drivers/char/vt.c

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