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;
 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_is_sel(vc))
 604                 clear_selection();
 605
 606         vc->vc_sw->con_cursor(vc, CM_ERASE);
 607         hide_softcursor(vc);
 608 }
 609
 610 static void set_cursor(struct vc_data *vc)
 611 {
 612         if (!IS_FG(vc) || console_blanked ||
 613             vc->vc_mode == KD_GRAPHICS)
 614                 return;
 615         if (vc->vc_deccm) {
 616                 if (vc_is_sel(vc))
 617                         clear_selection();
 618                 add_softcursor(vc);
 619                 if ((vc->vc_cursor_type & 0x0f) != 1)
 620                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 621         } else
 622                 hide_cursor(vc);
 623 }
 624
 625 static void set_origin(struct vc_data *vc)
 626 {
 627         WARN_CONSOLE_UNLOCKED();
 628
 629         if (!CON_IS_VISIBLE(vc) ||
 630             !vc->vc_sw->con_set_origin ||
 631             !vc->vc_sw->con_set_origin(vc))
 632                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 633         vc->vc_visible_origin = vc->vc_origin;
 634         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 635         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 636 }
 637
 638 static inline void save_screen(struct vc_data *vc)
 639 {
 640         WARN_CONSOLE_UNLOCKED();
 641
 642         if (vc->vc_sw->con_save_screen)
 643                 vc->vc_sw->con_save_screen(vc);
 644 }
 645
 646 /*
 647  *      Redrawing of screen
 648  */
 649
 650 void clear_buffer_attributes(struct vc_data *vc)
 651 {
 652         unsigned short *p = (unsigned short *)vc->vc_origin;
 653         int count = vc->vc_screenbuf_size / 2;
 654         int mask = vc->vc_hi_font_mask | 0xff;
 655
 656         for (; count > 0; count--, p++) {
 657                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 658         }
 659 }
 660
 661 void redraw_screen(struct vc_data *vc, int is_switch)
 662 {
 663         int redraw = 0;
 664
 665         WARN_CONSOLE_UNLOCKED();
 666
 667         if (!vc) {
 668                 /* strange ... */
 669                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 670                 return;
 671         }
 672
 673         if (is_switch) {
 674                 struct vc_data *old_vc = vc_cons[fg_console].d;
 675                 if (old_vc == vc)
 676                         return;
 677                 if (!CON_IS_VISIBLE(vc))
 678                         redraw = 1;
 679                 *vc->vc_display_fg = vc;
 680                 fg_console = vc->vc_num;
 681                 hide_cursor(old_vc);
 682                 if (!CON_IS_VISIBLE(old_vc)) {
 683                         save_screen(old_vc);
 684                         set_origin(old_vc);
 685                 }
 686                 if (tty0dev)
 687                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 688         } else {
 689                 hide_cursor(vc);
 690                 redraw = 1;
 691         }
 692
 693         if (redraw) {
 694                 int update;
 695                 int old_was_color = vc->vc_can_do_color;
 696
 697                 set_origin(vc);
 698                 update = vc->vc_sw->con_switch(vc);
 699                 set_palette(vc);
 700                 /*
 701                  * If console changed from mono<->color, the best we can do
 702                  * is to clear the buffer attributes. As it currently stands,
 703                  * rebuilding new attributes from the old buffer is not doable
 704                  * without overly complex code.
 705                  */
 706                 if (old_was_color != vc->vc_can_do_color) {
 707                         update_attr(vc);
 708                         clear_buffer_attributes(vc);
 709                 }
 710
 711                 /* Forcibly update if we're panicing */
 712                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 713                     vt_force_oops_output(vc))
 714                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 715         }
 716         set_cursor(vc);
 717         if (is_switch) {
 718                 set_leds();
 719                 compute_shiftstate();
 720                 notify_update(vc);
 721         }
 722 }
 723
 724 /*
 725  *      Allocation, freeing and resizing of VTs.
 726  */
 727
 728 int vc_cons_allocated(unsigned int i)
 729 {
 730         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 731 }
 732
 733 static void visual_init(struct vc_data *vc, int num, int init)
 734 {
 735         /* ++Geert: vc->vc_sw->con_init determines console size */
 736         if (vc->vc_sw)
 737                 module_put(vc->vc_sw->owner);
 738         vc->vc_sw = conswitchp;
 739 #ifndef VT_SINGLE_DRIVER
 740         if (con_driver_map[num])
 741                 vc->vc_sw = con_driver_map[num];
 742 #endif
 743         __module_get(vc->vc_sw->owner);
 744         vc->vc_num = num;
 745         vc->vc_display_fg = &master_display_fg;
 746         if (vc->vc_uni_pagedir_loc)
 747                 con_free_unimap(vc);
 748         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 749         vc->vc_uni_pagedir = NULL;
 750         vc->vc_hi_font_mask = 0;
 751         vc->vc_complement_mask = 0;
 752         vc->vc_can_do_color = 0;
 753         vc->vc_panic_force_write = false;
 754         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
 755         vc->vc_sw->con_init(vc, init);
 756         if (!vc->vc_complement_mask)
 757                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 758         vc->vc_s_complement_mask = vc->vc_complement_mask;
 759         vc->vc_size_row = vc->vc_cols << 1;
 760         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 761 }
 762
 763 static void vc_port_destruct(struct tty_port *port)
 764 {
 765         struct vc_data *vc = container_of(port, struct vc_data, port);
 766
 767         kfree(vc);
 768 }
 769
 770 static const struct tty_port_operations vc_port_ops = {
 771         .destruct = vc_port_destruct,
 772 };
 773
 774 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 775 {
 776         WARN_CONSOLE_UNLOCKED();
 777
 778         if (currcons >= MAX_NR_CONSOLES)
 779                 return -ENXIO;
 780         if (!vc_cons[currcons].d) {
 781             struct vc_data *vc;
 782             struct vt_notifier_param param;
 783
 784             /* prevent users from taking too much memory */
 785             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 786               return -EPERM;
 787
 788             /* due to the granularity of kmalloc, we waste some memory here */
 789             /* the alloc is done in two steps, to optimize the common situation
 790                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 791             /* although the numbers above are not valid since long ago, the
 792                point is still up-to-date and the comment still has its value
 793                even if only as a historical artifact.  --mj, July 1998 */
 794             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 795             if (!vc)
 796                 return -ENOMEM;
 797             vc_cons[currcons].d = vc;
 798             tty_port_init(&vc->port);
 799             vc->port.ops = &vc_port_ops;
 800             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 801             visual_init(vc, currcons, 1);
 802             if (!*vc->vc_uni_pagedir_loc)
 803                 con_set_default_unimap(vc);
 804             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 805             if (!vc->vc_screenbuf) {
 806                 kfree(vc);
 807                 vc_cons[currcons].d = NULL;
 808                 return -ENOMEM;
 809             }
 810
 811             /* If no drivers have overridden us and the user didn't pass a
 812                boot option, default to displaying the cursor */
 813             if (global_cursor_default == -1)
 814                     global_cursor_default = 1;
 815
 816             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 817             vcs_make_sysfs(currcons);
 818             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 819         }
 820         return 0;
 821 }
 822
 823 static inline int resize_screen(struct vc_data *vc, int width, int height,
 824                                 int user)
 825 {
 826         /* Resizes the resolution of the display adapater */
 827         int err = 0;
 828
 829         if (vc->vc_sw->con_resize)
 830                 err = vc->vc_sw->con_resize(vc, width, height, user);
 831
 832         return err;
 833 }
 834
 835 /*
 836  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 837  * [this is to be used together with some user program
 838  * like resize that changes the hardware videomode]
 839  */
 840 #define VC_RESIZE_MAXCOL (32767)
 841 #define VC_RESIZE_MAXROW (32767)
 842
 843 /**
 844  *      vc_do_resize    -       resizing method for the tty
 845  *      @tty: tty being resized
 846  *      @real_tty: real tty (different to tty if a pty/tty pair)
 847  *      @vc: virtual console private data
 848  *      @cols: columns
 849  *      @lines: lines
 850  *
 851  *      Resize a virtual console, clipping according to the actual constraints.
 852  *      If the caller passes a tty structure then update the termios winsize
 853  *      information and perform any necessary signal handling.
 854  *
 855  *      Caller must hold the console semaphore. Takes the termios rwsem and
 856  *      ctrl_lock of the tty IFF a tty is passed.
 857  */
 858
 859 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 860                                 unsigned int cols, unsigned int lines)
 861 {
 862         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 863         unsigned long end;
 864         unsigned int old_rows, old_row_size;
 865         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 866         unsigned int user;
 867         unsigned short *oldscreen, *newscreen;
 868
 869         WARN_CONSOLE_UNLOCKED();
 870
 871         if (!vc)
 872                 return -ENXIO;
 873
 874         user = vc->vc_resize_user;
 875         vc->vc_resize_user = 0;
 876
 877         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 878                 return -EINVAL;
 879
 880         new_cols = (cols ? cols : vc->vc_cols);
 881         new_rows = (lines ? lines : vc->vc_rows);
 882         new_row_size = new_cols << 1;
 883         new_screen_size = new_row_size * new_rows;
 884
 885         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
 886                 /*
 887                  * This function is being called here to cover the case
 888                  * where the userspace calls the FBIOPUT_VSCREENINFO twice,
 889                  * passing the same fb_var_screeninfo containing the fields
 890                  * yres/xres equal to a number non-multiple of vc_font.height
 891                  * and yres_virtual/xres_virtual equal to number lesser than the
 892                  * vc_font.height and yres/xres.
 893                  * In the second call, the struct fb_var_screeninfo isn't
 894                  * being modified by the underlying driver because of the
 895                  * if above, and this causes the fbcon_display->vrows to become
 896                  * negative and it eventually leads to out-of-bound
 897                  * access by the imageblit function.
 898                  * To give the correct values to the struct and to not have
 899                  * to deal with possible errors from the code below, we call
 900                  * the resize_screen here as well.
 901                  */
 902                 return resize_screen(vc, new_cols, new_rows, user);
 903         }
 904
 905         if (new_screen_size > (4 << 20))
 906                 return -EINVAL;
 907         newscreen = kmalloc(new_screen_size, GFP_USER);
 908         if (!newscreen)
 909                 return -ENOMEM;
 910
 911         if (vc_is_sel(vc))
 912                 clear_selection();
 913
 914         old_rows = vc->vc_rows;
 915         old_row_size = vc->vc_size_row;
 916
 917         err = resize_screen(vc, new_cols, new_rows, user);
 918         if (err) {
 919                 kfree(newscreen);
 920                 return err;
 921         }
 922
 923         vc->vc_rows = new_rows;
 924         vc->vc_cols = new_cols;
 925         vc->vc_size_row = new_row_size;
 926         vc->vc_screenbuf_size = new_screen_size;
 927
 928         rlth = min(old_row_size, new_row_size);
 929         rrem = new_row_size - rlth;
 930         old_origin = vc->vc_origin;
 931         new_origin = (long) newscreen;
 932         new_scr_end = new_origin + new_screen_size;
 933
 934         if (vc->vc_y > new_rows) {
 935                 if (old_rows - vc->vc_y < new_rows) {
 936                         /*
 937                          * Cursor near the bottom, copy contents from the
 938                          * bottom of buffer
 939                          */
 940                         old_origin += (old_rows - new_rows) * old_row_size;
 941                 } else {
 942                         /*
 943                          * Cursor is in no man's land, copy 1/2 screenful
 944                          * from the top and bottom of cursor position
 945                          */
 946                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 947                 }
 948         }
 949
 950         end = old_origin + old_row_size * min(old_rows, new_rows);
 951
 952         update_attr(vc);
 953
 954         while (old_origin < end) {
 955                 scr_memcpyw((unsigned short *) new_origin,
 956                             (unsigned short *) old_origin, rlth);
 957                 if (rrem)
 958                         scr_memsetw((void *)(new_origin + rlth),
 959                                     vc->vc_video_erase_char, rrem);
 960                 old_origin += old_row_size;
 961                 new_origin += new_row_size;
 962         }
 963         if (new_scr_end > new_origin)
 964                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 965                             new_scr_end - new_origin);
 966         oldscreen = vc->vc_screenbuf;
 967         vc->vc_screenbuf = newscreen;
 968         vc->vc_screenbuf_size = new_screen_size;
 969         set_origin(vc);
 970         kfree(oldscreen);
 971
 972         /* do part of a reset_terminal() */
 973         vc->vc_top = 0;
 974         vc->vc_bottom = vc->vc_rows;
 975         gotoxy(vc, vc->vc_x, vc->vc_y);
 976         save_cur(vc);
 977
 978         if (tty) {
 979                 /* Rewrite the requested winsize data with the actual
 980                    resulting sizes */
 981                 struct winsize ws;
 982                 memset(&ws, 0, sizeof(ws));
 983                 ws.ws_row = vc->vc_rows;
 984                 ws.ws_col = vc->vc_cols;
 985                 ws.ws_ypixel = vc->vc_scan_lines;
 986                 tty_do_resize(tty, &ws);
 987         }
 988
 989         if (CON_IS_VISIBLE(vc))
 990                 update_screen(vc);
 991         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 992         notify_update(vc);
 993         return err;
 994 }
 995
 996 /**
 997  *      vc_resize               -       resize a VT
 998  *      @vc: virtual console
 999  *      @cols: columns
1000  *      @rows: rows
1001  *
1002  *      Resize a virtual console as seen from the console end of things. We
1003  *      use the common vc_do_resize methods to update the structures. The
1004  *      caller must hold the console sem to protect console internals and
1005  *      vc->port.tty
1006  */
1007
1008 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1009 {
1010         return vc_do_resize(vc->port.tty, vc, cols, rows);
1011 }
1012
1013 /**
1014  *      vt_resize               -       resize a VT
1015  *      @tty: tty to resize
1016  *      @ws: winsize attributes
1017  *
1018  *      Resize a virtual terminal. This is called by the tty layer as we
1019  *      register our own handler for resizing. The mutual helper does all
1020  *      the actual work.
1021  *
1022  *      Takes the console sem and the called methods then take the tty
1023  *      termios_rwsem and the tty ctrl_lock in that order.
1024  */
1025 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1026 {
1027         struct vc_data *vc = tty->driver_data;
1028         int ret;
1029
1030         console_lock();
1031         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1032         console_unlock();
1033         return ret;
1034 }
1035
1036 struct vc_data *vc_deallocate(unsigned int currcons)
1037 {
1038         struct vc_data *vc = NULL;
1039
1040         WARN_CONSOLE_UNLOCKED();
1041
1042         if (vc_cons_allocated(currcons)) {
1043                 struct vt_notifier_param param;
1044
1045                 param.vc = vc = vc_cons[currcons].d;
1046                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1047                 vcs_remove_sysfs(currcons);
1048                 vc->vc_sw->con_deinit(vc);
1049                 put_pid(vc->vt_pid);
1050                 module_put(vc->vc_sw->owner);
1051                 kfree(vc->vc_screenbuf);
1052                 vc_cons[currcons].d = NULL;
1053         }
1054         return vc;
1055 }
1056
1057 /*
1058  *      VT102 emulator
1059  */
1060
1061 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1062 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1063 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1064
1065 #define decarm          VC_REPEAT
1066 #define decckm          VC_CKMODE
1067 #define kbdapplic       VC_APPLIC
1068 #define lnm             VC_CRLF
1069
1070 /*
1071  * this is what the terminal answers to a ESC-Z or csi0c query.
1072  */
1073 #define VT100ID "\033[?1;2c"
1074 #define VT102ID "\033[?6c"
1075
1076 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1077                                        8,12,10,14, 9,13,11,15 };
1078
1079 /* the default colour table, for VGA+ colour systems */
1080 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1081     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1082 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1083     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1084 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1085     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1086
1087 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1088 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1089 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1090
1091 /*
1092  * gotoxy() must verify all boundaries, because the arguments
1093  * might also be negative. If the given position is out of
1094  * bounds, the cursor is placed at the nearest margin.
1095  */
1096 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1097 {
1098         int min_y, max_y;
1099
1100         if (new_x < 0)
1101                 vc->vc_x = 0;
1102         else {
1103                 if (new_x >= vc->vc_cols)
1104                         vc->vc_x = vc->vc_cols - 1;
1105                 else
1106                         vc->vc_x = new_x;
1107         }
1108
1109         if (vc->vc_decom) {
1110                 min_y = vc->vc_top;
1111                 max_y = vc->vc_bottom;
1112         } else {
1113                 min_y = 0;
1114                 max_y = vc->vc_rows;
1115         }
1116         if (new_y < min_y)
1117                 vc->vc_y = min_y;
1118         else if (new_y >= max_y)
1119                 vc->vc_y = max_y - 1;
1120         else
1121                 vc->vc_y = new_y;
1122         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1123         vc->vc_need_wrap = 0;
1124 }
1125
1126 /* for absolute user moves, when decom is set */
1127 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1128 {
1129         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1130 }
1131
1132 void scrollback(struct vc_data *vc, int lines)
1133 {
1134         if (!lines)
1135                 lines = vc->vc_rows / 2;
1136         scrolldelta(-lines);
1137 }
1138
1139 void scrollfront(struct vc_data *vc, int lines)
1140 {
1141         if (!lines)
1142                 lines = vc->vc_rows / 2;
1143         scrolldelta(lines);
1144 }
1145
1146 static void lf(struct vc_data *vc)
1147 {
1148         /* don't scroll if above bottom of scrolling region, or
1149          * if below scrolling region
1150          */
1151         if (vc->vc_y + 1 == vc->vc_bottom)
1152                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1153         else if (vc->vc_y < vc->vc_rows - 1) {
1154                 vc->vc_y++;
1155                 vc->vc_pos += vc->vc_size_row;
1156         }
1157         vc->vc_need_wrap = 0;
1158         notify_write(vc, '\n');
1159 }
1160
1161 static void ri(struct vc_data *vc)
1162 {
1163         /* don't scroll if below top of scrolling region, or
1164          * if above scrolling region
1165          */
1166         if (vc->vc_y == vc->vc_top)
1167                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1168         else if (vc->vc_y > 0) {
1169                 vc->vc_y--;
1170                 vc->vc_pos -= vc->vc_size_row;
1171         }
1172         vc->vc_need_wrap = 0;
1173 }
1174
1175 static inline void cr(struct vc_data *vc)
1176 {
1177         vc->vc_pos -= vc->vc_x << 1;
1178         vc->vc_need_wrap = vc->vc_x = 0;
1179         notify_write(vc, '\r');
1180 }
1181
1182 static inline void bs(struct vc_data *vc)
1183 {
1184         if (vc->vc_x) {
1185                 vc->vc_pos -= 2;
1186                 vc->vc_x--;
1187                 vc->vc_need_wrap = 0;
1188                 notify_write(vc, '\b');
1189         }
1190 }
1191
1192 static inline void del(struct vc_data *vc)
1193 {
1194         /* ignored */
1195 }
1196
1197 static void csi_J(struct vc_data *vc, int vpar)
1198 {
1199         unsigned int count;
1200         unsigned short * start;
1201
1202         switch (vpar) {
1203                 case 0: /* erase from cursor to end of display */
1204                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1205                         start = (unsigned short *)vc->vc_pos;
1206                         break;
1207                 case 1: /* erase from start to cursor */
1208                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1209                         start = (unsigned short *)vc->vc_origin;
1210                         break;
1211                 case 3: /* erase scroll-back buffer (and whole display) */
1212                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1213                                     vc->vc_screenbuf_size);
1214                         set_origin(vc);
1215                         if (CON_IS_VISIBLE(vc))
1216                                 update_screen(vc);
1217                         /* fall through */
1218                 case 2: /* erase whole display */
1219                         count = vc->vc_cols * vc->vc_rows;
1220                         start = (unsigned short *)vc->vc_origin;
1221                         break;
1222                 default:
1223                         return;
1224         }
1225         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1226         if (DO_UPDATE(vc))
1227                 do_update_region(vc, (unsigned long) start, count);
1228         vc->vc_need_wrap = 0;
1229 }
1230
1231 static void csi_K(struct vc_data *vc, int vpar)
1232 {
1233         unsigned int count;
1234         unsigned short * start;
1235
1236         switch (vpar) {
1237                 case 0: /* erase from cursor to end of line */
1238                         count = vc->vc_cols - vc->vc_x;
1239                         start = (unsigned short *)vc->vc_pos;
1240                         break;
1241                 case 1: /* erase from start of line to cursor */
1242                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1243                         count = vc->vc_x + 1;
1244                         break;
1245                 case 2: /* erase whole line */
1246                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1247                         count = vc->vc_cols;
1248                         break;
1249                 default:
1250                         return;
1251         }
1252         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1253         vc->vc_need_wrap = 0;
1254         if (DO_UPDATE(vc))
1255                 do_update_region(vc, (unsigned long) start, count);
1256 }
1257
1258 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1259 {                                         /* not vt100? */
1260         int count;
1261
1262         if (!vpar)
1263                 vpar++;
1264         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1265
1266         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1267         if (DO_UPDATE(vc))
1268                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1269         vc->vc_need_wrap = 0;
1270 }
1271
1272 static void default_attr(struct vc_data *vc)
1273 {
1274         vc->vc_intensity = 1;
1275         vc->vc_italic = 0;
1276         vc->vc_underline = 0;
1277         vc->vc_reverse = 0;
1278         vc->vc_blink = 0;
1279         vc->vc_color = vc->vc_def_color;
1280 }
1281
1282 struct rgb { u8 r; u8 g; u8 b; };
1283
1284 static struct rgb rgb_from_256(int i)
1285 {
1286         struct rgb c;
1287         if (i < 8) {            /* Standard colours. */
1288                 c.r = i&1 ? 0xaa : 0x00;
1289                 c.g = i&2 ? 0xaa : 0x00;
1290                 c.b = i&4 ? 0xaa : 0x00;
1291         } else if (i < 16) {
1292                 c.r = i&1 ? 0xff : 0x55;
1293                 c.g = i&2 ? 0xff : 0x55;
1294                 c.b = i&4 ? 0xff : 0x55;
1295         } else if (i < 232) {   /* 6x6x6 colour cube. */
1296                 c.r = (i - 16) / 36 * 85 / 2;
1297                 c.g = (i - 16) / 6 % 6 * 85 / 2;
1298                 c.b = (i - 16) % 6 * 85 / 2;
1299         } else                  /* Grayscale ramp. */
1300                 c.r = c.g = c.b = i * 10 - 2312;
1301         return c;
1302 }
1303
1304 static void rgb_foreground(struct vc_data *vc, struct rgb c)
1305 {
1306         u8 hue, max = c.r;
1307         if (c.g > max)
1308                 max = c.g;
1309         if (c.b > max)
1310                 max = c.b;
1311         hue = (c.r > max/2 ? 4 : 0)
1312             | (c.g > max/2 ? 2 : 0)
1313             | (c.b > max/2 ? 1 : 0);
1314         if (hue == 7 && max <= 0x55)
1315                 hue = 0, vc->vc_intensity = 2;
1316         else
1317                 vc->vc_intensity = (max > 0xaa) + 1;
1318         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1319 }
1320
1321 static void rgb_background(struct vc_data *vc, struct rgb c)
1322 {
1323         /* For backgrounds, err on the dark side. */
1324         vc->vc_color = (vc->vc_color & 0x0f)
1325                 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1326 }
1327
1328 /* console_lock is held */
1329 static void csi_m(struct vc_data *vc)
1330 {
1331         int i;
1332
1333         for (i = 0; i <= vc->vc_npar; i++)
1334                 switch (vc->vc_par[i]) {
1335                         case 0: /* all attributes off */
1336                                 default_attr(vc);
1337                                 break;
1338                         case 1:
1339                                 vc->vc_intensity = 2;
1340                                 break;
1341                         case 2:
1342                                 vc->vc_intensity = 0;
1343                                 break;
1344                         case 3:
1345                                 vc->vc_italic = 1;
1346                                 break;
1347                         case 21:
1348                                 /*
1349                                  * No console drivers support double underline, so
1350                                  * convert it to a single underline.
1351                                  */
1352                         case 4:
1353                                 vc->vc_underline = 1;
1354                                 break;
1355                         case 5:
1356                                 vc->vc_blink = 1;
1357                                 break;
1358                         case 7:
1359                                 vc->vc_reverse = 1;
1360                                 break;
1361                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1362                                   * Select primary font, don't display
1363                                   * control chars if defined, don't set
1364                                   * bit 8 on output.
1365                                   */
1366                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1367                                                 ? vc->vc_G0_charset
1368                                                 : vc->vc_G1_charset, vc);
1369                                 vc->vc_disp_ctrl = 0;
1370                                 vc->vc_toggle_meta = 0;
1371                                 break;
1372                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1373                                   * Select first alternate font, lets
1374                                   * chars < 32 be displayed as ROM chars.
1375                                   */
1376                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1377                                 vc->vc_disp_ctrl = 1;
1378                                 vc->vc_toggle_meta = 0;
1379                                 break;
1380                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1381                                   * Select second alternate font, toggle
1382                                   * high bit before displaying as ROM char.
1383                                   */
1384                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1385                                 vc->vc_disp_ctrl = 1;
1386                                 vc->vc_toggle_meta = 1;
1387                                 break;
1388                         case 22:
1389                                 vc->vc_intensity = 1;
1390                                 break;
1391                         case 23:
1392                                 vc->vc_italic = 0;
1393                                 break;
1394                         case 24:
1395                                 vc->vc_underline = 0;
1396                                 break;
1397                         case 25:
1398                                 vc->vc_blink = 0;
1399                                 break;
1400                         case 27:
1401                                 vc->vc_reverse = 0;
1402                                 break;
1403                         case 38: /* ITU T.416
1404                                   * Higher colour modes.
1405                                   * They break the usual properties of SGR codes
1406                                   * and thus need to be detected and ignored by
1407                                   * hand.  Strictly speaking, that standard also
1408                                   * wants : rather than ; as separators, contrary
1409                                   * to ECMA-48, but no one produces such codes
1410                                   * and almost no one accepts them.
1411                                   */
1412                                 i++;
1413                                 if (i > vc->vc_npar)
1414                                         break;
1415                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1416                                     i < vc->vc_npar) {     /* ubiquitous */
1417                                         i++;
1418                                         rgb_foreground(vc,
1419                                                 rgb_from_256(vc->vc_par[i]));
1420                                 } else if (vc->vc_par[i] == 2 &&  /* 24 bit */
1421                                            i <= vc->vc_npar + 3) {/* extremely rare */
1422                                         struct rgb c = {
1423                                                 .r = vc->vc_par[i + 1],
1424                                                 .g = vc->vc_par[i + 2],
1425                                                 .b = vc->vc_par[i + 3],
1426                                         };
1427                                         rgb_foreground(vc, c);
1428                                         i += 3;
1429                                 }
1430                                 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1431                                  * there's no point in supporting them.
1432                                  */
1433                                 break;
1434                         case 48:
1435                                 i++;
1436                                 if (i > vc->vc_npar)
1437                                         break;
1438                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1439                                     i < vc->vc_npar) {
1440                                         i++;
1441                                         rgb_background(vc,
1442                                                 rgb_from_256(vc->vc_par[i]));
1443                                 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1444                                            i <= vc->vc_npar + 3) {
1445                                         struct rgb c = {
1446                                                 .r = vc->vc_par[i + 1],
1447                                                 .g = vc->vc_par[i + 2],
1448                                                 .b = vc->vc_par[i + 3],
1449                                         };
1450                                         rgb_background(vc, c);
1451                                         i += 3;
1452                                 }
1453                                 break;
1454                         case 39:
1455                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1456                                 break;
1457                         case 49:
1458                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1459                                 break;
1460                         default:
1461                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1462                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1463                                                 | (vc->vc_color & 0xf0);
1464                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1465                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1466                                                 | (vc->vc_color & 0x0f);
1467                                 break;
1468                 }
1469         update_attr(vc);
1470 }
1471
1472 static void respond_string(const char *p, struct tty_port *port)
1473 {
1474         while (*p) {
1475                 tty_insert_flip_char(port, *p, 0);
1476                 p++;
1477         }
1478         tty_schedule_flip(port);
1479 }
1480
1481 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1482 {
1483         char buf[40];
1484
1485         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1486         respond_string(buf, tty->port);
1487 }
1488
1489 static inline void status_report(struct tty_struct *tty)
1490 {
1491         respond_string("\033[0n", tty->port);   /* Terminal ok */
1492 }
1493
1494 static inline void respond_ID(struct tty_struct *tty)
1495 {
1496         respond_string(VT102ID, tty->port);
1497 }
1498
1499 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1500 {
1501         char buf[8];
1502
1503         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1504                 (char)('!' + mry));
1505         respond_string(buf, tty->port);
1506 }
1507
1508 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1509 int mouse_reporting(void)
1510 {
1511         return vc_cons[fg_console].d->vc_report_mouse;
1512 }
1513
1514 /* console_lock is held */
1515 static void set_mode(struct vc_data *vc, int on_off)
1516 {
1517         int i;
1518
1519         for (i = 0; i <= vc->vc_npar; i++)
1520                 if (vc->vc_ques) {
1521                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1522                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1523                                 if (on_off)
1524                                         set_kbd(vc, decckm);
1525                                 else
1526                                         clr_kbd(vc, decckm);
1527                                 break;
1528                         case 3: /* 80/132 mode switch unimplemented */
1529                                 vc->vc_deccolm = on_off;
1530 #if 0
1531                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1532                                 /* this alone does not suffice; some user mode
1533                                    utility has to change the hardware regs */
1534 #endif
1535                                 break;
1536                         case 5:                 /* Inverted screen on/off */
1537                                 if (vc->vc_decscnm != on_off) {
1538                                         vc->vc_decscnm = on_off;
1539                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1540                                         update_attr(vc);
1541                                 }
1542                                 break;
1543                         case 6:                 /* Origin relative/absolute */
1544                                 vc->vc_decom = on_off;
1545                                 gotoxay(vc, 0, 0);
1546                                 break;
1547                         case 7:                 /* Autowrap on/off */
1548                                 vc->vc_decawm = on_off;
1549                                 break;
1550                         case 8:                 /* Autorepeat on/off */
1551                                 if (on_off)
1552                                         set_kbd(vc, decarm);
1553                                 else
1554                                         clr_kbd(vc, decarm);
1555                                 break;
1556                         case 9:
1557                                 vc->vc_report_mouse = on_off ? 1 : 0;
1558                                 break;
1559                         case 25:                /* Cursor on/off */
1560                                 vc->vc_deccm = on_off;
1561                                 break;
1562                         case 1000:
1563                                 vc->vc_report_mouse = on_off ? 2 : 0;
1564                                 break;
1565                         }
1566                 } else {
1567                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1568                         case 3:                 /* Monitor (display ctrls) */
1569                                 vc->vc_disp_ctrl = on_off;
1570                                 break;
1571                         case 4:                 /* Insert Mode on/off */
1572                                 vc->vc_decim = on_off;
1573                                 break;
1574                         case 20:                /* Lf, Enter == CrLf/Lf */
1575                                 if (on_off)
1576                                         set_kbd(vc, lnm);
1577                                 else
1578                                         clr_kbd(vc, lnm);
1579                                 break;
1580                         }
1581                 }
1582 }
1583
1584 /* console_lock is held */
1585 static void setterm_command(struct vc_data *vc)
1586 {
1587         switch(vc->vc_par[0]) {
1588                 case 1: /* set color for underline mode */
1589                         if (vc->vc_can_do_color &&
1590                                         vc->vc_par[1] < 16) {
1591                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1592                                 if (vc->vc_underline)
1593                                         update_attr(vc);
1594                         }
1595                         break;
1596                 case 2: /* set color for half intensity mode */
1597                         if (vc->vc_can_do_color &&
1598                                         vc->vc_par[1] < 16) {
1599                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1600                                 if (vc->vc_intensity == 0)
1601                                         update_attr(vc);
1602                         }
1603                         break;
1604                 case 8: /* store colors as defaults */
1605                         vc->vc_def_color = vc->vc_attr;
1606                         if (vc->vc_hi_font_mask == 0x100)
1607                                 vc->vc_def_color >>= 1;
1608                         default_attr(vc);
1609                         update_attr(vc);
1610                         break;
1611                 case 9: /* set blanking interval */
1612                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1613                         poke_blanked_console();
1614                         break;
1615                 case 10: /* set bell frequency in Hz */
1616                         if (vc->vc_npar >= 1)
1617                                 vc->vc_bell_pitch = vc->vc_par[1];
1618                         else
1619                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1620                         break;
1621                 case 11: /* set bell duration in msec */
1622                         if (vc->vc_npar >= 1)
1623                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1624                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1625                         else
1626                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1627                         break;
1628                 case 12: /* bring specified console to the front */
1629                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1630                                 set_console(vc->vc_par[1] - 1);
1631                         break;
1632                 case 13: /* unblank the screen */
1633                         poke_blanked_console();
1634                         break;
1635                 case 14: /* set vesa powerdown interval */
1636                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1637                         break;
1638                 case 15: /* activate the previous console */
1639                         set_console(last_console);
1640                         break;
1641                 case 16: /* set cursor blink duration in msec */
1642                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1643                                         vc->vc_par[1] <= USHRT_MAX)
1644                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1645                         else
1646                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1647                         break;
1648         }
1649 }
1650
1651 /* console_lock is held */
1652 static void csi_at(struct vc_data *vc, unsigned int nr)
1653 {
1654         if (nr > vc->vc_cols - vc->vc_x)
1655                 nr = vc->vc_cols - vc->vc_x;
1656         else if (!nr)
1657                 nr = 1;
1658         insert_char(vc, nr);
1659 }
1660
1661 /* console_lock is held */
1662 static void csi_L(struct vc_data *vc, unsigned int nr)
1663 {
1664         if (nr > vc->vc_rows - vc->vc_y)
1665                 nr = vc->vc_rows - vc->vc_y;
1666         else if (!nr)
1667                 nr = 1;
1668         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1669         vc->vc_need_wrap = 0;
1670 }
1671
1672 /* console_lock is held */
1673 static void csi_P(struct vc_data *vc, unsigned int nr)
1674 {
1675         if (nr > vc->vc_cols - vc->vc_x)
1676                 nr = vc->vc_cols - vc->vc_x;
1677         else if (!nr)
1678                 nr = 1;
1679         delete_char(vc, nr);
1680 }
1681
1682 /* console_lock is held */
1683 static void csi_M(struct vc_data *vc, unsigned int nr)
1684 {
1685         if (nr > vc->vc_rows - vc->vc_y)
1686                 nr = vc->vc_rows - vc->vc_y;
1687         else if (!nr)
1688                 nr=1;
1689         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1690         vc->vc_need_wrap = 0;
1691 }
1692
1693 /* console_lock is held (except via vc_init->reset_terminal */
1694 static void save_cur(struct vc_data *vc)
1695 {
1696         vc->vc_saved_x          = vc->vc_x;
1697         vc->vc_saved_y          = vc->vc_y;
1698         vc->vc_s_intensity      = vc->vc_intensity;
1699         vc->vc_s_italic         = vc->vc_italic;
1700         vc->vc_s_underline      = vc->vc_underline;
1701         vc->vc_s_blink          = vc->vc_blink;
1702         vc->vc_s_reverse        = vc->vc_reverse;
1703         vc->vc_s_charset        = vc->vc_charset;
1704         vc->vc_s_color          = vc->vc_color;
1705         vc->vc_saved_G0         = vc->vc_G0_charset;
1706         vc->vc_saved_G1         = vc->vc_G1_charset;
1707 }
1708
1709 /* console_lock is held */
1710 static void restore_cur(struct vc_data *vc)
1711 {
1712         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1713         vc->vc_intensity        = vc->vc_s_intensity;
1714         vc->vc_italic           = vc->vc_s_italic;
1715         vc->vc_underline        = vc->vc_s_underline;
1716         vc->vc_blink            = vc->vc_s_blink;
1717         vc->vc_reverse          = vc->vc_s_reverse;
1718         vc->vc_charset          = vc->vc_s_charset;
1719         vc->vc_color            = vc->vc_s_color;
1720         vc->vc_G0_charset       = vc->vc_saved_G0;
1721         vc->vc_G1_charset       = vc->vc_saved_G1;
1722         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1723         update_attr(vc);
1724         vc->vc_need_wrap = 0;
1725 }
1726
1727 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1728         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1729         ESpalette, ESosc };
1730
1731 /* console_lock is held (except via vc_init()) */
1732 static void reset_terminal(struct vc_data *vc, int do_clear)
1733 {
1734         vc->vc_top              = 0;
1735         vc->vc_bottom           = vc->vc_rows;
1736         vc->vc_state            = ESnormal;
1737         vc->vc_ques             = 0;
1738         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1739         vc->vc_G0_charset       = LAT1_MAP;
1740         vc->vc_G1_charset       = GRAF_MAP;
1741         vc->vc_charset          = 0;
1742         vc->vc_need_wrap        = 0;
1743         vc->vc_report_mouse     = 0;
1744         vc->vc_utf              = default_utf8;
1745         vc->vc_utf_count        = 0;
1746
1747         vc->vc_disp_ctrl        = 0;
1748         vc->vc_toggle_meta      = 0;
1749
1750         vc->vc_decscnm          = 0;
1751         vc->vc_decom            = 0;
1752         vc->vc_decawm           = 1;
1753         vc->vc_deccm            = global_cursor_default;
1754         vc->vc_decim            = 0;
1755
1756         vt_reset_keyboard(vc->vc_num);
1757
1758         vc->vc_cursor_type = cur_default;
1759         vc->vc_complement_mask = vc->vc_s_complement_mask;
1760
1761         default_attr(vc);
1762         update_attr(vc);
1763
1764         vc->vc_tab_stop[0]      =
1765         vc->vc_tab_stop[1]      =
1766         vc->vc_tab_stop[2]      =
1767         vc->vc_tab_stop[3]      =
1768         vc->vc_tab_stop[4]      =
1769         vc->vc_tab_stop[5]      =
1770         vc->vc_tab_stop[6]      =
1771         vc->vc_tab_stop[7]      = 0x01010101;
1772
1773         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1774         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1775         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1776
1777         gotoxy(vc, 0, 0);
1778         save_cur(vc);
1779         if (do_clear)
1780             csi_J(vc, 2);
1781 }
1782
1783 /* console_lock is held */
1784 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1785 {
1786         /*
1787          *  Control characters can be used in the _middle_
1788          *  of an escape sequence.
1789          */
1790         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1791                 return;
1792         switch (c) {
1793         case 0:
1794                 return;
1795         case 7:
1796                 if (vc->vc_state == ESosc)
1797                         vc->vc_state = ESnormal;
1798                 else if (vc->vc_bell_duration)
1799                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1800                 return;
1801         case 8:
1802                 bs(vc);
1803                 return;
1804         case 9:
1805                 vc->vc_pos -= (vc->vc_x << 1);
1806                 while (vc->vc_x < vc->vc_cols - 1) {
1807                         vc->vc_x++;
1808                         if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1809                                 break;
1810                 }
1811                 vc->vc_pos += (vc->vc_x << 1);
1812                 notify_write(vc, '\t');
1813                 return;
1814         case 10: case 11: case 12:
1815                 lf(vc);
1816                 if (!is_kbd(vc, lnm))
1817                         return;
1818         case 13:
1819                 cr(vc);
1820                 return;
1821         case 14:
1822                 vc->vc_charset = 1;
1823                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1824                 vc->vc_disp_ctrl = 1;
1825                 return;
1826         case 15:
1827                 vc->vc_charset = 0;
1828                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1829                 vc->vc_disp_ctrl = 0;
1830                 return;
1831         case 24: case 26:
1832                 vc->vc_state = ESnormal;
1833                 return;
1834         case 27:
1835                 vc->vc_state = ESesc;
1836                 return;
1837         case 127:
1838                 del(vc);
1839                 return;
1840         case 128+27:
1841                 vc->vc_state = ESsquare;
1842                 return;
1843         }
1844         switch(vc->vc_state) {
1845         case ESesc:
1846                 vc->vc_state = ESnormal;
1847                 switch (c) {
1848                 case '[':
1849                         vc->vc_state = ESsquare;
1850                         return;
1851                 case ']':
1852                         vc->vc_state = ESnonstd;
1853                         return;
1854                 case '%':
1855                         vc->vc_state = ESpercent;
1856                         return;
1857                 case 'E':
1858                         cr(vc);
1859                         lf(vc);
1860                         return;
1861                 case 'M':
1862                         ri(vc);
1863                         return;
1864                 case 'D':
1865                         lf(vc);
1866                         return;
1867                 case 'H':
1868                         vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1869                         return;
1870                 case 'Z':
1871                         respond_ID(tty);
1872                         return;
1873                 case '7':
1874                         save_cur(vc);
1875                         return;
1876                 case '8':
1877                         restore_cur(vc);
1878                         return;
1879                 case '(':
1880                         vc->vc_state = ESsetG0;
1881                         return;
1882                 case ')':
1883                         vc->vc_state = ESsetG1;
1884                         return;
1885                 case '#':
1886                         vc->vc_state = EShash;
1887                         return;
1888                 case 'c':
1889                         reset_terminal(vc, 1);
1890                         return;
1891                 case '>':  /* Numeric keypad */
1892                         clr_kbd(vc, kbdapplic);
1893                         return;
1894                 case '=':  /* Appl. keypad */
1895                         set_kbd(vc, kbdapplic);
1896                         return;
1897                 }
1898                 return;
1899         case ESnonstd:
1900                 if (c=='P') {   /* palette escape sequence */
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 = ESpalette;
1905                         return;
1906                 } else if (c=='R') {   /* reset palette */
1907                         reset_palette(vc);
1908                         vc->vc_state = ESnormal;
1909                 } else if (c>='0' && c<='9')
1910                         vc->vc_state = ESosc;
1911                 else
1912                         vc->vc_state = ESnormal;
1913                 return;
1914         case ESpalette:
1915                 if (isxdigit(c)) {
1916                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1917                         if (vc->vc_npar == 7) {
1918                                 int i = vc->vc_par[0] * 3, j = 1;
1919                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1920                                 vc->vc_palette[i++] += vc->vc_par[j++];
1921                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1922                                 vc->vc_palette[i++] += vc->vc_par[j++];
1923                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1924                                 vc->vc_palette[i] += vc->vc_par[j];
1925                                 set_palette(vc);
1926                                 vc->vc_state = ESnormal;
1927                         }
1928                 } else
1929                         vc->vc_state = ESnormal;
1930                 return;
1931         case ESsquare:
1932                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1933                         vc->vc_par[vc->vc_npar] = 0;
1934                 vc->vc_npar = 0;
1935                 vc->vc_state = ESgetpars;
1936                 if (c == '[') { /* Function key */
1937                         vc->vc_state=ESfunckey;
1938                         return;
1939                 }
1940                 vc->vc_ques = (c == '?');
1941                 if (vc->vc_ques)
1942                         return;
1943         case ESgetpars:
1944                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1945                         vc->vc_npar++;
1946                         return;
1947                 } else if (c>='0' && c<='9') {
1948                         vc->vc_par[vc->vc_npar] *= 10;
1949                         vc->vc_par[vc->vc_npar] += c - '0';
1950                         return;
1951                 }
1952                 vc->vc_state = ESnormal;
1953                 switch(c) {
1954                 case 'h':
1955                         set_mode(vc, 1);
1956                         return;
1957                 case 'l':
1958                         set_mode(vc, 0);
1959                         return;
1960                 case 'c':
1961                         if (vc->vc_ques) {
1962                                 if (vc->vc_par[0])
1963                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1964                                 else
1965                                         vc->vc_cursor_type = cur_default;
1966                                 return;
1967                         }
1968                         break;
1969                 case 'm':
1970                         if (vc->vc_ques) {
1971                                 clear_selection();
1972                                 if (vc->vc_par[0])
1973                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1974                                 else
1975                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1976                                 return;
1977                         }
1978                         break;
1979                 case 'n':
1980                         if (!vc->vc_ques) {
1981                                 if (vc->vc_par[0] == 5)
1982                                         status_report(tty);
1983                                 else if (vc->vc_par[0] == 6)
1984                                         cursor_report(vc, tty);
1985                         }
1986                         return;
1987                 }
1988                 if (vc->vc_ques) {
1989                         vc->vc_ques = 0;
1990                         return;
1991                 }
1992                 switch(c) {
1993                 case 'G': case '`':
1994                         if (vc->vc_par[0])
1995                                 vc->vc_par[0]--;
1996                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1997                         return;
1998                 case 'A':
1999                         if (!vc->vc_par[0])
2000                                 vc->vc_par[0]++;
2001                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2002                         return;
2003                 case 'B': case 'e':
2004                         if (!vc->vc_par[0])
2005                                 vc->vc_par[0]++;
2006                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2007                         return;
2008                 case 'C': case 'a':
2009                         if (!vc->vc_par[0])
2010                                 vc->vc_par[0]++;
2011                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2012                         return;
2013                 case 'D':
2014                         if (!vc->vc_par[0])
2015                                 vc->vc_par[0]++;
2016                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2017                         return;
2018                 case 'E':
2019                         if (!vc->vc_par[0])
2020                                 vc->vc_par[0]++;
2021                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2022                         return;
2023                 case 'F':
2024                         if (!vc->vc_par[0])
2025                                 vc->vc_par[0]++;
2026                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2027                         return;
2028                 case 'd':
2029                         if (vc->vc_par[0])
2030                                 vc->vc_par[0]--;
2031                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2032                         return;
2033                 case 'H': case 'f':
2034                         if (vc->vc_par[0])
2035                                 vc->vc_par[0]--;
2036                         if (vc->vc_par[1])
2037                                 vc->vc_par[1]--;
2038                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2039                         return;
2040                 case 'J':
2041                         csi_J(vc, vc->vc_par[0]);
2042                         return;
2043                 case 'K':
2044                         csi_K(vc, vc->vc_par[0]);
2045                         return;
2046                 case 'L':
2047                         csi_L(vc, vc->vc_par[0]);
2048                         return;
2049                 case 'M':
2050                         csi_M(vc, vc->vc_par[0]);
2051                         return;
2052                 case 'P':
2053                         csi_P(vc, vc->vc_par[0]);
2054                         return;
2055                 case 'c':
2056                         if (!vc->vc_par[0])
2057                                 respond_ID(tty);
2058                         return;
2059                 case 'g':
2060                         if (!vc->vc_par[0])
2061                                 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2062                         else if (vc->vc_par[0] == 3) {
2063                                 vc->vc_tab_stop[0] =
2064                                         vc->vc_tab_stop[1] =
2065                                         vc->vc_tab_stop[2] =
2066                                         vc->vc_tab_stop[3] =
2067                                         vc->vc_tab_stop[4] =
2068                                         vc->vc_tab_stop[5] =
2069                                         vc->vc_tab_stop[6] =
2070                                         vc->vc_tab_stop[7] = 0;
2071                         }
2072                         return;
2073                 case 'm':
2074                         csi_m(vc);
2075                         return;
2076                 case 'q': /* DECLL - but only 3 leds */
2077                         /* map 0,1,2,3 to 0,1,2,4 */
2078                         if (vc->vc_par[0] < 4)
2079                                 vt_set_led_state(vc->vc_num,
2080                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2081                         return;
2082                 case 'r':
2083                         if (!vc->vc_par[0])
2084                                 vc->vc_par[0]++;
2085                         if (!vc->vc_par[1])
2086                                 vc->vc_par[1] = vc->vc_rows;
2087                         /* Minimum allowed region is 2 lines */
2088                         if (vc->vc_par[0] < vc->vc_par[1] &&
2089                             vc->vc_par[1] <= vc->vc_rows) {
2090                                 vc->vc_top = vc->vc_par[0] - 1;
2091                                 vc->vc_bottom = vc->vc_par[1];
2092                                 gotoxay(vc, 0, 0);
2093                         }
2094                         return;
2095                 case 's':
2096                         save_cur(vc);
2097                         return;
2098                 case 'u':
2099                         restore_cur(vc);
2100                         return;
2101                 case 'X':
2102                         csi_X(vc, vc->vc_par[0]);
2103                         return;
2104                 case '@':
2105                         csi_at(vc, vc->vc_par[0]);
2106                         return;
2107                 case ']': /* setterm functions */
2108                         setterm_command(vc);
2109                         return;
2110                 }
2111                 return;
2112         case ESpercent:
2113                 vc->vc_state = ESnormal;
2114                 switch (c) {
2115                 case '@':  /* defined in ISO 2022 */
2116                         vc->vc_utf = 0;
2117                         return;
2118                 case 'G':  /* prelim official escape code */
2119                 case '8':  /* retained for compatibility */
2120                         vc->vc_utf = 1;
2121                         return;
2122                 }
2123                 return;
2124         case ESfunckey:
2125                 vc->vc_state = ESnormal;
2126                 return;
2127         case EShash:
2128                 vc->vc_state = ESnormal;
2129                 if (c == '8') {
2130                         /* DEC screen alignment test. kludge :-) */
2131                         vc->vc_video_erase_char =
2132                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2133                         csi_J(vc, 2);
2134                         vc->vc_video_erase_char =
2135                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2136                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2137                 }
2138                 return;
2139         case ESsetG0:
2140                 if (c == '0')
2141                         vc->vc_G0_charset = GRAF_MAP;
2142                 else if (c == 'B')
2143                         vc->vc_G0_charset = LAT1_MAP;
2144                 else if (c == 'U')
2145                         vc->vc_G0_charset = IBMPC_MAP;
2146                 else if (c == 'K')
2147                         vc->vc_G0_charset = USER_MAP;
2148                 if (vc->vc_charset == 0)
2149                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2150                 vc->vc_state = ESnormal;
2151                 return;
2152         case ESsetG1:
2153                 if (c == '0')
2154                         vc->vc_G1_charset = GRAF_MAP;
2155                 else if (c == 'B')
2156                         vc->vc_G1_charset = LAT1_MAP;
2157                 else if (c == 'U')
2158                         vc->vc_G1_charset = IBMPC_MAP;
2159                 else if (c == 'K')
2160                         vc->vc_G1_charset = USER_MAP;
2161                 if (vc->vc_charset == 1)
2162                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2163                 vc->vc_state = ESnormal;
2164                 return;
2165         case ESosc:
2166                 return;
2167         default:
2168                 vc->vc_state = ESnormal;
2169         }
2170 }
2171
2172 /* is_double_width() is based on the wcwidth() implementation by
2173  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2174  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2175  */
2176 struct interval {
2177         uint32_t first;
2178         uint32_t last;
2179 };
2180
2181 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2182 {
2183         int min = 0;
2184         int mid;
2185
2186         if (ucs < table[0].first || ucs > table[max].last)
2187                 return 0;
2188         while (max >= min) {
2189                 mid = (min + max) / 2;
2190                 if (ucs > table[mid].last)
2191                         min = mid + 1;
2192                 else if (ucs < table[mid].first)
2193                         max = mid - 1;
2194                 else
2195                         return 1;
2196         }
2197         return 0;
2198 }
2199
2200 static int is_double_width(uint32_t ucs)
2201 {
2202         static const struct interval double_width[] = {
2203                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2204                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2205                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2206                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2207         };
2208         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2209 }
2210
2211 /* acquires console_lock */
2212 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2213 {
2214 #ifdef VT_BUF_VRAM_ONLY
2215 #define FLUSH do { } while(0);
2216 #else
2217 #define FLUSH if (draw_x >= 0) { \
2218         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2219         draw_x = -1; \
2220         }
2221 #endif
2222
2223         int c, tc, ok, n = 0, draw_x = -1;
2224         unsigned int currcons;
2225         unsigned long draw_from = 0, draw_to = 0;
2226         struct vc_data *vc;
2227         unsigned char vc_attr;
2228         struct vt_notifier_param param;
2229         uint8_t rescan;
2230         uint8_t inverse;
2231         uint8_t width;
2232         u16 himask, charmask;
2233
2234         if (in_interrupt())
2235                 return count;
2236
2237         might_sleep();
2238
2239         console_lock();
2240         vc = tty->driver_data;
2241         if (vc == NULL) {
2242                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2243                 console_unlock();
2244                 return 0;
2245         }
2246
2247         currcons = vc->vc_num;
2248         if (!vc_cons_allocated(currcons)) {
2249                 /* could this happen? */
2250                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2251                 console_unlock();
2252                 return 0;
2253         }
2254
2255         himask = vc->vc_hi_font_mask;
2256         charmask = himask ? 0x1ff : 0xff;
2257
2258         /* undraw cursor first */
2259         if (IS_FG(vc))
2260                 hide_cursor(vc);
2261
2262         param.vc = vc;
2263
2264         while (!tty->stopped && count) {
2265                 int orig = *buf;
2266                 c = orig;
2267                 buf++;
2268                 n++;
2269                 count--;
2270                 rescan = 0;
2271                 inverse = 0;
2272                 width = 1;
2273
2274                 /* Do no translation at all in control states */
2275                 if (vc->vc_state != ESnormal) {
2276                         tc = c;
2277                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2278                     /* Combine UTF-8 into Unicode in vc_utf_char.
2279                      * vc_utf_count is the number of continuation bytes still
2280                      * expected to arrive.
2281                      * vc_npar is the number of continuation bytes arrived so
2282                      * far
2283                      */
2284 rescan_last_byte:
2285                     if ((c & 0xc0) == 0x80) {
2286                         /* Continuation byte received */
2287                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2288                         if (vc->vc_utf_count) {
2289                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2290                             vc->vc_npar++;
2291                             if (--vc->vc_utf_count) {
2292                                 /* Still need some bytes */
2293                                 continue;
2294                             }
2295                             /* Got a whole character */
2296                             c = vc->vc_utf_char;
2297                             /* Reject overlong sequences */
2298                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2299                                         c > utf8_length_changes[vc->vc_npar])
2300                                 c = 0xfffd;
2301                         } else {
2302                             /* Unexpected continuation byte */
2303                             vc->vc_utf_count = 0;
2304                             c = 0xfffd;
2305                         }
2306                     } else {
2307                         /* Single ASCII byte or first byte of a sequence received */
2308                         if (vc->vc_utf_count) {
2309                             /* Continuation byte expected */
2310                             rescan = 1;
2311                             vc->vc_utf_count = 0;
2312                             c = 0xfffd;
2313                         } else if (c > 0x7f) {
2314                             /* First byte of a multibyte sequence received */
2315                             vc->vc_npar = 0;
2316                             if ((c & 0xe0) == 0xc0) {
2317                                 vc->vc_utf_count = 1;
2318                                 vc->vc_utf_char = (c & 0x1f);
2319                             } else if ((c & 0xf0) == 0xe0) {
2320                                 vc->vc_utf_count = 2;
2321                                 vc->vc_utf_char = (c & 0x0f);
2322                             } else if ((c & 0xf8) == 0xf0) {
2323                                 vc->vc_utf_count = 3;
2324                                 vc->vc_utf_char = (c & 0x07);
2325                             } else if ((c & 0xfc) == 0xf8) {
2326                                 vc->vc_utf_count = 4;
2327                                 vc->vc_utf_char = (c & 0x03);
2328                             } else if ((c & 0xfe) == 0xfc) {
2329                                 vc->vc_utf_count = 5;
2330                                 vc->vc_utf_char = (c & 0x01);
2331                             } else {
2332                                 /* 254 and 255 are invalid */
2333                                 c = 0xfffd;
2334                             }
2335                             if (vc->vc_utf_count) {
2336                                 /* Still need some bytes */
2337                                 continue;
2338                             }
2339                         }
2340                         /* Nothing to do if an ASCII byte was received */
2341                     }
2342                     /* End of UTF-8 decoding. */
2343                     /* c is the received character, or U+FFFD for invalid sequences. */
2344                     /* Replace invalid Unicode code points with U+FFFD too */
2345                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2346                         c = 0xfffd;
2347                     tc = c;
2348                 } else {        /* no utf or alternate charset mode */
2349                     tc = vc_translate(vc, c);
2350                 }
2351
2352                 param.c = tc;
2353                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2354                                         &param) == NOTIFY_STOP)
2355                         continue;
2356
2357                 /* If the original code was a control character we
2358                  * only allow a glyph to be displayed if the code is
2359                  * not normally used (such as for cursor movement) or
2360                  * if the disp_ctrl mode has been explicitly enabled.
2361                  * Certain characters (as given by the CTRL_ALWAYS
2362                  * bitmap) are always displayed as control characters,
2363                  * as the console would be pretty useless without
2364                  * them; to display an arbitrary font position use the
2365                  * direct-to-font zone in UTF-8 mode.
2366                  */
2367                 ok = tc && (c >= 32 ||
2368                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2369                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2370                         && (c != 127 || vc->vc_disp_ctrl)
2371                         && (c != 128+27);
2372
2373                 if (vc->vc_state == ESnormal && ok) {
2374                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2375                                 if (is_double_width(c))
2376                                         width = 2;
2377                         }
2378                         /* Now try to find out how to display it */
2379                         tc = conv_uni_to_pc(vc, tc);
2380                         if (tc & ~charmask) {
2381                                 if (tc == -1 || tc == -2) {
2382                                     continue; /* nothing to display */
2383                                 }
2384                                 /* Glyph not found */
2385                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2386                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2387                                        This would make absolutely no sense with Unicode in mind,
2388                                        but do this for ASCII characters since a font may lack
2389                                        Unicode mapping info and we don't want to end up with
2390                                        having question marks only. */
2391                                     tc = c;
2392                                 } else {
2393                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2394                                     tc = conv_uni_to_pc(vc, 0xfffd);
2395                                     if (tc < 0) {
2396                                         inverse = 1;
2397                                         tc = conv_uni_to_pc(vc, '?');
2398                                         if (tc < 0) tc = '?';
2399                                     }
2400                                 }
2401                         }
2402
2403                         if (!inverse) {
2404                                 vc_attr = vc->vc_attr;
2405                         } else {
2406                                 /* invert vc_attr */
2407                                 if (!vc->vc_can_do_color) {
2408                                         vc_attr = (vc->vc_attr) ^ 0x08;
2409                                 } else if (vc->vc_hi_font_mask == 0x100) {
2410                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2411                                 } else {
2412                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2413                                 }
2414                                 FLUSH
2415                         }
2416
2417                         while (1) {
2418                                 if (vc->vc_need_wrap || vc->vc_decim)
2419                                         FLUSH
2420                                 if (vc->vc_need_wrap) {
2421                                         cr(vc);
2422                                         lf(vc);
2423                                 }
2424                                 if (vc->vc_decim)
2425                                         insert_char(vc, 1);
2426                                 scr_writew(himask ?
2427                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2428                                              (vc_attr << 8) + tc,
2429                                            (u16 *) vc->vc_pos);
2430                                 if (DO_UPDATE(vc) && draw_x < 0) {
2431                                         draw_x = vc->vc_x;
2432                                         draw_from = vc->vc_pos;
2433                                 }
2434                                 if (vc->vc_x == vc->vc_cols - 1) {
2435                                         vc->vc_need_wrap = vc->vc_decawm;
2436                                         draw_to = vc->vc_pos + 2;
2437                                 } else {
2438                                         vc->vc_x++;
2439                                         draw_to = (vc->vc_pos += 2);
2440                                 }
2441
2442                                 if (!--width) break;
2443
2444                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2445                                 if (tc < 0) tc = ' ';
2446                         }
2447                         notify_write(vc, c);
2448
2449                         if (inverse) {
2450                                 FLUSH
2451                         }
2452
2453                         if (rescan) {
2454                                 rescan = 0;
2455                                 inverse = 0;
2456                                 width = 1;
2457                                 c = orig;
2458                                 goto rescan_last_byte;
2459                         }
2460                         continue;
2461                 }
2462                 FLUSH
2463                 do_con_trol(tty, vc, orig);
2464         }
2465         FLUSH
2466         console_conditional_schedule();
2467         console_unlock();
2468         notify_update(vc);
2469         return n;
2470 #undef FLUSH
2471 }
2472
2473 /*
2474  * This is the console switching callback.
2475  *
2476  * Doing console switching in a process context allows
2477  * us to do the switches asynchronously (needed when we want
2478  * to switch due to a keyboard interrupt).  Synchronization
2479  * with other console code and prevention of re-entrancy is
2480  * ensured with console_lock.
2481  */
2482 static void console_callback(struct work_struct *ignored)
2483 {
2484         console_lock();
2485
2486         if (want_console >= 0) {
2487                 if (want_console != fg_console &&
2488                     vc_cons_allocated(want_console)) {
2489                         hide_cursor(vc_cons[fg_console].d);
2490                         change_console(vc_cons[want_console].d);
2491                         /* we only changed when the console had already
2492                            been allocated - a new console is not created
2493                            in an interrupt routine */
2494                 }
2495                 want_console = -1;
2496         }
2497         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2498                 do_poke_blanked_console = 0;
2499                 poke_blanked_console();
2500         }
2501         if (scrollback_delta) {
2502                 struct vc_data *vc = vc_cons[fg_console].d;
2503                 clear_selection();
2504                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2505                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2506                 scrollback_delta = 0;
2507         }
2508         if (blank_timer_expired) {
2509                 do_blank_screen(0);
2510                 blank_timer_expired = 0;
2511         }
2512         notify_update(vc_cons[fg_console].d);
2513
2514         console_unlock();
2515 }
2516
2517 int set_console(int nr)
2518 {
2519         struct vc_data *vc = vc_cons[fg_console].d;
2520
2521         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2522                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2523
2524                 /*
2525                  * Console switch will fail in console_callback() or
2526                  * change_console() so there is no point scheduling
2527                  * the callback
2528                  *
2529                  * Existing set_console() users don't check the return
2530                  * value so this shouldn't break anything
2531                  */
2532                 return -EINVAL;
2533         }
2534
2535         want_console = nr;
2536         schedule_console_callback();
2537
2538         return 0;
2539 }
2540
2541 struct tty_driver *console_driver;
2542
2543 #ifdef CONFIG_VT_CONSOLE
2544
2545 /**
2546  * vt_kmsg_redirect() - Sets/gets the kernel message console
2547  * @new:        The new virtual terminal number or -1 if the console should stay
2548  *              unchanged
2549  *
2550  * By default, the kernel messages are always printed on the current virtual
2551  * console. However, the user may modify that default with the
2552  * TIOCL_SETKMSGREDIRECT ioctl call.
2553  *
2554  * This function sets the kernel message console to be @new. It returns the old
2555  * virtual console number. The virtual terminal number 0 (both as parameter and
2556  * return value) means no redirection (i.e. always printed on the currently
2557  * active console).
2558  *
2559  * The parameter -1 means that only the current console is returned, but the
2560  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2561  * case to make the code more understandable.
2562  *
2563  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2564  * the parameter and always returns 0.
2565  */
2566 int vt_kmsg_redirect(int new)
2567 {
2568         static int kmsg_con;
2569
2570         if (new != -1)
2571                 return xchg(&kmsg_con, new);
2572         else
2573                 return kmsg_con;
2574 }
2575
2576 /*
2577  *      Console on virtual terminal
2578  *
2579  * The console must be locked when we get here.
2580  */
2581
2582 static void vt_console_print(struct console *co, const char *b, unsigned count)
2583 {
2584         struct vc_data *vc = vc_cons[fg_console].d;
2585         unsigned char c;
2586         static DEFINE_SPINLOCK(printing_lock);
2587         const ushort *start;
2588         ushort cnt = 0;
2589         ushort myx;
2590         int kmsg_console;
2591
2592         /* console busy or not yet initialized */
2593         if (!printable)
2594                 return;
2595         if (!spin_trylock(&printing_lock))
2596                 return;
2597
2598         kmsg_console = vt_get_kmsg_redirect();
2599         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2600                 vc = vc_cons[kmsg_console - 1].d;
2601
2602         /* read `x' only after setting currcons properly (otherwise
2603            the `x' macro will read the x of the foreground console). */
2604         myx = vc->vc_x;
2605
2606         if (!vc_cons_allocated(fg_console)) {
2607                 /* impossible */
2608                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2609                 goto quit;
2610         }
2611
2612         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2613                 goto quit;
2614
2615         /* undraw cursor first */
2616         if (IS_FG(vc))
2617                 hide_cursor(vc);
2618
2619         start = (ushort *)vc->vc_pos;
2620
2621         /* Contrived structure to try to emulate original need_wrap behaviour
2622          * Problems caused when we have need_wrap set on '\n' character */
2623         while (count--) {
2624                 c = *b++;
2625                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2626                         if (cnt > 0) {
2627                                 if (CON_IS_VISIBLE(vc))
2628                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2629                                 vc->vc_x += cnt;
2630                                 if (vc->vc_need_wrap)
2631                                         vc->vc_x--;
2632                                 cnt = 0;
2633                         }
2634                         if (c == 8) {           /* backspace */
2635                                 bs(vc);
2636                                 start = (ushort *)vc->vc_pos;
2637                                 myx = vc->vc_x;
2638                                 continue;
2639                         }
2640                         if (c != 13)
2641                                 lf(vc);
2642                         cr(vc);
2643                         start = (ushort *)vc->vc_pos;
2644                         myx = vc->vc_x;
2645                         if (c == 10 || c == 13)
2646                                 continue;
2647                 }
2648                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2649                 notify_write(vc, c);
2650                 cnt++;
2651                 if (myx == vc->vc_cols - 1) {
2652                         vc->vc_need_wrap = 1;
2653                         continue;
2654                 }
2655                 vc->vc_pos += 2;
2656                 myx++;
2657         }
2658         if (cnt > 0) {
2659                 if (CON_IS_VISIBLE(vc))
2660                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2661                 vc->vc_x += cnt;
2662                 if (vc->vc_x == vc->vc_cols) {
2663                         vc->vc_x--;
2664                         vc->vc_need_wrap = 1;
2665                 }
2666         }
2667         set_cursor(vc);
2668         notify_update(vc);
2669
2670 quit:
2671         spin_unlock(&printing_lock);
2672 }
2673
2674 static struct tty_driver *vt_console_device(struct console *c, int *index)
2675 {
2676         *index = c->index ? c->index-1 : fg_console;
2677         return console_driver;
2678 }
2679
2680 static struct console vt_console_driver = {
2681         .name           = "tty",
2682         .write          = vt_console_print,
2683         .device         = vt_console_device,
2684         .unblank        = unblank_screen,
2685         .flags          = CON_PRINTBUFFER,
2686         .index          = -1,
2687 };
2688 #endif
2689
2690 /*
2691  *      Handling of Linux-specific VC ioctls
2692  */
2693
2694 /*
2695  * Generally a bit racy with respect to console_lock();.
2696  *
2697  * There are some functions which don't need it.
2698  *
2699  * There are some functions which can sleep for arbitrary periods
2700  * (paste_selection) but we don't need the lock there anyway.
2701  *
2702  * set_selection has locking, and definitely needs it
2703  */
2704
2705 int tioclinux(struct tty_struct *tty, unsigned long arg)
2706 {
2707         char type, data;
2708         char __user *p = (char __user *)arg;
2709         int lines;
2710         int ret;
2711
2712         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2713                 return -EPERM;
2714         if (get_user(type, p))
2715                 return -EFAULT;
2716         ret = 0;
2717
2718         switch (type)
2719         {
2720                 case TIOCL_SETSEL:
2721                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2722                         break;
2723                 case TIOCL_PASTESEL:
2724                         ret = paste_selection(tty);
2725                         break;
2726                 case TIOCL_UNBLANKSCREEN:
2727                         console_lock();
2728                         unblank_screen();
2729                         console_unlock();
2730                         break;
2731                 case TIOCL_SELLOADLUT:
2732                         console_lock();
2733                         ret = sel_loadlut(p);
2734                         console_unlock();
2735                         break;
2736                 case TIOCL_GETSHIFTSTATE:
2737
2738         /*
2739          * Make it possible to react to Shift+Mousebutton.
2740          * Note that 'shift_state' is an undocumented
2741          * kernel-internal variable; programs not closely
2742          * related to the kernel should not use this.
2743          */
2744                         data = vt_get_shift_state();
2745                         ret = put_user(data, p);
2746                         break;
2747                 case TIOCL_GETMOUSEREPORTING:
2748                         console_lock(); /* May be overkill */
2749                         data = mouse_reporting();
2750                         console_unlock();
2751                         ret = put_user(data, p);
2752                         break;
2753                 case TIOCL_SETVESABLANK:
2754                         console_lock();
2755                         ret = set_vesa_blanking(p);
2756                         console_unlock();
2757                         break;
2758                 case TIOCL_GETKMSGREDIRECT:
2759                         data = vt_get_kmsg_redirect();
2760                         ret = put_user(data, p);
2761                         break;
2762                 case TIOCL_SETKMSGREDIRECT:
2763                         if (!capable(CAP_SYS_ADMIN)) {
2764                                 ret = -EPERM;
2765                         } else {
2766                                 if (get_user(data, p+1))
2767                                         ret = -EFAULT;
2768                                 else
2769                                         vt_kmsg_redirect(data);
2770                         }
2771                         break;
2772                 case TIOCL_GETFGCONSOLE:
2773                         /* No locking needed as this is a transiently
2774                            correct return anyway if the caller hasn't
2775                            disabled switching */
2776                         ret = fg_console;
2777                         break;
2778                 case TIOCL_SCROLLCONSOLE:
2779                         if (get_user(lines, (s32 __user *)(p+4))) {
2780                                 ret = -EFAULT;
2781                         } else {
2782                                 /* Need the console lock here. Note that lots
2783                                    of other calls need fixing before the lock
2784                                    is actually useful ! */
2785                                 console_lock();
2786                                 scrollfront(vc_cons[fg_console].d, lines);
2787                                 console_unlock();
2788                                 ret = 0;
2789                         }
2790                         break;
2791                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2792                         console_lock();
2793                         ignore_poke = 1;
2794                         do_blank_screen(0);
2795                         console_unlock();
2796                         break;
2797                 case TIOCL_BLANKEDSCREEN:
2798                         ret = console_blanked;
2799                         break;
2800                 default:
2801                         ret = -EINVAL;
2802                         break;
2803         }
2804         return ret;
2805 }
2806
2807 /*
2808  * /dev/ttyN handling
2809  */
2810
2811 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2812 {
2813         int     retval;
2814
2815         retval = do_con_write(tty, buf, count);
2816         con_flush_chars(tty);
2817
2818         return retval;
2819 }
2820
2821 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2822 {
2823         if (in_interrupt())
2824                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2825         return do_con_write(tty, &ch, 1);
2826 }
2827
2828 static int con_write_room(struct tty_struct *tty)
2829 {
2830         if (tty->stopped)
2831                 return 0;
2832         return 32768;           /* No limit, really; we're not buffering */
2833 }
2834
2835 static int con_chars_in_buffer(struct tty_struct *tty)
2836 {
2837         return 0;               /* we're not buffering */
2838 }
2839
2840 /*
2841  * con_throttle and con_unthrottle are only used for
2842  * paste_selection(), which has to stuff in a large number of
2843  * characters...
2844  */
2845 static void con_throttle(struct tty_struct *tty)
2846 {
2847 }
2848
2849 static void con_unthrottle(struct tty_struct *tty)
2850 {
2851         struct vc_data *vc = tty->driver_data;
2852
2853         wake_up_interruptible(&vc->paste_wait);
2854 }
2855
2856 /*
2857  * Turn the Scroll-Lock LED on when the tty is stopped
2858  */
2859 static void con_stop(struct tty_struct *tty)
2860 {
2861         int console_num;
2862         if (!tty)
2863                 return;
2864         console_num = tty->index;
2865         if (!vc_cons_allocated(console_num))
2866                 return;
2867         vt_kbd_con_stop(console_num);
2868 }
2869
2870 /*
2871  * Turn the Scroll-Lock LED off when the console is started
2872  */
2873 static void con_start(struct tty_struct *tty)
2874 {
2875         int console_num;
2876         if (!tty)
2877                 return;
2878         console_num = tty->index;
2879         if (!vc_cons_allocated(console_num))
2880                 return;
2881         vt_kbd_con_start(console_num);
2882 }
2883
2884 static void con_flush_chars(struct tty_struct *tty)
2885 {
2886         struct vc_data *vc;
2887
2888         if (in_interrupt())     /* from flush_to_ldisc */
2889                 return;
2890
2891         /* if we race with con_close(), vt may be null */
2892         console_lock();
2893         vc = tty->driver_data;
2894         if (vc)
2895                 set_cursor(vc);
2896         console_unlock();
2897 }
2898
2899 /*
2900  * Allocate the console screen memory.
2901  */
2902 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2903 {
2904         unsigned int currcons = tty->index;
2905         struct vc_data *vc;
2906         int ret;
2907
2908         console_lock();
2909         ret = vc_allocate(currcons);
2910         if (ret)
2911                 goto unlock;
2912
2913         vc = vc_cons[currcons].d;
2914
2915         /* Still being freed */
2916         if (vc->port.tty) {
2917                 ret = -ERESTARTSYS;
2918                 goto unlock;
2919         }
2920
2921         ret = tty_port_install(&vc->port, driver, tty);
2922         if (ret)
2923                 goto unlock;
2924
2925         tty->driver_data = vc;
2926         vc->port.tty = tty;
2927         tty_port_get(&vc->port);
2928
2929         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2930                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2931                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2932         }
2933         if (vc->vc_utf)
2934                 tty->termios.c_iflag |= IUTF8;
2935         else
2936                 tty->termios.c_iflag &= ~IUTF8;
2937 unlock:
2938         console_unlock();
2939         return ret;
2940 }
2941
2942 static int con_open(struct tty_struct *tty, struct file *filp)
2943 {
2944         /* everything done in install */
2945         return 0;
2946 }
2947
2948
2949 static void con_close(struct tty_struct *tty, struct file *filp)
2950 {
2951         /* Nothing to do - we defer to shutdown */
2952 }
2953
2954 static void con_shutdown(struct tty_struct *tty)
2955 {
2956         struct vc_data *vc = tty->driver_data;
2957         BUG_ON(vc == NULL);
2958         console_lock();
2959         vc->port.tty = NULL;
2960         console_unlock();
2961 }
2962
2963 static void con_cleanup(struct tty_struct *tty)
2964 {
2965         struct vc_data *vc = tty->driver_data;
2966
2967         tty_port_put(&vc->port);
2968 }
2969
2970 static int default_color           = 7; /* white */
2971 static int default_italic_color    = 2; // green (ASCII)
2972 static int default_underline_color = 3; // cyan (ASCII)
2973 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2974 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2975 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2976
2977 static void vc_init(struct vc_data *vc, unsigned int rows,
2978                     unsigned int cols, int do_clear)
2979 {
2980         int j, k ;
2981
2982         vc->vc_cols = cols;
2983         vc->vc_rows = rows;
2984         vc->vc_size_row = cols << 1;
2985         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2986
2987         set_origin(vc);
2988         vc->vc_pos = vc->vc_origin;
2989         reset_vc(vc);
2990         for (j=k=0; j<16; j++) {
2991                 vc->vc_palette[k++] = default_red[j] ;
2992                 vc->vc_palette[k++] = default_grn[j] ;
2993                 vc->vc_palette[k++] = default_blu[j] ;
2994         }
2995         vc->vc_def_color       = default_color;
2996         vc->vc_ulcolor         = default_underline_color;
2997         vc->vc_itcolor         = default_italic_color;
2998         vc->vc_halfcolor       = 0x08;   /* grey */
2999         init_waitqueue_head(&vc->paste_wait);
3000         reset_terminal(vc, do_clear);
3001 }
3002
3003 /*
3004  * This routine initializes console interrupts, and does nothing
3005  * else. If you want the screen to clear, call tty_write with
3006  * the appropriate escape-sequence.
3007  */
3008
3009 static int __init con_init(void)
3010 {
3011         const char *display_desc = NULL;
3012         struct vc_data *vc;
3013         unsigned int currcons = 0, i;
3014
3015         console_lock();
3016
3017         if (conswitchp)
3018                 display_desc = conswitchp->con_startup();
3019         if (!display_desc) {
3020                 fg_console = 0;
3021                 console_unlock();
3022                 return 0;
3023         }
3024
3025         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3026                 struct con_driver *con_driver = &registered_con_driver[i];
3027
3028                 if (con_driver->con == NULL) {
3029                         con_driver->con = conswitchp;
3030                         con_driver->desc = display_desc;
3031                         con_driver->flag = CON_DRIVER_FLAG_INIT;
3032                         con_driver->first = 0;
3033                         con_driver->last = MAX_NR_CONSOLES - 1;
3034                         break;
3035                 }
3036         }
3037
3038         for (i = 0; i < MAX_NR_CONSOLES; i++)
3039                 con_driver_map[i] = conswitchp;
3040
3041         if (blankinterval) {
3042                 blank_state = blank_normal_wait;
3043                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3044         }
3045
3046         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3047                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3048                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3049                 tty_port_init(&vc->port);
3050                 visual_init(vc, currcons, 1);
3051                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3052                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3053                         currcons || !vc->vc_sw->con_save_screen);
3054         }
3055         currcons = fg_console = 0;
3056         master_display_fg = vc = vc_cons[currcons].d;
3057         set_origin(vc);
3058         save_screen(vc);
3059         gotoxy(vc, vc->vc_x, vc->vc_y);
3060         csi_J(vc, 0);
3061         update_screen(vc);
3062         pr_info("Console: %s %s %dx%d\n",
3063                 vc->vc_can_do_color ? "colour" : "mono",
3064                 display_desc, vc->vc_cols, vc->vc_rows);
3065         printable = 1;
3066
3067         console_unlock();
3068
3069 #ifdef CONFIG_VT_CONSOLE
3070         register_console(&vt_console_driver);
3071 #endif
3072         return 0;
3073 }
3074 console_initcall(con_init);
3075
3076 static const struct tty_operations con_ops = {
3077         .install = con_install,
3078         .open = con_open,
3079         .close = con_close,
3080         .write = con_write,
3081         .write_room = con_write_room,
3082         .put_char = con_put_char,
3083         .flush_chars = con_flush_chars,
3084         .chars_in_buffer = con_chars_in_buffer,
3085         .ioctl = vt_ioctl,
3086 #ifdef CONFIG_COMPAT
3087         .compat_ioctl = vt_compat_ioctl,
3088 #endif
3089         .stop = con_stop,
3090         .start = con_start,
3091         .throttle = con_throttle,
3092         .unthrottle = con_unthrottle,
3093         .resize = vt_resize,
3094         .shutdown = con_shutdown,
3095         .cleanup = con_cleanup,
3096 };
3097
3098 static struct cdev vc0_cdev;
3099
3100 static ssize_t show_tty_active(struct device *dev,
3101                                 struct device_attribute *attr, char *buf)
3102 {
3103         return sprintf(buf, "tty%d\n", fg_console + 1);
3104 }
3105 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3106
3107 static struct attribute *vt_dev_attrs[] = {
3108         &dev_attr_active.attr,
3109         NULL
3110 };
3111
3112 ATTRIBUTE_GROUPS(vt_dev);
3113
3114 int __init vty_init(const struct file_operations *console_fops)
3115 {
3116         cdev_init(&vc0_cdev, console_fops);
3117         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3118             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3119                 panic("Couldn't register /dev/tty0 driver\n");
3120         tty0dev = device_create_with_groups(tty_class, NULL,
3121                                             MKDEV(TTY_MAJOR, 0), NULL,
3122                                             vt_dev_groups, "tty0");
3123         if (IS_ERR(tty0dev))
3124                 tty0dev = NULL;
3125
3126         vcs_init();
3127
3128         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3129         if (!console_driver)
3130                 panic("Couldn't allocate console driver\n");
3131
3132         console_driver->name = "tty";
3133         console_driver->name_base = 1;
3134         console_driver->major = TTY_MAJOR;
3135         console_driver->minor_start = 1;
3136         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3137         console_driver->init_termios = tty_std_termios;
3138         if (default_utf8)
3139                 console_driver->init_termios.c_iflag |= IUTF8;
3140         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3141         tty_set_operations(console_driver, &con_ops);
3142         if (tty_register_driver(console_driver))
3143                 panic("Couldn't register console driver\n");
3144         kbd_init();
3145         console_map_init();
3146 #ifdef CONFIG_MDA_CONSOLE
3147         mda_console_init();
3148 #endif
3149         return 0;
3150 }
3151
3152 #ifndef VT_SINGLE_DRIVER
3153
3154 static struct class *vtconsole_class;
3155
3156 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3157                            int deflt)
3158 {
3159         struct module *owner = csw->owner;
3160         const char *desc = NULL;
3161         struct con_driver *con_driver;
3162         int i, j = -1, k = -1, retval = -ENODEV;
3163
3164         if (!try_module_get(owner))
3165                 return -ENODEV;
3166
3167         WARN_CONSOLE_UNLOCKED();
3168
3169         /* check if driver is registered */
3170         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3171                 con_driver = &registered_con_driver[i];
3172
3173                 if (con_driver->con == csw) {
3174                         desc = con_driver->desc;
3175                         retval = 0;
3176                         break;
3177                 }
3178         }
3179
3180         if (retval)
3181                 goto err;
3182
3183         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3184                 csw->con_startup();
3185                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3186         }
3187
3188         if (deflt) {
3189                 if (conswitchp)
3190                         module_put(conswitchp->owner);
3191
3192                 __module_get(owner);
3193                 conswitchp = csw;
3194         }
3195
3196         first = max(first, con_driver->first);
3197         last = min(last, con_driver->last);
3198
3199         for (i = first; i <= last; i++) {
3200                 int old_was_color;
3201                 struct vc_data *vc = vc_cons[i].d;
3202
3203                 if (con_driver_map[i])
3204                         module_put(con_driver_map[i]->owner);
3205                 __module_get(owner);
3206                 con_driver_map[i] = csw;
3207
3208                 if (!vc || !vc->vc_sw)
3209                         continue;
3210
3211                 j = i;
3212
3213                 if (CON_IS_VISIBLE(vc)) {
3214                         k = i;
3215                         save_screen(vc);
3216                 }
3217
3218                 old_was_color = vc->vc_can_do_color;
3219                 vc->vc_sw->con_deinit(vc);
3220                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3221                 visual_init(vc, i, 0);
3222                 set_origin(vc);
3223                 update_attr(vc);
3224
3225                 /* If the console changed between mono <-> color, then
3226                  * the attributes in the screenbuf will be wrong.  The
3227                  * following resets all attributes to something sane.
3228                  */
3229                 if (old_was_color != vc->vc_can_do_color)
3230                         clear_buffer_attributes(vc);
3231         }
3232
3233         pr_info("Console: switching ");
3234         if (!deflt)
3235                 printk("consoles %d-%d ", first+1, last+1);
3236         if (j >= 0) {
3237                 struct vc_data *vc = vc_cons[j].d;
3238
3239                 printk("to %s %s %dx%d\n",
3240                        vc->vc_can_do_color ? "colour" : "mono",
3241                        desc, vc->vc_cols, vc->vc_rows);
3242
3243                 if (k >= 0) {
3244                         vc = vc_cons[k].d;
3245                         update_screen(vc);
3246                 }
3247         } else
3248                 printk("to %s\n", desc);
3249
3250         retval = 0;
3251 err:
3252         module_put(owner);
3253         return retval;
3254 };
3255
3256
3257 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3258 /* unlocked version of unbind_con_driver() */
3259 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3260 {
3261         struct module *owner = csw->owner;
3262         const struct consw *defcsw = NULL;
3263         struct con_driver *con_driver = NULL, *con_back = NULL;
3264         int i, retval = -ENODEV;
3265
3266         if (!try_module_get(owner))
3267                 return -ENODEV;
3268
3269         WARN_CONSOLE_UNLOCKED();
3270
3271         /* check if driver is registered and if it is unbindable */
3272         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3273                 con_driver = &registered_con_driver[i];
3274
3275                 if (con_driver->con == csw &&
3276                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3277                         retval = 0;
3278                         break;
3279                 }
3280         }
3281
3282         if (retval)
3283                 goto err;
3284
3285         retval = -ENODEV;
3286
3287         /* check if backup driver exists */
3288         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3289                 con_back = &registered_con_driver[i];
3290
3291                 if (con_back->con && con_back->con != csw) {
3292                         defcsw = con_back->con;
3293                         retval = 0;
3294                         break;
3295                 }
3296         }
3297
3298         if (retval)
3299                 goto err;
3300
3301         if (!con_is_bound(csw))
3302                 goto err;
3303
3304         first = max(first, con_driver->first);
3305         last = min(last, con_driver->last);
3306
3307         for (i = first; i <= last; i++) {
3308                 if (con_driver_map[i] == csw) {
3309                         module_put(csw->owner);
3310                         con_driver_map[i] = NULL;
3311                 }
3312         }
3313
3314         if (!con_is_bound(defcsw)) {
3315                 const struct consw *defconsw = conswitchp;
3316
3317                 defcsw->con_startup();
3318                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3319                 /*
3320                  * vgacon may change the default driver to point
3321                  * to dummycon, we restore it here...
3322                  */
3323                 conswitchp = defconsw;
3324         }
3325
3326         if (!con_is_bound(csw))
3327                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3328
3329         /* ignore return value, binding should not fail */
3330         do_bind_con_driver(defcsw, first, last, deflt);
3331 err:
3332         module_put(owner);
3333         return retval;
3334
3335 }
3336 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3337
3338 static int vt_bind(struct con_driver *con)
3339 {
3340         const struct consw *defcsw = NULL, *csw = NULL;
3341         int i, more = 1, first = -1, last = -1, deflt = 0;
3342
3343         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3344                 goto err;
3345
3346         csw = con->con;
3347
3348         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3349                 struct con_driver *con = &registered_con_driver[i];
3350
3351                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3352                         defcsw = con->con;
3353                         break;
3354                 }
3355         }
3356
3357         if (!defcsw)
3358                 goto err;
3359
3360         while (more) {
3361                 more = 0;
3362
3363                 for (i = con->first; i <= con->last; i++) {
3364                         if (con_driver_map[i] == defcsw) {
3365                                 if (first == -1)
3366                                         first = i;
3367                                 last = i;
3368                                 more = 1;
3369                         } else if (first != -1)
3370                                 break;
3371                 }
3372
3373                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3374                         deflt = 1;
3375
3376                 if (first != -1)
3377                         do_bind_con_driver(csw, first, last, deflt);
3378
3379                 first = -1;
3380                 last = -1;
3381                 deflt = 0;
3382         }
3383
3384 err:
3385         return 0;
3386 }
3387
3388 static int vt_unbind(struct con_driver *con)
3389 {
3390         const struct consw *csw = NULL;
3391         int i, more = 1, first = -1, last = -1, deflt = 0;
3392         int ret;
3393
3394         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3395                 goto err;
3396
3397         csw = con->con;
3398
3399         while (more) {
3400                 more = 0;
3401
3402                 for (i = con->first; i <= con->last; i++) {
3403                         if (con_driver_map[i] == csw) {
3404                                 if (first == -1)
3405                                         first = i;
3406                                 last = i;
3407                                 more = 1;
3408                         } else if (first != -1)
3409                                 break;
3410                 }
3411
3412                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3413                         deflt = 1;
3414
3415                 if (first != -1) {
3416                         ret = do_unbind_con_driver(csw, first, last, deflt);
3417                         if (ret != 0)
3418                                 return ret;
3419                 }
3420
3421                 first = -1;
3422                 last = -1;
3423                 deflt = 0;
3424         }
3425
3426 err:
3427         return 0;
3428 }
3429 #else
3430 static inline int vt_bind(struct con_driver *con)
3431 {
3432         return 0;
3433 }
3434 static inline int vt_unbind(struct con_driver *con)
3435 {
3436         return 0;
3437 }
3438 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3439
3440 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3441                           const char *buf, size_t count)
3442 {
3443         struct con_driver *con = dev_get_drvdata(dev);
3444         int bind = simple_strtoul(buf, NULL, 0);
3445
3446         console_lock();
3447
3448         if (bind)
3449                 vt_bind(con);
3450         else
3451                 vt_unbind(con);
3452
3453         console_unlock();
3454
3455         return count;
3456 }
3457
3458 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3459                          char *buf)
3460 {
3461         struct con_driver *con = dev_get_drvdata(dev);
3462         int bind = con_is_bound(con->con);
3463
3464         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3465 }
3466
3467 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3468                          char *buf)
3469 {
3470         struct con_driver *con = dev_get_drvdata(dev);
3471
3472         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3473                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3474                          con->desc);
3475
3476 }
3477
3478 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3479 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3480
3481 static struct attribute *con_dev_attrs[] = {
3482         &dev_attr_bind.attr,
3483         &dev_attr_name.attr,
3484         NULL
3485 };
3486
3487 ATTRIBUTE_GROUPS(con_dev);
3488
3489 static int vtconsole_init_device(struct con_driver *con)
3490 {
3491         con->flag |= CON_DRIVER_FLAG_ATTR;
3492         return 0;
3493 }
3494
3495 static void vtconsole_deinit_device(struct con_driver *con)
3496 {
3497         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3498 }
3499
3500 /**
3501  * con_is_bound - checks if driver is bound to the console
3502  * @csw: console driver
3503  *
3504  * RETURNS: zero if unbound, nonzero if bound
3505  *
3506  * Drivers can call this and if zero, they should release
3507  * all resources allocated on con_startup()
3508  */
3509 int con_is_bound(const struct consw *csw)
3510 {
3511         int i, bound = 0;
3512
3513         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3514                 if (con_driver_map[i] == csw) {
3515                         bound = 1;
3516                         break;
3517                 }
3518         }
3519
3520         return bound;
3521 }
3522 EXPORT_SYMBOL(con_is_bound);
3523
3524 /**
3525  * con_debug_enter - prepare the console for the kernel debugger
3526  * @sw: console driver
3527  *
3528  * Called when the console is taken over by the kernel debugger, this
3529  * function needs to save the current console state, then put the console
3530  * into a state suitable for the kernel debugger.
3531  *
3532  * RETURNS:
3533  * Zero on success, nonzero if a failure occurred when trying to prepare
3534  * the console for the debugger.
3535  */
3536 int con_debug_enter(struct vc_data *vc)
3537 {
3538         int ret = 0;
3539
3540         saved_fg_console = fg_console;
3541         saved_last_console = last_console;
3542         saved_want_console = want_console;
3543         saved_vc_mode = vc->vc_mode;
3544         saved_console_blanked = console_blanked;
3545         vc->vc_mode = KD_TEXT;
3546         console_blanked = 0;
3547         if (vc->vc_sw->con_debug_enter)
3548                 ret = vc->vc_sw->con_debug_enter(vc);
3549 #ifdef CONFIG_KGDB_KDB
3550         /* Set the initial LINES variable if it is not already set */
3551         if (vc->vc_rows < 999) {
3552                 int linecount;
3553                 char lns[4];
3554                 const char *setargs[3] = {
3555                         "set",
3556                         "LINES",
3557                         lns,
3558                 };
3559                 if (kdbgetintenv(setargs[0], &linecount)) {
3560                         snprintf(lns, 4, "%i", vc->vc_rows);
3561                         kdb_set(2, setargs);
3562                 }
3563         }
3564         if (vc->vc_cols < 999) {
3565                 int colcount;
3566                 char cols[4];
3567                 const char *setargs[3] = {
3568                         "set",
3569                         "COLUMNS",
3570                         cols,
3571                 };
3572                 if (kdbgetintenv(setargs[0], &colcount)) {
3573                         snprintf(cols, 4, "%i", vc->vc_cols);
3574                         kdb_set(2, setargs);
3575                 }
3576         }
3577 #endif /* CONFIG_KGDB_KDB */
3578         return ret;
3579 }
3580 EXPORT_SYMBOL_GPL(con_debug_enter);
3581
3582 /**
3583  * con_debug_leave - restore console state
3584  * @sw: console driver
3585  *
3586  * Restore the console state to what it was before the kernel debugger
3587  * was invoked.
3588  *
3589  * RETURNS:
3590  * Zero on success, nonzero if a failure occurred when trying to restore
3591  * the console.
3592  */
3593 int con_debug_leave(void)
3594 {
3595         struct vc_data *vc;
3596         int ret = 0;
3597
3598         fg_console = saved_fg_console;
3599         last_console = saved_last_console;
3600         want_console = saved_want_console;
3601         console_blanked = saved_console_blanked;
3602         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3603
3604         vc = vc_cons[fg_console].d;
3605         if (vc->vc_sw->con_debug_leave)
3606                 ret = vc->vc_sw->con_debug_leave(vc);
3607         return ret;
3608 }
3609 EXPORT_SYMBOL_GPL(con_debug_leave);
3610
3611 static int do_register_con_driver(const struct consw *csw, int first, int last)
3612 {
3613         struct module *owner = csw->owner;
3614         struct con_driver *con_driver;
3615         const char *desc;
3616         int i, retval = 0;
3617
3618         WARN_CONSOLE_UNLOCKED();
3619
3620         if (!try_module_get(owner))
3621                 return -ENODEV;
3622
3623         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3624                 con_driver = &registered_con_driver[i];
3625
3626                 /* already registered */
3627                 if (con_driver->con == csw)
3628                         retval = -EBUSY;
3629         }
3630
3631         if (retval)
3632                 goto err;
3633
3634         desc = csw->con_startup();
3635         if (!desc) {
3636                 retval = -ENODEV;
3637                 goto err;
3638         }
3639
3640         retval = -EINVAL;
3641
3642         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3643                 con_driver = &registered_con_driver[i];
3644
3645                 if (con_driver->con == NULL &&
3646                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3647                         con_driver->con = csw;
3648                         con_driver->desc = desc;
3649                         con_driver->node = i;
3650                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3651                                            CON_DRIVER_FLAG_INIT;
3652                         con_driver->first = first;
3653                         con_driver->last = last;
3654                         retval = 0;
3655                         break;
3656                 }
3657         }
3658
3659         if (retval)
3660                 goto err;
3661
3662         con_driver->dev =
3663                 device_create_with_groups(vtconsole_class, NULL,
3664                                           MKDEV(0, con_driver->node),
3665                                           con_driver, con_dev_groups,
3666                                           "vtcon%i", con_driver->node);
3667         if (IS_ERR(con_driver->dev)) {
3668                 printk(KERN_WARNING "Unable to create device for %s; "
3669                        "errno = %ld\n", con_driver->desc,
3670                        PTR_ERR(con_driver->dev));
3671                 con_driver->dev = NULL;
3672         } else {
3673                 vtconsole_init_device(con_driver);
3674         }
3675
3676 err:
3677         module_put(owner);
3678         return retval;
3679 }
3680
3681
3682 /**
3683  * do_unregister_con_driver - unregister console driver from console layer
3684  * @csw: console driver
3685  *
3686  * DESCRIPTION: All drivers that registers to the console layer must
3687  * call this function upon exit, or if the console driver is in a state
3688  * where it won't be able to handle console services, such as the
3689  * framebuffer console without loaded framebuffer drivers.
3690  *
3691  * The driver must unbind first prior to unregistration.
3692  */
3693 int do_unregister_con_driver(const struct consw *csw)
3694 {
3695         int i;
3696
3697         /* cannot unregister a bound driver */
3698         if (con_is_bound(csw))
3699                 return -EBUSY;
3700
3701         if (csw == conswitchp)
3702                 return -EINVAL;
3703
3704         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3705                 struct con_driver *con_driver = &registered_con_driver[i];
3706
3707                 if (con_driver->con == csw) {
3708                         /*
3709                          * Defer the removal of the sysfs entries since that
3710                          * will acquire the kernfs s_active lock and we can't
3711                          * acquire this lock while holding the console lock:
3712                          * the unbind sysfs entry imposes already the opposite
3713                          * order. Reset con already here to prevent any later
3714                          * lookup to succeed and mark this slot as zombie, so
3715                          * it won't get reused until we complete the removal
3716                          * in the deferred work.
3717                          */
3718                         con_driver->con = NULL;
3719                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3720                         schedule_work(&con_driver_unregister_work);
3721
3722                         return 0;
3723                 }
3724         }
3725
3726         return -ENODEV;
3727 }
3728 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3729
3730 static void con_driver_unregister_callback(struct work_struct *ignored)
3731 {
3732         int i;
3733
3734         console_lock();
3735
3736         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3737                 struct con_driver *con_driver = &registered_con_driver[i];
3738
3739                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3740                         continue;
3741
3742                 console_unlock();
3743
3744                 vtconsole_deinit_device(con_driver);
3745                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3746
3747                 console_lock();
3748
3749                 if (WARN_ON_ONCE(con_driver->con))
3750                         con_driver->con = NULL;
3751                 con_driver->desc = NULL;
3752                 con_driver->dev = NULL;
3753                 con_driver->node = 0;
3754                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3755                 con_driver->flag = 0;
3756                 con_driver->first = 0;
3757                 con_driver->last = 0;
3758         }
3759
3760         console_unlock();
3761 }
3762
3763 /*
3764  *      If we support more console drivers, this function is used
3765  *      when a driver wants to take over some existing consoles
3766  *      and become default driver for newly opened ones.
3767  *
3768  *      do_take_over_console is basically a register followed by unbind
3769  */
3770 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3771 {
3772         int err;
3773
3774         err = do_register_con_driver(csw, first, last);
3775         /*
3776          * If we get an busy error we still want to bind the console driver
3777          * and return success, as we may have unbound the console driver
3778          * but not unregistered it.
3779          */
3780         if (err == -EBUSY)
3781                 err = 0;
3782         if (!err)
3783                 do_bind_con_driver(csw, first, last, deflt);
3784
3785         return err;
3786 }
3787 EXPORT_SYMBOL_GPL(do_take_over_console);
3788
3789
3790 /*
3791  * give_up_console is a wrapper to unregister_con_driver. It will only
3792  * work if driver is fully unbound.
3793  */
3794 void give_up_console(const struct consw *csw)
3795 {
3796         console_lock();
3797         do_unregister_con_driver(csw);
3798         console_unlock();
3799 }
3800
3801 static int __init vtconsole_class_init(void)
3802 {
3803         int i;
3804
3805         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3806         if (IS_ERR(vtconsole_class)) {
3807                 printk(KERN_WARNING "Unable to create vt console class; "
3808                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3809                 vtconsole_class = NULL;
3810         }
3811
3812         /* Add system drivers to sysfs */
3813         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3814                 struct con_driver *con = &registered_con_driver[i];
3815
3816                 if (con->con && !con->dev) {
3817                         con->dev =
3818                                 device_create_with_groups(vtconsole_class, NULL,
3819                                                           MKDEV(0, con->node),
3820                                                           con, con_dev_groups,
3821                                                           "vtcon%i", con->node);
3822
3823                         if (IS_ERR(con->dev)) {
3824                                 printk(KERN_WARNING "Unable to create "
3825                                        "device for %s; errno = %ld\n",
3826                                        con->desc, PTR_ERR(con->dev));
3827                                 con->dev = NULL;
3828                         } else {
3829                                 vtconsole_init_device(con);
3830                         }
3831                 }
3832         }
3833
3834         return 0;
3835 }
3836 postcore_initcall(vtconsole_class_init);
3837
3838 #endif
3839
3840 /*
3841  *      Screen blanking
3842  */
3843
3844 static int set_vesa_blanking(char __user *p)
3845 {
3846         unsigned int mode;
3847
3848         if (get_user(mode, p + 1))
3849                 return -EFAULT;
3850
3851         vesa_blank_mode = (mode < 4) ? mode : 0;
3852         return 0;
3853 }
3854
3855 void do_blank_screen(int entering_gfx)
3856 {
3857         struct vc_data *vc = vc_cons[fg_console].d;
3858         int i;
3859
3860         WARN_CONSOLE_UNLOCKED();
3861
3862         if (console_blanked) {
3863                 if (blank_state == blank_vesa_wait) {
3864                         blank_state = blank_off;
3865                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3866                 }
3867                 return;
3868         }
3869
3870         /* entering graphics mode? */
3871         if (entering_gfx) {
3872                 hide_cursor(vc);
3873                 save_screen(vc);
3874                 vc->vc_sw->con_blank(vc, -1, 1);
3875                 console_blanked = fg_console + 1;
3876                 blank_state = blank_off;
3877                 set_origin(vc);
3878                 return;
3879         }
3880
3881         if (blank_state != blank_normal_wait)
3882                 return;
3883         blank_state = blank_off;
3884
3885         /* don't blank graphics */
3886         if (vc->vc_mode != KD_TEXT) {
3887                 console_blanked = fg_console + 1;
3888                 return;
3889         }
3890
3891         hide_cursor(vc);
3892         del_timer_sync(&console_timer);
3893         blank_timer_expired = 0;
3894
3895         save_screen(vc);
3896         /* In case we need to reset origin, blanking hook returns 1 */
3897         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3898         console_blanked = fg_console + 1;
3899         if (i)
3900                 set_origin(vc);
3901
3902         if (console_blank_hook && console_blank_hook(1))
3903                 return;
3904
3905         if (vesa_off_interval && vesa_blank_mode) {
3906                 blank_state = blank_vesa_wait;
3907                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3908         }
3909         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3910 }
3911 EXPORT_SYMBOL(do_blank_screen);
3912
3913 /*
3914  * Called by timer as well as from vt_console_driver
3915  */
3916 void do_unblank_screen(int leaving_gfx)
3917 {
3918         struct vc_data *vc;
3919
3920         /* This should now always be called from a "sane" (read: can schedule)
3921          * context for the sake of the low level drivers, except in the special
3922          * case of oops_in_progress
3923          */
3924         if (!oops_in_progress)
3925                 might_sleep();
3926
3927         WARN_CONSOLE_UNLOCKED();
3928
3929         ignore_poke = 0;
3930         if (!console_blanked)
3931                 return;
3932         if (!vc_cons_allocated(fg_console)) {
3933                 /* impossible */
3934                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3935                         fg_console + 1);
3936                 return;
3937         }
3938         vc = vc_cons[fg_console].d;
3939         /* Try to unblank in oops case too */
3940         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3941                 return; /* but leave console_blanked != 0 */
3942
3943         if (blankinterval) {
3944                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3945                 blank_state = blank_normal_wait;
3946         }
3947
3948         console_blanked = 0;
3949         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3950                 /* Low-level driver cannot restore -> do it ourselves */
3951                 update_screen(vc);
3952         if (console_blank_hook)
3953                 console_blank_hook(0);
3954         set_palette(vc);
3955         set_cursor(vc);
3956         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3957 }
3958 EXPORT_SYMBOL(do_unblank_screen);
3959
3960 /*
3961  * This is called by the outside world to cause a forced unblank, mostly for
3962  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3963  * call it with 1 as an argument and so force a mode restore... that may kill
3964  * X or at least garbage the screen but would also make the Oops visible...
3965  */
3966 void unblank_screen(void)
3967 {
3968         do_unblank_screen(0);
3969 }
3970
3971 /*
3972  * We defer the timer blanking to work queue so it can take the console mutex
3973  * (console operations can still happen at irq time, but only from printk which
3974  * has the console mutex. Not perfect yet, but better than no locking
3975  */
3976 static void blank_screen_t(unsigned long dummy)
3977 {
3978         if (unlikely(!keventd_up())) {
3979                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3980                 return;
3981         }
3982         blank_timer_expired = 1;
3983         schedule_work(&console_work);
3984 }
3985
3986 void poke_blanked_console(void)
3987 {
3988         WARN_CONSOLE_UNLOCKED();
3989
3990         /* Add this so we quickly catch whoever might call us in a non
3991          * safe context. Nowadays, unblank_screen() isn't to be called in
3992          * atomic contexts and is allowed to schedule (with the special case
3993          * of oops_in_progress, but that isn't of any concern for this
3994          * function. --BenH.
3995          */
3996         might_sleep();
3997
3998         /* This isn't perfectly race free, but a race here would be mostly harmless,
3999          * at worse, we'll do a spurrious blank and it's unlikely
4000          */
4001         del_timer(&console_timer);
4002         blank_timer_expired = 0;
4003
4004         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4005                 return;
4006         if (console_blanked)
4007                 unblank_screen();
4008         else if (blankinterval) {
4009                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4010                 blank_state = blank_normal_wait;
4011         }
4012 }
4013
4014 /*
4015  *      Palettes
4016  */
4017
4018 static void set_palette(struct vc_data *vc)
4019 {
4020         WARN_CONSOLE_UNLOCKED();
4021
4022         if (vc->vc_mode != KD_GRAPHICS)
4023                 vc->vc_sw->con_set_palette(vc, color_table);
4024 }
4025
4026 /*
4027  * Load palette into the DAC registers. arg points to a colour
4028  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4029  */
4030
4031 int con_set_cmap(unsigned char __user *arg)
4032 {
4033         int i, j, k;
4034         unsigned char colormap[3*16];
4035
4036         if (copy_from_user(colormap, arg, sizeof(colormap)))
4037                 return -EFAULT;
4038
4039         console_lock();
4040         for (i = k = 0; i < 16; i++) {
4041                 default_red[i] = colormap[k++];
4042                 default_grn[i] = colormap[k++];
4043                 default_blu[i] = colormap[k++];
4044         }
4045         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4046                 if (!vc_cons_allocated(i))
4047                         continue;
4048                 for (j = k = 0; j < 16; j++) {
4049                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4050                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4051                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4052                 }
4053                 set_palette(vc_cons[i].d);
4054         }
4055         console_unlock();
4056
4057         return 0;
4058 }
4059
4060 int con_get_cmap(unsigned char __user *arg)
4061 {
4062         int i, k;
4063         unsigned char colormap[3*16];
4064
4065         console_lock();
4066         for (i = k = 0; i < 16; i++) {
4067                 colormap[k++] = default_red[i];
4068                 colormap[k++] = default_grn[i];
4069                 colormap[k++] = default_blu[i];
4070         }
4071         console_unlock();
4072
4073         if (copy_to_user(arg, colormap, sizeof(colormap)))
4074                 return -EFAULT;
4075
4076         return 0;
4077 }
4078
4079 void reset_palette(struct vc_data *vc)
4080 {
4081         int j, k;
4082         for (j=k=0; j<16; j++) {
4083                 vc->vc_palette[k++] = default_red[j];
4084                 vc->vc_palette[k++] = default_grn[j];
4085                 vc->vc_palette[k++] = default_blu[j];
4086         }
4087         set_palette(vc);
4088 }
4089
4090 /*
4091  *  Font switching
4092  *
4093  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4094  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4095  *  depending on width) reserved for each character which is kinda wasty, but
4096  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4097  *  is up to the actual low-level console-driver convert data into its favorite
4098  *  format (maybe we should add a `fontoffset' field to the `display'
4099  *  structure so we won't have to convert the fontdata all the time.
4100  *  /Jes
4101  */
4102
4103 #define max_font_size 65536
4104
4105 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4106 {
4107         struct console_font font;
4108         int rc = -EINVAL;
4109         int c;
4110
4111         if (op->data) {
4112                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4113                 if (!font.data)
4114                         return -ENOMEM;
4115         } else
4116                 font.data = NULL;
4117
4118         console_lock();
4119         if (vc->vc_mode != KD_TEXT)
4120                 rc = -EINVAL;
4121         else if (vc->vc_sw->con_font_get)
4122                 rc = vc->vc_sw->con_font_get(vc, &font);
4123         else
4124                 rc = -ENOSYS;
4125         console_unlock();
4126
4127         if (rc)
4128                 goto out;
4129
4130         c = (font.width+7)/8 * 32 * font.charcount;
4131
4132         if (op->data && font.charcount > op->charcount)
4133                 rc = -ENOSPC;
4134         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4135                 if (font.width > op->width || font.height > op->height)
4136                         rc = -ENOSPC;
4137         } else {
4138                 if (font.width != 8)
4139                         rc = -EIO;
4140                 else if ((op->height && font.height > op->height) ||
4141                          font.height > 32)
4142                         rc = -ENOSPC;
4143         }
4144         if (rc)
4145                 goto out;
4146
4147         op->height = font.height;
4148         op->width = font.width;
4149         op->charcount = font.charcount;
4150
4151         if (op->data && copy_to_user(op->data, font.data, c))
4152                 rc = -EFAULT;
4153
4154 out:
4155         kfree(font.data);
4156         return rc;
4157 }
4158
4159 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4160 {
4161         struct console_font font;
4162         int rc = -EINVAL;
4163         int size;
4164
4165         if (vc->vc_mode != KD_TEXT)
4166                 return -EINVAL;
4167         if (!op->data)
4168                 return -EINVAL;
4169         if (op->charcount > 512)
4170                 return -EINVAL;
4171         if (!op->height) {              /* Need to guess font height [compat] */
4172                 int h, i;
4173                 u8 __user *charmap = op->data;
4174                 u8 tmp;
4175
4176                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4177                    so that we can get rid of this soon */
4178                 if (!(op->flags & KD_FONT_FLAG_OLD))
4179                         return -EINVAL;
4180                 for (h = 32; h > 0; h--)
4181                         for (i = 0; i < op->charcount; i++) {
4182                                 if (get_user(tmp, &charmap[32*i+h-1]))
4183                                         return -EFAULT;
4184                                 if (tmp)
4185                                         goto nonzero;
4186                         }
4187                 return -EINVAL;
4188         nonzero:
4189                 op->height = h;
4190         }
4191         if (op->width <= 0 || op->width > 32 || op->height > 32)
4192                 return -EINVAL;
4193         size = (op->width+7)/8 * 32 * op->charcount;
4194         if (size > max_font_size)
4195                 return -ENOSPC;
4196         font.charcount = op->charcount;
4197         font.height = op->height;
4198         font.width = op->width;
4199         font.data = memdup_user(op->data, size);
4200         if (IS_ERR(font.data))
4201                 return PTR_ERR(font.data);
4202         console_lock();
4203         if (vc->vc_mode != KD_TEXT)
4204                 rc = -EINVAL;
4205         else if (vc->vc_sw->con_font_set)
4206                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4207         else
4208                 rc = -ENOSYS;
4209         console_unlock();
4210         kfree(font.data);
4211         return rc;
4212 }
4213
4214 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4215 {
4216         struct console_font font = {.width = op->width, .height = op->height};
4217         char name[MAX_FONT_NAME];
4218         char *s = name;
4219         int rc;
4220
4221
4222         if (!op->data)
4223                 s = NULL;
4224         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4225                 return -EFAULT;
4226         else
4227                 name[MAX_FONT_NAME - 1] = 0;
4228
4229         console_lock();
4230         if (vc->vc_mode != KD_TEXT) {
4231                 console_unlock();
4232                 return -EINVAL;
4233         }
4234         if (vc->vc_sw->con_font_default)
4235                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4236         else
4237                 rc = -ENOSYS;
4238         console_unlock();
4239         if (!rc) {
4240                 op->width = font.width;
4241                 op->height = font.height;
4242         }
4243         return rc;
4244 }
4245
4246 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4247 {
4248         switch (op->op) {
4249         case KD_FONT_OP_SET:
4250                 return con_font_set(vc, op);
4251         case KD_FONT_OP_GET:
4252                 return con_font_get(vc, op);
4253         case KD_FONT_OP_SET_DEFAULT:
4254                 return con_font_default(vc, op);
4255         case KD_FONT_OP_COPY:
4256                 /* was buggy and never really used */
4257                 return -EINVAL;
4258         }
4259         return -ENOSYS;
4260 }
4261
4262 /*
4263  *      Interface exported to selection and vcs.
4264  */
4265
4266 /* used by selection */
4267 u16 screen_glyph(struct vc_data *vc, int offset)
4268 {
4269         u16 w = scr_readw(screenpos(vc, offset, 1));
4270         u16 c = w & 0xff;
4271
4272         if (w & vc->vc_hi_font_mask)
4273                 c |= 0x100;
4274         return c;
4275 }
4276 EXPORT_SYMBOL_GPL(screen_glyph);
4277
4278 /* used by vcs - note the word offset */
4279 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4280 {
4281         return screenpos(vc, 2 * w_offset, viewed);
4282 }
4283
4284 void getconsxy(struct vc_data *vc, unsigned char *p)
4285 {
4286         p[0] = vc->vc_x;
4287         p[1] = vc->vc_y;
4288 }
4289
4290 void putconsxy(struct vc_data *vc, unsigned char *p)
4291 {
4292         hide_cursor(vc);
4293         gotoxy(vc, p[0], p[1]);
4294         set_cursor(vc);
4295 }
4296
4297 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4298 {
4299         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4300                 return softcursor_original;
4301         return scr_readw(org);
4302 }
4303
4304 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4305 {
4306         scr_writew(val, org);
4307         if ((unsigned long)org == vc->vc_pos) {
4308                 softcursor_original = -1;
4309                 add_softcursor(vc);
4310         }
4311 }
4312
4313 void vcs_scr_updated(struct vc_data *vc)
4314 {
4315         notify_update(vc);
4316 }
4317
4318 /*
4319  *      Visible symbols for modules
4320  */
4321
4322 EXPORT_SYMBOL(color_table);
4323 EXPORT_SYMBOL(default_red);
4324 EXPORT_SYMBOL(default_grn);
4325 EXPORT_SYMBOL(default_blu);
4326 EXPORT_SYMBOL(update_region);
4327 EXPORT_SYMBOL(redraw_screen);
4328 EXPORT_SYMBOL(vc_resize);
4329 EXPORT_SYMBOL(fg_console);
4330 EXPORT_SYMBOL(console_blank_hook);
4331 EXPORT_SYMBOL(console_blanked);
4332 EXPORT_SYMBOL(vc_cons);
4333 EXPORT_SYMBOL(global_cursor_default);
4334 #ifndef VT_SINGLE_DRIVER
4335 EXPORT_SYMBOL(give_up_console);
4336 #endif