drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <g-hunt@ee.utah.edu>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21  *
  22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <poe@daimi.aau.dk>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <geert@linux-m68k.org>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <arno@usn.nl>
  39  *     - David Carter <carter@cs.bris.ac.uk>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111
 112 struct con_driver {
 113         const struct consw *con;
 114         const char *desc;
 115         struct device *dev;
 116         int node;
 117         int first;
 118         int last;
 119         int flag;
 120 };
 121
 122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 123 const struct consw *conswitchp;
 124
 125 /* A bitmap for codes <32. A bit of 1 indicates that the code
 126  * corresponding to that bit number invokes some special action
 127  * (such as cursor movement) and should not be displayed as a
 128  * glyph unless the disp_ctrl mode is explicitly enabled.
 129  */
 130 #define CTRL_ACTION 0x0d00ff81
 131 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 132
 133 /*
 134  * Here is the default bell parameters: 750HZ, 1/8th of a second
 135  */
 136 #define DEFAULT_BELL_PITCH      750
 137 #define DEFAULT_BELL_DURATION   (HZ/8)
 138
 139 struct vc vc_cons [MAX_NR_CONSOLES];
 140
 141 #ifndef VT_SINGLE_DRIVER
 142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 143 #endif
 144
 145 static int con_open(struct tty_struct *, struct file *);
 146 static void vc_init(struct vc_data *vc, unsigned int rows,
 147                     unsigned int cols, int do_clear);
 148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 149 static void save_cur(struct vc_data *vc);
 150 static void reset_terminal(struct vc_data *vc, int do_clear);
 151 static void con_flush_chars(struct tty_struct *tty);
 152 static int set_vesa_blanking(char __user *p);
 153 static void set_cursor(struct vc_data *vc);
 154 static void hide_cursor(struct vc_data *vc);
 155 static void console_callback(struct work_struct *ignored);
 156 static void blank_screen_t(unsigned long dummy);
 157 static void set_palette(struct vc_data *vc);
 158
 159 static int printable;           /* Is console ready for printing? */
 160 int default_utf8 = true;
 161 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 162 int global_cursor_default = -1;
 163 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 164
 165 static int cur_default = CUR_DEFAULT;
 166 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 167
 168 /*
 169  * ignore_poke: don't unblank the screen when things are typed.  This is
 170  * mainly for the privacy of braille terminal users.
 171  */
 172 static int ignore_poke;
 173
 174 int do_poke_blanked_console;
 175 int console_blanked;
 176
 177 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 178 static int vesa_off_interval;
 179 static int blankinterval = 10*60;
 180 core_param(consoleblank, blankinterval, int, 0444);
 181
 182 static DECLARE_WORK(console_work, console_callback);
 183
 184 /*
 185  * fg_console is the current virtual console,
 186  * last_console is the last used one,
 187  * want_console is the console we want to switch to,
 188  * saved_* variants are for save/restore around kernel debugger enter/leave
 189  */
 190 int fg_console;
 191 int last_console;
 192 int want_console = -1;
 193 static int saved_fg_console;
 194 static int saved_last_console;
 195 static int saved_want_console;
 196 static int saved_vc_mode;
 197 static int saved_console_blanked;
 198
 199 /*
 200  * For each existing display, we have a pointer to console currently visible
 201  * on that display, allowing consoles other than fg_console to be refreshed
 202  * appropriately. Unless the low-level driver supplies its own display_fg
 203  * variable, we use this one for the "master display".
 204  */
 205 static struct vc_data *master_display_fg;
 206
 207 /*
 208  * Unfortunately, we need to delay tty echo when we're currently writing to the
 209  * console since the code is (and always was) not re-entrant, so we schedule
 210  * all flip requests to process context with schedule-task() and run it from
 211  * console_callback().
 212  */
 213
 214 /*
 215  * For the same reason, we defer scrollback to the console callback.
 216  */
 217 static int scrollback_delta;
 218
 219 /*
 220  * Hook so that the power management routines can (un)blank
 221  * the console on our behalf.
 222  */
 223 int (*console_blank_hook)(int);
 224
 225 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 226 static int blank_state;
 227 static int blank_timer_expired;
 228 enum {
 229         blank_off = 0,
 230         blank_normal_wait,
 231         blank_vesa_wait,
 232 };
 233
 234 /*
 235  * /sys/class/tty/tty0/
 236  *
 237  * the attribute 'active' contains the name of the current vc
 238  * console and it supports poll() to detect vc switches
 239  */
 240 static struct device *tty0dev;
 241
 242 /*
 243  * Notifier list for console events.
 244  */
 245 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 246
 247 int register_vt_notifier(struct notifier_block *nb)
 248 {
 249         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 250 }
 251 EXPORT_SYMBOL_GPL(register_vt_notifier);
 252
 253 int unregister_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 258
 259 static void notify_write(struct vc_data *vc, unsigned int unicode)
 260 {
 261         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 262         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 263 }
 264
 265 static void notify_update(struct vc_data *vc)
 266 {
 267         struct vt_notifier_param param = { .vc = vc };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 269 }
 270 /*
 271  *      Low-Level Functions
 272  */
 273
 274 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 275
 276 #ifdef VT_BUF_VRAM_ONLY
 277 #define DO_UPDATE(vc)   0
 278 #else
 279 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 280 #endif
 281
 282 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 283 {
 284         unsigned short *p;
 285
 286         if (!viewed)
 287                 p = (unsigned short *)(vc->vc_origin + offset);
 288         else if (!vc->vc_sw->con_screen_pos)
 289                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 290         else
 291                 p = vc->vc_sw->con_screen_pos(vc, offset);
 292         return p;
 293 }
 294
 295 /* Called  from the keyboard irq path.. */
 296 static inline void scrolldelta(int lines)
 297 {
 298         /* FIXME */
 299         /* scrolldelta needs some kind of consistency lock, but the BKL was
 300            and still is not protecting versus the scheduled back end */
 301         scrollback_delta += lines;
 302         schedule_console_callback();
 303 }
 304
 305 void schedule_console_callback(void)
 306 {
 307         schedule_work(&console_work);
 308 }
 309
 310 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 311 {
 312         unsigned short *d, *s;
 313
 314         if (t+nr >= b)
 315                 nr = b - t - 1;
 316         if (b > vc->vc_rows || t >= b || nr < 1)
 317                 return;
 318         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 319                 return;
 320         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 321         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 322         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 323         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 324                     vc->vc_size_row * nr);
 325 }
 326
 327 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 328 {
 329         unsigned short *s;
 330         unsigned int step;
 331
 332         if (t+nr >= b)
 333                 nr = b - t - 1;
 334         if (b > vc->vc_rows || t >= b || nr < 1)
 335                 return;
 336         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 337                 return;
 338         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 339         step = vc->vc_cols * nr;
 340         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 341         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 342 }
 343
 344 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 345 {
 346 #ifndef VT_BUF_VRAM_ONLY
 347         unsigned int xx, yy, offset;
 348         u16 *p;
 349
 350         p = (u16 *) start;
 351         if (!vc->vc_sw->con_getxy) {
 352                 offset = (start - vc->vc_origin) / 2;
 353                 xx = offset % vc->vc_cols;
 354                 yy = offset / vc->vc_cols;
 355         } else {
 356                 int nxx, nyy;
 357                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 358                 xx = nxx; yy = nyy;
 359         }
 360         for(;;) {
 361                 u16 attrib = scr_readw(p) & 0xff00;
 362                 int startx = xx;
 363                 u16 *q = p;
 364                 while (xx < vc->vc_cols && count) {
 365                         if (attrib != (scr_readw(p) & 0xff00)) {
 366                                 if (p > q)
 367                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 368                                 startx = xx;
 369                                 q = p;
 370                                 attrib = scr_readw(p) & 0xff00;
 371                         }
 372                         p++;
 373                         xx++;
 374                         count--;
 375                 }
 376                 if (p > q)
 377                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 378                 if (!count)
 379                         break;
 380                 xx = 0;
 381                 yy++;
 382                 if (vc->vc_sw->con_getxy) {
 383                         p = (u16 *)start;
 384                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 385                 }
 386         }
 387 #endif
 388 }
 389
 390 void update_region(struct vc_data *vc, unsigned long start, int count)
 391 {
 392         WARN_CONSOLE_UNLOCKED();
 393
 394         if (DO_UPDATE(vc)) {
 395                 hide_cursor(vc);
 396                 do_update_region(vc, start, count);
 397                 set_cursor(vc);
 398         }
 399 }
 400
 401 /* Structure of attributes is hardware-dependent */
 402
 403 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 404     u8 _underline, u8 _reverse, u8 _italic)
 405 {
 406         if (vc->vc_sw->con_build_attr)
 407                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 408                        _blink, _underline, _reverse, _italic);
 409
 410 #ifndef VT_BUF_VRAM_ONLY
 411 /*
 412  * ++roman: I completely changed the attribute format for monochrome
 413  * mode (!can_do_color). The formerly used MDA (monochrome display
 414  * adapter) format didn't allow the combination of certain effects.
 415  * Now the attribute is just a bit vector:
 416  *  Bit 0..1: intensity (0..2)
 417  *  Bit 2   : underline
 418  *  Bit 3   : reverse
 419  *  Bit 7   : blink
 420  */
 421         {
 422         u8 a = _color;
 423         if (!vc->vc_can_do_color)
 424                 return _intensity |
 425                        (_italic ? 2 : 0) |
 426                        (_underline ? 4 : 0) |
 427                        (_reverse ? 8 : 0) |
 428                        (_blink ? 0x80 : 0);
 429         if (_italic)
 430                 a = (a & 0xF0) | vc->vc_itcolor;
 431         else if (_underline)
 432                 a = (a & 0xf0) | vc->vc_ulcolor;
 433         else if (_intensity == 0)
 434                 a = (a & 0xf0) | vc->vc_ulcolor;
 435         if (_reverse)
 436                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 437         if (_blink)
 438                 a ^= 0x80;
 439         if (_intensity == 2)
 440                 a ^= 0x08;
 441         if (vc->vc_hi_font_mask == 0x100)
 442                 a <<= 1;
 443         return a;
 444         }
 445 #else
 446         return 0;
 447 #endif
 448 }
 449
 450 static void update_attr(struct vc_data *vc)
 451 {
 452         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 453                       vc->vc_blink, vc->vc_underline,
 454                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 455         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 456 }
 457
 458 /* Note: inverting the screen twice should revert to the original state */
 459 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 460 {
 461         unsigned short *p;
 462
 463         WARN_CONSOLE_UNLOCKED();
 464
 465         count /= 2;
 466         p = screenpos(vc, offset, viewed);
 467         if (vc->vc_sw->con_invert_region)
 468                 vc->vc_sw->con_invert_region(vc, p, count);
 469 #ifndef VT_BUF_VRAM_ONLY
 470         else {
 471                 u16 *q = p;
 472                 int cnt = count;
 473                 u16 a;
 474
 475                 if (!vc->vc_can_do_color) {
 476                         while (cnt--) {
 477                             a = scr_readw(q);
 478                             a ^= 0x0800;
 479                             scr_writew(a, q);
 480                             q++;
 481                         }
 482                 } else if (vc->vc_hi_font_mask == 0x100) {
 483                         while (cnt--) {
 484                                 a = scr_readw(q);
 485                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 486                                 scr_writew(a, q);
 487                                 q++;
 488                         }
 489                 } else {
 490                         while (cnt--) {
 491                                 a = scr_readw(q);
 492                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 493                                 scr_writew(a, q);
 494                                 q++;
 495                         }
 496                 }
 497         }
 498 #endif
 499         if (DO_UPDATE(vc))
 500                 do_update_region(vc, (unsigned long) p, count);
 501 }
 502
 503 /* used by selection: complement pointer position */
 504 void complement_pos(struct vc_data *vc, int offset)
 505 {
 506         static int old_offset = -1;
 507         static unsigned short old;
 508         static unsigned short oldx, oldy;
 509
 510         WARN_CONSOLE_UNLOCKED();
 511
 512         if (old_offset != -1 && old_offset >= 0 &&
 513             old_offset < vc->vc_screenbuf_size) {
 514                 scr_writew(old, screenpos(vc, old_offset, 1));
 515                 if (DO_UPDATE(vc))
 516                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 517         }
 518
 519         old_offset = offset;
 520
 521         if (offset != -1 && offset >= 0 &&
 522             offset < vc->vc_screenbuf_size) {
 523                 unsigned short new;
 524                 unsigned short *p;
 525                 p = screenpos(vc, offset, 1);
 526                 old = scr_readw(p);
 527                 new = old ^ vc->vc_complement_mask;
 528                 scr_writew(new, p);
 529                 if (DO_UPDATE(vc)) {
 530                         oldx = (offset >> 1) % vc->vc_cols;
 531                         oldy = (offset >> 1) / vc->vc_cols;
 532                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 533                 }
 534         }
 535
 536 }
 537
 538 static void insert_char(struct vc_data *vc, unsigned int nr)
 539 {
 540         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 541
 542         p = q + vc->vc_cols - nr - vc->vc_x;
 543         while (--p >= q)
 544                 scr_writew(scr_readw(p), p + nr);
 545         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 546         vc->vc_need_wrap = 0;
 547         if (DO_UPDATE(vc)) {
 548                 unsigned short oldattr = vc->vc_attr;
 549                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 550                                      vc->vc_cols - vc->vc_x - nr);
 551                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 552                 while (nr--)
 553                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 554                 vc->vc_attr = oldattr;
 555         }
 556 }
 557
 558 static void delete_char(struct vc_data *vc, unsigned int nr)
 559 {
 560         unsigned int i = vc->vc_x;
 561         unsigned short *p = (unsigned short *)vc->vc_pos;
 562
 563         while (++i <= vc->vc_cols - nr) {
 564                 scr_writew(scr_readw(p+nr), p);
 565                 p++;
 566         }
 567         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 568         vc->vc_need_wrap = 0;
 569         if (DO_UPDATE(vc)) {
 570                 unsigned short oldattr = vc->vc_attr;
 571                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 572                                      vc->vc_cols - vc->vc_x - nr);
 573                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 574                 while (nr--)
 575                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 576                                      vc->vc_cols - 1 - nr);
 577                 vc->vc_attr = oldattr;
 578         }
 579 }
 580
 581 static int softcursor_original;
 582
 583 static void add_softcursor(struct vc_data *vc)
 584 {
 585         int i = scr_readw((u16 *) vc->vc_pos);
 586         u32 type = vc->vc_cursor_type;
 587
 588         if (! (type & 0x10)) return;
 589         if (softcursor_original != -1) return;
 590         softcursor_original = i;
 591         i |= ((type >> 8) & 0xff00 );
 592         i ^= ((type) & 0xff00 );
 593         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 594         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 595         scr_writew(i, (u16 *) vc->vc_pos);
 596         if (DO_UPDATE(vc))
 597                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 598 }
 599
 600 static void hide_softcursor(struct vc_data *vc)
 601 {
 602         if (softcursor_original != -1) {
 603                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 604                 if (DO_UPDATE(vc))
 605                         vc->vc_sw->con_putc(vc, softcursor_original,
 606                                         vc->vc_y, vc->vc_x);
 607                 softcursor_original = -1;
 608         }
 609 }
 610
 611 static void hide_cursor(struct vc_data *vc)
 612 {
 613         if (vc == sel_cons)
 614                 clear_selection();
 615         vc->vc_sw->con_cursor(vc, CM_ERASE);
 616         hide_softcursor(vc);
 617 }
 618
 619 static void set_cursor(struct vc_data *vc)
 620 {
 621         if (!IS_FG(vc) || console_blanked ||
 622             vc->vc_mode == KD_GRAPHICS)
 623                 return;
 624         if (vc->vc_deccm) {
 625                 if (vc == sel_cons)
 626                         clear_selection();
 627                 add_softcursor(vc);
 628                 if ((vc->vc_cursor_type & 0x0f) != 1)
 629                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 630         } else
 631                 hide_cursor(vc);
 632 }
 633
 634 static void set_origin(struct vc_data *vc)
 635 {
 636         WARN_CONSOLE_UNLOCKED();
 637
 638         if (!CON_IS_VISIBLE(vc) ||
 639             !vc->vc_sw->con_set_origin ||
 640             !vc->vc_sw->con_set_origin(vc))
 641                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 642         vc->vc_visible_origin = vc->vc_origin;
 643         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 644         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 645 }
 646
 647 static inline void save_screen(struct vc_data *vc)
 648 {
 649         WARN_CONSOLE_UNLOCKED();
 650
 651         if (vc->vc_sw->con_save_screen)
 652                 vc->vc_sw->con_save_screen(vc);
 653 }
 654
 655 /*
 656  *      Redrawing of screen
 657  */
 658
 659 static void clear_buffer_attributes(struct vc_data *vc)
 660 {
 661         unsigned short *p = (unsigned short *)vc->vc_origin;
 662         int count = vc->vc_screenbuf_size / 2;
 663         int mask = vc->vc_hi_font_mask | 0xff;
 664
 665         for (; count > 0; count--, p++) {
 666                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 667         }
 668 }
 669
 670 void redraw_screen(struct vc_data *vc, int is_switch)
 671 {
 672         int redraw = 0;
 673
 674         WARN_CONSOLE_UNLOCKED();
 675
 676         if (!vc) {
 677                 /* strange ... */
 678                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 679                 return;
 680         }
 681
 682         if (is_switch) {
 683                 struct vc_data *old_vc = vc_cons[fg_console].d;
 684                 if (old_vc == vc)
 685                         return;
 686                 if (!CON_IS_VISIBLE(vc))
 687                         redraw = 1;
 688                 *vc->vc_display_fg = vc;
 689                 fg_console = vc->vc_num;
 690                 hide_cursor(old_vc);
 691                 if (!CON_IS_VISIBLE(old_vc)) {
 692                         save_screen(old_vc);
 693                         set_origin(old_vc);
 694                 }
 695                 if (tty0dev)
 696                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 697         } else {
 698                 hide_cursor(vc);
 699                 redraw = 1;
 700         }
 701
 702         if (redraw) {
 703                 int update;
 704                 int old_was_color = vc->vc_can_do_color;
 705
 706                 set_origin(vc);
 707                 update = vc->vc_sw->con_switch(vc);
 708                 set_palette(vc);
 709                 /*
 710                  * If console changed from mono<->color, the best we can do
 711                  * is to clear the buffer attributes. As it currently stands,
 712                  * rebuilding new attributes from the old buffer is not doable
 713                  * without overly complex code.
 714                  */
 715                 if (old_was_color != vc->vc_can_do_color) {
 716                         update_attr(vc);
 717                         clear_buffer_attributes(vc);
 718                 }
 719
 720                 /* Forcibly update if we're panicing */
 721                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 722                     vt_force_oops_output(vc))
 723                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 724         }
 725         set_cursor(vc);
 726         if (is_switch) {
 727                 set_leds();
 728                 compute_shiftstate();
 729                 notify_update(vc);
 730         }
 731 }
 732
 733 /*
 734  *      Allocation, freeing and resizing of VTs.
 735  */
 736
 737 int vc_cons_allocated(unsigned int i)
 738 {
 739         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 740 }
 741
 742 static void visual_init(struct vc_data *vc, int num, int init)
 743 {
 744         /* ++Geert: vc->vc_sw->con_init determines console size */
 745         if (vc->vc_sw)
 746                 module_put(vc->vc_sw->owner);
 747         vc->vc_sw = conswitchp;
 748 #ifndef VT_SINGLE_DRIVER
 749         if (con_driver_map[num])
 750                 vc->vc_sw = con_driver_map[num];
 751 #endif
 752         __module_get(vc->vc_sw->owner);
 753         vc->vc_num = num;
 754         vc->vc_display_fg = &master_display_fg;
 755         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 756         vc->vc_uni_pagedir = 0;
 757         vc->vc_hi_font_mask = 0;
 758         vc->vc_complement_mask = 0;
 759         vc->vc_can_do_color = 0;
 760         vc->vc_panic_force_write = false;
 761         vc->vc_sw->con_init(vc, init);
 762         if (!vc->vc_complement_mask)
 763                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 764         vc->vc_s_complement_mask = vc->vc_complement_mask;
 765         vc->vc_size_row = vc->vc_cols << 1;
 766         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 767 }
 768
 769 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 770 {
 771         WARN_CONSOLE_UNLOCKED();
 772
 773         if (currcons >= MAX_NR_CONSOLES)
 774                 return -ENXIO;
 775         if (!vc_cons[currcons].d) {
 776             struct vc_data *vc;
 777             struct vt_notifier_param param;
 778
 779             /* prevent users from taking too much memory */
 780             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 781               return -EPERM;
 782
 783             /* due to the granularity of kmalloc, we waste some memory here */
 784             /* the alloc is done in two steps, to optimize the common situation
 785                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 786             /* although the numbers above are not valid since long ago, the
 787                point is still up-to-date and the comment still has its value
 788                even if only as a historical artifact.  --mj, July 1998 */
 789             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 790             if (!vc)
 791                 return -ENOMEM;
 792             vc_cons[currcons].d = vc;
 793             tty_port_init(&vc->port);
 794             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 795             visual_init(vc, currcons, 1);
 796             if (!*vc->vc_uni_pagedir_loc)
 797                 con_set_default_unimap(vc);
 798             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 799             if (!vc->vc_screenbuf) {
 800                 kfree(vc);
 801                 vc_cons[currcons].d = NULL;
 802                 return -ENOMEM;
 803             }
 804
 805             /* If no drivers have overridden us and the user didn't pass a
 806                boot option, default to displaying the cursor */
 807             if (global_cursor_default == -1)
 808                     global_cursor_default = 1;
 809
 810             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 811             vcs_make_sysfs(currcons);
 812             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 813         }
 814         return 0;
 815 }
 816
 817 static inline int resize_screen(struct vc_data *vc, int width, int height,
 818                                 int user)
 819 {
 820         /* Resizes the resolution of the display adapater */
 821         int err = 0;
 822
 823         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 824                 err = vc->vc_sw->con_resize(vc, width, height, user);
 825
 826         return err;
 827 }
 828
 829 /*
 830  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 831  * [this is to be used together with some user program
 832  * like resize that changes the hardware videomode]
 833  */
 834 #define VC_RESIZE_MAXCOL (32767)
 835 #define VC_RESIZE_MAXROW (32767)
 836
 837 /**
 838  *      vc_do_resize    -       resizing method for the tty
 839  *      @tty: tty being resized
 840  *      @real_tty: real tty (different to tty if a pty/tty pair)
 841  *      @vc: virtual console private data
 842  *      @cols: columns
 843  *      @lines: lines
 844  *
 845  *      Resize a virtual console, clipping according to the actual constraints.
 846  *      If the caller passes a tty structure then update the termios winsize
 847  *      information and perform any necessary signal handling.
 848  *
 849  *      Caller must hold the console semaphore. Takes the termios mutex and
 850  *      ctrl_lock of the tty IFF a tty is passed.
 851  */
 852
 853 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 854                                 unsigned int cols, unsigned int lines)
 855 {
 856         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 857         unsigned long end;
 858         unsigned int old_rows, old_row_size;
 859         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 860         unsigned int user;
 861         unsigned short *newscreen;
 862
 863         WARN_CONSOLE_UNLOCKED();
 864
 865         if (!vc)
 866                 return -ENXIO;
 867
 868         user = vc->vc_resize_user;
 869         vc->vc_resize_user = 0;
 870
 871         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 872                 return -EINVAL;
 873
 874         new_cols = (cols ? cols : vc->vc_cols);
 875         new_rows = (lines ? lines : vc->vc_rows);
 876         new_row_size = new_cols << 1;
 877         new_screen_size = new_row_size * new_rows;
 878
 879         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 880                 return 0;
 881
 882         newscreen = kmalloc(new_screen_size, GFP_USER);
 883         if (!newscreen)
 884                 return -ENOMEM;
 885
 886         old_rows = vc->vc_rows;
 887         old_row_size = vc->vc_size_row;
 888
 889         err = resize_screen(vc, new_cols, new_rows, user);
 890         if (err) {
 891                 kfree(newscreen);
 892                 return err;
 893         }
 894
 895         vc->vc_rows = new_rows;
 896         vc->vc_cols = new_cols;
 897         vc->vc_size_row = new_row_size;
 898         vc->vc_screenbuf_size = new_screen_size;
 899
 900         rlth = min(old_row_size, new_row_size);
 901         rrem = new_row_size - rlth;
 902         old_origin = vc->vc_origin;
 903         new_origin = (long) newscreen;
 904         new_scr_end = new_origin + new_screen_size;
 905
 906         if (vc->vc_y > new_rows) {
 907                 if (old_rows - vc->vc_y < new_rows) {
 908                         /*
 909                          * Cursor near the bottom, copy contents from the
 910                          * bottom of buffer
 911                          */
 912                         old_origin += (old_rows - new_rows) * old_row_size;
 913                 } else {
 914                         /*
 915                          * Cursor is in no man's land, copy 1/2 screenful
 916                          * from the top and bottom of cursor position
 917                          */
 918                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 919                 }
 920         }
 921
 922         end = old_origin + old_row_size * min(old_rows, new_rows);
 923
 924         update_attr(vc);
 925
 926         while (old_origin < end) {
 927                 scr_memcpyw((unsigned short *) new_origin,
 928                             (unsigned short *) old_origin, rlth);
 929                 if (rrem)
 930                         scr_memsetw((void *)(new_origin + rlth),
 931                                     vc->vc_video_erase_char, rrem);
 932                 old_origin += old_row_size;
 933                 new_origin += new_row_size;
 934         }
 935         if (new_scr_end > new_origin)
 936                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 937                             new_scr_end - new_origin);
 938         kfree(vc->vc_screenbuf);
 939         vc->vc_screenbuf = newscreen;
 940         vc->vc_screenbuf_size = new_screen_size;
 941         set_origin(vc);
 942
 943         /* do part of a reset_terminal() */
 944         vc->vc_top = 0;
 945         vc->vc_bottom = vc->vc_rows;
 946         gotoxy(vc, vc->vc_x, vc->vc_y);
 947         save_cur(vc);
 948
 949         if (tty) {
 950                 /* Rewrite the requested winsize data with the actual
 951                    resulting sizes */
 952                 struct winsize ws;
 953                 memset(&ws, 0, sizeof(ws));
 954                 ws.ws_row = vc->vc_rows;
 955                 ws.ws_col = vc->vc_cols;
 956                 ws.ws_ypixel = vc->vc_scan_lines;
 957                 tty_do_resize(tty, &ws);
 958         }
 959
 960         if (CON_IS_VISIBLE(vc))
 961                 update_screen(vc);
 962         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 963         return err;
 964 }
 965
 966 /**
 967  *      vc_resize               -       resize a VT
 968  *      @vc: virtual console
 969  *      @cols: columns
 970  *      @rows: rows
 971  *
 972  *      Resize a virtual console as seen from the console end of things. We
 973  *      use the common vc_do_resize methods to update the structures. The
 974  *      caller must hold the console sem to protect console internals and
 975  *      vc->port.tty
 976  */
 977
 978 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 979 {
 980         return vc_do_resize(vc->port.tty, vc, cols, rows);
 981 }
 982
 983 /**
 984  *      vt_resize               -       resize a VT
 985  *      @tty: tty to resize
 986  *      @ws: winsize attributes
 987  *
 988  *      Resize a virtual terminal. This is called by the tty layer as we
 989  *      register our own handler for resizing. The mutual helper does all
 990  *      the actual work.
 991  *
 992  *      Takes the console sem and the called methods then take the tty
 993  *      termios_mutex and the tty ctrl_lock in that order.
 994  */
 995 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 996 {
 997         struct vc_data *vc = tty->driver_data;
 998         int ret;
 999
1000         console_lock();
1001         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1002         console_unlock();
1003         return ret;
1004 }
1005
1006 void vc_deallocate(unsigned int currcons)
1007 {
1008         WARN_CONSOLE_UNLOCKED();
1009
1010         if (vc_cons_allocated(currcons)) {
1011                 struct vc_data *vc = vc_cons[currcons].d;
1012                 struct vt_notifier_param param = { .vc = vc };
1013
1014                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1015                 vcs_remove_sysfs(currcons);
1016                 vc->vc_sw->con_deinit(vc);
1017                 put_pid(vc->vt_pid);
1018                 module_put(vc->vc_sw->owner);
1019                 kfree(vc->vc_screenbuf);
1020                 if (currcons >= MIN_NR_CONSOLES)
1021                         kfree(vc);
1022                 vc_cons[currcons].d = NULL;
1023         }
1024 }
1025
1026 /*
1027  *      VT102 emulator
1028  */
1029
1030 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1031 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1032 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1033
1034 #define decarm          VC_REPEAT
1035 #define decckm          VC_CKMODE
1036 #define kbdapplic       VC_APPLIC
1037 #define lnm             VC_CRLF
1038
1039 /*
1040  * this is what the terminal answers to a ESC-Z or csi0c query.
1041  */
1042 #define VT100ID "\033[?1;2c"
1043 #define VT102ID "\033[?6c"
1044
1045 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1046                                        8,12,10,14, 9,13,11,15 };
1047
1048 /* the default colour table, for VGA+ colour systems */
1049 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1050     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1051 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1052     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1053 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1054     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1055
1056 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1057 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1058 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1059
1060 /*
1061  * gotoxy() must verify all boundaries, because the arguments
1062  * might also be negative. If the given position is out of
1063  * bounds, the cursor is placed at the nearest margin.
1064  */
1065 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1066 {
1067         int min_y, max_y;
1068
1069         if (new_x < 0)
1070                 vc->vc_x = 0;
1071         else {
1072                 if (new_x >= vc->vc_cols)
1073                         vc->vc_x = vc->vc_cols - 1;
1074                 else
1075                         vc->vc_x = new_x;
1076         }
1077
1078         if (vc->vc_decom) {
1079                 min_y = vc->vc_top;
1080                 max_y = vc->vc_bottom;
1081         } else {
1082                 min_y = 0;
1083                 max_y = vc->vc_rows;
1084         }
1085         if (new_y < min_y)
1086                 vc->vc_y = min_y;
1087         else if (new_y >= max_y)
1088                 vc->vc_y = max_y - 1;
1089         else
1090                 vc->vc_y = new_y;
1091         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1092         vc->vc_need_wrap = 0;
1093 }
1094
1095 /* for absolute user moves, when decom is set */
1096 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1097 {
1098         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1099 }
1100
1101 void scrollback(struct vc_data *vc, int lines)
1102 {
1103         if (!lines)
1104                 lines = vc->vc_rows / 2;
1105         scrolldelta(-lines);
1106 }
1107
1108 void scrollfront(struct vc_data *vc, int lines)
1109 {
1110         if (!lines)
1111                 lines = vc->vc_rows / 2;
1112         scrolldelta(lines);
1113 }
1114
1115 static void lf(struct vc_data *vc)
1116 {
1117         /* don't scroll if above bottom of scrolling region, or
1118          * if below scrolling region
1119          */
1120         if (vc->vc_y + 1 == vc->vc_bottom)
1121                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1122         else if (vc->vc_y < vc->vc_rows - 1) {
1123                 vc->vc_y++;
1124                 vc->vc_pos += vc->vc_size_row;
1125         }
1126         vc->vc_need_wrap = 0;
1127         notify_write(vc, '\n');
1128 }
1129
1130 static void ri(struct vc_data *vc)
1131 {
1132         /* don't scroll if below top of scrolling region, or
1133          * if above scrolling region
1134          */
1135         if (vc->vc_y == vc->vc_top)
1136                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1137         else if (vc->vc_y > 0) {
1138                 vc->vc_y--;
1139                 vc->vc_pos -= vc->vc_size_row;
1140         }
1141         vc->vc_need_wrap = 0;
1142 }
1143
1144 static inline void cr(struct vc_data *vc)
1145 {
1146         vc->vc_pos -= vc->vc_x << 1;
1147         vc->vc_need_wrap = vc->vc_x = 0;
1148         notify_write(vc, '\r');
1149 }
1150
1151 static inline void bs(struct vc_data *vc)
1152 {
1153         if (vc->vc_x) {
1154                 vc->vc_pos -= 2;
1155                 vc->vc_x--;
1156                 vc->vc_need_wrap = 0;
1157                 notify_write(vc, '\b');
1158         }
1159 }
1160
1161 static inline void del(struct vc_data *vc)
1162 {
1163         /* ignored */
1164 }
1165
1166 static void csi_J(struct vc_data *vc, int vpar)
1167 {
1168         unsigned int count;
1169         unsigned short * start;
1170
1171         switch (vpar) {
1172                 case 0: /* erase from cursor to end of display */
1173                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1174                         start = (unsigned short *)vc->vc_pos;
1175                         if (DO_UPDATE(vc)) {
1176                                 /* do in two stages */
1177                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1178                                               vc->vc_cols - vc->vc_x);
1179                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1180                                               vc->vc_rows - vc->vc_y - 1,
1181                                               vc->vc_cols);
1182                         }
1183                         break;
1184                 case 1: /* erase from start to cursor */
1185                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1186                         start = (unsigned short *)vc->vc_origin;
1187                         if (DO_UPDATE(vc)) {
1188                                 /* do in two stages */
1189                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1190                                               vc->vc_cols);
1191                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1192                                               vc->vc_x + 1);
1193                         }
1194                         break;
1195                 case 3: /* erase scroll-back buffer (and whole display) */
1196                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1197                                     vc->vc_screenbuf_size >> 1);
1198                         set_origin(vc);
1199                         if (CON_IS_VISIBLE(vc))
1200                                 update_screen(vc);
1201                         /* fall through */
1202                 case 2: /* erase whole display */
1203                         count = vc->vc_cols * vc->vc_rows;
1204                         start = (unsigned short *)vc->vc_origin;
1205                         if (DO_UPDATE(vc))
1206                                 vc->vc_sw->con_clear(vc, 0, 0,
1207                                               vc->vc_rows,
1208                                               vc->vc_cols);
1209                         break;
1210                 default:
1211                         return;
1212         }
1213         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1214         vc->vc_need_wrap = 0;
1215 }
1216
1217 static void csi_K(struct vc_data *vc, int vpar)
1218 {
1219         unsigned int count;
1220         unsigned short * start;
1221
1222         switch (vpar) {
1223                 case 0: /* erase from cursor to end of line */
1224                         count = vc->vc_cols - vc->vc_x;
1225                         start = (unsigned short *)vc->vc_pos;
1226                         if (DO_UPDATE(vc))
1227                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1228                                                      vc->vc_cols - vc->vc_x);
1229                         break;
1230                 case 1: /* erase from start of line to cursor */
1231                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1232                         count = vc->vc_x + 1;
1233                         if (DO_UPDATE(vc))
1234                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1235                                                      vc->vc_x + 1);
1236                         break;
1237                 case 2: /* erase whole line */
1238                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1239                         count = vc->vc_cols;
1240                         if (DO_UPDATE(vc))
1241                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1242                                               vc->vc_cols);
1243                         break;
1244                 default:
1245                         return;
1246         }
1247         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1248         vc->vc_need_wrap = 0;
1249 }
1250
1251 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1252 {                                         /* not vt100? */
1253         int count;
1254
1255         if (!vpar)
1256                 vpar++;
1257         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1258
1259         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1260         if (DO_UPDATE(vc))
1261                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1262         vc->vc_need_wrap = 0;
1263 }
1264
1265 static void default_attr(struct vc_data *vc)
1266 {
1267         vc->vc_intensity = 1;
1268         vc->vc_italic = 0;
1269         vc->vc_underline = 0;
1270         vc->vc_reverse = 0;
1271         vc->vc_blink = 0;
1272         vc->vc_color = vc->vc_def_color;
1273 }
1274
1275 /* console_lock is held */
1276 static void csi_m(struct vc_data *vc)
1277 {
1278         int i;
1279
1280         for (i = 0; i <= vc->vc_npar; i++)
1281                 switch (vc->vc_par[i]) {
1282                         case 0: /* all attributes off */
1283                                 default_attr(vc);
1284                                 break;
1285                         case 1:
1286                                 vc->vc_intensity = 2;
1287                                 break;
1288                         case 2:
1289                                 vc->vc_intensity = 0;
1290                                 break;
1291                         case 3:
1292                                 vc->vc_italic = 1;
1293                                 break;
1294                         case 4:
1295                                 vc->vc_underline = 1;
1296                                 break;
1297                         case 5:
1298                                 vc->vc_blink = 1;
1299                                 break;
1300                         case 7:
1301                                 vc->vc_reverse = 1;
1302                                 break;
1303                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1304                                   * Select primary font, don't display
1305                                   * control chars if defined, don't set
1306                                   * bit 8 on output.
1307                                   */
1308                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1309                                                 ? vc->vc_G0_charset
1310                                                 : vc->vc_G1_charset, vc);
1311                                 vc->vc_disp_ctrl = 0;
1312                                 vc->vc_toggle_meta = 0;
1313                                 break;
1314                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1315                                   * Select first alternate font, lets
1316                                   * chars < 32 be displayed as ROM chars.
1317                                   */
1318                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1319                                 vc->vc_disp_ctrl = 1;
1320                                 vc->vc_toggle_meta = 0;
1321                                 break;
1322                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1323                                   * Select second alternate font, toggle
1324                                   * high bit before displaying as ROM char.
1325                                   */
1326                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1327                                 vc->vc_disp_ctrl = 1;
1328                                 vc->vc_toggle_meta = 1;
1329                                 break;
1330                         case 21:
1331                         case 22:
1332                                 vc->vc_intensity = 1;
1333                                 break;
1334                         case 23:
1335                                 vc->vc_italic = 0;
1336                                 break;
1337                         case 24:
1338                                 vc->vc_underline = 0;
1339                                 break;
1340                         case 25:
1341                                 vc->vc_blink = 0;
1342                                 break;
1343                         case 27:
1344                                 vc->vc_reverse = 0;
1345                                 break;
1346                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1347                                   * Enables underscore, white foreground
1348                                   * with white underscore (Linux - use
1349                                   * default foreground).
1350                                   */
1351                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1352                                 vc->vc_underline = 1;
1353                                 break;
1354                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1355                                   * Disable underline option.
1356                                   * Reset colour to default? It did this
1357                                   * before...
1358                                   */
1359                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1360                                 vc->vc_underline = 0;
1361                                 break;
1362                         case 49:
1363                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1364                                 break;
1365                         default:
1366                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1367                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1368                                                 | (vc->vc_color & 0xf0);
1369                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1370                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1371                                                 | (vc->vc_color & 0x0f);
1372                                 break;
1373                 }
1374         update_attr(vc);
1375 }
1376
1377 static void respond_string(const char *p, struct tty_struct *tty)
1378 {
1379         while (*p) {
1380                 tty_insert_flip_char(tty, *p, 0);
1381                 p++;
1382         }
1383         con_schedule_flip(tty);
1384 }
1385
1386 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1387 {
1388         char buf[40];
1389
1390         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1391         respond_string(buf, tty);
1392 }
1393
1394 static inline void status_report(struct tty_struct *tty)
1395 {
1396         respond_string("\033[0n", tty); /* Terminal ok */
1397 }
1398
1399 static inline void respond_ID(struct tty_struct * tty)
1400 {
1401         respond_string(VT102ID, tty);
1402 }
1403
1404 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1405 {
1406         char buf[8];
1407
1408         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1409                 (char)('!' + mry));
1410         respond_string(buf, tty);
1411 }
1412
1413 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1414 int mouse_reporting(void)
1415 {
1416         return vc_cons[fg_console].d->vc_report_mouse;
1417 }
1418
1419 /* console_lock is held */
1420 static void set_mode(struct vc_data *vc, int on_off)
1421 {
1422         int i;
1423
1424         for (i = 0; i <= vc->vc_npar; i++)
1425                 if (vc->vc_ques) {
1426                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1427                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1428                                 if (on_off)
1429                                         set_kbd(vc, decckm);
1430                                 else
1431                                         clr_kbd(vc, decckm);
1432                                 break;
1433                         case 3: /* 80/132 mode switch unimplemented */
1434                                 vc->vc_deccolm = on_off;
1435 #if 0
1436                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1437                                 /* this alone does not suffice; some user mode
1438                                    utility has to change the hardware regs */
1439 #endif
1440                                 break;
1441                         case 5:                 /* Inverted screen on/off */
1442                                 if (vc->vc_decscnm != on_off) {
1443                                         vc->vc_decscnm = on_off;
1444                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1445                                         update_attr(vc);
1446                                 }
1447                                 break;
1448                         case 6:                 /* Origin relative/absolute */
1449                                 vc->vc_decom = on_off;
1450                                 gotoxay(vc, 0, 0);
1451                                 break;
1452                         case 7:                 /* Autowrap on/off */
1453                                 vc->vc_decawm = on_off;
1454                                 break;
1455                         case 8:                 /* Autorepeat on/off */
1456                                 if (on_off)
1457                                         set_kbd(vc, decarm);
1458                                 else
1459                                         clr_kbd(vc, decarm);
1460                                 break;
1461                         case 9:
1462                                 vc->vc_report_mouse = on_off ? 1 : 0;
1463                                 break;
1464                         case 25:                /* Cursor on/off */
1465                                 vc->vc_deccm = on_off;
1466                                 break;
1467                         case 1000:
1468                                 vc->vc_report_mouse = on_off ? 2 : 0;
1469                                 break;
1470                         }
1471                 } else {
1472                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1473                         case 3:                 /* Monitor (display ctrls) */
1474                                 vc->vc_disp_ctrl = on_off;
1475                                 break;
1476                         case 4:                 /* Insert Mode on/off */
1477                                 vc->vc_decim = on_off;
1478                                 break;
1479                         case 20:                /* Lf, Enter == CrLf/Lf */
1480                                 if (on_off)
1481                                         set_kbd(vc, lnm);
1482                                 else
1483                                         clr_kbd(vc, lnm);
1484                                 break;
1485                         }
1486                 }
1487 }
1488
1489 /* console_lock is held */
1490 static void setterm_command(struct vc_data *vc)
1491 {
1492         switch(vc->vc_par[0]) {
1493                 case 1: /* set color for underline mode */
1494                         if (vc->vc_can_do_color &&
1495                                         vc->vc_par[1] < 16) {
1496                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1497                                 if (vc->vc_underline)
1498                                         update_attr(vc);
1499                         }
1500                         break;
1501                 case 2: /* set color for half intensity mode */
1502                         if (vc->vc_can_do_color &&
1503                                         vc->vc_par[1] < 16) {
1504                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1505                                 if (vc->vc_intensity == 0)
1506                                         update_attr(vc);
1507                         }
1508                         break;
1509                 case 8: /* store colors as defaults */
1510                         vc->vc_def_color = vc->vc_attr;
1511                         if (vc->vc_hi_font_mask == 0x100)
1512                                 vc->vc_def_color >>= 1;
1513                         default_attr(vc);
1514                         update_attr(vc);
1515                         break;
1516                 case 9: /* set blanking interval */
1517                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1518                         poke_blanked_console();
1519                         break;
1520                 case 10: /* set bell frequency in Hz */
1521                         if (vc->vc_npar >= 1)
1522                                 vc->vc_bell_pitch = vc->vc_par[1];
1523                         else
1524                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1525                         break;
1526                 case 11: /* set bell duration in msec */
1527                         if (vc->vc_npar >= 1)
1528                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1529                                         vc->vc_par[1] * HZ / 1000 : 0;
1530                         else
1531                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1532                         break;
1533                 case 12: /* bring specified console to the front */
1534                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1535                                 set_console(vc->vc_par[1] - 1);
1536                         break;
1537                 case 13: /* unblank the screen */
1538                         poke_blanked_console();
1539                         break;
1540                 case 14: /* set vesa powerdown interval */
1541                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1542                         break;
1543                 case 15: /* activate the previous console */
1544                         set_console(last_console);
1545                         break;
1546         }
1547 }
1548
1549 /* console_lock is held */
1550 static void csi_at(struct vc_data *vc, unsigned int nr)
1551 {
1552         if (nr > vc->vc_cols - vc->vc_x)
1553                 nr = vc->vc_cols - vc->vc_x;
1554         else if (!nr)
1555                 nr = 1;
1556         insert_char(vc, nr);
1557 }
1558
1559 /* console_lock is held */
1560 static void csi_L(struct vc_data *vc, unsigned int nr)
1561 {
1562         if (nr > vc->vc_rows - vc->vc_y)
1563                 nr = vc->vc_rows - vc->vc_y;
1564         else if (!nr)
1565                 nr = 1;
1566         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1567         vc->vc_need_wrap = 0;
1568 }
1569
1570 /* console_lock is held */
1571 static void csi_P(struct vc_data *vc, unsigned int nr)
1572 {
1573         if (nr > vc->vc_cols - vc->vc_x)
1574                 nr = vc->vc_cols - vc->vc_x;
1575         else if (!nr)
1576                 nr = 1;
1577         delete_char(vc, nr);
1578 }
1579
1580 /* console_lock is held */
1581 static void csi_M(struct vc_data *vc, unsigned int nr)
1582 {
1583         if (nr > vc->vc_rows - vc->vc_y)
1584                 nr = vc->vc_rows - vc->vc_y;
1585         else if (!nr)
1586                 nr=1;
1587         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1588         vc->vc_need_wrap = 0;
1589 }
1590
1591 /* console_lock is held (except via vc_init->reset_terminal */
1592 static void save_cur(struct vc_data *vc)
1593 {
1594         vc->vc_saved_x          = vc->vc_x;
1595         vc->vc_saved_y          = vc->vc_y;
1596         vc->vc_s_intensity      = vc->vc_intensity;
1597         vc->vc_s_italic         = vc->vc_italic;
1598         vc->vc_s_underline      = vc->vc_underline;
1599         vc->vc_s_blink          = vc->vc_blink;
1600         vc->vc_s_reverse        = vc->vc_reverse;
1601         vc->vc_s_charset        = vc->vc_charset;
1602         vc->vc_s_color          = vc->vc_color;
1603         vc->vc_saved_G0         = vc->vc_G0_charset;
1604         vc->vc_saved_G1         = vc->vc_G1_charset;
1605 }
1606
1607 /* console_lock is held */
1608 static void restore_cur(struct vc_data *vc)
1609 {
1610         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1611         vc->vc_intensity        = vc->vc_s_intensity;
1612         vc->vc_italic           = vc->vc_s_italic;
1613         vc->vc_underline        = vc->vc_s_underline;
1614         vc->vc_blink            = vc->vc_s_blink;
1615         vc->vc_reverse          = vc->vc_s_reverse;
1616         vc->vc_charset          = vc->vc_s_charset;
1617         vc->vc_color            = vc->vc_s_color;
1618         vc->vc_G0_charset       = vc->vc_saved_G0;
1619         vc->vc_G1_charset       = vc->vc_saved_G1;
1620         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1621         update_attr(vc);
1622         vc->vc_need_wrap = 0;
1623 }
1624
1625 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1626         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1627         ESpalette };
1628
1629 /* console_lock is held (except via vc_init()) */
1630 static void reset_terminal(struct vc_data *vc, int do_clear)
1631 {
1632         vc->vc_top              = 0;
1633         vc->vc_bottom           = vc->vc_rows;
1634         vc->vc_state            = ESnormal;
1635         vc->vc_ques             = 0;
1636         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1637         vc->vc_G0_charset       = LAT1_MAP;
1638         vc->vc_G1_charset       = GRAF_MAP;
1639         vc->vc_charset          = 0;
1640         vc->vc_need_wrap        = 0;
1641         vc->vc_report_mouse     = 0;
1642         vc->vc_utf              = default_utf8;
1643         vc->vc_utf_count        = 0;
1644
1645         vc->vc_disp_ctrl        = 0;
1646         vc->vc_toggle_meta      = 0;
1647
1648         vc->vc_decscnm          = 0;
1649         vc->vc_decom            = 0;
1650         vc->vc_decawm           = 1;
1651         vc->vc_deccm            = global_cursor_default;
1652         vc->vc_decim            = 0;
1653
1654         vt_reset_keyboard(vc->vc_num);
1655
1656         vc->vc_cursor_type = cur_default;
1657         vc->vc_complement_mask = vc->vc_s_complement_mask;
1658
1659         default_attr(vc);
1660         update_attr(vc);
1661
1662         vc->vc_tab_stop[0]      = 0x01010100;
1663         vc->vc_tab_stop[1]      =
1664         vc->vc_tab_stop[2]      =
1665         vc->vc_tab_stop[3]      =
1666         vc->vc_tab_stop[4]      =
1667         vc->vc_tab_stop[5]      =
1668         vc->vc_tab_stop[6]      =
1669         vc->vc_tab_stop[7]      = 0x01010101;
1670
1671         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1672         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1673
1674         gotoxy(vc, 0, 0);
1675         save_cur(vc);
1676         if (do_clear)
1677             csi_J(vc, 2);
1678 }
1679
1680 /* console_lock is held */
1681 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1682 {
1683         /*
1684          *  Control characters can be used in the _middle_
1685          *  of an escape sequence.
1686          */
1687         switch (c) {
1688         case 0:
1689                 return;
1690         case 7:
1691                 if (vc->vc_bell_duration)
1692                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1693                 return;
1694         case 8:
1695                 bs(vc);
1696                 return;
1697         case 9:
1698                 vc->vc_pos -= (vc->vc_x << 1);
1699                 while (vc->vc_x < vc->vc_cols - 1) {
1700                         vc->vc_x++;
1701                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1702                                 break;
1703                 }
1704                 vc->vc_pos += (vc->vc_x << 1);
1705                 notify_write(vc, '\t');
1706                 return;
1707         case 10: case 11: case 12:
1708                 lf(vc);
1709                 if (!is_kbd(vc, lnm))
1710                         return;
1711         case 13:
1712                 cr(vc);
1713                 return;
1714         case 14:
1715                 vc->vc_charset = 1;
1716                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1717                 vc->vc_disp_ctrl = 1;
1718                 return;
1719         case 15:
1720                 vc->vc_charset = 0;
1721                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1722                 vc->vc_disp_ctrl = 0;
1723                 return;
1724         case 24: case 26:
1725                 vc->vc_state = ESnormal;
1726                 return;
1727         case 27:
1728                 vc->vc_state = ESesc;
1729                 return;
1730         case 127:
1731                 del(vc);
1732                 return;
1733         case 128+27:
1734                 vc->vc_state = ESsquare;
1735                 return;
1736         }
1737         switch(vc->vc_state) {
1738         case ESesc:
1739                 vc->vc_state = ESnormal;
1740                 switch (c) {
1741                 case '[':
1742                         vc->vc_state = ESsquare;
1743                         return;
1744                 case ']':
1745                         vc->vc_state = ESnonstd;
1746                         return;
1747                 case '%':
1748                         vc->vc_state = ESpercent;
1749                         return;
1750                 case 'E':
1751                         cr(vc);
1752                         lf(vc);
1753                         return;
1754                 case 'M':
1755                         ri(vc);
1756                         return;
1757                 case 'D':
1758                         lf(vc);
1759                         return;
1760                 case 'H':
1761                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1762                         return;
1763                 case 'Z':
1764                         respond_ID(tty);
1765                         return;
1766                 case '7':
1767                         save_cur(vc);
1768                         return;
1769                 case '8':
1770                         restore_cur(vc);
1771                         return;
1772                 case '(':
1773                         vc->vc_state = ESsetG0;
1774                         return;
1775                 case ')':
1776                         vc->vc_state = ESsetG1;
1777                         return;
1778                 case '#':
1779                         vc->vc_state = EShash;
1780                         return;
1781                 case 'c':
1782                         reset_terminal(vc, 1);
1783                         return;
1784                 case '>':  /* Numeric keypad */
1785                         clr_kbd(vc, kbdapplic);
1786                         return;
1787                 case '=':  /* Appl. keypad */
1788                         set_kbd(vc, kbdapplic);
1789                         return;
1790                 }
1791                 return;
1792         case ESnonstd:
1793                 if (c=='P') {   /* palette escape sequence */
1794                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1795                                 vc->vc_par[vc->vc_npar] = 0;
1796                         vc->vc_npar = 0;
1797                         vc->vc_state = ESpalette;
1798                         return;
1799                 } else if (c=='R') {   /* reset palette */
1800                         reset_palette(vc);
1801                         vc->vc_state = ESnormal;
1802                 } else
1803                         vc->vc_state = ESnormal;
1804                 return;
1805         case ESpalette:
1806                 if (isxdigit(c)) {
1807                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1808                         if (vc->vc_npar == 7) {
1809                                 int i = vc->vc_par[0] * 3, j = 1;
1810                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1811                                 vc->vc_palette[i++] += vc->vc_par[j++];
1812                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1813                                 vc->vc_palette[i++] += vc->vc_par[j++];
1814                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1815                                 vc->vc_palette[i] += vc->vc_par[j];
1816                                 set_palette(vc);
1817                                 vc->vc_state = ESnormal;
1818                         }
1819                 } else
1820                         vc->vc_state = ESnormal;
1821                 return;
1822         case ESsquare:
1823                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1824                         vc->vc_par[vc->vc_npar] = 0;
1825                 vc->vc_npar = 0;
1826                 vc->vc_state = ESgetpars;
1827                 if (c == '[') { /* Function key */
1828                         vc->vc_state=ESfunckey;
1829                         return;
1830                 }
1831                 vc->vc_ques = (c == '?');
1832                 if (vc->vc_ques)
1833                         return;
1834         case ESgetpars:
1835                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1836                         vc->vc_npar++;
1837                         return;
1838                 } else if (c>='0' && c<='9') {
1839                         vc->vc_par[vc->vc_npar] *= 10;
1840                         vc->vc_par[vc->vc_npar] += c - '0';
1841                         return;
1842                 } else
1843                         vc->vc_state = ESgotpars;
1844         case ESgotpars:
1845                 vc->vc_state = ESnormal;
1846                 switch(c) {
1847                 case 'h':
1848                         set_mode(vc, 1);
1849                         return;
1850                 case 'l':
1851                         set_mode(vc, 0);
1852                         return;
1853                 case 'c':
1854                         if (vc->vc_ques) {
1855                                 if (vc->vc_par[0])
1856                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1857                                 else
1858                                         vc->vc_cursor_type = cur_default;
1859                                 return;
1860                         }
1861                         break;
1862                 case 'm':
1863                         if (vc->vc_ques) {
1864                                 clear_selection();
1865                                 if (vc->vc_par[0])
1866                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1867                                 else
1868                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1869                                 return;
1870                         }
1871                         break;
1872                 case 'n':
1873                         if (!vc->vc_ques) {
1874                                 if (vc->vc_par[0] == 5)
1875                                         status_report(tty);
1876                                 else if (vc->vc_par[0] == 6)
1877                                         cursor_report(vc, tty);
1878                         }
1879                         return;
1880                 }
1881                 if (vc->vc_ques) {
1882                         vc->vc_ques = 0;
1883                         return;
1884                 }
1885                 switch(c) {
1886                 case 'G': case '`':
1887                         if (vc->vc_par[0])
1888                                 vc->vc_par[0]--;
1889                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1890                         return;
1891                 case 'A':
1892                         if (!vc->vc_par[0])
1893                                 vc->vc_par[0]++;
1894                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1895                         return;
1896                 case 'B': case 'e':
1897                         if (!vc->vc_par[0])
1898                                 vc->vc_par[0]++;
1899                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1900                         return;
1901                 case 'C': case 'a':
1902                         if (!vc->vc_par[0])
1903                                 vc->vc_par[0]++;
1904                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1905                         return;
1906                 case 'D':
1907                         if (!vc->vc_par[0])
1908                                 vc->vc_par[0]++;
1909                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1910                         return;
1911                 case 'E':
1912                         if (!vc->vc_par[0])
1913                                 vc->vc_par[0]++;
1914                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1915                         return;
1916                 case 'F':
1917                         if (!vc->vc_par[0])
1918                                 vc->vc_par[0]++;
1919                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1920                         return;
1921                 case 'd':
1922                         if (vc->vc_par[0])
1923                                 vc->vc_par[0]--;
1924                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1925                         return;
1926                 case 'H': case 'f':
1927                         if (vc->vc_par[0])
1928                                 vc->vc_par[0]--;
1929                         if (vc->vc_par[1])
1930                                 vc->vc_par[1]--;
1931                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1932                         return;
1933                 case 'J':
1934                         csi_J(vc, vc->vc_par[0]);
1935                         return;
1936                 case 'K':
1937                         csi_K(vc, vc->vc_par[0]);
1938                         return;
1939                 case 'L':
1940                         csi_L(vc, vc->vc_par[0]);
1941                         return;
1942                 case 'M':
1943                         csi_M(vc, vc->vc_par[0]);
1944                         return;
1945                 case 'P':
1946                         csi_P(vc, vc->vc_par[0]);
1947                         return;
1948                 case 'c':
1949                         if (!vc->vc_par[0])
1950                                 respond_ID(tty);
1951                         return;
1952                 case 'g':
1953                         if (!vc->vc_par[0])
1954                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1955                         else if (vc->vc_par[0] == 3) {
1956                                 vc->vc_tab_stop[0] =
1957                                         vc->vc_tab_stop[1] =
1958                                         vc->vc_tab_stop[2] =
1959                                         vc->vc_tab_stop[3] =
1960                                         vc->vc_tab_stop[4] =
1961                                         vc->vc_tab_stop[5] =
1962                                         vc->vc_tab_stop[6] =
1963                                         vc->vc_tab_stop[7] = 0;
1964                         }
1965                         return;
1966                 case 'm':
1967                         csi_m(vc);
1968                         return;
1969                 case 'q': /* DECLL - but only 3 leds */
1970                         /* map 0,1,2,3 to 0,1,2,4 */
1971                         if (vc->vc_par[0] < 4)
1972                                 vt_set_led_state(vc->vc_num,
1973                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1974                         return;
1975                 case 'r':
1976                         if (!vc->vc_par[0])
1977                                 vc->vc_par[0]++;
1978                         if (!vc->vc_par[1])
1979                                 vc->vc_par[1] = vc->vc_rows;
1980                         /* Minimum allowed region is 2 lines */
1981                         if (vc->vc_par[0] < vc->vc_par[1] &&
1982                             vc->vc_par[1] <= vc->vc_rows) {
1983                                 vc->vc_top = vc->vc_par[0] - 1;
1984                                 vc->vc_bottom = vc->vc_par[1];
1985                                 gotoxay(vc, 0, 0);
1986                         }
1987                         return;
1988                 case 's':
1989                         save_cur(vc);
1990                         return;
1991                 case 'u':
1992                         restore_cur(vc);
1993                         return;
1994                 case 'X':
1995                         csi_X(vc, vc->vc_par[0]);
1996                         return;
1997                 case '@':
1998                         csi_at(vc, vc->vc_par[0]);
1999                         return;
2000                 case ']': /* setterm functions */
2001                         setterm_command(vc);
2002                         return;
2003                 }
2004                 return;
2005         case ESpercent:
2006                 vc->vc_state = ESnormal;
2007                 switch (c) {
2008                 case '@':  /* defined in ISO 2022 */
2009                         vc->vc_utf = 0;
2010                         return;
2011                 case 'G':  /* prelim official escape code */
2012                 case '8':  /* retained for compatibility */
2013                         vc->vc_utf = 1;
2014                         return;
2015                 }
2016                 return;
2017         case ESfunckey:
2018                 vc->vc_state = ESnormal;
2019                 return;
2020         case EShash:
2021                 vc->vc_state = ESnormal;
2022                 if (c == '8') {
2023                         /* DEC screen alignment test. kludge :-) */
2024                         vc->vc_video_erase_char =
2025                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2026                         csi_J(vc, 2);
2027                         vc->vc_video_erase_char =
2028                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2029                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2030                 }
2031                 return;
2032         case ESsetG0:
2033                 if (c == '0')
2034                         vc->vc_G0_charset = GRAF_MAP;
2035                 else if (c == 'B')
2036                         vc->vc_G0_charset = LAT1_MAP;
2037                 else if (c == 'U')
2038                         vc->vc_G0_charset = IBMPC_MAP;
2039                 else if (c == 'K')
2040                         vc->vc_G0_charset = USER_MAP;
2041                 if (vc->vc_charset == 0)
2042                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2043                 vc->vc_state = ESnormal;
2044                 return;
2045         case ESsetG1:
2046                 if (c == '0')
2047                         vc->vc_G1_charset = GRAF_MAP;
2048                 else if (c == 'B')
2049                         vc->vc_G1_charset = LAT1_MAP;
2050                 else if (c == 'U')
2051                         vc->vc_G1_charset = IBMPC_MAP;
2052                 else if (c == 'K')
2053                         vc->vc_G1_charset = USER_MAP;
2054                 if (vc->vc_charset == 1)
2055                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2056                 vc->vc_state = ESnormal;
2057                 return;
2058         default:
2059                 vc->vc_state = ESnormal;
2060         }
2061 }
2062
2063 /* is_double_width() is based on the wcwidth() implementation by
2064  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2065  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2066  */
2067 struct interval {
2068         uint32_t first;
2069         uint32_t last;
2070 };
2071
2072 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2073 {
2074         int min = 0;
2075         int mid;
2076
2077         if (ucs < table[0].first || ucs > table[max].last)
2078                 return 0;
2079         while (max >= min) {
2080                 mid = (min + max) / 2;
2081                 if (ucs > table[mid].last)
2082                         min = mid + 1;
2083                 else if (ucs < table[mid].first)
2084                         max = mid - 1;
2085                 else
2086                         return 1;
2087         }
2088         return 0;
2089 }
2090
2091 static int is_double_width(uint32_t ucs)
2092 {
2093         static const struct interval double_width[] = {
2094                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2095                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2096                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2097                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2098         };
2099         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2100 }
2101
2102 /* acquires console_lock */
2103 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2104 {
2105 #ifdef VT_BUF_VRAM_ONLY
2106 #define FLUSH do { } while(0);
2107 #else
2108 #define FLUSH if (draw_x >= 0) { \
2109         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2110         draw_x = -1; \
2111         }
2112 #endif
2113
2114         int c, tc, ok, n = 0, draw_x = -1;
2115         unsigned int currcons;
2116         unsigned long draw_from = 0, draw_to = 0;
2117         struct vc_data *vc;
2118         unsigned char vc_attr;
2119         struct vt_notifier_param param;
2120         uint8_t rescan;
2121         uint8_t inverse;
2122         uint8_t width;
2123         u16 himask, charmask;
2124
2125         if (in_interrupt())
2126                 return count;
2127
2128         might_sleep();
2129
2130         console_lock();
2131         vc = tty->driver_data;
2132         if (vc == NULL) {
2133                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2134                 console_unlock();
2135                 return 0;
2136         }
2137
2138         currcons = vc->vc_num;
2139         if (!vc_cons_allocated(currcons)) {
2140                 /* could this happen? */
2141                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2142                 console_unlock();
2143                 return 0;
2144         }
2145
2146         himask = vc->vc_hi_font_mask;
2147         charmask = himask ? 0x1ff : 0xff;
2148
2149         /* undraw cursor first */
2150         if (IS_FG(vc))
2151                 hide_cursor(vc);
2152
2153         param.vc = vc;
2154
2155         while (!tty->stopped && count) {
2156                 int orig = *buf;
2157                 c = orig;
2158                 buf++;
2159                 n++;
2160                 count--;
2161                 rescan = 0;
2162                 inverse = 0;
2163                 width = 1;
2164
2165                 /* Do no translation at all in control states */
2166                 if (vc->vc_state != ESnormal) {
2167                         tc = c;
2168                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2169                     /* Combine UTF-8 into Unicode in vc_utf_char.
2170                      * vc_utf_count is the number of continuation bytes still
2171                      * expected to arrive.
2172                      * vc_npar is the number of continuation bytes arrived so
2173                      * far
2174                      */
2175 rescan_last_byte:
2176                     if ((c & 0xc0) == 0x80) {
2177                         /* Continuation byte received */
2178                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2179                         if (vc->vc_utf_count) {
2180                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2181                             vc->vc_npar++;
2182                             if (--vc->vc_utf_count) {
2183                                 /* Still need some bytes */
2184                                 continue;
2185                             }
2186                             /* Got a whole character */
2187                             c = vc->vc_utf_char;
2188                             /* Reject overlong sequences */
2189                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2190                                         c > utf8_length_changes[vc->vc_npar])
2191                                 c = 0xfffd;
2192                         } else {
2193                             /* Unexpected continuation byte */
2194                             vc->vc_utf_count = 0;
2195                             c = 0xfffd;
2196                         }
2197                     } else {
2198                         /* Single ASCII byte or first byte of a sequence received */
2199                         if (vc->vc_utf_count) {
2200                             /* Continuation byte expected */
2201                             rescan = 1;
2202                             vc->vc_utf_count = 0;
2203                             c = 0xfffd;
2204                         } else if (c > 0x7f) {
2205                             /* First byte of a multibyte sequence received */
2206                             vc->vc_npar = 0;
2207                             if ((c & 0xe0) == 0xc0) {
2208                                 vc->vc_utf_count = 1;
2209                                 vc->vc_utf_char = (c & 0x1f);
2210                             } else if ((c & 0xf0) == 0xe0) {
2211                                 vc->vc_utf_count = 2;
2212                                 vc->vc_utf_char = (c & 0x0f);
2213                             } else if ((c & 0xf8) == 0xf0) {
2214                                 vc->vc_utf_count = 3;
2215                                 vc->vc_utf_char = (c & 0x07);
2216                             } else if ((c & 0xfc) == 0xf8) {
2217                                 vc->vc_utf_count = 4;
2218                                 vc->vc_utf_char = (c & 0x03);
2219                             } else if ((c & 0xfe) == 0xfc) {
2220                                 vc->vc_utf_count = 5;
2221                                 vc->vc_utf_char = (c & 0x01);
2222                             } else {
2223                                 /* 254 and 255 are invalid */
2224                                 c = 0xfffd;
2225                             }
2226                             if (vc->vc_utf_count) {
2227                                 /* Still need some bytes */
2228                                 continue;
2229                             }
2230                         }
2231                         /* Nothing to do if an ASCII byte was received */
2232                     }
2233                     /* End of UTF-8 decoding. */
2234                     /* c is the received character, or U+FFFD for invalid sequences. */
2235                     /* Replace invalid Unicode code points with U+FFFD too */
2236                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2237                         c = 0xfffd;
2238                     tc = c;
2239                 } else {        /* no utf or alternate charset mode */
2240                     tc = vc_translate(vc, c);
2241                 }
2242
2243                 param.c = tc;
2244                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2245                                         &param) == NOTIFY_STOP)
2246                         continue;
2247
2248                 /* If the original code was a control character we
2249                  * only allow a glyph to be displayed if the code is
2250                  * not normally used (such as for cursor movement) or
2251                  * if the disp_ctrl mode has been explicitly enabled.
2252                  * Certain characters (as given by the CTRL_ALWAYS
2253                  * bitmap) are always displayed as control characters,
2254                  * as the console would be pretty useless without
2255                  * them; to display an arbitrary font position use the
2256                  * direct-to-font zone in UTF-8 mode.
2257                  */
2258                 ok = tc && (c >= 32 ||
2259                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2260                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2261                         && (c != 127 || vc->vc_disp_ctrl)
2262                         && (c != 128+27);
2263
2264                 if (vc->vc_state == ESnormal && ok) {
2265                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2266                                 if (is_double_width(c))
2267                                         width = 2;
2268                         }
2269                         /* Now try to find out how to display it */
2270                         tc = conv_uni_to_pc(vc, tc);
2271                         if (tc & ~charmask) {
2272                                 if (tc == -1 || tc == -2) {
2273                                     continue; /* nothing to display */
2274                                 }
2275                                 /* Glyph not found */
2276                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2277                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2278                                        This would make absolutely no sense with Unicode in mind,
2279                                        but do this for ASCII characters since a font may lack
2280                                        Unicode mapping info and we don't want to end up with
2281                                        having question marks only. */
2282                                     tc = c;
2283                                 } else {
2284                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2285                                     tc = conv_uni_to_pc(vc, 0xfffd);
2286                                     if (tc < 0) {
2287                                         inverse = 1;
2288                                         tc = conv_uni_to_pc(vc, '?');
2289                                         if (tc < 0) tc = '?';
2290                                     }
2291                                 }
2292                         }
2293
2294                         if (!inverse) {
2295                                 vc_attr = vc->vc_attr;
2296                         } else {
2297                                 /* invert vc_attr */
2298                                 if (!vc->vc_can_do_color) {
2299                                         vc_attr = (vc->vc_attr) ^ 0x08;
2300                                 } else if (vc->vc_hi_font_mask == 0x100) {
2301                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2302                                 } else {
2303                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2304                                 }
2305                                 FLUSH
2306                         }
2307
2308                         while (1) {
2309                                 if (vc->vc_need_wrap || vc->vc_decim)
2310                                         FLUSH
2311                                 if (vc->vc_need_wrap) {
2312                                         cr(vc);
2313                                         lf(vc);
2314                                 }
2315                                 if (vc->vc_decim)
2316                                         insert_char(vc, 1);
2317                                 scr_writew(himask ?
2318                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2319                                              (vc_attr << 8) + tc,
2320                                            (u16 *) vc->vc_pos);
2321                                 if (DO_UPDATE(vc) && draw_x < 0) {
2322                                         draw_x = vc->vc_x;
2323                                         draw_from = vc->vc_pos;
2324                                 }
2325                                 if (vc->vc_x == vc->vc_cols - 1) {
2326                                         vc->vc_need_wrap = vc->vc_decawm;
2327                                         draw_to = vc->vc_pos + 2;
2328                                 } else {
2329                                         vc->vc_x++;
2330                                         draw_to = (vc->vc_pos += 2);
2331                                 }
2332
2333                                 if (!--width) break;
2334
2335                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2336                                 if (tc < 0) tc = ' ';
2337                         }
2338                         notify_write(vc, c);
2339
2340                         if (inverse) {
2341                                 FLUSH
2342                         }
2343
2344                         if (rescan) {
2345                                 rescan = 0;
2346                                 inverse = 0;
2347                                 width = 1;
2348                                 c = orig;
2349                                 goto rescan_last_byte;
2350                         }
2351                         continue;
2352                 }
2353                 FLUSH
2354                 do_con_trol(tty, vc, orig);
2355         }
2356         FLUSH
2357         console_conditional_schedule();
2358         console_unlock();
2359         notify_update(vc);
2360         return n;
2361 #undef FLUSH
2362 }
2363
2364 /*
2365  * This is the console switching callback.
2366  *
2367  * Doing console switching in a process context allows
2368  * us to do the switches asynchronously (needed when we want
2369  * to switch due to a keyboard interrupt).  Synchronization
2370  * with other console code and prevention of re-entrancy is
2371  * ensured with console_lock.
2372  */
2373 static void console_callback(struct work_struct *ignored)
2374 {
2375         console_lock();
2376
2377         if (want_console >= 0) {
2378                 if (want_console != fg_console &&
2379                     vc_cons_allocated(want_console)) {
2380                         hide_cursor(vc_cons[fg_console].d);
2381                         change_console(vc_cons[want_console].d);
2382                         /* we only changed when the console had already
2383                            been allocated - a new console is not created
2384                            in an interrupt routine */
2385                 }
2386                 want_console = -1;
2387         }
2388         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2389                 do_poke_blanked_console = 0;
2390                 poke_blanked_console();
2391         }
2392         if (scrollback_delta) {
2393                 struct vc_data *vc = vc_cons[fg_console].d;
2394                 clear_selection();
2395                 if (vc->vc_mode == KD_TEXT)
2396                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2397                 scrollback_delta = 0;
2398         }
2399         if (blank_timer_expired) {
2400                 do_blank_screen(0);
2401                 blank_timer_expired = 0;
2402         }
2403         notify_update(vc_cons[fg_console].d);
2404
2405         console_unlock();
2406 }
2407
2408 int set_console(int nr)
2409 {
2410         struct vc_data *vc = vc_cons[fg_console].d;
2411
2412         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2413                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2414
2415                 /*
2416                  * Console switch will fail in console_callback() or
2417                  * change_console() so there is no point scheduling
2418                  * the callback
2419                  *
2420                  * Existing set_console() users don't check the return
2421                  * value so this shouldn't break anything
2422                  */
2423                 return -EINVAL;
2424         }
2425
2426         want_console = nr;
2427         schedule_console_callback();
2428
2429         return 0;
2430 }
2431
2432 struct tty_driver *console_driver;
2433
2434 #ifdef CONFIG_VT_CONSOLE
2435
2436 /**
2437  * vt_kmsg_redirect() - Sets/gets the kernel message console
2438  * @new:        The new virtual terminal number or -1 if the console should stay
2439  *              unchanged
2440  *
2441  * By default, the kernel messages are always printed on the current virtual
2442  * console. However, the user may modify that default with the
2443  * TIOCL_SETKMSGREDIRECT ioctl call.
2444  *
2445  * This function sets the kernel message console to be @new. It returns the old
2446  * virtual console number. The virtual terminal number 0 (both as parameter and
2447  * return value) means no redirection (i.e. always printed on the currently
2448  * active console).
2449  *
2450  * The parameter -1 means that only the current console is returned, but the
2451  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2452  * case to make the code more understandable.
2453  *
2454  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2455  * the parameter and always returns 0.
2456  */
2457 int vt_kmsg_redirect(int new)
2458 {
2459         static int kmsg_con;
2460
2461         if (new != -1)
2462                 return xchg(&kmsg_con, new);
2463         else
2464                 return kmsg_con;
2465 }
2466
2467 /*
2468  *      Console on virtual terminal
2469  *
2470  * The console must be locked when we get here.
2471  */
2472
2473 static void vt_console_print(struct console *co, const char *b, unsigned count)
2474 {
2475         struct vc_data *vc = vc_cons[fg_console].d;
2476         unsigned char c;
2477         static DEFINE_SPINLOCK(printing_lock);
2478         const ushort *start;
2479         ushort cnt = 0;
2480         ushort myx;
2481         int kmsg_console;
2482
2483         /* console busy or not yet initialized */
2484         if (!printable)
2485                 return;
2486         if (!spin_trylock(&printing_lock))
2487                 return;
2488
2489         kmsg_console = vt_get_kmsg_redirect();
2490         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2491                 vc = vc_cons[kmsg_console - 1].d;
2492
2493         /* read `x' only after setting currcons properly (otherwise
2494            the `x' macro will read the x of the foreground console). */
2495         myx = vc->vc_x;
2496
2497         if (!vc_cons_allocated(fg_console)) {
2498                 /* impossible */
2499                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2500                 goto quit;
2501         }
2502
2503         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2504                 goto quit;
2505
2506         /* undraw cursor first */
2507         if (IS_FG(vc))
2508                 hide_cursor(vc);
2509
2510         start = (ushort *)vc->vc_pos;
2511
2512         /* Contrived structure to try to emulate original need_wrap behaviour
2513          * Problems caused when we have need_wrap set on '\n' character */
2514         while (count--) {
2515                 c = *b++;
2516                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2517                         if (cnt > 0) {
2518                                 if (CON_IS_VISIBLE(vc))
2519                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2520                                 vc->vc_x += cnt;
2521                                 if (vc->vc_need_wrap)
2522                                         vc->vc_x--;
2523                                 cnt = 0;
2524                         }
2525                         if (c == 8) {           /* backspace */
2526                                 bs(vc);
2527                                 start = (ushort *)vc->vc_pos;
2528                                 myx = vc->vc_x;
2529                                 continue;
2530                         }
2531                         if (c != 13)
2532                                 lf(vc);
2533                         cr(vc);
2534                         start = (ushort *)vc->vc_pos;
2535                         myx = vc->vc_x;
2536                         if (c == 10 || c == 13)
2537                                 continue;
2538                 }
2539                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2540                 notify_write(vc, c);
2541                 cnt++;
2542                 if (myx == vc->vc_cols - 1) {
2543                         vc->vc_need_wrap = 1;
2544                         continue;
2545                 }
2546                 vc->vc_pos += 2;
2547                 myx++;
2548         }
2549         if (cnt > 0) {
2550                 if (CON_IS_VISIBLE(vc))
2551                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2552                 vc->vc_x += cnt;
2553                 if (vc->vc_x == vc->vc_cols) {
2554                         vc->vc_x--;
2555                         vc->vc_need_wrap = 1;
2556                 }
2557         }
2558         set_cursor(vc);
2559         notify_update(vc);
2560
2561 quit:
2562         spin_unlock(&printing_lock);
2563 }
2564
2565 static struct tty_driver *vt_console_device(struct console *c, int *index)
2566 {
2567         *index = c->index ? c->index-1 : fg_console;
2568         return console_driver;
2569 }
2570
2571 static struct console vt_console_driver = {
2572         .name           = "tty",
2573         .write          = vt_console_print,
2574         .device         = vt_console_device,
2575         .unblank        = unblank_screen,
2576         .flags          = CON_PRINTBUFFER,
2577         .index          = -1,
2578 };
2579 #endif
2580
2581 /*
2582  *      Handling of Linux-specific VC ioctls
2583  */
2584
2585 /*
2586  * Generally a bit racy with respect to console_lock();.
2587  *
2588  * There are some functions which don't need it.
2589  *
2590  * There are some functions which can sleep for arbitrary periods
2591  * (paste_selection) but we don't need the lock there anyway.
2592  *
2593  * set_selection has locking, and definitely needs it
2594  */
2595
2596 int tioclinux(struct tty_struct *tty, unsigned long arg)
2597 {
2598         char type, data;
2599         char __user *p = (char __user *)arg;
2600         int lines;
2601         int ret;
2602
2603         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2604                 return -EPERM;
2605         if (get_user(type, p))
2606                 return -EFAULT;
2607         ret = 0;
2608
2609         switch (type)
2610         {
2611                 case TIOCL_SETSEL:
2612                         console_lock();
2613                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2614                         console_unlock();
2615                         break;
2616                 case TIOCL_PASTESEL:
2617                         ret = paste_selection(tty);
2618                         break;
2619                 case TIOCL_UNBLANKSCREEN:
2620                         console_lock();
2621                         unblank_screen();
2622                         console_unlock();
2623                         break;
2624                 case TIOCL_SELLOADLUT:
2625                         console_lock();
2626                         ret = sel_loadlut(p);
2627                         console_unlock();
2628                         break;
2629                 case TIOCL_GETSHIFTSTATE:
2630
2631         /*
2632          * Make it possible to react to Shift+Mousebutton.
2633          * Note that 'shift_state' is an undocumented
2634          * kernel-internal variable; programs not closely
2635          * related to the kernel should not use this.
2636          */
2637                         data = vt_get_shift_state();
2638                         ret = __put_user(data, p);
2639                         break;
2640                 case TIOCL_GETMOUSEREPORTING:
2641                         console_lock(); /* May be overkill */
2642                         data = mouse_reporting();
2643                         console_unlock();
2644                         ret = __put_user(data, p);
2645                         break;
2646                 case TIOCL_SETVESABLANK:
2647                         console_lock();
2648                         ret = set_vesa_blanking(p);
2649                         console_unlock();
2650                         break;
2651                 case TIOCL_GETKMSGREDIRECT:
2652                         data = vt_get_kmsg_redirect();
2653                         ret = __put_user(data, p);
2654                         break;
2655                 case TIOCL_SETKMSGREDIRECT:
2656                         if (!capable(CAP_SYS_ADMIN)) {
2657                                 ret = -EPERM;
2658                         } else {
2659                                 if (get_user(data, p+1))
2660                                         ret = -EFAULT;
2661                                 else
2662                                         vt_kmsg_redirect(data);
2663                         }
2664                         break;
2665                 case TIOCL_GETFGCONSOLE:
2666                         /* No locking needed as this is a transiently
2667                            correct return anyway if the caller hasn't
2668                            disabled switching */
2669                         ret = fg_console;
2670                         break;
2671                 case TIOCL_SCROLLCONSOLE:
2672                         if (get_user(lines, (s32 __user *)(p+4))) {
2673                                 ret = -EFAULT;
2674                         } else {
2675                                 /* Need the console lock here. Note that lots
2676                                    of other calls need fixing before the lock
2677                                    is actually useful ! */
2678                                 console_lock();
2679                                 scrollfront(vc_cons[fg_console].d, lines);
2680                                 console_unlock();
2681                                 ret = 0;
2682                         }
2683                         break;
2684                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2685                         console_lock();
2686                         ignore_poke = 1;
2687                         do_blank_screen(0);
2688                         console_unlock();
2689                         break;
2690                 case TIOCL_BLANKEDSCREEN:
2691                         ret = console_blanked;
2692                         break;
2693                 default:
2694                         ret = -EINVAL;
2695                         break;
2696         }
2697         return ret;
2698 }
2699
2700 /*
2701  * /dev/ttyN handling
2702  */
2703
2704 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2705 {
2706         int     retval;
2707
2708         retval = do_con_write(tty, buf, count);
2709         con_flush_chars(tty);
2710
2711         return retval;
2712 }
2713
2714 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2715 {
2716         if (in_interrupt())
2717                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2718         return do_con_write(tty, &ch, 1);
2719 }
2720
2721 static int con_write_room(struct tty_struct *tty)
2722 {
2723         if (tty->stopped)
2724                 return 0;
2725         return 32768;           /* No limit, really; we're not buffering */
2726 }
2727
2728 static int con_chars_in_buffer(struct tty_struct *tty)
2729 {
2730         return 0;               /* we're not buffering */
2731 }
2732
2733 /*
2734  * con_throttle and con_unthrottle are only used for
2735  * paste_selection(), which has to stuff in a large number of
2736  * characters...
2737  */
2738 static void con_throttle(struct tty_struct *tty)
2739 {
2740 }
2741
2742 static void con_unthrottle(struct tty_struct *tty)
2743 {
2744         struct vc_data *vc = tty->driver_data;
2745
2746         wake_up_interruptible(&vc->paste_wait);
2747 }
2748
2749 /*
2750  * Turn the Scroll-Lock LED on when the tty is stopped
2751  */
2752 static void con_stop(struct tty_struct *tty)
2753 {
2754         int console_num;
2755         if (!tty)
2756                 return;
2757         console_num = tty->index;
2758         if (!vc_cons_allocated(console_num))
2759                 return;
2760         vt_kbd_con_stop(console_num);
2761 }
2762
2763 /*
2764  * Turn the Scroll-Lock LED off when the console is started
2765  */
2766 static void con_start(struct tty_struct *tty)
2767 {
2768         int console_num;
2769         if (!tty)
2770                 return;
2771         console_num = tty->index;
2772         if (!vc_cons_allocated(console_num))
2773                 return;
2774         vt_kbd_con_start(console_num);
2775 }
2776
2777 static void con_flush_chars(struct tty_struct *tty)
2778 {
2779         struct vc_data *vc;
2780
2781         if (in_interrupt())     /* from flush_to_ldisc */
2782                 return;
2783
2784         /* if we race with con_close(), vt may be null */
2785         console_lock();
2786         vc = tty->driver_data;
2787         if (vc)
2788                 set_cursor(vc);
2789         console_unlock();
2790 }
2791
2792 /*
2793  * Allocate the console screen memory.
2794  */
2795 static int con_open(struct tty_struct *tty, struct file *filp)
2796 {
2797         unsigned int currcons = tty->index;
2798         int ret = 0;
2799
2800         console_lock();
2801         if (tty->driver_data == NULL) {
2802                 ret = vc_allocate(currcons);
2803                 if (ret == 0) {
2804                         struct vc_data *vc = vc_cons[currcons].d;
2805
2806                         /* Still being freed */
2807                         if (vc->port.tty) {
2808                                 console_unlock();
2809                                 return -ERESTARTSYS;
2810                         }
2811                         tty->driver_data = vc;
2812                         vc->port.tty = tty;
2813
2814                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2815                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2816                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2817                         }
2818                         if (vc->vc_utf)
2819                                 tty->termios->c_iflag |= IUTF8;
2820                         else
2821                                 tty->termios->c_iflag &= ~IUTF8;
2822                         console_unlock();
2823                         return ret;
2824                 }
2825         }
2826         console_unlock();
2827         return ret;
2828 }
2829
2830 static void con_close(struct tty_struct *tty, struct file *filp)
2831 {
2832         /* Nothing to do - we defer to shutdown */
2833 }
2834
2835 static void con_shutdown(struct tty_struct *tty)
2836 {
2837         struct vc_data *vc = tty->driver_data;
2838         BUG_ON(vc == NULL);
2839         console_lock();
2840         vc->port.tty = NULL;
2841         console_unlock();
2842         tty_shutdown(tty);
2843 }
2844
2845 static int default_italic_color    = 2; // green (ASCII)
2846 static int default_underline_color = 3; // cyan (ASCII)
2847 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2848 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2849
2850 static void vc_init(struct vc_data *vc, unsigned int rows,
2851                     unsigned int cols, int do_clear)
2852 {
2853         int j, k ;
2854
2855         vc->vc_cols = cols;
2856         vc->vc_rows = rows;
2857         vc->vc_size_row = cols << 1;
2858         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2859
2860         set_origin(vc);
2861         vc->vc_pos = vc->vc_origin;
2862         reset_vc(vc);
2863         for (j=k=0; j<16; j++) {
2864                 vc->vc_palette[k++] = default_red[j] ;
2865                 vc->vc_palette[k++] = default_grn[j] ;
2866                 vc->vc_palette[k++] = default_blu[j] ;
2867         }
2868         vc->vc_def_color       = 0x07;   /* white */
2869         vc->vc_ulcolor         = default_underline_color;
2870         vc->vc_itcolor         = default_italic_color;
2871         vc->vc_halfcolor       = 0x08;   /* grey */
2872         init_waitqueue_head(&vc->paste_wait);
2873         reset_terminal(vc, do_clear);
2874 }
2875
2876 /*
2877  * This routine initializes console interrupts, and does nothing
2878  * else. If you want the screen to clear, call tty_write with
2879  * the appropriate escape-sequence.
2880  */
2881
2882 static int __init con_init(void)
2883 {
2884         const char *display_desc = NULL;
2885         struct vc_data *vc;
2886         unsigned int currcons = 0, i;
2887
2888         console_lock();
2889
2890         if (conswitchp)
2891                 display_desc = conswitchp->con_startup();
2892         if (!display_desc) {
2893                 fg_console = 0;
2894                 console_unlock();
2895                 return 0;
2896         }
2897
2898         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2899                 struct con_driver *con_driver = &registered_con_driver[i];
2900
2901                 if (con_driver->con == NULL) {
2902                         con_driver->con = conswitchp;
2903                         con_driver->desc = display_desc;
2904                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2905                         con_driver->first = 0;
2906                         con_driver->last = MAX_NR_CONSOLES - 1;
2907                         break;
2908                 }
2909         }
2910
2911         for (i = 0; i < MAX_NR_CONSOLES; i++)
2912                 con_driver_map[i] = conswitchp;
2913
2914         if (blankinterval) {
2915                 blank_state = blank_normal_wait;
2916                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2917         }
2918
2919         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2920                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2921                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2922                 tty_port_init(&vc->port);
2923                 visual_init(vc, currcons, 1);
2924                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2925                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2926                         currcons || !vc->vc_sw->con_save_screen);
2927         }
2928         currcons = fg_console = 0;
2929         master_display_fg = vc = vc_cons[currcons].d;
2930         set_origin(vc);
2931         save_screen(vc);
2932         gotoxy(vc, vc->vc_x, vc->vc_y);
2933         csi_J(vc, 0);
2934         update_screen(vc);
2935         pr_info("Console: %s %s %dx%d\n",
2936                 vc->vc_can_do_color ? "colour" : "mono",
2937                 display_desc, vc->vc_cols, vc->vc_rows);
2938         printable = 1;
2939
2940         console_unlock();
2941
2942 #ifdef CONFIG_VT_CONSOLE
2943         register_console(&vt_console_driver);
2944 #endif
2945         return 0;
2946 }
2947 console_initcall(con_init);
2948
2949 static const struct tty_operations con_ops = {
2950         .open = con_open,
2951         .close = con_close,
2952         .write = con_write,
2953         .write_room = con_write_room,
2954         .put_char = con_put_char,
2955         .flush_chars = con_flush_chars,
2956         .chars_in_buffer = con_chars_in_buffer,
2957         .ioctl = vt_ioctl,
2958 #ifdef CONFIG_COMPAT
2959         .compat_ioctl = vt_compat_ioctl,
2960 #endif
2961         .stop = con_stop,
2962         .start = con_start,
2963         .throttle = con_throttle,
2964         .unthrottle = con_unthrottle,
2965         .resize = vt_resize,
2966         .shutdown = con_shutdown
2967 };
2968
2969 static struct cdev vc0_cdev;
2970
2971 static ssize_t show_tty_active(struct device *dev,
2972                                 struct device_attribute *attr, char *buf)
2973 {
2974         return sprintf(buf, "tty%d\n", fg_console + 1);
2975 }
2976 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2977
2978 int __init vty_init(const struct file_operations *console_fops)
2979 {
2980         cdev_init(&vc0_cdev, console_fops);
2981         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2982             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2983                 panic("Couldn't register /dev/tty0 driver\n");
2984         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2985         if (IS_ERR(tty0dev))
2986                 tty0dev = NULL;
2987         else
2988                 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2989
2990         vcs_init();
2991
2992         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2993         if (!console_driver)
2994                 panic("Couldn't allocate console driver\n");
2995
2996         console_driver->name = "tty";
2997         console_driver->name_base = 1;
2998         console_driver->major = TTY_MAJOR;
2999         console_driver->minor_start = 1;
3000         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3001         console_driver->init_termios = tty_std_termios;
3002         if (default_utf8)
3003                 console_driver->init_termios.c_iflag |= IUTF8;
3004         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3005         tty_set_operations(console_driver, &con_ops);
3006         if (tty_register_driver(console_driver))
3007                 panic("Couldn't register console driver\n");
3008         kbd_init();
3009         console_map_init();
3010 #ifdef CONFIG_MDA_CONSOLE
3011         mda_console_init();
3012 #endif
3013         return 0;
3014 }
3015
3016 #ifndef VT_SINGLE_DRIVER
3017
3018 static struct class *vtconsole_class;
3019
3020 static int bind_con_driver(const struct consw *csw, int first, int last,
3021                            int deflt)
3022 {
3023         struct module *owner = csw->owner;
3024         const char *desc = NULL;
3025         struct con_driver *con_driver;
3026         int i, j = -1, k = -1, retval = -ENODEV;
3027
3028         if (!try_module_get(owner))
3029                 return -ENODEV;
3030
3031         console_lock();
3032
3033         /* check if driver is registered */
3034         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3035                 con_driver = &registered_con_driver[i];
3036
3037                 if (con_driver->con == csw) {
3038                         desc = con_driver->desc;
3039                         retval = 0;
3040                         break;
3041                 }
3042         }
3043
3044         if (retval)
3045                 goto err;
3046
3047         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3048                 csw->con_startup();
3049                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3050         }
3051
3052         if (deflt) {
3053                 if (conswitchp)
3054                         module_put(conswitchp->owner);
3055
3056                 __module_get(owner);
3057                 conswitchp = csw;
3058         }
3059
3060         first = max(first, con_driver->first);
3061         last = min(last, con_driver->last);
3062
3063         for (i = first; i <= last; i++) {
3064                 int old_was_color;
3065                 struct vc_data *vc = vc_cons[i].d;
3066
3067                 if (con_driver_map[i])
3068                         module_put(con_driver_map[i]->owner);
3069                 __module_get(owner);
3070                 con_driver_map[i] = csw;
3071
3072                 if (!vc || !vc->vc_sw)
3073                         continue;
3074
3075                 j = i;
3076
3077                 if (CON_IS_VISIBLE(vc)) {
3078                         k = i;
3079                         save_screen(vc);
3080                 }
3081
3082                 old_was_color = vc->vc_can_do_color;
3083                 vc->vc_sw->con_deinit(vc);
3084                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3085                 visual_init(vc, i, 0);
3086                 set_origin(vc);
3087                 update_attr(vc);
3088
3089                 /* If the console changed between mono <-> color, then
3090                  * the attributes in the screenbuf will be wrong.  The
3091                  * following resets all attributes to something sane.
3092                  */
3093                 if (old_was_color != vc->vc_can_do_color)
3094                         clear_buffer_attributes(vc);
3095         }
3096
3097         pr_info("Console: switching ");
3098         if (!deflt)
3099                 printk("consoles %d-%d ", first+1, last+1);
3100         if (j >= 0) {
3101                 struct vc_data *vc = vc_cons[j].d;
3102
3103                 printk("to %s %s %dx%d\n",
3104                        vc->vc_can_do_color ? "colour" : "mono",
3105                        desc, vc->vc_cols, vc->vc_rows);
3106
3107                 if (k >= 0) {
3108                         vc = vc_cons[k].d;
3109                         update_screen(vc);
3110                 }
3111         } else
3112                 printk("to %s\n", desc);
3113
3114         retval = 0;
3115 err:
3116         console_unlock();
3117         module_put(owner);
3118         return retval;
3119 };
3120
3121 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3122 static int con_is_graphics(const struct consw *csw, int first, int last)
3123 {
3124         int i, retval = 0;
3125
3126         for (i = first; i <= last; i++) {
3127                 struct vc_data *vc = vc_cons[i].d;
3128
3129                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3130                         retval = 1;
3131                         break;
3132                 }
3133         }
3134
3135         return retval;
3136 }
3137
3138 /**
3139  * unbind_con_driver - unbind a console driver
3140  * @csw: pointer to console driver to unregister
3141  * @first: first in range of consoles that @csw should be unbound from
3142  * @last: last in range of consoles that @csw should be unbound from
3143  * @deflt: should next bound console driver be default after @csw is unbound?
3144  *
3145  * To unbind a driver from all possible consoles, pass 0 as @first and
3146  * %MAX_NR_CONSOLES as @last.
3147  *
3148  * @deflt controls whether the console that ends up replacing @csw should be
3149  * the default console.
3150  *
3151  * RETURNS:
3152  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3153  * or 0 on success.
3154  */
3155 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3156 {
3157         struct module *owner = csw->owner;
3158         const struct consw *defcsw = NULL;
3159         struct con_driver *con_driver = NULL, *con_back = NULL;
3160         int i, retval = -ENODEV;
3161
3162         if (!try_module_get(owner))
3163                 return -ENODEV;
3164
3165         console_lock();
3166
3167         /* check if driver is registered and if it is unbindable */
3168         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3169                 con_driver = &registered_con_driver[i];
3170
3171                 if (con_driver->con == csw &&
3172                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3173                         retval = 0;
3174                         break;
3175                 }
3176         }
3177
3178         if (retval) {
3179                 console_unlock();
3180                 goto err;
3181         }
3182
3183         retval = -ENODEV;
3184
3185         /* check if backup driver exists */
3186         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3187                 con_back = &registered_con_driver[i];
3188
3189                 if (con_back->con &&
3190                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3191                         defcsw = con_back->con;
3192                         retval = 0;
3193                         break;
3194                 }
3195         }
3196
3197         if (retval) {
3198                 console_unlock();
3199                 goto err;
3200         }
3201
3202         if (!con_is_bound(csw)) {
3203                 console_unlock();
3204                 goto err;
3205         }
3206
3207         first = max(first, con_driver->first);
3208         last = min(last, con_driver->last);
3209
3210         for (i = first; i <= last; i++) {
3211                 if (con_driver_map[i] == csw) {
3212                         module_put(csw->owner);
3213                         con_driver_map[i] = NULL;
3214                 }
3215         }
3216
3217         if (!con_is_bound(defcsw)) {
3218                 const struct consw *defconsw = conswitchp;
3219
3220                 defcsw->con_startup();
3221                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3222                 /*
3223                  * vgacon may change the default driver to point
3224                  * to dummycon, we restore it here...
3225                  */
3226                 conswitchp = defconsw;
3227         }
3228
3229         if (!con_is_bound(csw))
3230                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3231
3232         console_unlock();
3233         /* ignore return value, binding should not fail */
3234         bind_con_driver(defcsw, first, last, deflt);
3235 err:
3236         module_put(owner);
3237         return retval;
3238
3239 }
3240 EXPORT_SYMBOL(unbind_con_driver);
3241
3242 static int vt_bind(struct con_driver *con)
3243 {
3244         const struct consw *defcsw = NULL, *csw = NULL;
3245         int i, more = 1, first = -1, last = -1, deflt = 0;
3246
3247         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3248             con_is_graphics(con->con, con->first, con->last))
3249                 goto err;
3250
3251         csw = con->con;
3252
3253         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3254                 struct con_driver *con = &registered_con_driver[i];
3255
3256                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3257                         defcsw = con->con;
3258                         break;
3259                 }
3260         }
3261
3262         if (!defcsw)
3263                 goto err;
3264
3265         while (more) {
3266                 more = 0;
3267
3268                 for (i = con->first; i <= con->last; i++) {
3269                         if (con_driver_map[i] == defcsw) {
3270                                 if (first == -1)
3271                                         first = i;
3272                                 last = i;
3273                                 more = 1;
3274                         } else if (first != -1)
3275                                 break;
3276                 }
3277
3278                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3279                         deflt = 1;
3280
3281                 if (first != -1)
3282                         bind_con_driver(csw, first, last, deflt);
3283
3284                 first = -1;
3285                 last = -1;
3286                 deflt = 0;
3287         }
3288
3289 err:
3290         return 0;
3291 }
3292
3293 static int vt_unbind(struct con_driver *con)
3294 {
3295         const struct consw *csw = NULL;
3296         int i, more = 1, first = -1, last = -1, deflt = 0;
3297
3298         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3299             con_is_graphics(con->con, con->first, con->last))
3300                 goto err;
3301
3302         csw = con->con;
3303
3304         while (more) {
3305                 more = 0;
3306
3307                 for (i = con->first; i <= con->last; i++) {
3308                         if (con_driver_map[i] == csw) {
3309                                 if (first == -1)
3310                                         first = i;
3311                                 last = i;
3312                                 more = 1;
3313                         } else if (first != -1)
3314                                 break;
3315                 }
3316
3317                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3318                         deflt = 1;
3319
3320                 if (first != -1)
3321                         unbind_con_driver(csw, first, last, deflt);
3322
3323                 first = -1;
3324                 last = -1;
3325                 deflt = 0;
3326         }
3327
3328 err:
3329         return 0;
3330 }
3331 #else
3332 static inline int vt_bind(struct con_driver *con)
3333 {
3334         return 0;
3335 }
3336 static inline int vt_unbind(struct con_driver *con)
3337 {
3338         return 0;
3339 }
3340 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3341
3342 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3343                           const char *buf, size_t count)
3344 {
3345         struct con_driver *con = dev_get_drvdata(dev);
3346         int bind = simple_strtoul(buf, NULL, 0);
3347
3348         if (bind)
3349                 vt_bind(con);
3350         else
3351                 vt_unbind(con);
3352
3353         return count;
3354 }
3355
3356 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3357                          char *buf)
3358 {
3359         struct con_driver *con = dev_get_drvdata(dev);
3360         int bind = con_is_bound(con->con);
3361
3362         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3363 }
3364
3365 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3366                          char *buf)
3367 {
3368         struct con_driver *con = dev_get_drvdata(dev);
3369
3370         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3371                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3372                          con->desc);
3373
3374 }
3375
3376 static struct device_attribute device_attrs[] = {
3377         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3378         __ATTR(name, S_IRUGO, show_name, NULL),
3379 };
3380
3381 static int vtconsole_init_device(struct con_driver *con)
3382 {
3383         int i;
3384         int error = 0;
3385
3386         con->flag |= CON_DRIVER_FLAG_ATTR;
3387         dev_set_drvdata(con->dev, con);
3388         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3389                 error = device_create_file(con->dev, &device_attrs[i]);
3390                 if (error)
3391                         break;
3392         }
3393
3394         if (error) {
3395                 while (--i >= 0)
3396                         device_remove_file(con->dev, &device_attrs[i]);
3397                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3398         }
3399
3400         return error;
3401 }
3402
3403 static void vtconsole_deinit_device(struct con_driver *con)
3404 {
3405         int i;
3406
3407         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3408                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3409                         device_remove_file(con->dev, &device_attrs[i]);
3410                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3411         }
3412 }
3413
3414 /**
3415  * con_is_bound - checks if driver is bound to the console
3416  * @csw: console driver
3417  *
3418  * RETURNS: zero if unbound, nonzero if bound
3419  *
3420  * Drivers can call this and if zero, they should release
3421  * all resources allocated on con_startup()
3422  */
3423 int con_is_bound(const struct consw *csw)
3424 {
3425         int i, bound = 0;
3426
3427         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3428                 if (con_driver_map[i] == csw) {
3429                         bound = 1;
3430                         break;
3431                 }
3432         }
3433
3434         return bound;
3435 }
3436 EXPORT_SYMBOL(con_is_bound);
3437
3438 /**
3439  * con_debug_enter - prepare the console for the kernel debugger
3440  * @sw: console driver
3441  *
3442  * Called when the console is taken over by the kernel debugger, this
3443  * function needs to save the current console state, then put the console
3444  * into a state suitable for the kernel debugger.
3445  *
3446  * RETURNS:
3447  * Zero on success, nonzero if a failure occurred when trying to prepare
3448  * the console for the debugger.
3449  */
3450 int con_debug_enter(struct vc_data *vc)
3451 {
3452         int ret = 0;
3453
3454         saved_fg_console = fg_console;
3455         saved_last_console = last_console;
3456         saved_want_console = want_console;
3457         saved_vc_mode = vc->vc_mode;
3458         saved_console_blanked = console_blanked;
3459         vc->vc_mode = KD_TEXT;
3460         console_blanked = 0;
3461         if (vc->vc_sw->con_debug_enter)
3462                 ret = vc->vc_sw->con_debug_enter(vc);
3463 #ifdef CONFIG_KGDB_KDB
3464         /* Set the initial LINES variable if it is not already set */
3465         if (vc->vc_rows < 999) {
3466                 int linecount;
3467                 char lns[4];
3468                 const char *setargs[3] = {
3469                         "set",
3470                         "LINES",
3471                         lns,
3472                 };
3473                 if (kdbgetintenv(setargs[0], &linecount)) {
3474                         snprintf(lns, 4, "%i", vc->vc_rows);
3475                         kdb_set(2, setargs);
3476                 }
3477         }
3478 #endif /* CONFIG_KGDB_KDB */
3479         return ret;
3480 }
3481 EXPORT_SYMBOL_GPL(con_debug_enter);
3482
3483 /**
3484  * con_debug_leave - restore console state
3485  * @sw: console driver
3486  *
3487  * Restore the console state to what it was before the kernel debugger
3488  * was invoked.
3489  *
3490  * RETURNS:
3491  * Zero on success, nonzero if a failure occurred when trying to restore
3492  * the console.
3493  */
3494 int con_debug_leave(void)
3495 {
3496         struct vc_data *vc;
3497         int ret = 0;
3498
3499         fg_console = saved_fg_console;
3500         last_console = saved_last_console;
3501         want_console = saved_want_console;
3502         console_blanked = saved_console_blanked;
3503         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3504
3505         vc = vc_cons[fg_console].d;
3506         if (vc->vc_sw->con_debug_leave)
3507                 ret = vc->vc_sw->con_debug_leave(vc);
3508         return ret;
3509 }
3510 EXPORT_SYMBOL_GPL(con_debug_leave);
3511
3512 /**
3513  * register_con_driver - register console driver to console layer
3514  * @csw: console driver
3515  * @first: the first console to take over, minimum value is 0
3516  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3517  *
3518  * DESCRIPTION: This function registers a console driver which can later
3519  * bind to a range of consoles specified by @first and @last. It will
3520  * also initialize the console driver by calling con_startup().
3521  */
3522 int register_con_driver(const struct consw *csw, int first, int last)
3523 {
3524         struct module *owner = csw->owner;
3525         struct con_driver *con_driver;
3526         const char *desc;
3527         int i, retval = 0;
3528
3529         if (!try_module_get(owner))
3530                 return -ENODEV;
3531
3532         console_lock();
3533
3534         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3535                 con_driver = &registered_con_driver[i];
3536
3537                 /* already registered */
3538                 if (con_driver->con == csw)
3539                         retval = -EBUSY;
3540         }
3541
3542         if (retval)
3543                 goto err;
3544
3545         desc = csw->con_startup();
3546
3547         if (!desc)
3548                 goto err;
3549
3550         retval = -EINVAL;
3551
3552         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3553                 con_driver = &registered_con_driver[i];
3554
3555                 if (con_driver->con == NULL) {
3556                         con_driver->con = csw;
3557                         con_driver->desc = desc;
3558                         con_driver->node = i;
3559                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3560                                            CON_DRIVER_FLAG_INIT;
3561                         con_driver->first = first;
3562                         con_driver->last = last;
3563                         retval = 0;
3564                         break;
3565                 }
3566         }
3567
3568         if (retval)
3569                 goto err;
3570
3571         con_driver->dev = device_create(vtconsole_class, NULL,
3572                                                 MKDEV(0, con_driver->node),
3573                                                 NULL, "vtcon%i",
3574                                                 con_driver->node);
3575
3576         if (IS_ERR(con_driver->dev)) {
3577                 printk(KERN_WARNING "Unable to create device for %s; "
3578                        "errno = %ld\n", con_driver->desc,
3579                        PTR_ERR(con_driver->dev));
3580                 con_driver->dev = NULL;
3581         } else {
3582                 vtconsole_init_device(con_driver);
3583         }
3584
3585 err:
3586         console_unlock();
3587         module_put(owner);
3588         return retval;
3589 }
3590 EXPORT_SYMBOL(register_con_driver);
3591
3592 /**
3593  * unregister_con_driver - unregister console driver from console layer
3594  * @csw: console driver
3595  *
3596  * DESCRIPTION: All drivers that registers to the console layer must
3597  * call this function upon exit, or if the console driver is in a state
3598  * where it won't be able to handle console services, such as the
3599  * framebuffer console without loaded framebuffer drivers.
3600  *
3601  * The driver must unbind first prior to unregistration.
3602  */
3603 int unregister_con_driver(const struct consw *csw)
3604 {
3605         int i, retval = -ENODEV;
3606
3607         console_lock();
3608
3609         /* cannot unregister a bound driver */
3610         if (con_is_bound(csw))
3611                 goto err;
3612
3613         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3614                 struct con_driver *con_driver = &registered_con_driver[i];
3615
3616                 if (con_driver->con == csw &&
3617                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3618                         vtconsole_deinit_device(con_driver);
3619                         device_destroy(vtconsole_class,
3620                                        MKDEV(0, con_driver->node));
3621                         con_driver->con = NULL;
3622                         con_driver->desc = NULL;
3623                         con_driver->dev = NULL;
3624                         con_driver->node = 0;
3625                         con_driver->flag = 0;
3626                         con_driver->first = 0;
3627                         con_driver->last = 0;
3628                         retval = 0;
3629                         break;
3630                 }
3631         }
3632 err:
3633         console_unlock();
3634         return retval;
3635 }
3636 EXPORT_SYMBOL(unregister_con_driver);
3637
3638 /*
3639  *      If we support more console drivers, this function is used
3640  *      when a driver wants to take over some existing consoles
3641  *      and become default driver for newly opened ones.
3642  *
3643  *      take_over_console is basically a register followed by unbind
3644  */
3645 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3646 {
3647         int err;
3648
3649         err = register_con_driver(csw, first, last);
3650         /* if we get an busy error we still want to bind the console driver
3651          * and return success, as we may have unbound the console driver
3652          * but not unregistered it.
3653         */
3654         if (err == -EBUSY)
3655                 err = 0;
3656         if (!err)
3657                 bind_con_driver(csw, first, last, deflt);
3658
3659         return err;
3660 }
3661
3662 /*
3663  * give_up_console is a wrapper to unregister_con_driver. It will only
3664  * work if driver is fully unbound.
3665  */
3666 void give_up_console(const struct consw *csw)
3667 {
3668         unregister_con_driver(csw);
3669 }
3670
3671 static int __init vtconsole_class_init(void)
3672 {
3673         int i;
3674
3675         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3676         if (IS_ERR(vtconsole_class)) {
3677                 printk(KERN_WARNING "Unable to create vt console class; "
3678                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3679                 vtconsole_class = NULL;
3680         }
3681
3682         /* Add system drivers to sysfs */
3683         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3684                 struct con_driver *con = &registered_con_driver[i];
3685
3686                 if (con->con && !con->dev) {
3687                         con->dev = device_create(vtconsole_class, NULL,
3688                                                          MKDEV(0, con->node),
3689                                                          NULL, "vtcon%i",
3690                                                          con->node);
3691
3692                         if (IS_ERR(con->dev)) {
3693                                 printk(KERN_WARNING "Unable to create "
3694                                        "device for %s; errno = %ld\n",
3695                                        con->desc, PTR_ERR(con->dev));
3696                                 con->dev = NULL;
3697                         } else {
3698                                 vtconsole_init_device(con);
3699                         }
3700                 }
3701         }
3702
3703         return 0;
3704 }
3705 postcore_initcall(vtconsole_class_init);
3706
3707 #endif
3708
3709 /*
3710  *      Screen blanking
3711  */
3712
3713 static int set_vesa_blanking(char __user *p)
3714 {
3715         unsigned int mode;
3716
3717         if (get_user(mode, p + 1))
3718                 return -EFAULT;
3719
3720         vesa_blank_mode = (mode < 4) ? mode : 0;
3721         return 0;
3722 }
3723
3724 void do_blank_screen(int entering_gfx)
3725 {
3726         struct vc_data *vc = vc_cons[fg_console].d;
3727         int i;
3728
3729         WARN_CONSOLE_UNLOCKED();
3730
3731         if (console_blanked) {
3732                 if (blank_state == blank_vesa_wait) {
3733                         blank_state = blank_off;
3734                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3735                 }
3736                 return;
3737         }
3738
3739         /* entering graphics mode? */
3740         if (entering_gfx) {
3741                 hide_cursor(vc);
3742                 save_screen(vc);
3743                 vc->vc_sw->con_blank(vc, -1, 1);
3744                 console_blanked = fg_console + 1;
3745                 blank_state = blank_off;
3746                 set_origin(vc);
3747                 return;
3748         }
3749
3750         if (blank_state != blank_normal_wait)
3751                 return;
3752         blank_state = blank_off;
3753
3754         /* don't blank graphics */
3755         if (vc->vc_mode != KD_TEXT) {
3756                 console_blanked = fg_console + 1;
3757                 return;
3758         }
3759
3760         hide_cursor(vc);
3761         del_timer_sync(&console_timer);
3762         blank_timer_expired = 0;
3763
3764         save_screen(vc);
3765         /* In case we need to reset origin, blanking hook returns 1 */
3766         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3767         console_blanked = fg_console + 1;
3768         if (i)
3769                 set_origin(vc);
3770
3771         if (console_blank_hook && console_blank_hook(1))
3772                 return;
3773
3774         if (vesa_off_interval && vesa_blank_mode) {
3775                 blank_state = blank_vesa_wait;
3776                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3777         }
3778         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3779 }
3780 EXPORT_SYMBOL(do_blank_screen);
3781
3782 /*
3783  * Called by timer as well as from vt_console_driver
3784  */
3785 void do_unblank_screen(int leaving_gfx)
3786 {
3787         struct vc_data *vc;
3788
3789         /* This should now always be called from a "sane" (read: can schedule)
3790          * context for the sake of the low level drivers, except in the special
3791          * case of oops_in_progress
3792          */
3793         if (!oops_in_progress)
3794                 might_sleep();
3795
3796         WARN_CONSOLE_UNLOCKED();
3797
3798         ignore_poke = 0;
3799         if (!console_blanked)
3800                 return;
3801         if (!vc_cons_allocated(fg_console)) {
3802                 /* impossible */
3803                 pr_warning("unblank_screen: tty %d not allocated ??\n",
3804                            fg_console+1);
3805                 return;
3806         }
3807         vc = vc_cons[fg_console].d;
3808         /* Try to unblank in oops case too */
3809         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3810                 return; /* but leave console_blanked != 0 */
3811
3812         if (blankinterval) {
3813                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3814                 blank_state = blank_normal_wait;
3815         }
3816
3817         console_blanked = 0;
3818         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3819                 /* Low-level driver cannot restore -> do it ourselves */
3820                 update_screen(vc);
3821         if (console_blank_hook)
3822                 console_blank_hook(0);
3823         set_palette(vc);
3824         set_cursor(vc);
3825         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3826 }
3827 EXPORT_SYMBOL(do_unblank_screen);
3828
3829 /*
3830  * This is called by the outside world to cause a forced unblank, mostly for
3831  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3832  * call it with 1 as an argument and so force a mode restore... that may kill
3833  * X or at least garbage the screen but would also make the Oops visible...
3834  */
3835 void unblank_screen(void)
3836 {
3837         do_unblank_screen(0);
3838 }
3839
3840 /*
3841  * We defer the timer blanking to work queue so it can take the console mutex
3842  * (console operations can still happen at irq time, but only from printk which
3843  * has the console mutex. Not perfect yet, but better than no locking
3844  */
3845 static void blank_screen_t(unsigned long dummy)
3846 {
3847         if (unlikely(!keventd_up())) {
3848                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3849                 return;
3850         }
3851         blank_timer_expired = 1;
3852         schedule_work(&console_work);
3853 }
3854
3855 void poke_blanked_console(void)
3856 {
3857         WARN_CONSOLE_UNLOCKED();
3858
3859         /* Add this so we quickly catch whoever might call us in a non
3860          * safe context. Nowadays, unblank_screen() isn't to be called in
3861          * atomic contexts and is allowed to schedule (with the special case
3862          * of oops_in_progress, but that isn't of any concern for this
3863          * function. --BenH.
3864          */
3865         might_sleep();
3866
3867         /* This isn't perfectly race free, but a race here would be mostly harmless,
3868          * at worse, we'll do a spurrious blank and it's unlikely
3869          */
3870         del_timer(&console_timer);
3871         blank_timer_expired = 0;
3872
3873         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3874                 return;
3875         if (console_blanked)
3876                 unblank_screen();
3877         else if (blankinterval) {
3878                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3879                 blank_state = blank_normal_wait;
3880         }
3881 }
3882
3883 /*
3884  *      Palettes
3885  */
3886
3887 static void set_palette(struct vc_data *vc)
3888 {
3889         WARN_CONSOLE_UNLOCKED();
3890
3891         if (vc->vc_mode != KD_GRAPHICS)
3892                 vc->vc_sw->con_set_palette(vc, color_table);
3893 }
3894
3895 static int set_get_cmap(unsigned char __user *arg, int set)
3896 {
3897     int i, j, k;
3898
3899     WARN_CONSOLE_UNLOCKED();
3900
3901     for (i = 0; i < 16; i++)
3902         if (set) {
3903             get_user(default_red[i], arg++);
3904             get_user(default_grn[i], arg++);
3905             get_user(default_blu[i], arg++);
3906         } else {
3907             put_user(default_red[i], arg++);
3908             put_user(default_grn[i], arg++);
3909             put_user(default_blu[i], arg++);
3910         }
3911     if (set) {
3912         for (i = 0; i < MAX_NR_CONSOLES; i++)
3913             if (vc_cons_allocated(i)) {
3914                 for (j = k = 0; j < 16; j++) {
3915                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3916                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3917                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3918                 }
3919                 set_palette(vc_cons[i].d);
3920             }
3921     }
3922     return 0;
3923 }
3924
3925 /*
3926  * Load palette into the DAC registers. arg points to a colour
3927  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3928  */
3929
3930 int con_set_cmap(unsigned char __user *arg)
3931 {
3932         int rc;
3933
3934         console_lock();
3935         rc = set_get_cmap (arg,1);
3936         console_unlock();
3937
3938         return rc;
3939 }
3940
3941 int con_get_cmap(unsigned char __user *arg)
3942 {
3943         int rc;
3944
3945         console_lock();
3946         rc = set_get_cmap (arg,0);
3947         console_unlock();
3948
3949         return rc;
3950 }
3951
3952 void reset_palette(struct vc_data *vc)
3953 {
3954         int j, k;
3955         for (j=k=0; j<16; j++) {
3956                 vc->vc_palette[k++] = default_red[j];
3957                 vc->vc_palette[k++] = default_grn[j];
3958                 vc->vc_palette[k++] = default_blu[j];
3959         }
3960         set_palette(vc);
3961 }
3962
3963 /*
3964  *  Font switching
3965  *
3966  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3967  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3968  *  depending on width) reserved for each character which is kinda wasty, but
3969  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3970  *  is up to the actual low-level console-driver convert data into its favorite
3971  *  format (maybe we should add a `fontoffset' field to the `display'
3972  *  structure so we won't have to convert the fontdata all the time.
3973  *  /Jes
3974  */
3975
3976 #define max_font_size 65536
3977
3978 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3979 {
3980         struct console_font font;
3981         int rc = -EINVAL;
3982         int c;
3983
3984         if (op->data) {
3985                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3986                 if (!font.data)
3987                         return -ENOMEM;
3988         } else
3989                 font.data = NULL;
3990
3991         console_lock();
3992         if (vc->vc_mode != KD_TEXT)
3993                 rc = -EINVAL;
3994         else if (vc->vc_sw->con_font_get)
3995                 rc = vc->vc_sw->con_font_get(vc, &font);
3996         else
3997                 rc = -ENOSYS;
3998         console_unlock();
3999
4000         if (rc)
4001                 goto out;
4002
4003         c = (font.width+7)/8 * 32 * font.charcount;
4004
4005         if (op->data && font.charcount > op->charcount)
4006                 rc = -ENOSPC;
4007         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4008                 if (font.width > op->width || font.height > op->height)
4009                         rc = -ENOSPC;
4010         } else {
4011                 if (font.width != 8)
4012                         rc = -EIO;
4013                 else if ((op->height && font.height > op->height) ||
4014                          font.height > 32)
4015                         rc = -ENOSPC;
4016         }
4017         if (rc)
4018                 goto out;
4019
4020         op->height = font.height;
4021         op->width = font.width;
4022         op->charcount = font.charcount;
4023
4024         if (op->data && copy_to_user(op->data, font.data, c))
4025                 rc = -EFAULT;
4026
4027 out:
4028         kfree(font.data);
4029         return rc;
4030 }
4031
4032 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4033 {
4034         struct console_font font;
4035         int rc = -EINVAL;
4036         int size;
4037
4038         if (vc->vc_mode != KD_TEXT)
4039                 return -EINVAL;
4040         if (!op->data)
4041                 return -EINVAL;
4042         if (op->charcount > 512)
4043                 return -EINVAL;
4044         if (!op->height) {              /* Need to guess font height [compat] */
4045                 int h, i;
4046                 u8 __user *charmap = op->data;
4047                 u8 tmp;
4048
4049                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4050                    so that we can get rid of this soon */
4051                 if (!(op->flags & KD_FONT_FLAG_OLD))
4052                         return -EINVAL;
4053                 for (h = 32; h > 0; h--)
4054                         for (i = 0; i < op->charcount; i++) {
4055                                 if (get_user(tmp, &charmap[32*i+h-1]))
4056                                         return -EFAULT;
4057                                 if (tmp)
4058                                         goto nonzero;
4059                         }
4060                 return -EINVAL;
4061         nonzero:
4062                 op->height = h;
4063         }
4064         if (op->width <= 0 || op->width > 32 || op->height > 32)
4065                 return -EINVAL;
4066         size = (op->width+7)/8 * 32 * op->charcount;
4067         if (size > max_font_size)
4068                 return -ENOSPC;
4069         font.charcount = op->charcount;
4070         font.height = op->height;
4071         font.width = op->width;
4072         font.data = memdup_user(op->data, size);
4073         if (IS_ERR(font.data))
4074                 return PTR_ERR(font.data);
4075         console_lock();
4076         if (vc->vc_mode != KD_TEXT)
4077                 rc = -EINVAL;
4078         else if (vc->vc_sw->con_font_set)
4079                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4080         else
4081                 rc = -ENOSYS;
4082         console_unlock();
4083         kfree(font.data);
4084         return rc;
4085 }
4086
4087 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4088 {
4089         struct console_font font = {.width = op->width, .height = op->height};
4090         char name[MAX_FONT_NAME];
4091         char *s = name;
4092         int rc;
4093
4094
4095         if (!op->data)
4096                 s = NULL;
4097         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4098                 return -EFAULT;
4099         else
4100                 name[MAX_FONT_NAME - 1] = 0;
4101
4102         console_lock();
4103         if (vc->vc_mode != KD_TEXT) {
4104                 console_unlock();
4105                 return -EINVAL;
4106         }
4107         if (vc->vc_sw->con_font_default)
4108                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4109         else
4110                 rc = -ENOSYS;
4111         console_unlock();
4112         if (!rc) {
4113                 op->width = font.width;
4114                 op->height = font.height;
4115         }
4116         return rc;
4117 }
4118
4119 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4120 {
4121         int con = op->height;
4122         int rc;
4123
4124
4125         console_lock();
4126         if (vc->vc_mode != KD_TEXT)
4127                 rc = -EINVAL;
4128         else if (!vc->vc_sw->con_font_copy)
4129                 rc = -ENOSYS;
4130         else if (con < 0 || !vc_cons_allocated(con))
4131                 rc = -ENOTTY;
4132         else if (con == vc->vc_num)     /* nothing to do */
4133                 rc = 0;
4134         else
4135                 rc = vc->vc_sw->con_font_copy(vc, con);
4136         console_unlock();
4137         return rc;
4138 }
4139
4140 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4141 {
4142         switch (op->op) {
4143         case KD_FONT_OP_SET:
4144                 return con_font_set(vc, op);
4145         case KD_FONT_OP_GET:
4146                 return con_font_get(vc, op);
4147         case KD_FONT_OP_SET_DEFAULT:
4148                 return con_font_default(vc, op);
4149         case KD_FONT_OP_COPY:
4150                 return con_font_copy(vc, op);
4151         }
4152         return -ENOSYS;
4153 }
4154
4155 /*
4156  *      Interface exported to selection and vcs.
4157  */
4158
4159 /* used by selection */
4160 u16 screen_glyph(struct vc_data *vc, int offset)
4161 {
4162         u16 w = scr_readw(screenpos(vc, offset, 1));
4163         u16 c = w & 0xff;
4164
4165         if (w & vc->vc_hi_font_mask)
4166                 c |= 0x100;
4167         return c;
4168 }
4169 EXPORT_SYMBOL_GPL(screen_glyph);
4170
4171 /* used by vcs - note the word offset */
4172 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4173 {
4174         return screenpos(vc, 2 * w_offset, viewed);
4175 }
4176
4177 void getconsxy(struct vc_data *vc, unsigned char *p)
4178 {
4179         p[0] = vc->vc_x;
4180         p[1] = vc->vc_y;
4181 }
4182
4183 void putconsxy(struct vc_data *vc, unsigned char *p)
4184 {
4185         hide_cursor(vc);
4186         gotoxy(vc, p[0], p[1]);
4187         set_cursor(vc);
4188 }
4189
4190 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4191 {
4192         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4193                 return softcursor_original;
4194         return scr_readw(org);
4195 }
4196
4197 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4198 {
4199         scr_writew(val, org);
4200         if ((unsigned long)org == vc->vc_pos) {
4201                 softcursor_original = -1;
4202                 add_softcursor(vc);
4203         }
4204 }
4205
4206 void vcs_scr_updated(struct vc_data *vc)
4207 {
4208         notify_update(vc);
4209 }
4210
4211 #ifdef CONFIG_BOOTSPLASH
4212 void con_remap_def_color(struct vc_data *vc, int new_color)
4213 {
4214         unsigned short *sbuf = screenpos(vc, 0, 1);
4215         unsigned c, len = vc->vc_screenbuf_size >> 1;
4216         unsigned int bits, old_color;
4217
4218         if (sbuf) {
4219                 old_color = vc->vc_def_color << 8;
4220                 new_color <<= 8;
4221                 while (len--) {
4222                         c = scr_readw(sbuf);
4223                         bits = (old_color ^ new_color) & 0xf000;
4224                         if (((c ^ old_color) & 0xf000) == 0)
4225                                 scr_writew((c ^ bits), sbuf);
4226                         *sbuf ^= bits;
4227                         bits = (old_color ^ new_color) & 0x0f00;
4228                         if (((c ^ old_color) & 0x0f00) == 0)
4229                                 scr_writew((c ^ bits), sbuf);
4230                         *sbuf ^= bits;
4231                         sbuf++;
4232                 }
4233                 new_color >>= 8;
4234         }
4235         vc->vc_def_color = vc->vc_color = new_color;
4236         update_attr(vc);
4237 }
4238 #endif
4239
4240 /*
4241  *      Visible symbols for modules
4242  */
4243
4244 EXPORT_SYMBOL(color_table);
4245 EXPORT_SYMBOL(default_red);
4246 EXPORT_SYMBOL(default_grn);
4247 EXPORT_SYMBOL(default_blu);
4248 EXPORT_SYMBOL(update_region);
4249 EXPORT_SYMBOL(redraw_screen);
4250 EXPORT_SYMBOL(vc_resize);
4251 EXPORT_SYMBOL(fg_console);
4252 EXPORT_SYMBOL(console_blank_hook);
4253 EXPORT_SYMBOL(console_blanked);
4254 EXPORT_SYMBOL(vc_cons);
4255 EXPORT_SYMBOL(global_cursor_default);
4256 #ifndef VT_SINGLE_DRIVER
4257 EXPORT_SYMBOL(take_over_console);
4258 EXPORT_SYMBOL(give_up_console);
4259 #endif