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