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, max = c->r;
1264         if (c->g > max)
1265                 max = c->g;
1266         if (c->b > max)
1267                 max = c->b;
1268         hue = (c->r > max/2 ? 4 : 0)
1269             | (c->g > max/2 ? 2 : 0)
1270             | (c->b > max/2 ? 1 : 0);
1271         if (hue == 7 && max <= 0x55)
1272                 hue = 0, vc->vc_intensity = 2;
1273         else
1274                 vc->vc_intensity = (max > 0xaa) + 1;
1275         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1276 }
1277
1278 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1279 {
1280         /* For backgrounds, err on the dark side. */
1281         vc->vc_color = (vc->vc_color & 0x0f)
1282                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1283 }
1284
1285 /*
1286  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1287  * and thus need to be detected and ignored by hand. Strictly speaking, that
1288  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1289  * no one produces such codes and almost no one accepts them.
1290  *
1291  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1292  * supporting them.
1293  */
1294 static int vc_t416_color(struct vc_data *vc, int i,
1295                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1296 {
1297         struct rgb c;
1298
1299         i++;
1300         if (i > vc->vc_npar)
1301                 return i;
1302
1303         if (vc->vc_par[i] == 5 && i < vc->vc_npar) {
1304                 /* 256 colours -- ubiquitous */
1305                 i++;
1306                 rgb_from_256(vc->vc_par[i], &c);
1307         } else if (vc->vc_par[i] == 2 && i <= vc->vc_npar + 3) {
1308                 /* 24 bit -- extremely rare */
1309                 c.r = vc->vc_par[i + 1];
1310                 c.g = vc->vc_par[i + 2];
1311                 c.b = vc->vc_par[i + 3];
1312                 i += 3;
1313         } else
1314                 return i;
1315
1316         set_color(vc, &c);
1317
1318         return i;
1319 }
1320
1321 /* console_lock is held */
1322 static void csi_m(struct vc_data *vc)
1323 {
1324         int i;
1325
1326         for (i = 0; i <= vc->vc_npar; i++)
1327                 switch (vc->vc_par[i]) {
1328                         case 0: /* all attributes off */
1329                                 default_attr(vc);
1330                                 break;
1331                         case 1:
1332                                 vc->vc_intensity = 2;
1333                                 break;
1334                         case 2:
1335                                 vc->vc_intensity = 0;
1336                                 break;
1337                         case 3:
1338                                 vc->vc_italic = 1;
1339                                 break;
1340                         case 4:
1341                                 vc->vc_underline = 1;
1342                                 break;
1343                         case 5:
1344                                 vc->vc_blink = 1;
1345                                 break;
1346                         case 7:
1347                                 vc->vc_reverse = 1;
1348                                 break;
1349                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1350                                   * Select primary font, don't display
1351                                   * control chars if defined, don't set
1352                                   * bit 8 on output.
1353                                   */
1354                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1355                                                 ? vc->vc_G0_charset
1356                                                 : vc->vc_G1_charset, vc);
1357                                 vc->vc_disp_ctrl = 0;
1358                                 vc->vc_toggle_meta = 0;
1359                                 break;
1360                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1361                                   * Select first alternate font, lets
1362                                   * chars < 32 be displayed as ROM chars.
1363                                   */
1364                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1365                                 vc->vc_disp_ctrl = 1;
1366                                 vc->vc_toggle_meta = 0;
1367                                 break;
1368                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1369                                   * Select second alternate font, toggle
1370                                   * high bit before displaying as ROM char.
1371                                   */
1372                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1373                                 vc->vc_disp_ctrl = 1;
1374                                 vc->vc_toggle_meta = 1;
1375                                 break;
1376                         case 21:
1377                         case 22:
1378                                 vc->vc_intensity = 1;
1379                                 break;
1380                         case 23:
1381                                 vc->vc_italic = 0;
1382                                 break;
1383                         case 24:
1384                                 vc->vc_underline = 0;
1385                                 break;
1386                         case 25:
1387                                 vc->vc_blink = 0;
1388                                 break;
1389                         case 27:
1390                                 vc->vc_reverse = 0;
1391                                 break;
1392                         case 38:
1393                                 i = vc_t416_color(vc, i, rgb_foreground);
1394                                 break;
1395                         case 48:
1396                                 i = vc_t416_color(vc, i, rgb_background);
1397                                 break;
1398                         case 39:
1399                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1400                                 break;
1401                         case 49:
1402                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1403                                 break;
1404                         default:
1405                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1406                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1407                                                 | (vc->vc_color & 0xf0);
1408                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1409                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1410                                                 | (vc->vc_color & 0x0f);
1411                                 break;
1412                 }
1413         update_attr(vc);
1414 }
1415
1416 static void respond_string(const char *p, struct tty_port *port)
1417 {
1418         while (*p) {
1419                 tty_insert_flip_char(port, *p, 0);
1420                 p++;
1421         }
1422         tty_schedule_flip(port);
1423 }
1424
1425 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1426 {
1427         char buf[40];
1428
1429         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1430         respond_string(buf, tty->port);
1431 }
1432
1433 static inline void status_report(struct tty_struct *tty)
1434 {
1435         respond_string("\033[0n", tty->port);   /* Terminal ok */
1436 }
1437
1438 static inline void respond_ID(struct tty_struct *tty)
1439 {
1440         respond_string(VT102ID, tty->port);
1441 }
1442
1443 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1444 {
1445         char buf[8];
1446
1447         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1448                 (char)('!' + mry));
1449         respond_string(buf, tty->port);
1450 }
1451
1452 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1453 int mouse_reporting(void)
1454 {
1455         return vc_cons[fg_console].d->vc_report_mouse;
1456 }
1457
1458 /* console_lock is held */
1459 static void set_mode(struct vc_data *vc, int on_off)
1460 {
1461         int i;
1462
1463         for (i = 0; i <= vc->vc_npar; i++)
1464                 if (vc->vc_ques) {
1465                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1466                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1467                                 if (on_off)
1468                                         set_kbd(vc, decckm);
1469                                 else
1470                                         clr_kbd(vc, decckm);
1471                                 break;
1472                         case 3: /* 80/132 mode switch unimplemented */
1473                                 vc->vc_deccolm = on_off;
1474 #if 0
1475                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1476                                 /* this alone does not suffice; some user mode
1477                                    utility has to change the hardware regs */
1478 #endif
1479                                 break;
1480                         case 5:                 /* Inverted screen on/off */
1481                                 if (vc->vc_decscnm != on_off) {
1482                                         vc->vc_decscnm = on_off;
1483                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1484                                         update_attr(vc);
1485                                 }
1486                                 break;
1487                         case 6:                 /* Origin relative/absolute */
1488                                 vc->vc_decom = on_off;
1489                                 gotoxay(vc, 0, 0);
1490                                 break;
1491                         case 7:                 /* Autowrap on/off */
1492                                 vc->vc_decawm = on_off;
1493                                 break;
1494                         case 8:                 /* Autorepeat on/off */
1495                                 if (on_off)
1496                                         set_kbd(vc, decarm);
1497                                 else
1498                                         clr_kbd(vc, decarm);
1499                                 break;
1500                         case 9:
1501                                 vc->vc_report_mouse = on_off ? 1 : 0;
1502                                 break;
1503                         case 25:                /* Cursor on/off */
1504                                 vc->vc_deccm = on_off;
1505                                 break;
1506                         case 1000:
1507                                 vc->vc_report_mouse = on_off ? 2 : 0;
1508                                 break;
1509                         }
1510                 } else {
1511                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1512                         case 3:                 /* Monitor (display ctrls) */
1513                                 vc->vc_disp_ctrl = on_off;
1514                                 break;
1515                         case 4:                 /* Insert Mode on/off */
1516                                 vc->vc_decim = on_off;
1517                                 break;
1518                         case 20:                /* Lf, Enter == CrLf/Lf */
1519                                 if (on_off)
1520                                         set_kbd(vc, lnm);
1521                                 else
1522                                         clr_kbd(vc, lnm);
1523                                 break;
1524                         }
1525                 }
1526 }
1527
1528 /* console_lock is held */
1529 static void setterm_command(struct vc_data *vc)
1530 {
1531         switch(vc->vc_par[0]) {
1532                 case 1: /* set color for underline mode */
1533                         if (vc->vc_can_do_color &&
1534                                         vc->vc_par[1] < 16) {
1535                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1536                                 if (vc->vc_underline)
1537                                         update_attr(vc);
1538                         }
1539                         break;
1540                 case 2: /* set color for half intensity mode */
1541                         if (vc->vc_can_do_color &&
1542                                         vc->vc_par[1] < 16) {
1543                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1544                                 if (vc->vc_intensity == 0)
1545                                         update_attr(vc);
1546                         }
1547                         break;
1548                 case 8: /* store colors as defaults */
1549                         vc->vc_def_color = vc->vc_attr;
1550                         if (vc->vc_hi_font_mask == 0x100)
1551                                 vc->vc_def_color >>= 1;
1552                         default_attr(vc);
1553                         update_attr(vc);
1554                         break;
1555                 case 9: /* set blanking interval */
1556                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1557                         poke_blanked_console();
1558                         break;
1559                 case 10: /* set bell frequency in Hz */
1560                         if (vc->vc_npar >= 1)
1561                                 vc->vc_bell_pitch = vc->vc_par[1];
1562                         else
1563                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1564                         break;
1565                 case 11: /* set bell duration in msec */
1566                         if (vc->vc_npar >= 1)
1567                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1568                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1569                         else
1570                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1571                         break;
1572                 case 12: /* bring specified console to the front */
1573                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1574                                 set_console(vc->vc_par[1] - 1);
1575                         break;
1576                 case 13: /* unblank the screen */
1577                         poke_blanked_console();
1578                         break;
1579                 case 14: /* set vesa powerdown interval */
1580                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1581                         break;
1582                 case 15: /* activate the previous console */
1583                         set_console(last_console);
1584                         break;
1585                 case 16: /* set cursor blink duration in msec */
1586                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1587                                         vc->vc_par[1] <= USHRT_MAX)
1588                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1589                         else
1590                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1591                         break;
1592         }
1593 }
1594
1595 /* console_lock is held */
1596 static void csi_at(struct vc_data *vc, unsigned int nr)
1597 {
1598         if (nr > vc->vc_cols - vc->vc_x)
1599                 nr = vc->vc_cols - vc->vc_x;
1600         else if (!nr)
1601                 nr = 1;
1602         insert_char(vc, nr);
1603 }
1604
1605 /* console_lock is held */
1606 static void csi_L(struct vc_data *vc, unsigned int nr)
1607 {
1608         if (nr > vc->vc_rows - vc->vc_y)
1609                 nr = vc->vc_rows - vc->vc_y;
1610         else if (!nr)
1611                 nr = 1;
1612         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1613         vc->vc_need_wrap = 0;
1614 }
1615
1616 /* console_lock is held */
1617 static void csi_P(struct vc_data *vc, unsigned int nr)
1618 {
1619         if (nr > vc->vc_cols - vc->vc_x)
1620                 nr = vc->vc_cols - vc->vc_x;
1621         else if (!nr)
1622                 nr = 1;
1623         delete_char(vc, nr);
1624 }
1625
1626 /* console_lock is held */
1627 static void csi_M(struct vc_data *vc, unsigned int nr)
1628 {
1629         if (nr > vc->vc_rows - vc->vc_y)
1630                 nr = vc->vc_rows - vc->vc_y;
1631         else if (!nr)
1632                 nr=1;
1633         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1634         vc->vc_need_wrap = 0;
1635 }
1636
1637 /* console_lock is held (except via vc_init->reset_terminal */
1638 static void save_cur(struct vc_data *vc)
1639 {
1640         vc->vc_saved_x          = vc->vc_x;
1641         vc->vc_saved_y          = vc->vc_y;
1642         vc->vc_s_intensity      = vc->vc_intensity;
1643         vc->vc_s_italic         = vc->vc_italic;
1644         vc->vc_s_underline      = vc->vc_underline;
1645         vc->vc_s_blink          = vc->vc_blink;
1646         vc->vc_s_reverse        = vc->vc_reverse;
1647         vc->vc_s_charset        = vc->vc_charset;
1648         vc->vc_s_color          = vc->vc_color;
1649         vc->vc_saved_G0         = vc->vc_G0_charset;
1650         vc->vc_saved_G1         = vc->vc_G1_charset;
1651 }
1652
1653 /* console_lock is held */
1654 static void restore_cur(struct vc_data *vc)
1655 {
1656         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1657         vc->vc_intensity        = vc->vc_s_intensity;
1658         vc->vc_italic           = vc->vc_s_italic;
1659         vc->vc_underline        = vc->vc_s_underline;
1660         vc->vc_blink            = vc->vc_s_blink;
1661         vc->vc_reverse          = vc->vc_s_reverse;
1662         vc->vc_charset          = vc->vc_s_charset;
1663         vc->vc_color            = vc->vc_s_color;
1664         vc->vc_G0_charset       = vc->vc_saved_G0;
1665         vc->vc_G1_charset       = vc->vc_saved_G1;
1666         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1667         update_attr(vc);
1668         vc->vc_need_wrap = 0;
1669 }
1670
1671 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1672         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1673         ESpalette, ESosc };
1674
1675 /* console_lock is held (except via vc_init()) */
1676 static void reset_terminal(struct vc_data *vc, int do_clear)
1677 {
1678         vc->vc_top              = 0;
1679         vc->vc_bottom           = vc->vc_rows;
1680         vc->vc_state            = ESnormal;
1681         vc->vc_ques             = 0;
1682         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1683         vc->vc_G0_charset       = LAT1_MAP;
1684         vc->vc_G1_charset       = GRAF_MAP;
1685         vc->vc_charset          = 0;
1686         vc->vc_need_wrap        = 0;
1687         vc->vc_report_mouse     = 0;
1688         vc->vc_utf              = default_utf8;
1689         vc->vc_utf_count        = 0;
1690
1691         vc->vc_disp_ctrl        = 0;
1692         vc->vc_toggle_meta      = 0;
1693
1694         vc->vc_decscnm          = 0;
1695         vc->vc_decom            = 0;
1696         vc->vc_decawm           = 1;
1697         vc->vc_deccm            = global_cursor_default;
1698         vc->vc_decim            = 0;
1699
1700         vt_reset_keyboard(vc->vc_num);
1701
1702         vc->vc_cursor_type = cur_default;
1703         vc->vc_complement_mask = vc->vc_s_complement_mask;
1704
1705         default_attr(vc);
1706         update_attr(vc);
1707
1708         vc->vc_tab_stop[0]      = 0x01010100;
1709         vc->vc_tab_stop[1]      =
1710         vc->vc_tab_stop[2]      =
1711         vc->vc_tab_stop[3]      =
1712         vc->vc_tab_stop[4]      =
1713         vc->vc_tab_stop[5]      =
1714         vc->vc_tab_stop[6]      =
1715         vc->vc_tab_stop[7]      = 0x01010101;
1716
1717         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1718         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1719         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1720
1721         gotoxy(vc, 0, 0);
1722         save_cur(vc);
1723         if (do_clear)
1724             csi_J(vc, 2);
1725 }
1726
1727 /* console_lock is held */
1728 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1729 {
1730         /*
1731          *  Control characters can be used in the _middle_
1732          *  of an escape sequence.
1733          */
1734         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1735                 return;
1736         switch (c) {
1737         case 0:
1738                 return;
1739         case 7:
1740                 if (vc->vc_state == ESosc)
1741                         vc->vc_state = ESnormal;
1742                 else if (vc->vc_bell_duration)
1743                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1744                 return;
1745         case 8:
1746                 bs(vc);
1747                 return;
1748         case 9:
1749                 vc->vc_pos -= (vc->vc_x << 1);
1750                 while (vc->vc_x < vc->vc_cols - 1) {
1751                         vc->vc_x++;
1752                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1753                                 break;
1754                 }
1755                 vc->vc_pos += (vc->vc_x << 1);
1756                 notify_write(vc, '\t');
1757                 return;
1758         case 10: case 11: case 12:
1759                 lf(vc);
1760                 if (!is_kbd(vc, lnm))
1761                         return;
1762         case 13:
1763                 cr(vc);
1764                 return;
1765         case 14:
1766                 vc->vc_charset = 1;
1767                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1768                 vc->vc_disp_ctrl = 1;
1769                 return;
1770         case 15:
1771                 vc->vc_charset = 0;
1772                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1773                 vc->vc_disp_ctrl = 0;
1774                 return;
1775         case 24: case 26:
1776                 vc->vc_state = ESnormal;
1777                 return;
1778         case 27:
1779                 vc->vc_state = ESesc;
1780                 return;
1781         case 127:
1782                 del(vc);
1783                 return;
1784         case 128+27:
1785                 vc->vc_state = ESsquare;
1786                 return;
1787         }
1788         switch(vc->vc_state) {
1789         case ESesc:
1790                 vc->vc_state = ESnormal;
1791                 switch (c) {
1792                 case '[':
1793                         vc->vc_state = ESsquare;
1794                         return;
1795                 case ']':
1796                         vc->vc_state = ESnonstd;
1797                         return;
1798                 case '%':
1799                         vc->vc_state = ESpercent;
1800                         return;
1801                 case 'E':
1802                         cr(vc);
1803                         lf(vc);
1804                         return;
1805                 case 'M':
1806                         ri(vc);
1807                         return;
1808                 case 'D':
1809                         lf(vc);
1810                         return;
1811                 case 'H':
1812                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1813                         return;
1814                 case 'Z':
1815                         respond_ID(tty);
1816                         return;
1817                 case '7':
1818                         save_cur(vc);
1819                         return;
1820                 case '8':
1821                         restore_cur(vc);
1822                         return;
1823                 case '(':
1824                         vc->vc_state = ESsetG0;
1825                         return;
1826                 case ')':
1827                         vc->vc_state = ESsetG1;
1828                         return;
1829                 case '#':
1830                         vc->vc_state = EShash;
1831                         return;
1832                 case 'c':
1833                         reset_terminal(vc, 1);
1834                         return;
1835                 case '>':  /* Numeric keypad */
1836                         clr_kbd(vc, kbdapplic);
1837                         return;
1838                 case '=':  /* Appl. keypad */
1839                         set_kbd(vc, kbdapplic);
1840                         return;
1841                 }
1842                 return;
1843         case ESnonstd:
1844                 if (c=='P') {   /* palette escape sequence */
1845                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1846                                 vc->vc_par[vc->vc_npar] = 0;
1847                         vc->vc_npar = 0;
1848                         vc->vc_state = ESpalette;
1849                         return;
1850                 } else if (c=='R') {   /* reset palette */
1851                         reset_palette(vc);
1852                         vc->vc_state = ESnormal;
1853                 } else if (c>='0' && c<='9')
1854                         vc->vc_state = ESosc;
1855                 else
1856                         vc->vc_state = ESnormal;
1857                 return;
1858         case ESpalette:
1859                 if (isxdigit(c)) {
1860                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1861                         if (vc->vc_npar == 7) {
1862                                 int i = vc->vc_par[0] * 3, j = 1;
1863                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1864                                 vc->vc_palette[i++] += vc->vc_par[j++];
1865                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1866                                 vc->vc_palette[i++] += vc->vc_par[j++];
1867                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1868                                 vc->vc_palette[i] += vc->vc_par[j];
1869                                 set_palette(vc);
1870                                 vc->vc_state = ESnormal;
1871                         }
1872                 } else
1873                         vc->vc_state = ESnormal;
1874                 return;
1875         case ESsquare:
1876                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1877                         vc->vc_par[vc->vc_npar] = 0;
1878                 vc->vc_npar = 0;
1879                 vc->vc_state = ESgetpars;
1880                 if (c == '[') { /* Function key */
1881                         vc->vc_state=ESfunckey;
1882                         return;
1883                 }
1884                 vc->vc_ques = (c == '?');
1885                 if (vc->vc_ques)
1886                         return;
1887         case ESgetpars:
1888                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1889                         vc->vc_npar++;
1890                         return;
1891                 } else if (c>='0' && c<='9') {
1892                         vc->vc_par[vc->vc_npar] *= 10;
1893                         vc->vc_par[vc->vc_npar] += c - '0';
1894                         return;
1895                 }
1896                 vc->vc_state = ESnormal;
1897                 switch(c) {
1898                 case 'h':
1899                         set_mode(vc, 1);
1900                         return;
1901                 case 'l':
1902                         set_mode(vc, 0);
1903                         return;
1904                 case 'c':
1905                         if (vc->vc_ques) {
1906                                 if (vc->vc_par[0])
1907                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1908                                 else
1909                                         vc->vc_cursor_type = cur_default;
1910                                 return;
1911                         }
1912                         break;
1913                 case 'm':
1914                         if (vc->vc_ques) {
1915                                 clear_selection();
1916                                 if (vc->vc_par[0])
1917                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1918                                 else
1919                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1920                                 return;
1921                         }
1922                         break;
1923                 case 'n':
1924                         if (!vc->vc_ques) {
1925                                 if (vc->vc_par[0] == 5)
1926                                         status_report(tty);
1927                                 else if (vc->vc_par[0] == 6)
1928                                         cursor_report(vc, tty);
1929                         }
1930                         return;
1931                 }
1932                 if (vc->vc_ques) {
1933                         vc->vc_ques = 0;
1934                         return;
1935                 }
1936                 switch(c) {
1937                 case 'G': case '`':
1938                         if (vc->vc_par[0])
1939                                 vc->vc_par[0]--;
1940                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1941                         return;
1942                 case 'A':
1943                         if (!vc->vc_par[0])
1944                                 vc->vc_par[0]++;
1945                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1946                         return;
1947                 case 'B': case 'e':
1948                         if (!vc->vc_par[0])
1949                                 vc->vc_par[0]++;
1950                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1951                         return;
1952                 case 'C': case 'a':
1953                         if (!vc->vc_par[0])
1954                                 vc->vc_par[0]++;
1955                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1956                         return;
1957                 case 'D':
1958                         if (!vc->vc_par[0])
1959                                 vc->vc_par[0]++;
1960                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1961                         return;
1962                 case 'E':
1963                         if (!vc->vc_par[0])
1964                                 vc->vc_par[0]++;
1965                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1966                         return;
1967                 case 'F':
1968                         if (!vc->vc_par[0])
1969                                 vc->vc_par[0]++;
1970                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1971                         return;
1972                 case 'd':
1973                         if (vc->vc_par[0])
1974                                 vc->vc_par[0]--;
1975                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1976                         return;
1977                 case 'H': case 'f':
1978                         if (vc->vc_par[0])
1979                                 vc->vc_par[0]--;
1980                         if (vc->vc_par[1])
1981                                 vc->vc_par[1]--;
1982                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1983                         return;
1984                 case 'J':
1985                         csi_J(vc, vc->vc_par[0]);
1986                         return;
1987                 case 'K':
1988                         csi_K(vc, vc->vc_par[0]);
1989                         return;
1990                 case 'L':
1991                         csi_L(vc, vc->vc_par[0]);
1992                         return;
1993                 case 'M':
1994                         csi_M(vc, vc->vc_par[0]);
1995                         return;
1996                 case 'P':
1997                         csi_P(vc, vc->vc_par[0]);
1998                         return;
1999                 case 'c':
2000                         if (!vc->vc_par[0])
2001                                 respond_ID(tty);
2002                         return;
2003                 case 'g':
2004                         if (!vc->vc_par[0])
2005                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2006                         else if (vc->vc_par[0] == 3) {
2007                                 vc->vc_tab_stop[0] =
2008                                         vc->vc_tab_stop[1] =
2009                                         vc->vc_tab_stop[2] =
2010                                         vc->vc_tab_stop[3] =
2011                                         vc->vc_tab_stop[4] =
2012                                         vc->vc_tab_stop[5] =
2013                                         vc->vc_tab_stop[6] =
2014                                         vc->vc_tab_stop[7] = 0;
2015                         }
2016                         return;
2017                 case 'm':
2018                         csi_m(vc);
2019                         return;
2020                 case 'q': /* DECLL - but only 3 leds */
2021                         /* map 0,1,2,3 to 0,1,2,4 */
2022                         if (vc->vc_par[0] < 4)
2023                                 vt_set_led_state(vc->vc_num,
2024                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2025                         return;
2026                 case 'r':
2027                         if (!vc->vc_par[0])
2028                                 vc->vc_par[0]++;
2029                         if (!vc->vc_par[1])
2030                                 vc->vc_par[1] = vc->vc_rows;
2031                         /* Minimum allowed region is 2 lines */
2032                         if (vc->vc_par[0] < vc->vc_par[1] &&
2033                             vc->vc_par[1] <= vc->vc_rows) {
2034                                 vc->vc_top = vc->vc_par[0] - 1;
2035                                 vc->vc_bottom = vc->vc_par[1];
2036                                 gotoxay(vc, 0, 0);
2037                         }
2038                         return;
2039                 case 's':
2040                         save_cur(vc);
2041                         return;
2042                 case 'u':
2043                         restore_cur(vc);
2044                         return;
2045                 case 'X':
2046                         csi_X(vc, vc->vc_par[0]);
2047                         return;
2048                 case '@':
2049                         csi_at(vc, vc->vc_par[0]);
2050                         return;
2051                 case ']': /* setterm functions */
2052                         setterm_command(vc);
2053                         return;
2054                 }
2055                 return;
2056         case ESpercent:
2057                 vc->vc_state = ESnormal;
2058                 switch (c) {
2059                 case '@':  /* defined in ISO 2022 */
2060                         vc->vc_utf = 0;
2061                         return;
2062                 case 'G':  /* prelim official escape code */
2063                 case '8':  /* retained for compatibility */
2064                         vc->vc_utf = 1;
2065                         return;
2066                 }
2067                 return;
2068         case ESfunckey:
2069                 vc->vc_state = ESnormal;
2070                 return;
2071         case EShash:
2072                 vc->vc_state = ESnormal;
2073                 if (c == '8') {
2074                         /* DEC screen alignment test. kludge :-) */
2075                         vc->vc_video_erase_char =
2076                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2077                         csi_J(vc, 2);
2078                         vc->vc_video_erase_char =
2079                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2080                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2081                 }
2082                 return;
2083         case ESsetG0:
2084                 if (c == '0')
2085                         vc->vc_G0_charset = GRAF_MAP;
2086                 else if (c == 'B')
2087                         vc->vc_G0_charset = LAT1_MAP;
2088                 else if (c == 'U')
2089                         vc->vc_G0_charset = IBMPC_MAP;
2090                 else if (c == 'K')
2091                         vc->vc_G0_charset = USER_MAP;
2092                 if (vc->vc_charset == 0)
2093                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2094                 vc->vc_state = ESnormal;
2095                 return;
2096         case ESsetG1:
2097                 if (c == '0')
2098                         vc->vc_G1_charset = GRAF_MAP;
2099                 else if (c == 'B')
2100                         vc->vc_G1_charset = LAT1_MAP;
2101                 else if (c == 'U')
2102                         vc->vc_G1_charset = IBMPC_MAP;
2103                 else if (c == 'K')
2104                         vc->vc_G1_charset = USER_MAP;
2105                 if (vc->vc_charset == 1)
2106                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2107                 vc->vc_state = ESnormal;
2108                 return;
2109         case ESosc:
2110                 return;
2111         default:
2112                 vc->vc_state = ESnormal;
2113         }
2114 }
2115
2116 /* is_double_width() is based on the wcwidth() implementation by
2117  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2118  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2119  */
2120 struct interval {
2121         uint32_t first;
2122         uint32_t last;
2123 };
2124
2125 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2126 {
2127         int min = 0;
2128         int mid;
2129
2130         if (ucs < table[0].first || ucs > table[max].last)
2131                 return 0;
2132         while (max >= min) {
2133                 mid = (min + max) / 2;
2134                 if (ucs > table[mid].last)
2135                         min = mid + 1;
2136                 else if (ucs < table[mid].first)
2137                         max = mid - 1;
2138                 else
2139                         return 1;
2140         }
2141         return 0;
2142 }
2143
2144 static int is_double_width(uint32_t ucs)
2145 {
2146         static const struct interval double_width[] = {
2147                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2148                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2149                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2150                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2151         };
2152         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2153 }
2154
2155 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2156                 unsigned long draw_to, int *draw_x)
2157 {
2158         if (*draw_x < 0)
2159                 return;
2160
2161         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2162                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2163         *draw_x = -1;
2164 }
2165
2166 /* acquires console_lock */
2167 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2168 {
2169         int c, tc, ok, n = 0, draw_x = -1;
2170         unsigned int currcons;
2171         unsigned long draw_from = 0, draw_to = 0;
2172         struct vc_data *vc;
2173         unsigned char vc_attr;
2174         struct vt_notifier_param param;
2175         uint8_t rescan;
2176         uint8_t inverse;
2177         uint8_t width;
2178         u16 himask, charmask;
2179
2180         if (in_interrupt())
2181                 return count;
2182
2183         might_sleep();
2184
2185         console_lock();
2186         vc = tty->driver_data;
2187         if (vc == NULL) {
2188                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2189                 console_unlock();
2190                 return 0;
2191         }
2192
2193         currcons = vc->vc_num;
2194         if (!vc_cons_allocated(currcons)) {
2195                 /* could this happen? */
2196                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2197                 console_unlock();
2198                 return 0;
2199         }
2200
2201         himask = vc->vc_hi_font_mask;
2202         charmask = himask ? 0x1ff : 0xff;
2203
2204         /* undraw cursor first */
2205         if (IS_FG(vc))
2206                 hide_cursor(vc);
2207
2208         param.vc = vc;
2209
2210         while (!tty->stopped && count) {
2211                 int orig = *buf;
2212                 c = orig;
2213                 buf++;
2214                 n++;
2215                 count--;
2216                 rescan = 0;
2217                 inverse = 0;
2218                 width = 1;
2219
2220                 /* Do no translation at all in control states */
2221                 if (vc->vc_state != ESnormal) {
2222                         tc = c;
2223                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2224                     /* Combine UTF-8 into Unicode in vc_utf_char.
2225                      * vc_utf_count is the number of continuation bytes still
2226                      * expected to arrive.
2227                      * vc_npar is the number of continuation bytes arrived so
2228                      * far
2229                      */
2230 rescan_last_byte:
2231                     if ((c & 0xc0) == 0x80) {
2232                         /* Continuation byte received */
2233                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2234                         if (vc->vc_utf_count) {
2235                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2236                             vc->vc_npar++;
2237                             if (--vc->vc_utf_count) {
2238                                 /* Still need some bytes */
2239                                 continue;
2240                             }
2241                             /* Got a whole character */
2242                             c = vc->vc_utf_char;
2243                             /* Reject overlong sequences */
2244                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2245                                         c > utf8_length_changes[vc->vc_npar])
2246                                 c = 0xfffd;
2247                         } else {
2248                             /* Unexpected continuation byte */
2249                             vc->vc_utf_count = 0;
2250                             c = 0xfffd;
2251                         }
2252                     } else {
2253                         /* Single ASCII byte or first byte of a sequence received */
2254                         if (vc->vc_utf_count) {
2255                             /* Continuation byte expected */
2256                             rescan = 1;
2257                             vc->vc_utf_count = 0;
2258                             c = 0xfffd;
2259                         } else if (c > 0x7f) {
2260                             /* First byte of a multibyte sequence received */
2261                             vc->vc_npar = 0;
2262                             if ((c & 0xe0) == 0xc0) {
2263                                 vc->vc_utf_count = 1;
2264                                 vc->vc_utf_char = (c & 0x1f);
2265                             } else if ((c & 0xf0) == 0xe0) {
2266                                 vc->vc_utf_count = 2;
2267                                 vc->vc_utf_char = (c & 0x0f);
2268                             } else if ((c & 0xf8) == 0xf0) {
2269                                 vc->vc_utf_count = 3;
2270                                 vc->vc_utf_char = (c & 0x07);
2271                             } else if ((c & 0xfc) == 0xf8) {
2272                                 vc->vc_utf_count = 4;
2273                                 vc->vc_utf_char = (c & 0x03);
2274                             } else if ((c & 0xfe) == 0xfc) {
2275                                 vc->vc_utf_count = 5;
2276                                 vc->vc_utf_char = (c & 0x01);
2277                             } else {
2278                                 /* 254 and 255 are invalid */
2279                                 c = 0xfffd;
2280                             }
2281                             if (vc->vc_utf_count) {
2282                                 /* Still need some bytes */
2283                                 continue;
2284                             }
2285                         }
2286                         /* Nothing to do if an ASCII byte was received */
2287                     }
2288                     /* End of UTF-8 decoding. */
2289                     /* c is the received character, or U+FFFD for invalid sequences. */
2290                     /* Replace invalid Unicode code points with U+FFFD too */
2291                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2292                         c = 0xfffd;
2293                     tc = c;
2294                 } else {        /* no utf or alternate charset mode */
2295                     tc = vc_translate(vc, c);
2296                 }
2297
2298                 param.c = tc;
2299                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2300                                         &param) == NOTIFY_STOP)
2301                         continue;
2302
2303                 /* If the original code was a control character we
2304                  * only allow a glyph to be displayed if the code is
2305                  * not normally used (such as for cursor movement) or
2306                  * if the disp_ctrl mode has been explicitly enabled.
2307                  * Certain characters (as given by the CTRL_ALWAYS
2308                  * bitmap) are always displayed as control characters,
2309                  * as the console would be pretty useless without
2310                  * them; to display an arbitrary font position use the
2311                  * direct-to-font zone in UTF-8 mode.
2312                  */
2313                 ok = tc && (c >= 32 ||
2314                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2315                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2316                         && (c != 127 || vc->vc_disp_ctrl)
2317                         && (c != 128+27);
2318
2319                 if (vc->vc_state == ESnormal && ok) {
2320                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2321                                 if (is_double_width(c))
2322                                         width = 2;
2323                         }
2324                         /* Now try to find out how to display it */
2325                         tc = conv_uni_to_pc(vc, tc);
2326                         if (tc & ~charmask) {
2327                                 if (tc == -1 || tc == -2) {
2328                                     continue; /* nothing to display */
2329                                 }
2330                                 /* Glyph not found */
2331                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2332                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2333                                        This would make absolutely no sense with Unicode in mind,
2334                                        but do this for ASCII characters since a font may lack
2335                                        Unicode mapping info and we don't want to end up with
2336                                        having question marks only. */
2337                                     tc = c;
2338                                 } else {
2339                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2340                                     tc = conv_uni_to_pc(vc, 0xfffd);
2341                                     if (tc < 0) {
2342                                         inverse = 1;
2343                                         tc = conv_uni_to_pc(vc, '?');
2344                                         if (tc < 0) tc = '?';
2345                                     }
2346                                 }
2347                         }
2348
2349                         if (!inverse) {
2350                                 vc_attr = vc->vc_attr;
2351                         } else {
2352                                 /* invert vc_attr */
2353                                 if (!vc->vc_can_do_color) {
2354                                         vc_attr = (vc->vc_attr) ^ 0x08;
2355                                 } else if (vc->vc_hi_font_mask == 0x100) {
2356                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2357                                 } else {
2358                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2359                                 }
2360                                 con_flush(vc, draw_from, draw_to, &draw_x);
2361                         }
2362
2363                         while (1) {
2364                                 if (vc->vc_need_wrap || vc->vc_decim)
2365                                         con_flush(vc, draw_from, draw_to,
2366                                                         &draw_x);
2367                                 if (vc->vc_need_wrap) {
2368                                         cr(vc);
2369                                         lf(vc);
2370                                 }
2371                                 if (vc->vc_decim)
2372                                         insert_char(vc, 1);
2373                                 scr_writew(himask ?
2374                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2375                                              (vc_attr << 8) + tc,
2376                                            (u16 *) vc->vc_pos);
2377                                 if (DO_UPDATE(vc) && draw_x < 0) {
2378                                         draw_x = vc->vc_x;
2379                                         draw_from = vc->vc_pos;
2380                                 }
2381                                 if (vc->vc_x == vc->vc_cols - 1) {
2382                                         vc->vc_need_wrap = vc->vc_decawm;
2383                                         draw_to = vc->vc_pos + 2;
2384                                 } else {
2385                                         vc->vc_x++;
2386                                         draw_to = (vc->vc_pos += 2);
2387                                 }
2388
2389                                 if (!--width) break;
2390
2391                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2392                                 if (tc < 0) tc = ' ';
2393                         }
2394                         notify_write(vc, c);
2395
2396                         if (inverse)
2397                                 con_flush(vc, draw_from, draw_to, &draw_x);
2398
2399                         if (rescan) {
2400                                 rescan = 0;
2401                                 inverse = 0;
2402                                 width = 1;
2403                                 c = orig;
2404                                 goto rescan_last_byte;
2405                         }
2406                         continue;
2407                 }
2408                 con_flush(vc, draw_from, draw_to, &draw_x);
2409                 do_con_trol(tty, vc, orig);
2410         }
2411         con_flush(vc, draw_from, draw_to, &draw_x);
2412         console_conditional_schedule();
2413         console_unlock();
2414         notify_update(vc);
2415         return n;
2416 }
2417
2418 /*
2419  * This is the console switching callback.
2420  *
2421  * Doing console switching in a process context allows
2422  * us to do the switches asynchronously (needed when we want
2423  * to switch due to a keyboard interrupt).  Synchronization
2424  * with other console code and prevention of re-entrancy is
2425  * ensured with console_lock.
2426  */
2427 static void console_callback(struct work_struct *ignored)
2428 {
2429         console_lock();
2430
2431         if (want_console >= 0) {
2432                 if (want_console != fg_console &&
2433                     vc_cons_allocated(want_console)) {
2434                         hide_cursor(vc_cons[fg_console].d);
2435                         change_console(vc_cons[want_console].d);
2436                         /* we only changed when the console had already
2437                            been allocated - a new console is not created
2438                            in an interrupt routine */
2439                 }
2440                 want_console = -1;
2441         }
2442         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2443                 do_poke_blanked_console = 0;
2444                 poke_blanked_console();
2445         }
2446         if (scrollback_delta) {
2447                 struct vc_data *vc = vc_cons[fg_console].d;
2448                 clear_selection();
2449                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2450                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2451                 scrollback_delta = 0;
2452         }
2453         if (blank_timer_expired) {
2454                 do_blank_screen(0);
2455                 blank_timer_expired = 0;
2456         }
2457         notify_update(vc_cons[fg_console].d);
2458
2459         console_unlock();
2460 }
2461
2462 int set_console(int nr)
2463 {
2464         struct vc_data *vc = vc_cons[fg_console].d;
2465
2466         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2467                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2468
2469                 /*
2470                  * Console switch will fail in console_callback() or
2471                  * change_console() so there is no point scheduling
2472                  * the callback
2473                  *
2474                  * Existing set_console() users don't check the return
2475                  * value so this shouldn't break anything
2476                  */
2477                 return -EINVAL;
2478         }
2479
2480         want_console = nr;
2481         schedule_console_callback();
2482
2483         return 0;
2484 }
2485
2486 struct tty_driver *console_driver;
2487
2488 #ifdef CONFIG_VT_CONSOLE
2489
2490 /**
2491  * vt_kmsg_redirect() - Sets/gets the kernel message console
2492  * @new:        The new virtual terminal number or -1 if the console should stay
2493  *              unchanged
2494  *
2495  * By default, the kernel messages are always printed on the current virtual
2496  * console. However, the user may modify that default with the
2497  * TIOCL_SETKMSGREDIRECT ioctl call.
2498  *
2499  * This function sets the kernel message console to be @new. It returns the old
2500  * virtual console number. The virtual terminal number 0 (both as parameter and
2501  * return value) means no redirection (i.e. always printed on the currently
2502  * active console).
2503  *
2504  * The parameter -1 means that only the current console is returned, but the
2505  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2506  * case to make the code more understandable.
2507  *
2508  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2509  * the parameter and always returns 0.
2510  */
2511 int vt_kmsg_redirect(int new)
2512 {
2513         static int kmsg_con;
2514
2515         if (new != -1)
2516                 return xchg(&kmsg_con, new);
2517         else
2518                 return kmsg_con;
2519 }
2520
2521 /*
2522  *      Console on virtual terminal
2523  *
2524  * The console must be locked when we get here.
2525  */
2526
2527 static void vt_console_print(struct console *co, const char *b, unsigned count)
2528 {
2529         struct vc_data *vc = vc_cons[fg_console].d;
2530         unsigned char c;
2531         static DEFINE_SPINLOCK(printing_lock);
2532         const ushort *start;
2533         ushort cnt = 0;
2534         ushort myx;
2535         int kmsg_console;
2536
2537         /* console busy or not yet initialized */
2538         if (!printable)
2539                 return;
2540         if (!spin_trylock(&printing_lock))
2541                 return;
2542
2543         kmsg_console = vt_get_kmsg_redirect();
2544         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2545                 vc = vc_cons[kmsg_console - 1].d;
2546
2547         /* read `x' only after setting currcons properly (otherwise
2548            the `x' macro will read the x of the foreground console). */
2549         myx = vc->vc_x;
2550
2551         if (!vc_cons_allocated(fg_console)) {
2552                 /* impossible */
2553                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2554                 goto quit;
2555         }
2556
2557         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2558                 goto quit;
2559
2560         /* undraw cursor first */
2561         if (IS_FG(vc))
2562                 hide_cursor(vc);
2563
2564         start = (ushort *)vc->vc_pos;
2565
2566         /* Contrived structure to try to emulate original need_wrap behaviour
2567          * Problems caused when we have need_wrap set on '\n' character */
2568         while (count--) {
2569                 c = *b++;
2570                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2571                         if (cnt > 0) {
2572                                 if (CON_IS_VISIBLE(vc))
2573                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2574                                 vc->vc_x += cnt;
2575                                 if (vc->vc_need_wrap)
2576                                         vc->vc_x--;
2577                                 cnt = 0;
2578                         }
2579                         if (c == 8) {           /* backspace */
2580                                 bs(vc);
2581                                 start = (ushort *)vc->vc_pos;
2582                                 myx = vc->vc_x;
2583                                 continue;
2584                         }
2585                         if (c != 13)
2586                                 lf(vc);
2587                         cr(vc);
2588                         start = (ushort *)vc->vc_pos;
2589                         myx = vc->vc_x;
2590                         if (c == 10 || c == 13)
2591                                 continue;
2592                 }
2593                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2594                 notify_write(vc, c);
2595                 cnt++;
2596                 if (myx == vc->vc_cols - 1) {
2597                         vc->vc_need_wrap = 1;
2598                         continue;
2599                 }
2600                 vc->vc_pos += 2;
2601                 myx++;
2602         }
2603         if (cnt > 0) {
2604                 if (CON_IS_VISIBLE(vc))
2605                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2606                 vc->vc_x += cnt;
2607                 if (vc->vc_x == vc->vc_cols) {
2608                         vc->vc_x--;
2609                         vc->vc_need_wrap = 1;
2610                 }
2611         }
2612         set_cursor(vc);
2613         notify_update(vc);
2614
2615 quit:
2616         spin_unlock(&printing_lock);
2617 }
2618
2619 static struct tty_driver *vt_console_device(struct console *c, int *index)
2620 {
2621         *index = c->index ? c->index-1 : fg_console;
2622         return console_driver;
2623 }
2624
2625 static struct console vt_console_driver = {
2626         .name           = "tty",
2627         .write          = vt_console_print,
2628         .device         = vt_console_device,
2629         .unblank        = unblank_screen,
2630         .flags          = CON_PRINTBUFFER,
2631         .index          = -1,
2632 };
2633 #endif
2634
2635 /*
2636  *      Handling of Linux-specific VC ioctls
2637  */
2638
2639 /*
2640  * Generally a bit racy with respect to console_lock();.
2641  *
2642  * There are some functions which don't need it.
2643  *
2644  * There are some functions which can sleep for arbitrary periods
2645  * (paste_selection) but we don't need the lock there anyway.
2646  *
2647  * set_selection has locking, and definitely needs it
2648  */
2649
2650 int tioclinux(struct tty_struct *tty, unsigned long arg)
2651 {
2652         char type, data;
2653         char __user *p = (char __user *)arg;
2654         int lines;
2655         int ret;
2656
2657         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2658                 return -EPERM;
2659         if (get_user(type, p))
2660                 return -EFAULT;
2661         ret = 0;
2662
2663         switch (type)
2664         {
2665                 case TIOCL_SETSEL:
2666                         console_lock();
2667                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2668                         console_unlock();
2669                         break;
2670                 case TIOCL_PASTESEL:
2671                         ret = paste_selection(tty);
2672                         break;
2673                 case TIOCL_UNBLANKSCREEN:
2674                         console_lock();
2675                         unblank_screen();
2676                         console_unlock();
2677                         break;
2678                 case TIOCL_SELLOADLUT:
2679                         console_lock();
2680                         ret = sel_loadlut(p);
2681                         console_unlock();
2682                         break;
2683                 case TIOCL_GETSHIFTSTATE:
2684
2685         /*
2686          * Make it possible to react to Shift+Mousebutton.
2687          * Note that 'shift_state' is an undocumented
2688          * kernel-internal variable; programs not closely
2689          * related to the kernel should not use this.
2690          */
2691                         data = vt_get_shift_state();
2692                         ret = __put_user(data, p);
2693                         break;
2694                 case TIOCL_GETMOUSEREPORTING:
2695                         console_lock(); /* May be overkill */
2696                         data = mouse_reporting();
2697                         console_unlock();
2698                         ret = __put_user(data, p);
2699                         break;
2700                 case TIOCL_SETVESABLANK:
2701                         console_lock();
2702                         ret = set_vesa_blanking(p);
2703                         console_unlock();
2704                         break;
2705                 case TIOCL_GETKMSGREDIRECT:
2706                         data = vt_get_kmsg_redirect();
2707                         ret = __put_user(data, p);
2708                         break;
2709                 case TIOCL_SETKMSGREDIRECT:
2710                         if (!capable(CAP_SYS_ADMIN)) {
2711                                 ret = -EPERM;
2712                         } else {
2713                                 if (get_user(data, p+1))
2714                                         ret = -EFAULT;
2715                                 else
2716                                         vt_kmsg_redirect(data);
2717                         }
2718                         break;
2719                 case TIOCL_GETFGCONSOLE:
2720                         /* No locking needed as this is a transiently
2721                            correct return anyway if the caller hasn't
2722                            disabled switching */
2723                         ret = fg_console;
2724                         break;
2725                 case TIOCL_SCROLLCONSOLE:
2726                         if (get_user(lines, (s32 __user *)(p+4))) {
2727                                 ret = -EFAULT;
2728                         } else {
2729                                 /* Need the console lock here. Note that lots
2730                                    of other calls need fixing before the lock
2731                                    is actually useful ! */
2732                                 console_lock();
2733                                 scrollfront(vc_cons[fg_console].d, lines);
2734                                 console_unlock();
2735                                 ret = 0;
2736                         }
2737                         break;
2738                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2739                         console_lock();
2740                         ignore_poke = 1;
2741                         do_blank_screen(0);
2742                         console_unlock();
2743                         break;
2744                 case TIOCL_BLANKEDSCREEN:
2745                         ret = console_blanked;
2746                         break;
2747                 default:
2748                         ret = -EINVAL;
2749                         break;
2750         }
2751         return ret;
2752 }
2753
2754 /*
2755  * /dev/ttyN handling
2756  */
2757
2758 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2759 {
2760         int     retval;
2761
2762         retval = do_con_write(tty, buf, count);
2763         con_flush_chars(tty);
2764
2765         return retval;
2766 }
2767
2768 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2769 {
2770         if (in_interrupt())
2771                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2772         return do_con_write(tty, &ch, 1);
2773 }
2774
2775 static int con_write_room(struct tty_struct *tty)
2776 {
2777         if (tty->stopped)
2778                 return 0;
2779         return 32768;           /* No limit, really; we're not buffering */
2780 }
2781
2782 static int con_chars_in_buffer(struct tty_struct *tty)
2783 {
2784         return 0;               /* we're not buffering */
2785 }
2786
2787 /*
2788  * con_throttle and con_unthrottle are only used for
2789  * paste_selection(), which has to stuff in a large number of
2790  * characters...
2791  */
2792 static void con_throttle(struct tty_struct *tty)
2793 {
2794 }
2795
2796 static void con_unthrottle(struct tty_struct *tty)
2797 {
2798         struct vc_data *vc = tty->driver_data;
2799
2800         wake_up_interruptible(&vc->paste_wait);
2801 }
2802
2803 /*
2804  * Turn the Scroll-Lock LED on when the tty is stopped
2805  */
2806 static void con_stop(struct tty_struct *tty)
2807 {
2808         int console_num;
2809         if (!tty)
2810                 return;
2811         console_num = tty->index;
2812         if (!vc_cons_allocated(console_num))
2813                 return;
2814         vt_kbd_con_stop(console_num);
2815 }
2816
2817 /*
2818  * Turn the Scroll-Lock LED off when the console is started
2819  */
2820 static void con_start(struct tty_struct *tty)
2821 {
2822         int console_num;
2823         if (!tty)
2824                 return;
2825         console_num = tty->index;
2826         if (!vc_cons_allocated(console_num))
2827                 return;
2828         vt_kbd_con_start(console_num);
2829 }
2830
2831 static void con_flush_chars(struct tty_struct *tty)
2832 {
2833         struct vc_data *vc;
2834
2835         if (in_interrupt())     /* from flush_to_ldisc */
2836                 return;
2837
2838         /* if we race with con_close(), vt may be null */
2839         console_lock();
2840         vc = tty->driver_data;
2841         if (vc)
2842                 set_cursor(vc);
2843         console_unlock();
2844 }
2845
2846 /*
2847  * Allocate the console screen memory.
2848  */
2849 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2850 {
2851         unsigned int currcons = tty->index;
2852         struct vc_data *vc;
2853         int ret;
2854
2855         console_lock();
2856         ret = vc_allocate(currcons);
2857         if (ret)
2858                 goto unlock;
2859
2860         vc = vc_cons[currcons].d;
2861
2862         /* Still being freed */
2863         if (vc->port.tty) {
2864                 ret = -ERESTARTSYS;
2865                 goto unlock;
2866         }
2867
2868         ret = tty_port_install(&vc->port, driver, tty);
2869         if (ret)
2870                 goto unlock;
2871
2872         tty->driver_data = vc;
2873         vc->port.tty = tty;
2874
2875         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2876                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2877                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2878         }
2879         if (vc->vc_utf)
2880                 tty->termios.c_iflag |= IUTF8;
2881         else
2882                 tty->termios.c_iflag &= ~IUTF8;
2883 unlock:
2884         console_unlock();
2885         return ret;
2886 }
2887
2888 static int con_open(struct tty_struct *tty, struct file *filp)
2889 {
2890         /* everything done in install */
2891         return 0;
2892 }
2893
2894
2895 static void con_close(struct tty_struct *tty, struct file *filp)
2896 {
2897         /* Nothing to do - we defer to shutdown */
2898 }
2899
2900 static void con_shutdown(struct tty_struct *tty)
2901 {
2902         struct vc_data *vc = tty->driver_data;
2903         BUG_ON(vc == NULL);
2904         console_lock();
2905         vc->port.tty = NULL;
2906         console_unlock();
2907 }
2908
2909 static int default_color           = 7; /* white */
2910 static int default_italic_color    = 2; // green (ASCII)
2911 static int default_underline_color = 3; // cyan (ASCII)
2912 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2913 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2914 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2915
2916 static void vc_init(struct vc_data *vc, unsigned int rows,
2917                     unsigned int cols, int do_clear)
2918 {
2919         int j, k ;
2920
2921         vc->vc_cols = cols;
2922         vc->vc_rows = rows;
2923         vc->vc_size_row = cols << 1;
2924         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2925
2926         set_origin(vc);
2927         vc->vc_pos = vc->vc_origin;
2928         reset_vc(vc);
2929         for (j=k=0; j<16; j++) {
2930                 vc->vc_palette[k++] = default_red[j] ;
2931                 vc->vc_palette[k++] = default_grn[j] ;
2932                 vc->vc_palette[k++] = default_blu[j] ;
2933         }
2934         vc->vc_def_color       = default_color;
2935         vc->vc_ulcolor         = default_underline_color;
2936         vc->vc_itcolor         = default_italic_color;
2937         vc->vc_halfcolor       = 0x08;   /* grey */
2938         init_waitqueue_head(&vc->paste_wait);
2939         reset_terminal(vc, do_clear);
2940 }
2941
2942 /*
2943  * This routine initializes console interrupts, and does nothing
2944  * else. If you want the screen to clear, call tty_write with
2945  * the appropriate escape-sequence.
2946  */
2947
2948 static int __init con_init(void)
2949 {
2950         const char *display_desc = NULL;
2951         struct vc_data *vc;
2952         unsigned int currcons = 0, i;
2953
2954         console_lock();
2955
2956         if (conswitchp)
2957                 display_desc = conswitchp->con_startup();
2958         if (!display_desc) {
2959                 fg_console = 0;
2960                 console_unlock();
2961                 return 0;
2962         }
2963
2964         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2965                 struct con_driver *con_driver = &registered_con_driver[i];
2966
2967                 if (con_driver->con == NULL) {
2968                         con_driver->con = conswitchp;
2969                         con_driver->desc = display_desc;
2970                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2971                         con_driver->first = 0;
2972                         con_driver->last = MAX_NR_CONSOLES - 1;
2973                         break;
2974                 }
2975         }
2976
2977         for (i = 0; i < MAX_NR_CONSOLES; i++)
2978                 con_driver_map[i] = conswitchp;
2979
2980         if (blankinterval) {
2981                 blank_state = blank_normal_wait;
2982                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2983         }
2984
2985         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2986                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2987                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2988                 tty_port_init(&vc->port);
2989                 visual_init(vc, currcons, 1);
2990                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2991                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2992                         currcons || !vc->vc_sw->con_save_screen);
2993         }
2994         currcons = fg_console = 0;
2995         master_display_fg = vc = vc_cons[currcons].d;
2996         set_origin(vc);
2997         save_screen(vc);
2998         gotoxy(vc, vc->vc_x, vc->vc_y);
2999         csi_J(vc, 0);
3000         update_screen(vc);
3001         pr_info("Console: %s %s %dx%d\n",
3002                 vc->vc_can_do_color ? "colour" : "mono",
3003                 display_desc, vc->vc_cols, vc->vc_rows);
3004         printable = 1;
3005
3006         console_unlock();
3007
3008 #ifdef CONFIG_VT_CONSOLE
3009         register_console(&vt_console_driver);
3010 #endif
3011         return 0;
3012 }
3013 console_initcall(con_init);
3014
3015 static const struct tty_operations con_ops = {
3016         .install = con_install,
3017         .open = con_open,
3018         .close = con_close,
3019         .write = con_write,
3020         .write_room = con_write_room,
3021         .put_char = con_put_char,
3022         .flush_chars = con_flush_chars,
3023         .chars_in_buffer = con_chars_in_buffer,
3024         .ioctl = vt_ioctl,
3025 #ifdef CONFIG_COMPAT
3026         .compat_ioctl = vt_compat_ioctl,
3027 #endif
3028         .stop = con_stop,
3029         .start = con_start,
3030         .throttle = con_throttle,
3031         .unthrottle = con_unthrottle,
3032         .resize = vt_resize,
3033         .shutdown = con_shutdown
3034 };
3035
3036 static struct cdev vc0_cdev;
3037
3038 static ssize_t show_tty_active(struct device *dev,
3039                                 struct device_attribute *attr, char *buf)
3040 {
3041         return sprintf(buf, "tty%d\n", fg_console + 1);
3042 }
3043 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3044
3045 static struct attribute *vt_dev_attrs[] = {
3046         &dev_attr_active.attr,
3047         NULL
3048 };
3049
3050 ATTRIBUTE_GROUPS(vt_dev);
3051
3052 int __init vty_init(const struct file_operations *console_fops)
3053 {
3054         cdev_init(&vc0_cdev, console_fops);
3055         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3056             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3057                 panic("Couldn't register /dev/tty0 driver\n");
3058         tty0dev = device_create_with_groups(tty_class, NULL,
3059                                             MKDEV(TTY_MAJOR, 0), NULL,
3060                                             vt_dev_groups, "tty0");
3061         if (IS_ERR(tty0dev))
3062                 tty0dev = NULL;
3063
3064         vcs_init();
3065
3066         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3067         if (!console_driver)
3068                 panic("Couldn't allocate console driver\n");
3069
3070         console_driver->name = "tty";
3071         console_driver->name_base = 1;
3072         console_driver->major = TTY_MAJOR;
3073         console_driver->minor_start = 1;
3074         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3075         console_driver->init_termios = tty_std_termios;
3076         if (default_utf8)
3077                 console_driver->init_termios.c_iflag |= IUTF8;
3078         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3079         tty_set_operations(console_driver, &con_ops);
3080         if (tty_register_driver(console_driver))
3081                 panic("Couldn't register console driver\n");
3082         kbd_init();
3083         console_map_init();
3084 #ifdef CONFIG_MDA_CONSOLE
3085         mda_console_init();
3086 #endif
3087         return 0;
3088 }
3089
3090 #ifndef VT_SINGLE_DRIVER
3091
3092 static struct class *vtconsole_class;
3093
3094 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3095                            int deflt)
3096 {
3097         struct module *owner = csw->owner;
3098         const char *desc = NULL;
3099         struct con_driver *con_driver;
3100         int i, j = -1, k = -1, retval = -ENODEV;
3101
3102         if (!try_module_get(owner))
3103                 return -ENODEV;
3104
3105         WARN_CONSOLE_UNLOCKED();
3106
3107         /* check if driver is registered */
3108         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3109                 con_driver = &registered_con_driver[i];
3110
3111                 if (con_driver->con == csw) {
3112                         desc = con_driver->desc;
3113                         retval = 0;
3114                         break;
3115                 }
3116         }
3117
3118         if (retval)
3119                 goto err;
3120
3121         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3122                 csw->con_startup();
3123                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3124         }
3125
3126         if (deflt) {
3127                 if (conswitchp)
3128                         module_put(conswitchp->owner);
3129
3130                 __module_get(owner);
3131                 conswitchp = csw;
3132         }
3133
3134         first = max(first, con_driver->first);
3135         last = min(last, con_driver->last);
3136
3137         for (i = first; i <= last; i++) {
3138                 int old_was_color;
3139                 struct vc_data *vc = vc_cons[i].d;
3140
3141                 if (con_driver_map[i])
3142                         module_put(con_driver_map[i]->owner);
3143                 __module_get(owner);
3144                 con_driver_map[i] = csw;
3145
3146                 if (!vc || !vc->vc_sw)
3147                         continue;
3148
3149                 j = i;
3150
3151                 if (CON_IS_VISIBLE(vc)) {
3152                         k = i;
3153                         save_screen(vc);
3154                 }
3155
3156                 old_was_color = vc->vc_can_do_color;
3157                 vc->vc_sw->con_deinit(vc);
3158                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3159                 visual_init(vc, i, 0);
3160                 set_origin(vc);
3161                 update_attr(vc);
3162
3163                 /* If the console changed between mono <-> color, then
3164                  * the attributes in the screenbuf will be wrong.  The
3165                  * following resets all attributes to something sane.
3166                  */
3167                 if (old_was_color != vc->vc_can_do_color)
3168                         clear_buffer_attributes(vc);
3169         }
3170
3171         pr_info("Console: switching ");
3172         if (!deflt)
3173                 printk("consoles %d-%d ", first+1, last+1);
3174         if (j >= 0) {
3175                 struct vc_data *vc = vc_cons[j].d;
3176
3177                 printk("to %s %s %dx%d\n",
3178                        vc->vc_can_do_color ? "colour" : "mono",
3179                        desc, vc->vc_cols, vc->vc_rows);
3180
3181                 if (k >= 0) {
3182                         vc = vc_cons[k].d;
3183                         update_screen(vc);
3184                 }
3185         } else
3186                 printk("to %s\n", desc);
3187
3188         retval = 0;
3189 err:
3190         module_put(owner);
3191         return retval;
3192 };
3193
3194
3195 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3196 /* unlocked version of unbind_con_driver() */
3197 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3198 {
3199         struct module *owner = csw->owner;
3200         const struct consw *defcsw = NULL;
3201         struct con_driver *con_driver = NULL, *con_back = NULL;
3202         int i, retval = -ENODEV;
3203
3204         if (!try_module_get(owner))
3205                 return -ENODEV;
3206
3207         WARN_CONSOLE_UNLOCKED();
3208
3209         /* check if driver is registered and if it is unbindable */
3210         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3211                 con_driver = &registered_con_driver[i];
3212
3213                 if (con_driver->con == csw &&
3214                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3215                         retval = 0;
3216                         break;
3217                 }
3218         }
3219
3220         if (retval)
3221                 goto err;
3222
3223         retval = -ENODEV;
3224
3225         /* check if backup driver exists */
3226         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3227                 con_back = &registered_con_driver[i];
3228
3229                 if (con_back->con && con_back->con != csw) {
3230                         defcsw = con_back->con;
3231                         retval = 0;
3232                         break;
3233                 }
3234         }
3235
3236         if (retval)
3237                 goto err;
3238
3239         if (!con_is_bound(csw))
3240                 goto err;
3241
3242         first = max(first, con_driver->first);
3243         last = min(last, con_driver->last);
3244
3245         for (i = first; i <= last; i++) {
3246                 if (con_driver_map[i] == csw) {
3247                         module_put(csw->owner);
3248                         con_driver_map[i] = NULL;
3249                 }
3250         }
3251
3252         if (!con_is_bound(defcsw)) {
3253                 const struct consw *defconsw = conswitchp;
3254
3255                 defcsw->con_startup();
3256                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3257                 /*
3258                  * vgacon may change the default driver to point
3259                  * to dummycon, we restore it here...
3260                  */
3261                 conswitchp = defconsw;
3262         }
3263
3264         if (!con_is_bound(csw))
3265                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3266
3267         /* ignore return value, binding should not fail */
3268         do_bind_con_driver(defcsw, first, last, deflt);
3269 err:
3270         module_put(owner);
3271         return retval;
3272
3273 }
3274 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3275
3276 static int vt_bind(struct con_driver *con)
3277 {
3278         const struct consw *defcsw = NULL, *csw = NULL;
3279         int i, more = 1, first = -1, last = -1, deflt = 0;
3280
3281         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3282                 goto err;
3283
3284         csw = con->con;
3285
3286         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3287                 struct con_driver *con = &registered_con_driver[i];
3288
3289                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3290                         defcsw = con->con;
3291                         break;
3292                 }
3293         }
3294
3295         if (!defcsw)
3296                 goto err;
3297
3298         while (more) {
3299                 more = 0;
3300
3301                 for (i = con->first; i <= con->last; i++) {
3302                         if (con_driver_map[i] == defcsw) {
3303                                 if (first == -1)
3304                                         first = i;
3305                                 last = i;
3306                                 more = 1;
3307                         } else if (first != -1)
3308                                 break;
3309                 }
3310
3311                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3312                         deflt = 1;
3313
3314                 if (first != -1)
3315                         do_bind_con_driver(csw, first, last, deflt);
3316
3317                 first = -1;
3318                 last = -1;
3319                 deflt = 0;
3320         }
3321
3322 err:
3323         return 0;
3324 }
3325
3326 static int vt_unbind(struct con_driver *con)
3327 {
3328         const struct consw *csw = NULL;
3329         int i, more = 1, first = -1, last = -1, deflt = 0;
3330         int ret;
3331
3332         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3333                 goto err;
3334
3335         csw = con->con;
3336
3337         while (more) {
3338                 more = 0;
3339
3340                 for (i = con->first; i <= con->last; i++) {
3341                         if (con_driver_map[i] == csw) {
3342                                 if (first == -1)
3343                                         first = i;
3344                                 last = i;
3345                                 more = 1;
3346                         } else if (first != -1)
3347                                 break;
3348                 }
3349
3350                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3351                         deflt = 1;
3352
3353                 if (first != -1) {
3354                         ret = do_unbind_con_driver(csw, first, last, deflt);
3355                         if (ret != 0)
3356                                 return ret;
3357                 }
3358
3359                 first = -1;
3360                 last = -1;
3361                 deflt = 0;
3362         }
3363
3364 err:
3365         return 0;
3366 }
3367 #else
3368 static inline int vt_bind(struct con_driver *con)
3369 {
3370         return 0;
3371 }
3372 static inline int vt_unbind(struct con_driver *con)
3373 {
3374         return 0;
3375 }
3376 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3377
3378 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3379                           const char *buf, size_t count)
3380 {
3381         struct con_driver *con = dev_get_drvdata(dev);
3382         int bind = simple_strtoul(buf, NULL, 0);
3383
3384         console_lock();
3385
3386         if (bind)
3387                 vt_bind(con);
3388         else
3389                 vt_unbind(con);
3390
3391         console_unlock();
3392
3393         return count;
3394 }
3395
3396 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3397                          char *buf)
3398 {
3399         struct con_driver *con = dev_get_drvdata(dev);
3400         int bind = con_is_bound(con->con);
3401
3402         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3403 }
3404
3405 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3406                          char *buf)
3407 {
3408         struct con_driver *con = dev_get_drvdata(dev);
3409
3410         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3411                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3412                          con->desc);
3413
3414 }
3415
3416 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3417 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3418
3419 static struct attribute *con_dev_attrs[] = {
3420         &dev_attr_bind.attr,
3421         &dev_attr_name.attr,
3422         NULL
3423 };
3424
3425 ATTRIBUTE_GROUPS(con_dev);
3426
3427 static int vtconsole_init_device(struct con_driver *con)
3428 {
3429         con->flag |= CON_DRIVER_FLAG_ATTR;
3430         return 0;
3431 }
3432
3433 static void vtconsole_deinit_device(struct con_driver *con)
3434 {
3435         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3436 }
3437
3438 /**
3439  * con_is_bound - checks if driver is bound to the console
3440  * @csw: console driver
3441  *
3442  * RETURNS: zero if unbound, nonzero if bound
3443  *
3444  * Drivers can call this and if zero, they should release
3445  * all resources allocated on con_startup()
3446  */
3447 int con_is_bound(const struct consw *csw)
3448 {
3449         int i, bound = 0;
3450
3451         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3452                 if (con_driver_map[i] == csw) {
3453                         bound = 1;
3454                         break;
3455                 }
3456         }
3457
3458         return bound;
3459 }
3460 EXPORT_SYMBOL(con_is_bound);
3461
3462 /**
3463  * con_debug_enter - prepare the console for the kernel debugger
3464  * @sw: console driver
3465  *
3466  * Called when the console is taken over by the kernel debugger, this
3467  * function needs to save the current console state, then put the console
3468  * into a state suitable for the kernel debugger.
3469  *
3470  * RETURNS:
3471  * Zero on success, nonzero if a failure occurred when trying to prepare
3472  * the console for the debugger.
3473  */
3474 int con_debug_enter(struct vc_data *vc)
3475 {
3476         int ret = 0;
3477
3478         saved_fg_console = fg_console;
3479         saved_last_console = last_console;
3480         saved_want_console = want_console;
3481         saved_vc_mode = vc->vc_mode;
3482         saved_console_blanked = console_blanked;
3483         vc->vc_mode = KD_TEXT;
3484         console_blanked = 0;
3485         if (vc->vc_sw->con_debug_enter)
3486                 ret = vc->vc_sw->con_debug_enter(vc);
3487 #ifdef CONFIG_KGDB_KDB
3488         /* Set the initial LINES variable if it is not already set */
3489         if (vc->vc_rows < 999) {
3490                 int linecount;
3491                 char lns[4];
3492                 const char *setargs[3] = {
3493                         "set",
3494                         "LINES",
3495                         lns,
3496                 };
3497                 if (kdbgetintenv(setargs[0], &linecount)) {
3498                         snprintf(lns, 4, "%i", vc->vc_rows);
3499                         kdb_set(2, setargs);
3500                 }
3501         }
3502         if (vc->vc_cols < 999) {
3503                 int colcount;
3504                 char cols[4];
3505                 const char *setargs[3] = {
3506                         "set",
3507                         "COLUMNS",
3508                         cols,
3509                 };
3510                 if (kdbgetintenv(setargs[0], &colcount)) {
3511                         snprintf(cols, 4, "%i", vc->vc_cols);
3512                         kdb_set(2, setargs);
3513                 }
3514         }
3515 #endif /* CONFIG_KGDB_KDB */
3516         return ret;
3517 }
3518 EXPORT_SYMBOL_GPL(con_debug_enter);
3519
3520 /**
3521  * con_debug_leave - restore console state
3522  * @sw: console driver
3523  *
3524  * Restore the console state to what it was before the kernel debugger
3525  * was invoked.
3526  *
3527  * RETURNS:
3528  * Zero on success, nonzero if a failure occurred when trying to restore
3529  * the console.
3530  */
3531 int con_debug_leave(void)
3532 {
3533         struct vc_data *vc;
3534         int ret = 0;
3535
3536         fg_console = saved_fg_console;
3537         last_console = saved_last_console;
3538         want_console = saved_want_console;
3539         console_blanked = saved_console_blanked;
3540         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3541
3542         vc = vc_cons[fg_console].d;
3543         if (vc->vc_sw->con_debug_leave)
3544                 ret = vc->vc_sw->con_debug_leave(vc);
3545         return ret;
3546 }
3547 EXPORT_SYMBOL_GPL(con_debug_leave);
3548
3549 static int do_register_con_driver(const struct consw *csw, int first, int last)
3550 {
3551         struct module *owner = csw->owner;
3552         struct con_driver *con_driver;
3553         const char *desc;
3554         int i, retval;
3555
3556         WARN_CONSOLE_UNLOCKED();
3557
3558         if (!try_module_get(owner))
3559                 return -ENODEV;
3560
3561         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3562                 con_driver = &registered_con_driver[i];
3563
3564                 /* already registered */
3565                 if (con_driver->con == csw) {
3566                         retval = -EBUSY;
3567                         goto err;
3568                 }
3569         }
3570
3571         desc = csw->con_startup();
3572         if (!desc) {
3573                 retval = -ENODEV;
3574                 goto err;
3575         }
3576
3577         retval = -EINVAL;
3578
3579         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3580                 con_driver = &registered_con_driver[i];
3581
3582                 if (con_driver->con == NULL &&
3583                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3584                         con_driver->con = csw;
3585                         con_driver->desc = desc;
3586                         con_driver->node = i;
3587                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3588                                            CON_DRIVER_FLAG_INIT;
3589                         con_driver->first = first;
3590                         con_driver->last = last;
3591                         retval = 0;
3592                         break;
3593                 }
3594         }
3595
3596         if (retval)
3597                 goto err;
3598
3599         con_driver->dev =
3600                 device_create_with_groups(vtconsole_class, NULL,
3601                                           MKDEV(0, con_driver->node),
3602                                           con_driver, con_dev_groups,
3603                                           "vtcon%i", con_driver->node);
3604         if (IS_ERR(con_driver->dev)) {
3605                 printk(KERN_WARNING "Unable to create device for %s; "
3606                        "errno = %ld\n", con_driver->desc,
3607                        PTR_ERR(con_driver->dev));
3608                 con_driver->dev = NULL;
3609         } else {
3610                 vtconsole_init_device(con_driver);
3611         }
3612
3613 err:
3614         module_put(owner);
3615         return retval;
3616 }
3617
3618
3619 /**
3620  * do_unregister_con_driver - unregister console driver from console layer
3621  * @csw: console driver
3622  *
3623  * DESCRIPTION: All drivers that registers to the console layer must
3624  * call this function upon exit, or if the console driver is in a state
3625  * where it won't be able to handle console services, such as the
3626  * framebuffer console without loaded framebuffer drivers.
3627  *
3628  * The driver must unbind first prior to unregistration.
3629  */
3630 int do_unregister_con_driver(const struct consw *csw)
3631 {
3632         int i;
3633
3634         /* cannot unregister a bound driver */
3635         if (con_is_bound(csw))
3636                 return -EBUSY;
3637
3638         if (csw == conswitchp)
3639                 return -EINVAL;
3640
3641         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3642                 struct con_driver *con_driver = &registered_con_driver[i];
3643
3644                 if (con_driver->con == csw) {
3645                         /*
3646                          * Defer the removal of the sysfs entries since that
3647                          * will acquire the kernfs s_active lock and we can't
3648                          * acquire this lock while holding the console lock:
3649                          * the unbind sysfs entry imposes already the opposite
3650                          * order. Reset con already here to prevent any later
3651                          * lookup to succeed and mark this slot as zombie, so
3652                          * it won't get reused until we complete the removal
3653                          * in the deferred work.
3654                          */
3655                         con_driver->con = NULL;
3656                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3657                         schedule_work(&con_driver_unregister_work);
3658
3659                         return 0;
3660                 }
3661         }
3662
3663         return -ENODEV;
3664 }
3665 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3666
3667 static void con_driver_unregister_callback(struct work_struct *ignored)
3668 {
3669         int i;
3670
3671         console_lock();
3672
3673         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3674                 struct con_driver *con_driver = &registered_con_driver[i];
3675
3676                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3677                         continue;
3678
3679                 console_unlock();
3680
3681                 vtconsole_deinit_device(con_driver);
3682                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3683
3684                 console_lock();
3685
3686                 if (WARN_ON_ONCE(con_driver->con))
3687                         con_driver->con = NULL;
3688                 con_driver->desc = NULL;
3689                 con_driver->dev = NULL;
3690                 con_driver->node = 0;
3691                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3692                 con_driver->flag = 0;
3693                 con_driver->first = 0;
3694                 con_driver->last = 0;
3695         }
3696
3697         console_unlock();
3698 }
3699
3700 /*
3701  *      If we support more console drivers, this function is used
3702  *      when a driver wants to take over some existing consoles
3703  *      and become default driver for newly opened ones.
3704  *
3705  *      do_take_over_console is basically a register followed by unbind
3706  */
3707 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3708 {
3709         int err;
3710
3711         err = do_register_con_driver(csw, first, last);
3712         /*
3713          * If we get an busy error we still want to bind the console driver
3714          * and return success, as we may have unbound the console driver
3715          * but not unregistered it.
3716          */
3717         if (err == -EBUSY)
3718                 err = 0;
3719         if (!err)
3720                 do_bind_con_driver(csw, first, last, deflt);
3721
3722         return err;
3723 }
3724 EXPORT_SYMBOL_GPL(do_take_over_console);
3725
3726
3727 /*
3728  * give_up_console is a wrapper to unregister_con_driver. It will only
3729  * work if driver is fully unbound.
3730  */
3731 void give_up_console(const struct consw *csw)
3732 {
3733         console_lock();
3734         do_unregister_con_driver(csw);
3735         console_unlock();
3736 }
3737
3738 static int __init vtconsole_class_init(void)
3739 {
3740         int i;
3741
3742         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3743         if (IS_ERR(vtconsole_class)) {
3744                 printk(KERN_WARNING "Unable to create vt console class; "
3745                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3746                 vtconsole_class = NULL;
3747         }
3748
3749         /* Add system drivers to sysfs */
3750         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3751                 struct con_driver *con = &registered_con_driver[i];
3752
3753                 if (con->con && !con->dev) {
3754                         con->dev =
3755                                 device_create_with_groups(vtconsole_class, NULL,
3756                                                           MKDEV(0, con->node),
3757                                                           con, con_dev_groups,
3758                                                           "vtcon%i", con->node);
3759
3760                         if (IS_ERR(con->dev)) {
3761                                 printk(KERN_WARNING "Unable to create "
3762                                        "device for %s; errno = %ld\n",
3763                                        con->desc, PTR_ERR(con->dev));
3764                                 con->dev = NULL;
3765                         } else {
3766                                 vtconsole_init_device(con);
3767                         }
3768                 }
3769         }
3770
3771         return 0;
3772 }
3773 postcore_initcall(vtconsole_class_init);
3774
3775 #endif
3776
3777 /*
3778  *      Screen blanking
3779  */
3780
3781 static int set_vesa_blanking(char __user *p)
3782 {
3783         unsigned int mode;
3784
3785         if (get_user(mode, p + 1))
3786                 return -EFAULT;
3787
3788         vesa_blank_mode = (mode < 4) ? mode : 0;
3789         return 0;
3790 }
3791
3792 void do_blank_screen(int entering_gfx)
3793 {
3794         struct vc_data *vc = vc_cons[fg_console].d;
3795         int i;
3796
3797         WARN_CONSOLE_UNLOCKED();
3798
3799         if (console_blanked) {
3800                 if (blank_state == blank_vesa_wait) {
3801                         blank_state = blank_off;
3802                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3803                 }
3804                 return;
3805         }
3806
3807         /* entering graphics mode? */
3808         if (entering_gfx) {
3809                 hide_cursor(vc);
3810                 save_screen(vc);
3811                 vc->vc_sw->con_blank(vc, -1, 1);
3812                 console_blanked = fg_console + 1;
3813                 blank_state = blank_off;
3814                 set_origin(vc);
3815                 return;
3816         }
3817
3818         if (blank_state != blank_normal_wait)
3819                 return;
3820         blank_state = blank_off;
3821
3822         /* don't blank graphics */
3823         if (vc->vc_mode != KD_TEXT) {
3824                 console_blanked = fg_console + 1;
3825                 return;
3826         }
3827
3828         hide_cursor(vc);
3829         del_timer_sync(&console_timer);
3830         blank_timer_expired = 0;
3831
3832         save_screen(vc);
3833         /* In case we need to reset origin, blanking hook returns 1 */
3834         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3835         console_blanked = fg_console + 1;
3836         if (i)
3837                 set_origin(vc);
3838
3839         if (console_blank_hook && console_blank_hook(1))
3840                 return;
3841
3842         if (vesa_off_interval && vesa_blank_mode) {
3843                 blank_state = blank_vesa_wait;
3844                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3845         }
3846         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3847 }
3848 EXPORT_SYMBOL(do_blank_screen);
3849
3850 /*
3851  * Called by timer as well as from vt_console_driver
3852  */
3853 void do_unblank_screen(int leaving_gfx)
3854 {
3855         struct vc_data *vc;
3856
3857         /* This should now always be called from a "sane" (read: can schedule)
3858          * context for the sake of the low level drivers, except in the special
3859          * case of oops_in_progress
3860          */
3861         if (!oops_in_progress)
3862                 might_sleep();
3863
3864         WARN_CONSOLE_UNLOCKED();
3865
3866         ignore_poke = 0;
3867         if (!console_blanked)
3868                 return;
3869         if (!vc_cons_allocated(fg_console)) {
3870                 /* impossible */
3871                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3872                         fg_console + 1);
3873                 return;
3874         }
3875         vc = vc_cons[fg_console].d;
3876         /* Try to unblank in oops case too */
3877         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3878                 return; /* but leave console_blanked != 0 */
3879
3880         if (blankinterval) {
3881                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3882                 blank_state = blank_normal_wait;
3883         }
3884
3885         console_blanked = 0;
3886         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3887                 /* Low-level driver cannot restore -> do it ourselves */
3888                 update_screen(vc);
3889         if (console_blank_hook)
3890                 console_blank_hook(0);
3891         set_palette(vc);
3892         set_cursor(vc);
3893         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3894 }
3895 EXPORT_SYMBOL(do_unblank_screen);
3896
3897 /*
3898  * This is called by the outside world to cause a forced unblank, mostly for
3899  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3900  * call it with 1 as an argument and so force a mode restore... that may kill
3901  * X or at least garbage the screen but would also make the Oops visible...
3902  */
3903 void unblank_screen(void)
3904 {
3905         do_unblank_screen(0);
3906 }
3907
3908 /*
3909  * We defer the timer blanking to work queue so it can take the console mutex
3910  * (console operations can still happen at irq time, but only from printk which
3911  * has the console mutex. Not perfect yet, but better than no locking
3912  */
3913 static void blank_screen_t(unsigned long dummy)
3914 {
3915         if (unlikely(!keventd_up())) {
3916                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3917                 return;
3918         }
3919         blank_timer_expired = 1;
3920         schedule_work(&console_work);
3921 }
3922
3923 void poke_blanked_console(void)
3924 {
3925         WARN_CONSOLE_UNLOCKED();
3926
3927         /* Add this so we quickly catch whoever might call us in a non
3928          * safe context. Nowadays, unblank_screen() isn't to be called in
3929          * atomic contexts and is allowed to schedule (with the special case
3930          * of oops_in_progress, but that isn't of any concern for this
3931          * function. --BenH.
3932          */
3933         might_sleep();
3934
3935         /* This isn't perfectly race free, but a race here would be mostly harmless,
3936          * at worse, we'll do a spurrious blank and it's unlikely
3937          */
3938         del_timer(&console_timer);
3939         blank_timer_expired = 0;
3940
3941         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3942                 return;
3943         if (console_blanked)
3944                 unblank_screen();
3945         else if (blankinterval) {
3946                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3947                 blank_state = blank_normal_wait;
3948         }
3949 }
3950
3951 /*
3952  *      Palettes
3953  */
3954
3955 static void set_palette(struct vc_data *vc)
3956 {
3957         WARN_CONSOLE_UNLOCKED();
3958
3959         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3960                 vc->vc_sw->con_set_palette(vc, color_table);
3961 }
3962
3963 /*
3964  * Load palette into the DAC registers. arg points to a colour
3965  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3966  */
3967
3968 int con_set_cmap(unsigned char __user *arg)
3969 {
3970         int i, j, k;
3971         unsigned char colormap[3*16];
3972
3973         if (copy_from_user(colormap, arg, sizeof(colormap)))
3974                 return -EFAULT;
3975
3976         console_lock();
3977         for (i = k = 0; i < 16; i++) {
3978                 default_red[i] = colormap[k++];
3979                 default_grn[i] = colormap[k++];
3980                 default_blu[i] = colormap[k++];
3981         }
3982         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3983                 if (!vc_cons_allocated(i))
3984                         continue;
3985                 for (j = k = 0; j < 16; j++) {
3986                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3987                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3988                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3989                 }
3990                 set_palette(vc_cons[i].d);
3991         }
3992         console_unlock();
3993
3994         return 0;
3995 }
3996
3997 int con_get_cmap(unsigned char __user *arg)
3998 {
3999         int i, k;
4000         unsigned char colormap[3*16];
4001
4002         console_lock();
4003         for (i = k = 0; i < 16; i++) {
4004                 colormap[k++] = default_red[i];
4005                 colormap[k++] = default_grn[i];
4006                 colormap[k++] = default_blu[i];
4007         }
4008         console_unlock();
4009
4010         if (copy_to_user(arg, colormap, sizeof(colormap)))
4011                 return -EFAULT;
4012
4013         return 0;
4014 }
4015
4016 void reset_palette(struct vc_data *vc)
4017 {
4018         int j, k;
4019         for (j=k=0; j<16; j++) {
4020                 vc->vc_palette[k++] = default_red[j];
4021                 vc->vc_palette[k++] = default_grn[j];
4022                 vc->vc_palette[k++] = default_blu[j];
4023         }
4024         set_palette(vc);
4025 }
4026
4027 /*
4028  *  Font switching
4029  *
4030  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4031  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4032  *  depending on width) reserved for each character which is kinda wasty, but
4033  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4034  *  is up to the actual low-level console-driver convert data into its favorite
4035  *  format (maybe we should add a `fontoffset' field to the `display'
4036  *  structure so we won't have to convert the fontdata all the time.
4037  *  /Jes
4038  */
4039
4040 #define max_font_size 65536
4041
4042 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4043 {
4044         struct console_font font;
4045         int rc = -EINVAL;
4046         int c;
4047
4048         if (op->data) {
4049                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4050                 if (!font.data)
4051                         return -ENOMEM;
4052         } else
4053                 font.data = NULL;
4054
4055         console_lock();
4056         if (vc->vc_mode != KD_TEXT)
4057                 rc = -EINVAL;
4058         else if (vc->vc_sw->con_font_get)
4059                 rc = vc->vc_sw->con_font_get(vc, &font);
4060         else
4061                 rc = -ENOSYS;
4062         console_unlock();
4063
4064         if (rc)
4065                 goto out;
4066
4067         c = (font.width+7)/8 * 32 * font.charcount;
4068
4069         if (op->data && font.charcount > op->charcount)
4070                 rc = -ENOSPC;
4071         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4072                 if (font.width > op->width || font.height > op->height)
4073                         rc = -ENOSPC;
4074         } else {
4075                 if (font.width != 8)
4076                         rc = -EIO;
4077                 else if ((op->height && font.height > op->height) ||
4078                          font.height > 32)
4079                         rc = -ENOSPC;
4080         }
4081         if (rc)
4082                 goto out;
4083
4084         op->height = font.height;
4085         op->width = font.width;
4086         op->charcount = font.charcount;
4087
4088         if (op->data && copy_to_user(op->data, font.data, c))
4089                 rc = -EFAULT;
4090
4091 out:
4092         kfree(font.data);
4093         return rc;
4094 }
4095
4096 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4097 {
4098         struct console_font font;
4099         int rc = -EINVAL;
4100         int size;
4101
4102         if (vc->vc_mode != KD_TEXT)
4103                 return -EINVAL;
4104         if (!op->data)
4105                 return -EINVAL;
4106         if (op->charcount > 512)
4107                 return -EINVAL;
4108         if (!op->height) {              /* Need to guess font height [compat] */
4109                 int h, i;
4110                 u8 __user *charmap = op->data;
4111                 u8 tmp;
4112
4113                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4114                    so that we can get rid of this soon */
4115                 if (!(op->flags & KD_FONT_FLAG_OLD))
4116                         return -EINVAL;
4117                 for (h = 32; h > 0; h--)
4118                         for (i = 0; i < op->charcount; i++) {
4119                                 if (get_user(tmp, &charmap[32*i+h-1]))
4120                                         return -EFAULT;
4121                                 if (tmp)
4122                                         goto nonzero;
4123                         }
4124                 return -EINVAL;
4125         nonzero:
4126                 op->height = h;
4127         }
4128         if (op->width <= 0 || op->width > 32 || op->height > 32)
4129                 return -EINVAL;
4130         size = (op->width+7)/8 * 32 * op->charcount;
4131         if (size > max_font_size)
4132                 return -ENOSPC;
4133         font.charcount = op->charcount;
4134         font.height = op->height;
4135         font.width = op->width;
4136         font.data = memdup_user(op->data, size);
4137         if (IS_ERR(font.data))
4138                 return PTR_ERR(font.data);
4139         console_lock();
4140         if (vc->vc_mode != KD_TEXT)
4141                 rc = -EINVAL;
4142         else if (vc->vc_sw->con_font_set)
4143                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4144         else
4145                 rc = -ENOSYS;
4146         console_unlock();
4147         kfree(font.data);
4148         return rc;
4149 }
4150
4151 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4152 {
4153         struct console_font font = {.width = op->width, .height = op->height};
4154         char name[MAX_FONT_NAME];
4155         char *s = name;
4156         int rc;
4157
4158
4159         if (!op->data)
4160                 s = NULL;
4161         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4162                 return -EFAULT;
4163         else
4164                 name[MAX_FONT_NAME - 1] = 0;
4165
4166         console_lock();
4167         if (vc->vc_mode != KD_TEXT) {
4168                 console_unlock();
4169                 return -EINVAL;
4170         }
4171         if (vc->vc_sw->con_font_default)
4172                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4173         else
4174                 rc = -ENOSYS;
4175         console_unlock();
4176         if (!rc) {
4177                 op->width = font.width;
4178                 op->height = font.height;
4179         }
4180         return rc;
4181 }
4182
4183 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4184 {
4185         int con = op->height;
4186         int rc;
4187
4188
4189         console_lock();
4190         if (vc->vc_mode != KD_TEXT)
4191                 rc = -EINVAL;
4192         else if (!vc->vc_sw->con_font_copy)
4193                 rc = -ENOSYS;
4194         else if (con < 0 || !vc_cons_allocated(con))
4195                 rc = -ENOTTY;
4196         else if (con == vc->vc_num)     /* nothing to do */
4197                 rc = 0;
4198         else
4199                 rc = vc->vc_sw->con_font_copy(vc, con);
4200         console_unlock();
4201         return rc;
4202 }
4203
4204 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4205 {
4206         switch (op->op) {
4207         case KD_FONT_OP_SET:
4208                 return con_font_set(vc, op);
4209         case KD_FONT_OP_GET:
4210                 return con_font_get(vc, op);
4211         case KD_FONT_OP_SET_DEFAULT:
4212                 return con_font_default(vc, op);
4213         case KD_FONT_OP_COPY:
4214                 return con_font_copy(vc, op);
4215         }
4216         return -ENOSYS;
4217 }
4218
4219 /*
4220  *      Interface exported to selection and vcs.
4221  */
4222
4223 /* used by selection */
4224 u16 screen_glyph(struct vc_data *vc, int offset)
4225 {
4226         u16 w = scr_readw(screenpos(vc, offset, 1));
4227         u16 c = w & 0xff;
4228
4229         if (w & vc->vc_hi_font_mask)
4230                 c |= 0x100;
4231         return c;
4232 }
4233 EXPORT_SYMBOL_GPL(screen_glyph);
4234
4235 /* used by vcs - note the word offset */
4236 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4237 {
4238         return screenpos(vc, 2 * w_offset, viewed);
4239 }
4240 EXPORT_SYMBOL_GPL(screen_pos);
4241
4242 void getconsxy(struct vc_data *vc, unsigned char *p)
4243 {
4244         p[0] = vc->vc_x;
4245         p[1] = vc->vc_y;
4246 }
4247
4248 void putconsxy(struct vc_data *vc, unsigned char *p)
4249 {
4250         hide_cursor(vc);
4251         gotoxy(vc, p[0], p[1]);
4252         set_cursor(vc);
4253 }
4254
4255 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4256 {
4257         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4258                 return softcursor_original;
4259         return scr_readw(org);
4260 }
4261
4262 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4263 {
4264         scr_writew(val, org);
4265         if ((unsigned long)org == vc->vc_pos) {
4266                 softcursor_original = -1;
4267                 add_softcursor(vc);
4268         }
4269 }
4270
4271 void vcs_scr_updated(struct vc_data *vc)
4272 {
4273         notify_update(vc);
4274 }
4275
4276 /*
4277  *      Visible symbols for modules
4278  */
4279
4280 EXPORT_SYMBOL(color_table);
4281 EXPORT_SYMBOL(default_red);
4282 EXPORT_SYMBOL(default_grn);
4283 EXPORT_SYMBOL(default_blu);
4284 EXPORT_SYMBOL(update_region);
4285 EXPORT_SYMBOL(redraw_screen);
4286 EXPORT_SYMBOL(vc_resize);
4287 EXPORT_SYMBOL(fg_console);
4288 EXPORT_SYMBOL(console_blank_hook);
4289 EXPORT_SYMBOL(console_blanked);
4290 EXPORT_SYMBOL(vc_cons);
4291 EXPORT_SYMBOL(global_cursor_default);
4292 #ifndef VT_SINGLE_DRIVER
4293 EXPORT_SYMBOL(give_up_console);
4294 #endif