drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <g-hunt@ee.utah.edu>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21  *
  22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <poe@daimi.aau.dk>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <geert@linux-m68k.org>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <arno@usn.nl>
  39  *     - David Carter <carter@cs.bris.ac.uk>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111 #define CON_DRIVER_FLAG_ZOMBIE 8
 112
 113 struct con_driver {
 114         const struct consw *con;
 115         const char *desc;
 116         struct device *dev;
 117         int node;
 118         int first;
 119         int last;
 120         int flag;
 121 };
 122
 123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 124 const struct consw *conswitchp;
 125
 126 /* A bitmap for codes <32. A bit of 1 indicates that the code
 127  * corresponding to that bit number invokes some special action
 128  * (such as cursor movement) and should not be displayed as a
 129  * glyph unless the disp_ctrl mode is explicitly enabled.
 130  */
 131 #define CTRL_ACTION 0x0d00ff81
 132 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 133
 134 /*
 135  * Here is the default bell parameters: 750HZ, 1/8th of a second
 136  */
 137 #define DEFAULT_BELL_PITCH      750
 138 #define DEFAULT_BELL_DURATION   (HZ/8)
 139 #define DEFAULT_CURSOR_BLINK_MS 200
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void con_driver_unregister_callback(struct work_struct *ignored);
 159 static void blank_screen_t(unsigned long dummy);
 160 static void set_palette(struct vc_data *vc);
 161
 162 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 163
 164 static int printable;           /* Is console ready for printing? */
 165 int default_utf8 = true;
 166 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 167 int global_cursor_default = -1;
 168 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 169
 170 static int cur_default = CUR_DEFAULT;
 171 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 172
 173 /*
 174  * ignore_poke: don't unblank the screen when things are typed.  This is
 175  * mainly for the privacy of braille terminal users.
 176  */
 177 static int ignore_poke;
 178
 179 int do_poke_blanked_console;
 180 int console_blanked;
 181
 182 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 183 static int vesa_off_interval;
 184 static int blankinterval = 10*60;
 185 core_param(consoleblank, blankinterval, int, 0444);
 186
 187 static DECLARE_WORK(console_work, console_callback);
 188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 189
 190 /*
 191  * fg_console is the current virtual console,
 192  * last_console is the last used one,
 193  * want_console is the console we want to switch to,
 194  * saved_* variants are for save/restore around kernel debugger enter/leave
 195  */
 196 int fg_console;
 197 int last_console;
 198 int want_console = -1;
 199 static int saved_fg_console;
 200 static int saved_last_console;
 201 static int saved_want_console;
 202 static int saved_vc_mode;
 203 static int saved_console_blanked;
 204
 205 /*
 206  * For each existing display, we have a pointer to console currently visible
 207  * on that display, allowing consoles other than fg_console to be refreshed
 208  * appropriately. Unless the low-level driver supplies its own display_fg
 209  * variable, we use this one for the "master display".
 210  */
 211 static struct vc_data *master_display_fg;
 212
 213 /*
 214  * Unfortunately, we need to delay tty echo when we're currently writing to the
 215  * console since the code is (and always was) not re-entrant, so we schedule
 216  * all flip requests to process context with schedule-task() and run it from
 217  * console_callback().
 218  */
 219
 220 /*
 221  * For the same reason, we defer scrollback to the console callback.
 222  */
 223 static int scrollback_delta;
 224
 225 /*
 226  * Hook so that the power management routines can (un)blank
 227  * the console on our behalf.
 228  */
 229 int (*console_blank_hook)(int);
 230
 231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 232 static int blank_state;
 233 static int blank_timer_expired;
 234 enum {
 235         blank_off = 0,
 236         blank_normal_wait,
 237         blank_vesa_wait,
 238 };
 239
 240 /*
 241  * /sys/class/tty/tty0/
 242  *
 243  * the attribute 'active' contains the name of the current vc
 244  * console and it supports poll() to detect vc switches
 245  */
 246 static struct device *tty0dev;
 247
 248 /*
 249  * Notifier list for console events.
 250  */
 251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 252
 253 int register_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(register_vt_notifier);
 258
 259 int unregister_vt_notifier(struct notifier_block *nb)
 260 {
 261         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 262 }
 263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 264
 265 static void notify_write(struct vc_data *vc, unsigned int unicode)
 266 {
 267         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 269 }
 270
 271 static void notify_update(struct vc_data *vc)
 272 {
 273         struct vt_notifier_param param = { .vc = vc };
 274         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 275 }
 276 /*
 277  *      Low-Level Functions
 278  */
 279
 280 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 281
 282 #ifdef VT_BUF_VRAM_ONLY
 283 #define DO_UPDATE(vc)   0
 284 #else
 285 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 286 #endif
 287
 288 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 289 {
 290         unsigned short *p;
 291
 292         if (!viewed)
 293                 p = (unsigned short *)(vc->vc_origin + offset);
 294         else if (!vc->vc_sw->con_screen_pos)
 295                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 296         else
 297                 p = vc->vc_sw->con_screen_pos(vc, offset);
 298         return p;
 299 }
 300
 301 /* Called  from the keyboard irq path.. */
 302 static inline void scrolldelta(int lines)
 303 {
 304         /* FIXME */
 305         /* scrolldelta needs some kind of consistency lock, but the BKL was
 306            and still is not protecting versus the scheduled back end */
 307         scrollback_delta += lines;
 308         schedule_console_callback();
 309 }
 310
 311 void schedule_console_callback(void)
 312 {
 313         schedule_work(&console_work);
 314 }
 315
 316 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 317 {
 318         unsigned short *d, *s;
 319
 320         if (t+nr >= b)
 321                 nr = b - t - 1;
 322         if (b > vc->vc_rows || t >= b || nr < 1)
 323                 return;
 324         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 325                 return;
 326         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 327         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 328         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 329         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 330                     vc->vc_size_row * nr);
 331 }
 332
 333 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 334 {
 335         unsigned short *s;
 336         unsigned int step;
 337
 338         if (t+nr >= b)
 339                 nr = b - t - 1;
 340         if (b > vc->vc_rows || t >= b || nr < 1)
 341                 return;
 342         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 343                 return;
 344         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 345         step = vc->vc_cols * nr;
 346         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 347         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 348 }
 349
 350 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 351 {
 352 #ifndef VT_BUF_VRAM_ONLY
 353         unsigned int xx, yy, offset;
 354         u16 *p;
 355
 356         p = (u16 *) start;
 357         if (!vc->vc_sw->con_getxy) {
 358                 offset = (start - vc->vc_origin) / 2;
 359                 xx = offset % vc->vc_cols;
 360                 yy = offset / vc->vc_cols;
 361         } else {
 362                 int nxx, nyy;
 363                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 364                 xx = nxx; yy = nyy;
 365         }
 366         for(;;) {
 367                 u16 attrib = scr_readw(p) & 0xff00;
 368                 int startx = xx;
 369                 u16 *q = p;
 370                 while (xx < vc->vc_cols && count) {
 371                         if (attrib != (scr_readw(p) & 0xff00)) {
 372                                 if (p > q)
 373                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 374                                 startx = xx;
 375                                 q = p;
 376                                 attrib = scr_readw(p) & 0xff00;
 377                         }
 378                         p++;
 379                         xx++;
 380                         count--;
 381                 }
 382                 if (p > q)
 383                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 384                 if (!count)
 385                         break;
 386                 xx = 0;
 387                 yy++;
 388                 if (vc->vc_sw->con_getxy) {
 389                         p = (u16 *)start;
 390                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 391                 }
 392         }
 393 #endif
 394 }
 395
 396 void update_region(struct vc_data *vc, unsigned long start, int count)
 397 {
 398         WARN_CONSOLE_UNLOCKED();
 399
 400         if (DO_UPDATE(vc)) {
 401                 hide_cursor(vc);
 402                 do_update_region(vc, start, count);
 403                 set_cursor(vc);
 404         }
 405 }
 406
 407 /* Structure of attributes is hardware-dependent */
 408
 409 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 410     u8 _underline, u8 _reverse, u8 _italic)
 411 {
 412         if (vc->vc_sw->con_build_attr)
 413                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 414                        _blink, _underline, _reverse, _italic);
 415
 416 #ifndef VT_BUF_VRAM_ONLY
 417 /*
 418  * ++roman: I completely changed the attribute format for monochrome
 419  * mode (!can_do_color). The formerly used MDA (monochrome display
 420  * adapter) format didn't allow the combination of certain effects.
 421  * Now the attribute is just a bit vector:
 422  *  Bit 0..1: intensity (0..2)
 423  *  Bit 2   : underline
 424  *  Bit 3   : reverse
 425  *  Bit 7   : blink
 426  */
 427         {
 428         u8 a = _color;
 429         if (!vc->vc_can_do_color)
 430                 return _intensity |
 431                        (_italic ? 2 : 0) |
 432                        (_underline ? 4 : 0) |
 433                        (_reverse ? 8 : 0) |
 434                        (_blink ? 0x80 : 0);
 435         if (_italic)
 436                 a = (a & 0xF0) | vc->vc_itcolor;
 437         else if (_underline)
 438                 a = (a & 0xf0) | vc->vc_ulcolor;
 439         else if (_intensity == 0)
 440                 a = (a & 0xf0) | vc->vc_ulcolor;
 441         if (_reverse)
 442                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 443         if (_blink)
 444                 a ^= 0x80;
 445         if (_intensity == 2)
 446                 a ^= 0x08;
 447         if (vc->vc_hi_font_mask == 0x100)
 448                 a <<= 1;
 449         return a;
 450         }
 451 #else
 452         return 0;
 453 #endif
 454 }
 455
 456 static void update_attr(struct vc_data *vc)
 457 {
 458         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 459                       vc->vc_blink, vc->vc_underline,
 460                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 461         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 462 }
 463
 464 /* Note: inverting the screen twice should revert to the original state */
 465 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 466 {
 467         unsigned short *p;
 468
 469         WARN_CONSOLE_UNLOCKED();
 470
 471         count /= 2;
 472         p = screenpos(vc, offset, viewed);
 473         if (vc->vc_sw->con_invert_region)
 474                 vc->vc_sw->con_invert_region(vc, p, count);
 475 #ifndef VT_BUF_VRAM_ONLY
 476         else {
 477                 u16 *q = p;
 478                 int cnt = count;
 479                 u16 a;
 480
 481                 if (!vc->vc_can_do_color) {
 482                         while (cnt--) {
 483                             a = scr_readw(q);
 484                             a ^= 0x0800;
 485                             scr_writew(a, q);
 486                             q++;
 487                         }
 488                 } else if (vc->vc_hi_font_mask == 0x100) {
 489                         while (cnt--) {
 490                                 a = scr_readw(q);
 491                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 492                                 scr_writew(a, q);
 493                                 q++;
 494                         }
 495                 } else {
 496                         while (cnt--) {
 497                                 a = scr_readw(q);
 498                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 499                                 scr_writew(a, q);
 500                                 q++;
 501                         }
 502                 }
 503         }
 504 #endif
 505         if (DO_UPDATE(vc))
 506                 do_update_region(vc, (unsigned long) p, count);
 507         notify_update(vc);
 508 }
 509
 510 /* used by selection: complement pointer position */
 511 void complement_pos(struct vc_data *vc, int offset)
 512 {
 513         static int old_offset = -1;
 514         static unsigned short old;
 515         static unsigned short oldx, oldy;
 516
 517         WARN_CONSOLE_UNLOCKED();
 518
 519         if (old_offset != -1 && old_offset >= 0 &&
 520             old_offset < vc->vc_screenbuf_size) {
 521                 scr_writew(old, screenpos(vc, old_offset, 1));
 522                 if (DO_UPDATE(vc))
 523                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 524                 notify_update(vc);
 525         }
 526
 527         old_offset = offset;
 528
 529         if (offset != -1 && offset >= 0 &&
 530             offset < vc->vc_screenbuf_size) {
 531                 unsigned short new;
 532                 unsigned short *p;
 533                 p = screenpos(vc, offset, 1);
 534                 old = scr_readw(p);
 535                 new = old ^ vc->vc_complement_mask;
 536                 scr_writew(new, p);
 537                 if (DO_UPDATE(vc)) {
 538                         oldx = (offset >> 1) % vc->vc_cols;
 539                         oldy = (offset >> 1) / vc->vc_cols;
 540                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 541                 }
 542                 notify_update(vc);
 543         }
 544 }
 545
 546 static void insert_char(struct vc_data *vc, unsigned int nr)
 547 {
 548         unsigned short *p = (unsigned short *) vc->vc_pos;
 549
 550         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 551         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 552         vc->vc_need_wrap = 0;
 553         if (DO_UPDATE(vc))
 554                 do_update_region(vc, (unsigned long) p,
 555                         vc->vc_cols - vc->vc_x);
 556 }
 557
 558 static void delete_char(struct vc_data *vc, unsigned int nr)
 559 {
 560         unsigned short *p = (unsigned short *) vc->vc_pos;
 561
 562         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 563         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 564                         nr * 2);
 565         vc->vc_need_wrap = 0;
 566         if (DO_UPDATE(vc))
 567                 do_update_region(vc, (unsigned long) p,
 568                         vc->vc_cols - vc->vc_x);
 569 }
 570
 571 static int softcursor_original = -1;
 572
 573 static void add_softcursor(struct vc_data *vc)
 574 {
 575         int i = scr_readw((u16 *) vc->vc_pos);
 576         u32 type = vc->vc_cursor_type;
 577
 578         if (! (type & 0x10)) return;
 579         if (softcursor_original != -1) return;
 580         softcursor_original = i;
 581         i |= ((type >> 8) & 0xff00 );
 582         i ^= ((type) & 0xff00 );
 583         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 584         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 585         scr_writew(i, (u16 *) vc->vc_pos);
 586         if (DO_UPDATE(vc))
 587                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 588 }
 589
 590 static void hide_softcursor(struct vc_data *vc)
 591 {
 592         if (softcursor_original != -1) {
 593                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 594                 if (DO_UPDATE(vc))
 595                         vc->vc_sw->con_putc(vc, softcursor_original,
 596                                         vc->vc_y, vc->vc_x);
 597                 softcursor_original = -1;
 598         }
 599 }
 600
 601 static void hide_cursor(struct vc_data *vc)
 602 {
 603         if (vc == sel_cons)
 604                 clear_selection();
 605         vc->vc_sw->con_cursor(vc, CM_ERASE);
 606         hide_softcursor(vc);
 607 }
 608
 609 static void set_cursor(struct vc_data *vc)
 610 {
 611         if (!IS_FG(vc) || console_blanked ||
 612             vc->vc_mode == KD_GRAPHICS)
 613                 return;
 614         if (vc->vc_deccm) {
 615                 if (vc == sel_cons)
 616                         clear_selection();
 617                 add_softcursor(vc);
 618                 if ((vc->vc_cursor_type & 0x0f) != 1)
 619                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 620         } else
 621                 hide_cursor(vc);
 622 }
 623
 624 static void set_origin(struct vc_data *vc)
 625 {
 626         WARN_CONSOLE_UNLOCKED();
 627
 628         if (!CON_IS_VISIBLE(vc) ||
 629             !vc->vc_sw->con_set_origin ||
 630             !vc->vc_sw->con_set_origin(vc))
 631                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 632         vc->vc_visible_origin = vc->vc_origin;
 633         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 634         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 635 }
 636
 637 static void save_screen(struct vc_data *vc)
 638 {
 639         WARN_CONSOLE_UNLOCKED();
 640
 641         if (vc->vc_sw->con_save_screen)
 642                 vc->vc_sw->con_save_screen(vc);
 643 }
 644
 645 /*
 646  *      Redrawing of screen
 647  */
 648
 649 void clear_buffer_attributes(struct vc_data *vc)
 650 {
 651         unsigned short *p = (unsigned short *)vc->vc_origin;
 652         int count = vc->vc_screenbuf_size / 2;
 653         int mask = vc->vc_hi_font_mask | 0xff;
 654
 655         for (; count > 0; count--, p++) {
 656                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 657         }
 658 }
 659
 660 void redraw_screen(struct vc_data *vc, int is_switch)
 661 {
 662         int redraw = 0;
 663
 664         WARN_CONSOLE_UNLOCKED();
 665
 666         if (!vc) {
 667                 /* strange ... */
 668                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 669                 return;
 670         }
 671
 672         if (is_switch) {
 673                 struct vc_data *old_vc = vc_cons[fg_console].d;
 674                 if (old_vc == vc)
 675                         return;
 676                 if (!CON_IS_VISIBLE(vc))
 677                         redraw = 1;
 678                 *vc->vc_display_fg = vc;
 679                 fg_console = vc->vc_num;
 680                 hide_cursor(old_vc);
 681                 if (!CON_IS_VISIBLE(old_vc)) {
 682                         save_screen(old_vc);
 683                         set_origin(old_vc);
 684                 }
 685                 if (tty0dev)
 686                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 687         } else {
 688                 hide_cursor(vc);
 689                 redraw = 1;
 690         }
 691
 692         if (redraw) {
 693                 int update;
 694                 int old_was_color = vc->vc_can_do_color;
 695
 696                 set_origin(vc);
 697                 update = vc->vc_sw->con_switch(vc);
 698                 set_palette(vc);
 699                 /*
 700                  * If console changed from mono<->color, the best we can do
 701                  * is to clear the buffer attributes. As it currently stands,
 702                  * rebuilding new attributes from the old buffer is not doable
 703                  * without overly complex code.
 704                  */
 705                 if (old_was_color != vc->vc_can_do_color) {
 706                         update_attr(vc);
 707                         clear_buffer_attributes(vc);
 708                 }
 709
 710                 /* Forcibly update if we're panicing */
 711                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 712                     vt_force_oops_output(vc))
 713                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 714         }
 715         set_cursor(vc);
 716         if (is_switch) {
 717                 set_leds();
 718                 compute_shiftstate();
 719                 notify_update(vc);
 720         }
 721 }
 722
 723 /*
 724  *      Allocation, freeing and resizing of VTs.
 725  */
 726
 727 int vc_cons_allocated(unsigned int i)
 728 {
 729         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 730 }
 731
 732 static void visual_init(struct vc_data *vc, int num, int init)
 733 {
 734         /* ++Geert: vc->vc_sw->con_init determines console size */
 735         if (vc->vc_sw)
 736                 module_put(vc->vc_sw->owner);
 737         vc->vc_sw = conswitchp;
 738 #ifndef VT_SINGLE_DRIVER
 739         if (con_driver_map[num])
 740                 vc->vc_sw = con_driver_map[num];
 741 #endif
 742         __module_get(vc->vc_sw->owner);
 743         vc->vc_num = num;
 744         vc->vc_display_fg = &master_display_fg;
 745         if (vc->vc_uni_pagedir_loc)
 746                 con_free_unimap(vc);
 747         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 748         vc->vc_uni_pagedir = NULL;
 749         vc->vc_hi_font_mask = 0;
 750         vc->vc_complement_mask = 0;
 751         vc->vc_can_do_color = 0;
 752         vc->vc_panic_force_write = false;
 753         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
 754         vc->vc_sw->con_init(vc, init);
 755         if (!vc->vc_complement_mask)
 756                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 757         vc->vc_s_complement_mask = vc->vc_complement_mask;
 758         vc->vc_size_row = vc->vc_cols << 1;
 759         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 760 }
 761
 762 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 763 {
 764         struct vt_notifier_param param;
 765         struct vc_data *vc;
 766
 767         WARN_CONSOLE_UNLOCKED();
 768
 769         if (currcons >= MAX_NR_CONSOLES)
 770                 return -ENXIO;
 771
 772         if (vc_cons[currcons].d)
 773                 return 0;
 774
 775         /* due to the granularity of kmalloc, we waste some memory here */
 776         /* the alloc is done in two steps, to optimize the common situation
 777            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 778         /* although the numbers above are not valid since long ago, the
 779            point is still up-to-date and the comment still has its value
 780            even if only as a historical artifact.  --mj, July 1998 */
 781         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 782         if (!vc)
 783                 return -ENOMEM;
 784
 785         vc_cons[currcons].d = vc;
 786         tty_port_init(&vc->port);
 787         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 788
 789         visual_init(vc, currcons, 1);
 790
 791         if (!*vc->vc_uni_pagedir_loc)
 792                 con_set_default_unimap(vc);
 793
 794         vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 795         if (!vc->vc_screenbuf)
 796                 goto err_free;
 797
 798         /* If no drivers have overridden us and the user didn't pass a
 799            boot option, default to displaying the cursor */
 800         if (global_cursor_default == -1)
 801                 global_cursor_default = 1;
 802
 803         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 804         vcs_make_sysfs(currcons);
 805         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 806
 807         return 0;
 808 err_free:
 809         kfree(vc);
 810         vc_cons[currcons].d = NULL;
 811         return -ENOMEM;
 812 }
 813
 814 static inline int resize_screen(struct vc_data *vc, int width, int height,
 815                                 int user)
 816 {
 817         /* Resizes the resolution of the display adapater */
 818         int err = 0;
 819
 820         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 821                 err = vc->vc_sw->con_resize(vc, width, height, user);
 822
 823         return err;
 824 }
 825
 826 /*
 827  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 828  * [this is to be used together with some user program
 829  * like resize that changes the hardware videomode]
 830  */
 831 #define VC_RESIZE_MAXCOL (32767)
 832 #define VC_RESIZE_MAXROW (32767)
 833
 834 /**
 835  *      vc_do_resize    -       resizing method for the tty
 836  *      @tty: tty being resized
 837  *      @real_tty: real tty (different to tty if a pty/tty pair)
 838  *      @vc: virtual console private data
 839  *      @cols: columns
 840  *      @lines: lines
 841  *
 842  *      Resize a virtual console, clipping according to the actual constraints.
 843  *      If the caller passes a tty structure then update the termios winsize
 844  *      information and perform any necessary signal handling.
 845  *
 846  *      Caller must hold the console semaphore. Takes the termios rwsem and
 847  *      ctrl_lock of the tty IFF a tty is passed.
 848  */
 849
 850 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 851                                 unsigned int cols, unsigned int lines)
 852 {
 853         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 854         unsigned long end;
 855         unsigned int old_rows, old_row_size;
 856         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 857         unsigned int user;
 858         unsigned short *newscreen;
 859
 860         WARN_CONSOLE_UNLOCKED();
 861
 862         if (!vc)
 863                 return -ENXIO;
 864
 865         user = vc->vc_resize_user;
 866         vc->vc_resize_user = 0;
 867
 868         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 869                 return -EINVAL;
 870
 871         new_cols = (cols ? cols : vc->vc_cols);
 872         new_rows = (lines ? lines : vc->vc_rows);
 873         new_row_size = new_cols << 1;
 874         new_screen_size = new_row_size * new_rows;
 875
 876         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 877                 return 0;
 878
 879         newscreen = kmalloc(new_screen_size, GFP_USER);
 880         if (!newscreen)
 881                 return -ENOMEM;
 882
 883         old_rows = vc->vc_rows;
 884         old_row_size = vc->vc_size_row;
 885
 886         err = resize_screen(vc, new_cols, new_rows, user);
 887         if (err) {
 888                 kfree(newscreen);
 889                 return err;
 890         }
 891
 892         vc->vc_rows = new_rows;
 893         vc->vc_cols = new_cols;
 894         vc->vc_size_row = new_row_size;
 895         vc->vc_screenbuf_size = new_screen_size;
 896
 897         rlth = min(old_row_size, new_row_size);
 898         rrem = new_row_size - rlth;
 899         old_origin = vc->vc_origin;
 900         new_origin = (long) newscreen;
 901         new_scr_end = new_origin + new_screen_size;
 902
 903         if (vc->vc_y > new_rows) {
 904                 if (old_rows - vc->vc_y < new_rows) {
 905                         /*
 906                          * Cursor near the bottom, copy contents from the
 907                          * bottom of buffer
 908                          */
 909                         old_origin += (old_rows - new_rows) * old_row_size;
 910                 } else {
 911                         /*
 912                          * Cursor is in no man's land, copy 1/2 screenful
 913                          * from the top and bottom of cursor position
 914                          */
 915                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 916                 }
 917         }
 918
 919         end = old_origin + old_row_size * min(old_rows, new_rows);
 920
 921         update_attr(vc);
 922
 923         while (old_origin < end) {
 924                 scr_memcpyw((unsigned short *) new_origin,
 925                             (unsigned short *) old_origin, rlth);
 926                 if (rrem)
 927                         scr_memsetw((void *)(new_origin + rlth),
 928                                     vc->vc_video_erase_char, rrem);
 929                 old_origin += old_row_size;
 930                 new_origin += new_row_size;
 931         }
 932         if (new_scr_end > new_origin)
 933                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 934                             new_scr_end - new_origin);
 935         kfree(vc->vc_screenbuf);
 936         vc->vc_screenbuf = newscreen;
 937         vc->vc_screenbuf_size = new_screen_size;
 938         set_origin(vc);
 939
 940         /* do part of a reset_terminal() */
 941         vc->vc_top = 0;
 942         vc->vc_bottom = vc->vc_rows;
 943         gotoxy(vc, vc->vc_x, vc->vc_y);
 944         save_cur(vc);
 945
 946         if (tty) {
 947                 /* Rewrite the requested winsize data with the actual
 948                    resulting sizes */
 949                 struct winsize ws;
 950                 memset(&ws, 0, sizeof(ws));
 951                 ws.ws_row = vc->vc_rows;
 952                 ws.ws_col = vc->vc_cols;
 953                 ws.ws_ypixel = vc->vc_scan_lines;
 954                 tty_do_resize(tty, &ws);
 955         }
 956
 957         if (CON_IS_VISIBLE(vc))
 958                 update_screen(vc);
 959         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 960         return err;
 961 }
 962
 963 /**
 964  *      vc_resize               -       resize a VT
 965  *      @vc: virtual console
 966  *      @cols: columns
 967  *      @rows: rows
 968  *
 969  *      Resize a virtual console as seen from the console end of things. We
 970  *      use the common vc_do_resize methods to update the structures. The
 971  *      caller must hold the console sem to protect console internals and
 972  *      vc->port.tty
 973  */
 974
 975 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 976 {
 977         return vc_do_resize(vc->port.tty, vc, cols, rows);
 978 }
 979
 980 /**
 981  *      vt_resize               -       resize a VT
 982  *      @tty: tty to resize
 983  *      @ws: winsize attributes
 984  *
 985  *      Resize a virtual terminal. This is called by the tty layer as we
 986  *      register our own handler for resizing. The mutual helper does all
 987  *      the actual work.
 988  *
 989  *      Takes the console sem and the called methods then take the tty
 990  *      termios_rwsem and the tty ctrl_lock in that order.
 991  */
 992 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 993 {
 994         struct vc_data *vc = tty->driver_data;
 995         int ret;
 996
 997         console_lock();
 998         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 999         console_unlock();
1000         return ret;
1001 }
1002
1003 struct vc_data *vc_deallocate(unsigned int currcons)
1004 {
1005         struct vc_data *vc = NULL;
1006
1007         WARN_CONSOLE_UNLOCKED();
1008
1009         if (vc_cons_allocated(currcons)) {
1010                 struct vt_notifier_param param;
1011
1012                 param.vc = vc = vc_cons[currcons].d;
1013                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1014                 vcs_remove_sysfs(currcons);
1015                 vc->vc_sw->con_deinit(vc);
1016                 put_pid(vc->vt_pid);
1017                 module_put(vc->vc_sw->owner);
1018                 kfree(vc->vc_screenbuf);
1019                 vc_cons[currcons].d = NULL;
1020         }
1021         return vc;
1022 }
1023
1024 /*
1025  *      VT102 emulator
1026  */
1027
1028 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1029 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1030 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1031
1032 #define decarm          VC_REPEAT
1033 #define decckm          VC_CKMODE
1034 #define kbdapplic       VC_APPLIC
1035 #define lnm             VC_CRLF
1036
1037 /*
1038  * this is what the terminal answers to a ESC-Z or csi0c query.
1039  */
1040 #define VT100ID "\033[?1;2c"
1041 #define VT102ID "\033[?6c"
1042
1043 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1044                                        8,12,10,14, 9,13,11,15 };
1045
1046 /* the default colour table, for VGA+ colour systems */
1047 unsigned char default_red[] = {
1048         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1049         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1050 };
1051 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1052
1053 unsigned char default_grn[] = {
1054         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1055         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1056 };
1057 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1058
1059 unsigned char default_blu[] = {
1060         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1061         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1062 };
1063 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1064
1065 /*
1066  * gotoxy() must verify all boundaries, because the arguments
1067  * might also be negative. If the given position is out of
1068  * bounds, the cursor is placed at the nearest margin.
1069  */
1070 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1071 {
1072         int min_y, max_y;
1073
1074         if (new_x < 0)
1075                 vc->vc_x = 0;
1076         else {
1077                 if (new_x >= vc->vc_cols)
1078                         vc->vc_x = vc->vc_cols - 1;
1079                 else
1080                         vc->vc_x = new_x;
1081         }
1082
1083         if (vc->vc_decom) {
1084                 min_y = vc->vc_top;
1085                 max_y = vc->vc_bottom;
1086         } else {
1087                 min_y = 0;
1088                 max_y = vc->vc_rows;
1089         }
1090         if (new_y < min_y)
1091                 vc->vc_y = min_y;
1092         else if (new_y >= max_y)
1093                 vc->vc_y = max_y - 1;
1094         else
1095                 vc->vc_y = new_y;
1096         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1097         vc->vc_need_wrap = 0;
1098 }
1099
1100 /* for absolute user moves, when decom is set */
1101 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1102 {
1103         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1104 }
1105
1106 void scrollback(struct vc_data *vc, int lines)
1107 {
1108         if (!lines)
1109                 lines = vc->vc_rows / 2;
1110         scrolldelta(-lines);
1111 }
1112
1113 void scrollfront(struct vc_data *vc, int lines)
1114 {
1115         if (!lines)
1116                 lines = vc->vc_rows / 2;
1117         scrolldelta(lines);
1118 }
1119
1120 static void lf(struct vc_data *vc)
1121 {
1122         /* don't scroll if above bottom of scrolling region, or
1123          * if below scrolling region
1124          */
1125         if (vc->vc_y + 1 == vc->vc_bottom)
1126                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1127         else if (vc->vc_y < vc->vc_rows - 1) {
1128                 vc->vc_y++;
1129                 vc->vc_pos += vc->vc_size_row;
1130         }
1131         vc->vc_need_wrap = 0;
1132         notify_write(vc, '\n');
1133 }
1134
1135 static void ri(struct vc_data *vc)
1136 {
1137         /* don't scroll if below top of scrolling region, or
1138          * if above scrolling region
1139          */
1140         if (vc->vc_y == vc->vc_top)
1141                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1142         else if (vc->vc_y > 0) {
1143                 vc->vc_y--;
1144                 vc->vc_pos -= vc->vc_size_row;
1145         }
1146         vc->vc_need_wrap = 0;
1147 }
1148
1149 static inline void cr(struct vc_data *vc)
1150 {
1151         vc->vc_pos -= vc->vc_x << 1;
1152         vc->vc_need_wrap = vc->vc_x = 0;
1153         notify_write(vc, '\r');
1154 }
1155
1156 static inline void bs(struct vc_data *vc)
1157 {
1158         if (vc->vc_x) {
1159                 vc->vc_pos -= 2;
1160                 vc->vc_x--;
1161                 vc->vc_need_wrap = 0;
1162                 notify_write(vc, '\b');
1163         }
1164 }
1165
1166 static inline void del(struct vc_data *vc)
1167 {
1168         /* ignored */
1169 }
1170
1171 static void csi_J(struct vc_data *vc, int vpar)
1172 {
1173         unsigned int count;
1174         unsigned short * start;
1175
1176         switch (vpar) {
1177                 case 0: /* erase from cursor to end of display */
1178                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1179                         start = (unsigned short *)vc->vc_pos;
1180                         break;
1181                 case 1: /* erase from start to cursor */
1182                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1183                         start = (unsigned short *)vc->vc_origin;
1184                         break;
1185                 case 3: /* erase scroll-back buffer (and whole display) */
1186                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1187                                     vc->vc_screenbuf_size >> 1);
1188                         set_origin(vc);
1189                         if (CON_IS_VISIBLE(vc))
1190                                 update_screen(vc);
1191                         /* fall through */
1192                 case 2: /* erase whole display */
1193                         count = vc->vc_cols * vc->vc_rows;
1194                         start = (unsigned short *)vc->vc_origin;
1195                         break;
1196                 default:
1197                         return;
1198         }
1199         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1200         if (DO_UPDATE(vc))
1201                 do_update_region(vc, (unsigned long) start, count);
1202         vc->vc_need_wrap = 0;
1203 }
1204
1205 static void csi_K(struct vc_data *vc, int vpar)
1206 {
1207         unsigned int count;
1208         unsigned short * start;
1209
1210         switch (vpar) {
1211                 case 0: /* erase from cursor to end of line */
1212                         count = vc->vc_cols - vc->vc_x;
1213                         start = (unsigned short *)vc->vc_pos;
1214                         break;
1215                 case 1: /* erase from start of line to cursor */
1216                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1217                         count = vc->vc_x + 1;
1218                         break;
1219                 case 2: /* erase whole line */
1220                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1221                         count = vc->vc_cols;
1222                         break;
1223                 default:
1224                         return;
1225         }
1226         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1227         vc->vc_need_wrap = 0;
1228         if (DO_UPDATE(vc))
1229                 do_update_region(vc, (unsigned long) start, count);
1230 }
1231
1232 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1233 {                                         /* not vt100? */
1234         int count;
1235
1236         if (!vpar)
1237                 vpar++;
1238         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1239
1240         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1241         if (DO_UPDATE(vc))
1242                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1243         vc->vc_need_wrap = 0;
1244 }
1245
1246 static void default_attr(struct vc_data *vc)
1247 {
1248         vc->vc_intensity = 1;
1249         vc->vc_italic = 0;
1250         vc->vc_underline = 0;
1251         vc->vc_reverse = 0;
1252         vc->vc_blink = 0;
1253         vc->vc_color = vc->vc_def_color;
1254 }
1255
1256 struct rgb { u8 r; u8 g; u8 b; };
1257
1258 static struct rgb rgb_from_256(int i)
1259 {
1260         struct rgb c;
1261         if (i < 8) {            /* Standard colours. */
1262                 c.r = i&1 ? 0xaa : 0x00;
1263                 c.g = i&2 ? 0xaa : 0x00;
1264                 c.b = i&4 ? 0xaa : 0x00;
1265         } else if (i < 16) {
1266                 c.r = i&1 ? 0xff : 0x55;
1267                 c.g = i&2 ? 0xff : 0x55;
1268                 c.b = i&4 ? 0xff : 0x55;
1269         } else if (i < 232) {   /* 6x6x6 colour cube. */
1270                 c.r = (i - 16) / 36 * 85 / 2;
1271                 c.g = (i - 16) / 6 % 6 * 85 / 2;
1272                 c.b = (i - 16) % 6 * 85 / 2;
1273         } else                  /* Grayscale ramp. */
1274                 c.r = c.g = c.b = i * 10 - 2312;
1275         return c;
1276 }
1277
1278 static void rgb_foreground(struct vc_data *vc, struct rgb c)
1279 {
1280         u8 hue, max = c.r;
1281         if (c.g > max)
1282                 max = c.g;
1283         if (c.b > max)
1284                 max = c.b;
1285         hue = (c.r > max/2 ? 4 : 0)
1286             | (c.g > max/2 ? 2 : 0)
1287             | (c.b > max/2 ? 1 : 0);
1288         if (hue == 7 && max <= 0x55)
1289                 hue = 0, vc->vc_intensity = 2;
1290         else
1291                 vc->vc_intensity = (max > 0xaa) + 1;
1292         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1293 }
1294
1295 static void rgb_background(struct vc_data *vc, struct rgb c)
1296 {
1297         /* For backgrounds, err on the dark side. */
1298         vc->vc_color = (vc->vc_color & 0x0f)
1299                 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1300 }
1301
1302 /* console_lock is held */
1303 static void csi_m(struct vc_data *vc)
1304 {
1305         int i;
1306
1307         for (i = 0; i <= vc->vc_npar; i++)
1308                 switch (vc->vc_par[i]) {
1309                         case 0: /* all attributes off */
1310                                 default_attr(vc);
1311                                 break;
1312                         case 1:
1313                                 vc->vc_intensity = 2;
1314                                 break;
1315                         case 2:
1316                                 vc->vc_intensity = 0;
1317                                 break;
1318                         case 3:
1319                                 vc->vc_italic = 1;
1320                                 break;
1321                         case 4:
1322                                 vc->vc_underline = 1;
1323                                 break;
1324                         case 5:
1325                                 vc->vc_blink = 1;
1326                                 break;
1327                         case 7:
1328                                 vc->vc_reverse = 1;
1329                                 break;
1330                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1331                                   * Select primary font, don't display
1332                                   * control chars if defined, don't set
1333                                   * bit 8 on output.
1334                                   */
1335                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1336                                                 ? vc->vc_G0_charset
1337                                                 : vc->vc_G1_charset, vc);
1338                                 vc->vc_disp_ctrl = 0;
1339                                 vc->vc_toggle_meta = 0;
1340                                 break;
1341                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1342                                   * Select first alternate font, lets
1343                                   * chars < 32 be displayed as ROM chars.
1344                                   */
1345                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1346                                 vc->vc_disp_ctrl = 1;
1347                                 vc->vc_toggle_meta = 0;
1348                                 break;
1349                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1350                                   * Select second alternate font, toggle
1351                                   * high bit before displaying as ROM char.
1352                                   */
1353                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1354                                 vc->vc_disp_ctrl = 1;
1355                                 vc->vc_toggle_meta = 1;
1356                                 break;
1357                         case 21:
1358                         case 22:
1359                                 vc->vc_intensity = 1;
1360                                 break;
1361                         case 23:
1362                                 vc->vc_italic = 0;
1363                                 break;
1364                         case 24:
1365                                 vc->vc_underline = 0;
1366                                 break;
1367                         case 25:
1368                                 vc->vc_blink = 0;
1369                                 break;
1370                         case 27:
1371                                 vc->vc_reverse = 0;
1372                                 break;
1373                         case 38: /* ITU T.416
1374                                   * Higher colour modes.
1375                                   * They break the usual properties of SGR codes
1376                                   * and thus need to be detected and ignored by
1377                                   * hand.  Strictly speaking, that standard also
1378                                   * wants : rather than ; as separators, contrary
1379                                   * to ECMA-48, but no one produces such codes
1380                                   * and almost no one accepts them.
1381                                   */
1382                                 i++;
1383                                 if (i > vc->vc_npar)
1384                                         break;
1385                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1386                                     i < vc->vc_npar) {     /* ubiquitous */
1387                                         i++;
1388                                         rgb_foreground(vc,
1389                                                 rgb_from_256(vc->vc_par[i]));
1390                                 } else if (vc->vc_par[i] == 2 &&  /* 24 bit */
1391                                            i <= vc->vc_npar + 3) {/* extremely rare */
1392                                         struct rgb c = {
1393                                                 .r = vc->vc_par[i + 1],
1394                                                 .g = vc->vc_par[i + 2],
1395                                                 .b = vc->vc_par[i + 3],
1396                                         };
1397                                         rgb_foreground(vc, c);
1398                                         i += 3;
1399                                 }
1400                                 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1401                                  * there's no point in supporting them.
1402                                  */
1403                                 break;
1404                         case 48:
1405                                 i++;
1406                                 if (i > vc->vc_npar)
1407                                         break;
1408                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1409                                     i < vc->vc_npar) {
1410                                         i++;
1411                                         rgb_background(vc,
1412                                                 rgb_from_256(vc->vc_par[i]));
1413                                 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1414                                            i <= vc->vc_npar + 3) {
1415                                         struct rgb c = {
1416                                                 .r = vc->vc_par[i + 1],
1417                                                 .g = vc->vc_par[i + 2],
1418                                                 .b = vc->vc_par[i + 3],
1419                                         };
1420                                         rgb_background(vc, c);
1421                                         i += 3;
1422                                 }
1423                                 break;
1424                         case 39:
1425                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1426                                 break;
1427                         case 49:
1428                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1429                                 break;
1430                         default:
1431                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1432                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1433                                                 | (vc->vc_color & 0xf0);
1434                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1435                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1436                                                 | (vc->vc_color & 0x0f);
1437                                 break;
1438                 }
1439         update_attr(vc);
1440 }
1441
1442 static void respond_string(const char *p, struct tty_port *port)
1443 {
1444         while (*p) {
1445                 tty_insert_flip_char(port, *p, 0);
1446                 p++;
1447         }
1448         tty_schedule_flip(port);
1449 }
1450
1451 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1452 {
1453         char buf[40];
1454
1455         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1456         respond_string(buf, tty->port);
1457 }
1458
1459 static inline void status_report(struct tty_struct *tty)
1460 {
1461         respond_string("\033[0n", tty->port);   /* Terminal ok */
1462 }
1463
1464 static inline void respond_ID(struct tty_struct *tty)
1465 {
1466         respond_string(VT102ID, tty->port);
1467 }
1468
1469 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1470 {
1471         char buf[8];
1472
1473         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1474                 (char)('!' + mry));
1475         respond_string(buf, tty->port);
1476 }
1477
1478 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1479 int mouse_reporting(void)
1480 {
1481         return vc_cons[fg_console].d->vc_report_mouse;
1482 }
1483
1484 /* console_lock is held */
1485 static void set_mode(struct vc_data *vc, int on_off)
1486 {
1487         int i;
1488
1489         for (i = 0; i <= vc->vc_npar; i++)
1490                 if (vc->vc_ques) {
1491                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1492                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1493                                 if (on_off)
1494                                         set_kbd(vc, decckm);
1495                                 else
1496                                         clr_kbd(vc, decckm);
1497                                 break;
1498                         case 3: /* 80/132 mode switch unimplemented */
1499                                 vc->vc_deccolm = on_off;
1500 #if 0
1501                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1502                                 /* this alone does not suffice; some user mode
1503                                    utility has to change the hardware regs */
1504 #endif
1505                                 break;
1506                         case 5:                 /* Inverted screen on/off */
1507                                 if (vc->vc_decscnm != on_off) {
1508                                         vc->vc_decscnm = on_off;
1509                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1510                                         update_attr(vc);
1511                                 }
1512                                 break;
1513                         case 6:                 /* Origin relative/absolute */
1514                                 vc->vc_decom = on_off;
1515                                 gotoxay(vc, 0, 0);
1516                                 break;
1517                         case 7:                 /* Autowrap on/off */
1518                                 vc->vc_decawm = on_off;
1519                                 break;
1520                         case 8:                 /* Autorepeat on/off */
1521                                 if (on_off)
1522                                         set_kbd(vc, decarm);
1523                                 else
1524                                         clr_kbd(vc, decarm);
1525                                 break;
1526                         case 9:
1527                                 vc->vc_report_mouse = on_off ? 1 : 0;
1528                                 break;
1529                         case 25:                /* Cursor on/off */
1530                                 vc->vc_deccm = on_off;
1531                                 break;
1532                         case 1000:
1533                                 vc->vc_report_mouse = on_off ? 2 : 0;
1534                                 break;
1535                         }
1536                 } else {
1537                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1538                         case 3:                 /* Monitor (display ctrls) */
1539                                 vc->vc_disp_ctrl = on_off;
1540                                 break;
1541                         case 4:                 /* Insert Mode on/off */
1542                                 vc->vc_decim = on_off;
1543                                 break;
1544                         case 20:                /* Lf, Enter == CrLf/Lf */
1545                                 if (on_off)
1546                                         set_kbd(vc, lnm);
1547                                 else
1548                                         clr_kbd(vc, lnm);
1549                                 break;
1550                         }
1551                 }
1552 }
1553
1554 /* console_lock is held */
1555 static void setterm_command(struct vc_data *vc)
1556 {
1557         switch(vc->vc_par[0]) {
1558                 case 1: /* set color for underline mode */
1559                         if (vc->vc_can_do_color &&
1560                                         vc->vc_par[1] < 16) {
1561                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1562                                 if (vc->vc_underline)
1563                                         update_attr(vc);
1564                         }
1565                         break;
1566                 case 2: /* set color for half intensity mode */
1567                         if (vc->vc_can_do_color &&
1568                                         vc->vc_par[1] < 16) {
1569                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1570                                 if (vc->vc_intensity == 0)
1571                                         update_attr(vc);
1572                         }
1573                         break;
1574                 case 8: /* store colors as defaults */
1575                         vc->vc_def_color = vc->vc_attr;
1576                         if (vc->vc_hi_font_mask == 0x100)
1577                                 vc->vc_def_color >>= 1;
1578                         default_attr(vc);
1579                         update_attr(vc);
1580                         break;
1581                 case 9: /* set blanking interval */
1582                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1583                         poke_blanked_console();
1584                         break;
1585                 case 10: /* set bell frequency in Hz */
1586                         if (vc->vc_npar >= 1)
1587                                 vc->vc_bell_pitch = vc->vc_par[1];
1588                         else
1589                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1590                         break;
1591                 case 11: /* set bell duration in msec */
1592                         if (vc->vc_npar >= 1)
1593                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1594                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1595                         else
1596                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1597                         break;
1598                 case 12: /* bring specified console to the front */
1599                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1600                                 set_console(vc->vc_par[1] - 1);
1601                         break;
1602                 case 13: /* unblank the screen */
1603                         poke_blanked_console();
1604                         break;
1605                 case 14: /* set vesa powerdown interval */
1606                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1607                         break;
1608                 case 15: /* activate the previous console */
1609                         set_console(last_console);
1610                         break;
1611                 case 16: /* set cursor blink duration in msec */
1612                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1613                                         vc->vc_par[1] <= USHRT_MAX)
1614                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1615                         else
1616                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1617                         break;
1618         }
1619 }
1620
1621 /* console_lock is held */
1622 static void csi_at(struct vc_data *vc, unsigned int nr)
1623 {
1624         if (nr > vc->vc_cols - vc->vc_x)
1625                 nr = vc->vc_cols - vc->vc_x;
1626         else if (!nr)
1627                 nr = 1;
1628         insert_char(vc, nr);
1629 }
1630
1631 /* console_lock is held */
1632 static void csi_L(struct vc_data *vc, unsigned int nr)
1633 {
1634         if (nr > vc->vc_rows - vc->vc_y)
1635                 nr = vc->vc_rows - vc->vc_y;
1636         else if (!nr)
1637                 nr = 1;
1638         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1639         vc->vc_need_wrap = 0;
1640 }
1641
1642 /* console_lock is held */
1643 static void csi_P(struct vc_data *vc, unsigned int nr)
1644 {
1645         if (nr > vc->vc_cols - vc->vc_x)
1646                 nr = vc->vc_cols - vc->vc_x;
1647         else if (!nr)
1648                 nr = 1;
1649         delete_char(vc, nr);
1650 }
1651
1652 /* console_lock is held */
1653 static void csi_M(struct vc_data *vc, unsigned int nr)
1654 {
1655         if (nr > vc->vc_rows - vc->vc_y)
1656                 nr = vc->vc_rows - vc->vc_y;
1657         else if (!nr)
1658                 nr=1;
1659         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1660         vc->vc_need_wrap = 0;
1661 }
1662
1663 /* console_lock is held (except via vc_init->reset_terminal */
1664 static void save_cur(struct vc_data *vc)
1665 {
1666         vc->vc_saved_x          = vc->vc_x;
1667         vc->vc_saved_y          = vc->vc_y;
1668         vc->vc_s_intensity      = vc->vc_intensity;
1669         vc->vc_s_italic         = vc->vc_italic;
1670         vc->vc_s_underline      = vc->vc_underline;
1671         vc->vc_s_blink          = vc->vc_blink;
1672         vc->vc_s_reverse        = vc->vc_reverse;
1673         vc->vc_s_charset        = vc->vc_charset;
1674         vc->vc_s_color          = vc->vc_color;
1675         vc->vc_saved_G0         = vc->vc_G0_charset;
1676         vc->vc_saved_G1         = vc->vc_G1_charset;
1677 }
1678
1679 /* console_lock is held */
1680 static void restore_cur(struct vc_data *vc)
1681 {
1682         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1683         vc->vc_intensity        = vc->vc_s_intensity;
1684         vc->vc_italic           = vc->vc_s_italic;
1685         vc->vc_underline        = vc->vc_s_underline;
1686         vc->vc_blink            = vc->vc_s_blink;
1687         vc->vc_reverse          = vc->vc_s_reverse;
1688         vc->vc_charset          = vc->vc_s_charset;
1689         vc->vc_color            = vc->vc_s_color;
1690         vc->vc_G0_charset       = vc->vc_saved_G0;
1691         vc->vc_G1_charset       = vc->vc_saved_G1;
1692         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1693         update_attr(vc);
1694         vc->vc_need_wrap = 0;
1695 }
1696
1697 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1698         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1699         ESpalette, ESosc };
1700
1701 /* console_lock is held (except via vc_init()) */
1702 static void reset_terminal(struct vc_data *vc, int do_clear)
1703 {
1704         vc->vc_top              = 0;
1705         vc->vc_bottom           = vc->vc_rows;
1706         vc->vc_state            = ESnormal;
1707         vc->vc_ques             = 0;
1708         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1709         vc->vc_G0_charset       = LAT1_MAP;
1710         vc->vc_G1_charset       = GRAF_MAP;
1711         vc->vc_charset          = 0;
1712         vc->vc_need_wrap        = 0;
1713         vc->vc_report_mouse     = 0;
1714         vc->vc_utf              = default_utf8;
1715         vc->vc_utf_count        = 0;
1716
1717         vc->vc_disp_ctrl        = 0;
1718         vc->vc_toggle_meta      = 0;
1719
1720         vc->vc_decscnm          = 0;
1721         vc->vc_decom            = 0;
1722         vc->vc_decawm           = 1;
1723         vc->vc_deccm            = global_cursor_default;
1724         vc->vc_decim            = 0;
1725
1726         vt_reset_keyboard(vc->vc_num);
1727
1728         vc->vc_cursor_type = cur_default;
1729         vc->vc_complement_mask = vc->vc_s_complement_mask;
1730
1731         default_attr(vc);
1732         update_attr(vc);
1733
1734         vc->vc_tab_stop[0]      = 0x01010100;
1735         vc->vc_tab_stop[1]      =
1736         vc->vc_tab_stop[2]      =
1737         vc->vc_tab_stop[3]      =
1738         vc->vc_tab_stop[4]      =
1739         vc->vc_tab_stop[5]      =
1740         vc->vc_tab_stop[6]      =
1741         vc->vc_tab_stop[7]      = 0x01010101;
1742
1743         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1744         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1745         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1746
1747         gotoxy(vc, 0, 0);
1748         save_cur(vc);
1749         if (do_clear)
1750             csi_J(vc, 2);
1751 }
1752
1753 /* console_lock is held */
1754 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1755 {
1756         /*
1757          *  Control characters can be used in the _middle_
1758          *  of an escape sequence.
1759          */
1760         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1761                 return;
1762         switch (c) {
1763         case 0:
1764                 return;
1765         case 7:
1766                 if (vc->vc_state == ESosc)
1767                         vc->vc_state = ESnormal;
1768                 else if (vc->vc_bell_duration)
1769                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1770                 return;
1771         case 8:
1772                 bs(vc);
1773                 return;
1774         case 9:
1775                 vc->vc_pos -= (vc->vc_x << 1);
1776                 while (vc->vc_x < vc->vc_cols - 1) {
1777                         vc->vc_x++;
1778                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1779                                 break;
1780                 }
1781                 vc->vc_pos += (vc->vc_x << 1);
1782                 notify_write(vc, '\t');
1783                 return;
1784         case 10: case 11: case 12:
1785                 lf(vc);
1786                 if (!is_kbd(vc, lnm))
1787                         return;
1788         case 13:
1789                 cr(vc);
1790                 return;
1791         case 14:
1792                 vc->vc_charset = 1;
1793                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1794                 vc->vc_disp_ctrl = 1;
1795                 return;
1796         case 15:
1797                 vc->vc_charset = 0;
1798                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1799                 vc->vc_disp_ctrl = 0;
1800                 return;
1801         case 24: case 26:
1802                 vc->vc_state = ESnormal;
1803                 return;
1804         case 27:
1805                 vc->vc_state = ESesc;
1806                 return;
1807         case 127:
1808                 del(vc);
1809                 return;
1810         case 128+27:
1811                 vc->vc_state = ESsquare;
1812                 return;
1813         }
1814         switch(vc->vc_state) {
1815         case ESesc:
1816                 vc->vc_state = ESnormal;
1817                 switch (c) {
1818                 case '[':
1819                         vc->vc_state = ESsquare;
1820                         return;
1821                 case ']':
1822                         vc->vc_state = ESnonstd;
1823                         return;
1824                 case '%':
1825                         vc->vc_state = ESpercent;
1826                         return;
1827                 case 'E':
1828                         cr(vc);
1829                         lf(vc);
1830                         return;
1831                 case 'M':
1832                         ri(vc);
1833                         return;
1834                 case 'D':
1835                         lf(vc);
1836                         return;
1837                 case 'H':
1838                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1839                         return;
1840                 case 'Z':
1841                         respond_ID(tty);
1842                         return;
1843                 case '7':
1844                         save_cur(vc);
1845                         return;
1846                 case '8':
1847                         restore_cur(vc);
1848                         return;
1849                 case '(':
1850                         vc->vc_state = ESsetG0;
1851                         return;
1852                 case ')':
1853                         vc->vc_state = ESsetG1;
1854                         return;
1855                 case '#':
1856                         vc->vc_state = EShash;
1857                         return;
1858                 case 'c':
1859                         reset_terminal(vc, 1);
1860                         return;
1861                 case '>':  /* Numeric keypad */
1862                         clr_kbd(vc, kbdapplic);
1863                         return;
1864                 case '=':  /* Appl. keypad */
1865                         set_kbd(vc, kbdapplic);
1866                         return;
1867                 }
1868                 return;
1869         case ESnonstd:
1870                 if (c=='P') {   /* palette escape sequence */
1871                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1872                                 vc->vc_par[vc->vc_npar] = 0;
1873                         vc->vc_npar = 0;
1874                         vc->vc_state = ESpalette;
1875                         return;
1876                 } else if (c=='R') {   /* reset palette */
1877                         reset_palette(vc);
1878                         vc->vc_state = ESnormal;
1879                 } else if (c>='0' && c<='9')
1880                         vc->vc_state = ESosc;
1881                 else
1882                         vc->vc_state = ESnormal;
1883                 return;
1884         case ESpalette:
1885                 if (isxdigit(c)) {
1886                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1887                         if (vc->vc_npar == 7) {
1888                                 int i = vc->vc_par[0] * 3, j = 1;
1889                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1890                                 vc->vc_palette[i++] += vc->vc_par[j++];
1891                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1892                                 vc->vc_palette[i++] += vc->vc_par[j++];
1893                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1894                                 vc->vc_palette[i] += vc->vc_par[j];
1895                                 set_palette(vc);
1896                                 vc->vc_state = ESnormal;
1897                         }
1898                 } else
1899                         vc->vc_state = ESnormal;
1900                 return;
1901         case ESsquare:
1902                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1903                         vc->vc_par[vc->vc_npar] = 0;
1904                 vc->vc_npar = 0;
1905                 vc->vc_state = ESgetpars;
1906                 if (c == '[') { /* Function key */
1907                         vc->vc_state=ESfunckey;
1908                         return;
1909                 }
1910                 vc->vc_ques = (c == '?');
1911                 if (vc->vc_ques)
1912                         return;
1913         case ESgetpars:
1914                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1915                         vc->vc_npar++;
1916                         return;
1917                 } else if (c>='0' && c<='9') {
1918                         vc->vc_par[vc->vc_npar] *= 10;
1919                         vc->vc_par[vc->vc_npar] += c - '0';
1920                         return;
1921                 }
1922                 vc->vc_state = ESnormal;
1923                 switch(c) {
1924                 case 'h':
1925                         set_mode(vc, 1);
1926                         return;
1927                 case 'l':
1928                         set_mode(vc, 0);
1929                         return;
1930                 case 'c':
1931                         if (vc->vc_ques) {
1932                                 if (vc->vc_par[0])
1933                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1934                                 else
1935                                         vc->vc_cursor_type = cur_default;
1936                                 return;
1937                         }
1938                         break;
1939                 case 'm':
1940                         if (vc->vc_ques) {
1941                                 clear_selection();
1942                                 if (vc->vc_par[0])
1943                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1944                                 else
1945                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1946                                 return;
1947                         }
1948                         break;
1949                 case 'n':
1950                         if (!vc->vc_ques) {
1951                                 if (vc->vc_par[0] == 5)
1952                                         status_report(tty);
1953                                 else if (vc->vc_par[0] == 6)
1954                                         cursor_report(vc, tty);
1955                         }
1956                         return;
1957                 }
1958                 if (vc->vc_ques) {
1959                         vc->vc_ques = 0;
1960                         return;
1961                 }
1962                 switch(c) {
1963                 case 'G': case '`':
1964                         if (vc->vc_par[0])
1965                                 vc->vc_par[0]--;
1966                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1967                         return;
1968                 case 'A':
1969                         if (!vc->vc_par[0])
1970                                 vc->vc_par[0]++;
1971                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1972                         return;
1973                 case 'B': case 'e':
1974                         if (!vc->vc_par[0])
1975                                 vc->vc_par[0]++;
1976                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1977                         return;
1978                 case 'C': case 'a':
1979                         if (!vc->vc_par[0])
1980                                 vc->vc_par[0]++;
1981                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1982                         return;
1983                 case 'D':
1984                         if (!vc->vc_par[0])
1985                                 vc->vc_par[0]++;
1986                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1987                         return;
1988                 case 'E':
1989                         if (!vc->vc_par[0])
1990                                 vc->vc_par[0]++;
1991                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1992                         return;
1993                 case 'F':
1994                         if (!vc->vc_par[0])
1995                                 vc->vc_par[0]++;
1996                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1997                         return;
1998                 case 'd':
1999                         if (vc->vc_par[0])
2000                                 vc->vc_par[0]--;
2001                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2002                         return;
2003                 case 'H': case 'f':
2004                         if (vc->vc_par[0])
2005                                 vc->vc_par[0]--;
2006                         if (vc->vc_par[1])
2007                                 vc->vc_par[1]--;
2008                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2009                         return;
2010                 case 'J':
2011                         csi_J(vc, vc->vc_par[0]);
2012                         return;
2013                 case 'K':
2014                         csi_K(vc, vc->vc_par[0]);
2015                         return;
2016                 case 'L':
2017                         csi_L(vc, vc->vc_par[0]);
2018                         return;
2019                 case 'M':
2020                         csi_M(vc, vc->vc_par[0]);
2021                         return;
2022                 case 'P':
2023                         csi_P(vc, vc->vc_par[0]);
2024                         return;
2025                 case 'c':
2026                         if (!vc->vc_par[0])
2027                                 respond_ID(tty);
2028                         return;
2029                 case 'g':
2030                         if (!vc->vc_par[0])
2031                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2032                         else if (vc->vc_par[0] == 3) {
2033                                 vc->vc_tab_stop[0] =
2034                                         vc->vc_tab_stop[1] =
2035                                         vc->vc_tab_stop[2] =
2036                                         vc->vc_tab_stop[3] =
2037                                         vc->vc_tab_stop[4] =
2038                                         vc->vc_tab_stop[5] =
2039                                         vc->vc_tab_stop[6] =
2040                                         vc->vc_tab_stop[7] = 0;
2041                         }
2042                         return;
2043                 case 'm':
2044                         csi_m(vc);
2045                         return;
2046                 case 'q': /* DECLL - but only 3 leds */
2047                         /* map 0,1,2,3 to 0,1,2,4 */
2048                         if (vc->vc_par[0] < 4)
2049                                 vt_set_led_state(vc->vc_num,
2050                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2051                         return;
2052                 case 'r':
2053                         if (!vc->vc_par[0])
2054                                 vc->vc_par[0]++;
2055                         if (!vc->vc_par[1])
2056                                 vc->vc_par[1] = vc->vc_rows;
2057                         /* Minimum allowed region is 2 lines */
2058                         if (vc->vc_par[0] < vc->vc_par[1] &&
2059                             vc->vc_par[1] <= vc->vc_rows) {
2060                                 vc->vc_top = vc->vc_par[0] - 1;
2061                                 vc->vc_bottom = vc->vc_par[1];
2062                                 gotoxay(vc, 0, 0);
2063                         }
2064                         return;
2065                 case 's':
2066                         save_cur(vc);
2067                         return;
2068                 case 'u':
2069                         restore_cur(vc);
2070                         return;
2071                 case 'X':
2072                         csi_X(vc, vc->vc_par[0]);
2073                         return;
2074                 case '@':
2075                         csi_at(vc, vc->vc_par[0]);
2076                         return;
2077                 case ']': /* setterm functions */
2078                         setterm_command(vc);
2079                         return;
2080                 }
2081                 return;
2082         case ESpercent:
2083                 vc->vc_state = ESnormal;
2084                 switch (c) {
2085                 case '@':  /* defined in ISO 2022 */
2086                         vc->vc_utf = 0;
2087                         return;
2088                 case 'G':  /* prelim official escape code */
2089                 case '8':  /* retained for compatibility */
2090                         vc->vc_utf = 1;
2091                         return;
2092                 }
2093                 return;
2094         case ESfunckey:
2095                 vc->vc_state = ESnormal;
2096                 return;
2097         case EShash:
2098                 vc->vc_state = ESnormal;
2099                 if (c == '8') {
2100                         /* DEC screen alignment test. kludge :-) */
2101                         vc->vc_video_erase_char =
2102                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2103                         csi_J(vc, 2);
2104                         vc->vc_video_erase_char =
2105                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2106                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2107                 }
2108                 return;
2109         case ESsetG0:
2110                 if (c == '0')
2111                         vc->vc_G0_charset = GRAF_MAP;
2112                 else if (c == 'B')
2113                         vc->vc_G0_charset = LAT1_MAP;
2114                 else if (c == 'U')
2115                         vc->vc_G0_charset = IBMPC_MAP;
2116                 else if (c == 'K')
2117                         vc->vc_G0_charset = USER_MAP;
2118                 if (vc->vc_charset == 0)
2119                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2120                 vc->vc_state = ESnormal;
2121                 return;
2122         case ESsetG1:
2123                 if (c == '0')
2124                         vc->vc_G1_charset = GRAF_MAP;
2125                 else if (c == 'B')
2126                         vc->vc_G1_charset = LAT1_MAP;
2127                 else if (c == 'U')
2128                         vc->vc_G1_charset = IBMPC_MAP;
2129                 else if (c == 'K')
2130                         vc->vc_G1_charset = USER_MAP;
2131                 if (vc->vc_charset == 1)
2132                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2133                 vc->vc_state = ESnormal;
2134                 return;
2135         case ESosc:
2136                 return;
2137         default:
2138                 vc->vc_state = ESnormal;
2139         }
2140 }
2141
2142 /* is_double_width() is based on the wcwidth() implementation by
2143  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2144  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2145  */
2146 struct interval {
2147         uint32_t first;
2148         uint32_t last;
2149 };
2150
2151 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2152 {
2153         int min = 0;
2154         int mid;
2155
2156         if (ucs < table[0].first || ucs > table[max].last)
2157                 return 0;
2158         while (max >= min) {
2159                 mid = (min + max) / 2;
2160                 if (ucs > table[mid].last)
2161                         min = mid + 1;
2162                 else if (ucs < table[mid].first)
2163                         max = mid - 1;
2164                 else
2165                         return 1;
2166         }
2167         return 0;
2168 }
2169
2170 static int is_double_width(uint32_t ucs)
2171 {
2172         static const struct interval double_width[] = {
2173                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2174                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2175                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2176                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2177         };
2178         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2179 }
2180
2181 /* acquires console_lock */
2182 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2183 {
2184 #ifdef VT_BUF_VRAM_ONLY
2185 #define FLUSH do { } while(0);
2186 #else
2187 #define FLUSH if (draw_x >= 0) { \
2188         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2189         draw_x = -1; \
2190         }
2191 #endif
2192
2193         int c, tc, ok, n = 0, draw_x = -1;
2194         unsigned int currcons;
2195         unsigned long draw_from = 0, draw_to = 0;
2196         struct vc_data *vc;
2197         unsigned char vc_attr;
2198         struct vt_notifier_param param;
2199         uint8_t rescan;
2200         uint8_t inverse;
2201         uint8_t width;
2202         u16 himask, charmask;
2203
2204         if (in_interrupt())
2205                 return count;
2206
2207         might_sleep();
2208
2209         console_lock();
2210         vc = tty->driver_data;
2211         if (vc == NULL) {
2212                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2213                 console_unlock();
2214                 return 0;
2215         }
2216
2217         currcons = vc->vc_num;
2218         if (!vc_cons_allocated(currcons)) {
2219                 /* could this happen? */
2220                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2221                 console_unlock();
2222                 return 0;
2223         }
2224
2225         himask = vc->vc_hi_font_mask;
2226         charmask = himask ? 0x1ff : 0xff;
2227
2228         /* undraw cursor first */
2229         if (IS_FG(vc))
2230                 hide_cursor(vc);
2231
2232         param.vc = vc;
2233
2234         while (!tty->stopped && count) {
2235                 int orig = *buf;
2236                 c = orig;
2237                 buf++;
2238                 n++;
2239                 count--;
2240                 rescan = 0;
2241                 inverse = 0;
2242                 width = 1;
2243
2244                 /* Do no translation at all in control states */
2245                 if (vc->vc_state != ESnormal) {
2246                         tc = c;
2247                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2248                     /* Combine UTF-8 into Unicode in vc_utf_char.
2249                      * vc_utf_count is the number of continuation bytes still
2250                      * expected to arrive.
2251                      * vc_npar is the number of continuation bytes arrived so
2252                      * far
2253                      */
2254 rescan_last_byte:
2255                     if ((c & 0xc0) == 0x80) {
2256                         /* Continuation byte received */
2257                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2258                         if (vc->vc_utf_count) {
2259                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2260                             vc->vc_npar++;
2261                             if (--vc->vc_utf_count) {
2262                                 /* Still need some bytes */
2263                                 continue;
2264                             }
2265                             /* Got a whole character */
2266                             c = vc->vc_utf_char;
2267                             /* Reject overlong sequences */
2268                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2269                                         c > utf8_length_changes[vc->vc_npar])
2270                                 c = 0xfffd;
2271                         } else {
2272                             /* Unexpected continuation byte */
2273                             vc->vc_utf_count = 0;
2274                             c = 0xfffd;
2275                         }
2276                     } else {
2277                         /* Single ASCII byte or first byte of a sequence received */
2278                         if (vc->vc_utf_count) {
2279                             /* Continuation byte expected */
2280                             rescan = 1;
2281                             vc->vc_utf_count = 0;
2282                             c = 0xfffd;
2283                         } else if (c > 0x7f) {
2284                             /* First byte of a multibyte sequence received */
2285                             vc->vc_npar = 0;
2286                             if ((c & 0xe0) == 0xc0) {
2287                                 vc->vc_utf_count = 1;
2288                                 vc->vc_utf_char = (c & 0x1f);
2289                             } else if ((c & 0xf0) == 0xe0) {
2290                                 vc->vc_utf_count = 2;
2291                                 vc->vc_utf_char = (c & 0x0f);
2292                             } else if ((c & 0xf8) == 0xf0) {
2293                                 vc->vc_utf_count = 3;
2294                                 vc->vc_utf_char = (c & 0x07);
2295                             } else if ((c & 0xfc) == 0xf8) {
2296                                 vc->vc_utf_count = 4;
2297                                 vc->vc_utf_char = (c & 0x03);
2298                             } else if ((c & 0xfe) == 0xfc) {
2299                                 vc->vc_utf_count = 5;
2300                                 vc->vc_utf_char = (c & 0x01);
2301                             } else {
2302                                 /* 254 and 255 are invalid */
2303                                 c = 0xfffd;
2304                             }
2305                             if (vc->vc_utf_count) {
2306                                 /* Still need some bytes */
2307                                 continue;
2308                             }
2309                         }
2310                         /* Nothing to do if an ASCII byte was received */
2311                     }
2312                     /* End of UTF-8 decoding. */
2313                     /* c is the received character, or U+FFFD for invalid sequences. */
2314                     /* Replace invalid Unicode code points with U+FFFD too */
2315                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2316                         c = 0xfffd;
2317                     tc = c;
2318                 } else {        /* no utf or alternate charset mode */
2319                     tc = vc_translate(vc, c);
2320                 }
2321
2322                 param.c = tc;
2323                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2324                                         &param) == NOTIFY_STOP)
2325                         continue;
2326
2327                 /* If the original code was a control character we
2328                  * only allow a glyph to be displayed if the code is
2329                  * not normally used (such as for cursor movement) or
2330                  * if the disp_ctrl mode has been explicitly enabled.
2331                  * Certain characters (as given by the CTRL_ALWAYS
2332                  * bitmap) are always displayed as control characters,
2333                  * as the console would be pretty useless without
2334                  * them; to display an arbitrary font position use the
2335                  * direct-to-font zone in UTF-8 mode.
2336                  */
2337                 ok = tc && (c >= 32 ||
2338                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2339                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2340                         && (c != 127 || vc->vc_disp_ctrl)
2341                         && (c != 128+27);
2342
2343                 if (vc->vc_state == ESnormal && ok) {
2344                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2345                                 if (is_double_width(c))
2346                                         width = 2;
2347                         }
2348                         /* Now try to find out how to display it */
2349                         tc = conv_uni_to_pc(vc, tc);
2350                         if (tc & ~charmask) {
2351                                 if (tc == -1 || tc == -2) {
2352                                     continue; /* nothing to display */
2353                                 }
2354                                 /* Glyph not found */
2355                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2356                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2357                                        This would make absolutely no sense with Unicode in mind,
2358                                        but do this for ASCII characters since a font may lack
2359                                        Unicode mapping info and we don't want to end up with
2360                                        having question marks only. */
2361                                     tc = c;
2362                                 } else {
2363                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2364                                     tc = conv_uni_to_pc(vc, 0xfffd);
2365                                     if (tc < 0) {
2366                                         inverse = 1;
2367                                         tc = conv_uni_to_pc(vc, '?');
2368                                         if (tc < 0) tc = '?';
2369                                     }
2370                                 }
2371                         }
2372
2373                         if (!inverse) {
2374                                 vc_attr = vc->vc_attr;
2375                         } else {
2376                                 /* invert vc_attr */
2377                                 if (!vc->vc_can_do_color) {
2378                                         vc_attr = (vc->vc_attr) ^ 0x08;
2379                                 } else if (vc->vc_hi_font_mask == 0x100) {
2380                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2381                                 } else {
2382                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2383                                 }
2384                                 FLUSH
2385                         }
2386
2387                         while (1) {
2388                                 if (vc->vc_need_wrap || vc->vc_decim)
2389                                         FLUSH
2390                                 if (vc->vc_need_wrap) {
2391                                         cr(vc);
2392                                         lf(vc);
2393                                 }
2394                                 if (vc->vc_decim)
2395                                         insert_char(vc, 1);
2396                                 scr_writew(himask ?
2397                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2398                                              (vc_attr << 8) + tc,
2399                                            (u16 *) vc->vc_pos);
2400                                 if (DO_UPDATE(vc) && draw_x < 0) {
2401                                         draw_x = vc->vc_x;
2402                                         draw_from = vc->vc_pos;
2403                                 }
2404                                 if (vc->vc_x == vc->vc_cols - 1) {
2405                                         vc->vc_need_wrap = vc->vc_decawm;
2406                                         draw_to = vc->vc_pos + 2;
2407                                 } else {
2408                                         vc->vc_x++;
2409                                         draw_to = (vc->vc_pos += 2);
2410                                 }
2411
2412                                 if (!--width) break;
2413
2414                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2415                                 if (tc < 0) tc = ' ';
2416                         }
2417                         notify_write(vc, c);
2418
2419                         if (inverse) {
2420                                 FLUSH
2421                         }
2422
2423                         if (rescan) {
2424                                 rescan = 0;
2425                                 inverse = 0;
2426                                 width = 1;
2427                                 c = orig;
2428                                 goto rescan_last_byte;
2429                         }
2430                         continue;
2431                 }
2432                 FLUSH
2433                 do_con_trol(tty, vc, orig);
2434         }
2435         FLUSH
2436         console_conditional_schedule();
2437         console_unlock();
2438         notify_update(vc);
2439         return n;
2440 #undef FLUSH
2441 }
2442
2443 /*
2444  * This is the console switching callback.
2445  *
2446  * Doing console switching in a process context allows
2447  * us to do the switches asynchronously (needed when we want
2448  * to switch due to a keyboard interrupt).  Synchronization
2449  * with other console code and prevention of re-entrancy is
2450  * ensured with console_lock.
2451  */
2452 static void console_callback(struct work_struct *ignored)
2453 {
2454         console_lock();
2455
2456         if (want_console >= 0) {
2457                 if (want_console != fg_console &&
2458                     vc_cons_allocated(want_console)) {
2459                         hide_cursor(vc_cons[fg_console].d);
2460                         change_console(vc_cons[want_console].d);
2461                         /* we only changed when the console had already
2462                            been allocated - a new console is not created
2463                            in an interrupt routine */
2464                 }
2465                 want_console = -1;
2466         }
2467         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2468                 do_poke_blanked_console = 0;
2469                 poke_blanked_console();
2470         }
2471         if (scrollback_delta) {
2472                 struct vc_data *vc = vc_cons[fg_console].d;
2473                 clear_selection();
2474                 if (vc->vc_mode == KD_TEXT)
2475                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2476                 scrollback_delta = 0;
2477         }
2478         if (blank_timer_expired) {
2479                 do_blank_screen(0);
2480                 blank_timer_expired = 0;
2481         }
2482         notify_update(vc_cons[fg_console].d);
2483
2484         console_unlock();
2485 }
2486
2487 int set_console(int nr)
2488 {
2489         struct vc_data *vc = vc_cons[fg_console].d;
2490
2491         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2492                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2493
2494                 /*
2495                  * Console switch will fail in console_callback() or
2496                  * change_console() so there is no point scheduling
2497                  * the callback
2498                  *
2499                  * Existing set_console() users don't check the return
2500                  * value so this shouldn't break anything
2501                  */
2502                 return -EINVAL;
2503         }
2504
2505         want_console = nr;
2506         schedule_console_callback();
2507
2508         return 0;
2509 }
2510
2511 struct tty_driver *console_driver;
2512
2513 #ifdef CONFIG_VT_CONSOLE
2514
2515 /**
2516  * vt_kmsg_redirect() - Sets/gets the kernel message console
2517  * @new:        The new virtual terminal number or -1 if the console should stay
2518  *              unchanged
2519  *
2520  * By default, the kernel messages are always printed on the current virtual
2521  * console. However, the user may modify that default with the
2522  * TIOCL_SETKMSGREDIRECT ioctl call.
2523  *
2524  * This function sets the kernel message console to be @new. It returns the old
2525  * virtual console number. The virtual terminal number 0 (both as parameter and
2526  * return value) means no redirection (i.e. always printed on the currently
2527  * active console).
2528  *
2529  * The parameter -1 means that only the current console is returned, but the
2530  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2531  * case to make the code more understandable.
2532  *
2533  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2534  * the parameter and always returns 0.
2535  */
2536 int vt_kmsg_redirect(int new)
2537 {
2538         static int kmsg_con;
2539
2540         if (new != -1)
2541                 return xchg(&kmsg_con, new);
2542         else
2543                 return kmsg_con;
2544 }
2545
2546 /*
2547  *      Console on virtual terminal
2548  *
2549  * The console must be locked when we get here.
2550  */
2551
2552 static void vt_console_print(struct console *co, const char *b, unsigned count)
2553 {
2554         struct vc_data *vc = vc_cons[fg_console].d;
2555         unsigned char c;
2556         static DEFINE_SPINLOCK(printing_lock);
2557         const ushort *start;
2558         ushort cnt = 0;
2559         ushort myx;
2560         int kmsg_console;
2561
2562         /* console busy or not yet initialized */
2563         if (!printable)
2564                 return;
2565         if (!spin_trylock(&printing_lock))
2566                 return;
2567
2568         kmsg_console = vt_get_kmsg_redirect();
2569         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2570                 vc = vc_cons[kmsg_console - 1].d;
2571
2572         /* read `x' only after setting currcons properly (otherwise
2573            the `x' macro will read the x of the foreground console). */
2574         myx = vc->vc_x;
2575
2576         if (!vc_cons_allocated(fg_console)) {
2577                 /* impossible */
2578                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2579                 goto quit;
2580         }
2581
2582         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2583                 goto quit;
2584
2585         /* undraw cursor first */
2586         if (IS_FG(vc))
2587                 hide_cursor(vc);
2588
2589         start = (ushort *)vc->vc_pos;
2590
2591         /* Contrived structure to try to emulate original need_wrap behaviour
2592          * Problems caused when we have need_wrap set on '\n' character */
2593         while (count--) {
2594                 c = *b++;
2595                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2596                         if (cnt > 0) {
2597                                 if (CON_IS_VISIBLE(vc))
2598                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2599                                 vc->vc_x += cnt;
2600                                 if (vc->vc_need_wrap)
2601                                         vc->vc_x--;
2602                                 cnt = 0;
2603                         }
2604                         if (c == 8) {           /* backspace */
2605                                 bs(vc);
2606                                 start = (ushort *)vc->vc_pos;
2607                                 myx = vc->vc_x;
2608                                 continue;
2609                         }
2610                         if (c != 13)
2611                                 lf(vc);
2612                         cr(vc);
2613                         start = (ushort *)vc->vc_pos;
2614                         myx = vc->vc_x;
2615                         if (c == 10 || c == 13)
2616                                 continue;
2617                 }
2618                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2619                 notify_write(vc, c);
2620                 cnt++;
2621                 if (myx == vc->vc_cols - 1) {
2622                         vc->vc_need_wrap = 1;
2623                         continue;
2624                 }
2625                 vc->vc_pos += 2;
2626                 myx++;
2627         }
2628         if (cnt > 0) {
2629                 if (CON_IS_VISIBLE(vc))
2630                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2631                 vc->vc_x += cnt;
2632                 if (vc->vc_x == vc->vc_cols) {
2633                         vc->vc_x--;
2634                         vc->vc_need_wrap = 1;
2635                 }
2636         }
2637         set_cursor(vc);
2638         notify_update(vc);
2639
2640 quit:
2641         spin_unlock(&printing_lock);
2642 }
2643
2644 static struct tty_driver *vt_console_device(struct console *c, int *index)
2645 {
2646         *index = c->index ? c->index-1 : fg_console;
2647         return console_driver;
2648 }
2649
2650 static struct console vt_console_driver = {
2651         .name           = "tty",
2652         .write          = vt_console_print,
2653         .device         = vt_console_device,
2654         .unblank        = unblank_screen,
2655         .flags          = CON_PRINTBUFFER,
2656         .index          = -1,
2657 };
2658 #endif
2659
2660 /*
2661  *      Handling of Linux-specific VC ioctls
2662  */
2663
2664 /*
2665  * Generally a bit racy with respect to console_lock();.
2666  *
2667  * There are some functions which don't need it.
2668  *
2669  * There are some functions which can sleep for arbitrary periods
2670  * (paste_selection) but we don't need the lock there anyway.
2671  *
2672  * set_selection has locking, and definitely needs it
2673  */
2674
2675 int tioclinux(struct tty_struct *tty, unsigned long arg)
2676 {
2677         char type, data;
2678         char __user *p = (char __user *)arg;
2679         int lines;
2680         int ret;
2681
2682         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2683                 return -EPERM;
2684         if (get_user(type, p))
2685                 return -EFAULT;
2686         ret = 0;
2687
2688         switch (type)
2689         {
2690                 case TIOCL_SETSEL:
2691                         console_lock();
2692                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2693                         console_unlock();
2694                         break;
2695                 case TIOCL_PASTESEL:
2696                         ret = paste_selection(tty);
2697                         break;
2698                 case TIOCL_UNBLANKSCREEN:
2699                         console_lock();
2700                         unblank_screen();
2701                         console_unlock();
2702                         break;
2703                 case TIOCL_SELLOADLUT:
2704                         console_lock();
2705                         ret = sel_loadlut(p);
2706                         console_unlock();
2707                         break;
2708                 case TIOCL_GETSHIFTSTATE:
2709
2710         /*
2711          * Make it possible to react to Shift+Mousebutton.
2712          * Note that 'shift_state' is an undocumented
2713          * kernel-internal variable; programs not closely
2714          * related to the kernel should not use this.
2715          */
2716                         data = vt_get_shift_state();
2717                         ret = __put_user(data, p);
2718                         break;
2719                 case TIOCL_GETMOUSEREPORTING:
2720                         console_lock(); /* May be overkill */
2721                         data = mouse_reporting();
2722                         console_unlock();
2723                         ret = __put_user(data, p);
2724                         break;
2725                 case TIOCL_SETVESABLANK:
2726                         console_lock();
2727                         ret = set_vesa_blanking(p);
2728                         console_unlock();
2729                         break;
2730                 case TIOCL_GETKMSGREDIRECT:
2731                         data = vt_get_kmsg_redirect();
2732                         ret = __put_user(data, p);
2733                         break;
2734                 case TIOCL_SETKMSGREDIRECT:
2735                         if (!capable(CAP_SYS_ADMIN)) {
2736                                 ret = -EPERM;
2737                         } else {
2738                                 if (get_user(data, p+1))
2739                                         ret = -EFAULT;
2740                                 else
2741                                         vt_kmsg_redirect(data);
2742                         }
2743                         break;
2744                 case TIOCL_GETFGCONSOLE:
2745                         /* No locking needed as this is a transiently
2746                            correct return anyway if the caller hasn't
2747                            disabled switching */
2748                         ret = fg_console;
2749                         break;
2750                 case TIOCL_SCROLLCONSOLE:
2751                         if (get_user(lines, (s32 __user *)(p+4))) {
2752                                 ret = -EFAULT;
2753                         } else {
2754                                 /* Need the console lock here. Note that lots
2755                                    of other calls need fixing before the lock
2756                                    is actually useful ! */
2757                                 console_lock();
2758                                 scrollfront(vc_cons[fg_console].d, lines);
2759                                 console_unlock();
2760                                 ret = 0;
2761                         }
2762                         break;
2763                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2764                         console_lock();
2765                         ignore_poke = 1;
2766                         do_blank_screen(0);
2767                         console_unlock();
2768                         break;
2769                 case TIOCL_BLANKEDSCREEN:
2770                         ret = console_blanked;
2771                         break;
2772                 default:
2773                         ret = -EINVAL;
2774                         break;
2775         }
2776         return ret;
2777 }
2778
2779 /*
2780  * /dev/ttyN handling
2781  */
2782
2783 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2784 {
2785         int     retval;
2786
2787         retval = do_con_write(tty, buf, count);
2788         con_flush_chars(tty);
2789
2790         return retval;
2791 }
2792
2793 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2794 {
2795         if (in_interrupt())
2796                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2797         return do_con_write(tty, &ch, 1);
2798 }
2799
2800 static int con_write_room(struct tty_struct *tty)
2801 {
2802         if (tty->stopped)
2803                 return 0;
2804         return 32768;           /* No limit, really; we're not buffering */
2805 }
2806
2807 static int con_chars_in_buffer(struct tty_struct *tty)
2808 {
2809         return 0;               /* we're not buffering */
2810 }
2811
2812 /*
2813  * con_throttle and con_unthrottle are only used for
2814  * paste_selection(), which has to stuff in a large number of
2815  * characters...
2816  */
2817 static void con_throttle(struct tty_struct *tty)
2818 {
2819 }
2820
2821 static void con_unthrottle(struct tty_struct *tty)
2822 {
2823         struct vc_data *vc = tty->driver_data;
2824
2825         wake_up_interruptible(&vc->paste_wait);
2826 }
2827
2828 /*
2829  * Turn the Scroll-Lock LED on when the tty is stopped
2830  */
2831 static void con_stop(struct tty_struct *tty)
2832 {
2833         int console_num;
2834         if (!tty)
2835                 return;
2836         console_num = tty->index;
2837         if (!vc_cons_allocated(console_num))
2838                 return;
2839         vt_kbd_con_stop(console_num);
2840 }
2841
2842 /*
2843  * Turn the Scroll-Lock LED off when the console is started
2844  */
2845 static void con_start(struct tty_struct *tty)
2846 {
2847         int console_num;
2848         if (!tty)
2849                 return;
2850         console_num = tty->index;
2851         if (!vc_cons_allocated(console_num))
2852                 return;
2853         vt_kbd_con_start(console_num);
2854 }
2855
2856 static void con_flush_chars(struct tty_struct *tty)
2857 {
2858         struct vc_data *vc;
2859
2860         if (in_interrupt())     /* from flush_to_ldisc */
2861                 return;
2862
2863         /* if we race with con_close(), vt may be null */
2864         console_lock();
2865         vc = tty->driver_data;
2866         if (vc)
2867                 set_cursor(vc);
2868         console_unlock();
2869 }
2870
2871 /*
2872  * Allocate the console screen memory.
2873  */
2874 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2875 {
2876         unsigned int currcons = tty->index;
2877         struct vc_data *vc;
2878         int ret;
2879
2880         console_lock();
2881         ret = vc_allocate(currcons);
2882         if (ret)
2883                 goto unlock;
2884
2885         vc = vc_cons[currcons].d;
2886
2887         /* Still being freed */
2888         if (vc->port.tty) {
2889                 ret = -ERESTARTSYS;
2890                 goto unlock;
2891         }
2892
2893         ret = tty_port_install(&vc->port, driver, tty);
2894         if (ret)
2895                 goto unlock;
2896
2897         tty->driver_data = vc;
2898         vc->port.tty = tty;
2899
2900         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2901                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2902                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2903         }
2904         if (vc->vc_utf)
2905                 tty->termios.c_iflag |= IUTF8;
2906         else
2907                 tty->termios.c_iflag &= ~IUTF8;
2908 unlock:
2909         console_unlock();
2910         return ret;
2911 }
2912
2913 static int con_open(struct tty_struct *tty, struct file *filp)
2914 {
2915         /* everything done in install */
2916         return 0;
2917 }
2918
2919
2920 static void con_close(struct tty_struct *tty, struct file *filp)
2921 {
2922         /* Nothing to do - we defer to shutdown */
2923 }
2924
2925 static void con_shutdown(struct tty_struct *tty)
2926 {
2927         struct vc_data *vc = tty->driver_data;
2928         BUG_ON(vc == NULL);
2929         console_lock();
2930         vc->port.tty = NULL;
2931         console_unlock();
2932 }
2933
2934 static int default_color           = 7; /* white */
2935 static int default_italic_color    = 2; // green (ASCII)
2936 static int default_underline_color = 3; // cyan (ASCII)
2937 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2938 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2939 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2940
2941 static void vc_init(struct vc_data *vc, unsigned int rows,
2942                     unsigned int cols, int do_clear)
2943 {
2944         int j, k ;
2945
2946         vc->vc_cols = cols;
2947         vc->vc_rows = rows;
2948         vc->vc_size_row = cols << 1;
2949         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2950
2951         set_origin(vc);
2952         vc->vc_pos = vc->vc_origin;
2953         reset_vc(vc);
2954         for (j=k=0; j<16; j++) {
2955                 vc->vc_palette[k++] = default_red[j] ;
2956                 vc->vc_palette[k++] = default_grn[j] ;
2957                 vc->vc_palette[k++] = default_blu[j] ;
2958         }
2959         vc->vc_def_color       = default_color;
2960         vc->vc_ulcolor         = default_underline_color;
2961         vc->vc_itcolor         = default_italic_color;
2962         vc->vc_halfcolor       = 0x08;   /* grey */
2963         init_waitqueue_head(&vc->paste_wait);
2964         reset_terminal(vc, do_clear);
2965 }
2966
2967 /*
2968  * This routine initializes console interrupts, and does nothing
2969  * else. If you want the screen to clear, call tty_write with
2970  * the appropriate escape-sequence.
2971  */
2972
2973 static int __init con_init(void)
2974 {
2975         const char *display_desc = NULL;
2976         struct vc_data *vc;
2977         unsigned int currcons = 0, i;
2978
2979         console_lock();
2980
2981         if (conswitchp)
2982                 display_desc = conswitchp->con_startup();
2983         if (!display_desc) {
2984                 fg_console = 0;
2985                 console_unlock();
2986                 return 0;
2987         }
2988
2989         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2990                 struct con_driver *con_driver = &registered_con_driver[i];
2991
2992                 if (con_driver->con == NULL) {
2993                         con_driver->con = conswitchp;
2994                         con_driver->desc = display_desc;
2995                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2996                         con_driver->first = 0;
2997                         con_driver->last = MAX_NR_CONSOLES - 1;
2998                         break;
2999                 }
3000         }
3001
3002         for (i = 0; i < MAX_NR_CONSOLES; i++)
3003                 con_driver_map[i] = conswitchp;
3004
3005         if (blankinterval) {
3006                 blank_state = blank_normal_wait;
3007                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3008         }
3009
3010         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3011                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3012                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3013                 tty_port_init(&vc->port);
3014                 visual_init(vc, currcons, 1);
3015                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3016                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3017                         currcons || !vc->vc_sw->con_save_screen);
3018         }
3019         currcons = fg_console = 0;
3020         master_display_fg = vc = vc_cons[currcons].d;
3021         set_origin(vc);
3022         save_screen(vc);
3023         gotoxy(vc, vc->vc_x, vc->vc_y);
3024         csi_J(vc, 0);
3025         update_screen(vc);
3026         pr_info("Console: %s %s %dx%d\n",
3027                 vc->vc_can_do_color ? "colour" : "mono",
3028                 display_desc, vc->vc_cols, vc->vc_rows);
3029         printable = 1;
3030
3031         console_unlock();
3032
3033 #ifdef CONFIG_VT_CONSOLE
3034         register_console(&vt_console_driver);
3035 #endif
3036         return 0;
3037 }
3038 console_initcall(con_init);
3039
3040 static const struct tty_operations con_ops = {
3041         .install = con_install,
3042         .open = con_open,
3043         .close = con_close,
3044         .write = con_write,
3045         .write_room = con_write_room,
3046         .put_char = con_put_char,
3047         .flush_chars = con_flush_chars,
3048         .chars_in_buffer = con_chars_in_buffer,
3049         .ioctl = vt_ioctl,
3050 #ifdef CONFIG_COMPAT
3051         .compat_ioctl = vt_compat_ioctl,
3052 #endif
3053         .stop = con_stop,
3054         .start = con_start,
3055         .throttle = con_throttle,
3056         .unthrottle = con_unthrottle,
3057         .resize = vt_resize,
3058         .shutdown = con_shutdown
3059 };
3060
3061 static struct cdev vc0_cdev;
3062
3063 static ssize_t show_tty_active(struct device *dev,
3064                                 struct device_attribute *attr, char *buf)
3065 {
3066         return sprintf(buf, "tty%d\n", fg_console + 1);
3067 }
3068 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3069
3070 static struct attribute *vt_dev_attrs[] = {
3071         &dev_attr_active.attr,
3072         NULL
3073 };
3074
3075 ATTRIBUTE_GROUPS(vt_dev);
3076
3077 int __init vty_init(const struct file_operations *console_fops)
3078 {
3079         cdev_init(&vc0_cdev, console_fops);
3080         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3081             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3082                 panic("Couldn't register /dev/tty0 driver\n");
3083         tty0dev = device_create_with_groups(tty_class, NULL,
3084                                             MKDEV(TTY_MAJOR, 0), NULL,
3085                                             vt_dev_groups, "tty0");
3086         if (IS_ERR(tty0dev))
3087                 tty0dev = NULL;
3088
3089         vcs_init();
3090
3091         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3092         if (!console_driver)
3093                 panic("Couldn't allocate console driver\n");
3094
3095         console_driver->name = "tty";
3096         console_driver->name_base = 1;
3097         console_driver->major = TTY_MAJOR;
3098         console_driver->minor_start = 1;
3099         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3100         console_driver->init_termios = tty_std_termios;
3101         if (default_utf8)
3102                 console_driver->init_termios.c_iflag |= IUTF8;
3103         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3104         tty_set_operations(console_driver, &con_ops);
3105         if (tty_register_driver(console_driver))
3106                 panic("Couldn't register console driver\n");
3107         kbd_init();
3108         console_map_init();
3109 #ifdef CONFIG_MDA_CONSOLE
3110         mda_console_init();
3111 #endif
3112         return 0;
3113 }
3114
3115 #ifndef VT_SINGLE_DRIVER
3116
3117 static struct class *vtconsole_class;
3118
3119 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3120                            int deflt)
3121 {
3122         struct module *owner = csw->owner;
3123         const char *desc = NULL;
3124         struct con_driver *con_driver;
3125         int i, j = -1, k = -1, retval = -ENODEV;
3126
3127         if (!try_module_get(owner))
3128                 return -ENODEV;
3129
3130         WARN_CONSOLE_UNLOCKED();
3131
3132         /* check if driver is registered */
3133         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3134                 con_driver = &registered_con_driver[i];
3135
3136                 if (con_driver->con == csw) {
3137                         desc = con_driver->desc;
3138                         retval = 0;
3139                         break;
3140                 }
3141         }
3142
3143         if (retval)
3144                 goto err;
3145
3146         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3147                 csw->con_startup();
3148                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3149         }
3150
3151         if (deflt) {
3152                 if (conswitchp)
3153                         module_put(conswitchp->owner);
3154
3155                 __module_get(owner);
3156                 conswitchp = csw;
3157         }
3158
3159         first = max(first, con_driver->first);
3160         last = min(last, con_driver->last);
3161
3162         for (i = first; i <= last; i++) {
3163                 int old_was_color;
3164                 struct vc_data *vc = vc_cons[i].d;
3165
3166                 if (con_driver_map[i])
3167                         module_put(con_driver_map[i]->owner);
3168                 __module_get(owner);
3169                 con_driver_map[i] = csw;
3170
3171                 if (!vc || !vc->vc_sw)
3172                         continue;
3173
3174                 j = i;
3175
3176                 if (CON_IS_VISIBLE(vc)) {
3177                         k = i;
3178                         save_screen(vc);
3179                 }
3180
3181                 old_was_color = vc->vc_can_do_color;
3182                 vc->vc_sw->con_deinit(vc);
3183                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3184                 visual_init(vc, i, 0);
3185                 set_origin(vc);
3186                 update_attr(vc);
3187
3188                 /* If the console changed between mono <-> color, then
3189                  * the attributes in the screenbuf will be wrong.  The
3190                  * following resets all attributes to something sane.
3191                  */
3192                 if (old_was_color != vc->vc_can_do_color)
3193                         clear_buffer_attributes(vc);
3194         }
3195
3196         pr_info("Console: switching ");
3197         if (!deflt)
3198                 printk("consoles %d-%d ", first+1, last+1);
3199         if (j >= 0) {
3200                 struct vc_data *vc = vc_cons[j].d;
3201
3202                 printk("to %s %s %dx%d\n",
3203                        vc->vc_can_do_color ? "colour" : "mono",
3204                        desc, vc->vc_cols, vc->vc_rows);
3205
3206                 if (k >= 0) {
3207                         vc = vc_cons[k].d;
3208                         update_screen(vc);
3209                 }
3210         } else
3211                 printk("to %s\n", desc);
3212
3213         retval = 0;
3214 err:
3215         module_put(owner);
3216         return retval;
3217 };
3218
3219
3220 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3221 /* unlocked version of unbind_con_driver() */
3222 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3223 {
3224         struct module *owner = csw->owner;
3225         const struct consw *defcsw = NULL;
3226         struct con_driver *con_driver = NULL, *con_back = NULL;
3227         int i, retval = -ENODEV;
3228
3229         if (!try_module_get(owner))
3230                 return -ENODEV;
3231
3232         WARN_CONSOLE_UNLOCKED();
3233
3234         /* check if driver is registered and if it is unbindable */
3235         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3236                 con_driver = &registered_con_driver[i];
3237
3238                 if (con_driver->con == csw &&
3239                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3240                         retval = 0;
3241                         break;
3242                 }
3243         }
3244
3245         if (retval)
3246                 goto err;
3247
3248         retval = -ENODEV;
3249
3250         /* check if backup driver exists */
3251         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3252                 con_back = &registered_con_driver[i];
3253
3254                 if (con_back->con && con_back->con != csw) {
3255                         defcsw = con_back->con;
3256                         retval = 0;
3257                         break;
3258                 }
3259         }
3260
3261         if (retval)
3262                 goto err;
3263
3264         if (!con_is_bound(csw))
3265                 goto err;
3266
3267         first = max(first, con_driver->first);
3268         last = min(last, con_driver->last);
3269
3270         for (i = first; i <= last; i++) {
3271                 if (con_driver_map[i] == csw) {
3272                         module_put(csw->owner);
3273                         con_driver_map[i] = NULL;
3274                 }
3275         }
3276
3277         if (!con_is_bound(defcsw)) {
3278                 const struct consw *defconsw = conswitchp;
3279
3280                 defcsw->con_startup();
3281                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3282                 /*
3283                  * vgacon may change the default driver to point
3284                  * to dummycon, we restore it here...
3285                  */
3286                 conswitchp = defconsw;
3287         }
3288
3289         if (!con_is_bound(csw))
3290                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3291
3292         /* ignore return value, binding should not fail */
3293         do_bind_con_driver(defcsw, first, last, deflt);
3294 err:
3295         module_put(owner);
3296         return retval;
3297
3298 }
3299 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3300
3301 static int vt_bind(struct con_driver *con)
3302 {
3303         const struct consw *defcsw = NULL, *csw = NULL;
3304         int i, more = 1, first = -1, last = -1, deflt = 0;
3305
3306         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3307                 goto err;
3308
3309         csw = con->con;
3310
3311         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3312                 struct con_driver *con = &registered_con_driver[i];
3313
3314                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3315                         defcsw = con->con;
3316                         break;
3317                 }
3318         }
3319
3320         if (!defcsw)
3321                 goto err;
3322
3323         while (more) {
3324                 more = 0;
3325
3326                 for (i = con->first; i <= con->last; i++) {
3327                         if (con_driver_map[i] == defcsw) {
3328                                 if (first == -1)
3329                                         first = i;
3330                                 last = i;
3331                                 more = 1;
3332                         } else if (first != -1)
3333                                 break;
3334                 }
3335
3336                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3337                         deflt = 1;
3338
3339                 if (first != -1)
3340                         do_bind_con_driver(csw, first, last, deflt);
3341
3342                 first = -1;
3343                 last = -1;
3344                 deflt = 0;
3345         }
3346
3347 err:
3348         return 0;
3349 }
3350
3351 static int vt_unbind(struct con_driver *con)
3352 {
3353         const struct consw *csw = NULL;
3354         int i, more = 1, first = -1, last = -1, deflt = 0;
3355         int ret;
3356
3357         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3358                 goto err;
3359
3360         csw = con->con;
3361
3362         while (more) {
3363                 more = 0;
3364
3365                 for (i = con->first; i <= con->last; i++) {
3366                         if (con_driver_map[i] == csw) {
3367                                 if (first == -1)
3368                                         first = i;
3369                                 last = i;
3370                                 more = 1;
3371                         } else if (first != -1)
3372                                 break;
3373                 }
3374
3375                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3376                         deflt = 1;
3377
3378                 if (first != -1) {
3379                         ret = do_unbind_con_driver(csw, first, last, deflt);
3380                         if (ret != 0)
3381                                 return ret;
3382                 }
3383
3384                 first = -1;
3385                 last = -1;
3386                 deflt = 0;
3387         }
3388
3389 err:
3390         return 0;
3391 }
3392 #else
3393 static inline int vt_bind(struct con_driver *con)
3394 {
3395         return 0;
3396 }
3397 static inline int vt_unbind(struct con_driver *con)
3398 {
3399         return 0;
3400 }
3401 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3402
3403 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3404                           const char *buf, size_t count)
3405 {
3406         struct con_driver *con = dev_get_drvdata(dev);
3407         int bind = simple_strtoul(buf, NULL, 0);
3408
3409         console_lock();
3410
3411         if (bind)
3412                 vt_bind(con);
3413         else
3414                 vt_unbind(con);
3415
3416         console_unlock();
3417
3418         return count;
3419 }
3420
3421 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3422                          char *buf)
3423 {
3424         struct con_driver *con = dev_get_drvdata(dev);
3425         int bind = con_is_bound(con->con);
3426
3427         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3428 }
3429
3430 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3431                          char *buf)
3432 {
3433         struct con_driver *con = dev_get_drvdata(dev);
3434
3435         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3436                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3437                          con->desc);
3438
3439 }
3440
3441 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3442 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3443
3444 static struct attribute *con_dev_attrs[] = {
3445         &dev_attr_bind.attr,
3446         &dev_attr_name.attr,
3447         NULL
3448 };
3449
3450 ATTRIBUTE_GROUPS(con_dev);
3451
3452 static int vtconsole_init_device(struct con_driver *con)
3453 {
3454         con->flag |= CON_DRIVER_FLAG_ATTR;
3455         return 0;
3456 }
3457
3458 static void vtconsole_deinit_device(struct con_driver *con)
3459 {
3460         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3461 }
3462
3463 /**
3464  * con_is_bound - checks if driver is bound to the console
3465  * @csw: console driver
3466  *
3467  * RETURNS: zero if unbound, nonzero if bound
3468  *
3469  * Drivers can call this and if zero, they should release
3470  * all resources allocated on con_startup()
3471  */
3472 int con_is_bound(const struct consw *csw)
3473 {
3474         int i, bound = 0;
3475
3476         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3477                 if (con_driver_map[i] == csw) {
3478                         bound = 1;
3479                         break;
3480                 }
3481         }
3482
3483         return bound;
3484 }
3485 EXPORT_SYMBOL(con_is_bound);
3486
3487 /**
3488  * con_debug_enter - prepare the console for the kernel debugger
3489  * @sw: console driver
3490  *
3491  * Called when the console is taken over by the kernel debugger, this
3492  * function needs to save the current console state, then put the console
3493  * into a state suitable for the kernel debugger.
3494  *
3495  * RETURNS:
3496  * Zero on success, nonzero if a failure occurred when trying to prepare
3497  * the console for the debugger.
3498  */
3499 int con_debug_enter(struct vc_data *vc)
3500 {
3501         int ret = 0;
3502
3503         saved_fg_console = fg_console;
3504         saved_last_console = last_console;
3505         saved_want_console = want_console;
3506         saved_vc_mode = vc->vc_mode;
3507         saved_console_blanked = console_blanked;
3508         vc->vc_mode = KD_TEXT;
3509         console_blanked = 0;
3510         if (vc->vc_sw->con_debug_enter)
3511                 ret = vc->vc_sw->con_debug_enter(vc);
3512 #ifdef CONFIG_KGDB_KDB
3513         /* Set the initial LINES variable if it is not already set */
3514         if (vc->vc_rows < 999) {
3515                 int linecount;
3516                 char lns[4];
3517                 const char *setargs[3] = {
3518                         "set",
3519                         "LINES",
3520                         lns,
3521                 };
3522                 if (kdbgetintenv(setargs[0], &linecount)) {
3523                         snprintf(lns, 4, "%i", vc->vc_rows);
3524                         kdb_set(2, setargs);
3525                 }
3526         }
3527         if (vc->vc_cols < 999) {
3528                 int colcount;
3529                 char cols[4];
3530                 const char *setargs[3] = {
3531                         "set",
3532                         "COLUMNS",
3533                         cols,
3534                 };
3535                 if (kdbgetintenv(setargs[0], &colcount)) {
3536                         snprintf(cols, 4, "%i", vc->vc_cols);
3537                         kdb_set(2, setargs);
3538                 }
3539         }
3540 #endif /* CONFIG_KGDB_KDB */
3541         return ret;
3542 }
3543 EXPORT_SYMBOL_GPL(con_debug_enter);
3544
3545 /**
3546  * con_debug_leave - restore console state
3547  * @sw: console driver
3548  *
3549  * Restore the console state to what it was before the kernel debugger
3550  * was invoked.
3551  *
3552  * RETURNS:
3553  * Zero on success, nonzero if a failure occurred when trying to restore
3554  * the console.
3555  */
3556 int con_debug_leave(void)
3557 {
3558         struct vc_data *vc;
3559         int ret = 0;
3560
3561         fg_console = saved_fg_console;
3562         last_console = saved_last_console;
3563         want_console = saved_want_console;
3564         console_blanked = saved_console_blanked;
3565         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3566
3567         vc = vc_cons[fg_console].d;
3568         if (vc->vc_sw->con_debug_leave)
3569                 ret = vc->vc_sw->con_debug_leave(vc);
3570         return ret;
3571 }
3572 EXPORT_SYMBOL_GPL(con_debug_leave);
3573
3574 static int do_register_con_driver(const struct consw *csw, int first, int last)
3575 {
3576         struct module *owner = csw->owner;
3577         struct con_driver *con_driver;
3578         const char *desc;
3579         int i, retval;
3580
3581         WARN_CONSOLE_UNLOCKED();
3582
3583         if (!try_module_get(owner))
3584                 return -ENODEV;
3585
3586         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3587                 con_driver = &registered_con_driver[i];
3588
3589                 /* already registered */
3590                 if (con_driver->con == csw) {
3591                         retval = -EBUSY;
3592                         goto err;
3593                 }
3594         }
3595
3596         desc = csw->con_startup();
3597         if (!desc) {
3598                 retval = -ENODEV;
3599                 goto err;
3600         }
3601
3602         retval = -EINVAL;
3603
3604         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3605                 con_driver = &registered_con_driver[i];
3606
3607                 if (con_driver->con == NULL &&
3608                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3609                         con_driver->con = csw;
3610                         con_driver->desc = desc;
3611                         con_driver->node = i;
3612                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3613                                            CON_DRIVER_FLAG_INIT;
3614                         con_driver->first = first;
3615                         con_driver->last = last;
3616                         retval = 0;
3617                         break;
3618                 }
3619         }
3620
3621         if (retval)
3622                 goto err;
3623
3624         con_driver->dev =
3625                 device_create_with_groups(vtconsole_class, NULL,
3626                                           MKDEV(0, con_driver->node),
3627                                           con_driver, con_dev_groups,
3628                                           "vtcon%i", con_driver->node);
3629         if (IS_ERR(con_driver->dev)) {
3630                 printk(KERN_WARNING "Unable to create device for %s; "
3631                        "errno = %ld\n", con_driver->desc,
3632                        PTR_ERR(con_driver->dev));
3633                 con_driver->dev = NULL;
3634         } else {
3635                 vtconsole_init_device(con_driver);
3636         }
3637
3638 err:
3639         module_put(owner);
3640         return retval;
3641 }
3642
3643
3644 /**
3645  * do_unregister_con_driver - unregister console driver from console layer
3646  * @csw: console driver
3647  *
3648  * DESCRIPTION: All drivers that registers to the console layer must
3649  * call this function upon exit, or if the console driver is in a state
3650  * where it won't be able to handle console services, such as the
3651  * framebuffer console without loaded framebuffer drivers.
3652  *
3653  * The driver must unbind first prior to unregistration.
3654  */
3655 int do_unregister_con_driver(const struct consw *csw)
3656 {
3657         int i;
3658
3659         /* cannot unregister a bound driver */
3660         if (con_is_bound(csw))
3661                 return -EBUSY;
3662
3663         if (csw == conswitchp)
3664                 return -EINVAL;
3665
3666         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3667                 struct con_driver *con_driver = &registered_con_driver[i];
3668
3669                 if (con_driver->con == csw) {
3670                         /*
3671                          * Defer the removal of the sysfs entries since that
3672                          * will acquire the kernfs s_active lock and we can't
3673                          * acquire this lock while holding the console lock:
3674                          * the unbind sysfs entry imposes already the opposite
3675                          * order. Reset con already here to prevent any later
3676                          * lookup to succeed and mark this slot as zombie, so
3677                          * it won't get reused until we complete the removal
3678                          * in the deferred work.
3679                          */
3680                         con_driver->con = NULL;
3681                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3682                         schedule_work(&con_driver_unregister_work);
3683
3684                         return 0;
3685                 }
3686         }
3687
3688         return -ENODEV;
3689 }
3690 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3691
3692 static void con_driver_unregister_callback(struct work_struct *ignored)
3693 {
3694         int i;
3695
3696         console_lock();
3697
3698         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3699                 struct con_driver *con_driver = &registered_con_driver[i];
3700
3701                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3702                         continue;
3703
3704                 console_unlock();
3705
3706                 vtconsole_deinit_device(con_driver);
3707                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3708
3709                 console_lock();
3710
3711                 if (WARN_ON_ONCE(con_driver->con))
3712                         con_driver->con = NULL;
3713                 con_driver->desc = NULL;
3714                 con_driver->dev = NULL;
3715                 con_driver->node = 0;
3716                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3717                 con_driver->flag = 0;
3718                 con_driver->first = 0;
3719                 con_driver->last = 0;
3720         }
3721
3722         console_unlock();
3723 }
3724
3725 /*
3726  *      If we support more console drivers, this function is used
3727  *      when a driver wants to take over some existing consoles
3728  *      and become default driver for newly opened ones.
3729  *
3730  *      do_take_over_console is basically a register followed by unbind
3731  */
3732 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3733 {
3734         int err;
3735
3736         err = do_register_con_driver(csw, first, last);
3737         /*
3738          * If we get an busy error we still want to bind the console driver
3739          * and return success, as we may have unbound the console driver
3740          * but not unregistered it.
3741          */
3742         if (err == -EBUSY)
3743                 err = 0;
3744         if (!err)
3745                 do_bind_con_driver(csw, first, last, deflt);
3746
3747         return err;
3748 }
3749 EXPORT_SYMBOL_GPL(do_take_over_console);
3750
3751
3752 /*
3753  * give_up_console is a wrapper to unregister_con_driver. It will only
3754  * work if driver is fully unbound.
3755  */
3756 void give_up_console(const struct consw *csw)
3757 {
3758         console_lock();
3759         do_unregister_con_driver(csw);
3760         console_unlock();
3761 }
3762
3763 static int __init vtconsole_class_init(void)
3764 {
3765         int i;
3766
3767         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3768         if (IS_ERR(vtconsole_class)) {
3769                 printk(KERN_WARNING "Unable to create vt console class; "
3770                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3771                 vtconsole_class = NULL;
3772         }
3773
3774         /* Add system drivers to sysfs */
3775         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3776                 struct con_driver *con = &registered_con_driver[i];
3777
3778                 if (con->con && !con->dev) {
3779                         con->dev =
3780                                 device_create_with_groups(vtconsole_class, NULL,
3781                                                           MKDEV(0, con->node),
3782                                                           con, con_dev_groups,
3783                                                           "vtcon%i", con->node);
3784
3785                         if (IS_ERR(con->dev)) {
3786                                 printk(KERN_WARNING "Unable to create "
3787                                        "device for %s; errno = %ld\n",
3788                                        con->desc, PTR_ERR(con->dev));
3789                                 con->dev = NULL;
3790                         } else {
3791                                 vtconsole_init_device(con);
3792                         }
3793                 }
3794         }
3795
3796         return 0;
3797 }
3798 postcore_initcall(vtconsole_class_init);
3799
3800 #endif
3801
3802 /*
3803  *      Screen blanking
3804  */
3805
3806 static int set_vesa_blanking(char __user *p)
3807 {
3808         unsigned int mode;
3809
3810         if (get_user(mode, p + 1))
3811                 return -EFAULT;
3812
3813         vesa_blank_mode = (mode < 4) ? mode : 0;
3814         return 0;
3815 }
3816
3817 void do_blank_screen(int entering_gfx)
3818 {
3819         struct vc_data *vc = vc_cons[fg_console].d;
3820         int i;
3821
3822         WARN_CONSOLE_UNLOCKED();
3823
3824         if (console_blanked) {
3825                 if (blank_state == blank_vesa_wait) {
3826                         blank_state = blank_off;
3827                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3828                 }
3829                 return;
3830         }
3831
3832         /* entering graphics mode? */
3833         if (entering_gfx) {
3834                 hide_cursor(vc);
3835                 save_screen(vc);
3836                 vc->vc_sw->con_blank(vc, -1, 1);
3837                 console_blanked = fg_console + 1;
3838                 blank_state = blank_off;
3839                 set_origin(vc);
3840                 return;
3841         }
3842
3843         if (blank_state != blank_normal_wait)
3844                 return;
3845         blank_state = blank_off;
3846
3847         /* don't blank graphics */
3848         if (vc->vc_mode != KD_TEXT) {
3849                 console_blanked = fg_console + 1;
3850                 return;
3851         }
3852
3853         hide_cursor(vc);
3854         del_timer_sync(&console_timer);
3855         blank_timer_expired = 0;
3856
3857         save_screen(vc);
3858         /* In case we need to reset origin, blanking hook returns 1 */
3859         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3860         console_blanked = fg_console + 1;
3861         if (i)
3862                 set_origin(vc);
3863
3864         if (console_blank_hook && console_blank_hook(1))
3865                 return;
3866
3867         if (vesa_off_interval && vesa_blank_mode) {
3868                 blank_state = blank_vesa_wait;
3869                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3870         }
3871         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3872 }
3873 EXPORT_SYMBOL(do_blank_screen);
3874
3875 /*
3876  * Called by timer as well as from vt_console_driver
3877  */
3878 void do_unblank_screen(int leaving_gfx)
3879 {
3880         struct vc_data *vc;
3881
3882         /* This should now always be called from a "sane" (read: can schedule)
3883          * context for the sake of the low level drivers, except in the special
3884          * case of oops_in_progress
3885          */
3886         if (!oops_in_progress)
3887                 might_sleep();
3888
3889         WARN_CONSOLE_UNLOCKED();
3890
3891         ignore_poke = 0;
3892         if (!console_blanked)
3893                 return;
3894         if (!vc_cons_allocated(fg_console)) {
3895                 /* impossible */
3896                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3897                         fg_console + 1);
3898                 return;
3899         }
3900         vc = vc_cons[fg_console].d;
3901         /* Try to unblank in oops case too */
3902         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3903                 return; /* but leave console_blanked != 0 */
3904
3905         if (blankinterval) {
3906                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3907                 blank_state = blank_normal_wait;
3908         }
3909
3910         console_blanked = 0;
3911         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3912                 /* Low-level driver cannot restore -> do it ourselves */
3913                 update_screen(vc);
3914         if (console_blank_hook)
3915                 console_blank_hook(0);
3916         set_palette(vc);
3917         set_cursor(vc);
3918         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3919 }
3920 EXPORT_SYMBOL(do_unblank_screen);
3921
3922 /*
3923  * This is called by the outside world to cause a forced unblank, mostly for
3924  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3925  * call it with 1 as an argument and so force a mode restore... that may kill
3926  * X or at least garbage the screen but would also make the Oops visible...
3927  */
3928 void unblank_screen(void)
3929 {
3930         do_unblank_screen(0);
3931 }
3932
3933 /*
3934  * We defer the timer blanking to work queue so it can take the console mutex
3935  * (console operations can still happen at irq time, but only from printk which
3936  * has the console mutex. Not perfect yet, but better than no locking
3937  */
3938 static void blank_screen_t(unsigned long dummy)
3939 {
3940         if (unlikely(!keventd_up())) {
3941                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3942                 return;
3943         }
3944         blank_timer_expired = 1;
3945         schedule_work(&console_work);
3946 }
3947
3948 void poke_blanked_console(void)
3949 {
3950         WARN_CONSOLE_UNLOCKED();
3951
3952         /* Add this so we quickly catch whoever might call us in a non
3953          * safe context. Nowadays, unblank_screen() isn't to be called in
3954          * atomic contexts and is allowed to schedule (with the special case
3955          * of oops_in_progress, but that isn't of any concern for this
3956          * function. --BenH.
3957          */
3958         might_sleep();
3959
3960         /* This isn't perfectly race free, but a race here would be mostly harmless,
3961          * at worse, we'll do a spurrious blank and it's unlikely
3962          */
3963         del_timer(&console_timer);
3964         blank_timer_expired = 0;
3965
3966         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3967                 return;
3968         if (console_blanked)
3969                 unblank_screen();
3970         else if (blankinterval) {
3971                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3972                 blank_state = blank_normal_wait;
3973         }
3974 }
3975
3976 /*
3977  *      Palettes
3978  */
3979
3980 static void set_palette(struct vc_data *vc)
3981 {
3982         WARN_CONSOLE_UNLOCKED();
3983
3984         if (vc->vc_mode != KD_GRAPHICS)
3985                 vc->vc_sw->con_set_palette(vc, color_table);
3986 }
3987
3988 /*
3989  * Load palette into the DAC registers. arg points to a colour
3990  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3991  */
3992
3993 int con_set_cmap(unsigned char __user *arg)
3994 {
3995         int i, j, k;
3996         unsigned char colormap[3*16];
3997
3998         if (copy_from_user(colormap, arg, sizeof(colormap)))
3999                 return -EFAULT;
4000
4001         console_lock();
4002         for (i = k = 0; i < 16; i++) {
4003                 default_red[i] = colormap[k++];
4004                 default_grn[i] = colormap[k++];
4005                 default_blu[i] = colormap[k++];
4006         }
4007         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4008                 if (!vc_cons_allocated(i))
4009                         continue;
4010                 for (j = k = 0; j < 16; j++) {
4011                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4012                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4013                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4014                 }
4015                 set_palette(vc_cons[i].d);
4016         }
4017         console_unlock();
4018
4019         return 0;
4020 }
4021
4022 int con_get_cmap(unsigned char __user *arg)
4023 {
4024         int i, k;
4025         unsigned char colormap[3*16];
4026
4027         console_lock();
4028         for (i = k = 0; i < 16; i++) {
4029                 colormap[k++] = default_red[i];
4030                 colormap[k++] = default_grn[i];
4031                 colormap[k++] = default_blu[i];
4032         }
4033         console_unlock();
4034
4035         if (copy_to_user(arg, colormap, sizeof(colormap)))
4036                 return -EFAULT;
4037
4038         return 0;
4039 }
4040
4041 void reset_palette(struct vc_data *vc)
4042 {
4043         int j, k;
4044         for (j=k=0; j<16; j++) {
4045                 vc->vc_palette[k++] = default_red[j];
4046                 vc->vc_palette[k++] = default_grn[j];
4047                 vc->vc_palette[k++] = default_blu[j];
4048         }
4049         set_palette(vc);
4050 }
4051
4052 /*
4053  *  Font switching
4054  *
4055  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4056  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4057  *  depending on width) reserved for each character which is kinda wasty, but
4058  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4059  *  is up to the actual low-level console-driver convert data into its favorite
4060  *  format (maybe we should add a `fontoffset' field to the `display'
4061  *  structure so we won't have to convert the fontdata all the time.
4062  *  /Jes
4063  */
4064
4065 #define max_font_size 65536
4066
4067 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4068 {
4069         struct console_font font;
4070         int rc = -EINVAL;
4071         int c;
4072
4073         if (op->data) {
4074                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4075                 if (!font.data)
4076                         return -ENOMEM;
4077         } else
4078                 font.data = NULL;
4079
4080         console_lock();
4081         if (vc->vc_mode != KD_TEXT)
4082                 rc = -EINVAL;
4083         else if (vc->vc_sw->con_font_get)
4084                 rc = vc->vc_sw->con_font_get(vc, &font);
4085         else
4086                 rc = -ENOSYS;
4087         console_unlock();
4088
4089         if (rc)
4090                 goto out;
4091
4092         c = (font.width+7)/8 * 32 * font.charcount;
4093
4094         if (op->data && font.charcount > op->charcount)
4095                 rc = -ENOSPC;
4096         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4097                 if (font.width > op->width || font.height > op->height)
4098                         rc = -ENOSPC;
4099         } else {
4100                 if (font.width != 8)
4101                         rc = -EIO;
4102                 else if ((op->height && font.height > op->height) ||
4103                          font.height > 32)
4104                         rc = -ENOSPC;
4105         }
4106         if (rc)
4107                 goto out;
4108
4109         op->height = font.height;
4110         op->width = font.width;
4111         op->charcount = font.charcount;
4112
4113         if (op->data && copy_to_user(op->data, font.data, c))
4114                 rc = -EFAULT;
4115
4116 out:
4117         kfree(font.data);
4118         return rc;
4119 }
4120
4121 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4122 {
4123         struct console_font font;
4124         int rc = -EINVAL;
4125         int size;
4126
4127         if (vc->vc_mode != KD_TEXT)
4128                 return -EINVAL;
4129         if (!op->data)
4130                 return -EINVAL;
4131         if (op->charcount > 512)
4132                 return -EINVAL;
4133         if (!op->height) {              /* Need to guess font height [compat] */
4134                 int h, i;
4135                 u8 __user *charmap = op->data;
4136                 u8 tmp;
4137
4138                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4139                    so that we can get rid of this soon */
4140                 if (!(op->flags & KD_FONT_FLAG_OLD))
4141                         return -EINVAL;
4142                 for (h = 32; h > 0; h--)
4143                         for (i = 0; i < op->charcount; i++) {
4144                                 if (get_user(tmp, &charmap[32*i+h-1]))
4145                                         return -EFAULT;
4146                                 if (tmp)
4147                                         goto nonzero;
4148                         }
4149                 return -EINVAL;
4150         nonzero:
4151                 op->height = h;
4152         }
4153         if (op->width <= 0 || op->width > 32 || op->height > 32)
4154                 return -EINVAL;
4155         size = (op->width+7)/8 * 32 * op->charcount;
4156         if (size > max_font_size)
4157                 return -ENOSPC;
4158         font.charcount = op->charcount;
4159         font.height = op->height;
4160         font.width = op->width;
4161         font.data = memdup_user(op->data, size);
4162         if (IS_ERR(font.data))
4163                 return PTR_ERR(font.data);
4164         console_lock();
4165         if (vc->vc_mode != KD_TEXT)
4166                 rc = -EINVAL;
4167         else if (vc->vc_sw->con_font_set)
4168                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4169         else
4170                 rc = -ENOSYS;
4171         console_unlock();
4172         kfree(font.data);
4173         return rc;
4174 }
4175
4176 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4177 {
4178         struct console_font font = {.width = op->width, .height = op->height};
4179         char name[MAX_FONT_NAME];
4180         char *s = name;
4181         int rc;
4182
4183
4184         if (!op->data)
4185                 s = NULL;
4186         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4187                 return -EFAULT;
4188         else
4189                 name[MAX_FONT_NAME - 1] = 0;
4190
4191         console_lock();
4192         if (vc->vc_mode != KD_TEXT) {
4193                 console_unlock();
4194                 return -EINVAL;
4195         }
4196         if (vc->vc_sw->con_font_default)
4197                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4198         else
4199                 rc = -ENOSYS;
4200         console_unlock();
4201         if (!rc) {
4202                 op->width = font.width;
4203                 op->height = font.height;
4204         }
4205         return rc;
4206 }
4207
4208 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4209 {
4210         int con = op->height;
4211         int rc;
4212
4213
4214         console_lock();
4215         if (vc->vc_mode != KD_TEXT)
4216                 rc = -EINVAL;
4217         else if (!vc->vc_sw->con_font_copy)
4218                 rc = -ENOSYS;
4219         else if (con < 0 || !vc_cons_allocated(con))
4220                 rc = -ENOTTY;
4221         else if (con == vc->vc_num)     /* nothing to do */
4222                 rc = 0;
4223         else
4224                 rc = vc->vc_sw->con_font_copy(vc, con);
4225         console_unlock();
4226         return rc;
4227 }
4228
4229 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4230 {
4231         switch (op->op) {
4232         case KD_FONT_OP_SET:
4233                 return con_font_set(vc, op);
4234         case KD_FONT_OP_GET:
4235                 return con_font_get(vc, op);
4236         case KD_FONT_OP_SET_DEFAULT:
4237                 return con_font_default(vc, op);
4238         case KD_FONT_OP_COPY:
4239                 return con_font_copy(vc, op);
4240         }
4241         return -ENOSYS;
4242 }
4243
4244 /*
4245  *      Interface exported to selection and vcs.
4246  */
4247
4248 /* used by selection */
4249 u16 screen_glyph(struct vc_data *vc, int offset)
4250 {
4251         u16 w = scr_readw(screenpos(vc, offset, 1));
4252         u16 c = w & 0xff;
4253
4254         if (w & vc->vc_hi_font_mask)
4255                 c |= 0x100;
4256         return c;
4257 }
4258 EXPORT_SYMBOL_GPL(screen_glyph);
4259
4260 /* used by vcs - note the word offset */
4261 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4262 {
4263         return screenpos(vc, 2 * w_offset, viewed);
4264 }
4265 EXPORT_SYMBOL_GPL(screen_pos);
4266
4267 void getconsxy(struct vc_data *vc, unsigned char *p)
4268 {
4269         p[0] = vc->vc_x;
4270         p[1] = vc->vc_y;
4271 }
4272
4273 void putconsxy(struct vc_data *vc, unsigned char *p)
4274 {
4275         hide_cursor(vc);
4276         gotoxy(vc, p[0], p[1]);
4277         set_cursor(vc);
4278 }
4279
4280 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4281 {
4282         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4283                 return softcursor_original;
4284         return scr_readw(org);
4285 }
4286
4287 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4288 {
4289         scr_writew(val, org);
4290         if ((unsigned long)org == vc->vc_pos) {
4291                 softcursor_original = -1;
4292                 add_softcursor(vc);
4293         }
4294 }
4295
4296 void vcs_scr_updated(struct vc_data *vc)
4297 {
4298         notify_update(vc);
4299 }
4300
4301 /*
4302  *      Visible symbols for modules
4303  */
4304
4305 EXPORT_SYMBOL(color_table);
4306 EXPORT_SYMBOL(default_red);
4307 EXPORT_SYMBOL(default_grn);
4308 EXPORT_SYMBOL(default_blu);
4309 EXPORT_SYMBOL(update_region);
4310 EXPORT_SYMBOL(redraw_screen);
4311 EXPORT_SYMBOL(vc_resize);
4312 EXPORT_SYMBOL(fg_console);
4313 EXPORT_SYMBOL(console_blank_hook);
4314 EXPORT_SYMBOL(console_blanked);
4315 EXPORT_SYMBOL(vc_cons);
4316 EXPORT_SYMBOL(global_cursor_default);
4317 #ifndef VT_SINGLE_DRIVER
4318 EXPORT_SYMBOL(give_up_console);
4319 #endif