drivers/tty/vt/vt.c

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