drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <g-hunt@ee.utah.edu>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21  *
  22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <poe@daimi.aau.dk>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <geert@linux-m68k.org>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <arno@usn.nl>
  39  *     - David Carter <carter@cs.bris.ac.uk>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111 #define CON_DRIVER_FLAG_ZOMBIE 8
 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 #define DEFAULT_CURSOR_BLINK_MS 200
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void con_driver_unregister_callback(struct work_struct *ignored);
 159 static void blank_screen_t(unsigned long dummy);
 160 static void set_palette(struct vc_data *vc);
 161
 162 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 163
 164 static int printable;           /* Is console ready for printing? */
 165 int default_utf8 = true;
 166 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 167 int global_cursor_default = -1;
 168 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 169
 170 static int cur_default = CUR_DEFAULT;
 171 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 172
 173 /*
 174  * ignore_poke: don't unblank the screen when things are typed.  This is
 175  * mainly for the privacy of braille terminal users.
 176  */
 177 static int ignore_poke;
 178
 179 int do_poke_blanked_console;
 180 int console_blanked;
 181
 182 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 183 static int vesa_off_interval;
 184 static int blankinterval = 10*60;
 185 core_param(consoleblank, blankinterval, int, 0444);
 186
 187 static DECLARE_WORK(console_work, console_callback);
 188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 189
 190 /*
 191  * fg_console is the current virtual console,
 192  * last_console is the last used one,
 193  * want_console is the console we want to switch to,
 194  * saved_* variants are for save/restore around kernel debugger enter/leave
 195  */
 196 int fg_console;
 197 int last_console;
 198 int want_console = -1;
 199 static int saved_fg_console;
 200 static int saved_last_console;
 201 static int saved_want_console;
 202 static int saved_vc_mode;
 203 static int saved_console_blanked;
 204
 205 /*
 206  * For each existing display, we have a pointer to console currently visible
 207  * on that display, allowing consoles other than fg_console to be refreshed
 208  * appropriately. Unless the low-level driver supplies its own display_fg
 209  * variable, we use this one for the "master display".
 210  */
 211 static struct vc_data *master_display_fg;
 212
 213 /*
 214  * Unfortunately, we need to delay tty echo when we're currently writing to the
 215  * console since the code is (and always was) not re-entrant, so we schedule
 216  * all flip requests to process context with schedule-task() and run it from
 217  * console_callback().
 218  */
 219
 220 /*
 221  * For the same reason, we defer scrollback to the console callback.
 222  */
 223 static int scrollback_delta;
 224
 225 /*
 226  * Hook so that the power management routines can (un)blank
 227  * the console on our behalf.
 228  */
 229 int (*console_blank_hook)(int);
 230
 231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 232 static int blank_state;
 233 static int blank_timer_expired;
 234 enum {
 235         blank_off = 0,
 236         blank_normal_wait,
 237         blank_vesa_wait,
 238 };
 239
 240 /*
 241  * /sys/class/tty/tty0/
 242  *
 243  * the attribute 'active' contains the name of the current vc
 244  * console and it supports poll() to detect vc switches
 245  */
 246 static struct device *tty0dev;
 247
 248 /*
 249  * Notifier list for console events.
 250  */
 251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 252
 253 int register_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(register_vt_notifier);
 258
 259 int unregister_vt_notifier(struct notifier_block *nb)
 260 {
 261         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 262 }
 263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 264
 265 static void notify_write(struct vc_data *vc, unsigned int unicode)
 266 {
 267         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 269 }
 270
 271 static void notify_update(struct vc_data *vc)
 272 {
 273         struct vt_notifier_param param = { .vc = vc };
 274         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 275 }
 276 /*
 277  *      Low-Level Functions
 278  */
 279
 280 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 281
 282 #ifdef VT_BUF_VRAM_ONLY
 283 #define DO_UPDATE(vc)   0
 284 #else
 285 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 286 #endif
 287
 288 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 289 {
 290         unsigned short *p;
 291
 292         if (!viewed)
 293                 p = (unsigned short *)(vc->vc_origin + offset);
 294         else if (!vc->vc_sw->con_screen_pos)
 295                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 296         else
 297                 p = vc->vc_sw->con_screen_pos(vc, offset);
 298         return p;
 299 }
 300
 301 /* Called  from the keyboard irq path.. */
 302 static inline void scrolldelta(int lines)
 303 {
 304         /* FIXME */
 305         /* scrolldelta needs some kind of consistency lock, but the BKL was
 306            and still is not protecting versus the scheduled back end */
 307         scrollback_delta += lines;
 308         schedule_console_callback();
 309 }
 310
 311 void schedule_console_callback(void)
 312 {
 313         schedule_work(&console_work);
 314 }
 315
 316 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 317 {
 318         unsigned short *d, *s;
 319
 320         if (t+nr >= b)
 321                 nr = b - t - 1;
 322         if (b > vc->vc_rows || t >= b || nr < 1)
 323                 return;
 324         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 325                 return;
 326         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 327         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 328         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 329         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 330                     vc->vc_size_row * nr);
 331 }
 332
 333 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 334 {
 335         unsigned short *s;
 336         unsigned int step;
 337
 338         if (t+nr >= b)
 339                 nr = b - t - 1;
 340         if (b > vc->vc_rows || t >= b || nr < 1)
 341                 return;
 342         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 343                 return;
 344         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 345         step = vc->vc_cols * nr;
 346         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 347         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 348 }
 349
 350 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 351 {
 352 #ifndef VT_BUF_VRAM_ONLY
 353         unsigned int xx, yy, offset;
 354         u16 *p;
 355
 356         p = (u16 *) start;
 357         if (!vc->vc_sw->con_getxy) {
 358                 offset = (start - vc->vc_origin) / 2;
 359                 xx = offset % vc->vc_cols;
 360                 yy = offset / vc->vc_cols;
 361         } else {
 362                 int nxx, nyy;
 363                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 364                 xx = nxx; yy = nyy;
 365         }
 366         for(;;) {
 367                 u16 attrib = scr_readw(p) & 0xff00;
 368                 int startx = xx;
 369                 u16 *q = p;
 370                 while (xx < vc->vc_cols && count) {
 371                         if (attrib != (scr_readw(p) & 0xff00)) {
 372                                 if (p > q)
 373                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 374                                 startx = xx;
 375                                 q = p;
 376                                 attrib = scr_readw(p) & 0xff00;
 377                         }
 378                         p++;
 379                         xx++;
 380                         count--;
 381                 }
 382                 if (p > q)
 383                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 384                 if (!count)
 385                         break;
 386                 xx = 0;
 387                 yy++;
 388                 if (vc->vc_sw->con_getxy) {
 389                         p = (u16 *)start;
 390                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 391                 }
 392         }
 393 #endif
 394 }
 395
 396 void update_region(struct vc_data *vc, unsigned long start, int count)
 397 {
 398         WARN_CONSOLE_UNLOCKED();
 399
 400         if (DO_UPDATE(vc)) {
 401                 hide_cursor(vc);
 402                 do_update_region(vc, start, count);
 403                 set_cursor(vc);
 404         }
 405 }
 406
 407 /* Structure of attributes is hardware-dependent */
 408
 409 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 410     u8 _underline, u8 _reverse, u8 _italic)
 411 {
 412         if (vc->vc_sw->con_build_attr)
 413                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 414                        _blink, _underline, _reverse, _italic);
 415
 416 #ifndef VT_BUF_VRAM_ONLY
 417 /*
 418  * ++roman: I completely changed the attribute format for monochrome
 419  * mode (!can_do_color). The formerly used MDA (monochrome display
 420  * adapter) format didn't allow the combination of certain effects.
 421  * Now the attribute is just a bit vector:
 422  *  Bit 0..1: intensity (0..2)
 423  *  Bit 2   : underline
 424  *  Bit 3   : reverse
 425  *  Bit 7   : blink
 426  */
 427         {
 428         u8 a = _color;
 429         if (!vc->vc_can_do_color)
 430                 return _intensity |
 431                        (_italic ? 2 : 0) |
 432                        (_underline ? 4 : 0) |
 433                        (_reverse ? 8 : 0) |
 434                        (_blink ? 0x80 : 0);
 435         if (_italic)
 436                 a = (a & 0xF0) | vc->vc_itcolor;
 437         else if (_underline)
 438                 a = (a & 0xf0) | vc->vc_ulcolor;
 439         else if (_intensity == 0)
 440                 a = (a & 0xf0) | vc->vc_ulcolor;
 441         if (_reverse)
 442                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 443         if (_blink)
 444                 a ^= 0x80;
 445         if (_intensity == 2)
 446                 a ^= 0x08;
 447         if (vc->vc_hi_font_mask == 0x100)
 448                 a <<= 1;
 449         return a;
 450         }
 451 #else
 452         return 0;
 453 #endif
 454 }
 455
 456 static void update_attr(struct vc_data *vc)
 457 {
 458         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 459                       vc->vc_blink, vc->vc_underline,
 460                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 461         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 462 }
 463
 464 /* Note: inverting the screen twice should revert to the original state */
 465 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 466 {
 467         unsigned short *p;
 468
 469         WARN_CONSOLE_UNLOCKED();
 470
 471         count /= 2;
 472         p = screenpos(vc, offset, viewed);
 473         if (vc->vc_sw->con_invert_region)
 474                 vc->vc_sw->con_invert_region(vc, p, count);
 475 #ifndef VT_BUF_VRAM_ONLY
 476         else {
 477                 u16 *q = p;
 478                 int cnt = count;
 479                 u16 a;
 480
 481                 if (!vc->vc_can_do_color) {
 482                         while (cnt--) {
 483                             a = scr_readw(q);
 484                             a ^= 0x0800;
 485                             scr_writew(a, q);
 486                             q++;
 487                         }
 488                 } else if (vc->vc_hi_font_mask == 0x100) {
 489                         while (cnt--) {
 490                                 a = scr_readw(q);
 491                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 492                                 scr_writew(a, q);
 493                                 q++;
 494                         }
 495                 } else {
 496                         while (cnt--) {
 497                                 a = scr_readw(q);
 498                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 499                                 scr_writew(a, q);
 500                                 q++;
 501                         }
 502                 }
 503         }
 504 #endif
 505         if (DO_UPDATE(vc))
 506                 do_update_region(vc, (unsigned long) p, count);
 507         notify_update(vc);
 508 }
 509
 510 /* used by selection: complement pointer position */
 511 void complement_pos(struct vc_data *vc, int offset)
 512 {
 513         static int old_offset = -1;
 514         static unsigned short old;
 515         static unsigned short oldx, oldy;
 516
 517         WARN_CONSOLE_UNLOCKED();
 518
 519         if (old_offset != -1 && old_offset >= 0 &&
 520             old_offset < vc->vc_screenbuf_size) {
 521                 scr_writew(old, screenpos(vc, old_offset, 1));
 522                 if (DO_UPDATE(vc))
 523                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 524                 notify_update(vc);
 525         }
 526
 527         old_offset = offset;
 528
 529         if (offset != -1 && offset >= 0 &&
 530             offset < vc->vc_screenbuf_size) {
 531                 unsigned short new;
 532                 unsigned short *p;
 533                 p = screenpos(vc, offset, 1);
 534                 old = scr_readw(p);
 535                 new = old ^ vc->vc_complement_mask;
 536                 scr_writew(new, p);
 537                 if (DO_UPDATE(vc)) {
 538                         oldx = (offset >> 1) % vc->vc_cols;
 539                         oldy = (offset >> 1) / vc->vc_cols;
 540                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 541                 }
 542                 notify_update(vc);
 543         }
 544 }
 545
 546 static void insert_char(struct vc_data *vc, unsigned int nr)
 547 {
 548         unsigned short *p = (unsigned short *) vc->vc_pos;
 549
 550         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 551         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 552         vc->vc_need_wrap = 0;
 553         if (DO_UPDATE(vc))
 554                 do_update_region(vc, (unsigned long) p,
 555                         vc->vc_cols - vc->vc_x);
 556 }
 557
 558 static void delete_char(struct vc_data *vc, unsigned int nr)
 559 {
 560         unsigned short *p = (unsigned short *) vc->vc_pos;
 561
 562         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 563         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 564                         nr * 2);
 565         vc->vc_need_wrap = 0;
 566         if (DO_UPDATE(vc))
 567                 do_update_region(vc, (unsigned long) p,
 568                         vc->vc_cols - vc->vc_x);
 569 }
 570
 571 static int softcursor_original = -1;
 572
 573 static void add_softcursor(struct vc_data *vc)
 574 {
 575         int i = scr_readw((u16 *) vc->vc_pos);
 576         u32 type = vc->vc_cursor_type;
 577
 578         if (! (type & 0x10)) return;
 579         if (softcursor_original != -1) return;
 580         softcursor_original = i;
 581         i |= ((type >> 8) & 0xff00 );
 582         i ^= ((type) & 0xff00 );
 583         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 584         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 585         scr_writew(i, (u16 *) vc->vc_pos);
 586         if (DO_UPDATE(vc))
 587                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 588 }
 589
 590 static void hide_softcursor(struct vc_data *vc)
 591 {
 592         if (softcursor_original != -1) {
 593                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 594                 if (DO_UPDATE(vc))
 595                         vc->vc_sw->con_putc(vc, softcursor_original,
 596                                         vc->vc_y, vc->vc_x);
 597                 softcursor_original = -1;
 598         }
 599 }
 600
 601 static void hide_cursor(struct vc_data *vc)
 602 {
 603         if (vc == sel_cons)
 604                 clear_selection();
 605         vc->vc_sw->con_cursor(vc, CM_ERASE);
 606         hide_softcursor(vc);
 607 }
 608
 609 static void set_cursor(struct vc_data *vc)
 610 {
 611         if (!IS_FG(vc) || console_blanked ||
 612             vc->vc_mode == KD_GRAPHICS)
 613                 return;
 614         if (vc->vc_deccm) {
 615                 if (vc == sel_cons)
 616                         clear_selection();
 617                 add_softcursor(vc);
 618                 if ((vc->vc_cursor_type & 0x0f) != 1)
 619                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 620         } else
 621                 hide_cursor(vc);
 622 }
 623
 624 static void set_origin(struct vc_data *vc)
 625 {
 626         WARN_CONSOLE_UNLOCKED();
 627
 628         if (!CON_IS_VISIBLE(vc) ||
 629             !vc->vc_sw->con_set_origin ||
 630             !vc->vc_sw->con_set_origin(vc))
 631                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 632         vc->vc_visible_origin = vc->vc_origin;
 633         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 634         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 635 }
 636
 637 static void save_screen(struct vc_data *vc)
 638 {
 639         WARN_CONSOLE_UNLOCKED();
 640
 641         if (vc->vc_sw->con_save_screen)
 642                 vc->vc_sw->con_save_screen(vc);
 643 }
 644
 645 /*
 646  *      Redrawing of screen
 647  */
 648
 649 void clear_buffer_attributes(struct vc_data *vc)
 650 {
 651         unsigned short *p = (unsigned short *)vc->vc_origin;
 652         int count = vc->vc_screenbuf_size / 2;
 653         int mask = vc->vc_hi_font_mask | 0xff;
 654
 655         for (; count > 0; count--, p++) {
 656                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 657         }
 658 }
 659
 660 void redraw_screen(struct vc_data *vc, int is_switch)
 661 {
 662         int redraw = 0;
 663
 664         WARN_CONSOLE_UNLOCKED();
 665
 666         if (!vc) {
 667                 /* strange ... */
 668                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 669                 return;
 670         }
 671
 672         if (is_switch) {
 673                 struct vc_data *old_vc = vc_cons[fg_console].d;
 674                 if (old_vc == vc)
 675                         return;
 676                 if (!CON_IS_VISIBLE(vc))
 677                         redraw = 1;
 678                 *vc->vc_display_fg = vc;
 679                 fg_console = vc->vc_num;
 680                 hide_cursor(old_vc);
 681                 if (!CON_IS_VISIBLE(old_vc)) {
 682                         save_screen(old_vc);
 683                         set_origin(old_vc);
 684                 }
 685                 if (tty0dev)
 686                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 687         } else {
 688                 hide_cursor(vc);
 689                 redraw = 1;
 690         }
 691
 692         if (redraw) {
 693                 int update;
 694                 int old_was_color = vc->vc_can_do_color;
 695
 696                 set_origin(vc);
 697                 update = vc->vc_sw->con_switch(vc);
 698                 set_palette(vc);
 699                 /*
 700                  * If console changed from mono<->color, the best we can do
 701                  * is to clear the buffer attributes. As it currently stands,
 702                  * rebuilding new attributes from the old buffer is not doable
 703                  * without overly complex code.
 704                  */
 705                 if (old_was_color != vc->vc_can_do_color) {
 706                         update_attr(vc);
 707                         clear_buffer_attributes(vc);
 708                 }
 709
 710                 /* Forcibly update if we're panicing */
 711                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 712                     vt_force_oops_output(vc))
 713                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 714         }
 715         set_cursor(vc);
 716         if (is_switch) {
 717                 set_leds();
 718                 compute_shiftstate();
 719                 notify_update(vc);
 720         }
 721 }
 722
 723 /*
 724  *      Allocation, freeing and resizing of VTs.
 725  */
 726
 727 int vc_cons_allocated(unsigned int i)
 728 {
 729         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 730 }
 731
 732 static void visual_init(struct vc_data *vc, int num, int init)
 733 {
 734         /* ++Geert: vc->vc_sw->con_init determines console size */
 735         if (vc->vc_sw)
 736                 module_put(vc->vc_sw->owner);
 737         vc->vc_sw = conswitchp;
 738 #ifndef VT_SINGLE_DRIVER
 739         if (con_driver_map[num])
 740                 vc->vc_sw = con_driver_map[num];
 741 #endif
 742         __module_get(vc->vc_sw->owner);
 743         vc->vc_num = num;
 744         vc->vc_display_fg = &master_display_fg;
 745         if (vc->vc_uni_pagedir_loc)
 746                 con_free_unimap(vc);
 747         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 748         vc->vc_uni_pagedir = NULL;
 749         vc->vc_hi_font_mask = 0;
 750         vc->vc_complement_mask = 0;
 751         vc->vc_can_do_color = 0;
 752         vc->vc_panic_force_write = false;
 753         vc->vc_sw->con_init(vc, init);
 754         if (!vc->vc_complement_mask)
 755                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 756         vc->vc_s_complement_mask = vc->vc_complement_mask;
 757         vc->vc_size_row = vc->vc_cols << 1;
 758         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 759 }
 760
 761 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 762 {
 763         struct vt_notifier_param param;
 764         struct vc_data *vc;
 765
 766         WARN_CONSOLE_UNLOCKED();
 767
 768         if (currcons >= MAX_NR_CONSOLES)
 769                 return -ENXIO;
 770
 771         if (vc_cons[currcons].d)
 772                 return 0;
 773
 774         /* due to the granularity of kmalloc, we waste some memory here */
 775         /* the alloc is done in two steps, to optimize the common situation
 776            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 777         /* although the numbers above are not valid since long ago, the
 778            point is still up-to-date and the comment still has its value
 779            even if only as a historical artifact.  --mj, July 1998 */
 780         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 781         if (!vc)
 782                 return -ENOMEM;
 783
 784         vc_cons[currcons].d = vc;
 785         tty_port_init(&vc->port);
 786         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 787
 788         visual_init(vc, currcons, 1);
 789
 790         if (!*vc->vc_uni_pagedir_loc)
 791                 con_set_default_unimap(vc);
 792
 793         vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 794         if (!vc->vc_screenbuf)
 795                 goto err_free;
 796
 797         /* If no drivers have overridden us and the user didn't pass a
 798            boot option, default to displaying the cursor */
 799         if (global_cursor_default == -1)
 800                 global_cursor_default = 1;
 801
 802         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 803         vcs_make_sysfs(currcons);
 804         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 805
 806         return 0;
 807 err_free:
 808         kfree(vc);
 809         vc_cons[currcons].d = NULL;
 810         return -ENOMEM;
 811 }
 812
 813 static inline int resize_screen(struct vc_data *vc, int width, int height,
 814                                 int user)
 815 {
 816         /* Resizes the resolution of the display adapater */
 817         int err = 0;
 818
 819         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 820                 err = vc->vc_sw->con_resize(vc, width, height, user);
 821
 822         return err;
 823 }
 824
 825 /*
 826  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 827  * [this is to be used together with some user program
 828  * like resize that changes the hardware videomode]
 829  */
 830 #define VC_RESIZE_MAXCOL (32767)
 831 #define VC_RESIZE_MAXROW (32767)
 832
 833 /**
 834  *      vc_do_resize    -       resizing method for the tty
 835  *      @tty: tty being resized
 836  *      @real_tty: real tty (different to tty if a pty/tty pair)
 837  *      @vc: virtual console private data
 838  *      @cols: columns
 839  *      @lines: lines
 840  *
 841  *      Resize a virtual console, clipping according to the actual constraints.
 842  *      If the caller passes a tty structure then update the termios winsize
 843  *      information and perform any necessary signal handling.
 844  *
 845  *      Caller must hold the console semaphore. Takes the termios rwsem and
 846  *      ctrl_lock of the tty IFF a tty is passed.
 847  */
 848
 849 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 850                                 unsigned int cols, unsigned int lines)
 851 {
 852         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 853         unsigned long end;
 854         unsigned int old_rows, old_row_size;
 855         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 856         unsigned int user;
 857         unsigned short *newscreen;
 858
 859         WARN_CONSOLE_UNLOCKED();
 860
 861         if (!vc)
 862                 return -ENXIO;
 863
 864         user = vc->vc_resize_user;
 865         vc->vc_resize_user = 0;
 866
 867         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 868                 return -EINVAL;
 869
 870         new_cols = (cols ? cols : vc->vc_cols);
 871         new_rows = (lines ? lines : vc->vc_rows);
 872         new_row_size = new_cols << 1;
 873         new_screen_size = new_row_size * new_rows;
 874
 875         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 876                 return 0;
 877
 878         newscreen = kmalloc(new_screen_size, GFP_USER);
 879         if (!newscreen)
 880                 return -ENOMEM;
 881
 882         old_rows = vc->vc_rows;
 883         old_row_size = vc->vc_size_row;
 884
 885         err = resize_screen(vc, new_cols, new_rows, user);
 886         if (err) {
 887                 kfree(newscreen);
 888                 return err;
 889         }
 890
 891         vc->vc_rows = new_rows;
 892         vc->vc_cols = new_cols;
 893         vc->vc_size_row = new_row_size;
 894         vc->vc_screenbuf_size = new_screen_size;
 895
 896         rlth = min(old_row_size, new_row_size);
 897         rrem = new_row_size - rlth;
 898         old_origin = vc->vc_origin;
 899         new_origin = (long) newscreen;
 900         new_scr_end = new_origin + new_screen_size;
 901
 902         if (vc->vc_y > new_rows) {
 903                 if (old_rows - vc->vc_y < new_rows) {
 904                         /*
 905                          * Cursor near the bottom, copy contents from the
 906                          * bottom of buffer
 907                          */
 908                         old_origin += (old_rows - new_rows) * old_row_size;
 909                 } else {
 910                         /*
 911                          * Cursor is in no man's land, copy 1/2 screenful
 912                          * from the top and bottom of cursor position
 913                          */
 914                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 915                 }
 916         }
 917
 918         end = old_origin + old_row_size * min(old_rows, new_rows);
 919
 920         update_attr(vc);
 921
 922         while (old_origin < end) {
 923                 scr_memcpyw((unsigned short *) new_origin,
 924                             (unsigned short *) old_origin, rlth);
 925                 if (rrem)
 926                         scr_memsetw((void *)(new_origin + rlth),
 927                                     vc->vc_video_erase_char, rrem);
 928                 old_origin += old_row_size;
 929                 new_origin += new_row_size;
 930         }
 931         if (new_scr_end > new_origin)
 932                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 933                             new_scr_end - new_origin);
 934         kfree(vc->vc_screenbuf);
 935         vc->vc_screenbuf = newscreen;
 936         vc->vc_screenbuf_size = new_screen_size;
 937         set_origin(vc);
 938
 939         /* do part of a reset_terminal() */
 940         vc->vc_top = 0;
 941         vc->vc_bottom = vc->vc_rows;
 942         gotoxy(vc, vc->vc_x, vc->vc_y);
 943         save_cur(vc);
 944
 945         if (tty) {
 946                 /* Rewrite the requested winsize data with the actual
 947                    resulting sizes */
 948                 struct winsize ws;
 949                 memset(&ws, 0, sizeof(ws));
 950                 ws.ws_row = vc->vc_rows;
 951                 ws.ws_col = vc->vc_cols;
 952                 ws.ws_ypixel = vc->vc_scan_lines;
 953                 tty_do_resize(tty, &ws);
 954         }
 955
 956         if (CON_IS_VISIBLE(vc))
 957                 update_screen(vc);
 958         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 959         return err;
 960 }
 961
 962 /**
 963  *      vc_resize               -       resize a VT
 964  *      @vc: virtual console
 965  *      @cols: columns
 966  *      @rows: rows
 967  *
 968  *      Resize a virtual console as seen from the console end of things. We
 969  *      use the common vc_do_resize methods to update the structures. The
 970  *      caller must hold the console sem to protect console internals and
 971  *      vc->port.tty
 972  */
 973
 974 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 975 {
 976         return vc_do_resize(vc->port.tty, vc, cols, rows);
 977 }
 978
 979 /**
 980  *      vt_resize               -       resize a VT
 981  *      @tty: tty to resize
 982  *      @ws: winsize attributes
 983  *
 984  *      Resize a virtual terminal. This is called by the tty layer as we
 985  *      register our own handler for resizing. The mutual helper does all
 986  *      the actual work.
 987  *
 988  *      Takes the console sem and the called methods then take the tty
 989  *      termios_rwsem and the tty ctrl_lock in that order.
 990  */
 991 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 992 {
 993         struct vc_data *vc = tty->driver_data;
 994         int ret;
 995
 996         console_lock();
 997         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 998         console_unlock();
 999         return ret;
1000 }
1001
1002 struct vc_data *vc_deallocate(unsigned int currcons)
1003 {
1004         struct vc_data *vc = NULL;
1005
1006         WARN_CONSOLE_UNLOCKED();
1007
1008         if (vc_cons_allocated(currcons)) {
1009                 struct vt_notifier_param param;
1010
1011                 param.vc = vc = vc_cons[currcons].d;
1012                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1013                 vcs_remove_sysfs(currcons);
1014                 vc->vc_sw->con_deinit(vc);
1015                 put_pid(vc->vt_pid);
1016                 module_put(vc->vc_sw->owner);
1017                 kfree(vc->vc_screenbuf);
1018                 vc_cons[currcons].d = NULL;
1019         }
1020         return vc;
1021 }
1022
1023 /*
1024  *      VT102 emulator
1025  */
1026
1027 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1028 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1029 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1030
1031 #define decarm          VC_REPEAT
1032 #define decckm          VC_CKMODE
1033 #define kbdapplic       VC_APPLIC
1034 #define lnm             VC_CRLF
1035
1036 /*
1037  * this is what the terminal answers to a ESC-Z or csi0c query.
1038  */
1039 #define VT100ID "\033[?1;2c"
1040 #define VT102ID "\033[?6c"
1041
1042 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1043                                        8,12,10,14, 9,13,11,15 };
1044
1045 /* the default colour table, for VGA+ colour systems */
1046 unsigned char default_red[] = {
1047         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1048         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1049 };
1050 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1051
1052 unsigned char default_grn[] = {
1053         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1054         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1055 };
1056 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1057
1058 unsigned char default_blu[] = {
1059         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1060         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1061 };
1062 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1063
1064 /*
1065  * gotoxy() must verify all boundaries, because the arguments
1066  * might also be negative. If the given position is out of
1067  * bounds, the cursor is placed at the nearest margin.
1068  */
1069 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1070 {
1071         int min_y, max_y;
1072
1073         if (new_x < 0)
1074                 vc->vc_x = 0;
1075         else {
1076                 if (new_x >= vc->vc_cols)
1077                         vc->vc_x = vc->vc_cols - 1;
1078                 else
1079                         vc->vc_x = new_x;
1080         }
1081
1082         if (vc->vc_decom) {
1083                 min_y = vc->vc_top;
1084                 max_y = vc->vc_bottom;
1085         } else {
1086                 min_y = 0;
1087                 max_y = vc->vc_rows;
1088         }
1089         if (new_y < min_y)
1090                 vc->vc_y = min_y;
1091         else if (new_y >= max_y)
1092                 vc->vc_y = max_y - 1;
1093         else
1094                 vc->vc_y = new_y;
1095         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1096         vc->vc_need_wrap = 0;
1097 }
1098
1099 /* for absolute user moves, when decom is set */
1100 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1101 {
1102         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1103 }
1104
1105 void scrollback(struct vc_data *vc, int lines)
1106 {
1107         if (!lines)
1108                 lines = vc->vc_rows / 2;
1109         scrolldelta(-lines);
1110 }
1111
1112 void scrollfront(struct vc_data *vc, int lines)
1113 {
1114         if (!lines)
1115                 lines = vc->vc_rows / 2;
1116         scrolldelta(lines);
1117 }
1118
1119 static void lf(struct vc_data *vc)
1120 {
1121         /* don't scroll if above bottom of scrolling region, or
1122          * if below scrolling region
1123          */
1124         if (vc->vc_y + 1 == vc->vc_bottom)
1125                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1126         else if (vc->vc_y < vc->vc_rows - 1) {
1127                 vc->vc_y++;
1128                 vc->vc_pos += vc->vc_size_row;
1129         }
1130         vc->vc_need_wrap = 0;
1131         notify_write(vc, '\n');
1132 }
1133
1134 static void ri(struct vc_data *vc)
1135 {
1136         /* don't scroll if below top of scrolling region, or
1137          * if above scrolling region
1138          */
1139         if (vc->vc_y == vc->vc_top)
1140                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1141         else if (vc->vc_y > 0) {
1142                 vc->vc_y--;
1143                 vc->vc_pos -= vc->vc_size_row;
1144         }
1145         vc->vc_need_wrap = 0;
1146 }
1147
1148 static inline void cr(struct vc_data *vc)
1149 {
1150         vc->vc_pos -= vc->vc_x << 1;
1151         vc->vc_need_wrap = vc->vc_x = 0;
1152         notify_write(vc, '\r');
1153 }
1154
1155 static inline void bs(struct vc_data *vc)
1156 {
1157         if (vc->vc_x) {
1158                 vc->vc_pos -= 2;
1159                 vc->vc_x--;
1160                 vc->vc_need_wrap = 0;
1161                 notify_write(vc, '\b');
1162         }
1163 }
1164
1165 static inline void del(struct vc_data *vc)
1166 {
1167         /* ignored */
1168 }
1169
1170 static void csi_J(struct vc_data *vc, int vpar)
1171 {
1172         unsigned int count;
1173         unsigned short * start;
1174
1175         switch (vpar) {
1176                 case 0: /* erase from cursor to end of display */
1177                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1178                         start = (unsigned short *)vc->vc_pos;
1179                         break;
1180                 case 1: /* erase from start to cursor */
1181                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1182                         start = (unsigned short *)vc->vc_origin;
1183                         break;
1184                 case 3: /* erase scroll-back buffer (and whole display) */
1185                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1186                                     vc->vc_screenbuf_size >> 1);
1187                         set_origin(vc);
1188                         if (CON_IS_VISIBLE(vc))
1189                                 update_screen(vc);
1190                         /* fall through */
1191                 case 2: /* erase whole display */
1192                         count = vc->vc_cols * vc->vc_rows;
1193                         start = (unsigned short *)vc->vc_origin;
1194                         break;
1195                 default:
1196                         return;
1197         }
1198         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1199         if (DO_UPDATE(vc))
1200                 do_update_region(vc, (unsigned long) start, count);
1201         vc->vc_need_wrap = 0;
1202 }
1203
1204 static void csi_K(struct vc_data *vc, int vpar)
1205 {
1206         unsigned int count;
1207         unsigned short * start;
1208
1209         switch (vpar) {
1210                 case 0: /* erase from cursor to end of line */
1211                         count = vc->vc_cols - vc->vc_x;
1212                         start = (unsigned short *)vc->vc_pos;
1213                         break;
1214                 case 1: /* erase from start of line to cursor */
1215                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216                         count = vc->vc_x + 1;
1217                         break;
1218                 case 2: /* erase whole line */
1219                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1220                         count = vc->vc_cols;
1221                         break;
1222                 default:
1223                         return;
1224         }
1225         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1226         vc->vc_need_wrap = 0;
1227         if (DO_UPDATE(vc))
1228                 do_update_region(vc, (unsigned long) start, count);
1229 }
1230
1231 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1232 {                                         /* not vt100? */
1233         int count;
1234
1235         if (!vpar)
1236                 vpar++;
1237         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1238
1239         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1240         if (DO_UPDATE(vc))
1241                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1242         vc->vc_need_wrap = 0;
1243 }
1244
1245 static void default_attr(struct vc_data *vc)
1246 {
1247         vc->vc_intensity = 1;
1248         vc->vc_italic = 0;
1249         vc->vc_underline = 0;
1250         vc->vc_reverse = 0;
1251         vc->vc_blink = 0;
1252         vc->vc_color = vc->vc_def_color;
1253 }
1254
1255 struct rgb { u8 r; u8 g; u8 b; };
1256
1257 static struct rgb rgb_from_256(int i)
1258 {
1259         struct rgb c;
1260         if (i < 8) {            /* Standard colours. */
1261                 c.r = i&1 ? 0xaa : 0x00;
1262                 c.g = i&2 ? 0xaa : 0x00;
1263                 c.b = i&4 ? 0xaa : 0x00;
1264         } else if (i < 16) {
1265                 c.r = i&1 ? 0xff : 0x55;
1266                 c.g = i&2 ? 0xff : 0x55;
1267                 c.b = i&4 ? 0xff : 0x55;
1268         } else if (i < 232) {   /* 6x6x6 colour cube. */
1269                 c.r = (i - 16) / 36 * 85 / 2;
1270                 c.g = (i - 16) / 6 % 6 * 85 / 2;
1271                 c.b = (i - 16) % 6 * 85 / 2;
1272         } else                  /* Grayscale ramp. */
1273                 c.r = c.g = c.b = i * 10 - 2312;
1274         return c;
1275 }
1276
1277 static void rgb_foreground(struct vc_data *vc, struct rgb c)
1278 {
1279         u8 hue, max = c.r;
1280         if (c.g > max)
1281                 max = c.g;
1282         if (c.b > max)
1283                 max = c.b;
1284         hue = (c.r > max/2 ? 4 : 0)
1285             | (c.g > max/2 ? 2 : 0)
1286             | (c.b > max/2 ? 1 : 0);
1287         if (hue == 7 && max <= 0x55)
1288                 hue = 0, vc->vc_intensity = 2;
1289         else
1290                 vc->vc_intensity = (max > 0xaa) + 1;
1291         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1292 }
1293
1294 static void rgb_background(struct vc_data *vc, struct rgb c)
1295 {
1296         /* For backgrounds, err on the dark side. */
1297         vc->vc_color = (vc->vc_color & 0x0f)
1298                 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1299 }
1300
1301 /* console_lock is held */
1302 static void csi_m(struct vc_data *vc)
1303 {
1304         int i;
1305
1306         for (i = 0; i <= vc->vc_npar; i++)
1307                 switch (vc->vc_par[i]) {
1308                         case 0: /* all attributes off */
1309                                 default_attr(vc);
1310                                 break;
1311                         case 1:
1312                                 vc->vc_intensity = 2;
1313                                 break;
1314                         case 2:
1315                                 vc->vc_intensity = 0;
1316                                 break;
1317                         case 3:
1318                                 vc->vc_italic = 1;
1319                                 break;
1320                         case 4:
1321                                 vc->vc_underline = 1;
1322                                 break;
1323                         case 5:
1324                                 vc->vc_blink = 1;
1325                                 break;
1326                         case 7:
1327                                 vc->vc_reverse = 1;
1328                                 break;
1329                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1330                                   * Select primary font, don't display
1331                                   * control chars if defined, don't set
1332                                   * bit 8 on output.
1333                                   */
1334                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1335                                                 ? vc->vc_G0_charset
1336                                                 : vc->vc_G1_charset, vc);
1337                                 vc->vc_disp_ctrl = 0;
1338                                 vc->vc_toggle_meta = 0;
1339                                 break;
1340                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1341                                   * Select first alternate font, lets
1342                                   * chars < 32 be displayed as ROM chars.
1343                                   */
1344                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1345                                 vc->vc_disp_ctrl = 1;
1346                                 vc->vc_toggle_meta = 0;
1347                                 break;
1348                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1349                                   * Select second alternate font, toggle
1350                                   * high bit before displaying as ROM char.
1351                                   */
1352                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1353                                 vc->vc_disp_ctrl = 1;
1354                                 vc->vc_toggle_meta = 1;
1355                                 break;
1356                         case 21:
1357                         case 22:
1358                                 vc->vc_intensity = 1;
1359                                 break;
1360                         case 23:
1361                                 vc->vc_italic = 0;
1362                                 break;
1363                         case 24:
1364                                 vc->vc_underline = 0;
1365                                 break;
1366                         case 25:
1367                                 vc->vc_blink = 0;
1368                                 break;
1369                         case 27:
1370                                 vc->vc_reverse = 0;
1371                                 break;
1372                         case 38: /* ITU T.416
1373                                   * Higher colour modes.
1374                                   * They break the usual properties of SGR codes
1375                                   * and thus need to be detected and ignored by
1376                                   * hand.  Strictly speaking, that standard also
1377                                   * wants : rather than ; as separators, contrary
1378                                   * to ECMA-48, but no one produces such codes
1379                                   * and almost no one accepts them.
1380                                   */
1381                                 i++;
1382                                 if (i > vc->vc_npar)
1383                                         break;
1384                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1385                                     i < vc->vc_npar) {     /* ubiquitous */
1386                                         i++;
1387                                         rgb_foreground(vc,
1388                                                 rgb_from_256(vc->vc_par[i]));
1389                                 } else if (vc->vc_par[i] == 2 &&  /* 24 bit */
1390                                            i <= vc->vc_npar + 3) {/* extremely rare */
1391                                         struct rgb c = {
1392                                                 .r = vc->vc_par[i + 1],
1393                                                 .g = vc->vc_par[i + 2],
1394                                                 .b = vc->vc_par[i + 3],
1395                                         };
1396                                         rgb_foreground(vc, c);
1397                                         i += 3;
1398                                 }
1399                                 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1400                                  * there's no point in supporting them.
1401                                  */
1402                                 break;
1403                         case 48:
1404                                 i++;
1405                                 if (i > vc->vc_npar)
1406                                         break;
1407                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1408                                     i < vc->vc_npar) {
1409                                         i++;
1410                                         rgb_background(vc,
1411                                                 rgb_from_256(vc->vc_par[i]));
1412                                 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1413                                            i <= vc->vc_npar + 3) {
1414                                         struct rgb c = {
1415                                                 .r = vc->vc_par[i + 1],
1416                                                 .g = vc->vc_par[i + 2],
1417                                                 .b = vc->vc_par[i + 3],
1418                                         };
1419                                         rgb_background(vc, c);
1420                                         i += 3;
1421                                 }
1422                                 break;
1423                         case 39:
1424                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1425                                 break;
1426                         case 49:
1427                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1428                                 break;
1429                         default:
1430                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1431                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1432                                                 | (vc->vc_color & 0xf0);
1433                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1434                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1435                                                 | (vc->vc_color & 0x0f);
1436                                 break;
1437                 }
1438         update_attr(vc);
1439 }
1440
1441 static void respond_string(const char *p, struct tty_port *port)
1442 {
1443         while (*p) {
1444                 tty_insert_flip_char(port, *p, 0);
1445                 p++;
1446         }
1447         tty_schedule_flip(port);
1448 }
1449
1450 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1451 {
1452         char buf[40];
1453
1454         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1455         respond_string(buf, tty->port);
1456 }
1457
1458 static inline void status_report(struct tty_struct *tty)
1459 {
1460         respond_string("\033[0n", tty->port);   /* Terminal ok */
1461 }
1462
1463 static inline void respond_ID(struct tty_struct *tty)
1464 {
1465         respond_string(VT102ID, tty->port);
1466 }
1467
1468 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1469 {
1470         char buf[8];
1471
1472         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1473                 (char)('!' + mry));
1474         respond_string(buf, tty->port);
1475 }
1476
1477 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1478 int mouse_reporting(void)
1479 {
1480         return vc_cons[fg_console].d->vc_report_mouse;
1481 }
1482
1483 /* console_lock is held */
1484 static void set_mode(struct vc_data *vc, int on_off)
1485 {
1486         int i;
1487
1488         for (i = 0; i <= vc->vc_npar; i++)
1489                 if (vc->vc_ques) {
1490                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1491                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1492                                 if (on_off)
1493                                         set_kbd(vc, decckm);
1494                                 else
1495                                         clr_kbd(vc, decckm);
1496                                 break;
1497                         case 3: /* 80/132 mode switch unimplemented */
1498                                 vc->vc_deccolm = on_off;
1499 #if 0
1500                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1501                                 /* this alone does not suffice; some user mode
1502                                    utility has to change the hardware regs */
1503 #endif
1504                                 break;
1505                         case 5:                 /* Inverted screen on/off */
1506                                 if (vc->vc_decscnm != on_off) {
1507                                         vc->vc_decscnm = on_off;
1508                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1509                                         update_attr(vc);
1510                                 }
1511                                 break;
1512                         case 6:                 /* Origin relative/absolute */
1513                                 vc->vc_decom = on_off;
1514                                 gotoxay(vc, 0, 0);
1515                                 break;
1516                         case 7:                 /* Autowrap on/off */
1517                                 vc->vc_decawm = on_off;
1518                                 break;
1519                         case 8:                 /* Autorepeat on/off */
1520                                 if (on_off)
1521                                         set_kbd(vc, decarm);
1522                                 else
1523                                         clr_kbd(vc, decarm);
1524                                 break;
1525                         case 9:
1526                                 vc->vc_report_mouse = on_off ? 1 : 0;
1527                                 break;
1528                         case 25:                /* Cursor on/off */
1529                                 vc->vc_deccm = on_off;
1530                                 break;
1531                         case 1000:
1532                                 vc->vc_report_mouse = on_off ? 2 : 0;
1533                                 break;
1534                         }
1535                 } else {
1536                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1537                         case 3:                 /* Monitor (display ctrls) */
1538                                 vc->vc_disp_ctrl = on_off;
1539                                 break;
1540                         case 4:                 /* Insert Mode on/off */
1541                                 vc->vc_decim = on_off;
1542                                 break;
1543                         case 20:                /* Lf, Enter == CrLf/Lf */
1544                                 if (on_off)
1545                                         set_kbd(vc, lnm);
1546                                 else
1547                                         clr_kbd(vc, lnm);
1548                                 break;
1549                         }
1550                 }
1551 }
1552
1553 /* console_lock is held */
1554 static void setterm_command(struct vc_data *vc)
1555 {
1556         switch(vc->vc_par[0]) {
1557                 case 1: /* set color for underline mode */
1558                         if (vc->vc_can_do_color &&
1559                                         vc->vc_par[1] < 16) {
1560                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1561                                 if (vc->vc_underline)
1562                                         update_attr(vc);
1563                         }
1564                         break;
1565                 case 2: /* set color for half intensity mode */
1566                         if (vc->vc_can_do_color &&
1567                                         vc->vc_par[1] < 16) {
1568                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1569                                 if (vc->vc_intensity == 0)
1570                                         update_attr(vc);
1571                         }
1572                         break;
1573                 case 8: /* store colors as defaults */
1574                         vc->vc_def_color = vc->vc_attr;
1575                         if (vc->vc_hi_font_mask == 0x100)
1576                                 vc->vc_def_color >>= 1;
1577                         default_attr(vc);
1578                         update_attr(vc);
1579                         break;
1580                 case 9: /* set blanking interval */
1581                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1582                         poke_blanked_console();
1583                         break;
1584                 case 10: /* set bell frequency in Hz */
1585                         if (vc->vc_npar >= 1)
1586                                 vc->vc_bell_pitch = vc->vc_par[1];
1587                         else
1588                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1589                         break;
1590                 case 11: /* set bell duration in msec */
1591                         if (vc->vc_npar >= 1)
1592                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1593                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1594                         else
1595                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1596                         break;
1597                 case 12: /* bring specified console to the front */
1598                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1599                                 set_console(vc->vc_par[1] - 1);
1600                         break;
1601                 case 13: /* unblank the screen */
1602                         poke_blanked_console();
1603                         break;
1604                 case 14: /* set vesa powerdown interval */
1605                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1606                         break;
1607                 case 15: /* activate the previous console */
1608                         set_console(last_console);
1609                         break;
1610                 case 16: /* set cursor blink duration in msec */
1611                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1612                                         vc->vc_par[1] <= USHRT_MAX)
1613                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1614                         else
1615                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1616                         break;
1617         }
1618 }
1619
1620 /* console_lock is held */
1621 static void csi_at(struct vc_data *vc, unsigned int nr)
1622 {
1623         if (nr > vc->vc_cols - vc->vc_x)
1624                 nr = vc->vc_cols - vc->vc_x;
1625         else if (!nr)
1626                 nr = 1;
1627         insert_char(vc, nr);
1628 }
1629
1630 /* console_lock is held */
1631 static void csi_L(struct vc_data *vc, unsigned int nr)
1632 {
1633         if (nr > vc->vc_rows - vc->vc_y)
1634                 nr = vc->vc_rows - vc->vc_y;
1635         else if (!nr)
1636                 nr = 1;
1637         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1638         vc->vc_need_wrap = 0;
1639 }
1640
1641 /* console_lock is held */
1642 static void csi_P(struct vc_data *vc, unsigned int nr)
1643 {
1644         if (nr > vc->vc_cols - vc->vc_x)
1645                 nr = vc->vc_cols - vc->vc_x;
1646         else if (!nr)
1647                 nr = 1;
1648         delete_char(vc, nr);
1649 }
1650
1651 /* console_lock is held */
1652 static void csi_M(struct vc_data *vc, unsigned int nr)
1653 {
1654         if (nr > vc->vc_rows - vc->vc_y)
1655                 nr = vc->vc_rows - vc->vc_y;
1656         else if (!nr)
1657                 nr=1;
1658         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1659         vc->vc_need_wrap = 0;
1660 }
1661
1662 /* console_lock is held (except via vc_init->reset_terminal */
1663 static void save_cur(struct vc_data *vc)
1664 {
1665         vc->vc_saved_x          = vc->vc_x;
1666         vc->vc_saved_y          = vc->vc_y;
1667         vc->vc_s_intensity      = vc->vc_intensity;
1668         vc->vc_s_italic         = vc->vc_italic;
1669         vc->vc_s_underline      = vc->vc_underline;
1670         vc->vc_s_blink          = vc->vc_blink;
1671         vc->vc_s_reverse        = vc->vc_reverse;
1672         vc->vc_s_charset        = vc->vc_charset;
1673         vc->vc_s_color          = vc->vc_color;
1674         vc->vc_saved_G0         = vc->vc_G0_charset;
1675         vc->vc_saved_G1         = vc->vc_G1_charset;
1676 }
1677
1678 /* console_lock is held */
1679 static void restore_cur(struct vc_data *vc)
1680 {
1681         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1682         vc->vc_intensity        = vc->vc_s_intensity;
1683         vc->vc_italic           = vc->vc_s_italic;
1684         vc->vc_underline        = vc->vc_s_underline;
1685         vc->vc_blink            = vc->vc_s_blink;
1686         vc->vc_reverse          = vc->vc_s_reverse;
1687         vc->vc_charset          = vc->vc_s_charset;
1688         vc->vc_color            = vc->vc_s_color;
1689         vc->vc_G0_charset       = vc->vc_saved_G0;
1690         vc->vc_G1_charset       = vc->vc_saved_G1;
1691         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1692         update_attr(vc);
1693         vc->vc_need_wrap = 0;
1694 }
1695
1696 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1697         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1698         ESpalette, ESosc };
1699
1700 /* console_lock is held (except via vc_init()) */
1701 static void reset_terminal(struct vc_data *vc, int do_clear)
1702 {
1703         vc->vc_top              = 0;
1704         vc->vc_bottom           = vc->vc_rows;
1705         vc->vc_state            = ESnormal;
1706         vc->vc_ques             = 0;
1707         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1708         vc->vc_G0_charset       = LAT1_MAP;
1709         vc->vc_G1_charset       = GRAF_MAP;
1710         vc->vc_charset          = 0;
1711         vc->vc_need_wrap        = 0;
1712         vc->vc_report_mouse     = 0;
1713         vc->vc_utf              = default_utf8;
1714         vc->vc_utf_count        = 0;
1715
1716         vc->vc_disp_ctrl        = 0;
1717         vc->vc_toggle_meta      = 0;
1718
1719         vc->vc_decscnm          = 0;
1720         vc->vc_decom            = 0;
1721         vc->vc_decawm           = 1;
1722         vc->vc_deccm            = global_cursor_default;
1723         vc->vc_decim            = 0;
1724
1725         vt_reset_keyboard(vc->vc_num);
1726
1727         vc->vc_cursor_type = cur_default;
1728         vc->vc_complement_mask = vc->vc_s_complement_mask;
1729
1730         default_attr(vc);
1731         update_attr(vc);
1732
1733         vc->vc_tab_stop[0]      = 0x01010100;
1734         vc->vc_tab_stop[1]      =
1735         vc->vc_tab_stop[2]      =
1736         vc->vc_tab_stop[3]      =
1737         vc->vc_tab_stop[4]      =
1738         vc->vc_tab_stop[5]      =
1739         vc->vc_tab_stop[6]      =
1740         vc->vc_tab_stop[7]      = 0x01010101;
1741
1742         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1743         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1744         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1745
1746         gotoxy(vc, 0, 0);
1747         save_cur(vc);
1748         if (do_clear)
1749             csi_J(vc, 2);
1750 }
1751
1752 /* console_lock is held */
1753 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1754 {
1755         /*
1756          *  Control characters can be used in the _middle_
1757          *  of an escape sequence.
1758          */
1759         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1760                 return;
1761         switch (c) {
1762         case 0:
1763                 return;
1764         case 7:
1765                 if (vc->vc_state == ESosc)
1766                         vc->vc_state = ESnormal;
1767                 else if (vc->vc_bell_duration)
1768                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1769                 return;
1770         case 8:
1771                 bs(vc);
1772                 return;
1773         case 9:
1774                 vc->vc_pos -= (vc->vc_x << 1);
1775                 while (vc->vc_x < vc->vc_cols - 1) {
1776                         vc->vc_x++;
1777                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1778                                 break;
1779                 }
1780                 vc->vc_pos += (vc->vc_x << 1);
1781                 notify_write(vc, '\t');
1782                 return;
1783         case 10: case 11: case 12:
1784                 lf(vc);
1785                 if (!is_kbd(vc, lnm))
1786                         return;
1787         case 13:
1788                 cr(vc);
1789                 return;
1790         case 14:
1791                 vc->vc_charset = 1;
1792                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1793                 vc->vc_disp_ctrl = 1;
1794                 return;
1795         case 15:
1796                 vc->vc_charset = 0;
1797                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1798                 vc->vc_disp_ctrl = 0;
1799                 return;
1800         case 24: case 26:
1801                 vc->vc_state = ESnormal;
1802                 return;
1803         case 27:
1804                 vc->vc_state = ESesc;
1805                 return;
1806         case 127:
1807                 del(vc);
1808                 return;
1809         case 128+27:
1810                 vc->vc_state = ESsquare;
1811                 return;
1812         }
1813         switch(vc->vc_state) {
1814         case ESesc:
1815                 vc->vc_state = ESnormal;
1816                 switch (c) {
1817                 case '[':
1818                         vc->vc_state = ESsquare;
1819                         return;
1820                 case ']':
1821                         vc->vc_state = ESnonstd;
1822                         return;
1823                 case '%':
1824                         vc->vc_state = ESpercent;
1825                         return;
1826                 case 'E':
1827                         cr(vc);
1828                         lf(vc);
1829                         return;
1830                 case 'M':
1831                         ri(vc);
1832                         return;
1833                 case 'D':
1834                         lf(vc);
1835                         return;
1836                 case 'H':
1837                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1838                         return;
1839                 case 'Z':
1840                         respond_ID(tty);
1841                         return;
1842                 case '7':
1843                         save_cur(vc);
1844                         return;
1845                 case '8':
1846                         restore_cur(vc);
1847                         return;
1848                 case '(':
1849                         vc->vc_state = ESsetG0;
1850                         return;
1851                 case ')':
1852                         vc->vc_state = ESsetG1;
1853                         return;
1854                 case '#':
1855                         vc->vc_state = EShash;
1856                         return;
1857                 case 'c':
1858                         reset_terminal(vc, 1);
1859                         return;
1860                 case '>':  /* Numeric keypad */
1861                         clr_kbd(vc, kbdapplic);
1862                         return;
1863                 case '=':  /* Appl. keypad */
1864                         set_kbd(vc, kbdapplic);
1865                         return;
1866                 }
1867                 return;
1868         case ESnonstd:
1869                 if (c=='P') {   /* palette escape sequence */
1870                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1871                                 vc->vc_par[vc->vc_npar] = 0;
1872                         vc->vc_npar = 0;
1873                         vc->vc_state = ESpalette;
1874                         return;
1875                 } else if (c=='R') {   /* reset palette */
1876                         reset_palette(vc);
1877                         vc->vc_state = ESnormal;
1878                 } else if (c>='0' && c<='9')
1879                         vc->vc_state = ESosc;
1880                 else
1881                         vc->vc_state = ESnormal;
1882                 return;
1883         case ESpalette:
1884                 if (isxdigit(c)) {
1885                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1886                         if (vc->vc_npar == 7) {
1887                                 int i = vc->vc_par[0] * 3, j = 1;
1888                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1889                                 vc->vc_palette[i++] += vc->vc_par[j++];
1890                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1891                                 vc->vc_palette[i++] += vc->vc_par[j++];
1892                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1893                                 vc->vc_palette[i] += vc->vc_par[j];
1894                                 set_palette(vc);
1895                                 vc->vc_state = ESnormal;
1896                         }
1897                 } else
1898                         vc->vc_state = ESnormal;
1899                 return;
1900         case ESsquare:
1901                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1902                         vc->vc_par[vc->vc_npar] = 0;
1903                 vc->vc_npar = 0;
1904                 vc->vc_state = ESgetpars;
1905                 if (c == '[') { /* Function key */
1906                         vc->vc_state=ESfunckey;
1907                         return;
1908                 }
1909                 vc->vc_ques = (c == '?');
1910                 if (vc->vc_ques)
1911                         return;
1912         case ESgetpars:
1913                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1914                         vc->vc_npar++;
1915                         return;
1916                 } else if (c>='0' && c<='9') {
1917                         vc->vc_par[vc->vc_npar] *= 10;
1918                         vc->vc_par[vc->vc_npar] += c - '0';
1919                         return;
1920                 }
1921                 vc->vc_state = ESnormal;
1922                 switch(c) {
1923                 case 'h':
1924                         set_mode(vc, 1);
1925                         return;
1926                 case 'l':
1927                         set_mode(vc, 0);
1928                         return;
1929                 case 'c':
1930                         if (vc->vc_ques) {
1931                                 if (vc->vc_par[0])
1932                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1933                                 else
1934                                         vc->vc_cursor_type = cur_default;
1935                                 return;
1936                         }
1937                         break;
1938                 case 'm':
1939                         if (vc->vc_ques) {
1940                                 clear_selection();
1941                                 if (vc->vc_par[0])
1942                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1943                                 else
1944                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1945                                 return;
1946                         }
1947                         break;
1948                 case 'n':
1949                         if (!vc->vc_ques) {
1950                                 if (vc->vc_par[0] == 5)
1951                                         status_report(tty);
1952                                 else if (vc->vc_par[0] == 6)
1953                                         cursor_report(vc, tty);
1954                         }
1955                         return;
1956                 }
1957                 if (vc->vc_ques) {
1958                         vc->vc_ques = 0;
1959                         return;
1960                 }
1961                 switch(c) {
1962                 case 'G': case '`':
1963                         if (vc->vc_par[0])
1964                                 vc->vc_par[0]--;
1965                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1966                         return;
1967                 case 'A':
1968                         if (!vc->vc_par[0])
1969                                 vc->vc_par[0]++;
1970                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1971                         return;
1972                 case 'B': case 'e':
1973                         if (!vc->vc_par[0])
1974                                 vc->vc_par[0]++;
1975                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1976                         return;
1977                 case 'C': case 'a':
1978                         if (!vc->vc_par[0])
1979                                 vc->vc_par[0]++;
1980                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1981                         return;
1982                 case 'D':
1983                         if (!vc->vc_par[0])
1984                                 vc->vc_par[0]++;
1985                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1986                         return;
1987                 case 'E':
1988                         if (!vc->vc_par[0])
1989                                 vc->vc_par[0]++;
1990                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1991                         return;
1992                 case 'F':
1993                         if (!vc->vc_par[0])
1994                                 vc->vc_par[0]++;
1995                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1996                         return;
1997                 case 'd':
1998                         if (vc->vc_par[0])
1999                                 vc->vc_par[0]--;
2000                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2001                         return;
2002                 case 'H': case 'f':
2003                         if (vc->vc_par[0])
2004                                 vc->vc_par[0]--;
2005                         if (vc->vc_par[1])
2006                                 vc->vc_par[1]--;
2007                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2008                         return;
2009                 case 'J':
2010                         csi_J(vc, vc->vc_par[0]);
2011                         return;
2012                 case 'K':
2013                         csi_K(vc, vc->vc_par[0]);
2014                         return;
2015                 case 'L':
2016                         csi_L(vc, vc->vc_par[0]);
2017                         return;
2018                 case 'M':
2019                         csi_M(vc, vc->vc_par[0]);
2020                         return;
2021                 case 'P':
2022                         csi_P(vc, vc->vc_par[0]);
2023                         return;
2024                 case 'c':
2025                         if (!vc->vc_par[0])
2026                                 respond_ID(tty);
2027                         return;
2028                 case 'g':
2029                         if (!vc->vc_par[0])
2030                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2031                         else if (vc->vc_par[0] == 3) {
2032                                 vc->vc_tab_stop[0] =
2033                                         vc->vc_tab_stop[1] =
2034                                         vc->vc_tab_stop[2] =
2035                                         vc->vc_tab_stop[3] =
2036                                         vc->vc_tab_stop[4] =
2037                                         vc->vc_tab_stop[5] =
2038                                         vc->vc_tab_stop[6] =
2039                                         vc->vc_tab_stop[7] = 0;
2040                         }
2041                         return;
2042                 case 'm':
2043                         csi_m(vc);
2044                         return;
2045                 case 'q': /* DECLL - but only 3 leds */
2046                         /* map 0,1,2,3 to 0,1,2,4 */
2047                         if (vc->vc_par[0] < 4)
2048                                 vt_set_led_state(vc->vc_num,
2049                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2050                         return;
2051                 case 'r':
2052                         if (!vc->vc_par[0])
2053                                 vc->vc_par[0]++;
2054                         if (!vc->vc_par[1])
2055                                 vc->vc_par[1] = vc->vc_rows;
2056                         /* Minimum allowed region is 2 lines */
2057                         if (vc->vc_par[0] < vc->vc_par[1] &&
2058                             vc->vc_par[1] <= vc->vc_rows) {
2059                                 vc->vc_top = vc->vc_par[0] - 1;
2060                                 vc->vc_bottom = vc->vc_par[1];
2061                                 gotoxay(vc, 0, 0);
2062                         }
2063                         return;
2064                 case 's':
2065                         save_cur(vc);
2066                         return;
2067                 case 'u':
2068                         restore_cur(vc);
2069                         return;
2070                 case 'X':
2071                         csi_X(vc, vc->vc_par[0]);
2072                         return;
2073                 case '@':
2074                         csi_at(vc, vc->vc_par[0]);
2075                         return;
2076                 case ']': /* setterm functions */
2077                         setterm_command(vc);
2078                         return;
2079                 }
2080                 return;
2081         case ESpercent:
2082                 vc->vc_state = ESnormal;
2083                 switch (c) {
2084                 case '@':  /* defined in ISO 2022 */
2085                         vc->vc_utf = 0;
2086                         return;
2087                 case 'G':  /* prelim official escape code */
2088                 case '8':  /* retained for compatibility */
2089                         vc->vc_utf = 1;
2090                         return;
2091                 }
2092                 return;
2093         case ESfunckey:
2094                 vc->vc_state = ESnormal;
2095                 return;
2096         case EShash:
2097                 vc->vc_state = ESnormal;
2098                 if (c == '8') {
2099                         /* DEC screen alignment test. kludge :-) */
2100                         vc->vc_video_erase_char =
2101                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2102                         csi_J(vc, 2);
2103                         vc->vc_video_erase_char =
2104                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2105                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2106                 }
2107                 return;
2108         case ESsetG0:
2109                 if (c == '0')
2110                         vc->vc_G0_charset = GRAF_MAP;
2111                 else if (c == 'B')
2112                         vc->vc_G0_charset = LAT1_MAP;
2113                 else if (c == 'U')
2114                         vc->vc_G0_charset = IBMPC_MAP;
2115                 else if (c == 'K')
2116                         vc->vc_G0_charset = USER_MAP;
2117                 if (vc->vc_charset == 0)
2118                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2119                 vc->vc_state = ESnormal;
2120                 return;
2121         case ESsetG1:
2122                 if (c == '0')
2123                         vc->vc_G1_charset = GRAF_MAP;
2124                 else if (c == 'B')
2125                         vc->vc_G1_charset = LAT1_MAP;
2126                 else if (c == 'U')
2127                         vc->vc_G1_charset = IBMPC_MAP;
2128                 else if (c == 'K')
2129                         vc->vc_G1_charset = USER_MAP;
2130                 if (vc->vc_charset == 1)
2131                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2132                 vc->vc_state = ESnormal;
2133                 return;
2134         case ESosc:
2135                 return;
2136         default:
2137                 vc->vc_state = ESnormal;
2138         }
2139 }
2140
2141 /* is_double_width() is based on the wcwidth() implementation by
2142  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2143  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2144  */
2145 struct interval {
2146         uint32_t first;
2147         uint32_t last;
2148 };
2149
2150 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2151 {
2152         int min = 0;
2153         int mid;
2154
2155         if (ucs < table[0].first || ucs > table[max].last)
2156                 return 0;
2157         while (max >= min) {
2158                 mid = (min + max) / 2;
2159                 if (ucs > table[mid].last)
2160                         min = mid + 1;
2161                 else if (ucs < table[mid].first)
2162                         max = mid - 1;
2163                 else
2164                         return 1;
2165         }
2166         return 0;
2167 }
2168
2169 static int is_double_width(uint32_t ucs)
2170 {
2171         static const struct interval double_width[] = {
2172                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2173                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2174                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2175                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2176         };
2177         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2178 }
2179
2180 /* acquires console_lock */
2181 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2182 {
2183 #ifdef VT_BUF_VRAM_ONLY
2184 #define FLUSH do { } while(0);
2185 #else
2186 #define FLUSH if (draw_x >= 0) { \
2187         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2188         draw_x = -1; \
2189         }
2190 #endif
2191
2192         int c, tc, ok, n = 0, draw_x = -1;
2193         unsigned int currcons;
2194         unsigned long draw_from = 0, draw_to = 0;
2195         struct vc_data *vc;
2196         unsigned char vc_attr;
2197         struct vt_notifier_param param;
2198         uint8_t rescan;
2199         uint8_t inverse;
2200         uint8_t width;
2201         u16 himask, charmask;
2202
2203         if (in_interrupt())
2204                 return count;
2205
2206         might_sleep();
2207
2208         console_lock();
2209         vc = tty->driver_data;
2210         if (vc == NULL) {
2211                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2212                 console_unlock();
2213                 return 0;
2214         }
2215
2216         currcons = vc->vc_num;
2217         if (!vc_cons_allocated(currcons)) {
2218                 /* could this happen? */
2219                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2220                 console_unlock();
2221                 return 0;
2222         }
2223
2224         himask = vc->vc_hi_font_mask;
2225         charmask = himask ? 0x1ff : 0xff;
2226
2227         /* undraw cursor first */
2228         if (IS_FG(vc))
2229                 hide_cursor(vc);
2230
2231         param.vc = vc;
2232
2233         while (!tty->stopped && count) {
2234                 int orig = *buf;
2235                 c = orig;
2236                 buf++;
2237                 n++;
2238                 count--;
2239                 rescan = 0;
2240                 inverse = 0;
2241                 width = 1;
2242
2243                 /* Do no translation at all in control states */
2244                 if (vc->vc_state != ESnormal) {
2245                         tc = c;
2246                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2247                     /* Combine UTF-8 into Unicode in vc_utf_char.
2248                      * vc_utf_count is the number of continuation bytes still
2249                      * expected to arrive.
2250                      * vc_npar is the number of continuation bytes arrived so
2251                      * far
2252                      */
2253 rescan_last_byte:
2254                     if ((c & 0xc0) == 0x80) {
2255                         /* Continuation byte received */
2256                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2257                         if (vc->vc_utf_count) {
2258                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2259                             vc->vc_npar++;
2260                             if (--vc->vc_utf_count) {
2261                                 /* Still need some bytes */
2262                                 continue;
2263                             }
2264                             /* Got a whole character */
2265                             c = vc->vc_utf_char;
2266                             /* Reject overlong sequences */
2267                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2268                                         c > utf8_length_changes[vc->vc_npar])
2269                                 c = 0xfffd;
2270                         } else {
2271                             /* Unexpected continuation byte */
2272                             vc->vc_utf_count = 0;
2273                             c = 0xfffd;
2274                         }
2275                     } else {
2276                         /* Single ASCII byte or first byte of a sequence received */
2277                         if (vc->vc_utf_count) {
2278                             /* Continuation byte expected */
2279                             rescan = 1;
2280                             vc->vc_utf_count = 0;
2281                             c = 0xfffd;
2282                         } else if (c > 0x7f) {
2283                             /* First byte of a multibyte sequence received */
2284                             vc->vc_npar = 0;
2285                             if ((c & 0xe0) == 0xc0) {
2286                                 vc->vc_utf_count = 1;
2287                                 vc->vc_utf_char = (c & 0x1f);
2288                             } else if ((c & 0xf0) == 0xe0) {
2289                                 vc->vc_utf_count = 2;
2290                                 vc->vc_utf_char = (c & 0x0f);
2291                             } else if ((c & 0xf8) == 0xf0) {
2292                                 vc->vc_utf_count = 3;
2293                                 vc->vc_utf_char = (c & 0x07);
2294                             } else if ((c & 0xfc) == 0xf8) {
2295                                 vc->vc_utf_count = 4;
2296                                 vc->vc_utf_char = (c & 0x03);
2297                             } else if ((c & 0xfe) == 0xfc) {
2298                                 vc->vc_utf_count = 5;
2299                                 vc->vc_utf_char = (c & 0x01);
2300                             } else {
2301                                 /* 254 and 255 are invalid */
2302                                 c = 0xfffd;
2303                             }
2304                             if (vc->vc_utf_count) {
2305                                 /* Still need some bytes */
2306                                 continue;
2307                             }
2308                         }
2309                         /* Nothing to do if an ASCII byte was received */
2310                     }
2311                     /* End of UTF-8 decoding. */
2312                     /* c is the received character, or U+FFFD for invalid sequences. */
2313                     /* Replace invalid Unicode code points with U+FFFD too */
2314                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2315                         c = 0xfffd;
2316                     tc = c;
2317                 } else {        /* no utf or alternate charset mode */
2318                     tc = vc_translate(vc, c);
2319                 }
2320
2321                 param.c = tc;
2322                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2323                                         &param) == NOTIFY_STOP)
2324                         continue;
2325
2326                 /* If the original code was a control character we
2327                  * only allow a glyph to be displayed if the code is
2328                  * not normally used (such as for cursor movement) or
2329                  * if the disp_ctrl mode has been explicitly enabled.
2330                  * Certain characters (as given by the CTRL_ALWAYS
2331                  * bitmap) are always displayed as control characters,
2332                  * as the console would be pretty useless without
2333                  * them; to display an arbitrary font position use the
2334                  * direct-to-font zone in UTF-8 mode.
2335                  */
2336                 ok = tc && (c >= 32 ||
2337                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2338                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2339                         && (c != 127 || vc->vc_disp_ctrl)
2340                         && (c != 128+27);
2341
2342                 if (vc->vc_state == ESnormal && ok) {
2343                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2344                                 if (is_double_width(c))
2345                                         width = 2;
2346                         }
2347                         /* Now try to find out how to display it */
2348                         tc = conv_uni_to_pc(vc, tc);
2349                         if (tc & ~charmask) {
2350                                 if (tc == -1 || tc == -2) {
2351                                     continue; /* nothing to display */
2352                                 }
2353                                 /* Glyph not found */
2354                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2355                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2356                                        This would make absolutely no sense with Unicode in mind,
2357                                        but do this for ASCII characters since a font may lack
2358                                        Unicode mapping info and we don't want to end up with
2359                                        having question marks only. */
2360                                     tc = c;
2361                                 } else {
2362                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2363                                     tc = conv_uni_to_pc(vc, 0xfffd);
2364                                     if (tc < 0) {
2365                                         inverse = 1;
2366                                         tc = conv_uni_to_pc(vc, '?');
2367                                         if (tc < 0) tc = '?';
2368                                     }
2369                                 }
2370                         }
2371
2372                         if (!inverse) {
2373                                 vc_attr = vc->vc_attr;
2374                         } else {
2375                                 /* invert vc_attr */
2376                                 if (!vc->vc_can_do_color) {
2377                                         vc_attr = (vc->vc_attr) ^ 0x08;
2378                                 } else if (vc->vc_hi_font_mask == 0x100) {
2379                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2380                                 } else {
2381                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2382                                 }
2383                                 FLUSH
2384                         }
2385
2386                         while (1) {
2387                                 if (vc->vc_need_wrap || vc->vc_decim)
2388                                         FLUSH
2389                                 if (vc->vc_need_wrap) {
2390                                         cr(vc);
2391                                         lf(vc);
2392                                 }
2393                                 if (vc->vc_decim)
2394                                         insert_char(vc, 1);
2395                                 scr_writew(himask ?
2396                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2397                                              (vc_attr << 8) + tc,
2398                                            (u16 *) vc->vc_pos);
2399                                 if (DO_UPDATE(vc) && draw_x < 0) {
2400                                         draw_x = vc->vc_x;
2401                                         draw_from = vc->vc_pos;
2402                                 }
2403                                 if (vc->vc_x == vc->vc_cols - 1) {
2404                                         vc->vc_need_wrap = vc->vc_decawm;
2405                                         draw_to = vc->vc_pos + 2;
2406                                 } else {
2407                                         vc->vc_x++;
2408                                         draw_to = (vc->vc_pos += 2);
2409                                 }
2410
2411                                 if (!--width) break;
2412
2413                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2414                                 if (tc < 0) tc = ' ';
2415                         }
2416                         notify_write(vc, c);
2417
2418                         if (inverse) {
2419                                 FLUSH
2420                         }
2421
2422                         if (rescan) {
2423                                 rescan = 0;
2424                                 inverse = 0;
2425                                 width = 1;
2426                                 c = orig;
2427                                 goto rescan_last_byte;
2428                         }
2429                         continue;
2430                 }
2431                 FLUSH
2432                 do_con_trol(tty, vc, orig);
2433         }
2434         FLUSH
2435         console_conditional_schedule();
2436         console_unlock();
2437         notify_update(vc);
2438         return n;
2439 #undef FLUSH
2440 }
2441
2442 /*
2443  * This is the console switching callback.
2444  *
2445  * Doing console switching in a process context allows
2446  * us to do the switches asynchronously (needed when we want
2447  * to switch due to a keyboard interrupt).  Synchronization
2448  * with other console code and prevention of re-entrancy is
2449  * ensured with console_lock.
2450  */
2451 static void console_callback(struct work_struct *ignored)
2452 {
2453         console_lock();
2454
2455         if (want_console >= 0) {
2456                 if (want_console != fg_console &&
2457                     vc_cons_allocated(want_console)) {
2458                         hide_cursor(vc_cons[fg_console].d);
2459                         change_console(vc_cons[want_console].d);
2460                         /* we only changed when the console had already
2461                            been allocated - a new console is not created
2462                            in an interrupt routine */
2463                 }
2464                 want_console = -1;
2465         }
2466         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2467                 do_poke_blanked_console = 0;
2468                 poke_blanked_console();
2469         }
2470         if (scrollback_delta) {
2471                 struct vc_data *vc = vc_cons[fg_console].d;
2472                 clear_selection();
2473                 if (vc->vc_mode == KD_TEXT)
2474                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2475                 scrollback_delta = 0;
2476         }
2477         if (blank_timer_expired) {
2478                 do_blank_screen(0);
2479                 blank_timer_expired = 0;
2480         }
2481         notify_update(vc_cons[fg_console].d);
2482
2483         console_unlock();
2484 }
2485
2486 int set_console(int nr)
2487 {
2488         struct vc_data *vc = vc_cons[fg_console].d;
2489
2490         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2491                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2492
2493                 /*
2494                  * Console switch will fail in console_callback() or
2495                  * change_console() so there is no point scheduling
2496                  * the callback
2497                  *
2498                  * Existing set_console() users don't check the return
2499                  * value so this shouldn't break anything
2500                  */
2501                 return -EINVAL;
2502         }
2503
2504         want_console = nr;
2505         schedule_console_callback();
2506
2507         return 0;
2508 }
2509
2510 struct tty_driver *console_driver;
2511
2512 #ifdef CONFIG_VT_CONSOLE
2513
2514 /**
2515  * vt_kmsg_redirect() - Sets/gets the kernel message console
2516  * @new:        The new virtual terminal number or -1 if the console should stay
2517  *              unchanged
2518  *
2519  * By default, the kernel messages are always printed on the current virtual
2520  * console. However, the user may modify that default with the
2521  * TIOCL_SETKMSGREDIRECT ioctl call.
2522  *
2523  * This function sets the kernel message console to be @new. It returns the old
2524  * virtual console number. The virtual terminal number 0 (both as parameter and
2525  * return value) means no redirection (i.e. always printed on the currently
2526  * active console).
2527  *
2528  * The parameter -1 means that only the current console is returned, but the
2529  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2530  * case to make the code more understandable.
2531  *
2532  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2533  * the parameter and always returns 0.
2534  */
2535 int vt_kmsg_redirect(int new)
2536 {
2537         static int kmsg_con;
2538
2539         if (new != -1)
2540                 return xchg(&kmsg_con, new);
2541         else
2542                 return kmsg_con;
2543 }
2544
2545 /*
2546  *      Console on virtual terminal
2547  *
2548  * The console must be locked when we get here.
2549  */
2550
2551 static void vt_console_print(struct console *co, const char *b, unsigned count)
2552 {
2553         struct vc_data *vc = vc_cons[fg_console].d;
2554         unsigned char c;
2555         static DEFINE_SPINLOCK(printing_lock);
2556         const ushort *start;
2557         ushort cnt = 0;
2558         ushort myx;
2559         int kmsg_console;
2560
2561         /* console busy or not yet initialized */
2562         if (!printable)
2563                 return;
2564         if (!spin_trylock(&printing_lock))
2565                 return;
2566
2567         kmsg_console = vt_get_kmsg_redirect();
2568         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2569                 vc = vc_cons[kmsg_console - 1].d;
2570
2571         /* read `x' only after setting currcons properly (otherwise
2572            the `x' macro will read the x of the foreground console). */
2573         myx = vc->vc_x;
2574
2575         if (!vc_cons_allocated(fg_console)) {
2576                 /* impossible */
2577                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2578                 goto quit;
2579         }
2580
2581         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2582                 goto quit;
2583
2584         /* undraw cursor first */
2585         if (IS_FG(vc))
2586                 hide_cursor(vc);
2587
2588         start = (ushort *)vc->vc_pos;
2589
2590         /* Contrived structure to try to emulate original need_wrap behaviour
2591          * Problems caused when we have need_wrap set on '\n' character */
2592         while (count--) {
2593                 c = *b++;
2594                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2595                         if (cnt > 0) {
2596                                 if (CON_IS_VISIBLE(vc))
2597                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2598                                 vc->vc_x += cnt;
2599                                 if (vc->vc_need_wrap)
2600                                         vc->vc_x--;
2601                                 cnt = 0;
2602                         }
2603                         if (c == 8) {           /* backspace */
2604                                 bs(vc);
2605                                 start = (ushort *)vc->vc_pos;
2606                                 myx = vc->vc_x;
2607                                 continue;
2608                         }
2609                         if (c != 13)
2610                                 lf(vc);
2611                         cr(vc);
2612                         start = (ushort *)vc->vc_pos;
2613                         myx = vc->vc_x;
2614                         if (c == 10 || c == 13)
2615                                 continue;
2616                 }
2617                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2618                 notify_write(vc, c);
2619                 cnt++;
2620                 if (myx == vc->vc_cols - 1) {
2621                         vc->vc_need_wrap = 1;
2622                         continue;
2623                 }
2624                 vc->vc_pos += 2;
2625                 myx++;
2626         }
2627         if (cnt > 0) {
2628                 if (CON_IS_VISIBLE(vc))
2629                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2630                 vc->vc_x += cnt;
2631                 if (vc->vc_x == vc->vc_cols) {
2632                         vc->vc_x--;
2633                         vc->vc_need_wrap = 1;
2634                 }
2635         }
2636         set_cursor(vc);
2637         notify_update(vc);
2638
2639 quit:
2640         spin_unlock(&printing_lock);
2641 }
2642
2643 static struct tty_driver *vt_console_device(struct console *c, int *index)
2644 {
2645         *index = c->index ? c->index-1 : fg_console;
2646         return console_driver;
2647 }
2648
2649 static struct console vt_console_driver = {
2650         .name           = "tty",
2651         .write          = vt_console_print,
2652         .device         = vt_console_device,
2653         .unblank        = unblank_screen,
2654         .flags          = CON_PRINTBUFFER,
2655         .index          = -1,
2656 };
2657 #endif
2658
2659 /*
2660  *      Handling of Linux-specific VC ioctls
2661  */
2662
2663 /*
2664  * Generally a bit racy with respect to console_lock();.
2665  *
2666  * There are some functions which don't need it.
2667  *
2668  * There are some functions which can sleep for arbitrary periods
2669  * (paste_selection) but we don't need the lock there anyway.
2670  *
2671  * set_selection has locking, and definitely needs it
2672  */
2673
2674 int tioclinux(struct tty_struct *tty, unsigned long arg)
2675 {
2676         char type, data;
2677         char __user *p = (char __user *)arg;
2678         int lines;
2679         int ret;
2680
2681         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2682                 return -EPERM;
2683         if (get_user(type, p))
2684                 return -EFAULT;
2685         ret = 0;
2686
2687         switch (type)
2688         {
2689                 case TIOCL_SETSEL:
2690                         console_lock();
2691                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2692                         console_unlock();
2693                         break;
2694                 case TIOCL_PASTESEL:
2695                         ret = paste_selection(tty);
2696                         break;
2697                 case TIOCL_UNBLANKSCREEN:
2698                         console_lock();
2699                         unblank_screen();
2700                         console_unlock();
2701                         break;
2702                 case TIOCL_SELLOADLUT:
2703                         console_lock();
2704                         ret = sel_loadlut(p);
2705                         console_unlock();
2706                         break;
2707                 case TIOCL_GETSHIFTSTATE:
2708
2709         /*
2710          * Make it possible to react to Shift+Mousebutton.
2711          * Note that 'shift_state' is an undocumented
2712          * kernel-internal variable; programs not closely
2713          * related to the kernel should not use this.
2714          */
2715                         data = vt_get_shift_state();
2716                         ret = __put_user(data, p);
2717                         break;
2718                 case TIOCL_GETMOUSEREPORTING:
2719                         console_lock(); /* May be overkill */
2720                         data = mouse_reporting();
2721                         console_unlock();
2722                         ret = __put_user(data, p);
2723                         break;
2724                 case TIOCL_SETVESABLANK:
2725                         console_lock();
2726                         ret = set_vesa_blanking(p);
2727                         console_unlock();
2728                         break;
2729                 case TIOCL_GETKMSGREDIRECT:
2730                         data = vt_get_kmsg_redirect();
2731                         ret = __put_user(data, p);
2732                         break;
2733                 case TIOCL_SETKMSGREDIRECT:
2734                         if (!capable(CAP_SYS_ADMIN)) {
2735                                 ret = -EPERM;
2736                         } else {
2737                                 if (get_user(data, p+1))
2738                                         ret = -EFAULT;
2739                                 else
2740                                         vt_kmsg_redirect(data);
2741                         }
2742                         break;
2743                 case TIOCL_GETFGCONSOLE:
2744                         /* No locking needed as this is a transiently
2745                            correct return anyway if the caller hasn't
2746                            disabled switching */
2747                         ret = fg_console;
2748                         break;
2749                 case TIOCL_SCROLLCONSOLE:
2750                         if (get_user(lines, (s32 __user *)(p+4))) {
2751                                 ret = -EFAULT;
2752                         } else {
2753                                 /* Need the console lock here. Note that lots
2754                                    of other calls need fixing before the lock
2755                                    is actually useful ! */
2756                                 console_lock();
2757                                 scrollfront(vc_cons[fg_console].d, lines);
2758                                 console_unlock();
2759                                 ret = 0;
2760                         }
2761                         break;
2762                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2763                         console_lock();
2764                         ignore_poke = 1;
2765                         do_blank_screen(0);
2766                         console_unlock();
2767                         break;
2768                 case TIOCL_BLANKEDSCREEN:
2769                         ret = console_blanked;
2770                         break;
2771                 default:
2772                         ret = -EINVAL;
2773                         break;
2774         }
2775         return ret;
2776 }
2777
2778 /*
2779  * /dev/ttyN handling
2780  */
2781
2782 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2783 {
2784         int     retval;
2785
2786         retval = do_con_write(tty, buf, count);
2787         con_flush_chars(tty);
2788
2789         return retval;
2790 }
2791
2792 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2793 {
2794         if (in_interrupt())
2795                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2796         return do_con_write(tty, &ch, 1);
2797 }
2798
2799 static int con_write_room(struct tty_struct *tty)
2800 {
2801         if (tty->stopped)
2802                 return 0;
2803         return 32768;           /* No limit, really; we're not buffering */
2804 }
2805
2806 static int con_chars_in_buffer(struct tty_struct *tty)
2807 {
2808         return 0;               /* we're not buffering */
2809 }
2810
2811 /*
2812  * con_throttle and con_unthrottle are only used for
2813  * paste_selection(), which has to stuff in a large number of
2814  * characters...
2815  */
2816 static void con_throttle(struct tty_struct *tty)
2817 {
2818 }
2819
2820 static void con_unthrottle(struct tty_struct *tty)
2821 {
2822         struct vc_data *vc = tty->driver_data;
2823
2824         wake_up_interruptible(&vc->paste_wait);
2825 }
2826
2827 /*
2828  * Turn the Scroll-Lock LED on when the tty is stopped
2829  */
2830 static void con_stop(struct tty_struct *tty)
2831 {
2832         int console_num;
2833         if (!tty)
2834                 return;
2835         console_num = tty->index;
2836         if (!vc_cons_allocated(console_num))
2837                 return;
2838         vt_kbd_con_stop(console_num);
2839 }
2840
2841 /*
2842  * Turn the Scroll-Lock LED off when the console is started
2843  */
2844 static void con_start(struct tty_struct *tty)
2845 {
2846         int console_num;
2847         if (!tty)
2848                 return;
2849         console_num = tty->index;
2850         if (!vc_cons_allocated(console_num))
2851                 return;
2852         vt_kbd_con_start(console_num);
2853 }
2854
2855 static void con_flush_chars(struct tty_struct *tty)
2856 {
2857         struct vc_data *vc;
2858
2859         if (in_interrupt())     /* from flush_to_ldisc */
2860                 return;
2861
2862         /* if we race with con_close(), vt may be null */
2863         console_lock();
2864         vc = tty->driver_data;
2865         if (vc)
2866                 set_cursor(vc);
2867         console_unlock();
2868 }
2869
2870 /*
2871  * Allocate the console screen memory.
2872  */
2873 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2874 {
2875         unsigned int currcons = tty->index;
2876         struct vc_data *vc;
2877         int ret;
2878
2879         console_lock();
2880         ret = vc_allocate(currcons);
2881         if (ret)
2882                 goto unlock;
2883
2884         vc = vc_cons[currcons].d;
2885
2886         /* Still being freed */
2887         if (vc->port.tty) {
2888                 ret = -ERESTARTSYS;
2889                 goto unlock;
2890         }
2891
2892         ret = tty_port_install(&vc->port, driver, tty);
2893         if (ret)
2894                 goto unlock;
2895
2896         tty->driver_data = vc;
2897         vc->port.tty = tty;
2898
2899         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2900                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2901                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2902         }
2903         if (vc->vc_utf)
2904                 tty->termios.c_iflag |= IUTF8;
2905         else
2906                 tty->termios.c_iflag &= ~IUTF8;
2907 unlock:
2908         console_unlock();
2909         return ret;
2910 }
2911
2912 static int con_open(struct tty_struct *tty, struct file *filp)
2913 {
2914         /* everything done in install */
2915         return 0;
2916 }
2917
2918
2919 static void con_close(struct tty_struct *tty, struct file *filp)
2920 {
2921         /* Nothing to do - we defer to shutdown */
2922 }
2923
2924 static void con_shutdown(struct tty_struct *tty)
2925 {
2926         struct vc_data *vc = tty->driver_data;
2927         BUG_ON(vc == NULL);
2928         console_lock();
2929         vc->port.tty = NULL;
2930         console_unlock();
2931 }
2932
2933 static int default_color           = 7; /* white */
2934 static int default_italic_color    = 2; // green (ASCII)
2935 static int default_underline_color = 3; // cyan (ASCII)
2936 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2937 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2938 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2939
2940 static void vc_init(struct vc_data *vc, unsigned int rows,
2941                     unsigned int cols, int do_clear)
2942 {
2943         int j, k ;
2944
2945         vc->vc_cols = cols;
2946         vc->vc_rows = rows;
2947         vc->vc_size_row = cols << 1;
2948         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2949
2950         set_origin(vc);
2951         vc->vc_pos = vc->vc_origin;
2952         reset_vc(vc);
2953         for (j=k=0; j<16; j++) {
2954                 vc->vc_palette[k++] = default_red[j] ;
2955                 vc->vc_palette[k++] = default_grn[j] ;
2956                 vc->vc_palette[k++] = default_blu[j] ;
2957         }
2958         vc->vc_def_color       = default_color;
2959         vc->vc_ulcolor         = default_underline_color;
2960         vc->vc_itcolor         = default_italic_color;
2961         vc->vc_halfcolor       = 0x08;   /* grey */
2962         init_waitqueue_head(&vc->paste_wait);
2963         reset_terminal(vc, do_clear);
2964 }
2965
2966 /*
2967  * This routine initializes console interrupts, and does nothing
2968  * else. If you want the screen to clear, call tty_write with
2969  * the appropriate escape-sequence.
2970  */
2971
2972 static int __init con_init(void)
2973 {
2974         const char *display_desc = NULL;
2975         struct vc_data *vc;
2976         unsigned int currcons = 0, i;
2977
2978         console_lock();
2979
2980         if (conswitchp)
2981                 display_desc = conswitchp->con_startup();
2982         if (!display_desc) {
2983                 fg_console = 0;
2984                 console_unlock();
2985                 return 0;
2986         }
2987
2988         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2989                 struct con_driver *con_driver = &registered_con_driver[i];
2990
2991                 if (con_driver->con == NULL) {
2992                         con_driver->con = conswitchp;
2993                         con_driver->desc = display_desc;
2994                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2995                         con_driver->first = 0;
2996                         con_driver->last = MAX_NR_CONSOLES - 1;
2997                         break;
2998                 }
2999         }
3000
3001         for (i = 0; i < MAX_NR_CONSOLES; i++)
3002                 con_driver_map[i] = conswitchp;
3003
3004         if (blankinterval) {
3005                 blank_state = blank_normal_wait;
3006                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3007         }
3008
3009         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3010                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3011                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3012                 tty_port_init(&vc->port);
3013                 visual_init(vc, currcons, 1);
3014                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3015                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3016                         currcons || !vc->vc_sw->con_save_screen);
3017         }
3018         currcons = fg_console = 0;
3019         master_display_fg = vc = vc_cons[currcons].d;
3020         set_origin(vc);
3021         save_screen(vc);
3022         gotoxy(vc, vc->vc_x, vc->vc_y);
3023         csi_J(vc, 0);
3024         update_screen(vc);
3025         pr_info("Console: %s %s %dx%d\n",
3026                 vc->vc_can_do_color ? "colour" : "mono",
3027                 display_desc, vc->vc_cols, vc->vc_rows);
3028         printable = 1;
3029
3030         console_unlock();
3031
3032 #ifdef CONFIG_VT_CONSOLE
3033         register_console(&vt_console_driver);
3034 #endif
3035         return 0;
3036 }
3037 console_initcall(con_init);
3038
3039 static const struct tty_operations con_ops = {
3040         .install = con_install,
3041         .open = con_open,
3042         .close = con_close,
3043         .write = con_write,
3044         .write_room = con_write_room,
3045         .put_char = con_put_char,
3046         .flush_chars = con_flush_chars,
3047         .chars_in_buffer = con_chars_in_buffer,
3048         .ioctl = vt_ioctl,
3049 #ifdef CONFIG_COMPAT
3050         .compat_ioctl = vt_compat_ioctl,
3051 #endif
3052         .stop = con_stop,
3053         .start = con_start,
3054         .throttle = con_throttle,
3055         .unthrottle = con_unthrottle,
3056         .resize = vt_resize,
3057         .shutdown = con_shutdown
3058 };
3059
3060 static struct cdev vc0_cdev;
3061
3062 static ssize_t show_tty_active(struct device *dev,
3063                                 struct device_attribute *attr, char *buf)
3064 {
3065         return sprintf(buf, "tty%d\n", fg_console + 1);
3066 }
3067 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3068
3069 static struct attribute *vt_dev_attrs[] = {
3070         &dev_attr_active.attr,
3071         NULL
3072 };
3073
3074 ATTRIBUTE_GROUPS(vt_dev);
3075
3076 int __init vty_init(const struct file_operations *console_fops)
3077 {
3078         cdev_init(&vc0_cdev, console_fops);
3079         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3080             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3081                 panic("Couldn't register /dev/tty0 driver\n");
3082         tty0dev = device_create_with_groups(tty_class, NULL,
3083                                             MKDEV(TTY_MAJOR, 0), NULL,
3084                                             vt_dev_groups, "tty0");
3085         if (IS_ERR(tty0dev))
3086                 tty0dev = NULL;
3087
3088         vcs_init();
3089
3090         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3091         if (!console_driver)
3092                 panic("Couldn't allocate console driver\n");
3093
3094         console_driver->name = "tty";
3095         console_driver->name_base = 1;
3096         console_driver->major = TTY_MAJOR;
3097         console_driver->minor_start = 1;
3098         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3099         console_driver->init_termios = tty_std_termios;
3100         if (default_utf8)
3101                 console_driver->init_termios.c_iflag |= IUTF8;
3102         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3103         tty_set_operations(console_driver, &con_ops);
3104         if (tty_register_driver(console_driver))
3105                 panic("Couldn't register console driver\n");
3106         kbd_init();
3107         console_map_init();
3108 #ifdef CONFIG_MDA_CONSOLE
3109         mda_console_init();
3110 #endif
3111         return 0;
3112 }
3113
3114 #ifndef VT_SINGLE_DRIVER
3115
3116 static struct class *vtconsole_class;
3117
3118 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3119                            int deflt)
3120 {
3121         struct module *owner = csw->owner;
3122         const char *desc = NULL;
3123         struct con_driver *con_driver;
3124         int i, j = -1, k = -1, retval = -ENODEV;
3125
3126         if (!try_module_get(owner))
3127                 return -ENODEV;
3128
3129         WARN_CONSOLE_UNLOCKED();
3130
3131         /* check if driver is registered */
3132         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3133                 con_driver = &registered_con_driver[i];
3134
3135                 if (con_driver->con == csw) {
3136                         desc = con_driver->desc;
3137                         retval = 0;
3138                         break;
3139                 }
3140         }
3141
3142         if (retval)
3143                 goto err;
3144
3145         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3146                 csw->con_startup();
3147                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3148         }
3149
3150         if (deflt) {
3151                 if (conswitchp)
3152                         module_put(conswitchp->owner);
3153
3154                 __module_get(owner);
3155                 conswitchp = csw;
3156         }
3157
3158         first = max(first, con_driver->first);
3159         last = min(last, con_driver->last);
3160
3161         for (i = first; i <= last; i++) {
3162                 int old_was_color;
3163                 struct vc_data *vc = vc_cons[i].d;
3164
3165                 if (con_driver_map[i])
3166                         module_put(con_driver_map[i]->owner);
3167                 __module_get(owner);
3168                 con_driver_map[i] = csw;
3169
3170                 if (!vc || !vc->vc_sw)
3171                         continue;
3172
3173                 j = i;
3174
3175                 if (CON_IS_VISIBLE(vc)) {
3176                         k = i;
3177                         save_screen(vc);
3178                 }
3179
3180                 old_was_color = vc->vc_can_do_color;
3181                 vc->vc_sw->con_deinit(vc);
3182                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3183                 visual_init(vc, i, 0);
3184                 set_origin(vc);
3185                 update_attr(vc);
3186
3187                 /* If the console changed between mono <-> color, then
3188                  * the attributes in the screenbuf will be wrong.  The
3189                  * following resets all attributes to something sane.
3190                  */
3191                 if (old_was_color != vc->vc_can_do_color)
3192                         clear_buffer_attributes(vc);
3193         }
3194
3195         pr_info("Console: switching ");
3196         if (!deflt)
3197                 printk("consoles %d-%d ", first+1, last+1);
3198         if (j >= 0) {
3199                 struct vc_data *vc = vc_cons[j].d;
3200
3201                 printk("to %s %s %dx%d\n",
3202                        vc->vc_can_do_color ? "colour" : "mono",
3203                        desc, vc->vc_cols, vc->vc_rows);
3204
3205                 if (k >= 0) {
3206                         vc = vc_cons[k].d;
3207                         update_screen(vc);
3208                 }
3209         } else
3210                 printk("to %s\n", desc);
3211
3212         retval = 0;
3213 err:
3214         module_put(owner);
3215         return retval;
3216 };
3217
3218
3219 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3220 /* unlocked version of unbind_con_driver() */
3221 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3222 {
3223         struct module *owner = csw->owner;
3224         const struct consw *defcsw = NULL;
3225         struct con_driver *con_driver = NULL, *con_back = NULL;
3226         int i, retval = -ENODEV;
3227
3228         if (!try_module_get(owner))
3229                 return -ENODEV;
3230
3231         WARN_CONSOLE_UNLOCKED();
3232
3233         /* check if driver is registered and if it is unbindable */
3234         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3235                 con_driver = &registered_con_driver[i];
3236
3237                 if (con_driver->con == csw &&
3238                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3239                         retval = 0;
3240                         break;
3241                 }
3242         }
3243
3244         if (retval)
3245                 goto err;
3246
3247         retval = -ENODEV;
3248
3249         /* check if backup driver exists */
3250         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3251                 con_back = &registered_con_driver[i];
3252
3253                 if (con_back->con && con_back->con != csw) {
3254                         defcsw = con_back->con;
3255                         retval = 0;
3256                         break;
3257                 }
3258         }
3259
3260         if (retval)
3261                 goto err;
3262
3263         if (!con_is_bound(csw))
3264                 goto err;
3265
3266         first = max(first, con_driver->first);
3267         last = min(last, con_driver->last);
3268
3269         for (i = first; i <= last; i++) {
3270                 if (con_driver_map[i] == csw) {
3271                         module_put(csw->owner);
3272                         con_driver_map[i] = NULL;
3273                 }
3274         }
3275
3276         if (!con_is_bound(defcsw)) {
3277                 const struct consw *defconsw = conswitchp;
3278
3279                 defcsw->con_startup();
3280                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3281                 /*
3282                  * vgacon may change the default driver to point
3283                  * to dummycon, we restore it here...
3284                  */
3285                 conswitchp = defconsw;
3286         }
3287
3288         if (!con_is_bound(csw))
3289                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3290
3291         /* ignore return value, binding should not fail */
3292         do_bind_con_driver(defcsw, first, last, deflt);
3293 err:
3294         module_put(owner);
3295         return retval;
3296
3297 }
3298 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3299
3300 static int vt_bind(struct con_driver *con)
3301 {
3302         const struct consw *defcsw = NULL, *csw = NULL;
3303         int i, more = 1, first = -1, last = -1, deflt = 0;
3304
3305         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3306                 goto err;
3307
3308         csw = con->con;
3309
3310         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3311                 struct con_driver *con = &registered_con_driver[i];
3312
3313                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3314                         defcsw = con->con;
3315                         break;
3316                 }
3317         }
3318
3319         if (!defcsw)
3320                 goto err;
3321
3322         while (more) {
3323                 more = 0;
3324
3325                 for (i = con->first; i <= con->last; i++) {
3326                         if (con_driver_map[i] == defcsw) {
3327                                 if (first == -1)
3328                                         first = i;
3329                                 last = i;
3330                                 more = 1;
3331                         } else if (first != -1)
3332                                 break;
3333                 }
3334
3335                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3336                         deflt = 1;
3337
3338                 if (first != -1)
3339                         do_bind_con_driver(csw, first, last, deflt);
3340
3341                 first = -1;
3342                 last = -1;
3343                 deflt = 0;
3344         }
3345
3346 err:
3347         return 0;
3348 }
3349
3350 static int vt_unbind(struct con_driver *con)
3351 {
3352         const struct consw *csw = NULL;
3353         int i, more = 1, first = -1, last = -1, deflt = 0;
3354         int ret;
3355
3356         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3357                 goto err;
3358
3359         csw = con->con;
3360
3361         while (more) {
3362                 more = 0;
3363
3364                 for (i = con->first; i <= con->last; i++) {
3365                         if (con_driver_map[i] == csw) {
3366                                 if (first == -1)
3367                                         first = i;
3368                                 last = i;
3369                                 more = 1;
3370                         } else if (first != -1)
3371                                 break;
3372                 }
3373
3374                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3375                         deflt = 1;
3376
3377                 if (first != -1) {
3378                         ret = do_unbind_con_driver(csw, first, last, deflt);
3379                         if (ret != 0)
3380                                 return ret;
3381                 }
3382
3383                 first = -1;
3384                 last = -1;
3385                 deflt = 0;
3386         }
3387
3388 err:
3389         return 0;
3390 }
3391 #else
3392 static inline int vt_bind(struct con_driver *con)
3393 {
3394         return 0;
3395 }
3396 static inline int vt_unbind(struct con_driver *con)
3397 {
3398         return 0;
3399 }
3400 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3401
3402 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3403                           const char *buf, size_t count)
3404 {
3405         struct con_driver *con = dev_get_drvdata(dev);
3406         int bind = simple_strtoul(buf, NULL, 0);
3407
3408         console_lock();
3409
3410         if (bind)
3411                 vt_bind(con);
3412         else
3413                 vt_unbind(con);
3414
3415         console_unlock();
3416
3417         return count;
3418 }
3419
3420 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3421                          char *buf)
3422 {
3423         struct con_driver *con = dev_get_drvdata(dev);
3424         int bind = con_is_bound(con->con);
3425
3426         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3427 }
3428
3429 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3430                          char *buf)
3431 {
3432         struct con_driver *con = dev_get_drvdata(dev);
3433
3434         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3435                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3436                          con->desc);
3437
3438 }
3439
3440 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3441 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3442
3443 static struct attribute *con_dev_attrs[] = {
3444         &dev_attr_bind.attr,
3445         &dev_attr_name.attr,
3446         NULL
3447 };
3448
3449 ATTRIBUTE_GROUPS(con_dev);
3450
3451 static int vtconsole_init_device(struct con_driver *con)
3452 {
3453         con->flag |= CON_DRIVER_FLAG_ATTR;
3454         return 0;
3455 }
3456
3457 static void vtconsole_deinit_device(struct con_driver *con)
3458 {
3459         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3460 }
3461
3462 /**
3463  * con_is_bound - checks if driver is bound to the console
3464  * @csw: console driver
3465  *
3466  * RETURNS: zero if unbound, nonzero if bound
3467  *
3468  * Drivers can call this and if zero, they should release
3469  * all resources allocated on con_startup()
3470  */
3471 int con_is_bound(const struct consw *csw)
3472 {
3473         int i, bound = 0;
3474
3475         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3476                 if (con_driver_map[i] == csw) {
3477                         bound = 1;
3478                         break;
3479                 }
3480         }
3481
3482         return bound;
3483 }
3484 EXPORT_SYMBOL(con_is_bound);
3485
3486 /**
3487  * con_debug_enter - prepare the console for the kernel debugger
3488  * @sw: console driver
3489  *
3490  * Called when the console is taken over by the kernel debugger, this
3491  * function needs to save the current console state, then put the console
3492  * into a state suitable for the kernel debugger.
3493  *
3494  * RETURNS:
3495  * Zero on success, nonzero if a failure occurred when trying to prepare
3496  * the console for the debugger.
3497  */
3498 int con_debug_enter(struct vc_data *vc)
3499 {
3500         int ret = 0;
3501
3502         saved_fg_console = fg_console;
3503         saved_last_console = last_console;
3504         saved_want_console = want_console;
3505         saved_vc_mode = vc->vc_mode;
3506         saved_console_blanked = console_blanked;
3507         vc->vc_mode = KD_TEXT;
3508         console_blanked = 0;
3509         if (vc->vc_sw->con_debug_enter)
3510                 ret = vc->vc_sw->con_debug_enter(vc);
3511 #ifdef CONFIG_KGDB_KDB
3512         /* Set the initial LINES variable if it is not already set */
3513         if (vc->vc_rows < 999) {
3514                 int linecount;
3515                 char lns[4];
3516                 const char *setargs[3] = {
3517                         "set",
3518                         "LINES",
3519                         lns,
3520                 };
3521                 if (kdbgetintenv(setargs[0], &linecount)) {
3522                         snprintf(lns, 4, "%i", vc->vc_rows);
3523                         kdb_set(2, setargs);
3524                 }
3525         }
3526         if (vc->vc_cols < 999) {
3527                 int colcount;
3528                 char cols[4];
3529                 const char *setargs[3] = {
3530                         "set",
3531                         "COLUMNS",
3532                         cols,
3533                 };
3534                 if (kdbgetintenv(setargs[0], &colcount)) {
3535                         snprintf(cols, 4, "%i", vc->vc_cols);
3536                         kdb_set(2, setargs);
3537                 }
3538         }
3539 #endif /* CONFIG_KGDB_KDB */
3540         return ret;
3541 }
3542 EXPORT_SYMBOL_GPL(con_debug_enter);
3543
3544 /**
3545  * con_debug_leave - restore console state
3546  * @sw: console driver
3547  *
3548  * Restore the console state to what it was before the kernel debugger
3549  * was invoked.
3550  *
3551  * RETURNS:
3552  * Zero on success, nonzero if a failure occurred when trying to restore
3553  * the console.
3554  */
3555 int con_debug_leave(void)
3556 {
3557         struct vc_data *vc;
3558         int ret = 0;
3559
3560         fg_console = saved_fg_console;
3561         last_console = saved_last_console;
3562         want_console = saved_want_console;
3563         console_blanked = saved_console_blanked;
3564         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3565
3566         vc = vc_cons[fg_console].d;
3567         if (vc->vc_sw->con_debug_leave)
3568                 ret = vc->vc_sw->con_debug_leave(vc);
3569         return ret;
3570 }
3571 EXPORT_SYMBOL_GPL(con_debug_leave);
3572
3573 static int do_register_con_driver(const struct consw *csw, int first, int last)
3574 {
3575         struct module *owner = csw->owner;
3576         struct con_driver *con_driver;
3577         const char *desc;
3578         int i, retval;
3579
3580         WARN_CONSOLE_UNLOCKED();
3581
3582         if (!try_module_get(owner))
3583                 return -ENODEV;
3584
3585         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3586                 con_driver = &registered_con_driver[i];
3587
3588                 /* already registered */
3589                 if (con_driver->con == csw) {
3590                         retval = -EBUSY;
3591                         goto err;
3592                 }
3593         }
3594
3595         desc = csw->con_startup();
3596         if (!desc) {
3597                 retval = -ENODEV;
3598                 goto err;
3599         }
3600
3601         retval = -EINVAL;
3602
3603         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3604                 con_driver = &registered_con_driver[i];
3605
3606                 if (con_driver->con == NULL &&
3607                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3608                         con_driver->con = csw;
3609                         con_driver->desc = desc;
3610                         con_driver->node = i;
3611                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3612                                            CON_DRIVER_FLAG_INIT;
3613                         con_driver->first = first;
3614                         con_driver->last = last;
3615                         retval = 0;
3616                         break;
3617                 }
3618         }
3619
3620         if (retval)
3621                 goto err;
3622
3623         con_driver->dev =
3624                 device_create_with_groups(vtconsole_class, NULL,
3625                                           MKDEV(0, con_driver->node),
3626                                           con_driver, con_dev_groups,
3627                                           "vtcon%i", con_driver->node);
3628         if (IS_ERR(con_driver->dev)) {
3629                 printk(KERN_WARNING "Unable to create device for %s; "
3630                        "errno = %ld\n", con_driver->desc,
3631                        PTR_ERR(con_driver->dev));
3632                 con_driver->dev = NULL;
3633         } else {
3634                 vtconsole_init_device(con_driver);
3635         }
3636
3637 err:
3638         module_put(owner);
3639         return retval;
3640 }
3641
3642
3643 /**
3644  * do_unregister_con_driver - unregister console driver from console layer
3645  * @csw: console driver
3646  *
3647  * DESCRIPTION: All drivers that registers to the console layer must
3648  * call this function upon exit, or if the console driver is in a state
3649  * where it won't be able to handle console services, such as the
3650  * framebuffer console without loaded framebuffer drivers.
3651  *
3652  * The driver must unbind first prior to unregistration.
3653  */
3654 int do_unregister_con_driver(const struct consw *csw)
3655 {
3656         int i;
3657
3658         /* cannot unregister a bound driver */
3659         if (con_is_bound(csw))
3660                 return -EBUSY;
3661
3662         if (csw == conswitchp)
3663                 return -EINVAL;
3664
3665         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3666                 struct con_driver *con_driver = &registered_con_driver[i];
3667
3668                 if (con_driver->con == csw) {
3669                         /*
3670                          * Defer the removal of the sysfs entries since that
3671                          * will acquire the kernfs s_active lock and we can't
3672                          * acquire this lock while holding the console lock:
3673                          * the unbind sysfs entry imposes already the opposite
3674                          * order. Reset con already here to prevent any later
3675                          * lookup to succeed and mark this slot as zombie, so
3676                          * it won't get reused until we complete the removal
3677                          * in the deferred work.
3678                          */
3679                         con_driver->con = NULL;
3680                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3681                         schedule_work(&con_driver_unregister_work);
3682
3683                         return 0;
3684                 }
3685         }
3686
3687         return -ENODEV;
3688 }
3689 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3690
3691 static void con_driver_unregister_callback(struct work_struct *ignored)
3692 {
3693         int i;
3694
3695         console_lock();
3696
3697         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3698                 struct con_driver *con_driver = &registered_con_driver[i];
3699
3700                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3701                         continue;
3702
3703                 console_unlock();
3704
3705                 vtconsole_deinit_device(con_driver);
3706                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3707
3708                 console_lock();
3709
3710                 if (WARN_ON_ONCE(con_driver->con))
3711                         con_driver->con = NULL;
3712                 con_driver->desc = NULL;
3713                 con_driver->dev = NULL;
3714                 con_driver->node = 0;
3715                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3716                 con_driver->flag = 0;
3717                 con_driver->first = 0;
3718                 con_driver->last = 0;
3719         }
3720
3721         console_unlock();
3722 }
3723
3724 /*
3725  *      If we support more console drivers, this function is used
3726  *      when a driver wants to take over some existing consoles
3727  *      and become default driver for newly opened ones.
3728  *
3729  *      do_take_over_console is basically a register followed by unbind
3730  */
3731 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3732 {
3733         int err;
3734
3735         err = do_register_con_driver(csw, first, last);
3736         /*
3737          * If we get an busy error we still want to bind the console driver
3738          * and return success, as we may have unbound the console driver
3739          * but not unregistered it.
3740          */
3741         if (err == -EBUSY)
3742                 err = 0;
3743         if (!err)
3744                 do_bind_con_driver(csw, first, last, deflt);
3745
3746         return err;
3747 }
3748 EXPORT_SYMBOL_GPL(do_take_over_console);
3749
3750
3751 /*
3752  * give_up_console is a wrapper to unregister_con_driver. It will only
3753  * work if driver is fully unbound.
3754  */
3755 void give_up_console(const struct consw *csw)
3756 {
3757         console_lock();
3758         do_unregister_con_driver(csw);
3759         console_unlock();
3760 }
3761
3762 static int __init vtconsole_class_init(void)
3763 {
3764         int i;
3765
3766         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3767         if (IS_ERR(vtconsole_class)) {
3768                 printk(KERN_WARNING "Unable to create vt console class; "
3769                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3770                 vtconsole_class = NULL;
3771         }
3772
3773         /* Add system drivers to sysfs */
3774         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3775                 struct con_driver *con = &registered_con_driver[i];
3776
3777                 if (con->con && !con->dev) {
3778                         con->dev =
3779                                 device_create_with_groups(vtconsole_class, NULL,
3780                                                           MKDEV(0, con->node),
3781                                                           con, con_dev_groups,
3782                                                           "vtcon%i", con->node);
3783
3784                         if (IS_ERR(con->dev)) {
3785                                 printk(KERN_WARNING "Unable to create "
3786                                        "device for %s; errno = %ld\n",
3787                                        con->desc, PTR_ERR(con->dev));
3788                                 con->dev = NULL;
3789                         } else {
3790                                 vtconsole_init_device(con);
3791                         }
3792                 }
3793         }
3794
3795         return 0;
3796 }
3797 postcore_initcall(vtconsole_class_init);
3798
3799 #endif
3800
3801 /*
3802  *      Screen blanking
3803  */
3804
3805 static int set_vesa_blanking(char __user *p)
3806 {
3807         unsigned int mode;
3808
3809         if (get_user(mode, p + 1))
3810                 return -EFAULT;
3811
3812         vesa_blank_mode = (mode < 4) ? mode : 0;
3813         return 0;
3814 }
3815
3816 void do_blank_screen(int entering_gfx)
3817 {
3818         struct vc_data *vc = vc_cons[fg_console].d;
3819         int i;
3820
3821         WARN_CONSOLE_UNLOCKED();
3822
3823         if (console_blanked) {
3824                 if (blank_state == blank_vesa_wait) {
3825                         blank_state = blank_off;
3826                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3827                 }
3828                 return;
3829         }
3830
3831         /* entering graphics mode? */
3832         if (entering_gfx) {
3833                 hide_cursor(vc);
3834                 save_screen(vc);
3835                 vc->vc_sw->con_blank(vc, -1, 1);
3836                 console_blanked = fg_console + 1;
3837                 blank_state = blank_off;
3838                 set_origin(vc);
3839                 return;
3840         }
3841
3842         if (blank_state != blank_normal_wait)
3843                 return;
3844         blank_state = blank_off;
3845
3846         /* don't blank graphics */
3847         if (vc->vc_mode != KD_TEXT) {
3848                 console_blanked = fg_console + 1;
3849                 return;
3850         }
3851
3852         hide_cursor(vc);
3853         del_timer_sync(&console_timer);
3854         blank_timer_expired = 0;
3855
3856         save_screen(vc);
3857         /* In case we need to reset origin, blanking hook returns 1 */
3858         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3859         console_blanked = fg_console + 1;
3860         if (i)
3861                 set_origin(vc);
3862
3863         if (console_blank_hook && console_blank_hook(1))
3864                 return;
3865
3866         if (vesa_off_interval && vesa_blank_mode) {
3867                 blank_state = blank_vesa_wait;
3868                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3869         }
3870         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3871 }
3872 EXPORT_SYMBOL(do_blank_screen);
3873
3874 /*
3875  * Called by timer as well as from vt_console_driver
3876  */
3877 void do_unblank_screen(int leaving_gfx)
3878 {
3879         struct vc_data *vc;
3880
3881         /* This should now always be called from a "sane" (read: can schedule)
3882          * context for the sake of the low level drivers, except in the special
3883          * case of oops_in_progress
3884          */
3885         if (!oops_in_progress)
3886                 might_sleep();
3887
3888         WARN_CONSOLE_UNLOCKED();
3889
3890         ignore_poke = 0;
3891         if (!console_blanked)
3892                 return;
3893         if (!vc_cons_allocated(fg_console)) {
3894                 /* impossible */
3895                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3896                         fg_console + 1);
3897                 return;
3898         }
3899         vc = vc_cons[fg_console].d;
3900         /* Try to unblank in oops case too */
3901         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3902                 return; /* but leave console_blanked != 0 */
3903
3904         if (blankinterval) {
3905                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3906                 blank_state = blank_normal_wait;
3907         }
3908
3909         console_blanked = 0;
3910         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3911                 /* Low-level driver cannot restore -> do it ourselves */
3912                 update_screen(vc);
3913         if (console_blank_hook)
3914                 console_blank_hook(0);
3915         set_palette(vc);
3916         set_cursor(vc);
3917         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3918 }
3919 EXPORT_SYMBOL(do_unblank_screen);
3920
3921 /*
3922  * This is called by the outside world to cause a forced unblank, mostly for
3923  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3924  * call it with 1 as an argument and so force a mode restore... that may kill
3925  * X or at least garbage the screen but would also make the Oops visible...
3926  */
3927 void unblank_screen(void)
3928 {
3929         do_unblank_screen(0);
3930 }
3931
3932 /*
3933  * We defer the timer blanking to work queue so it can take the console mutex
3934  * (console operations can still happen at irq time, but only from printk which
3935  * has the console mutex. Not perfect yet, but better than no locking
3936  */
3937 static void blank_screen_t(unsigned long dummy)
3938 {
3939         if (unlikely(!keventd_up())) {
3940                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3941                 return;
3942         }
3943         blank_timer_expired = 1;
3944         schedule_work(&console_work);
3945 }
3946
3947 void poke_blanked_console(void)
3948 {
3949         WARN_CONSOLE_UNLOCKED();
3950
3951         /* Add this so we quickly catch whoever might call us in a non
3952          * safe context. Nowadays, unblank_screen() isn't to be called in
3953          * atomic contexts and is allowed to schedule (with the special case
3954          * of oops_in_progress, but that isn't of any concern for this
3955          * function. --BenH.
3956          */
3957         might_sleep();
3958
3959         /* This isn't perfectly race free, but a race here would be mostly harmless,
3960          * at worse, we'll do a spurrious blank and it's unlikely
3961          */
3962         del_timer(&console_timer);
3963         blank_timer_expired = 0;
3964
3965         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3966                 return;
3967         if (console_blanked)
3968                 unblank_screen();
3969         else if (blankinterval) {
3970                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3971                 blank_state = blank_normal_wait;
3972         }
3973 }
3974
3975 /*
3976  *      Palettes
3977  */
3978
3979 static void set_palette(struct vc_data *vc)
3980 {
3981         WARN_CONSOLE_UNLOCKED();
3982
3983         if (vc->vc_mode != KD_GRAPHICS)
3984                 vc->vc_sw->con_set_palette(vc, color_table);
3985 }
3986
3987 /*
3988  * Load palette into the DAC registers. arg points to a colour
3989  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3990  */
3991
3992 int con_set_cmap(unsigned char __user *arg)
3993 {
3994         int i, j, k;
3995         unsigned char colormap[3*16];
3996
3997         if (copy_from_user(colormap, arg, sizeof(colormap)))
3998                 return -EFAULT;
3999
4000         console_lock();
4001         for (i = k = 0; i < 16; i++) {
4002                 default_red[i] = colormap[k++];
4003                 default_grn[i] = colormap[k++];
4004                 default_blu[i] = colormap[k++];
4005         }
4006         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4007                 if (!vc_cons_allocated(i))
4008                         continue;
4009                 for (j = k = 0; j < 16; j++) {
4010                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4011                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4012                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4013                 }
4014                 set_palette(vc_cons[i].d);
4015         }
4016         console_unlock();
4017
4018         return 0;
4019 }
4020
4021 int con_get_cmap(unsigned char __user *arg)
4022 {
4023         int i, k;
4024         unsigned char colormap[3*16];
4025
4026         console_lock();
4027         for (i = k = 0; i < 16; i++) {
4028                 colormap[k++] = default_red[i];
4029                 colormap[k++] = default_grn[i];
4030                 colormap[k++] = default_blu[i];
4031         }
4032         console_unlock();
4033
4034         if (copy_to_user(arg, colormap, sizeof(colormap)))
4035                 return -EFAULT;
4036
4037         return 0;
4038 }
4039
4040 void reset_palette(struct vc_data *vc)
4041 {
4042         int j, k;
4043         for (j=k=0; j<16; j++) {
4044                 vc->vc_palette[k++] = default_red[j];
4045                 vc->vc_palette[k++] = default_grn[j];
4046                 vc->vc_palette[k++] = default_blu[j];
4047         }
4048         set_palette(vc);
4049 }
4050
4051 /*
4052  *  Font switching
4053  *
4054  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4055  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4056  *  depending on width) reserved for each character which is kinda wasty, but
4057  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4058  *  is up to the actual low-level console-driver convert data into its favorite
4059  *  format (maybe we should add a `fontoffset' field to the `display'
4060  *  structure so we won't have to convert the fontdata all the time.
4061  *  /Jes
4062  */
4063
4064 #define max_font_size 65536
4065
4066 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4067 {
4068         struct console_font font;
4069         int rc = -EINVAL;
4070         int c;
4071
4072         if (op->data) {
4073                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4074                 if (!font.data)
4075                         return -ENOMEM;
4076         } else
4077                 font.data = NULL;
4078
4079         console_lock();
4080         if (vc->vc_mode != KD_TEXT)
4081                 rc = -EINVAL;
4082         else if (vc->vc_sw->con_font_get)
4083                 rc = vc->vc_sw->con_font_get(vc, &font);
4084         else
4085                 rc = -ENOSYS;
4086         console_unlock();
4087
4088         if (rc)
4089                 goto out;
4090
4091         c = (font.width+7)/8 * 32 * font.charcount;
4092
4093         if (op->data && font.charcount > op->charcount)
4094                 rc = -ENOSPC;
4095         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4096                 if (font.width > op->width || font.height > op->height)
4097                         rc = -ENOSPC;
4098         } else {
4099                 if (font.width != 8)
4100                         rc = -EIO;
4101                 else if ((op->height && font.height > op->height) ||
4102                          font.height > 32)
4103                         rc = -ENOSPC;
4104         }
4105         if (rc)
4106                 goto out;
4107
4108         op->height = font.height;
4109         op->width = font.width;
4110         op->charcount = font.charcount;
4111
4112         if (op->data && copy_to_user(op->data, font.data, c))
4113                 rc = -EFAULT;
4114
4115 out:
4116         kfree(font.data);
4117         return rc;
4118 }
4119
4120 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4121 {
4122         struct console_font font;
4123         int rc = -EINVAL;
4124         int size;
4125
4126         if (vc->vc_mode != KD_TEXT)
4127                 return -EINVAL;
4128         if (!op->data)
4129                 return -EINVAL;
4130         if (op->charcount > 512)
4131                 return -EINVAL;
4132         if (!op->height) {              /* Need to guess font height [compat] */
4133                 int h, i;
4134                 u8 __user *charmap = op->data;
4135                 u8 tmp;
4136
4137                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4138                    so that we can get rid of this soon */
4139                 if (!(op->flags & KD_FONT_FLAG_OLD))
4140                         return -EINVAL;
4141                 for (h = 32; h > 0; h--)
4142                         for (i = 0; i < op->charcount; i++) {
4143                                 if (get_user(tmp, &charmap[32*i+h-1]))
4144                                         return -EFAULT;
4145                                 if (tmp)
4146                                         goto nonzero;
4147                         }
4148                 return -EINVAL;
4149         nonzero:
4150                 op->height = h;
4151         }
4152         if (op->width <= 0 || op->width > 32 || op->height > 32)
4153                 return -EINVAL;
4154         size = (op->width+7)/8 * 32 * op->charcount;
4155         if (size > max_font_size)
4156                 return -ENOSPC;
4157         font.charcount = op->charcount;
4158         font.height = op->height;
4159         font.width = op->width;
4160         font.data = memdup_user(op->data, size);
4161         if (IS_ERR(font.data))
4162                 return PTR_ERR(font.data);
4163         console_lock();
4164         if (vc->vc_mode != KD_TEXT)
4165                 rc = -EINVAL;
4166         else if (vc->vc_sw->con_font_set)
4167                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4168         else
4169                 rc = -ENOSYS;
4170         console_unlock();
4171         kfree(font.data);
4172         return rc;
4173 }
4174
4175 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4176 {
4177         struct console_font font = {.width = op->width, .height = op->height};
4178         char name[MAX_FONT_NAME];
4179         char *s = name;
4180         int rc;
4181
4182
4183         if (!op->data)
4184                 s = NULL;
4185         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4186                 return -EFAULT;
4187         else
4188                 name[MAX_FONT_NAME - 1] = 0;
4189
4190         console_lock();
4191         if (vc->vc_mode != KD_TEXT) {
4192                 console_unlock();
4193                 return -EINVAL;
4194         }
4195         if (vc->vc_sw->con_font_default)
4196                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4197         else
4198                 rc = -ENOSYS;
4199         console_unlock();
4200         if (!rc) {
4201                 op->width = font.width;
4202                 op->height = font.height;
4203         }
4204         return rc;
4205 }
4206
4207 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4208 {
4209         int con = op->height;
4210         int rc;
4211
4212
4213         console_lock();
4214         if (vc->vc_mode != KD_TEXT)
4215                 rc = -EINVAL;
4216         else if (!vc->vc_sw->con_font_copy)
4217                 rc = -ENOSYS;
4218         else if (con < 0 || !vc_cons_allocated(con))
4219                 rc = -ENOTTY;
4220         else if (con == vc->vc_num)     /* nothing to do */
4221                 rc = 0;
4222         else
4223                 rc = vc->vc_sw->con_font_copy(vc, con);
4224         console_unlock();
4225         return rc;
4226 }
4227
4228 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4229 {
4230         switch (op->op) {
4231         case KD_FONT_OP_SET:
4232                 return con_font_set(vc, op);
4233         case KD_FONT_OP_GET:
4234                 return con_font_get(vc, op);
4235         case KD_FONT_OP_SET_DEFAULT:
4236                 return con_font_default(vc, op);
4237         case KD_FONT_OP_COPY:
4238                 return con_font_copy(vc, op);
4239         }
4240         return -ENOSYS;
4241 }
4242
4243 /*
4244  *      Interface exported to selection and vcs.
4245  */
4246
4247 /* used by selection */
4248 u16 screen_glyph(struct vc_data *vc, int offset)
4249 {
4250         u16 w = scr_readw(screenpos(vc, offset, 1));
4251         u16 c = w & 0xff;
4252
4253         if (w & vc->vc_hi_font_mask)
4254                 c |= 0x100;
4255         return c;
4256 }
4257 EXPORT_SYMBOL_GPL(screen_glyph);
4258
4259 /* used by vcs - note the word offset */
4260 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4261 {
4262         return screenpos(vc, 2 * w_offset, viewed);
4263 }
4264 EXPORT_SYMBOL_GPL(screen_pos);
4265
4266 void getconsxy(struct vc_data *vc, unsigned char *p)
4267 {
4268         p[0] = vc->vc_x;
4269         p[1] = vc->vc_y;
4270 }
4271
4272 void putconsxy(struct vc_data *vc, unsigned char *p)
4273 {
4274         hide_cursor(vc);
4275         gotoxy(vc, p[0], p[1]);
4276         set_cursor(vc);
4277 }
4278
4279 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4280 {
4281         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4282                 return softcursor_original;
4283         return scr_readw(org);
4284 }
4285
4286 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4287 {
4288         scr_writew(val, org);
4289         if ((unsigned long)org == vc->vc_pos) {
4290                 softcursor_original = -1;
4291                 add_softcursor(vc);
4292         }
4293 }
4294
4295 void vcs_scr_updated(struct vc_data *vc)
4296 {
4297         notify_update(vc);
4298 }
4299
4300 /*
4301  *      Visible symbols for modules
4302  */
4303
4304 EXPORT_SYMBOL(color_table);
4305 EXPORT_SYMBOL(default_red);
4306 EXPORT_SYMBOL(default_grn);
4307 EXPORT_SYMBOL(default_blu);
4308 EXPORT_SYMBOL(update_region);
4309 EXPORT_SYMBOL(redraw_screen);
4310 EXPORT_SYMBOL(vc_resize);
4311 EXPORT_SYMBOL(fg_console);
4312 EXPORT_SYMBOL(console_blank_hook);
4313 EXPORT_SYMBOL(console_blanked);
4314 EXPORT_SYMBOL(vc_cons);
4315 EXPORT_SYMBOL(global_cursor_default);
4316 #ifndef VT_SINGLE_DRIVER
4317 EXPORT_SYMBOL(give_up_console);
4318 #endif