kernel/drivers/tty/vt/vt.c

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