drivers/tty/vt/vt.c

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