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   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/vt_kern.h>
  90 #include <linux/selection.h>
  91 #include <linux/tiocl.h>
  92 #include <linux/kbd_kern.h>
  93 #include <linux/consolemap.h>
  94 #include <linux/timer.h>
  95 #include <linux/interrupt.h>
  96 #include <linux/workqueue.h>
  97 #include <linux/bootmem.h>
  98 #include <linux/pm.h>
  99 #include <linux/font.h>
 100 #include <linux/bitops.h>
 101
 102 #include <asm/io.h>
 103 #include <asm/system.h>
 104 #include <asm/uaccess.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111
 112 struct con_driver {
 113         const struct consw *con;
 114         const char *desc;
 115         struct device *dev;
 116         int node;
 117         int first;
 118         int last;
 119         int flag;
 120 };
 121
 122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 123 const struct consw *conswitchp;
 124
 125 /* A bitmap for codes <32. A bit of 1 indicates that the code
 126  * corresponding to that bit number invokes some special action
 127  * (such as cursor movement) and should not be displayed as a
 128  * glyph unless the disp_ctrl mode is explicitly enabled.
 129  */
 130 #define CTRL_ACTION 0x0d00ff81
 131 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 132
 133 /*
 134  * Here is the default bell parameters: 750HZ, 1/8th of a second
 135  */
 136 #define DEFAULT_BELL_PITCH      750
 137 #define DEFAULT_BELL_DURATION   (HZ/8)
 138
 139 struct vc vc_cons [MAX_NR_CONSOLES];
 140
 141 #ifndef VT_SINGLE_DRIVER
 142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 143 #endif
 144
 145 static int con_open(struct tty_struct *, struct file *);
 146 static void vc_init(struct vc_data *vc, unsigned int rows,
 147                     unsigned int cols, int do_clear);
 148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 149 static void save_cur(struct vc_data *vc);
 150 static void reset_terminal(struct vc_data *vc, int do_clear);
 151 static void con_flush_chars(struct tty_struct *tty);
 152 static int set_vesa_blanking(char __user *p);
 153 static void set_cursor(struct vc_data *vc);
 154 static void hide_cursor(struct vc_data *vc);
 155 static void console_callback(struct work_struct *ignored);
 156 static void blank_screen_t(unsigned long dummy);
 157 static void set_palette(struct vc_data *vc);
 158
 159 static int printable;           /* Is console ready for printing? */
 160
 161 /*
 162  * ignore_poke: don't unblank the screen when things are typed.  This is
 163  * mainly for the privacy of braille terminal users.
 164  */
 165 static int ignore_poke;
 166
 167 int do_poke_blanked_console;
 168 int console_blanked;
 169
 170 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 171 static int blankinterval = 10*60*HZ;
 172 static int vesa_off_interval;
 173
 174 static DECLARE_WORK(console_work, console_callback);
 175
 176 /*
 177  * fg_console is the current virtual console,
 178  * last_console is the last used one,
 179  * want_console is the console we want to switch to,
 180  * kmsg_redirect is the console for kernel messages,
 181  */
 182 int fg_console;
 183 int last_console;
 184 int want_console = -1;
 185 int kmsg_redirect;
 186
 187 /*
 188  * For each existing display, we have a pointer to console currently visible
 189  * on that display, allowing consoles other than fg_console to be refreshed
 190  * appropriately. Unless the low-level driver supplies its own display_fg
 191  * variable, we use this one for the "master display".
 192  */
 193 static struct vc_data *master_display_fg;
 194
 195 /*
 196  * Unfortunately, we need to delay tty echo when we're currently writing to the
 197  * console since the code is (and always was) not re-entrant, so we schedule
 198  * all flip requests to process context with schedule-task() and run it from
 199  * console_callback().
 200  */
 201
 202 /*
 203  * For the same reason, we defer scrollback to the console callback.
 204  */
 205 static int scrollback_delta;
 206
 207 /*
 208  * Hook so that the power management routines can (un)blank
 209  * the console on our behalf.
 210  */
 211 int (*console_blank_hook)(int);
 212
 213 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 214 static int blank_state;
 215 static int blank_timer_expired;
 216 enum {
 217         blank_off = 0,
 218         blank_normal_wait,
 219         blank_vesa_wait,
 220 };
 221
 222 /*
 223  *      Low-Level Functions
 224  */
 225
 226 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 227
 228 #ifdef VT_BUF_VRAM_ONLY
 229 #define DO_UPDATE(vc)   0
 230 #else
 231 #define DO_UPDATE(vc)   CON_IS_VISIBLE(vc)
 232 #endif
 233
 234 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 235 {
 236         unsigned short *p;
 237
 238         if (!viewed)
 239                 p = (unsigned short *)(vc->vc_origin + offset);
 240         else if (!vc->vc_sw->con_screen_pos)
 241                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 242         else
 243                 p = vc->vc_sw->con_screen_pos(vc, offset);
 244         return p;
 245 }
 246
 247 static inline void scrolldelta(int lines)
 248 {
 249         scrollback_delta += lines;
 250         schedule_console_callback();
 251 }
 252
 253 void schedule_console_callback(void)
 254 {
 255         schedule_work(&console_work);
 256 }
 257
 258 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 259 {
 260         unsigned short *d, *s;
 261
 262         if (t+nr >= b)
 263                 nr = b - t - 1;
 264         if (b > vc->vc_rows || t >= b || nr < 1)
 265                 return;
 266         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 267                 return;
 268         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 269         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 270         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 271         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 272                     vc->vc_size_row * nr);
 273 }
 274
 275 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 276 {
 277         unsigned short *s;
 278         unsigned int step;
 279
 280         if (t+nr >= b)
 281                 nr = b - t - 1;
 282         if (b > vc->vc_rows || t >= b || nr < 1)
 283                 return;
 284         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 285                 return;
 286         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 287         step = vc->vc_cols * nr;
 288         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 289         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 290 }
 291
 292 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 293 {
 294 #ifndef VT_BUF_VRAM_ONLY
 295         unsigned int xx, yy, offset;
 296         u16 *p;
 297
 298         p = (u16 *) start;
 299         if (!vc->vc_sw->con_getxy) {
 300                 offset = (start - vc->vc_origin) / 2;
 301                 xx = offset % vc->vc_cols;
 302                 yy = offset / vc->vc_cols;
 303         } else {
 304                 int nxx, nyy;
 305                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 306                 xx = nxx; yy = nyy;
 307         }
 308         for(;;) {
 309                 u16 attrib = scr_readw(p) & 0xff00;
 310                 int startx = xx;
 311                 u16 *q = p;
 312                 while (xx < vc->vc_cols && count) {
 313                         if (attrib != (scr_readw(p) & 0xff00)) {
 314                                 if (p > q)
 315                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 316                                 startx = xx;
 317                                 q = p;
 318                                 attrib = scr_readw(p) & 0xff00;
 319                         }
 320                         p++;
 321                         xx++;
 322                         count--;
 323                 }
 324                 if (p > q)
 325                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 326                 if (!count)
 327                         break;
 328                 xx = 0;
 329                 yy++;
 330                 if (vc->vc_sw->con_getxy) {
 331                         p = (u16 *)start;
 332                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 333                 }
 334         }
 335 #endif
 336 }
 337
 338 void update_region(struct vc_data *vc, unsigned long start, int count)
 339 {
 340         WARN_CONSOLE_UNLOCKED();
 341
 342         if (DO_UPDATE(vc)) {
 343                 hide_cursor(vc);
 344                 do_update_region(vc, start, count);
 345                 set_cursor(vc);
 346         }
 347 }
 348
 349 /* Structure of attributes is hardware-dependent */
 350
 351 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
 352 {
 353         if (vc->vc_sw->con_build_attr)
 354                 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
 355
 356 #ifndef VT_BUF_VRAM_ONLY
 357 /*
 358  * ++roman: I completely changed the attribute format for monochrome
 359  * mode (!can_do_color). The formerly used MDA (monochrome display
 360  * adapter) format didn't allow the combination of certain effects.
 361  * Now the attribute is just a bit vector:
 362  *  Bit 0..1: intensity (0..2)
 363  *  Bit 2   : underline
 364  *  Bit 3   : reverse
 365  *  Bit 7   : blink
 366  */
 367         {
 368         u8 a = vc->vc_color;
 369         if (!vc->vc_can_do_color)
 370                 return _intensity |
 371                        (_underline ? 4 : 0) |
 372                        (_reverse ? 8 : 0) |
 373                        (_blink ? 0x80 : 0);
 374         if (_underline)
 375                 a = (a & 0xf0) | vc->vc_ulcolor;
 376         else if (_intensity == 0)
 377                 a = (a & 0xf0) | vc->vc_ulcolor;
 378         if (_reverse)
 379                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 380         if (_blink)
 381                 a ^= 0x80;
 382         if (_intensity == 2)
 383                 a ^= 0x08;
 384         if (vc->vc_hi_font_mask == 0x100)
 385                 a <<= 1;
 386         return a;
 387         }
 388 #else
 389         return 0;
 390 #endif
 391 }
 392
 393 static void update_attr(struct vc_data *vc)
 394 {
 395         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
 396         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
 397 }
 398
 399 /* Note: inverting the screen twice should revert to the original state */
 400 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 401 {
 402         unsigned short *p;
 403
 404         WARN_CONSOLE_UNLOCKED();
 405
 406         count /= 2;
 407         p = screenpos(vc, offset, viewed);
 408         if (vc->vc_sw->con_invert_region)
 409                 vc->vc_sw->con_invert_region(vc, p, count);
 410 #ifndef VT_BUF_VRAM_ONLY
 411         else {
 412                 u16 *q = p;
 413                 int cnt = count;
 414                 u16 a;
 415
 416                 if (!vc->vc_can_do_color) {
 417                         while (cnt--) {
 418                             a = scr_readw(q);
 419                             a ^= 0x0800;
 420                             scr_writew(a, q);
 421                             q++;
 422                         }
 423                 } else if (vc->vc_hi_font_mask == 0x100) {
 424                         while (cnt--) {
 425                                 a = scr_readw(q);
 426                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 427                                 scr_writew(a, q);
 428                                 q++;
 429                         }
 430                 } else {
 431                         while (cnt--) {
 432                                 a = scr_readw(q);
 433                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 434                                 scr_writew(a, q);
 435                                 q++;
 436                         }
 437                 }
 438         }
 439 #endif
 440         if (DO_UPDATE(vc))
 441                 do_update_region(vc, (unsigned long) p, count);
 442 }
 443
 444 /* used by selection: complement pointer position */
 445 void complement_pos(struct vc_data *vc, int offset)
 446 {
 447         static int old_offset = -1;
 448         static unsigned short old;
 449         static unsigned short oldx, oldy;
 450
 451         WARN_CONSOLE_UNLOCKED();
 452
 453         if (old_offset != -1 && old_offset >= 0 &&
 454             old_offset < vc->vc_screenbuf_size) {
 455                 scr_writew(old, screenpos(vc, old_offset, 1));
 456                 if (DO_UPDATE(vc))
 457                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 458         }
 459
 460         old_offset = offset;
 461
 462         if (offset != -1 && offset >= 0 &&
 463             offset < vc->vc_screenbuf_size) {
 464                 unsigned short new;
 465                 unsigned short *p;
 466                 p = screenpos(vc, offset, 1);
 467                 old = scr_readw(p);
 468                 new = old ^ vc->vc_complement_mask;
 469                 scr_writew(new, p);
 470                 if (DO_UPDATE(vc)) {
 471                         oldx = (offset >> 1) % vc->vc_cols;
 472                         oldy = (offset >> 1) / vc->vc_cols;
 473                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 474                 }
 475         }
 476
 477 }
 478
 479 static void insert_char(struct vc_data *vc, unsigned int nr)
 480 {
 481         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 482
 483         p = q + vc->vc_cols - nr - vc->vc_x;
 484         while (--p >= q)
 485                 scr_writew(scr_readw(p), p + nr);
 486         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 487         vc->vc_need_wrap = 0;
 488         if (DO_UPDATE(vc)) {
 489                 unsigned short oldattr = vc->vc_attr;
 490                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 491                                      vc->vc_cols - vc->vc_x - nr);
 492                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 493                 while (nr--)
 494                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 495                 vc->vc_attr = oldattr;
 496         }
 497 }
 498
 499 static void delete_char(struct vc_data *vc, unsigned int nr)
 500 {
 501         unsigned int i = vc->vc_x;
 502         unsigned short *p = (unsigned short *)vc->vc_pos;
 503
 504         while (++i <= vc->vc_cols - nr) {
 505                 scr_writew(scr_readw(p+nr), p);
 506                 p++;
 507         }
 508         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 509         vc->vc_need_wrap = 0;
 510         if (DO_UPDATE(vc)) {
 511                 unsigned short oldattr = vc->vc_attr;
 512                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 513                                      vc->vc_cols - vc->vc_x - nr);
 514                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 515                 while (nr--)
 516                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 517                                      vc->vc_cols - 1 - nr);
 518                 vc->vc_attr = oldattr;
 519         }
 520 }
 521
 522 static int softcursor_original;
 523
 524 static void add_softcursor(struct vc_data *vc)
 525 {
 526         int i = scr_readw((u16 *) vc->vc_pos);
 527         u32 type = vc->vc_cursor_type;
 528
 529         if (! (type & 0x10)) return;
 530         if (softcursor_original != -1) return;
 531         softcursor_original = i;
 532         i |= ((type >> 8) & 0xff00 );
 533         i ^= ((type) & 0xff00 );
 534         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 535         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 536         scr_writew(i, (u16 *) vc->vc_pos);
 537         if (DO_UPDATE(vc))
 538                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 539 }
 540
 541 static void hide_softcursor(struct vc_data *vc)
 542 {
 543         if (softcursor_original != -1) {
 544                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 545                 if (DO_UPDATE(vc))
 546                         vc->vc_sw->con_putc(vc, softcursor_original,
 547                                         vc->vc_y, vc->vc_x);
 548                 softcursor_original = -1;
 549         }
 550 }
 551
 552 static void hide_cursor(struct vc_data *vc)
 553 {
 554         if (vc == sel_cons)
 555                 clear_selection();
 556         vc->vc_sw->con_cursor(vc, CM_ERASE);
 557         hide_softcursor(vc);
 558 }
 559
 560 static void set_cursor(struct vc_data *vc)
 561 {
 562         if (!IS_FG(vc) || console_blanked ||
 563             vc->vc_mode == KD_GRAPHICS)
 564                 return;
 565         if (vc->vc_deccm) {
 566                 if (vc == sel_cons)
 567                         clear_selection();
 568                 add_softcursor(vc);
 569                 if ((vc->vc_cursor_type & 0x0f) != 1)
 570                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 571         } else
 572                 hide_cursor(vc);
 573 }
 574
 575 static void set_origin(struct vc_data *vc)
 576 {
 577         WARN_CONSOLE_UNLOCKED();
 578
 579         if (!CON_IS_VISIBLE(vc) ||
 580             !vc->vc_sw->con_set_origin ||
 581             !vc->vc_sw->con_set_origin(vc))
 582                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 583         vc->vc_visible_origin = vc->vc_origin;
 584         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 585         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 586 }
 587
 588 static inline void save_screen(struct vc_data *vc)
 589 {
 590         WARN_CONSOLE_UNLOCKED();
 591
 592         if (vc->vc_sw->con_save_screen)
 593                 vc->vc_sw->con_save_screen(vc);
 594 }
 595
 596 /*
 597  *      Redrawing of screen
 598  */
 599
 600 static void clear_buffer_attributes(struct vc_data *vc)
 601 {
 602         unsigned short *p = (unsigned short *)vc->vc_origin;
 603         int count = vc->vc_screenbuf_size / 2;
 604         int mask = vc->vc_hi_font_mask | 0xff;
 605
 606         for (; count > 0; count--, p++) {
 607                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 608         }
 609 }
 610
 611 void redraw_screen(struct vc_data *vc, int is_switch)
 612 {
 613         int redraw = 0;
 614
 615         WARN_CONSOLE_UNLOCKED();
 616
 617         if (!vc) {
 618                 /* strange ... */
 619                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 620                 return;
 621         }
 622
 623         if (is_switch) {
 624                 struct vc_data *old_vc = vc_cons[fg_console].d;
 625                 if (old_vc == vc)
 626                         return;
 627                 if (!CON_IS_VISIBLE(vc))
 628                         redraw = 1;
 629                 *vc->vc_display_fg = vc;
 630                 fg_console = vc->vc_num;
 631                 hide_cursor(old_vc);
 632                 if (!CON_IS_VISIBLE(old_vc)) {
 633                         save_screen(old_vc);
 634                         set_origin(old_vc);
 635                 }
 636         } else {
 637                 hide_cursor(vc);
 638                 redraw = 1;
 639         }
 640
 641         if (redraw) {
 642                 int update;
 643                 int old_was_color = vc->vc_can_do_color;
 644
 645                 set_origin(vc);
 646                 update = vc->vc_sw->con_switch(vc);
 647                 set_palette(vc);
 648                 /*
 649                  * If console changed from mono<->color, the best we can do
 650                  * is to clear the buffer attributes. As it currently stands,
 651                  * rebuilding new attributes from the old buffer is not doable
 652                  * without overly complex code.
 653                  */
 654                 if (old_was_color != vc->vc_can_do_color) {
 655                         update_attr(vc);
 656                         clear_buffer_attributes(vc);
 657                 }
 658                 if (update && vc->vc_mode != KD_GRAPHICS)
 659                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 660         }
 661         set_cursor(vc);
 662         if (is_switch) {
 663                 set_leds();
 664                 compute_shiftstate();
 665         }
 666 }
 667
 668 /*
 669  *      Allocation, freeing and resizing of VTs.
 670  */
 671
 672 int vc_cons_allocated(unsigned int i)
 673 {
 674         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 675 }
 676
 677 static void visual_init(struct vc_data *vc, int num, int init)
 678 {
 679         /* ++Geert: vc->vc_sw->con_init determines console size */
 680         if (vc->vc_sw)
 681                 module_put(vc->vc_sw->owner);
 682         vc->vc_sw = conswitchp;
 683 #ifndef VT_SINGLE_DRIVER
 684         if (con_driver_map[num])
 685                 vc->vc_sw = con_driver_map[num];
 686 #endif
 687         __module_get(vc->vc_sw->owner);
 688         vc->vc_num = num;
 689         vc->vc_display_fg = &master_display_fg;
 690         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 691         vc->vc_uni_pagedir = 0;
 692         vc->vc_hi_font_mask = 0;
 693         vc->vc_complement_mask = 0;
 694         vc->vc_can_do_color = 0;
 695         vc->vc_sw->con_init(vc, init);
 696         if (!vc->vc_complement_mask)
 697                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 698         vc->vc_s_complement_mask = vc->vc_complement_mask;
 699         vc->vc_size_row = vc->vc_cols << 1;
 700         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 701 }
 702
 703 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 704 {
 705         WARN_CONSOLE_UNLOCKED();
 706
 707         if (currcons >= MAX_NR_CONSOLES)
 708                 return -ENXIO;
 709         if (!vc_cons[currcons].d) {
 710             struct vc_data *vc;
 711
 712             /* prevent users from taking too much memory */
 713             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 714               return -EPERM;
 715
 716             /* due to the granularity of kmalloc, we waste some memory here */
 717             /* the alloc is done in two steps, to optimize the common situation
 718                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 719             /* although the numbers above are not valid since long ago, the
 720                point is still up-to-date and the comment still has its value
 721                even if only as a historical artifact.  --mj, July 1998 */
 722             vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
 723             if (!vc)
 724                 return -ENOMEM;
 725             memset(vc, 0, sizeof(*vc));
 726             vc_cons[currcons].d = vc;
 727             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 728             visual_init(vc, currcons, 1);
 729             if (!*vc->vc_uni_pagedir_loc)
 730                 con_set_default_unimap(vc);
 731             if (!vc->vc_kmalloced)
 732                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 733             if (!vc->vc_screenbuf) {
 734                 kfree(vc);
 735                 vc_cons[currcons].d = NULL;
 736                 return -ENOMEM;
 737             }
 738             vc->vc_kmalloced = 1;
 739             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 740         }
 741         return 0;
 742 }
 743
 744 static inline int resize_screen(struct vc_data *vc, int width, int height)
 745 {
 746         /* Resizes the resolution of the display adapater */
 747         int err = 0;
 748
 749         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 750                 err = vc->vc_sw->con_resize(vc, width, height);
 751         return err;
 752 }
 753
 754 /*
 755  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 756  * [this is to be used together with some user program
 757  * like resize that changes the hardware videomode]
 758  */
 759 #define VC_RESIZE_MAXCOL (32767)
 760 #define VC_RESIZE_MAXROW (32767)
 761 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 762 {
 763         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 764         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 765         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 766         unsigned int end;
 767         unsigned short *newscreen;
 768
 769         WARN_CONSOLE_UNLOCKED();
 770
 771         if (!vc)
 772                 return -ENXIO;
 773
 774         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 775                 return -EINVAL;
 776
 777         new_cols = (cols ? cols : vc->vc_cols);
 778         new_rows = (lines ? lines : vc->vc_rows);
 779         new_row_size = new_cols << 1;
 780         new_screen_size = new_row_size * new_rows;
 781
 782         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 783                 return 0;
 784
 785         newscreen = kmalloc(new_screen_size, GFP_USER);
 786         if (!newscreen)
 787                 return -ENOMEM;
 788
 789         old_rows = vc->vc_rows;
 790         old_cols = vc->vc_cols;
 791         old_row_size = vc->vc_size_row;
 792         old_screen_size = vc->vc_screenbuf_size;
 793
 794         err = resize_screen(vc, new_cols, new_rows);
 795         if (err) {
 796                 kfree(newscreen);
 797                 return err;
 798         }
 799
 800         vc->vc_rows = new_rows;
 801         vc->vc_cols = new_cols;
 802         vc->vc_size_row = new_row_size;
 803         vc->vc_screenbuf_size = new_screen_size;
 804
 805         rlth = min(old_row_size, new_row_size);
 806         rrem = new_row_size - rlth;
 807         old_origin = vc->vc_origin;
 808         new_origin = (long) newscreen;
 809         new_scr_end = new_origin + new_screen_size;
 810
 811         if (vc->vc_y > new_rows) {
 812                 if (old_rows - vc->vc_y < new_rows) {
 813                         /*
 814                          * Cursor near the bottom, copy contents from the
 815                          * bottom of buffer
 816                          */
 817                         old_origin += (old_rows - new_rows) * old_row_size;
 818                         end = vc->vc_scr_end;
 819                 } else {
 820                         /*
 821                          * Cursor is in no man's land, copy 1/2 screenful
 822                          * from the top and bottom of cursor position
 823                          */
 824                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 825                         end = old_origin + (old_row_size * new_rows);
 826                 }
 827         } else
 828                 /*
 829                  * Cursor near the top, copy contents from the top of buffer
 830                  */
 831                 end = (old_rows > new_rows) ? old_origin +
 832                         (old_row_size * new_rows) :
 833                         vc->vc_scr_end;
 834
 835         update_attr(vc);
 836
 837         while (old_origin < end) {
 838                 scr_memcpyw((unsigned short *) new_origin,
 839                             (unsigned short *) old_origin, rlth);
 840                 if (rrem)
 841                         scr_memsetw((void *)(new_origin + rlth),
 842                                     vc->vc_video_erase_char, rrem);
 843                 old_origin += old_row_size;
 844                 new_origin += new_row_size;
 845         }
 846         if (new_scr_end > new_origin)
 847                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 848                             new_scr_end - new_origin);
 849         if (vc->vc_kmalloced)
 850                 kfree(vc->vc_screenbuf);
 851         vc->vc_screenbuf = newscreen;
 852         vc->vc_kmalloced = 1;
 853         vc->vc_screenbuf_size = new_screen_size;
 854         set_origin(vc);
 855
 856         /* do part of a reset_terminal() */
 857         vc->vc_top = 0;
 858         vc->vc_bottom = vc->vc_rows;
 859         gotoxy(vc, vc->vc_x, vc->vc_y);
 860         save_cur(vc);
 861
 862         if (vc->vc_tty) {
 863                 struct winsize ws, *cws = &vc->vc_tty->winsize;
 864
 865                 memset(&ws, 0, sizeof(ws));
 866                 ws.ws_row = vc->vc_rows;
 867                 ws.ws_col = vc->vc_cols;
 868                 ws.ws_ypixel = vc->vc_scan_lines;
 869                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
 870                     vc->vc_tty->pgrp)
 871                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
 872                 *cws = ws;
 873         }
 874
 875         if (CON_IS_VISIBLE(vc))
 876                 update_screen(vc);
 877         return err;
 878 }
 879
 880 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 881 {
 882         int rc;
 883
 884         acquire_console_sem();
 885         rc = vc_resize(vc, cols, lines);
 886         release_console_sem();
 887         return rc;
 888 }
 889
 890 void vc_deallocate(unsigned int currcons)
 891 {
 892         WARN_CONSOLE_UNLOCKED();
 893
 894         if (vc_cons_allocated(currcons)) {
 895                 struct vc_data *vc = vc_cons[currcons].d;
 896                 vc->vc_sw->con_deinit(vc);
 897                 put_pid(vc->vt_pid);
 898                 module_put(vc->vc_sw->owner);
 899                 if (vc->vc_kmalloced)
 900                         kfree(vc->vc_screenbuf);
 901                 if (currcons >= MIN_NR_CONSOLES)
 902                         kfree(vc);
 903                 vc_cons[currcons].d = NULL;
 904         }
 905 }
 906
 907 /*
 908  *      VT102 emulator
 909  */
 910
 911 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 912 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 913 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 914
 915 #define decarm          VC_REPEAT
 916 #define decckm          VC_CKMODE
 917 #define kbdapplic       VC_APPLIC
 918 #define lnm             VC_CRLF
 919
 920 /*
 921  * this is what the terminal answers to a ESC-Z or csi0c query.
 922  */
 923 #define VT100ID "\033[?1;2c"
 924 #define VT102ID "\033[?6c"
 925
 926 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 927                                        8,12,10,14, 9,13,11,15 };
 928
 929 /* the default colour table, for VGA+ colour systems */
 930 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 931     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 932 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 933     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 934 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 935     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 936
 937 /*
 938  * gotoxy() must verify all boundaries, because the arguments
 939  * might also be negative. If the given position is out of
 940  * bounds, the cursor is placed at the nearest margin.
 941  */
 942 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 943 {
 944         int min_y, max_y;
 945
 946         if (new_x < 0)
 947                 vc->vc_x = 0;
 948         else {
 949                 if (new_x >= vc->vc_cols)
 950                         vc->vc_x = vc->vc_cols - 1;
 951                 else
 952                         vc->vc_x = new_x;
 953         }
 954
 955         if (vc->vc_decom) {
 956                 min_y = vc->vc_top;
 957                 max_y = vc->vc_bottom;
 958         } else {
 959                 min_y = 0;
 960                 max_y = vc->vc_rows;
 961         }
 962         if (new_y < min_y)
 963                 vc->vc_y = min_y;
 964         else if (new_y >= max_y)
 965                 vc->vc_y = max_y - 1;
 966         else
 967                 vc->vc_y = new_y;
 968         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
 969         vc->vc_need_wrap = 0;
 970 }
 971
 972 /* for absolute user moves, when decom is set */
 973 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
 974 {
 975         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
 976 }
 977
 978 void scrollback(struct vc_data *vc, int lines)
 979 {
 980         if (!lines)
 981                 lines = vc->vc_rows / 2;
 982         scrolldelta(-lines);
 983 }
 984
 985 void scrollfront(struct vc_data *vc, int lines)
 986 {
 987         if (!lines)
 988                 lines = vc->vc_rows / 2;
 989         scrolldelta(lines);
 990 }
 991
 992 static void lf(struct vc_data *vc)
 993 {
 994         /* don't scroll if above bottom of scrolling region, or
 995          * if below scrolling region
 996          */
 997         if (vc->vc_y + 1 == vc->vc_bottom)
 998                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
 999         else if (vc->vc_y < vc->vc_rows - 1) {
1000                 vc->vc_y++;
1001                 vc->vc_pos += vc->vc_size_row;
1002         }
1003         vc->vc_need_wrap = 0;
1004 }
1005
1006 static void ri(struct vc_data *vc)
1007 {
1008         /* don't scroll if below top of scrolling region, or
1009          * if above scrolling region
1010          */
1011         if (vc->vc_y == vc->vc_top)
1012                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1013         else if (vc->vc_y > 0) {
1014                 vc->vc_y--;
1015                 vc->vc_pos -= vc->vc_size_row;
1016         }
1017         vc->vc_need_wrap = 0;
1018 }
1019
1020 static inline void cr(struct vc_data *vc)
1021 {
1022         vc->vc_pos -= vc->vc_x << 1;
1023         vc->vc_need_wrap = vc->vc_x = 0;
1024 }
1025
1026 static inline void bs(struct vc_data *vc)
1027 {
1028         if (vc->vc_x) {
1029                 vc->vc_pos -= 2;
1030                 vc->vc_x--;
1031                 vc->vc_need_wrap = 0;
1032         }
1033 }
1034
1035 static inline void del(struct vc_data *vc)
1036 {
1037         /* ignored */
1038 }
1039
1040 static void csi_J(struct vc_data *vc, int vpar)
1041 {
1042         unsigned int count;
1043         unsigned short * start;
1044
1045         switch (vpar) {
1046                 case 0: /* erase from cursor to end of display */
1047                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1048                         start = (unsigned short *)vc->vc_pos;
1049                         if (DO_UPDATE(vc)) {
1050                                 /* do in two stages */
1051                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1052                                               vc->vc_cols - vc->vc_x);
1053                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1054                                               vc->vc_rows - vc->vc_y - 1,
1055                                               vc->vc_cols);
1056                         }
1057                         break;
1058                 case 1: /* erase from start to cursor */
1059                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1060                         start = (unsigned short *)vc->vc_origin;
1061                         if (DO_UPDATE(vc)) {
1062                                 /* do in two stages */
1063                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1064                                               vc->vc_cols);
1065                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1066                                               vc->vc_x + 1);
1067                         }
1068                         break;
1069                 case 2: /* erase whole display */
1070                         count = vc->vc_cols * vc->vc_rows;
1071                         start = (unsigned short *)vc->vc_origin;
1072                         if (DO_UPDATE(vc))
1073                                 vc->vc_sw->con_clear(vc, 0, 0,
1074                                               vc->vc_rows,
1075                                               vc->vc_cols);
1076                         break;
1077                 default:
1078                         return;
1079         }
1080         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1081         vc->vc_need_wrap = 0;
1082 }
1083
1084 static void csi_K(struct vc_data *vc, int vpar)
1085 {
1086         unsigned int count;
1087         unsigned short * start;
1088
1089         switch (vpar) {
1090                 case 0: /* erase from cursor to end of line */
1091                         count = vc->vc_cols - vc->vc_x;
1092                         start = (unsigned short *)vc->vc_pos;
1093                         if (DO_UPDATE(vc))
1094                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1095                                                      vc->vc_cols - vc->vc_x);
1096                         break;
1097                 case 1: /* erase from start of line to cursor */
1098                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1099                         count = vc->vc_x + 1;
1100                         if (DO_UPDATE(vc))
1101                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1102                                                      vc->vc_x + 1);
1103                         break;
1104                 case 2: /* erase whole line */
1105                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1106                         count = vc->vc_cols;
1107                         if (DO_UPDATE(vc))
1108                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1109                                               vc->vc_cols);
1110                         break;
1111                 default:
1112                         return;
1113         }
1114         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1115         vc->vc_need_wrap = 0;
1116 }
1117
1118 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1119 {                                         /* not vt100? */
1120         int count;
1121
1122         if (!vpar)
1123                 vpar++;
1124         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1125
1126         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1127         if (DO_UPDATE(vc))
1128                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1129         vc->vc_need_wrap = 0;
1130 }
1131
1132 static void default_attr(struct vc_data *vc)
1133 {
1134         vc->vc_intensity = 1;
1135         vc->vc_underline = 0;
1136         vc->vc_reverse = 0;
1137         vc->vc_blink = 0;
1138         vc->vc_color = vc->vc_def_color;
1139 }
1140
1141 /* console_sem is held */
1142 static void csi_m(struct vc_data *vc)
1143 {
1144         int i;
1145
1146         for (i = 0; i <= vc->vc_npar; i++)
1147                 switch (vc->vc_par[i]) {
1148                         case 0: /* all attributes off */
1149                                 default_attr(vc);
1150                                 break;
1151                         case 1:
1152                                 vc->vc_intensity = 2;
1153                                 break;
1154                         case 2:
1155                                 vc->vc_intensity = 0;
1156                                 break;
1157                         case 4:
1158                                 vc->vc_underline = 1;
1159                                 break;
1160                         case 5:
1161                                 vc->vc_blink = 1;
1162                                 break;
1163                         case 7:
1164                                 vc->vc_reverse = 1;
1165                                 break;
1166                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1167                                   * Select primary font, don't display
1168                                   * control chars if defined, don't set
1169                                   * bit 8 on output.
1170                                   */
1171                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1172                                                 ? vc->vc_G0_charset
1173                                                 : vc->vc_G1_charset, vc);
1174                                 vc->vc_disp_ctrl = 0;
1175                                 vc->vc_toggle_meta = 0;
1176                                 break;
1177                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1178                                   * Select first alternate font, lets
1179                                   * chars < 32 be displayed as ROM chars.
1180                                   */
1181                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1182                                 vc->vc_disp_ctrl = 1;
1183                                 vc->vc_toggle_meta = 0;
1184                                 break;
1185                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1186                                   * Select second alternate font, toggle
1187                                   * high bit before displaying as ROM char.
1188                                   */
1189                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1190                                 vc->vc_disp_ctrl = 1;
1191                                 vc->vc_toggle_meta = 1;
1192                                 break;
1193                         case 21:
1194                         case 22:
1195                                 vc->vc_intensity = 1;
1196                                 break;
1197                         case 24:
1198                                 vc->vc_underline = 0;
1199                                 break;
1200                         case 25:
1201                                 vc->vc_blink = 0;
1202                                 break;
1203                         case 27:
1204                                 vc->vc_reverse = 0;
1205                                 break;
1206                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1207                                   * Enables underscore, white foreground
1208                                   * with white underscore (Linux - use
1209                                   * default foreground).
1210                                   */
1211                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1212                                 vc->vc_underline = 1;
1213                                 break;
1214                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1215                                   * Disable underline option.
1216                                   * Reset colour to default? It did this
1217                                   * before...
1218                                   */
1219                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1220                                 vc->vc_underline = 0;
1221                                 break;
1222                         case 49:
1223                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1224                                 break;
1225                         default:
1226                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1227                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1228                                                 | (vc->vc_color & 0xf0);
1229                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1230                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1231                                                 | (vc->vc_color & 0x0f);
1232                                 break;
1233                 }
1234         update_attr(vc);
1235 }
1236
1237 static void respond_string(const char *p, struct tty_struct *tty)
1238 {
1239         while (*p) {
1240                 tty_insert_flip_char(tty, *p, 0);
1241                 p++;
1242         }
1243         con_schedule_flip(tty);
1244 }
1245
1246 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1247 {
1248         char buf[40];
1249
1250         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1251         respond_string(buf, tty);
1252 }
1253
1254 static inline void status_report(struct tty_struct *tty)
1255 {
1256         respond_string("\033[0n", tty); /* Terminal ok */
1257 }
1258
1259 static inline void respond_ID(struct tty_struct * tty)
1260 {
1261         respond_string(VT102ID, tty);
1262 }
1263
1264 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1265 {
1266         char buf[8];
1267
1268         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1269                 (char)('!' + mry));
1270         respond_string(buf, tty);
1271 }
1272
1273 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1274 int mouse_reporting(void)
1275 {
1276         return vc_cons[fg_console].d->vc_report_mouse;
1277 }
1278
1279 /* console_sem is held */
1280 static void set_mode(struct vc_data *vc, int on_off)
1281 {
1282         int i;
1283
1284         for (i = 0; i <= vc->vc_npar; i++)
1285                 if (vc->vc_ques) {
1286                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1287                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1288                                 if (on_off)
1289                                         set_kbd(vc, decckm);
1290                                 else
1291                                         clr_kbd(vc, decckm);
1292                                 break;
1293                         case 3: /* 80/132 mode switch unimplemented */
1294                                 vc->vc_deccolm = on_off;
1295 #if 0
1296                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1297                                 /* this alone does not suffice; some user mode
1298                                    utility has to change the hardware regs */
1299 #endif
1300                                 break;
1301                         case 5:                 /* Inverted screen on/off */
1302                                 if (vc->vc_decscnm != on_off) {
1303                                         vc->vc_decscnm = on_off;
1304                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1305                                         update_attr(vc);
1306                                 }
1307                                 break;
1308                         case 6:                 /* Origin relative/absolute */
1309                                 vc->vc_decom = on_off;
1310                                 gotoxay(vc, 0, 0);
1311                                 break;
1312                         case 7:                 /* Autowrap on/off */
1313                                 vc->vc_decawm = on_off;
1314                                 break;
1315                         case 8:                 /* Autorepeat on/off */
1316                                 if (on_off)
1317                                         set_kbd(vc, decarm);
1318                                 else
1319                                         clr_kbd(vc, decarm);
1320                                 break;
1321                         case 9:
1322                                 vc->vc_report_mouse = on_off ? 1 : 0;
1323                                 break;
1324                         case 25:                /* Cursor on/off */
1325                                 vc->vc_deccm = on_off;
1326                                 break;
1327                         case 1000:
1328                                 vc->vc_report_mouse = on_off ? 2 : 0;
1329                                 break;
1330                         }
1331                 } else {
1332                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1333                         case 3:                 /* Monitor (display ctrls) */
1334                                 vc->vc_disp_ctrl = on_off;
1335                                 break;
1336                         case 4:                 /* Insert Mode on/off */
1337                                 vc->vc_decim = on_off;
1338                                 break;
1339                         case 20:                /* Lf, Enter == CrLf/Lf */
1340                                 if (on_off)
1341                                         set_kbd(vc, lnm);
1342                                 else
1343                                         clr_kbd(vc, lnm);
1344                                 break;
1345                         }
1346                 }
1347 }
1348
1349 /* console_sem is held */
1350 static void setterm_command(struct vc_data *vc)
1351 {
1352         switch(vc->vc_par[0]) {
1353                 case 1: /* set color for underline mode */
1354                         if (vc->vc_can_do_color &&
1355                                         vc->vc_par[1] < 16) {
1356                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1357                                 if (vc->vc_underline)
1358                                         update_attr(vc);
1359                         }
1360                         break;
1361                 case 2: /* set color for half intensity mode */
1362                         if (vc->vc_can_do_color &&
1363                                         vc->vc_par[1] < 16) {
1364                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1365                                 if (vc->vc_intensity == 0)
1366                                         update_attr(vc);
1367                         }
1368                         break;
1369                 case 8: /* store colors as defaults */
1370                         vc->vc_def_color = vc->vc_attr;
1371                         if (vc->vc_hi_font_mask == 0x100)
1372                                 vc->vc_def_color >>= 1;
1373                         default_attr(vc);
1374                         update_attr(vc);
1375                         break;
1376                 case 9: /* set blanking interval */
1377                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1378                         poke_blanked_console();
1379                         break;
1380                 case 10: /* set bell frequency in Hz */
1381                         if (vc->vc_npar >= 1)
1382                                 vc->vc_bell_pitch = vc->vc_par[1];
1383                         else
1384                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1385                         break;
1386                 case 11: /* set bell duration in msec */
1387                         if (vc->vc_npar >= 1)
1388                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1389                                         vc->vc_par[1] * HZ / 1000 : 0;
1390                         else
1391                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1392                         break;
1393                 case 12: /* bring specified console to the front */
1394                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1395                                 set_console(vc->vc_par[1] - 1);
1396                         break;
1397                 case 13: /* unblank the screen */
1398                         poke_blanked_console();
1399                         break;
1400                 case 14: /* set vesa powerdown interval */
1401                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1402                         break;
1403                 case 15: /* activate the previous console */
1404                         set_console(last_console);
1405                         break;
1406         }
1407 }
1408
1409 /* console_sem is held */
1410 static void csi_at(struct vc_data *vc, unsigned int nr)
1411 {
1412         if (nr > vc->vc_cols - vc->vc_x)
1413                 nr = vc->vc_cols - vc->vc_x;
1414         else if (!nr)
1415                 nr = 1;
1416         insert_char(vc, nr);
1417 }
1418
1419 /* console_sem is held */
1420 static void csi_L(struct vc_data *vc, unsigned int nr)
1421 {
1422         if (nr > vc->vc_rows - vc->vc_y)
1423                 nr = vc->vc_rows - vc->vc_y;
1424         else if (!nr)
1425                 nr = 1;
1426         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1427         vc->vc_need_wrap = 0;
1428 }
1429
1430 /* console_sem is held */
1431 static void csi_P(struct vc_data *vc, unsigned int nr)
1432 {
1433         if (nr > vc->vc_cols - vc->vc_x)
1434                 nr = vc->vc_cols - vc->vc_x;
1435         else if (!nr)
1436                 nr = 1;
1437         delete_char(vc, nr);
1438 }
1439
1440 /* console_sem is held */
1441 static void csi_M(struct vc_data *vc, unsigned int nr)
1442 {
1443         if (nr > vc->vc_rows - vc->vc_y)
1444                 nr = vc->vc_rows - vc->vc_y;
1445         else if (!nr)
1446                 nr=1;
1447         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1448         vc->vc_need_wrap = 0;
1449 }
1450
1451 /* console_sem is held (except via vc_init->reset_terminal */
1452 static void save_cur(struct vc_data *vc)
1453 {
1454         vc->vc_saved_x          = vc->vc_x;
1455         vc->vc_saved_y          = vc->vc_y;
1456         vc->vc_s_intensity      = vc->vc_intensity;
1457         vc->vc_s_underline      = vc->vc_underline;
1458         vc->vc_s_blink          = vc->vc_blink;
1459         vc->vc_s_reverse        = vc->vc_reverse;
1460         vc->vc_s_charset        = vc->vc_charset;
1461         vc->vc_s_color          = vc->vc_color;
1462         vc->vc_saved_G0         = vc->vc_G0_charset;
1463         vc->vc_saved_G1         = vc->vc_G1_charset;
1464 }
1465
1466 /* console_sem is held */
1467 static void restore_cur(struct vc_data *vc)
1468 {
1469         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1470         vc->vc_intensity        = vc->vc_s_intensity;
1471         vc->vc_underline        = vc->vc_s_underline;
1472         vc->vc_blink            = vc->vc_s_blink;
1473         vc->vc_reverse          = vc->vc_s_reverse;
1474         vc->vc_charset          = vc->vc_s_charset;
1475         vc->vc_color            = vc->vc_s_color;
1476         vc->vc_G0_charset       = vc->vc_saved_G0;
1477         vc->vc_G1_charset       = vc->vc_saved_G1;
1478         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1479         update_attr(vc);
1480         vc->vc_need_wrap = 0;
1481 }
1482
1483 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1484         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1485         ESpalette };
1486
1487 /* console_sem is held (except via vc_init()) */
1488 static void reset_terminal(struct vc_data *vc, int do_clear)
1489 {
1490         vc->vc_top              = 0;
1491         vc->vc_bottom           = vc->vc_rows;
1492         vc->vc_state            = ESnormal;
1493         vc->vc_ques             = 0;
1494         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1495         vc->vc_G0_charset       = LAT1_MAP;
1496         vc->vc_G1_charset       = GRAF_MAP;
1497         vc->vc_charset          = 0;
1498         vc->vc_need_wrap        = 0;
1499         vc->vc_report_mouse     = 0;
1500         vc->vc_utf              = 0;
1501         vc->vc_utf_count        = 0;
1502
1503         vc->vc_disp_ctrl        = 0;
1504         vc->vc_toggle_meta      = 0;
1505
1506         vc->vc_decscnm          = 0;
1507         vc->vc_decom            = 0;
1508         vc->vc_decawm           = 1;
1509         vc->vc_deccm            = 1;
1510         vc->vc_decim            = 0;
1511
1512         set_kbd(vc, decarm);
1513         clr_kbd(vc, decckm);
1514         clr_kbd(vc, kbdapplic);
1515         clr_kbd(vc, lnm);
1516         kbd_table[vc->vc_num].lockstate = 0;
1517         kbd_table[vc->vc_num].slockstate = 0;
1518         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1519         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1520         /* do not do set_leds here because this causes an endless tasklet loop
1521            when the keyboard hasn't been initialized yet */
1522
1523         vc->vc_cursor_type = CUR_DEFAULT;
1524         vc->vc_complement_mask = vc->vc_s_complement_mask;
1525
1526         default_attr(vc);
1527         update_attr(vc);
1528
1529         vc->vc_tab_stop[0]      = 0x01010100;
1530         vc->vc_tab_stop[1]      =
1531         vc->vc_tab_stop[2]      =
1532         vc->vc_tab_stop[3]      =
1533         vc->vc_tab_stop[4]      = 0x01010101;
1534
1535         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1536         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1537
1538         gotoxy(vc, 0, 0);
1539         save_cur(vc);
1540         if (do_clear)
1541             csi_J(vc, 2);
1542 }
1543
1544 /* console_sem is held */
1545 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1546 {
1547         /*
1548          *  Control characters can be used in the _middle_
1549          *  of an escape sequence.
1550          */
1551         switch (c) {
1552         case 0:
1553                 return;
1554         case 7:
1555                 if (vc->vc_bell_duration)
1556                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1557                 return;
1558         case 8:
1559                 bs(vc);
1560                 return;
1561         case 9:
1562                 vc->vc_pos -= (vc->vc_x << 1);
1563                 while (vc->vc_x < vc->vc_cols - 1) {
1564                         vc->vc_x++;
1565                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1566                                 break;
1567                 }
1568                 vc->vc_pos += (vc->vc_x << 1);
1569                 return;
1570         case 10: case 11: case 12:
1571                 lf(vc);
1572                 if (!is_kbd(vc, lnm))
1573                         return;
1574         case 13:
1575                 cr(vc);
1576                 return;
1577         case 14:
1578                 vc->vc_charset = 1;
1579                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1580                 vc->vc_disp_ctrl = 1;
1581                 return;
1582         case 15:
1583                 vc->vc_charset = 0;
1584                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1585                 vc->vc_disp_ctrl = 0;
1586                 return;
1587         case 24: case 26:
1588                 vc->vc_state = ESnormal;
1589                 return;
1590         case 27:
1591                 vc->vc_state = ESesc;
1592                 return;
1593         case 127:
1594                 del(vc);
1595                 return;
1596         case 128+27:
1597                 vc->vc_state = ESsquare;
1598                 return;
1599         }
1600         switch(vc->vc_state) {
1601         case ESesc:
1602                 vc->vc_state = ESnormal;
1603                 switch (c) {
1604                 case '[':
1605                         vc->vc_state = ESsquare;
1606                         return;
1607                 case ']':
1608                         vc->vc_state = ESnonstd;
1609                         return;
1610                 case '%':
1611                         vc->vc_state = ESpercent;
1612                         return;
1613                 case 'E':
1614                         cr(vc);
1615                         lf(vc);
1616                         return;
1617                 case 'M':
1618                         ri(vc);
1619                         return;
1620                 case 'D':
1621                         lf(vc);
1622                         return;
1623                 case 'H':
1624                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1625                         return;
1626                 case 'Z':
1627                         respond_ID(tty);
1628                         return;
1629                 case '7':
1630                         save_cur(vc);
1631                         return;
1632                 case '8':
1633                         restore_cur(vc);
1634                         return;
1635                 case '(':
1636                         vc->vc_state = ESsetG0;
1637                         return;
1638                 case ')':
1639                         vc->vc_state = ESsetG1;
1640                         return;
1641                 case '#':
1642                         vc->vc_state = EShash;
1643                         return;
1644                 case 'c':
1645                         reset_terminal(vc, 1);
1646                         return;
1647                 case '>':  /* Numeric keypad */
1648                         clr_kbd(vc, kbdapplic);
1649                         return;
1650                 case '=':  /* Appl. keypad */
1651                         set_kbd(vc, kbdapplic);
1652                         return;
1653                 }
1654                 return;
1655         case ESnonstd:
1656                 if (c=='P') {   /* palette escape sequence */
1657                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1658                                 vc->vc_par[vc->vc_npar] = 0;
1659                         vc->vc_npar = 0;
1660                         vc->vc_state = ESpalette;
1661                         return;
1662                 } else if (c=='R') {   /* reset palette */
1663                         reset_palette(vc);
1664                         vc->vc_state = ESnormal;
1665                 } else
1666                         vc->vc_state = ESnormal;
1667                 return;
1668         case ESpalette:
1669                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1670                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1671                         if (vc->vc_npar == 7) {
1672                                 int i = vc->vc_par[0] * 3, j = 1;
1673                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1674                                 vc->vc_palette[i++] += vc->vc_par[j++];
1675                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1676                                 vc->vc_palette[i++] += vc->vc_par[j++];
1677                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1678                                 vc->vc_palette[i] += vc->vc_par[j];
1679                                 set_palette(vc);
1680                                 vc->vc_state = ESnormal;
1681                         }
1682                 } else
1683                         vc->vc_state = ESnormal;
1684                 return;
1685         case ESsquare:
1686                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1687                         vc->vc_par[vc->vc_npar] = 0;
1688                 vc->vc_npar = 0;
1689                 vc->vc_state = ESgetpars;
1690                 if (c == '[') { /* Function key */
1691                         vc->vc_state=ESfunckey;
1692                         return;
1693                 }
1694                 vc->vc_ques = (c == '?');
1695                 if (vc->vc_ques)
1696                         return;
1697         case ESgetpars:
1698                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1699                         vc->vc_npar++;
1700                         return;
1701                 } else if (c>='0' && c<='9') {
1702                         vc->vc_par[vc->vc_npar] *= 10;
1703                         vc->vc_par[vc->vc_npar] += c - '0';
1704                         return;
1705                 } else
1706                         vc->vc_state = ESgotpars;
1707         case ESgotpars:
1708                 vc->vc_state = ESnormal;
1709                 switch(c) {
1710                 case 'h':
1711                         set_mode(vc, 1);
1712                         return;
1713                 case 'l':
1714                         set_mode(vc, 0);
1715                         return;
1716                 case 'c':
1717                         if (vc->vc_ques) {
1718                                 if (vc->vc_par[0])
1719                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1720                                 else
1721                                         vc->vc_cursor_type = CUR_DEFAULT;
1722                                 return;
1723                         }
1724                         break;
1725                 case 'm':
1726                         if (vc->vc_ques) {
1727                                 clear_selection();
1728                                 if (vc->vc_par[0])
1729                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1730                                 else
1731                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1732                                 return;
1733                         }
1734                         break;
1735                 case 'n':
1736                         if (!vc->vc_ques) {
1737                                 if (vc->vc_par[0] == 5)
1738                                         status_report(tty);
1739                                 else if (vc->vc_par[0] == 6)
1740                                         cursor_report(vc, tty);
1741                         }
1742                         return;
1743                 }
1744                 if (vc->vc_ques) {
1745                         vc->vc_ques = 0;
1746                         return;
1747                 }
1748                 switch(c) {
1749                 case 'G': case '`':
1750                         if (vc->vc_par[0])
1751                                 vc->vc_par[0]--;
1752                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1753                         return;
1754                 case 'A':
1755                         if (!vc->vc_par[0])
1756                                 vc->vc_par[0]++;
1757                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1758                         return;
1759                 case 'B': case 'e':
1760                         if (!vc->vc_par[0])
1761                                 vc->vc_par[0]++;
1762                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1763                         return;
1764                 case 'C': case 'a':
1765                         if (!vc->vc_par[0])
1766                                 vc->vc_par[0]++;
1767                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1768                         return;
1769                 case 'D':
1770                         if (!vc->vc_par[0])
1771                                 vc->vc_par[0]++;
1772                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1773                         return;
1774                 case 'E':
1775                         if (!vc->vc_par[0])
1776                                 vc->vc_par[0]++;
1777                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1778                         return;
1779                 case 'F':
1780                         if (!vc->vc_par[0])
1781                                 vc->vc_par[0]++;
1782                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1783                         return;
1784                 case 'd':
1785                         if (vc->vc_par[0])
1786                                 vc->vc_par[0]--;
1787                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1788                         return;
1789                 case 'H': case 'f':
1790                         if (vc->vc_par[0])
1791                                 vc->vc_par[0]--;
1792                         if (vc->vc_par[1])
1793                                 vc->vc_par[1]--;
1794                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1795                         return;
1796                 case 'J':
1797                         csi_J(vc, vc->vc_par[0]);
1798                         return;
1799                 case 'K':
1800                         csi_K(vc, vc->vc_par[0]);
1801                         return;
1802                 case 'L':
1803                         csi_L(vc, vc->vc_par[0]);
1804                         return;
1805                 case 'M':
1806                         csi_M(vc, vc->vc_par[0]);
1807                         return;
1808                 case 'P':
1809                         csi_P(vc, vc->vc_par[0]);
1810                         return;
1811                 case 'c':
1812                         if (!vc->vc_par[0])
1813                                 respond_ID(tty);
1814                         return;
1815                 case 'g':
1816                         if (!vc->vc_par[0])
1817                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1818                         else if (vc->vc_par[0] == 3) {
1819                                 vc->vc_tab_stop[0] =
1820                                         vc->vc_tab_stop[1] =
1821                                         vc->vc_tab_stop[2] =
1822                                         vc->vc_tab_stop[3] =
1823                                         vc->vc_tab_stop[4] = 0;
1824                         }
1825                         return;
1826                 case 'm':
1827                         csi_m(vc);
1828                         return;
1829                 case 'q': /* DECLL - but only 3 leds */
1830                         /* map 0,1,2,3 to 0,1,2,4 */
1831                         if (vc->vc_par[0] < 4)
1832                                 setledstate(kbd_table + vc->vc_num,
1833                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1834                         return;
1835                 case 'r':
1836                         if (!vc->vc_par[0])
1837                                 vc->vc_par[0]++;
1838                         if (!vc->vc_par[1])
1839                                 vc->vc_par[1] = vc->vc_rows;
1840                         /* Minimum allowed region is 2 lines */
1841                         if (vc->vc_par[0] < vc->vc_par[1] &&
1842                             vc->vc_par[1] <= vc->vc_rows) {
1843                                 vc->vc_top = vc->vc_par[0] - 1;
1844                                 vc->vc_bottom = vc->vc_par[1];
1845                                 gotoxay(vc, 0, 0);
1846                         }
1847                         return;
1848                 case 's':
1849                         save_cur(vc);
1850                         return;
1851                 case 'u':
1852                         restore_cur(vc);
1853                         return;
1854                 case 'X':
1855                         csi_X(vc, vc->vc_par[0]);
1856                         return;
1857                 case '@':
1858                         csi_at(vc, vc->vc_par[0]);
1859                         return;
1860                 case ']': /* setterm functions */
1861                         setterm_command(vc);
1862                         return;
1863                 }
1864                 return;
1865         case ESpercent:
1866                 vc->vc_state = ESnormal;
1867                 switch (c) {
1868                 case '@':  /* defined in ISO 2022 */
1869                         vc->vc_utf = 0;
1870                         return;
1871                 case 'G':  /* prelim official escape code */
1872                 case '8':  /* retained for compatibility */
1873                         vc->vc_utf = 1;
1874                         return;
1875                 }
1876                 return;
1877         case ESfunckey:
1878                 vc->vc_state = ESnormal;
1879                 return;
1880         case EShash:
1881                 vc->vc_state = ESnormal;
1882                 if (c == '8') {
1883                         /* DEC screen alignment test. kludge :-) */
1884                         vc->vc_video_erase_char =
1885                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1886                         csi_J(vc, 2);
1887                         vc->vc_video_erase_char =
1888                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1889                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1890                 }
1891                 return;
1892         case ESsetG0:
1893                 if (c == '0')
1894                         vc->vc_G0_charset = GRAF_MAP;
1895                 else if (c == 'B')
1896                         vc->vc_G0_charset = LAT1_MAP;
1897                 else if (c == 'U')
1898                         vc->vc_G0_charset = IBMPC_MAP;
1899                 else if (c == 'K')
1900                         vc->vc_G0_charset = USER_MAP;
1901                 if (vc->vc_charset == 0)
1902                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1903                 vc->vc_state = ESnormal;
1904                 return;
1905         case ESsetG1:
1906                 if (c == '0')
1907                         vc->vc_G1_charset = GRAF_MAP;
1908                 else if (c == 'B')
1909                         vc->vc_G1_charset = LAT1_MAP;
1910                 else if (c == 'U')
1911                         vc->vc_G1_charset = IBMPC_MAP;
1912                 else if (c == 'K')
1913                         vc->vc_G1_charset = USER_MAP;
1914                 if (vc->vc_charset == 1)
1915                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1916                 vc->vc_state = ESnormal;
1917                 return;
1918         default:
1919                 vc->vc_state = ESnormal;
1920         }
1921 }
1922
1923 /* This is a temporary buffer used to prepare a tty console write
1924  * so that we can easily avoid touching user space while holding the
1925  * console spinlock.  It is allocated in con_init and is shared by
1926  * this code and the vc_screen read/write tty calls.
1927  *
1928  * We have to allocate this statically in the kernel data section
1929  * since console_init (and thus con_init) are called before any
1930  * kernel memory allocation is available.
1931  */
1932 char con_buf[CON_BUF_SIZE];
1933 DECLARE_MUTEX(con_buf_sem);
1934
1935 /* is_double_width() is based on the wcwidth() implementation by
1936  * Markus Kuhn -- 2003-05-20 (Unicode 4.0)
1937  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
1938  */
1939 struct interval {
1940         uint32_t first;
1941         uint32_t last;
1942 };
1943
1944 static int bisearch(uint32_t ucs, const struct interval *table, int max)
1945 {
1946         int min = 0;
1947         int mid;
1948
1949         if (ucs < table[0].first || ucs > table[max].last)
1950                 return 0;
1951         while (max >= min) {
1952                 mid = (min + max) / 2;
1953                 if (ucs > table[mid].last)
1954                         min = mid + 1;
1955                 else if (ucs < table[mid].first)
1956                         max = mid - 1;
1957                 else
1958                         return 1;
1959         }
1960         return 0;
1961 }
1962
1963 static int is_double_width(uint32_t ucs)
1964 {
1965         static const struct interval double_width[] = {
1966                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
1967                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1968                 { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, { 0xFFE0, 0xFFE6 },
1969                 { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
1970         };
1971         return bisearch(ucs, double_width,
1972                 sizeof(double_width) / sizeof(*double_width) - 1);
1973 }
1974
1975 /* acquires console_sem */
1976 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1977 {
1978 #ifdef VT_BUF_VRAM_ONLY
1979 #define FLUSH do { } while(0);
1980 #else
1981 #define FLUSH if (draw_x >= 0) { \
1982         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1983         draw_x = -1; \
1984         }
1985 #endif
1986
1987         int c, tc, ok, n = 0, draw_x = -1;
1988         unsigned int currcons;
1989         unsigned long draw_from = 0, draw_to = 0;
1990         struct vc_data *vc;
1991         unsigned char vc_attr;
1992         uint8_t rescan;
1993         uint8_t inverse;
1994         uint8_t width;
1995         u16 himask, charmask;
1996         const unsigned char *orig_buf = NULL;
1997         int orig_count;
1998
1999         if (in_interrupt())
2000                 return count;
2001
2002         might_sleep();
2003
2004         acquire_console_sem();
2005         vc = tty->driver_data;
2006         if (vc == NULL) {
2007                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2008                 release_console_sem();
2009                 return 0;
2010         }
2011
2012         currcons = vc->vc_num;
2013         if (!vc_cons_allocated(currcons)) {
2014             /* could this happen? */
2015             static int error = 0;
2016             if (!error) {
2017                 error = 1;
2018                 printk("con_write: tty %d not allocated\n", currcons+1);
2019             }
2020             release_console_sem();
2021             return 0;
2022         }
2023         release_console_sem();
2024
2025         orig_buf = buf;
2026         orig_count = count;
2027
2028         /* At this point 'buf' is guaranteed to be a kernel buffer
2029          * and therefore no access to userspace (and therefore sleeping)
2030          * will be needed.  The con_buf_sem serializes all tty based
2031          * console rendering and vcs write/read operations.  We hold
2032          * the console spinlock during the entire write.
2033          */
2034
2035         acquire_console_sem();
2036
2037         vc = tty->driver_data;
2038         if (vc == NULL) {
2039                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2040                 release_console_sem();
2041                 goto out;
2042         }
2043
2044         himask = vc->vc_hi_font_mask;
2045         charmask = himask ? 0x1ff : 0xff;
2046
2047         /* undraw cursor first */
2048         if (IS_FG(vc))
2049                 hide_cursor(vc);
2050
2051         while (!tty->stopped && count) {
2052                 int orig = *buf;
2053                 c = orig;
2054                 buf++;
2055                 n++;
2056                 count--;
2057                 rescan = 0;
2058                 inverse = 0;
2059                 width = 1;
2060
2061                 /* Do no translation at all in control states */
2062                 if (vc->vc_state != ESnormal) {
2063                         tc = c;
2064                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2065                     /* Combine UTF-8 into Unicode in vc_utf_char.
2066                      * vc_utf_count is the number of continuation bytes still
2067                      * expected to arrive.
2068                      * vc_npar is the number of continuation bytes arrived so
2069                      * far
2070                      */
2071 rescan_last_byte:
2072                     if ((c & 0xc0) == 0x80) {
2073                         /* Continuation byte received */
2074                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2075                         if (vc->vc_utf_count) {
2076                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2077                             vc->vc_npar++;
2078                             if (--vc->vc_utf_count) {
2079                                 /* Still need some bytes */
2080                                 continue;
2081                             }
2082                             /* Got a whole character */
2083                             c = vc->vc_utf_char;
2084                             /* Reject overlong sequences */
2085                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2086                                         c > utf8_length_changes[vc->vc_npar])
2087                                 c = 0xfffd;
2088                         } else {
2089                             /* Unexpected continuation byte */
2090                             vc->vc_utf_count = 0;
2091                             c = 0xfffd;
2092                         }
2093                     } else {
2094                         /* Single ASCII byte or first byte of a sequence received */
2095                         if (vc->vc_utf_count) {
2096                             /* Continuation byte expected */
2097                             rescan = 1;
2098                             vc->vc_utf_count = 0;
2099                             c = 0xfffd;
2100                         } else if (c > 0x7f) {
2101                             /* First byte of a multibyte sequence received */
2102                             vc->vc_npar = 0;
2103                             if ((c & 0xe0) == 0xc0) {
2104                                 vc->vc_utf_count = 1;
2105                                 vc->vc_utf_char = (c & 0x1f);
2106                             } else if ((c & 0xf0) == 0xe0) {
2107                                 vc->vc_utf_count = 2;
2108                                 vc->vc_utf_char = (c & 0x0f);
2109                             } else if ((c & 0xf8) == 0xf0) {
2110                                 vc->vc_utf_count = 3;
2111                                 vc->vc_utf_char = (c & 0x07);
2112                             } else if ((c & 0xfc) == 0xf8) {
2113                                 vc->vc_utf_count = 4;
2114                                 vc->vc_utf_char = (c & 0x03);
2115                             } else if ((c & 0xfe) == 0xfc) {
2116                                 vc->vc_utf_count = 5;
2117                                 vc->vc_utf_char = (c & 0x01);
2118                             } else {
2119                                 /* 254 and 255 are invalid */
2120                                 c = 0xfffd;
2121                             }
2122                             if (vc->vc_utf_count) {
2123                                 /* Still need some bytes */
2124                                 continue;
2125                             }
2126                         }
2127                         /* Nothing to do if an ASCII byte was received */
2128                     }
2129                     /* End of UTF-8 decoding. */
2130                     /* c is the received character, or U+FFFD for invalid sequences. */
2131                     /* Replace invalid Unicode code points with U+FFFD too */
2132                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2133                         c = 0xfffd;
2134                     tc = c;
2135                 } else {        /* no utf or alternate charset mode */
2136                     tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2137                 }
2138
2139                 /* If the original code was a control character we
2140                  * only allow a glyph to be displayed if the code is
2141                  * not normally used (such as for cursor movement) or
2142                  * if the disp_ctrl mode has been explicitly enabled.
2143                  * Certain characters (as given by the CTRL_ALWAYS
2144                  * bitmap) are always displayed as control characters,
2145                  * as the console would be pretty useless without
2146                  * them; to display an arbitrary font position use the
2147                  * direct-to-font zone in UTF-8 mode.
2148                  */
2149                 ok = tc && (c >= 32 ||
2150                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2151                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2152                         && (c != 127 || vc->vc_disp_ctrl)
2153                         && (c != 128+27);
2154
2155                 if (vc->vc_state == ESnormal && ok) {
2156                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2157                                 if (is_double_width(c))
2158                                         width = 2;
2159                         }
2160                         /* Now try to find out how to display it */
2161                         tc = conv_uni_to_pc(vc, tc);
2162                         if (tc & ~charmask) {
2163                                 if (tc == -1 || tc == -2) {
2164                                     continue; /* nothing to display */
2165                                 }
2166                                 /* Glyph not found */
2167                                 if (!(vc->vc_utf && !vc->vc_disp_ctrl) && !(c & ~charmask)) {
2168                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2169                                        This would make absolutely no sense with Unicode in mind. */
2170                                     tc = c;
2171                                 } else {
2172                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2173                                     tc = conv_uni_to_pc(vc, 0xfffd);
2174                                     if (tc < 0) {
2175                                         inverse = 1;
2176                                         tc = conv_uni_to_pc(vc, '?');
2177                                         if (tc < 0) tc = '?';
2178                                     }
2179                                 }
2180                         }
2181
2182                         if (!inverse) {
2183                                 vc_attr = vc->vc_attr;
2184                         } else {
2185                                 /* invert vc_attr */
2186                                 if (!vc->vc_can_do_color) {
2187                                         vc_attr = (vc->vc_attr) ^ 0x08;
2188                                 } else if (vc->vc_hi_font_mask == 0x100) {
2189                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2190                                 } else {
2191                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2192                                 }
2193                         }
2194
2195                         while (1) {
2196                                 if (vc->vc_need_wrap || vc->vc_decim)
2197                                         FLUSH
2198                                 if (vc->vc_need_wrap) {
2199                                         cr(vc);
2200                                         lf(vc);
2201                                 }
2202                                 if (vc->vc_decim)
2203                                         insert_char(vc, 1);
2204                                 scr_writew(himask ?
2205                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2206                                              (vc_attr << 8) + tc,
2207                                            (u16 *) vc->vc_pos);
2208                                 if (DO_UPDATE(vc) && draw_x < 0) {
2209                                         draw_x = vc->vc_x;
2210                                         draw_from = vc->vc_pos;
2211                                 }
2212                                 if (vc->vc_x == vc->vc_cols - 1) {
2213                                         vc->vc_need_wrap = vc->vc_decawm;
2214                                         draw_to = vc->vc_pos + 2;
2215                                 } else {
2216                                         vc->vc_x++;
2217                                         draw_to = (vc->vc_pos += 2);
2218                                 }
2219
2220                                 if (!--width) break;
2221
2222                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2223                                 if (tc < 0) tc = ' ';
2224                         }
2225
2226                         if (rescan) {
2227                                 rescan = 0;
2228                                 inverse = 0;
2229                                 width = 1;
2230                                 c = orig;
2231                                 goto rescan_last_byte;
2232                         }
2233                         continue;
2234                 }
2235                 FLUSH
2236                 do_con_trol(tty, vc, orig);
2237         }
2238         FLUSH
2239         console_conditional_schedule();
2240         release_console_sem();
2241
2242 out:
2243         return n;
2244 #undef FLUSH
2245 }
2246
2247 /*
2248  * This is the console switching callback.
2249  *
2250  * Doing console switching in a process context allows
2251  * us to do the switches asynchronously (needed when we want
2252  * to switch due to a keyboard interrupt).  Synchronization
2253  * with other console code and prevention of re-entrancy is
2254  * ensured with console_sem.
2255  */
2256 static void console_callback(struct work_struct *ignored)
2257 {
2258         acquire_console_sem();
2259
2260         if (want_console >= 0) {
2261                 if (want_console != fg_console &&
2262                     vc_cons_allocated(want_console)) {
2263                         hide_cursor(vc_cons[fg_console].d);
2264                         change_console(vc_cons[want_console].d);
2265                         /* we only changed when the console had already
2266                            been allocated - a new console is not created
2267                            in an interrupt routine */
2268                 }
2269                 want_console = -1;
2270         }
2271         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2272                 do_poke_blanked_console = 0;
2273                 poke_blanked_console();
2274         }
2275         if (scrollback_delta) {
2276                 struct vc_data *vc = vc_cons[fg_console].d;
2277                 clear_selection();
2278                 if (vc->vc_mode == KD_TEXT)
2279                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2280                 scrollback_delta = 0;
2281         }
2282         if (blank_timer_expired) {
2283                 do_blank_screen(0);
2284                 blank_timer_expired = 0;
2285         }
2286
2287         release_console_sem();
2288 }
2289
2290 int set_console(int nr)
2291 {
2292         struct vc_data *vc = vc_cons[fg_console].d;
2293
2294         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2295                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2296
2297                 /*
2298                  * Console switch will fail in console_callback() or
2299                  * change_console() so there is no point scheduling
2300                  * the callback
2301                  *
2302                  * Existing set_console() users don't check the return
2303                  * value so this shouldn't break anything
2304                  */
2305                 return -EINVAL;
2306         }
2307
2308         want_console = nr;
2309         schedule_console_callback();
2310
2311         return 0;
2312 }
2313
2314 struct tty_driver *console_driver;
2315
2316 #ifdef CONFIG_VT_CONSOLE
2317
2318 /*
2319  *      Console on virtual terminal
2320  *
2321  * The console must be locked when we get here.
2322  */
2323
2324 static void vt_console_print(struct console *co, const char *b, unsigned count)
2325 {
2326         struct vc_data *vc = vc_cons[fg_console].d;
2327         unsigned char c;
2328         static unsigned long printing;
2329         const ushort *start;
2330         ushort cnt = 0;
2331         ushort myx;
2332
2333         /* console busy or not yet initialized */
2334         if (!printable || test_and_set_bit(0, &printing))
2335                 return;
2336
2337         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2338                 vc = vc_cons[kmsg_redirect - 1].d;
2339
2340         /* read `x' only after setting currcons properly (otherwise
2341            the `x' macro will read the x of the foreground console). */
2342         myx = vc->vc_x;
2343
2344         if (!vc_cons_allocated(fg_console)) {
2345                 /* impossible */
2346                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2347                 goto quit;
2348         }
2349
2350         if (vc->vc_mode != KD_TEXT)
2351                 goto quit;
2352
2353         /* undraw cursor first */
2354         if (IS_FG(vc))
2355                 hide_cursor(vc);
2356
2357         start = (ushort *)vc->vc_pos;
2358
2359         /* Contrived structure to try to emulate original need_wrap behaviour
2360          * Problems caused when we have need_wrap set on '\n' character */
2361         while (count--) {
2362                 c = *b++;
2363                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2364                         if (cnt > 0) {
2365                                 if (CON_IS_VISIBLE(vc))
2366                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2367                                 vc->vc_x += cnt;
2368                                 if (vc->vc_need_wrap)
2369                                         vc->vc_x--;
2370                                 cnt = 0;
2371                         }
2372                         if (c == 8) {           /* backspace */
2373                                 bs(vc);
2374                                 start = (ushort *)vc->vc_pos;
2375                                 myx = vc->vc_x;
2376                                 continue;
2377                         }
2378                         if (c != 13)
2379                                 lf(vc);
2380                         cr(vc);
2381                         start = (ushort *)vc->vc_pos;
2382                         myx = vc->vc_x;
2383                         if (c == 10 || c == 13)
2384                                 continue;
2385                 }
2386                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2387                 cnt++;
2388                 if (myx == vc->vc_cols - 1) {
2389                         vc->vc_need_wrap = 1;
2390                         continue;
2391                 }
2392                 vc->vc_pos += 2;
2393                 myx++;
2394         }
2395         if (cnt > 0) {
2396                 if (CON_IS_VISIBLE(vc))
2397                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2398                 vc->vc_x += cnt;
2399                 if (vc->vc_x == vc->vc_cols) {
2400                         vc->vc_x--;
2401                         vc->vc_need_wrap = 1;
2402                 }
2403         }
2404         set_cursor(vc);
2405
2406 quit:
2407         clear_bit(0, &printing);
2408 }
2409
2410 static struct tty_driver *vt_console_device(struct console *c, int *index)
2411 {
2412         *index = c->index ? c->index-1 : fg_console;
2413         return console_driver;
2414 }
2415
2416 static struct console vt_console_driver = {
2417         .name           = "tty",
2418         .write          = vt_console_print,
2419         .device         = vt_console_device,
2420         .unblank        = unblank_screen,
2421         .flags          = CON_PRINTBUFFER,
2422         .index          = -1,
2423 };
2424 #endif
2425
2426 /*
2427  *      Handling of Linux-specific VC ioctls
2428  */
2429
2430 /*
2431  * Generally a bit racy with respect to console_sem().
2432  *
2433  * There are some functions which don't need it.
2434  *
2435  * There are some functions which can sleep for arbitrary periods
2436  * (paste_selection) but we don't need the lock there anyway.
2437  *
2438  * set_selection has locking, and definitely needs it
2439  */
2440
2441 int tioclinux(struct tty_struct *tty, unsigned long arg)
2442 {
2443         char type, data;
2444         char __user *p = (char __user *)arg;
2445         int lines;
2446         int ret;
2447
2448         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2449                 return -EINVAL;
2450         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2451                 return -EPERM;
2452         if (get_user(type, p))
2453                 return -EFAULT;
2454         ret = 0;
2455         switch (type)
2456         {
2457                 case TIOCL_SETSEL:
2458                         acquire_console_sem();
2459                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2460                         release_console_sem();
2461                         break;
2462                 case TIOCL_PASTESEL:
2463                         ret = paste_selection(tty);
2464                         break;
2465                 case TIOCL_UNBLANKSCREEN:
2466                         acquire_console_sem();
2467                         unblank_screen();
2468                         release_console_sem();
2469                         break;
2470                 case TIOCL_SELLOADLUT:
2471                         ret = sel_loadlut(p);
2472                         break;
2473                 case TIOCL_GETSHIFTSTATE:
2474
2475         /*
2476          * Make it possible to react to Shift+Mousebutton.
2477          * Note that 'shift_state' is an undocumented
2478          * kernel-internal variable; programs not closely
2479          * related to the kernel should not use this.
2480          */
2481                         data = shift_state;
2482                         ret = __put_user(data, p);
2483                         break;
2484                 case TIOCL_GETMOUSEREPORTING:
2485                         data = mouse_reporting();
2486                         ret = __put_user(data, p);
2487                         break;
2488                 case TIOCL_SETVESABLANK:
2489                         ret = set_vesa_blanking(p);
2490                         break;
2491                 case TIOCL_GETKMSGREDIRECT:
2492                         data = kmsg_redirect;
2493                         ret = __put_user(data, p);
2494                         break;
2495                 case TIOCL_SETKMSGREDIRECT:
2496                         if (!capable(CAP_SYS_ADMIN)) {
2497                                 ret = -EPERM;
2498                         } else {
2499                                 if (get_user(data, p+1))
2500                                         ret = -EFAULT;
2501                                 else
2502                                         kmsg_redirect = data;
2503                         }
2504                         break;
2505                 case TIOCL_GETFGCONSOLE:
2506                         ret = fg_console;
2507                         break;
2508                 case TIOCL_SCROLLCONSOLE:
2509                         if (get_user(lines, (s32 __user *)(p+4))) {
2510                                 ret = -EFAULT;
2511                         } else {
2512                                 scrollfront(vc_cons[fg_console].d, lines);
2513                                 ret = 0;
2514                         }
2515                         break;
2516                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2517                         acquire_console_sem();
2518                         ignore_poke = 1;
2519                         do_blank_screen(0);
2520                         release_console_sem();
2521                         break;
2522                 case TIOCL_BLANKEDSCREEN:
2523                         ret = console_blanked;
2524                         break;
2525                 default:
2526                         ret = -EINVAL;
2527                         break;
2528         }
2529         return ret;
2530 }
2531
2532 /*
2533  * /dev/ttyN handling
2534  */
2535
2536 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2537 {
2538         int     retval;
2539
2540         retval = do_con_write(tty, buf, count);
2541         con_flush_chars(tty);
2542
2543         return retval;
2544 }
2545
2546 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2547 {
2548         if (in_interrupt())
2549                 return; /* n_r3964 calls put_char() from interrupt context */
2550         do_con_write(tty, &ch, 1);
2551 }
2552
2553 static int con_write_room(struct tty_struct *tty)
2554 {
2555         if (tty->stopped)
2556                 return 0;
2557         return 4096;            /* No limit, really; we're not buffering */
2558 }
2559
2560 static int con_chars_in_buffer(struct tty_struct *tty)
2561 {
2562         return 0;               /* we're not buffering */
2563 }
2564
2565 /*
2566  * con_throttle and con_unthrottle are only used for
2567  * paste_selection(), which has to stuff in a large number of
2568  * characters...
2569  */
2570 static void con_throttle(struct tty_struct *tty)
2571 {
2572 }
2573
2574 static void con_unthrottle(struct tty_struct *tty)
2575 {
2576         struct vc_data *vc = tty->driver_data;
2577
2578         wake_up_interruptible(&vc->paste_wait);
2579 }
2580
2581 /*
2582  * Turn the Scroll-Lock LED on when the tty is stopped
2583  */
2584 static void con_stop(struct tty_struct *tty)
2585 {
2586         int console_num;
2587         if (!tty)
2588                 return;
2589         console_num = tty->index;
2590         if (!vc_cons_allocated(console_num))
2591                 return;
2592         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2593         set_leds();
2594 }
2595
2596 /*
2597  * Turn the Scroll-Lock LED off when the console is started
2598  */
2599 static void con_start(struct tty_struct *tty)
2600 {
2601         int console_num;
2602         if (!tty)
2603                 return;
2604         console_num = tty->index;
2605         if (!vc_cons_allocated(console_num))
2606                 return;
2607         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2608         set_leds();
2609 }
2610
2611 static void con_flush_chars(struct tty_struct *tty)
2612 {
2613         struct vc_data *vc;
2614
2615         if (in_interrupt())     /* from flush_to_ldisc */
2616                 return;
2617
2618         /* if we race with con_close(), vt may be null */
2619         acquire_console_sem();
2620         vc = tty->driver_data;
2621         if (vc)
2622                 set_cursor(vc);
2623         release_console_sem();
2624 }
2625
2626 /*
2627  * Allocate the console screen memory.
2628  */
2629 static int con_open(struct tty_struct *tty, struct file *filp)
2630 {
2631         unsigned int currcons = tty->index;
2632         int ret = 0;
2633
2634         acquire_console_sem();
2635         if (tty->driver_data == NULL) {
2636                 ret = vc_allocate(currcons);
2637                 if (ret == 0) {
2638                         struct vc_data *vc = vc_cons[currcons].d;
2639                         tty->driver_data = vc;
2640                         vc->vc_tty = tty;
2641
2642                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2643                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2644                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2645                         }
2646                         release_console_sem();
2647                         vcs_make_sysfs(tty);
2648                         return ret;
2649                 }
2650         }
2651         release_console_sem();
2652         return ret;
2653 }
2654
2655 /*
2656  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2657  * and taking a ref against the tty while we're in the process of forgetting
2658  * about it and cleaning things up.
2659  *
2660  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2661  */
2662 static void con_close(struct tty_struct *tty, struct file *filp)
2663 {
2664         mutex_lock(&tty_mutex);
2665         acquire_console_sem();
2666         if (tty && tty->count == 1) {
2667                 struct vc_data *vc = tty->driver_data;
2668
2669                 if (vc)
2670                         vc->vc_tty = NULL;
2671                 tty->driver_data = NULL;
2672                 release_console_sem();
2673                 vcs_remove_sysfs(tty);
2674                 mutex_unlock(&tty_mutex);
2675                 /*
2676                  * tty_mutex is released, but we still hold BKL, so there is
2677                  * still exclusion against init_dev()
2678                  */
2679                 return;
2680         }
2681         release_console_sem();
2682         mutex_unlock(&tty_mutex);
2683 }
2684
2685 static void vc_init(struct vc_data *vc, unsigned int rows,
2686                     unsigned int cols, int do_clear)
2687 {
2688         int j, k ;
2689
2690         vc->vc_cols = cols;
2691         vc->vc_rows = rows;
2692         vc->vc_size_row = cols << 1;
2693         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2694
2695         set_origin(vc);
2696         vc->vc_pos = vc->vc_origin;
2697         reset_vc(vc);
2698         for (j=k=0; j<16; j++) {
2699                 vc->vc_palette[k++] = default_red[j] ;
2700                 vc->vc_palette[k++] = default_grn[j] ;
2701                 vc->vc_palette[k++] = default_blu[j] ;
2702         }
2703         vc->vc_def_color       = 0x07;   /* white */
2704         vc->vc_ulcolor          = 0x0f;   /* bold white */
2705         vc->vc_halfcolor       = 0x08;   /* grey */
2706         init_waitqueue_head(&vc->paste_wait);
2707         reset_terminal(vc, do_clear);
2708 }
2709
2710 /*
2711  * This routine initializes console interrupts, and does nothing
2712  * else. If you want the screen to clear, call tty_write with
2713  * the appropriate escape-sequence.
2714  */
2715
2716 static int __init con_init(void)
2717 {
2718         const char *display_desc = NULL;
2719         struct vc_data *vc;
2720         unsigned int currcons = 0, i;
2721
2722         acquire_console_sem();
2723
2724         if (conswitchp)
2725                 display_desc = conswitchp->con_startup();
2726         if (!display_desc) {
2727                 fg_console = 0;
2728                 release_console_sem();
2729                 return 0;
2730         }
2731
2732         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2733                 struct con_driver *con_driver = &registered_con_driver[i];
2734
2735                 if (con_driver->con == NULL) {
2736                         con_driver->con = conswitchp;
2737                         con_driver->desc = display_desc;
2738                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2739                         con_driver->first = 0;
2740                         con_driver->last = MAX_NR_CONSOLES - 1;
2741                         break;
2742                 }
2743         }
2744
2745         for (i = 0; i < MAX_NR_CONSOLES; i++)
2746                 con_driver_map[i] = conswitchp;
2747
2748         if (blankinterval) {
2749                 blank_state = blank_normal_wait;
2750                 mod_timer(&console_timer, jiffies + blankinterval);
2751         }
2752
2753         /*
2754          * kmalloc is not running yet - we use the bootmem allocator.
2755          */
2756         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2757                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2758                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2759                 visual_init(vc, currcons, 1);
2760                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2761                 vc->vc_kmalloced = 0;
2762                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2763                         currcons || !vc->vc_sw->con_save_screen);
2764         }
2765         currcons = fg_console = 0;
2766         master_display_fg = vc = vc_cons[currcons].d;
2767         set_origin(vc);
2768         save_screen(vc);
2769         gotoxy(vc, vc->vc_x, vc->vc_y);
2770         csi_J(vc, 0);
2771         update_screen(vc);
2772         printk("Console: %s %s %dx%d",
2773                 vc->vc_can_do_color ? "colour" : "mono",
2774                 display_desc, vc->vc_cols, vc->vc_rows);
2775         printable = 1;
2776         printk("\n");
2777
2778         release_console_sem();
2779
2780 #ifdef CONFIG_VT_CONSOLE
2781         register_console(&vt_console_driver);
2782 #endif
2783         return 0;
2784 }
2785 console_initcall(con_init);
2786
2787 static const struct tty_operations con_ops = {
2788         .open = con_open,
2789         .close = con_close,
2790         .write = con_write,
2791         .write_room = con_write_room,
2792         .put_char = con_put_char,
2793         .flush_chars = con_flush_chars,
2794         .chars_in_buffer = con_chars_in_buffer,
2795         .ioctl = vt_ioctl,
2796         .stop = con_stop,
2797         .start = con_start,
2798         .throttle = con_throttle,
2799         .unthrottle = con_unthrottle,
2800 };
2801
2802 int __init vty_init(void)
2803 {
2804         vcs_init();
2805
2806         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2807         if (!console_driver)
2808                 panic("Couldn't allocate console driver\n");
2809         console_driver->owner = THIS_MODULE;
2810         console_driver->name = "tty";
2811         console_driver->name_base = 1;
2812         console_driver->major = TTY_MAJOR;
2813         console_driver->minor_start = 1;
2814         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2815         console_driver->init_termios = tty_std_termios;
2816         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2817         tty_set_operations(console_driver, &con_ops);
2818         if (tty_register_driver(console_driver))
2819                 panic("Couldn't register console driver\n");
2820
2821         kbd_init();
2822         console_map_init();
2823 #ifdef CONFIG_PROM_CONSOLE
2824         prom_con_init();
2825 #endif
2826 #ifdef CONFIG_MDA_CONSOLE
2827         mda_console_init();
2828 #endif
2829         return 0;
2830 }
2831
2832 #ifndef VT_SINGLE_DRIVER
2833 #include <linux/device.h>
2834
2835 static struct class *vtconsole_class;
2836
2837 static int bind_con_driver(const struct consw *csw, int first, int last,
2838                            int deflt)
2839 {
2840         struct module *owner = csw->owner;
2841         const char *desc = NULL;
2842         struct con_driver *con_driver;
2843         int i, j = -1, k = -1, retval = -ENODEV;
2844
2845         if (!try_module_get(owner))
2846                 return -ENODEV;
2847
2848         acquire_console_sem();
2849
2850         /* check if driver is registered */
2851         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2852                 con_driver = &registered_con_driver[i];
2853
2854                 if (con_driver->con == csw) {
2855                         desc = con_driver->desc;
2856                         retval = 0;
2857                         break;
2858                 }
2859         }
2860
2861         if (retval)
2862                 goto err;
2863
2864         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2865                 csw->con_startup();
2866                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2867         }
2868
2869         if (deflt) {
2870                 if (conswitchp)
2871                         module_put(conswitchp->owner);
2872
2873                 __module_get(owner);
2874                 conswitchp = csw;
2875         }
2876
2877         first = max(first, con_driver->first);
2878         last = min(last, con_driver->last);
2879
2880         for (i = first; i <= last; i++) {
2881                 int old_was_color;
2882                 struct vc_data *vc = vc_cons[i].d;
2883
2884                 if (con_driver_map[i])
2885                         module_put(con_driver_map[i]->owner);
2886                 __module_get(owner);
2887                 con_driver_map[i] = csw;
2888
2889                 if (!vc || !vc->vc_sw)
2890                         continue;
2891
2892                 j = i;
2893
2894                 if (CON_IS_VISIBLE(vc)) {
2895                         k = i;
2896                         save_screen(vc);
2897                 }
2898
2899                 old_was_color = vc->vc_can_do_color;
2900                 vc->vc_sw->con_deinit(vc);
2901                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2902                 visual_init(vc, i, 0);
2903                 set_origin(vc);
2904                 update_attr(vc);
2905
2906                 /* If the console changed between mono <-> color, then
2907                  * the attributes in the screenbuf will be wrong.  The
2908                  * following resets all attributes to something sane.
2909                  */
2910                 if (old_was_color != vc->vc_can_do_color)
2911                         clear_buffer_attributes(vc);
2912         }
2913
2914         printk("Console: switching ");
2915         if (!deflt)
2916                 printk("consoles %d-%d ", first+1, last+1);
2917         if (j >= 0) {
2918                 struct vc_data *vc = vc_cons[j].d;
2919
2920                 printk("to %s %s %dx%d\n",
2921                        vc->vc_can_do_color ? "colour" : "mono",
2922                        desc, vc->vc_cols, vc->vc_rows);
2923
2924                 if (k >= 0) {
2925                         vc = vc_cons[k].d;
2926                         update_screen(vc);
2927                 }
2928         } else
2929                 printk("to %s\n", desc);
2930
2931         retval = 0;
2932 err:
2933         release_console_sem();
2934         module_put(owner);
2935         return retval;
2936 };
2937
2938 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2939 static int con_is_graphics(const struct consw *csw, int first, int last)
2940 {
2941         int i, retval = 0;
2942
2943         for (i = first; i <= last; i++) {
2944                 struct vc_data *vc = vc_cons[i].d;
2945
2946                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2947                         retval = 1;
2948                         break;
2949                 }
2950         }
2951
2952         return retval;
2953 }
2954
2955 static int unbind_con_driver(const struct consw *csw, int first, int last,
2956                              int deflt)
2957 {
2958         struct module *owner = csw->owner;
2959         const struct consw *defcsw = NULL;
2960         struct con_driver *con_driver = NULL, *con_back = NULL;
2961         int i, retval = -ENODEV;
2962
2963         if (!try_module_get(owner))
2964                 return -ENODEV;
2965
2966         acquire_console_sem();
2967
2968         /* check if driver is registered and if it is unbindable */
2969         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2970                 con_driver = &registered_con_driver[i];
2971
2972                 if (con_driver->con == csw &&
2973                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2974                         retval = 0;
2975                         break;
2976                 }
2977         }
2978
2979         if (retval) {
2980                 release_console_sem();
2981                 goto err;
2982         }
2983
2984         retval = -ENODEV;
2985
2986         /* check if backup driver exists */
2987         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2988                 con_back = &registered_con_driver[i];
2989
2990                 if (con_back->con &&
2991                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2992                         defcsw = con_back->con;
2993                         retval = 0;
2994                         break;
2995                 }
2996         }
2997
2998         if (retval) {
2999                 release_console_sem();
3000                 goto err;
3001         }
3002
3003         if (!con_is_bound(csw)) {
3004                 release_console_sem();
3005                 goto err;
3006         }
3007
3008         first = max(first, con_driver->first);
3009         last = min(last, con_driver->last);
3010
3011         for (i = first; i <= last; i++) {
3012                 if (con_driver_map[i] == csw) {
3013                         module_put(csw->owner);
3014                         con_driver_map[i] = NULL;
3015                 }
3016         }
3017
3018         if (!con_is_bound(defcsw)) {
3019                 const struct consw *defconsw = conswitchp;
3020
3021                 defcsw->con_startup();
3022                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3023                 /*
3024                  * vgacon may change the default driver to point
3025                  * to dummycon, we restore it here...
3026                  */
3027                 conswitchp = defconsw;
3028         }
3029
3030         if (!con_is_bound(csw))
3031                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3032
3033         release_console_sem();
3034         /* ignore return value, binding should not fail */
3035         bind_con_driver(defcsw, first, last, deflt);
3036 err:
3037         module_put(owner);
3038         return retval;
3039
3040 }
3041
3042 static int vt_bind(struct con_driver *con)
3043 {
3044         const struct consw *defcsw = NULL, *csw = NULL;
3045         int i, more = 1, first = -1, last = -1, deflt = 0;
3046
3047         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3048             con_is_graphics(con->con, con->first, con->last))
3049                 goto err;
3050
3051         csw = con->con;
3052
3053         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3054                 struct con_driver *con = &registered_con_driver[i];
3055
3056                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3057                         defcsw = con->con;
3058                         break;
3059                 }
3060         }
3061
3062         if (!defcsw)
3063                 goto err;
3064
3065         while (more) {
3066                 more = 0;
3067
3068                 for (i = con->first; i <= con->last; i++) {
3069                         if (con_driver_map[i] == defcsw) {
3070                                 if (first == -1)
3071                                         first = i;
3072                                 last = i;
3073                                 more = 1;
3074                         } else if (first != -1)
3075                                 break;
3076                 }
3077
3078                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3079                         deflt = 1;
3080
3081                 if (first != -1)
3082                         bind_con_driver(csw, first, last, deflt);
3083
3084                 first = -1;
3085                 last = -1;
3086                 deflt = 0;
3087         }
3088
3089 err:
3090         return 0;
3091 }
3092
3093 static int vt_unbind(struct con_driver *con)
3094 {
3095         const struct consw *csw = NULL;
3096         int i, more = 1, first = -1, last = -1, deflt = 0;
3097
3098         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3099             con_is_graphics(con->con, con->first, con->last))
3100                 goto err;
3101
3102         csw = con->con;
3103
3104         while (more) {
3105                 more = 0;
3106
3107                 for (i = con->first; i <= con->last; i++) {
3108                         if (con_driver_map[i] == csw) {
3109                                 if (first == -1)
3110                                         first = i;
3111                                 last = i;
3112                                 more = 1;
3113                         } else if (first != -1)
3114                                 break;
3115                 }
3116
3117                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3118                         deflt = 1;
3119
3120                 if (first != -1)
3121                         unbind_con_driver(csw, first, last, deflt);
3122
3123                 first = -1;
3124                 last = -1;
3125                 deflt = 0;
3126         }
3127
3128 err:
3129         return 0;
3130 }
3131 #else
3132 static inline int vt_bind(struct con_driver *con)
3133 {
3134         return 0;
3135 }
3136 static inline int vt_unbind(struct con_driver *con)
3137 {
3138         return 0;
3139 }
3140 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3141
3142 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3143                           const char *buf, size_t count)
3144 {
3145         struct con_driver *con = dev_get_drvdata(dev);
3146         int bind = simple_strtoul(buf, NULL, 0);
3147
3148         if (bind)
3149                 vt_bind(con);
3150         else
3151                 vt_unbind(con);
3152
3153         return count;
3154 }
3155
3156 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3157                          char *buf)
3158 {
3159         struct con_driver *con = dev_get_drvdata(dev);
3160         int bind = con_is_bound(con->con);
3161
3162         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3163 }
3164
3165 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3166                          char *buf)
3167 {
3168         struct con_driver *con = dev_get_drvdata(dev);
3169
3170         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3171                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3172                          con->desc);
3173
3174 }
3175
3176 static struct device_attribute device_attrs[] = {
3177         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3178         __ATTR(name, S_IRUGO, show_name, NULL),
3179 };
3180
3181 static int vtconsole_init_device(struct con_driver *con)
3182 {
3183         int i;
3184         int error = 0;
3185
3186         con->flag |= CON_DRIVER_FLAG_ATTR;
3187         dev_set_drvdata(con->dev, con);
3188         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3189                 error = device_create_file(con->dev, &device_attrs[i]);
3190                 if (error)
3191                         break;
3192         }
3193
3194         if (error) {
3195                 while (--i >= 0)
3196                         device_remove_file(con->dev, &device_attrs[i]);
3197                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3198         }
3199
3200         return error;
3201 }
3202
3203 static void vtconsole_deinit_device(struct con_driver *con)
3204 {
3205         int i;
3206
3207         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3208                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3209                         device_remove_file(con->dev, &device_attrs[i]);
3210                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3211         }
3212 }
3213
3214 /**
3215  * con_is_bound - checks if driver is bound to the console
3216  * @csw: console driver
3217  *
3218  * RETURNS: zero if unbound, nonzero if bound
3219  *
3220  * Drivers can call this and if zero, they should release
3221  * all resources allocated on con_startup()
3222  */
3223 int con_is_bound(const struct consw *csw)
3224 {
3225         int i, bound = 0;
3226
3227         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3228                 if (con_driver_map[i] == csw) {
3229                         bound = 1;
3230                         break;
3231                 }
3232         }
3233
3234         return bound;
3235 }
3236 EXPORT_SYMBOL(con_is_bound);
3237
3238 /**
3239  * register_con_driver - register console driver to console layer
3240  * @csw: console driver
3241  * @first: the first console to take over, minimum value is 0
3242  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3243  *
3244  * DESCRIPTION: This function registers a console driver which can later
3245  * bind to a range of consoles specified by @first and @last. It will
3246  * also initialize the console driver by calling con_startup().
3247  */
3248 int register_con_driver(const struct consw *csw, int first, int last)
3249 {
3250         struct module *owner = csw->owner;
3251         struct con_driver *con_driver;
3252         const char *desc;
3253         int i, retval = 0;
3254
3255         if (!try_module_get(owner))
3256                 return -ENODEV;
3257
3258         acquire_console_sem();
3259
3260         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3261                 con_driver = &registered_con_driver[i];
3262
3263                 /* already registered */
3264                 if (con_driver->con == csw)
3265                         retval = -EINVAL;
3266         }
3267
3268         if (retval)
3269                 goto err;
3270
3271         desc = csw->con_startup();
3272
3273         if (!desc)
3274                 goto err;
3275
3276         retval = -EINVAL;
3277
3278         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3279                 con_driver = &registered_con_driver[i];
3280
3281                 if (con_driver->con == NULL) {
3282                         con_driver->con = csw;
3283                         con_driver->desc = desc;
3284                         con_driver->node = i;
3285                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3286                                            CON_DRIVER_FLAG_INIT;
3287                         con_driver->first = first;
3288                         con_driver->last = last;
3289                         retval = 0;
3290                         break;
3291                 }
3292         }
3293
3294         if (retval)
3295                 goto err;
3296
3297         con_driver->dev = device_create(vtconsole_class, NULL,
3298                                         MKDEV(0, con_driver->node),
3299                                         "vtcon%i", con_driver->node);
3300
3301         if (IS_ERR(con_driver->dev)) {
3302                 printk(KERN_WARNING "Unable to create device for %s; "
3303                        "errno = %ld\n", con_driver->desc,
3304                        PTR_ERR(con_driver->dev));
3305                 con_driver->dev = NULL;
3306         } else {
3307                 vtconsole_init_device(con_driver);
3308         }
3309
3310 err:
3311         release_console_sem();
3312         module_put(owner);
3313         return retval;
3314 }
3315 EXPORT_SYMBOL(register_con_driver);
3316
3317 /**
3318  * unregister_con_driver - unregister console driver from console layer
3319  * @csw: console driver
3320  *
3321  * DESCRIPTION: All drivers that registers to the console layer must
3322  * call this function upon exit, or if the console driver is in a state
3323  * where it won't be able to handle console services, such as the
3324  * framebuffer console without loaded framebuffer drivers.
3325  *
3326  * The driver must unbind first prior to unregistration.
3327  */
3328 int unregister_con_driver(const struct consw *csw)
3329 {
3330         int i, retval = -ENODEV;
3331
3332         acquire_console_sem();
3333
3334         /* cannot unregister a bound driver */
3335         if (con_is_bound(csw))
3336                 goto err;
3337
3338         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3339                 struct con_driver *con_driver = &registered_con_driver[i];
3340
3341                 if (con_driver->con == csw &&
3342                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3343                         vtconsole_deinit_device(con_driver);
3344                         device_destroy(vtconsole_class,
3345                                        MKDEV(0, con_driver->node));
3346                         con_driver->con = NULL;
3347                         con_driver->desc = NULL;
3348                         con_driver->dev = NULL;
3349                         con_driver->node = 0;
3350                         con_driver->flag = 0;
3351                         con_driver->first = 0;
3352                         con_driver->last = 0;
3353                         retval = 0;
3354                         break;
3355                 }
3356         }
3357 err:
3358         release_console_sem();
3359         return retval;
3360 }
3361 EXPORT_SYMBOL(unregister_con_driver);
3362
3363 /*
3364  *      If we support more console drivers, this function is used
3365  *      when a driver wants to take over some existing consoles
3366  *      and become default driver for newly opened ones.
3367  *
3368  *      take_over_console is basically a register followed by unbind
3369  */
3370 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3371 {
3372         int err;
3373
3374         err = register_con_driver(csw, first, last);
3375
3376         if (!err)
3377                 bind_con_driver(csw, first, last, deflt);
3378
3379         return err;
3380 }
3381
3382 /*
3383  * give_up_console is a wrapper to unregister_con_driver. It will only
3384  * work if driver is fully unbound.
3385  */
3386 void give_up_console(const struct consw *csw)
3387 {
3388         unregister_con_driver(csw);
3389 }
3390
3391 static int __init vtconsole_class_init(void)
3392 {
3393         int i;
3394
3395         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3396         if (IS_ERR(vtconsole_class)) {
3397                 printk(KERN_WARNING "Unable to create vt console class; "
3398                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3399                 vtconsole_class = NULL;
3400         }
3401
3402         /* Add system drivers to sysfs */
3403         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3404                 struct con_driver *con = &registered_con_driver[i];
3405
3406                 if (con->con && !con->dev) {
3407                         con->dev = device_create(vtconsole_class, NULL,
3408                                                  MKDEV(0, con->node),
3409                                                  "vtcon%i", con->node);
3410
3411                         if (IS_ERR(con->dev)) {
3412                                 printk(KERN_WARNING "Unable to create "
3413                                        "device for %s; errno = %ld\n",
3414                                        con->desc, PTR_ERR(con->dev));
3415                                 con->dev = NULL;
3416                         } else {
3417                                 vtconsole_init_device(con);
3418                         }
3419                 }
3420         }
3421
3422         return 0;
3423 }
3424 postcore_initcall(vtconsole_class_init);
3425
3426 #endif
3427
3428 /*
3429  *      Screen blanking
3430  */
3431
3432 static int set_vesa_blanking(char __user *p)
3433 {
3434         unsigned int mode;
3435
3436         if (get_user(mode, p + 1))
3437                 return -EFAULT;
3438
3439         vesa_blank_mode = (mode < 4) ? mode : 0;
3440         return 0;
3441 }
3442
3443 void do_blank_screen(int entering_gfx)
3444 {
3445         struct vc_data *vc = vc_cons[fg_console].d;
3446         int i;
3447
3448         WARN_CONSOLE_UNLOCKED();
3449
3450         if (console_blanked) {
3451                 if (blank_state == blank_vesa_wait) {
3452                         blank_state = blank_off;
3453                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3454                 }
3455                 return;
3456         }
3457         if (blank_state != blank_normal_wait)
3458                 return;
3459         blank_state = blank_off;
3460
3461         /* entering graphics mode? */
3462         if (entering_gfx) {
3463                 hide_cursor(vc);
3464                 save_screen(vc);
3465                 vc->vc_sw->con_blank(vc, -1, 1);
3466                 console_blanked = fg_console + 1;
3467                 set_origin(vc);
3468                 return;
3469         }
3470
3471         /* don't blank graphics */
3472         if (vc->vc_mode != KD_TEXT) {
3473                 console_blanked = fg_console + 1;
3474                 return;
3475         }
3476
3477         hide_cursor(vc);
3478         del_timer_sync(&console_timer);
3479         blank_timer_expired = 0;
3480
3481         save_screen(vc);
3482         /* In case we need to reset origin, blanking hook returns 1 */
3483         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3484         console_blanked = fg_console + 1;
3485         if (i)
3486                 set_origin(vc);
3487
3488         if (console_blank_hook && console_blank_hook(1))
3489                 return;
3490
3491         if (vesa_off_interval && vesa_blank_mode) {
3492                 blank_state = blank_vesa_wait;
3493                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3494         }
3495 }
3496 EXPORT_SYMBOL(do_blank_screen);
3497
3498 /*
3499  * Called by timer as well as from vt_console_driver
3500  */
3501 void do_unblank_screen(int leaving_gfx)
3502 {
3503         struct vc_data *vc;
3504
3505         /* This should now always be called from a "sane" (read: can schedule)
3506          * context for the sake of the low level drivers, except in the special
3507          * case of oops_in_progress
3508          */
3509         if (!oops_in_progress)
3510                 might_sleep();
3511
3512         WARN_CONSOLE_UNLOCKED();
3513
3514         ignore_poke = 0;
3515         if (!console_blanked)
3516                 return;
3517         if (!vc_cons_allocated(fg_console)) {
3518                 /* impossible */
3519                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3520                 return;
3521         }
3522         vc = vc_cons[fg_console].d;
3523         if (vc->vc_mode != KD_TEXT)
3524                 return; /* but leave console_blanked != 0 */
3525
3526         if (blankinterval) {
3527                 mod_timer(&console_timer, jiffies + blankinterval);
3528                 blank_state = blank_normal_wait;
3529         }
3530
3531         console_blanked = 0;
3532         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3533                 /* Low-level driver cannot restore -> do it ourselves */
3534                 update_screen(vc);
3535         if (console_blank_hook)
3536                 console_blank_hook(0);
3537         set_palette(vc);
3538         set_cursor(vc);
3539 }
3540 EXPORT_SYMBOL(do_unblank_screen);
3541
3542 /*
3543  * This is called by the outside world to cause a forced unblank, mostly for
3544  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3545  * call it with 1 as an argument and so force a mode restore... that may kill
3546  * X or at least garbage the screen but would also make the Oops visible...
3547  */
3548 void unblank_screen(void)
3549 {
3550         do_unblank_screen(0);
3551 }
3552
3553 /*
3554  * We defer the timer blanking to work queue so it can take the console mutex
3555  * (console operations can still happen at irq time, but only from printk which
3556  * has the console mutex. Not perfect yet, but better than no locking
3557  */
3558 static void blank_screen_t(unsigned long dummy)
3559 {
3560         if (unlikely(!keventd_up())) {
3561                 mod_timer(&console_timer, jiffies + blankinterval);
3562                 return;
3563         }
3564         blank_timer_expired = 1;
3565         schedule_work(&console_work);
3566 }
3567
3568 void poke_blanked_console(void)
3569 {
3570         WARN_CONSOLE_UNLOCKED();
3571
3572         /* Add this so we quickly catch whoever might call us in a non
3573          * safe context. Nowadays, unblank_screen() isn't to be called in
3574          * atomic contexts and is allowed to schedule (with the special case
3575          * of oops_in_progress, but that isn't of any concern for this
3576          * function. --BenH.
3577          */
3578         might_sleep();
3579
3580         /* This isn't perfectly race free, but a race here would be mostly harmless,
3581          * at worse, we'll do a spurrious blank and it's unlikely
3582          */
3583         del_timer(&console_timer);
3584         blank_timer_expired = 0;
3585
3586         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3587                 return;
3588         if (console_blanked)
3589                 unblank_screen();
3590         else if (blankinterval) {
3591                 mod_timer(&console_timer, jiffies + blankinterval);
3592                 blank_state = blank_normal_wait;
3593         }
3594 }
3595
3596 /*
3597  *      Palettes
3598  */
3599
3600 static void set_palette(struct vc_data *vc)
3601 {
3602         WARN_CONSOLE_UNLOCKED();
3603
3604         if (vc->vc_mode != KD_GRAPHICS)
3605                 vc->vc_sw->con_set_palette(vc, color_table);
3606 }
3607
3608 static int set_get_cmap(unsigned char __user *arg, int set)
3609 {
3610     int i, j, k;
3611
3612     WARN_CONSOLE_UNLOCKED();
3613
3614     for (i = 0; i < 16; i++)
3615         if (set) {
3616             get_user(default_red[i], arg++);
3617             get_user(default_grn[i], arg++);
3618             get_user(default_blu[i], arg++);
3619         } else {
3620             put_user(default_red[i], arg++);
3621             put_user(default_grn[i], arg++);
3622             put_user(default_blu[i], arg++);
3623         }
3624     if (set) {
3625         for (i = 0; i < MAX_NR_CONSOLES; i++)
3626             if (vc_cons_allocated(i)) {
3627                 for (j = k = 0; j < 16; j++) {
3628                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3629                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3630                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3631                 }
3632                 set_palette(vc_cons[i].d);
3633             }
3634     }
3635     return 0;
3636 }
3637
3638 /*
3639  * Load palette into the DAC registers. arg points to a colour
3640  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3641  */
3642
3643 int con_set_cmap(unsigned char __user *arg)
3644 {
3645         int rc;
3646
3647         acquire_console_sem();
3648         rc = set_get_cmap (arg,1);
3649         release_console_sem();
3650
3651         return rc;
3652 }
3653
3654 int con_get_cmap(unsigned char __user *arg)
3655 {
3656         int rc;
3657
3658         acquire_console_sem();
3659         rc = set_get_cmap (arg,0);
3660         release_console_sem();
3661
3662         return rc;
3663 }
3664
3665 void reset_palette(struct vc_data *vc)
3666 {
3667         int j, k;
3668         for (j=k=0; j<16; j++) {
3669                 vc->vc_palette[k++] = default_red[j];
3670                 vc->vc_palette[k++] = default_grn[j];
3671                 vc->vc_palette[k++] = default_blu[j];
3672         }
3673         set_palette(vc);
3674 }
3675
3676 /*
3677  *  Font switching
3678  *
3679  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3680  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3681  *  depending on width) reserved for each character which is kinda wasty, but
3682  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3683  *  is upto the actual low-level console-driver convert data into its favorite
3684  *  format (maybe we should add a `fontoffset' field to the `display'
3685  *  structure so we won't have to convert the fontdata all the time.
3686  *  /Jes
3687  */
3688
3689 #define max_font_size 65536
3690
3691 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3692 {
3693         struct console_font font;
3694         int rc = -EINVAL;
3695         int c;
3696
3697         if (vc->vc_mode != KD_TEXT)
3698                 return -EINVAL;
3699
3700         if (op->data) {
3701                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3702                 if (!font.data)
3703                         return -ENOMEM;
3704         } else
3705                 font.data = NULL;
3706
3707         acquire_console_sem();
3708         if (vc->vc_sw->con_font_get)
3709                 rc = vc->vc_sw->con_font_get(vc, &font);
3710         else
3711                 rc = -ENOSYS;
3712         release_console_sem();
3713
3714         if (rc)
3715                 goto out;
3716
3717         c = (font.width+7)/8 * 32 * font.charcount;
3718
3719         if (op->data && font.charcount > op->charcount)
3720                 rc = -ENOSPC;
3721         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3722                 if (font.width > op->width || font.height > op->height)
3723                         rc = -ENOSPC;
3724         } else {
3725                 if (font.width != 8)
3726                         rc = -EIO;
3727                 else if ((op->height && font.height > op->height) ||
3728                          font.height > 32)
3729                         rc = -ENOSPC;
3730         }
3731         if (rc)
3732                 goto out;
3733
3734         op->height = font.height;
3735         op->width = font.width;
3736         op->charcount = font.charcount;
3737
3738         if (op->data && copy_to_user(op->data, font.data, c))
3739                 rc = -EFAULT;
3740
3741 out:
3742         kfree(font.data);
3743         return rc;
3744 }
3745
3746 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3747 {
3748         struct console_font font;
3749         int rc = -EINVAL;
3750         int size;
3751
3752         if (vc->vc_mode != KD_TEXT)
3753                 return -EINVAL;
3754         if (!op->data)
3755                 return -EINVAL;
3756         if (op->charcount > 512)
3757                 return -EINVAL;
3758         if (!op->height) {              /* Need to guess font height [compat] */
3759                 int h, i;
3760                 u8 __user *charmap = op->data;
3761                 u8 tmp;
3762
3763                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3764                    so that we can get rid of this soon */
3765                 if (!(op->flags & KD_FONT_FLAG_OLD))
3766                         return -EINVAL;
3767                 for (h = 32; h > 0; h--)
3768                         for (i = 0; i < op->charcount; i++) {
3769                                 if (get_user(tmp, &charmap[32*i+h-1]))
3770                                         return -EFAULT;
3771                                 if (tmp)
3772                                         goto nonzero;
3773                         }
3774                 return -EINVAL;
3775         nonzero:
3776                 op->height = h;
3777         }
3778         if (op->width <= 0 || op->width > 32 || op->height > 32)
3779                 return -EINVAL;
3780         size = (op->width+7)/8 * 32 * op->charcount;
3781         if (size > max_font_size)
3782                 return -ENOSPC;
3783         font.charcount = op->charcount;
3784         font.height = op->height;
3785         font.width = op->width;
3786         font.data = kmalloc(size, GFP_KERNEL);
3787         if (!font.data)
3788                 return -ENOMEM;
3789         if (copy_from_user(font.data, op->data, size)) {
3790                 kfree(font.data);
3791                 return -EFAULT;
3792         }
3793         acquire_console_sem();
3794         if (vc->vc_sw->con_font_set)
3795                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3796         else
3797                 rc = -ENOSYS;
3798         release_console_sem();
3799         kfree(font.data);
3800         return rc;
3801 }
3802
3803 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3804 {
3805         struct console_font font = {.width = op->width, .height = op->height};
3806         char name[MAX_FONT_NAME];
3807         char *s = name;
3808         int rc;
3809
3810         if (vc->vc_mode != KD_TEXT)
3811                 return -EINVAL;
3812
3813         if (!op->data)
3814                 s = NULL;
3815         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3816                 return -EFAULT;
3817         else
3818                 name[MAX_FONT_NAME - 1] = 0;
3819
3820         acquire_console_sem();
3821         if (vc->vc_sw->con_font_default)
3822                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3823         else
3824                 rc = -ENOSYS;
3825         release_console_sem();
3826         if (!rc) {
3827                 op->width = font.width;
3828                 op->height = font.height;
3829         }
3830         return rc;
3831 }
3832
3833 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3834 {
3835         int con = op->height;
3836         int rc;
3837
3838         if (vc->vc_mode != KD_TEXT)
3839                 return -EINVAL;
3840
3841         acquire_console_sem();
3842         if (!vc->vc_sw->con_font_copy)
3843                 rc = -ENOSYS;
3844         else if (con < 0 || !vc_cons_allocated(con))
3845                 rc = -ENOTTY;
3846         else if (con == vc->vc_num)     /* nothing to do */
3847                 rc = 0;
3848         else
3849                 rc = vc->vc_sw->con_font_copy(vc, con);
3850         release_console_sem();
3851         return rc;
3852 }
3853
3854 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3855 {
3856         switch (op->op) {
3857         case KD_FONT_OP_SET:
3858                 return con_font_set(vc, op);
3859         case KD_FONT_OP_GET:
3860                 return con_font_get(vc, op);
3861         case KD_FONT_OP_SET_DEFAULT:
3862                 return con_font_default(vc, op);
3863         case KD_FONT_OP_COPY:
3864                 return con_font_copy(vc, op);
3865         }
3866         return -ENOSYS;
3867 }
3868
3869 /*
3870  *      Interface exported to selection and vcs.
3871  */
3872
3873 /* used by selection */
3874 u16 screen_glyph(struct vc_data *vc, int offset)
3875 {
3876         u16 w = scr_readw(screenpos(vc, offset, 1));
3877         u16 c = w & 0xff;
3878
3879         if (w & vc->vc_hi_font_mask)
3880                 c |= 0x100;
3881         return c;
3882 }
3883
3884 /* used by vcs - note the word offset */
3885 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3886 {
3887         return screenpos(vc, 2 * w_offset, viewed);
3888 }
3889
3890 void getconsxy(struct vc_data *vc, unsigned char *p)
3891 {
3892         p[0] = vc->vc_x;
3893         p[1] = vc->vc_y;
3894 }
3895
3896 void putconsxy(struct vc_data *vc, unsigned char *p)
3897 {
3898         hide_cursor(vc);
3899         gotoxy(vc, p[0], p[1]);
3900         set_cursor(vc);
3901 }
3902
3903 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3904 {
3905         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3906                 return softcursor_original;
3907         return scr_readw(org);
3908 }
3909
3910 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3911 {
3912         scr_writew(val, org);
3913         if ((unsigned long)org == vc->vc_pos) {
3914                 softcursor_original = -1;
3915                 add_softcursor(vc);
3916         }
3917 }
3918
3919 /*
3920  *      Visible symbols for modules
3921  */
3922
3923 EXPORT_SYMBOL(color_table);
3924 EXPORT_SYMBOL(default_red);
3925 EXPORT_SYMBOL(default_grn);
3926 EXPORT_SYMBOL(default_blu);
3927 EXPORT_SYMBOL(update_region);
3928 EXPORT_SYMBOL(redraw_screen);
3929 EXPORT_SYMBOL(vc_resize);
3930 EXPORT_SYMBOL(vc_lock_resize);
3931 EXPORT_SYMBOL(fg_console);
3932 EXPORT_SYMBOL(console_blank_hook);
3933 EXPORT_SYMBOL(console_blanked);
3934 EXPORT_SYMBOL(vc_cons);
3935 #ifndef VT_SINGLE_DRIVER
3936 EXPORT_SYMBOL(take_over_console);
3937 EXPORT_SYMBOL(give_up_console);
3938 #endif