drivers/tty/vt/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  * /sys/class/tty/tty0/
 240  *
 241  * the attribute 'active' contains the name of the current vc
 242  * console and it supports poll() to detect vc switches
 243  */
 244 static struct device *tty0dev;
 245
 246 /*
 247  * Notifier list for console events.
 248  */
 249 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 250
 251 int register_vt_notifier(struct notifier_block *nb)
 252 {
 253         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 254 }
 255 EXPORT_SYMBOL_GPL(register_vt_notifier);
 256
 257 int unregister_vt_notifier(struct notifier_block *nb)
 258 {
 259         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 260 }
 261 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 262
 263 static void notify_write(struct vc_data *vc, unsigned int unicode)
 264 {
 265         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 266         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 267 }
 268
 269 static void notify_update(struct vc_data *vc)
 270 {
 271         struct vt_notifier_param param = { .vc = vc };
 272         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 273 }
 274 /*
 275  *      Low-Level Functions
 276  */
 277
 278 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 279
 280 #ifdef VT_BUF_VRAM_ONLY
 281 #define DO_UPDATE(vc)   0
 282 #else
 283 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 284 #endif
 285
 286 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 287 {
 288         unsigned short *p;
 289
 290         if (!viewed)
 291                 p = (unsigned short *)(vc->vc_origin + offset);
 292         else if (!vc->vc_sw->con_screen_pos)
 293                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 294         else
 295                 p = vc->vc_sw->con_screen_pos(vc, offset);
 296         return p;
 297 }
 298
 299 /* Called  from the keyboard irq path.. */
 300 static inline void scrolldelta(int lines)
 301 {
 302         /* FIXME */
 303         /* scrolldelta needs some kind of consistency lock, but the BKL was
 304            and still is not protecting versus the scheduled back end */
 305         scrollback_delta += lines;
 306         schedule_console_callback();
 307 }
 308
 309 void schedule_console_callback(void)
 310 {
 311         schedule_work(&console_work);
 312 }
 313
 314 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 315 {
 316         unsigned short *d, *s;
 317
 318         if (t+nr >= b)
 319                 nr = b - t - 1;
 320         if (b > vc->vc_rows || t >= b || nr < 1)
 321                 return;
 322         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 323                 return;
 324         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 325         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 326         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 327         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 328                     vc->vc_size_row * nr);
 329 }
 330
 331 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 332 {
 333         unsigned short *s;
 334         unsigned int step;
 335
 336         if (t+nr >= b)
 337                 nr = b - t - 1;
 338         if (b > vc->vc_rows || t >= b || nr < 1)
 339                 return;
 340         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 341                 return;
 342         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 343         step = vc->vc_cols * nr;
 344         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 345         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 346 }
 347
 348 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 349 {
 350 #ifndef VT_BUF_VRAM_ONLY
 351         unsigned int xx, yy, offset;
 352         u16 *p;
 353
 354         p = (u16 *) start;
 355         if (!vc->vc_sw->con_getxy) {
 356                 offset = (start - vc->vc_origin) / 2;
 357                 xx = offset % vc->vc_cols;
 358                 yy = offset / vc->vc_cols;
 359         } else {
 360                 int nxx, nyy;
 361                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 362                 xx = nxx; yy = nyy;
 363         }
 364         for(;;) {
 365                 u16 attrib = scr_readw(p) & 0xff00;
 366                 int startx = xx;
 367                 u16 *q = p;
 368                 while (xx < vc->vc_cols && count) {
 369                         if (attrib != (scr_readw(p) & 0xff00)) {
 370                                 if (p > q)
 371                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 372                                 startx = xx;
 373                                 q = p;
 374                                 attrib = scr_readw(p) & 0xff00;
 375                         }
 376                         p++;
 377                         xx++;
 378                         count--;
 379                 }
 380                 if (p > q)
 381                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 382                 if (!count)
 383                         break;
 384                 xx = 0;
 385                 yy++;
 386                 if (vc->vc_sw->con_getxy) {
 387                         p = (u16 *)start;
 388                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 389                 }
 390         }
 391 #endif
 392 }
 393
 394 void update_region(struct vc_data *vc, unsigned long start, int count)
 395 {
 396         WARN_CONSOLE_UNLOCKED();
 397
 398         if (DO_UPDATE(vc)) {
 399                 hide_cursor(vc);
 400                 do_update_region(vc, start, count);
 401                 set_cursor(vc);
 402         }
 403 }
 404
 405 /* Structure of attributes is hardware-dependent */
 406
 407 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 408     u8 _underline, u8 _reverse, u8 _italic)
 409 {
 410         if (vc->vc_sw->con_build_attr)
 411                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 412                        _blink, _underline, _reverse, _italic);
 413
 414 #ifndef VT_BUF_VRAM_ONLY
 415 /*
 416  * ++roman: I completely changed the attribute format for monochrome
 417  * mode (!can_do_color). The formerly used MDA (monochrome display
 418  * adapter) format didn't allow the combination of certain effects.
 419  * Now the attribute is just a bit vector:
 420  *  Bit 0..1: intensity (0..2)
 421  *  Bit 2   : underline
 422  *  Bit 3   : reverse
 423  *  Bit 7   : blink
 424  */
 425         {
 426         u8 a = _color;
 427         if (!vc->vc_can_do_color)
 428                 return _intensity |
 429                        (_italic ? 2 : 0) |
 430                        (_underline ? 4 : 0) |
 431                        (_reverse ? 8 : 0) |
 432                        (_blink ? 0x80 : 0);
 433         if (_italic)
 434                 a = (a & 0xF0) | vc->vc_itcolor;
 435         else if (_underline)
 436                 a = (a & 0xf0) | vc->vc_ulcolor;
 437         else if (_intensity == 0)
 438                 a = (a & 0xf0) | vc->vc_ulcolor;
 439         if (_reverse)
 440                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 441         if (_blink)
 442                 a ^= 0x80;
 443         if (_intensity == 2)
 444                 a ^= 0x08;
 445         if (vc->vc_hi_font_mask == 0x100)
 446                 a <<= 1;
 447         return a;
 448         }
 449 #else
 450         return 0;
 451 #endif
 452 }
 453
 454 static void update_attr(struct vc_data *vc)
 455 {
 456         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 457                       vc->vc_blink, vc->vc_underline,
 458                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 459         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 460 }
 461
 462 /* Note: inverting the screen twice should revert to the original state */
 463 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 464 {
 465         unsigned short *p;
 466
 467         WARN_CONSOLE_UNLOCKED();
 468
 469         count /= 2;
 470         p = screenpos(vc, offset, viewed);
 471         if (vc->vc_sw->con_invert_region)
 472                 vc->vc_sw->con_invert_region(vc, p, count);
 473 #ifndef VT_BUF_VRAM_ONLY
 474         else {
 475                 u16 *q = p;
 476                 int cnt = count;
 477                 u16 a;
 478
 479                 if (!vc->vc_can_do_color) {
 480                         while (cnt--) {
 481                             a = scr_readw(q);
 482                             a ^= 0x0800;
 483                             scr_writew(a, q);
 484                             q++;
 485                         }
 486                 } else if (vc->vc_hi_font_mask == 0x100) {
 487                         while (cnt--) {
 488                                 a = scr_readw(q);
 489                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 490                                 scr_writew(a, q);
 491                                 q++;
 492                         }
 493                 } else {
 494                         while (cnt--) {
 495                                 a = scr_readw(q);
 496                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 497                                 scr_writew(a, q);
 498                                 q++;
 499                         }
 500                 }
 501         }
 502 #endif
 503         if (DO_UPDATE(vc))
 504                 do_update_region(vc, (unsigned long) p, count);
 505 }
 506
 507 /* used by selection: complement pointer position */
 508 void complement_pos(struct vc_data *vc, int offset)
 509 {
 510         static int old_offset = -1;
 511         static unsigned short old;
 512         static unsigned short oldx, oldy;
 513
 514         WARN_CONSOLE_UNLOCKED();
 515
 516         if (old_offset != -1 && old_offset >= 0 &&
 517             old_offset < vc->vc_screenbuf_size) {
 518                 scr_writew(old, screenpos(vc, old_offset, 1));
 519                 if (DO_UPDATE(vc))
 520                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 521         }
 522
 523         old_offset = offset;
 524
 525         if (offset != -1 && offset >= 0 &&
 526             offset < vc->vc_screenbuf_size) {
 527                 unsigned short new;
 528                 unsigned short *p;
 529                 p = screenpos(vc, offset, 1);
 530                 old = scr_readw(p);
 531                 new = old ^ vc->vc_complement_mask;
 532                 scr_writew(new, p);
 533                 if (DO_UPDATE(vc)) {
 534                         oldx = (offset >> 1) % vc->vc_cols;
 535                         oldy = (offset >> 1) / vc->vc_cols;
 536                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 537                 }
 538         }
 539
 540 }
 541
 542 static void insert_char(struct vc_data *vc, unsigned int nr)
 543 {
 544         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 545
 546         p = q + vc->vc_cols - nr - vc->vc_x;
 547         while (--p >= q)
 548                 scr_writew(scr_readw(p), p + nr);
 549         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 550         vc->vc_need_wrap = 0;
 551         if (DO_UPDATE(vc)) {
 552                 unsigned short oldattr = vc->vc_attr;
 553                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 554                                      vc->vc_cols - vc->vc_x - nr);
 555                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 556                 while (nr--)
 557                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 558                 vc->vc_attr = oldattr;
 559         }
 560 }
 561
 562 static void delete_char(struct vc_data *vc, unsigned int nr)
 563 {
 564         unsigned int i = vc->vc_x;
 565         unsigned short *p = (unsigned short *)vc->vc_pos;
 566
 567         while (++i <= vc->vc_cols - nr) {
 568                 scr_writew(scr_readw(p+nr), p);
 569                 p++;
 570         }
 571         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 572         vc->vc_need_wrap = 0;
 573         if (DO_UPDATE(vc)) {
 574                 unsigned short oldattr = vc->vc_attr;
 575                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 576                                      vc->vc_cols - vc->vc_x - nr);
 577                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 578                 while (nr--)
 579                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 580                                      vc->vc_cols - 1 - nr);
 581                 vc->vc_attr = oldattr;
 582         }
 583 }
 584
 585 static int softcursor_original;
 586
 587 static void add_softcursor(struct vc_data *vc)
 588 {
 589         int i = scr_readw((u16 *) vc->vc_pos);
 590         u32 type = vc->vc_cursor_type;
 591
 592         if (! (type & 0x10)) return;
 593         if (softcursor_original != -1) return;
 594         softcursor_original = i;
 595         i |= ((type >> 8) & 0xff00 );
 596         i ^= ((type) & 0xff00 );
 597         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 598         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 599         scr_writew(i, (u16 *) vc->vc_pos);
 600         if (DO_UPDATE(vc))
 601                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 602 }
 603
 604 static void hide_softcursor(struct vc_data *vc)
 605 {
 606         if (softcursor_original != -1) {
 607                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 608                 if (DO_UPDATE(vc))
 609                         vc->vc_sw->con_putc(vc, softcursor_original,
 610                                         vc->vc_y, vc->vc_x);
 611                 softcursor_original = -1;
 612         }
 613 }
 614
 615 static void hide_cursor(struct vc_data *vc)
 616 {
 617         if (vc == sel_cons)
 618                 clear_selection();
 619         vc->vc_sw->con_cursor(vc, CM_ERASE);
 620         hide_softcursor(vc);
 621 }
 622
 623 static void set_cursor(struct vc_data *vc)
 624 {
 625         if (!IS_FG(vc) || console_blanked ||
 626             vc->vc_mode == KD_GRAPHICS)
 627                 return;
 628         if (vc->vc_deccm) {
 629                 if (vc == sel_cons)
 630                         clear_selection();
 631                 add_softcursor(vc);
 632                 if ((vc->vc_cursor_type & 0x0f) != 1)
 633                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 634         } else
 635                 hide_cursor(vc);
 636 }
 637
 638 static void set_origin(struct vc_data *vc)
 639 {
 640         WARN_CONSOLE_UNLOCKED();
 641
 642         if (!CON_IS_VISIBLE(vc) ||
 643             !vc->vc_sw->con_set_origin ||
 644             !vc->vc_sw->con_set_origin(vc))
 645                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 646         vc->vc_visible_origin = vc->vc_origin;
 647         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 648         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 649 }
 650
 651 static inline void save_screen(struct vc_data *vc)
 652 {
 653         WARN_CONSOLE_UNLOCKED();
 654
 655         if (vc->vc_sw->con_save_screen)
 656                 vc->vc_sw->con_save_screen(vc);
 657 }
 658
 659 /*
 660  *      Redrawing of screen
 661  */
 662
 663 static void clear_buffer_attributes(struct vc_data *vc)
 664 {
 665         unsigned short *p = (unsigned short *)vc->vc_origin;
 666         int count = vc->vc_screenbuf_size / 2;
 667         int mask = vc->vc_hi_font_mask | 0xff;
 668
 669         for (; count > 0; count--, p++) {
 670                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 671         }
 672 }
 673
 674 void redraw_screen(struct vc_data *vc, int is_switch)
 675 {
 676         int redraw = 0;
 677
 678         WARN_CONSOLE_UNLOCKED();
 679
 680         if (!vc) {
 681                 /* strange ... */
 682                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 683                 return;
 684         }
 685
 686         if (is_switch) {
 687                 struct vc_data *old_vc = vc_cons[fg_console].d;
 688                 if (old_vc == vc)
 689                         return;
 690                 if (!CON_IS_VISIBLE(vc))
 691                         redraw = 1;
 692                 *vc->vc_display_fg = vc;
 693                 fg_console = vc->vc_num;
 694                 hide_cursor(old_vc);
 695                 if (!CON_IS_VISIBLE(old_vc)) {
 696                         save_screen(old_vc);
 697                         set_origin(old_vc);
 698                 }
 699                 if (tty0dev)
 700                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 701         } else {
 702                 hide_cursor(vc);
 703                 redraw = 1;
 704         }
 705
 706         if (redraw) {
 707                 int update;
 708                 int old_was_color = vc->vc_can_do_color;
 709
 710                 set_origin(vc);
 711                 update = vc->vc_sw->con_switch(vc);
 712                 set_palette(vc);
 713                 /*
 714                  * If console changed from mono<->color, the best we can do
 715                  * is to clear the buffer attributes. As it currently stands,
 716                  * rebuilding new attributes from the old buffer is not doable
 717                  * without overly complex code.
 718                  */
 719                 if (old_was_color != vc->vc_can_do_color) {
 720                         update_attr(vc);
 721                         clear_buffer_attributes(vc);
 722                 }
 723
 724                 /* Forcibly update if we're panicing */
 725                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 726                     vt_force_oops_output(vc))
 727                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 728         }
 729         set_cursor(vc);
 730         if (is_switch) {
 731                 set_leds();
 732                 compute_shiftstate();
 733                 notify_update(vc);
 734         }
 735 }
 736
 737 /*
 738  *      Allocation, freeing and resizing of VTs.
 739  */
 740
 741 int vc_cons_allocated(unsigned int i)
 742 {
 743         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 744 }
 745
 746 static void visual_init(struct vc_data *vc, int num, int init)
 747 {
 748         /* ++Geert: vc->vc_sw->con_init determines console size */
 749         if (vc->vc_sw)
 750                 module_put(vc->vc_sw->owner);
 751         vc->vc_sw = conswitchp;
 752 #ifndef VT_SINGLE_DRIVER
 753         if (con_driver_map[num])
 754                 vc->vc_sw = con_driver_map[num];
 755 #endif
 756         __module_get(vc->vc_sw->owner);
 757         vc->vc_num = num;
 758         vc->vc_display_fg = &master_display_fg;
 759         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 760         vc->vc_uni_pagedir = 0;
 761         vc->vc_hi_font_mask = 0;
 762         vc->vc_complement_mask = 0;
 763         vc->vc_can_do_color = 0;
 764         vc->vc_panic_force_write = false;
 765         vc->vc_sw->con_init(vc, init);
 766         if (!vc->vc_complement_mask)
 767                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 768         vc->vc_s_complement_mask = vc->vc_complement_mask;
 769         vc->vc_size_row = vc->vc_cols << 1;
 770         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 771 }
 772
 773 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 774 {
 775         WARN_CONSOLE_UNLOCKED();
 776
 777         if (currcons >= MAX_NR_CONSOLES)
 778                 return -ENXIO;
 779         if (!vc_cons[currcons].d) {
 780             struct vc_data *vc;
 781             struct vt_notifier_param param;
 782
 783             /* prevent users from taking too much memory */
 784             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 785               return -EPERM;
 786
 787             /* due to the granularity of kmalloc, we waste some memory here */
 788             /* the alloc is done in two steps, to optimize the common situation
 789                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 790             /* although the numbers above are not valid since long ago, the
 791                point is still up-to-date and the comment still has its value
 792                even if only as a historical artifact.  --mj, July 1998 */
 793             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 794             if (!vc)
 795                 return -ENOMEM;
 796             vc_cons[currcons].d = vc;
 797             tty_port_init(&vc->port);
 798             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 799             visual_init(vc, currcons, 1);
 800             if (!*vc->vc_uni_pagedir_loc)
 801                 con_set_default_unimap(vc);
 802             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 803             if (!vc->vc_screenbuf) {
 804                 kfree(vc);
 805                 vc_cons[currcons].d = NULL;
 806                 return -ENOMEM;
 807             }
 808
 809             /* If no drivers have overridden us and the user didn't pass a
 810                boot option, default to displaying the cursor */
 811             if (global_cursor_default == -1)
 812                     global_cursor_default = 1;
 813
 814             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 815             vcs_make_sysfs(currcons);
 816             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 817         }
 818         return 0;
 819 }
 820
 821 static inline int resize_screen(struct vc_data *vc, int width, int height,
 822                                 int user)
 823 {
 824         /* Resizes the resolution of the display adapater */
 825         int err = 0;
 826
 827         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 828                 err = vc->vc_sw->con_resize(vc, width, height, user);
 829
 830         return err;
 831 }
 832
 833 /*
 834  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 835  * [this is to be used together with some user program
 836  * like resize that changes the hardware videomode]
 837  */
 838 #define VC_RESIZE_MAXCOL (32767)
 839 #define VC_RESIZE_MAXROW (32767)
 840
 841 /**
 842  *      vc_do_resize    -       resizing method for the tty
 843  *      @tty: tty being resized
 844  *      @real_tty: real tty (different to tty if a pty/tty pair)
 845  *      @vc: virtual console private data
 846  *      @cols: columns
 847  *      @lines: lines
 848  *
 849  *      Resize a virtual console, clipping according to the actual constraints.
 850  *      If the caller passes a tty structure then update the termios winsize
 851  *      information and perform any necessary signal handling.
 852  *
 853  *      Caller must hold the console semaphore. Takes the termios mutex and
 854  *      ctrl_lock of the tty IFF a tty is passed.
 855  */
 856
 857 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 858                                 unsigned int cols, unsigned int lines)
 859 {
 860         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 861         unsigned long end;
 862         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 863         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 864         unsigned int user;
 865         unsigned short *newscreen;
 866
 867         WARN_CONSOLE_UNLOCKED();
 868
 869         if (!vc)
 870                 return -ENXIO;
 871
 872         user = vc->vc_resize_user;
 873         vc->vc_resize_user = 0;
 874
 875         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 876                 return -EINVAL;
 877
 878         new_cols = (cols ? cols : vc->vc_cols);
 879         new_rows = (lines ? lines : vc->vc_rows);
 880         new_row_size = new_cols << 1;
 881         new_screen_size = new_row_size * new_rows;
 882
 883         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 884                 return 0;
 885
 886         newscreen = kmalloc(new_screen_size, GFP_USER);
 887         if (!newscreen)
 888                 return -ENOMEM;
 889
 890         old_rows = vc->vc_rows;
 891         old_cols = vc->vc_cols;
 892         old_row_size = vc->vc_size_row;
 893         old_screen_size = vc->vc_screenbuf_size;
 894
 895         err = resize_screen(vc, new_cols, new_rows, user);
 896         if (err) {
 897                 kfree(newscreen);
 898                 return err;
 899         }
 900
 901         vc->vc_rows = new_rows;
 902         vc->vc_cols = new_cols;
 903         vc->vc_size_row = new_row_size;
 904         vc->vc_screenbuf_size = new_screen_size;
 905
 906         rlth = min(old_row_size, new_row_size);
 907         rrem = new_row_size - rlth;
 908         old_origin = vc->vc_origin;
 909         new_origin = (long) newscreen;
 910         new_scr_end = new_origin + new_screen_size;
 911
 912         if (vc->vc_y > new_rows) {
 913                 if (old_rows - vc->vc_y < new_rows) {
 914                         /*
 915                          * Cursor near the bottom, copy contents from the
 916                          * bottom of buffer
 917                          */
 918                         old_origin += (old_rows - new_rows) * old_row_size;
 919                 } else {
 920                         /*
 921                          * Cursor is in no man's land, copy 1/2 screenful
 922                          * from the top and bottom of cursor position
 923                          */
 924                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 925                 }
 926         }
 927
 928         end = old_origin + old_row_size * min(old_rows, new_rows);
 929
 930         update_attr(vc);
 931
 932         while (old_origin < end) {
 933                 scr_memcpyw((unsigned short *) new_origin,
 934                             (unsigned short *) old_origin, rlth);
 935                 if (rrem)
 936                         scr_memsetw((void *)(new_origin + rlth),
 937                                     vc->vc_video_erase_char, rrem);
 938                 old_origin += old_row_size;
 939                 new_origin += new_row_size;
 940         }
 941         if (new_scr_end > new_origin)
 942                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 943                             new_scr_end - new_origin);
 944         kfree(vc->vc_screenbuf);
 945         vc->vc_screenbuf = newscreen;
 946         vc->vc_screenbuf_size = new_screen_size;
 947         set_origin(vc);
 948
 949         /* do part of a reset_terminal() */
 950         vc->vc_top = 0;
 951         vc->vc_bottom = vc->vc_rows;
 952         gotoxy(vc, vc->vc_x, vc->vc_y);
 953         save_cur(vc);
 954
 955         if (tty) {
 956                 /* Rewrite the requested winsize data with the actual
 957                    resulting sizes */
 958                 struct winsize ws;
 959                 memset(&ws, 0, sizeof(ws));
 960                 ws.ws_row = vc->vc_rows;
 961                 ws.ws_col = vc->vc_cols;
 962                 ws.ws_ypixel = vc->vc_scan_lines;
 963                 tty_do_resize(tty, &ws);
 964         }
 965
 966         if (CON_IS_VISIBLE(vc))
 967                 update_screen(vc);
 968         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 969         return err;
 970 }
 971
 972 /**
 973  *      vc_resize               -       resize a VT
 974  *      @vc: virtual console
 975  *      @cols: columns
 976  *      @rows: rows
 977  *
 978  *      Resize a virtual console as seen from the console end of things. We
 979  *      use the common vc_do_resize methods to update the structures. The
 980  *      caller must hold the console sem to protect console internals and
 981  *      vc->port.tty
 982  */
 983
 984 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 985 {
 986         return vc_do_resize(vc->port.tty, vc, cols, rows);
 987 }
 988
 989 /**
 990  *      vt_resize               -       resize a VT
 991  *      @tty: tty to resize
 992  *      @ws: winsize attributes
 993  *
 994  *      Resize a virtual terminal. This is called by the tty layer as we
 995  *      register our own handler for resizing. The mutual helper does all
 996  *      the actual work.
 997  *
 998  *      Takes the console sem and the called methods then take the tty
 999  *      termios_mutex and the tty ctrl_lock in that order.
1000  */
1001 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1002 {
1003         struct vc_data *vc = tty->driver_data;
1004         int ret;
1005
1006         console_lock();
1007         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1008         console_unlock();
1009         return ret;
1010 }
1011
1012 void vc_deallocate(unsigned int currcons)
1013 {
1014         WARN_CONSOLE_UNLOCKED();
1015
1016         if (vc_cons_allocated(currcons)) {
1017                 struct vc_data *vc = vc_cons[currcons].d;
1018                 struct vt_notifier_param param = { .vc = vc };
1019
1020                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1021                 vcs_remove_sysfs(currcons);
1022                 vc->vc_sw->con_deinit(vc);
1023                 put_pid(vc->vt_pid);
1024                 module_put(vc->vc_sw->owner);
1025                 kfree(vc->vc_screenbuf);
1026                 if (currcons >= MIN_NR_CONSOLES)
1027                         kfree(vc);
1028                 vc_cons[currcons].d = NULL;
1029         }
1030 }
1031
1032 /*
1033  *      VT102 emulator
1034  */
1035
1036 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1037 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1038 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1039
1040 #define decarm          VC_REPEAT
1041 #define decckm          VC_CKMODE
1042 #define kbdapplic       VC_APPLIC
1043 #define lnm             VC_CRLF
1044
1045 /*
1046  * this is what the terminal answers to a ESC-Z or csi0c query.
1047  */
1048 #define VT100ID "\033[?1;2c"
1049 #define VT102ID "\033[?6c"
1050
1051 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1052                                        8,12,10,14, 9,13,11,15 };
1053
1054 /* the default colour table, for VGA+ colour systems */
1055 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1056     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1057 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1058     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1059 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1060     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1061
1062 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1063 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1064 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1065
1066 /*
1067  * gotoxy() must verify all boundaries, because the arguments
1068  * might also be negative. If the given position is out of
1069  * bounds, the cursor is placed at the nearest margin.
1070  */
1071 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1072 {
1073         int min_y, max_y;
1074
1075         if (new_x < 0)
1076                 vc->vc_x = 0;
1077         else {
1078                 if (new_x >= vc->vc_cols)
1079                         vc->vc_x = vc->vc_cols - 1;
1080                 else
1081                         vc->vc_x = new_x;
1082         }
1083
1084         if (vc->vc_decom) {
1085                 min_y = vc->vc_top;
1086                 max_y = vc->vc_bottom;
1087         } else {
1088                 min_y = 0;
1089                 max_y = vc->vc_rows;
1090         }
1091         if (new_y < min_y)
1092                 vc->vc_y = min_y;
1093         else if (new_y >= max_y)
1094                 vc->vc_y = max_y - 1;
1095         else
1096                 vc->vc_y = new_y;
1097         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1098         vc->vc_need_wrap = 0;
1099 }
1100
1101 /* for absolute user moves, when decom is set */
1102 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1103 {
1104         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1105 }
1106
1107 void scrollback(struct vc_data *vc, int lines)
1108 {
1109         if (!lines)
1110                 lines = vc->vc_rows / 2;
1111         scrolldelta(-lines);
1112 }
1113
1114 void scrollfront(struct vc_data *vc, int lines)
1115 {
1116         if (!lines)
1117                 lines = vc->vc_rows / 2;
1118         scrolldelta(lines);
1119 }
1120
1121 static void lf(struct vc_data *vc)
1122 {
1123         /* don't scroll if above bottom of scrolling region, or
1124          * if below scrolling region
1125          */
1126         if (vc->vc_y + 1 == vc->vc_bottom)
1127                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1128         else if (vc->vc_y < vc->vc_rows - 1) {
1129                 vc->vc_y++;
1130                 vc->vc_pos += vc->vc_size_row;
1131         }
1132         vc->vc_need_wrap = 0;
1133         notify_write(vc, '\n');
1134 }
1135
1136 static void ri(struct vc_data *vc)
1137 {
1138         /* don't scroll if below top of scrolling region, or
1139          * if above scrolling region
1140          */
1141         if (vc->vc_y == vc->vc_top)
1142                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1143         else if (vc->vc_y > 0) {
1144                 vc->vc_y--;
1145                 vc->vc_pos -= vc->vc_size_row;
1146         }
1147         vc->vc_need_wrap = 0;
1148 }
1149
1150 static inline void cr(struct vc_data *vc)
1151 {
1152         vc->vc_pos -= vc->vc_x << 1;
1153         vc->vc_need_wrap = vc->vc_x = 0;
1154         notify_write(vc, '\r');
1155 }
1156
1157 static inline void bs(struct vc_data *vc)
1158 {
1159         if (vc->vc_x) {
1160                 vc->vc_pos -= 2;
1161                 vc->vc_x--;
1162                 vc->vc_need_wrap = 0;
1163                 notify_write(vc, '\b');
1164         }
1165 }
1166
1167 static inline void del(struct vc_data *vc)
1168 {
1169         /* ignored */
1170 }
1171
1172 static void csi_J(struct vc_data *vc, int vpar)
1173 {
1174         unsigned int count;
1175         unsigned short * start;
1176
1177         switch (vpar) {
1178                 case 0: /* erase from cursor to end of display */
1179                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1180                         start = (unsigned short *)vc->vc_pos;
1181                         if (DO_UPDATE(vc)) {
1182                                 /* do in two stages */
1183                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1184                                               vc->vc_cols - vc->vc_x);
1185                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1186                                               vc->vc_rows - vc->vc_y - 1,
1187                                               vc->vc_cols);
1188                         }
1189                         break;
1190                 case 1: /* erase from start to cursor */
1191                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1192                         start = (unsigned short *)vc->vc_origin;
1193                         if (DO_UPDATE(vc)) {
1194                                 /* do in two stages */
1195                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1196                                               vc->vc_cols);
1197                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1198                                               vc->vc_x + 1);
1199                         }
1200                         break;
1201                 case 2: /* erase whole display */
1202                         count = vc->vc_cols * vc->vc_rows;
1203                         start = (unsigned short *)vc->vc_origin;
1204                         if (DO_UPDATE(vc))
1205                                 vc->vc_sw->con_clear(vc, 0, 0,
1206                                               vc->vc_rows,
1207                                               vc->vc_cols);
1208                         break;
1209                 default:
1210                         return;
1211         }
1212         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1213         vc->vc_need_wrap = 0;
1214 }
1215
1216 static void csi_K(struct vc_data *vc, int vpar)
1217 {
1218         unsigned int count;
1219         unsigned short * start;
1220
1221         switch (vpar) {
1222                 case 0: /* erase from cursor to end of line */
1223                         count = vc->vc_cols - vc->vc_x;
1224                         start = (unsigned short *)vc->vc_pos;
1225                         if (DO_UPDATE(vc))
1226                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1227                                                      vc->vc_cols - vc->vc_x);
1228                         break;
1229                 case 1: /* erase from start of line to cursor */
1230                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1231                         count = vc->vc_x + 1;
1232                         if (DO_UPDATE(vc))
1233                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1234                                                      vc->vc_x + 1);
1235                         break;
1236                 case 2: /* erase whole line */
1237                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1238                         count = vc->vc_cols;
1239                         if (DO_UPDATE(vc))
1240                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1241                                               vc->vc_cols);
1242                         break;
1243                 default:
1244                         return;
1245         }
1246         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1247         vc->vc_need_wrap = 0;
1248 }
1249
1250 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1251 {                                         /* not vt100? */
1252         int count;
1253
1254         if (!vpar)
1255                 vpar++;
1256         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1257
1258         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1259         if (DO_UPDATE(vc))
1260                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1261         vc->vc_need_wrap = 0;
1262 }
1263
1264 static void default_attr(struct vc_data *vc)
1265 {
1266         vc->vc_intensity = 1;
1267         vc->vc_italic = 0;
1268         vc->vc_underline = 0;
1269         vc->vc_reverse = 0;
1270         vc->vc_blink = 0;
1271         vc->vc_color = vc->vc_def_color;
1272 }
1273
1274 /* console_lock is held */
1275 static void csi_m(struct vc_data *vc)
1276 {
1277         int i;
1278
1279         for (i = 0; i <= vc->vc_npar; i++)
1280                 switch (vc->vc_par[i]) {
1281                         case 0: /* all attributes off */
1282                                 default_attr(vc);
1283                                 break;
1284                         case 1:
1285                                 vc->vc_intensity = 2;
1286                                 break;
1287                         case 2:
1288                                 vc->vc_intensity = 0;
1289                                 break;
1290                         case 3:
1291                                 vc->vc_italic = 1;
1292                                 break;
1293                         case 4:
1294                                 vc->vc_underline = 1;
1295                                 break;
1296                         case 5:
1297                                 vc->vc_blink = 1;
1298                                 break;
1299                         case 7:
1300                                 vc->vc_reverse = 1;
1301                                 break;
1302                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1303                                   * Select primary font, don't display
1304                                   * control chars if defined, don't set
1305                                   * bit 8 on output.
1306                                   */
1307                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1308                                                 ? vc->vc_G0_charset
1309                                                 : vc->vc_G1_charset, vc);
1310                                 vc->vc_disp_ctrl = 0;
1311                                 vc->vc_toggle_meta = 0;
1312                                 break;
1313                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1314                                   * Select first alternate font, lets
1315                                   * chars < 32 be displayed as ROM chars.
1316                                   */
1317                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1318                                 vc->vc_disp_ctrl = 1;
1319                                 vc->vc_toggle_meta = 0;
1320                                 break;
1321                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1322                                   * Select second alternate font, toggle
1323                                   * high bit before displaying as ROM char.
1324                                   */
1325                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1326                                 vc->vc_disp_ctrl = 1;
1327                                 vc->vc_toggle_meta = 1;
1328                                 break;
1329                         case 21:
1330                         case 22:
1331                                 vc->vc_intensity = 1;
1332                                 break;
1333                         case 23:
1334                                 vc->vc_italic = 0;
1335                                 break;
1336                         case 24:
1337                                 vc->vc_underline = 0;
1338                                 break;
1339                         case 25:
1340                                 vc->vc_blink = 0;
1341                                 break;
1342                         case 27:
1343                                 vc->vc_reverse = 0;
1344                                 break;
1345                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1346                                   * Enables underscore, white foreground
1347                                   * with white underscore (Linux - use
1348                                   * default foreground).
1349                                   */
1350                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1351                                 vc->vc_underline = 1;
1352                                 break;
1353                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1354                                   * Disable underline option.
1355                                   * Reset colour to default? It did this
1356                                   * before...
1357                                   */
1358                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1359                                 vc->vc_underline = 0;
1360                                 break;
1361                         case 49:
1362                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1363                                 break;
1364                         default:
1365                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1366                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1367                                                 | (vc->vc_color & 0xf0);
1368                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1369                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1370                                                 | (vc->vc_color & 0x0f);
1371                                 break;
1372                 }
1373         update_attr(vc);
1374 }
1375
1376 static void respond_string(const char *p, struct tty_struct *tty)
1377 {
1378         while (*p) {
1379                 tty_insert_flip_char(tty, *p, 0);
1380                 p++;
1381         }
1382         con_schedule_flip(tty);
1383 }
1384
1385 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1386 {
1387         char buf[40];
1388
1389         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1390         respond_string(buf, tty);
1391 }
1392
1393 static inline void status_report(struct tty_struct *tty)
1394 {
1395         respond_string("\033[0n", tty); /* Terminal ok */
1396 }
1397
1398 static inline void respond_ID(struct tty_struct * tty)
1399 {
1400         respond_string(VT102ID, tty);
1401 }
1402
1403 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1404 {
1405         char buf[8];
1406
1407         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1408                 (char)('!' + mry));
1409         respond_string(buf, tty);
1410 }
1411
1412 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1413 int mouse_reporting(void)
1414 {
1415         return vc_cons[fg_console].d->vc_report_mouse;
1416 }
1417
1418 /* console_lock is held */
1419 static void set_mode(struct vc_data *vc, int on_off)
1420 {
1421         int i;
1422
1423         for (i = 0; i <= vc->vc_npar; i++)
1424                 if (vc->vc_ques) {
1425                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1426                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1427                                 if (on_off)
1428                                         set_kbd(vc, decckm);
1429                                 else
1430                                         clr_kbd(vc, decckm);
1431                                 break;
1432                         case 3: /* 80/132 mode switch unimplemented */
1433                                 vc->vc_deccolm = on_off;
1434 #if 0
1435                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1436                                 /* this alone does not suffice; some user mode
1437                                    utility has to change the hardware regs */
1438 #endif
1439                                 break;
1440                         case 5:                 /* Inverted screen on/off */
1441                                 if (vc->vc_decscnm != on_off) {
1442                                         vc->vc_decscnm = on_off;
1443                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1444                                         update_attr(vc);
1445                                 }
1446                                 break;
1447                         case 6:                 /* Origin relative/absolute */
1448                                 vc->vc_decom = on_off;
1449                                 gotoxay(vc, 0, 0);
1450                                 break;
1451                         case 7:                 /* Autowrap on/off */
1452                                 vc->vc_decawm = on_off;
1453                                 break;
1454                         case 8:                 /* Autorepeat on/off */
1455                                 if (on_off)
1456                                         set_kbd(vc, decarm);
1457                                 else
1458                                         clr_kbd(vc, decarm);
1459                                 break;
1460                         case 9:
1461                                 vc->vc_report_mouse = on_off ? 1 : 0;
1462                                 break;
1463                         case 25:                /* Cursor on/off */
1464                                 vc->vc_deccm = on_off;
1465                                 break;
1466                         case 1000:
1467                                 vc->vc_report_mouse = on_off ? 2 : 0;
1468                                 break;
1469                         }
1470                 } else {
1471                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1472                         case 3:                 /* Monitor (display ctrls) */
1473                                 vc->vc_disp_ctrl = on_off;
1474                                 break;
1475                         case 4:                 /* Insert Mode on/off */
1476                                 vc->vc_decim = on_off;
1477                                 break;
1478                         case 20:                /* Lf, Enter == CrLf/Lf */
1479                                 if (on_off)
1480                                         set_kbd(vc, lnm);
1481                                 else
1482                                         clr_kbd(vc, lnm);
1483                                 break;
1484                         }
1485                 }
1486 }
1487
1488 /* console_lock is held */
1489 static void setterm_command(struct vc_data *vc)
1490 {
1491         switch(vc->vc_par[0]) {
1492                 case 1: /* set color for underline mode */
1493                         if (vc->vc_can_do_color &&
1494                                         vc->vc_par[1] < 16) {
1495                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1496                                 if (vc->vc_underline)
1497                                         update_attr(vc);
1498                         }
1499                         break;
1500                 case 2: /* set color for half intensity mode */
1501                         if (vc->vc_can_do_color &&
1502                                         vc->vc_par[1] < 16) {
1503                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1504                                 if (vc->vc_intensity == 0)
1505                                         update_attr(vc);
1506                         }
1507                         break;
1508                 case 8: /* store colors as defaults */
1509                         vc->vc_def_color = vc->vc_attr;
1510                         if (vc->vc_hi_font_mask == 0x100)
1511                                 vc->vc_def_color >>= 1;
1512                         default_attr(vc);
1513                         update_attr(vc);
1514                         break;
1515                 case 9: /* set blanking interval */
1516                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1517                         poke_blanked_console();
1518                         break;
1519                 case 10: /* set bell frequency in Hz */
1520                         if (vc->vc_npar >= 1)
1521                                 vc->vc_bell_pitch = vc->vc_par[1];
1522                         else
1523                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1524                         break;
1525                 case 11: /* set bell duration in msec */
1526                         if (vc->vc_npar >= 1)
1527                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1528                                         vc->vc_par[1] * HZ / 1000 : 0;
1529                         else
1530                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1531                         break;
1532                 case 12: /* bring specified console to the front */
1533                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1534                                 set_console(vc->vc_par[1] - 1);
1535                         break;
1536                 case 13: /* unblank the screen */
1537                         poke_blanked_console();
1538                         break;
1539                 case 14: /* set vesa powerdown interval */
1540                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1541                         break;
1542                 case 15: /* activate the previous console */
1543                         set_console(last_console);
1544                         break;
1545         }
1546 }
1547
1548 /* console_lock is held */
1549 static void csi_at(struct vc_data *vc, unsigned int nr)
1550 {
1551         if (nr > vc->vc_cols - vc->vc_x)
1552                 nr = vc->vc_cols - vc->vc_x;
1553         else if (!nr)
1554                 nr = 1;
1555         insert_char(vc, nr);
1556 }
1557
1558 /* console_lock is held */
1559 static void csi_L(struct vc_data *vc, unsigned int nr)
1560 {
1561         if (nr > vc->vc_rows - vc->vc_y)
1562                 nr = vc->vc_rows - vc->vc_y;
1563         else if (!nr)
1564                 nr = 1;
1565         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1566         vc->vc_need_wrap = 0;
1567 }
1568
1569 /* console_lock is held */
1570 static void csi_P(struct vc_data *vc, unsigned int nr)
1571 {
1572         if (nr > vc->vc_cols - vc->vc_x)
1573                 nr = vc->vc_cols - vc->vc_x;
1574         else if (!nr)
1575                 nr = 1;
1576         delete_char(vc, nr);
1577 }
1578
1579 /* console_lock is held */
1580 static void csi_M(struct vc_data *vc, unsigned int nr)
1581 {
1582         if (nr > vc->vc_rows - vc->vc_y)
1583                 nr = vc->vc_rows - vc->vc_y;
1584         else if (!nr)
1585                 nr=1;
1586         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1587         vc->vc_need_wrap = 0;
1588 }
1589
1590 /* console_lock is held (except via vc_init->reset_terminal */
1591 static void save_cur(struct vc_data *vc)
1592 {
1593         vc->vc_saved_x          = vc->vc_x;
1594         vc->vc_saved_y          = vc->vc_y;
1595         vc->vc_s_intensity      = vc->vc_intensity;
1596         vc->vc_s_italic         = vc->vc_italic;
1597         vc->vc_s_underline      = vc->vc_underline;
1598         vc->vc_s_blink          = vc->vc_blink;
1599         vc->vc_s_reverse        = vc->vc_reverse;
1600         vc->vc_s_charset        = vc->vc_charset;
1601         vc->vc_s_color          = vc->vc_color;
1602         vc->vc_saved_G0         = vc->vc_G0_charset;
1603         vc->vc_saved_G1         = vc->vc_G1_charset;
1604 }
1605
1606 /* console_lock is held */
1607 static void restore_cur(struct vc_data *vc)
1608 {
1609         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1610         vc->vc_intensity        = vc->vc_s_intensity;
1611         vc->vc_italic           = vc->vc_s_italic;
1612         vc->vc_underline        = vc->vc_s_underline;
1613         vc->vc_blink            = vc->vc_s_blink;
1614         vc->vc_reverse          = vc->vc_s_reverse;
1615         vc->vc_charset          = vc->vc_s_charset;
1616         vc->vc_color            = vc->vc_s_color;
1617         vc->vc_G0_charset       = vc->vc_saved_G0;
1618         vc->vc_G1_charset       = vc->vc_saved_G1;
1619         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1620         update_attr(vc);
1621         vc->vc_need_wrap = 0;
1622 }
1623
1624 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1625         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1626         ESpalette };
1627
1628 /* console_lock is held (except via vc_init()) */
1629 static void reset_terminal(struct vc_data *vc, int do_clear)
1630 {
1631         vc->vc_top              = 0;
1632         vc->vc_bottom           = vc->vc_rows;
1633         vc->vc_state            = ESnormal;
1634         vc->vc_ques             = 0;
1635         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1636         vc->vc_G0_charset       = LAT1_MAP;
1637         vc->vc_G1_charset       = GRAF_MAP;
1638         vc->vc_charset          = 0;
1639         vc->vc_need_wrap        = 0;
1640         vc->vc_report_mouse     = 0;
1641         vc->vc_utf              = default_utf8;
1642         vc->vc_utf_count        = 0;
1643
1644         vc->vc_disp_ctrl        = 0;
1645         vc->vc_toggle_meta      = 0;
1646
1647         vc->vc_decscnm          = 0;
1648         vc->vc_decom            = 0;
1649         vc->vc_decawm           = 1;
1650         vc->vc_deccm            = global_cursor_default;
1651         vc->vc_decim            = 0;
1652
1653         set_kbd(vc, decarm);
1654         clr_kbd(vc, decckm);
1655         clr_kbd(vc, kbdapplic);
1656         clr_kbd(vc, lnm);
1657         kbd_table[vc->vc_num].lockstate = 0;
1658         kbd_table[vc->vc_num].slockstate = 0;
1659         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1660         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1661         /* do not do set_leds here because this causes an endless tasklet loop
1662            when the keyboard hasn't been initialized yet */
1663
1664         vc->vc_cursor_type = cur_default;
1665         vc->vc_complement_mask = vc->vc_s_complement_mask;
1666
1667         default_attr(vc);
1668         update_attr(vc);
1669
1670         vc->vc_tab_stop[0]      = 0x01010100;
1671         vc->vc_tab_stop[1]      =
1672         vc->vc_tab_stop[2]      =
1673         vc->vc_tab_stop[3]      =
1674         vc->vc_tab_stop[4]      =
1675         vc->vc_tab_stop[5]      =
1676         vc->vc_tab_stop[6]      =
1677         vc->vc_tab_stop[7]      = 0x01010101;
1678
1679         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1680         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1681
1682         gotoxy(vc, 0, 0);
1683         save_cur(vc);
1684         if (do_clear)
1685             csi_J(vc, 2);
1686 }
1687
1688 /* console_lock is held */
1689 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1690 {
1691         /*
1692          *  Control characters can be used in the _middle_
1693          *  of an escape sequence.
1694          */
1695         switch (c) {
1696         case 0:
1697                 return;
1698         case 7:
1699                 if (vc->vc_bell_duration)
1700                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1701                 return;
1702         case 8:
1703                 bs(vc);
1704                 return;
1705         case 9:
1706                 vc->vc_pos -= (vc->vc_x << 1);
1707                 while (vc->vc_x < vc->vc_cols - 1) {
1708                         vc->vc_x++;
1709                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1710                                 break;
1711                 }
1712                 vc->vc_pos += (vc->vc_x << 1);
1713                 notify_write(vc, '\t');
1714                 return;
1715         case 10: case 11: case 12:
1716                 lf(vc);
1717                 if (!is_kbd(vc, lnm))
1718                         return;
1719         case 13:
1720                 cr(vc);
1721                 return;
1722         case 14:
1723                 vc->vc_charset = 1;
1724                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1725                 vc->vc_disp_ctrl = 1;
1726                 return;
1727         case 15:
1728                 vc->vc_charset = 0;
1729                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1730                 vc->vc_disp_ctrl = 0;
1731                 return;
1732         case 24: case 26:
1733                 vc->vc_state = ESnormal;
1734                 return;
1735         case 27:
1736                 vc->vc_state = ESesc;
1737                 return;
1738         case 127:
1739                 del(vc);
1740                 return;
1741         case 128+27:
1742                 vc->vc_state = ESsquare;
1743                 return;
1744         }
1745         switch(vc->vc_state) {
1746         case ESesc:
1747                 vc->vc_state = ESnormal;
1748                 switch (c) {
1749                 case '[':
1750                         vc->vc_state = ESsquare;
1751                         return;
1752                 case ']':
1753                         vc->vc_state = ESnonstd;
1754                         return;
1755                 case '%':
1756                         vc->vc_state = ESpercent;
1757                         return;
1758                 case 'E':
1759                         cr(vc);
1760                         lf(vc);
1761                         return;
1762                 case 'M':
1763                         ri(vc);
1764                         return;
1765                 case 'D':
1766                         lf(vc);
1767                         return;
1768                 case 'H':
1769                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1770                         return;
1771                 case 'Z':
1772                         respond_ID(tty);
1773                         return;
1774                 case '7':
1775                         save_cur(vc);
1776                         return;
1777                 case '8':
1778                         restore_cur(vc);
1779                         return;
1780                 case '(':
1781                         vc->vc_state = ESsetG0;
1782                         return;
1783                 case ')':
1784                         vc->vc_state = ESsetG1;
1785                         return;
1786                 case '#':
1787                         vc->vc_state = EShash;
1788                         return;
1789                 case 'c':
1790                         reset_terminal(vc, 1);
1791                         return;
1792                 case '>':  /* Numeric keypad */
1793                         clr_kbd(vc, kbdapplic);
1794                         return;
1795                 case '=':  /* Appl. keypad */
1796                         set_kbd(vc, kbdapplic);
1797                         return;
1798                 }
1799                 return;
1800         case ESnonstd:
1801                 if (c=='P') {   /* palette escape sequence */
1802                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1803                                 vc->vc_par[vc->vc_npar] = 0;
1804                         vc->vc_npar = 0;
1805                         vc->vc_state = ESpalette;
1806                         return;
1807                 } else if (c=='R') {   /* reset palette */
1808                         reset_palette(vc);
1809                         vc->vc_state = ESnormal;
1810                 } else
1811                         vc->vc_state = ESnormal;
1812                 return;
1813         case ESpalette:
1814                 if (isxdigit(c)) {
1815                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1816                         if (vc->vc_npar == 7) {
1817                                 int i = vc->vc_par[0] * 3, j = 1;
1818                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1819                                 vc->vc_palette[i++] += vc->vc_par[j++];
1820                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1821                                 vc->vc_palette[i++] += vc->vc_par[j++];
1822                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1823                                 vc->vc_palette[i] += vc->vc_par[j];
1824                                 set_palette(vc);
1825                                 vc->vc_state = ESnormal;
1826                         }
1827                 } else
1828                         vc->vc_state = ESnormal;
1829                 return;
1830         case ESsquare:
1831                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1832                         vc->vc_par[vc->vc_npar] = 0;
1833                 vc->vc_npar = 0;
1834                 vc->vc_state = ESgetpars;
1835                 if (c == '[') { /* Function key */
1836                         vc->vc_state=ESfunckey;
1837                         return;
1838                 }
1839                 vc->vc_ques = (c == '?');
1840                 if (vc->vc_ques)
1841                         return;
1842         case ESgetpars:
1843                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1844                         vc->vc_npar++;
1845                         return;
1846                 } else if (c>='0' && c<='9') {
1847                         vc->vc_par[vc->vc_npar] *= 10;
1848                         vc->vc_par[vc->vc_npar] += c - '0';
1849                         return;
1850                 } else
1851                         vc->vc_state = ESgotpars;
1852         case ESgotpars:
1853                 vc->vc_state = ESnormal;
1854                 switch(c) {
1855                 case 'h':
1856                         set_mode(vc, 1);
1857                         return;
1858                 case 'l':
1859                         set_mode(vc, 0);
1860                         return;
1861                 case 'c':
1862                         if (vc->vc_ques) {
1863                                 if (vc->vc_par[0])
1864                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1865                                 else
1866                                         vc->vc_cursor_type = cur_default;
1867                                 return;
1868                         }
1869                         break;
1870                 case 'm':
1871                         if (vc->vc_ques) {
1872                                 clear_selection();
1873                                 if (vc->vc_par[0])
1874                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1875                                 else
1876                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1877                                 return;
1878                         }
1879                         break;
1880                 case 'n':
1881                         if (!vc->vc_ques) {
1882                                 if (vc->vc_par[0] == 5)
1883                                         status_report(tty);
1884                                 else if (vc->vc_par[0] == 6)
1885                                         cursor_report(vc, tty);
1886                         }
1887                         return;
1888                 }
1889                 if (vc->vc_ques) {
1890                         vc->vc_ques = 0;
1891                         return;
1892                 }
1893                 switch(c) {
1894                 case 'G': case '`':
1895                         if (vc->vc_par[0])
1896                                 vc->vc_par[0]--;
1897                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1898                         return;
1899                 case 'A':
1900                         if (!vc->vc_par[0])
1901                                 vc->vc_par[0]++;
1902                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1903                         return;
1904                 case 'B': case 'e':
1905                         if (!vc->vc_par[0])
1906                                 vc->vc_par[0]++;
1907                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1908                         return;
1909                 case 'C': case 'a':
1910                         if (!vc->vc_par[0])
1911                                 vc->vc_par[0]++;
1912                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1913                         return;
1914                 case 'D':
1915                         if (!vc->vc_par[0])
1916                                 vc->vc_par[0]++;
1917                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1918                         return;
1919                 case 'E':
1920                         if (!vc->vc_par[0])
1921                                 vc->vc_par[0]++;
1922                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1923                         return;
1924                 case 'F':
1925                         if (!vc->vc_par[0])
1926                                 vc->vc_par[0]++;
1927                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1928                         return;
1929                 case 'd':
1930                         if (vc->vc_par[0])
1931                                 vc->vc_par[0]--;
1932                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1933                         return;
1934                 case 'H': case 'f':
1935                         if (vc->vc_par[0])
1936                                 vc->vc_par[0]--;
1937                         if (vc->vc_par[1])
1938                                 vc->vc_par[1]--;
1939                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1940                         return;
1941                 case 'J':
1942                         csi_J(vc, vc->vc_par[0]);
1943                         return;
1944                 case 'K':
1945                         csi_K(vc, vc->vc_par[0]);
1946                         return;
1947                 case 'L':
1948                         csi_L(vc, vc->vc_par[0]);
1949                         return;
1950                 case 'M':
1951                         csi_M(vc, vc->vc_par[0]);
1952                         return;
1953                 case 'P':
1954                         csi_P(vc, vc->vc_par[0]);
1955                         return;
1956                 case 'c':
1957                         if (!vc->vc_par[0])
1958                                 respond_ID(tty);
1959                         return;
1960                 case 'g':
1961                         if (!vc->vc_par[0])
1962                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1963                         else if (vc->vc_par[0] == 3) {
1964                                 vc->vc_tab_stop[0] =
1965                                         vc->vc_tab_stop[1] =
1966                                         vc->vc_tab_stop[2] =
1967                                         vc->vc_tab_stop[3] =
1968                                         vc->vc_tab_stop[4] =
1969                                         vc->vc_tab_stop[5] =
1970                                         vc->vc_tab_stop[6] =
1971                                         vc->vc_tab_stop[7] = 0;
1972                         }
1973                         return;
1974                 case 'm':
1975                         csi_m(vc);
1976                         return;
1977                 case 'q': /* DECLL - but only 3 leds */
1978                         /* map 0,1,2,3 to 0,1,2,4 */
1979                         if (vc->vc_par[0] < 4)
1980                                 setledstate(kbd_table + vc->vc_num,
1981                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1982                         return;
1983                 case 'r':
1984                         if (!vc->vc_par[0])
1985                                 vc->vc_par[0]++;
1986                         if (!vc->vc_par[1])
1987                                 vc->vc_par[1] = vc->vc_rows;
1988                         /* Minimum allowed region is 2 lines */
1989                         if (vc->vc_par[0] < vc->vc_par[1] &&
1990                             vc->vc_par[1] <= vc->vc_rows) {
1991                                 vc->vc_top = vc->vc_par[0] - 1;
1992                                 vc->vc_bottom = vc->vc_par[1];
1993                                 gotoxay(vc, 0, 0);
1994                         }
1995                         return;
1996                 case 's':
1997                         save_cur(vc);
1998                         return;
1999                 case 'u':
2000                         restore_cur(vc);
2001                         return;
2002                 case 'X':
2003                         csi_X(vc, vc->vc_par[0]);
2004                         return;
2005                 case '@':
2006                         csi_at(vc, vc->vc_par[0]);
2007                         return;
2008                 case ']': /* setterm functions */
2009                         setterm_command(vc);
2010                         return;
2011                 }
2012                 return;
2013         case ESpercent:
2014                 vc->vc_state = ESnormal;
2015                 switch (c) {
2016                 case '@':  /* defined in ISO 2022 */
2017                         vc->vc_utf = 0;
2018                         return;
2019                 case 'G':  /* prelim official escape code */
2020                 case '8':  /* retained for compatibility */
2021                         vc->vc_utf = 1;
2022                         return;
2023                 }
2024                 return;
2025         case ESfunckey:
2026                 vc->vc_state = ESnormal;
2027                 return;
2028         case EShash:
2029                 vc->vc_state = ESnormal;
2030                 if (c == '8') {
2031                         /* DEC screen alignment test. kludge :-) */
2032                         vc->vc_video_erase_char =
2033                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2034                         csi_J(vc, 2);
2035                         vc->vc_video_erase_char =
2036                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2037                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2038                 }
2039                 return;
2040         case ESsetG0:
2041                 if (c == '0')
2042                         vc->vc_G0_charset = GRAF_MAP;
2043                 else if (c == 'B')
2044                         vc->vc_G0_charset = LAT1_MAP;
2045                 else if (c == 'U')
2046                         vc->vc_G0_charset = IBMPC_MAP;
2047                 else if (c == 'K')
2048                         vc->vc_G0_charset = USER_MAP;
2049                 if (vc->vc_charset == 0)
2050                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2051                 vc->vc_state = ESnormal;
2052                 return;
2053         case ESsetG1:
2054                 if (c == '0')
2055                         vc->vc_G1_charset = GRAF_MAP;
2056                 else if (c == 'B')
2057                         vc->vc_G1_charset = LAT1_MAP;
2058                 else if (c == 'U')
2059                         vc->vc_G1_charset = IBMPC_MAP;
2060                 else if (c == 'K')
2061                         vc->vc_G1_charset = USER_MAP;
2062                 if (vc->vc_charset == 1)
2063                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2064                 vc->vc_state = ESnormal;
2065                 return;
2066         default:
2067                 vc->vc_state = ESnormal;
2068         }
2069 }
2070
2071 /* This is a temporary buffer used to prepare a tty console write
2072  * so that we can easily avoid touching user space while holding the
2073  * console spinlock.  It is allocated in con_init and is shared by
2074  * this code and the vc_screen read/write tty calls.
2075  *
2076  * We have to allocate this statically in the kernel data section
2077  * since console_init (and thus con_init) are called before any
2078  * kernel memory allocation is available.
2079  */
2080 char con_buf[CON_BUF_SIZE];
2081 DEFINE_MUTEX(con_buf_mtx);
2082
2083 /* is_double_width() is based on the wcwidth() implementation by
2084  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2085  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2086  */
2087 struct interval {
2088         uint32_t first;
2089         uint32_t last;
2090 };
2091
2092 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2093 {
2094         int min = 0;
2095         int mid;
2096
2097         if (ucs < table[0].first || ucs > table[max].last)
2098                 return 0;
2099         while (max >= min) {
2100                 mid = (min + max) / 2;
2101                 if (ucs > table[mid].last)
2102                         min = mid + 1;
2103                 else if (ucs < table[mid].first)
2104                         max = mid - 1;
2105                 else
2106                         return 1;
2107         }
2108         return 0;
2109 }
2110
2111 static int is_double_width(uint32_t ucs)
2112 {
2113         static const struct interval double_width[] = {
2114                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2115                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2116                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2117                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2118         };
2119         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2120 }
2121
2122 /* acquires console_lock */
2123 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2124 {
2125 #ifdef VT_BUF_VRAM_ONLY
2126 #define FLUSH do { } while(0);
2127 #else
2128 #define FLUSH if (draw_x >= 0) { \
2129         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2130         draw_x = -1; \
2131         }
2132 #endif
2133
2134         int c, tc, ok, n = 0, draw_x = -1;
2135         unsigned int currcons;
2136         unsigned long draw_from = 0, draw_to = 0;
2137         struct vc_data *vc;
2138         unsigned char vc_attr;
2139         struct vt_notifier_param param;
2140         uint8_t rescan;
2141         uint8_t inverse;
2142         uint8_t width;
2143         u16 himask, charmask;
2144
2145         if (in_interrupt())
2146                 return count;
2147
2148         might_sleep();
2149
2150         console_lock();
2151         vc = tty->driver_data;
2152         if (vc == NULL) {
2153                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2154                 console_unlock();
2155                 return 0;
2156         }
2157
2158         currcons = vc->vc_num;
2159         if (!vc_cons_allocated(currcons)) {
2160             /* could this happen? */
2161                 printk_once("con_write: tty %d not allocated\n", currcons+1);
2162             console_unlock();
2163             return 0;
2164         }
2165
2166         himask = vc->vc_hi_font_mask;
2167         charmask = himask ? 0x1ff : 0xff;
2168
2169         /* undraw cursor first */
2170         if (IS_FG(vc))
2171                 hide_cursor(vc);
2172
2173         param.vc = vc;
2174
2175         while (!tty->stopped && count) {
2176                 int orig = *buf;
2177                 c = orig;
2178                 buf++;
2179                 n++;
2180                 count--;
2181                 rescan = 0;
2182                 inverse = 0;
2183                 width = 1;
2184
2185                 /* Do no translation at all in control states */
2186                 if (vc->vc_state != ESnormal) {
2187                         tc = c;
2188                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2189                     /* Combine UTF-8 into Unicode in vc_utf_char.
2190                      * vc_utf_count is the number of continuation bytes still
2191                      * expected to arrive.
2192                      * vc_npar is the number of continuation bytes arrived so
2193                      * far
2194                      */
2195 rescan_last_byte:
2196                     if ((c & 0xc0) == 0x80) {
2197                         /* Continuation byte received */
2198                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2199                         if (vc->vc_utf_count) {
2200                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2201                             vc->vc_npar++;
2202                             if (--vc->vc_utf_count) {
2203                                 /* Still need some bytes */
2204                                 continue;
2205                             }
2206                             /* Got a whole character */
2207                             c = vc->vc_utf_char;
2208                             /* Reject overlong sequences */
2209                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2210                                         c > utf8_length_changes[vc->vc_npar])
2211                                 c = 0xfffd;
2212                         } else {
2213                             /* Unexpected continuation byte */
2214                             vc->vc_utf_count = 0;
2215                             c = 0xfffd;
2216                         }
2217                     } else {
2218                         /* Single ASCII byte or first byte of a sequence received */
2219                         if (vc->vc_utf_count) {
2220                             /* Continuation byte expected */
2221                             rescan = 1;
2222                             vc->vc_utf_count = 0;
2223                             c = 0xfffd;
2224                         } else if (c > 0x7f) {
2225                             /* First byte of a multibyte sequence received */
2226                             vc->vc_npar = 0;
2227                             if ((c & 0xe0) == 0xc0) {
2228                                 vc->vc_utf_count = 1;
2229                                 vc->vc_utf_char = (c & 0x1f);
2230                             } else if ((c & 0xf0) == 0xe0) {
2231                                 vc->vc_utf_count = 2;
2232                                 vc->vc_utf_char = (c & 0x0f);
2233                             } else if ((c & 0xf8) == 0xf0) {
2234                                 vc->vc_utf_count = 3;
2235                                 vc->vc_utf_char = (c & 0x07);
2236                             } else if ((c & 0xfc) == 0xf8) {
2237                                 vc->vc_utf_count = 4;
2238                                 vc->vc_utf_char = (c & 0x03);
2239                             } else if ((c & 0xfe) == 0xfc) {
2240                                 vc->vc_utf_count = 5;
2241                                 vc->vc_utf_char = (c & 0x01);
2242                             } else {
2243                                 /* 254 and 255 are invalid */
2244                                 c = 0xfffd;
2245                             }
2246                             if (vc->vc_utf_count) {
2247                                 /* Still need some bytes */
2248                                 continue;
2249                             }
2250                         }
2251                         /* Nothing to do if an ASCII byte was received */
2252                     }
2253                     /* End of UTF-8 decoding. */
2254                     /* c is the received character, or U+FFFD for invalid sequences. */
2255                     /* Replace invalid Unicode code points with U+FFFD too */
2256                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2257                         c = 0xfffd;
2258                     tc = c;
2259                 } else {        /* no utf or alternate charset mode */
2260                     tc = vc_translate(vc, c);
2261                 }
2262
2263                 param.c = tc;
2264                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2265                                         &param) == NOTIFY_STOP)
2266                         continue;
2267
2268                 /* If the original code was a control character we
2269                  * only allow a glyph to be displayed if the code is
2270                  * not normally used (such as for cursor movement) or
2271                  * if the disp_ctrl mode has been explicitly enabled.
2272                  * Certain characters (as given by the CTRL_ALWAYS
2273                  * bitmap) are always displayed as control characters,
2274                  * as the console would be pretty useless without
2275                  * them; to display an arbitrary font position use the
2276                  * direct-to-font zone in UTF-8 mode.
2277                  */
2278                 ok = tc && (c >= 32 ||
2279                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2280                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2281                         && (c != 127 || vc->vc_disp_ctrl)
2282                         && (c != 128+27);
2283
2284                 if (vc->vc_state == ESnormal && ok) {
2285                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2286                                 if (is_double_width(c))
2287                                         width = 2;
2288                         }
2289                         /* Now try to find out how to display it */
2290                         tc = conv_uni_to_pc(vc, tc);
2291                         if (tc & ~charmask) {
2292                                 if (tc == -1 || tc == -2) {
2293                                     continue; /* nothing to display */
2294                                 }
2295                                 /* Glyph not found */
2296                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2297                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2298                                        This would make absolutely no sense with Unicode in mind,
2299                                        but do this for ASCII characters since a font may lack
2300                                        Unicode mapping info and we don't want to end up with
2301                                        having question marks only. */
2302                                     tc = c;
2303                                 } else {
2304                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2305                                     tc = conv_uni_to_pc(vc, 0xfffd);
2306                                     if (tc < 0) {
2307                                         inverse = 1;
2308                                         tc = conv_uni_to_pc(vc, '?');
2309                                         if (tc < 0) tc = '?';
2310                                     }
2311                                 }
2312                         }
2313
2314                         if (!inverse) {
2315                                 vc_attr = vc->vc_attr;
2316                         } else {
2317                                 /* invert vc_attr */
2318                                 if (!vc->vc_can_do_color) {
2319                                         vc_attr = (vc->vc_attr) ^ 0x08;
2320                                 } else if (vc->vc_hi_font_mask == 0x100) {
2321                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2322                                 } else {
2323                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2324                                 }
2325                                 FLUSH
2326                         }
2327
2328                         while (1) {
2329                                 if (vc->vc_need_wrap || vc->vc_decim)
2330                                         FLUSH
2331                                 if (vc->vc_need_wrap) {
2332                                         cr(vc);
2333                                         lf(vc);
2334                                 }
2335                                 if (vc->vc_decim)
2336                                         insert_char(vc, 1);
2337                                 scr_writew(himask ?
2338                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2339                                              (vc_attr << 8) + tc,
2340                                            (u16 *) vc->vc_pos);
2341                                 if (DO_UPDATE(vc) && draw_x < 0) {
2342                                         draw_x = vc->vc_x;
2343                                         draw_from = vc->vc_pos;
2344                                 }
2345                                 if (vc->vc_x == vc->vc_cols - 1) {
2346                                         vc->vc_need_wrap = vc->vc_decawm;
2347                                         draw_to = vc->vc_pos + 2;
2348                                 } else {
2349                                         vc->vc_x++;
2350                                         draw_to = (vc->vc_pos += 2);
2351                                 }
2352
2353                                 if (!--width) break;
2354
2355                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2356                                 if (tc < 0) tc = ' ';
2357                         }
2358                         notify_write(vc, c);
2359
2360                         if (inverse) {
2361                                 FLUSH
2362                         }
2363
2364                         if (rescan) {
2365                                 rescan = 0;
2366                                 inverse = 0;
2367                                 width = 1;
2368                                 c = orig;
2369                                 goto rescan_last_byte;
2370                         }
2371                         continue;
2372                 }
2373                 FLUSH
2374                 do_con_trol(tty, vc, orig);
2375         }
2376         FLUSH
2377         console_conditional_schedule();
2378         console_unlock();
2379         notify_update(vc);
2380         return n;
2381 #undef FLUSH
2382 }
2383
2384 /*
2385  * This is the console switching callback.
2386  *
2387  * Doing console switching in a process context allows
2388  * us to do the switches asynchronously (needed when we want
2389  * to switch due to a keyboard interrupt).  Synchronization
2390  * with other console code and prevention of re-entrancy is
2391  * ensured with console_lock.
2392  */
2393 static void console_callback(struct work_struct *ignored)
2394 {
2395         console_lock();
2396
2397         if (want_console >= 0) {
2398                 if (want_console != fg_console &&
2399                     vc_cons_allocated(want_console)) {
2400                         hide_cursor(vc_cons[fg_console].d);
2401                         change_console(vc_cons[want_console].d);
2402                         /* we only changed when the console had already
2403                            been allocated - a new console is not created
2404                            in an interrupt routine */
2405                 }
2406                 want_console = -1;
2407         }
2408         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2409                 do_poke_blanked_console = 0;
2410                 poke_blanked_console();
2411         }
2412         if (scrollback_delta) {
2413                 struct vc_data *vc = vc_cons[fg_console].d;
2414                 clear_selection();
2415                 if (vc->vc_mode == KD_TEXT)
2416                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2417                 scrollback_delta = 0;
2418         }
2419         if (blank_timer_expired) {
2420                 do_blank_screen(0);
2421                 blank_timer_expired = 0;
2422         }
2423         notify_update(vc_cons[fg_console].d);
2424
2425         console_unlock();
2426 }
2427
2428 int set_console(int nr)
2429 {
2430         struct vc_data *vc = vc_cons[fg_console].d;
2431
2432         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2433                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2434
2435                 /*
2436                  * Console switch will fail in console_callback() or
2437                  * change_console() so there is no point scheduling
2438                  * the callback
2439                  *
2440                  * Existing set_console() users don't check the return
2441                  * value so this shouldn't break anything
2442                  */
2443                 return -EINVAL;
2444         }
2445
2446         want_console = nr;
2447         schedule_console_callback();
2448
2449         return 0;
2450 }
2451
2452 struct tty_driver *console_driver;
2453
2454 #ifdef CONFIG_VT_CONSOLE
2455
2456 /**
2457  * vt_kmsg_redirect() - Sets/gets the kernel message console
2458  * @new:        The new virtual terminal number or -1 if the console should stay
2459  *              unchanged
2460  *
2461  * By default, the kernel messages are always printed on the current virtual
2462  * console. However, the user may modify that default with the
2463  * TIOCL_SETKMSGREDIRECT ioctl call.
2464  *
2465  * This function sets the kernel message console to be @new. It returns the old
2466  * virtual console number. The virtual terminal number 0 (both as parameter and
2467  * return value) means no redirection (i.e. always printed on the currently
2468  * active console).
2469  *
2470  * The parameter -1 means that only the current console is returned, but the
2471  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2472  * case to make the code more understandable.
2473  *
2474  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2475  * the parameter and always returns 0.
2476  */
2477 int vt_kmsg_redirect(int new)
2478 {
2479         static int kmsg_con;
2480
2481         if (new != -1)
2482                 return xchg(&kmsg_con, new);
2483         else
2484                 return kmsg_con;
2485 }
2486
2487 /*
2488  *      Console on virtual terminal
2489  *
2490  * The console must be locked when we get here.
2491  */
2492
2493 static void vt_console_print(struct console *co, const char *b, unsigned count)
2494 {
2495         struct vc_data *vc = vc_cons[fg_console].d;
2496         unsigned char c;
2497         static DEFINE_SPINLOCK(printing_lock);
2498         const ushort *start;
2499         ushort cnt = 0;
2500         ushort myx;
2501         int kmsg_console;
2502
2503         /* console busy or not yet initialized */
2504         if (!printable)
2505                 return;
2506         if (!spin_trylock(&printing_lock))
2507                 return;
2508
2509         kmsg_console = vt_get_kmsg_redirect();
2510         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2511                 vc = vc_cons[kmsg_console - 1].d;
2512
2513         /* read `x' only after setting currcons properly (otherwise
2514            the `x' macro will read the x of the foreground console). */
2515         myx = vc->vc_x;
2516
2517         if (!vc_cons_allocated(fg_console)) {
2518                 /* impossible */
2519                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2520                 goto quit;
2521         }
2522
2523         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2524                 goto quit;
2525
2526         /* undraw cursor first */
2527         if (IS_FG(vc))
2528                 hide_cursor(vc);
2529
2530         start = (ushort *)vc->vc_pos;
2531
2532         /* Contrived structure to try to emulate original need_wrap behaviour
2533          * Problems caused when we have need_wrap set on '\n' character */
2534         while (count--) {
2535                 c = *b++;
2536                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2537                         if (cnt > 0) {
2538                                 if (CON_IS_VISIBLE(vc))
2539                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2540                                 vc->vc_x += cnt;
2541                                 if (vc->vc_need_wrap)
2542                                         vc->vc_x--;
2543                                 cnt = 0;
2544                         }
2545                         if (c == 8) {           /* backspace */
2546                                 bs(vc);
2547                                 start = (ushort *)vc->vc_pos;
2548                                 myx = vc->vc_x;
2549                                 continue;
2550                         }
2551                         if (c != 13)
2552                                 lf(vc);
2553                         cr(vc);
2554                         start = (ushort *)vc->vc_pos;
2555                         myx = vc->vc_x;
2556                         if (c == 10 || c == 13)
2557                                 continue;
2558                 }
2559                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2560                 notify_write(vc, c);
2561                 cnt++;
2562                 if (myx == vc->vc_cols - 1) {
2563                         vc->vc_need_wrap = 1;
2564                         continue;
2565                 }
2566                 vc->vc_pos += 2;
2567                 myx++;
2568         }
2569         if (cnt > 0) {
2570                 if (CON_IS_VISIBLE(vc))
2571                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2572                 vc->vc_x += cnt;
2573                 if (vc->vc_x == vc->vc_cols) {
2574                         vc->vc_x--;
2575                         vc->vc_need_wrap = 1;
2576                 }
2577         }
2578         set_cursor(vc);
2579         notify_update(vc);
2580
2581 quit:
2582         spin_unlock(&printing_lock);
2583 }
2584
2585 static struct tty_driver *vt_console_device(struct console *c, int *index)
2586 {
2587         *index = c->index ? c->index-1 : fg_console;
2588         return console_driver;
2589 }
2590
2591 static struct console vt_console_driver = {
2592         .name           = "tty",
2593         .write          = vt_console_print,
2594         .device         = vt_console_device,
2595         .unblank        = unblank_screen,
2596         .flags          = CON_PRINTBUFFER,
2597         .index          = -1,
2598 };
2599 #endif
2600
2601 /*
2602  *      Handling of Linux-specific VC ioctls
2603  */
2604
2605 /*
2606  * Generally a bit racy with respect to console_lock();.
2607  *
2608  * There are some functions which don't need it.
2609  *
2610  * There are some functions which can sleep for arbitrary periods
2611  * (paste_selection) but we don't need the lock there anyway.
2612  *
2613  * set_selection has locking, and definitely needs it
2614  */
2615
2616 int tioclinux(struct tty_struct *tty, unsigned long arg)
2617 {
2618         char type, data;
2619         char __user *p = (char __user *)arg;
2620         int lines;
2621         int ret;
2622
2623         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2624                 return -EPERM;
2625         if (get_user(type, p))
2626                 return -EFAULT;
2627         ret = 0;
2628
2629         switch (type)
2630         {
2631                 case TIOCL_SETSEL:
2632                         console_lock();
2633                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2634                         console_unlock();
2635                         break;
2636                 case TIOCL_PASTESEL:
2637                         ret = paste_selection(tty);
2638                         break;
2639                 case TIOCL_UNBLANKSCREEN:
2640                         console_lock();
2641                         unblank_screen();
2642                         console_unlock();
2643                         break;
2644                 case TIOCL_SELLOADLUT:
2645                         ret = sel_loadlut(p);
2646                         break;
2647                 case TIOCL_GETSHIFTSTATE:
2648
2649         /*
2650          * Make it possible to react to Shift+Mousebutton.
2651          * Note that 'shift_state' is an undocumented
2652          * kernel-internal variable; programs not closely
2653          * related to the kernel should not use this.
2654          */
2655                         data = shift_state;
2656                         ret = __put_user(data, p);
2657                         break;
2658                 case TIOCL_GETMOUSEREPORTING:
2659                         data = mouse_reporting();
2660                         ret = __put_user(data, p);
2661                         break;
2662                 case TIOCL_SETVESABLANK:
2663                         ret = set_vesa_blanking(p);
2664                         break;
2665                 case TIOCL_GETKMSGREDIRECT:
2666                         data = vt_get_kmsg_redirect();
2667                         ret = __put_user(data, p);
2668                         break;
2669                 case TIOCL_SETKMSGREDIRECT:
2670                         if (!capable(CAP_SYS_ADMIN)) {
2671                                 ret = -EPERM;
2672                         } else {
2673                                 if (get_user(data, p+1))
2674                                         ret = -EFAULT;
2675                                 else
2676                                         vt_kmsg_redirect(data);
2677                         }
2678                         break;
2679                 case TIOCL_GETFGCONSOLE:
2680                         ret = fg_console;
2681                         break;
2682                 case TIOCL_SCROLLCONSOLE:
2683                         if (get_user(lines, (s32 __user *)(p+4))) {
2684                                 ret = -EFAULT;
2685                         } else {
2686                                 scrollfront(vc_cons[fg_console].d, lines);
2687                                 ret = 0;
2688                         }
2689                         break;
2690                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2691                         console_lock();
2692                         ignore_poke = 1;
2693                         do_blank_screen(0);
2694                         console_unlock();
2695                         break;
2696                 case TIOCL_BLANKEDSCREEN:
2697                         ret = console_blanked;
2698                         break;
2699                 default:
2700                         ret = -EINVAL;
2701                         break;
2702         }
2703         return ret;
2704 }
2705
2706 /*
2707  * /dev/ttyN handling
2708  */
2709
2710 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2711 {
2712         int     retval;
2713
2714         retval = do_con_write(tty, buf, count);
2715         con_flush_chars(tty);
2716
2717         return retval;
2718 }
2719
2720 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2721 {
2722         if (in_interrupt())
2723                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2724         return do_con_write(tty, &ch, 1);
2725 }
2726
2727 static int con_write_room(struct tty_struct *tty)
2728 {
2729         if (tty->stopped)
2730                 return 0;
2731         return 32768;           /* No limit, really; we're not buffering */
2732 }
2733
2734 static int con_chars_in_buffer(struct tty_struct *tty)
2735 {
2736         return 0;               /* we're not buffering */
2737 }
2738
2739 /*
2740  * con_throttle and con_unthrottle are only used for
2741  * paste_selection(), which has to stuff in a large number of
2742  * characters...
2743  */
2744 static void con_throttle(struct tty_struct *tty)
2745 {
2746 }
2747
2748 static void con_unthrottle(struct tty_struct *tty)
2749 {
2750         struct vc_data *vc = tty->driver_data;
2751
2752         wake_up_interruptible(&vc->paste_wait);
2753 }
2754
2755 /*
2756  * Turn the Scroll-Lock LED on when the tty is stopped
2757  */
2758 static void con_stop(struct tty_struct *tty)
2759 {
2760         int console_num;
2761         if (!tty)
2762                 return;
2763         console_num = tty->index;
2764         if (!vc_cons_allocated(console_num))
2765                 return;
2766         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2767         set_leds();
2768 }
2769
2770 /*
2771  * Turn the Scroll-Lock LED off when the console is started
2772  */
2773 static void con_start(struct tty_struct *tty)
2774 {
2775         int console_num;
2776         if (!tty)
2777                 return;
2778         console_num = tty->index;
2779         if (!vc_cons_allocated(console_num))
2780                 return;
2781         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2782         set_leds();
2783 }
2784
2785 static void con_flush_chars(struct tty_struct *tty)
2786 {
2787         struct vc_data *vc;
2788
2789         if (in_interrupt())     /* from flush_to_ldisc */
2790                 return;
2791
2792         /* if we race with con_close(), vt may be null */
2793         console_lock();
2794         vc = tty->driver_data;
2795         if (vc)
2796                 set_cursor(vc);
2797         console_unlock();
2798 }
2799
2800 /*
2801  * Allocate the console screen memory.
2802  */
2803 static int con_open(struct tty_struct *tty, struct file *filp)
2804 {
2805         unsigned int currcons = tty->index;
2806         int ret = 0;
2807
2808         console_lock();
2809         if (tty->driver_data == NULL) {
2810                 ret = vc_allocate(currcons);
2811                 if (ret == 0) {
2812                         struct vc_data *vc = vc_cons[currcons].d;
2813
2814                         /* Still being freed */
2815                         if (vc->port.tty) {
2816                                 console_unlock();
2817                                 return -ERESTARTSYS;
2818                         }
2819                         tty->driver_data = vc;
2820                         vc->port.tty = tty;
2821
2822                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2823                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2824                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2825                         }
2826                         if (vc->vc_utf)
2827                                 tty->termios->c_iflag |= IUTF8;
2828                         else
2829                                 tty->termios->c_iflag &= ~IUTF8;
2830                         console_unlock();
2831                         return ret;
2832                 }
2833         }
2834         console_unlock();
2835         return ret;
2836 }
2837
2838 static void con_close(struct tty_struct *tty, struct file *filp)
2839 {
2840         /* Nothing to do - we defer to shutdown */
2841 }
2842
2843 static void con_shutdown(struct tty_struct *tty)
2844 {
2845         struct vc_data *vc = tty->driver_data;
2846         BUG_ON(vc == NULL);
2847         console_lock();
2848         vc->port.tty = NULL;
2849         console_unlock();
2850         tty_shutdown(tty);
2851 }
2852
2853 static int default_italic_color    = 2; // green (ASCII)
2854 static int default_underline_color = 3; // cyan (ASCII)
2855 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2856 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2857
2858 static void vc_init(struct vc_data *vc, unsigned int rows,
2859                     unsigned int cols, int do_clear)
2860 {
2861         int j, k ;
2862
2863         vc->vc_cols = cols;
2864         vc->vc_rows = rows;
2865         vc->vc_size_row = cols << 1;
2866         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2867
2868         set_origin(vc);
2869         vc->vc_pos = vc->vc_origin;
2870         reset_vc(vc);
2871         for (j=k=0; j<16; j++) {
2872                 vc->vc_palette[k++] = default_red[j] ;
2873                 vc->vc_palette[k++] = default_grn[j] ;
2874                 vc->vc_palette[k++] = default_blu[j] ;
2875         }
2876         vc->vc_def_color       = 0x07;   /* white */
2877         vc->vc_ulcolor         = default_underline_color;
2878         vc->vc_itcolor         = default_italic_color;
2879         vc->vc_halfcolor       = 0x08;   /* grey */
2880         init_waitqueue_head(&vc->paste_wait);
2881         reset_terminal(vc, do_clear);
2882 }
2883
2884 /*
2885  * This routine initializes console interrupts, and does nothing
2886  * else. If you want the screen to clear, call tty_write with
2887  * the appropriate escape-sequence.
2888  */
2889
2890 static int __init con_init(void)
2891 {
2892         const char *display_desc = NULL;
2893         struct vc_data *vc;
2894         unsigned int currcons = 0, i;
2895
2896         console_lock();
2897
2898         if (conswitchp)
2899                 display_desc = conswitchp->con_startup();
2900         if (!display_desc) {
2901                 fg_console = 0;
2902                 console_unlock();
2903                 return 0;
2904         }
2905
2906         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2907                 struct con_driver *con_driver = &registered_con_driver[i];
2908
2909                 if (con_driver->con == NULL) {
2910                         con_driver->con = conswitchp;
2911                         con_driver->desc = display_desc;
2912                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2913                         con_driver->first = 0;
2914                         con_driver->last = MAX_NR_CONSOLES - 1;
2915                         break;
2916                 }
2917         }
2918
2919         for (i = 0; i < MAX_NR_CONSOLES; i++)
2920                 con_driver_map[i] = conswitchp;
2921
2922         if (blankinterval) {
2923                 blank_state = blank_normal_wait;
2924                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2925         }
2926
2927         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2928                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2929                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2930                 tty_port_init(&vc->port);
2931                 visual_init(vc, currcons, 1);
2932                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2933                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2934                         currcons || !vc->vc_sw->con_save_screen);
2935         }
2936         currcons = fg_console = 0;
2937         master_display_fg = vc = vc_cons[currcons].d;
2938         set_origin(vc);
2939         save_screen(vc);
2940         gotoxy(vc, vc->vc_x, vc->vc_y);
2941         csi_J(vc, 0);
2942         update_screen(vc);
2943         printk("Console: %s %s %dx%d",
2944                 vc->vc_can_do_color ? "colour" : "mono",
2945                 display_desc, vc->vc_cols, vc->vc_rows);
2946         printable = 1;
2947         printk("\n");
2948
2949         console_unlock();
2950
2951 #ifdef CONFIG_VT_CONSOLE
2952         register_console(&vt_console_driver);
2953 #endif
2954         return 0;
2955 }
2956 console_initcall(con_init);
2957
2958 static const struct tty_operations con_ops = {
2959         .open = con_open,
2960         .close = con_close,
2961         .write = con_write,
2962         .write_room = con_write_room,
2963         .put_char = con_put_char,
2964         .flush_chars = con_flush_chars,
2965         .chars_in_buffer = con_chars_in_buffer,
2966         .ioctl = vt_ioctl,
2967 #ifdef CONFIG_COMPAT
2968         .compat_ioctl = vt_compat_ioctl,
2969 #endif
2970         .stop = con_stop,
2971         .start = con_start,
2972         .throttle = con_throttle,
2973         .unthrottle = con_unthrottle,
2974         .resize = vt_resize,
2975         .shutdown = con_shutdown
2976 };
2977
2978 static struct cdev vc0_cdev;
2979
2980 static ssize_t show_tty_active(struct device *dev,
2981                                 struct device_attribute *attr, char *buf)
2982 {
2983         return sprintf(buf, "tty%d\n", fg_console + 1);
2984 }
2985 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2986
2987 int __init vty_init(const struct file_operations *console_fops)
2988 {
2989         cdev_init(&vc0_cdev, console_fops);
2990         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2991             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2992                 panic("Couldn't register /dev/tty0 driver\n");
2993         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2994         if (IS_ERR(tty0dev))
2995                 tty0dev = NULL;
2996         else
2997                 device_create_file(tty0dev, &dev_attr_active);
2998
2999         vcs_init();
3000
3001         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3002         if (!console_driver)
3003                 panic("Couldn't allocate console driver\n");
3004         console_driver->owner = THIS_MODULE;
3005         console_driver->name = "tty";
3006         console_driver->name_base = 1;
3007         console_driver->major = TTY_MAJOR;
3008         console_driver->minor_start = 1;
3009         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3010         console_driver->init_termios = tty_std_termios;
3011         if (default_utf8)
3012                 console_driver->init_termios.c_iflag |= IUTF8;
3013         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3014         tty_set_operations(console_driver, &con_ops);
3015         if (tty_register_driver(console_driver))
3016                 panic("Couldn't register console driver\n");
3017         kbd_init();
3018         console_map_init();
3019 #ifdef CONFIG_MDA_CONSOLE
3020         mda_console_init();
3021 #endif
3022         return 0;
3023 }
3024
3025 #ifndef VT_SINGLE_DRIVER
3026
3027 static struct class *vtconsole_class;
3028
3029 static int bind_con_driver(const struct consw *csw, int first, int last,
3030                            int deflt)
3031 {
3032         struct module *owner = csw->owner;
3033         const char *desc = NULL;
3034         struct con_driver *con_driver;
3035         int i, j = -1, k = -1, retval = -ENODEV;
3036
3037         if (!try_module_get(owner))
3038                 return -ENODEV;
3039
3040         console_lock();
3041
3042         /* check if driver is registered */
3043         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3044                 con_driver = &registered_con_driver[i];
3045
3046                 if (con_driver->con == csw) {
3047                         desc = con_driver->desc;
3048                         retval = 0;
3049                         break;
3050                 }
3051         }
3052
3053         if (retval)
3054                 goto err;
3055
3056         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3057                 csw->con_startup();
3058                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3059         }
3060
3061         if (deflt) {
3062                 if (conswitchp)
3063                         module_put(conswitchp->owner);
3064
3065                 __module_get(owner);
3066                 conswitchp = csw;
3067         }
3068
3069         first = max(first, con_driver->first);
3070         last = min(last, con_driver->last);
3071
3072         for (i = first; i <= last; i++) {
3073                 int old_was_color;
3074                 struct vc_data *vc = vc_cons[i].d;
3075
3076                 if (con_driver_map[i])
3077                         module_put(con_driver_map[i]->owner);
3078                 __module_get(owner);
3079                 con_driver_map[i] = csw;
3080
3081                 if (!vc || !vc->vc_sw)
3082                         continue;
3083
3084                 j = i;
3085
3086                 if (CON_IS_VISIBLE(vc)) {
3087                         k = i;
3088                         save_screen(vc);
3089                 }
3090
3091                 old_was_color = vc->vc_can_do_color;
3092                 vc->vc_sw->con_deinit(vc);
3093                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3094                 visual_init(vc, i, 0);
3095                 set_origin(vc);
3096                 update_attr(vc);
3097
3098                 /* If the console changed between mono <-> color, then
3099                  * the attributes in the screenbuf will be wrong.  The
3100                  * following resets all attributes to something sane.
3101                  */
3102                 if (old_was_color != vc->vc_can_do_color)
3103                         clear_buffer_attributes(vc);
3104         }
3105
3106         printk("Console: switching ");
3107         if (!deflt)
3108                 printk("consoles %d-%d ", first+1, last+1);
3109         if (j >= 0) {
3110                 struct vc_data *vc = vc_cons[j].d;
3111
3112                 printk("to %s %s %dx%d\n",
3113                        vc->vc_can_do_color ? "colour" : "mono",
3114                        desc, vc->vc_cols, vc->vc_rows);
3115
3116                 if (k >= 0) {
3117                         vc = vc_cons[k].d;
3118                         update_screen(vc);
3119                 }
3120         } else
3121                 printk("to %s\n", desc);
3122
3123         retval = 0;
3124 err:
3125         console_unlock();
3126         module_put(owner);
3127         return retval;
3128 };
3129
3130 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3131 static int con_is_graphics(const struct consw *csw, int first, int last)
3132 {
3133         int i, retval = 0;
3134
3135         for (i = first; i <= last; i++) {
3136                 struct vc_data *vc = vc_cons[i].d;
3137
3138                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3139                         retval = 1;
3140                         break;
3141                 }
3142         }
3143
3144         return retval;
3145 }
3146
3147 /**
3148  * unbind_con_driver - unbind a console driver
3149  * @csw: pointer to console driver to unregister
3150  * @first: first in range of consoles that @csw should be unbound from
3151  * @last: last in range of consoles that @csw should be unbound from
3152  * @deflt: should next bound console driver be default after @csw is unbound?
3153  *
3154  * To unbind a driver from all possible consoles, pass 0 as @first and
3155  * %MAX_NR_CONSOLES as @last.
3156  *
3157  * @deflt controls whether the console that ends up replacing @csw should be
3158  * the default console.
3159  *
3160  * RETURNS:
3161  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3162  * or 0 on success.
3163  */
3164 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3165 {
3166         struct module *owner = csw->owner;
3167         const struct consw *defcsw = NULL;
3168         struct con_driver *con_driver = NULL, *con_back = NULL;
3169         int i, retval = -ENODEV;
3170
3171         if (!try_module_get(owner))
3172                 return -ENODEV;
3173
3174         console_lock();
3175
3176         /* check if driver is registered and if it is unbindable */
3177         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3178                 con_driver = &registered_con_driver[i];
3179
3180                 if (con_driver->con == csw &&
3181                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3182                         retval = 0;
3183                         break;
3184                 }
3185         }
3186
3187         if (retval) {
3188                 console_unlock();
3189                 goto err;
3190         }
3191
3192         retval = -ENODEV;
3193
3194         /* check if backup driver exists */
3195         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3196                 con_back = &registered_con_driver[i];
3197
3198                 if (con_back->con &&
3199                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3200                         defcsw = con_back->con;
3201                         retval = 0;
3202                         break;
3203                 }
3204         }
3205
3206         if (retval) {
3207                 console_unlock();
3208                 goto err;
3209         }
3210
3211         if (!con_is_bound(csw)) {
3212                 console_unlock();
3213                 goto err;
3214         }
3215
3216         first = max(first, con_driver->first);
3217         last = min(last, con_driver->last);
3218
3219         for (i = first; i <= last; i++) {
3220                 if (con_driver_map[i] == csw) {
3221                         module_put(csw->owner);
3222                         con_driver_map[i] = NULL;
3223                 }
3224         }
3225
3226         if (!con_is_bound(defcsw)) {
3227                 const struct consw *defconsw = conswitchp;
3228
3229                 defcsw->con_startup();
3230                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3231                 /*
3232                  * vgacon may change the default driver to point
3233                  * to dummycon, we restore it here...
3234                  */
3235                 conswitchp = defconsw;
3236         }
3237
3238         if (!con_is_bound(csw))
3239                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3240
3241         console_unlock();
3242         /* ignore return value, binding should not fail */
3243         bind_con_driver(defcsw, first, last, deflt);
3244 err:
3245         module_put(owner);
3246         return retval;
3247
3248 }
3249 EXPORT_SYMBOL(unbind_con_driver);
3250
3251 static int vt_bind(struct con_driver *con)
3252 {
3253         const struct consw *defcsw = NULL, *csw = NULL;
3254         int i, more = 1, first = -1, last = -1, deflt = 0;
3255
3256         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3257             con_is_graphics(con->con, con->first, con->last))
3258                 goto err;
3259
3260         csw = con->con;
3261
3262         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3263                 struct con_driver *con = &registered_con_driver[i];
3264
3265                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3266                         defcsw = con->con;
3267                         break;
3268                 }
3269         }
3270
3271         if (!defcsw)
3272                 goto err;
3273
3274         while (more) {
3275                 more = 0;
3276
3277                 for (i = con->first; i <= con->last; i++) {
3278                         if (con_driver_map[i] == defcsw) {
3279                                 if (first == -1)
3280                                         first = i;
3281                                 last = i;
3282                                 more = 1;
3283                         } else if (first != -1)
3284                                 break;
3285                 }
3286
3287                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3288                         deflt = 1;
3289
3290                 if (first != -1)
3291                         bind_con_driver(csw, first, last, deflt);
3292
3293                 first = -1;
3294                 last = -1;
3295                 deflt = 0;
3296         }
3297
3298 err:
3299         return 0;
3300 }
3301
3302 static int vt_unbind(struct con_driver *con)
3303 {
3304         const struct consw *csw = NULL;
3305         int i, more = 1, first = -1, last = -1, deflt = 0;
3306
3307         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3308             con_is_graphics(con->con, con->first, con->last))
3309                 goto err;
3310
3311         csw = con->con;
3312
3313         while (more) {
3314                 more = 0;
3315
3316                 for (i = con->first; i <= con->last; i++) {
3317                         if (con_driver_map[i] == csw) {
3318                                 if (first == -1)
3319                                         first = i;
3320                                 last = i;
3321                                 more = 1;
3322                         } else if (first != -1)
3323                                 break;
3324                 }
3325
3326                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3327                         deflt = 1;
3328
3329                 if (first != -1)
3330                         unbind_con_driver(csw, first, last, deflt);
3331
3332                 first = -1;
3333                 last = -1;
3334                 deflt = 0;
3335         }
3336
3337 err:
3338         return 0;
3339 }
3340 #else
3341 static inline int vt_bind(struct con_driver *con)
3342 {
3343         return 0;
3344 }
3345 static inline int vt_unbind(struct con_driver *con)
3346 {
3347         return 0;
3348 }
3349 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3350
3351 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3352                           const char *buf, size_t count)
3353 {
3354         struct con_driver *con = dev_get_drvdata(dev);
3355         int bind = simple_strtoul(buf, NULL, 0);
3356
3357         if (bind)
3358                 vt_bind(con);
3359         else
3360                 vt_unbind(con);
3361
3362         return count;
3363 }
3364
3365 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3366                          char *buf)
3367 {
3368         struct con_driver *con = dev_get_drvdata(dev);
3369         int bind = con_is_bound(con->con);
3370
3371         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3372 }
3373
3374 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3375                          char *buf)
3376 {
3377         struct con_driver *con = dev_get_drvdata(dev);
3378
3379         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3380                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3381                          con->desc);
3382
3383 }
3384
3385 static struct device_attribute device_attrs[] = {
3386         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3387         __ATTR(name, S_IRUGO, show_name, NULL),
3388 };
3389
3390 static int vtconsole_init_device(struct con_driver *con)
3391 {
3392         int i;
3393         int error = 0;
3394
3395         con->flag |= CON_DRIVER_FLAG_ATTR;
3396         dev_set_drvdata(con->dev, con);
3397         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3398                 error = device_create_file(con->dev, &device_attrs[i]);
3399                 if (error)
3400                         break;
3401         }
3402
3403         if (error) {
3404                 while (--i >= 0)
3405                         device_remove_file(con->dev, &device_attrs[i]);
3406                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3407         }
3408
3409         return error;
3410 }
3411
3412 static void vtconsole_deinit_device(struct con_driver *con)
3413 {
3414         int i;
3415
3416         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3417                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3418                         device_remove_file(con->dev, &device_attrs[i]);
3419                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3420         }
3421 }
3422
3423 /**
3424  * con_is_bound - checks if driver is bound to the console
3425  * @csw: console driver
3426  *
3427  * RETURNS: zero if unbound, nonzero if bound
3428  *
3429  * Drivers can call this and if zero, they should release
3430  * all resources allocated on con_startup()
3431  */
3432 int con_is_bound(const struct consw *csw)
3433 {
3434         int i, bound = 0;
3435
3436         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3437                 if (con_driver_map[i] == csw) {
3438                         bound = 1;
3439                         break;
3440                 }
3441         }
3442
3443         return bound;
3444 }
3445 EXPORT_SYMBOL(con_is_bound);
3446
3447 /**
3448  * con_debug_enter - prepare the console for the kernel debugger
3449  * @sw: console driver
3450  *
3451  * Called when the console is taken over by the kernel debugger, this
3452  * function needs to save the current console state, then put the console
3453  * into a state suitable for the kernel debugger.
3454  *
3455  * RETURNS:
3456  * Zero on success, nonzero if a failure occurred when trying to prepare
3457  * the console for the debugger.
3458  */
3459 int con_debug_enter(struct vc_data *vc)
3460 {
3461         int ret = 0;
3462
3463         saved_fg_console = fg_console;
3464         saved_last_console = last_console;
3465         saved_want_console = want_console;
3466         saved_vc_mode = vc->vc_mode;
3467         saved_console_blanked = console_blanked;
3468         vc->vc_mode = KD_TEXT;
3469         console_blanked = 0;
3470         if (vc->vc_sw->con_debug_enter)
3471                 ret = vc->vc_sw->con_debug_enter(vc);
3472 #ifdef CONFIG_KGDB_KDB
3473         /* Set the initial LINES variable if it is not already set */
3474         if (vc->vc_rows < 999) {
3475                 int linecount;
3476                 char lns[4];
3477                 const char *setargs[3] = {
3478                         "set",
3479                         "LINES",
3480                         lns,
3481                 };
3482                 if (kdbgetintenv(setargs[0], &linecount)) {
3483                         snprintf(lns, 4, "%i", vc->vc_rows);
3484                         kdb_set(2, setargs);
3485                 }
3486         }
3487 #endif /* CONFIG_KGDB_KDB */
3488         return ret;
3489 }
3490 EXPORT_SYMBOL_GPL(con_debug_enter);
3491
3492 /**
3493  * con_debug_leave - restore console state
3494  * @sw: console driver
3495  *
3496  * Restore the console state to what it was before the kernel debugger
3497  * was invoked.
3498  *
3499  * RETURNS:
3500  * Zero on success, nonzero if a failure occurred when trying to restore
3501  * the console.
3502  */
3503 int con_debug_leave(void)
3504 {
3505         struct vc_data *vc;
3506         int ret = 0;
3507
3508         fg_console = saved_fg_console;
3509         last_console = saved_last_console;
3510         want_console = saved_want_console;
3511         console_blanked = saved_console_blanked;
3512         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3513
3514         vc = vc_cons[fg_console].d;
3515         if (vc->vc_sw->con_debug_leave)
3516                 ret = vc->vc_sw->con_debug_leave(vc);
3517         return ret;
3518 }
3519 EXPORT_SYMBOL_GPL(con_debug_leave);
3520
3521 /**
3522  * register_con_driver - register console driver to console layer
3523  * @csw: console driver
3524  * @first: the first console to take over, minimum value is 0
3525  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3526  *
3527  * DESCRIPTION: This function registers a console driver which can later
3528  * bind to a range of consoles specified by @first and @last. It will
3529  * also initialize the console driver by calling con_startup().
3530  */
3531 int register_con_driver(const struct consw *csw, int first, int last)
3532 {
3533         struct module *owner = csw->owner;
3534         struct con_driver *con_driver;
3535         const char *desc;
3536         int i, retval = 0;
3537
3538         if (!try_module_get(owner))
3539                 return -ENODEV;
3540
3541         console_lock();
3542
3543         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3544                 con_driver = &registered_con_driver[i];
3545
3546                 /* already registered */
3547                 if (con_driver->con == csw)
3548                         retval = -EINVAL;
3549         }
3550
3551         if (retval)
3552                 goto err;
3553
3554         desc = csw->con_startup();
3555
3556         if (!desc)
3557                 goto err;
3558
3559         retval = -EINVAL;
3560
3561         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3562                 con_driver = &registered_con_driver[i];
3563
3564                 if (con_driver->con == NULL) {
3565                         con_driver->con = csw;
3566                         con_driver->desc = desc;
3567                         con_driver->node = i;
3568                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3569                                            CON_DRIVER_FLAG_INIT;
3570                         con_driver->first = first;
3571                         con_driver->last = last;
3572                         retval = 0;
3573                         break;
3574                 }
3575         }
3576
3577         if (retval)
3578                 goto err;
3579
3580         con_driver->dev = device_create(vtconsole_class, NULL,
3581                                                 MKDEV(0, con_driver->node),
3582                                                 NULL, "vtcon%i",
3583                                                 con_driver->node);
3584
3585         if (IS_ERR(con_driver->dev)) {
3586                 printk(KERN_WARNING "Unable to create device for %s; "
3587                        "errno = %ld\n", con_driver->desc,
3588                        PTR_ERR(con_driver->dev));
3589                 con_driver->dev = NULL;
3590         } else {
3591                 vtconsole_init_device(con_driver);
3592         }
3593
3594 err:
3595         console_unlock();
3596         module_put(owner);
3597         return retval;
3598 }
3599 EXPORT_SYMBOL(register_con_driver);
3600
3601 /**
3602  * unregister_con_driver - unregister console driver from console layer
3603  * @csw: console driver
3604  *
3605  * DESCRIPTION: All drivers that registers to the console layer must
3606  * call this function upon exit, or if the console driver is in a state
3607  * where it won't be able to handle console services, such as the
3608  * framebuffer console without loaded framebuffer drivers.
3609  *
3610  * The driver must unbind first prior to unregistration.
3611  */
3612 int unregister_con_driver(const struct consw *csw)
3613 {
3614         int i, retval = -ENODEV;
3615
3616         console_lock();
3617
3618         /* cannot unregister a bound driver */
3619         if (con_is_bound(csw))
3620                 goto err;
3621
3622         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3623                 struct con_driver *con_driver = &registered_con_driver[i];
3624
3625                 if (con_driver->con == csw &&
3626                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3627                         vtconsole_deinit_device(con_driver);
3628                         device_destroy(vtconsole_class,
3629                                        MKDEV(0, con_driver->node));
3630                         con_driver->con = NULL;
3631                         con_driver->desc = NULL;
3632                         con_driver->dev = NULL;
3633                         con_driver->node = 0;
3634                         con_driver->flag = 0;
3635                         con_driver->first = 0;
3636                         con_driver->last = 0;
3637                         retval = 0;
3638                         break;
3639                 }
3640         }
3641 err:
3642         console_unlock();
3643         return retval;
3644 }
3645 EXPORT_SYMBOL(unregister_con_driver);
3646
3647 /*
3648  *      If we support more console drivers, this function is used
3649  *      when a driver wants to take over some existing consoles
3650  *      and become default driver for newly opened ones.
3651  *
3652  *      take_over_console is basically a register followed by unbind
3653  */
3654 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3655 {
3656         int err;
3657
3658         err = register_con_driver(csw, first, last);
3659
3660         if (!err)
3661                 bind_con_driver(csw, first, last, deflt);
3662
3663         return err;
3664 }
3665
3666 /*
3667  * give_up_console is a wrapper to unregister_con_driver. It will only
3668  * work if driver is fully unbound.
3669  */
3670 void give_up_console(const struct consw *csw)
3671 {
3672         unregister_con_driver(csw);
3673 }
3674
3675 static int __init vtconsole_class_init(void)
3676 {
3677         int i;
3678
3679         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3680         if (IS_ERR(vtconsole_class)) {
3681                 printk(KERN_WARNING "Unable to create vt console class; "
3682                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3683                 vtconsole_class = NULL;
3684         }
3685
3686         /* Add system drivers to sysfs */
3687         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3688                 struct con_driver *con = &registered_con_driver[i];
3689
3690                 if (con->con && !con->dev) {
3691                         con->dev = device_create(vtconsole_class, NULL,
3692                                                          MKDEV(0, con->node),
3693                                                          NULL, "vtcon%i",
3694                                                          con->node);
3695
3696                         if (IS_ERR(con->dev)) {
3697                                 printk(KERN_WARNING "Unable to create "
3698                                        "device for %s; errno = %ld\n",
3699                                        con->desc, PTR_ERR(con->dev));
3700                                 con->dev = NULL;
3701                         } else {
3702                                 vtconsole_init_device(con);
3703                         }
3704                 }
3705         }
3706
3707         return 0;
3708 }
3709 postcore_initcall(vtconsole_class_init);
3710
3711 #endif
3712
3713 /*
3714  *      Screen blanking
3715  */
3716
3717 static int set_vesa_blanking(char __user *p)
3718 {
3719         unsigned int mode;
3720
3721         if (get_user(mode, p + 1))
3722                 return -EFAULT;
3723
3724         vesa_blank_mode = (mode < 4) ? mode : 0;
3725         return 0;
3726 }
3727
3728 void do_blank_screen(int entering_gfx)
3729 {
3730         struct vc_data *vc = vc_cons[fg_console].d;
3731         int i;
3732
3733         WARN_CONSOLE_UNLOCKED();
3734
3735         if (console_blanked) {
3736                 if (blank_state == blank_vesa_wait) {
3737                         blank_state = blank_off;
3738                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3739                 }
3740                 return;
3741         }
3742
3743         /* entering graphics mode? */
3744         if (entering_gfx) {
3745                 hide_cursor(vc);
3746                 save_screen(vc);
3747                 vc->vc_sw->con_blank(vc, -1, 1);
3748                 console_blanked = fg_console + 1;
3749                 blank_state = blank_off;
3750                 set_origin(vc);
3751                 return;
3752         }
3753
3754         if (blank_state != blank_normal_wait)
3755                 return;
3756         blank_state = blank_off;
3757
3758         /* don't blank graphics */
3759         if (vc->vc_mode != KD_TEXT) {
3760                 console_blanked = fg_console + 1;
3761                 return;
3762         }
3763
3764         hide_cursor(vc);
3765         del_timer_sync(&console_timer);
3766         blank_timer_expired = 0;
3767
3768         save_screen(vc);
3769         /* In case we need to reset origin, blanking hook returns 1 */
3770         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3771         console_blanked = fg_console + 1;
3772         if (i)
3773                 set_origin(vc);
3774
3775         if (console_blank_hook && console_blank_hook(1))
3776                 return;
3777
3778         if (vesa_off_interval && vesa_blank_mode) {
3779                 blank_state = blank_vesa_wait;
3780                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3781         }
3782         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3783 }
3784 EXPORT_SYMBOL(do_blank_screen);
3785
3786 /*
3787  * Called by timer as well as from vt_console_driver
3788  */
3789 void do_unblank_screen(int leaving_gfx)
3790 {
3791         struct vc_data *vc;
3792
3793         /* This should now always be called from a "sane" (read: can schedule)
3794          * context for the sake of the low level drivers, except in the special
3795          * case of oops_in_progress
3796          */
3797         if (!oops_in_progress)
3798                 might_sleep();
3799
3800         WARN_CONSOLE_UNLOCKED();
3801
3802         ignore_poke = 0;
3803         if (!console_blanked)
3804                 return;
3805         if (!vc_cons_allocated(fg_console)) {
3806                 /* impossible */
3807                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3808                 return;
3809         }
3810         vc = vc_cons[fg_console].d;
3811         /* Try to unblank in oops case too */
3812         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3813                 return; /* but leave console_blanked != 0 */
3814
3815         if (blankinterval) {
3816                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3817                 blank_state = blank_normal_wait;
3818         }
3819
3820         console_blanked = 0;
3821         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3822                 /* Low-level driver cannot restore -> do it ourselves */
3823                 update_screen(vc);
3824         if (console_blank_hook)
3825                 console_blank_hook(0);
3826         set_palette(vc);
3827         set_cursor(vc);
3828         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3829 }
3830 EXPORT_SYMBOL(do_unblank_screen);
3831
3832 /*
3833  * This is called by the outside world to cause a forced unblank, mostly for
3834  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3835  * call it with 1 as an argument and so force a mode restore... that may kill
3836  * X or at least garbage the screen but would also make the Oops visible...
3837  */
3838 void unblank_screen(void)
3839 {
3840         do_unblank_screen(0);
3841 }
3842
3843 /*
3844  * We defer the timer blanking to work queue so it can take the console mutex
3845  * (console operations can still happen at irq time, but only from printk which
3846  * has the console mutex. Not perfect yet, but better than no locking
3847  */
3848 static void blank_screen_t(unsigned long dummy)
3849 {
3850         if (unlikely(!keventd_up())) {
3851                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3852                 return;
3853         }
3854         blank_timer_expired = 1;
3855         schedule_work(&console_work);
3856 }
3857
3858 void poke_blanked_console(void)
3859 {
3860         WARN_CONSOLE_UNLOCKED();
3861
3862         /* Add this so we quickly catch whoever might call us in a non
3863          * safe context. Nowadays, unblank_screen() isn't to be called in
3864          * atomic contexts and is allowed to schedule (with the special case
3865          * of oops_in_progress, but that isn't of any concern for this
3866          * function. --BenH.
3867          */
3868         might_sleep();
3869
3870         /* This isn't perfectly race free, but a race here would be mostly harmless,
3871          * at worse, we'll do a spurrious blank and it's unlikely
3872          */
3873         del_timer(&console_timer);
3874         blank_timer_expired = 0;
3875
3876         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3877                 return;
3878         if (console_blanked)
3879                 unblank_screen();
3880         else if (blankinterval) {
3881                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3882                 blank_state = blank_normal_wait;
3883         }
3884 }
3885
3886 /*
3887  *      Palettes
3888  */
3889
3890 static void set_palette(struct vc_data *vc)
3891 {
3892         WARN_CONSOLE_UNLOCKED();
3893
3894         if (vc->vc_mode != KD_GRAPHICS)
3895                 vc->vc_sw->con_set_palette(vc, color_table);
3896 }
3897
3898 static int set_get_cmap(unsigned char __user *arg, int set)
3899 {
3900     int i, j, k;
3901
3902     WARN_CONSOLE_UNLOCKED();
3903
3904     for (i = 0; i < 16; i++)
3905         if (set) {
3906             get_user(default_red[i], arg++);
3907             get_user(default_grn[i], arg++);
3908             get_user(default_blu[i], arg++);
3909         } else {
3910             put_user(default_red[i], arg++);
3911             put_user(default_grn[i], arg++);
3912             put_user(default_blu[i], arg++);
3913         }
3914     if (set) {
3915         for (i = 0; i < MAX_NR_CONSOLES; i++)
3916             if (vc_cons_allocated(i)) {
3917                 for (j = k = 0; j < 16; j++) {
3918                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3919                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3920                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3921                 }
3922                 set_palette(vc_cons[i].d);
3923             }
3924     }
3925     return 0;
3926 }
3927
3928 /*
3929  * Load palette into the DAC registers. arg points to a colour
3930  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3931  */
3932
3933 int con_set_cmap(unsigned char __user *arg)
3934 {
3935         int rc;
3936
3937         console_lock();
3938         rc = set_get_cmap (arg,1);
3939         console_unlock();
3940
3941         return rc;
3942 }
3943
3944 int con_get_cmap(unsigned char __user *arg)
3945 {
3946         int rc;
3947
3948         console_lock();
3949         rc = set_get_cmap (arg,0);
3950         console_unlock();
3951
3952         return rc;
3953 }
3954
3955 void reset_palette(struct vc_data *vc)
3956 {
3957         int j, k;
3958         for (j=k=0; j<16; j++) {
3959                 vc->vc_palette[k++] = default_red[j];
3960                 vc->vc_palette[k++] = default_grn[j];
3961                 vc->vc_palette[k++] = default_blu[j];
3962         }
3963         set_palette(vc);
3964 }
3965
3966 /*
3967  *  Font switching
3968  *
3969  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3970  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3971  *  depending on width) reserved for each character which is kinda wasty, but
3972  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3973  *  is upto the actual low-level console-driver convert data into its favorite
3974  *  format (maybe we should add a `fontoffset' field to the `display'
3975  *  structure so we won't have to convert the fontdata all the time.
3976  *  /Jes
3977  */
3978
3979 #define max_font_size 65536
3980
3981 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3982 {
3983         struct console_font font;
3984         int rc = -EINVAL;
3985         int c;
3986
3987         if (vc->vc_mode != KD_TEXT)
3988                 return -EINVAL;
3989
3990         if (op->data) {
3991                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3992                 if (!font.data)
3993                         return -ENOMEM;
3994         } else
3995                 font.data = NULL;
3996
3997         console_lock();
3998         if (vc->vc_sw->con_font_get)
3999                 rc = vc->vc_sw->con_font_get(vc, &font);
4000         else
4001                 rc = -ENOSYS;
4002         console_unlock();
4003
4004         if (rc)
4005                 goto out;
4006
4007         c = (font.width+7)/8 * 32 * font.charcount;
4008
4009         if (op->data && font.charcount > op->charcount)
4010                 rc = -ENOSPC;
4011         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4012                 if (font.width > op->width || font.height > op->height)
4013                         rc = -ENOSPC;
4014         } else {
4015                 if (font.width != 8)
4016                         rc = -EIO;
4017                 else if ((op->height && font.height > op->height) ||
4018                          font.height > 32)
4019                         rc = -ENOSPC;
4020         }
4021         if (rc)
4022                 goto out;
4023
4024         op->height = font.height;
4025         op->width = font.width;
4026         op->charcount = font.charcount;
4027
4028         if (op->data && copy_to_user(op->data, font.data, c))
4029                 rc = -EFAULT;
4030
4031 out:
4032         kfree(font.data);
4033         return rc;
4034 }
4035
4036 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4037 {
4038         struct console_font font;
4039         int rc = -EINVAL;
4040         int size;
4041
4042         if (vc->vc_mode != KD_TEXT)
4043                 return -EINVAL;
4044         if (!op->data)
4045                 return -EINVAL;
4046         if (op->charcount > 512)
4047                 return -EINVAL;
4048         if (!op->height) {              /* Need to guess font height [compat] */
4049                 int h, i;
4050                 u8 __user *charmap = op->data;
4051                 u8 tmp;
4052
4053                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4054                    so that we can get rid of this soon */
4055                 if (!(op->flags & KD_FONT_FLAG_OLD))
4056                         return -EINVAL;
4057                 for (h = 32; h > 0; h--)
4058                         for (i = 0; i < op->charcount; i++) {
4059                                 if (get_user(tmp, &charmap[32*i+h-1]))
4060                                         return -EFAULT;
4061                                 if (tmp)
4062                                         goto nonzero;
4063                         }
4064                 return -EINVAL;
4065         nonzero:
4066                 op->height = h;
4067         }
4068         if (op->width <= 0 || op->width > 32 || op->height > 32)
4069                 return -EINVAL;
4070         size = (op->width+7)/8 * 32 * op->charcount;
4071         if (size > max_font_size)
4072                 return -ENOSPC;
4073         font.charcount = op->charcount;
4074         font.height = op->height;
4075         font.width = op->width;
4076         font.data = memdup_user(op->data, size);
4077         if (IS_ERR(font.data))
4078                 return PTR_ERR(font.data);
4079         console_lock();
4080         if (vc->vc_sw->con_font_set)
4081                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4082         else
4083                 rc = -ENOSYS;
4084         console_unlock();
4085         kfree(font.data);
4086         return rc;
4087 }
4088
4089 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4090 {
4091         struct console_font font = {.width = op->width, .height = op->height};
4092         char name[MAX_FONT_NAME];
4093         char *s = name;
4094         int rc;
4095
4096         if (vc->vc_mode != KD_TEXT)
4097                 return -EINVAL;
4098
4099         if (!op->data)
4100                 s = NULL;
4101         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4102                 return -EFAULT;
4103         else
4104                 name[MAX_FONT_NAME - 1] = 0;
4105
4106         console_lock();
4107         if (vc->vc_sw->con_font_default)
4108                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4109         else
4110                 rc = -ENOSYS;
4111         console_unlock();
4112         if (!rc) {
4113                 op->width = font.width;
4114                 op->height = font.height;
4115         }
4116         return rc;
4117 }
4118
4119 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4120 {
4121         int con = op->height;
4122         int rc;
4123
4124         if (vc->vc_mode != KD_TEXT)
4125                 return -EINVAL;
4126
4127         console_lock();
4128         if (!vc->vc_sw->con_font_copy)
4129                 rc = -ENOSYS;
4130         else if (con < 0 || !vc_cons_allocated(con))
4131                 rc = -ENOTTY;
4132         else if (con == vc->vc_num)     /* nothing to do */
4133                 rc = 0;
4134         else
4135                 rc = vc->vc_sw->con_font_copy(vc, con);
4136         console_unlock();
4137         return rc;
4138 }
4139
4140 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4141 {
4142         switch (op->op) {
4143         case KD_FONT_OP_SET:
4144                 return con_font_set(vc, op);
4145         case KD_FONT_OP_GET:
4146                 return con_font_get(vc, op);
4147         case KD_FONT_OP_SET_DEFAULT:
4148                 return con_font_default(vc, op);
4149         case KD_FONT_OP_COPY:
4150                 return con_font_copy(vc, op);
4151         }
4152         return -ENOSYS;
4153 }
4154
4155 /*
4156  *      Interface exported to selection and vcs.
4157  */
4158
4159 /* used by selection */
4160 u16 screen_glyph(struct vc_data *vc, int offset)
4161 {
4162         u16 w = scr_readw(screenpos(vc, offset, 1));
4163         u16 c = w & 0xff;
4164
4165         if (w & vc->vc_hi_font_mask)
4166                 c |= 0x100;
4167         return c;
4168 }
4169 EXPORT_SYMBOL_GPL(screen_glyph);
4170
4171 /* used by vcs - note the word offset */
4172 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4173 {
4174         return screenpos(vc, 2 * w_offset, viewed);
4175 }
4176
4177 void getconsxy(struct vc_data *vc, unsigned char *p)
4178 {
4179         p[0] = vc->vc_x;
4180         p[1] = vc->vc_y;
4181 }
4182
4183 void putconsxy(struct vc_data *vc, unsigned char *p)
4184 {
4185         hide_cursor(vc);
4186         gotoxy(vc, p[0], p[1]);
4187         set_cursor(vc);
4188 }
4189
4190 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4191 {
4192         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4193                 return softcursor_original;
4194         return scr_readw(org);
4195 }
4196
4197 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4198 {
4199         scr_writew(val, org);
4200         if ((unsigned long)org == vc->vc_pos) {
4201                 softcursor_original = -1;
4202                 add_softcursor(vc);
4203         }
4204 }
4205
4206 void vcs_scr_updated(struct vc_data *vc)
4207 {
4208         notify_update(vc);
4209 }
4210
4211 /*
4212  *      Visible symbols for modules
4213  */
4214
4215 EXPORT_SYMBOL(color_table);
4216 EXPORT_SYMBOL(default_red);
4217 EXPORT_SYMBOL(default_grn);
4218 EXPORT_SYMBOL(default_blu);
4219 EXPORT_SYMBOL(update_region);
4220 EXPORT_SYMBOL(redraw_screen);
4221 EXPORT_SYMBOL(vc_resize);
4222 EXPORT_SYMBOL(fg_console);
4223 EXPORT_SYMBOL(console_blank_hook);
4224 EXPORT_SYMBOL(console_blanked);
4225 EXPORT_SYMBOL(vc_cons);
4226 EXPORT_SYMBOL(global_cursor_default);
4227 #ifndef VT_SINGLE_DRIVER
4228 EXPORT_SYMBOL(take_over_console);
4229 EXPORT_SYMBOL(give_up_console);
4230 #endif