kernel/drivers/tty/vt/vt.c

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