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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             visual_init(vc, currcons, 1);
 728             if (!*vc->vc_uni_pagedir_loc)
 729                 con_set_default_unimap(vc);
 730             if (!vc->vc_kmalloced)
 731                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 732             if (!vc->vc_screenbuf) {
 733                 kfree(vc);
 734                 vc_cons[currcons].d = NULL;
 735                 return -ENOMEM;
 736             }
 737             vc->vc_kmalloced = 1;
 738             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 739         }
 740         return 0;
 741 }
 742
 743 static inline int resize_screen(struct vc_data *vc, int width, int height)
 744 {
 745         /* Resizes the resolution of the display adapater */
 746         int err = 0;
 747
 748         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 749                 err = vc->vc_sw->con_resize(vc, width, height);
 750         return err;
 751 }
 752
 753 /*
 754  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 755  * [this is to be used together with some user program
 756  * like resize that changes the hardware videomode]
 757  */
 758 #define VC_RESIZE_MAXCOL (32767)
 759 #define VC_RESIZE_MAXROW (32767)
 760 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 761 {
 762         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 763         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 764         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 765         unsigned int end;
 766         unsigned short *newscreen;
 767
 768         WARN_CONSOLE_UNLOCKED();
 769
 770         if (!vc)
 771                 return -ENXIO;
 772
 773         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 774                 return -EINVAL;
 775
 776         new_cols = (cols ? cols : vc->vc_cols);
 777         new_rows = (lines ? lines : vc->vc_rows);
 778         new_row_size = new_cols << 1;
 779         new_screen_size = new_row_size * new_rows;
 780
 781         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 782                 return 0;
 783
 784         newscreen = kmalloc(new_screen_size, GFP_USER);
 785         if (!newscreen)
 786                 return -ENOMEM;
 787
 788         old_rows = vc->vc_rows;
 789         old_cols = vc->vc_cols;
 790         old_row_size = vc->vc_size_row;
 791         old_screen_size = vc->vc_screenbuf_size;
 792
 793         err = resize_screen(vc, new_cols, new_rows);
 794         if (err) {
 795                 kfree(newscreen);
 796                 return err;
 797         }
 798
 799         vc->vc_rows = new_rows;
 800         vc->vc_cols = new_cols;
 801         vc->vc_size_row = new_row_size;
 802         vc->vc_screenbuf_size = new_screen_size;
 803
 804         rlth = min(old_row_size, new_row_size);
 805         rrem = new_row_size - rlth;
 806         old_origin = vc->vc_origin;
 807         new_origin = (long) newscreen;
 808         new_scr_end = new_origin + new_screen_size;
 809
 810         if (vc->vc_y > new_rows) {
 811                 if (old_rows - vc->vc_y < new_rows) {
 812                         /*
 813                          * Cursor near the bottom, copy contents from the
 814                          * bottom of buffer
 815                          */
 816                         old_origin += (old_rows - new_rows) * old_row_size;
 817                         end = vc->vc_scr_end;
 818                 } else {
 819                         /*
 820                          * Cursor is in no man's land, copy 1/2 screenful
 821                          * from the top and bottom of cursor position
 822                          */
 823                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 824                         end = old_origin + (old_row_size * new_rows);
 825                 }
 826         } else
 827                 /*
 828                  * Cursor near the top, copy contents from the top of buffer
 829                  */
 830                 end = (old_rows > new_rows) ? old_origin +
 831                         (old_row_size * new_rows) :
 832                         vc->vc_scr_end;
 833
 834         update_attr(vc);
 835
 836         while (old_origin < end) {
 837                 scr_memcpyw((unsigned short *) new_origin,
 838                             (unsigned short *) old_origin, rlth);
 839                 if (rrem)
 840                         scr_memsetw((void *)(new_origin + rlth),
 841                                     vc->vc_video_erase_char, rrem);
 842                 old_origin += old_row_size;
 843                 new_origin += new_row_size;
 844         }
 845         if (new_scr_end > new_origin)
 846                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 847                             new_scr_end - new_origin);
 848         if (vc->vc_kmalloced)
 849                 kfree(vc->vc_screenbuf);
 850         vc->vc_screenbuf = newscreen;
 851         vc->vc_kmalloced = 1;
 852         vc->vc_screenbuf_size = new_screen_size;
 853         set_origin(vc);
 854
 855         /* do part of a reset_terminal() */
 856         vc->vc_top = 0;
 857         vc->vc_bottom = vc->vc_rows;
 858         gotoxy(vc, vc->vc_x, vc->vc_y);
 859         save_cur(vc);
 860
 861         if (vc->vc_tty) {
 862                 struct winsize ws, *cws = &vc->vc_tty->winsize;
 863
 864                 memset(&ws, 0, sizeof(ws));
 865                 ws.ws_row = vc->vc_rows;
 866                 ws.ws_col = vc->vc_cols;
 867                 ws.ws_ypixel = vc->vc_scan_lines;
 868                 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
 869                     vc->vc_tty->pgrp)
 870                         kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
 871                 *cws = ws;
 872         }
 873
 874         if (CON_IS_VISIBLE(vc))
 875                 update_screen(vc);
 876         return err;
 877 }
 878
 879 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 880 {
 881         int rc;
 882
 883         acquire_console_sem();
 884         rc = vc_resize(vc, cols, lines);
 885         release_console_sem();
 886         return rc;
 887 }
 888
 889 void vc_deallocate(unsigned int currcons)
 890 {
 891         WARN_CONSOLE_UNLOCKED();
 892
 893         if (vc_cons_allocated(currcons)) {
 894                 struct vc_data *vc = vc_cons[currcons].d;
 895                 vc->vc_sw->con_deinit(vc);
 896                 put_pid(vc->vt_pid);
 897                 module_put(vc->vc_sw->owner);
 898                 if (vc->vc_kmalloced)
 899                         kfree(vc->vc_screenbuf);
 900                 if (currcons >= MIN_NR_CONSOLES)
 901                         kfree(vc);
 902                 vc_cons[currcons].d = NULL;
 903         }
 904 }
 905
 906 /*
 907  *      VT102 emulator
 908  */
 909
 910 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 911 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 912 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
 913
 914 #define decarm          VC_REPEAT
 915 #define decckm          VC_CKMODE
 916 #define kbdapplic       VC_APPLIC
 917 #define lnm             VC_CRLF
 918
 919 /*
 920  * this is what the terminal answers to a ESC-Z or csi0c query.
 921  */
 922 #define VT100ID "\033[?1;2c"
 923 #define VT102ID "\033[?6c"
 924
 925 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
 926                                        8,12,10,14, 9,13,11,15 };
 927
 928 /* the default colour table, for VGA+ colour systems */
 929 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
 930     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
 931 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
 932     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
 933 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
 934     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
 935
 936 /*
 937  * gotoxy() must verify all boundaries, because the arguments
 938  * might also be negative. If the given position is out of
 939  * bounds, the cursor is placed at the nearest margin.
 940  */
 941 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
 942 {
 943         int min_y, max_y;
 944
 945         if (new_x < 0)
 946                 vc->vc_x = 0;
 947         else {
 948                 if (new_x >= vc->vc_cols)
 949                         vc->vc_x = vc->vc_cols - 1;
 950                 else
 951                         vc->vc_x = new_x;
 952         }
 953
 954         if (vc->vc_decom) {
 955                 min_y = vc->vc_top;
 956                 max_y = vc->vc_bottom;
 957         } else {
 958                 min_y = 0;
 959                 max_y = vc->vc_rows;
 960         }
 961         if (new_y < min_y)
 962                 vc->vc_y = min_y;
 963         else if (new_y >= max_y)
 964                 vc->vc_y = max_y - 1;
 965         else
 966                 vc->vc_y = new_y;
 967         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
 968         vc->vc_need_wrap = 0;
 969 }
 970
 971 /* for absolute user moves, when decom is set */
 972 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
 973 {
 974         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
 975 }
 976
 977 void scrollback(struct vc_data *vc, int lines)
 978 {
 979         if (!lines)
 980                 lines = vc->vc_rows / 2;
 981         scrolldelta(-lines);
 982 }
 983
 984 void scrollfront(struct vc_data *vc, int lines)
 985 {
 986         if (!lines)
 987                 lines = vc->vc_rows / 2;
 988         scrolldelta(lines);
 989 }
 990
 991 static void lf(struct vc_data *vc)
 992 {
 993         /* don't scroll if above bottom of scrolling region, or
 994          * if below scrolling region
 995          */
 996         if (vc->vc_y + 1 == vc->vc_bottom)
 997                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
 998         else if (vc->vc_y < vc->vc_rows - 1) {
 999                 vc->vc_y++;
1000                 vc->vc_pos += vc->vc_size_row;
1001         }
1002         vc->vc_need_wrap = 0;
1003 }
1004
1005 static void ri(struct vc_data *vc)
1006 {
1007         /* don't scroll if below top of scrolling region, or
1008          * if above scrolling region
1009          */
1010         if (vc->vc_y == vc->vc_top)
1011                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1012         else if (vc->vc_y > 0) {
1013                 vc->vc_y--;
1014                 vc->vc_pos -= vc->vc_size_row;
1015         }
1016         vc->vc_need_wrap = 0;
1017 }
1018
1019 static inline void cr(struct vc_data *vc)
1020 {
1021         vc->vc_pos -= vc->vc_x << 1;
1022         vc->vc_need_wrap = vc->vc_x = 0;
1023 }
1024
1025 static inline void bs(struct vc_data *vc)
1026 {
1027         if (vc->vc_x) {
1028                 vc->vc_pos -= 2;
1029                 vc->vc_x--;
1030                 vc->vc_need_wrap = 0;
1031         }
1032 }
1033
1034 static inline void del(struct vc_data *vc)
1035 {
1036         /* ignored */
1037 }
1038
1039 static void csi_J(struct vc_data *vc, int vpar)
1040 {
1041         unsigned int count;
1042         unsigned short * start;
1043
1044         switch (vpar) {
1045                 case 0: /* erase from cursor to end of display */
1046                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1047                         start = (unsigned short *)vc->vc_pos;
1048                         if (DO_UPDATE(vc)) {
1049                                 /* do in two stages */
1050                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1051                                               vc->vc_cols - vc->vc_x);
1052                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1053                                               vc->vc_rows - vc->vc_y - 1,
1054                                               vc->vc_cols);
1055                         }
1056                         break;
1057                 case 1: /* erase from start to cursor */
1058                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1059                         start = (unsigned short *)vc->vc_origin;
1060                         if (DO_UPDATE(vc)) {
1061                                 /* do in two stages */
1062                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1063                                               vc->vc_cols);
1064                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1065                                               vc->vc_x + 1);
1066                         }
1067                         break;
1068                 case 2: /* erase whole display */
1069                         count = vc->vc_cols * vc->vc_rows;
1070                         start = (unsigned short *)vc->vc_origin;
1071                         if (DO_UPDATE(vc))
1072                                 vc->vc_sw->con_clear(vc, 0, 0,
1073                                               vc->vc_rows,
1074                                               vc->vc_cols);
1075                         break;
1076                 default:
1077                         return;
1078         }
1079         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1080         vc->vc_need_wrap = 0;
1081 }
1082
1083 static void csi_K(struct vc_data *vc, int vpar)
1084 {
1085         unsigned int count;
1086         unsigned short * start;
1087
1088         switch (vpar) {
1089                 case 0: /* erase from cursor to end of line */
1090                         count = vc->vc_cols - vc->vc_x;
1091                         start = (unsigned short *)vc->vc_pos;
1092                         if (DO_UPDATE(vc))
1093                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1094                                                      vc->vc_cols - vc->vc_x);
1095                         break;
1096                 case 1: /* erase from start of line to cursor */
1097                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1098                         count = vc->vc_x + 1;
1099                         if (DO_UPDATE(vc))
1100                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1101                                                      vc->vc_x + 1);
1102                         break;
1103                 case 2: /* erase whole line */
1104                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1105                         count = vc->vc_cols;
1106                         if (DO_UPDATE(vc))
1107                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1108                                               vc->vc_cols);
1109                         break;
1110                 default:
1111                         return;
1112         }
1113         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1114         vc->vc_need_wrap = 0;
1115 }
1116
1117 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1118 {                                         /* not vt100? */
1119         int count;
1120
1121         if (!vpar)
1122                 vpar++;
1123         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1124
1125         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1126         if (DO_UPDATE(vc))
1127                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1128         vc->vc_need_wrap = 0;
1129 }
1130
1131 static void default_attr(struct vc_data *vc)
1132 {
1133         vc->vc_intensity = 1;
1134         vc->vc_underline = 0;
1135         vc->vc_reverse = 0;
1136         vc->vc_blink = 0;
1137         vc->vc_color = vc->vc_def_color;
1138 }
1139
1140 /* console_sem is held */
1141 static void csi_m(struct vc_data *vc)
1142 {
1143         int i;
1144
1145         for (i = 0; i <= vc->vc_npar; i++)
1146                 switch (vc->vc_par[i]) {
1147                         case 0: /* all attributes off */
1148                                 default_attr(vc);
1149                                 break;
1150                         case 1:
1151                                 vc->vc_intensity = 2;
1152                                 break;
1153                         case 2:
1154                                 vc->vc_intensity = 0;
1155                                 break;
1156                         case 4:
1157                                 vc->vc_underline = 1;
1158                                 break;
1159                         case 5:
1160                                 vc->vc_blink = 1;
1161                                 break;
1162                         case 7:
1163                                 vc->vc_reverse = 1;
1164                                 break;
1165                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1166                                   * Select primary font, don't display
1167                                   * control chars if defined, don't set
1168                                   * bit 8 on output.
1169                                   */
1170                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1171                                                 ? vc->vc_G0_charset
1172                                                 : vc->vc_G1_charset, vc);
1173                                 vc->vc_disp_ctrl = 0;
1174                                 vc->vc_toggle_meta = 0;
1175                                 break;
1176                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1177                                   * Select first alternate font, lets
1178                                   * chars < 32 be displayed as ROM chars.
1179                                   */
1180                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1181                                 vc->vc_disp_ctrl = 1;
1182                                 vc->vc_toggle_meta = 0;
1183                                 break;
1184                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1185                                   * Select second alternate font, toggle
1186                                   * high bit before displaying as ROM char.
1187                                   */
1188                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1189                                 vc->vc_disp_ctrl = 1;
1190                                 vc->vc_toggle_meta = 1;
1191                                 break;
1192                         case 21:
1193                         case 22:
1194                                 vc->vc_intensity = 1;
1195                                 break;
1196                         case 24:
1197                                 vc->vc_underline = 0;
1198                                 break;
1199                         case 25:
1200                                 vc->vc_blink = 0;
1201                                 break;
1202                         case 27:
1203                                 vc->vc_reverse = 0;
1204                                 break;
1205                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1206                                   * Enables underscore, white foreground
1207                                   * with white underscore (Linux - use
1208                                   * default foreground).
1209                                   */
1210                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1211                                 vc->vc_underline = 1;
1212                                 break;
1213                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1214                                   * Disable underline option.
1215                                   * Reset colour to default? It did this
1216                                   * before...
1217                                   */
1218                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1219                                 vc->vc_underline = 0;
1220                                 break;
1221                         case 49:
1222                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1223                                 break;
1224                         default:
1225                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1226                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1227                                                 | (vc->vc_color & 0xf0);
1228                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1229                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1230                                                 | (vc->vc_color & 0x0f);
1231                                 break;
1232                 }
1233         update_attr(vc);
1234 }
1235
1236 static void respond_string(const char *p, struct tty_struct *tty)
1237 {
1238         while (*p) {
1239                 tty_insert_flip_char(tty, *p, 0);
1240                 p++;
1241         }
1242         con_schedule_flip(tty);
1243 }
1244
1245 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1246 {
1247         char buf[40];
1248
1249         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1250         respond_string(buf, tty);
1251 }
1252
1253 static inline void status_report(struct tty_struct *tty)
1254 {
1255         respond_string("\033[0n", tty); /* Terminal ok */
1256 }
1257
1258 static inline void respond_ID(struct tty_struct * tty)
1259 {
1260         respond_string(VT102ID, tty);
1261 }
1262
1263 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1264 {
1265         char buf[8];
1266
1267         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1268                 (char)('!' + mry));
1269         respond_string(buf, tty);
1270 }
1271
1272 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1273 int mouse_reporting(void)
1274 {
1275         return vc_cons[fg_console].d->vc_report_mouse;
1276 }
1277
1278 /* console_sem is held */
1279 static void set_mode(struct vc_data *vc, int on_off)
1280 {
1281         int i;
1282
1283         for (i = 0; i <= vc->vc_npar; i++)
1284                 if (vc->vc_ques) {
1285                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1286                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1287                                 if (on_off)
1288                                         set_kbd(vc, decckm);
1289                                 else
1290                                         clr_kbd(vc, decckm);
1291                                 break;
1292                         case 3: /* 80/132 mode switch unimplemented */
1293                                 vc->vc_deccolm = on_off;
1294 #if 0
1295                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1296                                 /* this alone does not suffice; some user mode
1297                                    utility has to change the hardware regs */
1298 #endif
1299                                 break;
1300                         case 5:                 /* Inverted screen on/off */
1301                                 if (vc->vc_decscnm != on_off) {
1302                                         vc->vc_decscnm = on_off;
1303                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1304                                         update_attr(vc);
1305                                 }
1306                                 break;
1307                         case 6:                 /* Origin relative/absolute */
1308                                 vc->vc_decom = on_off;
1309                                 gotoxay(vc, 0, 0);
1310                                 break;
1311                         case 7:                 /* Autowrap on/off */
1312                                 vc->vc_decawm = on_off;
1313                                 break;
1314                         case 8:                 /* Autorepeat on/off */
1315                                 if (on_off)
1316                                         set_kbd(vc, decarm);
1317                                 else
1318                                         clr_kbd(vc, decarm);
1319                                 break;
1320                         case 9:
1321                                 vc->vc_report_mouse = on_off ? 1 : 0;
1322                                 break;
1323                         case 25:                /* Cursor on/off */
1324                                 vc->vc_deccm = on_off;
1325                                 break;
1326                         case 1000:
1327                                 vc->vc_report_mouse = on_off ? 2 : 0;
1328                                 break;
1329                         }
1330                 } else {
1331                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1332                         case 3:                 /* Monitor (display ctrls) */
1333                                 vc->vc_disp_ctrl = on_off;
1334                                 break;
1335                         case 4:                 /* Insert Mode on/off */
1336                                 vc->vc_decim = on_off;
1337                                 break;
1338                         case 20:                /* Lf, Enter == CrLf/Lf */
1339                                 if (on_off)
1340                                         set_kbd(vc, lnm);
1341                                 else
1342                                         clr_kbd(vc, lnm);
1343                                 break;
1344                         }
1345                 }
1346 }
1347
1348 /* console_sem is held */
1349 static void setterm_command(struct vc_data *vc)
1350 {
1351         switch(vc->vc_par[0]) {
1352                 case 1: /* set color for underline mode */
1353                         if (vc->vc_can_do_color &&
1354                                         vc->vc_par[1] < 16) {
1355                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1356                                 if (vc->vc_underline)
1357                                         update_attr(vc);
1358                         }
1359                         break;
1360                 case 2: /* set color for half intensity mode */
1361                         if (vc->vc_can_do_color &&
1362                                         vc->vc_par[1] < 16) {
1363                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1364                                 if (vc->vc_intensity == 0)
1365                                         update_attr(vc);
1366                         }
1367                         break;
1368                 case 8: /* store colors as defaults */
1369                         vc->vc_def_color = vc->vc_attr;
1370                         if (vc->vc_hi_font_mask == 0x100)
1371                                 vc->vc_def_color >>= 1;
1372                         default_attr(vc);
1373                         update_attr(vc);
1374                         break;
1375                 case 9: /* set blanking interval */
1376                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1377                         poke_blanked_console();
1378                         break;
1379                 case 10: /* set bell frequency in Hz */
1380                         if (vc->vc_npar >= 1)
1381                                 vc->vc_bell_pitch = vc->vc_par[1];
1382                         else
1383                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1384                         break;
1385                 case 11: /* set bell duration in msec */
1386                         if (vc->vc_npar >= 1)
1387                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1388                                         vc->vc_par[1] * HZ / 1000 : 0;
1389                         else
1390                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1391                         break;
1392                 case 12: /* bring specified console to the front */
1393                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1394                                 set_console(vc->vc_par[1] - 1);
1395                         break;
1396                 case 13: /* unblank the screen */
1397                         poke_blanked_console();
1398                         break;
1399                 case 14: /* set vesa powerdown interval */
1400                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1401                         break;
1402                 case 15: /* activate the previous console */
1403                         set_console(last_console);
1404                         break;
1405         }
1406 }
1407
1408 /* console_sem is held */
1409 static void csi_at(struct vc_data *vc, unsigned int nr)
1410 {
1411         if (nr > vc->vc_cols - vc->vc_x)
1412                 nr = vc->vc_cols - vc->vc_x;
1413         else if (!nr)
1414                 nr = 1;
1415         insert_char(vc, nr);
1416 }
1417
1418 /* console_sem is held */
1419 static void csi_L(struct vc_data *vc, unsigned int nr)
1420 {
1421         if (nr > vc->vc_rows - vc->vc_y)
1422                 nr = vc->vc_rows - vc->vc_y;
1423         else if (!nr)
1424                 nr = 1;
1425         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1426         vc->vc_need_wrap = 0;
1427 }
1428
1429 /* console_sem is held */
1430 static void csi_P(struct vc_data *vc, unsigned int nr)
1431 {
1432         if (nr > vc->vc_cols - vc->vc_x)
1433                 nr = vc->vc_cols - vc->vc_x;
1434         else if (!nr)
1435                 nr = 1;
1436         delete_char(vc, nr);
1437 }
1438
1439 /* console_sem is held */
1440 static void csi_M(struct vc_data *vc, unsigned int nr)
1441 {
1442         if (nr > vc->vc_rows - vc->vc_y)
1443                 nr = vc->vc_rows - vc->vc_y;
1444         else if (!nr)
1445                 nr=1;
1446         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1447         vc->vc_need_wrap = 0;
1448 }
1449
1450 /* console_sem is held (except via vc_init->reset_terminal */
1451 static void save_cur(struct vc_data *vc)
1452 {
1453         vc->vc_saved_x          = vc->vc_x;
1454         vc->vc_saved_y          = vc->vc_y;
1455         vc->vc_s_intensity      = vc->vc_intensity;
1456         vc->vc_s_underline      = vc->vc_underline;
1457         vc->vc_s_blink          = vc->vc_blink;
1458         vc->vc_s_reverse        = vc->vc_reverse;
1459         vc->vc_s_charset        = vc->vc_charset;
1460         vc->vc_s_color          = vc->vc_color;
1461         vc->vc_saved_G0         = vc->vc_G0_charset;
1462         vc->vc_saved_G1         = vc->vc_G1_charset;
1463 }
1464
1465 /* console_sem is held */
1466 static void restore_cur(struct vc_data *vc)
1467 {
1468         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1469         vc->vc_intensity        = vc->vc_s_intensity;
1470         vc->vc_underline        = vc->vc_s_underline;
1471         vc->vc_blink            = vc->vc_s_blink;
1472         vc->vc_reverse          = vc->vc_s_reverse;
1473         vc->vc_charset          = vc->vc_s_charset;
1474         vc->vc_color            = vc->vc_s_color;
1475         vc->vc_G0_charset       = vc->vc_saved_G0;
1476         vc->vc_G1_charset       = vc->vc_saved_G1;
1477         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1478         update_attr(vc);
1479         vc->vc_need_wrap = 0;
1480 }
1481
1482 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1483         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1484         ESpalette };
1485
1486 /* console_sem is held (except via vc_init()) */
1487 static void reset_terminal(struct vc_data *vc, int do_clear)
1488 {
1489         vc->vc_top              = 0;
1490         vc->vc_bottom           = vc->vc_rows;
1491         vc->vc_state            = ESnormal;
1492         vc->vc_ques             = 0;
1493         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1494         vc->vc_G0_charset       = LAT1_MAP;
1495         vc->vc_G1_charset       = GRAF_MAP;
1496         vc->vc_charset          = 0;
1497         vc->vc_need_wrap        = 0;
1498         vc->vc_report_mouse     = 0;
1499         vc->vc_utf              = 0;
1500         vc->vc_utf_count        = 0;
1501
1502         vc->vc_disp_ctrl        = 0;
1503         vc->vc_toggle_meta      = 0;
1504
1505         vc->vc_decscnm          = 0;
1506         vc->vc_decom            = 0;
1507         vc->vc_decawm           = 1;
1508         vc->vc_deccm            = 1;
1509         vc->vc_decim            = 0;
1510
1511         set_kbd(vc, decarm);
1512         clr_kbd(vc, decckm);
1513         clr_kbd(vc, kbdapplic);
1514         clr_kbd(vc, lnm);
1515         kbd_table[vc->vc_num].lockstate = 0;
1516         kbd_table[vc->vc_num].slockstate = 0;
1517         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1518         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1519         /* do not do set_leds here because this causes an endless tasklet loop
1520            when the keyboard hasn't been initialized yet */
1521
1522         vc->vc_cursor_type = CUR_DEFAULT;
1523         vc->vc_complement_mask = vc->vc_s_complement_mask;
1524
1525         default_attr(vc);
1526         update_attr(vc);
1527
1528         vc->vc_tab_stop[0]      = 0x01010100;
1529         vc->vc_tab_stop[1]      =
1530         vc->vc_tab_stop[2]      =
1531         vc->vc_tab_stop[3]      =
1532         vc->vc_tab_stop[4]      = 0x01010101;
1533
1534         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1535         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1536
1537         gotoxy(vc, 0, 0);
1538         save_cur(vc);
1539         if (do_clear)
1540             csi_J(vc, 2);
1541 }
1542
1543 /* console_sem is held */
1544 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1545 {
1546         /*
1547          *  Control characters can be used in the _middle_
1548          *  of an escape sequence.
1549          */
1550         switch (c) {
1551         case 0:
1552                 return;
1553         case 7:
1554                 if (vc->vc_bell_duration)
1555                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1556                 return;
1557         case 8:
1558                 bs(vc);
1559                 return;
1560         case 9:
1561                 vc->vc_pos -= (vc->vc_x << 1);
1562                 while (vc->vc_x < vc->vc_cols - 1) {
1563                         vc->vc_x++;
1564                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1565                                 break;
1566                 }
1567                 vc->vc_pos += (vc->vc_x << 1);
1568                 return;
1569         case 10: case 11: case 12:
1570                 lf(vc);
1571                 if (!is_kbd(vc, lnm))
1572                         return;
1573         case 13:
1574                 cr(vc);
1575                 return;
1576         case 14:
1577                 vc->vc_charset = 1;
1578                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1579                 vc->vc_disp_ctrl = 1;
1580                 return;
1581         case 15:
1582                 vc->vc_charset = 0;
1583                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1584                 vc->vc_disp_ctrl = 0;
1585                 return;
1586         case 24: case 26:
1587                 vc->vc_state = ESnormal;
1588                 return;
1589         case 27:
1590                 vc->vc_state = ESesc;
1591                 return;
1592         case 127:
1593                 del(vc);
1594                 return;
1595         case 128+27:
1596                 vc->vc_state = ESsquare;
1597                 return;
1598         }
1599         switch(vc->vc_state) {
1600         case ESesc:
1601                 vc->vc_state = ESnormal;
1602                 switch (c) {
1603                 case '[':
1604                         vc->vc_state = ESsquare;
1605                         return;
1606                 case ']':
1607                         vc->vc_state = ESnonstd;
1608                         return;
1609                 case '%':
1610                         vc->vc_state = ESpercent;
1611                         return;
1612                 case 'E':
1613                         cr(vc);
1614                         lf(vc);
1615                         return;
1616                 case 'M':
1617                         ri(vc);
1618                         return;
1619                 case 'D':
1620                         lf(vc);
1621                         return;
1622                 case 'H':
1623                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1624                         return;
1625                 case 'Z':
1626                         respond_ID(tty);
1627                         return;
1628                 case '7':
1629                         save_cur(vc);
1630                         return;
1631                 case '8':
1632                         restore_cur(vc);
1633                         return;
1634                 case '(':
1635                         vc->vc_state = ESsetG0;
1636                         return;
1637                 case ')':
1638                         vc->vc_state = ESsetG1;
1639                         return;
1640                 case '#':
1641                         vc->vc_state = EShash;
1642                         return;
1643                 case 'c':
1644                         reset_terminal(vc, 1);
1645                         return;
1646                 case '>':  /* Numeric keypad */
1647                         clr_kbd(vc, kbdapplic);
1648                         return;
1649                 case '=':  /* Appl. keypad */
1650                         set_kbd(vc, kbdapplic);
1651                         return;
1652                 }
1653                 return;
1654         case ESnonstd:
1655                 if (c=='P') {   /* palette escape sequence */
1656                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1657                                 vc->vc_par[vc->vc_npar] = 0;
1658                         vc->vc_npar = 0;
1659                         vc->vc_state = ESpalette;
1660                         return;
1661                 } else if (c=='R') {   /* reset palette */
1662                         reset_palette(vc);
1663                         vc->vc_state = ESnormal;
1664                 } else
1665                         vc->vc_state = ESnormal;
1666                 return;
1667         case ESpalette:
1668                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1669                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1670                         if (vc->vc_npar == 7) {
1671                                 int i = vc->vc_par[0] * 3, j = 1;
1672                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1673                                 vc->vc_palette[i++] += vc->vc_par[j++];
1674                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1675                                 vc->vc_palette[i++] += vc->vc_par[j++];
1676                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1677                                 vc->vc_palette[i] += vc->vc_par[j];
1678                                 set_palette(vc);
1679                                 vc->vc_state = ESnormal;
1680                         }
1681                 } else
1682                         vc->vc_state = ESnormal;
1683                 return;
1684         case ESsquare:
1685                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1686                         vc->vc_par[vc->vc_npar] = 0;
1687                 vc->vc_npar = 0;
1688                 vc->vc_state = ESgetpars;
1689                 if (c == '[') { /* Function key */
1690                         vc->vc_state=ESfunckey;
1691                         return;
1692                 }
1693                 vc->vc_ques = (c == '?');
1694                 if (vc->vc_ques)
1695                         return;
1696         case ESgetpars:
1697                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1698                         vc->vc_npar++;
1699                         return;
1700                 } else if (c>='0' && c<='9') {
1701                         vc->vc_par[vc->vc_npar] *= 10;
1702                         vc->vc_par[vc->vc_npar] += c - '0';
1703                         return;
1704                 } else
1705                         vc->vc_state = ESgotpars;
1706         case ESgotpars:
1707                 vc->vc_state = ESnormal;
1708                 switch(c) {
1709                 case 'h':
1710                         set_mode(vc, 1);
1711                         return;
1712                 case 'l':
1713                         set_mode(vc, 0);
1714                         return;
1715                 case 'c':
1716                         if (vc->vc_ques) {
1717                                 if (vc->vc_par[0])
1718                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1719                                 else
1720                                         vc->vc_cursor_type = CUR_DEFAULT;
1721                                 return;
1722                         }
1723                         break;
1724                 case 'm':
1725                         if (vc->vc_ques) {
1726                                 clear_selection();
1727                                 if (vc->vc_par[0])
1728                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1729                                 else
1730                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1731                                 return;
1732                         }
1733                         break;
1734                 case 'n':
1735                         if (!vc->vc_ques) {
1736                                 if (vc->vc_par[0] == 5)
1737                                         status_report(tty);
1738                                 else if (vc->vc_par[0] == 6)
1739                                         cursor_report(vc, tty);
1740                         }
1741                         return;
1742                 }
1743                 if (vc->vc_ques) {
1744                         vc->vc_ques = 0;
1745                         return;
1746                 }
1747                 switch(c) {
1748                 case 'G': case '`':
1749                         if (vc->vc_par[0])
1750                                 vc->vc_par[0]--;
1751                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1752                         return;
1753                 case 'A':
1754                         if (!vc->vc_par[0])
1755                                 vc->vc_par[0]++;
1756                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1757                         return;
1758                 case 'B': case 'e':
1759                         if (!vc->vc_par[0])
1760                                 vc->vc_par[0]++;
1761                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1762                         return;
1763                 case 'C': case 'a':
1764                         if (!vc->vc_par[0])
1765                                 vc->vc_par[0]++;
1766                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1767                         return;
1768                 case 'D':
1769                         if (!vc->vc_par[0])
1770                                 vc->vc_par[0]++;
1771                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1772                         return;
1773                 case 'E':
1774                         if (!vc->vc_par[0])
1775                                 vc->vc_par[0]++;
1776                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1777                         return;
1778                 case 'F':
1779                         if (!vc->vc_par[0])
1780                                 vc->vc_par[0]++;
1781                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1782                         return;
1783                 case 'd':
1784                         if (vc->vc_par[0])
1785                                 vc->vc_par[0]--;
1786                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1787                         return;
1788                 case 'H': case 'f':
1789                         if (vc->vc_par[0])
1790                                 vc->vc_par[0]--;
1791                         if (vc->vc_par[1])
1792                                 vc->vc_par[1]--;
1793                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1794                         return;
1795                 case 'J':
1796                         csi_J(vc, vc->vc_par[0]);
1797                         return;
1798                 case 'K':
1799                         csi_K(vc, vc->vc_par[0]);
1800                         return;
1801                 case 'L':
1802                         csi_L(vc, vc->vc_par[0]);
1803                         return;
1804                 case 'M':
1805                         csi_M(vc, vc->vc_par[0]);
1806                         return;
1807                 case 'P':
1808                         csi_P(vc, vc->vc_par[0]);
1809                         return;
1810                 case 'c':
1811                         if (!vc->vc_par[0])
1812                                 respond_ID(tty);
1813                         return;
1814                 case 'g':
1815                         if (!vc->vc_par[0])
1816                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1817                         else if (vc->vc_par[0] == 3) {
1818                                 vc->vc_tab_stop[0] =
1819                                         vc->vc_tab_stop[1] =
1820                                         vc->vc_tab_stop[2] =
1821                                         vc->vc_tab_stop[3] =
1822                                         vc->vc_tab_stop[4] = 0;
1823                         }
1824                         return;
1825                 case 'm':
1826                         csi_m(vc);
1827                         return;
1828                 case 'q': /* DECLL - but only 3 leds */
1829                         /* map 0,1,2,3 to 0,1,2,4 */
1830                         if (vc->vc_par[0] < 4)
1831                                 setledstate(kbd_table + vc->vc_num,
1832                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1833                         return;
1834                 case 'r':
1835                         if (!vc->vc_par[0])
1836                                 vc->vc_par[0]++;
1837                         if (!vc->vc_par[1])
1838                                 vc->vc_par[1] = vc->vc_rows;
1839                         /* Minimum allowed region is 2 lines */
1840                         if (vc->vc_par[0] < vc->vc_par[1] &&
1841                             vc->vc_par[1] <= vc->vc_rows) {
1842                                 vc->vc_top = vc->vc_par[0] - 1;
1843                                 vc->vc_bottom = vc->vc_par[1];
1844                                 gotoxay(vc, 0, 0);
1845                         }
1846                         return;
1847                 case 's':
1848                         save_cur(vc);
1849                         return;
1850                 case 'u':
1851                         restore_cur(vc);
1852                         return;
1853                 case 'X':
1854                         csi_X(vc, vc->vc_par[0]);
1855                         return;
1856                 case '@':
1857                         csi_at(vc, vc->vc_par[0]);
1858                         return;
1859                 case ']': /* setterm functions */
1860                         setterm_command(vc);
1861                         return;
1862                 }
1863                 return;
1864         case ESpercent:
1865                 vc->vc_state = ESnormal;
1866                 switch (c) {
1867                 case '@':  /* defined in ISO 2022 */
1868                         vc->vc_utf = 0;
1869                         return;
1870                 case 'G':  /* prelim official escape code */
1871                 case '8':  /* retained for compatibility */
1872                         vc->vc_utf = 1;
1873                         return;
1874                 }
1875                 return;
1876         case ESfunckey:
1877                 vc->vc_state = ESnormal;
1878                 return;
1879         case EShash:
1880                 vc->vc_state = ESnormal;
1881                 if (c == '8') {
1882                         /* DEC screen alignment test. kludge :-) */
1883                         vc->vc_video_erase_char =
1884                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1885                         csi_J(vc, 2);
1886                         vc->vc_video_erase_char =
1887                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1888                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1889                 }
1890                 return;
1891         case ESsetG0:
1892                 if (c == '0')
1893                         vc->vc_G0_charset = GRAF_MAP;
1894                 else if (c == 'B')
1895                         vc->vc_G0_charset = LAT1_MAP;
1896                 else if (c == 'U')
1897                         vc->vc_G0_charset = IBMPC_MAP;
1898                 else if (c == 'K')
1899                         vc->vc_G0_charset = USER_MAP;
1900                 if (vc->vc_charset == 0)
1901                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1902                 vc->vc_state = ESnormal;
1903                 return;
1904         case ESsetG1:
1905                 if (c == '0')
1906                         vc->vc_G1_charset = GRAF_MAP;
1907                 else if (c == 'B')
1908                         vc->vc_G1_charset = LAT1_MAP;
1909                 else if (c == 'U')
1910                         vc->vc_G1_charset = IBMPC_MAP;
1911                 else if (c == 'K')
1912                         vc->vc_G1_charset = USER_MAP;
1913                 if (vc->vc_charset == 1)
1914                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1915                 vc->vc_state = ESnormal;
1916                 return;
1917         default:
1918                 vc->vc_state = ESnormal;
1919         }
1920 }
1921
1922 /* This is a temporary buffer used to prepare a tty console write
1923  * so that we can easily avoid touching user space while holding the
1924  * console spinlock.  It is allocated in con_init and is shared by
1925  * this code and the vc_screen read/write tty calls.
1926  *
1927  * We have to allocate this statically in the kernel data section
1928  * since console_init (and thus con_init) are called before any
1929  * kernel memory allocation is available.
1930  */
1931 char con_buf[CON_BUF_SIZE];
1932 DECLARE_MUTEX(con_buf_sem);
1933
1934 /* acquires console_sem */
1935 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1936 {
1937 #ifdef VT_BUF_VRAM_ONLY
1938 #define FLUSH do { } while(0);
1939 #else
1940 #define FLUSH if (draw_x >= 0) { \
1941         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1942         draw_x = -1; \
1943         }
1944 #endif
1945
1946         int c, tc, ok, n = 0, draw_x = -1;
1947         unsigned int currcons;
1948         unsigned long draw_from = 0, draw_to = 0;
1949         struct vc_data *vc;
1950         u16 himask, charmask;
1951         const unsigned char *orig_buf = NULL;
1952         int orig_count;
1953
1954         if (in_interrupt())
1955                 return count;
1956
1957         might_sleep();
1958
1959         acquire_console_sem();
1960         vc = tty->driver_data;
1961         if (vc == NULL) {
1962                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1963                 release_console_sem();
1964                 return 0;
1965         }
1966
1967         currcons = vc->vc_num;
1968         if (!vc_cons_allocated(currcons)) {
1969             /* could this happen? */
1970             static int error = 0;
1971             if (!error) {
1972                 error = 1;
1973                 printk("con_write: tty %d not allocated\n", currcons+1);
1974             }
1975             release_console_sem();
1976             return 0;
1977         }
1978         release_console_sem();
1979
1980         orig_buf = buf;
1981         orig_count = count;
1982
1983         /* At this point 'buf' is guaranteed to be a kernel buffer
1984          * and therefore no access to userspace (and therefore sleeping)
1985          * will be needed.  The con_buf_sem serializes all tty based
1986          * console rendering and vcs write/read operations.  We hold
1987          * the console spinlock during the entire write.
1988          */
1989
1990         acquire_console_sem();
1991
1992         vc = tty->driver_data;
1993         if (vc == NULL) {
1994                 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1995                 release_console_sem();
1996                 goto out;
1997         }
1998
1999         himask = vc->vc_hi_font_mask;
2000         charmask = himask ? 0x1ff : 0xff;
2001
2002         /* undraw cursor first */
2003         if (IS_FG(vc))
2004                 hide_cursor(vc);
2005
2006         while (!tty->stopped && count) {
2007                 int orig = *buf;
2008                 c = orig;
2009                 buf++;
2010                 n++;
2011                 count--;
2012
2013                 /* Do no translation at all in control states */
2014                 if (vc->vc_state != ESnormal) {
2015                         tc = c;
2016                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2017                     /* Combine UTF-8 into Unicode */
2018                     /* Malformed sequences as sequences of replacement glyphs */
2019 rescan_last_byte:
2020                     if(c > 0x7f) {
2021                         if (vc->vc_utf_count) {
2022                                if ((c & 0xc0) == 0x80) {
2023                                        vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2024                                        if (--vc->vc_utf_count) {
2025                                                vc->vc_npar++;
2026                                                continue;
2027                                        }
2028                                        tc = c = vc->vc_utf_char;
2029                                } else
2030                                        goto replacement_glyph;
2031                         } else {
2032                                 vc->vc_npar = 0;
2033                                 if ((c & 0xe0) == 0xc0) {
2034                                     vc->vc_utf_count = 1;
2035                                     vc->vc_utf_char = (c & 0x1f);
2036                                 } else if ((c & 0xf0) == 0xe0) {
2037                                     vc->vc_utf_count = 2;
2038                                     vc->vc_utf_char = (c & 0x0f);
2039                                 } else if ((c & 0xf8) == 0xf0) {
2040                                     vc->vc_utf_count = 3;
2041                                     vc->vc_utf_char = (c & 0x07);
2042                                 } else if ((c & 0xfc) == 0xf8) {
2043                                     vc->vc_utf_count = 4;
2044                                     vc->vc_utf_char = (c & 0x03);
2045                                 } else if ((c & 0xfe) == 0xfc) {
2046                                     vc->vc_utf_count = 5;
2047                                     vc->vc_utf_char = (c & 0x01);
2048                                 } else
2049                                     goto replacement_glyph;
2050                                 continue;
2051                               }
2052                     } else {
2053                       if (vc->vc_utf_count)
2054                               goto replacement_glyph;
2055                       tc = c;
2056                     }
2057                 } else {        /* no utf or alternate charset mode */
2058                   tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2059                 }
2060
2061                 /* If the original code was a control character we
2062                  * only allow a glyph to be displayed if the code is
2063                  * not normally used (such as for cursor movement) or
2064                  * if the disp_ctrl mode has been explicitly enabled.
2065                  * Certain characters (as given by the CTRL_ALWAYS
2066                  * bitmap) are always displayed as control characters,
2067                  * as the console would be pretty useless without
2068                  * them; to display an arbitrary font position use the
2069                  * direct-to-font zone in UTF-8 mode.
2070                  */
2071                 ok = tc && (c >= 32 ||
2072                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2073                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2074                         && (c != 127 || vc->vc_disp_ctrl)
2075                         && (c != 128+27);
2076
2077                 if (vc->vc_state == ESnormal && ok) {
2078                         /* Now try to find out how to display it */
2079                         tc = conv_uni_to_pc(vc, tc);
2080                         if (tc & ~charmask) {
2081                                 if ( tc == -4 ) {
2082                                 /* If we got -4 (not found) then see if we have
2083                                    defined a replacement character (U+FFFD) */
2084 replacement_glyph:
2085                                         tc = conv_uni_to_pc(vc, 0xfffd);
2086                                         if (!(tc & ~charmask))
2087                                                 goto display_glyph;
2088                                 } else if ( tc != -3 )
2089                                         continue; /* nothing to display */
2090                                 /* no hash table or no replacement --
2091                                  * hope for the best */
2092                                 if ( c & ~charmask )
2093                                         tc = '?';
2094                                 else
2095                                         tc = c;
2096                         }
2097
2098 display_glyph:
2099                         if (vc->vc_need_wrap || vc->vc_decim)
2100                                 FLUSH
2101                         if (vc->vc_need_wrap) {
2102                                 cr(vc);
2103                                 lf(vc);
2104                         }
2105                         if (vc->vc_decim)
2106                                 insert_char(vc, 1);
2107                         scr_writew(himask ?
2108                                      ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2109                                      (vc->vc_attr << 8) + tc,
2110                                    (u16 *) vc->vc_pos);
2111                         if (DO_UPDATE(vc) && draw_x < 0) {
2112                                 draw_x = vc->vc_x;
2113                                 draw_from = vc->vc_pos;
2114                         }
2115                         if (vc->vc_x == vc->vc_cols - 1) {
2116                                 vc->vc_need_wrap = vc->vc_decawm;
2117                                 draw_to = vc->vc_pos + 2;
2118                         } else {
2119                                 vc->vc_x++;
2120                                 draw_to = (vc->vc_pos += 2);
2121                         }
2122                         if (vc->vc_utf_count) {
2123                                 if (vc->vc_npar) {
2124                                         vc->vc_npar--;
2125                                         goto display_glyph;
2126                                 }
2127                                 vc->vc_utf_count = 0;
2128                                 c = orig;
2129                                 goto rescan_last_byte;
2130                         }
2131                         continue;
2132                 }
2133                 FLUSH
2134                 do_con_trol(tty, vc, orig);
2135         }
2136         FLUSH
2137         console_conditional_schedule();
2138         release_console_sem();
2139
2140 out:
2141         return n;
2142 #undef FLUSH
2143 }
2144
2145 /*
2146  * This is the console switching callback.
2147  *
2148  * Doing console switching in a process context allows
2149  * us to do the switches asynchronously (needed when we want
2150  * to switch due to a keyboard interrupt).  Synchronization
2151  * with other console code and prevention of re-entrancy is
2152  * ensured with console_sem.
2153  */
2154 static void console_callback(struct work_struct *ignored)
2155 {
2156         acquire_console_sem();
2157
2158         if (want_console >= 0) {
2159                 if (want_console != fg_console &&
2160                     vc_cons_allocated(want_console)) {
2161                         hide_cursor(vc_cons[fg_console].d);
2162                         change_console(vc_cons[want_console].d);
2163                         /* we only changed when the console had already
2164                            been allocated - a new console is not created
2165                            in an interrupt routine */
2166                 }
2167                 want_console = -1;
2168         }
2169         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2170                 do_poke_blanked_console = 0;
2171                 poke_blanked_console();
2172         }
2173         if (scrollback_delta) {
2174                 struct vc_data *vc = vc_cons[fg_console].d;
2175                 clear_selection();
2176                 if (vc->vc_mode == KD_TEXT)
2177                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2178                 scrollback_delta = 0;
2179         }
2180         if (blank_timer_expired) {
2181                 do_blank_screen(0);
2182                 blank_timer_expired = 0;
2183         }
2184
2185         release_console_sem();
2186 }
2187
2188 void set_console(int nr)
2189 {
2190         want_console = nr;
2191         schedule_console_callback();
2192 }
2193
2194 struct tty_driver *console_driver;
2195
2196 #ifdef CONFIG_VT_CONSOLE
2197
2198 /*
2199  *      Console on virtual terminal
2200  *
2201  * The console must be locked when we get here.
2202  */
2203
2204 static void vt_console_print(struct console *co, const char *b, unsigned count)
2205 {
2206         struct vc_data *vc = vc_cons[fg_console].d;
2207         unsigned char c;
2208         static unsigned long printing;
2209         const ushort *start;
2210         ushort cnt = 0;
2211         ushort myx;
2212
2213         /* console busy or not yet initialized */
2214         if (!printable || test_and_set_bit(0, &printing))
2215                 return;
2216
2217         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2218                 vc = vc_cons[kmsg_redirect - 1].d;
2219
2220         /* read `x' only after setting currcons properly (otherwise
2221            the `x' macro will read the x of the foreground console). */
2222         myx = vc->vc_x;
2223
2224         if (!vc_cons_allocated(fg_console)) {
2225                 /* impossible */
2226                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2227                 goto quit;
2228         }
2229
2230         if (vc->vc_mode != KD_TEXT)
2231                 goto quit;
2232
2233         /* undraw cursor first */
2234         if (IS_FG(vc))
2235                 hide_cursor(vc);
2236
2237         start = (ushort *)vc->vc_pos;
2238
2239         /* Contrived structure to try to emulate original need_wrap behaviour
2240          * Problems caused when we have need_wrap set on '\n' character */
2241         while (count--) {
2242                 c = *b++;
2243                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2244                         if (cnt > 0) {
2245                                 if (CON_IS_VISIBLE(vc))
2246                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2247                                 vc->vc_x += cnt;
2248                                 if (vc->vc_need_wrap)
2249                                         vc->vc_x--;
2250                                 cnt = 0;
2251                         }
2252                         if (c == 8) {           /* backspace */
2253                                 bs(vc);
2254                                 start = (ushort *)vc->vc_pos;
2255                                 myx = vc->vc_x;
2256                                 continue;
2257                         }
2258                         if (c != 13)
2259                                 lf(vc);
2260                         cr(vc);
2261                         start = (ushort *)vc->vc_pos;
2262                         myx = vc->vc_x;
2263                         if (c == 10 || c == 13)
2264                                 continue;
2265                 }
2266                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2267                 cnt++;
2268                 if (myx == vc->vc_cols - 1) {
2269                         vc->vc_need_wrap = 1;
2270                         continue;
2271                 }
2272                 vc->vc_pos += 2;
2273                 myx++;
2274         }
2275         if (cnt > 0) {
2276                 if (CON_IS_VISIBLE(vc))
2277                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2278                 vc->vc_x += cnt;
2279                 if (vc->vc_x == vc->vc_cols) {
2280                         vc->vc_x--;
2281                         vc->vc_need_wrap = 1;
2282                 }
2283         }
2284         set_cursor(vc);
2285
2286 quit:
2287         clear_bit(0, &printing);
2288 }
2289
2290 static struct tty_driver *vt_console_device(struct console *c, int *index)
2291 {
2292         *index = c->index ? c->index-1 : fg_console;
2293         return console_driver;
2294 }
2295
2296 static struct console vt_console_driver = {
2297         .name           = "tty",
2298         .write          = vt_console_print,
2299         .device         = vt_console_device,
2300         .unblank        = unblank_screen,
2301         .flags          = CON_PRINTBUFFER,
2302         .index          = -1,
2303 };
2304 #endif
2305
2306 /*
2307  *      Handling of Linux-specific VC ioctls
2308  */
2309
2310 /*
2311  * Generally a bit racy with respect to console_sem().
2312  *
2313  * There are some functions which don't need it.
2314  *
2315  * There are some functions which can sleep for arbitrary periods
2316  * (paste_selection) but we don't need the lock there anyway.
2317  *
2318  * set_selection has locking, and definitely needs it
2319  */
2320
2321 int tioclinux(struct tty_struct *tty, unsigned long arg)
2322 {
2323         char type, data;
2324         char __user *p = (char __user *)arg;
2325         int lines;
2326         int ret;
2327
2328         if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2329                 return -EINVAL;
2330         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2331                 return -EPERM;
2332         if (get_user(type, p))
2333                 return -EFAULT;
2334         ret = 0;
2335         switch (type)
2336         {
2337                 case TIOCL_SETSEL:
2338                         acquire_console_sem();
2339                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2340                         release_console_sem();
2341                         break;
2342                 case TIOCL_PASTESEL:
2343                         ret = paste_selection(tty);
2344                         break;
2345                 case TIOCL_UNBLANKSCREEN:
2346                         acquire_console_sem();
2347                         unblank_screen();
2348                         release_console_sem();
2349                         break;
2350                 case TIOCL_SELLOADLUT:
2351                         ret = sel_loadlut(p);
2352                         break;
2353                 case TIOCL_GETSHIFTSTATE:
2354
2355         /*
2356          * Make it possible to react to Shift+Mousebutton.
2357          * Note that 'shift_state' is an undocumented
2358          * kernel-internal variable; programs not closely
2359          * related to the kernel should not use this.
2360          */
2361                         data = shift_state;
2362                         ret = __put_user(data, p);
2363                         break;
2364                 case TIOCL_GETMOUSEREPORTING:
2365                         data = mouse_reporting();
2366                         ret = __put_user(data, p);
2367                         break;
2368                 case TIOCL_SETVESABLANK:
2369                         ret = set_vesa_blanking(p);
2370                         break;
2371                 case TIOCL_GETKMSGREDIRECT:
2372                         data = kmsg_redirect;
2373                         ret = __put_user(data, p);
2374                         break;
2375                 case TIOCL_SETKMSGREDIRECT:
2376                         if (!capable(CAP_SYS_ADMIN)) {
2377                                 ret = -EPERM;
2378                         } else {
2379                                 if (get_user(data, p+1))
2380                                         ret = -EFAULT;
2381                                 else
2382                                         kmsg_redirect = data;
2383                         }
2384                         break;
2385                 case TIOCL_GETFGCONSOLE:
2386                         ret = fg_console;
2387                         break;
2388                 case TIOCL_SCROLLCONSOLE:
2389                         if (get_user(lines, (s32 __user *)(p+4))) {
2390                                 ret = -EFAULT;
2391                         } else {
2392                                 scrollfront(vc_cons[fg_console].d, lines);
2393                                 ret = 0;
2394                         }
2395                         break;
2396                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2397                         acquire_console_sem();
2398                         ignore_poke = 1;
2399                         do_blank_screen(0);
2400                         release_console_sem();
2401                         break;
2402                 case TIOCL_BLANKEDSCREEN:
2403                         ret = console_blanked;
2404                         break;
2405                 default:
2406                         ret = -EINVAL;
2407                         break;
2408         }
2409         return ret;
2410 }
2411
2412 /*
2413  * /dev/ttyN handling
2414  */
2415
2416 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2417 {
2418         int     retval;
2419
2420         retval = do_con_write(tty, buf, count);
2421         con_flush_chars(tty);
2422
2423         return retval;
2424 }
2425
2426 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2427 {
2428         if (in_interrupt())
2429                 return; /* n_r3964 calls put_char() from interrupt context */
2430         do_con_write(tty, &ch, 1);
2431 }
2432
2433 static int con_write_room(struct tty_struct *tty)
2434 {
2435         if (tty->stopped)
2436                 return 0;
2437         return 4096;            /* No limit, really; we're not buffering */
2438 }
2439
2440 static int con_chars_in_buffer(struct tty_struct *tty)
2441 {
2442         return 0;               /* we're not buffering */
2443 }
2444
2445 /*
2446  * con_throttle and con_unthrottle are only used for
2447  * paste_selection(), which has to stuff in a large number of
2448  * characters...
2449  */
2450 static void con_throttle(struct tty_struct *tty)
2451 {
2452 }
2453
2454 static void con_unthrottle(struct tty_struct *tty)
2455 {
2456         struct vc_data *vc = tty->driver_data;
2457
2458         wake_up_interruptible(&vc->paste_wait);
2459 }
2460
2461 /*
2462  * Turn the Scroll-Lock LED on when the tty is stopped
2463  */
2464 static void con_stop(struct tty_struct *tty)
2465 {
2466         int console_num;
2467         if (!tty)
2468                 return;
2469         console_num = tty->index;
2470         if (!vc_cons_allocated(console_num))
2471                 return;
2472         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2473         set_leds();
2474 }
2475
2476 /*
2477  * Turn the Scroll-Lock LED off when the console is started
2478  */
2479 static void con_start(struct tty_struct *tty)
2480 {
2481         int console_num;
2482         if (!tty)
2483                 return;
2484         console_num = tty->index;
2485         if (!vc_cons_allocated(console_num))
2486                 return;
2487         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2488         set_leds();
2489 }
2490
2491 static void con_flush_chars(struct tty_struct *tty)
2492 {
2493         struct vc_data *vc;
2494
2495         if (in_interrupt())     /* from flush_to_ldisc */
2496                 return;
2497
2498         /* if we race with con_close(), vt may be null */
2499         acquire_console_sem();
2500         vc = tty->driver_data;
2501         if (vc)
2502                 set_cursor(vc);
2503         release_console_sem();
2504 }
2505
2506 /*
2507  * Allocate the console screen memory.
2508  */
2509 static int con_open(struct tty_struct *tty, struct file *filp)
2510 {
2511         unsigned int currcons = tty->index;
2512         int ret = 0;
2513
2514         acquire_console_sem();
2515         if (tty->driver_data == NULL) {
2516                 ret = vc_allocate(currcons);
2517                 if (ret == 0) {
2518                         struct vc_data *vc = vc_cons[currcons].d;
2519                         tty->driver_data = vc;
2520                         vc->vc_tty = tty;
2521
2522                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2523                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2524                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2525                         }
2526                         release_console_sem();
2527                         vcs_make_sysfs(tty);
2528                         return ret;
2529                 }
2530         }
2531         release_console_sem();
2532         return ret;
2533 }
2534
2535 /*
2536  * We take tty_mutex in here to prevent another thread from coming in via init_dev
2537  * and taking a ref against the tty while we're in the process of forgetting
2538  * about it and cleaning things up.
2539  *
2540  * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2541  */
2542 static void con_close(struct tty_struct *tty, struct file *filp)
2543 {
2544         mutex_lock(&tty_mutex);
2545         acquire_console_sem();
2546         if (tty && tty->count == 1) {
2547                 struct vc_data *vc = tty->driver_data;
2548
2549                 if (vc)
2550                         vc->vc_tty = NULL;
2551                 tty->driver_data = NULL;
2552                 release_console_sem();
2553                 vcs_remove_sysfs(tty);
2554                 mutex_unlock(&tty_mutex);
2555                 /*
2556                  * tty_mutex is released, but we still hold BKL, so there is
2557                  * still exclusion against init_dev()
2558                  */
2559                 return;
2560         }
2561         release_console_sem();
2562         mutex_unlock(&tty_mutex);
2563 }
2564
2565 static void vc_init(struct vc_data *vc, unsigned int rows,
2566                     unsigned int cols, int do_clear)
2567 {
2568         int j, k ;
2569
2570         vc->vc_cols = cols;
2571         vc->vc_rows = rows;
2572         vc->vc_size_row = cols << 1;
2573         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2574
2575         set_origin(vc);
2576         vc->vc_pos = vc->vc_origin;
2577         reset_vc(vc);
2578         for (j=k=0; j<16; j++) {
2579                 vc->vc_palette[k++] = default_red[j] ;
2580                 vc->vc_palette[k++] = default_grn[j] ;
2581                 vc->vc_palette[k++] = default_blu[j] ;
2582         }
2583         vc->vc_def_color       = 0x07;   /* white */
2584         vc->vc_ulcolor          = 0x0f;   /* bold white */
2585         vc->vc_halfcolor       = 0x08;   /* grey */
2586         init_waitqueue_head(&vc->paste_wait);
2587         reset_terminal(vc, do_clear);
2588 }
2589
2590 /*
2591  * This routine initializes console interrupts, and does nothing
2592  * else. If you want the screen to clear, call tty_write with
2593  * the appropriate escape-sequence.
2594  */
2595
2596 static int __init con_init(void)
2597 {
2598         const char *display_desc = NULL;
2599         struct vc_data *vc;
2600         unsigned int currcons = 0, i;
2601
2602         acquire_console_sem();
2603
2604         if (conswitchp)
2605                 display_desc = conswitchp->con_startup();
2606         if (!display_desc) {
2607                 fg_console = 0;
2608                 release_console_sem();
2609                 return 0;
2610         }
2611
2612         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2613                 struct con_driver *con_driver = &registered_con_driver[i];
2614
2615                 if (con_driver->con == NULL) {
2616                         con_driver->con = conswitchp;
2617                         con_driver->desc = display_desc;
2618                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2619                         con_driver->first = 0;
2620                         con_driver->last = MAX_NR_CONSOLES - 1;
2621                         break;
2622                 }
2623         }
2624
2625         for (i = 0; i < MAX_NR_CONSOLES; i++)
2626                 con_driver_map[i] = conswitchp;
2627
2628         if (blankinterval) {
2629                 blank_state = blank_normal_wait;
2630                 mod_timer(&console_timer, jiffies + blankinterval);
2631         }
2632
2633         /*
2634          * kmalloc is not running yet - we use the bootmem allocator.
2635          */
2636         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2637                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2638                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2639                 visual_init(vc, currcons, 1);
2640                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2641                 vc->vc_kmalloced = 0;
2642                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2643                         currcons || !vc->vc_sw->con_save_screen);
2644         }
2645         currcons = fg_console = 0;
2646         master_display_fg = vc = vc_cons[currcons].d;
2647         set_origin(vc);
2648         save_screen(vc);
2649         gotoxy(vc, vc->vc_x, vc->vc_y);
2650         csi_J(vc, 0);
2651         update_screen(vc);
2652         printk("Console: %s %s %dx%d",
2653                 vc->vc_can_do_color ? "colour" : "mono",
2654                 display_desc, vc->vc_cols, vc->vc_rows);
2655         printable = 1;
2656         printk("\n");
2657
2658         release_console_sem();
2659
2660 #ifdef CONFIG_VT_CONSOLE
2661         register_console(&vt_console_driver);
2662 #endif
2663         return 0;
2664 }
2665 console_initcall(con_init);
2666
2667 static const struct tty_operations con_ops = {
2668         .open = con_open,
2669         .close = con_close,
2670         .write = con_write,
2671         .write_room = con_write_room,
2672         .put_char = con_put_char,
2673         .flush_chars = con_flush_chars,
2674         .chars_in_buffer = con_chars_in_buffer,
2675         .ioctl = vt_ioctl,
2676         .stop = con_stop,
2677         .start = con_start,
2678         .throttle = con_throttle,
2679         .unthrottle = con_unthrottle,
2680 };
2681
2682 int __init vty_init(void)
2683 {
2684         vcs_init();
2685
2686         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2687         if (!console_driver)
2688                 panic("Couldn't allocate console driver\n");
2689         console_driver->owner = THIS_MODULE;
2690         console_driver->name = "tty";
2691         console_driver->name_base = 1;
2692         console_driver->major = TTY_MAJOR;
2693         console_driver->minor_start = 1;
2694         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2695         console_driver->init_termios = tty_std_termios;
2696         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2697         tty_set_operations(console_driver, &con_ops);
2698         if (tty_register_driver(console_driver))
2699                 panic("Couldn't register console driver\n");
2700
2701         kbd_init();
2702         console_map_init();
2703 #ifdef CONFIG_PROM_CONSOLE
2704         prom_con_init();
2705 #endif
2706 #ifdef CONFIG_MDA_CONSOLE
2707         mda_console_init();
2708 #endif
2709         return 0;
2710 }
2711
2712 #ifndef VT_SINGLE_DRIVER
2713 #include <linux/device.h>
2714
2715 static struct class *vtconsole_class;
2716
2717 static int bind_con_driver(const struct consw *csw, int first, int last,
2718                            int deflt)
2719 {
2720         struct module *owner = csw->owner;
2721         const char *desc = NULL;
2722         struct con_driver *con_driver;
2723         int i, j = -1, k = -1, retval = -ENODEV;
2724
2725         if (!try_module_get(owner))
2726                 return -ENODEV;
2727
2728         acquire_console_sem();
2729
2730         /* check if driver is registered */
2731         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2732                 con_driver = &registered_con_driver[i];
2733
2734                 if (con_driver->con == csw) {
2735                         desc = con_driver->desc;
2736                         retval = 0;
2737                         break;
2738                 }
2739         }
2740
2741         if (retval)
2742                 goto err;
2743
2744         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2745                 csw->con_startup();
2746                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2747         }
2748
2749         if (deflt) {
2750                 if (conswitchp)
2751                         module_put(conswitchp->owner);
2752
2753                 __module_get(owner);
2754                 conswitchp = csw;
2755         }
2756
2757         first = max(first, con_driver->first);
2758         last = min(last, con_driver->last);
2759
2760         for (i = first; i <= last; i++) {
2761                 int old_was_color;
2762                 struct vc_data *vc = vc_cons[i].d;
2763
2764                 if (con_driver_map[i])
2765                         module_put(con_driver_map[i]->owner);
2766                 __module_get(owner);
2767                 con_driver_map[i] = csw;
2768
2769                 if (!vc || !vc->vc_sw)
2770                         continue;
2771
2772                 j = i;
2773
2774                 if (CON_IS_VISIBLE(vc)) {
2775                         k = i;
2776                         save_screen(vc);
2777                 }
2778
2779                 old_was_color = vc->vc_can_do_color;
2780                 vc->vc_sw->con_deinit(vc);
2781                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2782                 visual_init(vc, i, 0);
2783                 set_origin(vc);
2784                 update_attr(vc);
2785
2786                 /* If the console changed between mono <-> color, then
2787                  * the attributes in the screenbuf will be wrong.  The
2788                  * following resets all attributes to something sane.
2789                  */
2790                 if (old_was_color != vc->vc_can_do_color)
2791                         clear_buffer_attributes(vc);
2792         }
2793
2794         printk("Console: switching ");
2795         if (!deflt)
2796                 printk("consoles %d-%d ", first+1, last+1);
2797         if (j >= 0) {
2798                 struct vc_data *vc = vc_cons[j].d;
2799
2800                 printk("to %s %s %dx%d\n",
2801                        vc->vc_can_do_color ? "colour" : "mono",
2802                        desc, vc->vc_cols, vc->vc_rows);
2803
2804                 if (k >= 0) {
2805                         vc = vc_cons[k].d;
2806                         update_screen(vc);
2807                 }
2808         } else
2809                 printk("to %s\n", desc);
2810
2811         retval = 0;
2812 err:
2813         release_console_sem();
2814         module_put(owner);
2815         return retval;
2816 };
2817
2818 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2819 static int con_is_graphics(const struct consw *csw, int first, int last)
2820 {
2821         int i, retval = 0;
2822
2823         for (i = first; i <= last; i++) {
2824                 struct vc_data *vc = vc_cons[i].d;
2825
2826                 if (vc && vc->vc_mode == KD_GRAPHICS) {
2827                         retval = 1;
2828                         break;
2829                 }
2830         }
2831
2832         return retval;
2833 }
2834
2835 static int unbind_con_driver(const struct consw *csw, int first, int last,
2836                              int deflt)
2837 {
2838         struct module *owner = csw->owner;
2839         const struct consw *defcsw = NULL;
2840         struct con_driver *con_driver = NULL, *con_back = NULL;
2841         int i, retval = -ENODEV;
2842
2843         if (!try_module_get(owner))
2844                 return -ENODEV;
2845
2846         acquire_console_sem();
2847
2848         /* check if driver is registered and if it is unbindable */
2849         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2850                 con_driver = &registered_con_driver[i];
2851
2852                 if (con_driver->con == csw &&
2853                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2854                         retval = 0;
2855                         break;
2856                 }
2857         }
2858
2859         if (retval) {
2860                 release_console_sem();
2861                 goto err;
2862         }
2863
2864         retval = -ENODEV;
2865
2866         /* check if backup driver exists */
2867         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2868                 con_back = &registered_con_driver[i];
2869
2870                 if (con_back->con &&
2871                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2872                         defcsw = con_back->con;
2873                         retval = 0;
2874                         break;
2875                 }
2876         }
2877
2878         if (retval) {
2879                 release_console_sem();
2880                 goto err;
2881         }
2882
2883         if (!con_is_bound(csw)) {
2884                 release_console_sem();
2885                 goto err;
2886         }
2887
2888         first = max(first, con_driver->first);
2889         last = min(last, con_driver->last);
2890
2891         for (i = first; i <= last; i++) {
2892                 if (con_driver_map[i] == csw) {
2893                         module_put(csw->owner);
2894                         con_driver_map[i] = NULL;
2895                 }
2896         }
2897
2898         if (!con_is_bound(defcsw)) {
2899                 const struct consw *defconsw = conswitchp;
2900
2901                 defcsw->con_startup();
2902                 con_back->flag |= CON_DRIVER_FLAG_INIT;
2903                 /*
2904                  * vgacon may change the default driver to point
2905                  * to dummycon, we restore it here...
2906                  */
2907                 conswitchp = defconsw;
2908         }
2909
2910         if (!con_is_bound(csw))
2911                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2912
2913         release_console_sem();
2914         /* ignore return value, binding should not fail */
2915         bind_con_driver(defcsw, first, last, deflt);
2916 err:
2917         module_put(owner);
2918         return retval;
2919
2920 }
2921
2922 static int vt_bind(struct con_driver *con)
2923 {
2924         const struct consw *defcsw = NULL, *csw = NULL;
2925         int i, more = 1, first = -1, last = -1, deflt = 0;
2926
2927         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2928             con_is_graphics(con->con, con->first, con->last))
2929                 goto err;
2930
2931         csw = con->con;
2932
2933         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2934                 struct con_driver *con = &registered_con_driver[i];
2935
2936                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2937                         defcsw = con->con;
2938                         break;
2939                 }
2940         }
2941
2942         if (!defcsw)
2943                 goto err;
2944
2945         while (more) {
2946                 more = 0;
2947
2948                 for (i = con->first; i <= con->last; i++) {
2949                         if (con_driver_map[i] == defcsw) {
2950                                 if (first == -1)
2951                                         first = i;
2952                                 last = i;
2953                                 more = 1;
2954                         } else if (first != -1)
2955                                 break;
2956                 }
2957
2958                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2959                         deflt = 1;
2960
2961                 if (first != -1)
2962                         bind_con_driver(csw, first, last, deflt);
2963
2964                 first = -1;
2965                 last = -1;
2966                 deflt = 0;
2967         }
2968
2969 err:
2970         return 0;
2971 }
2972
2973 static int vt_unbind(struct con_driver *con)
2974 {
2975         const struct consw *csw = NULL;
2976         int i, more = 1, first = -1, last = -1, deflt = 0;
2977
2978         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2979             con_is_graphics(con->con, con->first, con->last))
2980                 goto err;
2981
2982         csw = con->con;
2983
2984         while (more) {
2985                 more = 0;
2986
2987                 for (i = con->first; i <= con->last; i++) {
2988                         if (con_driver_map[i] == csw) {
2989                                 if (first == -1)
2990                                         first = i;
2991                                 last = i;
2992                                 more = 1;
2993                         } else if (first != -1)
2994                                 break;
2995                 }
2996
2997                 if (first == 0 && last == MAX_NR_CONSOLES -1)
2998                         deflt = 1;
2999
3000                 if (first != -1)
3001                         unbind_con_driver(csw, first, last, deflt);
3002
3003                 first = -1;
3004                 last = -1;
3005                 deflt = 0;
3006         }
3007
3008 err:
3009         return 0;
3010 }
3011 #else
3012 static inline int vt_bind(struct con_driver *con)
3013 {
3014         return 0;
3015 }
3016 static inline int vt_unbind(struct con_driver *con)
3017 {
3018         return 0;
3019 }
3020 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3021
3022 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3023                           const char *buf, size_t count)
3024 {
3025         struct con_driver *con = dev_get_drvdata(dev);
3026         int bind = simple_strtoul(buf, NULL, 0);
3027
3028         if (bind)
3029                 vt_bind(con);
3030         else
3031                 vt_unbind(con);
3032
3033         return count;
3034 }
3035
3036 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3037                          char *buf)
3038 {
3039         struct con_driver *con = dev_get_drvdata(dev);
3040         int bind = con_is_bound(con->con);
3041
3042         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3043 }
3044
3045 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3046                          char *buf)
3047 {
3048         struct con_driver *con = dev_get_drvdata(dev);
3049
3050         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3051                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3052                          con->desc);
3053
3054 }
3055
3056 static struct device_attribute device_attrs[] = {
3057         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3058         __ATTR(name, S_IRUGO, show_name, NULL),
3059 };
3060
3061 static int vtconsole_init_device(struct con_driver *con)
3062 {
3063         int i;
3064         int error = 0;
3065
3066         con->flag |= CON_DRIVER_FLAG_ATTR;
3067         dev_set_drvdata(con->dev, con);
3068         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3069                 error = device_create_file(con->dev, &device_attrs[i]);
3070                 if (error)
3071                         break;
3072         }
3073
3074         if (error) {
3075                 while (--i >= 0)
3076                         device_remove_file(con->dev, &device_attrs[i]);
3077                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3078         }
3079
3080         return error;
3081 }
3082
3083 static void vtconsole_deinit_device(struct con_driver *con)
3084 {
3085         int i;
3086
3087         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3088                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3089                         device_remove_file(con->dev, &device_attrs[i]);
3090                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3091         }
3092 }
3093
3094 /**
3095  * con_is_bound - checks if driver is bound to the console
3096  * @csw: console driver
3097  *
3098  * RETURNS: zero if unbound, nonzero if bound
3099  *
3100  * Drivers can call this and if zero, they should release
3101  * all resources allocated on con_startup()
3102  */
3103 int con_is_bound(const struct consw *csw)
3104 {
3105         int i, bound = 0;
3106
3107         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3108                 if (con_driver_map[i] == csw) {
3109                         bound = 1;
3110                         break;
3111                 }
3112         }
3113
3114         return bound;
3115 }
3116 EXPORT_SYMBOL(con_is_bound);
3117
3118 /**
3119  * register_con_driver - register console driver to console layer
3120  * @csw: console driver
3121  * @first: the first console to take over, minimum value is 0
3122  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3123  *
3124  * DESCRIPTION: This function registers a console driver which can later
3125  * bind to a range of consoles specified by @first and @last. It will
3126  * also initialize the console driver by calling con_startup().
3127  */
3128 int register_con_driver(const struct consw *csw, int first, int last)
3129 {
3130         struct module *owner = csw->owner;
3131         struct con_driver *con_driver;
3132         const char *desc;
3133         int i, retval = 0;
3134
3135         if (!try_module_get(owner))
3136                 return -ENODEV;
3137
3138         acquire_console_sem();
3139
3140         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3141                 con_driver = &registered_con_driver[i];
3142
3143                 /* already registered */
3144                 if (con_driver->con == csw)
3145                         retval = -EINVAL;
3146         }
3147
3148         if (retval)
3149                 goto err;
3150
3151         desc = csw->con_startup();
3152
3153         if (!desc)
3154                 goto err;
3155
3156         retval = -EINVAL;
3157
3158         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3159                 con_driver = &registered_con_driver[i];
3160
3161                 if (con_driver->con == NULL) {
3162                         con_driver->con = csw;
3163                         con_driver->desc = desc;
3164                         con_driver->node = i;
3165                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3166                                            CON_DRIVER_FLAG_INIT;
3167                         con_driver->first = first;
3168                         con_driver->last = last;
3169                         retval = 0;
3170                         break;
3171                 }
3172         }
3173
3174         if (retval)
3175                 goto err;
3176
3177         con_driver->dev = device_create(vtconsole_class, NULL,
3178                                         MKDEV(0, con_driver->node),
3179                                         "vtcon%i", con_driver->node);
3180
3181         if (IS_ERR(con_driver->dev)) {
3182                 printk(KERN_WARNING "Unable to create device for %s; "
3183                        "errno = %ld\n", con_driver->desc,
3184                        PTR_ERR(con_driver->dev));
3185                 con_driver->dev = NULL;
3186         } else {
3187                 vtconsole_init_device(con_driver);
3188         }
3189
3190 err:
3191         release_console_sem();
3192         module_put(owner);
3193         return retval;
3194 }
3195 EXPORT_SYMBOL(register_con_driver);
3196
3197 /**
3198  * unregister_con_driver - unregister console driver from console layer
3199  * @csw: console driver
3200  *
3201  * DESCRIPTION: All drivers that registers to the console layer must
3202  * call this function upon exit, or if the console driver is in a state
3203  * where it won't be able to handle console services, such as the
3204  * framebuffer console without loaded framebuffer drivers.
3205  *
3206  * The driver must unbind first prior to unregistration.
3207  */
3208 int unregister_con_driver(const struct consw *csw)
3209 {
3210         int i, retval = -ENODEV;
3211
3212         acquire_console_sem();
3213
3214         /* cannot unregister a bound driver */
3215         if (con_is_bound(csw))
3216                 goto err;
3217
3218         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3219                 struct con_driver *con_driver = &registered_con_driver[i];
3220
3221                 if (con_driver->con == csw &&
3222                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3223                         vtconsole_deinit_device(con_driver);
3224                         device_destroy(vtconsole_class,
3225                                        MKDEV(0, con_driver->node));
3226                         con_driver->con = NULL;
3227                         con_driver->desc = NULL;
3228                         con_driver->dev = NULL;
3229                         con_driver->node = 0;
3230                         con_driver->flag = 0;
3231                         con_driver->first = 0;
3232                         con_driver->last = 0;
3233                         retval = 0;
3234                         break;
3235                 }
3236         }
3237 err:
3238         release_console_sem();
3239         return retval;
3240 }
3241 EXPORT_SYMBOL(unregister_con_driver);
3242
3243 /*
3244  *      If we support more console drivers, this function is used
3245  *      when a driver wants to take over some existing consoles
3246  *      and become default driver for newly opened ones.
3247  *
3248  *      take_over_console is basically a register followed by unbind
3249  */
3250 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3251 {
3252         int err;
3253
3254         err = register_con_driver(csw, first, last);
3255
3256         if (!err)
3257                 bind_con_driver(csw, first, last, deflt);
3258
3259         return err;
3260 }
3261
3262 /*
3263  * give_up_console is a wrapper to unregister_con_driver. It will only
3264  * work if driver is fully unbound.
3265  */
3266 void give_up_console(const struct consw *csw)
3267 {
3268         unregister_con_driver(csw);
3269 }
3270
3271 static int __init vtconsole_class_init(void)
3272 {
3273         int i;
3274
3275         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3276         if (IS_ERR(vtconsole_class)) {
3277                 printk(KERN_WARNING "Unable to create vt console class; "
3278                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3279                 vtconsole_class = NULL;
3280         }
3281
3282         /* Add system drivers to sysfs */
3283         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3284                 struct con_driver *con = &registered_con_driver[i];
3285
3286                 if (con->con && !con->dev) {
3287                         con->dev = device_create(vtconsole_class, NULL,
3288                                                  MKDEV(0, con->node),
3289                                                  "vtcon%i", con->node);
3290
3291                         if (IS_ERR(con->dev)) {
3292                                 printk(KERN_WARNING "Unable to create "
3293                                        "device for %s; errno = %ld\n",
3294                                        con->desc, PTR_ERR(con->dev));
3295                                 con->dev = NULL;
3296                         } else {
3297                                 vtconsole_init_device(con);
3298                         }
3299                 }
3300         }
3301
3302         return 0;
3303 }
3304 postcore_initcall(vtconsole_class_init);
3305
3306 #endif
3307
3308 /*
3309  *      Screen blanking
3310  */
3311
3312 static int set_vesa_blanking(char __user *p)
3313 {
3314         unsigned int mode;
3315
3316         if (get_user(mode, p + 1))
3317                 return -EFAULT;
3318
3319         vesa_blank_mode = (mode < 4) ? mode : 0;
3320         return 0;
3321 }
3322
3323 void do_blank_screen(int entering_gfx)
3324 {
3325         struct vc_data *vc = vc_cons[fg_console].d;
3326         int i;
3327
3328         WARN_CONSOLE_UNLOCKED();
3329
3330         if (console_blanked) {
3331                 if (blank_state == blank_vesa_wait) {
3332                         blank_state = blank_off;
3333                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3334                 }
3335                 return;
3336         }
3337         if (blank_state != blank_normal_wait)
3338                 return;
3339         blank_state = blank_off;
3340
3341         /* entering graphics mode? */
3342         if (entering_gfx) {
3343                 hide_cursor(vc);
3344                 save_screen(vc);
3345                 vc->vc_sw->con_blank(vc, -1, 1);
3346                 console_blanked = fg_console + 1;
3347                 set_origin(vc);
3348                 return;
3349         }
3350
3351         /* don't blank graphics */
3352         if (vc->vc_mode != KD_TEXT) {
3353                 console_blanked = fg_console + 1;
3354                 return;
3355         }
3356
3357         hide_cursor(vc);
3358         del_timer_sync(&console_timer);
3359         blank_timer_expired = 0;
3360
3361         save_screen(vc);
3362         /* In case we need to reset origin, blanking hook returns 1 */
3363         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3364         console_blanked = fg_console + 1;
3365         if (i)
3366                 set_origin(vc);
3367
3368         if (console_blank_hook && console_blank_hook(1))
3369                 return;
3370
3371         if (vesa_off_interval && vesa_blank_mode) {
3372                 blank_state = blank_vesa_wait;
3373                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3374         }
3375 }
3376 EXPORT_SYMBOL(do_blank_screen);
3377
3378 /*
3379  * Called by timer as well as from vt_console_driver
3380  */
3381 void do_unblank_screen(int leaving_gfx)
3382 {
3383         struct vc_data *vc;
3384
3385         /* This should now always be called from a "sane" (read: can schedule)
3386          * context for the sake of the low level drivers, except in the special
3387          * case of oops_in_progress
3388          */
3389         if (!oops_in_progress)
3390                 might_sleep();
3391
3392         WARN_CONSOLE_UNLOCKED();
3393
3394         ignore_poke = 0;
3395         if (!console_blanked)
3396                 return;
3397         if (!vc_cons_allocated(fg_console)) {
3398                 /* impossible */
3399                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3400                 return;
3401         }
3402         vc = vc_cons[fg_console].d;
3403         if (vc->vc_mode != KD_TEXT)
3404                 return; /* but leave console_blanked != 0 */
3405
3406         if (blankinterval) {
3407                 mod_timer(&console_timer, jiffies + blankinterval);
3408                 blank_state = blank_normal_wait;
3409         }
3410
3411         console_blanked = 0;
3412         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3413                 /* Low-level driver cannot restore -> do it ourselves */
3414                 update_screen(vc);
3415         if (console_blank_hook)
3416                 console_blank_hook(0);
3417         set_palette(vc);
3418         set_cursor(vc);
3419 }
3420 EXPORT_SYMBOL(do_unblank_screen);
3421
3422 /*
3423  * This is called by the outside world to cause a forced unblank, mostly for
3424  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3425  * call it with 1 as an argument and so force a mode restore... that may kill
3426  * X or at least garbage the screen but would also make the Oops visible...
3427  */
3428 void unblank_screen(void)
3429 {
3430         do_unblank_screen(0);
3431 }
3432
3433 /*
3434  * We defer the timer blanking to work queue so it can take the console mutex
3435  * (console operations can still happen at irq time, but only from printk which
3436  * has the console mutex. Not perfect yet, but better than no locking
3437  */
3438 static void blank_screen_t(unsigned long dummy)
3439 {
3440         if (unlikely(!keventd_up())) {
3441                 mod_timer(&console_timer, jiffies + blankinterval);
3442                 return;
3443         }
3444         blank_timer_expired = 1;
3445         schedule_work(&console_work);
3446 }
3447
3448 void poke_blanked_console(void)
3449 {
3450         WARN_CONSOLE_UNLOCKED();
3451
3452         /* Add this so we quickly catch whoever might call us in a non
3453          * safe context. Nowadays, unblank_screen() isn't to be called in
3454          * atomic contexts and is allowed to schedule (with the special case
3455          * of oops_in_progress, but that isn't of any concern for this
3456          * function. --BenH.
3457          */
3458         might_sleep();
3459
3460         /* This isn't perfectly race free, but a race here would be mostly harmless,
3461          * at worse, we'll do a spurrious blank and it's unlikely
3462          */
3463         del_timer(&console_timer);
3464         blank_timer_expired = 0;
3465
3466         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3467                 return;
3468         if (console_blanked)
3469                 unblank_screen();
3470         else if (blankinterval) {
3471                 mod_timer(&console_timer, jiffies + blankinterval);
3472                 blank_state = blank_normal_wait;
3473         }
3474 }
3475
3476 /*
3477  *      Palettes
3478  */
3479
3480 static void set_palette(struct vc_data *vc)
3481 {
3482         WARN_CONSOLE_UNLOCKED();
3483
3484         if (vc->vc_mode != KD_GRAPHICS)
3485                 vc->vc_sw->con_set_palette(vc, color_table);
3486 }
3487
3488 static int set_get_cmap(unsigned char __user *arg, int set)
3489 {
3490     int i, j, k;
3491
3492     WARN_CONSOLE_UNLOCKED();
3493
3494     for (i = 0; i < 16; i++)
3495         if (set) {
3496             get_user(default_red[i], arg++);
3497             get_user(default_grn[i], arg++);
3498             get_user(default_blu[i], arg++);
3499         } else {
3500             put_user(default_red[i], arg++);
3501             put_user(default_grn[i], arg++);
3502             put_user(default_blu[i], arg++);
3503         }
3504     if (set) {
3505         for (i = 0; i < MAX_NR_CONSOLES; i++)
3506             if (vc_cons_allocated(i)) {
3507                 for (j = k = 0; j < 16; j++) {
3508                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3509                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3510                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3511                 }
3512                 set_palette(vc_cons[i].d);
3513             }
3514     }
3515     return 0;
3516 }
3517
3518 /*
3519  * Load palette into the DAC registers. arg points to a colour
3520  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3521  */
3522
3523 int con_set_cmap(unsigned char __user *arg)
3524 {
3525         int rc;
3526
3527         acquire_console_sem();
3528         rc = set_get_cmap (arg,1);
3529         release_console_sem();
3530
3531         return rc;
3532 }
3533
3534 int con_get_cmap(unsigned char __user *arg)
3535 {
3536         int rc;
3537
3538         acquire_console_sem();
3539         rc = set_get_cmap (arg,0);
3540         release_console_sem();
3541
3542         return rc;
3543 }
3544
3545 void reset_palette(struct vc_data *vc)
3546 {
3547         int j, k;
3548         for (j=k=0; j<16; j++) {
3549                 vc->vc_palette[k++] = default_red[j];
3550                 vc->vc_palette[k++] = default_grn[j];
3551                 vc->vc_palette[k++] = default_blu[j];
3552         }
3553         set_palette(vc);
3554 }
3555
3556 /*
3557  *  Font switching
3558  *
3559  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3560  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3561  *  depending on width) reserved for each character which is kinda wasty, but
3562  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3563  *  is upto the actual low-level console-driver convert data into its favorite
3564  *  format (maybe we should add a `fontoffset' field to the `display'
3565  *  structure so we won't have to convert the fontdata all the time.
3566  *  /Jes
3567  */
3568
3569 #define max_font_size 65536
3570
3571 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3572 {
3573         struct console_font font;
3574         int rc = -EINVAL;
3575         int c;
3576
3577         if (vc->vc_mode != KD_TEXT)
3578                 return -EINVAL;
3579
3580         if (op->data) {
3581                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3582                 if (!font.data)
3583                         return -ENOMEM;
3584         } else
3585                 font.data = NULL;
3586
3587         acquire_console_sem();
3588         if (vc->vc_sw->con_font_get)
3589                 rc = vc->vc_sw->con_font_get(vc, &font);
3590         else
3591                 rc = -ENOSYS;
3592         release_console_sem();
3593
3594         if (rc)
3595                 goto out;
3596
3597         c = (font.width+7)/8 * 32 * font.charcount;
3598
3599         if (op->data && font.charcount > op->charcount)
3600                 rc = -ENOSPC;
3601         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3602                 if (font.width > op->width || font.height > op->height)
3603                         rc = -ENOSPC;
3604         } else {
3605                 if (font.width != 8)
3606                         rc = -EIO;
3607                 else if ((op->height && font.height > op->height) ||
3608                          font.height > 32)
3609                         rc = -ENOSPC;
3610         }
3611         if (rc)
3612                 goto out;
3613
3614         op->height = font.height;
3615         op->width = font.width;
3616         op->charcount = font.charcount;
3617
3618         if (op->data && copy_to_user(op->data, font.data, c))
3619                 rc = -EFAULT;
3620
3621 out:
3622         kfree(font.data);
3623         return rc;
3624 }
3625
3626 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3627 {
3628         struct console_font font;
3629         int rc = -EINVAL;
3630         int size;
3631
3632         if (vc->vc_mode != KD_TEXT)
3633                 return -EINVAL;
3634         if (!op->data)
3635                 return -EINVAL;
3636         if (op->charcount > 512)
3637                 return -EINVAL;
3638         if (!op->height) {              /* Need to guess font height [compat] */
3639                 int h, i;
3640                 u8 __user *charmap = op->data;
3641                 u8 tmp;
3642
3643                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3644                    so that we can get rid of this soon */
3645                 if (!(op->flags & KD_FONT_FLAG_OLD))
3646                         return -EINVAL;
3647                 for (h = 32; h > 0; h--)
3648                         for (i = 0; i < op->charcount; i++) {
3649                                 if (get_user(tmp, &charmap[32*i+h-1]))
3650                                         return -EFAULT;
3651                                 if (tmp)
3652                                         goto nonzero;
3653                         }
3654                 return -EINVAL;
3655         nonzero:
3656                 op->height = h;
3657         }
3658         if (op->width <= 0 || op->width > 32 || op->height > 32)
3659                 return -EINVAL;
3660         size = (op->width+7)/8 * 32 * op->charcount;
3661         if (size > max_font_size)
3662                 return -ENOSPC;
3663         font.charcount = op->charcount;
3664         font.height = op->height;
3665         font.width = op->width;
3666         font.data = kmalloc(size, GFP_KERNEL);
3667         if (!font.data)
3668                 return -ENOMEM;
3669         if (copy_from_user(font.data, op->data, size)) {
3670                 kfree(font.data);
3671                 return -EFAULT;
3672         }
3673         acquire_console_sem();
3674         if (vc->vc_sw->con_font_set)
3675                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3676         else
3677                 rc = -ENOSYS;
3678         release_console_sem();
3679         kfree(font.data);
3680         return rc;
3681 }
3682
3683 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3684 {
3685         struct console_font font = {.width = op->width, .height = op->height};
3686         char name[MAX_FONT_NAME];
3687         char *s = name;
3688         int rc;
3689
3690         if (vc->vc_mode != KD_TEXT)
3691                 return -EINVAL;
3692
3693         if (!op->data)
3694                 s = NULL;
3695         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3696                 return -EFAULT;
3697         else
3698                 name[MAX_FONT_NAME - 1] = 0;
3699
3700         acquire_console_sem();
3701         if (vc->vc_sw->con_font_default)
3702                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3703         else
3704                 rc = -ENOSYS;
3705         release_console_sem();
3706         if (!rc) {
3707                 op->width = font.width;
3708                 op->height = font.height;
3709         }
3710         return rc;
3711 }
3712
3713 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3714 {
3715         int con = op->height;
3716         int rc;
3717
3718         if (vc->vc_mode != KD_TEXT)
3719                 return -EINVAL;
3720
3721         acquire_console_sem();
3722         if (!vc->vc_sw->con_font_copy)
3723                 rc = -ENOSYS;
3724         else if (con < 0 || !vc_cons_allocated(con))
3725                 rc = -ENOTTY;
3726         else if (con == vc->vc_num)     /* nothing to do */
3727                 rc = 0;
3728         else
3729                 rc = vc->vc_sw->con_font_copy(vc, con);
3730         release_console_sem();
3731         return rc;
3732 }
3733
3734 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3735 {
3736         switch (op->op) {
3737         case KD_FONT_OP_SET:
3738                 return con_font_set(vc, op);
3739         case KD_FONT_OP_GET:
3740                 return con_font_get(vc, op);
3741         case KD_FONT_OP_SET_DEFAULT:
3742                 return con_font_default(vc, op);
3743         case KD_FONT_OP_COPY:
3744                 return con_font_copy(vc, op);
3745         }
3746         return -ENOSYS;
3747 }
3748
3749 /*
3750  *      Interface exported to selection and vcs.
3751  */
3752
3753 /* used by selection */
3754 u16 screen_glyph(struct vc_data *vc, int offset)
3755 {
3756         u16 w = scr_readw(screenpos(vc, offset, 1));
3757         u16 c = w & 0xff;
3758
3759         if (w & vc->vc_hi_font_mask)
3760                 c |= 0x100;
3761         return c;
3762 }
3763
3764 /* used by vcs - note the word offset */
3765 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3766 {
3767         return screenpos(vc, 2 * w_offset, viewed);
3768 }
3769
3770 void getconsxy(struct vc_data *vc, unsigned char *p)
3771 {
3772         p[0] = vc->vc_x;
3773         p[1] = vc->vc_y;
3774 }
3775
3776 void putconsxy(struct vc_data *vc, unsigned char *p)
3777 {
3778         hide_cursor(vc);
3779         gotoxy(vc, p[0], p[1]);
3780         set_cursor(vc);
3781 }
3782
3783 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3784 {
3785         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3786                 return softcursor_original;
3787         return scr_readw(org);
3788 }
3789
3790 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3791 {
3792         scr_writew(val, org);
3793         if ((unsigned long)org == vc->vc_pos) {
3794                 softcursor_original = -1;
3795                 add_softcursor(vc);
3796         }
3797 }
3798
3799 /*
3800  *      Visible symbols for modules
3801  */
3802
3803 EXPORT_SYMBOL(color_table);
3804 EXPORT_SYMBOL(default_red);
3805 EXPORT_SYMBOL(default_grn);
3806 EXPORT_SYMBOL(default_blu);
3807 EXPORT_SYMBOL(update_region);
3808 EXPORT_SYMBOL(redraw_screen);
3809 EXPORT_SYMBOL(vc_resize);
3810 EXPORT_SYMBOL(vc_lock_resize);
3811 EXPORT_SYMBOL(fg_console);
3812 EXPORT_SYMBOL(console_blank_hook);
3813 EXPORT_SYMBOL(console_blanked);
3814 EXPORT_SYMBOL(vc_cons);
3815 #ifndef VT_SINGLE_DRIVER
3816 EXPORT_SYMBOL(take_over_console);
3817 EXPORT_SYMBOL(give_up_console);
3818 #endif