Pileus Git - ~andy/linux/blob - drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/smp_lock.h>
  93 #include <linux/tiocl.h>
  94 #include <linux/kbd_kern.h>
  95 #include <linux/consolemap.h>
  96 #include <linux/timer.h>
  97 #include <linux/interrupt.h>
  98 #include <linux/workqueue.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103 #include <linux/device.h>
 104 #include <linux/io.h>
 105 #include <asm/system.h>
 106 #include <linux/uaccess.h>
 107
 108 #define MAX_NR_CON_DRIVER 16
 109
 110 #define CON_DRIVER_FLAG_MODULE 1
 111 #define CON_DRIVER_FLAG_INIT   2
 112 #define CON_DRIVER_FLAG_ATTR   4
 113
 114 struct con_driver {
 115         const struct consw *con;
 116         const char *desc;
 117         struct device *dev;
 118         int node;
 119         int first;
 120         int last;
 121         int flag;
 122 };
 123
 124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 125 const struct consw *conswitchp;
 126
 127 /* A bitmap for codes <32. A bit of 1 indicates that the code
 128  * corresponding to that bit number invokes some special action
 129  * (such as cursor movement) and should not be displayed as a
 130  * glyph unless the disp_ctrl mode is explicitly enabled.
 131  */
 132 #define CTRL_ACTION 0x0d00ff81
 133 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 134
 135 /*
 136  * Here is the default bell parameters: 750HZ, 1/8th of a second
 137  */
 138 #define DEFAULT_BELL_PITCH      750
 139 #define DEFAULT_BELL_DURATION   (HZ/8)
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void blank_screen_t(unsigned long dummy);
 159 static void set_palette(struct vc_data *vc);
 160
 161 static int printable;           /* Is console ready for printing? */
 162 int default_utf8 = true;
 163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 164 int global_cursor_default = -1;
 165 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 166
 167 static int cur_default = CUR_DEFAULT;
 168 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 169
 170 /*
 171  * ignore_poke: don't unblank the screen when things are typed.  This is
 172  * mainly for the privacy of braille terminal users.
 173  */
 174 static int ignore_poke;
 175
 176 int do_poke_blanked_console;
 177 int console_blanked;
 178
 179 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 180 static int vesa_off_interval;
 181 static int blankinterval = 10*60;
 182 core_param(consoleblank, blankinterval, int, 0444);
 183
 184 static DECLARE_WORK(console_work, console_callback);
 185
 186 /*
 187  * fg_console is the current virtual console,
 188  * last_console is the last used one,
 189  * want_console is the console we want to switch to,
 190  * saved_* variants are for save/restore around kernel debugger enter/leave
 191  */
 192 int fg_console;
 193 int last_console;
 194 int want_console = -1;
 195 int saved_fg_console;
 196 int saved_last_console;
 197 int saved_want_console;
 198 int saved_vc_mode;
 199
 200 /*
 201  * For each existing display, we have a pointer to console currently visible
 202  * on that display, allowing consoles other than fg_console to be refreshed
 203  * appropriately. Unless the low-level driver supplies its own display_fg
 204  * variable, we use this one for the "master display".
 205  */
 206 static struct vc_data *master_display_fg;
 207
 208 /*
 209  * Unfortunately, we need to delay tty echo when we're currently writing to the
 210  * console since the code is (and always was) not re-entrant, so we schedule
 211  * all flip requests to process context with schedule-task() and run it from
 212  * console_callback().
 213  */
 214
 215 /*
 216  * For the same reason, we defer scrollback to the console callback.
 217  */
 218 static int scrollback_delta;
 219
 220 /*
 221  * Hook so that the power management routines can (un)blank
 222  * the console on our behalf.
 223  */
 224 int (*console_blank_hook)(int);
 225
 226 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 227 static int blank_state;
 228 static int blank_timer_expired;
 229 enum {
 230         blank_off = 0,
 231         blank_normal_wait,
 232         blank_vesa_wait,
 233 };
 234
 235 /*
 236  * Notifier list for console events.
 237  */
 238 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 239
 240 int register_vt_notifier(struct notifier_block *nb)
 241 {
 242         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 243 }
 244 EXPORT_SYMBOL_GPL(register_vt_notifier);
 245
 246 int unregister_vt_notifier(struct notifier_block *nb)
 247 {
 248         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 249 }
 250 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 251
 252 static void notify_write(struct vc_data *vc, unsigned int unicode)
 253 {
 254         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 255         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 256 }
 257
 258 static void notify_update(struct vc_data *vc)
 259 {
 260         struct vt_notifier_param param = { .vc = vc };
 261         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 262 }
 263 /*
 264  *      Low-Level Functions
 265  */
 266
 267 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 268
 269 #ifdef VT_BUF_VRAM_ONLY
 270 #define DO_UPDATE(vc)   0
 271 #else
 272 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 273 #endif
 274
 275 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 276 {
 277         unsigned short *p;
 278
 279         if (!viewed)
 280                 p = (unsigned short *)(vc->vc_origin + offset);
 281         else if (!vc->vc_sw->con_screen_pos)
 282                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 283         else
 284                 p = vc->vc_sw->con_screen_pos(vc, offset);
 285         return p;
 286 }
 287
 288 static inline void scrolldelta(int lines)
 289 {
 290         scrollback_delta += lines;
 291         schedule_console_callback();
 292 }
 293
 294 void schedule_console_callback(void)
 295 {
 296         schedule_work(&console_work);
 297 }
 298
 299 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 300 {
 301         unsigned short *d, *s;
 302
 303         if (t+nr >= b)
 304                 nr = b - t - 1;
 305         if (b > vc->vc_rows || t >= b || nr < 1)
 306                 return;
 307         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 308                 return;
 309         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 310         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 311         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 312         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 313                     vc->vc_size_row * nr);
 314 }
 315
 316 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 317 {
 318         unsigned short *s;
 319         unsigned int step;
 320
 321         if (t+nr >= b)
 322                 nr = b - t - 1;
 323         if (b > vc->vc_rows || t >= b || nr < 1)
 324                 return;
 325         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 326                 return;
 327         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 328         step = vc->vc_cols * nr;
 329         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 330         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 331 }
 332
 333 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 334 {
 335 #ifndef VT_BUF_VRAM_ONLY
 336         unsigned int xx, yy, offset;
 337         u16 *p;
 338
 339         p = (u16 *) start;
 340         if (!vc->vc_sw->con_getxy) {
 341                 offset = (start - vc->vc_origin) / 2;
 342                 xx = offset % vc->vc_cols;
 343                 yy = offset / vc->vc_cols;
 344         } else {
 345                 int nxx, nyy;
 346                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 347                 xx = nxx; yy = nyy;
 348         }
 349         for(;;) {
 350                 u16 attrib = scr_readw(p) & 0xff00;
 351                 int startx = xx;
 352                 u16 *q = p;
 353                 while (xx < vc->vc_cols && count) {
 354                         if (attrib != (scr_readw(p) & 0xff00)) {
 355                                 if (p > q)
 356                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 357                                 startx = xx;
 358                                 q = p;
 359                                 attrib = scr_readw(p) & 0xff00;
 360                         }
 361                         p++;
 362                         xx++;
 363                         count--;
 364                 }
 365                 if (p > q)
 366                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 367                 if (!count)
 368                         break;
 369                 xx = 0;
 370                 yy++;
 371                 if (vc->vc_sw->con_getxy) {
 372                         p = (u16 *)start;
 373                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 374                 }
 375         }
 376 #endif
 377 }
 378
 379 void update_region(struct vc_data *vc, unsigned long start, int count)
 380 {
 381         WARN_CONSOLE_UNLOCKED();
 382
 383         if (DO_UPDATE(vc)) {
 384                 hide_cursor(vc);
 385                 do_update_region(vc, start, count);
 386                 set_cursor(vc);
 387         }
 388 }
 389
 390 /* Structure of attributes is hardware-dependent */
 391
 392 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 393     u8 _underline, u8 _reverse, u8 _italic)
 394 {
 395         if (vc->vc_sw->con_build_attr)
 396                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 397                        _blink, _underline, _reverse, _italic);
 398
 399 #ifndef VT_BUF_VRAM_ONLY
 400 /*
 401  * ++roman: I completely changed the attribute format for monochrome
 402  * mode (!can_do_color). The formerly used MDA (monochrome display
 403  * adapter) format didn't allow the combination of certain effects.
 404  * Now the attribute is just a bit vector:
 405  *  Bit 0..1: intensity (0..2)
 406  *  Bit 2   : underline
 407  *  Bit 3   : reverse
 408  *  Bit 7   : blink
 409  */
 410         {
 411         u8 a = _color;
 412         if (!vc->vc_can_do_color)
 413                 return _intensity |
 414                        (_italic ? 2 : 0) |
 415                        (_underline ? 4 : 0) |
 416                        (_reverse ? 8 : 0) |
 417                        (_blink ? 0x80 : 0);
 418         if (_italic)
 419                 a = (a & 0xF0) | vc->vc_itcolor;
 420         else if (_underline)
 421                 a = (a & 0xf0) | vc->vc_ulcolor;
 422         else if (_intensity == 0)
 423                 a = (a & 0xf0) | vc->vc_ulcolor;
 424         if (_reverse)
 425                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 426         if (_blink)
 427                 a ^= 0x80;
 428         if (_intensity == 2)
 429                 a ^= 0x08;
 430         if (vc->vc_hi_font_mask == 0x100)
 431                 a <<= 1;
 432         return a;
 433         }
 434 #else
 435         return 0;
 436 #endif
 437 }
 438
 439 static void update_attr(struct vc_data *vc)
 440 {
 441         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 442                       vc->vc_blink, vc->vc_underline,
 443                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 444         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 445 }
 446
 447 /* Note: inverting the screen twice should revert to the original state */
 448 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 449 {
 450         unsigned short *p;
 451
 452         WARN_CONSOLE_UNLOCKED();
 453
 454         count /= 2;
 455         p = screenpos(vc, offset, viewed);
 456         if (vc->vc_sw->con_invert_region)
 457                 vc->vc_sw->con_invert_region(vc, p, count);
 458 #ifndef VT_BUF_VRAM_ONLY
 459         else {
 460                 u16 *q = p;
 461                 int cnt = count;
 462                 u16 a;
 463
 464                 if (!vc->vc_can_do_color) {
 465                         while (cnt--) {
 466                             a = scr_readw(q);
 467                             a ^= 0x0800;
 468                             scr_writew(a, q);
 469                             q++;
 470                         }
 471                 } else if (vc->vc_hi_font_mask == 0x100) {
 472                         while (cnt--) {
 473                                 a = scr_readw(q);
 474                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 475                                 scr_writew(a, q);
 476                                 q++;
 477                         }
 478                 } else {
 479                         while (cnt--) {
 480                                 a = scr_readw(q);
 481                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 482                                 scr_writew(a, q);
 483                                 q++;
 484                         }
 485                 }
 486         }
 487 #endif
 488         if (DO_UPDATE(vc))
 489                 do_update_region(vc, (unsigned long) p, count);
 490 }
 491
 492 /* used by selection: complement pointer position */
 493 void complement_pos(struct vc_data *vc, int offset)
 494 {
 495         static int old_offset = -1;
 496         static unsigned short old;
 497         static unsigned short oldx, oldy;
 498
 499         WARN_CONSOLE_UNLOCKED();
 500
 501         if (old_offset != -1 && old_offset >= 0 &&
 502             old_offset < vc->vc_screenbuf_size) {
 503                 scr_writew(old, screenpos(vc, old_offset, 1));
 504                 if (DO_UPDATE(vc))
 505                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 506         }
 507
 508         old_offset = offset;
 509
 510         if (offset != -1 && offset >= 0 &&
 511             offset < vc->vc_screenbuf_size) {
 512                 unsigned short new;
 513                 unsigned short *p;
 514                 p = screenpos(vc, offset, 1);
 515                 old = scr_readw(p);
 516                 new = old ^ vc->vc_complement_mask;
 517                 scr_writew(new, p);
 518                 if (DO_UPDATE(vc)) {
 519                         oldx = (offset >> 1) % vc->vc_cols;
 520                         oldy = (offset >> 1) / vc->vc_cols;
 521                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 522                 }
 523         }
 524
 525 }
 526
 527 static void insert_char(struct vc_data *vc, unsigned int nr)
 528 {
 529         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 530
 531         p = q + vc->vc_cols - nr - vc->vc_x;
 532         while (--p >= q)
 533                 scr_writew(scr_readw(p), p + nr);
 534         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 535         vc->vc_need_wrap = 0;
 536         if (DO_UPDATE(vc)) {
 537                 unsigned short oldattr = vc->vc_attr;
 538                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 539                                      vc->vc_cols - vc->vc_x - nr);
 540                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 541                 while (nr--)
 542                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 543                 vc->vc_attr = oldattr;
 544         }
 545 }
 546
 547 static void delete_char(struct vc_data *vc, unsigned int nr)
 548 {
 549         unsigned int i = vc->vc_x;
 550         unsigned short *p = (unsigned short *)vc->vc_pos;
 551
 552         while (++i <= vc->vc_cols - nr) {
 553                 scr_writew(scr_readw(p+nr), p);
 554                 p++;
 555         }
 556         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 557         vc->vc_need_wrap = 0;
 558         if (DO_UPDATE(vc)) {
 559                 unsigned short oldattr = vc->vc_attr;
 560                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 561                                      vc->vc_cols - vc->vc_x - nr);
 562                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 563                 while (nr--)
 564                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 565                                      vc->vc_cols - 1 - nr);
 566                 vc->vc_attr = oldattr;
 567         }
 568 }
 569
 570 static int softcursor_original;
 571
 572 static void add_softcursor(struct vc_data *vc)
 573 {
 574         int i = scr_readw((u16 *) vc->vc_pos);
 575         u32 type = vc->vc_cursor_type;
 576
 577         if (! (type & 0x10)) return;
 578         if (softcursor_original != -1) return;
 579         softcursor_original = i;
 580         i |= ((type >> 8) & 0xff00 );
 581         i ^= ((type) & 0xff00 );
 582         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 583         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 584         scr_writew(i, (u16 *) vc->vc_pos);
 585         if (DO_UPDATE(vc))
 586                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 587 }
 588
 589 static void hide_softcursor(struct vc_data *vc)
 590 {
 591         if (softcursor_original != -1) {
 592                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 593                 if (DO_UPDATE(vc))
 594                         vc->vc_sw->con_putc(vc, softcursor_original,
 595                                         vc->vc_y, vc->vc_x);
 596                 softcursor_original = -1;
 597         }
 598 }
 599
 600 static void hide_cursor(struct vc_data *vc)
 601 {
 602         if (vc == sel_cons)
 603                 clear_selection();
 604         vc->vc_sw->con_cursor(vc, CM_ERASE);
 605         hide_softcursor(vc);
 606 }
 607
 608 static void set_cursor(struct vc_data *vc)
 609 {
 610         if (!IS_FG(vc) || console_blanked ||
 611             vc->vc_mode == KD_GRAPHICS)
 612                 return;
 613         if (vc->vc_deccm) {
 614                 if (vc == sel_cons)
 615                         clear_selection();
 616                 add_softcursor(vc);
 617                 if ((vc->vc_cursor_type & 0x0f) != 1)
 618                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 619         } else
 620                 hide_cursor(vc);
 621 }
 622
 623 static void set_origin(struct vc_data *vc)
 624 {
 625         WARN_CONSOLE_UNLOCKED();
 626
 627         if (!CON_IS_VISIBLE(vc) ||
 628             !vc->vc_sw->con_set_origin ||
 629             !vc->vc_sw->con_set_origin(vc))
 630                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 631         vc->vc_visible_origin = vc->vc_origin;
 632         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 633         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 634 }
 635
 636 static inline void save_screen(struct vc_data *vc)
 637 {
 638         WARN_CONSOLE_UNLOCKED();
 639
 640         if (vc->vc_sw->con_save_screen)
 641                 vc->vc_sw->con_save_screen(vc);
 642 }
 643
 644 /*
 645  *      Redrawing of screen
 646  */
 647
 648 static void clear_buffer_attributes(struct vc_data *vc)
 649 {
 650         unsigned short *p = (unsigned short *)vc->vc_origin;
 651         int count = vc->vc_screenbuf_size / 2;
 652         int mask = vc->vc_hi_font_mask | 0xff;
 653
 654         for (; count > 0; count--, p++) {
 655                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 656         }
 657 }
 658
 659 void redraw_screen(struct vc_data *vc, int is_switch)
 660 {
 661         int redraw = 0;
 662
 663         WARN_CONSOLE_UNLOCKED();
 664
 665         if (!vc) {
 666                 /* strange ... */
 667                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 668                 return;
 669         }
 670
 671         if (is_switch) {
 672                 struct vc_data *old_vc = vc_cons[fg_console].d;
 673                 if (old_vc == vc)
 674                         return;
 675                 if (!CON_IS_VISIBLE(vc))
 676                         redraw = 1;
 677                 *vc->vc_display_fg = vc;
 678                 fg_console = vc->vc_num;
 679                 hide_cursor(old_vc);
 680                 if (!CON_IS_VISIBLE(old_vc)) {
 681                         save_screen(old_vc);
 682                         set_origin(old_vc);
 683                 }
 684         } else {
 685                 hide_cursor(vc);
 686                 redraw = 1;
 687         }
 688
 689         if (redraw) {
 690                 int update;
 691                 int old_was_color = vc->vc_can_do_color;
 692
 693                 set_origin(vc);
 694                 update = vc->vc_sw->con_switch(vc);
 695                 set_palette(vc);
 696                 /*
 697                  * If console changed from mono<->color, the best we can do
 698                  * is to clear the buffer attributes. As it currently stands,
 699                  * rebuilding new attributes from the old buffer is not doable
 700                  * without overly complex code.
 701                  */
 702                 if (old_was_color != vc->vc_can_do_color) {
 703                         update_attr(vc);
 704                         clear_buffer_attributes(vc);
 705                 }
 706                 if (update && vc->vc_mode != KD_GRAPHICS)
 707                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 708         }
 709         set_cursor(vc);
 710         if (is_switch) {
 711                 set_leds();
 712                 compute_shiftstate();
 713                 notify_update(vc);
 714         }
 715 }
 716
 717 /*
 718  *      Allocation, freeing and resizing of VTs.
 719  */
 720
 721 int vc_cons_allocated(unsigned int i)
 722 {
 723         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 724 }
 725
 726 static void visual_init(struct vc_data *vc, int num, int init)
 727 {
 728         /* ++Geert: vc->vc_sw->con_init determines console size */
 729         if (vc->vc_sw)
 730                 module_put(vc->vc_sw->owner);
 731         vc->vc_sw = conswitchp;
 732 #ifndef VT_SINGLE_DRIVER
 733         if (con_driver_map[num])
 734                 vc->vc_sw = con_driver_map[num];
 735 #endif
 736         __module_get(vc->vc_sw->owner);
 737         vc->vc_num = num;
 738         vc->vc_display_fg = &master_display_fg;
 739         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 740         vc->vc_uni_pagedir = 0;
 741         vc->vc_hi_font_mask = 0;
 742         vc->vc_complement_mask = 0;
 743         vc->vc_can_do_color = 0;
 744         vc->vc_sw->con_init(vc, init);
 745         if (!vc->vc_complement_mask)
 746                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 747         vc->vc_s_complement_mask = vc->vc_complement_mask;
 748         vc->vc_size_row = vc->vc_cols << 1;
 749         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 750 }
 751
 752 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 753 {
 754         WARN_CONSOLE_UNLOCKED();
 755
 756         if (currcons >= MAX_NR_CONSOLES)
 757                 return -ENXIO;
 758         if (!vc_cons[currcons].d) {
 759             struct vc_data *vc;
 760             struct vt_notifier_param param;
 761
 762             /* prevent users from taking too much memory */
 763             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 764               return -EPERM;
 765
 766             /* due to the granularity of kmalloc, we waste some memory here */
 767             /* the alloc is done in two steps, to optimize the common situation
 768                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 769             /* although the numbers above are not valid since long ago, the
 770                point is still up-to-date and the comment still has its value
 771                even if only as a historical artifact.  --mj, July 1998 */
 772             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 773             if (!vc)
 774                 return -ENOMEM;
 775             vc_cons[currcons].d = vc;
 776             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 777             visual_init(vc, currcons, 1);
 778             if (!*vc->vc_uni_pagedir_loc)
 779                 con_set_default_unimap(vc);
 780             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 781             if (!vc->vc_screenbuf) {
 782                 kfree(vc);
 783                 vc_cons[currcons].d = NULL;
 784                 return -ENOMEM;
 785             }
 786
 787             /* If no drivers have overridden us and the user didn't pass a
 788                boot option, default to displaying the cursor */
 789             if (global_cursor_default == -1)
 790                     global_cursor_default = 1;
 791
 792             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 793             vcs_make_sysfs(currcons);
 794             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 795         }
 796         return 0;
 797 }
 798
 799 static inline int resize_screen(struct vc_data *vc, int width, int height,
 800                                 int user)
 801 {
 802         /* Resizes the resolution of the display adapater */
 803         int err = 0;
 804
 805         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 806                 err = vc->vc_sw->con_resize(vc, width, height, user);
 807
 808         return err;
 809 }
 810
 811 /*
 812  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 813  * [this is to be used together with some user program
 814  * like resize that changes the hardware videomode]
 815  */
 816 #define VC_RESIZE_MAXCOL (32767)
 817 #define VC_RESIZE_MAXROW (32767)
 818
 819 /**
 820  *      vc_do_resize    -       resizing method for the tty
 821  *      @tty: tty being resized
 822  *      @real_tty: real tty (different to tty if a pty/tty pair)
 823  *      @vc: virtual console private data
 824  *      @cols: columns
 825  *      @lines: lines
 826  *
 827  *      Resize a virtual console, clipping according to the actual constraints.
 828  *      If the caller passes a tty structure then update the termios winsize
 829  *      information and perform any necessary signal handling.
 830  *
 831  *      Caller must hold the console semaphore. Takes the termios mutex and
 832  *      ctrl_lock of the tty IFF a tty is passed.
 833  */
 834
 835 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 836                                 unsigned int cols, unsigned int lines)
 837 {
 838         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 839         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 840         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 841         unsigned int end, user;
 842         unsigned short *newscreen;
 843
 844         WARN_CONSOLE_UNLOCKED();
 845
 846         if (!vc)
 847                 return -ENXIO;
 848
 849         user = vc->vc_resize_user;
 850         vc->vc_resize_user = 0;
 851
 852         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 853                 return -EINVAL;
 854
 855         new_cols = (cols ? cols : vc->vc_cols);
 856         new_rows = (lines ? lines : vc->vc_rows);
 857         new_row_size = new_cols << 1;
 858         new_screen_size = new_row_size * new_rows;
 859
 860         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 861                 return 0;
 862
 863         newscreen = kmalloc(new_screen_size, GFP_USER);
 864         if (!newscreen)
 865                 return -ENOMEM;
 866
 867         old_rows = vc->vc_rows;
 868         old_cols = vc->vc_cols;
 869         old_row_size = vc->vc_size_row;
 870         old_screen_size = vc->vc_screenbuf_size;
 871
 872         err = resize_screen(vc, new_cols, new_rows, user);
 873         if (err) {
 874                 kfree(newscreen);
 875                 return err;
 876         }
 877
 878         vc->vc_rows = new_rows;
 879         vc->vc_cols = new_cols;
 880         vc->vc_size_row = new_row_size;
 881         vc->vc_screenbuf_size = new_screen_size;
 882
 883         rlth = min(old_row_size, new_row_size);
 884         rrem = new_row_size - rlth;
 885         old_origin = vc->vc_origin;
 886         new_origin = (long) newscreen;
 887         new_scr_end = new_origin + new_screen_size;
 888
 889         if (vc->vc_y > new_rows) {
 890                 if (old_rows - vc->vc_y < new_rows) {
 891                         /*
 892                          * Cursor near the bottom, copy contents from the
 893                          * bottom of buffer
 894                          */
 895                         old_origin += (old_rows - new_rows) * old_row_size;
 896                         end = vc->vc_scr_end;
 897                 } else {
 898                         /*
 899                          * Cursor is in no man's land, copy 1/2 screenful
 900                          * from the top and bottom of cursor position
 901                          */
 902                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 903                         end = old_origin + (old_row_size * new_rows);
 904                 }
 905         } else
 906                 /*
 907                  * Cursor near the top, copy contents from the top of buffer
 908                  */
 909                 end = (old_rows > new_rows) ? old_origin +
 910                         (old_row_size * new_rows) :
 911                         vc->vc_scr_end;
 912
 913         update_attr(vc);
 914
 915         while (old_origin < end) {
 916                 scr_memcpyw((unsigned short *) new_origin,
 917                             (unsigned short *) old_origin, rlth);
 918                 if (rrem)
 919                         scr_memsetw((void *)(new_origin + rlth),
 920                                     vc->vc_video_erase_char, rrem);
 921                 old_origin += old_row_size;
 922                 new_origin += new_row_size;
 923         }
 924         if (new_scr_end > new_origin)
 925                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 926                             new_scr_end - new_origin);
 927         kfree(vc->vc_screenbuf);
 928         vc->vc_screenbuf = newscreen;
 929         vc->vc_screenbuf_size = new_screen_size;
 930         set_origin(vc);
 931
 932         /* do part of a reset_terminal() */
 933         vc->vc_top = 0;
 934         vc->vc_bottom = vc->vc_rows;
 935         gotoxy(vc, vc->vc_x, vc->vc_y);
 936         save_cur(vc);
 937
 938         if (tty) {
 939                 /* Rewrite the requested winsize data with the actual
 940                    resulting sizes */
 941                 struct winsize ws;
 942                 memset(&ws, 0, sizeof(ws));
 943                 ws.ws_row = vc->vc_rows;
 944                 ws.ws_col = vc->vc_cols;
 945                 ws.ws_ypixel = vc->vc_scan_lines;
 946                 tty_do_resize(tty, &ws);
 947         }
 948
 949         if (CON_IS_VISIBLE(vc))
 950                 update_screen(vc);
 951         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 952         return err;
 953 }
 954
 955 /**
 956  *      vc_resize               -       resize a VT
 957  *      @vc: virtual console
 958  *      @cols: columns
 959  *      @rows: rows
 960  *
 961  *      Resize a virtual console as seen from the console end of things. We
 962  *      use the common vc_do_resize methods to update the structures. The
 963  *      caller must hold the console sem to protect console internals and
 964  *      vc->vc_tty
 965  */
 966
 967 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 968 {
 969         return vc_do_resize(vc->vc_tty, vc, cols, rows);
 970 }
 971
 972 /**
 973  *      vt_resize               -       resize a VT
 974  *      @tty: tty to resize
 975  *      @ws: winsize attributes
 976  *
 977  *      Resize a virtual terminal. This is called by the tty layer as we
 978  *      register our own handler for resizing. The mutual helper does all
 979  *      the actual work.
 980  *
 981  *      Takes the console sem and the called methods then take the tty
 982  *      termios_mutex and the tty ctrl_lock in that order.
 983  */
 984 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 985 {
 986         struct vc_data *vc = tty->driver_data;
 987         int ret;
 988
 989         acquire_console_sem();
 990         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 991         release_console_sem();
 992         return ret;
 993 }
 994
 995 void vc_deallocate(unsigned int currcons)
 996 {
 997         WARN_CONSOLE_UNLOCKED();
 998
 999         if (vc_cons_allocated(currcons)) {
1000                 struct vc_data *vc = vc_cons[currcons].d;
1001                 struct vt_notifier_param param = { .vc = vc };
1002
1003                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1004                 vcs_remove_sysfs(currcons);
1005                 vc->vc_sw->con_deinit(vc);
1006                 put_pid(vc->vt_pid);
1007                 module_put(vc->vc_sw->owner);
1008                 kfree(vc->vc_screenbuf);
1009                 if (currcons >= MIN_NR_CONSOLES)
1010                         kfree(vc);
1011                 vc_cons[currcons].d = NULL;
1012         }
1013 }
1014
1015 /*
1016  *      VT102 emulator
1017  */
1018
1019 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1020 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1021 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1022
1023 #define decarm          VC_REPEAT
1024 #define decckm          VC_CKMODE
1025 #define kbdapplic       VC_APPLIC
1026 #define lnm             VC_CRLF
1027
1028 /*
1029  * this is what the terminal answers to a ESC-Z or csi0c query.
1030  */
1031 #define VT100ID "\033[?1;2c"
1032 #define VT102ID "\033[?6c"
1033
1034 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1035                                        8,12,10,14, 9,13,11,15 };
1036
1037 /* the default colour table, for VGA+ colour systems */
1038 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1039     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1040 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1041     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1042 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1043     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1044
1045 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1046 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1047 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1048
1049 /*
1050  * gotoxy() must verify all boundaries, because the arguments
1051  * might also be negative. If the given position is out of
1052  * bounds, the cursor is placed at the nearest margin.
1053  */
1054 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1055 {
1056         int min_y, max_y;
1057
1058         if (new_x < 0)
1059                 vc->vc_x = 0;
1060         else {
1061                 if (new_x >= vc->vc_cols)
1062                         vc->vc_x = vc->vc_cols - 1;
1063                 else
1064                         vc->vc_x = new_x;
1065         }
1066
1067         if (vc->vc_decom) {
1068                 min_y = vc->vc_top;
1069                 max_y = vc->vc_bottom;
1070         } else {
1071                 min_y = 0;
1072                 max_y = vc->vc_rows;
1073         }
1074         if (new_y < min_y)
1075                 vc->vc_y = min_y;
1076         else if (new_y >= max_y)
1077                 vc->vc_y = max_y - 1;
1078         else
1079                 vc->vc_y = new_y;
1080         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1081         vc->vc_need_wrap = 0;
1082 }
1083
1084 /* for absolute user moves, when decom is set */
1085 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1086 {
1087         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1088 }
1089
1090 void scrollback(struct vc_data *vc, int lines)
1091 {
1092         if (!lines)
1093                 lines = vc->vc_rows / 2;
1094         scrolldelta(-lines);
1095 }
1096
1097 void scrollfront(struct vc_data *vc, int lines)
1098 {
1099         if (!lines)
1100                 lines = vc->vc_rows / 2;
1101         scrolldelta(lines);
1102 }
1103
1104 static void lf(struct vc_data *vc)
1105 {
1106         /* don't scroll if above bottom of scrolling region, or
1107          * if below scrolling region
1108          */
1109         if (vc->vc_y + 1 == vc->vc_bottom)
1110                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1111         else if (vc->vc_y < vc->vc_rows - 1) {
1112                 vc->vc_y++;
1113                 vc->vc_pos += vc->vc_size_row;
1114         }
1115         vc->vc_need_wrap = 0;
1116         notify_write(vc, '\n');
1117 }
1118
1119 static void ri(struct vc_data *vc)
1120 {
1121         /* don't scroll if below top of scrolling region, or
1122          * if above scrolling region
1123          */
1124         if (vc->vc_y == vc->vc_top)
1125                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1126         else if (vc->vc_y > 0) {
1127                 vc->vc_y--;
1128                 vc->vc_pos -= vc->vc_size_row;
1129         }
1130         vc->vc_need_wrap = 0;
1131 }
1132
1133 static inline void cr(struct vc_data *vc)
1134 {
1135         vc->vc_pos -= vc->vc_x << 1;
1136         vc->vc_need_wrap = vc->vc_x = 0;
1137         notify_write(vc, '\r');
1138 }
1139
1140 static inline void bs(struct vc_data *vc)
1141 {
1142         if (vc->vc_x) {
1143                 vc->vc_pos -= 2;
1144                 vc->vc_x--;
1145                 vc->vc_need_wrap = 0;
1146                 notify_write(vc, '\b');
1147         }
1148 }
1149
1150 static inline void del(struct vc_data *vc)
1151 {
1152         /* ignored */
1153 }
1154
1155 static void csi_J(struct vc_data *vc, int vpar)
1156 {
1157         unsigned int count;
1158         unsigned short * start;
1159
1160         switch (vpar) {
1161                 case 0: /* erase from cursor to end of display */
1162                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1163                         start = (unsigned short *)vc->vc_pos;
1164                         if (DO_UPDATE(vc)) {
1165                                 /* do in two stages */
1166                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1167                                               vc->vc_cols - vc->vc_x);
1168                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1169                                               vc->vc_rows - vc->vc_y - 1,
1170                                               vc->vc_cols);
1171                         }
1172                         break;
1173                 case 1: /* erase from start to cursor */
1174                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1175                         start = (unsigned short *)vc->vc_origin;
1176                         if (DO_UPDATE(vc)) {
1177                                 /* do in two stages */
1178                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1179                                               vc->vc_cols);
1180                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1181                                               vc->vc_x + 1);
1182                         }
1183                         break;
1184                 case 2: /* erase whole display */
1185                         count = vc->vc_cols * vc->vc_rows;
1186                         start = (unsigned short *)vc->vc_origin;
1187                         if (DO_UPDATE(vc))
1188                                 vc->vc_sw->con_clear(vc, 0, 0,
1189                                               vc->vc_rows,
1190                                               vc->vc_cols);
1191                         break;
1192                 default:
1193                         return;
1194         }
1195         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1196         vc->vc_need_wrap = 0;
1197 }
1198
1199 static void csi_K(struct vc_data *vc, int vpar)
1200 {
1201         unsigned int count;
1202         unsigned short * start;
1203
1204         switch (vpar) {
1205                 case 0: /* erase from cursor to end of line */
1206                         count = vc->vc_cols - vc->vc_x;
1207                         start = (unsigned short *)vc->vc_pos;
1208                         if (DO_UPDATE(vc))
1209                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1210                                                      vc->vc_cols - vc->vc_x);
1211                         break;
1212                 case 1: /* erase from start of line to cursor */
1213                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1214                         count = vc->vc_x + 1;
1215                         if (DO_UPDATE(vc))
1216                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1217                                                      vc->vc_x + 1);
1218                         break;
1219                 case 2: /* erase whole line */
1220                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1221                         count = vc->vc_cols;
1222                         if (DO_UPDATE(vc))
1223                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1224                                               vc->vc_cols);
1225                         break;
1226                 default:
1227                         return;
1228         }
1229         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1230         vc->vc_need_wrap = 0;
1231 }
1232
1233 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1234 {                                         /* not vt100? */
1235         int count;
1236
1237         if (!vpar)
1238                 vpar++;
1239         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1240
1241         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1242         if (DO_UPDATE(vc))
1243                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1244         vc->vc_need_wrap = 0;
1245 }
1246
1247 static void default_attr(struct vc_data *vc)
1248 {
1249         vc->vc_intensity = 1;
1250         vc->vc_italic = 0;
1251         vc->vc_underline = 0;
1252         vc->vc_reverse = 0;
1253         vc->vc_blink = 0;
1254         vc->vc_color = vc->vc_def_color;
1255 }
1256
1257 /* console_sem is held */
1258 static void csi_m(struct vc_data *vc)
1259 {
1260         int i;
1261
1262         for (i = 0; i <= vc->vc_npar; i++)
1263                 switch (vc->vc_par[i]) {
1264                         case 0: /* all attributes off */
1265                                 default_attr(vc);
1266                                 break;
1267                         case 1:
1268                                 vc->vc_intensity = 2;
1269                                 break;
1270                         case 2:
1271                                 vc->vc_intensity = 0;
1272                                 break;
1273                         case 3:
1274                                 vc->vc_italic = 1;
1275                                 break;
1276                         case 4:
1277                                 vc->vc_underline = 1;
1278                                 break;
1279                         case 5:
1280                                 vc->vc_blink = 1;
1281                                 break;
1282                         case 7:
1283                                 vc->vc_reverse = 1;
1284                                 break;
1285                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1286                                   * Select primary font, don't display
1287                                   * control chars if defined, don't set
1288                                   * bit 8 on output.
1289                                   */
1290                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1291                                                 ? vc->vc_G0_charset
1292                                                 : vc->vc_G1_charset, vc);
1293                                 vc->vc_disp_ctrl = 0;
1294                                 vc->vc_toggle_meta = 0;
1295                                 break;
1296                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1297                                   * Select first alternate font, lets
1298                                   * chars < 32 be displayed as ROM chars.
1299                                   */
1300                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1301                                 vc->vc_disp_ctrl = 1;
1302                                 vc->vc_toggle_meta = 0;
1303                                 break;
1304                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1305                                   * Select second alternate font, toggle
1306                                   * high bit before displaying as ROM char.
1307                                   */
1308                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1309                                 vc->vc_disp_ctrl = 1;
1310                                 vc->vc_toggle_meta = 1;
1311                                 break;
1312                         case 21:
1313                         case 22:
1314                                 vc->vc_intensity = 1;
1315                                 break;
1316                         case 23:
1317                                 vc->vc_italic = 0;
1318                                 break;
1319                         case 24:
1320                                 vc->vc_underline = 0;
1321                                 break;
1322                         case 25:
1323                                 vc->vc_blink = 0;
1324                                 break;
1325                         case 27:
1326                                 vc->vc_reverse = 0;
1327                                 break;
1328                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1329                                   * Enables underscore, white foreground
1330                                   * with white underscore (Linux - use
1331                                   * default foreground).
1332                                   */
1333                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1334                                 vc->vc_underline = 1;
1335                                 break;
1336                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1337                                   * Disable underline option.
1338                                   * Reset colour to default? It did this
1339                                   * before...
1340                                   */
1341                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1342                                 vc->vc_underline = 0;
1343                                 break;
1344                         case 49:
1345                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1346                                 break;
1347                         default:
1348                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1349                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1350                                                 | (vc->vc_color & 0xf0);
1351                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1352                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1353                                                 | (vc->vc_color & 0x0f);
1354                                 break;
1355                 }
1356         update_attr(vc);
1357 }
1358
1359 static void respond_string(const char *p, struct tty_struct *tty)
1360 {
1361         while (*p) {
1362                 tty_insert_flip_char(tty, *p, 0);
1363                 p++;
1364         }
1365         con_schedule_flip(tty);
1366 }
1367
1368 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1369 {
1370         char buf[40];
1371
1372         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1373         respond_string(buf, tty);
1374 }
1375
1376 static inline void status_report(struct tty_struct *tty)
1377 {
1378         respond_string("\033[0n", tty); /* Terminal ok */
1379 }
1380
1381 static inline void respond_ID(struct tty_struct * tty)
1382 {
1383         respond_string(VT102ID, tty);
1384 }
1385
1386 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1387 {
1388         char buf[8];
1389
1390         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1391                 (char)('!' + mry));
1392         respond_string(buf, tty);
1393 }
1394
1395 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1396 int mouse_reporting(void)
1397 {
1398         return vc_cons[fg_console].d->vc_report_mouse;
1399 }
1400
1401 /* console_sem is held */
1402 static void set_mode(struct vc_data *vc, int on_off)
1403 {
1404         int i;
1405
1406         for (i = 0; i <= vc->vc_npar; i++)
1407                 if (vc->vc_ques) {
1408                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1409                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1410                                 if (on_off)
1411                                         set_kbd(vc, decckm);
1412                                 else
1413                                         clr_kbd(vc, decckm);
1414                                 break;
1415                         case 3: /* 80/132 mode switch unimplemented */
1416                                 vc->vc_deccolm = on_off;
1417 #if 0
1418                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1419                                 /* this alone does not suffice; some user mode
1420                                    utility has to change the hardware regs */
1421 #endif
1422                                 break;
1423                         case 5:                 /* Inverted screen on/off */
1424                                 if (vc->vc_decscnm != on_off) {
1425                                         vc->vc_decscnm = on_off;
1426                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1427                                         update_attr(vc);
1428                                 }
1429                                 break;
1430                         case 6:                 /* Origin relative/absolute */
1431                                 vc->vc_decom = on_off;
1432                                 gotoxay(vc, 0, 0);
1433                                 break;
1434                         case 7:                 /* Autowrap on/off */
1435                                 vc->vc_decawm = on_off;
1436                                 break;
1437                         case 8:                 /* Autorepeat on/off */
1438                                 if (on_off)
1439                                         set_kbd(vc, decarm);
1440                                 else
1441                                         clr_kbd(vc, decarm);
1442                                 break;
1443                         case 9:
1444                                 vc->vc_report_mouse = on_off ? 1 : 0;
1445                                 break;
1446                         case 25:                /* Cursor on/off */
1447                                 vc->vc_deccm = on_off;
1448                                 break;
1449                         case 1000:
1450                                 vc->vc_report_mouse = on_off ? 2 : 0;
1451                                 break;
1452                         }
1453                 } else {
1454                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1455                         case 3:                 /* Monitor (display ctrls) */
1456                                 vc->vc_disp_ctrl = on_off;
1457                                 break;
1458                         case 4:                 /* Insert Mode on/off */
1459                                 vc->vc_decim = on_off;
1460                                 break;
1461                         case 20:                /* Lf, Enter == CrLf/Lf */
1462                                 if (on_off)
1463                                         set_kbd(vc, lnm);
1464                                 else
1465                                         clr_kbd(vc, lnm);
1466                                 break;
1467                         }
1468                 }
1469 }
1470
1471 /* console_sem is held */
1472 static void setterm_command(struct vc_data *vc)
1473 {
1474         switch(vc->vc_par[0]) {
1475                 case 1: /* set color for underline mode */
1476                         if (vc->vc_can_do_color &&
1477                                         vc->vc_par[1] < 16) {
1478                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1479                                 if (vc->vc_underline)
1480                                         update_attr(vc);
1481                         }
1482                         break;
1483                 case 2: /* set color for half intensity mode */
1484                         if (vc->vc_can_do_color &&
1485                                         vc->vc_par[1] < 16) {
1486                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1487                                 if (vc->vc_intensity == 0)
1488                                         update_attr(vc);
1489                         }
1490                         break;
1491                 case 8: /* store colors as defaults */
1492                         vc->vc_def_color = vc->vc_attr;
1493                         if (vc->vc_hi_font_mask == 0x100)
1494                                 vc->vc_def_color >>= 1;
1495                         default_attr(vc);
1496                         update_attr(vc);
1497                         break;
1498                 case 9: /* set blanking interval */
1499                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1500                         poke_blanked_console();
1501                         break;
1502                 case 10: /* set bell frequency in Hz */
1503                         if (vc->vc_npar >= 1)
1504                                 vc->vc_bell_pitch = vc->vc_par[1];
1505                         else
1506                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1507                         break;
1508                 case 11: /* set bell duration in msec */
1509                         if (vc->vc_npar >= 1)
1510                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1511                                         vc->vc_par[1] * HZ / 1000 : 0;
1512                         else
1513                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1514                         break;
1515                 case 12: /* bring specified console to the front */
1516                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1517                                 set_console(vc->vc_par[1] - 1);
1518                         break;
1519                 case 13: /* unblank the screen */
1520                         poke_blanked_console();
1521                         break;
1522                 case 14: /* set vesa powerdown interval */
1523                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1524                         break;
1525                 case 15: /* activate the previous console */
1526                         set_console(last_console);
1527                         break;
1528         }
1529 }
1530
1531 /* console_sem is held */
1532 static void csi_at(struct vc_data *vc, unsigned int nr)
1533 {
1534         if (nr > vc->vc_cols - vc->vc_x)
1535                 nr = vc->vc_cols - vc->vc_x;
1536         else if (!nr)
1537                 nr = 1;
1538         insert_char(vc, nr);
1539 }
1540
1541 /* console_sem is held */
1542 static void csi_L(struct vc_data *vc, unsigned int nr)
1543 {
1544         if (nr > vc->vc_rows - vc->vc_y)
1545                 nr = vc->vc_rows - vc->vc_y;
1546         else if (!nr)
1547                 nr = 1;
1548         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1549         vc->vc_need_wrap = 0;
1550 }
1551
1552 /* console_sem is held */
1553 static void csi_P(struct vc_data *vc, unsigned int nr)
1554 {
1555         if (nr > vc->vc_cols - vc->vc_x)
1556                 nr = vc->vc_cols - vc->vc_x;
1557         else if (!nr)
1558                 nr = 1;
1559         delete_char(vc, nr);
1560 }
1561
1562 /* console_sem is held */
1563 static void csi_M(struct vc_data *vc, unsigned int nr)
1564 {
1565         if (nr > vc->vc_rows - vc->vc_y)
1566                 nr = vc->vc_rows - vc->vc_y;
1567         else if (!nr)
1568                 nr=1;
1569         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1570         vc->vc_need_wrap = 0;
1571 }
1572
1573 /* console_sem is held (except via vc_init->reset_terminal */
1574 static void save_cur(struct vc_data *vc)
1575 {
1576         vc->vc_saved_x          = vc->vc_x;
1577         vc->vc_saved_y          = vc->vc_y;
1578         vc->vc_s_intensity      = vc->vc_intensity;
1579         vc->vc_s_italic         = vc->vc_italic;
1580         vc->vc_s_underline      = vc->vc_underline;
1581         vc->vc_s_blink          = vc->vc_blink;
1582         vc->vc_s_reverse        = vc->vc_reverse;
1583         vc->vc_s_charset        = vc->vc_charset;
1584         vc->vc_s_color          = vc->vc_color;
1585         vc->vc_saved_G0         = vc->vc_G0_charset;
1586         vc->vc_saved_G1         = vc->vc_G1_charset;
1587 }
1588
1589 /* console_sem is held */
1590 static void restore_cur(struct vc_data *vc)
1591 {
1592         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1593         vc->vc_intensity        = vc->vc_s_intensity;
1594         vc->vc_italic           = vc->vc_s_italic;
1595         vc->vc_underline        = vc->vc_s_underline;
1596         vc->vc_blink            = vc->vc_s_blink;
1597         vc->vc_reverse          = vc->vc_s_reverse;
1598         vc->vc_charset          = vc->vc_s_charset;
1599         vc->vc_color            = vc->vc_s_color;
1600         vc->vc_G0_charset       = vc->vc_saved_G0;
1601         vc->vc_G1_charset       = vc->vc_saved_G1;
1602         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1603         update_attr(vc);
1604         vc->vc_need_wrap = 0;
1605 }
1606
1607 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1608         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1609         ESpalette };
1610
1611 /* console_sem is held (except via vc_init()) */
1612 static void reset_terminal(struct vc_data *vc, int do_clear)
1613 {
1614         vc->vc_top              = 0;
1615         vc->vc_bottom           = vc->vc_rows;
1616         vc->vc_state            = ESnormal;
1617         vc->vc_ques             = 0;
1618         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1619         vc->vc_G0_charset       = LAT1_MAP;
1620         vc->vc_G1_charset       = GRAF_MAP;
1621         vc->vc_charset          = 0;
1622         vc->vc_need_wrap        = 0;
1623         vc->vc_report_mouse     = 0;
1624         vc->vc_utf              = default_utf8;
1625         vc->vc_utf_count        = 0;
1626
1627         vc->vc_disp_ctrl        = 0;
1628         vc->vc_toggle_meta      = 0;
1629
1630         vc->vc_decscnm          = 0;
1631         vc->vc_decom            = 0;
1632         vc->vc_decawm           = 1;
1633         vc->vc_deccm            = global_cursor_default;
1634         vc->vc_decim            = 0;
1635
1636         set_kbd(vc, decarm);
1637         clr_kbd(vc, decckm);
1638         clr_kbd(vc, kbdapplic);
1639         clr_kbd(vc, lnm);
1640         kbd_table[vc->vc_num].lockstate = 0;
1641         kbd_table[vc->vc_num].slockstate = 0;
1642         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1643         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1644         /* do not do set_leds here because this causes an endless tasklet loop
1645            when the keyboard hasn't been initialized yet */
1646
1647         vc->vc_cursor_type = cur_default;
1648         vc->vc_complement_mask = vc->vc_s_complement_mask;
1649
1650         default_attr(vc);
1651         update_attr(vc);
1652
1653         vc->vc_tab_stop[0]      = 0x01010100;
1654         vc->vc_tab_stop[1]      =
1655         vc->vc_tab_stop[2]      =
1656         vc->vc_tab_stop[3]      =
1657         vc->vc_tab_stop[4]      =
1658         vc->vc_tab_stop[5]      =
1659         vc->vc_tab_stop[6]      =
1660         vc->vc_tab_stop[7]      = 0x01010101;
1661
1662         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1663         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1664
1665         gotoxy(vc, 0, 0);
1666         save_cur(vc);
1667         if (do_clear)
1668             csi_J(vc, 2);
1669 }
1670
1671 /* console_sem is held */
1672 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1673 {
1674         /*
1675          *  Control characters can be used in the _middle_
1676          *  of an escape sequence.
1677          */
1678         switch (c) {
1679         case 0:
1680                 return;
1681         case 7:
1682                 if (vc->vc_bell_duration)
1683                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1684                 return;
1685         case 8:
1686                 bs(vc);
1687                 return;
1688         case 9:
1689                 vc->vc_pos -= (vc->vc_x << 1);
1690                 while (vc->vc_x < vc->vc_cols - 1) {
1691                         vc->vc_x++;
1692                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1693                                 break;
1694                 }
1695                 vc->vc_pos += (vc->vc_x << 1);
1696                 notify_write(vc, '\t');
1697                 return;
1698         case 10: case 11: case 12:
1699                 lf(vc);
1700                 if (!is_kbd(vc, lnm))
1701                         return;
1702         case 13:
1703                 cr(vc);
1704                 return;
1705         case 14:
1706                 vc->vc_charset = 1;
1707                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1708                 vc->vc_disp_ctrl = 1;
1709                 return;
1710         case 15:
1711                 vc->vc_charset = 0;
1712                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1713                 vc->vc_disp_ctrl = 0;
1714                 return;
1715         case 24: case 26:
1716                 vc->vc_state = ESnormal;
1717                 return;
1718         case 27:
1719                 vc->vc_state = ESesc;
1720                 return;
1721         case 127:
1722                 del(vc);
1723                 return;
1724         case 128+27:
1725                 vc->vc_state = ESsquare;
1726                 return;
1727         }
1728         switch(vc->vc_state) {
1729         case ESesc:
1730                 vc->vc_state = ESnormal;
1731                 switch (c) {
1732                 case '[':
1733                         vc->vc_state = ESsquare;
1734                         return;
1735                 case ']':
1736                         vc->vc_state = ESnonstd;
1737                         return;
1738                 case '%':
1739                         vc->vc_state = ESpercent;
1740                         return;
1741                 case 'E':
1742                         cr(vc);
1743                         lf(vc);
1744                         return;
1745                 case 'M':
1746                         ri(vc);
1747                         return;
1748                 case 'D':
1749                         lf(vc);
1750                         return;
1751                 case 'H':
1752                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1753                         return;
1754                 case 'Z':
1755                         respond_ID(tty);
1756                         return;
1757                 case '7':
1758                         save_cur(vc);
1759                         return;
1760                 case '8':
1761                         restore_cur(vc);
1762                         return;
1763                 case '(':
1764                         vc->vc_state = ESsetG0;
1765                         return;
1766                 case ')':
1767                         vc->vc_state = ESsetG1;
1768                         return;
1769                 case '#':
1770                         vc->vc_state = EShash;
1771                         return;
1772                 case 'c':
1773                         reset_terminal(vc, 1);
1774                         return;
1775                 case '>':  /* Numeric keypad */
1776                         clr_kbd(vc, kbdapplic);
1777                         return;
1778                 case '=':  /* Appl. keypad */
1779                         set_kbd(vc, kbdapplic);
1780                         return;
1781                 }
1782                 return;
1783         case ESnonstd:
1784                 if (c=='P') {   /* palette escape sequence */
1785                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1786                                 vc->vc_par[vc->vc_npar] = 0;
1787                         vc->vc_npar = 0;
1788                         vc->vc_state = ESpalette;
1789                         return;
1790                 } else if (c=='R') {   /* reset palette */
1791                         reset_palette(vc);
1792                         vc->vc_state = ESnormal;
1793                 } else
1794                         vc->vc_state = ESnormal;
1795                 return;
1796         case ESpalette:
1797                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1798                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1799                         if (vc->vc_npar == 7) {
1800                                 int i = vc->vc_par[0] * 3, j = 1;
1801                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1802                                 vc->vc_palette[i++] += vc->vc_par[j++];
1803                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1804                                 vc->vc_palette[i++] += vc->vc_par[j++];
1805                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1806                                 vc->vc_palette[i] += vc->vc_par[j];
1807                                 set_palette(vc);
1808                                 vc->vc_state = ESnormal;
1809                         }
1810                 } else
1811                         vc->vc_state = ESnormal;
1812                 return;
1813         case ESsquare:
1814                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1815                         vc->vc_par[vc->vc_npar] = 0;
1816                 vc->vc_npar = 0;
1817                 vc->vc_state = ESgetpars;
1818                 if (c == '[') { /* Function key */
1819                         vc->vc_state=ESfunckey;
1820                         return;
1821                 }
1822                 vc->vc_ques = (c == '?');
1823                 if (vc->vc_ques)
1824                         return;
1825         case ESgetpars:
1826                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1827                         vc->vc_npar++;
1828                         return;
1829                 } else if (c>='0' && c<='9') {
1830                         vc->vc_par[vc->vc_npar] *= 10;
1831                         vc->vc_par[vc->vc_npar] += c - '0';
1832                         return;
1833                 } else
1834                         vc->vc_state = ESgotpars;
1835         case ESgotpars:
1836                 vc->vc_state = ESnormal;
1837                 switch(c) {
1838                 case 'h':
1839                         set_mode(vc, 1);
1840                         return;
1841                 case 'l':
1842                         set_mode(vc, 0);
1843                         return;
1844                 case 'c':
1845                         if (vc->vc_ques) {
1846                                 if (vc->vc_par[0])
1847                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1848                                 else
1849                                         vc->vc_cursor_type = cur_default;
1850                                 return;
1851                         }
1852                         break;
1853                 case 'm':
1854                         if (vc->vc_ques) {
1855                                 clear_selection();
1856                                 if (vc->vc_par[0])
1857                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1858                                 else
1859                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1860                                 return;
1861                         }
1862                         break;
1863                 case 'n':
1864                         if (!vc->vc_ques) {
1865                                 if (vc->vc_par[0] == 5)
1866                                         status_report(tty);
1867                                 else if (vc->vc_par[0] == 6)
1868                                         cursor_report(vc, tty);
1869                         }
1870                         return;
1871                 }
1872                 if (vc->vc_ques) {
1873                         vc->vc_ques = 0;
1874                         return;
1875                 }
1876                 switch(c) {
1877                 case 'G': case '`':
1878                         if (vc->vc_par[0])
1879                                 vc->vc_par[0]--;
1880                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1881                         return;
1882                 case 'A':
1883                         if (!vc->vc_par[0])
1884                                 vc->vc_par[0]++;
1885                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1886                         return;
1887                 case 'B': case 'e':
1888                         if (!vc->vc_par[0])
1889                                 vc->vc_par[0]++;
1890                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1891                         return;
1892                 case 'C': case 'a':
1893                         if (!vc->vc_par[0])
1894                                 vc->vc_par[0]++;
1895                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1896                         return;
1897                 case 'D':
1898                         if (!vc->vc_par[0])
1899                                 vc->vc_par[0]++;
1900                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1901                         return;
1902                 case 'E':
1903                         if (!vc->vc_par[0])
1904                                 vc->vc_par[0]++;
1905                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1906                         return;
1907                 case 'F':
1908                         if (!vc->vc_par[0])
1909                                 vc->vc_par[0]++;
1910                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1911                         return;
1912                 case 'd':
1913                         if (vc->vc_par[0])
1914                                 vc->vc_par[0]--;
1915                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1916                         return;
1917                 case 'H': case 'f':
1918                         if (vc->vc_par[0])
1919                                 vc->vc_par[0]--;
1920                         if (vc->vc_par[1])
1921                                 vc->vc_par[1]--;
1922                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1923                         return;
1924                 case 'J':
1925                         csi_J(vc, vc->vc_par[0]);
1926                         return;
1927                 case 'K':
1928                         csi_K(vc, vc->vc_par[0]);
1929                         return;
1930                 case 'L':
1931                         csi_L(vc, vc->vc_par[0]);
1932                         return;
1933                 case 'M':
1934                         csi_M(vc, vc->vc_par[0]);
1935                         return;
1936                 case 'P':
1937                         csi_P(vc, vc->vc_par[0]);
1938                         return;
1939                 case 'c':
1940                         if (!vc->vc_par[0])
1941                                 respond_ID(tty);
1942                         return;
1943                 case 'g':
1944                         if (!vc->vc_par[0])
1945                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1946                         else if (vc->vc_par[0] == 3) {
1947                                 vc->vc_tab_stop[0] =
1948                                         vc->vc_tab_stop[1] =
1949                                         vc->vc_tab_stop[2] =
1950                                         vc->vc_tab_stop[3] =
1951                                         vc->vc_tab_stop[4] =
1952                                         vc->vc_tab_stop[5] =
1953                                         vc->vc_tab_stop[6] =
1954                                         vc->vc_tab_stop[7] = 0;
1955                         }
1956                         return;
1957                 case 'm':
1958                         csi_m(vc);
1959                         return;
1960                 case 'q': /* DECLL - but only 3 leds */
1961                         /* map 0,1,2,3 to 0,1,2,4 */
1962                         if (vc->vc_par[0] < 4)
1963                                 setledstate(kbd_table + vc->vc_num,
1964                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1965                         return;
1966                 case 'r':
1967                         if (!vc->vc_par[0])
1968                                 vc->vc_par[0]++;
1969                         if (!vc->vc_par[1])
1970                                 vc->vc_par[1] = vc->vc_rows;
1971                         /* Minimum allowed region is 2 lines */
1972                         if (vc->vc_par[0] < vc->vc_par[1] &&
1973                             vc->vc_par[1] <= vc->vc_rows) {
1974                                 vc->vc_top = vc->vc_par[0] - 1;
1975                                 vc->vc_bottom = vc->vc_par[1];
1976                                 gotoxay(vc, 0, 0);
1977                         }
1978                         return;
1979                 case 's':
1980                         save_cur(vc);
1981                         return;
1982                 case 'u':
1983                         restore_cur(vc);
1984                         return;
1985                 case 'X':
1986                         csi_X(vc, vc->vc_par[0]);
1987                         return;
1988                 case '@':
1989                         csi_at(vc, vc->vc_par[0]);
1990                         return;
1991                 case ']': /* setterm functions */
1992                         setterm_command(vc);
1993                         return;
1994                 }
1995                 return;
1996         case ESpercent:
1997                 vc->vc_state = ESnormal;
1998                 switch (c) {
1999                 case '@':  /* defined in ISO 2022 */
2000                         vc->vc_utf = 0;
2001                         return;
2002                 case 'G':  /* prelim official escape code */
2003                 case '8':  /* retained for compatibility */
2004                         vc->vc_utf = 1;
2005                         return;
2006                 }
2007                 return;
2008         case ESfunckey:
2009                 vc->vc_state = ESnormal;
2010                 return;
2011         case EShash:
2012                 vc->vc_state = ESnormal;
2013                 if (c == '8') {
2014                         /* DEC screen alignment test. kludge :-) */
2015                         vc->vc_video_erase_char =
2016                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2017                         csi_J(vc, 2);
2018                         vc->vc_video_erase_char =
2019                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2020                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2021                 }
2022                 return;
2023         case ESsetG0:
2024                 if (c == '0')
2025                         vc->vc_G0_charset = GRAF_MAP;
2026                 else if (c == 'B')
2027                         vc->vc_G0_charset = LAT1_MAP;
2028                 else if (c == 'U')
2029                         vc->vc_G0_charset = IBMPC_MAP;
2030                 else if (c == 'K')
2031                         vc->vc_G0_charset = USER_MAP;
2032                 if (vc->vc_charset == 0)
2033                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2034                 vc->vc_state = ESnormal;
2035                 return;
2036         case ESsetG1:
2037                 if (c == '0')
2038                         vc->vc_G1_charset = GRAF_MAP;
2039                 else if (c == 'B')
2040                         vc->vc_G1_charset = LAT1_MAP;
2041                 else if (c == 'U')
2042                         vc->vc_G1_charset = IBMPC_MAP;
2043                 else if (c == 'K')
2044                         vc->vc_G1_charset = USER_MAP;
2045                 if (vc->vc_charset == 1)
2046                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2047                 vc->vc_state = ESnormal;
2048                 return;
2049         default:
2050                 vc->vc_state = ESnormal;
2051         }
2052 }
2053
2054 /* This is a temporary buffer used to prepare a tty console write
2055  * so that we can easily avoid touching user space while holding the
2056  * console spinlock.  It is allocated in con_init and is shared by
2057  * this code and the vc_screen read/write tty calls.
2058  *
2059  * We have to allocate this statically in the kernel data section
2060  * since console_init (and thus con_init) are called before any
2061  * kernel memory allocation is available.
2062  */
2063 char con_buf[CON_BUF_SIZE];
2064 DEFINE_MUTEX(con_buf_mtx);
2065
2066 /* is_double_width() is based on the wcwidth() implementation by
2067  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2068  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2069  */
2070 struct interval {
2071         uint32_t first;
2072         uint32_t last;
2073 };
2074
2075 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2076 {
2077         int min = 0;
2078         int mid;
2079
2080         if (ucs < table[0].first || ucs > table[max].last)
2081                 return 0;
2082         while (max >= min) {
2083                 mid = (min + max) / 2;
2084                 if (ucs > table[mid].last)
2085                         min = mid + 1;
2086                 else if (ucs < table[mid].first)
2087                         max = mid - 1;
2088                 else
2089                         return 1;
2090         }
2091         return 0;
2092 }
2093
2094 static int is_double_width(uint32_t ucs)
2095 {
2096         static const struct interval double_width[] = {
2097                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2098                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2099                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2100                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2101         };
2102         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2103 }
2104
2105 /* acquires console_sem */
2106 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2107 {
2108 #ifdef VT_BUF_VRAM_ONLY
2109 #define FLUSH do { } while(0);
2110 #else
2111 #define FLUSH if (draw_x >= 0) { \
2112         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2113         draw_x = -1; \
2114         }
2115 #endif
2116
2117         int c, tc, ok, n = 0, draw_x = -1;
2118         unsigned int currcons;
2119         unsigned long draw_from = 0, draw_to = 0;
2120         struct vc_data *vc;
2121         unsigned char vc_attr;
2122         struct vt_notifier_param param;
2123         uint8_t rescan;
2124         uint8_t inverse;
2125         uint8_t width;
2126         u16 himask, charmask;
2127
2128         if (in_interrupt())
2129                 return count;
2130
2131         might_sleep();
2132
2133         acquire_console_sem();
2134         vc = tty->driver_data;
2135         if (vc == NULL) {
2136                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2137                 release_console_sem();
2138                 return 0;
2139         }
2140
2141         currcons = vc->vc_num;
2142         if (!vc_cons_allocated(currcons)) {
2143             /* could this happen? */
2144                 printk_once("con_write: tty %d not allocated\n", currcons+1);
2145             release_console_sem();
2146             return 0;
2147         }
2148
2149         himask = vc->vc_hi_font_mask;
2150         charmask = himask ? 0x1ff : 0xff;
2151
2152         /* undraw cursor first */
2153         if (IS_FG(vc))
2154                 hide_cursor(vc);
2155
2156         param.vc = vc;
2157
2158         while (!tty->stopped && count) {
2159                 int orig = *buf;
2160                 c = orig;
2161                 buf++;
2162                 n++;
2163                 count--;
2164                 rescan = 0;
2165                 inverse = 0;
2166                 width = 1;
2167
2168                 /* Do no translation at all in control states */
2169                 if (vc->vc_state != ESnormal) {
2170                         tc = c;
2171                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2172                     /* Combine UTF-8 into Unicode in vc_utf_char.
2173                      * vc_utf_count is the number of continuation bytes still
2174                      * expected to arrive.
2175                      * vc_npar is the number of continuation bytes arrived so
2176                      * far
2177                      */
2178 rescan_last_byte:
2179                     if ((c & 0xc0) == 0x80) {
2180                         /* Continuation byte received */
2181                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2182                         if (vc->vc_utf_count) {
2183                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2184                             vc->vc_npar++;
2185                             if (--vc->vc_utf_count) {
2186                                 /* Still need some bytes */
2187                                 continue;
2188                             }
2189                             /* Got a whole character */
2190                             c = vc->vc_utf_char;
2191                             /* Reject overlong sequences */
2192                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2193                                         c > utf8_length_changes[vc->vc_npar])
2194                                 c = 0xfffd;
2195                         } else {
2196                             /* Unexpected continuation byte */
2197                             vc->vc_utf_count = 0;
2198                             c = 0xfffd;
2199                         }
2200                     } else {
2201                         /* Single ASCII byte or first byte of a sequence received */
2202                         if (vc->vc_utf_count) {
2203                             /* Continuation byte expected */
2204                             rescan = 1;
2205                             vc->vc_utf_count = 0;
2206                             c = 0xfffd;
2207                         } else if (c > 0x7f) {
2208                             /* First byte of a multibyte sequence received */
2209                             vc->vc_npar = 0;
2210                             if ((c & 0xe0) == 0xc0) {
2211                                 vc->vc_utf_count = 1;
2212                                 vc->vc_utf_char = (c & 0x1f);
2213                             } else if ((c & 0xf0) == 0xe0) {
2214                                 vc->vc_utf_count = 2;
2215                                 vc->vc_utf_char = (c & 0x0f);
2216                             } else if ((c & 0xf8) == 0xf0) {
2217                                 vc->vc_utf_count = 3;
2218                                 vc->vc_utf_char = (c & 0x07);
2219                             } else if ((c & 0xfc) == 0xf8) {
2220                                 vc->vc_utf_count = 4;
2221                                 vc->vc_utf_char = (c & 0x03);
2222                             } else if ((c & 0xfe) == 0xfc) {
2223                                 vc->vc_utf_count = 5;
2224                                 vc->vc_utf_char = (c & 0x01);
2225                             } else {
2226                                 /* 254 and 255 are invalid */
2227                                 c = 0xfffd;
2228                             }
2229                             if (vc->vc_utf_count) {
2230                                 /* Still need some bytes */
2231                                 continue;
2232                             }
2233                         }
2234                         /* Nothing to do if an ASCII byte was received */
2235                     }
2236                     /* End of UTF-8 decoding. */
2237                     /* c is the received character, or U+FFFD for invalid sequences. */
2238                     /* Replace invalid Unicode code points with U+FFFD too */
2239                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2240                         c = 0xfffd;
2241                     tc = c;
2242                 } else {        /* no utf or alternate charset mode */
2243                     tc = vc_translate(vc, c);
2244                 }
2245
2246                 param.c = tc;
2247                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2248                                         &param) == NOTIFY_STOP)
2249                         continue;
2250
2251                 /* If the original code was a control character we
2252                  * only allow a glyph to be displayed if the code is
2253                  * not normally used (such as for cursor movement) or
2254                  * if the disp_ctrl mode has been explicitly enabled.
2255                  * Certain characters (as given by the CTRL_ALWAYS
2256                  * bitmap) are always displayed as control characters,
2257                  * as the console would be pretty useless without
2258                  * them; to display an arbitrary font position use the
2259                  * direct-to-font zone in UTF-8 mode.
2260                  */
2261                 ok = tc && (c >= 32 ||
2262                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2263                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2264                         && (c != 127 || vc->vc_disp_ctrl)
2265                         && (c != 128+27);
2266
2267                 if (vc->vc_state == ESnormal && ok) {
2268                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2269                                 if (is_double_width(c))
2270                                         width = 2;
2271                         }
2272                         /* Now try to find out how to display it */
2273                         tc = conv_uni_to_pc(vc, tc);
2274                         if (tc & ~charmask) {
2275                                 if (tc == -1 || tc == -2) {
2276                                     continue; /* nothing to display */
2277                                 }
2278                                 /* Glyph not found */
2279                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2280                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2281                                        This would make absolutely no sense with Unicode in mind,
2282                                        but do this for ASCII characters since a font may lack
2283                                        Unicode mapping info and we don't want to end up with
2284                                        having question marks only. */
2285                                     tc = c;
2286                                 } else {
2287                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2288                                     tc = conv_uni_to_pc(vc, 0xfffd);
2289                                     if (tc < 0) {
2290                                         inverse = 1;
2291                                         tc = conv_uni_to_pc(vc, '?');
2292                                         if (tc < 0) tc = '?';
2293                                     }
2294                                 }
2295                         }
2296
2297                         if (!inverse) {
2298                                 vc_attr = vc->vc_attr;
2299                         } else {
2300                                 /* invert vc_attr */
2301                                 if (!vc->vc_can_do_color) {
2302                                         vc_attr = (vc->vc_attr) ^ 0x08;
2303                                 } else if (vc->vc_hi_font_mask == 0x100) {
2304                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2305                                 } else {
2306                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2307                                 }
2308                                 FLUSH
2309                         }
2310
2311                         while (1) {
2312                                 if (vc->vc_need_wrap || vc->vc_decim)
2313                                         FLUSH
2314                                 if (vc->vc_need_wrap) {
2315                                         cr(vc);
2316                                         lf(vc);
2317                                 }
2318                                 if (vc->vc_decim)
2319                                         insert_char(vc, 1);
2320                                 scr_writew(himask ?
2321                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2322                                              (vc_attr << 8) + tc,
2323                                            (u16 *) vc->vc_pos);
2324                                 if (DO_UPDATE(vc) && draw_x < 0) {
2325                                         draw_x = vc->vc_x;
2326                                         draw_from = vc->vc_pos;
2327                                 }
2328                                 if (vc->vc_x == vc->vc_cols - 1) {
2329                                         vc->vc_need_wrap = vc->vc_decawm;
2330                                         draw_to = vc->vc_pos + 2;
2331                                 } else {
2332                                         vc->vc_x++;
2333                                         draw_to = (vc->vc_pos += 2);
2334                                 }
2335
2336                                 if (!--width) break;
2337
2338                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2339                                 if (tc < 0) tc = ' ';
2340                         }
2341                         notify_write(vc, c);
2342
2343                         if (inverse) {
2344                                 FLUSH
2345                         }
2346
2347                         if (rescan) {
2348                                 rescan = 0;
2349                                 inverse = 0;
2350                                 width = 1;
2351                                 c = orig;
2352                                 goto rescan_last_byte;
2353                         }
2354                         continue;
2355                 }
2356                 FLUSH
2357                 do_con_trol(tty, vc, orig);
2358         }
2359         FLUSH
2360         console_conditional_schedule();
2361         release_console_sem();
2362         notify_update(vc);
2363         return n;
2364 #undef FLUSH
2365 }
2366
2367 /*
2368  * This is the console switching callback.
2369  *
2370  * Doing console switching in a process context allows
2371  * us to do the switches asynchronously (needed when we want
2372  * to switch due to a keyboard interrupt).  Synchronization
2373  * with other console code and prevention of re-entrancy is
2374  * ensured with console_sem.
2375  */
2376 static void console_callback(struct work_struct *ignored)
2377 {
2378         acquire_console_sem();
2379
2380         if (want_console >= 0) {
2381                 if (want_console != fg_console &&
2382                     vc_cons_allocated(want_console)) {
2383                         hide_cursor(vc_cons[fg_console].d);
2384                         change_console(vc_cons[want_console].d);
2385                         /* we only changed when the console had already
2386                            been allocated - a new console is not created
2387                            in an interrupt routine */
2388                 }
2389                 want_console = -1;
2390         }
2391         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2392                 do_poke_blanked_console = 0;
2393                 poke_blanked_console();
2394         }
2395         if (scrollback_delta) {
2396                 struct vc_data *vc = vc_cons[fg_console].d;
2397                 clear_selection();
2398                 if (vc->vc_mode == KD_TEXT)
2399                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2400                 scrollback_delta = 0;
2401         }
2402         if (blank_timer_expired) {
2403                 do_blank_screen(0);
2404                 blank_timer_expired = 0;
2405         }
2406         notify_update(vc_cons[fg_console].d);
2407
2408         release_console_sem();
2409 }
2410
2411 int set_console(int nr)
2412 {
2413         struct vc_data *vc = vc_cons[fg_console].d;
2414
2415         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2416                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2417
2418                 /*
2419                  * Console switch will fail in console_callback() or
2420                  * change_console() so there is no point scheduling
2421                  * the callback
2422                  *
2423                  * Existing set_console() users don't check the return
2424                  * value so this shouldn't break anything
2425                  */
2426                 return -EINVAL;
2427         }
2428
2429         want_console = nr;
2430         schedule_console_callback();
2431
2432         return 0;
2433 }
2434
2435 struct tty_driver *console_driver;
2436
2437 #ifdef CONFIG_VT_CONSOLE
2438
2439 /**
2440  * vt_kmsg_redirect() - Sets/gets the kernel message console
2441  * @new:        The new virtual terminal number or -1 if the console should stay
2442  *              unchanged
2443  *
2444  * By default, the kernel messages are always printed on the current virtual
2445  * console. However, the user may modify that default with the
2446  * TIOCL_SETKMSGREDIRECT ioctl call.
2447  *
2448  * This function sets the kernel message console to be @new. It returns the old
2449  * virtual console number. The virtual terminal number 0 (both as parameter and
2450  * return value) means no redirection (i.e. always printed on the currently
2451  * active console).
2452  *
2453  * The parameter -1 means that only the current console is returned, but the
2454  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2455  * case to make the code more understandable.
2456  *
2457  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2458  * the parameter and always returns 0.
2459  */
2460 int vt_kmsg_redirect(int new)
2461 {
2462         static int kmsg_con;
2463
2464         if (new != -1)
2465                 return xchg(&kmsg_con, new);
2466         else
2467                 return kmsg_con;
2468 }
2469
2470 /*
2471  *      Console on virtual terminal
2472  *
2473  * The console must be locked when we get here.
2474  */
2475
2476 static void vt_console_print(struct console *co, const char *b, unsigned count)
2477 {
2478         struct vc_data *vc = vc_cons[fg_console].d;
2479         unsigned char c;
2480         static DEFINE_SPINLOCK(printing_lock);
2481         const ushort *start;
2482         ushort cnt = 0;
2483         ushort myx;
2484         int kmsg_console;
2485
2486         /* console busy or not yet initialized */
2487         if (!printable)
2488                 return;
2489         if (!spin_trylock(&printing_lock))
2490                 return;
2491
2492         kmsg_console = vt_get_kmsg_redirect();
2493         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2494                 vc = vc_cons[kmsg_console - 1].d;
2495
2496         /* read `x' only after setting currcons properly (otherwise
2497            the `x' macro will read the x of the foreground console). */
2498         myx = vc->vc_x;
2499
2500         if (!vc_cons_allocated(fg_console)) {
2501                 /* impossible */
2502                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2503                 goto quit;
2504         }
2505
2506         if (vc->vc_mode != KD_TEXT)
2507                 goto quit;
2508
2509         /* undraw cursor first */
2510         if (IS_FG(vc))
2511                 hide_cursor(vc);
2512
2513         start = (ushort *)vc->vc_pos;
2514
2515         /* Contrived structure to try to emulate original need_wrap behaviour
2516          * Problems caused when we have need_wrap set on '\n' character */
2517         while (count--) {
2518                 c = *b++;
2519                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2520                         if (cnt > 0) {
2521                                 if (CON_IS_VISIBLE(vc))
2522                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2523                                 vc->vc_x += cnt;
2524                                 if (vc->vc_need_wrap)
2525                                         vc->vc_x--;
2526                                 cnt = 0;
2527                         }
2528                         if (c == 8) {           /* backspace */
2529                                 bs(vc);
2530                                 start = (ushort *)vc->vc_pos;
2531                                 myx = vc->vc_x;
2532                                 continue;
2533                         }
2534                         if (c != 13)
2535                                 lf(vc);
2536                         cr(vc);
2537                         start = (ushort *)vc->vc_pos;
2538                         myx = vc->vc_x;
2539                         if (c == 10 || c == 13)
2540                                 continue;
2541                 }
2542                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2543                 notify_write(vc, c);
2544                 cnt++;
2545                 if (myx == vc->vc_cols - 1) {
2546                         vc->vc_need_wrap = 1;
2547                         continue;
2548                 }
2549                 vc->vc_pos += 2;
2550                 myx++;
2551         }
2552         if (cnt > 0) {
2553                 if (CON_IS_VISIBLE(vc))
2554                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2555                 vc->vc_x += cnt;
2556                 if (vc->vc_x == vc->vc_cols) {
2557                         vc->vc_x--;
2558                         vc->vc_need_wrap = 1;
2559                 }
2560         }
2561         set_cursor(vc);
2562         notify_update(vc);
2563
2564 quit:
2565         spin_unlock(&printing_lock);
2566 }
2567
2568 static struct tty_driver *vt_console_device(struct console *c, int *index)
2569 {
2570         *index = c->index ? c->index-1 : fg_console;
2571         return console_driver;
2572 }
2573
2574 static struct console vt_console_driver = {
2575         .name           = "tty",
2576         .write          = vt_console_print,
2577         .device         = vt_console_device,
2578         .unblank        = unblank_screen,
2579         .flags          = CON_PRINTBUFFER,
2580         .index          = -1,
2581 };
2582 #endif
2583
2584 /*
2585  *      Handling of Linux-specific VC ioctls
2586  */
2587
2588 /*
2589  * Generally a bit racy with respect to console_sem().
2590  *
2591  * There are some functions which don't need it.
2592  *
2593  * There are some functions which can sleep for arbitrary periods
2594  * (paste_selection) but we don't need the lock there anyway.
2595  *
2596  * set_selection has locking, and definitely needs it
2597  */
2598
2599 int tioclinux(struct tty_struct *tty, unsigned long arg)
2600 {
2601         char type, data;
2602         char __user *p = (char __user *)arg;
2603         int lines;
2604         int ret;
2605
2606         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2607                 return -EPERM;
2608         if (get_user(type, p))
2609                 return -EFAULT;
2610         ret = 0;
2611
2612         lock_kernel();
2613
2614         switch (type)
2615         {
2616                 case TIOCL_SETSEL:
2617                         acquire_console_sem();
2618                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2619                         release_console_sem();
2620                         break;
2621                 case TIOCL_PASTESEL:
2622                         ret = paste_selection(tty);
2623                         break;
2624                 case TIOCL_UNBLANKSCREEN:
2625                         acquire_console_sem();
2626                         unblank_screen();
2627                         release_console_sem();
2628                         break;
2629                 case TIOCL_SELLOADLUT:
2630                         ret = sel_loadlut(p);
2631                         break;
2632                 case TIOCL_GETSHIFTSTATE:
2633
2634         /*
2635          * Make it possible to react to Shift+Mousebutton.
2636          * Note that 'shift_state' is an undocumented
2637          * kernel-internal variable; programs not closely
2638          * related to the kernel should not use this.
2639          */
2640                         data = shift_state;
2641                         ret = __put_user(data, p);
2642                         break;
2643                 case TIOCL_GETMOUSEREPORTING:
2644                         data = mouse_reporting();
2645                         ret = __put_user(data, p);
2646                         break;
2647                 case TIOCL_SETVESABLANK:
2648                         ret = set_vesa_blanking(p);
2649                         break;
2650                 case TIOCL_GETKMSGREDIRECT:
2651                         data = vt_get_kmsg_redirect();
2652                         ret = __put_user(data, p);
2653                         break;
2654                 case TIOCL_SETKMSGREDIRECT:
2655                         if (!capable(CAP_SYS_ADMIN)) {
2656                                 ret = -EPERM;
2657                         } else {
2658                                 if (get_user(data, p+1))
2659                                         ret = -EFAULT;
2660                                 else
2661                                         vt_kmsg_redirect(data);
2662                         }
2663                         break;
2664                 case TIOCL_GETFGCONSOLE:
2665                         ret = fg_console;
2666                         break;
2667                 case TIOCL_SCROLLCONSOLE:
2668                         if (get_user(lines, (s32 __user *)(p+4))) {
2669                                 ret = -EFAULT;
2670                         } else {
2671                                 scrollfront(vc_cons[fg_console].d, lines);
2672                                 ret = 0;
2673                         }
2674                         break;
2675                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2676                         acquire_console_sem();
2677                         ignore_poke = 1;
2678                         do_blank_screen(0);
2679                         release_console_sem();
2680                         break;
2681                 case TIOCL_BLANKEDSCREEN:
2682                         ret = console_blanked;
2683                         break;
2684                 default:
2685                         ret = -EINVAL;
2686                         break;
2687         }
2688         unlock_kernel();
2689         return ret;
2690 }
2691
2692 /*
2693  * /dev/ttyN handling
2694  */
2695
2696 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2697 {
2698         int     retval;
2699
2700         retval = do_con_write(tty, buf, count);
2701         con_flush_chars(tty);
2702
2703         return retval;
2704 }
2705
2706 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2707 {
2708         if (in_interrupt())
2709                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2710         return do_con_write(tty, &ch, 1);
2711 }
2712
2713 static int con_write_room(struct tty_struct *tty)
2714 {
2715         if (tty->stopped)
2716                 return 0;
2717         return 32768;           /* No limit, really; we're not buffering */
2718 }
2719
2720 static int con_chars_in_buffer(struct tty_struct *tty)
2721 {
2722         return 0;               /* we're not buffering */
2723 }
2724
2725 /*
2726  * con_throttle and con_unthrottle are only used for
2727  * paste_selection(), which has to stuff in a large number of
2728  * characters...
2729  */
2730 static void con_throttle(struct tty_struct *tty)
2731 {
2732 }
2733
2734 static void con_unthrottle(struct tty_struct *tty)
2735 {
2736         struct vc_data *vc = tty->driver_data;
2737
2738         wake_up_interruptible(&vc->paste_wait);
2739 }
2740
2741 /*
2742  * Turn the Scroll-Lock LED on when the tty is stopped
2743  */
2744 static void con_stop(struct tty_struct *tty)
2745 {
2746         int console_num;
2747         if (!tty)
2748                 return;
2749         console_num = tty->index;
2750         if (!vc_cons_allocated(console_num))
2751                 return;
2752         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2753         set_leds();
2754 }
2755
2756 /*
2757  * Turn the Scroll-Lock LED off when the console is started
2758  */
2759 static void con_start(struct tty_struct *tty)
2760 {
2761         int console_num;
2762         if (!tty)
2763                 return;
2764         console_num = tty->index;
2765         if (!vc_cons_allocated(console_num))
2766                 return;
2767         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2768         set_leds();
2769 }
2770
2771 static void con_flush_chars(struct tty_struct *tty)
2772 {
2773         struct vc_data *vc;
2774
2775         if (in_interrupt())     /* from flush_to_ldisc */
2776                 return;
2777
2778         /* if we race with con_close(), vt may be null */
2779         acquire_console_sem();
2780         vc = tty->driver_data;
2781         if (vc)
2782                 set_cursor(vc);
2783         release_console_sem();
2784 }
2785
2786 /*
2787  * Allocate the console screen memory.
2788  */
2789 static int con_open(struct tty_struct *tty, struct file *filp)
2790 {
2791         unsigned int currcons = tty->index;
2792         int ret = 0;
2793
2794         acquire_console_sem();
2795         if (tty->driver_data == NULL) {
2796                 ret = vc_allocate(currcons);
2797                 if (ret == 0) {
2798                         struct vc_data *vc = vc_cons[currcons].d;
2799
2800                         /* Still being freed */
2801                         if (vc->vc_tty) {
2802                                 release_console_sem();
2803                                 return -ERESTARTSYS;
2804                         }
2805                         tty->driver_data = vc;
2806                         vc->vc_tty = tty;
2807
2808                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2809                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2810                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2811                         }
2812                         if (vc->vc_utf)
2813                                 tty->termios->c_iflag |= IUTF8;
2814                         else
2815                                 tty->termios->c_iflag &= ~IUTF8;
2816                         release_console_sem();
2817                         return ret;
2818                 }
2819         }
2820         release_console_sem();
2821         return ret;
2822 }
2823
2824 static void con_close(struct tty_struct *tty, struct file *filp)
2825 {
2826         /* Nothing to do - we defer to shutdown */
2827 }
2828
2829 static void con_shutdown(struct tty_struct *tty)
2830 {
2831         struct vc_data *vc = tty->driver_data;
2832         BUG_ON(vc == NULL);
2833         acquire_console_sem();
2834         vc->vc_tty = NULL;
2835         release_console_sem();
2836         tty_shutdown(tty);
2837 }
2838
2839 static int default_italic_color    = 2; // green (ASCII)
2840 static int default_underline_color = 3; // cyan (ASCII)
2841 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2842 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2843
2844 static void vc_init(struct vc_data *vc, unsigned int rows,
2845                     unsigned int cols, int do_clear)
2846 {
2847         int j, k ;
2848
2849         vc->vc_cols = cols;
2850         vc->vc_rows = rows;
2851         vc->vc_size_row = cols << 1;
2852         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2853
2854         set_origin(vc);
2855         vc->vc_pos = vc->vc_origin;
2856         reset_vc(vc);
2857         for (j=k=0; j<16; j++) {
2858                 vc->vc_palette[k++] = default_red[j] ;
2859                 vc->vc_palette[k++] = default_grn[j] ;
2860                 vc->vc_palette[k++] = default_blu[j] ;
2861         }
2862         vc->vc_def_color       = 0x07;   /* white */
2863         vc->vc_ulcolor         = default_underline_color;
2864         vc->vc_itcolor         = default_italic_color;
2865         vc->vc_halfcolor       = 0x08;   /* grey */
2866         init_waitqueue_head(&vc->paste_wait);
2867         reset_terminal(vc, do_clear);
2868 }
2869
2870 /*
2871  * This routine initializes console interrupts, and does nothing
2872  * else. If you want the screen to clear, call tty_write with
2873  * the appropriate escape-sequence.
2874  */
2875
2876 static int __init con_init(void)
2877 {
2878         const char *display_desc = NULL;
2879         struct vc_data *vc;
2880         unsigned int currcons = 0, i;
2881
2882         acquire_console_sem();
2883
2884         if (conswitchp)
2885                 display_desc = conswitchp->con_startup();
2886         if (!display_desc) {
2887                 fg_console = 0;
2888                 release_console_sem();
2889                 return 0;
2890         }
2891
2892         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2893                 struct con_driver *con_driver = &registered_con_driver[i];
2894
2895                 if (con_driver->con == NULL) {
2896                         con_driver->con = conswitchp;
2897                         con_driver->desc = display_desc;
2898                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2899                         con_driver->first = 0;
2900                         con_driver->last = MAX_NR_CONSOLES - 1;
2901                         break;
2902                 }
2903         }
2904
2905         for (i = 0; i < MAX_NR_CONSOLES; i++)
2906                 con_driver_map[i] = conswitchp;
2907
2908         if (blankinterval) {
2909                 blank_state = blank_normal_wait;
2910                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2911         }
2912
2913         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2914                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2915                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2916                 visual_init(vc, currcons, 1);
2917                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2918                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2919                         currcons || !vc->vc_sw->con_save_screen);
2920         }
2921         currcons = fg_console = 0;
2922         master_display_fg = vc = vc_cons[currcons].d;
2923         set_origin(vc);
2924         save_screen(vc);
2925         gotoxy(vc, vc->vc_x, vc->vc_y);
2926         csi_J(vc, 0);
2927         update_screen(vc);
2928         printk("Console: %s %s %dx%d",
2929                 vc->vc_can_do_color ? "colour" : "mono",
2930                 display_desc, vc->vc_cols, vc->vc_rows);
2931         printable = 1;
2932         printk("\n");
2933
2934         release_console_sem();
2935
2936 #ifdef CONFIG_VT_CONSOLE
2937         register_console(&vt_console_driver);
2938 #endif
2939         return 0;
2940 }
2941 console_initcall(con_init);
2942
2943 static const struct tty_operations con_ops = {
2944         .open = con_open,
2945         .close = con_close,
2946         .write = con_write,
2947         .write_room = con_write_room,
2948         .put_char = con_put_char,
2949         .flush_chars = con_flush_chars,
2950         .chars_in_buffer = con_chars_in_buffer,
2951         .ioctl = vt_ioctl,
2952 #ifdef CONFIG_COMPAT
2953         .compat_ioctl = vt_compat_ioctl,
2954 #endif
2955         .stop = con_stop,
2956         .start = con_start,
2957         .throttle = con_throttle,
2958         .unthrottle = con_unthrottle,
2959         .resize = vt_resize,
2960         .shutdown = con_shutdown
2961 };
2962
2963 static struct cdev vc0_cdev;
2964
2965 int __init vty_init(const struct file_operations *console_fops)
2966 {
2967         cdev_init(&vc0_cdev, console_fops);
2968         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2969             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2970                 panic("Couldn't register /dev/tty0 driver\n");
2971         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2972
2973         vcs_init();
2974
2975         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2976         if (!console_driver)
2977                 panic("Couldn't allocate console driver\n");
2978         console_driver->owner = THIS_MODULE;
2979         console_driver->name = "tty";
2980         console_driver->name_base = 1;
2981         console_driver->major = TTY_MAJOR;
2982         console_driver->minor_start = 1;
2983         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2984         console_driver->init_termios = tty_std_termios;
2985         if (default_utf8)
2986                 console_driver->init_termios.c_iflag |= IUTF8;
2987         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2988         tty_set_operations(console_driver, &con_ops);
2989         if (tty_register_driver(console_driver))
2990                 panic("Couldn't register console driver\n");
2991         kbd_init();
2992         console_map_init();
2993 #ifdef CONFIG_MDA_CONSOLE
2994         mda_console_init();
2995 #endif
2996         return 0;
2997 }
2998
2999 #ifndef VT_SINGLE_DRIVER
3000
3001 static struct class *vtconsole_class;
3002
3003 static int bind_con_driver(const struct consw *csw, int first, int last,
3004                            int deflt)
3005 {
3006         struct module *owner = csw->owner;
3007         const char *desc = NULL;
3008         struct con_driver *con_driver;
3009         int i, j = -1, k = -1, retval = -ENODEV;
3010
3011         if (!try_module_get(owner))
3012                 return -ENODEV;
3013
3014         acquire_console_sem();
3015
3016         /* check if driver is registered */
3017         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3018                 con_driver = &registered_con_driver[i];
3019
3020                 if (con_driver->con == csw) {
3021                         desc = con_driver->desc;
3022                         retval = 0;
3023                         break;
3024                 }
3025         }
3026
3027         if (retval)
3028                 goto err;
3029
3030         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3031                 csw->con_startup();
3032                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3033         }
3034
3035         if (deflt) {
3036                 if (conswitchp)
3037                         module_put(conswitchp->owner);
3038
3039                 __module_get(owner);
3040                 conswitchp = csw;
3041         }
3042
3043         first = max(first, con_driver->first);
3044         last = min(last, con_driver->last);
3045
3046         for (i = first; i <= last; i++) {
3047                 int old_was_color;
3048                 struct vc_data *vc = vc_cons[i].d;
3049
3050                 if (con_driver_map[i])
3051                         module_put(con_driver_map[i]->owner);
3052                 __module_get(owner);
3053                 con_driver_map[i] = csw;
3054
3055                 if (!vc || !vc->vc_sw)
3056                         continue;
3057
3058                 j = i;
3059
3060                 if (CON_IS_VISIBLE(vc)) {
3061                         k = i;
3062                         save_screen(vc);
3063                 }
3064
3065                 old_was_color = vc->vc_can_do_color;
3066                 vc->vc_sw->con_deinit(vc);
3067                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3068                 visual_init(vc, i, 0);
3069                 set_origin(vc);
3070                 update_attr(vc);
3071
3072                 /* If the console changed between mono <-> color, then
3073                  * the attributes in the screenbuf will be wrong.  The
3074                  * following resets all attributes to something sane.
3075                  */
3076                 if (old_was_color != vc->vc_can_do_color)
3077                         clear_buffer_attributes(vc);
3078         }
3079
3080         printk("Console: switching ");
3081         if (!deflt)
3082                 printk("consoles %d-%d ", first+1, last+1);
3083         if (j >= 0) {
3084                 struct vc_data *vc = vc_cons[j].d;
3085
3086                 printk("to %s %s %dx%d\n",
3087                        vc->vc_can_do_color ? "colour" : "mono",
3088                        desc, vc->vc_cols, vc->vc_rows);
3089
3090                 if (k >= 0) {
3091                         vc = vc_cons[k].d;
3092                         update_screen(vc);
3093                 }
3094         } else
3095                 printk("to %s\n", desc);
3096
3097         retval = 0;
3098 err:
3099         release_console_sem();
3100         module_put(owner);
3101         return retval;
3102 };
3103
3104 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3105 static int con_is_graphics(const struct consw *csw, int first, int last)
3106 {
3107         int i, retval = 0;
3108
3109         for (i = first; i <= last; i++) {
3110                 struct vc_data *vc = vc_cons[i].d;
3111
3112                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3113                         retval = 1;
3114                         break;
3115                 }
3116         }
3117
3118         return retval;
3119 }
3120
3121 /**
3122  * unbind_con_driver - unbind a console driver
3123  * @csw: pointer to console driver to unregister
3124  * @first: first in range of consoles that @csw should be unbound from
3125  * @last: last in range of consoles that @csw should be unbound from
3126  * @deflt: should next bound console driver be default after @csw is unbound?
3127  *
3128  * To unbind a driver from all possible consoles, pass 0 as @first and
3129  * %MAX_NR_CONSOLES as @last.
3130  *
3131  * @deflt controls whether the console that ends up replacing @csw should be
3132  * the default console.
3133  *
3134  * RETURNS:
3135  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3136  * or 0 on success.
3137  */
3138 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3139 {
3140         struct module *owner = csw->owner;
3141         const struct consw *defcsw = NULL;
3142         struct con_driver *con_driver = NULL, *con_back = NULL;
3143         int i, retval = -ENODEV;
3144
3145         if (!try_module_get(owner))
3146                 return -ENODEV;
3147
3148         acquire_console_sem();
3149
3150         /* check if driver is registered and if it is unbindable */
3151         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3152                 con_driver = &registered_con_driver[i];
3153
3154                 if (con_driver->con == csw &&
3155                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3156                         retval = 0;
3157                         break;
3158                 }
3159         }
3160
3161         if (retval) {
3162                 release_console_sem();
3163                 goto err;
3164         }
3165
3166         retval = -ENODEV;
3167
3168         /* check if backup driver exists */
3169         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3170                 con_back = &registered_con_driver[i];
3171
3172                 if (con_back->con &&
3173                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3174                         defcsw = con_back->con;
3175                         retval = 0;
3176                         break;
3177                 }
3178         }
3179
3180         if (retval) {
3181                 release_console_sem();
3182                 goto err;
3183         }
3184
3185         if (!con_is_bound(csw)) {
3186                 release_console_sem();
3187                 goto err;
3188         }
3189
3190         first = max(first, con_driver->first);
3191         last = min(last, con_driver->last);
3192
3193         for (i = first; i <= last; i++) {
3194                 if (con_driver_map[i] == csw) {
3195                         module_put(csw->owner);
3196                         con_driver_map[i] = NULL;
3197                 }
3198         }
3199
3200         if (!con_is_bound(defcsw)) {
3201                 const struct consw *defconsw = conswitchp;
3202
3203                 defcsw->con_startup();
3204                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3205                 /*
3206                  * vgacon may change the default driver to point
3207                  * to dummycon, we restore it here...
3208                  */
3209                 conswitchp = defconsw;
3210         }
3211
3212         if (!con_is_bound(csw))
3213                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3214
3215         release_console_sem();
3216         /* ignore return value, binding should not fail */
3217         bind_con_driver(defcsw, first, last, deflt);
3218 err:
3219         module_put(owner);
3220         return retval;
3221
3222 }
3223 EXPORT_SYMBOL(unbind_con_driver);
3224
3225 static int vt_bind(struct con_driver *con)
3226 {
3227         const struct consw *defcsw = NULL, *csw = NULL;
3228         int i, more = 1, first = -1, last = -1, deflt = 0;
3229
3230         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3231             con_is_graphics(con->con, con->first, con->last))
3232                 goto err;
3233
3234         csw = con->con;
3235
3236         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3237                 struct con_driver *con = &registered_con_driver[i];
3238
3239                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3240                         defcsw = con->con;
3241                         break;
3242                 }
3243         }
3244
3245         if (!defcsw)
3246                 goto err;
3247
3248         while (more) {
3249                 more = 0;
3250
3251                 for (i = con->first; i <= con->last; i++) {
3252                         if (con_driver_map[i] == defcsw) {
3253                                 if (first == -1)
3254                                         first = i;
3255                                 last = i;
3256                                 more = 1;
3257                         } else if (first != -1)
3258                                 break;
3259                 }
3260
3261                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3262                         deflt = 1;
3263
3264                 if (first != -1)
3265                         bind_con_driver(csw, first, last, deflt);
3266
3267                 first = -1;
3268                 last = -1;
3269                 deflt = 0;
3270         }
3271
3272 err:
3273         return 0;
3274 }
3275
3276 static int vt_unbind(struct con_driver *con)
3277 {
3278         const struct consw *csw = NULL;
3279         int i, more = 1, first = -1, last = -1, deflt = 0;
3280
3281         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3282             con_is_graphics(con->con, con->first, con->last))
3283                 goto err;
3284
3285         csw = con->con;
3286
3287         while (more) {
3288                 more = 0;
3289
3290                 for (i = con->first; i <= con->last; i++) {
3291                         if (con_driver_map[i] == csw) {
3292                                 if (first == -1)
3293                                         first = i;
3294                                 last = i;
3295                                 more = 1;
3296                         } else if (first != -1)
3297                                 break;
3298                 }
3299
3300                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3301                         deflt = 1;
3302
3303                 if (first != -1)
3304                         unbind_con_driver(csw, first, last, deflt);
3305
3306                 first = -1;
3307                 last = -1;
3308                 deflt = 0;
3309         }
3310
3311 err:
3312         return 0;
3313 }
3314 #else
3315 static inline int vt_bind(struct con_driver *con)
3316 {
3317         return 0;
3318 }
3319 static inline int vt_unbind(struct con_driver *con)
3320 {
3321         return 0;
3322 }
3323 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3324
3325 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3326                           const char *buf, size_t count)
3327 {
3328         struct con_driver *con = dev_get_drvdata(dev);
3329         int bind = simple_strtoul(buf, NULL, 0);
3330
3331         if (bind)
3332                 vt_bind(con);
3333         else
3334                 vt_unbind(con);
3335
3336         return count;
3337 }
3338
3339 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3340                          char *buf)
3341 {
3342         struct con_driver *con = dev_get_drvdata(dev);
3343         int bind = con_is_bound(con->con);
3344
3345         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3346 }
3347
3348 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3349                          char *buf)
3350 {
3351         struct con_driver *con = dev_get_drvdata(dev);
3352
3353         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3354                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3355                          con->desc);
3356
3357 }
3358
3359 static struct device_attribute device_attrs[] = {
3360         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3361         __ATTR(name, S_IRUGO, show_name, NULL),
3362 };
3363
3364 static int vtconsole_init_device(struct con_driver *con)
3365 {
3366         int i;
3367         int error = 0;
3368
3369         con->flag |= CON_DRIVER_FLAG_ATTR;
3370         dev_set_drvdata(con->dev, con);
3371         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3372                 error = device_create_file(con->dev, &device_attrs[i]);
3373                 if (error)
3374                         break;
3375         }
3376
3377         if (error) {
3378                 while (--i >= 0)
3379                         device_remove_file(con->dev, &device_attrs[i]);
3380                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3381         }
3382
3383         return error;
3384 }
3385
3386 static void vtconsole_deinit_device(struct con_driver *con)
3387 {
3388         int i;
3389
3390         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3391                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3392                         device_remove_file(con->dev, &device_attrs[i]);
3393                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3394         }
3395 }
3396
3397 /**
3398  * con_is_bound - checks if driver is bound to the console
3399  * @csw: console driver
3400  *
3401  * RETURNS: zero if unbound, nonzero if bound
3402  *
3403  * Drivers can call this and if zero, they should release
3404  * all resources allocated on con_startup()
3405  */
3406 int con_is_bound(const struct consw *csw)
3407 {
3408         int i, bound = 0;
3409
3410         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3411                 if (con_driver_map[i] == csw) {
3412                         bound = 1;
3413                         break;
3414                 }
3415         }
3416
3417         return bound;
3418 }
3419 EXPORT_SYMBOL(con_is_bound);
3420
3421 /**
3422  * con_debug_enter - prepare the console for the kernel debugger
3423  * @sw: console driver
3424  *
3425  * Called when the console is taken over by the kernel debugger, this
3426  * function needs to save the current console state, then put the console
3427  * into a state suitable for the kernel debugger.
3428  *
3429  * RETURNS:
3430  * Zero on success, nonzero if a failure occurred when trying to prepare
3431  * the console for the debugger.
3432  */
3433 int con_debug_enter(struct vc_data *vc)
3434 {
3435         int ret = 0;
3436
3437         saved_fg_console = fg_console;
3438         saved_last_console = last_console;
3439         saved_want_console = want_console;
3440         saved_vc_mode = vc->vc_mode;
3441         vc->vc_mode = KD_TEXT;
3442         console_blanked = 0;
3443         if (vc->vc_sw->con_debug_enter)
3444                 ret = vc->vc_sw->con_debug_enter(vc);
3445         return ret;
3446 }
3447 EXPORT_SYMBOL_GPL(con_debug_enter);
3448
3449 /**
3450  * con_debug_leave - restore console state
3451  * @sw: console driver
3452  *
3453  * Restore the console state to what it was before the kernel debugger
3454  * was invoked.
3455  *
3456  * RETURNS:
3457  * Zero on success, nonzero if a failure occurred when trying to restore
3458  * the console.
3459  */
3460 int con_debug_leave(void)
3461 {
3462         struct vc_data *vc;
3463         int ret = 0;
3464
3465         fg_console = saved_fg_console;
3466         last_console = saved_last_console;
3467         want_console = saved_want_console;
3468         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3469
3470         vc = vc_cons[fg_console].d;
3471         if (vc->vc_sw->con_debug_leave)
3472                 ret = vc->vc_sw->con_debug_leave(vc);
3473         return ret;
3474 }
3475 EXPORT_SYMBOL_GPL(con_debug_leave);
3476
3477 /**
3478  * register_con_driver - register console driver to console layer
3479  * @csw: console driver
3480  * @first: the first console to take over, minimum value is 0
3481  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3482  *
3483  * DESCRIPTION: This function registers a console driver which can later
3484  * bind to a range of consoles specified by @first and @last. It will
3485  * also initialize the console driver by calling con_startup().
3486  */
3487 int register_con_driver(const struct consw *csw, int first, int last)
3488 {
3489         struct module *owner = csw->owner;
3490         struct con_driver *con_driver;
3491         const char *desc;
3492         int i, retval = 0;
3493
3494         if (!try_module_get(owner))
3495                 return -ENODEV;
3496
3497         acquire_console_sem();
3498
3499         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3500                 con_driver = &registered_con_driver[i];
3501
3502                 /* already registered */
3503                 if (con_driver->con == csw)
3504                         retval = -EINVAL;
3505         }
3506
3507         if (retval)
3508                 goto err;
3509
3510         desc = csw->con_startup();
3511
3512         if (!desc)
3513                 goto err;
3514
3515         retval = -EINVAL;
3516
3517         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3518                 con_driver = &registered_con_driver[i];
3519
3520                 if (con_driver->con == NULL) {
3521                         con_driver->con = csw;
3522                         con_driver->desc = desc;
3523                         con_driver->node = i;
3524                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3525                                            CON_DRIVER_FLAG_INIT;
3526                         con_driver->first = first;
3527                         con_driver->last = last;
3528                         retval = 0;
3529                         break;
3530                 }
3531         }
3532
3533         if (retval)
3534                 goto err;
3535
3536         con_driver->dev = device_create(vtconsole_class, NULL,
3537                                                 MKDEV(0, con_driver->node),
3538                                                 NULL, "vtcon%i",
3539                                                 con_driver->node);
3540
3541         if (IS_ERR(con_driver->dev)) {
3542                 printk(KERN_WARNING "Unable to create device for %s; "
3543                        "errno = %ld\n", con_driver->desc,
3544                        PTR_ERR(con_driver->dev));
3545                 con_driver->dev = NULL;
3546         } else {
3547                 vtconsole_init_device(con_driver);
3548         }
3549
3550 err:
3551         release_console_sem();
3552         module_put(owner);
3553         return retval;
3554 }
3555 EXPORT_SYMBOL(register_con_driver);
3556
3557 /**
3558  * unregister_con_driver - unregister console driver from console layer
3559  * @csw: console driver
3560  *
3561  * DESCRIPTION: All drivers that registers to the console layer must
3562  * call this function upon exit, or if the console driver is in a state
3563  * where it won't be able to handle console services, such as the
3564  * framebuffer console without loaded framebuffer drivers.
3565  *
3566  * The driver must unbind first prior to unregistration.
3567  */
3568 int unregister_con_driver(const struct consw *csw)
3569 {
3570         int i, retval = -ENODEV;
3571
3572         acquire_console_sem();
3573
3574         /* cannot unregister a bound driver */
3575         if (con_is_bound(csw))
3576                 goto err;
3577
3578         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3579                 struct con_driver *con_driver = &registered_con_driver[i];
3580
3581                 if (con_driver->con == csw &&
3582                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3583                         vtconsole_deinit_device(con_driver);
3584                         device_destroy(vtconsole_class,
3585                                        MKDEV(0, con_driver->node));
3586                         con_driver->con = NULL;
3587                         con_driver->desc = NULL;
3588                         con_driver->dev = NULL;
3589                         con_driver->node = 0;
3590                         con_driver->flag = 0;
3591                         con_driver->first = 0;
3592                         con_driver->last = 0;
3593                         retval = 0;
3594                         break;
3595                 }
3596         }
3597 err:
3598         release_console_sem();
3599         return retval;
3600 }
3601 EXPORT_SYMBOL(unregister_con_driver);
3602
3603 /*
3604  *      If we support more console drivers, this function is used
3605  *      when a driver wants to take over some existing consoles
3606  *      and become default driver for newly opened ones.
3607  *
3608  *      take_over_console is basically a register followed by unbind
3609  */
3610 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3611 {
3612         int err;
3613
3614         err = register_con_driver(csw, first, last);
3615
3616         if (!err)
3617                 bind_con_driver(csw, first, last, deflt);
3618
3619         return err;
3620 }
3621
3622 /*
3623  * give_up_console is a wrapper to unregister_con_driver. It will only
3624  * work if driver is fully unbound.
3625  */
3626 void give_up_console(const struct consw *csw)
3627 {
3628         unregister_con_driver(csw);
3629 }
3630
3631 static int __init vtconsole_class_init(void)
3632 {
3633         int i;
3634
3635         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3636         if (IS_ERR(vtconsole_class)) {
3637                 printk(KERN_WARNING "Unable to create vt console class; "
3638                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3639                 vtconsole_class = NULL;
3640         }
3641
3642         /* Add system drivers to sysfs */
3643         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3644                 struct con_driver *con = &registered_con_driver[i];
3645
3646                 if (con->con && !con->dev) {
3647                         con->dev = device_create(vtconsole_class, NULL,
3648                                                          MKDEV(0, con->node),
3649                                                          NULL, "vtcon%i",
3650                                                          con->node);
3651
3652                         if (IS_ERR(con->dev)) {
3653                                 printk(KERN_WARNING "Unable to create "
3654                                        "device for %s; errno = %ld\n",
3655                                        con->desc, PTR_ERR(con->dev));
3656                                 con->dev = NULL;
3657                         } else {
3658                                 vtconsole_init_device(con);
3659                         }
3660                 }
3661         }
3662
3663         return 0;
3664 }
3665 postcore_initcall(vtconsole_class_init);
3666
3667 #endif
3668
3669 /*
3670  *      Screen blanking
3671  */
3672
3673 static int set_vesa_blanking(char __user *p)
3674 {
3675         unsigned int mode;
3676
3677         if (get_user(mode, p + 1))
3678                 return -EFAULT;
3679
3680         vesa_blank_mode = (mode < 4) ? mode : 0;
3681         return 0;
3682 }
3683
3684 void do_blank_screen(int entering_gfx)
3685 {
3686         struct vc_data *vc = vc_cons[fg_console].d;
3687         int i;
3688
3689         WARN_CONSOLE_UNLOCKED();
3690
3691         if (console_blanked) {
3692                 if (blank_state == blank_vesa_wait) {
3693                         blank_state = blank_off;
3694                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3695                 }
3696                 return;
3697         }
3698
3699         /* entering graphics mode? */
3700         if (entering_gfx) {
3701                 hide_cursor(vc);
3702                 save_screen(vc);
3703                 vc->vc_sw->con_blank(vc, -1, 1);
3704                 console_blanked = fg_console + 1;
3705                 blank_state = blank_off;
3706                 set_origin(vc);
3707                 return;
3708         }
3709
3710         if (blank_state != blank_normal_wait)
3711                 return;
3712         blank_state = blank_off;
3713
3714         /* don't blank graphics */
3715         if (vc->vc_mode != KD_TEXT) {
3716                 console_blanked = fg_console + 1;
3717                 return;
3718         }
3719
3720         hide_cursor(vc);
3721         del_timer_sync(&console_timer);
3722         blank_timer_expired = 0;
3723
3724         save_screen(vc);
3725         /* In case we need to reset origin, blanking hook returns 1 */
3726         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3727         console_blanked = fg_console + 1;
3728         if (i)
3729                 set_origin(vc);
3730
3731         if (console_blank_hook && console_blank_hook(1))
3732                 return;
3733
3734         if (vesa_off_interval && vesa_blank_mode) {
3735                 blank_state = blank_vesa_wait;
3736                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3737         }
3738         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3739 }
3740 EXPORT_SYMBOL(do_blank_screen);
3741
3742 /*
3743  * Called by timer as well as from vt_console_driver
3744  */
3745 void do_unblank_screen(int leaving_gfx)
3746 {
3747         struct vc_data *vc;
3748
3749         /* This should now always be called from a "sane" (read: can schedule)
3750          * context for the sake of the low level drivers, except in the special
3751          * case of oops_in_progress
3752          */
3753         if (!oops_in_progress)
3754                 might_sleep();
3755
3756         WARN_CONSOLE_UNLOCKED();
3757
3758         ignore_poke = 0;
3759         if (!console_blanked)
3760                 return;
3761         if (!vc_cons_allocated(fg_console)) {
3762                 /* impossible */
3763                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3764                 return;
3765         }
3766         vc = vc_cons[fg_console].d;
3767         if (vc->vc_mode != KD_TEXT)
3768                 return; /* but leave console_blanked != 0 */
3769
3770         if (blankinterval) {
3771                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3772                 blank_state = blank_normal_wait;
3773         }
3774
3775         console_blanked = 0;
3776         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3777                 /* Low-level driver cannot restore -> do it ourselves */
3778                 update_screen(vc);
3779         if (console_blank_hook)
3780                 console_blank_hook(0);
3781         set_palette(vc);
3782         set_cursor(vc);
3783         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3784 }
3785 EXPORT_SYMBOL(do_unblank_screen);
3786
3787 /*
3788  * This is called by the outside world to cause a forced unblank, mostly for
3789  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3790  * call it with 1 as an argument and so force a mode restore... that may kill
3791  * X or at least garbage the screen but would also make the Oops visible...
3792  */
3793 void unblank_screen(void)
3794 {
3795         do_unblank_screen(0);
3796 }
3797
3798 /*
3799  * We defer the timer blanking to work queue so it can take the console mutex
3800  * (console operations can still happen at irq time, but only from printk which
3801  * has the console mutex. Not perfect yet, but better than no locking
3802  */
3803 static void blank_screen_t(unsigned long dummy)
3804 {
3805         if (unlikely(!keventd_up())) {
3806                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3807                 return;
3808         }
3809         blank_timer_expired = 1;
3810         schedule_work(&console_work);
3811 }
3812
3813 void poke_blanked_console(void)
3814 {
3815         WARN_CONSOLE_UNLOCKED();
3816
3817         /* Add this so we quickly catch whoever might call us in a non
3818          * safe context. Nowadays, unblank_screen() isn't to be called in
3819          * atomic contexts and is allowed to schedule (with the special case
3820          * of oops_in_progress, but that isn't of any concern for this
3821          * function. --BenH.
3822          */
3823         might_sleep();
3824
3825         /* This isn't perfectly race free, but a race here would be mostly harmless,
3826          * at worse, we'll do a spurrious blank and it's unlikely
3827          */
3828         del_timer(&console_timer);
3829         blank_timer_expired = 0;
3830
3831         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3832                 return;
3833         if (console_blanked)
3834                 unblank_screen();
3835         else if (blankinterval) {
3836                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3837                 blank_state = blank_normal_wait;
3838         }
3839 }
3840
3841 /*
3842  *      Palettes
3843  */
3844
3845 static void set_palette(struct vc_data *vc)
3846 {
3847         WARN_CONSOLE_UNLOCKED();
3848
3849         if (vc->vc_mode != KD_GRAPHICS)
3850                 vc->vc_sw->con_set_palette(vc, color_table);
3851 }
3852
3853 static int set_get_cmap(unsigned char __user *arg, int set)
3854 {
3855     int i, j, k;
3856
3857     WARN_CONSOLE_UNLOCKED();
3858
3859     for (i = 0; i < 16; i++)
3860         if (set) {
3861             get_user(default_red[i], arg++);
3862             get_user(default_grn[i], arg++);
3863             get_user(default_blu[i], arg++);
3864         } else {
3865             put_user(default_red[i], arg++);
3866             put_user(default_grn[i], arg++);
3867             put_user(default_blu[i], arg++);
3868         }
3869     if (set) {
3870         for (i = 0; i < MAX_NR_CONSOLES; i++)
3871             if (vc_cons_allocated(i)) {
3872                 for (j = k = 0; j < 16; j++) {
3873                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3874                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3875                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3876                 }
3877                 set_palette(vc_cons[i].d);
3878             }
3879     }
3880     return 0;
3881 }
3882
3883 /*
3884  * Load palette into the DAC registers. arg points to a colour
3885  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3886  */
3887
3888 int con_set_cmap(unsigned char __user *arg)
3889 {
3890         int rc;
3891
3892         acquire_console_sem();
3893         rc = set_get_cmap (arg,1);
3894         release_console_sem();
3895
3896         return rc;
3897 }
3898
3899 int con_get_cmap(unsigned char __user *arg)
3900 {
3901         int rc;
3902
3903         acquire_console_sem();
3904         rc = set_get_cmap (arg,0);
3905         release_console_sem();
3906
3907         return rc;
3908 }
3909
3910 void reset_palette(struct vc_data *vc)
3911 {
3912         int j, k;
3913         for (j=k=0; j<16; j++) {
3914                 vc->vc_palette[k++] = default_red[j];
3915                 vc->vc_palette[k++] = default_grn[j];
3916                 vc->vc_palette[k++] = default_blu[j];
3917         }
3918         set_palette(vc);
3919 }
3920
3921 /*
3922  *  Font switching
3923  *
3924  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3925  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3926  *  depending on width) reserved for each character which is kinda wasty, but
3927  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3928  *  is upto the actual low-level console-driver convert data into its favorite
3929  *  format (maybe we should add a `fontoffset' field to the `display'
3930  *  structure so we won't have to convert the fontdata all the time.
3931  *  /Jes
3932  */
3933
3934 #define max_font_size 65536
3935
3936 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3937 {
3938         struct console_font font;
3939         int rc = -EINVAL;
3940         int c;
3941
3942         if (vc->vc_mode != KD_TEXT)
3943                 return -EINVAL;
3944
3945         if (op->data) {
3946                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3947                 if (!font.data)
3948                         return -ENOMEM;
3949         } else
3950                 font.data = NULL;
3951
3952         acquire_console_sem();
3953         if (vc->vc_sw->con_font_get)
3954                 rc = vc->vc_sw->con_font_get(vc, &font);
3955         else
3956                 rc = -ENOSYS;
3957         release_console_sem();
3958
3959         if (rc)
3960                 goto out;
3961
3962         c = (font.width+7)/8 * 32 * font.charcount;
3963
3964         if (op->data && font.charcount > op->charcount)
3965                 rc = -ENOSPC;
3966         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3967                 if (font.width > op->width || font.height > op->height)
3968                         rc = -ENOSPC;
3969         } else {
3970                 if (font.width != 8)
3971                         rc = -EIO;
3972                 else if ((op->height && font.height > op->height) ||
3973                          font.height > 32)
3974                         rc = -ENOSPC;
3975         }
3976         if (rc)
3977                 goto out;
3978
3979         op->height = font.height;
3980         op->width = font.width;
3981         op->charcount = font.charcount;
3982
3983         if (op->data && copy_to_user(op->data, font.data, c))
3984                 rc = -EFAULT;
3985
3986 out:
3987         kfree(font.data);
3988         return rc;
3989 }
3990
3991 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3992 {
3993         struct console_font font;
3994         int rc = -EINVAL;
3995         int size;
3996
3997         if (vc->vc_mode != KD_TEXT)
3998                 return -EINVAL;
3999         if (!op->data)
4000                 return -EINVAL;
4001         if (op->charcount > 512)
4002                 return -EINVAL;
4003         if (!op->height) {              /* Need to guess font height [compat] */
4004                 int h, i;
4005                 u8 __user *charmap = op->data;
4006                 u8 tmp;
4007
4008                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4009                    so that we can get rid of this soon */
4010                 if (!(op->flags & KD_FONT_FLAG_OLD))
4011                         return -EINVAL;
4012                 for (h = 32; h > 0; h--)
4013                         for (i = 0; i < op->charcount; i++) {
4014                                 if (get_user(tmp, &charmap[32*i+h-1]))
4015                                         return -EFAULT;
4016                                 if (tmp)
4017                                         goto nonzero;
4018                         }
4019                 return -EINVAL;
4020         nonzero:
4021                 op->height = h;
4022         }
4023         if (op->width <= 0 || op->width > 32 || op->height > 32)
4024                 return -EINVAL;
4025         size = (op->width+7)/8 * 32 * op->charcount;
4026         if (size > max_font_size)
4027                 return -ENOSPC;
4028         font.charcount = op->charcount;
4029         font.height = op->height;
4030         font.width = op->width;
4031         font.data = memdup_user(op->data, size);
4032         if (IS_ERR(font.data))
4033                 return PTR_ERR(font.data);
4034         acquire_console_sem();
4035         if (vc->vc_sw->con_font_set)
4036                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4037         else
4038                 rc = -ENOSYS;
4039         release_console_sem();
4040         kfree(font.data);
4041         return rc;
4042 }
4043
4044 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4045 {
4046         struct console_font font = {.width = op->width, .height = op->height};
4047         char name[MAX_FONT_NAME];
4048         char *s = name;
4049         int rc;
4050
4051         if (vc->vc_mode != KD_TEXT)
4052                 return -EINVAL;
4053
4054         if (!op->data)
4055                 s = NULL;
4056         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4057                 return -EFAULT;
4058         else
4059                 name[MAX_FONT_NAME - 1] = 0;
4060
4061         acquire_console_sem();
4062         if (vc->vc_sw->con_font_default)
4063                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4064         else
4065                 rc = -ENOSYS;
4066         release_console_sem();
4067         if (!rc) {
4068                 op->width = font.width;
4069                 op->height = font.height;
4070         }
4071         return rc;
4072 }
4073
4074 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4075 {
4076         int con = op->height;
4077         int rc;
4078
4079         if (vc->vc_mode != KD_TEXT)
4080                 return -EINVAL;
4081
4082         acquire_console_sem();
4083         if (!vc->vc_sw->con_font_copy)
4084                 rc = -ENOSYS;
4085         else if (con < 0 || !vc_cons_allocated(con))
4086                 rc = -ENOTTY;
4087         else if (con == vc->vc_num)     /* nothing to do */
4088                 rc = 0;
4089         else
4090                 rc = vc->vc_sw->con_font_copy(vc, con);
4091         release_console_sem();
4092         return rc;
4093 }
4094
4095 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4096 {
4097         switch (op->op) {
4098         case KD_FONT_OP_SET:
4099                 return con_font_set(vc, op);
4100         case KD_FONT_OP_GET:
4101                 return con_font_get(vc, op);
4102         case KD_FONT_OP_SET_DEFAULT:
4103                 return con_font_default(vc, op);
4104         case KD_FONT_OP_COPY:
4105                 return con_font_copy(vc, op);
4106         }
4107         return -ENOSYS;
4108 }
4109
4110 /*
4111  *      Interface exported to selection and vcs.
4112  */
4113
4114 /* used by selection */
4115 u16 screen_glyph(struct vc_data *vc, int offset)
4116 {
4117         u16 w = scr_readw(screenpos(vc, offset, 1));
4118         u16 c = w & 0xff;
4119
4120         if (w & vc->vc_hi_font_mask)
4121                 c |= 0x100;
4122         return c;
4123 }
4124 EXPORT_SYMBOL_GPL(screen_glyph);
4125
4126 /* used by vcs - note the word offset */
4127 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4128 {
4129         return screenpos(vc, 2 * w_offset, viewed);
4130 }
4131
4132 void getconsxy(struct vc_data *vc, unsigned char *p)
4133 {
4134         p[0] = vc->vc_x;
4135         p[1] = vc->vc_y;
4136 }
4137
4138 void putconsxy(struct vc_data *vc, unsigned char *p)
4139 {
4140         hide_cursor(vc);
4141         gotoxy(vc, p[0], p[1]);
4142         set_cursor(vc);
4143 }
4144
4145 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4146 {
4147         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4148                 return softcursor_original;
4149         return scr_readw(org);
4150 }
4151
4152 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4153 {
4154         scr_writew(val, org);
4155         if ((unsigned long)org == vc->vc_pos) {
4156                 softcursor_original = -1;
4157                 add_softcursor(vc);
4158         }
4159 }
4160
4161 /*
4162  *      Visible symbols for modules
4163  */
4164
4165 EXPORT_SYMBOL(color_table);
4166 EXPORT_SYMBOL(default_red);
4167 EXPORT_SYMBOL(default_grn);
4168 EXPORT_SYMBOL(default_blu);
4169 EXPORT_SYMBOL(update_region);
4170 EXPORT_SYMBOL(redraw_screen);
4171 EXPORT_SYMBOL(vc_resize);
4172 EXPORT_SYMBOL(fg_console);
4173 EXPORT_SYMBOL(console_blank_hook);
4174 EXPORT_SYMBOL(console_blanked);
4175 EXPORT_SYMBOL(vc_cons);
4176 EXPORT_SYMBOL(global_cursor_default);
4177 #ifndef VT_SINGLE_DRIVER
4178 EXPORT_SYMBOL(take_over_console);
4179 EXPORT_SYMBOL(give_up_console);
4180 #endif