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 #include <linux/kdb.h>
 108 #include <linux/ctype.h>
 109
 110 #define MAX_NR_CON_DRIVER 16
 111
 112 #define CON_DRIVER_FLAG_MODULE 1
 113 #define CON_DRIVER_FLAG_INIT   2
 114 #define CON_DRIVER_FLAG_ATTR   4
 115
 116 struct con_driver {
 117         const struct consw *con;
 118         const char *desc;
 119         struct device *dev;
 120         int node;
 121         int first;
 122         int last;
 123         int flag;
 124 };
 125
 126 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 127 const struct consw *conswitchp;
 128
 129 /* A bitmap for codes <32. A bit of 1 indicates that the code
 130  * corresponding to that bit number invokes some special action
 131  * (such as cursor movement) and should not be displayed as a
 132  * glyph unless the disp_ctrl mode is explicitly enabled.
 133  */
 134 #define CTRL_ACTION 0x0d00ff81
 135 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 136
 137 /*
 138  * Here is the default bell parameters: 750HZ, 1/8th of a second
 139  */
 140 #define DEFAULT_BELL_PITCH      750
 141 #define DEFAULT_BELL_DURATION   (HZ/8)
 142
 143 struct vc vc_cons [MAX_NR_CONSOLES];
 144
 145 #ifndef VT_SINGLE_DRIVER
 146 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 147 #endif
 148
 149 static int con_open(struct tty_struct *, struct file *);
 150 static void vc_init(struct vc_data *vc, unsigned int rows,
 151                     unsigned int cols, int do_clear);
 152 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 153 static void save_cur(struct vc_data *vc);
 154 static void reset_terminal(struct vc_data *vc, int do_clear);
 155 static void con_flush_chars(struct tty_struct *tty);
 156 static int set_vesa_blanking(char __user *p);
 157 static void set_cursor(struct vc_data *vc);
 158 static void hide_cursor(struct vc_data *vc);
 159 static void console_callback(struct work_struct *ignored);
 160 static void blank_screen_t(unsigned long dummy);
 161 static void set_palette(struct vc_data *vc);
 162
 163 static int printable;           /* Is console ready for printing? */
 164 int default_utf8 = true;
 165 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 166 int global_cursor_default = -1;
 167 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 168
 169 static int cur_default = CUR_DEFAULT;
 170 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 171
 172 /*
 173  * ignore_poke: don't unblank the screen when things are typed.  This is
 174  * mainly for the privacy of braille terminal users.
 175  */
 176 static int ignore_poke;
 177
 178 int do_poke_blanked_console;
 179 int console_blanked;
 180
 181 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 182 static int vesa_off_interval;
 183 static int blankinterval = 10*60;
 184 core_param(consoleblank, blankinterval, int, 0444);
 185
 186 static DECLARE_WORK(console_work, console_callback);
 187
 188 /*
 189  * fg_console is the current virtual console,
 190  * last_console is the last used one,
 191  * want_console is the console we want to switch to,
 192  * saved_* variants are for save/restore around kernel debugger enter/leave
 193  */
 194 int fg_console;
 195 int last_console;
 196 int want_console = -1;
 197 static int saved_fg_console;
 198 static int saved_last_console;
 199 static int saved_want_console;
 200 static int saved_vc_mode;
 201 static int saved_console_blanked;
 202
 203 /*
 204  * For each existing display, we have a pointer to console currently visible
 205  * on that display, allowing consoles other than fg_console to be refreshed
 206  * appropriately. Unless the low-level driver supplies its own display_fg
 207  * variable, we use this one for the "master display".
 208  */
 209 static struct vc_data *master_display_fg;
 210
 211 /*
 212  * Unfortunately, we need to delay tty echo when we're currently writing to the
 213  * console since the code is (and always was) not re-entrant, so we schedule
 214  * all flip requests to process context with schedule-task() and run it from
 215  * console_callback().
 216  */
 217
 218 /*
 219  * For the same reason, we defer scrollback to the console callback.
 220  */
 221 static int scrollback_delta;
 222
 223 /*
 224  * Hook so that the power management routines can (un)blank
 225  * the console on our behalf.
 226  */
 227 int (*console_blank_hook)(int);
 228
 229 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 230 static int blank_state;
 231 static int blank_timer_expired;
 232 enum {
 233         blank_off = 0,
 234         blank_normal_wait,
 235         blank_vesa_wait,
 236 };
 237
 238 /*
 239  * Notifier list for console events.
 240  */
 241 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 242
 243 int register_vt_notifier(struct notifier_block *nb)
 244 {
 245         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 246 }
 247 EXPORT_SYMBOL_GPL(register_vt_notifier);
 248
 249 int unregister_vt_notifier(struct notifier_block *nb)
 250 {
 251         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 252 }
 253 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 254
 255 static void notify_write(struct vc_data *vc, unsigned int unicode)
 256 {
 257         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 258         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 259 }
 260
 261 static void notify_update(struct vc_data *vc)
 262 {
 263         struct vt_notifier_param param = { .vc = vc };
 264         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 265 }
 266 /*
 267  *      Low-Level Functions
 268  */
 269
 270 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 271
 272 #ifdef VT_BUF_VRAM_ONLY
 273 #define DO_UPDATE(vc)   0
 274 #else
 275 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 276 #endif
 277
 278 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 279 {
 280         unsigned short *p;
 281
 282         if (!viewed)
 283                 p = (unsigned short *)(vc->vc_origin + offset);
 284         else if (!vc->vc_sw->con_screen_pos)
 285                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 286         else
 287                 p = vc->vc_sw->con_screen_pos(vc, offset);
 288         return p;
 289 }
 290
 291 /* Called  from the keyboard irq path.. */
 292 static inline void scrolldelta(int lines)
 293 {
 294         /* FIXME */
 295         /* scrolldelta needs some kind of consistency lock, but the BKL was
 296            and still is not protecting versus the scheduled back end */
 297         scrollback_delta += lines;
 298         schedule_console_callback();
 299 }
 300
 301 void schedule_console_callback(void)
 302 {
 303         schedule_work(&console_work);
 304 }
 305
 306 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 307 {
 308         unsigned short *d, *s;
 309
 310         if (t+nr >= b)
 311                 nr = b - t - 1;
 312         if (b > vc->vc_rows || t >= b || nr < 1)
 313                 return;
 314         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 315                 return;
 316         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 317         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 318         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 319         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 320                     vc->vc_size_row * nr);
 321 }
 322
 323 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 324 {
 325         unsigned short *s;
 326         unsigned int step;
 327
 328         if (t+nr >= b)
 329                 nr = b - t - 1;
 330         if (b > vc->vc_rows || t >= b || nr < 1)
 331                 return;
 332         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 333                 return;
 334         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 335         step = vc->vc_cols * nr;
 336         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 337         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 338 }
 339
 340 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 341 {
 342 #ifndef VT_BUF_VRAM_ONLY
 343         unsigned int xx, yy, offset;
 344         u16 *p;
 345
 346         p = (u16 *) start;
 347         if (!vc->vc_sw->con_getxy) {
 348                 offset = (start - vc->vc_origin) / 2;
 349                 xx = offset % vc->vc_cols;
 350                 yy = offset / vc->vc_cols;
 351         } else {
 352                 int nxx, nyy;
 353                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 354                 xx = nxx; yy = nyy;
 355         }
 356         for(;;) {
 357                 u16 attrib = scr_readw(p) & 0xff00;
 358                 int startx = xx;
 359                 u16 *q = p;
 360                 while (xx < vc->vc_cols && count) {
 361                         if (attrib != (scr_readw(p) & 0xff00)) {
 362                                 if (p > q)
 363                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 364                                 startx = xx;
 365                                 q = p;
 366                                 attrib = scr_readw(p) & 0xff00;
 367                         }
 368                         p++;
 369                         xx++;
 370                         count--;
 371                 }
 372                 if (p > q)
 373                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 374                 if (!count)
 375                         break;
 376                 xx = 0;
 377                 yy++;
 378                 if (vc->vc_sw->con_getxy) {
 379                         p = (u16 *)start;
 380                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 381                 }
 382         }
 383 #endif
 384 }
 385
 386 void update_region(struct vc_data *vc, unsigned long start, int count)
 387 {
 388         WARN_CONSOLE_UNLOCKED();
 389
 390         if (DO_UPDATE(vc)) {
 391                 hide_cursor(vc);
 392                 do_update_region(vc, start, count);
 393                 set_cursor(vc);
 394         }
 395 }
 396
 397 /* Structure of attributes is hardware-dependent */
 398
 399 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 400     u8 _underline, u8 _reverse, u8 _italic)
 401 {
 402         if (vc->vc_sw->con_build_attr)
 403                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 404                        _blink, _underline, _reverse, _italic);
 405
 406 #ifndef VT_BUF_VRAM_ONLY
 407 /*
 408  * ++roman: I completely changed the attribute format for monochrome
 409  * mode (!can_do_color). The formerly used MDA (monochrome display
 410  * adapter) format didn't allow the combination of certain effects.
 411  * Now the attribute is just a bit vector:
 412  *  Bit 0..1: intensity (0..2)
 413  *  Bit 2   : underline
 414  *  Bit 3   : reverse
 415  *  Bit 7   : blink
 416  */
 417         {
 418         u8 a = _color;
 419         if (!vc->vc_can_do_color)
 420                 return _intensity |
 421                        (_italic ? 2 : 0) |
 422                        (_underline ? 4 : 0) |
 423                        (_reverse ? 8 : 0) |
 424                        (_blink ? 0x80 : 0);
 425         if (_italic)
 426                 a = (a & 0xF0) | vc->vc_itcolor;
 427         else if (_underline)
 428                 a = (a & 0xf0) | vc->vc_ulcolor;
 429         else if (_intensity == 0)
 430                 a = (a & 0xf0) | vc->vc_ulcolor;
 431         if (_reverse)
 432                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 433         if (_blink)
 434                 a ^= 0x80;
 435         if (_intensity == 2)
 436                 a ^= 0x08;
 437         if (vc->vc_hi_font_mask == 0x100)
 438                 a <<= 1;
 439         return a;
 440         }
 441 #else
 442         return 0;
 443 #endif
 444 }
 445
 446 static void update_attr(struct vc_data *vc)
 447 {
 448         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 449                       vc->vc_blink, vc->vc_underline,
 450                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 451         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 452 }
 453
 454 /* Note: inverting the screen twice should revert to the original state */
 455 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 456 {
 457         unsigned short *p;
 458
 459         WARN_CONSOLE_UNLOCKED();
 460
 461         count /= 2;
 462         p = screenpos(vc, offset, viewed);
 463         if (vc->vc_sw->con_invert_region)
 464                 vc->vc_sw->con_invert_region(vc, p, count);
 465 #ifndef VT_BUF_VRAM_ONLY
 466         else {
 467                 u16 *q = p;
 468                 int cnt = count;
 469                 u16 a;
 470
 471                 if (!vc->vc_can_do_color) {
 472                         while (cnt--) {
 473                             a = scr_readw(q);
 474                             a ^= 0x0800;
 475                             scr_writew(a, q);
 476                             q++;
 477                         }
 478                 } else if (vc->vc_hi_font_mask == 0x100) {
 479                         while (cnt--) {
 480                                 a = scr_readw(q);
 481                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 482                                 scr_writew(a, q);
 483                                 q++;
 484                         }
 485                 } else {
 486                         while (cnt--) {
 487                                 a = scr_readw(q);
 488                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 489                                 scr_writew(a, q);
 490                                 q++;
 491                         }
 492                 }
 493         }
 494 #endif
 495         if (DO_UPDATE(vc))
 496                 do_update_region(vc, (unsigned long) p, count);
 497 }
 498
 499 /* used by selection: complement pointer position */
 500 void complement_pos(struct vc_data *vc, int offset)
 501 {
 502         static int old_offset = -1;
 503         static unsigned short old;
 504         static unsigned short oldx, oldy;
 505
 506         WARN_CONSOLE_UNLOCKED();
 507
 508         if (old_offset != -1 && old_offset >= 0 &&
 509             old_offset < vc->vc_screenbuf_size) {
 510                 scr_writew(old, screenpos(vc, old_offset, 1));
 511                 if (DO_UPDATE(vc))
 512                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 513         }
 514
 515         old_offset = offset;
 516
 517         if (offset != -1 && offset >= 0 &&
 518             offset < vc->vc_screenbuf_size) {
 519                 unsigned short new;
 520                 unsigned short *p;
 521                 p = screenpos(vc, offset, 1);
 522                 old = scr_readw(p);
 523                 new = old ^ vc->vc_complement_mask;
 524                 scr_writew(new, p);
 525                 if (DO_UPDATE(vc)) {
 526                         oldx = (offset >> 1) % vc->vc_cols;
 527                         oldy = (offset >> 1) / vc->vc_cols;
 528                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 529                 }
 530         }
 531
 532 }
 533
 534 static void insert_char(struct vc_data *vc, unsigned int nr)
 535 {
 536         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 537
 538         p = q + vc->vc_cols - nr - vc->vc_x;
 539         while (--p >= q)
 540                 scr_writew(scr_readw(p), p + nr);
 541         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 542         vc->vc_need_wrap = 0;
 543         if (DO_UPDATE(vc)) {
 544                 unsigned short oldattr = vc->vc_attr;
 545                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 546                                      vc->vc_cols - vc->vc_x - nr);
 547                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 548                 while (nr--)
 549                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 550                 vc->vc_attr = oldattr;
 551         }
 552 }
 553
 554 static void delete_char(struct vc_data *vc, unsigned int nr)
 555 {
 556         unsigned int i = vc->vc_x;
 557         unsigned short *p = (unsigned short *)vc->vc_pos;
 558
 559         while (++i <= vc->vc_cols - nr) {
 560                 scr_writew(scr_readw(p+nr), p);
 561                 p++;
 562         }
 563         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 564         vc->vc_need_wrap = 0;
 565         if (DO_UPDATE(vc)) {
 566                 unsigned short oldattr = vc->vc_attr;
 567                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 568                                      vc->vc_cols - vc->vc_x - nr);
 569                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 570                 while (nr--)
 571                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 572                                      vc->vc_cols - 1 - nr);
 573                 vc->vc_attr = oldattr;
 574         }
 575 }
 576
 577 static int softcursor_original;
 578
 579 static void add_softcursor(struct vc_data *vc)
 580 {
 581         int i = scr_readw((u16 *) vc->vc_pos);
 582         u32 type = vc->vc_cursor_type;
 583
 584         if (! (type & 0x10)) return;
 585         if (softcursor_original != -1) return;
 586         softcursor_original = i;
 587         i |= ((type >> 8) & 0xff00 );
 588         i ^= ((type) & 0xff00 );
 589         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 590         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 591         scr_writew(i, (u16 *) vc->vc_pos);
 592         if (DO_UPDATE(vc))
 593                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 594 }
 595
 596 static void hide_softcursor(struct vc_data *vc)
 597 {
 598         if (softcursor_original != -1) {
 599                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 600                 if (DO_UPDATE(vc))
 601                         vc->vc_sw->con_putc(vc, softcursor_original,
 602                                         vc->vc_y, vc->vc_x);
 603                 softcursor_original = -1;
 604         }
 605 }
 606
 607 static void hide_cursor(struct vc_data *vc)
 608 {
 609         if (vc == sel_cons)
 610                 clear_selection();
 611         vc->vc_sw->con_cursor(vc, CM_ERASE);
 612         hide_softcursor(vc);
 613 }
 614
 615 static void set_cursor(struct vc_data *vc)
 616 {
 617         if (!IS_FG(vc) || console_blanked ||
 618             vc->vc_mode == KD_GRAPHICS)
 619                 return;
 620         if (vc->vc_deccm) {
 621                 if (vc == sel_cons)
 622                         clear_selection();
 623                 add_softcursor(vc);
 624                 if ((vc->vc_cursor_type & 0x0f) != 1)
 625                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 626         } else
 627                 hide_cursor(vc);
 628 }
 629
 630 static void set_origin(struct vc_data *vc)
 631 {
 632         WARN_CONSOLE_UNLOCKED();
 633
 634         if (!CON_IS_VISIBLE(vc) ||
 635             !vc->vc_sw->con_set_origin ||
 636             !vc->vc_sw->con_set_origin(vc))
 637                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 638         vc->vc_visible_origin = vc->vc_origin;
 639         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 640         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 641 }
 642
 643 static inline void save_screen(struct vc_data *vc)
 644 {
 645         WARN_CONSOLE_UNLOCKED();
 646
 647         if (vc->vc_sw->con_save_screen)
 648                 vc->vc_sw->con_save_screen(vc);
 649 }
 650
 651 /*
 652  *      Redrawing of screen
 653  */
 654
 655 static void clear_buffer_attributes(struct vc_data *vc)
 656 {
 657         unsigned short *p = (unsigned short *)vc->vc_origin;
 658         int count = vc->vc_screenbuf_size / 2;
 659         int mask = vc->vc_hi_font_mask | 0xff;
 660
 661         for (; count > 0; count--, p++) {
 662                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 663         }
 664 }
 665
 666 void redraw_screen(struct vc_data *vc, int is_switch)
 667 {
 668         int redraw = 0;
 669
 670         WARN_CONSOLE_UNLOCKED();
 671
 672         if (!vc) {
 673                 /* strange ... */
 674                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 675                 return;
 676         }
 677
 678         if (is_switch) {
 679                 struct vc_data *old_vc = vc_cons[fg_console].d;
 680                 if (old_vc == vc)
 681                         return;
 682                 if (!CON_IS_VISIBLE(vc))
 683                         redraw = 1;
 684                 *vc->vc_display_fg = vc;
 685                 fg_console = vc->vc_num;
 686                 hide_cursor(old_vc);
 687                 if (!CON_IS_VISIBLE(old_vc)) {
 688                         save_screen(old_vc);
 689                         set_origin(old_vc);
 690                 }
 691         } else {
 692                 hide_cursor(vc);
 693                 redraw = 1;
 694         }
 695
 696         if (redraw) {
 697                 int update;
 698                 int old_was_color = vc->vc_can_do_color;
 699
 700                 set_origin(vc);
 701                 update = vc->vc_sw->con_switch(vc);
 702                 set_palette(vc);
 703                 /*
 704                  * If console changed from mono<->color, the best we can do
 705                  * is to clear the buffer attributes. As it currently stands,
 706                  * rebuilding new attributes from the old buffer is not doable
 707                  * without overly complex code.
 708                  */
 709                 if (old_was_color != vc->vc_can_do_color) {
 710                         update_attr(vc);
 711                         clear_buffer_attributes(vc);
 712                 }
 713
 714                 /* Forcibly update if we're panicing */
 715                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 716                     vt_force_oops_output(vc))
 717                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 718         }
 719         set_cursor(vc);
 720         if (is_switch) {
 721                 set_leds();
 722                 compute_shiftstate();
 723                 notify_update(vc);
 724         }
 725 }
 726
 727 /*
 728  *      Allocation, freeing and resizing of VTs.
 729  */
 730
 731 int vc_cons_allocated(unsigned int i)
 732 {
 733         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 734 }
 735
 736 static void visual_init(struct vc_data *vc, int num, int init)
 737 {
 738         /* ++Geert: vc->vc_sw->con_init determines console size */
 739         if (vc->vc_sw)
 740                 module_put(vc->vc_sw->owner);
 741         vc->vc_sw = conswitchp;
 742 #ifndef VT_SINGLE_DRIVER
 743         if (con_driver_map[num])
 744                 vc->vc_sw = con_driver_map[num];
 745 #endif
 746         __module_get(vc->vc_sw->owner);
 747         vc->vc_num = num;
 748         vc->vc_display_fg = &master_display_fg;
 749         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 750         vc->vc_uni_pagedir = 0;
 751         vc->vc_hi_font_mask = 0;
 752         vc->vc_complement_mask = 0;
 753         vc->vc_can_do_color = 0;
 754         vc->vc_panic_force_write = false;
 755         vc->vc_sw->con_init(vc, init);
 756         if (!vc->vc_complement_mask)
 757                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 758         vc->vc_s_complement_mask = vc->vc_complement_mask;
 759         vc->vc_size_row = vc->vc_cols << 1;
 760         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 761 }
 762
 763 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 764 {
 765         WARN_CONSOLE_UNLOCKED();
 766
 767         if (currcons >= MAX_NR_CONSOLES)
 768                 return -ENXIO;
 769         if (!vc_cons[currcons].d) {
 770             struct vc_data *vc;
 771             struct vt_notifier_param param;
 772
 773             /* prevent users from taking too much memory */
 774             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 775               return -EPERM;
 776
 777             /* due to the granularity of kmalloc, we waste some memory here */
 778             /* the alloc is done in two steps, to optimize the common situation
 779                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 780             /* although the numbers above are not valid since long ago, the
 781                point is still up-to-date and the comment still has its value
 782                even if only as a historical artifact.  --mj, July 1998 */
 783             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 784             if (!vc)
 785                 return -ENOMEM;
 786             vc_cons[currcons].d = vc;
 787             tty_port_init(&vc->port);
 788             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 789             visual_init(vc, currcons, 1);
 790             if (!*vc->vc_uni_pagedir_loc)
 791                 con_set_default_unimap(vc);
 792             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 793             if (!vc->vc_screenbuf) {
 794                 kfree(vc);
 795                 vc_cons[currcons].d = NULL;
 796                 return -ENOMEM;
 797             }
 798
 799             /* If no drivers have overridden us and the user didn't pass a
 800                boot option, default to displaying the cursor */
 801             if (global_cursor_default == -1)
 802                     global_cursor_default = 1;
 803
 804             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 805             vcs_make_sysfs(currcons);
 806             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 807         }
 808         return 0;
 809 }
 810
 811 static inline int resize_screen(struct vc_data *vc, int width, int height,
 812                                 int user)
 813 {
 814         /* Resizes the resolution of the display adapater */
 815         int err = 0;
 816
 817         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 818                 err = vc->vc_sw->con_resize(vc, width, height, user);
 819
 820         return err;
 821 }
 822
 823 /*
 824  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 825  * [this is to be used together with some user program
 826  * like resize that changes the hardware videomode]
 827  */
 828 #define VC_RESIZE_MAXCOL (32767)
 829 #define VC_RESIZE_MAXROW (32767)
 830
 831 /**
 832  *      vc_do_resize    -       resizing method for the tty
 833  *      @tty: tty being resized
 834  *      @real_tty: real tty (different to tty if a pty/tty pair)
 835  *      @vc: virtual console private data
 836  *      @cols: columns
 837  *      @lines: lines
 838  *
 839  *      Resize a virtual console, clipping according to the actual constraints.
 840  *      If the caller passes a tty structure then update the termios winsize
 841  *      information and perform any necessary signal handling.
 842  *
 843  *      Caller must hold the console semaphore. Takes the termios mutex and
 844  *      ctrl_lock of the tty IFF a tty is passed.
 845  */
 846
 847 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 848                                 unsigned int cols, unsigned int lines)
 849 {
 850         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 851         unsigned long end;
 852         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 853         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 854         unsigned int user;
 855         unsigned short *newscreen;
 856
 857         WARN_CONSOLE_UNLOCKED();
 858
 859         if (!vc)
 860                 return -ENXIO;
 861
 862         user = vc->vc_resize_user;
 863         vc->vc_resize_user = 0;
 864
 865         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 866                 return -EINVAL;
 867
 868         new_cols = (cols ? cols : vc->vc_cols);
 869         new_rows = (lines ? lines : vc->vc_rows);
 870         new_row_size = new_cols << 1;
 871         new_screen_size = new_row_size * new_rows;
 872
 873         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 874                 return 0;
 875
 876         newscreen = kmalloc(new_screen_size, GFP_USER);
 877         if (!newscreen)
 878                 return -ENOMEM;
 879
 880         old_rows = vc->vc_rows;
 881         old_cols = vc->vc_cols;
 882         old_row_size = vc->vc_size_row;
 883         old_screen_size = vc->vc_screenbuf_size;
 884
 885         err = resize_screen(vc, new_cols, new_rows, user);
 886         if (err) {
 887                 kfree(newscreen);
 888                 return err;
 889         }
 890
 891         vc->vc_rows = new_rows;
 892         vc->vc_cols = new_cols;
 893         vc->vc_size_row = new_row_size;
 894         vc->vc_screenbuf_size = new_screen_size;
 895
 896         rlth = min(old_row_size, new_row_size);
 897         rrem = new_row_size - rlth;
 898         old_origin = vc->vc_origin;
 899         new_origin = (long) newscreen;
 900         new_scr_end = new_origin + new_screen_size;
 901
 902         if (vc->vc_y > new_rows) {
 903                 if (old_rows - vc->vc_y < new_rows) {
 904                         /*
 905                          * Cursor near the bottom, copy contents from the
 906                          * bottom of buffer
 907                          */
 908                         old_origin += (old_rows - new_rows) * old_row_size;
 909                 } else {
 910                         /*
 911                          * Cursor is in no man's land, copy 1/2 screenful
 912                          * from the top and bottom of cursor position
 913                          */
 914                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 915                 }
 916         }
 917
 918         end = old_origin + old_row_size * min(old_rows, new_rows);
 919
 920         update_attr(vc);
 921
 922         while (old_origin < end) {
 923                 scr_memcpyw((unsigned short *) new_origin,
 924                             (unsigned short *) old_origin, rlth);
 925                 if (rrem)
 926                         scr_memsetw((void *)(new_origin + rlth),
 927                                     vc->vc_video_erase_char, rrem);
 928                 old_origin += old_row_size;
 929                 new_origin += new_row_size;
 930         }
 931         if (new_scr_end > new_origin)
 932                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 933                             new_scr_end - new_origin);
 934         kfree(vc->vc_screenbuf);
 935         vc->vc_screenbuf = newscreen;
 936         vc->vc_screenbuf_size = new_screen_size;
 937         set_origin(vc);
 938
 939         /* do part of a reset_terminal() */
 940         vc->vc_top = 0;
 941         vc->vc_bottom = vc->vc_rows;
 942         gotoxy(vc, vc->vc_x, vc->vc_y);
 943         save_cur(vc);
 944
 945         if (tty) {
 946                 /* Rewrite the requested winsize data with the actual
 947                    resulting sizes */
 948                 struct winsize ws;
 949                 memset(&ws, 0, sizeof(ws));
 950                 ws.ws_row = vc->vc_rows;
 951                 ws.ws_col = vc->vc_cols;
 952                 ws.ws_ypixel = vc->vc_scan_lines;
 953                 tty_do_resize(tty, &ws);
 954         }
 955
 956         if (CON_IS_VISIBLE(vc))
 957                 update_screen(vc);
 958         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 959         return err;
 960 }
 961
 962 /**
 963  *      vc_resize               -       resize a VT
 964  *      @vc: virtual console
 965  *      @cols: columns
 966  *      @rows: rows
 967  *
 968  *      Resize a virtual console as seen from the console end of things. We
 969  *      use the common vc_do_resize methods to update the structures. The
 970  *      caller must hold the console sem to protect console internals and
 971  *      vc->port.tty
 972  */
 973
 974 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 975 {
 976         return vc_do_resize(vc->port.tty, vc, cols, rows);
 977 }
 978
 979 /**
 980  *      vt_resize               -       resize a VT
 981  *      @tty: tty to resize
 982  *      @ws: winsize attributes
 983  *
 984  *      Resize a virtual terminal. This is called by the tty layer as we
 985  *      register our own handler for resizing. The mutual helper does all
 986  *      the actual work.
 987  *
 988  *      Takes the console sem and the called methods then take the tty
 989  *      termios_mutex and the tty ctrl_lock in that order.
 990  */
 991 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 992 {
 993         struct vc_data *vc = tty->driver_data;
 994         int ret;
 995
 996         acquire_console_sem();
 997         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 998         release_console_sem();
 999         return ret;
1000 }
1001
1002 void vc_deallocate(unsigned int currcons)
1003 {
1004         WARN_CONSOLE_UNLOCKED();
1005
1006         if (vc_cons_allocated(currcons)) {
1007                 struct vc_data *vc = vc_cons[currcons].d;
1008                 struct vt_notifier_param param = { .vc = vc };
1009
1010                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1011                 vcs_remove_sysfs(currcons);
1012                 vc->vc_sw->con_deinit(vc);
1013                 put_pid(vc->vt_pid);
1014                 module_put(vc->vc_sw->owner);
1015                 kfree(vc->vc_screenbuf);
1016                 if (currcons >= MIN_NR_CONSOLES)
1017                         kfree(vc);
1018                 vc_cons[currcons].d = NULL;
1019         }
1020 }
1021
1022 /*
1023  *      VT102 emulator
1024  */
1025
1026 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1027 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1028 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1029
1030 #define decarm          VC_REPEAT
1031 #define decckm          VC_CKMODE
1032 #define kbdapplic       VC_APPLIC
1033 #define lnm             VC_CRLF
1034
1035 /*
1036  * this is what the terminal answers to a ESC-Z or csi0c query.
1037  */
1038 #define VT100ID "\033[?1;2c"
1039 #define VT102ID "\033[?6c"
1040
1041 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1042                                        8,12,10,14, 9,13,11,15 };
1043
1044 /* the default colour table, for VGA+ colour systems */
1045 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1046     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1047 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1048     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1049 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1050     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1051
1052 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1053 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1054 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1055
1056 /*
1057  * gotoxy() must verify all boundaries, because the arguments
1058  * might also be negative. If the given position is out of
1059  * bounds, the cursor is placed at the nearest margin.
1060  */
1061 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1062 {
1063         int min_y, max_y;
1064
1065         if (new_x < 0)
1066                 vc->vc_x = 0;
1067         else {
1068                 if (new_x >= vc->vc_cols)
1069                         vc->vc_x = vc->vc_cols - 1;
1070                 else
1071                         vc->vc_x = new_x;
1072         }
1073
1074         if (vc->vc_decom) {
1075                 min_y = vc->vc_top;
1076                 max_y = vc->vc_bottom;
1077         } else {
1078                 min_y = 0;
1079                 max_y = vc->vc_rows;
1080         }
1081         if (new_y < min_y)
1082                 vc->vc_y = min_y;
1083         else if (new_y >= max_y)
1084                 vc->vc_y = max_y - 1;
1085         else
1086                 vc->vc_y = new_y;
1087         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1088         vc->vc_need_wrap = 0;
1089 }
1090
1091 /* for absolute user moves, when decom is set */
1092 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1093 {
1094         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1095 }
1096
1097 void scrollback(struct vc_data *vc, int lines)
1098 {
1099         if (!lines)
1100                 lines = vc->vc_rows / 2;
1101         scrolldelta(-lines);
1102 }
1103
1104 void scrollfront(struct vc_data *vc, int lines)
1105 {
1106         if (!lines)
1107                 lines = vc->vc_rows / 2;
1108         scrolldelta(lines);
1109 }
1110
1111 static void lf(struct vc_data *vc)
1112 {
1113         /* don't scroll if above bottom of scrolling region, or
1114          * if below scrolling region
1115          */
1116         if (vc->vc_y + 1 == vc->vc_bottom)
1117                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1118         else if (vc->vc_y < vc->vc_rows - 1) {
1119                 vc->vc_y++;
1120                 vc->vc_pos += vc->vc_size_row;
1121         }
1122         vc->vc_need_wrap = 0;
1123         notify_write(vc, '\n');
1124 }
1125
1126 static void ri(struct vc_data *vc)
1127 {
1128         /* don't scroll if below top of scrolling region, or
1129          * if above scrolling region
1130          */
1131         if (vc->vc_y == vc->vc_top)
1132                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1133         else if (vc->vc_y > 0) {
1134                 vc->vc_y--;
1135                 vc->vc_pos -= vc->vc_size_row;
1136         }
1137         vc->vc_need_wrap = 0;
1138 }
1139
1140 static inline void cr(struct vc_data *vc)
1141 {
1142         vc->vc_pos -= vc->vc_x << 1;
1143         vc->vc_need_wrap = vc->vc_x = 0;
1144         notify_write(vc, '\r');
1145 }
1146
1147 static inline void bs(struct vc_data *vc)
1148 {
1149         if (vc->vc_x) {
1150                 vc->vc_pos -= 2;
1151                 vc->vc_x--;
1152                 vc->vc_need_wrap = 0;
1153                 notify_write(vc, '\b');
1154         }
1155 }
1156
1157 static inline void del(struct vc_data *vc)
1158 {
1159         /* ignored */
1160 }
1161
1162 static void csi_J(struct vc_data *vc, int vpar)
1163 {
1164         unsigned int count;
1165         unsigned short * start;
1166
1167         switch (vpar) {
1168                 case 0: /* erase from cursor to end of display */
1169                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1170                         start = (unsigned short *)vc->vc_pos;
1171                         if (DO_UPDATE(vc)) {
1172                                 /* do in two stages */
1173                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1174                                               vc->vc_cols - vc->vc_x);
1175                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1176                                               vc->vc_rows - vc->vc_y - 1,
1177                                               vc->vc_cols);
1178                         }
1179                         break;
1180                 case 1: /* erase from start to cursor */
1181                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1182                         start = (unsigned short *)vc->vc_origin;
1183                         if (DO_UPDATE(vc)) {
1184                                 /* do in two stages */
1185                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1186                                               vc->vc_cols);
1187                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1188                                               vc->vc_x + 1);
1189                         }
1190                         break;
1191                 case 2: /* erase whole display */
1192                         count = vc->vc_cols * vc->vc_rows;
1193                         start = (unsigned short *)vc->vc_origin;
1194                         if (DO_UPDATE(vc))
1195                                 vc->vc_sw->con_clear(vc, 0, 0,
1196                                               vc->vc_rows,
1197                                               vc->vc_cols);
1198                         break;
1199                 default:
1200                         return;
1201         }
1202         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1203         vc->vc_need_wrap = 0;
1204 }
1205
1206 static void csi_K(struct vc_data *vc, int vpar)
1207 {
1208         unsigned int count;
1209         unsigned short * start;
1210
1211         switch (vpar) {
1212                 case 0: /* erase from cursor to end of line */
1213                         count = vc->vc_cols - vc->vc_x;
1214                         start = (unsigned short *)vc->vc_pos;
1215                         if (DO_UPDATE(vc))
1216                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1217                                                      vc->vc_cols - vc->vc_x);
1218                         break;
1219                 case 1: /* erase from start of line to cursor */
1220                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1221                         count = vc->vc_x + 1;
1222                         if (DO_UPDATE(vc))
1223                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1224                                                      vc->vc_x + 1);
1225                         break;
1226                 case 2: /* erase whole line */
1227                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1228                         count = vc->vc_cols;
1229                         if (DO_UPDATE(vc))
1230                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1231                                               vc->vc_cols);
1232                         break;
1233                 default:
1234                         return;
1235         }
1236         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1237         vc->vc_need_wrap = 0;
1238 }
1239
1240 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1241 {                                         /* not vt100? */
1242         int count;
1243
1244         if (!vpar)
1245                 vpar++;
1246         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1247
1248         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1249         if (DO_UPDATE(vc))
1250                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1251         vc->vc_need_wrap = 0;
1252 }
1253
1254 static void default_attr(struct vc_data *vc)
1255 {
1256         vc->vc_intensity = 1;
1257         vc->vc_italic = 0;
1258         vc->vc_underline = 0;
1259         vc->vc_reverse = 0;
1260         vc->vc_blink = 0;
1261         vc->vc_color = vc->vc_def_color;
1262 }
1263
1264 /* console_sem is held */
1265 static void csi_m(struct vc_data *vc)
1266 {
1267         int i;
1268
1269         for (i = 0; i <= vc->vc_npar; i++)
1270                 switch (vc->vc_par[i]) {
1271                         case 0: /* all attributes off */
1272                                 default_attr(vc);
1273                                 break;
1274                         case 1:
1275                                 vc->vc_intensity = 2;
1276                                 break;
1277                         case 2:
1278                                 vc->vc_intensity = 0;
1279                                 break;
1280                         case 3:
1281                                 vc->vc_italic = 1;
1282                                 break;
1283                         case 4:
1284                                 vc->vc_underline = 1;
1285                                 break;
1286                         case 5:
1287                                 vc->vc_blink = 1;
1288                                 break;
1289                         case 7:
1290                                 vc->vc_reverse = 1;
1291                                 break;
1292                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1293                                   * Select primary font, don't display
1294                                   * control chars if defined, don't set
1295                                   * bit 8 on output.
1296                                   */
1297                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1298                                                 ? vc->vc_G0_charset
1299                                                 : vc->vc_G1_charset, vc);
1300                                 vc->vc_disp_ctrl = 0;
1301                                 vc->vc_toggle_meta = 0;
1302                                 break;
1303                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1304                                   * Select first alternate font, lets
1305                                   * chars < 32 be displayed as ROM chars.
1306                                   */
1307                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1308                                 vc->vc_disp_ctrl = 1;
1309                                 vc->vc_toggle_meta = 0;
1310                                 break;
1311                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1312                                   * Select second alternate font, toggle
1313                                   * high bit before displaying as ROM char.
1314                                   */
1315                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1316                                 vc->vc_disp_ctrl = 1;
1317                                 vc->vc_toggle_meta = 1;
1318                                 break;
1319                         case 21:
1320                         case 22:
1321                                 vc->vc_intensity = 1;
1322                                 break;
1323                         case 23:
1324                                 vc->vc_italic = 0;
1325                                 break;
1326                         case 24:
1327                                 vc->vc_underline = 0;
1328                                 break;
1329                         case 25:
1330                                 vc->vc_blink = 0;
1331                                 break;
1332                         case 27:
1333                                 vc->vc_reverse = 0;
1334                                 break;
1335                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1336                                   * Enables underscore, white foreground
1337                                   * with white underscore (Linux - use
1338                                   * default foreground).
1339                                   */
1340                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1341                                 vc->vc_underline = 1;
1342                                 break;
1343                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1344                                   * Disable underline option.
1345                                   * Reset colour to default? It did this
1346                                   * before...
1347                                   */
1348                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1349                                 vc->vc_underline = 0;
1350                                 break;
1351                         case 49:
1352                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1353                                 break;
1354                         default:
1355                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1356                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1357                                                 | (vc->vc_color & 0xf0);
1358                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1359                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1360                                                 | (vc->vc_color & 0x0f);
1361                                 break;
1362                 }
1363         update_attr(vc);
1364 }
1365
1366 static void respond_string(const char *p, struct tty_struct *tty)
1367 {
1368         while (*p) {
1369                 tty_insert_flip_char(tty, *p, 0);
1370                 p++;
1371         }
1372         con_schedule_flip(tty);
1373 }
1374
1375 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1376 {
1377         char buf[40];
1378
1379         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1380         respond_string(buf, tty);
1381 }
1382
1383 static inline void status_report(struct tty_struct *tty)
1384 {
1385         respond_string("\033[0n", tty); /* Terminal ok */
1386 }
1387
1388 static inline void respond_ID(struct tty_struct * tty)
1389 {
1390         respond_string(VT102ID, tty);
1391 }
1392
1393 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1394 {
1395         char buf[8];
1396
1397         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1398                 (char)('!' + mry));
1399         respond_string(buf, tty);
1400 }
1401
1402 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1403 int mouse_reporting(void)
1404 {
1405         return vc_cons[fg_console].d->vc_report_mouse;
1406 }
1407
1408 /* console_sem is held */
1409 static void set_mode(struct vc_data *vc, int on_off)
1410 {
1411         int i;
1412
1413         for (i = 0; i <= vc->vc_npar; i++)
1414                 if (vc->vc_ques) {
1415                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1416                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1417                                 if (on_off)
1418                                         set_kbd(vc, decckm);
1419                                 else
1420                                         clr_kbd(vc, decckm);
1421                                 break;
1422                         case 3: /* 80/132 mode switch unimplemented */
1423                                 vc->vc_deccolm = on_off;
1424 #if 0
1425                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1426                                 /* this alone does not suffice; some user mode
1427                                    utility has to change the hardware regs */
1428 #endif
1429                                 break;
1430                         case 5:                 /* Inverted screen on/off */
1431                                 if (vc->vc_decscnm != on_off) {
1432                                         vc->vc_decscnm = on_off;
1433                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1434                                         update_attr(vc);
1435                                 }
1436                                 break;
1437                         case 6:                 /* Origin relative/absolute */
1438                                 vc->vc_decom = on_off;
1439                                 gotoxay(vc, 0, 0);
1440                                 break;
1441                         case 7:                 /* Autowrap on/off */
1442                                 vc->vc_decawm = on_off;
1443                                 break;
1444                         case 8:                 /* Autorepeat on/off */
1445                                 if (on_off)
1446                                         set_kbd(vc, decarm);
1447                                 else
1448                                         clr_kbd(vc, decarm);
1449                                 break;
1450                         case 9:
1451                                 vc->vc_report_mouse = on_off ? 1 : 0;
1452                                 break;
1453                         case 25:                /* Cursor on/off */
1454                                 vc->vc_deccm = on_off;
1455                                 break;
1456                         case 1000:
1457                                 vc->vc_report_mouse = on_off ? 2 : 0;
1458                                 break;
1459                         }
1460                 } else {
1461                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1462                         case 3:                 /* Monitor (display ctrls) */
1463                                 vc->vc_disp_ctrl = on_off;
1464                                 break;
1465                         case 4:                 /* Insert Mode on/off */
1466                                 vc->vc_decim = on_off;
1467                                 break;
1468                         case 20:                /* Lf, Enter == CrLf/Lf */
1469                                 if (on_off)
1470                                         set_kbd(vc, lnm);
1471                                 else
1472                                         clr_kbd(vc, lnm);
1473                                 break;
1474                         }
1475                 }
1476 }
1477
1478 /* console_sem is held */
1479 static void setterm_command(struct vc_data *vc)
1480 {
1481         switch(vc->vc_par[0]) {
1482                 case 1: /* set color for underline mode */
1483                         if (vc->vc_can_do_color &&
1484                                         vc->vc_par[1] < 16) {
1485                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1486                                 if (vc->vc_underline)
1487                                         update_attr(vc);
1488                         }
1489                         break;
1490                 case 2: /* set color for half intensity mode */
1491                         if (vc->vc_can_do_color &&
1492                                         vc->vc_par[1] < 16) {
1493                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1494                                 if (vc->vc_intensity == 0)
1495                                         update_attr(vc);
1496                         }
1497                         break;
1498                 case 8: /* store colors as defaults */
1499                         vc->vc_def_color = vc->vc_attr;
1500                         if (vc->vc_hi_font_mask == 0x100)
1501                                 vc->vc_def_color >>= 1;
1502                         default_attr(vc);
1503                         update_attr(vc);
1504                         break;
1505                 case 9: /* set blanking interval */
1506                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1507                         poke_blanked_console();
1508                         break;
1509                 case 10: /* set bell frequency in Hz */
1510                         if (vc->vc_npar >= 1)
1511                                 vc->vc_bell_pitch = vc->vc_par[1];
1512                         else
1513                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1514                         break;
1515                 case 11: /* set bell duration in msec */
1516                         if (vc->vc_npar >= 1)
1517                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1518                                         vc->vc_par[1] * HZ / 1000 : 0;
1519                         else
1520                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1521                         break;
1522                 case 12: /* bring specified console to the front */
1523                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1524                                 set_console(vc->vc_par[1] - 1);
1525                         break;
1526                 case 13: /* unblank the screen */
1527                         poke_blanked_console();
1528                         break;
1529                 case 14: /* set vesa powerdown interval */
1530                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1531                         break;
1532                 case 15: /* activate the previous console */
1533                         set_console(last_console);
1534                         break;
1535         }
1536 }
1537
1538 /* console_sem is held */
1539 static void csi_at(struct vc_data *vc, unsigned int nr)
1540 {
1541         if (nr > vc->vc_cols - vc->vc_x)
1542                 nr = vc->vc_cols - vc->vc_x;
1543         else if (!nr)
1544                 nr = 1;
1545         insert_char(vc, nr);
1546 }
1547
1548 /* console_sem is held */
1549 static void csi_L(struct vc_data *vc, unsigned int nr)
1550 {
1551         if (nr > vc->vc_rows - vc->vc_y)
1552                 nr = vc->vc_rows - vc->vc_y;
1553         else if (!nr)
1554                 nr = 1;
1555         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1556         vc->vc_need_wrap = 0;
1557 }
1558
1559 /* console_sem is held */
1560 static void csi_P(struct vc_data *vc, unsigned int nr)
1561 {
1562         if (nr > vc->vc_cols - vc->vc_x)
1563                 nr = vc->vc_cols - vc->vc_x;
1564         else if (!nr)
1565                 nr = 1;
1566         delete_char(vc, nr);
1567 }
1568
1569 /* console_sem is held */
1570 static void csi_M(struct vc_data *vc, unsigned int nr)
1571 {
1572         if (nr > vc->vc_rows - vc->vc_y)
1573                 nr = vc->vc_rows - vc->vc_y;
1574         else if (!nr)
1575                 nr=1;
1576         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1577         vc->vc_need_wrap = 0;
1578 }
1579
1580 /* console_sem is held (except via vc_init->reset_terminal */
1581 static void save_cur(struct vc_data *vc)
1582 {
1583         vc->vc_saved_x          = vc->vc_x;
1584         vc->vc_saved_y          = vc->vc_y;
1585         vc->vc_s_intensity      = vc->vc_intensity;
1586         vc->vc_s_italic         = vc->vc_italic;
1587         vc->vc_s_underline      = vc->vc_underline;
1588         vc->vc_s_blink          = vc->vc_blink;
1589         vc->vc_s_reverse        = vc->vc_reverse;
1590         vc->vc_s_charset        = vc->vc_charset;
1591         vc->vc_s_color          = vc->vc_color;
1592         vc->vc_saved_G0         = vc->vc_G0_charset;
1593         vc->vc_saved_G1         = vc->vc_G1_charset;
1594 }
1595
1596 /* console_sem is held */
1597 static void restore_cur(struct vc_data *vc)
1598 {
1599         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1600         vc->vc_intensity        = vc->vc_s_intensity;
1601         vc->vc_italic           = vc->vc_s_italic;
1602         vc->vc_underline        = vc->vc_s_underline;
1603         vc->vc_blink            = vc->vc_s_blink;
1604         vc->vc_reverse          = vc->vc_s_reverse;
1605         vc->vc_charset          = vc->vc_s_charset;
1606         vc->vc_color            = vc->vc_s_color;
1607         vc->vc_G0_charset       = vc->vc_saved_G0;
1608         vc->vc_G1_charset       = vc->vc_saved_G1;
1609         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1610         update_attr(vc);
1611         vc->vc_need_wrap = 0;
1612 }
1613
1614 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1615         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1616         ESpalette };
1617
1618 /* console_sem is held (except via vc_init()) */
1619 static void reset_terminal(struct vc_data *vc, int do_clear)
1620 {
1621         vc->vc_top              = 0;
1622         vc->vc_bottom           = vc->vc_rows;
1623         vc->vc_state            = ESnormal;
1624         vc->vc_ques             = 0;
1625         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1626         vc->vc_G0_charset       = LAT1_MAP;
1627         vc->vc_G1_charset       = GRAF_MAP;
1628         vc->vc_charset          = 0;
1629         vc->vc_need_wrap        = 0;
1630         vc->vc_report_mouse     = 0;
1631         vc->vc_utf              = default_utf8;
1632         vc->vc_utf_count        = 0;
1633
1634         vc->vc_disp_ctrl        = 0;
1635         vc->vc_toggle_meta      = 0;
1636
1637         vc->vc_decscnm          = 0;
1638         vc->vc_decom            = 0;
1639         vc->vc_decawm           = 1;
1640         vc->vc_deccm            = global_cursor_default;
1641         vc->vc_decim            = 0;
1642
1643         set_kbd(vc, decarm);
1644         clr_kbd(vc, decckm);
1645         clr_kbd(vc, kbdapplic);
1646         clr_kbd(vc, lnm);
1647         kbd_table[vc->vc_num].lockstate = 0;
1648         kbd_table[vc->vc_num].slockstate = 0;
1649         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1650         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1651         /* do not do set_leds here because this causes an endless tasklet loop
1652            when the keyboard hasn't been initialized yet */
1653
1654         vc->vc_cursor_type = cur_default;
1655         vc->vc_complement_mask = vc->vc_s_complement_mask;
1656
1657         default_attr(vc);
1658         update_attr(vc);
1659
1660         vc->vc_tab_stop[0]      = 0x01010100;
1661         vc->vc_tab_stop[1]      =
1662         vc->vc_tab_stop[2]      =
1663         vc->vc_tab_stop[3]      =
1664         vc->vc_tab_stop[4]      =
1665         vc->vc_tab_stop[5]      =
1666         vc->vc_tab_stop[6]      =
1667         vc->vc_tab_stop[7]      = 0x01010101;
1668
1669         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1670         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1671
1672         gotoxy(vc, 0, 0);
1673         save_cur(vc);
1674         if (do_clear)
1675             csi_J(vc, 2);
1676 }
1677
1678 /* console_sem is held */
1679 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1680 {
1681         /*
1682          *  Control characters can be used in the _middle_
1683          *  of an escape sequence.
1684          */
1685         switch (c) {
1686         case 0:
1687                 return;
1688         case 7:
1689                 if (vc->vc_bell_duration)
1690                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1691                 return;
1692         case 8:
1693                 bs(vc);
1694                 return;
1695         case 9:
1696                 vc->vc_pos -= (vc->vc_x << 1);
1697                 while (vc->vc_x < vc->vc_cols - 1) {
1698                         vc->vc_x++;
1699                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1700                                 break;
1701                 }
1702                 vc->vc_pos += (vc->vc_x << 1);
1703                 notify_write(vc, '\t');
1704                 return;
1705         case 10: case 11: case 12:
1706                 lf(vc);
1707                 if (!is_kbd(vc, lnm))
1708                         return;
1709         case 13:
1710                 cr(vc);
1711                 return;
1712         case 14:
1713                 vc->vc_charset = 1;
1714                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1715                 vc->vc_disp_ctrl = 1;
1716                 return;
1717         case 15:
1718                 vc->vc_charset = 0;
1719                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1720                 vc->vc_disp_ctrl = 0;
1721                 return;
1722         case 24: case 26:
1723                 vc->vc_state = ESnormal;
1724                 return;
1725         case 27:
1726                 vc->vc_state = ESesc;
1727                 return;
1728         case 127:
1729                 del(vc);
1730                 return;
1731         case 128+27:
1732                 vc->vc_state = ESsquare;
1733                 return;
1734         }
1735         switch(vc->vc_state) {
1736         case ESesc:
1737                 vc->vc_state = ESnormal;
1738                 switch (c) {
1739                 case '[':
1740                         vc->vc_state = ESsquare;
1741                         return;
1742                 case ']':
1743                         vc->vc_state = ESnonstd;
1744                         return;
1745                 case '%':
1746                         vc->vc_state = ESpercent;
1747                         return;
1748                 case 'E':
1749                         cr(vc);
1750                         lf(vc);
1751                         return;
1752                 case 'M':
1753                         ri(vc);
1754                         return;
1755                 case 'D':
1756                         lf(vc);
1757                         return;
1758                 case 'H':
1759                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1760                         return;
1761                 case 'Z':
1762                         respond_ID(tty);
1763                         return;
1764                 case '7':
1765                         save_cur(vc);
1766                         return;
1767                 case '8':
1768                         restore_cur(vc);
1769                         return;
1770                 case '(':
1771                         vc->vc_state = ESsetG0;
1772                         return;
1773                 case ')':
1774                         vc->vc_state = ESsetG1;
1775                         return;
1776                 case '#':
1777                         vc->vc_state = EShash;
1778                         return;
1779                 case 'c':
1780                         reset_terminal(vc, 1);
1781                         return;
1782                 case '>':  /* Numeric keypad */
1783                         clr_kbd(vc, kbdapplic);
1784                         return;
1785                 case '=':  /* Appl. keypad */
1786                         set_kbd(vc, kbdapplic);
1787                         return;
1788                 }
1789                 return;
1790         case ESnonstd:
1791                 if (c=='P') {   /* palette escape sequence */
1792                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1793                                 vc->vc_par[vc->vc_npar] = 0;
1794                         vc->vc_npar = 0;
1795                         vc->vc_state = ESpalette;
1796                         return;
1797                 } else if (c=='R') {   /* reset palette */
1798                         reset_palette(vc);
1799                         vc->vc_state = ESnormal;
1800                 } else
1801                         vc->vc_state = ESnormal;
1802                 return;
1803         case ESpalette:
1804                 if (isxdigit(c)) {
1805                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1806                         if (vc->vc_npar == 7) {
1807                                 int i = vc->vc_par[0] * 3, j = 1;
1808                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1809                                 vc->vc_palette[i++] += vc->vc_par[j++];
1810                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1811                                 vc->vc_palette[i++] += vc->vc_par[j++];
1812                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1813                                 vc->vc_palette[i] += vc->vc_par[j];
1814                                 set_palette(vc);
1815                                 vc->vc_state = ESnormal;
1816                         }
1817                 } else
1818                         vc->vc_state = ESnormal;
1819                 return;
1820         case ESsquare:
1821                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1822                         vc->vc_par[vc->vc_npar] = 0;
1823                 vc->vc_npar = 0;
1824                 vc->vc_state = ESgetpars;
1825                 if (c == '[') { /* Function key */
1826                         vc->vc_state=ESfunckey;
1827                         return;
1828                 }
1829                 vc->vc_ques = (c == '?');
1830                 if (vc->vc_ques)
1831                         return;
1832         case ESgetpars:
1833                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1834                         vc->vc_npar++;
1835                         return;
1836                 } else if (c>='0' && c<='9') {
1837                         vc->vc_par[vc->vc_npar] *= 10;
1838                         vc->vc_par[vc->vc_npar] += c - '0';
1839                         return;
1840                 } else
1841                         vc->vc_state = ESgotpars;
1842         case ESgotpars:
1843                 vc->vc_state = ESnormal;
1844                 switch(c) {
1845                 case 'h':
1846                         set_mode(vc, 1);
1847                         return;
1848                 case 'l':
1849                         set_mode(vc, 0);
1850                         return;
1851                 case 'c':
1852                         if (vc->vc_ques) {
1853                                 if (vc->vc_par[0])
1854                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1855                                 else
1856                                         vc->vc_cursor_type = cur_default;
1857                                 return;
1858                         }
1859                         break;
1860                 case 'm':
1861                         if (vc->vc_ques) {
1862                                 clear_selection();
1863                                 if (vc->vc_par[0])
1864                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1865                                 else
1866                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1867                                 return;
1868                         }
1869                         break;
1870                 case 'n':
1871                         if (!vc->vc_ques) {
1872                                 if (vc->vc_par[0] == 5)
1873                                         status_report(tty);
1874                                 else if (vc->vc_par[0] == 6)
1875                                         cursor_report(vc, tty);
1876                         }
1877                         return;
1878                 }
1879                 if (vc->vc_ques) {
1880                         vc->vc_ques = 0;
1881                         return;
1882                 }
1883                 switch(c) {
1884                 case 'G': case '`':
1885                         if (vc->vc_par[0])
1886                                 vc->vc_par[0]--;
1887                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1888                         return;
1889                 case 'A':
1890                         if (!vc->vc_par[0])
1891                                 vc->vc_par[0]++;
1892                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1893                         return;
1894                 case 'B': case 'e':
1895                         if (!vc->vc_par[0])
1896                                 vc->vc_par[0]++;
1897                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1898                         return;
1899                 case 'C': case 'a':
1900                         if (!vc->vc_par[0])
1901                                 vc->vc_par[0]++;
1902                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1903                         return;
1904                 case 'D':
1905                         if (!vc->vc_par[0])
1906                                 vc->vc_par[0]++;
1907                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1908                         return;
1909                 case 'E':
1910                         if (!vc->vc_par[0])
1911                                 vc->vc_par[0]++;
1912                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1913                         return;
1914                 case 'F':
1915                         if (!vc->vc_par[0])
1916                                 vc->vc_par[0]++;
1917                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1918                         return;
1919                 case 'd':
1920                         if (vc->vc_par[0])
1921                                 vc->vc_par[0]--;
1922                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1923                         return;
1924                 case 'H': case 'f':
1925                         if (vc->vc_par[0])
1926                                 vc->vc_par[0]--;
1927                         if (vc->vc_par[1])
1928                                 vc->vc_par[1]--;
1929                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1930                         return;
1931                 case 'J':
1932                         csi_J(vc, vc->vc_par[0]);
1933                         return;
1934                 case 'K':
1935                         csi_K(vc, vc->vc_par[0]);
1936                         return;
1937                 case 'L':
1938                         csi_L(vc, vc->vc_par[0]);
1939                         return;
1940                 case 'M':
1941                         csi_M(vc, vc->vc_par[0]);
1942                         return;
1943                 case 'P':
1944                         csi_P(vc, vc->vc_par[0]);
1945                         return;
1946                 case 'c':
1947                         if (!vc->vc_par[0])
1948                                 respond_ID(tty);
1949                         return;
1950                 case 'g':
1951                         if (!vc->vc_par[0])
1952                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1953                         else if (vc->vc_par[0] == 3) {
1954                                 vc->vc_tab_stop[0] =
1955                                         vc->vc_tab_stop[1] =
1956                                         vc->vc_tab_stop[2] =
1957                                         vc->vc_tab_stop[3] =
1958                                         vc->vc_tab_stop[4] =
1959                                         vc->vc_tab_stop[5] =
1960                                         vc->vc_tab_stop[6] =
1961                                         vc->vc_tab_stop[7] = 0;
1962                         }
1963                         return;
1964                 case 'm':
1965                         csi_m(vc);
1966                         return;
1967                 case 'q': /* DECLL - but only 3 leds */
1968                         /* map 0,1,2,3 to 0,1,2,4 */
1969                         if (vc->vc_par[0] < 4)
1970                                 setledstate(kbd_table + vc->vc_num,
1971                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1972                         return;
1973                 case 'r':
1974                         if (!vc->vc_par[0])
1975                                 vc->vc_par[0]++;
1976                         if (!vc->vc_par[1])
1977                                 vc->vc_par[1] = vc->vc_rows;
1978                         /* Minimum allowed region is 2 lines */
1979                         if (vc->vc_par[0] < vc->vc_par[1] &&
1980                             vc->vc_par[1] <= vc->vc_rows) {
1981                                 vc->vc_top = vc->vc_par[0] - 1;
1982                                 vc->vc_bottom = vc->vc_par[1];
1983                                 gotoxay(vc, 0, 0);
1984                         }
1985                         return;
1986                 case 's':
1987                         save_cur(vc);
1988                         return;
1989                 case 'u':
1990                         restore_cur(vc);
1991                         return;
1992                 case 'X':
1993                         csi_X(vc, vc->vc_par[0]);
1994                         return;
1995                 case '@':
1996                         csi_at(vc, vc->vc_par[0]);
1997                         return;
1998                 case ']': /* setterm functions */
1999                         setterm_command(vc);
2000                         return;
2001                 }
2002                 return;
2003         case ESpercent:
2004                 vc->vc_state = ESnormal;
2005                 switch (c) {
2006                 case '@':  /* defined in ISO 2022 */
2007                         vc->vc_utf = 0;
2008                         return;
2009                 case 'G':  /* prelim official escape code */
2010                 case '8':  /* retained for compatibility */
2011                         vc->vc_utf = 1;
2012                         return;
2013                 }
2014                 return;
2015         case ESfunckey:
2016                 vc->vc_state = ESnormal;
2017                 return;
2018         case EShash:
2019                 vc->vc_state = ESnormal;
2020                 if (c == '8') {
2021                         /* DEC screen alignment test. kludge :-) */
2022                         vc->vc_video_erase_char =
2023                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2024                         csi_J(vc, 2);
2025                         vc->vc_video_erase_char =
2026                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2027                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2028                 }
2029                 return;
2030         case ESsetG0:
2031                 if (c == '0')
2032                         vc->vc_G0_charset = GRAF_MAP;
2033                 else if (c == 'B')
2034                         vc->vc_G0_charset = LAT1_MAP;
2035                 else if (c == 'U')
2036                         vc->vc_G0_charset = IBMPC_MAP;
2037                 else if (c == 'K')
2038                         vc->vc_G0_charset = USER_MAP;
2039                 if (vc->vc_charset == 0)
2040                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2041                 vc->vc_state = ESnormal;
2042                 return;
2043         case ESsetG1:
2044                 if (c == '0')
2045                         vc->vc_G1_charset = GRAF_MAP;
2046                 else if (c == 'B')
2047                         vc->vc_G1_charset = LAT1_MAP;
2048                 else if (c == 'U')
2049                         vc->vc_G1_charset = IBMPC_MAP;
2050                 else if (c == 'K')
2051                         vc->vc_G1_charset = USER_MAP;
2052                 if (vc->vc_charset == 1)
2053                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2054                 vc->vc_state = ESnormal;
2055                 return;
2056         default:
2057                 vc->vc_state = ESnormal;
2058         }
2059 }
2060
2061 /* This is a temporary buffer used to prepare a tty console write
2062  * so that we can easily avoid touching user space while holding the
2063  * console spinlock.  It is allocated in con_init and is shared by
2064  * this code and the vc_screen read/write tty calls.
2065  *
2066  * We have to allocate this statically in the kernel data section
2067  * since console_init (and thus con_init) are called before any
2068  * kernel memory allocation is available.
2069  */
2070 char con_buf[CON_BUF_SIZE];
2071 DEFINE_MUTEX(con_buf_mtx);
2072
2073 /* is_double_width() is based on the wcwidth() implementation by
2074  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2075  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2076  */
2077 struct interval {
2078         uint32_t first;
2079         uint32_t last;
2080 };
2081
2082 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2083 {
2084         int min = 0;
2085         int mid;
2086
2087         if (ucs < table[0].first || ucs > table[max].last)
2088                 return 0;
2089         while (max >= min) {
2090                 mid = (min + max) / 2;
2091                 if (ucs > table[mid].last)
2092                         min = mid + 1;
2093                 else if (ucs < table[mid].first)
2094                         max = mid - 1;
2095                 else
2096                         return 1;
2097         }
2098         return 0;
2099 }
2100
2101 static int is_double_width(uint32_t ucs)
2102 {
2103         static const struct interval double_width[] = {
2104                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2105                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2106                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2107                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2108         };
2109         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2110 }
2111
2112 /* acquires console_sem */
2113 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2114 {
2115 #ifdef VT_BUF_VRAM_ONLY
2116 #define FLUSH do { } while(0);
2117 #else
2118 #define FLUSH if (draw_x >= 0) { \
2119         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2120         draw_x = -1; \
2121         }
2122 #endif
2123
2124         int c, tc, ok, n = 0, draw_x = -1;
2125         unsigned int currcons;
2126         unsigned long draw_from = 0, draw_to = 0;
2127         struct vc_data *vc;
2128         unsigned char vc_attr;
2129         struct vt_notifier_param param;
2130         uint8_t rescan;
2131         uint8_t inverse;
2132         uint8_t width;
2133         u16 himask, charmask;
2134
2135         if (in_interrupt())
2136                 return count;
2137
2138         might_sleep();
2139
2140         acquire_console_sem();
2141         vc = tty->driver_data;
2142         if (vc == NULL) {
2143                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2144                 release_console_sem();
2145                 return 0;
2146         }
2147
2148         currcons = vc->vc_num;
2149         if (!vc_cons_allocated(currcons)) {
2150             /* could this happen? */
2151                 printk_once("con_write: tty %d not allocated\n", currcons+1);
2152             release_console_sem();
2153             return 0;
2154         }
2155
2156         himask = vc->vc_hi_font_mask;
2157         charmask = himask ? 0x1ff : 0xff;
2158
2159         /* undraw cursor first */
2160         if (IS_FG(vc))
2161                 hide_cursor(vc);
2162
2163         param.vc = vc;
2164
2165         while (!tty->stopped && count) {
2166                 int orig = *buf;
2167                 c = orig;
2168                 buf++;
2169                 n++;
2170                 count--;
2171                 rescan = 0;
2172                 inverse = 0;
2173                 width = 1;
2174
2175                 /* Do no translation at all in control states */
2176                 if (vc->vc_state != ESnormal) {
2177                         tc = c;
2178                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2179                     /* Combine UTF-8 into Unicode in vc_utf_char.
2180                      * vc_utf_count is the number of continuation bytes still
2181                      * expected to arrive.
2182                      * vc_npar is the number of continuation bytes arrived so
2183                      * far
2184                      */
2185 rescan_last_byte:
2186                     if ((c & 0xc0) == 0x80) {
2187                         /* Continuation byte received */
2188                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2189                         if (vc->vc_utf_count) {
2190                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2191                             vc->vc_npar++;
2192                             if (--vc->vc_utf_count) {
2193                                 /* Still need some bytes */
2194                                 continue;
2195                             }
2196                             /* Got a whole character */
2197                             c = vc->vc_utf_char;
2198                             /* Reject overlong sequences */
2199                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2200                                         c > utf8_length_changes[vc->vc_npar])
2201                                 c = 0xfffd;
2202                         } else {
2203                             /* Unexpected continuation byte */
2204                             vc->vc_utf_count = 0;
2205                             c = 0xfffd;
2206                         }
2207                     } else {
2208                         /* Single ASCII byte or first byte of a sequence received */
2209                         if (vc->vc_utf_count) {
2210                             /* Continuation byte expected */
2211                             rescan = 1;
2212                             vc->vc_utf_count = 0;
2213                             c = 0xfffd;
2214                         } else if (c > 0x7f) {
2215                             /* First byte of a multibyte sequence received */
2216                             vc->vc_npar = 0;
2217                             if ((c & 0xe0) == 0xc0) {
2218                                 vc->vc_utf_count = 1;
2219                                 vc->vc_utf_char = (c & 0x1f);
2220                             } else if ((c & 0xf0) == 0xe0) {
2221                                 vc->vc_utf_count = 2;
2222                                 vc->vc_utf_char = (c & 0x0f);
2223                             } else if ((c & 0xf8) == 0xf0) {
2224                                 vc->vc_utf_count = 3;
2225                                 vc->vc_utf_char = (c & 0x07);
2226                             } else if ((c & 0xfc) == 0xf8) {
2227                                 vc->vc_utf_count = 4;
2228                                 vc->vc_utf_char = (c & 0x03);
2229                             } else if ((c & 0xfe) == 0xfc) {
2230                                 vc->vc_utf_count = 5;
2231                                 vc->vc_utf_char = (c & 0x01);
2232                             } else {
2233                                 /* 254 and 255 are invalid */
2234                                 c = 0xfffd;
2235                             }
2236                             if (vc->vc_utf_count) {
2237                                 /* Still need some bytes */
2238                                 continue;
2239                             }
2240                         }
2241                         /* Nothing to do if an ASCII byte was received */
2242                     }
2243                     /* End of UTF-8 decoding. */
2244                     /* c is the received character, or U+FFFD for invalid sequences. */
2245                     /* Replace invalid Unicode code points with U+FFFD too */
2246                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2247                         c = 0xfffd;
2248                     tc = c;
2249                 } else {        /* no utf or alternate charset mode */
2250                     tc = vc_translate(vc, c);
2251                 }
2252
2253                 param.c = tc;
2254                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2255                                         &param) == NOTIFY_STOP)
2256                         continue;
2257
2258                 /* If the original code was a control character we
2259                  * only allow a glyph to be displayed if the code is
2260                  * not normally used (such as for cursor movement) or
2261                  * if the disp_ctrl mode has been explicitly enabled.
2262                  * Certain characters (as given by the CTRL_ALWAYS
2263                  * bitmap) are always displayed as control characters,
2264                  * as the console would be pretty useless without
2265                  * them; to display an arbitrary font position use the
2266                  * direct-to-font zone in UTF-8 mode.
2267                  */
2268                 ok = tc && (c >= 32 ||
2269                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2270                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2271                         && (c != 127 || vc->vc_disp_ctrl)
2272                         && (c != 128+27);
2273
2274                 if (vc->vc_state == ESnormal && ok) {
2275                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2276                                 if (is_double_width(c))
2277                                         width = 2;
2278                         }
2279                         /* Now try to find out how to display it */
2280                         tc = conv_uni_to_pc(vc, tc);
2281                         if (tc & ~charmask) {
2282                                 if (tc == -1 || tc == -2) {
2283                                     continue; /* nothing to display */
2284                                 }
2285                                 /* Glyph not found */
2286                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2287                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2288                                        This would make absolutely no sense with Unicode in mind,
2289                                        but do this for ASCII characters since a font may lack
2290                                        Unicode mapping info and we don't want to end up with
2291                                        having question marks only. */
2292                                     tc = c;
2293                                 } else {
2294                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2295                                     tc = conv_uni_to_pc(vc, 0xfffd);
2296                                     if (tc < 0) {
2297                                         inverse = 1;
2298                                         tc = conv_uni_to_pc(vc, '?');
2299                                         if (tc < 0) tc = '?';
2300                                     }
2301                                 }
2302                         }
2303
2304                         if (!inverse) {
2305                                 vc_attr = vc->vc_attr;
2306                         } else {
2307                                 /* invert vc_attr */
2308                                 if (!vc->vc_can_do_color) {
2309                                         vc_attr = (vc->vc_attr) ^ 0x08;
2310                                 } else if (vc->vc_hi_font_mask == 0x100) {
2311                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2312                                 } else {
2313                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2314                                 }
2315                                 FLUSH
2316                         }
2317
2318                         while (1) {
2319                                 if (vc->vc_need_wrap || vc->vc_decim)
2320                                         FLUSH
2321                                 if (vc->vc_need_wrap) {
2322                                         cr(vc);
2323                                         lf(vc);
2324                                 }
2325                                 if (vc->vc_decim)
2326                                         insert_char(vc, 1);
2327                                 scr_writew(himask ?
2328                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2329                                              (vc_attr << 8) + tc,
2330                                            (u16 *) vc->vc_pos);
2331                                 if (DO_UPDATE(vc) && draw_x < 0) {
2332                                         draw_x = vc->vc_x;
2333                                         draw_from = vc->vc_pos;
2334                                 }
2335                                 if (vc->vc_x == vc->vc_cols - 1) {
2336                                         vc->vc_need_wrap = vc->vc_decawm;
2337                                         draw_to = vc->vc_pos + 2;
2338                                 } else {
2339                                         vc->vc_x++;
2340                                         draw_to = (vc->vc_pos += 2);
2341                                 }
2342
2343                                 if (!--width) break;
2344
2345                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2346                                 if (tc < 0) tc = ' ';
2347                         }
2348                         notify_write(vc, c);
2349
2350                         if (inverse) {
2351                                 FLUSH
2352                         }
2353
2354                         if (rescan) {
2355                                 rescan = 0;
2356                                 inverse = 0;
2357                                 width = 1;
2358                                 c = orig;
2359                                 goto rescan_last_byte;
2360                         }
2361                         continue;
2362                 }
2363                 FLUSH
2364                 do_con_trol(tty, vc, orig);
2365         }
2366         FLUSH
2367         console_conditional_schedule();
2368         release_console_sem();
2369         notify_update(vc);
2370         return n;
2371 #undef FLUSH
2372 }
2373
2374 /*
2375  * This is the console switching callback.
2376  *
2377  * Doing console switching in a process context allows
2378  * us to do the switches asynchronously (needed when we want
2379  * to switch due to a keyboard interrupt).  Synchronization
2380  * with other console code and prevention of re-entrancy is
2381  * ensured with console_sem.
2382  */
2383 static void console_callback(struct work_struct *ignored)
2384 {
2385         acquire_console_sem();
2386
2387         if (want_console >= 0) {
2388                 if (want_console != fg_console &&
2389                     vc_cons_allocated(want_console)) {
2390                         hide_cursor(vc_cons[fg_console].d);
2391                         change_console(vc_cons[want_console].d);
2392                         /* we only changed when the console had already
2393                            been allocated - a new console is not created
2394                            in an interrupt routine */
2395                 }
2396                 want_console = -1;
2397         }
2398         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2399                 do_poke_blanked_console = 0;
2400                 poke_blanked_console();
2401         }
2402         if (scrollback_delta) {
2403                 struct vc_data *vc = vc_cons[fg_console].d;
2404                 clear_selection();
2405                 if (vc->vc_mode == KD_TEXT)
2406                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2407                 scrollback_delta = 0;
2408         }
2409         if (blank_timer_expired) {
2410                 do_blank_screen(0);
2411                 blank_timer_expired = 0;
2412         }
2413         notify_update(vc_cons[fg_console].d);
2414
2415         release_console_sem();
2416 }
2417
2418 int set_console(int nr)
2419 {
2420         struct vc_data *vc = vc_cons[fg_console].d;
2421
2422         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2423                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2424
2425                 /*
2426                  * Console switch will fail in console_callback() or
2427                  * change_console() so there is no point scheduling
2428                  * the callback
2429                  *
2430                  * Existing set_console() users don't check the return
2431                  * value so this shouldn't break anything
2432                  */
2433                 return -EINVAL;
2434         }
2435
2436         want_console = nr;
2437         schedule_console_callback();
2438
2439         return 0;
2440 }
2441
2442 struct tty_driver *console_driver;
2443
2444 #ifdef CONFIG_VT_CONSOLE
2445
2446 /**
2447  * vt_kmsg_redirect() - Sets/gets the kernel message console
2448  * @new:        The new virtual terminal number or -1 if the console should stay
2449  *              unchanged
2450  *
2451  * By default, the kernel messages are always printed on the current virtual
2452  * console. However, the user may modify that default with the
2453  * TIOCL_SETKMSGREDIRECT ioctl call.
2454  *
2455  * This function sets the kernel message console to be @new. It returns the old
2456  * virtual console number. The virtual terminal number 0 (both as parameter and
2457  * return value) means no redirection (i.e. always printed on the currently
2458  * active console).
2459  *
2460  * The parameter -1 means that only the current console is returned, but the
2461  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2462  * case to make the code more understandable.
2463  *
2464  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2465  * the parameter and always returns 0.
2466  */
2467 int vt_kmsg_redirect(int new)
2468 {
2469         static int kmsg_con;
2470
2471         if (new != -1)
2472                 return xchg(&kmsg_con, new);
2473         else
2474                 return kmsg_con;
2475 }
2476
2477 /*
2478  *      Console on virtual terminal
2479  *
2480  * The console must be locked when we get here.
2481  */
2482
2483 static void vt_console_print(struct console *co, const char *b, unsigned count)
2484 {
2485         struct vc_data *vc = vc_cons[fg_console].d;
2486         unsigned char c;
2487         static DEFINE_SPINLOCK(printing_lock);
2488         const ushort *start;
2489         ushort cnt = 0;
2490         ushort myx;
2491         int kmsg_console;
2492
2493         /* console busy or not yet initialized */
2494         if (!printable)
2495                 return;
2496         if (!spin_trylock(&printing_lock))
2497                 return;
2498
2499         kmsg_console = vt_get_kmsg_redirect();
2500         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2501                 vc = vc_cons[kmsg_console - 1].d;
2502
2503         /* read `x' only after setting currcons properly (otherwise
2504            the `x' macro will read the x of the foreground console). */
2505         myx = vc->vc_x;
2506
2507         if (!vc_cons_allocated(fg_console)) {
2508                 /* impossible */
2509                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2510                 goto quit;
2511         }
2512
2513         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2514                 goto quit;
2515
2516         /* undraw cursor first */
2517         if (IS_FG(vc))
2518                 hide_cursor(vc);
2519
2520         start = (ushort *)vc->vc_pos;
2521
2522         /* Contrived structure to try to emulate original need_wrap behaviour
2523          * Problems caused when we have need_wrap set on '\n' character */
2524         while (count--) {
2525                 c = *b++;
2526                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2527                         if (cnt > 0) {
2528                                 if (CON_IS_VISIBLE(vc))
2529                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2530                                 vc->vc_x += cnt;
2531                                 if (vc->vc_need_wrap)
2532                                         vc->vc_x--;
2533                                 cnt = 0;
2534                         }
2535                         if (c == 8) {           /* backspace */
2536                                 bs(vc);
2537                                 start = (ushort *)vc->vc_pos;
2538                                 myx = vc->vc_x;
2539                                 continue;
2540                         }
2541                         if (c != 13)
2542                                 lf(vc);
2543                         cr(vc);
2544                         start = (ushort *)vc->vc_pos;
2545                         myx = vc->vc_x;
2546                         if (c == 10 || c == 13)
2547                                 continue;
2548                 }
2549                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2550                 notify_write(vc, c);
2551                 cnt++;
2552                 if (myx == vc->vc_cols - 1) {
2553                         vc->vc_need_wrap = 1;
2554                         continue;
2555                 }
2556                 vc->vc_pos += 2;
2557                 myx++;
2558         }
2559         if (cnt > 0) {
2560                 if (CON_IS_VISIBLE(vc))
2561                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2562                 vc->vc_x += cnt;
2563                 if (vc->vc_x == vc->vc_cols) {
2564                         vc->vc_x--;
2565                         vc->vc_need_wrap = 1;
2566                 }
2567         }
2568         set_cursor(vc);
2569         notify_update(vc);
2570
2571 quit:
2572         spin_unlock(&printing_lock);
2573 }
2574
2575 static struct tty_driver *vt_console_device(struct console *c, int *index)
2576 {
2577         *index = c->index ? c->index-1 : fg_console;
2578         return console_driver;
2579 }
2580
2581 static struct console vt_console_driver = {
2582         .name           = "tty",
2583         .write          = vt_console_print,
2584         .device         = vt_console_device,
2585         .unblank        = unblank_screen,
2586         .flags          = CON_PRINTBUFFER,
2587         .index          = -1,
2588 };
2589 #endif
2590
2591 /*
2592  *      Handling of Linux-specific VC ioctls
2593  */
2594
2595 /*
2596  * Generally a bit racy with respect to console_sem().
2597  *
2598  * There are some functions which don't need it.
2599  *
2600  * There are some functions which can sleep for arbitrary periods
2601  * (paste_selection) but we don't need the lock there anyway.
2602  *
2603  * set_selection has locking, and definitely needs it
2604  */
2605
2606 int tioclinux(struct tty_struct *tty, unsigned long arg)
2607 {
2608         char type, data;
2609         char __user *p = (char __user *)arg;
2610         int lines;
2611         int ret;
2612
2613         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2614                 return -EPERM;
2615         if (get_user(type, p))
2616                 return -EFAULT;
2617         ret = 0;
2618
2619         switch (type)
2620         {
2621                 case TIOCL_SETSEL:
2622                         acquire_console_sem();
2623                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2624                         release_console_sem();
2625                         break;
2626                 case TIOCL_PASTESEL:
2627                         ret = paste_selection(tty);
2628                         break;
2629                 case TIOCL_UNBLANKSCREEN:
2630                         acquire_console_sem();
2631                         unblank_screen();
2632                         release_console_sem();
2633                         break;
2634                 case TIOCL_SELLOADLUT:
2635                         ret = sel_loadlut(p);
2636                         break;
2637                 case TIOCL_GETSHIFTSTATE:
2638
2639         /*
2640          * Make it possible to react to Shift+Mousebutton.
2641          * Note that 'shift_state' is an undocumented
2642          * kernel-internal variable; programs not closely
2643          * related to the kernel should not use this.
2644          */
2645                         data = shift_state;
2646                         ret = __put_user(data, p);
2647                         break;
2648                 case TIOCL_GETMOUSEREPORTING:
2649                         data = mouse_reporting();
2650                         ret = __put_user(data, p);
2651                         break;
2652                 case TIOCL_SETVESABLANK:
2653                         ret = set_vesa_blanking(p);
2654                         break;
2655                 case TIOCL_GETKMSGREDIRECT:
2656                         data = vt_get_kmsg_redirect();
2657                         ret = __put_user(data, p);
2658                         break;
2659                 case TIOCL_SETKMSGREDIRECT:
2660                         if (!capable(CAP_SYS_ADMIN)) {
2661                                 ret = -EPERM;
2662                         } else {
2663                                 if (get_user(data, p+1))
2664                                         ret = -EFAULT;
2665                                 else
2666                                         vt_kmsg_redirect(data);
2667                         }
2668                         break;
2669                 case TIOCL_GETFGCONSOLE:
2670                         ret = fg_console;
2671                         break;
2672                 case TIOCL_SCROLLCONSOLE:
2673                         if (get_user(lines, (s32 __user *)(p+4))) {
2674                                 ret = -EFAULT;
2675                         } else {
2676                                 scrollfront(vc_cons[fg_console].d, lines);
2677                                 ret = 0;
2678                         }
2679                         break;
2680                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2681                         acquire_console_sem();
2682                         ignore_poke = 1;
2683                         do_blank_screen(0);
2684                         release_console_sem();
2685                         break;
2686                 case TIOCL_BLANKEDSCREEN:
2687                         ret = console_blanked;
2688                         break;
2689                 default:
2690                         ret = -EINVAL;
2691                         break;
2692         }
2693         return ret;
2694 }
2695
2696 /*
2697  * /dev/ttyN handling
2698  */
2699
2700 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2701 {
2702         int     retval;
2703
2704         retval = do_con_write(tty, buf, count);
2705         con_flush_chars(tty);
2706
2707         return retval;
2708 }
2709
2710 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2711 {
2712         if (in_interrupt())
2713                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2714         return do_con_write(tty, &ch, 1);
2715 }
2716
2717 static int con_write_room(struct tty_struct *tty)
2718 {
2719         if (tty->stopped)
2720                 return 0;
2721         return 32768;           /* No limit, really; we're not buffering */
2722 }
2723
2724 static int con_chars_in_buffer(struct tty_struct *tty)
2725 {
2726         return 0;               /* we're not buffering */
2727 }
2728
2729 /*
2730  * con_throttle and con_unthrottle are only used for
2731  * paste_selection(), which has to stuff in a large number of
2732  * characters...
2733  */
2734 static void con_throttle(struct tty_struct *tty)
2735 {
2736 }
2737
2738 static void con_unthrottle(struct tty_struct *tty)
2739 {
2740         struct vc_data *vc = tty->driver_data;
2741
2742         wake_up_interruptible(&vc->paste_wait);
2743 }
2744
2745 /*
2746  * Turn the Scroll-Lock LED on when the tty is stopped
2747  */
2748 static void con_stop(struct tty_struct *tty)
2749 {
2750         int console_num;
2751         if (!tty)
2752                 return;
2753         console_num = tty->index;
2754         if (!vc_cons_allocated(console_num))
2755                 return;
2756         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2757         set_leds();
2758 }
2759
2760 /*
2761  * Turn the Scroll-Lock LED off when the console is started
2762  */
2763 static void con_start(struct tty_struct *tty)
2764 {
2765         int console_num;
2766         if (!tty)
2767                 return;
2768         console_num = tty->index;
2769         if (!vc_cons_allocated(console_num))
2770                 return;
2771         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2772         set_leds();
2773 }
2774
2775 static void con_flush_chars(struct tty_struct *tty)
2776 {
2777         struct vc_data *vc;
2778
2779         if (in_interrupt())     /* from flush_to_ldisc */
2780                 return;
2781
2782         /* if we race with con_close(), vt may be null */
2783         acquire_console_sem();
2784         vc = tty->driver_data;
2785         if (vc)
2786                 set_cursor(vc);
2787         release_console_sem();
2788 }
2789
2790 /*
2791  * Allocate the console screen memory.
2792  */
2793 static int con_open(struct tty_struct *tty, struct file *filp)
2794 {
2795         unsigned int currcons = tty->index;
2796         int ret = 0;
2797
2798         acquire_console_sem();
2799         if (tty->driver_data == NULL) {
2800                 ret = vc_allocate(currcons);
2801                 if (ret == 0) {
2802                         struct vc_data *vc = vc_cons[currcons].d;
2803
2804                         /* Still being freed */
2805                         if (vc->port.tty) {
2806                                 release_console_sem();
2807                                 return -ERESTARTSYS;
2808                         }
2809                         tty->driver_data = vc;
2810                         vc->port.tty = tty;
2811
2812                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2813                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2814                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2815                         }
2816                         if (vc->vc_utf)
2817                                 tty->termios->c_iflag |= IUTF8;
2818                         else
2819                                 tty->termios->c_iflag &= ~IUTF8;
2820                         release_console_sem();
2821                         return ret;
2822                 }
2823         }
2824         release_console_sem();
2825         return ret;
2826 }
2827
2828 static void con_close(struct tty_struct *tty, struct file *filp)
2829 {
2830         /* Nothing to do - we defer to shutdown */
2831 }
2832
2833 static void con_shutdown(struct tty_struct *tty)
2834 {
2835         struct vc_data *vc = tty->driver_data;
2836         BUG_ON(vc == NULL);
2837         acquire_console_sem();
2838         vc->port.tty = NULL;
2839         release_console_sem();
2840         tty_shutdown(tty);
2841 }
2842
2843 static int default_italic_color    = 2; // green (ASCII)
2844 static int default_underline_color = 3; // cyan (ASCII)
2845 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2846 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2847
2848 static void vc_init(struct vc_data *vc, unsigned int rows,
2849                     unsigned int cols, int do_clear)
2850 {
2851         int j, k ;
2852
2853         vc->vc_cols = cols;
2854         vc->vc_rows = rows;
2855         vc->vc_size_row = cols << 1;
2856         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2857
2858         set_origin(vc);
2859         vc->vc_pos = vc->vc_origin;
2860         reset_vc(vc);
2861         for (j=k=0; j<16; j++) {
2862                 vc->vc_palette[k++] = default_red[j] ;
2863                 vc->vc_palette[k++] = default_grn[j] ;
2864                 vc->vc_palette[k++] = default_blu[j] ;
2865         }
2866         vc->vc_def_color       = 0x07;   /* white */
2867         vc->vc_ulcolor         = default_underline_color;
2868         vc->vc_itcolor         = default_italic_color;
2869         vc->vc_halfcolor       = 0x08;   /* grey */
2870         init_waitqueue_head(&vc->paste_wait);
2871         reset_terminal(vc, do_clear);
2872 }
2873
2874 /*
2875  * This routine initializes console interrupts, and does nothing
2876  * else. If you want the screen to clear, call tty_write with
2877  * the appropriate escape-sequence.
2878  */
2879
2880 static int __init con_init(void)
2881 {
2882         const char *display_desc = NULL;
2883         struct vc_data *vc;
2884         unsigned int currcons = 0, i;
2885
2886         acquire_console_sem();
2887
2888         if (conswitchp)
2889                 display_desc = conswitchp->con_startup();
2890         if (!display_desc) {
2891                 fg_console = 0;
2892                 release_console_sem();
2893                 return 0;
2894         }
2895
2896         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2897                 struct con_driver *con_driver = &registered_con_driver[i];
2898
2899                 if (con_driver->con == NULL) {
2900                         con_driver->con = conswitchp;
2901                         con_driver->desc = display_desc;
2902                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2903                         con_driver->first = 0;
2904                         con_driver->last = MAX_NR_CONSOLES - 1;
2905                         break;
2906                 }
2907         }
2908
2909         for (i = 0; i < MAX_NR_CONSOLES; i++)
2910                 con_driver_map[i] = conswitchp;
2911
2912         if (blankinterval) {
2913                 blank_state = blank_normal_wait;
2914                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2915         }
2916
2917         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2918                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2919                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2920                 tty_port_init(&vc->port);
2921                 visual_init(vc, currcons, 1);
2922                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2923                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2924                         currcons || !vc->vc_sw->con_save_screen);
2925         }
2926         currcons = fg_console = 0;
2927         master_display_fg = vc = vc_cons[currcons].d;
2928         set_origin(vc);
2929         save_screen(vc);
2930         gotoxy(vc, vc->vc_x, vc->vc_y);
2931         csi_J(vc, 0);
2932         update_screen(vc);
2933         printk("Console: %s %s %dx%d",
2934                 vc->vc_can_do_color ? "colour" : "mono",
2935                 display_desc, vc->vc_cols, vc->vc_rows);
2936         printable = 1;
2937         printk("\n");
2938
2939         release_console_sem();
2940
2941 #ifdef CONFIG_VT_CONSOLE
2942         register_console(&vt_console_driver);
2943 #endif
2944         return 0;
2945 }
2946 console_initcall(con_init);
2947
2948 static const struct tty_operations con_ops = {
2949         .open = con_open,
2950         .close = con_close,
2951         .write = con_write,
2952         .write_room = con_write_room,
2953         .put_char = con_put_char,
2954         .flush_chars = con_flush_chars,
2955         .chars_in_buffer = con_chars_in_buffer,
2956         .ioctl = vt_ioctl,
2957 #ifdef CONFIG_COMPAT
2958         .compat_ioctl = vt_compat_ioctl,
2959 #endif
2960         .stop = con_stop,
2961         .start = con_start,
2962         .throttle = con_throttle,
2963         .unthrottle = con_unthrottle,
2964         .resize = vt_resize,
2965         .shutdown = con_shutdown
2966 };
2967
2968 static struct cdev vc0_cdev;
2969
2970 int __init vty_init(const struct file_operations *console_fops)
2971 {
2972         cdev_init(&vc0_cdev, console_fops);
2973         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2974             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2975                 panic("Couldn't register /dev/tty0 driver\n");
2976         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2977
2978         vcs_init();
2979
2980         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2981         if (!console_driver)
2982                 panic("Couldn't allocate console driver\n");
2983         console_driver->owner = THIS_MODULE;
2984         console_driver->name = "tty";
2985         console_driver->name_base = 1;
2986         console_driver->major = TTY_MAJOR;
2987         console_driver->minor_start = 1;
2988         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2989         console_driver->init_termios = tty_std_termios;
2990         if (default_utf8)
2991                 console_driver->init_termios.c_iflag |= IUTF8;
2992         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2993         tty_set_operations(console_driver, &con_ops);
2994         if (tty_register_driver(console_driver))
2995                 panic("Couldn't register console driver\n");
2996         kbd_init();
2997         console_map_init();
2998 #ifdef CONFIG_MDA_CONSOLE
2999         mda_console_init();
3000 #endif
3001         return 0;
3002 }
3003
3004 #ifndef VT_SINGLE_DRIVER
3005
3006 static struct class *vtconsole_class;
3007
3008 static int bind_con_driver(const struct consw *csw, int first, int last,
3009                            int deflt)
3010 {
3011         struct module *owner = csw->owner;
3012         const char *desc = NULL;
3013         struct con_driver *con_driver;
3014         int i, j = -1, k = -1, retval = -ENODEV;
3015
3016         if (!try_module_get(owner))
3017                 return -ENODEV;
3018
3019         acquire_console_sem();
3020
3021         /* check if driver is registered */
3022         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3023                 con_driver = &registered_con_driver[i];
3024
3025                 if (con_driver->con == csw) {
3026                         desc = con_driver->desc;
3027                         retval = 0;
3028                         break;
3029                 }
3030         }
3031
3032         if (retval)
3033                 goto err;
3034
3035         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3036                 csw->con_startup();
3037                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3038         }
3039
3040         if (deflt) {
3041                 if (conswitchp)
3042                         module_put(conswitchp->owner);
3043
3044                 __module_get(owner);
3045                 conswitchp = csw;
3046         }
3047
3048         first = max(first, con_driver->first);
3049         last = min(last, con_driver->last);
3050
3051         for (i = first; i <= last; i++) {
3052                 int old_was_color;
3053                 struct vc_data *vc = vc_cons[i].d;
3054
3055                 if (con_driver_map[i])
3056                         module_put(con_driver_map[i]->owner);
3057                 __module_get(owner);
3058                 con_driver_map[i] = csw;
3059
3060                 if (!vc || !vc->vc_sw)
3061                         continue;
3062
3063                 j = i;
3064
3065                 if (CON_IS_VISIBLE(vc)) {
3066                         k = i;
3067                         save_screen(vc);
3068                 }
3069
3070                 old_was_color = vc->vc_can_do_color;
3071                 vc->vc_sw->con_deinit(vc);
3072                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3073                 visual_init(vc, i, 0);
3074                 set_origin(vc);
3075                 update_attr(vc);
3076
3077                 /* If the console changed between mono <-> color, then
3078                  * the attributes in the screenbuf will be wrong.  The
3079                  * following resets all attributes to something sane.
3080                  */
3081                 if (old_was_color != vc->vc_can_do_color)
3082                         clear_buffer_attributes(vc);
3083         }
3084
3085         printk("Console: switching ");
3086         if (!deflt)
3087                 printk("consoles %d-%d ", first+1, last+1);
3088         if (j >= 0) {
3089                 struct vc_data *vc = vc_cons[j].d;
3090
3091                 printk("to %s %s %dx%d\n",
3092                        vc->vc_can_do_color ? "colour" : "mono",
3093                        desc, vc->vc_cols, vc->vc_rows);
3094
3095                 if (k >= 0) {
3096                         vc = vc_cons[k].d;
3097                         update_screen(vc);
3098                 }
3099         } else
3100                 printk("to %s\n", desc);
3101
3102         retval = 0;
3103 err:
3104         release_console_sem();
3105         module_put(owner);
3106         return retval;
3107 };
3108
3109 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3110 static int con_is_graphics(const struct consw *csw, int first, int last)
3111 {
3112         int i, retval = 0;
3113
3114         for (i = first; i <= last; i++) {
3115                 struct vc_data *vc = vc_cons[i].d;
3116
3117                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3118                         retval = 1;
3119                         break;
3120                 }
3121         }
3122
3123         return retval;
3124 }
3125
3126 /**
3127  * unbind_con_driver - unbind a console driver
3128  * @csw: pointer to console driver to unregister
3129  * @first: first in range of consoles that @csw should be unbound from
3130  * @last: last in range of consoles that @csw should be unbound from
3131  * @deflt: should next bound console driver be default after @csw is unbound?
3132  *
3133  * To unbind a driver from all possible consoles, pass 0 as @first and
3134  * %MAX_NR_CONSOLES as @last.
3135  *
3136  * @deflt controls whether the console that ends up replacing @csw should be
3137  * the default console.
3138  *
3139  * RETURNS:
3140  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3141  * or 0 on success.
3142  */
3143 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3144 {
3145         struct module *owner = csw->owner;
3146         const struct consw *defcsw = NULL;
3147         struct con_driver *con_driver = NULL, *con_back = NULL;
3148         int i, retval = -ENODEV;
3149
3150         if (!try_module_get(owner))
3151                 return -ENODEV;
3152
3153         acquire_console_sem();
3154
3155         /* check if driver is registered and if it is unbindable */
3156         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3157                 con_driver = &registered_con_driver[i];
3158
3159                 if (con_driver->con == csw &&
3160                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3161                         retval = 0;
3162                         break;
3163                 }
3164         }
3165
3166         if (retval) {
3167                 release_console_sem();
3168                 goto err;
3169         }
3170
3171         retval = -ENODEV;
3172
3173         /* check if backup driver exists */
3174         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3175                 con_back = &registered_con_driver[i];
3176
3177                 if (con_back->con &&
3178                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3179                         defcsw = con_back->con;
3180                         retval = 0;
3181                         break;
3182                 }
3183         }
3184
3185         if (retval) {
3186                 release_console_sem();
3187                 goto err;
3188         }
3189
3190         if (!con_is_bound(csw)) {
3191                 release_console_sem();
3192                 goto err;
3193         }
3194
3195         first = max(first, con_driver->first);
3196         last = min(last, con_driver->last);
3197
3198         for (i = first; i <= last; i++) {
3199                 if (con_driver_map[i] == csw) {
3200                         module_put(csw->owner);
3201                         con_driver_map[i] = NULL;
3202                 }
3203         }
3204
3205         if (!con_is_bound(defcsw)) {
3206                 const struct consw *defconsw = conswitchp;
3207
3208                 defcsw->con_startup();
3209                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3210                 /*
3211                  * vgacon may change the default driver to point
3212                  * to dummycon, we restore it here...
3213                  */
3214                 conswitchp = defconsw;
3215         }
3216
3217         if (!con_is_bound(csw))
3218                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3219
3220         release_console_sem();
3221         /* ignore return value, binding should not fail */
3222         bind_con_driver(defcsw, first, last, deflt);
3223 err:
3224         module_put(owner);
3225         return retval;
3226
3227 }
3228 EXPORT_SYMBOL(unbind_con_driver);
3229
3230 static int vt_bind(struct con_driver *con)
3231 {
3232         const struct consw *defcsw = NULL, *csw = NULL;
3233         int i, more = 1, first = -1, last = -1, deflt = 0;
3234
3235         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3236             con_is_graphics(con->con, con->first, con->last))
3237                 goto err;
3238
3239         csw = con->con;
3240
3241         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3242                 struct con_driver *con = &registered_con_driver[i];
3243
3244                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3245                         defcsw = con->con;
3246                         break;
3247                 }
3248         }
3249
3250         if (!defcsw)
3251                 goto err;
3252
3253         while (more) {
3254                 more = 0;
3255
3256                 for (i = con->first; i <= con->last; i++) {
3257                         if (con_driver_map[i] == defcsw) {
3258                                 if (first == -1)
3259                                         first = i;
3260                                 last = i;
3261                                 more = 1;
3262                         } else if (first != -1)
3263                                 break;
3264                 }
3265
3266                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3267                         deflt = 1;
3268
3269                 if (first != -1)
3270                         bind_con_driver(csw, first, last, deflt);
3271
3272                 first = -1;
3273                 last = -1;
3274                 deflt = 0;
3275         }
3276
3277 err:
3278         return 0;
3279 }
3280
3281 static int vt_unbind(struct con_driver *con)
3282 {
3283         const struct consw *csw = NULL;
3284         int i, more = 1, first = -1, last = -1, deflt = 0;
3285
3286         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3287             con_is_graphics(con->con, con->first, con->last))
3288                 goto err;
3289
3290         csw = con->con;
3291
3292         while (more) {
3293                 more = 0;
3294
3295                 for (i = con->first; i <= con->last; i++) {
3296                         if (con_driver_map[i] == csw) {
3297                                 if (first == -1)
3298                                         first = i;
3299                                 last = i;
3300                                 more = 1;
3301                         } else if (first != -1)
3302                                 break;
3303                 }
3304
3305                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3306                         deflt = 1;
3307
3308                 if (first != -1)
3309                         unbind_con_driver(csw, first, last, deflt);
3310
3311                 first = -1;
3312                 last = -1;
3313                 deflt = 0;
3314         }
3315
3316 err:
3317         return 0;
3318 }
3319 #else
3320 static inline int vt_bind(struct con_driver *con)
3321 {
3322         return 0;
3323 }
3324 static inline int vt_unbind(struct con_driver *con)
3325 {
3326         return 0;
3327 }
3328 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3329
3330 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3331                           const char *buf, size_t count)
3332 {
3333         struct con_driver *con = dev_get_drvdata(dev);
3334         int bind = simple_strtoul(buf, NULL, 0);
3335
3336         if (bind)
3337                 vt_bind(con);
3338         else
3339                 vt_unbind(con);
3340
3341         return count;
3342 }
3343
3344 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3345                          char *buf)
3346 {
3347         struct con_driver *con = dev_get_drvdata(dev);
3348         int bind = con_is_bound(con->con);
3349
3350         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3351 }
3352
3353 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3354                          char *buf)
3355 {
3356         struct con_driver *con = dev_get_drvdata(dev);
3357
3358         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3359                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3360                          con->desc);
3361
3362 }
3363
3364 static struct device_attribute device_attrs[] = {
3365         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3366         __ATTR(name, S_IRUGO, show_name, NULL),
3367 };
3368
3369 static int vtconsole_init_device(struct con_driver *con)
3370 {
3371         int i;
3372         int error = 0;
3373
3374         con->flag |= CON_DRIVER_FLAG_ATTR;
3375         dev_set_drvdata(con->dev, con);
3376         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3377                 error = device_create_file(con->dev, &device_attrs[i]);
3378                 if (error)
3379                         break;
3380         }
3381
3382         if (error) {
3383                 while (--i >= 0)
3384                         device_remove_file(con->dev, &device_attrs[i]);
3385                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3386         }
3387
3388         return error;
3389 }
3390
3391 static void vtconsole_deinit_device(struct con_driver *con)
3392 {
3393         int i;
3394
3395         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3396                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3397                         device_remove_file(con->dev, &device_attrs[i]);
3398                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3399         }
3400 }
3401
3402 /**
3403  * con_is_bound - checks if driver is bound to the console
3404  * @csw: console driver
3405  *
3406  * RETURNS: zero if unbound, nonzero if bound
3407  *
3408  * Drivers can call this and if zero, they should release
3409  * all resources allocated on con_startup()
3410  */
3411 int con_is_bound(const struct consw *csw)
3412 {
3413         int i, bound = 0;
3414
3415         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3416                 if (con_driver_map[i] == csw) {
3417                         bound = 1;
3418                         break;
3419                 }
3420         }
3421
3422         return bound;
3423 }
3424 EXPORT_SYMBOL(con_is_bound);
3425
3426 /**
3427  * con_debug_enter - prepare the console for the kernel debugger
3428  * @sw: console driver
3429  *
3430  * Called when the console is taken over by the kernel debugger, this
3431  * function needs to save the current console state, then put the console
3432  * into a state suitable for the kernel debugger.
3433  *
3434  * RETURNS:
3435  * Zero on success, nonzero if a failure occurred when trying to prepare
3436  * the console for the debugger.
3437  */
3438 int con_debug_enter(struct vc_data *vc)
3439 {
3440         int ret = 0;
3441
3442         saved_fg_console = fg_console;
3443         saved_last_console = last_console;
3444         saved_want_console = want_console;
3445         saved_vc_mode = vc->vc_mode;
3446         saved_console_blanked = console_blanked;
3447         vc->vc_mode = KD_TEXT;
3448         console_blanked = 0;
3449         if (vc->vc_sw->con_debug_enter)
3450                 ret = vc->vc_sw->con_debug_enter(vc);
3451 #ifdef CONFIG_KGDB_KDB
3452         /* Set the initial LINES variable if it is not already set */
3453         if (vc->vc_rows < 999) {
3454                 int linecount;
3455                 char lns[4];
3456                 const char *setargs[3] = {
3457                         "set",
3458                         "LINES",
3459                         lns,
3460                 };
3461                 if (kdbgetintenv(setargs[0], &linecount)) {
3462                         snprintf(lns, 4, "%i", vc->vc_rows);
3463                         kdb_set(2, setargs);
3464                 }
3465         }
3466 #endif /* CONFIG_KGDB_KDB */
3467         return ret;
3468 }
3469 EXPORT_SYMBOL_GPL(con_debug_enter);
3470
3471 /**
3472  * con_debug_leave - restore console state
3473  * @sw: console driver
3474  *
3475  * Restore the console state to what it was before the kernel debugger
3476  * was invoked.
3477  *
3478  * RETURNS:
3479  * Zero on success, nonzero if a failure occurred when trying to restore
3480  * the console.
3481  */
3482 int con_debug_leave(void)
3483 {
3484         struct vc_data *vc;
3485         int ret = 0;
3486
3487         fg_console = saved_fg_console;
3488         last_console = saved_last_console;
3489         want_console = saved_want_console;
3490         console_blanked = saved_console_blanked;
3491         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3492
3493         vc = vc_cons[fg_console].d;
3494         if (vc->vc_sw->con_debug_leave)
3495                 ret = vc->vc_sw->con_debug_leave(vc);
3496         return ret;
3497 }
3498 EXPORT_SYMBOL_GPL(con_debug_leave);
3499
3500 /**
3501  * register_con_driver - register console driver to console layer
3502  * @csw: console driver
3503  * @first: the first console to take over, minimum value is 0
3504  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3505  *
3506  * DESCRIPTION: This function registers a console driver which can later
3507  * bind to a range of consoles specified by @first and @last. It will
3508  * also initialize the console driver by calling con_startup().
3509  */
3510 int register_con_driver(const struct consw *csw, int first, int last)
3511 {
3512         struct module *owner = csw->owner;
3513         struct con_driver *con_driver;
3514         const char *desc;
3515         int i, retval = 0;
3516
3517         if (!try_module_get(owner))
3518                 return -ENODEV;
3519
3520         acquire_console_sem();
3521
3522         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3523                 con_driver = &registered_con_driver[i];
3524
3525                 /* already registered */
3526                 if (con_driver->con == csw)
3527                         retval = -EINVAL;
3528         }
3529
3530         if (retval)
3531                 goto err;
3532
3533         desc = csw->con_startup();
3534
3535         if (!desc)
3536                 goto err;
3537
3538         retval = -EINVAL;
3539
3540         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3541                 con_driver = &registered_con_driver[i];
3542
3543                 if (con_driver->con == NULL) {
3544                         con_driver->con = csw;
3545                         con_driver->desc = desc;
3546                         con_driver->node = i;
3547                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3548                                            CON_DRIVER_FLAG_INIT;
3549                         con_driver->first = first;
3550                         con_driver->last = last;
3551                         retval = 0;
3552                         break;
3553                 }
3554         }
3555
3556         if (retval)
3557                 goto err;
3558
3559         con_driver->dev = device_create(vtconsole_class, NULL,
3560                                                 MKDEV(0, con_driver->node),
3561                                                 NULL, "vtcon%i",
3562                                                 con_driver->node);
3563
3564         if (IS_ERR(con_driver->dev)) {
3565                 printk(KERN_WARNING "Unable to create device for %s; "
3566                        "errno = %ld\n", con_driver->desc,
3567                        PTR_ERR(con_driver->dev));
3568                 con_driver->dev = NULL;
3569         } else {
3570                 vtconsole_init_device(con_driver);
3571         }
3572
3573 err:
3574         release_console_sem();
3575         module_put(owner);
3576         return retval;
3577 }
3578 EXPORT_SYMBOL(register_con_driver);
3579
3580 /**
3581  * unregister_con_driver - unregister console driver from console layer
3582  * @csw: console driver
3583  *
3584  * DESCRIPTION: All drivers that registers to the console layer must
3585  * call this function upon exit, or if the console driver is in a state
3586  * where it won't be able to handle console services, such as the
3587  * framebuffer console without loaded framebuffer drivers.
3588  *
3589  * The driver must unbind first prior to unregistration.
3590  */
3591 int unregister_con_driver(const struct consw *csw)
3592 {
3593         int i, retval = -ENODEV;
3594
3595         acquire_console_sem();
3596
3597         /* cannot unregister a bound driver */
3598         if (con_is_bound(csw))
3599                 goto err;
3600
3601         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3602                 struct con_driver *con_driver = &registered_con_driver[i];
3603
3604                 if (con_driver->con == csw &&
3605                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3606                         vtconsole_deinit_device(con_driver);
3607                         device_destroy(vtconsole_class,
3608                                        MKDEV(0, con_driver->node));
3609                         con_driver->con = NULL;
3610                         con_driver->desc = NULL;
3611                         con_driver->dev = NULL;
3612                         con_driver->node = 0;
3613                         con_driver->flag = 0;
3614                         con_driver->first = 0;
3615                         con_driver->last = 0;
3616                         retval = 0;
3617                         break;
3618                 }
3619         }
3620 err:
3621         release_console_sem();
3622         return retval;
3623 }
3624 EXPORT_SYMBOL(unregister_con_driver);
3625
3626 /*
3627  *      If we support more console drivers, this function is used
3628  *      when a driver wants to take over some existing consoles
3629  *      and become default driver for newly opened ones.
3630  *
3631  *      take_over_console is basically a register followed by unbind
3632  */
3633 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3634 {
3635         int err;
3636
3637         err = register_con_driver(csw, first, last);
3638
3639         if (!err)
3640                 bind_con_driver(csw, first, last, deflt);
3641
3642         return err;
3643 }
3644
3645 /*
3646  * give_up_console is a wrapper to unregister_con_driver. It will only
3647  * work if driver is fully unbound.
3648  */
3649 void give_up_console(const struct consw *csw)
3650 {
3651         unregister_con_driver(csw);
3652 }
3653
3654 static int __init vtconsole_class_init(void)
3655 {
3656         int i;
3657
3658         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3659         if (IS_ERR(vtconsole_class)) {
3660                 printk(KERN_WARNING "Unable to create vt console class; "
3661                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3662                 vtconsole_class = NULL;
3663         }
3664
3665         /* Add system drivers to sysfs */
3666         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3667                 struct con_driver *con = &registered_con_driver[i];
3668
3669                 if (con->con && !con->dev) {
3670                         con->dev = device_create(vtconsole_class, NULL,
3671                                                          MKDEV(0, con->node),
3672                                                          NULL, "vtcon%i",
3673                                                          con->node);
3674
3675                         if (IS_ERR(con->dev)) {
3676                                 printk(KERN_WARNING "Unable to create "
3677                                        "device for %s; errno = %ld\n",
3678                                        con->desc, PTR_ERR(con->dev));
3679                                 con->dev = NULL;
3680                         } else {
3681                                 vtconsole_init_device(con);
3682                         }
3683                 }
3684         }
3685
3686         return 0;
3687 }
3688 postcore_initcall(vtconsole_class_init);
3689
3690 #endif
3691
3692 /*
3693  *      Screen blanking
3694  */
3695
3696 static int set_vesa_blanking(char __user *p)
3697 {
3698         unsigned int mode;
3699
3700         if (get_user(mode, p + 1))
3701                 return -EFAULT;
3702
3703         vesa_blank_mode = (mode < 4) ? mode : 0;
3704         return 0;
3705 }
3706
3707 void do_blank_screen(int entering_gfx)
3708 {
3709         struct vc_data *vc = vc_cons[fg_console].d;
3710         int i;
3711
3712         WARN_CONSOLE_UNLOCKED();
3713
3714         if (console_blanked) {
3715                 if (blank_state == blank_vesa_wait) {
3716                         blank_state = blank_off;
3717                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3718                 }
3719                 return;
3720         }
3721
3722         /* entering graphics mode? */
3723         if (entering_gfx) {
3724                 hide_cursor(vc);
3725                 save_screen(vc);
3726                 vc->vc_sw->con_blank(vc, -1, 1);
3727                 console_blanked = fg_console + 1;
3728                 blank_state = blank_off;
3729                 set_origin(vc);
3730                 return;
3731         }
3732
3733         if (blank_state != blank_normal_wait)
3734                 return;
3735         blank_state = blank_off;
3736
3737         /* don't blank graphics */
3738         if (vc->vc_mode != KD_TEXT) {
3739                 console_blanked = fg_console + 1;
3740                 return;
3741         }
3742
3743         hide_cursor(vc);
3744         del_timer_sync(&console_timer);
3745         blank_timer_expired = 0;
3746
3747         save_screen(vc);
3748         /* In case we need to reset origin, blanking hook returns 1 */
3749         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3750         console_blanked = fg_console + 1;
3751         if (i)
3752                 set_origin(vc);
3753
3754         if (console_blank_hook && console_blank_hook(1))
3755                 return;
3756
3757         if (vesa_off_interval && vesa_blank_mode) {
3758                 blank_state = blank_vesa_wait;
3759                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3760         }
3761         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3762 }
3763 EXPORT_SYMBOL(do_blank_screen);
3764
3765 /*
3766  * Called by timer as well as from vt_console_driver
3767  */
3768 void do_unblank_screen(int leaving_gfx)
3769 {
3770         struct vc_data *vc;
3771
3772         /* This should now always be called from a "sane" (read: can schedule)
3773          * context for the sake of the low level drivers, except in the special
3774          * case of oops_in_progress
3775          */
3776         if (!oops_in_progress)
3777                 might_sleep();
3778
3779         WARN_CONSOLE_UNLOCKED();
3780
3781         ignore_poke = 0;
3782         if (!console_blanked)
3783                 return;
3784         if (!vc_cons_allocated(fg_console)) {
3785                 /* impossible */
3786                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3787                 return;
3788         }
3789         vc = vc_cons[fg_console].d;
3790         /* Try to unblank in oops case too */
3791         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3792                 return; /* but leave console_blanked != 0 */
3793
3794         if (blankinterval) {
3795                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3796                 blank_state = blank_normal_wait;
3797         }
3798
3799         console_blanked = 0;
3800         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3801                 /* Low-level driver cannot restore -> do it ourselves */
3802                 update_screen(vc);
3803         if (console_blank_hook)
3804                 console_blank_hook(0);
3805         set_palette(vc);
3806         set_cursor(vc);
3807         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3808 }
3809 EXPORT_SYMBOL(do_unblank_screen);
3810
3811 /*
3812  * This is called by the outside world to cause a forced unblank, mostly for
3813  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3814  * call it with 1 as an argument and so force a mode restore... that may kill
3815  * X or at least garbage the screen but would also make the Oops visible...
3816  */
3817 void unblank_screen(void)
3818 {
3819         do_unblank_screen(0);
3820 }
3821
3822 /*
3823  * We defer the timer blanking to work queue so it can take the console mutex
3824  * (console operations can still happen at irq time, but only from printk which
3825  * has the console mutex. Not perfect yet, but better than no locking
3826  */
3827 static void blank_screen_t(unsigned long dummy)
3828 {
3829         if (unlikely(!keventd_up())) {
3830                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3831                 return;
3832         }
3833         blank_timer_expired = 1;
3834         schedule_work(&console_work);
3835 }
3836
3837 void poke_blanked_console(void)
3838 {
3839         WARN_CONSOLE_UNLOCKED();
3840
3841         /* Add this so we quickly catch whoever might call us in a non
3842          * safe context. Nowadays, unblank_screen() isn't to be called in
3843          * atomic contexts and is allowed to schedule (with the special case
3844          * of oops_in_progress, but that isn't of any concern for this
3845          * function. --BenH.
3846          */
3847         might_sleep();
3848
3849         /* This isn't perfectly race free, but a race here would be mostly harmless,
3850          * at worse, we'll do a spurrious blank and it's unlikely
3851          */
3852         del_timer(&console_timer);
3853         blank_timer_expired = 0;
3854
3855         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3856                 return;
3857         if (console_blanked)
3858                 unblank_screen();
3859         else if (blankinterval) {
3860                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3861                 blank_state = blank_normal_wait;
3862         }
3863 }
3864
3865 /*
3866  *      Palettes
3867  */
3868
3869 static void set_palette(struct vc_data *vc)
3870 {
3871         WARN_CONSOLE_UNLOCKED();
3872
3873         if (vc->vc_mode != KD_GRAPHICS)
3874                 vc->vc_sw->con_set_palette(vc, color_table);
3875 }
3876
3877 static int set_get_cmap(unsigned char __user *arg, int set)
3878 {
3879     int i, j, k;
3880
3881     WARN_CONSOLE_UNLOCKED();
3882
3883     for (i = 0; i < 16; i++)
3884         if (set) {
3885             get_user(default_red[i], arg++);
3886             get_user(default_grn[i], arg++);
3887             get_user(default_blu[i], arg++);
3888         } else {
3889             put_user(default_red[i], arg++);
3890             put_user(default_grn[i], arg++);
3891             put_user(default_blu[i], arg++);
3892         }
3893     if (set) {
3894         for (i = 0; i < MAX_NR_CONSOLES; i++)
3895             if (vc_cons_allocated(i)) {
3896                 for (j = k = 0; j < 16; j++) {
3897                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3898                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3899                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3900                 }
3901                 set_palette(vc_cons[i].d);
3902             }
3903     }
3904     return 0;
3905 }
3906
3907 /*
3908  * Load palette into the DAC registers. arg points to a colour
3909  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3910  */
3911
3912 int con_set_cmap(unsigned char __user *arg)
3913 {
3914         int rc;
3915
3916         acquire_console_sem();
3917         rc = set_get_cmap (arg,1);
3918         release_console_sem();
3919
3920         return rc;
3921 }
3922
3923 int con_get_cmap(unsigned char __user *arg)
3924 {
3925         int rc;
3926
3927         acquire_console_sem();
3928         rc = set_get_cmap (arg,0);
3929         release_console_sem();
3930
3931         return rc;
3932 }
3933
3934 void reset_palette(struct vc_data *vc)
3935 {
3936         int j, k;
3937         for (j=k=0; j<16; j++) {
3938                 vc->vc_palette[k++] = default_red[j];
3939                 vc->vc_palette[k++] = default_grn[j];
3940                 vc->vc_palette[k++] = default_blu[j];
3941         }
3942         set_palette(vc);
3943 }
3944
3945 /*
3946  *  Font switching
3947  *
3948  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3949  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3950  *  depending on width) reserved for each character which is kinda wasty, but
3951  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3952  *  is upto the actual low-level console-driver convert data into its favorite
3953  *  format (maybe we should add a `fontoffset' field to the `display'
3954  *  structure so we won't have to convert the fontdata all the time.
3955  *  /Jes
3956  */
3957
3958 #define max_font_size 65536
3959
3960 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3961 {
3962         struct console_font font;
3963         int rc = -EINVAL;
3964         int c;
3965
3966         if (vc->vc_mode != KD_TEXT)
3967                 return -EINVAL;
3968
3969         if (op->data) {
3970                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3971                 if (!font.data)
3972                         return -ENOMEM;
3973         } else
3974                 font.data = NULL;
3975
3976         acquire_console_sem();
3977         if (vc->vc_sw->con_font_get)
3978                 rc = vc->vc_sw->con_font_get(vc, &font);
3979         else
3980                 rc = -ENOSYS;
3981         release_console_sem();
3982
3983         if (rc)
3984                 goto out;
3985
3986         c = (font.width+7)/8 * 32 * font.charcount;
3987
3988         if (op->data && font.charcount > op->charcount)
3989                 rc = -ENOSPC;
3990         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3991                 if (font.width > op->width || font.height > op->height)
3992                         rc = -ENOSPC;
3993         } else {
3994                 if (font.width != 8)
3995                         rc = -EIO;
3996                 else if ((op->height && font.height > op->height) ||
3997                          font.height > 32)
3998                         rc = -ENOSPC;
3999         }
4000         if (rc)
4001                 goto out;
4002
4003         op->height = font.height;
4004         op->width = font.width;
4005         op->charcount = font.charcount;
4006
4007         if (op->data && copy_to_user(op->data, font.data, c))
4008                 rc = -EFAULT;
4009
4010 out:
4011         kfree(font.data);
4012         return rc;
4013 }
4014
4015 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4016 {
4017         struct console_font font;
4018         int rc = -EINVAL;
4019         int size;
4020
4021         if (vc->vc_mode != KD_TEXT)
4022                 return -EINVAL;
4023         if (!op->data)
4024                 return -EINVAL;
4025         if (op->charcount > 512)
4026                 return -EINVAL;
4027         if (!op->height) {              /* Need to guess font height [compat] */
4028                 int h, i;
4029                 u8 __user *charmap = op->data;
4030                 u8 tmp;
4031
4032                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4033                    so that we can get rid of this soon */
4034                 if (!(op->flags & KD_FONT_FLAG_OLD))
4035                         return -EINVAL;
4036                 for (h = 32; h > 0; h--)
4037                         for (i = 0; i < op->charcount; i++) {
4038                                 if (get_user(tmp, &charmap[32*i+h-1]))
4039                                         return -EFAULT;
4040                                 if (tmp)
4041                                         goto nonzero;
4042                         }
4043                 return -EINVAL;
4044         nonzero:
4045                 op->height = h;
4046         }
4047         if (op->width <= 0 || op->width > 32 || op->height > 32)
4048                 return -EINVAL;
4049         size = (op->width+7)/8 * 32 * op->charcount;
4050         if (size > max_font_size)
4051                 return -ENOSPC;
4052         font.charcount = op->charcount;
4053         font.height = op->height;
4054         font.width = op->width;
4055         font.data = memdup_user(op->data, size);
4056         if (IS_ERR(font.data))
4057                 return PTR_ERR(font.data);
4058         acquire_console_sem();
4059         if (vc->vc_sw->con_font_set)
4060                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4061         else
4062                 rc = -ENOSYS;
4063         release_console_sem();
4064         kfree(font.data);
4065         return rc;
4066 }
4067
4068 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4069 {
4070         struct console_font font = {.width = op->width, .height = op->height};
4071         char name[MAX_FONT_NAME];
4072         char *s = name;
4073         int rc;
4074
4075         if (vc->vc_mode != KD_TEXT)
4076                 return -EINVAL;
4077
4078         if (!op->data)
4079                 s = NULL;
4080         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4081                 return -EFAULT;
4082         else
4083                 name[MAX_FONT_NAME - 1] = 0;
4084
4085         acquire_console_sem();
4086         if (vc->vc_sw->con_font_default)
4087                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4088         else
4089                 rc = -ENOSYS;
4090         release_console_sem();
4091         if (!rc) {
4092                 op->width = font.width;
4093                 op->height = font.height;
4094         }
4095         return rc;
4096 }
4097
4098 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4099 {
4100         int con = op->height;
4101         int rc;
4102
4103         if (vc->vc_mode != KD_TEXT)
4104                 return -EINVAL;
4105
4106         acquire_console_sem();
4107         if (!vc->vc_sw->con_font_copy)
4108                 rc = -ENOSYS;
4109         else if (con < 0 || !vc_cons_allocated(con))
4110                 rc = -ENOTTY;
4111         else if (con == vc->vc_num)     /* nothing to do */
4112                 rc = 0;
4113         else
4114                 rc = vc->vc_sw->con_font_copy(vc, con);
4115         release_console_sem();
4116         return rc;
4117 }
4118
4119 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4120 {
4121         switch (op->op) {
4122         case KD_FONT_OP_SET:
4123                 return con_font_set(vc, op);
4124         case KD_FONT_OP_GET:
4125                 return con_font_get(vc, op);
4126         case KD_FONT_OP_SET_DEFAULT:
4127                 return con_font_default(vc, op);
4128         case KD_FONT_OP_COPY:
4129                 return con_font_copy(vc, op);
4130         }
4131         return -ENOSYS;
4132 }
4133
4134 /*
4135  *      Interface exported to selection and vcs.
4136  */
4137
4138 /* used by selection */
4139 u16 screen_glyph(struct vc_data *vc, int offset)
4140 {
4141         u16 w = scr_readw(screenpos(vc, offset, 1));
4142         u16 c = w & 0xff;
4143
4144         if (w & vc->vc_hi_font_mask)
4145                 c |= 0x100;
4146         return c;
4147 }
4148 EXPORT_SYMBOL_GPL(screen_glyph);
4149
4150 /* used by vcs - note the word offset */
4151 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4152 {
4153         return screenpos(vc, 2 * w_offset, viewed);
4154 }
4155
4156 void getconsxy(struct vc_data *vc, unsigned char *p)
4157 {
4158         p[0] = vc->vc_x;
4159         p[1] = vc->vc_y;
4160 }
4161
4162 void putconsxy(struct vc_data *vc, unsigned char *p)
4163 {
4164         hide_cursor(vc);
4165         gotoxy(vc, p[0], p[1]);
4166         set_cursor(vc);
4167 }
4168
4169 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4170 {
4171         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4172                 return softcursor_original;
4173         return scr_readw(org);
4174 }
4175
4176 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4177 {
4178         scr_writew(val, org);
4179         if ((unsigned long)org == vc->vc_pos) {
4180                 softcursor_original = -1;
4181                 add_softcursor(vc);
4182         }
4183 }
4184
4185 void vcs_scr_updated(struct vc_data *vc)
4186 {
4187         notify_update(vc);
4188 }
4189
4190 /*
4191  *      Visible symbols for modules
4192  */
4193
4194 EXPORT_SYMBOL(color_table);
4195 EXPORT_SYMBOL(default_red);
4196 EXPORT_SYMBOL(default_grn);
4197 EXPORT_SYMBOL(default_blu);
4198 EXPORT_SYMBOL(update_region);
4199 EXPORT_SYMBOL(redraw_screen);
4200 EXPORT_SYMBOL(vc_resize);
4201 EXPORT_SYMBOL(fg_console);
4202 EXPORT_SYMBOL(console_blank_hook);
4203 EXPORT_SYMBOL(console_blanked);
4204 EXPORT_SYMBOL(vc_cons);
4205 EXPORT_SYMBOL(global_cursor_default);
4206 #ifndef VT_SINGLE_DRIVER
4207 EXPORT_SYMBOL(take_over_console);
4208 EXPORT_SYMBOL(give_up_console);
4209 #endif