drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <g-hunt@ee.utah.edu>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21  *
  22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <poe@daimi.aau.dk>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <geert@linux-m68k.org>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <arno@usn.nl>
  39  *     - David Carter <carter@cs.bris.ac.uk>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111 #define CON_DRIVER_FLAG_ZOMBIE 8
 112
 113 struct con_driver {
 114         const struct consw *con;
 115         const char *desc;
 116         struct device *dev;
 117         int node;
 118         int first;
 119         int last;
 120         int flag;
 121 };
 122
 123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 124 const struct consw *conswitchp;
 125
 126 /* A bitmap for codes <32. A bit of 1 indicates that the code
 127  * corresponding to that bit number invokes some special action
 128  * (such as cursor movement) and should not be displayed as a
 129  * glyph unless the disp_ctrl mode is explicitly enabled.
 130  */
 131 #define CTRL_ACTION 0x0d00ff81
 132 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 133
 134 /*
 135  * Here is the default bell parameters: 750HZ, 1/8th of a second
 136  */
 137 #define DEFAULT_BELL_PITCH      750
 138 #define DEFAULT_BELL_DURATION   (HZ/8)
 139 #define DEFAULT_CURSOR_BLINK_MS 200
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void con_driver_unregister_callback(struct work_struct *ignored);
 159 static void blank_screen_t(unsigned long dummy);
 160 static void set_palette(struct vc_data *vc);
 161
 162 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 163
 164 static int printable;           /* Is console ready for printing? */
 165 int default_utf8 = true;
 166 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 167 int global_cursor_default = -1;
 168 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 169
 170 static int cur_default = CUR_DEFAULT;
 171 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 172
 173 /*
 174  * ignore_poke: don't unblank the screen when things are typed.  This is
 175  * mainly for the privacy of braille terminal users.
 176  */
 177 static int ignore_poke;
 178
 179 int do_poke_blanked_console;
 180 int console_blanked;
 181
 182 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 183 static int vesa_off_interval;
 184 static int blankinterval = 10*60;
 185 core_param(consoleblank, blankinterval, int, 0444);
 186
 187 static DECLARE_WORK(console_work, console_callback);
 188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 189
 190 /*
 191  * fg_console is the current virtual console,
 192  * last_console is the last used one,
 193  * want_console is the console we want to switch to,
 194  * saved_* variants are for save/restore around kernel debugger enter/leave
 195  */
 196 int fg_console;
 197 int last_console;
 198 int want_console = -1;
 199 static int saved_fg_console;
 200 static int saved_last_console;
 201 static int saved_want_console;
 202 static int saved_vc_mode;
 203 static int saved_console_blanked;
 204
 205 /*
 206  * For each existing display, we have a pointer to console currently visible
 207  * on that display, allowing consoles other than fg_console to be refreshed
 208  * appropriately. Unless the low-level driver supplies its own display_fg
 209  * variable, we use this one for the "master display".
 210  */
 211 static struct vc_data *master_display_fg;
 212
 213 /*
 214  * Unfortunately, we need to delay tty echo when we're currently writing to the
 215  * console since the code is (and always was) not re-entrant, so we schedule
 216  * all flip requests to process context with schedule-task() and run it from
 217  * console_callback().
 218  */
 219
 220 /*
 221  * For the same reason, we defer scrollback to the console callback.
 222  */
 223 static int scrollback_delta;
 224
 225 /*
 226  * Hook so that the power management routines can (un)blank
 227  * the console on our behalf.
 228  */
 229 int (*console_blank_hook)(int);
 230
 231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 232 static int blank_state;
 233 static int blank_timer_expired;
 234 enum {
 235         blank_off = 0,
 236         blank_normal_wait,
 237         blank_vesa_wait,
 238 };
 239
 240 /*
 241  * /sys/class/tty/tty0/
 242  *
 243  * the attribute 'active' contains the name of the current vc
 244  * console and it supports poll() to detect vc switches
 245  */
 246 static struct device *tty0dev;
 247
 248 /*
 249  * Notifier list for console events.
 250  */
 251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 252
 253 int register_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(register_vt_notifier);
 258
 259 int unregister_vt_notifier(struct notifier_block *nb)
 260 {
 261         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 262 }
 263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 264
 265 static void notify_write(struct vc_data *vc, unsigned int unicode)
 266 {
 267         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 269 }
 270
 271 static void notify_update(struct vc_data *vc)
 272 {
 273         struct vt_notifier_param param = { .vc = vc };
 274         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 275 }
 276 /*
 277  *      Low-Level Functions
 278  */
 279
 280 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 281 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 282
 283 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 284 {
 285         unsigned short *p;
 286
 287         if (!viewed)
 288                 p = (unsigned short *)(vc->vc_origin + offset);
 289         else if (!vc->vc_sw->con_screen_pos)
 290                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 291         else
 292                 p = vc->vc_sw->con_screen_pos(vc, offset);
 293         return p;
 294 }
 295
 296 /* Called  from the keyboard irq path.. */
 297 static inline void scrolldelta(int lines)
 298 {
 299         /* FIXME */
 300         /* scrolldelta needs some kind of consistency lock, but the BKL was
 301            and still is not protecting versus the scheduled back end */
 302         scrollback_delta += lines;
 303         schedule_console_callback();
 304 }
 305
 306 void schedule_console_callback(void)
 307 {
 308         schedule_work(&console_work);
 309 }
 310
 311 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 312 {
 313         unsigned short *d, *s;
 314
 315         if (t+nr >= b)
 316                 nr = b - t - 1;
 317         if (b > vc->vc_rows || t >= b || nr < 1)
 318                 return;
 319         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 320                 return;
 321         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 322         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 323         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 324         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 325                     vc->vc_size_row * nr);
 326 }
 327
 328 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 329 {
 330         unsigned short *s;
 331         unsigned int step;
 332
 333         if (t+nr >= b)
 334                 nr = b - t - 1;
 335         if (b > vc->vc_rows || t >= b || nr < 1)
 336                 return;
 337         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 338                 return;
 339         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 340         step = vc->vc_cols * nr;
 341         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 342         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 343 }
 344
 345 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 346 {
 347         unsigned int xx, yy, offset;
 348         u16 *p;
 349
 350         p = (u16 *) start;
 351         if (!vc->vc_sw->con_getxy) {
 352                 offset = (start - vc->vc_origin) / 2;
 353                 xx = offset % vc->vc_cols;
 354                 yy = offset / vc->vc_cols;
 355         } else {
 356                 int nxx, nyy;
 357                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 358                 xx = nxx; yy = nyy;
 359         }
 360         for(;;) {
 361                 u16 attrib = scr_readw(p) & 0xff00;
 362                 int startx = xx;
 363                 u16 *q = p;
 364                 while (xx < vc->vc_cols && count) {
 365                         if (attrib != (scr_readw(p) & 0xff00)) {
 366                                 if (p > q)
 367                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 368                                 startx = xx;
 369                                 q = p;
 370                                 attrib = scr_readw(p) & 0xff00;
 371                         }
 372                         p++;
 373                         xx++;
 374                         count--;
 375                 }
 376                 if (p > q)
 377                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 378                 if (!count)
 379                         break;
 380                 xx = 0;
 381                 yy++;
 382                 if (vc->vc_sw->con_getxy) {
 383                         p = (u16 *)start;
 384                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 385                 }
 386         }
 387 }
 388
 389 void update_region(struct vc_data *vc, unsigned long start, int count)
 390 {
 391         WARN_CONSOLE_UNLOCKED();
 392
 393         if (DO_UPDATE(vc)) {
 394                 hide_cursor(vc);
 395                 do_update_region(vc, start, count);
 396                 set_cursor(vc);
 397         }
 398 }
 399
 400 /* Structure of attributes is hardware-dependent */
 401
 402 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 403     u8 _underline, u8 _reverse, u8 _italic)
 404 {
 405         if (vc->vc_sw->con_build_attr)
 406                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 407                        _blink, _underline, _reverse, _italic);
 408
 409 /*
 410  * ++roman: I completely changed the attribute format for monochrome
 411  * mode (!can_do_color). The formerly used MDA (monochrome display
 412  * adapter) format didn't allow the combination of certain effects.
 413  * Now the attribute is just a bit vector:
 414  *  Bit 0..1: intensity (0..2)
 415  *  Bit 2   : underline
 416  *  Bit 3   : reverse
 417  *  Bit 7   : blink
 418  */
 419         {
 420         u8 a = _color;
 421         if (!vc->vc_can_do_color)
 422                 return _intensity |
 423                        (_italic ? 2 : 0) |
 424                        (_underline ? 4 : 0) |
 425                        (_reverse ? 8 : 0) |
 426                        (_blink ? 0x80 : 0);
 427         if (_italic)
 428                 a = (a & 0xF0) | vc->vc_itcolor;
 429         else if (_underline)
 430                 a = (a & 0xf0) | vc->vc_ulcolor;
 431         else if (_intensity == 0)
 432                 a = (a & 0xf0) | vc->vc_ulcolor;
 433         if (_reverse)
 434                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 435         if (_blink)
 436                 a ^= 0x80;
 437         if (_intensity == 2)
 438                 a ^= 0x08;
 439         if (vc->vc_hi_font_mask == 0x100)
 440                 a <<= 1;
 441         return a;
 442         }
 443 }
 444
 445 static void update_attr(struct vc_data *vc)
 446 {
 447         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 448                       vc->vc_blink, vc->vc_underline,
 449                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 450         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 451 }
 452
 453 /* Note: inverting the screen twice should revert to the original state */
 454 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 455 {
 456         unsigned short *p;
 457
 458         WARN_CONSOLE_UNLOCKED();
 459
 460         count /= 2;
 461         p = screenpos(vc, offset, viewed);
 462         if (vc->vc_sw->con_invert_region) {
 463                 vc->vc_sw->con_invert_region(vc, p, count);
 464         } else {
 465                 u16 *q = p;
 466                 int cnt = count;
 467                 u16 a;
 468
 469                 if (!vc->vc_can_do_color) {
 470                         while (cnt--) {
 471                             a = scr_readw(q);
 472                             a ^= 0x0800;
 473                             scr_writew(a, q);
 474                             q++;
 475                         }
 476                 } else if (vc->vc_hi_font_mask == 0x100) {
 477                         while (cnt--) {
 478                                 a = scr_readw(q);
 479                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 480                                 scr_writew(a, q);
 481                                 q++;
 482                         }
 483                 } else {
 484                         while (cnt--) {
 485                                 a = scr_readw(q);
 486                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 487                                 scr_writew(a, q);
 488                                 q++;
 489                         }
 490                 }
 491         }
 492
 493         if (DO_UPDATE(vc))
 494                 do_update_region(vc, (unsigned long) p, count);
 495         notify_update(vc);
 496 }
 497
 498 /* used by selection: complement pointer position */
 499 void complement_pos(struct vc_data *vc, int offset)
 500 {
 501         static int old_offset = -1;
 502         static unsigned short old;
 503         static unsigned short oldx, oldy;
 504
 505         WARN_CONSOLE_UNLOCKED();
 506
 507         if (old_offset != -1 && old_offset >= 0 &&
 508             old_offset < vc->vc_screenbuf_size) {
 509                 scr_writew(old, screenpos(vc, old_offset, 1));
 510                 if (DO_UPDATE(vc))
 511                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 512                 notify_update(vc);
 513         }
 514
 515         old_offset = offset;
 516
 517         if (offset != -1 && offset >= 0 &&
 518             offset < vc->vc_screenbuf_size) {
 519                 unsigned short new;
 520                 unsigned short *p;
 521                 p = screenpos(vc, offset, 1);
 522                 old = scr_readw(p);
 523                 new = old ^ vc->vc_complement_mask;
 524                 scr_writew(new, p);
 525                 if (DO_UPDATE(vc)) {
 526                         oldx = (offset >> 1) % vc->vc_cols;
 527                         oldy = (offset >> 1) / vc->vc_cols;
 528                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 529                 }
 530                 notify_update(vc);
 531         }
 532 }
 533
 534 static void insert_char(struct vc_data *vc, unsigned int nr)
 535 {
 536         unsigned short *p = (unsigned short *) vc->vc_pos;
 537
 538         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 539         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 540         vc->vc_need_wrap = 0;
 541         if (DO_UPDATE(vc))
 542                 do_update_region(vc, (unsigned long) p,
 543                         vc->vc_cols - vc->vc_x);
 544 }
 545
 546 static void delete_char(struct vc_data *vc, unsigned int nr)
 547 {
 548         unsigned short *p = (unsigned short *) vc->vc_pos;
 549
 550         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 551         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 552                         nr * 2);
 553         vc->vc_need_wrap = 0;
 554         if (DO_UPDATE(vc))
 555                 do_update_region(vc, (unsigned long) p,
 556                         vc->vc_cols - vc->vc_x);
 557 }
 558
 559 static int softcursor_original = -1;
 560
 561 static void add_softcursor(struct vc_data *vc)
 562 {
 563         int i = scr_readw((u16 *) vc->vc_pos);
 564         u32 type = vc->vc_cursor_type;
 565
 566         if (! (type & 0x10)) return;
 567         if (softcursor_original != -1) return;
 568         softcursor_original = i;
 569         i |= ((type >> 8) & 0xff00 );
 570         i ^= ((type) & 0xff00 );
 571         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 572         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 573         scr_writew(i, (u16 *) vc->vc_pos);
 574         if (DO_UPDATE(vc))
 575                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 576 }
 577
 578 static void hide_softcursor(struct vc_data *vc)
 579 {
 580         if (softcursor_original != -1) {
 581                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 582                 if (DO_UPDATE(vc))
 583                         vc->vc_sw->con_putc(vc, softcursor_original,
 584                                         vc->vc_y, vc->vc_x);
 585                 softcursor_original = -1;
 586         }
 587 }
 588
 589 static void hide_cursor(struct vc_data *vc)
 590 {
 591         if (vc == sel_cons)
 592                 clear_selection();
 593         vc->vc_sw->con_cursor(vc, CM_ERASE);
 594         hide_softcursor(vc);
 595 }
 596
 597 static void set_cursor(struct vc_data *vc)
 598 {
 599         if (!IS_FG(vc) || console_blanked ||
 600             vc->vc_mode == KD_GRAPHICS)
 601                 return;
 602         if (vc->vc_deccm) {
 603                 if (vc == sel_cons)
 604                         clear_selection();
 605                 add_softcursor(vc);
 606                 if ((vc->vc_cursor_type & 0x0f) != 1)
 607                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 608         } else
 609                 hide_cursor(vc);
 610 }
 611
 612 static void set_origin(struct vc_data *vc)
 613 {
 614         WARN_CONSOLE_UNLOCKED();
 615
 616         if (!CON_IS_VISIBLE(vc) ||
 617             !vc->vc_sw->con_set_origin ||
 618             !vc->vc_sw->con_set_origin(vc))
 619                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 620         vc->vc_visible_origin = vc->vc_origin;
 621         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 622         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 623 }
 624
 625 static void save_screen(struct vc_data *vc)
 626 {
 627         WARN_CONSOLE_UNLOCKED();
 628
 629         if (vc->vc_sw->con_save_screen)
 630                 vc->vc_sw->con_save_screen(vc);
 631 }
 632
 633 /*
 634  *      Redrawing of screen
 635  */
 636
 637 void clear_buffer_attributes(struct vc_data *vc)
 638 {
 639         unsigned short *p = (unsigned short *)vc->vc_origin;
 640         int count = vc->vc_screenbuf_size / 2;
 641         int mask = vc->vc_hi_font_mask | 0xff;
 642
 643         for (; count > 0; count--, p++) {
 644                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 645         }
 646 }
 647
 648 void redraw_screen(struct vc_data *vc, int is_switch)
 649 {
 650         int redraw = 0;
 651
 652         WARN_CONSOLE_UNLOCKED();
 653
 654         if (!vc) {
 655                 /* strange ... */
 656                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 657                 return;
 658         }
 659
 660         if (is_switch) {
 661                 struct vc_data *old_vc = vc_cons[fg_console].d;
 662                 if (old_vc == vc)
 663                         return;
 664                 if (!CON_IS_VISIBLE(vc))
 665                         redraw = 1;
 666                 *vc->vc_display_fg = vc;
 667                 fg_console = vc->vc_num;
 668                 hide_cursor(old_vc);
 669                 if (!CON_IS_VISIBLE(old_vc)) {
 670                         save_screen(old_vc);
 671                         set_origin(old_vc);
 672                 }
 673                 if (tty0dev)
 674                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 675         } else {
 676                 hide_cursor(vc);
 677                 redraw = 1;
 678         }
 679
 680         if (redraw) {
 681                 int update;
 682                 int old_was_color = vc->vc_can_do_color;
 683
 684                 set_origin(vc);
 685                 update = vc->vc_sw->con_switch(vc);
 686                 set_palette(vc);
 687                 /*
 688                  * If console changed from mono<->color, the best we can do
 689                  * is to clear the buffer attributes. As it currently stands,
 690                  * rebuilding new attributes from the old buffer is not doable
 691                  * without overly complex code.
 692                  */
 693                 if (old_was_color != vc->vc_can_do_color) {
 694                         update_attr(vc);
 695                         clear_buffer_attributes(vc);
 696                 }
 697
 698                 /* Forcibly update if we're panicing */
 699                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 700                     vt_force_oops_output(vc))
 701                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 702         }
 703         set_cursor(vc);
 704         if (is_switch) {
 705                 set_leds();
 706                 compute_shiftstate();
 707                 notify_update(vc);
 708         }
 709 }
 710
 711 /*
 712  *      Allocation, freeing and resizing of VTs.
 713  */
 714
 715 int vc_cons_allocated(unsigned int i)
 716 {
 717         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 718 }
 719
 720 static void visual_init(struct vc_data *vc, int num, int init)
 721 {
 722         /* ++Geert: vc->vc_sw->con_init determines console size */
 723         if (vc->vc_sw)
 724                 module_put(vc->vc_sw->owner);
 725         vc->vc_sw = conswitchp;
 726 #ifndef VT_SINGLE_DRIVER
 727         if (con_driver_map[num])
 728                 vc->vc_sw = con_driver_map[num];
 729 #endif
 730         __module_get(vc->vc_sw->owner);
 731         vc->vc_num = num;
 732         vc->vc_display_fg = &master_display_fg;
 733         if (vc->vc_uni_pagedir_loc)
 734                 con_free_unimap(vc);
 735         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 736         vc->vc_uni_pagedir = NULL;
 737         vc->vc_hi_font_mask = 0;
 738         vc->vc_complement_mask = 0;
 739         vc->vc_can_do_color = 0;
 740         vc->vc_panic_force_write = false;
 741         vc->vc_sw->con_init(vc, init);
 742         if (!vc->vc_complement_mask)
 743                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 744         vc->vc_s_complement_mask = vc->vc_complement_mask;
 745         vc->vc_size_row = vc->vc_cols << 1;
 746         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 747 }
 748
 749 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 750 {
 751         struct vt_notifier_param param;
 752         struct vc_data *vc;
 753
 754         WARN_CONSOLE_UNLOCKED();
 755
 756         if (currcons >= MAX_NR_CONSOLES)
 757                 return -ENXIO;
 758
 759         if (vc_cons[currcons].d)
 760                 return 0;
 761
 762         /* due to the granularity of kmalloc, we waste some memory here */
 763         /* the alloc is done in two steps, to optimize the common situation
 764            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 765         /* although the numbers above are not valid since long ago, the
 766            point is still up-to-date and the comment still has its value
 767            even if only as a historical artifact.  --mj, July 1998 */
 768         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 769         if (!vc)
 770                 return -ENOMEM;
 771
 772         vc_cons[currcons].d = vc;
 773         tty_port_init(&vc->port);
 774         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 775
 776         visual_init(vc, currcons, 1);
 777
 778         if (!*vc->vc_uni_pagedir_loc)
 779                 con_set_default_unimap(vc);
 780
 781         vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 782         if (!vc->vc_screenbuf)
 783                 goto err_free;
 784
 785         /* If no drivers have overridden us and the user didn't pass a
 786            boot option, default to displaying the cursor */
 787         if (global_cursor_default == -1)
 788                 global_cursor_default = 1;
 789
 790         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 791         vcs_make_sysfs(currcons);
 792         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 793
 794         return 0;
 795 err_free:
 796         kfree(vc);
 797         vc_cons[currcons].d = NULL;
 798         return -ENOMEM;
 799 }
 800
 801 static inline int resize_screen(struct vc_data *vc, int width, int height,
 802                                 int user)
 803 {
 804         /* Resizes the resolution of the display adapater */
 805         int err = 0;
 806
 807         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 808                 err = vc->vc_sw->con_resize(vc, width, height, user);
 809
 810         return err;
 811 }
 812
 813 /*
 814  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 815  * [this is to be used together with some user program
 816  * like resize that changes the hardware videomode]
 817  */
 818 #define VC_RESIZE_MAXCOL (32767)
 819 #define VC_RESIZE_MAXROW (32767)
 820
 821 /**
 822  *      vc_do_resize    -       resizing method for the tty
 823  *      @tty: tty being resized
 824  *      @real_tty: real tty (different to tty if a pty/tty pair)
 825  *      @vc: virtual console private data
 826  *      @cols: columns
 827  *      @lines: lines
 828  *
 829  *      Resize a virtual console, clipping according to the actual constraints.
 830  *      If the caller passes a tty structure then update the termios winsize
 831  *      information and perform any necessary signal handling.
 832  *
 833  *      Caller must hold the console semaphore. Takes the termios rwsem and
 834  *      ctrl_lock of the tty IFF a tty is passed.
 835  */
 836
 837 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 838                                 unsigned int cols, unsigned int lines)
 839 {
 840         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 841         unsigned long end;
 842         unsigned int old_rows, old_row_size;
 843         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 844         unsigned int user;
 845         unsigned short *newscreen;
 846
 847         WARN_CONSOLE_UNLOCKED();
 848
 849         if (!vc)
 850                 return -ENXIO;
 851
 852         user = vc->vc_resize_user;
 853         vc->vc_resize_user = 0;
 854
 855         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 856                 return -EINVAL;
 857
 858         new_cols = (cols ? cols : vc->vc_cols);
 859         new_rows = (lines ? lines : vc->vc_rows);
 860         new_row_size = new_cols << 1;
 861         new_screen_size = new_row_size * new_rows;
 862
 863         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 864                 return 0;
 865
 866         newscreen = kmalloc(new_screen_size, GFP_USER);
 867         if (!newscreen)
 868                 return -ENOMEM;
 869
 870         old_rows = vc->vc_rows;
 871         old_row_size = vc->vc_size_row;
 872
 873         err = resize_screen(vc, new_cols, new_rows, user);
 874         if (err) {
 875                 kfree(newscreen);
 876                 return err;
 877         }
 878
 879         vc->vc_rows = new_rows;
 880         vc->vc_cols = new_cols;
 881         vc->vc_size_row = new_row_size;
 882         vc->vc_screenbuf_size = new_screen_size;
 883
 884         rlth = min(old_row_size, new_row_size);
 885         rrem = new_row_size - rlth;
 886         old_origin = vc->vc_origin;
 887         new_origin = (long) newscreen;
 888         new_scr_end = new_origin + new_screen_size;
 889
 890         if (vc->vc_y > new_rows) {
 891                 if (old_rows - vc->vc_y < new_rows) {
 892                         /*
 893                          * Cursor near the bottom, copy contents from the
 894                          * bottom of buffer
 895                          */
 896                         old_origin += (old_rows - new_rows) * old_row_size;
 897                 } else {
 898                         /*
 899                          * Cursor is in no man's land, copy 1/2 screenful
 900                          * from the top and bottom of cursor position
 901                          */
 902                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 903                 }
 904         }
 905
 906         end = old_origin + old_row_size * min(old_rows, new_rows);
 907
 908         update_attr(vc);
 909
 910         while (old_origin < end) {
 911                 scr_memcpyw((unsigned short *) new_origin,
 912                             (unsigned short *) old_origin, rlth);
 913                 if (rrem)
 914                         scr_memsetw((void *)(new_origin + rlth),
 915                                     vc->vc_video_erase_char, rrem);
 916                 old_origin += old_row_size;
 917                 new_origin += new_row_size;
 918         }
 919         if (new_scr_end > new_origin)
 920                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 921                             new_scr_end - new_origin);
 922         kfree(vc->vc_screenbuf);
 923         vc->vc_screenbuf = newscreen;
 924         vc->vc_screenbuf_size = new_screen_size;
 925         set_origin(vc);
 926
 927         /* do part of a reset_terminal() */
 928         vc->vc_top = 0;
 929         vc->vc_bottom = vc->vc_rows;
 930         gotoxy(vc, vc->vc_x, vc->vc_y);
 931         save_cur(vc);
 932
 933         if (tty) {
 934                 /* Rewrite the requested winsize data with the actual
 935                    resulting sizes */
 936                 struct winsize ws;
 937                 memset(&ws, 0, sizeof(ws));
 938                 ws.ws_row = vc->vc_rows;
 939                 ws.ws_col = vc->vc_cols;
 940                 ws.ws_ypixel = vc->vc_scan_lines;
 941                 tty_do_resize(tty, &ws);
 942         }
 943
 944         if (CON_IS_VISIBLE(vc))
 945                 update_screen(vc);
 946         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 947         return err;
 948 }
 949
 950 /**
 951  *      vc_resize               -       resize a VT
 952  *      @vc: virtual console
 953  *      @cols: columns
 954  *      @rows: rows
 955  *
 956  *      Resize a virtual console as seen from the console end of things. We
 957  *      use the common vc_do_resize methods to update the structures. The
 958  *      caller must hold the console sem to protect console internals and
 959  *      vc->port.tty
 960  */
 961
 962 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 963 {
 964         return vc_do_resize(vc->port.tty, vc, cols, rows);
 965 }
 966
 967 /**
 968  *      vt_resize               -       resize a VT
 969  *      @tty: tty to resize
 970  *      @ws: winsize attributes
 971  *
 972  *      Resize a virtual terminal. This is called by the tty layer as we
 973  *      register our own handler for resizing. The mutual helper does all
 974  *      the actual work.
 975  *
 976  *      Takes the console sem and the called methods then take the tty
 977  *      termios_rwsem and the tty ctrl_lock in that order.
 978  */
 979 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 980 {
 981         struct vc_data *vc = tty->driver_data;
 982         int ret;
 983
 984         console_lock();
 985         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 986         console_unlock();
 987         return ret;
 988 }
 989
 990 struct vc_data *vc_deallocate(unsigned int currcons)
 991 {
 992         struct vc_data *vc = NULL;
 993
 994         WARN_CONSOLE_UNLOCKED();
 995
 996         if (vc_cons_allocated(currcons)) {
 997                 struct vt_notifier_param param;
 998
 999                 param.vc = vc = vc_cons[currcons].d;
1000                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1001                 vcs_remove_sysfs(currcons);
1002                 vc->vc_sw->con_deinit(vc);
1003                 put_pid(vc->vt_pid);
1004                 module_put(vc->vc_sw->owner);
1005                 kfree(vc->vc_screenbuf);
1006                 vc_cons[currcons].d = NULL;
1007         }
1008         return vc;
1009 }
1010
1011 /*
1012  *      VT102 emulator
1013  */
1014
1015 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1016 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1017 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1018
1019 #define decarm          VC_REPEAT
1020 #define decckm          VC_CKMODE
1021 #define kbdapplic       VC_APPLIC
1022 #define lnm             VC_CRLF
1023
1024 /*
1025  * this is what the terminal answers to a ESC-Z or csi0c query.
1026  */
1027 #define VT100ID "\033[?1;2c"
1028 #define VT102ID "\033[?6c"
1029
1030 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1031                                        8,12,10,14, 9,13,11,15 };
1032
1033 /* the default colour table, for VGA+ colour systems */
1034 unsigned char default_red[] = {
1035         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1036         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1037 };
1038 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1039
1040 unsigned char default_grn[] = {
1041         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1042         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1043 };
1044 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1045
1046 unsigned char default_blu[] = {
1047         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1048         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1049 };
1050 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1051
1052 /*
1053  * gotoxy() must verify all boundaries, because the arguments
1054  * might also be negative. If the given position is out of
1055  * bounds, the cursor is placed at the nearest margin.
1056  */
1057 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1058 {
1059         int min_y, max_y;
1060
1061         if (new_x < 0)
1062                 vc->vc_x = 0;
1063         else {
1064                 if (new_x >= vc->vc_cols)
1065                         vc->vc_x = vc->vc_cols - 1;
1066                 else
1067                         vc->vc_x = new_x;
1068         }
1069
1070         if (vc->vc_decom) {
1071                 min_y = vc->vc_top;
1072                 max_y = vc->vc_bottom;
1073         } else {
1074                 min_y = 0;
1075                 max_y = vc->vc_rows;
1076         }
1077         if (new_y < min_y)
1078                 vc->vc_y = min_y;
1079         else if (new_y >= max_y)
1080                 vc->vc_y = max_y - 1;
1081         else
1082                 vc->vc_y = new_y;
1083         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1084         vc->vc_need_wrap = 0;
1085 }
1086
1087 /* for absolute user moves, when decom is set */
1088 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1089 {
1090         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1091 }
1092
1093 void scrollback(struct vc_data *vc)
1094 {
1095         scrolldelta(-(vc->vc_rows / 2));
1096 }
1097
1098 void scrollfront(struct vc_data *vc, int lines)
1099 {
1100         if (!lines)
1101                 lines = vc->vc_rows / 2;
1102         scrolldelta(lines);
1103 }
1104
1105 static void lf(struct vc_data *vc)
1106 {
1107         /* don't scroll if above bottom of scrolling region, or
1108          * if below scrolling region
1109          */
1110         if (vc->vc_y + 1 == vc->vc_bottom)
1111                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1112         else if (vc->vc_y < vc->vc_rows - 1) {
1113                 vc->vc_y++;
1114                 vc->vc_pos += vc->vc_size_row;
1115         }
1116         vc->vc_need_wrap = 0;
1117         notify_write(vc, '\n');
1118 }
1119
1120 static void ri(struct vc_data *vc)
1121 {
1122         /* don't scroll if below top of scrolling region, or
1123          * if above scrolling region
1124          */
1125         if (vc->vc_y == vc->vc_top)
1126                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1127         else if (vc->vc_y > 0) {
1128                 vc->vc_y--;
1129                 vc->vc_pos -= vc->vc_size_row;
1130         }
1131         vc->vc_need_wrap = 0;
1132 }
1133
1134 static inline void cr(struct vc_data *vc)
1135 {
1136         vc->vc_pos -= vc->vc_x << 1;
1137         vc->vc_need_wrap = vc->vc_x = 0;
1138         notify_write(vc, '\r');
1139 }
1140
1141 static inline void bs(struct vc_data *vc)
1142 {
1143         if (vc->vc_x) {
1144                 vc->vc_pos -= 2;
1145                 vc->vc_x--;
1146                 vc->vc_need_wrap = 0;
1147                 notify_write(vc, '\b');
1148         }
1149 }
1150
1151 static inline void del(struct vc_data *vc)
1152 {
1153         /* ignored */
1154 }
1155
1156 static void csi_J(struct vc_data *vc, int vpar)
1157 {
1158         unsigned int count;
1159         unsigned short * start;
1160
1161         switch (vpar) {
1162                 case 0: /* erase from cursor to end of display */
1163                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1164                         start = (unsigned short *)vc->vc_pos;
1165                         break;
1166                 case 1: /* erase from start to cursor */
1167                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1168                         start = (unsigned short *)vc->vc_origin;
1169                         break;
1170                 case 3: /* erase scroll-back buffer (and whole display) */
1171                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1172                                     vc->vc_screenbuf_size >> 1);
1173                         set_origin(vc);
1174                         if (CON_IS_VISIBLE(vc))
1175                                 update_screen(vc);
1176                         /* fall through */
1177                 case 2: /* erase whole display */
1178                         count = vc->vc_cols * vc->vc_rows;
1179                         start = (unsigned short *)vc->vc_origin;
1180                         break;
1181                 default:
1182                         return;
1183         }
1184         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1185         if (DO_UPDATE(vc))
1186                 do_update_region(vc, (unsigned long) start, count);
1187         vc->vc_need_wrap = 0;
1188 }
1189
1190 static void csi_K(struct vc_data *vc, int vpar)
1191 {
1192         unsigned int count;
1193         unsigned short * start;
1194
1195         switch (vpar) {
1196                 case 0: /* erase from cursor to end of line */
1197                         count = vc->vc_cols - vc->vc_x;
1198                         start = (unsigned short *)vc->vc_pos;
1199                         break;
1200                 case 1: /* erase from start of line to cursor */
1201                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1202                         count = vc->vc_x + 1;
1203                         break;
1204                 case 2: /* erase whole line */
1205                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1206                         count = vc->vc_cols;
1207                         break;
1208                 default:
1209                         return;
1210         }
1211         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1212         vc->vc_need_wrap = 0;
1213         if (DO_UPDATE(vc))
1214                 do_update_region(vc, (unsigned long) start, count);
1215 }
1216
1217 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1218 {                                         /* not vt100? */
1219         int count;
1220
1221         if (!vpar)
1222                 vpar++;
1223         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1224
1225         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1226         if (DO_UPDATE(vc))
1227                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1228         vc->vc_need_wrap = 0;
1229 }
1230
1231 static void default_attr(struct vc_data *vc)
1232 {
1233         vc->vc_intensity = 1;
1234         vc->vc_italic = 0;
1235         vc->vc_underline = 0;
1236         vc->vc_reverse = 0;
1237         vc->vc_blink = 0;
1238         vc->vc_color = vc->vc_def_color;
1239 }
1240
1241 struct rgb { u8 r; u8 g; u8 b; };
1242
1243 static void rgb_from_256(int i, struct rgb *c)
1244 {
1245         if (i < 8) {            /* Standard colours. */
1246                 c->r = i&1 ? 0xaa : 0x00;
1247                 c->g = i&2 ? 0xaa : 0x00;
1248                 c->b = i&4 ? 0xaa : 0x00;
1249         } else if (i < 16) {
1250                 c->r = i&1 ? 0xff : 0x55;
1251                 c->g = i&2 ? 0xff : 0x55;
1252                 c->b = i&4 ? 0xff : 0x55;
1253         } else if (i < 232) {   /* 6x6x6 colour cube. */
1254                 c->r = (i - 16) / 36 * 85 / 2;
1255                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1256                 c->b = (i - 16) % 6 * 85 / 2;
1257         } else                  /* Grayscale ramp. */
1258                 c->r = c->g = c->b = i * 10 - 2312;
1259 }
1260
1261 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1262 {
1263         u8 hue = 0, max = max3(c->r, c->g, c->b);
1264
1265         if (c->r > max / 2)
1266                 hue |= 4;
1267         if (c->g > max / 2)
1268                 hue |= 2;
1269         if (c->b > max / 2)
1270                 hue |= 1;
1271
1272         if (hue == 7 && max <= 0x55) {
1273                 hue = 0;
1274                 vc->vc_intensity = 2;
1275         } else if (max > 0xaa)
1276                 vc->vc_intensity = 2;
1277         else
1278                 vc->vc_intensity = 1;
1279
1280         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1281 }
1282
1283 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1284 {
1285         /* For backgrounds, err on the dark side. */
1286         vc->vc_color = (vc->vc_color & 0x0f)
1287                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1288 }
1289
1290 /*
1291  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1292  * and thus need to be detected and ignored by hand. Strictly speaking, that
1293  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1294  * no one produces such codes and almost no one accepts them.
1295  *
1296  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1297  * supporting them.
1298  */
1299 static int vc_t416_color(struct vc_data *vc, int i,
1300                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1301 {
1302         struct rgb c;
1303
1304         i++;
1305         if (i > vc->vc_npar)
1306                 return i;
1307
1308         if (vc->vc_par[i] == 5 && i < vc->vc_npar) {
1309                 /* 256 colours -- ubiquitous */
1310                 i++;
1311                 rgb_from_256(vc->vc_par[i], &c);
1312         } else if (vc->vc_par[i] == 2 && i <= vc->vc_npar + 3) {
1313                 /* 24 bit -- extremely rare */
1314                 c.r = vc->vc_par[i + 1];
1315                 c.g = vc->vc_par[i + 2];
1316                 c.b = vc->vc_par[i + 3];
1317                 i += 3;
1318         } else
1319                 return i;
1320
1321         set_color(vc, &c);
1322
1323         return i;
1324 }
1325
1326 /* console_lock is held */
1327 static void csi_m(struct vc_data *vc)
1328 {
1329         int i;
1330
1331         for (i = 0; i <= vc->vc_npar; i++)
1332                 switch (vc->vc_par[i]) {
1333                 case 0: /* all attributes off */
1334                         default_attr(vc);
1335                         break;
1336                 case 1:
1337                         vc->vc_intensity = 2;
1338                         break;
1339                 case 2:
1340                         vc->vc_intensity = 0;
1341                         break;
1342                 case 3:
1343                         vc->vc_italic = 1;
1344                         break;
1345                 case 4:
1346                         vc->vc_underline = 1;
1347                         break;
1348                 case 5:
1349                         vc->vc_blink = 1;
1350                         break;
1351                 case 7:
1352                         vc->vc_reverse = 1;
1353                         break;
1354                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1355                           * Select primary font, don't display control chars if
1356                           * defined, don't set bit 8 on output.
1357                           */
1358                         vc->vc_translate = set_translate(vc->vc_charset == 0
1359                                         ? vc->vc_G0_charset
1360                                         : vc->vc_G1_charset, vc);
1361                         vc->vc_disp_ctrl = 0;
1362                         vc->vc_toggle_meta = 0;
1363                         break;
1364                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1365                           * Select first alternate font, lets chars < 32 be
1366                           * displayed as ROM chars.
1367                           */
1368                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1369                         vc->vc_disp_ctrl = 1;
1370                         vc->vc_toggle_meta = 0;
1371                         break;
1372                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1373                           * Select second alternate font, toggle high bit
1374                           * before displaying as ROM char.
1375                           */
1376                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1377                         vc->vc_disp_ctrl = 1;
1378                         vc->vc_toggle_meta = 1;
1379                         break;
1380                 case 21:
1381                 case 22:
1382                         vc->vc_intensity = 1;
1383                         break;
1384                 case 23:
1385                         vc->vc_italic = 0;
1386                         break;
1387                 case 24:
1388                         vc->vc_underline = 0;
1389                         break;
1390                 case 25:
1391                         vc->vc_blink = 0;
1392                         break;
1393                 case 27:
1394                         vc->vc_reverse = 0;
1395                         break;
1396                 case 38:
1397                         i = vc_t416_color(vc, i, rgb_foreground);
1398                         break;
1399                 case 48:
1400                         i = vc_t416_color(vc, i, rgb_background);
1401                         break;
1402                 case 39:
1403                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1404                                 (vc->vc_color & 0xf0);
1405                         break;
1406                 case 49:
1407                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1408                                 (vc->vc_color & 0x0f);
1409                         break;
1410                 default:
1411                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1412                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1413                                         | (vc->vc_color & 0xf0);
1414                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1415                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1416                                         | (vc->vc_color & 0x0f);
1417                         break;
1418                 }
1419         update_attr(vc);
1420 }
1421
1422 static void respond_string(const char *p, struct tty_port *port)
1423 {
1424         while (*p) {
1425                 tty_insert_flip_char(port, *p, 0);
1426                 p++;
1427         }
1428         tty_schedule_flip(port);
1429 }
1430
1431 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1432 {
1433         char buf[40];
1434
1435         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1436         respond_string(buf, tty->port);
1437 }
1438
1439 static inline void status_report(struct tty_struct *tty)
1440 {
1441         respond_string("\033[0n", tty->port);   /* Terminal ok */
1442 }
1443
1444 static inline void respond_ID(struct tty_struct *tty)
1445 {
1446         respond_string(VT102ID, tty->port);
1447 }
1448
1449 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1450 {
1451         char buf[8];
1452
1453         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1454                 (char)('!' + mry));
1455         respond_string(buf, tty->port);
1456 }
1457
1458 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1459 int mouse_reporting(void)
1460 {
1461         return vc_cons[fg_console].d->vc_report_mouse;
1462 }
1463
1464 /* console_lock is held */
1465 static void set_mode(struct vc_data *vc, int on_off)
1466 {
1467         int i;
1468
1469         for (i = 0; i <= vc->vc_npar; i++)
1470                 if (vc->vc_ques) {
1471                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1472                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1473                                 if (on_off)
1474                                         set_kbd(vc, decckm);
1475                                 else
1476                                         clr_kbd(vc, decckm);
1477                                 break;
1478                         case 3: /* 80/132 mode switch unimplemented */
1479                                 vc->vc_deccolm = on_off;
1480 #if 0
1481                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1482                                 /* this alone does not suffice; some user mode
1483                                    utility has to change the hardware regs */
1484 #endif
1485                                 break;
1486                         case 5:                 /* Inverted screen on/off */
1487                                 if (vc->vc_decscnm != on_off) {
1488                                         vc->vc_decscnm = on_off;
1489                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1490                                         update_attr(vc);
1491                                 }
1492                                 break;
1493                         case 6:                 /* Origin relative/absolute */
1494                                 vc->vc_decom = on_off;
1495                                 gotoxay(vc, 0, 0);
1496                                 break;
1497                         case 7:                 /* Autowrap on/off */
1498                                 vc->vc_decawm = on_off;
1499                                 break;
1500                         case 8:                 /* Autorepeat on/off */
1501                                 if (on_off)
1502                                         set_kbd(vc, decarm);
1503                                 else
1504                                         clr_kbd(vc, decarm);
1505                                 break;
1506                         case 9:
1507                                 vc->vc_report_mouse = on_off ? 1 : 0;
1508                                 break;
1509                         case 25:                /* Cursor on/off */
1510                                 vc->vc_deccm = on_off;
1511                                 break;
1512                         case 1000:
1513                                 vc->vc_report_mouse = on_off ? 2 : 0;
1514                                 break;
1515                         }
1516                 } else {
1517                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1518                         case 3:                 /* Monitor (display ctrls) */
1519                                 vc->vc_disp_ctrl = on_off;
1520                                 break;
1521                         case 4:                 /* Insert Mode on/off */
1522                                 vc->vc_decim = on_off;
1523                                 break;
1524                         case 20:                /* Lf, Enter == CrLf/Lf */
1525                                 if (on_off)
1526                                         set_kbd(vc, lnm);
1527                                 else
1528                                         clr_kbd(vc, lnm);
1529                                 break;
1530                         }
1531                 }
1532 }
1533
1534 /* console_lock is held */
1535 static void setterm_command(struct vc_data *vc)
1536 {
1537         switch(vc->vc_par[0]) {
1538                 case 1: /* set color for underline mode */
1539                         if (vc->vc_can_do_color &&
1540                                         vc->vc_par[1] < 16) {
1541                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1542                                 if (vc->vc_underline)
1543                                         update_attr(vc);
1544                         }
1545                         break;
1546                 case 2: /* set color for half intensity mode */
1547                         if (vc->vc_can_do_color &&
1548                                         vc->vc_par[1] < 16) {
1549                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1550                                 if (vc->vc_intensity == 0)
1551                                         update_attr(vc);
1552                         }
1553                         break;
1554                 case 8: /* store colors as defaults */
1555                         vc->vc_def_color = vc->vc_attr;
1556                         if (vc->vc_hi_font_mask == 0x100)
1557                                 vc->vc_def_color >>= 1;
1558                         default_attr(vc);
1559                         update_attr(vc);
1560                         break;
1561                 case 9: /* set blanking interval */
1562                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1563                         poke_blanked_console();
1564                         break;
1565                 case 10: /* set bell frequency in Hz */
1566                         if (vc->vc_npar >= 1)
1567                                 vc->vc_bell_pitch = vc->vc_par[1];
1568                         else
1569                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1570                         break;
1571                 case 11: /* set bell duration in msec */
1572                         if (vc->vc_npar >= 1)
1573                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1574                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1575                         else
1576                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1577                         break;
1578                 case 12: /* bring specified console to the front */
1579                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1580                                 set_console(vc->vc_par[1] - 1);
1581                         break;
1582                 case 13: /* unblank the screen */
1583                         poke_blanked_console();
1584                         break;
1585                 case 14: /* set vesa powerdown interval */
1586                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1587                         break;
1588                 case 15: /* activate the previous console */
1589                         set_console(last_console);
1590                         break;
1591                 case 16: /* set cursor blink duration in msec */
1592                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1593                                         vc->vc_par[1] <= USHRT_MAX)
1594                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1595                         else
1596                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1597                         break;
1598         }
1599 }
1600
1601 /* console_lock is held */
1602 static void csi_at(struct vc_data *vc, unsigned int nr)
1603 {
1604         if (nr > vc->vc_cols - vc->vc_x)
1605                 nr = vc->vc_cols - vc->vc_x;
1606         else if (!nr)
1607                 nr = 1;
1608         insert_char(vc, nr);
1609 }
1610
1611 /* console_lock is held */
1612 static void csi_L(struct vc_data *vc, unsigned int nr)
1613 {
1614         if (nr > vc->vc_rows - vc->vc_y)
1615                 nr = vc->vc_rows - vc->vc_y;
1616         else if (!nr)
1617                 nr = 1;
1618         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1619         vc->vc_need_wrap = 0;
1620 }
1621
1622 /* console_lock is held */
1623 static void csi_P(struct vc_data *vc, unsigned int nr)
1624 {
1625         if (nr > vc->vc_cols - vc->vc_x)
1626                 nr = vc->vc_cols - vc->vc_x;
1627         else if (!nr)
1628                 nr = 1;
1629         delete_char(vc, nr);
1630 }
1631
1632 /* console_lock is held */
1633 static void csi_M(struct vc_data *vc, unsigned int nr)
1634 {
1635         if (nr > vc->vc_rows - vc->vc_y)
1636                 nr = vc->vc_rows - vc->vc_y;
1637         else if (!nr)
1638                 nr=1;
1639         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1640         vc->vc_need_wrap = 0;
1641 }
1642
1643 /* console_lock is held (except via vc_init->reset_terminal */
1644 static void save_cur(struct vc_data *vc)
1645 {
1646         vc->vc_saved_x          = vc->vc_x;
1647         vc->vc_saved_y          = vc->vc_y;
1648         vc->vc_s_intensity      = vc->vc_intensity;
1649         vc->vc_s_italic         = vc->vc_italic;
1650         vc->vc_s_underline      = vc->vc_underline;
1651         vc->vc_s_blink          = vc->vc_blink;
1652         vc->vc_s_reverse        = vc->vc_reverse;
1653         vc->vc_s_charset        = vc->vc_charset;
1654         vc->vc_s_color          = vc->vc_color;
1655         vc->vc_saved_G0         = vc->vc_G0_charset;
1656         vc->vc_saved_G1         = vc->vc_G1_charset;
1657 }
1658
1659 /* console_lock is held */
1660 static void restore_cur(struct vc_data *vc)
1661 {
1662         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1663         vc->vc_intensity        = vc->vc_s_intensity;
1664         vc->vc_italic           = vc->vc_s_italic;
1665         vc->vc_underline        = vc->vc_s_underline;
1666         vc->vc_blink            = vc->vc_s_blink;
1667         vc->vc_reverse          = vc->vc_s_reverse;
1668         vc->vc_charset          = vc->vc_s_charset;
1669         vc->vc_color            = vc->vc_s_color;
1670         vc->vc_G0_charset       = vc->vc_saved_G0;
1671         vc->vc_G1_charset       = vc->vc_saved_G1;
1672         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1673         update_attr(vc);
1674         vc->vc_need_wrap = 0;
1675 }
1676
1677 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1678         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1679         ESpalette, ESosc };
1680
1681 /* console_lock is held (except via vc_init()) */
1682 static void reset_terminal(struct vc_data *vc, int do_clear)
1683 {
1684         vc->vc_top              = 0;
1685         vc->vc_bottom           = vc->vc_rows;
1686         vc->vc_state            = ESnormal;
1687         vc->vc_ques             = 0;
1688         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1689         vc->vc_G0_charset       = LAT1_MAP;
1690         vc->vc_G1_charset       = GRAF_MAP;
1691         vc->vc_charset          = 0;
1692         vc->vc_need_wrap        = 0;
1693         vc->vc_report_mouse     = 0;
1694         vc->vc_utf              = default_utf8;
1695         vc->vc_utf_count        = 0;
1696
1697         vc->vc_disp_ctrl        = 0;
1698         vc->vc_toggle_meta      = 0;
1699
1700         vc->vc_decscnm          = 0;
1701         vc->vc_decom            = 0;
1702         vc->vc_decawm           = 1;
1703         vc->vc_deccm            = global_cursor_default;
1704         vc->vc_decim            = 0;
1705
1706         vt_reset_keyboard(vc->vc_num);
1707
1708         vc->vc_cursor_type = cur_default;
1709         vc->vc_complement_mask = vc->vc_s_complement_mask;
1710
1711         default_attr(vc);
1712         update_attr(vc);
1713
1714         vc->vc_tab_stop[0]      = 0x01010100;
1715         vc->vc_tab_stop[1]      =
1716         vc->vc_tab_stop[2]      =
1717         vc->vc_tab_stop[3]      =
1718         vc->vc_tab_stop[4]      =
1719         vc->vc_tab_stop[5]      =
1720         vc->vc_tab_stop[6]      =
1721         vc->vc_tab_stop[7]      = 0x01010101;
1722
1723         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1724         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1725         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1726
1727         gotoxy(vc, 0, 0);
1728         save_cur(vc);
1729         if (do_clear)
1730             csi_J(vc, 2);
1731 }
1732
1733 /* console_lock is held */
1734 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1735 {
1736         /*
1737          *  Control characters can be used in the _middle_
1738          *  of an escape sequence.
1739          */
1740         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1741                 return;
1742         switch (c) {
1743         case 0:
1744                 return;
1745         case 7:
1746                 if (vc->vc_state == ESosc)
1747                         vc->vc_state = ESnormal;
1748                 else if (vc->vc_bell_duration)
1749                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1750                 return;
1751         case 8:
1752                 bs(vc);
1753                 return;
1754         case 9:
1755                 vc->vc_pos -= (vc->vc_x << 1);
1756                 while (vc->vc_x < vc->vc_cols - 1) {
1757                         vc->vc_x++;
1758                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1759                                 break;
1760                 }
1761                 vc->vc_pos += (vc->vc_x << 1);
1762                 notify_write(vc, '\t');
1763                 return;
1764         case 10: case 11: case 12:
1765                 lf(vc);
1766                 if (!is_kbd(vc, lnm))
1767                         return;
1768         case 13:
1769                 cr(vc);
1770                 return;
1771         case 14:
1772                 vc->vc_charset = 1;
1773                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1774                 vc->vc_disp_ctrl = 1;
1775                 return;
1776         case 15:
1777                 vc->vc_charset = 0;
1778                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1779                 vc->vc_disp_ctrl = 0;
1780                 return;
1781         case 24: case 26:
1782                 vc->vc_state = ESnormal;
1783                 return;
1784         case 27:
1785                 vc->vc_state = ESesc;
1786                 return;
1787         case 127:
1788                 del(vc);
1789                 return;
1790         case 128+27:
1791                 vc->vc_state = ESsquare;
1792                 return;
1793         }
1794         switch(vc->vc_state) {
1795         case ESesc:
1796                 vc->vc_state = ESnormal;
1797                 switch (c) {
1798                 case '[':
1799                         vc->vc_state = ESsquare;
1800                         return;
1801                 case ']':
1802                         vc->vc_state = ESnonstd;
1803                         return;
1804                 case '%':
1805                         vc->vc_state = ESpercent;
1806                         return;
1807                 case 'E':
1808                         cr(vc);
1809                         lf(vc);
1810                         return;
1811                 case 'M':
1812                         ri(vc);
1813                         return;
1814                 case 'D':
1815                         lf(vc);
1816                         return;
1817                 case 'H':
1818                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1819                         return;
1820                 case 'Z':
1821                         respond_ID(tty);
1822                         return;
1823                 case '7':
1824                         save_cur(vc);
1825                         return;
1826                 case '8':
1827                         restore_cur(vc);
1828                         return;
1829                 case '(':
1830                         vc->vc_state = ESsetG0;
1831                         return;
1832                 case ')':
1833                         vc->vc_state = ESsetG1;
1834                         return;
1835                 case '#':
1836                         vc->vc_state = EShash;
1837                         return;
1838                 case 'c':
1839                         reset_terminal(vc, 1);
1840                         return;
1841                 case '>':  /* Numeric keypad */
1842                         clr_kbd(vc, kbdapplic);
1843                         return;
1844                 case '=':  /* Appl. keypad */
1845                         set_kbd(vc, kbdapplic);
1846                         return;
1847                 }
1848                 return;
1849         case ESnonstd:
1850                 if (c=='P') {   /* palette escape sequence */
1851                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1852                                 vc->vc_par[vc->vc_npar] = 0;
1853                         vc->vc_npar = 0;
1854                         vc->vc_state = ESpalette;
1855                         return;
1856                 } else if (c=='R') {   /* reset palette */
1857                         reset_palette(vc);
1858                         vc->vc_state = ESnormal;
1859                 } else if (c>='0' && c<='9')
1860                         vc->vc_state = ESosc;
1861                 else
1862                         vc->vc_state = ESnormal;
1863                 return;
1864         case ESpalette:
1865                 if (isxdigit(c)) {
1866                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1867                         if (vc->vc_npar == 7) {
1868                                 int i = vc->vc_par[0] * 3, j = 1;
1869                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1870                                 vc->vc_palette[i++] += vc->vc_par[j++];
1871                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1872                                 vc->vc_palette[i++] += vc->vc_par[j++];
1873                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1874                                 vc->vc_palette[i] += vc->vc_par[j];
1875                                 set_palette(vc);
1876                                 vc->vc_state = ESnormal;
1877                         }
1878                 } else
1879                         vc->vc_state = ESnormal;
1880                 return;
1881         case ESsquare:
1882                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1883                         vc->vc_par[vc->vc_npar] = 0;
1884                 vc->vc_npar = 0;
1885                 vc->vc_state = ESgetpars;
1886                 if (c == '[') { /* Function key */
1887                         vc->vc_state=ESfunckey;
1888                         return;
1889                 }
1890                 vc->vc_ques = (c == '?');
1891                 if (vc->vc_ques)
1892                         return;
1893         case ESgetpars:
1894                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1895                         vc->vc_npar++;
1896                         return;
1897                 } else if (c>='0' && c<='9') {
1898                         vc->vc_par[vc->vc_npar] *= 10;
1899                         vc->vc_par[vc->vc_npar] += c - '0';
1900                         return;
1901                 }
1902                 vc->vc_state = ESnormal;
1903                 switch(c) {
1904                 case 'h':
1905                         set_mode(vc, 1);
1906                         return;
1907                 case 'l':
1908                         set_mode(vc, 0);
1909                         return;
1910                 case 'c':
1911                         if (vc->vc_ques) {
1912                                 if (vc->vc_par[0])
1913                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1914                                 else
1915                                         vc->vc_cursor_type = cur_default;
1916                                 return;
1917                         }
1918                         break;
1919                 case 'm':
1920                         if (vc->vc_ques) {
1921                                 clear_selection();
1922                                 if (vc->vc_par[0])
1923                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1924                                 else
1925                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1926                                 return;
1927                         }
1928                         break;
1929                 case 'n':
1930                         if (!vc->vc_ques) {
1931                                 if (vc->vc_par[0] == 5)
1932                                         status_report(tty);
1933                                 else if (vc->vc_par[0] == 6)
1934                                         cursor_report(vc, tty);
1935                         }
1936                         return;
1937                 }
1938                 if (vc->vc_ques) {
1939                         vc->vc_ques = 0;
1940                         return;
1941                 }
1942                 switch(c) {
1943                 case 'G': case '`':
1944                         if (vc->vc_par[0])
1945                                 vc->vc_par[0]--;
1946                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1947                         return;
1948                 case 'A':
1949                         if (!vc->vc_par[0])
1950                                 vc->vc_par[0]++;
1951                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1952                         return;
1953                 case 'B': case 'e':
1954                         if (!vc->vc_par[0])
1955                                 vc->vc_par[0]++;
1956                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1957                         return;
1958                 case 'C': case 'a':
1959                         if (!vc->vc_par[0])
1960                                 vc->vc_par[0]++;
1961                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1962                         return;
1963                 case 'D':
1964                         if (!vc->vc_par[0])
1965                                 vc->vc_par[0]++;
1966                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1967                         return;
1968                 case 'E':
1969                         if (!vc->vc_par[0])
1970                                 vc->vc_par[0]++;
1971                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1972                         return;
1973                 case 'F':
1974                         if (!vc->vc_par[0])
1975                                 vc->vc_par[0]++;
1976                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1977                         return;
1978                 case 'd':
1979                         if (vc->vc_par[0])
1980                                 vc->vc_par[0]--;
1981                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1982                         return;
1983                 case 'H': case 'f':
1984                         if (vc->vc_par[0])
1985                                 vc->vc_par[0]--;
1986                         if (vc->vc_par[1])
1987                                 vc->vc_par[1]--;
1988                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1989                         return;
1990                 case 'J':
1991                         csi_J(vc, vc->vc_par[0]);
1992                         return;
1993                 case 'K':
1994                         csi_K(vc, vc->vc_par[0]);
1995                         return;
1996                 case 'L':
1997                         csi_L(vc, vc->vc_par[0]);
1998                         return;
1999                 case 'M':
2000                         csi_M(vc, vc->vc_par[0]);
2001                         return;
2002                 case 'P':
2003                         csi_P(vc, vc->vc_par[0]);
2004                         return;
2005                 case 'c':
2006                         if (!vc->vc_par[0])
2007                                 respond_ID(tty);
2008                         return;
2009                 case 'g':
2010                         if (!vc->vc_par[0])
2011                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2012                         else if (vc->vc_par[0] == 3) {
2013                                 vc->vc_tab_stop[0] =
2014                                         vc->vc_tab_stop[1] =
2015                                         vc->vc_tab_stop[2] =
2016                                         vc->vc_tab_stop[3] =
2017                                         vc->vc_tab_stop[4] =
2018                                         vc->vc_tab_stop[5] =
2019                                         vc->vc_tab_stop[6] =
2020                                         vc->vc_tab_stop[7] = 0;
2021                         }
2022                         return;
2023                 case 'm':
2024                         csi_m(vc);
2025                         return;
2026                 case 'q': /* DECLL - but only 3 leds */
2027                         /* map 0,1,2,3 to 0,1,2,4 */
2028                         if (vc->vc_par[0] < 4)
2029                                 vt_set_led_state(vc->vc_num,
2030                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2031                         return;
2032                 case 'r':
2033                         if (!vc->vc_par[0])
2034                                 vc->vc_par[0]++;
2035                         if (!vc->vc_par[1])
2036                                 vc->vc_par[1] = vc->vc_rows;
2037                         /* Minimum allowed region is 2 lines */
2038                         if (vc->vc_par[0] < vc->vc_par[1] &&
2039                             vc->vc_par[1] <= vc->vc_rows) {
2040                                 vc->vc_top = vc->vc_par[0] - 1;
2041                                 vc->vc_bottom = vc->vc_par[1];
2042                                 gotoxay(vc, 0, 0);
2043                         }
2044                         return;
2045                 case 's':
2046                         save_cur(vc);
2047                         return;
2048                 case 'u':
2049                         restore_cur(vc);
2050                         return;
2051                 case 'X':
2052                         csi_X(vc, vc->vc_par[0]);
2053                         return;
2054                 case '@':
2055                         csi_at(vc, vc->vc_par[0]);
2056                         return;
2057                 case ']': /* setterm functions */
2058                         setterm_command(vc);
2059                         return;
2060                 }
2061                 return;
2062         case ESpercent:
2063                 vc->vc_state = ESnormal;
2064                 switch (c) {
2065                 case '@':  /* defined in ISO 2022 */
2066                         vc->vc_utf = 0;
2067                         return;
2068                 case 'G':  /* prelim official escape code */
2069                 case '8':  /* retained for compatibility */
2070                         vc->vc_utf = 1;
2071                         return;
2072                 }
2073                 return;
2074         case ESfunckey:
2075                 vc->vc_state = ESnormal;
2076                 return;
2077         case EShash:
2078                 vc->vc_state = ESnormal;
2079                 if (c == '8') {
2080                         /* DEC screen alignment test. kludge :-) */
2081                         vc->vc_video_erase_char =
2082                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2083                         csi_J(vc, 2);
2084                         vc->vc_video_erase_char =
2085                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2086                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2087                 }
2088                 return;
2089         case ESsetG0:
2090                 if (c == '0')
2091                         vc->vc_G0_charset = GRAF_MAP;
2092                 else if (c == 'B')
2093                         vc->vc_G0_charset = LAT1_MAP;
2094                 else if (c == 'U')
2095                         vc->vc_G0_charset = IBMPC_MAP;
2096                 else if (c == 'K')
2097                         vc->vc_G0_charset = USER_MAP;
2098                 if (vc->vc_charset == 0)
2099                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2100                 vc->vc_state = ESnormal;
2101                 return;
2102         case ESsetG1:
2103                 if (c == '0')
2104                         vc->vc_G1_charset = GRAF_MAP;
2105                 else if (c == 'B')
2106                         vc->vc_G1_charset = LAT1_MAP;
2107                 else if (c == 'U')
2108                         vc->vc_G1_charset = IBMPC_MAP;
2109                 else if (c == 'K')
2110                         vc->vc_G1_charset = USER_MAP;
2111                 if (vc->vc_charset == 1)
2112                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2113                 vc->vc_state = ESnormal;
2114                 return;
2115         case ESosc:
2116                 return;
2117         default:
2118                 vc->vc_state = ESnormal;
2119         }
2120 }
2121
2122 /* is_double_width() is based on the wcwidth() implementation by
2123  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2124  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2125  */
2126 struct interval {
2127         uint32_t first;
2128         uint32_t last;
2129 };
2130
2131 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2132 {
2133         int min = 0;
2134         int mid;
2135
2136         if (ucs < table[0].first || ucs > table[max].last)
2137                 return 0;
2138         while (max >= min) {
2139                 mid = (min + max) / 2;
2140                 if (ucs > table[mid].last)
2141                         min = mid + 1;
2142                 else if (ucs < table[mid].first)
2143                         max = mid - 1;
2144                 else
2145                         return 1;
2146         }
2147         return 0;
2148 }
2149
2150 static int is_double_width(uint32_t ucs)
2151 {
2152         static const struct interval double_width[] = {
2153                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2154                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2155                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2156                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2157         };
2158         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2159 }
2160
2161 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2162                 unsigned long draw_to, int *draw_x)
2163 {
2164         if (*draw_x < 0)
2165                 return;
2166
2167         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2168                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2169         *draw_x = -1;
2170 }
2171
2172 /* acquires console_lock */
2173 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2174 {
2175         int c, tc, ok, n = 0, draw_x = -1;
2176         unsigned int currcons;
2177         unsigned long draw_from = 0, draw_to = 0;
2178         struct vc_data *vc;
2179         unsigned char vc_attr;
2180         struct vt_notifier_param param;
2181         uint8_t rescan;
2182         uint8_t inverse;
2183         uint8_t width;
2184         u16 himask, charmask;
2185
2186         if (in_interrupt())
2187                 return count;
2188
2189         might_sleep();
2190
2191         console_lock();
2192         vc = tty->driver_data;
2193         if (vc == NULL) {
2194                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2195                 console_unlock();
2196                 return 0;
2197         }
2198
2199         currcons = vc->vc_num;
2200         if (!vc_cons_allocated(currcons)) {
2201                 /* could this happen? */
2202                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2203                 console_unlock();
2204                 return 0;
2205         }
2206
2207         himask = vc->vc_hi_font_mask;
2208         charmask = himask ? 0x1ff : 0xff;
2209
2210         /* undraw cursor first */
2211         if (IS_FG(vc))
2212                 hide_cursor(vc);
2213
2214         param.vc = vc;
2215
2216         while (!tty->stopped && count) {
2217                 int orig = *buf;
2218                 c = orig;
2219                 buf++;
2220                 n++;
2221                 count--;
2222                 rescan = 0;
2223                 inverse = 0;
2224                 width = 1;
2225
2226                 /* Do no translation at all in control states */
2227                 if (vc->vc_state != ESnormal) {
2228                         tc = c;
2229                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2230                     /* Combine UTF-8 into Unicode in vc_utf_char.
2231                      * vc_utf_count is the number of continuation bytes still
2232                      * expected to arrive.
2233                      * vc_npar is the number of continuation bytes arrived so
2234                      * far
2235                      */
2236 rescan_last_byte:
2237                     if ((c & 0xc0) == 0x80) {
2238                         /* Continuation byte received */
2239                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2240                         if (vc->vc_utf_count) {
2241                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2242                             vc->vc_npar++;
2243                             if (--vc->vc_utf_count) {
2244                                 /* Still need some bytes */
2245                                 continue;
2246                             }
2247                             /* Got a whole character */
2248                             c = vc->vc_utf_char;
2249                             /* Reject overlong sequences */
2250                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2251                                         c > utf8_length_changes[vc->vc_npar])
2252                                 c = 0xfffd;
2253                         } else {
2254                             /* Unexpected continuation byte */
2255                             vc->vc_utf_count = 0;
2256                             c = 0xfffd;
2257                         }
2258                     } else {
2259                         /* Single ASCII byte or first byte of a sequence received */
2260                         if (vc->vc_utf_count) {
2261                             /* Continuation byte expected */
2262                             rescan = 1;
2263                             vc->vc_utf_count = 0;
2264                             c = 0xfffd;
2265                         } else if (c > 0x7f) {
2266                             /* First byte of a multibyte sequence received */
2267                             vc->vc_npar = 0;
2268                             if ((c & 0xe0) == 0xc0) {
2269                                 vc->vc_utf_count = 1;
2270                                 vc->vc_utf_char = (c & 0x1f);
2271                             } else if ((c & 0xf0) == 0xe0) {
2272                                 vc->vc_utf_count = 2;
2273                                 vc->vc_utf_char = (c & 0x0f);
2274                             } else if ((c & 0xf8) == 0xf0) {
2275                                 vc->vc_utf_count = 3;
2276                                 vc->vc_utf_char = (c & 0x07);
2277                             } else if ((c & 0xfc) == 0xf8) {
2278                                 vc->vc_utf_count = 4;
2279                                 vc->vc_utf_char = (c & 0x03);
2280                             } else if ((c & 0xfe) == 0xfc) {
2281                                 vc->vc_utf_count = 5;
2282                                 vc->vc_utf_char = (c & 0x01);
2283                             } else {
2284                                 /* 254 and 255 are invalid */
2285                                 c = 0xfffd;
2286                             }
2287                             if (vc->vc_utf_count) {
2288                                 /* Still need some bytes */
2289                                 continue;
2290                             }
2291                         }
2292                         /* Nothing to do if an ASCII byte was received */
2293                     }
2294                     /* End of UTF-8 decoding. */
2295                     /* c is the received character, or U+FFFD for invalid sequences. */
2296                     /* Replace invalid Unicode code points with U+FFFD too */
2297                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2298                         c = 0xfffd;
2299                     tc = c;
2300                 } else {        /* no utf or alternate charset mode */
2301                     tc = vc_translate(vc, c);
2302                 }
2303
2304                 param.c = tc;
2305                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2306                                         &param) == NOTIFY_STOP)
2307                         continue;
2308
2309                 /* If the original code was a control character we
2310                  * only allow a glyph to be displayed if the code is
2311                  * not normally used (such as for cursor movement) or
2312                  * if the disp_ctrl mode has been explicitly enabled.
2313                  * Certain characters (as given by the CTRL_ALWAYS
2314                  * bitmap) are always displayed as control characters,
2315                  * as the console would be pretty useless without
2316                  * them; to display an arbitrary font position use the
2317                  * direct-to-font zone in UTF-8 mode.
2318                  */
2319                 ok = tc && (c >= 32 ||
2320                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2321                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2322                         && (c != 127 || vc->vc_disp_ctrl)
2323                         && (c != 128+27);
2324
2325                 if (vc->vc_state == ESnormal && ok) {
2326                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2327                                 if (is_double_width(c))
2328                                         width = 2;
2329                         }
2330                         /* Now try to find out how to display it */
2331                         tc = conv_uni_to_pc(vc, tc);
2332                         if (tc & ~charmask) {
2333                                 if (tc == -1 || tc == -2) {
2334                                     continue; /* nothing to display */
2335                                 }
2336                                 /* Glyph not found */
2337                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2338                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2339                                        This would make absolutely no sense with Unicode in mind,
2340                                        but do this for ASCII characters since a font may lack
2341                                        Unicode mapping info and we don't want to end up with
2342                                        having question marks only. */
2343                                     tc = c;
2344                                 } else {
2345                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2346                                     tc = conv_uni_to_pc(vc, 0xfffd);
2347                                     if (tc < 0) {
2348                                         inverse = 1;
2349                                         tc = conv_uni_to_pc(vc, '?');
2350                                         if (tc < 0) tc = '?';
2351                                     }
2352                                 }
2353                         }
2354
2355                         if (!inverse) {
2356                                 vc_attr = vc->vc_attr;
2357                         } else {
2358                                 /* invert vc_attr */
2359                                 if (!vc->vc_can_do_color) {
2360                                         vc_attr = (vc->vc_attr) ^ 0x08;
2361                                 } else if (vc->vc_hi_font_mask == 0x100) {
2362                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2363                                 } else {
2364                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2365                                 }
2366                                 con_flush(vc, draw_from, draw_to, &draw_x);
2367                         }
2368
2369                         while (1) {
2370                                 if (vc->vc_need_wrap || vc->vc_decim)
2371                                         con_flush(vc, draw_from, draw_to,
2372                                                         &draw_x);
2373                                 if (vc->vc_need_wrap) {
2374                                         cr(vc);
2375                                         lf(vc);
2376                                 }
2377                                 if (vc->vc_decim)
2378                                         insert_char(vc, 1);
2379                                 scr_writew(himask ?
2380                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2381                                              (vc_attr << 8) + tc,
2382                                            (u16 *) vc->vc_pos);
2383                                 if (DO_UPDATE(vc) && draw_x < 0) {
2384                                         draw_x = vc->vc_x;
2385                                         draw_from = vc->vc_pos;
2386                                 }
2387                                 if (vc->vc_x == vc->vc_cols - 1) {
2388                                         vc->vc_need_wrap = vc->vc_decawm;
2389                                         draw_to = vc->vc_pos + 2;
2390                                 } else {
2391                                         vc->vc_x++;
2392                                         draw_to = (vc->vc_pos += 2);
2393                                 }
2394
2395                                 if (!--width) break;
2396
2397                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2398                                 if (tc < 0) tc = ' ';
2399                         }
2400                         notify_write(vc, c);
2401
2402                         if (inverse)
2403                                 con_flush(vc, draw_from, draw_to, &draw_x);
2404
2405                         if (rescan) {
2406                                 rescan = 0;
2407                                 inverse = 0;
2408                                 width = 1;
2409                                 c = orig;
2410                                 goto rescan_last_byte;
2411                         }
2412                         continue;
2413                 }
2414                 con_flush(vc, draw_from, draw_to, &draw_x);
2415                 do_con_trol(tty, vc, orig);
2416         }
2417         con_flush(vc, draw_from, draw_to, &draw_x);
2418         console_conditional_schedule();
2419         console_unlock();
2420         notify_update(vc);
2421         return n;
2422 }
2423
2424 /*
2425  * This is the console switching callback.
2426  *
2427  * Doing console switching in a process context allows
2428  * us to do the switches asynchronously (needed when we want
2429  * to switch due to a keyboard interrupt).  Synchronization
2430  * with other console code and prevention of re-entrancy is
2431  * ensured with console_lock.
2432  */
2433 static void console_callback(struct work_struct *ignored)
2434 {
2435         console_lock();
2436
2437         if (want_console >= 0) {
2438                 if (want_console != fg_console &&
2439                     vc_cons_allocated(want_console)) {
2440                         hide_cursor(vc_cons[fg_console].d);
2441                         change_console(vc_cons[want_console].d);
2442                         /* we only changed when the console had already
2443                            been allocated - a new console is not created
2444                            in an interrupt routine */
2445                 }
2446                 want_console = -1;
2447         }
2448         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2449                 do_poke_blanked_console = 0;
2450                 poke_blanked_console();
2451         }
2452         if (scrollback_delta) {
2453                 struct vc_data *vc = vc_cons[fg_console].d;
2454                 clear_selection();
2455                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2456                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2457                 scrollback_delta = 0;
2458         }
2459         if (blank_timer_expired) {
2460                 do_blank_screen(0);
2461                 blank_timer_expired = 0;
2462         }
2463         notify_update(vc_cons[fg_console].d);
2464
2465         console_unlock();
2466 }
2467
2468 int set_console(int nr)
2469 {
2470         struct vc_data *vc = vc_cons[fg_console].d;
2471
2472         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2473                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2474
2475                 /*
2476                  * Console switch will fail in console_callback() or
2477                  * change_console() so there is no point scheduling
2478                  * the callback
2479                  *
2480                  * Existing set_console() users don't check the return
2481                  * value so this shouldn't break anything
2482                  */
2483                 return -EINVAL;
2484         }
2485
2486         want_console = nr;
2487         schedule_console_callback();
2488
2489         return 0;
2490 }
2491
2492 struct tty_driver *console_driver;
2493
2494 #ifdef CONFIG_VT_CONSOLE
2495
2496 /**
2497  * vt_kmsg_redirect() - Sets/gets the kernel message console
2498  * @new:        The new virtual terminal number or -1 if the console should stay
2499  *              unchanged
2500  *
2501  * By default, the kernel messages are always printed on the current virtual
2502  * console. However, the user may modify that default with the
2503  * TIOCL_SETKMSGREDIRECT ioctl call.
2504  *
2505  * This function sets the kernel message console to be @new. It returns the old
2506  * virtual console number. The virtual terminal number 0 (both as parameter and
2507  * return value) means no redirection (i.e. always printed on the currently
2508  * active console).
2509  *
2510  * The parameter -1 means that only the current console is returned, but the
2511  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2512  * case to make the code more understandable.
2513  *
2514  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2515  * the parameter and always returns 0.
2516  */
2517 int vt_kmsg_redirect(int new)
2518 {
2519         static int kmsg_con;
2520
2521         if (new != -1)
2522                 return xchg(&kmsg_con, new);
2523         else
2524                 return kmsg_con;
2525 }
2526
2527 /*
2528  *      Console on virtual terminal
2529  *
2530  * The console must be locked when we get here.
2531  */
2532
2533 static void vt_console_print(struct console *co, const char *b, unsigned count)
2534 {
2535         struct vc_data *vc = vc_cons[fg_console].d;
2536         unsigned char c;
2537         static DEFINE_SPINLOCK(printing_lock);
2538         const ushort *start;
2539         ushort cnt = 0;
2540         ushort myx;
2541         int kmsg_console;
2542
2543         /* console busy or not yet initialized */
2544         if (!printable)
2545                 return;
2546         if (!spin_trylock(&printing_lock))
2547                 return;
2548
2549         kmsg_console = vt_get_kmsg_redirect();
2550         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2551                 vc = vc_cons[kmsg_console - 1].d;
2552
2553         /* read `x' only after setting currcons properly (otherwise
2554            the `x' macro will read the x of the foreground console). */
2555         myx = vc->vc_x;
2556
2557         if (!vc_cons_allocated(fg_console)) {
2558                 /* impossible */
2559                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2560                 goto quit;
2561         }
2562
2563         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2564                 goto quit;
2565
2566         /* undraw cursor first */
2567         if (IS_FG(vc))
2568                 hide_cursor(vc);
2569
2570         start = (ushort *)vc->vc_pos;
2571
2572         /* Contrived structure to try to emulate original need_wrap behaviour
2573          * Problems caused when we have need_wrap set on '\n' character */
2574         while (count--) {
2575                 c = *b++;
2576                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2577                         if (cnt > 0) {
2578                                 if (CON_IS_VISIBLE(vc))
2579                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2580                                 vc->vc_x += cnt;
2581                                 if (vc->vc_need_wrap)
2582                                         vc->vc_x--;
2583                                 cnt = 0;
2584                         }
2585                         if (c == 8) {           /* backspace */
2586                                 bs(vc);
2587                                 start = (ushort *)vc->vc_pos;
2588                                 myx = vc->vc_x;
2589                                 continue;
2590                         }
2591                         if (c != 13)
2592                                 lf(vc);
2593                         cr(vc);
2594                         start = (ushort *)vc->vc_pos;
2595                         myx = vc->vc_x;
2596                         if (c == 10 || c == 13)
2597                                 continue;
2598                 }
2599                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2600                 notify_write(vc, c);
2601                 cnt++;
2602                 if (myx == vc->vc_cols - 1) {
2603                         vc->vc_need_wrap = 1;
2604                         continue;
2605                 }
2606                 vc->vc_pos += 2;
2607                 myx++;
2608         }
2609         if (cnt > 0) {
2610                 if (CON_IS_VISIBLE(vc))
2611                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2612                 vc->vc_x += cnt;
2613                 if (vc->vc_x == vc->vc_cols) {
2614                         vc->vc_x--;
2615                         vc->vc_need_wrap = 1;
2616                 }
2617         }
2618         set_cursor(vc);
2619         notify_update(vc);
2620
2621 quit:
2622         spin_unlock(&printing_lock);
2623 }
2624
2625 static struct tty_driver *vt_console_device(struct console *c, int *index)
2626 {
2627         *index = c->index ? c->index-1 : fg_console;
2628         return console_driver;
2629 }
2630
2631 static struct console vt_console_driver = {
2632         .name           = "tty",
2633         .write          = vt_console_print,
2634         .device         = vt_console_device,
2635         .unblank        = unblank_screen,
2636         .flags          = CON_PRINTBUFFER,
2637         .index          = -1,
2638 };
2639 #endif
2640
2641 /*
2642  *      Handling of Linux-specific VC ioctls
2643  */
2644
2645 /*
2646  * Generally a bit racy with respect to console_lock();.
2647  *
2648  * There are some functions which don't need it.
2649  *
2650  * There are some functions which can sleep for arbitrary periods
2651  * (paste_selection) but we don't need the lock there anyway.
2652  *
2653  * set_selection has locking, and definitely needs it
2654  */
2655
2656 int tioclinux(struct tty_struct *tty, unsigned long arg)
2657 {
2658         char type, data;
2659         char __user *p = (char __user *)arg;
2660         int lines;
2661         int ret;
2662
2663         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2664                 return -EPERM;
2665         if (get_user(type, p))
2666                 return -EFAULT;
2667         ret = 0;
2668
2669         switch (type)
2670         {
2671                 case TIOCL_SETSEL:
2672                         console_lock();
2673                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2674                         console_unlock();
2675                         break;
2676                 case TIOCL_PASTESEL:
2677                         ret = paste_selection(tty);
2678                         break;
2679                 case TIOCL_UNBLANKSCREEN:
2680                         console_lock();
2681                         unblank_screen();
2682                         console_unlock();
2683                         break;
2684                 case TIOCL_SELLOADLUT:
2685                         console_lock();
2686                         ret = sel_loadlut(p);
2687                         console_unlock();
2688                         break;
2689                 case TIOCL_GETSHIFTSTATE:
2690
2691         /*
2692          * Make it possible to react to Shift+Mousebutton.
2693          * Note that 'shift_state' is an undocumented
2694          * kernel-internal variable; programs not closely
2695          * related to the kernel should not use this.
2696          */
2697                         data = vt_get_shift_state();
2698                         ret = __put_user(data, p);
2699                         break;
2700                 case TIOCL_GETMOUSEREPORTING:
2701                         console_lock(); /* May be overkill */
2702                         data = mouse_reporting();
2703                         console_unlock();
2704                         ret = __put_user(data, p);
2705                         break;
2706                 case TIOCL_SETVESABLANK:
2707                         console_lock();
2708                         ret = set_vesa_blanking(p);
2709                         console_unlock();
2710                         break;
2711                 case TIOCL_GETKMSGREDIRECT:
2712                         data = vt_get_kmsg_redirect();
2713                         ret = __put_user(data, p);
2714                         break;
2715                 case TIOCL_SETKMSGREDIRECT:
2716                         if (!capable(CAP_SYS_ADMIN)) {
2717                                 ret = -EPERM;
2718                         } else {
2719                                 if (get_user(data, p+1))
2720                                         ret = -EFAULT;
2721                                 else
2722                                         vt_kmsg_redirect(data);
2723                         }
2724                         break;
2725                 case TIOCL_GETFGCONSOLE:
2726                         /* No locking needed as this is a transiently
2727                            correct return anyway if the caller hasn't
2728                            disabled switching */
2729                         ret = fg_console;
2730                         break;
2731                 case TIOCL_SCROLLCONSOLE:
2732                         if (get_user(lines, (s32 __user *)(p+4))) {
2733                                 ret = -EFAULT;
2734                         } else {
2735                                 /* Need the console lock here. Note that lots
2736                                    of other calls need fixing before the lock
2737                                    is actually useful ! */
2738                                 console_lock();
2739                                 scrollfront(vc_cons[fg_console].d, lines);
2740                                 console_unlock();
2741                                 ret = 0;
2742                         }
2743                         break;
2744                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2745                         console_lock();
2746                         ignore_poke = 1;
2747                         do_blank_screen(0);
2748                         console_unlock();
2749                         break;
2750                 case TIOCL_BLANKEDSCREEN:
2751                         ret = console_blanked;
2752                         break;
2753                 default:
2754                         ret = -EINVAL;
2755                         break;
2756         }
2757         return ret;
2758 }
2759
2760 /*
2761  * /dev/ttyN handling
2762  */
2763
2764 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2765 {
2766         int     retval;
2767
2768         retval = do_con_write(tty, buf, count);
2769         con_flush_chars(tty);
2770
2771         return retval;
2772 }
2773
2774 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2775 {
2776         if (in_interrupt())
2777                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2778         return do_con_write(tty, &ch, 1);
2779 }
2780
2781 static int con_write_room(struct tty_struct *tty)
2782 {
2783         if (tty->stopped)
2784                 return 0;
2785         return 32768;           /* No limit, really; we're not buffering */
2786 }
2787
2788 static int con_chars_in_buffer(struct tty_struct *tty)
2789 {
2790         return 0;               /* we're not buffering */
2791 }
2792
2793 /*
2794  * con_throttle and con_unthrottle are only used for
2795  * paste_selection(), which has to stuff in a large number of
2796  * characters...
2797  */
2798 static void con_throttle(struct tty_struct *tty)
2799 {
2800 }
2801
2802 static void con_unthrottle(struct tty_struct *tty)
2803 {
2804         struct vc_data *vc = tty->driver_data;
2805
2806         wake_up_interruptible(&vc->paste_wait);
2807 }
2808
2809 /*
2810  * Turn the Scroll-Lock LED on when the tty is stopped
2811  */
2812 static void con_stop(struct tty_struct *tty)
2813 {
2814         int console_num;
2815         if (!tty)
2816                 return;
2817         console_num = tty->index;
2818         if (!vc_cons_allocated(console_num))
2819                 return;
2820         vt_kbd_con_stop(console_num);
2821 }
2822
2823 /*
2824  * Turn the Scroll-Lock LED off when the console is started
2825  */
2826 static void con_start(struct tty_struct *tty)
2827 {
2828         int console_num;
2829         if (!tty)
2830                 return;
2831         console_num = tty->index;
2832         if (!vc_cons_allocated(console_num))
2833                 return;
2834         vt_kbd_con_start(console_num);
2835 }
2836
2837 static void con_flush_chars(struct tty_struct *tty)
2838 {
2839         struct vc_data *vc;
2840
2841         if (in_interrupt())     /* from flush_to_ldisc */
2842                 return;
2843
2844         /* if we race with con_close(), vt may be null */
2845         console_lock();
2846         vc = tty->driver_data;
2847         if (vc)
2848                 set_cursor(vc);
2849         console_unlock();
2850 }
2851
2852 /*
2853  * Allocate the console screen memory.
2854  */
2855 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2856 {
2857         unsigned int currcons = tty->index;
2858         struct vc_data *vc;
2859         int ret;
2860
2861         console_lock();
2862         ret = vc_allocate(currcons);
2863         if (ret)
2864                 goto unlock;
2865
2866         vc = vc_cons[currcons].d;
2867
2868         /* Still being freed */
2869         if (vc->port.tty) {
2870                 ret = -ERESTARTSYS;
2871                 goto unlock;
2872         }
2873
2874         ret = tty_port_install(&vc->port, driver, tty);
2875         if (ret)
2876                 goto unlock;
2877
2878         tty->driver_data = vc;
2879         vc->port.tty = tty;
2880
2881         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2882                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2883                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2884         }
2885         if (vc->vc_utf)
2886                 tty->termios.c_iflag |= IUTF8;
2887         else
2888                 tty->termios.c_iflag &= ~IUTF8;
2889 unlock:
2890         console_unlock();
2891         return ret;
2892 }
2893
2894 static int con_open(struct tty_struct *tty, struct file *filp)
2895 {
2896         /* everything done in install */
2897         return 0;
2898 }
2899
2900
2901 static void con_close(struct tty_struct *tty, struct file *filp)
2902 {
2903         /* Nothing to do - we defer to shutdown */
2904 }
2905
2906 static void con_shutdown(struct tty_struct *tty)
2907 {
2908         struct vc_data *vc = tty->driver_data;
2909         BUG_ON(vc == NULL);
2910         console_lock();
2911         vc->port.tty = NULL;
2912         console_unlock();
2913 }
2914
2915 static int default_color           = 7; /* white */
2916 static int default_italic_color    = 2; // green (ASCII)
2917 static int default_underline_color = 3; // cyan (ASCII)
2918 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2919 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2920 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2921
2922 static void vc_init(struct vc_data *vc, unsigned int rows,
2923                     unsigned int cols, int do_clear)
2924 {
2925         int j, k ;
2926
2927         vc->vc_cols = cols;
2928         vc->vc_rows = rows;
2929         vc->vc_size_row = cols << 1;
2930         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2931
2932         set_origin(vc);
2933         vc->vc_pos = vc->vc_origin;
2934         reset_vc(vc);
2935         for (j=k=0; j<16; j++) {
2936                 vc->vc_palette[k++] = default_red[j] ;
2937                 vc->vc_palette[k++] = default_grn[j] ;
2938                 vc->vc_palette[k++] = default_blu[j] ;
2939         }
2940         vc->vc_def_color       = default_color;
2941         vc->vc_ulcolor         = default_underline_color;
2942         vc->vc_itcolor         = default_italic_color;
2943         vc->vc_halfcolor       = 0x08;   /* grey */
2944         init_waitqueue_head(&vc->paste_wait);
2945         reset_terminal(vc, do_clear);
2946 }
2947
2948 /*
2949  * This routine initializes console interrupts, and does nothing
2950  * else. If you want the screen to clear, call tty_write with
2951  * the appropriate escape-sequence.
2952  */
2953
2954 static int __init con_init(void)
2955 {
2956         const char *display_desc = NULL;
2957         struct vc_data *vc;
2958         unsigned int currcons = 0, i;
2959
2960         console_lock();
2961
2962         if (conswitchp)
2963                 display_desc = conswitchp->con_startup();
2964         if (!display_desc) {
2965                 fg_console = 0;
2966                 console_unlock();
2967                 return 0;
2968         }
2969
2970         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2971                 struct con_driver *con_driver = &registered_con_driver[i];
2972
2973                 if (con_driver->con == NULL) {
2974                         con_driver->con = conswitchp;
2975                         con_driver->desc = display_desc;
2976                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2977                         con_driver->first = 0;
2978                         con_driver->last = MAX_NR_CONSOLES - 1;
2979                         break;
2980                 }
2981         }
2982
2983         for (i = 0; i < MAX_NR_CONSOLES; i++)
2984                 con_driver_map[i] = conswitchp;
2985
2986         if (blankinterval) {
2987                 blank_state = blank_normal_wait;
2988                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2989         }
2990
2991         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2992                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2993                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2994                 tty_port_init(&vc->port);
2995                 visual_init(vc, currcons, 1);
2996                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2997                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2998                         currcons || !vc->vc_sw->con_save_screen);
2999         }
3000         currcons = fg_console = 0;
3001         master_display_fg = vc = vc_cons[currcons].d;
3002         set_origin(vc);
3003         save_screen(vc);
3004         gotoxy(vc, vc->vc_x, vc->vc_y);
3005         csi_J(vc, 0);
3006         update_screen(vc);
3007         pr_info("Console: %s %s %dx%d\n",
3008                 vc->vc_can_do_color ? "colour" : "mono",
3009                 display_desc, vc->vc_cols, vc->vc_rows);
3010         printable = 1;
3011
3012         console_unlock();
3013
3014 #ifdef CONFIG_VT_CONSOLE
3015         register_console(&vt_console_driver);
3016 #endif
3017         return 0;
3018 }
3019 console_initcall(con_init);
3020
3021 static const struct tty_operations con_ops = {
3022         .install = con_install,
3023         .open = con_open,
3024         .close = con_close,
3025         .write = con_write,
3026         .write_room = con_write_room,
3027         .put_char = con_put_char,
3028         .flush_chars = con_flush_chars,
3029         .chars_in_buffer = con_chars_in_buffer,
3030         .ioctl = vt_ioctl,
3031 #ifdef CONFIG_COMPAT
3032         .compat_ioctl = vt_compat_ioctl,
3033 #endif
3034         .stop = con_stop,
3035         .start = con_start,
3036         .throttle = con_throttle,
3037         .unthrottle = con_unthrottle,
3038         .resize = vt_resize,
3039         .shutdown = con_shutdown
3040 };
3041
3042 static struct cdev vc0_cdev;
3043
3044 static ssize_t show_tty_active(struct device *dev,
3045                                 struct device_attribute *attr, char *buf)
3046 {
3047         return sprintf(buf, "tty%d\n", fg_console + 1);
3048 }
3049 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3050
3051 static struct attribute *vt_dev_attrs[] = {
3052         &dev_attr_active.attr,
3053         NULL
3054 };
3055
3056 ATTRIBUTE_GROUPS(vt_dev);
3057
3058 int __init vty_init(const struct file_operations *console_fops)
3059 {
3060         cdev_init(&vc0_cdev, console_fops);
3061         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3062             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3063                 panic("Couldn't register /dev/tty0 driver\n");
3064         tty0dev = device_create_with_groups(tty_class, NULL,
3065                                             MKDEV(TTY_MAJOR, 0), NULL,
3066                                             vt_dev_groups, "tty0");
3067         if (IS_ERR(tty0dev))
3068                 tty0dev = NULL;
3069
3070         vcs_init();
3071
3072         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3073         if (!console_driver)
3074                 panic("Couldn't allocate console driver\n");
3075
3076         console_driver->name = "tty";
3077         console_driver->name_base = 1;
3078         console_driver->major = TTY_MAJOR;
3079         console_driver->minor_start = 1;
3080         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3081         console_driver->init_termios = tty_std_termios;
3082         if (default_utf8)
3083                 console_driver->init_termios.c_iflag |= IUTF8;
3084         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3085         tty_set_operations(console_driver, &con_ops);
3086         if (tty_register_driver(console_driver))
3087                 panic("Couldn't register console driver\n");
3088         kbd_init();
3089         console_map_init();
3090 #ifdef CONFIG_MDA_CONSOLE
3091         mda_console_init();
3092 #endif
3093         return 0;
3094 }
3095
3096 #ifndef VT_SINGLE_DRIVER
3097
3098 static struct class *vtconsole_class;
3099
3100 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3101                            int deflt)
3102 {
3103         struct module *owner = csw->owner;
3104         const char *desc = NULL;
3105         struct con_driver *con_driver;
3106         int i, j = -1, k = -1, retval = -ENODEV;
3107
3108         if (!try_module_get(owner))
3109                 return -ENODEV;
3110
3111         WARN_CONSOLE_UNLOCKED();
3112
3113         /* check if driver is registered */
3114         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3115                 con_driver = &registered_con_driver[i];
3116
3117                 if (con_driver->con == csw) {
3118                         desc = con_driver->desc;
3119                         retval = 0;
3120                         break;
3121                 }
3122         }
3123
3124         if (retval)
3125                 goto err;
3126
3127         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3128                 csw->con_startup();
3129                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3130         }
3131
3132         if (deflt) {
3133                 if (conswitchp)
3134                         module_put(conswitchp->owner);
3135
3136                 __module_get(owner);
3137                 conswitchp = csw;
3138         }
3139
3140         first = max(first, con_driver->first);
3141         last = min(last, con_driver->last);
3142
3143         for (i = first; i <= last; i++) {
3144                 int old_was_color;
3145                 struct vc_data *vc = vc_cons[i].d;
3146
3147                 if (con_driver_map[i])
3148                         module_put(con_driver_map[i]->owner);
3149                 __module_get(owner);
3150                 con_driver_map[i] = csw;
3151
3152                 if (!vc || !vc->vc_sw)
3153                         continue;
3154
3155                 j = i;
3156
3157                 if (CON_IS_VISIBLE(vc)) {
3158                         k = i;
3159                         save_screen(vc);
3160                 }
3161
3162                 old_was_color = vc->vc_can_do_color;
3163                 vc->vc_sw->con_deinit(vc);
3164                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3165                 visual_init(vc, i, 0);
3166                 set_origin(vc);
3167                 update_attr(vc);
3168
3169                 /* If the console changed between mono <-> color, then
3170                  * the attributes in the screenbuf will be wrong.  The
3171                  * following resets all attributes to something sane.
3172                  */
3173                 if (old_was_color != vc->vc_can_do_color)
3174                         clear_buffer_attributes(vc);
3175         }
3176
3177         pr_info("Console: switching ");
3178         if (!deflt)
3179                 printk("consoles %d-%d ", first+1, last+1);
3180         if (j >= 0) {
3181                 struct vc_data *vc = vc_cons[j].d;
3182
3183                 printk("to %s %s %dx%d\n",
3184                        vc->vc_can_do_color ? "colour" : "mono",
3185                        desc, vc->vc_cols, vc->vc_rows);
3186
3187                 if (k >= 0) {
3188                         vc = vc_cons[k].d;
3189                         update_screen(vc);
3190                 }
3191         } else
3192                 printk("to %s\n", desc);
3193
3194         retval = 0;
3195 err:
3196         module_put(owner);
3197         return retval;
3198 };
3199
3200
3201 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3202 /* unlocked version of unbind_con_driver() */
3203 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3204 {
3205         struct module *owner = csw->owner;
3206         const struct consw *defcsw = NULL;
3207         struct con_driver *con_driver = NULL, *con_back = NULL;
3208         int i, retval = -ENODEV;
3209
3210         if (!try_module_get(owner))
3211                 return -ENODEV;
3212
3213         WARN_CONSOLE_UNLOCKED();
3214
3215         /* check if driver is registered and if it is unbindable */
3216         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3217                 con_driver = &registered_con_driver[i];
3218
3219                 if (con_driver->con == csw &&
3220                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3221                         retval = 0;
3222                         break;
3223                 }
3224         }
3225
3226         if (retval)
3227                 goto err;
3228
3229         retval = -ENODEV;
3230
3231         /* check if backup driver exists */
3232         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3233                 con_back = &registered_con_driver[i];
3234
3235                 if (con_back->con && con_back->con != csw) {
3236                         defcsw = con_back->con;
3237                         retval = 0;
3238                         break;
3239                 }
3240         }
3241
3242         if (retval)
3243                 goto err;
3244
3245         if (!con_is_bound(csw))
3246                 goto err;
3247
3248         first = max(first, con_driver->first);
3249         last = min(last, con_driver->last);
3250
3251         for (i = first; i <= last; i++) {
3252                 if (con_driver_map[i] == csw) {
3253                         module_put(csw->owner);
3254                         con_driver_map[i] = NULL;
3255                 }
3256         }
3257
3258         if (!con_is_bound(defcsw)) {
3259                 const struct consw *defconsw = conswitchp;
3260
3261                 defcsw->con_startup();
3262                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3263                 /*
3264                  * vgacon may change the default driver to point
3265                  * to dummycon, we restore it here...
3266                  */
3267                 conswitchp = defconsw;
3268         }
3269
3270         if (!con_is_bound(csw))
3271                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3272
3273         /* ignore return value, binding should not fail */
3274         do_bind_con_driver(defcsw, first, last, deflt);
3275 err:
3276         module_put(owner);
3277         return retval;
3278
3279 }
3280 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3281
3282 static int vt_bind(struct con_driver *con)
3283 {
3284         const struct consw *defcsw = NULL, *csw = NULL;
3285         int i, more = 1, first = -1, last = -1, deflt = 0;
3286
3287         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3288                 goto err;
3289
3290         csw = con->con;
3291
3292         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3293                 struct con_driver *con = &registered_con_driver[i];
3294
3295                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3296                         defcsw = con->con;
3297                         break;
3298                 }
3299         }
3300
3301         if (!defcsw)
3302                 goto err;
3303
3304         while (more) {
3305                 more = 0;
3306
3307                 for (i = con->first; i <= con->last; i++) {
3308                         if (con_driver_map[i] == defcsw) {
3309                                 if (first == -1)
3310                                         first = i;
3311                                 last = i;
3312                                 more = 1;
3313                         } else if (first != -1)
3314                                 break;
3315                 }
3316
3317                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3318                         deflt = 1;
3319
3320                 if (first != -1)
3321                         do_bind_con_driver(csw, first, last, deflt);
3322
3323                 first = -1;
3324                 last = -1;
3325                 deflt = 0;
3326         }
3327
3328 err:
3329         return 0;
3330 }
3331
3332 static int vt_unbind(struct con_driver *con)
3333 {
3334         const struct consw *csw = NULL;
3335         int i, more = 1, first = -1, last = -1, deflt = 0;
3336         int ret;
3337
3338         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3339                 goto err;
3340
3341         csw = con->con;
3342
3343         while (more) {
3344                 more = 0;
3345
3346                 for (i = con->first; i <= con->last; i++) {
3347                         if (con_driver_map[i] == csw) {
3348                                 if (first == -1)
3349                                         first = i;
3350                                 last = i;
3351                                 more = 1;
3352                         } else if (first != -1)
3353                                 break;
3354                 }
3355
3356                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3357                         deflt = 1;
3358
3359                 if (first != -1) {
3360                         ret = do_unbind_con_driver(csw, first, last, deflt);
3361                         if (ret != 0)
3362                                 return ret;
3363                 }
3364
3365                 first = -1;
3366                 last = -1;
3367                 deflt = 0;
3368         }
3369
3370 err:
3371         return 0;
3372 }
3373 #else
3374 static inline int vt_bind(struct con_driver *con)
3375 {
3376         return 0;
3377 }
3378 static inline int vt_unbind(struct con_driver *con)
3379 {
3380         return 0;
3381 }
3382 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3383
3384 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3385                           const char *buf, size_t count)
3386 {
3387         struct con_driver *con = dev_get_drvdata(dev);
3388         int bind = simple_strtoul(buf, NULL, 0);
3389
3390         console_lock();
3391
3392         if (bind)
3393                 vt_bind(con);
3394         else
3395                 vt_unbind(con);
3396
3397         console_unlock();
3398
3399         return count;
3400 }
3401
3402 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3403                          char *buf)
3404 {
3405         struct con_driver *con = dev_get_drvdata(dev);
3406         int bind = con_is_bound(con->con);
3407
3408         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3409 }
3410
3411 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3412                          char *buf)
3413 {
3414         struct con_driver *con = dev_get_drvdata(dev);
3415
3416         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3417                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3418                          con->desc);
3419
3420 }
3421
3422 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3423 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3424
3425 static struct attribute *con_dev_attrs[] = {
3426         &dev_attr_bind.attr,
3427         &dev_attr_name.attr,
3428         NULL
3429 };
3430
3431 ATTRIBUTE_GROUPS(con_dev);
3432
3433 static int vtconsole_init_device(struct con_driver *con)
3434 {
3435         con->flag |= CON_DRIVER_FLAG_ATTR;
3436         return 0;
3437 }
3438
3439 static void vtconsole_deinit_device(struct con_driver *con)
3440 {
3441         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3442 }
3443
3444 /**
3445  * con_is_bound - checks if driver is bound to the console
3446  * @csw: console driver
3447  *
3448  * RETURNS: zero if unbound, nonzero if bound
3449  *
3450  * Drivers can call this and if zero, they should release
3451  * all resources allocated on con_startup()
3452  */
3453 int con_is_bound(const struct consw *csw)
3454 {
3455         int i, bound = 0;
3456
3457         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3458                 if (con_driver_map[i] == csw) {
3459                         bound = 1;
3460                         break;
3461                 }
3462         }
3463
3464         return bound;
3465 }
3466 EXPORT_SYMBOL(con_is_bound);
3467
3468 /**
3469  * con_debug_enter - prepare the console for the kernel debugger
3470  * @sw: console driver
3471  *
3472  * Called when the console is taken over by the kernel debugger, this
3473  * function needs to save the current console state, then put the console
3474  * into a state suitable for the kernel debugger.
3475  *
3476  * RETURNS:
3477  * Zero on success, nonzero if a failure occurred when trying to prepare
3478  * the console for the debugger.
3479  */
3480 int con_debug_enter(struct vc_data *vc)
3481 {
3482         int ret = 0;
3483
3484         saved_fg_console = fg_console;
3485         saved_last_console = last_console;
3486         saved_want_console = want_console;
3487         saved_vc_mode = vc->vc_mode;
3488         saved_console_blanked = console_blanked;
3489         vc->vc_mode = KD_TEXT;
3490         console_blanked = 0;
3491         if (vc->vc_sw->con_debug_enter)
3492                 ret = vc->vc_sw->con_debug_enter(vc);
3493 #ifdef CONFIG_KGDB_KDB
3494         /* Set the initial LINES variable if it is not already set */
3495         if (vc->vc_rows < 999) {
3496                 int linecount;
3497                 char lns[4];
3498                 const char *setargs[3] = {
3499                         "set",
3500                         "LINES",
3501                         lns,
3502                 };
3503                 if (kdbgetintenv(setargs[0], &linecount)) {
3504                         snprintf(lns, 4, "%i", vc->vc_rows);
3505                         kdb_set(2, setargs);
3506                 }
3507         }
3508         if (vc->vc_cols < 999) {
3509                 int colcount;
3510                 char cols[4];
3511                 const char *setargs[3] = {
3512                         "set",
3513                         "COLUMNS",
3514                         cols,
3515                 };
3516                 if (kdbgetintenv(setargs[0], &colcount)) {
3517                         snprintf(cols, 4, "%i", vc->vc_cols);
3518                         kdb_set(2, setargs);
3519                 }
3520         }
3521 #endif /* CONFIG_KGDB_KDB */
3522         return ret;
3523 }
3524 EXPORT_SYMBOL_GPL(con_debug_enter);
3525
3526 /**
3527  * con_debug_leave - restore console state
3528  * @sw: console driver
3529  *
3530  * Restore the console state to what it was before the kernel debugger
3531  * was invoked.
3532  *
3533  * RETURNS:
3534  * Zero on success, nonzero if a failure occurred when trying to restore
3535  * the console.
3536  */
3537 int con_debug_leave(void)
3538 {
3539         struct vc_data *vc;
3540         int ret = 0;
3541
3542         fg_console = saved_fg_console;
3543         last_console = saved_last_console;
3544         want_console = saved_want_console;
3545         console_blanked = saved_console_blanked;
3546         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3547
3548         vc = vc_cons[fg_console].d;
3549         if (vc->vc_sw->con_debug_leave)
3550                 ret = vc->vc_sw->con_debug_leave(vc);
3551         return ret;
3552 }
3553 EXPORT_SYMBOL_GPL(con_debug_leave);
3554
3555 static int do_register_con_driver(const struct consw *csw, int first, int last)
3556 {
3557         struct module *owner = csw->owner;
3558         struct con_driver *con_driver;
3559         const char *desc;
3560         int i, retval;
3561
3562         WARN_CONSOLE_UNLOCKED();
3563
3564         if (!try_module_get(owner))
3565                 return -ENODEV;
3566
3567         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3568                 con_driver = &registered_con_driver[i];
3569
3570                 /* already registered */
3571                 if (con_driver->con == csw) {
3572                         retval = -EBUSY;
3573                         goto err;
3574                 }
3575         }
3576
3577         desc = csw->con_startup();
3578         if (!desc) {
3579                 retval = -ENODEV;
3580                 goto err;
3581         }
3582
3583         retval = -EINVAL;
3584
3585         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3586                 con_driver = &registered_con_driver[i];
3587
3588                 if (con_driver->con == NULL &&
3589                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3590                         con_driver->con = csw;
3591                         con_driver->desc = desc;
3592                         con_driver->node = i;
3593                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3594                                            CON_DRIVER_FLAG_INIT;
3595                         con_driver->first = first;
3596                         con_driver->last = last;
3597                         retval = 0;
3598                         break;
3599                 }
3600         }
3601
3602         if (retval)
3603                 goto err;
3604
3605         con_driver->dev =
3606                 device_create_with_groups(vtconsole_class, NULL,
3607                                           MKDEV(0, con_driver->node),
3608                                           con_driver, con_dev_groups,
3609                                           "vtcon%i", con_driver->node);
3610         if (IS_ERR(con_driver->dev)) {
3611                 printk(KERN_WARNING "Unable to create device for %s; "
3612                        "errno = %ld\n", con_driver->desc,
3613                        PTR_ERR(con_driver->dev));
3614                 con_driver->dev = NULL;
3615         } else {
3616                 vtconsole_init_device(con_driver);
3617         }
3618
3619 err:
3620         module_put(owner);
3621         return retval;
3622 }
3623
3624
3625 /**
3626  * do_unregister_con_driver - unregister console driver from console layer
3627  * @csw: console driver
3628  *
3629  * DESCRIPTION: All drivers that registers to the console layer must
3630  * call this function upon exit, or if the console driver is in a state
3631  * where it won't be able to handle console services, such as the
3632  * framebuffer console without loaded framebuffer drivers.
3633  *
3634  * The driver must unbind first prior to unregistration.
3635  */
3636 int do_unregister_con_driver(const struct consw *csw)
3637 {
3638         int i;
3639
3640         /* cannot unregister a bound driver */
3641         if (con_is_bound(csw))
3642                 return -EBUSY;
3643
3644         if (csw == conswitchp)
3645                 return -EINVAL;
3646
3647         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3648                 struct con_driver *con_driver = &registered_con_driver[i];
3649
3650                 if (con_driver->con == csw) {
3651                         /*
3652                          * Defer the removal of the sysfs entries since that
3653                          * will acquire the kernfs s_active lock and we can't
3654                          * acquire this lock while holding the console lock:
3655                          * the unbind sysfs entry imposes already the opposite
3656                          * order. Reset con already here to prevent any later
3657                          * lookup to succeed and mark this slot as zombie, so
3658                          * it won't get reused until we complete the removal
3659                          * in the deferred work.
3660                          */
3661                         con_driver->con = NULL;
3662                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3663                         schedule_work(&con_driver_unregister_work);
3664
3665                         return 0;
3666                 }
3667         }
3668
3669         return -ENODEV;
3670 }
3671 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3672
3673 static void con_driver_unregister_callback(struct work_struct *ignored)
3674 {
3675         int i;
3676
3677         console_lock();
3678
3679         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3680                 struct con_driver *con_driver = &registered_con_driver[i];
3681
3682                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3683                         continue;
3684
3685                 console_unlock();
3686
3687                 vtconsole_deinit_device(con_driver);
3688                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3689
3690                 console_lock();
3691
3692                 if (WARN_ON_ONCE(con_driver->con))
3693                         con_driver->con = NULL;
3694                 con_driver->desc = NULL;
3695                 con_driver->dev = NULL;
3696                 con_driver->node = 0;
3697                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3698                 con_driver->flag = 0;
3699                 con_driver->first = 0;
3700                 con_driver->last = 0;
3701         }
3702
3703         console_unlock();
3704 }
3705
3706 /*
3707  *      If we support more console drivers, this function is used
3708  *      when a driver wants to take over some existing consoles
3709  *      and become default driver for newly opened ones.
3710  *
3711  *      do_take_over_console is basically a register followed by unbind
3712  */
3713 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3714 {
3715         int err;
3716
3717         err = do_register_con_driver(csw, first, last);
3718         /*
3719          * If we get an busy error we still want to bind the console driver
3720          * and return success, as we may have unbound the console driver
3721          * but not unregistered it.
3722          */
3723         if (err == -EBUSY)
3724                 err = 0;
3725         if (!err)
3726                 do_bind_con_driver(csw, first, last, deflt);
3727
3728         return err;
3729 }
3730 EXPORT_SYMBOL_GPL(do_take_over_console);
3731
3732
3733 /*
3734  * give_up_console is a wrapper to unregister_con_driver. It will only
3735  * work if driver is fully unbound.
3736  */
3737 void give_up_console(const struct consw *csw)
3738 {
3739         console_lock();
3740         do_unregister_con_driver(csw);
3741         console_unlock();
3742 }
3743
3744 static int __init vtconsole_class_init(void)
3745 {
3746         int i;
3747
3748         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3749         if (IS_ERR(vtconsole_class)) {
3750                 printk(KERN_WARNING "Unable to create vt console class; "
3751                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3752                 vtconsole_class = NULL;
3753         }
3754
3755         /* Add system drivers to sysfs */
3756         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3757                 struct con_driver *con = &registered_con_driver[i];
3758
3759                 if (con->con && !con->dev) {
3760                         con->dev =
3761                                 device_create_with_groups(vtconsole_class, NULL,
3762                                                           MKDEV(0, con->node),
3763                                                           con, con_dev_groups,
3764                                                           "vtcon%i", con->node);
3765
3766                         if (IS_ERR(con->dev)) {
3767                                 printk(KERN_WARNING "Unable to create "
3768                                        "device for %s; errno = %ld\n",
3769                                        con->desc, PTR_ERR(con->dev));
3770                                 con->dev = NULL;
3771                         } else {
3772                                 vtconsole_init_device(con);
3773                         }
3774                 }
3775         }
3776
3777         return 0;
3778 }
3779 postcore_initcall(vtconsole_class_init);
3780
3781 #endif
3782
3783 /*
3784  *      Screen blanking
3785  */
3786
3787 static int set_vesa_blanking(char __user *p)
3788 {
3789         unsigned int mode;
3790
3791         if (get_user(mode, p + 1))
3792                 return -EFAULT;
3793
3794         vesa_blank_mode = (mode < 4) ? mode : 0;
3795         return 0;
3796 }
3797
3798 void do_blank_screen(int entering_gfx)
3799 {
3800         struct vc_data *vc = vc_cons[fg_console].d;
3801         int i;
3802
3803         WARN_CONSOLE_UNLOCKED();
3804
3805         if (console_blanked) {
3806                 if (blank_state == blank_vesa_wait) {
3807                         blank_state = blank_off;
3808                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3809                 }
3810                 return;
3811         }
3812
3813         /* entering graphics mode? */
3814         if (entering_gfx) {
3815                 hide_cursor(vc);
3816                 save_screen(vc);
3817                 vc->vc_sw->con_blank(vc, -1, 1);
3818                 console_blanked = fg_console + 1;
3819                 blank_state = blank_off;
3820                 set_origin(vc);
3821                 return;
3822         }
3823
3824         if (blank_state != blank_normal_wait)
3825                 return;
3826         blank_state = blank_off;
3827
3828         /* don't blank graphics */
3829         if (vc->vc_mode != KD_TEXT) {
3830                 console_blanked = fg_console + 1;
3831                 return;
3832         }
3833
3834         hide_cursor(vc);
3835         del_timer_sync(&console_timer);
3836         blank_timer_expired = 0;
3837
3838         save_screen(vc);
3839         /* In case we need to reset origin, blanking hook returns 1 */
3840         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3841         console_blanked = fg_console + 1;
3842         if (i)
3843                 set_origin(vc);
3844
3845         if (console_blank_hook && console_blank_hook(1))
3846                 return;
3847
3848         if (vesa_off_interval && vesa_blank_mode) {
3849                 blank_state = blank_vesa_wait;
3850                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3851         }
3852         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3853 }
3854 EXPORT_SYMBOL(do_blank_screen);
3855
3856 /*
3857  * Called by timer as well as from vt_console_driver
3858  */
3859 void do_unblank_screen(int leaving_gfx)
3860 {
3861         struct vc_data *vc;
3862
3863         /* This should now always be called from a "sane" (read: can schedule)
3864          * context for the sake of the low level drivers, except in the special
3865          * case of oops_in_progress
3866          */
3867         if (!oops_in_progress)
3868                 might_sleep();
3869
3870         WARN_CONSOLE_UNLOCKED();
3871
3872         ignore_poke = 0;
3873         if (!console_blanked)
3874                 return;
3875         if (!vc_cons_allocated(fg_console)) {
3876                 /* impossible */
3877                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3878                         fg_console + 1);
3879                 return;
3880         }
3881         vc = vc_cons[fg_console].d;
3882         /* Try to unblank in oops case too */
3883         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3884                 return; /* but leave console_blanked != 0 */
3885
3886         if (blankinterval) {
3887                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3888                 blank_state = blank_normal_wait;
3889         }
3890
3891         console_blanked = 0;
3892         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3893                 /* Low-level driver cannot restore -> do it ourselves */
3894                 update_screen(vc);
3895         if (console_blank_hook)
3896                 console_blank_hook(0);
3897         set_palette(vc);
3898         set_cursor(vc);
3899         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3900 }
3901 EXPORT_SYMBOL(do_unblank_screen);
3902
3903 /*
3904  * This is called by the outside world to cause a forced unblank, mostly for
3905  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3906  * call it with 1 as an argument and so force a mode restore... that may kill
3907  * X or at least garbage the screen but would also make the Oops visible...
3908  */
3909 void unblank_screen(void)
3910 {
3911         do_unblank_screen(0);
3912 }
3913
3914 /*
3915  * We defer the timer blanking to work queue so it can take the console mutex
3916  * (console operations can still happen at irq time, but only from printk which
3917  * has the console mutex. Not perfect yet, but better than no locking
3918  */
3919 static void blank_screen_t(unsigned long dummy)
3920 {
3921         if (unlikely(!keventd_up())) {
3922                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3923                 return;
3924         }
3925         blank_timer_expired = 1;
3926         schedule_work(&console_work);
3927 }
3928
3929 void poke_blanked_console(void)
3930 {
3931         WARN_CONSOLE_UNLOCKED();
3932
3933         /* Add this so we quickly catch whoever might call us in a non
3934          * safe context. Nowadays, unblank_screen() isn't to be called in
3935          * atomic contexts and is allowed to schedule (with the special case
3936          * of oops_in_progress, but that isn't of any concern for this
3937          * function. --BenH.
3938          */
3939         might_sleep();
3940
3941         /* This isn't perfectly race free, but a race here would be mostly harmless,
3942          * at worse, we'll do a spurrious blank and it's unlikely
3943          */
3944         del_timer(&console_timer);
3945         blank_timer_expired = 0;
3946
3947         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3948                 return;
3949         if (console_blanked)
3950                 unblank_screen();
3951         else if (blankinterval) {
3952                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3953                 blank_state = blank_normal_wait;
3954         }
3955 }
3956
3957 /*
3958  *      Palettes
3959  */
3960
3961 static void set_palette(struct vc_data *vc)
3962 {
3963         WARN_CONSOLE_UNLOCKED();
3964
3965         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3966                 vc->vc_sw->con_set_palette(vc, color_table);
3967 }
3968
3969 /*
3970  * Load palette into the DAC registers. arg points to a colour
3971  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3972  */
3973
3974 int con_set_cmap(unsigned char __user *arg)
3975 {
3976         int i, j, k;
3977         unsigned char colormap[3*16];
3978
3979         if (copy_from_user(colormap, arg, sizeof(colormap)))
3980                 return -EFAULT;
3981
3982         console_lock();
3983         for (i = k = 0; i < 16; i++) {
3984                 default_red[i] = colormap[k++];
3985                 default_grn[i] = colormap[k++];
3986                 default_blu[i] = colormap[k++];
3987         }
3988         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3989                 if (!vc_cons_allocated(i))
3990                         continue;
3991                 for (j = k = 0; j < 16; j++) {
3992                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3993                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3994                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3995                 }
3996                 set_palette(vc_cons[i].d);
3997         }
3998         console_unlock();
3999
4000         return 0;
4001 }
4002
4003 int con_get_cmap(unsigned char __user *arg)
4004 {
4005         int i, k;
4006         unsigned char colormap[3*16];
4007
4008         console_lock();
4009         for (i = k = 0; i < 16; i++) {
4010                 colormap[k++] = default_red[i];
4011                 colormap[k++] = default_grn[i];
4012                 colormap[k++] = default_blu[i];
4013         }
4014         console_unlock();
4015
4016         if (copy_to_user(arg, colormap, sizeof(colormap)))
4017                 return -EFAULT;
4018
4019         return 0;
4020 }
4021
4022 void reset_palette(struct vc_data *vc)
4023 {
4024         int j, k;
4025         for (j=k=0; j<16; j++) {
4026                 vc->vc_palette[k++] = default_red[j];
4027                 vc->vc_palette[k++] = default_grn[j];
4028                 vc->vc_palette[k++] = default_blu[j];
4029         }
4030         set_palette(vc);
4031 }
4032
4033 /*
4034  *  Font switching
4035  *
4036  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4037  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4038  *  depending on width) reserved for each character which is kinda wasty, but
4039  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4040  *  is up to the actual low-level console-driver convert data into its favorite
4041  *  format (maybe we should add a `fontoffset' field to the `display'
4042  *  structure so we won't have to convert the fontdata all the time.
4043  *  /Jes
4044  */
4045
4046 #define max_font_size 65536
4047
4048 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4049 {
4050         struct console_font font;
4051         int rc = -EINVAL;
4052         int c;
4053
4054         if (op->data) {
4055                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4056                 if (!font.data)
4057                         return -ENOMEM;
4058         } else
4059                 font.data = NULL;
4060
4061         console_lock();
4062         if (vc->vc_mode != KD_TEXT)
4063                 rc = -EINVAL;
4064         else if (vc->vc_sw->con_font_get)
4065                 rc = vc->vc_sw->con_font_get(vc, &font);
4066         else
4067                 rc = -ENOSYS;
4068         console_unlock();
4069
4070         if (rc)
4071                 goto out;
4072
4073         c = (font.width+7)/8 * 32 * font.charcount;
4074
4075         if (op->data && font.charcount > op->charcount)
4076                 rc = -ENOSPC;
4077         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4078                 if (font.width > op->width || font.height > op->height)
4079                         rc = -ENOSPC;
4080         } else {
4081                 if (font.width != 8)
4082                         rc = -EIO;
4083                 else if ((op->height && font.height > op->height) ||
4084                          font.height > 32)
4085                         rc = -ENOSPC;
4086         }
4087         if (rc)
4088                 goto out;
4089
4090         op->height = font.height;
4091         op->width = font.width;
4092         op->charcount = font.charcount;
4093
4094         if (op->data && copy_to_user(op->data, font.data, c))
4095                 rc = -EFAULT;
4096
4097 out:
4098         kfree(font.data);
4099         return rc;
4100 }
4101
4102 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4103 {
4104         struct console_font font;
4105         int rc = -EINVAL;
4106         int size;
4107
4108         if (vc->vc_mode != KD_TEXT)
4109                 return -EINVAL;
4110         if (!op->data)
4111                 return -EINVAL;
4112         if (op->charcount > 512)
4113                 return -EINVAL;
4114         if (!op->height) {              /* Need to guess font height [compat] */
4115                 int h, i;
4116                 u8 __user *charmap = op->data;
4117                 u8 tmp;
4118
4119                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4120                    so that we can get rid of this soon */
4121                 if (!(op->flags & KD_FONT_FLAG_OLD))
4122                         return -EINVAL;
4123                 for (h = 32; h > 0; h--)
4124                         for (i = 0; i < op->charcount; i++) {
4125                                 if (get_user(tmp, &charmap[32*i+h-1]))
4126                                         return -EFAULT;
4127                                 if (tmp)
4128                                         goto nonzero;
4129                         }
4130                 return -EINVAL;
4131         nonzero:
4132                 op->height = h;
4133         }
4134         if (op->width <= 0 || op->width > 32 || op->height > 32)
4135                 return -EINVAL;
4136         size = (op->width+7)/8 * 32 * op->charcount;
4137         if (size > max_font_size)
4138                 return -ENOSPC;
4139         font.charcount = op->charcount;
4140         font.height = op->height;
4141         font.width = op->width;
4142         font.data = memdup_user(op->data, size);
4143         if (IS_ERR(font.data))
4144                 return PTR_ERR(font.data);
4145         console_lock();
4146         if (vc->vc_mode != KD_TEXT)
4147                 rc = -EINVAL;
4148         else if (vc->vc_sw->con_font_set)
4149                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4150         else
4151                 rc = -ENOSYS;
4152         console_unlock();
4153         kfree(font.data);
4154         return rc;
4155 }
4156
4157 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4158 {
4159         struct console_font font = {.width = op->width, .height = op->height};
4160         char name[MAX_FONT_NAME];
4161         char *s = name;
4162         int rc;
4163
4164
4165         if (!op->data)
4166                 s = NULL;
4167         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4168                 return -EFAULT;
4169         else
4170                 name[MAX_FONT_NAME - 1] = 0;
4171
4172         console_lock();
4173         if (vc->vc_mode != KD_TEXT) {
4174                 console_unlock();
4175                 return -EINVAL;
4176         }
4177         if (vc->vc_sw->con_font_default)
4178                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4179         else
4180                 rc = -ENOSYS;
4181         console_unlock();
4182         if (!rc) {
4183                 op->width = font.width;
4184                 op->height = font.height;
4185         }
4186         return rc;
4187 }
4188
4189 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4190 {
4191         int con = op->height;
4192         int rc;
4193
4194
4195         console_lock();
4196         if (vc->vc_mode != KD_TEXT)
4197                 rc = -EINVAL;
4198         else if (!vc->vc_sw->con_font_copy)
4199                 rc = -ENOSYS;
4200         else if (con < 0 || !vc_cons_allocated(con))
4201                 rc = -ENOTTY;
4202         else if (con == vc->vc_num)     /* nothing to do */
4203                 rc = 0;
4204         else
4205                 rc = vc->vc_sw->con_font_copy(vc, con);
4206         console_unlock();
4207         return rc;
4208 }
4209
4210 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4211 {
4212         switch (op->op) {
4213         case KD_FONT_OP_SET:
4214                 return con_font_set(vc, op);
4215         case KD_FONT_OP_GET:
4216                 return con_font_get(vc, op);
4217         case KD_FONT_OP_SET_DEFAULT:
4218                 return con_font_default(vc, op);
4219         case KD_FONT_OP_COPY:
4220                 return con_font_copy(vc, op);
4221         }
4222         return -ENOSYS;
4223 }
4224
4225 /*
4226  *      Interface exported to selection and vcs.
4227  */
4228
4229 /* used by selection */
4230 u16 screen_glyph(struct vc_data *vc, int offset)
4231 {
4232         u16 w = scr_readw(screenpos(vc, offset, 1));
4233         u16 c = w & 0xff;
4234
4235         if (w & vc->vc_hi_font_mask)
4236                 c |= 0x100;
4237         return c;
4238 }
4239 EXPORT_SYMBOL_GPL(screen_glyph);
4240
4241 /* used by vcs - note the word offset */
4242 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4243 {
4244         return screenpos(vc, 2 * w_offset, viewed);
4245 }
4246 EXPORT_SYMBOL_GPL(screen_pos);
4247
4248 void getconsxy(struct vc_data *vc, unsigned char *p)
4249 {
4250         p[0] = vc->vc_x;
4251         p[1] = vc->vc_y;
4252 }
4253
4254 void putconsxy(struct vc_data *vc, unsigned char *p)
4255 {
4256         hide_cursor(vc);
4257         gotoxy(vc, p[0], p[1]);
4258         set_cursor(vc);
4259 }
4260
4261 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4262 {
4263         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4264                 return softcursor_original;
4265         return scr_readw(org);
4266 }
4267
4268 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4269 {
4270         scr_writew(val, org);
4271         if ((unsigned long)org == vc->vc_pos) {
4272                 softcursor_original = -1;
4273                 add_softcursor(vc);
4274         }
4275 }
4276
4277 void vcs_scr_updated(struct vc_data *vc)
4278 {
4279         notify_update(vc);
4280 }
4281
4282 /*
4283  *      Visible symbols for modules
4284  */
4285
4286 EXPORT_SYMBOL(color_table);
4287 EXPORT_SYMBOL(default_red);
4288 EXPORT_SYMBOL(default_grn);
4289 EXPORT_SYMBOL(default_blu);
4290 EXPORT_SYMBOL(update_region);
4291 EXPORT_SYMBOL(redraw_screen);
4292 EXPORT_SYMBOL(vc_resize);
4293 EXPORT_SYMBOL(fg_console);
4294 EXPORT_SYMBOL(console_blank_hook);
4295 EXPORT_SYMBOL(console_blanked);
4296 EXPORT_SYMBOL(vc_cons);
4297 EXPORT_SYMBOL(global_cursor_default);
4298 #ifndef VT_SINGLE_DRIVER
4299 EXPORT_SYMBOL(give_up_console);
4300 #endif