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 static inline bool con_is_fg(const struct vc_data *vc)
 281 {
 282         return vc->vc_num == fg_console;
 283 }
 284
 285 static inline bool con_should_update(const struct vc_data *vc)
 286 {
 287         return con_is_visible(vc) && !console_blanked;
 288 }
 289
 290 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 291 {
 292         unsigned short *p;
 293
 294         if (!viewed)
 295                 p = (unsigned short *)(vc->vc_origin + offset);
 296         else if (!vc->vc_sw->con_screen_pos)
 297                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 298         else
 299                 p = vc->vc_sw->con_screen_pos(vc, offset);
 300         return p;
 301 }
 302
 303 /* Called  from the keyboard irq path.. */
 304 static inline void scrolldelta(int lines)
 305 {
 306         /* FIXME */
 307         /* scrolldelta needs some kind of consistency lock, but the BKL was
 308            and still is not protecting versus the scheduled back end */
 309         scrollback_delta += lines;
 310         schedule_console_callback();
 311 }
 312
 313 void schedule_console_callback(void)
 314 {
 315         schedule_work(&console_work);
 316 }
 317
 318 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 319 {
 320         unsigned short *d, *s;
 321
 322         if (t+nr >= b)
 323                 nr = b - t - 1;
 324         if (b > vc->vc_rows || t >= b || nr < 1)
 325                 return;
 326         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 327                 return;
 328         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 329         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 330         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 331         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 332                     vc->vc_size_row * nr);
 333 }
 334
 335 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 336 {
 337         unsigned short *s;
 338         unsigned int step;
 339
 340         if (t+nr >= b)
 341                 nr = b - t - 1;
 342         if (b > vc->vc_rows || t >= b || nr < 1)
 343                 return;
 344         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 345                 return;
 346         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 347         step = vc->vc_cols * nr;
 348         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 349         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 350 }
 351
 352 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 353 {
 354         unsigned int xx, yy, offset;
 355         u16 *p;
 356
 357         p = (u16 *) start;
 358         if (!vc->vc_sw->con_getxy) {
 359                 offset = (start - vc->vc_origin) / 2;
 360                 xx = offset % vc->vc_cols;
 361                 yy = offset / vc->vc_cols;
 362         } else {
 363                 int nxx, nyy;
 364                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 365                 xx = nxx; yy = nyy;
 366         }
 367         for(;;) {
 368                 u16 attrib = scr_readw(p) & 0xff00;
 369                 int startx = xx;
 370                 u16 *q = p;
 371                 while (xx < vc->vc_cols && count) {
 372                         if (attrib != (scr_readw(p) & 0xff00)) {
 373                                 if (p > q)
 374                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 375                                 startx = xx;
 376                                 q = p;
 377                                 attrib = scr_readw(p) & 0xff00;
 378                         }
 379                         p++;
 380                         xx++;
 381                         count--;
 382                 }
 383                 if (p > q)
 384                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 385                 if (!count)
 386                         break;
 387                 xx = 0;
 388                 yy++;
 389                 if (vc->vc_sw->con_getxy) {
 390                         p = (u16 *)start;
 391                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 392                 }
 393         }
 394 }
 395
 396 void update_region(struct vc_data *vc, unsigned long start, int count)
 397 {
 398         WARN_CONSOLE_UNLOCKED();
 399
 400         if (con_should_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 /*
 417  * ++roman: I completely changed the attribute format for monochrome
 418  * mode (!can_do_color). The formerly used MDA (monochrome display
 419  * adapter) format didn't allow the combination of certain effects.
 420  * Now the attribute is just a bit vector:
 421  *  Bit 0..1: intensity (0..2)
 422  *  Bit 2   : underline
 423  *  Bit 3   : reverse
 424  *  Bit 7   : blink
 425  */
 426         {
 427         u8 a = _color;
 428         if (!vc->vc_can_do_color)
 429                 return _intensity |
 430                        (_italic ? 2 : 0) |
 431                        (_underline ? 4 : 0) |
 432                        (_reverse ? 8 : 0) |
 433                        (_blink ? 0x80 : 0);
 434         if (_italic)
 435                 a = (a & 0xF0) | vc->vc_itcolor;
 436         else if (_underline)
 437                 a = (a & 0xf0) | vc->vc_ulcolor;
 438         else if (_intensity == 0)
 439                 a = (a & 0xf0) | vc->vc_ulcolor;
 440         if (_reverse)
 441                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 442         if (_blink)
 443                 a ^= 0x80;
 444         if (_intensity == 2)
 445                 a ^= 0x08;
 446         if (vc->vc_hi_font_mask == 0x100)
 447                 a <<= 1;
 448         return a;
 449         }
 450 }
 451
 452 static void update_attr(struct vc_data *vc)
 453 {
 454         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 455                       vc->vc_blink, vc->vc_underline,
 456                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 457         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 458 }
 459
 460 /* Note: inverting the screen twice should revert to the original state */
 461 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 462 {
 463         unsigned short *p;
 464
 465         WARN_CONSOLE_UNLOCKED();
 466
 467         count /= 2;
 468         p = screenpos(vc, offset, viewed);
 469         if (vc->vc_sw->con_invert_region) {
 470                 vc->vc_sw->con_invert_region(vc, p, count);
 471         } else {
 472                 u16 *q = p;
 473                 int cnt = count;
 474                 u16 a;
 475
 476                 if (!vc->vc_can_do_color) {
 477                         while (cnt--) {
 478                             a = scr_readw(q);
 479                             a ^= 0x0800;
 480                             scr_writew(a, q);
 481                             q++;
 482                         }
 483                 } else if (vc->vc_hi_font_mask == 0x100) {
 484                         while (cnt--) {
 485                                 a = scr_readw(q);
 486                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 487                                 scr_writew(a, q);
 488                                 q++;
 489                         }
 490                 } else {
 491                         while (cnt--) {
 492                                 a = scr_readw(q);
 493                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 494                                 scr_writew(a, q);
 495                                 q++;
 496                         }
 497                 }
 498         }
 499
 500         if (con_should_update(vc))
 501                 do_update_region(vc, (unsigned long) p, count);
 502         notify_update(vc);
 503 }
 504
 505 /* used by selection: complement pointer position */
 506 void complement_pos(struct vc_data *vc, int offset)
 507 {
 508         static int old_offset = -1;
 509         static unsigned short old;
 510         static unsigned short oldx, oldy;
 511
 512         WARN_CONSOLE_UNLOCKED();
 513
 514         if (old_offset != -1 && old_offset >= 0 &&
 515             old_offset < vc->vc_screenbuf_size) {
 516                 scr_writew(old, screenpos(vc, old_offset, 1));
 517                 if (con_should_update(vc))
 518                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 519                 notify_update(vc);
 520         }
 521
 522         old_offset = offset;
 523
 524         if (offset != -1 && offset >= 0 &&
 525             offset < vc->vc_screenbuf_size) {
 526                 unsigned short new;
 527                 unsigned short *p;
 528                 p = screenpos(vc, offset, 1);
 529                 old = scr_readw(p);
 530                 new = old ^ vc->vc_complement_mask;
 531                 scr_writew(new, p);
 532                 if (con_should_update(vc)) {
 533                         oldx = (offset >> 1) % vc->vc_cols;
 534                         oldy = (offset >> 1) / vc->vc_cols;
 535                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 536                 }
 537                 notify_update(vc);
 538         }
 539 }
 540
 541 static void insert_char(struct vc_data *vc, unsigned int nr)
 542 {
 543         unsigned short *p = (unsigned short *) vc->vc_pos;
 544
 545         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 546         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 547         vc->vc_need_wrap = 0;
 548         if (con_should_update(vc))
 549                 do_update_region(vc, (unsigned long) p,
 550                         vc->vc_cols - vc->vc_x);
 551 }
 552
 553 static void delete_char(struct vc_data *vc, unsigned int nr)
 554 {
 555         unsigned short *p = (unsigned short *) vc->vc_pos;
 556
 557         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 558         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 559                         nr * 2);
 560         vc->vc_need_wrap = 0;
 561         if (con_should_update(vc))
 562                 do_update_region(vc, (unsigned long) p,
 563                         vc->vc_cols - vc->vc_x);
 564 }
 565
 566 static int softcursor_original = -1;
 567
 568 static void add_softcursor(struct vc_data *vc)
 569 {
 570         int i = scr_readw((u16 *) vc->vc_pos);
 571         u32 type = vc->vc_cursor_type;
 572
 573         if (! (type & 0x10)) return;
 574         if (softcursor_original != -1) return;
 575         softcursor_original = i;
 576         i |= ((type >> 8) & 0xff00 );
 577         i ^= ((type) & 0xff00 );
 578         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 579         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 580         scr_writew(i, (u16 *) vc->vc_pos);
 581         if (con_should_update(vc))
 582                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 583 }
 584
 585 static void hide_softcursor(struct vc_data *vc)
 586 {
 587         if (softcursor_original != -1) {
 588                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 589                 if (con_should_update(vc))
 590                         vc->vc_sw->con_putc(vc, softcursor_original,
 591                                         vc->vc_y, vc->vc_x);
 592                 softcursor_original = -1;
 593         }
 594 }
 595
 596 static void hide_cursor(struct vc_data *vc)
 597 {
 598         if (vc == sel_cons)
 599                 clear_selection();
 600         vc->vc_sw->con_cursor(vc, CM_ERASE);
 601         hide_softcursor(vc);
 602 }
 603
 604 static void set_cursor(struct vc_data *vc)
 605 {
 606         if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
 607                 return;
 608         if (vc->vc_deccm) {
 609                 if (vc == sel_cons)
 610                         clear_selection();
 611                 add_softcursor(vc);
 612                 if ((vc->vc_cursor_type & 0x0f) != 1)
 613                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 614         } else
 615                 hide_cursor(vc);
 616 }
 617
 618 static void set_origin(struct vc_data *vc)
 619 {
 620         WARN_CONSOLE_UNLOCKED();
 621
 622         if (!con_is_visible(vc) ||
 623             !vc->vc_sw->con_set_origin ||
 624             !vc->vc_sw->con_set_origin(vc))
 625                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 626         vc->vc_visible_origin = vc->vc_origin;
 627         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 628         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 629 }
 630
 631 static void save_screen(struct vc_data *vc)
 632 {
 633         WARN_CONSOLE_UNLOCKED();
 634
 635         if (vc->vc_sw->con_save_screen)
 636                 vc->vc_sw->con_save_screen(vc);
 637 }
 638
 639 /*
 640  *      Redrawing of screen
 641  */
 642
 643 void clear_buffer_attributes(struct vc_data *vc)
 644 {
 645         unsigned short *p = (unsigned short *)vc->vc_origin;
 646         int count = vc->vc_screenbuf_size / 2;
 647         int mask = vc->vc_hi_font_mask | 0xff;
 648
 649         for (; count > 0; count--, p++) {
 650                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 651         }
 652 }
 653
 654 void redraw_screen(struct vc_data *vc, int is_switch)
 655 {
 656         int redraw = 0;
 657
 658         WARN_CONSOLE_UNLOCKED();
 659
 660         if (!vc) {
 661                 /* strange ... */
 662                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 663                 return;
 664         }
 665
 666         if (is_switch) {
 667                 struct vc_data *old_vc = vc_cons[fg_console].d;
 668                 if (old_vc == vc)
 669                         return;
 670                 if (!con_is_visible(vc))
 671                         redraw = 1;
 672                 *vc->vc_display_fg = vc;
 673                 fg_console = vc->vc_num;
 674                 hide_cursor(old_vc);
 675                 if (!con_is_visible(old_vc)) {
 676                         save_screen(old_vc);
 677                         set_origin(old_vc);
 678                 }
 679                 if (tty0dev)
 680                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 681         } else {
 682                 hide_cursor(vc);
 683                 redraw = 1;
 684         }
 685
 686         if (redraw) {
 687                 int update;
 688                 int old_was_color = vc->vc_can_do_color;
 689
 690                 set_origin(vc);
 691                 update = vc->vc_sw->con_switch(vc);
 692                 set_palette(vc);
 693                 /*
 694                  * If console changed from mono<->color, the best we can do
 695                  * is to clear the buffer attributes. As it currently stands,
 696                  * rebuilding new attributes from the old buffer is not doable
 697                  * without overly complex code.
 698                  */
 699                 if (old_was_color != vc->vc_can_do_color) {
 700                         update_attr(vc);
 701                         clear_buffer_attributes(vc);
 702                 }
 703
 704                 /* Forcibly update if we're panicing */
 705                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 706                     vt_force_oops_output(vc))
 707                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 708         }
 709         set_cursor(vc);
 710         if (is_switch) {
 711                 set_leds();
 712                 compute_shiftstate();
 713                 notify_update(vc);
 714         }
 715 }
 716
 717 /*
 718  *      Allocation, freeing and resizing of VTs.
 719  */
 720
 721 int vc_cons_allocated(unsigned int i)
 722 {
 723         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 724 }
 725
 726 static void visual_init(struct vc_data *vc, int num, int init)
 727 {
 728         /* ++Geert: vc->vc_sw->con_init determines console size */
 729         if (vc->vc_sw)
 730                 module_put(vc->vc_sw->owner);
 731         vc->vc_sw = conswitchp;
 732 #ifndef VT_SINGLE_DRIVER
 733         if (con_driver_map[num])
 734                 vc->vc_sw = con_driver_map[num];
 735 #endif
 736         __module_get(vc->vc_sw->owner);
 737         vc->vc_num = num;
 738         vc->vc_display_fg = &master_display_fg;
 739         if (vc->vc_uni_pagedir_loc)
 740                 con_free_unimap(vc);
 741         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 742         vc->vc_uni_pagedir = NULL;
 743         vc->vc_hi_font_mask = 0;
 744         vc->vc_complement_mask = 0;
 745         vc->vc_can_do_color = 0;
 746         vc->vc_panic_force_write = false;
 747         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
 748         vc->vc_sw->con_init(vc, init);
 749         if (!vc->vc_complement_mask)
 750                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 751         vc->vc_s_complement_mask = vc->vc_complement_mask;
 752         vc->vc_size_row = vc->vc_cols << 1;
 753         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 754 }
 755
 756 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 757 {
 758         struct vt_notifier_param param;
 759         struct vc_data *vc;
 760
 761         WARN_CONSOLE_UNLOCKED();
 762
 763         if (currcons >= MAX_NR_CONSOLES)
 764                 return -ENXIO;
 765
 766         if (vc_cons[currcons].d)
 767                 return 0;
 768
 769         /* due to the granularity of kmalloc, we waste some memory here */
 770         /* the alloc is done in two steps, to optimize the common situation
 771            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 772         /* although the numbers above are not valid since long ago, the
 773            point is still up-to-date and the comment still has its value
 774            even if only as a historical artifact.  --mj, July 1998 */
 775         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 776         if (!vc)
 777                 return -ENOMEM;
 778
 779         vc_cons[currcons].d = vc;
 780         tty_port_init(&vc->port);
 781         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 782
 783         visual_init(vc, currcons, 1);
 784
 785         if (!*vc->vc_uni_pagedir_loc)
 786                 con_set_default_unimap(vc);
 787
 788         vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 789         if (!vc->vc_screenbuf)
 790                 goto err_free;
 791
 792         /* If no drivers have overridden us and the user didn't pass a
 793            boot option, default to displaying the cursor */
 794         if (global_cursor_default == -1)
 795                 global_cursor_default = 1;
 796
 797         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 798         vcs_make_sysfs(currcons);
 799         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 800
 801         return 0;
 802 err_free:
 803         kfree(vc);
 804         vc_cons[currcons].d = NULL;
 805         return -ENOMEM;
 806 }
 807
 808 static inline int resize_screen(struct vc_data *vc, int width, int height,
 809                                 int user)
 810 {
 811         /* Resizes the resolution of the display adapater */
 812         int err = 0;
 813
 814         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 815                 err = vc->vc_sw->con_resize(vc, width, height, user);
 816
 817         return err;
 818 }
 819
 820 /*
 821  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 822  * [this is to be used together with some user program
 823  * like resize that changes the hardware videomode]
 824  */
 825 #define VC_RESIZE_MAXCOL (32767)
 826 #define VC_RESIZE_MAXROW (32767)
 827
 828 /**
 829  *      vc_do_resize    -       resizing method for the tty
 830  *      @tty: tty being resized
 831  *      @real_tty: real tty (different to tty if a pty/tty pair)
 832  *      @vc: virtual console private data
 833  *      @cols: columns
 834  *      @lines: lines
 835  *
 836  *      Resize a virtual console, clipping according to the actual constraints.
 837  *      If the caller passes a tty structure then update the termios winsize
 838  *      information and perform any necessary signal handling.
 839  *
 840  *      Caller must hold the console semaphore. Takes the termios rwsem and
 841  *      ctrl_lock of the tty IFF a tty is passed.
 842  */
 843
 844 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 845                                 unsigned int cols, unsigned int lines)
 846 {
 847         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 848         unsigned long end;
 849         unsigned int old_rows, old_row_size;
 850         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 851         unsigned int user;
 852         unsigned short *newscreen;
 853
 854         WARN_CONSOLE_UNLOCKED();
 855
 856         if (!vc)
 857                 return -ENXIO;
 858
 859         user = vc->vc_resize_user;
 860         vc->vc_resize_user = 0;
 861
 862         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 863                 return -EINVAL;
 864
 865         new_cols = (cols ? cols : vc->vc_cols);
 866         new_rows = (lines ? lines : vc->vc_rows);
 867         new_row_size = new_cols << 1;
 868         new_screen_size = new_row_size * new_rows;
 869
 870         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 871                 return 0;
 872
 873         newscreen = kmalloc(new_screen_size, GFP_USER);
 874         if (!newscreen)
 875                 return -ENOMEM;
 876
 877         old_rows = vc->vc_rows;
 878         old_row_size = vc->vc_size_row;
 879
 880         err = resize_screen(vc, new_cols, new_rows, user);
 881         if (err) {
 882                 kfree(newscreen);
 883                 return err;
 884         }
 885
 886         vc->vc_rows = new_rows;
 887         vc->vc_cols = new_cols;
 888         vc->vc_size_row = new_row_size;
 889         vc->vc_screenbuf_size = new_screen_size;
 890
 891         rlth = min(old_row_size, new_row_size);
 892         rrem = new_row_size - rlth;
 893         old_origin = vc->vc_origin;
 894         new_origin = (long) newscreen;
 895         new_scr_end = new_origin + new_screen_size;
 896
 897         if (vc->vc_y > new_rows) {
 898                 if (old_rows - vc->vc_y < new_rows) {
 899                         /*
 900                          * Cursor near the bottom, copy contents from the
 901                          * bottom of buffer
 902                          */
 903                         old_origin += (old_rows - new_rows) * old_row_size;
 904                 } else {
 905                         /*
 906                          * Cursor is in no man's land, copy 1/2 screenful
 907                          * from the top and bottom of cursor position
 908                          */
 909                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 910                 }
 911         }
 912
 913         end = old_origin + old_row_size * min(old_rows, new_rows);
 914
 915         update_attr(vc);
 916
 917         while (old_origin < end) {
 918                 scr_memcpyw((unsigned short *) new_origin,
 919                             (unsigned short *) old_origin, rlth);
 920                 if (rrem)
 921                         scr_memsetw((void *)(new_origin + rlth),
 922                                     vc->vc_video_erase_char, rrem);
 923                 old_origin += old_row_size;
 924                 new_origin += new_row_size;
 925         }
 926         if (new_scr_end > new_origin)
 927                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 928                             new_scr_end - new_origin);
 929         kfree(vc->vc_screenbuf);
 930         vc->vc_screenbuf = newscreen;
 931         vc->vc_screenbuf_size = new_screen_size;
 932         set_origin(vc);
 933
 934         /* do part of a reset_terminal() */
 935         vc->vc_top = 0;
 936         vc->vc_bottom = vc->vc_rows;
 937         gotoxy(vc, vc->vc_x, vc->vc_y);
 938         save_cur(vc);
 939
 940         if (tty) {
 941                 /* Rewrite the requested winsize data with the actual
 942                    resulting sizes */
 943                 struct winsize ws;
 944                 memset(&ws, 0, sizeof(ws));
 945                 ws.ws_row = vc->vc_rows;
 946                 ws.ws_col = vc->vc_cols;
 947                 ws.ws_ypixel = vc->vc_scan_lines;
 948                 tty_do_resize(tty, &ws);
 949         }
 950
 951         if (con_is_visible(vc))
 952                 update_screen(vc);
 953         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 954         return err;
 955 }
 956
 957 /**
 958  *      vc_resize               -       resize a VT
 959  *      @vc: virtual console
 960  *      @cols: columns
 961  *      @rows: rows
 962  *
 963  *      Resize a virtual console as seen from the console end of things. We
 964  *      use the common vc_do_resize methods to update the structures. The
 965  *      caller must hold the console sem to protect console internals and
 966  *      vc->port.tty
 967  */
 968
 969 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 970 {
 971         return vc_do_resize(vc->port.tty, vc, cols, rows);
 972 }
 973
 974 /**
 975  *      vt_resize               -       resize a VT
 976  *      @tty: tty to resize
 977  *      @ws: winsize attributes
 978  *
 979  *      Resize a virtual terminal. This is called by the tty layer as we
 980  *      register our own handler for resizing. The mutual helper does all
 981  *      the actual work.
 982  *
 983  *      Takes the console sem and the called methods then take the tty
 984  *      termios_rwsem and the tty ctrl_lock in that order.
 985  */
 986 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 987 {
 988         struct vc_data *vc = tty->driver_data;
 989         int ret;
 990
 991         console_lock();
 992         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 993         console_unlock();
 994         return ret;
 995 }
 996
 997 struct vc_data *vc_deallocate(unsigned int currcons)
 998 {
 999         struct vc_data *vc = NULL;
1000
1001         WARN_CONSOLE_UNLOCKED();
1002
1003         if (vc_cons_allocated(currcons)) {
1004                 struct vt_notifier_param param;
1005
1006                 param.vc = vc = vc_cons[currcons].d;
1007                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1008                 vcs_remove_sysfs(currcons);
1009                 vc->vc_sw->con_deinit(vc);
1010                 put_pid(vc->vt_pid);
1011                 module_put(vc->vc_sw->owner);
1012                 kfree(vc->vc_screenbuf);
1013                 vc_cons[currcons].d = NULL;
1014         }
1015         return vc;
1016 }
1017
1018 /*
1019  *      VT102 emulator
1020  */
1021
1022 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1023 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1024 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1025
1026 #define decarm          VC_REPEAT
1027 #define decckm          VC_CKMODE
1028 #define kbdapplic       VC_APPLIC
1029 #define lnm             VC_CRLF
1030
1031 /*
1032  * this is what the terminal answers to a ESC-Z or csi0c query.
1033  */
1034 #define VT100ID "\033[?1;2c"
1035 #define VT102ID "\033[?6c"
1036
1037 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1038                                        8,12,10,14, 9,13,11,15 };
1039
1040 /* the default colour table, for VGA+ colour systems */
1041 unsigned char default_red[] = {
1042         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1043         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1044 };
1045 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1046
1047 unsigned char default_grn[] = {
1048         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1049         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1050 };
1051 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1052
1053 unsigned char default_blu[] = {
1054         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1055         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1056 };
1057 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1058
1059 /*
1060  * gotoxy() must verify all boundaries, because the arguments
1061  * might also be negative. If the given position is out of
1062  * bounds, the cursor is placed at the nearest margin.
1063  */
1064 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1065 {
1066         int min_y, max_y;
1067
1068         if (new_x < 0)
1069                 vc->vc_x = 0;
1070         else {
1071                 if (new_x >= vc->vc_cols)
1072                         vc->vc_x = vc->vc_cols - 1;
1073                 else
1074                         vc->vc_x = new_x;
1075         }
1076
1077         if (vc->vc_decom) {
1078                 min_y = vc->vc_top;
1079                 max_y = vc->vc_bottom;
1080         } else {
1081                 min_y = 0;
1082                 max_y = vc->vc_rows;
1083         }
1084         if (new_y < min_y)
1085                 vc->vc_y = min_y;
1086         else if (new_y >= max_y)
1087                 vc->vc_y = max_y - 1;
1088         else
1089                 vc->vc_y = new_y;
1090         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1091         vc->vc_need_wrap = 0;
1092 }
1093
1094 /* for absolute user moves, when decom is set */
1095 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1096 {
1097         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1098 }
1099
1100 void scrollback(struct vc_data *vc)
1101 {
1102         scrolldelta(-(vc->vc_rows / 2));
1103 }
1104
1105 void scrollfront(struct vc_data *vc, int lines)
1106 {
1107         if (!lines)
1108                 lines = vc->vc_rows / 2;
1109         scrolldelta(lines);
1110 }
1111
1112 static void lf(struct vc_data *vc)
1113 {
1114         /* don't scroll if above bottom of scrolling region, or
1115          * if below scrolling region
1116          */
1117         if (vc->vc_y + 1 == vc->vc_bottom)
1118                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1119         else if (vc->vc_y < vc->vc_rows - 1) {
1120                 vc->vc_y++;
1121                 vc->vc_pos += vc->vc_size_row;
1122         }
1123         vc->vc_need_wrap = 0;
1124         notify_write(vc, '\n');
1125 }
1126
1127 static void ri(struct vc_data *vc)
1128 {
1129         /* don't scroll if below top of scrolling region, or
1130          * if above scrolling region
1131          */
1132         if (vc->vc_y == vc->vc_top)
1133                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1134         else if (vc->vc_y > 0) {
1135                 vc->vc_y--;
1136                 vc->vc_pos -= vc->vc_size_row;
1137         }
1138         vc->vc_need_wrap = 0;
1139 }
1140
1141 static inline void cr(struct vc_data *vc)
1142 {
1143         vc->vc_pos -= vc->vc_x << 1;
1144         vc->vc_need_wrap = vc->vc_x = 0;
1145         notify_write(vc, '\r');
1146 }
1147
1148 static inline void bs(struct vc_data *vc)
1149 {
1150         if (vc->vc_x) {
1151                 vc->vc_pos -= 2;
1152                 vc->vc_x--;
1153                 vc->vc_need_wrap = 0;
1154                 notify_write(vc, '\b');
1155         }
1156 }
1157
1158 static inline void del(struct vc_data *vc)
1159 {
1160         /* ignored */
1161 }
1162
1163 static void csi_J(struct vc_data *vc, int vpar)
1164 {
1165         unsigned int count;
1166         unsigned short * start;
1167
1168         switch (vpar) {
1169                 case 0: /* erase from cursor to end of display */
1170                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1171                         start = (unsigned short *)vc->vc_pos;
1172                         break;
1173                 case 1: /* erase from start to cursor */
1174                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1175                         start = (unsigned short *)vc->vc_origin;
1176                         break;
1177                 case 3: /* erase scroll-back buffer (and whole display) */
1178                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1179                                     vc->vc_screenbuf_size >> 1);
1180                         set_origin(vc);
1181                         if (con_is_visible(vc))
1182                                 update_screen(vc);
1183                         /* fall through */
1184                 case 2: /* erase whole display */
1185                         count = vc->vc_cols * vc->vc_rows;
1186                         start = (unsigned short *)vc->vc_origin;
1187                         break;
1188                 default:
1189                         return;
1190         }
1191         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1192         if (con_should_update(vc))
1193                 do_update_region(vc, (unsigned long) start, count);
1194         vc->vc_need_wrap = 0;
1195 }
1196
1197 static void csi_K(struct vc_data *vc, int vpar)
1198 {
1199         unsigned int count;
1200         unsigned short * start;
1201
1202         switch (vpar) {
1203                 case 0: /* erase from cursor to end of line */
1204                         count = vc->vc_cols - vc->vc_x;
1205                         start = (unsigned short *)vc->vc_pos;
1206                         break;
1207                 case 1: /* erase from start of line to cursor */
1208                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1209                         count = vc->vc_x + 1;
1210                         break;
1211                 case 2: /* erase whole line */
1212                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1213                         count = vc->vc_cols;
1214                         break;
1215                 default:
1216                         return;
1217         }
1218         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1219         vc->vc_need_wrap = 0;
1220         if (con_should_update(vc))
1221                 do_update_region(vc, (unsigned long) start, count);
1222 }
1223
1224 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1225 {                                         /* not vt100? */
1226         int count;
1227
1228         if (!vpar)
1229                 vpar++;
1230         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1231
1232         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1233         if (con_should_update(vc))
1234                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1235         vc->vc_need_wrap = 0;
1236 }
1237
1238 static void default_attr(struct vc_data *vc)
1239 {
1240         vc->vc_intensity = 1;
1241         vc->vc_italic = 0;
1242         vc->vc_underline = 0;
1243         vc->vc_reverse = 0;
1244         vc->vc_blink = 0;
1245         vc->vc_color = vc->vc_def_color;
1246 }
1247
1248 struct rgb { u8 r; u8 g; u8 b; };
1249
1250 static void rgb_from_256(int i, struct rgb *c)
1251 {
1252         if (i < 8) {            /* Standard colours. */
1253                 c->r = i&1 ? 0xaa : 0x00;
1254                 c->g = i&2 ? 0xaa : 0x00;
1255                 c->b = i&4 ? 0xaa : 0x00;
1256         } else if (i < 16) {
1257                 c->r = i&1 ? 0xff : 0x55;
1258                 c->g = i&2 ? 0xff : 0x55;
1259                 c->b = i&4 ? 0xff : 0x55;
1260         } else if (i < 232) {   /* 6x6x6 colour cube. */
1261                 c->r = (i - 16) / 36 * 85 / 2;
1262                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1263                 c->b = (i - 16) % 6 * 85 / 2;
1264         } else                  /* Grayscale ramp. */
1265                 c->r = c->g = c->b = i * 10 - 2312;
1266 }
1267
1268 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1269 {
1270         u8 hue = 0, max = max3(c->r, c->g, c->b);
1271
1272         if (c->r > max / 2)
1273                 hue |= 4;
1274         if (c->g > max / 2)
1275                 hue |= 2;
1276         if (c->b > max / 2)
1277                 hue |= 1;
1278
1279         if (hue == 7 && max <= 0x55) {
1280                 hue = 0;
1281                 vc->vc_intensity = 2;
1282         } else if (max > 0xaa)
1283                 vc->vc_intensity = 2;
1284         else
1285                 vc->vc_intensity = 1;
1286
1287         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1288 }
1289
1290 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1291 {
1292         /* For backgrounds, err on the dark side. */
1293         vc->vc_color = (vc->vc_color & 0x0f)
1294                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1295 }
1296
1297 /*
1298  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1299  * and thus need to be detected and ignored by hand. Strictly speaking, that
1300  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1301  * no one produces such codes and almost no one accepts them.
1302  *
1303  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1304  * supporting them.
1305  */
1306 static int vc_t416_color(struct vc_data *vc, int i,
1307                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1308 {
1309         struct rgb c;
1310
1311         i++;
1312         if (i > vc->vc_npar)
1313                 return i;
1314
1315         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1316                 /* 256 colours */
1317                 i++;
1318                 rgb_from_256(vc->vc_par[i], &c);
1319         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1320                 /* 24 bit */
1321                 c.r = vc->vc_par[i + 1];
1322                 c.g = vc->vc_par[i + 2];
1323                 c.b = vc->vc_par[i + 3];
1324                 i += 3;
1325         } else
1326                 return i;
1327
1328         set_color(vc, &c);
1329
1330         return i;
1331 }
1332
1333 /* console_lock is held */
1334 static void csi_m(struct vc_data *vc)
1335 {
1336         int i;
1337
1338         for (i = 0; i <= vc->vc_npar; i++)
1339                 switch (vc->vc_par[i]) {
1340                 case 0: /* all attributes off */
1341                         default_attr(vc);
1342                         break;
1343                 case 1:
1344                         vc->vc_intensity = 2;
1345                         break;
1346                 case 2:
1347                         vc->vc_intensity = 0;
1348                         break;
1349                 case 3:
1350                         vc->vc_italic = 1;
1351                         break;
1352                 case 4:
1353                         vc->vc_underline = 1;
1354                         break;
1355                 case 5:
1356                         vc->vc_blink = 1;
1357                         break;
1358                 case 7:
1359                         vc->vc_reverse = 1;
1360                         break;
1361                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1362                           * Select primary font, don't display control chars if
1363                           * defined, don't set bit 8 on output.
1364                           */
1365                         vc->vc_translate = set_translate(vc->vc_charset == 0
1366                                         ? vc->vc_G0_charset
1367                                         : vc->vc_G1_charset, vc);
1368                         vc->vc_disp_ctrl = 0;
1369                         vc->vc_toggle_meta = 0;
1370                         break;
1371                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1372                           * Select first alternate font, lets chars < 32 be
1373                           * displayed as ROM chars.
1374                           */
1375                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1376                         vc->vc_disp_ctrl = 1;
1377                         vc->vc_toggle_meta = 0;
1378                         break;
1379                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1380                           * Select second alternate font, toggle high bit
1381                           * before displaying as ROM char.
1382                           */
1383                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1384                         vc->vc_disp_ctrl = 1;
1385                         vc->vc_toggle_meta = 1;
1386                         break;
1387                 case 21:
1388                 case 22:
1389                         vc->vc_intensity = 1;
1390                         break;
1391                 case 23:
1392                         vc->vc_italic = 0;
1393                         break;
1394                 case 24:
1395                         vc->vc_underline = 0;
1396                         break;
1397                 case 25:
1398                         vc->vc_blink = 0;
1399                         break;
1400                 case 27:
1401                         vc->vc_reverse = 0;
1402                         break;
1403                 case 38:
1404                         i = vc_t416_color(vc, i, rgb_foreground);
1405                         break;
1406                 case 48:
1407                         i = vc_t416_color(vc, i, rgb_background);
1408                         break;
1409                 case 39:
1410                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1411                                 (vc->vc_color & 0xf0);
1412                         break;
1413                 case 49:
1414                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1415                                 (vc->vc_color & 0x0f);
1416                         break;
1417                 default:
1418                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1419                                 if (vc->vc_par[i] < 100)
1420                                         vc->vc_intensity = 2;
1421                                 vc->vc_par[i] -= 60;
1422                         }
1423                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1424                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1425                                         | (vc->vc_color & 0xf0);
1426                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1427                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1428                                         | (vc->vc_color & 0x0f);
1429                         break;
1430                 }
1431         update_attr(vc);
1432 }
1433
1434 static void respond_string(const char *p, struct tty_port *port)
1435 {
1436         while (*p) {
1437                 tty_insert_flip_char(port, *p, 0);
1438                 p++;
1439         }
1440         tty_schedule_flip(port);
1441 }
1442
1443 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1444 {
1445         char buf[40];
1446
1447         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1448         respond_string(buf, tty->port);
1449 }
1450
1451 static inline void status_report(struct tty_struct *tty)
1452 {
1453         respond_string("\033[0n", tty->port);   /* Terminal ok */
1454 }
1455
1456 static inline void respond_ID(struct tty_struct *tty)
1457 {
1458         respond_string(VT102ID, tty->port);
1459 }
1460
1461 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1462 {
1463         char buf[8];
1464
1465         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1466                 (char)('!' + mry));
1467         respond_string(buf, tty->port);
1468 }
1469
1470 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1471 int mouse_reporting(void)
1472 {
1473         return vc_cons[fg_console].d->vc_report_mouse;
1474 }
1475
1476 /* console_lock is held */
1477 static void set_mode(struct vc_data *vc, int on_off)
1478 {
1479         int i;
1480
1481         for (i = 0; i <= vc->vc_npar; i++)
1482                 if (vc->vc_ques) {
1483                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1484                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1485                                 if (on_off)
1486                                         set_kbd(vc, decckm);
1487                                 else
1488                                         clr_kbd(vc, decckm);
1489                                 break;
1490                         case 3: /* 80/132 mode switch unimplemented */
1491 #if 0
1492                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1493                                 /* this alone does not suffice; some user mode
1494                                    utility has to change the hardware regs */
1495 #endif
1496                                 break;
1497                         case 5:                 /* Inverted screen on/off */
1498                                 if (vc->vc_decscnm != on_off) {
1499                                         vc->vc_decscnm = on_off;
1500                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1501                                         update_attr(vc);
1502                                 }
1503                                 break;
1504                         case 6:                 /* Origin relative/absolute */
1505                                 vc->vc_decom = on_off;
1506                                 gotoxay(vc, 0, 0);
1507                                 break;
1508                         case 7:                 /* Autowrap on/off */
1509                                 vc->vc_decawm = on_off;
1510                                 break;
1511                         case 8:                 /* Autorepeat on/off */
1512                                 if (on_off)
1513                                         set_kbd(vc, decarm);
1514                                 else
1515                                         clr_kbd(vc, decarm);
1516                                 break;
1517                         case 9:
1518                                 vc->vc_report_mouse = on_off ? 1 : 0;
1519                                 break;
1520                         case 25:                /* Cursor on/off */
1521                                 vc->vc_deccm = on_off;
1522                                 break;
1523                         case 1000:
1524                                 vc->vc_report_mouse = on_off ? 2 : 0;
1525                                 break;
1526                         }
1527                 } else {
1528                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1529                         case 3:                 /* Monitor (display ctrls) */
1530                                 vc->vc_disp_ctrl = on_off;
1531                                 break;
1532                         case 4:                 /* Insert Mode on/off */
1533                                 vc->vc_decim = on_off;
1534                                 break;
1535                         case 20:                /* Lf, Enter == CrLf/Lf */
1536                                 if (on_off)
1537                                         set_kbd(vc, lnm);
1538                                 else
1539                                         clr_kbd(vc, lnm);
1540                                 break;
1541                         }
1542                 }
1543 }
1544
1545 /* console_lock is held */
1546 static void setterm_command(struct vc_data *vc)
1547 {
1548         switch(vc->vc_par[0]) {
1549                 case 1: /* set color for underline mode */
1550                         if (vc->vc_can_do_color &&
1551                                         vc->vc_par[1] < 16) {
1552                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1553                                 if (vc->vc_underline)
1554                                         update_attr(vc);
1555                         }
1556                         break;
1557                 case 2: /* set color for half intensity mode */
1558                         if (vc->vc_can_do_color &&
1559                                         vc->vc_par[1] < 16) {
1560                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1561                                 if (vc->vc_intensity == 0)
1562                                         update_attr(vc);
1563                         }
1564                         break;
1565                 case 8: /* store colors as defaults */
1566                         vc->vc_def_color = vc->vc_attr;
1567                         if (vc->vc_hi_font_mask == 0x100)
1568                                 vc->vc_def_color >>= 1;
1569                         default_attr(vc);
1570                         update_attr(vc);
1571                         break;
1572                 case 9: /* set blanking interval */
1573                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1574                         poke_blanked_console();
1575                         break;
1576                 case 10: /* set bell frequency in Hz */
1577                         if (vc->vc_npar >= 1)
1578                                 vc->vc_bell_pitch = vc->vc_par[1];
1579                         else
1580                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1581                         break;
1582                 case 11: /* set bell duration in msec */
1583                         if (vc->vc_npar >= 1)
1584                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1585                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1586                         else
1587                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1588                         break;
1589                 case 12: /* bring specified console to the front */
1590                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1591                                 set_console(vc->vc_par[1] - 1);
1592                         break;
1593                 case 13: /* unblank the screen */
1594                         poke_blanked_console();
1595                         break;
1596                 case 14: /* set vesa powerdown interval */
1597                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1598                         break;
1599                 case 15: /* activate the previous console */
1600                         set_console(last_console);
1601                         break;
1602                 case 16: /* set cursor blink duration in msec */
1603                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1604                                         vc->vc_par[1] <= USHRT_MAX)
1605                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1606                         else
1607                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1608                         break;
1609         }
1610 }
1611
1612 /* console_lock is held */
1613 static void csi_at(struct vc_data *vc, unsigned int nr)
1614 {
1615         if (nr > vc->vc_cols - vc->vc_x)
1616                 nr = vc->vc_cols - vc->vc_x;
1617         else if (!nr)
1618                 nr = 1;
1619         insert_char(vc, nr);
1620 }
1621
1622 /* console_lock is held */
1623 static void csi_L(struct vc_data *vc, unsigned int nr)
1624 {
1625         if (nr > vc->vc_rows - vc->vc_y)
1626                 nr = vc->vc_rows - vc->vc_y;
1627         else if (!nr)
1628                 nr = 1;
1629         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1630         vc->vc_need_wrap = 0;
1631 }
1632
1633 /* console_lock is held */
1634 static void csi_P(struct vc_data *vc, unsigned int nr)
1635 {
1636         if (nr > vc->vc_cols - vc->vc_x)
1637                 nr = vc->vc_cols - vc->vc_x;
1638         else if (!nr)
1639                 nr = 1;
1640         delete_char(vc, nr);
1641 }
1642
1643 /* console_lock is held */
1644 static void csi_M(struct vc_data *vc, unsigned int nr)
1645 {
1646         if (nr > vc->vc_rows - vc->vc_y)
1647                 nr = vc->vc_rows - vc->vc_y;
1648         else if (!nr)
1649                 nr=1;
1650         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1651         vc->vc_need_wrap = 0;
1652 }
1653
1654 /* console_lock is held (except via vc_init->reset_terminal */
1655 static void save_cur(struct vc_data *vc)
1656 {
1657         vc->vc_saved_x          = vc->vc_x;
1658         vc->vc_saved_y          = vc->vc_y;
1659         vc->vc_s_intensity      = vc->vc_intensity;
1660         vc->vc_s_italic         = vc->vc_italic;
1661         vc->vc_s_underline      = vc->vc_underline;
1662         vc->vc_s_blink          = vc->vc_blink;
1663         vc->vc_s_reverse        = vc->vc_reverse;
1664         vc->vc_s_charset        = vc->vc_charset;
1665         vc->vc_s_color          = vc->vc_color;
1666         vc->vc_saved_G0         = vc->vc_G0_charset;
1667         vc->vc_saved_G1         = vc->vc_G1_charset;
1668 }
1669
1670 /* console_lock is held */
1671 static void restore_cur(struct vc_data *vc)
1672 {
1673         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1674         vc->vc_intensity        = vc->vc_s_intensity;
1675         vc->vc_italic           = vc->vc_s_italic;
1676         vc->vc_underline        = vc->vc_s_underline;
1677         vc->vc_blink            = vc->vc_s_blink;
1678         vc->vc_reverse          = vc->vc_s_reverse;
1679         vc->vc_charset          = vc->vc_s_charset;
1680         vc->vc_color            = vc->vc_s_color;
1681         vc->vc_G0_charset       = vc->vc_saved_G0;
1682         vc->vc_G1_charset       = vc->vc_saved_G1;
1683         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1684         update_attr(vc);
1685         vc->vc_need_wrap = 0;
1686 }
1687
1688 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1689         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1690         ESpalette, ESosc };
1691
1692 /* console_lock is held (except via vc_init()) */
1693 static void reset_terminal(struct vc_data *vc, int do_clear)
1694 {
1695         vc->vc_top              = 0;
1696         vc->vc_bottom           = vc->vc_rows;
1697         vc->vc_state            = ESnormal;
1698         vc->vc_ques             = 0;
1699         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1700         vc->vc_G0_charset       = LAT1_MAP;
1701         vc->vc_G1_charset       = GRAF_MAP;
1702         vc->vc_charset          = 0;
1703         vc->vc_need_wrap        = 0;
1704         vc->vc_report_mouse     = 0;
1705         vc->vc_utf              = default_utf8;
1706         vc->vc_utf_count        = 0;
1707
1708         vc->vc_disp_ctrl        = 0;
1709         vc->vc_toggle_meta      = 0;
1710
1711         vc->vc_decscnm          = 0;
1712         vc->vc_decom            = 0;
1713         vc->vc_decawm           = 1;
1714         vc->vc_deccm            = global_cursor_default;
1715         vc->vc_decim            = 0;
1716
1717         vt_reset_keyboard(vc->vc_num);
1718
1719         vc->vc_cursor_type = cur_default;
1720         vc->vc_complement_mask = vc->vc_s_complement_mask;
1721
1722         default_attr(vc);
1723         update_attr(vc);
1724
1725         vc->vc_tab_stop[0]      = 0x01010100;
1726         vc->vc_tab_stop[1]      =
1727         vc->vc_tab_stop[2]      =
1728         vc->vc_tab_stop[3]      =
1729         vc->vc_tab_stop[4]      =
1730         vc->vc_tab_stop[5]      =
1731         vc->vc_tab_stop[6]      =
1732         vc->vc_tab_stop[7]      = 0x01010101;
1733
1734         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1735         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1736         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1737
1738         gotoxy(vc, 0, 0);
1739         save_cur(vc);
1740         if (do_clear)
1741             csi_J(vc, 2);
1742 }
1743
1744 /* console_lock is held */
1745 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1746 {
1747         /*
1748          *  Control characters can be used in the _middle_
1749          *  of an escape sequence.
1750          */
1751         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1752                 return;
1753         switch (c) {
1754         case 0:
1755                 return;
1756         case 7:
1757                 if (vc->vc_state == ESosc)
1758                         vc->vc_state = ESnormal;
1759                 else if (vc->vc_bell_duration)
1760                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1761                 return;
1762         case 8:
1763                 bs(vc);
1764                 return;
1765         case 9:
1766                 vc->vc_pos -= (vc->vc_x << 1);
1767                 while (vc->vc_x < vc->vc_cols - 1) {
1768                         vc->vc_x++;
1769                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1770                                 break;
1771                 }
1772                 vc->vc_pos += (vc->vc_x << 1);
1773                 notify_write(vc, '\t');
1774                 return;
1775         case 10: case 11: case 12:
1776                 lf(vc);
1777                 if (!is_kbd(vc, lnm))
1778                         return;
1779         case 13:
1780                 cr(vc);
1781                 return;
1782         case 14:
1783                 vc->vc_charset = 1;
1784                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1785                 vc->vc_disp_ctrl = 1;
1786                 return;
1787         case 15:
1788                 vc->vc_charset = 0;
1789                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1790                 vc->vc_disp_ctrl = 0;
1791                 return;
1792         case 24: case 26:
1793                 vc->vc_state = ESnormal;
1794                 return;
1795         case 27:
1796                 vc->vc_state = ESesc;
1797                 return;
1798         case 127:
1799                 del(vc);
1800                 return;
1801         case 128+27:
1802                 vc->vc_state = ESsquare;
1803                 return;
1804         }
1805         switch(vc->vc_state) {
1806         case ESesc:
1807                 vc->vc_state = ESnormal;
1808                 switch (c) {
1809                 case '[':
1810                         vc->vc_state = ESsquare;
1811                         return;
1812                 case ']':
1813                         vc->vc_state = ESnonstd;
1814                         return;
1815                 case '%':
1816                         vc->vc_state = ESpercent;
1817                         return;
1818                 case 'E':
1819                         cr(vc);
1820                         lf(vc);
1821                         return;
1822                 case 'M':
1823                         ri(vc);
1824                         return;
1825                 case 'D':
1826                         lf(vc);
1827                         return;
1828                 case 'H':
1829                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1830                         return;
1831                 case 'Z':
1832                         respond_ID(tty);
1833                         return;
1834                 case '7':
1835                         save_cur(vc);
1836                         return;
1837                 case '8':
1838                         restore_cur(vc);
1839                         return;
1840                 case '(':
1841                         vc->vc_state = ESsetG0;
1842                         return;
1843                 case ')':
1844                         vc->vc_state = ESsetG1;
1845                         return;
1846                 case '#':
1847                         vc->vc_state = EShash;
1848                         return;
1849                 case 'c':
1850                         reset_terminal(vc, 1);
1851                         return;
1852                 case '>':  /* Numeric keypad */
1853                         clr_kbd(vc, kbdapplic);
1854                         return;
1855                 case '=':  /* Appl. keypad */
1856                         set_kbd(vc, kbdapplic);
1857                         return;
1858                 }
1859                 return;
1860         case ESnonstd:
1861                 if (c=='P') {   /* palette escape sequence */
1862                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1863                                 vc->vc_par[vc->vc_npar] = 0;
1864                         vc->vc_npar = 0;
1865                         vc->vc_state = ESpalette;
1866                         return;
1867                 } else if (c=='R') {   /* reset palette */
1868                         reset_palette(vc);
1869                         vc->vc_state = ESnormal;
1870                 } else if (c>='0' && c<='9')
1871                         vc->vc_state = ESosc;
1872                 else
1873                         vc->vc_state = ESnormal;
1874                 return;
1875         case ESpalette:
1876                 if (isxdigit(c)) {
1877                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1878                         if (vc->vc_npar == 7) {
1879                                 int i = vc->vc_par[0] * 3, j = 1;
1880                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1881                                 vc->vc_palette[i++] += vc->vc_par[j++];
1882                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1883                                 vc->vc_palette[i++] += vc->vc_par[j++];
1884                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1885                                 vc->vc_palette[i] += vc->vc_par[j];
1886                                 set_palette(vc);
1887                                 vc->vc_state = ESnormal;
1888                         }
1889                 } else
1890                         vc->vc_state = ESnormal;
1891                 return;
1892         case ESsquare:
1893                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1894                         vc->vc_par[vc->vc_npar] = 0;
1895                 vc->vc_npar = 0;
1896                 vc->vc_state = ESgetpars;
1897                 if (c == '[') { /* Function key */
1898                         vc->vc_state=ESfunckey;
1899                         return;
1900                 }
1901                 vc->vc_ques = (c == '?');
1902                 if (vc->vc_ques)
1903                         return;
1904         case ESgetpars:
1905                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1906                         vc->vc_npar++;
1907                         return;
1908                 } else if (c>='0' && c<='9') {
1909                         vc->vc_par[vc->vc_npar] *= 10;
1910                         vc->vc_par[vc->vc_npar] += c - '0';
1911                         return;
1912                 }
1913                 vc->vc_state = ESnormal;
1914                 switch(c) {
1915                 case 'h':
1916                         set_mode(vc, 1);
1917                         return;
1918                 case 'l':
1919                         set_mode(vc, 0);
1920                         return;
1921                 case 'c':
1922                         if (vc->vc_ques) {
1923                                 if (vc->vc_par[0])
1924                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1925                                 else
1926                                         vc->vc_cursor_type = cur_default;
1927                                 return;
1928                         }
1929                         break;
1930                 case 'm':
1931                         if (vc->vc_ques) {
1932                                 clear_selection();
1933                                 if (vc->vc_par[0])
1934                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1935                                 else
1936                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1937                                 return;
1938                         }
1939                         break;
1940                 case 'n':
1941                         if (!vc->vc_ques) {
1942                                 if (vc->vc_par[0] == 5)
1943                                         status_report(tty);
1944                                 else if (vc->vc_par[0] == 6)
1945                                         cursor_report(vc, tty);
1946                         }
1947                         return;
1948                 }
1949                 if (vc->vc_ques) {
1950                         vc->vc_ques = 0;
1951                         return;
1952                 }
1953                 switch(c) {
1954                 case 'G': case '`':
1955                         if (vc->vc_par[0])
1956                                 vc->vc_par[0]--;
1957                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1958                         return;
1959                 case 'A':
1960                         if (!vc->vc_par[0])
1961                                 vc->vc_par[0]++;
1962                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1963                         return;
1964                 case 'B': case 'e':
1965                         if (!vc->vc_par[0])
1966                                 vc->vc_par[0]++;
1967                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1968                         return;
1969                 case 'C': case 'a':
1970                         if (!vc->vc_par[0])
1971                                 vc->vc_par[0]++;
1972                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1973                         return;
1974                 case 'D':
1975                         if (!vc->vc_par[0])
1976                                 vc->vc_par[0]++;
1977                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1978                         return;
1979                 case 'E':
1980                         if (!vc->vc_par[0])
1981                                 vc->vc_par[0]++;
1982                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1983                         return;
1984                 case 'F':
1985                         if (!vc->vc_par[0])
1986                                 vc->vc_par[0]++;
1987                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1988                         return;
1989                 case 'd':
1990                         if (vc->vc_par[0])
1991                                 vc->vc_par[0]--;
1992                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1993                         return;
1994                 case 'H': case 'f':
1995                         if (vc->vc_par[0])
1996                                 vc->vc_par[0]--;
1997                         if (vc->vc_par[1])
1998                                 vc->vc_par[1]--;
1999                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2000                         return;
2001                 case 'J':
2002                         csi_J(vc, vc->vc_par[0]);
2003                         return;
2004                 case 'K':
2005                         csi_K(vc, vc->vc_par[0]);
2006                         return;
2007                 case 'L':
2008                         csi_L(vc, vc->vc_par[0]);
2009                         return;
2010                 case 'M':
2011                         csi_M(vc, vc->vc_par[0]);
2012                         return;
2013                 case 'P':
2014                         csi_P(vc, vc->vc_par[0]);
2015                         return;
2016                 case 'c':
2017                         if (!vc->vc_par[0])
2018                                 respond_ID(tty);
2019                         return;
2020                 case 'g':
2021                         if (!vc->vc_par[0])
2022                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2023                         else if (vc->vc_par[0] == 3) {
2024                                 vc->vc_tab_stop[0] =
2025                                         vc->vc_tab_stop[1] =
2026                                         vc->vc_tab_stop[2] =
2027                                         vc->vc_tab_stop[3] =
2028                                         vc->vc_tab_stop[4] =
2029                                         vc->vc_tab_stop[5] =
2030                                         vc->vc_tab_stop[6] =
2031                                         vc->vc_tab_stop[7] = 0;
2032                         }
2033                         return;
2034                 case 'm':
2035                         csi_m(vc);
2036                         return;
2037                 case 'q': /* DECLL - but only 3 leds */
2038                         /* map 0,1,2,3 to 0,1,2,4 */
2039                         if (vc->vc_par[0] < 4)
2040                                 vt_set_led_state(vc->vc_num,
2041                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2042                         return;
2043                 case 'r':
2044                         if (!vc->vc_par[0])
2045                                 vc->vc_par[0]++;
2046                         if (!vc->vc_par[1])
2047                                 vc->vc_par[1] = vc->vc_rows;
2048                         /* Minimum allowed region is 2 lines */
2049                         if (vc->vc_par[0] < vc->vc_par[1] &&
2050                             vc->vc_par[1] <= vc->vc_rows) {
2051                                 vc->vc_top = vc->vc_par[0] - 1;
2052                                 vc->vc_bottom = vc->vc_par[1];
2053                                 gotoxay(vc, 0, 0);
2054                         }
2055                         return;
2056                 case 's':
2057                         save_cur(vc);
2058                         return;
2059                 case 'u':
2060                         restore_cur(vc);
2061                         return;
2062                 case 'X':
2063                         csi_X(vc, vc->vc_par[0]);
2064                         return;
2065                 case '@':
2066                         csi_at(vc, vc->vc_par[0]);
2067                         return;
2068                 case ']': /* setterm functions */
2069                         setterm_command(vc);
2070                         return;
2071                 }
2072                 return;
2073         case ESpercent:
2074                 vc->vc_state = ESnormal;
2075                 switch (c) {
2076                 case '@':  /* defined in ISO 2022 */
2077                         vc->vc_utf = 0;
2078                         return;
2079                 case 'G':  /* prelim official escape code */
2080                 case '8':  /* retained for compatibility */
2081                         vc->vc_utf = 1;
2082                         return;
2083                 }
2084                 return;
2085         case ESfunckey:
2086                 vc->vc_state = ESnormal;
2087                 return;
2088         case EShash:
2089                 vc->vc_state = ESnormal;
2090                 if (c == '8') {
2091                         /* DEC screen alignment test. kludge :-) */
2092                         vc->vc_video_erase_char =
2093                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2094                         csi_J(vc, 2);
2095                         vc->vc_video_erase_char =
2096                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2097                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2098                 }
2099                 return;
2100         case ESsetG0:
2101                 if (c == '0')
2102                         vc->vc_G0_charset = GRAF_MAP;
2103                 else if (c == 'B')
2104                         vc->vc_G0_charset = LAT1_MAP;
2105                 else if (c == 'U')
2106                         vc->vc_G0_charset = IBMPC_MAP;
2107                 else if (c == 'K')
2108                         vc->vc_G0_charset = USER_MAP;
2109                 if (vc->vc_charset == 0)
2110                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2111                 vc->vc_state = ESnormal;
2112                 return;
2113         case ESsetG1:
2114                 if (c == '0')
2115                         vc->vc_G1_charset = GRAF_MAP;
2116                 else if (c == 'B')
2117                         vc->vc_G1_charset = LAT1_MAP;
2118                 else if (c == 'U')
2119                         vc->vc_G1_charset = IBMPC_MAP;
2120                 else if (c == 'K')
2121                         vc->vc_G1_charset = USER_MAP;
2122                 if (vc->vc_charset == 1)
2123                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2124                 vc->vc_state = ESnormal;
2125                 return;
2126         case ESosc:
2127                 return;
2128         default:
2129                 vc->vc_state = ESnormal;
2130         }
2131 }
2132
2133 /* is_double_width() is based on the wcwidth() implementation by
2134  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2135  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2136  */
2137 struct interval {
2138         uint32_t first;
2139         uint32_t last;
2140 };
2141
2142 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2143 {
2144         int min = 0;
2145         int mid;
2146
2147         if (ucs < table[0].first || ucs > table[max].last)
2148                 return 0;
2149         while (max >= min) {
2150                 mid = (min + max) / 2;
2151                 if (ucs > table[mid].last)
2152                         min = mid + 1;
2153                 else if (ucs < table[mid].first)
2154                         max = mid - 1;
2155                 else
2156                         return 1;
2157         }
2158         return 0;
2159 }
2160
2161 static int is_double_width(uint32_t ucs)
2162 {
2163         static const struct interval double_width[] = {
2164                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2165                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2166                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2167                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2168         };
2169         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2170 }
2171
2172 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2173                 unsigned long draw_to, int *draw_x)
2174 {
2175         if (*draw_x < 0)
2176                 return;
2177
2178         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2179                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2180         *draw_x = -1;
2181 }
2182
2183 /* acquires console_lock */
2184 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2185 {
2186         int c, tc, ok, n = 0, draw_x = -1;
2187         unsigned int currcons;
2188         unsigned long draw_from = 0, draw_to = 0;
2189         struct vc_data *vc;
2190         unsigned char vc_attr;
2191         struct vt_notifier_param param;
2192         uint8_t rescan;
2193         uint8_t inverse;
2194         uint8_t width;
2195         u16 himask, charmask;
2196
2197         if (in_interrupt())
2198                 return count;
2199
2200         might_sleep();
2201
2202         console_lock();
2203         vc = tty->driver_data;
2204         if (vc == NULL) {
2205                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2206                 console_unlock();
2207                 return 0;
2208         }
2209
2210         currcons = vc->vc_num;
2211         if (!vc_cons_allocated(currcons)) {
2212                 /* could this happen? */
2213                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2214                 console_unlock();
2215                 return 0;
2216         }
2217
2218         himask = vc->vc_hi_font_mask;
2219         charmask = himask ? 0x1ff : 0xff;
2220
2221         /* undraw cursor first */
2222         if (con_is_fg(vc))
2223                 hide_cursor(vc);
2224
2225         param.vc = vc;
2226
2227         while (!tty->stopped && count) {
2228                 int orig = *buf;
2229                 c = orig;
2230                 buf++;
2231                 n++;
2232                 count--;
2233                 rescan = 0;
2234                 inverse = 0;
2235                 width = 1;
2236
2237                 /* Do no translation at all in control states */
2238                 if (vc->vc_state != ESnormal) {
2239                         tc = c;
2240                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2241                     /* Combine UTF-8 into Unicode in vc_utf_char.
2242                      * vc_utf_count is the number of continuation bytes still
2243                      * expected to arrive.
2244                      * vc_npar is the number of continuation bytes arrived so
2245                      * far
2246                      */
2247 rescan_last_byte:
2248                     if ((c & 0xc0) == 0x80) {
2249                         /* Continuation byte received */
2250                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2251                         if (vc->vc_utf_count) {
2252                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2253                             vc->vc_npar++;
2254                             if (--vc->vc_utf_count) {
2255                                 /* Still need some bytes */
2256                                 continue;
2257                             }
2258                             /* Got a whole character */
2259                             c = vc->vc_utf_char;
2260                             /* Reject overlong sequences */
2261                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2262                                         c > utf8_length_changes[vc->vc_npar])
2263                                 c = 0xfffd;
2264                         } else {
2265                             /* Unexpected continuation byte */
2266                             vc->vc_utf_count = 0;
2267                             c = 0xfffd;
2268                         }
2269                     } else {
2270                         /* Single ASCII byte or first byte of a sequence received */
2271                         if (vc->vc_utf_count) {
2272                             /* Continuation byte expected */
2273                             rescan = 1;
2274                             vc->vc_utf_count = 0;
2275                             c = 0xfffd;
2276                         } else if (c > 0x7f) {
2277                             /* First byte of a multibyte sequence received */
2278                             vc->vc_npar = 0;
2279                             if ((c & 0xe0) == 0xc0) {
2280                                 vc->vc_utf_count = 1;
2281                                 vc->vc_utf_char = (c & 0x1f);
2282                             } else if ((c & 0xf0) == 0xe0) {
2283                                 vc->vc_utf_count = 2;
2284                                 vc->vc_utf_char = (c & 0x0f);
2285                             } else if ((c & 0xf8) == 0xf0) {
2286                                 vc->vc_utf_count = 3;
2287                                 vc->vc_utf_char = (c & 0x07);
2288                             } else if ((c & 0xfc) == 0xf8) {
2289                                 vc->vc_utf_count = 4;
2290                                 vc->vc_utf_char = (c & 0x03);
2291                             } else if ((c & 0xfe) == 0xfc) {
2292                                 vc->vc_utf_count = 5;
2293                                 vc->vc_utf_char = (c & 0x01);
2294                             } else {
2295                                 /* 254 and 255 are invalid */
2296                                 c = 0xfffd;
2297                             }
2298                             if (vc->vc_utf_count) {
2299                                 /* Still need some bytes */
2300                                 continue;
2301                             }
2302                         }
2303                         /* Nothing to do if an ASCII byte was received */
2304                     }
2305                     /* End of UTF-8 decoding. */
2306                     /* c is the received character, or U+FFFD for invalid sequences. */
2307                     /* Replace invalid Unicode code points with U+FFFD too */
2308                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2309                         c = 0xfffd;
2310                     tc = c;
2311                 } else {        /* no utf or alternate charset mode */
2312                     tc = vc_translate(vc, c);
2313                 }
2314
2315                 param.c = tc;
2316                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2317                                         &param) == NOTIFY_STOP)
2318                         continue;
2319
2320                 /* If the original code was a control character we
2321                  * only allow a glyph to be displayed if the code is
2322                  * not normally used (such as for cursor movement) or
2323                  * if the disp_ctrl mode has been explicitly enabled.
2324                  * Certain characters (as given by the CTRL_ALWAYS
2325                  * bitmap) are always displayed as control characters,
2326                  * as the console would be pretty useless without
2327                  * them; to display an arbitrary font position use the
2328                  * direct-to-font zone in UTF-8 mode.
2329                  */
2330                 ok = tc && (c >= 32 ||
2331                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2332                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2333                         && (c != 127 || vc->vc_disp_ctrl)
2334                         && (c != 128+27);
2335
2336                 if (vc->vc_state == ESnormal && ok) {
2337                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2338                                 if (is_double_width(c))
2339                                         width = 2;
2340                         }
2341                         /* Now try to find out how to display it */
2342                         tc = conv_uni_to_pc(vc, tc);
2343                         if (tc & ~charmask) {
2344                                 if (tc == -1 || tc == -2) {
2345                                     continue; /* nothing to display */
2346                                 }
2347                                 /* Glyph not found */
2348                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2349                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2350                                        This would make absolutely no sense with Unicode in mind,
2351                                        but do this for ASCII characters since a font may lack
2352                                        Unicode mapping info and we don't want to end up with
2353                                        having question marks only. */
2354                                     tc = c;
2355                                 } else {
2356                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2357                                     tc = conv_uni_to_pc(vc, 0xfffd);
2358                                     if (tc < 0) {
2359                                         inverse = 1;
2360                                         tc = conv_uni_to_pc(vc, '?');
2361                                         if (tc < 0) tc = '?';
2362                                     }
2363                                 }
2364                         }
2365
2366                         if (!inverse) {
2367                                 vc_attr = vc->vc_attr;
2368                         } else {
2369                                 /* invert vc_attr */
2370                                 if (!vc->vc_can_do_color) {
2371                                         vc_attr = (vc->vc_attr) ^ 0x08;
2372                                 } else if (vc->vc_hi_font_mask == 0x100) {
2373                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2374                                 } else {
2375                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2376                                 }
2377                                 con_flush(vc, draw_from, draw_to, &draw_x);
2378                         }
2379
2380                         while (1) {
2381                                 if (vc->vc_need_wrap || vc->vc_decim)
2382                                         con_flush(vc, draw_from, draw_to,
2383                                                         &draw_x);
2384                                 if (vc->vc_need_wrap) {
2385                                         cr(vc);
2386                                         lf(vc);
2387                                 }
2388                                 if (vc->vc_decim)
2389                                         insert_char(vc, 1);
2390                                 scr_writew(himask ?
2391                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2392                                              (vc_attr << 8) + tc,
2393                                            (u16 *) vc->vc_pos);
2394                                 if (con_should_update(vc) && draw_x < 0) {
2395                                         draw_x = vc->vc_x;
2396                                         draw_from = vc->vc_pos;
2397                                 }
2398                                 if (vc->vc_x == vc->vc_cols - 1) {
2399                                         vc->vc_need_wrap = vc->vc_decawm;
2400                                         draw_to = vc->vc_pos + 2;
2401                                 } else {
2402                                         vc->vc_x++;
2403                                         draw_to = (vc->vc_pos += 2);
2404                                 }
2405
2406                                 if (!--width) break;
2407
2408                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2409                                 if (tc < 0) tc = ' ';
2410                         }
2411                         notify_write(vc, c);
2412
2413                         if (inverse)
2414                                 con_flush(vc, draw_from, draw_to, &draw_x);
2415
2416                         if (rescan) {
2417                                 rescan = 0;
2418                                 inverse = 0;
2419                                 width = 1;
2420                                 c = orig;
2421                                 goto rescan_last_byte;
2422                         }
2423                         continue;
2424                 }
2425                 con_flush(vc, draw_from, draw_to, &draw_x);
2426                 do_con_trol(tty, vc, orig);
2427         }
2428         con_flush(vc, draw_from, draw_to, &draw_x);
2429         console_conditional_schedule();
2430         console_unlock();
2431         notify_update(vc);
2432         return n;
2433 }
2434
2435 /*
2436  * This is the console switching callback.
2437  *
2438  * Doing console switching in a process context allows
2439  * us to do the switches asynchronously (needed when we want
2440  * to switch due to a keyboard interrupt).  Synchronization
2441  * with other console code and prevention of re-entrancy is
2442  * ensured with console_lock.
2443  */
2444 static void console_callback(struct work_struct *ignored)
2445 {
2446         console_lock();
2447
2448         if (want_console >= 0) {
2449                 if (want_console != fg_console &&
2450                     vc_cons_allocated(want_console)) {
2451                         hide_cursor(vc_cons[fg_console].d);
2452                         change_console(vc_cons[want_console].d);
2453                         /* we only changed when the console had already
2454                            been allocated - a new console is not created
2455                            in an interrupt routine */
2456                 }
2457                 want_console = -1;
2458         }
2459         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2460                 do_poke_blanked_console = 0;
2461                 poke_blanked_console();
2462         }
2463         if (scrollback_delta) {
2464                 struct vc_data *vc = vc_cons[fg_console].d;
2465                 clear_selection();
2466                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2467                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2468                 scrollback_delta = 0;
2469         }
2470         if (blank_timer_expired) {
2471                 do_blank_screen(0);
2472                 blank_timer_expired = 0;
2473         }
2474         notify_update(vc_cons[fg_console].d);
2475
2476         console_unlock();
2477 }
2478
2479 int set_console(int nr)
2480 {
2481         struct vc_data *vc = vc_cons[fg_console].d;
2482
2483         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2484                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2485
2486                 /*
2487                  * Console switch will fail in console_callback() or
2488                  * change_console() so there is no point scheduling
2489                  * the callback
2490                  *
2491                  * Existing set_console() users don't check the return
2492                  * value so this shouldn't break anything
2493                  */
2494                 return -EINVAL;
2495         }
2496
2497         want_console = nr;
2498         schedule_console_callback();
2499
2500         return 0;
2501 }
2502
2503 struct tty_driver *console_driver;
2504
2505 #ifdef CONFIG_VT_CONSOLE
2506
2507 /**
2508  * vt_kmsg_redirect() - Sets/gets the kernel message console
2509  * @new:        The new virtual terminal number or -1 if the console should stay
2510  *              unchanged
2511  *
2512  * By default, the kernel messages are always printed on the current virtual
2513  * console. However, the user may modify that default with the
2514  * TIOCL_SETKMSGREDIRECT ioctl call.
2515  *
2516  * This function sets the kernel message console to be @new. It returns the old
2517  * virtual console number. The virtual terminal number 0 (both as parameter and
2518  * return value) means no redirection (i.e. always printed on the currently
2519  * active console).
2520  *
2521  * The parameter -1 means that only the current console is returned, but the
2522  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2523  * case to make the code more understandable.
2524  *
2525  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2526  * the parameter and always returns 0.
2527  */
2528 int vt_kmsg_redirect(int new)
2529 {
2530         static int kmsg_con;
2531
2532         if (new != -1)
2533                 return xchg(&kmsg_con, new);
2534         else
2535                 return kmsg_con;
2536 }
2537
2538 /*
2539  *      Console on virtual terminal
2540  *
2541  * The console must be locked when we get here.
2542  */
2543
2544 static void vt_console_print(struct console *co, const char *b, unsigned count)
2545 {
2546         struct vc_data *vc = vc_cons[fg_console].d;
2547         unsigned char c;
2548         static DEFINE_SPINLOCK(printing_lock);
2549         const ushort *start;
2550         ushort cnt = 0;
2551         ushort myx;
2552         int kmsg_console;
2553
2554         /* console busy or not yet initialized */
2555         if (!printable)
2556                 return;
2557         if (!spin_trylock(&printing_lock))
2558                 return;
2559
2560         kmsg_console = vt_get_kmsg_redirect();
2561         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2562                 vc = vc_cons[kmsg_console - 1].d;
2563
2564         /* read `x' only after setting currcons properly (otherwise
2565            the `x' macro will read the x of the foreground console). */
2566         myx = vc->vc_x;
2567
2568         if (!vc_cons_allocated(fg_console)) {
2569                 /* impossible */
2570                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2571                 goto quit;
2572         }
2573
2574         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2575                 goto quit;
2576
2577         /* undraw cursor first */
2578         if (con_is_fg(vc))
2579                 hide_cursor(vc);
2580
2581         start = (ushort *)vc->vc_pos;
2582
2583         /* Contrived structure to try to emulate original need_wrap behaviour
2584          * Problems caused when we have need_wrap set on '\n' character */
2585         while (count--) {
2586                 c = *b++;
2587                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2588                         if (cnt > 0) {
2589                                 if (con_is_visible(vc))
2590                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2591                                 vc->vc_x += cnt;
2592                                 if (vc->vc_need_wrap)
2593                                         vc->vc_x--;
2594                                 cnt = 0;
2595                         }
2596                         if (c == 8) {           /* backspace */
2597                                 bs(vc);
2598                                 start = (ushort *)vc->vc_pos;
2599                                 myx = vc->vc_x;
2600                                 continue;
2601                         }
2602                         if (c != 13)
2603                                 lf(vc);
2604                         cr(vc);
2605                         start = (ushort *)vc->vc_pos;
2606                         myx = vc->vc_x;
2607                         if (c == 10 || c == 13)
2608                                 continue;
2609                 }
2610                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2611                 notify_write(vc, c);
2612                 cnt++;
2613                 if (myx == vc->vc_cols - 1) {
2614                         vc->vc_need_wrap = 1;
2615                         continue;
2616                 }
2617                 vc->vc_pos += 2;
2618                 myx++;
2619         }
2620         if (cnt > 0) {
2621                 if (con_is_visible(vc))
2622                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2623                 vc->vc_x += cnt;
2624                 if (vc->vc_x == vc->vc_cols) {
2625                         vc->vc_x--;
2626                         vc->vc_need_wrap = 1;
2627                 }
2628         }
2629         set_cursor(vc);
2630         notify_update(vc);
2631
2632 quit:
2633         spin_unlock(&printing_lock);
2634 }
2635
2636 static struct tty_driver *vt_console_device(struct console *c, int *index)
2637 {
2638         *index = c->index ? c->index-1 : fg_console;
2639         return console_driver;
2640 }
2641
2642 static struct console vt_console_driver = {
2643         .name           = "tty",
2644         .write          = vt_console_print,
2645         .device         = vt_console_device,
2646         .unblank        = unblank_screen,
2647         .flags          = CON_PRINTBUFFER,
2648         .index          = -1,
2649 };
2650 #endif
2651
2652 /*
2653  *      Handling of Linux-specific VC ioctls
2654  */
2655
2656 /*
2657  * Generally a bit racy with respect to console_lock();.
2658  *
2659  * There are some functions which don't need it.
2660  *
2661  * There are some functions which can sleep for arbitrary periods
2662  * (paste_selection) but we don't need the lock there anyway.
2663  *
2664  * set_selection has locking, and definitely needs it
2665  */
2666
2667 int tioclinux(struct tty_struct *tty, unsigned long arg)
2668 {
2669         char type, data;
2670         char __user *p = (char __user *)arg;
2671         int lines;
2672         int ret;
2673
2674         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2675                 return -EPERM;
2676         if (get_user(type, p))
2677                 return -EFAULT;
2678         ret = 0;
2679
2680         switch (type)
2681         {
2682                 case TIOCL_SETSEL:
2683                         console_lock();
2684                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2685                         console_unlock();
2686                         break;
2687                 case TIOCL_PASTESEL:
2688                         ret = paste_selection(tty);
2689                         break;
2690                 case TIOCL_UNBLANKSCREEN:
2691                         console_lock();
2692                         unblank_screen();
2693                         console_unlock();
2694                         break;
2695                 case TIOCL_SELLOADLUT:
2696                         console_lock();
2697                         ret = sel_loadlut(p);
2698                         console_unlock();
2699                         break;
2700                 case TIOCL_GETSHIFTSTATE:
2701
2702         /*
2703          * Make it possible to react to Shift+Mousebutton.
2704          * Note that 'shift_state' is an undocumented
2705          * kernel-internal variable; programs not closely
2706          * related to the kernel should not use this.
2707          */
2708                         data = vt_get_shift_state();
2709                         ret = __put_user(data, p);
2710                         break;
2711                 case TIOCL_GETMOUSEREPORTING:
2712                         console_lock(); /* May be overkill */
2713                         data = mouse_reporting();
2714                         console_unlock();
2715                         ret = __put_user(data, p);
2716                         break;
2717                 case TIOCL_SETVESABLANK:
2718                         console_lock();
2719                         ret = set_vesa_blanking(p);
2720                         console_unlock();
2721                         break;
2722                 case TIOCL_GETKMSGREDIRECT:
2723                         data = vt_get_kmsg_redirect();
2724                         ret = __put_user(data, p);
2725                         break;
2726                 case TIOCL_SETKMSGREDIRECT:
2727                         if (!capable(CAP_SYS_ADMIN)) {
2728                                 ret = -EPERM;
2729                         } else {
2730                                 if (get_user(data, p+1))
2731                                         ret = -EFAULT;
2732                                 else
2733                                         vt_kmsg_redirect(data);
2734                         }
2735                         break;
2736                 case TIOCL_GETFGCONSOLE:
2737                         /* No locking needed as this is a transiently
2738                            correct return anyway if the caller hasn't
2739                            disabled switching */
2740                         ret = fg_console;
2741                         break;
2742                 case TIOCL_SCROLLCONSOLE:
2743                         if (get_user(lines, (s32 __user *)(p+4))) {
2744                                 ret = -EFAULT;
2745                         } else {
2746                                 /* Need the console lock here. Note that lots
2747                                    of other calls need fixing before the lock
2748                                    is actually useful ! */
2749                                 console_lock();
2750                                 scrollfront(vc_cons[fg_console].d, lines);
2751                                 console_unlock();
2752                                 ret = 0;
2753                         }
2754                         break;
2755                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2756                         console_lock();
2757                         ignore_poke = 1;
2758                         do_blank_screen(0);
2759                         console_unlock();
2760                         break;
2761                 case TIOCL_BLANKEDSCREEN:
2762                         ret = console_blanked;
2763                         break;
2764                 default:
2765                         ret = -EINVAL;
2766                         break;
2767         }
2768         return ret;
2769 }
2770
2771 /*
2772  * /dev/ttyN handling
2773  */
2774
2775 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2776 {
2777         int     retval;
2778
2779         retval = do_con_write(tty, buf, count);
2780         con_flush_chars(tty);
2781
2782         return retval;
2783 }
2784
2785 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2786 {
2787         if (in_interrupt())
2788                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2789         return do_con_write(tty, &ch, 1);
2790 }
2791
2792 static int con_write_room(struct tty_struct *tty)
2793 {
2794         if (tty->stopped)
2795                 return 0;
2796         return 32768;           /* No limit, really; we're not buffering */
2797 }
2798
2799 static int con_chars_in_buffer(struct tty_struct *tty)
2800 {
2801         return 0;               /* we're not buffering */
2802 }
2803
2804 /*
2805  * con_throttle and con_unthrottle are only used for
2806  * paste_selection(), which has to stuff in a large number of
2807  * characters...
2808  */
2809 static void con_throttle(struct tty_struct *tty)
2810 {
2811 }
2812
2813 static void con_unthrottle(struct tty_struct *tty)
2814 {
2815         struct vc_data *vc = tty->driver_data;
2816
2817         wake_up_interruptible(&vc->paste_wait);
2818 }
2819
2820 /*
2821  * Turn the Scroll-Lock LED on when the tty is stopped
2822  */
2823 static void con_stop(struct tty_struct *tty)
2824 {
2825         int console_num;
2826         if (!tty)
2827                 return;
2828         console_num = tty->index;
2829         if (!vc_cons_allocated(console_num))
2830                 return;
2831         vt_kbd_con_stop(console_num);
2832 }
2833
2834 /*
2835  * Turn the Scroll-Lock LED off when the console is started
2836  */
2837 static void con_start(struct tty_struct *tty)
2838 {
2839         int console_num;
2840         if (!tty)
2841                 return;
2842         console_num = tty->index;
2843         if (!vc_cons_allocated(console_num))
2844                 return;
2845         vt_kbd_con_start(console_num);
2846 }
2847
2848 static void con_flush_chars(struct tty_struct *tty)
2849 {
2850         struct vc_data *vc;
2851
2852         if (in_interrupt())     /* from flush_to_ldisc */
2853                 return;
2854
2855         /* if we race with con_close(), vt may be null */
2856         console_lock();
2857         vc = tty->driver_data;
2858         if (vc)
2859                 set_cursor(vc);
2860         console_unlock();
2861 }
2862
2863 /*
2864  * Allocate the console screen memory.
2865  */
2866 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2867 {
2868         unsigned int currcons = tty->index;
2869         struct vc_data *vc;
2870         int ret;
2871
2872         console_lock();
2873         ret = vc_allocate(currcons);
2874         if (ret)
2875                 goto unlock;
2876
2877         vc = vc_cons[currcons].d;
2878
2879         /* Still being freed */
2880         if (vc->port.tty) {
2881                 ret = -ERESTARTSYS;
2882                 goto unlock;
2883         }
2884
2885         ret = tty_port_install(&vc->port, driver, tty);
2886         if (ret)
2887                 goto unlock;
2888
2889         tty->driver_data = vc;
2890         vc->port.tty = tty;
2891
2892         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2893                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2894                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2895         }
2896         if (vc->vc_utf)
2897                 tty->termios.c_iflag |= IUTF8;
2898         else
2899                 tty->termios.c_iflag &= ~IUTF8;
2900 unlock:
2901         console_unlock();
2902         return ret;
2903 }
2904
2905 static int con_open(struct tty_struct *tty, struct file *filp)
2906 {
2907         /* everything done in install */
2908         return 0;
2909 }
2910
2911
2912 static void con_close(struct tty_struct *tty, struct file *filp)
2913 {
2914         /* Nothing to do - we defer to shutdown */
2915 }
2916
2917 static void con_shutdown(struct tty_struct *tty)
2918 {
2919         struct vc_data *vc = tty->driver_data;
2920         BUG_ON(vc == NULL);
2921         console_lock();
2922         vc->port.tty = NULL;
2923         console_unlock();
2924 }
2925
2926 static int default_color           = 7; /* white */
2927 static int default_italic_color    = 2; // green (ASCII)
2928 static int default_underline_color = 3; // cyan (ASCII)
2929 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2930 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2931 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2932
2933 static void vc_init(struct vc_data *vc, unsigned int rows,
2934                     unsigned int cols, int do_clear)
2935 {
2936         int j, k ;
2937
2938         vc->vc_cols = cols;
2939         vc->vc_rows = rows;
2940         vc->vc_size_row = cols << 1;
2941         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2942
2943         set_origin(vc);
2944         vc->vc_pos = vc->vc_origin;
2945         reset_vc(vc);
2946         for (j=k=0; j<16; j++) {
2947                 vc->vc_palette[k++] = default_red[j] ;
2948                 vc->vc_palette[k++] = default_grn[j] ;
2949                 vc->vc_palette[k++] = default_blu[j] ;
2950         }
2951         vc->vc_def_color       = default_color;
2952         vc->vc_ulcolor         = default_underline_color;
2953         vc->vc_itcolor         = default_italic_color;
2954         vc->vc_halfcolor       = 0x08;   /* grey */
2955         init_waitqueue_head(&vc->paste_wait);
2956         reset_terminal(vc, do_clear);
2957 }
2958
2959 /*
2960  * This routine initializes console interrupts, and does nothing
2961  * else. If you want the screen to clear, call tty_write with
2962  * the appropriate escape-sequence.
2963  */
2964
2965 static int __init con_init(void)
2966 {
2967         const char *display_desc = NULL;
2968         struct vc_data *vc;
2969         unsigned int currcons = 0, i;
2970
2971         console_lock();
2972
2973         if (conswitchp)
2974                 display_desc = conswitchp->con_startup();
2975         if (!display_desc) {
2976                 fg_console = 0;
2977                 console_unlock();
2978                 return 0;
2979         }
2980
2981         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2982                 struct con_driver *con_driver = &registered_con_driver[i];
2983
2984                 if (con_driver->con == NULL) {
2985                         con_driver->con = conswitchp;
2986                         con_driver->desc = display_desc;
2987                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2988                         con_driver->first = 0;
2989                         con_driver->last = MAX_NR_CONSOLES - 1;
2990                         break;
2991                 }
2992         }
2993
2994         for (i = 0; i < MAX_NR_CONSOLES; i++)
2995                 con_driver_map[i] = conswitchp;
2996
2997         if (blankinterval) {
2998                 blank_state = blank_normal_wait;
2999                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3000         }
3001
3002         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3003                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3004                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3005                 tty_port_init(&vc->port);
3006                 visual_init(vc, currcons, 1);
3007                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3008                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3009                         currcons || !vc->vc_sw->con_save_screen);
3010         }
3011         currcons = fg_console = 0;
3012         master_display_fg = vc = vc_cons[currcons].d;
3013         set_origin(vc);
3014         save_screen(vc);
3015         gotoxy(vc, vc->vc_x, vc->vc_y);
3016         csi_J(vc, 0);
3017         update_screen(vc);
3018         pr_info("Console: %s %s %dx%d\n",
3019                 vc->vc_can_do_color ? "colour" : "mono",
3020                 display_desc, vc->vc_cols, vc->vc_rows);
3021         printable = 1;
3022
3023         console_unlock();
3024
3025 #ifdef CONFIG_VT_CONSOLE
3026         register_console(&vt_console_driver);
3027 #endif
3028         return 0;
3029 }
3030 console_initcall(con_init);
3031
3032 static const struct tty_operations con_ops = {
3033         .install = con_install,
3034         .open = con_open,
3035         .close = con_close,
3036         .write = con_write,
3037         .write_room = con_write_room,
3038         .put_char = con_put_char,
3039         .flush_chars = con_flush_chars,
3040         .chars_in_buffer = con_chars_in_buffer,
3041         .ioctl = vt_ioctl,
3042 #ifdef CONFIG_COMPAT
3043         .compat_ioctl = vt_compat_ioctl,
3044 #endif
3045         .stop = con_stop,
3046         .start = con_start,
3047         .throttle = con_throttle,
3048         .unthrottle = con_unthrottle,
3049         .resize = vt_resize,
3050         .shutdown = con_shutdown
3051 };
3052
3053 static struct cdev vc0_cdev;
3054
3055 static ssize_t show_tty_active(struct device *dev,
3056                                 struct device_attribute *attr, char *buf)
3057 {
3058         return sprintf(buf, "tty%d\n", fg_console + 1);
3059 }
3060 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3061
3062 static struct attribute *vt_dev_attrs[] = {
3063         &dev_attr_active.attr,
3064         NULL
3065 };
3066
3067 ATTRIBUTE_GROUPS(vt_dev);
3068
3069 int __init vty_init(const struct file_operations *console_fops)
3070 {
3071         cdev_init(&vc0_cdev, console_fops);
3072         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3073             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3074                 panic("Couldn't register /dev/tty0 driver\n");
3075         tty0dev = device_create_with_groups(tty_class, NULL,
3076                                             MKDEV(TTY_MAJOR, 0), NULL,
3077                                             vt_dev_groups, "tty0");
3078         if (IS_ERR(tty0dev))
3079                 tty0dev = NULL;
3080
3081         vcs_init();
3082
3083         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3084         if (!console_driver)
3085                 panic("Couldn't allocate console driver\n");
3086
3087         console_driver->name = "tty";
3088         console_driver->name_base = 1;
3089         console_driver->major = TTY_MAJOR;
3090         console_driver->minor_start = 1;
3091         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3092         console_driver->init_termios = tty_std_termios;
3093         if (default_utf8)
3094                 console_driver->init_termios.c_iflag |= IUTF8;
3095         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3096         tty_set_operations(console_driver, &con_ops);
3097         if (tty_register_driver(console_driver))
3098                 panic("Couldn't register console driver\n");
3099         kbd_init();
3100         console_map_init();
3101 #ifdef CONFIG_MDA_CONSOLE
3102         mda_console_init();
3103 #endif
3104         return 0;
3105 }
3106
3107 #ifndef VT_SINGLE_DRIVER
3108
3109 static struct class *vtconsole_class;
3110
3111 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3112                            int deflt)
3113 {
3114         struct module *owner = csw->owner;
3115         const char *desc = NULL;
3116         struct con_driver *con_driver;
3117         int i, j = -1, k = -1, retval = -ENODEV;
3118
3119         if (!try_module_get(owner))
3120                 return -ENODEV;
3121
3122         WARN_CONSOLE_UNLOCKED();
3123
3124         /* check if driver is registered */
3125         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3126                 con_driver = &registered_con_driver[i];
3127
3128                 if (con_driver->con == csw) {
3129                         desc = con_driver->desc;
3130                         retval = 0;
3131                         break;
3132                 }
3133         }
3134
3135         if (retval)
3136                 goto err;
3137
3138         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3139                 csw->con_startup();
3140                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3141         }
3142
3143         if (deflt) {
3144                 if (conswitchp)
3145                         module_put(conswitchp->owner);
3146
3147                 __module_get(owner);
3148                 conswitchp = csw;
3149         }
3150
3151         first = max(first, con_driver->first);
3152         last = min(last, con_driver->last);
3153
3154         for (i = first; i <= last; i++) {
3155                 int old_was_color;
3156                 struct vc_data *vc = vc_cons[i].d;
3157
3158                 if (con_driver_map[i])
3159                         module_put(con_driver_map[i]->owner);
3160                 __module_get(owner);
3161                 con_driver_map[i] = csw;
3162
3163                 if (!vc || !vc->vc_sw)
3164                         continue;
3165
3166                 j = i;
3167
3168                 if (con_is_visible(vc)) {
3169                         k = i;
3170                         save_screen(vc);
3171                 }
3172
3173                 old_was_color = vc->vc_can_do_color;
3174                 vc->vc_sw->con_deinit(vc);
3175                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3176                 visual_init(vc, i, 0);
3177                 set_origin(vc);
3178                 update_attr(vc);
3179
3180                 /* If the console changed between mono <-> color, then
3181                  * the attributes in the screenbuf will be wrong.  The
3182                  * following resets all attributes to something sane.
3183                  */
3184                 if (old_was_color != vc->vc_can_do_color)
3185                         clear_buffer_attributes(vc);
3186         }
3187
3188         pr_info("Console: switching ");
3189         if (!deflt)
3190                 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
3191         if (j >= 0) {
3192                 struct vc_data *vc = vc_cons[j].d;
3193
3194                 printk(KERN_CONT "to %s %s %dx%d\n",
3195                        vc->vc_can_do_color ? "colour" : "mono",
3196                        desc, vc->vc_cols, vc->vc_rows);
3197
3198                 if (k >= 0) {
3199                         vc = vc_cons[k].d;
3200                         update_screen(vc);
3201                 }
3202         } else
3203                 printk(KERN_CONT "to %s\n", desc);
3204
3205         retval = 0;
3206 err:
3207         module_put(owner);
3208         return retval;
3209 };
3210
3211
3212 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3213 /* unlocked version of unbind_con_driver() */
3214 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3215 {
3216         struct module *owner = csw->owner;
3217         const struct consw *defcsw = NULL;
3218         struct con_driver *con_driver = NULL, *con_back = NULL;
3219         int i, retval = -ENODEV;
3220
3221         if (!try_module_get(owner))
3222                 return -ENODEV;
3223
3224         WARN_CONSOLE_UNLOCKED();
3225
3226         /* check if driver is registered and if it is unbindable */
3227         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3228                 con_driver = &registered_con_driver[i];
3229
3230                 if (con_driver->con == csw &&
3231                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3232                         retval = 0;
3233                         break;
3234                 }
3235         }
3236
3237         if (retval)
3238                 goto err;
3239
3240         retval = -ENODEV;
3241
3242         /* check if backup driver exists */
3243         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3244                 con_back = &registered_con_driver[i];
3245
3246                 if (con_back->con && con_back->con != csw) {
3247                         defcsw = con_back->con;
3248                         retval = 0;
3249                         break;
3250                 }
3251         }
3252
3253         if (retval)
3254                 goto err;
3255
3256         if (!con_is_bound(csw))
3257                 goto err;
3258
3259         first = max(first, con_driver->first);
3260         last = min(last, con_driver->last);
3261
3262         for (i = first; i <= last; i++) {
3263                 if (con_driver_map[i] == csw) {
3264                         module_put(csw->owner);
3265                         con_driver_map[i] = NULL;
3266                 }
3267         }
3268
3269         if (!con_is_bound(defcsw)) {
3270                 const struct consw *defconsw = conswitchp;
3271
3272                 defcsw->con_startup();
3273                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3274                 /*
3275                  * vgacon may change the default driver to point
3276                  * to dummycon, we restore it here...
3277                  */
3278                 conswitchp = defconsw;
3279         }
3280
3281         if (!con_is_bound(csw))
3282                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3283
3284         /* ignore return value, binding should not fail */
3285         do_bind_con_driver(defcsw, first, last, deflt);
3286 err:
3287         module_put(owner);
3288         return retval;
3289
3290 }
3291 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3292
3293 static int vt_bind(struct con_driver *con)
3294 {
3295         const struct consw *defcsw = NULL, *csw = NULL;
3296         int i, more = 1, first = -1, last = -1, deflt = 0;
3297
3298         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3299                 goto err;
3300
3301         csw = con->con;
3302
3303         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3304                 struct con_driver *con = &registered_con_driver[i];
3305
3306                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3307                         defcsw = con->con;
3308                         break;
3309                 }
3310         }
3311
3312         if (!defcsw)
3313                 goto err;
3314
3315         while (more) {
3316                 more = 0;
3317
3318                 for (i = con->first; i <= con->last; i++) {
3319                         if (con_driver_map[i] == defcsw) {
3320                                 if (first == -1)
3321                                         first = i;
3322                                 last = i;
3323                                 more = 1;
3324                         } else if (first != -1)
3325                                 break;
3326                 }
3327
3328                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3329                         deflt = 1;
3330
3331                 if (first != -1)
3332                         do_bind_con_driver(csw, first, last, deflt);
3333
3334                 first = -1;
3335                 last = -1;
3336                 deflt = 0;
3337         }
3338
3339 err:
3340         return 0;
3341 }
3342
3343 static int vt_unbind(struct con_driver *con)
3344 {
3345         const struct consw *csw = NULL;
3346         int i, more = 1, first = -1, last = -1, deflt = 0;
3347         int ret;
3348
3349         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3350                 goto err;
3351
3352         csw = con->con;
3353
3354         while (more) {
3355                 more = 0;
3356
3357                 for (i = con->first; i <= con->last; i++) {
3358                         if (con_driver_map[i] == csw) {
3359                                 if (first == -1)
3360                                         first = i;
3361                                 last = i;
3362                                 more = 1;
3363                         } else if (first != -1)
3364                                 break;
3365                 }
3366
3367                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3368                         deflt = 1;
3369
3370                 if (first != -1) {
3371                         ret = do_unbind_con_driver(csw, first, last, deflt);
3372                         if (ret != 0)
3373                                 return ret;
3374                 }
3375
3376                 first = -1;
3377                 last = -1;
3378                 deflt = 0;
3379         }
3380
3381 err:
3382         return 0;
3383 }
3384 #else
3385 static inline int vt_bind(struct con_driver *con)
3386 {
3387         return 0;
3388 }
3389 static inline int vt_unbind(struct con_driver *con)
3390 {
3391         return 0;
3392 }
3393 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3394
3395 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3396                           const char *buf, size_t count)
3397 {
3398         struct con_driver *con = dev_get_drvdata(dev);
3399         int bind = simple_strtoul(buf, NULL, 0);
3400
3401         console_lock();
3402
3403         if (bind)
3404                 vt_bind(con);
3405         else
3406                 vt_unbind(con);
3407
3408         console_unlock();
3409
3410         return count;
3411 }
3412
3413 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3414                          char *buf)
3415 {
3416         struct con_driver *con = dev_get_drvdata(dev);
3417         int bind = con_is_bound(con->con);
3418
3419         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3420 }
3421
3422 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3423                          char *buf)
3424 {
3425         struct con_driver *con = dev_get_drvdata(dev);
3426
3427         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3428                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3429                          con->desc);
3430
3431 }
3432
3433 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3434 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3435
3436 static struct attribute *con_dev_attrs[] = {
3437         &dev_attr_bind.attr,
3438         &dev_attr_name.attr,
3439         NULL
3440 };
3441
3442 ATTRIBUTE_GROUPS(con_dev);
3443
3444 static int vtconsole_init_device(struct con_driver *con)
3445 {
3446         con->flag |= CON_DRIVER_FLAG_ATTR;
3447         return 0;
3448 }
3449
3450 static void vtconsole_deinit_device(struct con_driver *con)
3451 {
3452         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3453 }
3454
3455 /**
3456  * con_is_bound - checks if driver is bound to the console
3457  * @csw: console driver
3458  *
3459  * RETURNS: zero if unbound, nonzero if bound
3460  *
3461  * Drivers can call this and if zero, they should release
3462  * all resources allocated on con_startup()
3463  */
3464 int con_is_bound(const struct consw *csw)
3465 {
3466         int i, bound = 0;
3467
3468         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3469                 if (con_driver_map[i] == csw) {
3470                         bound = 1;
3471                         break;
3472                 }
3473         }
3474
3475         return bound;
3476 }
3477 EXPORT_SYMBOL(con_is_bound);
3478
3479 /**
3480  * con_debug_enter - prepare the console for the kernel debugger
3481  * @sw: console driver
3482  *
3483  * Called when the console is taken over by the kernel debugger, this
3484  * function needs to save the current console state, then put the console
3485  * into a state suitable for the kernel debugger.
3486  *
3487  * RETURNS:
3488  * Zero on success, nonzero if a failure occurred when trying to prepare
3489  * the console for the debugger.
3490  */
3491 int con_debug_enter(struct vc_data *vc)
3492 {
3493         int ret = 0;
3494
3495         saved_fg_console = fg_console;
3496         saved_last_console = last_console;
3497         saved_want_console = want_console;
3498         saved_vc_mode = vc->vc_mode;
3499         saved_console_blanked = console_blanked;
3500         vc->vc_mode = KD_TEXT;
3501         console_blanked = 0;
3502         if (vc->vc_sw->con_debug_enter)
3503                 ret = vc->vc_sw->con_debug_enter(vc);
3504 #ifdef CONFIG_KGDB_KDB
3505         /* Set the initial LINES variable if it is not already set */
3506         if (vc->vc_rows < 999) {
3507                 int linecount;
3508                 char lns[4];
3509                 const char *setargs[3] = {
3510                         "set",
3511                         "LINES",
3512                         lns,
3513                 };
3514                 if (kdbgetintenv(setargs[0], &linecount)) {
3515                         snprintf(lns, 4, "%i", vc->vc_rows);
3516                         kdb_set(2, setargs);
3517                 }
3518         }
3519         if (vc->vc_cols < 999) {
3520                 int colcount;
3521                 char cols[4];
3522                 const char *setargs[3] = {
3523                         "set",
3524                         "COLUMNS",
3525                         cols,
3526                 };
3527                 if (kdbgetintenv(setargs[0], &colcount)) {
3528                         snprintf(cols, 4, "%i", vc->vc_cols);
3529                         kdb_set(2, setargs);
3530                 }
3531         }
3532 #endif /* CONFIG_KGDB_KDB */
3533         return ret;
3534 }
3535 EXPORT_SYMBOL_GPL(con_debug_enter);
3536
3537 /**
3538  * con_debug_leave - restore console state
3539  * @sw: console driver
3540  *
3541  * Restore the console state to what it was before the kernel debugger
3542  * was invoked.
3543  *
3544  * RETURNS:
3545  * Zero on success, nonzero if a failure occurred when trying to restore
3546  * the console.
3547  */
3548 int con_debug_leave(void)
3549 {
3550         struct vc_data *vc;
3551         int ret = 0;
3552
3553         fg_console = saved_fg_console;
3554         last_console = saved_last_console;
3555         want_console = saved_want_console;
3556         console_blanked = saved_console_blanked;
3557         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3558
3559         vc = vc_cons[fg_console].d;
3560         if (vc->vc_sw->con_debug_leave)
3561                 ret = vc->vc_sw->con_debug_leave(vc);
3562         return ret;
3563 }
3564 EXPORT_SYMBOL_GPL(con_debug_leave);
3565
3566 static int do_register_con_driver(const struct consw *csw, int first, int last)
3567 {
3568         struct module *owner = csw->owner;
3569         struct con_driver *con_driver;
3570         const char *desc;
3571         int i, retval;
3572
3573         WARN_CONSOLE_UNLOCKED();
3574
3575         if (!try_module_get(owner))
3576                 return -ENODEV;
3577
3578         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3579                 con_driver = &registered_con_driver[i];
3580
3581                 /* already registered */
3582                 if (con_driver->con == csw) {
3583                         retval = -EBUSY;
3584                         goto err;
3585                 }
3586         }
3587
3588         desc = csw->con_startup();
3589         if (!desc) {
3590                 retval = -ENODEV;
3591                 goto err;
3592         }
3593
3594         retval = -EINVAL;
3595
3596         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3597                 con_driver = &registered_con_driver[i];
3598
3599                 if (con_driver->con == NULL &&
3600                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3601                         con_driver->con = csw;
3602                         con_driver->desc = desc;
3603                         con_driver->node = i;
3604                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3605                                            CON_DRIVER_FLAG_INIT;
3606                         con_driver->first = first;
3607                         con_driver->last = last;
3608                         retval = 0;
3609                         break;
3610                 }
3611         }
3612
3613         if (retval)
3614                 goto err;
3615
3616         con_driver->dev =
3617                 device_create_with_groups(vtconsole_class, NULL,
3618                                           MKDEV(0, con_driver->node),
3619                                           con_driver, con_dev_groups,
3620                                           "vtcon%i", con_driver->node);
3621         if (IS_ERR(con_driver->dev)) {
3622                 printk(KERN_WARNING "Unable to create device for %s; "
3623                        "errno = %ld\n", con_driver->desc,
3624                        PTR_ERR(con_driver->dev));
3625                 con_driver->dev = NULL;
3626         } else {
3627                 vtconsole_init_device(con_driver);
3628         }
3629
3630 err:
3631         module_put(owner);
3632         return retval;
3633 }
3634
3635
3636 /**
3637  * do_unregister_con_driver - unregister console driver from console layer
3638  * @csw: console driver
3639  *
3640  * DESCRIPTION: All drivers that registers to the console layer must
3641  * call this function upon exit, or if the console driver is in a state
3642  * where it won't be able to handle console services, such as the
3643  * framebuffer console without loaded framebuffer drivers.
3644  *
3645  * The driver must unbind first prior to unregistration.
3646  */
3647 int do_unregister_con_driver(const struct consw *csw)
3648 {
3649         int i;
3650
3651         /* cannot unregister a bound driver */
3652         if (con_is_bound(csw))
3653                 return -EBUSY;
3654
3655         if (csw == conswitchp)
3656                 return -EINVAL;
3657
3658         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3659                 struct con_driver *con_driver = &registered_con_driver[i];
3660
3661                 if (con_driver->con == csw) {
3662                         /*
3663                          * Defer the removal of the sysfs entries since that
3664                          * will acquire the kernfs s_active lock and we can't
3665                          * acquire this lock while holding the console lock:
3666                          * the unbind sysfs entry imposes already the opposite
3667                          * order. Reset con already here to prevent any later
3668                          * lookup to succeed and mark this slot as zombie, so
3669                          * it won't get reused until we complete the removal
3670                          * in the deferred work.
3671                          */
3672                         con_driver->con = NULL;
3673                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3674                         schedule_work(&con_driver_unregister_work);
3675
3676                         return 0;
3677                 }
3678         }
3679
3680         return -ENODEV;
3681 }
3682 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3683
3684 static void con_driver_unregister_callback(struct work_struct *ignored)
3685 {
3686         int i;
3687
3688         console_lock();
3689
3690         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3691                 struct con_driver *con_driver = &registered_con_driver[i];
3692
3693                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3694                         continue;
3695
3696                 console_unlock();
3697
3698                 vtconsole_deinit_device(con_driver);
3699                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3700
3701                 console_lock();
3702
3703                 if (WARN_ON_ONCE(con_driver->con))
3704                         con_driver->con = NULL;
3705                 con_driver->desc = NULL;
3706                 con_driver->dev = NULL;
3707                 con_driver->node = 0;
3708                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3709                 con_driver->flag = 0;
3710                 con_driver->first = 0;
3711                 con_driver->last = 0;
3712         }
3713
3714         console_unlock();
3715 }
3716
3717 /*
3718  *      If we support more console drivers, this function is used
3719  *      when a driver wants to take over some existing consoles
3720  *      and become default driver for newly opened ones.
3721  *
3722  *      do_take_over_console is basically a register followed by unbind
3723  */
3724 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3725 {
3726         int err;
3727
3728         err = do_register_con_driver(csw, first, last);
3729         /*
3730          * If we get an busy error we still want to bind the console driver
3731          * and return success, as we may have unbound the console driver
3732          * but not unregistered it.
3733          */
3734         if (err == -EBUSY)
3735                 err = 0;
3736         if (!err)
3737                 do_bind_con_driver(csw, first, last, deflt);
3738
3739         return err;
3740 }
3741 EXPORT_SYMBOL_GPL(do_take_over_console);
3742
3743
3744 /*
3745  * give_up_console is a wrapper to unregister_con_driver. It will only
3746  * work if driver is fully unbound.
3747  */
3748 void give_up_console(const struct consw *csw)
3749 {
3750         console_lock();
3751         do_unregister_con_driver(csw);
3752         console_unlock();
3753 }
3754
3755 static int __init vtconsole_class_init(void)
3756 {
3757         int i;
3758
3759         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3760         if (IS_ERR(vtconsole_class)) {
3761                 printk(KERN_WARNING "Unable to create vt console class; "
3762                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3763                 vtconsole_class = NULL;
3764         }
3765
3766         /* Add system drivers to sysfs */
3767         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3768                 struct con_driver *con = &registered_con_driver[i];
3769
3770                 if (con->con && !con->dev) {
3771                         con->dev =
3772                                 device_create_with_groups(vtconsole_class, NULL,
3773                                                           MKDEV(0, con->node),
3774                                                           con, con_dev_groups,
3775                                                           "vtcon%i", con->node);
3776
3777                         if (IS_ERR(con->dev)) {
3778                                 printk(KERN_WARNING "Unable to create "
3779                                        "device for %s; errno = %ld\n",
3780                                        con->desc, PTR_ERR(con->dev));
3781                                 con->dev = NULL;
3782                         } else {
3783                                 vtconsole_init_device(con);
3784                         }
3785                 }
3786         }
3787
3788         return 0;
3789 }
3790 postcore_initcall(vtconsole_class_init);
3791
3792 #endif
3793
3794 /*
3795  *      Screen blanking
3796  */
3797
3798 static int set_vesa_blanking(char __user *p)
3799 {
3800         unsigned int mode;
3801
3802         if (get_user(mode, p + 1))
3803                 return -EFAULT;
3804
3805         vesa_blank_mode = (mode < 4) ? mode : 0;
3806         return 0;
3807 }
3808
3809 void do_blank_screen(int entering_gfx)
3810 {
3811         struct vc_data *vc = vc_cons[fg_console].d;
3812         int i;
3813
3814         WARN_CONSOLE_UNLOCKED();
3815
3816         if (console_blanked) {
3817                 if (blank_state == blank_vesa_wait) {
3818                         blank_state = blank_off;
3819                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3820                 }
3821                 return;
3822         }
3823
3824         /* entering graphics mode? */
3825         if (entering_gfx) {
3826                 hide_cursor(vc);
3827                 save_screen(vc);
3828                 vc->vc_sw->con_blank(vc, -1, 1);
3829                 console_blanked = fg_console + 1;
3830                 blank_state = blank_off;
3831                 set_origin(vc);
3832                 return;
3833         }
3834
3835         if (blank_state != blank_normal_wait)
3836                 return;
3837         blank_state = blank_off;
3838
3839         /* don't blank graphics */
3840         if (vc->vc_mode != KD_TEXT) {
3841                 console_blanked = fg_console + 1;
3842                 return;
3843         }
3844
3845         hide_cursor(vc);
3846         del_timer_sync(&console_timer);
3847         blank_timer_expired = 0;
3848
3849         save_screen(vc);
3850         /* In case we need to reset origin, blanking hook returns 1 */
3851         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3852         console_blanked = fg_console + 1;
3853         if (i)
3854                 set_origin(vc);
3855
3856         if (console_blank_hook && console_blank_hook(1))
3857                 return;
3858
3859         if (vesa_off_interval && vesa_blank_mode) {
3860                 blank_state = blank_vesa_wait;
3861                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3862         }
3863         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3864 }
3865 EXPORT_SYMBOL(do_blank_screen);
3866
3867 /*
3868  * Called by timer as well as from vt_console_driver
3869  */
3870 void do_unblank_screen(int leaving_gfx)
3871 {
3872         struct vc_data *vc;
3873
3874         /* This should now always be called from a "sane" (read: can schedule)
3875          * context for the sake of the low level drivers, except in the special
3876          * case of oops_in_progress
3877          */
3878         if (!oops_in_progress)
3879                 might_sleep();
3880
3881         WARN_CONSOLE_UNLOCKED();
3882
3883         ignore_poke = 0;
3884         if (!console_blanked)
3885                 return;
3886         if (!vc_cons_allocated(fg_console)) {
3887                 /* impossible */
3888                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3889                         fg_console + 1);
3890                 return;
3891         }
3892         vc = vc_cons[fg_console].d;
3893         /* Try to unblank in oops case too */
3894         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3895                 return; /* but leave console_blanked != 0 */
3896
3897         if (blankinterval) {
3898                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3899                 blank_state = blank_normal_wait;
3900         }
3901
3902         console_blanked = 0;
3903         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3904                 /* Low-level driver cannot restore -> do it ourselves */
3905                 update_screen(vc);
3906         if (console_blank_hook)
3907                 console_blank_hook(0);
3908         set_palette(vc);
3909         set_cursor(vc);
3910         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3911 }
3912 EXPORT_SYMBOL(do_unblank_screen);
3913
3914 /*
3915  * This is called by the outside world to cause a forced unblank, mostly for
3916  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3917  * call it with 1 as an argument and so force a mode restore... that may kill
3918  * X or at least garbage the screen but would also make the Oops visible...
3919  */
3920 void unblank_screen(void)
3921 {
3922         do_unblank_screen(0);
3923 }
3924
3925 /*
3926  * We defer the timer blanking to work queue so it can take the console mutex
3927  * (console operations can still happen at irq time, but only from printk which
3928  * has the console mutex. Not perfect yet, but better than no locking
3929  */
3930 static void blank_screen_t(unsigned long dummy)
3931 {
3932         if (unlikely(!keventd_up())) {
3933                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3934                 return;
3935         }
3936         blank_timer_expired = 1;
3937         schedule_work(&console_work);
3938 }
3939
3940 void poke_blanked_console(void)
3941 {
3942         WARN_CONSOLE_UNLOCKED();
3943
3944         /* Add this so we quickly catch whoever might call us in a non
3945          * safe context. Nowadays, unblank_screen() isn't to be called in
3946          * atomic contexts and is allowed to schedule (with the special case
3947          * of oops_in_progress, but that isn't of any concern for this
3948          * function. --BenH.
3949          */
3950         might_sleep();
3951
3952         /* This isn't perfectly race free, but a race here would be mostly harmless,
3953          * at worse, we'll do a spurrious blank and it's unlikely
3954          */
3955         del_timer(&console_timer);
3956         blank_timer_expired = 0;
3957
3958         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3959                 return;
3960         if (console_blanked)
3961                 unblank_screen();
3962         else if (blankinterval) {
3963                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3964                 blank_state = blank_normal_wait;
3965         }
3966 }
3967
3968 /*
3969  *      Palettes
3970  */
3971
3972 static void set_palette(struct vc_data *vc)
3973 {
3974         WARN_CONSOLE_UNLOCKED();
3975
3976         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3977                 vc->vc_sw->con_set_palette(vc, color_table);
3978 }
3979
3980 /*
3981  * Load palette into the DAC registers. arg points to a colour
3982  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3983  */
3984
3985 int con_set_cmap(unsigned char __user *arg)
3986 {
3987         int i, j, k;
3988         unsigned char colormap[3*16];
3989
3990         if (copy_from_user(colormap, arg, sizeof(colormap)))
3991                 return -EFAULT;
3992
3993         console_lock();
3994         for (i = k = 0; i < 16; i++) {
3995                 default_red[i] = colormap[k++];
3996                 default_grn[i] = colormap[k++];
3997                 default_blu[i] = colormap[k++];
3998         }
3999         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4000                 if (!vc_cons_allocated(i))
4001                         continue;
4002                 for (j = k = 0; j < 16; j++) {
4003                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4004                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4005                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4006                 }
4007                 set_palette(vc_cons[i].d);
4008         }
4009         console_unlock();
4010
4011         return 0;
4012 }
4013
4014 int con_get_cmap(unsigned char __user *arg)
4015 {
4016         int i, k;
4017         unsigned char colormap[3*16];
4018
4019         console_lock();
4020         for (i = k = 0; i < 16; i++) {
4021                 colormap[k++] = default_red[i];
4022                 colormap[k++] = default_grn[i];
4023                 colormap[k++] = default_blu[i];
4024         }
4025         console_unlock();
4026
4027         if (copy_to_user(arg, colormap, sizeof(colormap)))
4028                 return -EFAULT;
4029
4030         return 0;
4031 }
4032
4033 void reset_palette(struct vc_data *vc)
4034 {
4035         int j, k;
4036         for (j=k=0; j<16; j++) {
4037                 vc->vc_palette[k++] = default_red[j];
4038                 vc->vc_palette[k++] = default_grn[j];
4039                 vc->vc_palette[k++] = default_blu[j];
4040         }
4041         set_palette(vc);
4042 }
4043
4044 /*
4045  *  Font switching
4046  *
4047  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4048  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4049  *  depending on width) reserved for each character which is kinda wasty, but
4050  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4051  *  is up to the actual low-level console-driver convert data into its favorite
4052  *  format (maybe we should add a `fontoffset' field to the `display'
4053  *  structure so we won't have to convert the fontdata all the time.
4054  *  /Jes
4055  */
4056
4057 #define max_font_size 65536
4058
4059 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4060 {
4061         struct console_font font;
4062         int rc = -EINVAL;
4063         int c;
4064
4065         if (op->data) {
4066                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4067                 if (!font.data)
4068                         return -ENOMEM;
4069         } else
4070                 font.data = NULL;
4071
4072         console_lock();
4073         if (vc->vc_mode != KD_TEXT)
4074                 rc = -EINVAL;
4075         else if (vc->vc_sw->con_font_get)
4076                 rc = vc->vc_sw->con_font_get(vc, &font);
4077         else
4078                 rc = -ENOSYS;
4079         console_unlock();
4080
4081         if (rc)
4082                 goto out;
4083
4084         c = (font.width+7)/8 * 32 * font.charcount;
4085
4086         if (op->data && font.charcount > op->charcount)
4087                 rc = -ENOSPC;
4088         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4089                 if (font.width > op->width || font.height > op->height)
4090                         rc = -ENOSPC;
4091         } else {
4092                 if (font.width != 8)
4093                         rc = -EIO;
4094                 else if ((op->height && font.height > op->height) ||
4095                          font.height > 32)
4096                         rc = -ENOSPC;
4097         }
4098         if (rc)
4099                 goto out;
4100
4101         op->height = font.height;
4102         op->width = font.width;
4103         op->charcount = font.charcount;
4104
4105         if (op->data && copy_to_user(op->data, font.data, c))
4106                 rc = -EFAULT;
4107
4108 out:
4109         kfree(font.data);
4110         return rc;
4111 }
4112
4113 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4114 {
4115         struct console_font font;
4116         int rc = -EINVAL;
4117         int size;
4118
4119         if (vc->vc_mode != KD_TEXT)
4120                 return -EINVAL;
4121         if (!op->data)
4122                 return -EINVAL;
4123         if (op->charcount > 512)
4124                 return -EINVAL;
4125         if (!op->height) {              /* Need to guess font height [compat] */
4126                 int h, i;
4127                 u8 __user *charmap = op->data;
4128                 u8 tmp;
4129
4130                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4131                    so that we can get rid of this soon */
4132                 if (!(op->flags & KD_FONT_FLAG_OLD))
4133                         return -EINVAL;
4134                 for (h = 32; h > 0; h--)
4135                         for (i = 0; i < op->charcount; i++) {
4136                                 if (get_user(tmp, &charmap[32*i+h-1]))
4137                                         return -EFAULT;
4138                                 if (tmp)
4139                                         goto nonzero;
4140                         }
4141                 return -EINVAL;
4142         nonzero:
4143                 op->height = h;
4144         }
4145         if (op->width <= 0 || op->width > 32 || op->height > 32)
4146                 return -EINVAL;
4147         size = (op->width+7)/8 * 32 * op->charcount;
4148         if (size > max_font_size)
4149                 return -ENOSPC;
4150         font.charcount = op->charcount;
4151         font.height = op->height;
4152         font.width = op->width;
4153         font.data = memdup_user(op->data, size);
4154         if (IS_ERR(font.data))
4155                 return PTR_ERR(font.data);
4156         console_lock();
4157         if (vc->vc_mode != KD_TEXT)
4158                 rc = -EINVAL;
4159         else if (vc->vc_sw->con_font_set)
4160                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4161         else
4162                 rc = -ENOSYS;
4163         console_unlock();
4164         kfree(font.data);
4165         return rc;
4166 }
4167
4168 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4169 {
4170         struct console_font font = {.width = op->width, .height = op->height};
4171         char name[MAX_FONT_NAME];
4172         char *s = name;
4173         int rc;
4174
4175
4176         if (!op->data)
4177                 s = NULL;
4178         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4179                 return -EFAULT;
4180         else
4181                 name[MAX_FONT_NAME - 1] = 0;
4182
4183         console_lock();
4184         if (vc->vc_mode != KD_TEXT) {
4185                 console_unlock();
4186                 return -EINVAL;
4187         }
4188         if (vc->vc_sw->con_font_default)
4189                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4190         else
4191                 rc = -ENOSYS;
4192         console_unlock();
4193         if (!rc) {
4194                 op->width = font.width;
4195                 op->height = font.height;
4196         }
4197         return rc;
4198 }
4199
4200 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4201 {
4202         int con = op->height;
4203         int rc;
4204
4205
4206         console_lock();
4207         if (vc->vc_mode != KD_TEXT)
4208                 rc = -EINVAL;
4209         else if (!vc->vc_sw->con_font_copy)
4210                 rc = -ENOSYS;
4211         else if (con < 0 || !vc_cons_allocated(con))
4212                 rc = -ENOTTY;
4213         else if (con == vc->vc_num)     /* nothing to do */
4214                 rc = 0;
4215         else
4216                 rc = vc->vc_sw->con_font_copy(vc, con);
4217         console_unlock();
4218         return rc;
4219 }
4220
4221 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4222 {
4223         switch (op->op) {
4224         case KD_FONT_OP_SET:
4225                 return con_font_set(vc, op);
4226         case KD_FONT_OP_GET:
4227                 return con_font_get(vc, op);
4228         case KD_FONT_OP_SET_DEFAULT:
4229                 return con_font_default(vc, op);
4230         case KD_FONT_OP_COPY:
4231                 return con_font_copy(vc, op);
4232         }
4233         return -ENOSYS;
4234 }
4235
4236 /*
4237  *      Interface exported to selection and vcs.
4238  */
4239
4240 /* used by selection */
4241 u16 screen_glyph(struct vc_data *vc, int offset)
4242 {
4243         u16 w = scr_readw(screenpos(vc, offset, 1));
4244         u16 c = w & 0xff;
4245
4246         if (w & vc->vc_hi_font_mask)
4247                 c |= 0x100;
4248         return c;
4249 }
4250 EXPORT_SYMBOL_GPL(screen_glyph);
4251
4252 /* used by vcs - note the word offset */
4253 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4254 {
4255         return screenpos(vc, 2 * w_offset, viewed);
4256 }
4257 EXPORT_SYMBOL_GPL(screen_pos);
4258
4259 void getconsxy(struct vc_data *vc, unsigned char *p)
4260 {
4261         p[0] = vc->vc_x;
4262         p[1] = vc->vc_y;
4263 }
4264
4265 void putconsxy(struct vc_data *vc, unsigned char *p)
4266 {
4267         hide_cursor(vc);
4268         gotoxy(vc, p[0], p[1]);
4269         set_cursor(vc);
4270 }
4271
4272 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4273 {
4274         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4275                 return softcursor_original;
4276         return scr_readw(org);
4277 }
4278
4279 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4280 {
4281         scr_writew(val, org);
4282         if ((unsigned long)org == vc->vc_pos) {
4283                 softcursor_original = -1;
4284                 add_softcursor(vc);
4285         }
4286 }
4287
4288 void vcs_scr_updated(struct vc_data *vc)
4289 {
4290         notify_update(vc);
4291 }
4292
4293 /*
4294  *      Visible symbols for modules
4295  */
4296
4297 EXPORT_SYMBOL(color_table);
4298 EXPORT_SYMBOL(default_red);
4299 EXPORT_SYMBOL(default_grn);
4300 EXPORT_SYMBOL(default_blu);
4301 EXPORT_SYMBOL(update_region);
4302 EXPORT_SYMBOL(redraw_screen);
4303 EXPORT_SYMBOL(vc_resize);
4304 EXPORT_SYMBOL(fg_console);
4305 EXPORT_SYMBOL(console_blank_hook);
4306 EXPORT_SYMBOL(console_blanked);
4307 EXPORT_SYMBOL(vc_cons);
4308 EXPORT_SYMBOL(global_cursor_default);
4309 #ifndef VT_SINGLE_DRIVER
4310 EXPORT_SYMBOL(give_up_console);
4311 #endif