drivers/tty/vt/vt.c

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