLE:
2650                         if (get_user(lines, (s32 __user *)(p+4))) {
2651                                 ret = -EFAULT;
2652                         } else {
2653                                 scrollfront(vc_cons[fg_console].d, lines);
2654                                 ret = 0;
2655                         }
2656                         break;
2657                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2658                         acquire_console_sem();
2659                         ignore_poke = 1;
2660                         do_blank_screen(0);
2661                         release_console_sem();
2662                         break;
2663                 case TIOCL_BLANKEDSCREEN:
2664                         ret = console_blanked;
2665                         break;
2666                 default:
2667                         ret = -EINVAL;
2668                         break;
2669         }
2670         unlock_kernel();
2671         return ret;
2672 }
2673
2674 /*
2675  * /dev/ttyN handling
2676  */
2677
2678 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2679 {
2680         int     retval;
2681
2682         retval = do_con_write(tty, buf, count);
2683         con_flush_chars(tty);
2684
2685         return retval;
2686 }
2687
2688 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2689 {
2690         if (in_interrupt())
2691                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2692         return do_con_write(tty, &ch, 1);
2693 }
2694
2695 static int con_write_room(struct tty_struct *tty)
2696 {
2697         if (tty->stopped)
2698                 return 0;
2699         return 4096;            /* No limit, really; we're not buffering */
2700 }
2701
2702 static int con_chars_in_buffer(struct tty_struct *tty)
2703 {
2704         return 0;               /* we're not buffering */
2705 }
2706
2707 /*
2708  * con_throttle and con_unthrottle are only used for
2709  * paste_selection(), which has to stuff in a large number of
2710  * characters...
2711  */
2712 static void con_throttle(struct tty_struct *tty)
2713 {
2714 }
2715
2716 static void con_unthrottle(struct tty_struct *tty)
2717 {
2718         struct vc_data *vc = tty->driver_data;
2719
2720         wake_up_interruptible(&vc->paste_wait);
2721 }
2722
2723 /*
2724  * Turn the Scroll-Lock LED on when the tty is stopped
2725  */
2726 static void con_stop(struct tty_struct *tty)
2727 {
2728         int console_num;
2729         if (!tty)
2730                 return;
2731         console_num = tty->index;
2732         if (!vc_cons_allocated(console_num))
2733                 return;
2734         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2735         set_leds();
2736 }
2737
2738 /*
2739  * Turn the Scroll-Lock LED off when the console is started
2740  */
2741 static void con_start(struct tty_struct *tty)
2742 {
2743         int console_num;
2744         if (!tty)
2745                 return;
2746         console_num = tty->index;
2747         if (!vc_cons_allocated(console_num))
2748                 return;
2749         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2750         set_leds();
2751 }
2752
2753 static void con_flush_chars(struct tty_struct *tty)
2754 {
2755         struct vc_data *vc;
2756
2757         if (in_interrupt())     /* from flush_to_ldisc */
2758                 return;
2759
2760         /* if we race with con_close(), vt may be null */
2761         acquire_console_sem();
2762         vc = tty->driver_data;
2763         if (vc)
2764                 set_cursor(vc);
2765         release_console_sem();
2766 }
2767
2768 /*
2769  * Allocate the console screen memory.
2770  */
2771 static int con_open(struct tty_struct *tty, struct file *filp)
2772 {
2773         unsigned int currcons = tty->index;
2774         int ret = 0;
2775
2776         acquire_console_sem();
2777         if (tty->driver_data == NULL) {
2778                 ret = vc_allocate(currcons);
2779                 if (ret == 0) {
2780                         struct vc_data *vc = vc_cons[currcons].d;
2781                         tty->driver_data = vc;
2782                         vc->vc_tty = tty;
2783
2784                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2785                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2786                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2787                         }
2788                         if (vc->vc_utf)
2789                                 tty->termios->c_iflag |= IUTF8;
2790                         else
2791                                 tty->termios->c_iflag &= ~IUTF8;
2792                         vcs_make_sysfs(tty);
2793                         release_console_sem();
2794                         return ret;
2795                 }
2796         }
2797         release_console_sem();
2798         return ret;
2799 }
2800
2801 /*
2802  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2803  * and taking a ref against the tty while we're in the process of forgetting
2804  * about it and cleaning things up.
2805  *
2806  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2807  */
2808 static void con_close(struct tty_struct *tty, struct file *filp)
2809 {
2810         mutex_lock(&tty_mutex);
2811         acquire_console_sem();
2812         if (tty && tty->count == 1) {
2813                 struct vc_data *vc = tty->driver_data;
2814
2815                 if (vc)
2816                         vc->vc_tty = NULL;
2817                 tty->driver_data = NULL;
2818                 vcs_remove_sysfs(tty);
2819                 release_console_sem();
2820                 mutex_unlock(&tty_mutex);
2821                 /*
2822                  * tty_mutex is released, but we still hold BKL, so there is
2823                  * still exclusion against init_dev()
2824                  */
2825                 return;
2826         }
2827         release_console_sem();
2828         mutex_unlock(&tty_mutex);
2829 }
2830
2831 static int default_italic_color    = 2; // green (ASCII)
2832 static int default_underline_color = 3; // cyan (ASCII)
2833 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2834 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2835
2836 static void vc_init(struct vc_data *vc, unsigned int rows,
2837                     unsigned int cols, int do_clear)
2838 {
2839         int j, k ;
2840
2841         vc->vc_cols = cols;
2842         vc->vc_rows = rows;
2843         vc->vc_size_row = cols << 1;
2844         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2845
2846         set_origin(vc);
2847         vc->vc_pos = vc->vc_origin;
2848         reset_vc(vc);
2849         for (j=k=0; j<16; j++) {
2850                 vc->vc_palette[k++] = default_red[j] ;
2851                 vc->vc_palette[k++] = default_grn[j] ;
2852                 vc->vc_palette[k++] = default_blu[j] ;
2853         }
2854         vc->vc_def_color       = 0x07;   /* white */
2855         vc->vc_ulcolor         = default_underline_color;
2856         vc->vc_itcolor         = default_italic_color;
2857         vc->vc_halfcolor       = 0x08;   /* grey */
2858         init_waitqueue_head(&vc->paste_wait);
2859         reset_terminal(vc, do_clear);
2860 }
2861
2862 /*
2863  * This routine initializes console interrupts, and does nothing
2864  * else. If you want the screen to clear, call tty_write with
2865  * the appropriate escape-sequence.
2866  */
2867
2868 static int __init con_init(void)
2869 {
2870         const char *display_desc = NULL;
2871         struct vc_data *vc;
2872         unsigned int currcons = 0, i;
2873
2874         acquire_console_sem();
2875
2876         if (conswitchp)
2877                 display_desc = conswitchp->con_startup();
2878         if (!display_desc) {
2879                 fg_console = 0;
2880                 release_console_sem();
2881                 return 0;
2882         }
2883
2884         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2885                 struct con_driver *con_driver = &registered_con_driver[i];
2886
2887                 if (con_driver->con == NULL) {
2888                         con_driver->con = conswitchp;
2889                         con_driver->desc = display_desc;
2890                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2891                         con_driver->first = 0;
2892                         con_driver->last = MAX_NR_CONSOLES - 1;
2893                         break;
2894                 }
2895         }
2896
2897         for (i = 0; i < MAX_NR_CONSOLES; i++)
2898                 con_driver_map[i] = conswitchp;
2899
2900         if (blankinterval) {
2901                 blank_state = blank_normal_wait;
2902                 mod_timer(&console_timer, jiffies + blankinterval);
2903         }
2904
2905         /*
2906          * kmalloc is not running yet - we use the bootmem allocator.
2907          */
2908         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2909                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2910                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2911                 visual_init(vc, currcons, 1);
2912                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2913                 vc->vc_kmalloced = 0;
2914                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2915                         currcons || !vc->vc_sw->con_save_screen);
2916         }
2917         currcons = fg_console = 0;
2918         master_display_fg = vc = vc_cons[currcons].d;
2919         set_origin(vc);
2920         save_screen(vc);
2921         gotoxy(vc, vc->vc_x, vc->vc_y);
2922         csi_J(vc, 0);
2923         update_screen(vc);
2924         printk("Console: %s %s %dx%d",
2925                 vc->vc_can_do_color ? "colour" : "mono",
2926                 display_desc, vc->vc_cols, vc->vc_rows);
2927         printable = 1;
2928         printk("\n");
2929
2930         release_console_sem();
2931
2932 #ifdef CONFIG_VT_CONSOLE
2933         register_console(&vt_console_driver);
2934 #endif
2935         return 0;
2936 }
2937 console_initcall(con_init);
2938
2939 static const struct tty_operations con_ops = {
2940         .open = con_open,
2941         .close = con_close,
2942         .write = con_write,
2943         .write_room = con_write_room,
2944         .put_char = con_put_char,
2945         .flush_chars = con_flush_chars,
2946         .chars_in_buffer = con_chars_in_buffer,
2947         .ioctl = vt_ioctl,
2948         .stop = con_stop,
2949         .start = con_start,
2950         .throttle = con_throttle,
2951         .unthrottle = con_unthrottle,
2952         .resize = vt_resize,
2953 };
2954
2955 int __init vty_init(void)
2956 {
2957         vcs_init();
2958
2959         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2960         if (!console_driver)
2961                 panic("Couldn't allocate console driver\n");
2962         console_driver->owner = THIS_MODULE;
2963         console_driver->name = "tty";
2964         console_driver->name_base = 1;
2965         console_driver->major = TTY_MAJOR;
2966         console_driver->minor_start = 1;
2967         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2968         console_driver->init_termios = tty_std_termios;
2969         if (default_utf8)
2970                 console_driver->init_termios.c_iflag |= IUTF8;
2971         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2972         tty_set_operations(console_driver, &con_ops);
2973         if (tty_register_driver(console_driver))
2974                 panic("Couldn't register console driver\n");
2975
2976         kbd_init();
2977         console_map_init();
2978 #ifdef CONFIG_PROM_CONSOLE
2979         prom_con_init();
2980 #endif
2981 #ifdef CONFIG_MDA_CONSOLE
2982         mda_console_init();
2983 #endif
2984         return 0;
2985 }
2986
2987 #ifndef VT_SINGLE_DRIVER
2988 #include <linux/device.h>
2989
2990 static struct class *vtconsole_class;
2991
2992 static int bind_con_driver(const struct consw *csw, int first, int last,
2993                            int deflt)
2994 {
2995         struct module *owner = csw->owner;
2996         const char *desc = NULL;
2997         struct con_driver *con_driver;
2998         int i, j = -1, k = -1, retval = -ENODEV;
2999
3000         if (!try_module_get(owner))
3001                 return -ENODEV;
3002
3003         acquire_console_sem();
3004
3005         /* check if driver is registered */
3006         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3007                 con_driver = &registered_con_driver[i];
3008
3009                 if (con_driver->con == csw) {
3010                         desc = con_driver->desc;
3011                         retval = 0;
3012                         break;
3013                 }
3014         }
3015
3016         if (retval)
3017                 goto err;
3018
3019         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3020                 csw->con_startup();
3021                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3022         }
3023
3024         if (deflt) {
3025                 if (conswitchp)
3026                         module_put(conswitchp->owner);
3027
3028                 __module_get(owner);
3029                 conswitchp = csw;
3030         }
3031
3032         first = max(first, con_driver->first);
3033         last = min(last, con_driver->last);
3034
3035         for (i = first; i <= last; i++) {
3036                 int old_was_color;
3037                 struct vc_data *vc = vc_cons[i].d;
3038
3039                 if (con_driver_map[i])
3040                         module_put(con_driver_map[i]->owner);
3041                 __module_get(owner);
3042                 con_driver_map[i] = csw;
3043
3044                 if (!vc || !vc->vc_sw)
3045                         continue;
3046
3047                 j = i;
3048
3049                 if (CON_IS_VISIBLE(vc)) {
3050                         k = i;
3051                         save_screen(vc);
3052                 }
3053
3054                 old_was_color = vc->vc_can_do_color;
3055                 vc->vc_sw->con_deinit(vc);
3056                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3057                 visual_init(vc, i, 0);
3058                 set_origin(vc);
3059                 update_attr(vc);
3060
3061                 /* If the console changed between mono <-> color, then
3062                  * the attributes in the screenbuf will be wrong.  The
3063                  * following resets all attributes to something sane.
3064                  */
3065                 if (old_was_color != vc->vc_can_do_color)
3066                         clear_buffer_attributes(vc);
3067         }
3068
3069         printk("Console: switching ");
3070         if (!deflt)
3071                 printk("consoles %d-%d ", first+1, last+1);
3072         if (j >= 0) {
3073                 struct vc_data *vc = vc_cons[j].d;
3074
3075                 printk("to %s %s %dx%d\n",
3076                        vc->vc_can_do_color ? "colour" : "mono",
3077                        desc, vc->vc_cols, vc->vc_rows);
3078
3079                 if (k >= 0) {
3080                         vc = vc_cons[k].d;
3081                         update_screen(vc);
3082                 }
3083         } else
3084                 printk("to %s\n", desc);
3085
3086         retval = 0;
3087 err:
3088         release_console_sem();
3089         module_put(owner);
3090         return retval;
3091 };
3092
3093 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3094 static int con_is_graphics(const struct consw *csw, int first, int last)
3095 {
3096         int i, retval = 0;
3097
3098         for (i = first; i <= last; i++) {
3099                 struct vc_data *vc = vc_cons[i].d;
3100
3101                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3102                         retval = 1;
3103                         break;
3104                 }
3105         }
3106
3107         return retval;
3108 }
3109
3110 /**
3111  * unbind_con_driver - unbind a console driver
3112  * @csw: pointer to console driver to unregister
3113  * @first: first in range of consoles that @csw should be unbound from
3114  * @last: last in range of consoles that @csw should be unbound from
3115  * @deflt: should next bound console driver be default after @csw is unbound?
3116  *
3117  * To unbind a driver from all possible consoles, pass 0 as @first and
3118  * %MAX_NR_CONSOLES as @last.
3119  *
3120  * @deflt controls whether the console that ends up replacing @csw should be
3121  * the default console.
3122  *
3123  * RETURNS:
3124  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3125  * or 0 on success.
3126  */
3127 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3128 {
3129         struct module *owner = csw->owner;
3130         const struct consw *defcsw = NULL;
3131         struct con_driver *con_driver = NULL, *con_back = NULL;
3132         int i, retval = -ENODEV;
3133
3134         if (!try_module_get(owner))
3135                 return -ENODEV;
3136
3137         acquire_console_sem();
3138
3139         /* check if driver is registered and if it is unbindable */
3140         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3141                 con_driver = &registered_con_driver[i];
3142
3143                 if (con_driver->con == csw &&
3144                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3145                         retval = 0;
3146                         break;
3147                 }
3148         }
3149
3150         if (retval) {
3151                 release_console_sem();
3152                 goto err;
3153         }
3154
3155         retval = -ENODEV;
3156
3157         /* check if backup driver exists */
3158         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3159                 con_back = &registered_con_driver[i];
3160
3161                 if (con_back->con &&
3162                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3163                         defcsw = con_back->con;
3164                         retval = 0;
3165                         break;
3166                 }
3167         }
3168
3169         if (retval) {
3170                 release_console_sem();
3171                 goto err;
3172         }
3173
3174         if (!con_is_bound(csw)) {
3175                 release_console_sem();
3176                 goto err;
3177         }
3178
3179         first = max(first, con_driver->first);
3180         last = min(last, con_driver->last);
3181
3182         for (i = first; i <= last; i++) {
3183                 if (con_driver_map[i] == csw) {
3184                         module_put(csw->owner);
3185                         con_driver_map[i] = NULL;
3186                 }
3187         }
3188
3189         if (!con_is_bound(defcsw)) {
3190                 const struct consw *defconsw = conswitchp;
3191
3192                 defcsw->con_startup();
3193                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3194                 /*
3195                  * vgacon may change the default driver to point
3196                  * to dummycon, we restore it here...
3197                  */
3198                 conswitchp = defconsw;
3199         }
3200
3201         if (!con_is_bound(csw))
3202                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3203
3204         release_console_sem();
3205         /* ignore return value, binding should not fail */
3206         bind_con_driver(defcsw, first, last, deflt);
3207 err:
3208         module_put(owner);
3209         return retval;
3210
3211 }
3212 EXPORT_SYMBOL(unbind_con_driver);
3213
3214 static int vt_bind(struct con_driver *con)
3215 {
3216         const struct consw *defcsw = NULL, *csw = NULL;
3217         int i, more = 1, first = -1, last = -1, deflt = 0;
3218
3219         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3220             con_is_graphics(con->con, con->first, con->last))
3221                 goto err;
3222
3223         csw = con->con;
3224
3225         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3226                 struct con_driver *con = &registered_con_driver[i];
3227
3228                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3229                         defcsw = con->con;
3230                         break;
3231                 }
3232         }
3233
3234         if (!defcsw)
3235                 goto err;
3236
3237         while (more) {
3238                 more = 0;
3239
3240                 for (i = con->first; i <= con->last; i++) {
3241                         if (con_driver_map[i] == defcsw) {
3242                                 if (first == -1)
3243                                         first = i;
3244                                 last = i;
3245                                 more = 1;
3246                         } else if (first != -1)
3247                                 break;
3248                 }
3249
3250                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3251                         deflt = 1;
3252
3253                 if (first != -1)
3254                         bind_con_driver(csw, first, last, deflt);
3255
3256                 first = -1;
3257                 last = -1;
3258                 deflt = 0;
3259         }
3260
3261 err:
3262         return 0;
3263 }
3264
3265 static int vt_unbind(struct con_driver *con)
3266 {
3267         const struct consw *csw = NULL;
3268         int i, more = 1, first = -1, last = -1, deflt = 0;
3269
3270         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3271             con_is_graphics(con->con, con->first, con->last))
3272                 goto err;
3273
3274         csw = con->con;
3275
3276         while (more) {
3277                 more = 0;
3278
3279                 for (i = con->first; i <= con->last; i++) {
3280                         if (con_driver_map[i] == csw) {
3281                                 if (first == -1)
3282                                         first = i;
3283                                 last = i;
3284                                 more = 1;
3285                         } else if (first != -1)
3286                                 break;
3287                 }
3288
3289                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3290                         deflt = 1;
3291
3292                 if (first != -1)
3293                         unbind_con_driver(csw, first, last, deflt);
3294
3295                 first = -1;
3296                 last = -1;
3297                 deflt = 0;
3298         }
3299
3300 err:
3301         return 0;
3302 }
3303 #else
3304 static inline int vt_bind(struct con_driver *con)
3305 {
3306         return 0;
3307 }
3308 static inline int vt_unbind(struct con_driver *con)
3309 {
3310         return 0;
3311 }
3312 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3313
3314 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3315                           const char *buf, size_t count)
3316 {
3317         struct con_driver *con = dev_get_drvdata(dev);
3318         int bind = simple_strtoul(buf, NULL, 0);
3319
3320         if (bind)
3321                 vt_bind(con);
3322         else
3323                 vt_unbind(con);
3324
3325         return count;
3326 }
3327
3328 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3329                          char *buf)
3330 {
3331         struct con_driver *con = dev_get_drvdata(dev);
3332         int bind = con_is_bound(con->con);
3333
3334         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3335 }
3336
3337 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3338                          char *buf)
3339 {
3340         struct con_driver *con = dev_get_drvdata(dev);
3341
3342         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3343                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3344                          con->desc);
3345
3346 }
3347
3348 static struct device_attribute device_attrs[] = {
3349         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3350         __ATTR(name, S_IRUGO, show_name, NULL),
3351 };
3352
3353 static int vtconsole_init_device(struct con_driver *con)
3354 {
3355         int i;
3356         int error = 0;
3357
3358         con->flag |= CON_DRIVER_FLAG_ATTR;
3359         dev_set_drvdata(con->dev, con);
3360         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3361                 error = device_create_file(con->dev, &device_attrs[i]);
3362                 if (error)
3363                         break;
3364         }
3365
3366         if (error) {
3367                 while (--i >= 0)
3368                         device_remove_file(con->dev, &device_attrs[i]);
3369                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3370         }
3371
3372         return error;
3373 }
3374
3375 static void vtconsole_deinit_device(struct con_driver *con)
3376 {
3377         int i;
3378
3379         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3380                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3381                         device_remove_file(con->dev, &device_attrs[i]);
3382                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3383         }
3384 }
3385
3386 /**
3387  * con_is_bound - checks if driver is bound to the console
3388  * @csw: console driver
3389  *
3390  * RETURNS: zero if unbound, nonzero if bound
3391  *
3392  * Drivers can call this and if zero, they should release
3393  * all resources allocated on con_startup()
3394  */
3395 int con_is_bound(const struct consw *csw)
3396 {
3397         int i, bound = 0;
3398
3399         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3400                 if (con_driver_map[i] == csw) {
3401                         bound = 1;
3402                         break;
3403                 }
3404         }
3405
3406         return bound;
3407 }
3408 EXPORT_SYMBOL(con_is_bound);
3409
3410 /**
3411  * register_con_driver - register console driver to console layer
3412  * @csw: console driver
3413  * @first: the first console to take over, minimum value is 0
3414  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3415  *
3416  * DESCRIPTION: This function registers a console driver which can later
3417  * bind to a range of consoles specified by @first and @last. It will
3418  * also initialize the console driver by calling con_startup().
3419  */
3420 int register_con_driver(const struct consw *csw, int first, int last)
3421 {
3422         struct module *owner = csw->owner;
3423         struct con_driver *con_driver;
3424         const char *desc;
3425         int i, retval = 0;
3426
3427         if (!try_module_get(owner))
3428                 return -ENODEV;
3429
3430         acquire_console_sem();
3431
3432         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3433                 con_driver = &registered_con_driver[i];
3434
3435                 /* already registered */
3436                 if (con_driver->con == csw)
3437                         retval = -EINVAL;
3438         }
3439
3440         if (retval)
3441                 goto err;
3442
3443         desc = csw->con_startup();
3444
3445         if (!desc)
3446                 goto err;
3447
3448         retval = -EINVAL;
3449
3450         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3451                 con_driver = &registered_con_driver[i];
3452
3453                 if (con_driver->con == NULL) {
3454                         con_driver->con = csw;
3455                         con_driver->desc = desc;
3456                         con_driver->node = i;
3457                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3458                                            CON_DRIVER_FLAG_INIT;
3459                         con_driver->first = first;
3460                         con_driver->last = last;
3461                         retval = 0;
3462                         break;
3463                 }
3464         }
3465
3466         if (retval)
3467                 goto err;
3468
3469         con_driver->dev = device_create_drvdata(vtconsole_class, NULL,
3470                                                 MKDEV(0, con_driver->node),
3471                                                 NULL, "vtcon%i",
3472                                                 con_driver->node);
3473
3474         if (IS_ERR(con_driver->dev)) {
3475                 printk(KERN_WARNING "Unable to create device for %s; "
3476                        "errno = %ld\n", con_driver->desc,
3477                        PTR_ERR(con_driver->dev));
3478                 con_driver->dev = NULL;
3479         } else {
3480                 vtconsole_init_device(con_driver);
3481         }
3482
3483 err:
3484         release_console_sem();
3485         module_put(owner);
3486         return retval;
3487 }
3488 EXPORT_SYMBOL(register_con_driver);
3489
3490 /**
3491  * unregister_con_driver - unregister console driver from console layer
3492  * @csw: console driver
3493  *
3494  * DESCRIPTION: All drivers that registers to the console layer must
3495  * call this function upon exit, or if the console driver is in a state
3496  * where it won't be able to handle console services, such as the
3497  * framebuffer console without loaded framebuffer drivers.
3498  *
3499  * The driver must unbind first prior to unregistration.
3500  */
3501 int unregister_con_driver(const struct consw *csw)
3502 {
3503         int i, retval = -ENODEV;
3504
3505         acquire_console_sem();
3506
3507         /* cannot unregister a bound driver */
3508         if (con_is_bound(csw))
3509                 goto err;
3510
3511         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3512                 struct con_driver *con_driver = &registered_con_driver[i];
3513
3514                 if (con_driver->con == csw &&
3515                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3516                         vtconsole_deinit_device(con_driver);
3517                         device_destroy(vtconsole_class,
3518                                        MKDEV(0, con_driver->node));
3519                         con_driver->con = NULL;
3520                         con_driver->desc = NULL;
3521                         con_driver->dev = NULL;
3522                         con_driver->node = 0;
3523                         con_driver->flag = 0;
3524                         con_driver->first = 0;
3525                         con_driver->last = 0;
3526                         retval = 0;
3527                         break;
3528                 }
3529         }
3530 err:
3531         release_console_sem();
3532         return retval;
3533 }
3534 EXPORT_SYMBOL(unregister_con_driver);
3535
3536 /*
3537  *      If we support more console drivers, this function is used
3538  *      when a driver wants to take over some existing consoles
3539  *      and become default driver for newly opened ones.
3540  *
3541  *      take_over_console is basically a register followed by unbind
3542  */
3543 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3544 {
3545         int err;
3546
3547         err = register_con_driver(csw, first, last);
3548
3549         if (!err)
3550                 bind_con_driver(csw, first, last, deflt);
3551
3552         return err;
3553 }
3554
3555 /*
3556  * give_up_console is a wrapper to unregister_con_driver. It will only
3557  * work if driver is fully unbound.
3558  */
3559 void give_up_console(const struct consw *csw)
3560 {
3561         unregister_con_driver(csw);
3562 }
3563
3564 static int __init vtconsole_class_init(void)
3565 {
3566         int i;
3567
3568         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3569         if (IS_ERR(vtconsole_class)) {
3570                 printk(KERN_WARNING "Unable to create vt console class; "
3571                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3572                 vtconsole_class = NULL;
3573         }
3574
3575         /* Add system drivers to sysfs */
3576         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3577                 struct con_driver *con = &registered_con_driver[i];
3578
3579                 if (con->con && !con->dev) {
3580                         con->dev = device_create_drvdata(vtconsole_class, NULL,
3581                                                          MKDEV(0, con->node),
3582                                                          NULL, "vtcon%i",
3583                                                          con->node);
3584
3585                         if (IS_ERR(con->dev)) {
3586                                 printk(KERN_WARNING "Unable to create "
3587                                        "device for %s; errno = %ld\n",
3588                                        con->desc, PTR_ERR(con->dev));
3589                                 con->dev = NULL;
3590                         } else {
3591                                 vtconsole_init_device(con);
3592                         }
3593                 }
3594         }
3595
3596         return 0;
3597 }
3598 postcore_initcall(vtconsole_class_init);
3599
3600 #endif
3601
3602 /*
3603  *      Screen blanking
3604  */
3605
3606 static int set_vesa_blanking(char __user *p)
3607 {
3608         unsigned int mode;
3609
3610         if (get_user(mode, p + 1))
3611                 return -EFAULT;
3612
3613         vesa_blank_mode = (mode < 4) ? mode : 0;
3614         return 0;
3615 }
3616
3617 void do_blank_screen(int entering_gfx)
3618 {
3619         struct vc_data *vc = vc_cons[fg_console].d;
3620         int i;
3621
3622         WARN_CONSOLE_UNLOCKED();
3623
3624         if (console_blanked) {
3625                 if (blank_state == blank_vesa_wait) {
3626                         blank_state = blank_off;
3627                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3628                 }
3629                 return;
3630         }
3631
3632         /* entering graphics mode? */
3633         if (entering_gfx) {
3634                 hide_cursor(vc);
3635                 save_screen(vc);
3636                 vc->vc_sw->con_blank(vc, -1, 1);
3637                 console_blanked = fg_console + 1;
3638                 blank_state = blank_off;
3639                 set_origin(vc);
3640                 return;
3641         }
3642
3643         if (blank_state != blank_normal_wait)
3644                 return;
3645         blank_state = blank_off;
3646
3647         /* don't blank graphics */
3648         if (vc->vc_mode != KD_TEXT) {
3649                 console_blanked = fg_console + 1;
3650                 return;
3651         }
3652
3653         hide_cursor(vc);
3654         del_timer_sync(&console_timer);
3655         blank_timer_expired = 0;
3656
3657         save_screen(vc);
3658         /* In case we need to reset origin, blanking hook returns 1 */
3659         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3660         console_blanked = fg_console + 1;
3661         if (i)
3662                 set_origin(vc);
3663
3664         if (console_blank_hook && console_blank_hook(1))
3665                 return;
3666
3667         if (vesa_off_interval && vesa_blank_mode) {
3668                 blank_state = blank_vesa_wait;
3669                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3670         }
3671 }
3672 EXPORT_SYMBOL(do_blank_screen);
3673
3674 /*
3675  * Called by timer as well as from vt_console_driver
3676  */
3677 void do_unblank_screen(int leaving_gfx)
3678 {
3679         struct vc_data *vc;
3680
3681         /* This should now always be called from a "sane" (read: can schedule)
3682          * context for the sake of the low level drivers, except in the special
3683          * case of oops_in_progress
3684          */
3685         if (!oops_in_progress)
3686                 might_sleep();
3687
3688         WARN_CONSOLE_UNLOCKED();
3689
3690         ignore_poke = 0;
3691         if (!console_blanked)
3692                 return;
3693         if (!vc_cons_allocated(fg_console)) {
3694                 /* impossible */
3695                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3696                 return;
3697         }
3698         vc = vc_cons[fg_console].d;
3699         if (vc->vc_mode != KD_TEXT)
3700                 return; /* but leave console_blanked != 0 */
3701
3702         if (blankinterval) {
3703                 mod_timer(&console_timer, jiffies + blankinterval);
3704                 blank_state = blank_normal_wait;
3705         }
3706
3707         console_blanked = 0;
3708         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3709                 /* Low-level driver cannot restore -> do it ourselves */
3710                 update_screen(vc);
3711         if (console_blank_hook)
3712                 console_blank_hook(0);
3713         set_palette(vc);
3714         set_cursor(vc);
3715 }
3716 EXPORT_SYMBOL(do_unblank_screen);
3717
3718 /*
3719  * This is called by the outside world to cause a forced unblank, mostly for
3720  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3721  * call it with 1 as an argument and so force a mode restore... that may kill
3722  * X or at least garbage the screen but would also make the Oops visible...
3723  */
3724 void unblank_screen(void)
3725 {
3726         do_unblank_screen(0);
3727 }
3728
3729 /*
3730  * We defer the timer blanking to work queue so it can take the console mutex
3731  * (console operations can still happen at irq time, but only from printk which
3732  * has the console mutex. Not perfect yet, but better than no locking
3733  */
3734 static void blank_screen_t(unsigned long dummy)
3735 {
3736         if (unlikely(!keventd_up())) {
3737                 mod_timer(&console_timer, jiffies + blankinterval);
3738                 return;
3739         }
3740         blank_timer_expired = 1;
3741         schedule_work(&console_work);
3742 }
3743
3744 void poke_blanked_console(void)
3745 {
3746         WARN_CONSOLE_UNLOCKED();
3747
3748         /* Add this so we quickly catch whoever might call us in a non
3749          * safe context. Nowadays, unblank_screen() isn't to be called in
3750          * atomic contexts and is allowed to schedule (with the special case
3751          * of oops_in_progress, but that isn't of any concern for this
3752          * function. --BenH.
3753          */
3754         might_sleep();
3755
3756         /* This isn't perfectly race free, but a race here would be mostly harmless,
3757          * at worse, we'll do a spurrious blank and it's unlikely
3758          */
3759         del_timer(&console_timer);
3760         blank_timer_expired = 0;
3761
3762         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3763                 return;
3764         if (console_blanked)
3765                 unblank_screen();
3766         else if (blankinterval) {
3767                 mod_timer(&console_timer, jiffies + blankinterval);
3768                 blank_state = blank_normal_wait;
3769         }
3770 }
3771
3772 /*
3773  *      Palettes
3774  */
3775
3776 static void set_palette(struct vc_data *vc)
3777 {
3778         WARN_CONSOLE_UNLOCKED();
3779
3780         if (vc->vc_mode != KD_GRAPHICS)
3781                 vc->vc_sw->con_set_palette(vc, color_table);
3782 }
3783
3784 static int set_get_cmap(unsigned char __user *arg, int set)
3785 {
3786     int i, j, k;
3787
3788     WARN_CONSOLE_UNLOCKED();
3789
3790     for (i = 0; i < 16; i++)
3791         if (set) {
3792             get_user(default_red[i], arg++);
3793             get_user(default_grn[i], arg++);
3794             get_user(default_blu[i], arg++);
3795         } else {
3796             put_user(default_red[i], arg++);
3797             put_user(default_grn[i], arg++);
3798             put_user(default_blu[i], arg++);
3799         }
3800     if (set) {
3801         for (i = 0; i < MAX_NR_CONSOLES; i++)
3802             if (vc_cons_allocated(i)) {
3803                 for (j = k = 0; j < 16; j++) {
3804                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3805                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3806                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3807                 }
3808                 set_palette(vc_cons[i].d);
3809             }
3810     }
3811     return 0;
3812 }
3813
3814 /*
3815  * Load palette into the DAC registers. arg points to a colour
3816  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3817  */
3818
3819 int con_set_cmap(unsigned char __user *arg)
3820 {
3821         int rc;
3822
3823         acquire_console_sem();
3824         rc = set_get_cmap (arg,1);
3825         release_console_sem();
3826
3827         return rc;
3828 }
3829
3830 int con_get_cmap(unsigned char __user *arg)
3831 {
3832         int rc;
3833
3834         acquire_console_sem();
3835         rc = set_get_cmap (arg,0);
3836         release_console_sem();
3837
3838         return rc;
3839 }
3840
3841 void reset_palette(struct vc_data *vc)
3842 {
3843         int j, k;
3844         for (j=k=0; j<16; j++) {
3845                 vc->vc_palette[k++] = default_red[j];
3846                 vc->vc_palette[k++] = default_grn[j];
3847                 vc->vc_palette[k++] = default_blu[j];
3848         }
3849         set_palette(vc);
3850 }
3851
3852 /*
3853  *  Font switching
3854  *
3855  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3856  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3857  *  depending on width) reserved for each character which is kinda wasty, but
3858  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3859  *  is upto the actual low-level console-driver convert data into its favorite
3860  *  format (maybe we should add a `fontoffset' field to the `display'
3861  *  structure so we won't have to convert the fontdata all the time.
3862  *  /Jes
3863  */
3864
3865 #define max_font_size 65536
3866
3867 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3868 {
3869         struct console_font font;
3870         int rc = -EINVAL;
3871         int c;
3872
3873         if (vc->vc_mode != KD_TEXT)
3874                 return -EINVAL;
3875
3876         if (op->data) {
3877                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3878                 if (!font.data)
3879                         return -ENOMEM;
3880         } else
3881                 font.data = NULL;
3882
3883         acquire_console_sem();
3884         if (vc->vc_sw->con_font_get)
3885                 rc = vc->vc_sw->con_font_get(vc, &font);
3886         else
3887                 rc = -ENOSYS;
3888         release_console_sem();
3889
3890         if (rc)
3891                 goto out;
3892
3893         c = (font.width+7)/8 * 32 * font.charcount;
3894
3895         if (op->data && font.charcount > op->charcount)
3896                 rc = -ENOSPC;
3897         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3898                 if (font.width > op->width || font.height > op->height)
3899                         rc = -ENOSPC;
3900         } else {
3901                 if (font.width != 8)
3902                         rc = -EIO;
3903                 else if ((op->height && font.height > op->height) ||
3904                          font.height > 32)
3905                         rc = -ENOSPC;
3906         }
3907         if (rc)
3908                 goto out;
3909
3910         op->height = font.height;
3911         op->width = font.width;
3912         op->charcount = font.charcount;
3913
3914         if (op->data && copy_to_user(op->data, font.data, c))
3915                 rc = -EFAULT;
3916
3917 out:
3918         kfree(font.data);
3919         return rc;
3920 }
3921
3922 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3923 {
3924         struct console_font font;
3925         int rc = -EINVAL;
3926         int size;
3927
3928         if (vc->vc_mode != KD_TEXT)
3929                 return -EINVAL;
3930         if (!op->data)
3931                 return -EINVAL;
3932         if (op->charcount > 512)
3933                 return -EINVAL;
3934         if (!op->height) {              /* Need to guess font height [compat] */
3935                 int h, i;
3936                 u8 __user *charmap = op->data;
3937                 u8 tmp;
3938
3939                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3940                    so that we can get rid of this soon */
3941                 if (!(op->flags & KD_FONT_FLAG_OLD))
3942                         return -EINVAL;
3943                 for (h = 32; h > 0; h--)
3944                         for (i = 0; i < op->charcount; i++) {
3945                                 if (get_user(tmp, &charmap[32*i+h-1]))
3946                                         return -EFAULT;
3947                                 if (tmp)
3948                                         goto nonzero;
3949                         }
3950                 return -EINVAL;
3951         nonzero:
3952                 op->height = h;
3953         }
3954         if (op->width <= 0 || op->width > 32 || op->height > 32)
3955                 return -EINVAL;
3956         size = (op->width+7)/8 * 32 * op->charcount;
3957         if (size > max_font_size)
3958                 return -ENOSPC;
3959         font.charcount = op->charcount;
3960         font.height = op->height;
3961         font.width = op->width;
3962         font.data = kmalloc(size, GFP_KERNEL);
3963         if (!font.data)
3964                 return -ENOMEM;
3965         if (copy_from_user(font.data, op->data, size)) {
3966                 kfree(font.data);
3967                 return -EFAULT;
3968         }
3969         acquire_console_sem();
3970         if (vc->vc_sw->con_font_set)
3971                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3972         else
3973                 rc = -ENOSYS;
3974         release_console_sem();
3975         kfree(font.data);
3976         return rc;
3977 }
3978
3979 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3980 {
3981         struct console_font font = {.width = op->width, .height = op->height};
3982         char name[MAX_FONT_NAME];
3983         char *s = name;
3984         int rc;
3985
3986         if (vc->vc_mode != KD_TEXT)
3987                 return -EINVAL;
3988
3989         if (!op->data)
3990                 s = NULL;
3991         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3992                 return -EFAULT;
3993         else
3994                 name[MAX_FONT_NAME - 1] = 0;
3995
3996         acquire_console_sem();
3997         if (vc->vc_sw->con_font_default)
3998                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3999         else
4000                 rc = -ENOSYS;
4001         release_console_sem();
4002         if (!rc) {
4003                 op->width = font.width;
4004                 op->height = font.height;
4005         }
4006         return rc;
4007 }
4008
4009 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4010 {
4011         int con = op->height;
4012         int rc;
4013
4014         if (vc->vc_mode != KD_TEXT)
4015                 return -EINVAL;
4016
4017         acquire_console_sem();
4018         if (!vc->vc_sw->con_font_copy)
4019                 rc = -ENOSYS;
4020         else if (con < 0 || !vc_cons_allocated(con))
4021                 rc = -ENOTTY;
4022         else if (con == vc->vc_num)     /* nothing to do */
4023                 rc = 0;
4024         else
4025                 rc = vc->vc_sw->con_font_copy(vc, con);
4026         release_console_sem();
4027         return rc;
4028 }
4029
4030 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4031 {
4032         switch (op->op) {
4033         case KD_FONT_OP_SET:
4034                 return con_font_set(vc, op);
4035         case KD_FONT_OP_GET:
4036                 return con_font_get(vc, op);
4037         case KD_FONT_OP_SET_DEFAULT:
4038                 return con_font_default(vc, op);
4039         case KD_FONT_OP_COPY:
4040                 return con_font_copy(vc, op);
4041         }
4042         return -ENOSYS;
4043 }
4044
4045 /*
4046  *      Interface exported to selection and vcs.
4047  */
4048
4049 /* used by selection */
4050 u16 screen_glyph(struct vc_data *vc, int offset)
4051 {
4052         u16 w = scr_readw(screenpos(vc, offset, 1));
4053         u16 c = w & 0xff;
4054
4055         if (w & vc->vc_hi_font_mask)
4056                 c |= 0x100;
4057         return c;
4058 }
4059 EXPORT_SYMBOL_GPL(screen_glyph);
4060
4061 /* used by vcs - note the word offset */
4062 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4063 {
4064         return screenpos(vc, 2 * w_offset, viewed);
4065 }
4066
4067 void getconsxy(struct vc_data *vc, unsigned char *p)
4068 {
4069         p[0] = vc->vc_x;
4070         p[1] = vc->vc_y;
4071 }
4072
4073 void putconsxy(struct vc_data *vc, unsigned char *p)
4074 {
4075         hide_cursor(vc);
4076         gotoxy(vc, p[0], p[1]);
4077         set_cursor(vc);
4078 }
4079
4080 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4081 {
4082         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4083                 return softcursor_original;
4084         return scr_readw(org);
4085 }
4086
4087 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4088 {
4089         scr_writew(val, org);
4090         if ((unsigned long)org == vc->vc_pos) {
4091                 softcursor_original = -1;
4092                 add_softcursor(vc);
4093         }
4094 }
4095
4096 /*
4097  *      Visible symbols for modules
4098  */
4099
4100 EXPORT_SYMBOL(color_table);
4101 EXPORT_SYMBOL(default_red);
4102 EXPORT_SYMBOL(default_grn);
4103 EXPORT_SYMBOL(default_blu);
4104 EXPORT_SYMBOL(update_region);
4105 EXPORT_SYMBOL(redraw_screen);
4106 EXPORT_SYMBOL(vc_resize);
4107 EXPORT_SYMBOL(fg_console);
4108 EXPORT_SYMBOL(console_blank_hook);
4109 EXPORT_SYMBOL(console_blanked);
4110 EXPORT_SYMBOL(vc_cons);
4111 #ifndef VT_SINGLE_DRIVER
4112 EXPORT_SYMBOL(take_over_console);
4113 EXPORT_SYMBOL(give_up_console);
4114 #endif