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