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