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