drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <g-hunt@ee.utah.edu>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21  *
  22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <poe@daimi.aau.dk>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <geert@linux-m68k.org>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <arno@usn.nl>
  39  *     - David Carter <carter@cs.bris.ac.uk>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <asm/system.h>
 103 #include <linux/uaccess.h>
 104 #include <linux/kdb.h>
 105 #include <linux/ctype.h>
 106
 107 #define MAX_NR_CON_DRIVER 16
 108
 109 #define CON_DRIVER_FLAG_MODULE 1
 110 #define CON_DRIVER_FLAG_INIT   2
 111 #define CON_DRIVER_FLAG_ATTR   4
 112
 113 struct con_driver {
 114         const struct consw *con;
 115         const char *desc;
 116         struct device *dev;
 117         int node;
 118         int first;
 119         int last;
 120         int flag;
 121 };
 122
 123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 124 const struct consw *conswitchp;
 125
 126 /* A bitmap for codes <32. A bit of 1 indicates that the code
 127  * corresponding to that bit number invokes some special action
 128  * (such as cursor movement) and should not be displayed as a
 129  * glyph unless the disp_ctrl mode is explicitly enabled.
 130  */
 131 #define CTRL_ACTION 0x0d00ff81
 132 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 133
 134 /*
 135  * Here is the default bell parameters: 750HZ, 1/8th of a second
 136  */
 137 #define DEFAULT_BELL_PITCH      750
 138 #define DEFAULT_BELL_DURATION   (HZ/8)
 139
 140 struct vc vc_cons [MAX_NR_CONSOLES];
 141
 142 #ifndef VT_SINGLE_DRIVER
 143 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 144 #endif
 145
 146 static int con_open(struct tty_struct *, struct file *);
 147 static void vc_init(struct vc_data *vc, unsigned int rows,
 148                     unsigned int cols, int do_clear);
 149 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 150 static void save_cur(struct vc_data *vc);
 151 static void reset_terminal(struct vc_data *vc, int do_clear);
 152 static void con_flush_chars(struct tty_struct *tty);
 153 static int set_vesa_blanking(char __user *p);
 154 static void set_cursor(struct vc_data *vc);
 155 static void hide_cursor(struct vc_data *vc);
 156 static void console_callback(struct work_struct *ignored);
 157 static void blank_screen_t(unsigned long dummy);
 158 static void set_palette(struct vc_data *vc);
 159
 160 static int printable;           /* Is console ready for printing? */
 161 int default_utf8 = true;
 162 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 163 int global_cursor_default = -1;
 164 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 165
 166 static int cur_default = CUR_DEFAULT;
 167 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 168
 169 /*
 170  * ignore_poke: don't unblank the screen when things are typed.  This is
 171  * mainly for the privacy of braille terminal users.
 172  */
 173 static int ignore_poke;
 174
 175 int do_poke_blanked_console;
 176 int console_blanked;
 177
 178 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 179 static int vesa_off_interval;
 180 static int blankinterval = 10*60;
 181 core_param(consoleblank, blankinterval, int, 0444);
 182
 183 static DECLARE_WORK(console_work, console_callback);
 184
 185 /*
 186  * fg_console is the current virtual console,
 187  * last_console is the last used one,
 188  * want_console is the console we want to switch to,
 189  * saved_* variants are for save/restore around kernel debugger enter/leave
 190  */
 191 int fg_console;
 192 int last_console;
 193 int want_console = -1;
 194 static int saved_fg_console;
 195 static int saved_last_console;
 196 static int saved_want_console;
 197 static int saved_vc_mode;
 198 static int saved_console_blanked;
 199
 200 /*
 201  * For each existing display, we have a pointer to console currently visible
 202  * on that display, allowing consoles other than fg_console to be refreshed
 203  * appropriately. Unless the low-level driver supplies its own display_fg
 204  * variable, we use this one for the "master display".
 205  */
 206 static struct vc_data *master_display_fg;
 207
 208 /*
 209  * Unfortunately, we need to delay tty echo when we're currently writing to the
 210  * console since the code is (and always was) not re-entrant, so we schedule
 211  * all flip requests to process context with schedule-task() and run it from
 212  * console_callback().
 213  */
 214
 215 /*
 216  * For the same reason, we defer scrollback to the console callback.
 217  */
 218 static int scrollback_delta;
 219
 220 /*
 221  * Hook so that the power management routines can (un)blank
 222  * the console on our behalf.
 223  */
 224 int (*console_blank_hook)(int);
 225
 226 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 227 static int blank_state;
 228 static int blank_timer_expired;
 229 enum {
 230         blank_off = 0,
 231         blank_normal_wait,
 232         blank_vesa_wait,
 233 };
 234
 235 /*
 236  * /sys/class/tty/tty0/
 237  *
 238  * the attribute 'active' contains the name of the current vc
 239  * console and it supports poll() to detect vc switches
 240  */
 241 static struct device *tty0dev;
 242
 243 /*
 244  * Notifier list for console events.
 245  */
 246 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 247
 248 int register_vt_notifier(struct notifier_block *nb)
 249 {
 250         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 251 }
 252 EXPORT_SYMBOL_GPL(register_vt_notifier);
 253
 254 int unregister_vt_notifier(struct notifier_block *nb)
 255 {
 256         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 257 }
 258 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 259
 260 static void notify_write(struct vc_data *vc, unsigned int unicode)
 261 {
 262         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 263         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 264 }
 265
 266 static void notify_update(struct vc_data *vc)
 267 {
 268         struct vt_notifier_param param = { .vc = vc };
 269         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 270 }
 271 /*
 272  *      Low-Level Functions
 273  */
 274
 275 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 276
 277 #ifdef VT_BUF_VRAM_ONLY
 278 #define DO_UPDATE(vc)   0
 279 #else
 280 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 281 #endif
 282
 283 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 284 {
 285         unsigned short *p;
 286
 287         if (!viewed)
 288                 p = (unsigned short *)(vc->vc_origin + offset);
 289         else if (!vc->vc_sw->con_screen_pos)
 290                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 291         else
 292                 p = vc->vc_sw->con_screen_pos(vc, offset);
 293         return p;
 294 }
 295
 296 /* Called  from the keyboard irq path.. */
 297 static inline void scrolldelta(int lines)
 298 {
 299         /* FIXME */
 300         /* scrolldelta needs some kind of consistency lock, but the BKL was
 301            and still is not protecting versus the scheduled back end */
 302         scrollback_delta += lines;
 303         schedule_console_callback();
 304 }
 305
 306 void schedule_console_callback(void)
 307 {
 308         schedule_work(&console_work);
 309 }
 310
 311 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 312 {
 313         unsigned short *d, *s;
 314
 315         if (t+nr >= b)
 316                 nr = b - t - 1;
 317         if (b > vc->vc_rows || t >= b || nr < 1)
 318                 return;
 319         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 320                 return;
 321         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 322         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 323         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 324         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 325                     vc->vc_size_row * nr);
 326 }
 327
 328 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 329 {
 330         unsigned short *s;
 331         unsigned int step;
 332
 333         if (t+nr >= b)
 334                 nr = b - t - 1;
 335         if (b > vc->vc_rows || t >= b || nr < 1)
 336                 return;
 337         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 338                 return;
 339         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 340         step = vc->vc_cols * nr;
 341         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 342         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 343 }
 344
 345 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 346 {
 347 #ifndef VT_BUF_VRAM_ONLY
 348         unsigned int xx, yy, offset;
 349         u16 *p;
 350
 351         p = (u16 *) start;
 352         if (!vc->vc_sw->con_getxy) {
 353                 offset = (start - vc->vc_origin) / 2;
 354                 xx = offset % vc->vc_cols;
 355                 yy = offset / vc->vc_cols;
 356         } else {
 357                 int nxx, nyy;
 358                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 359                 xx = nxx; yy = nyy;
 360         }
 361         for(;;) {
 362                 u16 attrib = scr_readw(p) & 0xff00;
 363                 int startx = xx;
 364                 u16 *q = p;
 365                 while (xx < vc->vc_cols && count) {
 366                         if (attrib != (scr_readw(p) & 0xff00)) {
 367                                 if (p > q)
 368                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 369                                 startx = xx;
 370                                 q = p;
 371                                 attrib = scr_readw(p) & 0xff00;
 372                         }
 373                         p++;
 374                         xx++;
 375                         count--;
 376                 }
 377                 if (p > q)
 378                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 379                 if (!count)
 380                         break;
 381                 xx = 0;
 382                 yy++;
 383                 if (vc->vc_sw->con_getxy) {
 384                         p = (u16 *)start;
 385                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 386                 }
 387         }
 388 #endif
 389 }
 390
 391 void update_region(struct vc_data *vc, unsigned long start, int count)
 392 {
 393         WARN_CONSOLE_UNLOCKED();
 394
 395         if (DO_UPDATE(vc)) {
 396                 hide_cursor(vc);
 397                 do_update_region(vc, start, count);
 398                 set_cursor(vc);
 399         }
 400 }
 401
 402 /* Structure of attributes is hardware-dependent */
 403
 404 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 405     u8 _underline, u8 _reverse, u8 _italic)
 406 {
 407         if (vc->vc_sw->con_build_attr)
 408                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 409                        _blink, _underline, _reverse, _italic);
 410
 411 #ifndef VT_BUF_VRAM_ONLY
 412 /*
 413  * ++roman: I completely changed the attribute format for monochrome
 414  * mode (!can_do_color). The formerly used MDA (monochrome display
 415  * adapter) format didn't allow the combination of certain effects.
 416  * Now the attribute is just a bit vector:
 417  *  Bit 0..1: intensity (0..2)
 418  *  Bit 2   : underline
 419  *  Bit 3   : reverse
 420  *  Bit 7   : blink
 421  */
 422         {
 423         u8 a = _color;
 424         if (!vc->vc_can_do_color)
 425                 return _intensity |
 426                        (_italic ? 2 : 0) |
 427                        (_underline ? 4 : 0) |
 428                        (_reverse ? 8 : 0) |
 429                        (_blink ? 0x80 : 0);
 430         if (_italic)
 431                 a = (a & 0xF0) | vc->vc_itcolor;
 432         else if (_underline)
 433                 a = (a & 0xf0) | vc->vc_ulcolor;
 434         else if (_intensity == 0)
 435                 a = (a & 0xf0) | vc->vc_ulcolor;
 436         if (_reverse)
 437                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 438         if (_blink)
 439                 a ^= 0x80;
 440         if (_intensity == 2)
 441                 a ^= 0x08;
 442         if (vc->vc_hi_font_mask == 0x100)
 443                 a <<= 1;
 444         return a;
 445         }
 446 #else
 447         return 0;
 448 #endif
 449 }
 450
 451 static void update_attr(struct vc_data *vc)
 452 {
 453         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 454                       vc->vc_blink, vc->vc_underline,
 455                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 456         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 457 }
 458
 459 /* Note: inverting the screen twice should revert to the original state */
 460 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 461 {
 462         unsigned short *p;
 463
 464         WARN_CONSOLE_UNLOCKED();
 465
 466         count /= 2;
 467         p = screenpos(vc, offset, viewed);
 468         if (vc->vc_sw->con_invert_region)
 469                 vc->vc_sw->con_invert_region(vc, p, count);
 470 #ifndef VT_BUF_VRAM_ONLY
 471         else {
 472                 u16 *q = p;
 473                 int cnt = count;
 474                 u16 a;
 475
 476                 if (!vc->vc_can_do_color) {
 477                         while (cnt--) {
 478                             a = scr_readw(q);
 479                             a ^= 0x0800;
 480                             scr_writew(a, q);
 481                             q++;
 482                         }
 483                 } else if (vc->vc_hi_font_mask == 0x100) {
 484                         while (cnt--) {
 485                                 a = scr_readw(q);
 486                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 487                                 scr_writew(a, q);
 488                                 q++;
 489                         }
 490                 } else {
 491                         while (cnt--) {
 492                                 a = scr_readw(q);
 493                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 494                                 scr_writew(a, q);
 495                                 q++;
 496                         }
 497                 }
 498         }
 499 #endif
 500         if (DO_UPDATE(vc))
 501                 do_update_region(vc, (unsigned long) p, count);
 502         notify_update(vc);
 503 }
 504
 505 /* used by selection: complement pointer position */
 506 void complement_pos(struct vc_data *vc, int offset)
 507 {
 508         static int old_offset = -1;
 509         static unsigned short old;
 510         static unsigned short oldx, oldy;
 511
 512         WARN_CONSOLE_UNLOCKED();
 513
 514         if (old_offset != -1 && old_offset >= 0 &&
 515             old_offset < vc->vc_screenbuf_size) {
 516                 scr_writew(old, screenpos(vc, old_offset, 1));
 517                 if (DO_UPDATE(vc))
 518                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 519                 notify_update(vc);
 520         }
 521
 522         old_offset = offset;
 523
 524         if (offset != -1 && offset >= 0 &&
 525             offset < vc->vc_screenbuf_size) {
 526                 unsigned short new;
 527                 unsigned short *p;
 528                 p = screenpos(vc, offset, 1);
 529                 old = scr_readw(p);
 530                 new = old ^ vc->vc_complement_mask;
 531                 scr_writew(new, p);
 532                 if (DO_UPDATE(vc)) {
 533                         oldx = (offset >> 1) % vc->vc_cols;
 534                         oldy = (offset >> 1) / vc->vc_cols;
 535                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 536                 }
 537                 notify_update(vc);
 538         }
 539 }
 540
 541 static void insert_char(struct vc_data *vc, unsigned int nr)
 542 {
 543         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 544
 545         p = q + vc->vc_cols - nr - vc->vc_x;
 546         while (--p >= q)
 547                 scr_writew(scr_readw(p), p + nr);
 548         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 549         vc->vc_need_wrap = 0;
 550         if (DO_UPDATE(vc)) {
 551                 unsigned short oldattr = vc->vc_attr;
 552                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 553                                      vc->vc_cols - vc->vc_x - nr);
 554                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 555                 while (nr--)
 556                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 557                 vc->vc_attr = oldattr;
 558         }
 559 }
 560
 561 static void delete_char(struct vc_data *vc, unsigned int nr)
 562 {
 563         unsigned int i = vc->vc_x;
 564         unsigned short *p = (unsigned short *)vc->vc_pos;
 565
 566         while (++i <= vc->vc_cols - nr) {
 567                 scr_writew(scr_readw(p+nr), p);
 568                 p++;
 569         }
 570         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 571         vc->vc_need_wrap = 0;
 572         if (DO_UPDATE(vc)) {
 573                 unsigned short oldattr = vc->vc_attr;
 574                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 575                                      vc->vc_cols - vc->vc_x - nr);
 576                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 577                 while (nr--)
 578                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 579                                      vc->vc_cols - 1 - nr);
 580                 vc->vc_attr = oldattr;
 581         }
 582 }
 583
 584 static int softcursor_original;
 585
 586 static void add_softcursor(struct vc_data *vc)
 587 {
 588         int i = scr_readw((u16 *) vc->vc_pos);
 589         u32 type = vc->vc_cursor_type;
 590
 591         if (! (type & 0x10)) return;
 592         if (softcursor_original != -1) return;
 593         softcursor_original = i;
 594         i |= ((type >> 8) & 0xff00 );
 595         i ^= ((type) & 0xff00 );
 596         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 597         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 598         scr_writew(i, (u16 *) vc->vc_pos);
 599         if (DO_UPDATE(vc))
 600                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 601 }
 602
 603 static void hide_softcursor(struct vc_data *vc)
 604 {
 605         if (softcursor_original != -1) {
 606                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 607                 if (DO_UPDATE(vc))
 608                         vc->vc_sw->con_putc(vc, softcursor_original,
 609                                         vc->vc_y, vc->vc_x);
 610                 softcursor_original = -1;
 611         }
 612 }
 613
 614 static void hide_cursor(struct vc_data *vc)
 615 {
 616         if (vc == sel_cons)
 617                 clear_selection();
 618         vc->vc_sw->con_cursor(vc, CM_ERASE);
 619         hide_softcursor(vc);
 620 }
 621
 622 static void set_cursor(struct vc_data *vc)
 623 {
 624         if (!IS_FG(vc) || console_blanked ||
 625             vc->vc_mode == KD_GRAPHICS)
 626                 return;
 627         if (vc->vc_deccm) {
 628                 if (vc == sel_cons)
 629                         clear_selection();
 630                 add_softcursor(vc);
 631                 if ((vc->vc_cursor_type & 0x0f) != 1)
 632                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 633         } else
 634                 hide_cursor(vc);
 635 }
 636
 637 static void set_origin(struct vc_data *vc)
 638 {
 639         WARN_CONSOLE_UNLOCKED();
 640
 641         if (!CON_IS_VISIBLE(vc) ||
 642             !vc->vc_sw->con_set_origin ||
 643             !vc->vc_sw->con_set_origin(vc))
 644                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 645         vc->vc_visible_origin = vc->vc_origin;
 646         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 647         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 648 }
 649
 650 static inline void save_screen(struct vc_data *vc)
 651 {
 652         WARN_CONSOLE_UNLOCKED();
 653
 654         if (vc->vc_sw->con_save_screen)
 655                 vc->vc_sw->con_save_screen(vc);
 656 }
 657
 658 /*
 659  *      Redrawing of screen
 660  */
 661
 662 void clear_buffer_attributes(struct vc_data *vc)
 663 {
 664         unsigned short *p = (unsigned short *)vc->vc_origin;
 665         int count = vc->vc_screenbuf_size / 2;
 666         int mask = vc->vc_hi_font_mask | 0xff;
 667
 668         for (; count > 0; count--, p++) {
 669                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 670         }
 671 }
 672
 673 void redraw_screen(struct vc_data *vc, int is_switch)
 674 {
 675         int redraw = 0;
 676
 677         WARN_CONSOLE_UNLOCKED();
 678
 679         if (!vc) {
 680                 /* strange ... */
 681                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 682                 return;
 683         }
 684
 685         if (is_switch) {
 686                 struct vc_data *old_vc = vc_cons[fg_console].d;
 687                 if (old_vc == vc)
 688                         return;
 689                 if (!CON_IS_VISIBLE(vc))
 690                         redraw = 1;
 691                 *vc->vc_display_fg = vc;
 692                 fg_console = vc->vc_num;
 693                 hide_cursor(old_vc);
 694                 if (!CON_IS_VISIBLE(old_vc)) {
 695                         save_screen(old_vc);
 696                         set_origin(old_vc);
 697                 }
 698                 if (tty0dev)
 699                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 700         } else {
 701                 hide_cursor(vc);
 702                 redraw = 1;
 703         }
 704
 705         if (redraw) {
 706                 int update;
 707                 int old_was_color = vc->vc_can_do_color;
 708
 709                 set_origin(vc);
 710                 update = vc->vc_sw->con_switch(vc);
 711                 set_palette(vc);
 712                 /*
 713                  * If console changed from mono<->color, the best we can do
 714                  * is to clear the buffer attributes. As it currently stands,
 715                  * rebuilding new attributes from the old buffer is not doable
 716                  * without overly complex code.
 717                  */
 718                 if (old_was_color != vc->vc_can_do_color) {
 719                         update_attr(vc);
 720                         clear_buffer_attributes(vc);
 721                 }
 722
 723                 /* Forcibly update if we're panicing */
 724                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 725                     vt_force_oops_output(vc))
 726                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 727         }
 728         set_cursor(vc);
 729         if (is_switch) {
 730                 set_leds();
 731                 compute_shiftstate();
 732                 notify_update(vc);
 733         }
 734 }
 735
 736 /*
 737  *      Allocation, freeing and resizing of VTs.
 738  */
 739
 740 int vc_cons_allocated(unsigned int i)
 741 {
 742         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 743 }
 744
 745 static void visual_init(struct vc_data *vc, int num, int init)
 746 {
 747         /* ++Geert: vc->vc_sw->con_init determines console size */
 748         if (vc->vc_sw)
 749                 module_put(vc->vc_sw->owner);
 750         vc->vc_sw = conswitchp;
 751 #ifndef VT_SINGLE_DRIVER
 752         if (con_driver_map[num])
 753                 vc->vc_sw = con_driver_map[num];
 754 #endif
 755         __module_get(vc->vc_sw->owner);
 756         vc->vc_num = num;
 757         vc->vc_display_fg = &master_display_fg;
 758         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 759         vc->vc_uni_pagedir = 0;
 760         vc->vc_hi_font_mask = 0;
 761         vc->vc_complement_mask = 0;
 762         vc->vc_can_do_color = 0;
 763         vc->vc_panic_force_write = false;
 764         vc->vc_sw->con_init(vc, init);
 765         if (!vc->vc_complement_mask)
 766                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 767         vc->vc_s_complement_mask = vc->vc_complement_mask;
 768         vc->vc_size_row = vc->vc_cols << 1;
 769         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 770 }
 771
 772 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 773 {
 774         WARN_CONSOLE_UNLOCKED();
 775
 776         if (currcons >= MAX_NR_CONSOLES)
 777                 return -ENXIO;
 778         if (!vc_cons[currcons].d) {
 779             struct vc_data *vc;
 780             struct vt_notifier_param param;
 781
 782             /* prevent users from taking too much memory */
 783             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 784               return -EPERM;
 785
 786             /* due to the granularity of kmalloc, we waste some memory here */
 787             /* the alloc is done in two steps, to optimize the common situation
 788                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 789             /* although the numbers above are not valid since long ago, the
 790                point is still up-to-date and the comment still has its value
 791                even if only as a historical artifact.  --mj, July 1998 */
 792             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 793             if (!vc)
 794                 return -ENOMEM;
 795             vc_cons[currcons].d = vc;
 796             tty_port_init(&vc->port);
 797             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 798             visual_init(vc, currcons, 1);
 799             if (!*vc->vc_uni_pagedir_loc)
 800                 con_set_default_unimap(vc);
 801             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 802             if (!vc->vc_screenbuf) {
 803                 kfree(vc);
 804                 vc_cons[currcons].d = NULL;
 805                 return -ENOMEM;
 806             }
 807
 808             /* If no drivers have overridden us and the user didn't pass a
 809                boot option, default to displaying the cursor */
 810             if (global_cursor_default == -1)
 811                     global_cursor_default = 1;
 812
 813             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 814             vcs_make_sysfs(currcons);
 815             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 816         }
 817         return 0;
 818 }
 819
 820 static inline int resize_screen(struct vc_data *vc, int width, int height,
 821                                 int user)
 822 {
 823         /* Resizes the resolution of the display adapater */
 824         int err = 0;
 825
 826         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 827                 err = vc->vc_sw->con_resize(vc, width, height, user);
 828
 829         return err;
 830 }
 831
 832 /*
 833  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 834  * [this is to be used together with some user program
 835  * like resize that changes the hardware videomode]
 836  */
 837 #define VC_RESIZE_MAXCOL (32767)
 838 #define VC_RESIZE_MAXROW (32767)
 839
 840 /**
 841  *      vc_do_resize    -       resizing method for the tty
 842  *      @tty: tty being resized
 843  *      @real_tty: real tty (different to tty if a pty/tty pair)
 844  *      @vc: virtual console private data
 845  *      @cols: columns
 846  *      @lines: lines
 847  *
 848  *      Resize a virtual console, clipping according to the actual constraints.
 849  *      If the caller passes a tty structure then update the termios winsize
 850  *      information and perform any necessary signal handling.
 851  *
 852  *      Caller must hold the console semaphore. Takes the termios mutex and
 853  *      ctrl_lock of the tty IFF a tty is passed.
 854  */
 855
 856 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 857                                 unsigned int cols, unsigned int lines)
 858 {
 859         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 860         unsigned long end;
 861         unsigned int old_rows, old_row_size;
 862         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 863         unsigned int user;
 864         unsigned short *newscreen;
 865
 866         WARN_CONSOLE_UNLOCKED();
 867
 868         if (!vc)
 869                 return -ENXIO;
 870
 871         user = vc->vc_resize_user;
 872         vc->vc_resize_user = 0;
 873
 874         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 875                 return -EINVAL;
 876
 877         new_cols = (cols ? cols : vc->vc_cols);
 878         new_rows = (lines ? lines : vc->vc_rows);
 879         new_row_size = new_cols << 1;
 880         new_screen_size = new_row_size * new_rows;
 881
 882         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 883                 return 0;
 884
 885         if (new_screen_size > (4 << 20))
 886                 return -EINVAL;
 887         newscreen = kmalloc(new_screen_size, GFP_USER);
 888         if (!newscreen)
 889                 return -ENOMEM;
 890
 891         old_rows = vc->vc_rows;
 892         old_row_size = vc->vc_size_row;
 893
 894         err = resize_screen(vc, new_cols, new_rows, user);
 895         if (err) {
 896                 kfree(newscreen);
 897                 return err;
 898         }
 899
 900         vc->vc_rows = new_rows;
 901         vc->vc_cols = new_cols;
 902         vc->vc_size_row = new_row_size;
 903         vc->vc_screenbuf_size = new_screen_size;
 904
 905         rlth = min(old_row_size, new_row_size);
 906         rrem = new_row_size - rlth;
 907         old_origin = vc->vc_origin;
 908         new_origin = (long) newscreen;
 909         new_scr_end = new_origin + new_screen_size;
 910
 911         if (vc->vc_y > new_rows) {
 912                 if (old_rows - vc->vc_y < new_rows) {
 913                         /*
 914                          * Cursor near the bottom, copy contents from the
 915                          * bottom of buffer
 916                          */
 917                         old_origin += (old_rows - new_rows) * old_row_size;
 918                 } else {
 919                         /*
 920                          * Cursor is in no man's land, copy 1/2 screenful
 921                          * from the top and bottom of cursor position
 922                          */
 923                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 924                 }
 925         }
 926
 927         end = old_origin + old_row_size * min(old_rows, new_rows);
 928
 929         update_attr(vc);
 930
 931         while (old_origin < end) {
 932                 scr_memcpyw((unsigned short *) new_origin,
 933                             (unsigned short *) old_origin, rlth);
 934                 if (rrem)
 935                         scr_memsetw((void *)(new_origin + rlth),
 936                                     vc->vc_video_erase_char, rrem);
 937                 old_origin += old_row_size;
 938                 new_origin += new_row_size;
 939         }
 940         if (new_scr_end > new_origin)
 941                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 942                             new_scr_end - new_origin);
 943         kfree(vc->vc_screenbuf);
 944         vc->vc_screenbuf = newscreen;
 945         vc->vc_screenbuf_size = new_screen_size;
 946         set_origin(vc);
 947
 948         /* do part of a reset_terminal() */
 949         vc->vc_top = 0;
 950         vc->vc_bottom = vc->vc_rows;
 951         gotoxy(vc, vc->vc_x, vc->vc_y);
 952         save_cur(vc);
 953
 954         if (tty) {
 955                 /* Rewrite the requested winsize data with the actual
 956                    resulting sizes */
 957                 struct winsize ws;
 958                 memset(&ws, 0, sizeof(ws));
 959                 ws.ws_row = vc->vc_rows;
 960                 ws.ws_col = vc->vc_cols;
 961                 ws.ws_ypixel = vc->vc_scan_lines;
 962                 tty_do_resize(tty, &ws);
 963         }
 964
 965         if (CON_IS_VISIBLE(vc))
 966                 update_screen(vc);
 967         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 968         return err;
 969 }
 970
 971 /**
 972  *      vc_resize               -       resize a VT
 973  *      @vc: virtual console
 974  *      @cols: columns
 975  *      @rows: rows
 976  *
 977  *      Resize a virtual console as seen from the console end of things. We
 978  *      use the common vc_do_resize methods to update the structures. The
 979  *      caller must hold the console sem to protect console internals and
 980  *      vc->port.tty
 981  */
 982
 983 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 984 {
 985         return vc_do_resize(vc->port.tty, vc, cols, rows);
 986 }
 987
 988 /**
 989  *      vt_resize               -       resize a VT
 990  *      @tty: tty to resize
 991  *      @ws: winsize attributes
 992  *
 993  *      Resize a virtual terminal. This is called by the tty layer as we
 994  *      register our own handler for resizing. The mutual helper does all
 995  *      the actual work.
 996  *
 997  *      Takes the console sem and the called methods then take the tty
 998  *      termios_mutex and the tty ctrl_lock in that order.
 999  */
1000 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1001 {
1002         struct vc_data *vc = tty->driver_data;
1003         int ret;
1004
1005         console_lock();
1006         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1007         console_unlock();
1008         return ret;
1009 }
1010
1011 void vc_deallocate(unsigned int currcons)
1012 {
1013         WARN_CONSOLE_UNLOCKED();
1014
1015         if (vc_cons_allocated(currcons)) {
1016                 struct vc_data *vc = vc_cons[currcons].d;
1017                 struct vt_notifier_param param = { .vc = vc };
1018
1019                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1020                 vcs_remove_sysfs(currcons);
1021                 vc->vc_sw->con_deinit(vc);
1022                 put_pid(vc->vt_pid);
1023                 module_put(vc->vc_sw->owner);
1024                 kfree(vc->vc_screenbuf);
1025                 if (currcons >= MIN_NR_CONSOLES)
1026                         kfree(vc);
1027                 vc_cons[currcons].d = NULL;
1028         }
1029 }
1030
1031 /*
1032  *      VT102 emulator
1033  */
1034
1035 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1036 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1037 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1038
1039 #define decarm          VC_REPEAT
1040 #define decckm          VC_CKMODE
1041 #define kbdapplic       VC_APPLIC
1042 #define lnm             VC_CRLF
1043
1044 /*
1045  * this is what the terminal answers to a ESC-Z or csi0c query.
1046  */
1047 #define VT100ID "\033[?1;2c"
1048 #define VT102ID "\033[?6c"
1049
1050 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1051                                        8,12,10,14, 9,13,11,15 };
1052
1053 /* the default colour table, for VGA+ colour systems */
1054 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1055     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1056 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1057     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1058 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1059     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1060
1061 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1062 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1063 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1064
1065 /*
1066  * gotoxy() must verify all boundaries, because the arguments
1067  * might also be negative. If the given position is out of
1068  * bounds, the cursor is placed at the nearest margin.
1069  */
1070 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1071 {
1072         int min_y, max_y;
1073
1074         if (new_x < 0)
1075                 vc->vc_x = 0;
1076         else {
1077                 if (new_x >= vc->vc_cols)
1078                         vc->vc_x = vc->vc_cols - 1;
1079                 else
1080                         vc->vc_x = new_x;
1081         }
1082
1083         if (vc->vc_decom) {
1084                 min_y = vc->vc_top;
1085                 max_y = vc->vc_bottom;
1086         } else {
1087                 min_y = 0;
1088                 max_y = vc->vc_rows;
1089         }
1090         if (new_y < min_y)
1091                 vc->vc_y = min_y;
1092         else if (new_y >= max_y)
1093                 vc->vc_y = max_y - 1;
1094         else
1095                 vc->vc_y = new_y;
1096         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1097         vc->vc_need_wrap = 0;
1098 }
1099
1100 /* for absolute user moves, when decom is set */
1101 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1102 {
1103         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1104 }
1105
1106 void scrollback(struct vc_data *vc, int lines)
1107 {
1108         if (!lines)
1109                 lines = vc->vc_rows / 2;
1110         scrolldelta(-lines);
1111 }
1112
1113 void scrollfront(struct vc_data *vc, int lines)
1114 {
1115         if (!lines)
1116                 lines = vc->vc_rows / 2;
1117         scrolldelta(lines);
1118 }
1119
1120 static void lf(struct vc_data *vc)
1121 {
1122         /* don't scroll if above bottom of scrolling region, or
1123          * if below scrolling region
1124          */
1125         if (vc->vc_y + 1 == vc->vc_bottom)
1126                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1127         else if (vc->vc_y < vc->vc_rows - 1) {
1128                 vc->vc_y++;
1129                 vc->vc_pos += vc->vc_size_row;
1130         }
1131         vc->vc_need_wrap = 0;
1132         notify_write(vc, '\n');
1133 }
1134
1135 static void ri(struct vc_data *vc)
1136 {
1137         /* don't scroll if below top of scrolling region, or
1138          * if above scrolling region
1139          */
1140         if (vc->vc_y == vc->vc_top)
1141                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1142         else if (vc->vc_y > 0) {
1143                 vc->vc_y--;
1144                 vc->vc_pos -= vc->vc_size_row;
1145         }
1146         vc->vc_need_wrap = 0;
1147 }
1148
1149 static inline void cr(struct vc_data *vc)
1150 {
1151         vc->vc_pos -= vc->vc_x << 1;
1152         vc->vc_need_wrap = vc->vc_x = 0;
1153         notify_write(vc, '\r');
1154 }
1155
1156 static inline void bs(struct vc_data *vc)
1157 {
1158         if (vc->vc_x) {
1159                 vc->vc_pos -= 2;
1160                 vc->vc_x--;
1161                 vc->vc_need_wrap = 0;
1162                 notify_write(vc, '\b');
1163         }
1164 }
1165
1166 static inline void del(struct vc_data *vc)
1167 {
1168         /* ignored */
1169 }
1170
1171 static void csi_J(struct vc_data *vc, int vpar)
1172 {
1173         unsigned int count;
1174         unsigned short * start;
1175
1176         switch (vpar) {
1177                 case 0: /* erase from cursor to end of display */
1178                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1179                         start = (unsigned short *)vc->vc_pos;
1180                         if (DO_UPDATE(vc)) {
1181                                 /* do in two stages */
1182                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1183                                               vc->vc_cols - vc->vc_x);
1184                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1185                                               vc->vc_rows - vc->vc_y - 1,
1186                                               vc->vc_cols);
1187                         }
1188                         break;
1189                 case 1: /* erase from start to cursor */
1190                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1191                         start = (unsigned short *)vc->vc_origin;
1192                         if (DO_UPDATE(vc)) {
1193                                 /* do in two stages */
1194                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1195                                               vc->vc_cols);
1196                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1197                                               vc->vc_x + 1);
1198                         }
1199                         break;
1200                 case 3: /* erase scroll-back buffer (and whole display) */
1201                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1202                                     vc->vc_screenbuf_size);
1203                         set_origin(vc);
1204                         if (CON_IS_VISIBLE(vc))
1205                                 update_screen(vc);
1206                         /* fall through */
1207                 case 2: /* erase whole display */
1208                         count = vc->vc_cols * vc->vc_rows;
1209                         start = (unsigned short *)vc->vc_origin;
1210                         if (DO_UPDATE(vc))
1211                                 vc->vc_sw->con_clear(vc, 0, 0,
1212                                               vc->vc_rows,
1213                                               vc->vc_cols);
1214                         break;
1215                 default:
1216                         return;
1217         }
1218         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1219         vc->vc_need_wrap = 0;
1220 }
1221
1222 static void csi_K(struct vc_data *vc, int vpar)
1223 {
1224         unsigned int count;
1225         unsigned short * start;
1226
1227         switch (vpar) {
1228                 case 0: /* erase from cursor to end of line */
1229                         count = vc->vc_cols - vc->vc_x;
1230                         start = (unsigned short *)vc->vc_pos;
1231                         if (DO_UPDATE(vc))
1232                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1233                                                      vc->vc_cols - vc->vc_x);
1234                         break;
1235                 case 1: /* erase from start of line to cursor */
1236                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1237                         count = vc->vc_x + 1;
1238                         if (DO_UPDATE(vc))
1239                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1240                                                      vc->vc_x + 1);
1241                         break;
1242                 case 2: /* erase whole line */
1243                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1244                         count = vc->vc_cols;
1245                         if (DO_UPDATE(vc))
1246                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1247                                               vc->vc_cols);
1248                         break;
1249                 default:
1250                         return;
1251         }
1252         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1253         vc->vc_need_wrap = 0;
1254 }
1255
1256 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1257 {                                         /* not vt100? */
1258         int count;
1259
1260         if (!vpar)
1261                 vpar++;
1262         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1263
1264         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1265         if (DO_UPDATE(vc))
1266                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1267         vc->vc_need_wrap = 0;
1268 }
1269
1270 static void default_attr(struct vc_data *vc)
1271 {
1272         vc->vc_intensity = 1;
1273         vc->vc_italic = 0;
1274         vc->vc_underline = 0;
1275         vc->vc_reverse = 0;
1276         vc->vc_blink = 0;
1277         vc->vc_color = vc->vc_def_color;
1278 }
1279
1280 /* console_lock is held */
1281 static void csi_m(struct vc_data *vc)
1282 {
1283         int i;
1284
1285         for (i = 0; i <= vc->vc_npar; i++)
1286                 switch (vc->vc_par[i]) {
1287                         case 0: /* all attributes off */
1288                                 default_attr(vc);
1289                                 break;
1290                         case 1:
1291                                 vc->vc_intensity = 2;
1292                                 break;
1293                         case 2:
1294                                 vc->vc_intensity = 0;
1295                                 break;
1296                         case 3:
1297                                 vc->vc_italic = 1;
1298                                 break;
1299                         case 4:
1300                                 vc->vc_underline = 1;
1301                                 break;
1302                         case 5:
1303                                 vc->vc_blink = 1;
1304                                 break;
1305                         case 7:
1306                                 vc->vc_reverse = 1;
1307                                 break;
1308                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1309                                   * Select primary font, don't display
1310                                   * control chars if defined, don't set
1311                                   * bit 8 on output.
1312                                   */
1313                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1314                                                 ? vc->vc_G0_charset
1315                                                 : vc->vc_G1_charset, vc);
1316                                 vc->vc_disp_ctrl = 0;
1317                                 vc->vc_toggle_meta = 0;
1318                                 break;
1319                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1320                                   * Select first alternate font, lets
1321                                   * chars < 32 be displayed as ROM chars.
1322                                   */
1323                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1324                                 vc->vc_disp_ctrl = 1;
1325                                 vc->vc_toggle_meta = 0;
1326                                 break;
1327                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1328                                   * Select second alternate font, toggle
1329                                   * high bit before displaying as ROM char.
1330                                   */
1331                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1332                                 vc->vc_disp_ctrl = 1;
1333                                 vc->vc_toggle_meta = 1;
1334                                 break;
1335                         case 21:
1336                         case 22:
1337                                 vc->vc_intensity = 1;
1338                                 break;
1339                         case 23:
1340                                 vc->vc_italic = 0;
1341                                 break;
1342                         case 24:
1343                                 vc->vc_underline = 0;
1344                                 break;
1345                         case 25:
1346                                 vc->vc_blink = 0;
1347                                 break;
1348                         case 27:
1349                                 vc->vc_reverse = 0;
1350                                 break;
1351                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1352                                   * Enables underscore, white foreground
1353                                   * with white underscore (Linux - use
1354                                   * default foreground).
1355                                   */
1356                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1357                                 vc->vc_underline = 1;
1358                                 break;
1359                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1360                                   * Disable underline option.
1361                                   * Reset colour to default? It did this
1362                                   * before...
1363                                   */
1364                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1365                                 vc->vc_underline = 0;
1366                                 break;
1367                         case 49:
1368                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1369                                 break;
1370                         default:
1371                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1372                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1373                                                 | (vc->vc_color & 0xf0);
1374                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1375                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1376                                                 | (vc->vc_color & 0x0f);
1377                                 break;
1378                 }
1379         update_attr(vc);
1380 }
1381
1382 static void respond_string(const char *p, struct tty_struct *tty)
1383 {
1384         while (*p) {
1385                 tty_insert_flip_char(tty, *p, 0);
1386                 p++;
1387         }
1388         con_schedule_flip(tty);
1389 }
1390
1391 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1392 {
1393         char buf[40];
1394
1395         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1396         respond_string(buf, tty);
1397 }
1398
1399 static inline void status_report(struct tty_struct *tty)
1400 {
1401         respond_string("\033[0n", tty); /* Terminal ok */
1402 }
1403
1404 static inline void respond_ID(struct tty_struct * tty)
1405 {
1406         respond_string(VT102ID, tty);
1407 }
1408
1409 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1410 {
1411         char buf[8];
1412
1413         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1414                 (char)('!' + mry));
1415         respond_string(buf, tty);
1416 }
1417
1418 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1419 int mouse_reporting(void)
1420 {
1421         return vc_cons[fg_console].d->vc_report_mouse;
1422 }
1423
1424 /* console_lock is held */
1425 static void set_mode(struct vc_data *vc, int on_off)
1426 {
1427         int i;
1428
1429         for (i = 0; i <= vc->vc_npar; i++)
1430                 if (vc->vc_ques) {
1431                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1432                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1433                                 if (on_off)
1434                                         set_kbd(vc, decckm);
1435                                 else
1436                                         clr_kbd(vc, decckm);
1437                                 break;
1438                         case 3: /* 80/132 mode switch unimplemented */
1439                                 vc->vc_deccolm = on_off;
1440 #if 0
1441                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1442                                 /* this alone does not suffice; some user mode
1443                                    utility has to change the hardware regs */
1444 #endif
1445                                 break;
1446                         case 5:                 /* Inverted screen on/off */
1447                                 if (vc->vc_decscnm != on_off) {
1448                                         vc->vc_decscnm = on_off;
1449                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1450                                         update_attr(vc);
1451                                 }
1452                                 break;
1453                         case 6:                 /* Origin relative/absolute */
1454                                 vc->vc_decom = on_off;
1455                                 gotoxay(vc, 0, 0);
1456                                 break;
1457                         case 7:                 /* Autowrap on/off */
1458                                 vc->vc_decawm = on_off;
1459                                 break;
1460                         case 8:                 /* Autorepeat on/off */
1461                                 if (on_off)
1462                                         set_kbd(vc, decarm);
1463                                 else
1464                                         clr_kbd(vc, decarm);
1465                                 break;
1466                         case 9:
1467                                 vc->vc_report_mouse = on_off ? 1 : 0;
1468                                 break;
1469                         case 25:                /* Cursor on/off */
1470                                 vc->vc_deccm = on_off;
1471                                 break;
1472                         case 1000:
1473                                 vc->vc_report_mouse = on_off ? 2 : 0;
1474                                 break;
1475                         }
1476                 } else {
1477                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1478                         case 3:                 /* Monitor (display ctrls) */
1479                                 vc->vc_disp_ctrl = on_off;
1480                                 break;
1481                         case 4:                 /* Insert Mode on/off */
1482                                 vc->vc_decim = on_off;
1483                                 break;
1484                         case 20:                /* Lf, Enter == CrLf/Lf */
1485                                 if (on_off)
1486                                         set_kbd(vc, lnm);
1487                                 else
1488                                         clr_kbd(vc, lnm);
1489                                 break;
1490                         }
1491                 }
1492 }
1493
1494 /* console_lock is held */
1495 static void setterm_command(struct vc_data *vc)
1496 {
1497         switch(vc->vc_par[0]) {
1498                 case 1: /* set color for underline mode */
1499                         if (vc->vc_can_do_color &&
1500                                         vc->vc_par[1] < 16) {
1501                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1502                                 if (vc->vc_underline)
1503                                         update_attr(vc);
1504                         }
1505                         break;
1506                 case 2: /* set color for half intensity mode */
1507                         if (vc->vc_can_do_color &&
1508                                         vc->vc_par[1] < 16) {
1509                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1510                                 if (vc->vc_intensity == 0)
1511                                         update_attr(vc);
1512                         }
1513                         break;
1514                 case 8: /* store colors as defaults */
1515                         vc->vc_def_color = vc->vc_attr;
1516                         if (vc->vc_hi_font_mask == 0x100)
1517                                 vc->vc_def_color >>= 1;
1518                         default_attr(vc);
1519                         update_attr(vc);
1520                         break;
1521                 case 9: /* set blanking interval */
1522                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1523                         poke_blanked_console();
1524                         break;
1525                 case 10: /* set bell frequency in Hz */
1526                         if (vc->vc_npar >= 1)
1527                                 vc->vc_bell_pitch = vc->vc_par[1];
1528                         else
1529                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1530                         break;
1531                 case 11: /* set bell duration in msec */
1532                         if (vc->vc_npar >= 1)
1533                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1534                                         vc->vc_par[1] * HZ / 1000 : 0;
1535                         else
1536                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1537                         break;
1538                 case 12: /* bring specified console to the front */
1539                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1540                                 set_console(vc->vc_par[1] - 1);
1541                         break;
1542                 case 13: /* unblank the screen */
1543                         poke_blanked_console();
1544                         break;
1545                 case 14: /* set vesa powerdown interval */
1546                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1547                         break;
1548                 case 15: /* activate the previous console */
1549                         set_console(last_console);
1550                         break;
1551         }
1552 }
1553
1554 /* console_lock is held */
1555 static void csi_at(struct vc_data *vc, unsigned int nr)
1556 {
1557         if (nr > vc->vc_cols - vc->vc_x)
1558                 nr = vc->vc_cols - vc->vc_x;
1559         else if (!nr)
1560                 nr = 1;
1561         insert_char(vc, nr);
1562 }
1563
1564 /* console_lock is held */
1565 static void csi_L(struct vc_data *vc, unsigned int nr)
1566 {
1567         if (nr > vc->vc_rows - vc->vc_y)
1568                 nr = vc->vc_rows - vc->vc_y;
1569         else if (!nr)
1570                 nr = 1;
1571         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1572         vc->vc_need_wrap = 0;
1573 }
1574
1575 /* console_lock is held */
1576 static void csi_P(struct vc_data *vc, unsigned int nr)
1577 {
1578         if (nr > vc->vc_cols - vc->vc_x)
1579                 nr = vc->vc_cols - vc->vc_x;
1580         else if (!nr)
1581                 nr = 1;
1582         delete_char(vc, nr);
1583 }
1584
1585 /* console_lock is held */
1586 static void csi_M(struct vc_data *vc, unsigned int nr)
1587 {
1588         if (nr > vc->vc_rows - vc->vc_y)
1589                 nr = vc->vc_rows - vc->vc_y;
1590         else if (!nr)
1591                 nr=1;
1592         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1593         vc->vc_need_wrap = 0;
1594 }
1595
1596 /* console_lock is held (except via vc_init->reset_terminal */
1597 static void save_cur(struct vc_data *vc)
1598 {
1599         vc->vc_saved_x          = vc->vc_x;
1600         vc->vc_saved_y          = vc->vc_y;
1601         vc->vc_s_intensity      = vc->vc_intensity;
1602         vc->vc_s_italic         = vc->vc_italic;
1603         vc->vc_s_underline      = vc->vc_underline;
1604         vc->vc_s_blink          = vc->vc_blink;
1605         vc->vc_s_reverse        = vc->vc_reverse;
1606         vc->vc_s_charset        = vc->vc_charset;
1607         vc->vc_s_color          = vc->vc_color;
1608         vc->vc_saved_G0         = vc->vc_G0_charset;
1609         vc->vc_saved_G1         = vc->vc_G1_charset;
1610 }
1611
1612 /* console_lock is held */
1613 static void restore_cur(struct vc_data *vc)
1614 {
1615         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1616         vc->vc_intensity        = vc->vc_s_intensity;
1617         vc->vc_italic           = vc->vc_s_italic;
1618         vc->vc_underline        = vc->vc_s_underline;
1619         vc->vc_blink            = vc->vc_s_blink;
1620         vc->vc_reverse          = vc->vc_s_reverse;
1621         vc->vc_charset          = vc->vc_s_charset;
1622         vc->vc_color            = vc->vc_s_color;
1623         vc->vc_G0_charset       = vc->vc_saved_G0;
1624         vc->vc_G1_charset       = vc->vc_saved_G1;
1625         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1626         update_attr(vc);
1627         vc->vc_need_wrap = 0;
1628 }
1629
1630 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1631         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1632         ESpalette };
1633
1634 /* console_lock is held (except via vc_init()) */
1635 static void reset_terminal(struct vc_data *vc, int do_clear)
1636 {
1637         vc->vc_top              = 0;
1638         vc->vc_bottom           = vc->vc_rows;
1639         vc->vc_state            = ESnormal;
1640         vc->vc_ques             = 0;
1641         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1642         vc->vc_G0_charset       = LAT1_MAP;
1643         vc->vc_G1_charset       = GRAF_MAP;
1644         vc->vc_charset          = 0;
1645         vc->vc_need_wrap        = 0;
1646         vc->vc_report_mouse     = 0;
1647         vc->vc_utf              = default_utf8;
1648         vc->vc_utf_count        = 0;
1649
1650         vc->vc_disp_ctrl        = 0;
1651         vc->vc_toggle_meta      = 0;
1652
1653         vc->vc_decscnm          = 0;
1654         vc->vc_decom            = 0;
1655         vc->vc_decawm           = 1;
1656         vc->vc_deccm            = global_cursor_default;
1657         vc->vc_decim            = 0;
1658
1659         set_kbd(vc, decarm);
1660         clr_kbd(vc, decckm);
1661         clr_kbd(vc, kbdapplic);
1662         clr_kbd(vc, lnm);
1663         kbd_table[vc->vc_num].lockstate = 0;
1664         kbd_table[vc->vc_num].slockstate = 0;
1665         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1666         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1667         /* do not do set_leds here because this causes an endless tasklet loop
1668            when the keyboard hasn't been initialized yet */
1669
1670         vc->vc_cursor_type = cur_default;
1671         vc->vc_complement_mask = vc->vc_s_complement_mask;
1672
1673         default_attr(vc);
1674         update_attr(vc);
1675
1676         vc->vc_tab_stop[0]      = 0x01010100;
1677         vc->vc_tab_stop[1]      =
1678         vc->vc_tab_stop[2]      =
1679         vc->vc_tab_stop[3]      =
1680         vc->vc_tab_stop[4]      =
1681         vc->vc_tab_stop[5]      =
1682         vc->vc_tab_stop[6]      =
1683         vc->vc_tab_stop[7]      = 0x01010101;
1684
1685         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1686         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1687
1688         gotoxy(vc, 0, 0);
1689         save_cur(vc);
1690         if (do_clear)
1691             csi_J(vc, 2);
1692 }
1693
1694 /* console_lock is held */
1695 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1696 {
1697         /*
1698          *  Control characters can be used in the _middle_
1699          *  of an escape sequence.
1700          */
1701         switch (c) {
1702         case 0:
1703                 return;
1704         case 7:
1705                 if (vc->vc_bell_duration)
1706                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1707                 return;
1708         case 8:
1709                 bs(vc);
1710                 return;
1711         case 9:
1712                 vc->vc_pos -= (vc->vc_x << 1);
1713                 while (vc->vc_x < vc->vc_cols - 1) {
1714                         vc->vc_x++;
1715                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1716                                 break;
1717                 }
1718                 vc->vc_pos += (vc->vc_x << 1);
1719                 notify_write(vc, '\t');
1720                 return;
1721         case 10: case 11: case 12:
1722                 lf(vc);
1723                 if (!is_kbd(vc, lnm))
1724                         return;
1725         case 13:
1726                 cr(vc);
1727                 return;
1728         case 14:
1729                 vc->vc_charset = 1;
1730                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1731                 vc->vc_disp_ctrl = 1;
1732                 return;
1733         case 15:
1734                 vc->vc_charset = 0;
1735                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1736                 vc->vc_disp_ctrl = 0;
1737                 return;
1738         case 24: case 26:
1739                 vc->vc_state = ESnormal;
1740                 return;
1741         case 27:
1742                 vc->vc_state = ESesc;
1743                 return;
1744         case 127:
1745                 del(vc);
1746                 return;
1747         case 128+27:
1748                 vc->vc_state = ESsquare;
1749                 return;
1750         }
1751         switch(vc->vc_state) {
1752         case ESesc:
1753                 vc->vc_state = ESnormal;
1754                 switch (c) {
1755                 case '[':
1756                         vc->vc_state = ESsquare;
1757                         return;
1758                 case ']':
1759                         vc->vc_state = ESnonstd;
1760                         return;
1761                 case '%':
1762                         vc->vc_state = ESpercent;
1763                         return;
1764                 case 'E':
1765                         cr(vc);
1766                         lf(vc);
1767                         return;
1768                 case 'M':
1769                         ri(vc);
1770                         return;
1771                 case 'D':
1772                         lf(vc);
1773                         return;
1774                 case 'H':
1775                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1776                         return;
1777                 case 'Z':
1778                         respond_ID(tty);
1779                         return;
1780                 case '7':
1781                         save_cur(vc);
1782                         return;
1783                 case '8':
1784                         restore_cur(vc);
1785                         return;
1786                 case '(':
1787                         vc->vc_state = ESsetG0;
1788                         return;
1789                 case ')':
1790                         vc->vc_state = ESsetG1;
1791                         return;
1792                 case '#':
1793                         vc->vc_state = EShash;
1794                         return;
1795                 case 'c':
1796                         reset_terminal(vc, 1);
1797                         return;
1798                 case '>':  /* Numeric keypad */
1799                         clr_kbd(vc, kbdapplic);
1800                         return;
1801                 case '=':  /* Appl. keypad */
1802                         set_kbd(vc, kbdapplic);
1803                         return;
1804                 }
1805                 return;
1806         case ESnonstd:
1807                 if (c=='P') {   /* palette escape sequence */
1808                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1809                                 vc->vc_par[vc->vc_npar] = 0;
1810                         vc->vc_npar = 0;
1811                         vc->vc_state = ESpalette;
1812                         return;
1813                 } else if (c=='R') {   /* reset palette */
1814                         reset_palette(vc);
1815                         vc->vc_state = ESnormal;
1816                 } else
1817                         vc->vc_state = ESnormal;
1818                 return;
1819         case ESpalette:
1820                 if (isxdigit(c)) {
1821                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1822                         if (vc->vc_npar == 7) {
1823                                 int i = vc->vc_par[0] * 3, j = 1;
1824                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1825                                 vc->vc_palette[i++] += vc->vc_par[j++];
1826                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1827                                 vc->vc_palette[i++] += vc->vc_par[j++];
1828                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1829                                 vc->vc_palette[i] += vc->vc_par[j];
1830                                 set_palette(vc);
1831                                 vc->vc_state = ESnormal;
1832                         }
1833                 } else
1834                         vc->vc_state = ESnormal;
1835                 return;
1836         case ESsquare:
1837                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1838                         vc->vc_par[vc->vc_npar] = 0;
1839                 vc->vc_npar = 0;
1840                 vc->vc_state = ESgetpars;
1841                 if (c == '[') { /* Function key */
1842                         vc->vc_state=ESfunckey;
1843                         return;
1844                 }
1845                 vc->vc_ques = (c == '?');
1846                 if (vc->vc_ques)
1847                         return;
1848         case ESgetpars:
1849                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1850                         vc->vc_npar++;
1851                         return;
1852                 } else if (c>='0' && c<='9') {
1853                         vc->vc_par[vc->vc_npar] *= 10;
1854                         vc->vc_par[vc->vc_npar] += c - '0';
1855                         return;
1856                 } else
1857                         vc->vc_state = ESgotpars;
1858         case ESgotpars:
1859                 vc->vc_state = ESnormal;
1860                 switch(c) {
1861                 case 'h':
1862                         set_mode(vc, 1);
1863                         return;
1864                 case 'l':
1865                         set_mode(vc, 0);
1866                         return;
1867                 case 'c':
1868                         if (vc->vc_ques) {
1869                                 if (vc->vc_par[0])
1870                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1871                                 else
1872                                         vc->vc_cursor_type = cur_default;
1873                                 return;
1874                         }
1875                         break;
1876                 case 'm':
1877                         if (vc->vc_ques) {
1878                                 clear_selection();
1879                                 if (vc->vc_par[0])
1880                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1881                                 else
1882                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1883                                 return;
1884                         }
1885                         break;
1886                 case 'n':
1887                         if (!vc->vc_ques) {
1888                                 if (vc->vc_par[0] == 5)
1889                                         status_report(tty);
1890                                 else if (vc->vc_par[0] == 6)
1891                                         cursor_report(vc, tty);
1892                         }
1893                         return;
1894                 }
1895                 if (vc->vc_ques) {
1896                         vc->vc_ques = 0;
1897                         return;
1898                 }
1899                 switch(c) {
1900                 case 'G': case '`':
1901                         if (vc->vc_par[0])
1902                                 vc->vc_par[0]--;
1903                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1904                         return;
1905                 case 'A':
1906                         if (!vc->vc_par[0])
1907                                 vc->vc_par[0]++;
1908                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1909                         return;
1910                 case 'B': case 'e':
1911                         if (!vc->vc_par[0])
1912                                 vc->vc_par[0]++;
1913                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1914                         return;
1915                 case 'C': case 'a':
1916                         if (!vc->vc_par[0])
1917                                 vc->vc_par[0]++;
1918                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1919                         return;
1920                 case 'D':
1921                         if (!vc->vc_par[0])
1922                                 vc->vc_par[0]++;
1923                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1924                         return;
1925                 case 'E':
1926                         if (!vc->vc_par[0])
1927                                 vc->vc_par[0]++;
1928                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1929                         return;
1930                 case 'F':
1931                         if (!vc->vc_par[0])
1932                                 vc->vc_par[0]++;
1933                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1934                         return;
1935                 case 'd':
1936                         if (vc->vc_par[0])
1937                                 vc->vc_par[0]--;
1938                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1939                         return;
1940                 case 'H': case 'f':
1941                         if (vc->vc_par[0])
1942                                 vc->vc_par[0]--;
1943                         if (vc->vc_par[1])
1944                                 vc->vc_par[1]--;
1945                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1946                         return;
1947                 case 'J':
1948                         csi_J(vc, vc->vc_par[0]);
1949                         return;
1950                 case 'K':
1951                         csi_K(vc, vc->vc_par[0]);
1952                         return;
1953                 case 'L':
1954                         csi_L(vc, vc->vc_par[0]);
1955                         return;
1956                 case 'M':
1957                         csi_M(vc, vc->vc_par[0]);
1958                         return;
1959                 case 'P':
1960                         csi_P(vc, vc->vc_par[0]);
1961                         return;
1962                 case 'c':
1963                         if (!vc->vc_par[0])
1964                                 respond_ID(tty);
1965                         return;
1966                 case 'g':
1967                         if (!vc->vc_par[0])
1968                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1969                         else if (vc->vc_par[0] == 3) {
1970                                 vc->vc_tab_stop[0] =
1971                                         vc->vc_tab_stop[1] =
1972                                         vc->vc_tab_stop[2] =
1973                                         vc->vc_tab_stop[3] =
1974                                         vc->vc_tab_stop[4] =
1975                                         vc->vc_tab_stop[5] =
1976                                         vc->vc_tab_stop[6] =
1977                                         vc->vc_tab_stop[7] = 0;
1978                         }
1979                         return;
1980                 case 'm':
1981                         csi_m(vc);
1982                         return;
1983                 case 'q': /* DECLL - but only 3 leds */
1984                         /* map 0,1,2,3 to 0,1,2,4 */
1985                         if (vc->vc_par[0] < 4)
1986                                 setledstate(kbd_table + vc->vc_num,
1987                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1988                         return;
1989                 case 'r':
1990                         if (!vc->vc_par[0])
1991                                 vc->vc_par[0]++;
1992                         if (!vc->vc_par[1])
1993                                 vc->vc_par[1] = vc->vc_rows;
1994                         /* Minimum allowed region is 2 lines */
1995                         if (vc->vc_par[0] < vc->vc_par[1] &&
1996                             vc->vc_par[1] <= vc->vc_rows) {
1997                                 vc->vc_top = vc->vc_par[0] - 1;
1998                                 vc->vc_bottom = vc->vc_par[1];
1999                                 gotoxay(vc, 0, 0);
2000                         }
2001                         return;
2002                 case 's':
2003                         save_cur(vc);
2004                         return;
2005                 case 'u':
2006                         restore_cur(vc);
2007                         return;
2008                 case 'X':
2009                         csi_X(vc, vc->vc_par[0]);
2010                         return;
2011                 case '@':
2012                         csi_at(vc, vc->vc_par[0]);
2013                         return;
2014                 case ']': /* setterm functions */
2015                         setterm_command(vc);
2016                         return;
2017                 }
2018                 return;
2019         case ESpercent:
2020                 vc->vc_state = ESnormal;
2021                 switch (c) {
2022                 case '@':  /* defined in ISO 2022 */
2023                         vc->vc_utf = 0;
2024                         return;
2025                 case 'G':  /* prelim official escape code */
2026                 case '8':  /* retained for compatibility */
2027                         vc->vc_utf = 1;
2028                         return;
2029                 }
2030                 return;
2031         case ESfunckey:
2032                 vc->vc_state = ESnormal;
2033                 return;
2034         case EShash:
2035                 vc->vc_state = ESnormal;
2036                 if (c == '8') {
2037                         /* DEC screen alignment test. kludge :-) */
2038                         vc->vc_video_erase_char =
2039                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2040                         csi_J(vc, 2);
2041                         vc->vc_video_erase_char =
2042                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2043                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2044                 }
2045                 return;
2046         case ESsetG0:
2047                 if (c == '0')
2048                         vc->vc_G0_charset = GRAF_MAP;
2049                 else if (c == 'B')
2050                         vc->vc_G0_charset = LAT1_MAP;
2051                 else if (c == 'U')
2052                         vc->vc_G0_charset = IBMPC_MAP;
2053                 else if (c == 'K')
2054                         vc->vc_G0_charset = USER_MAP;
2055                 if (vc->vc_charset == 0)
2056                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2057                 vc->vc_state = ESnormal;
2058                 return;
2059         case ESsetG1:
2060                 if (c == '0')
2061                         vc->vc_G1_charset = GRAF_MAP;
2062                 else if (c == 'B')
2063                         vc->vc_G1_charset = LAT1_MAP;
2064                 else if (c == 'U')
2065                         vc->vc_G1_charset = IBMPC_MAP;
2066                 else if (c == 'K')
2067                         vc->vc_G1_charset = USER_MAP;
2068                 if (vc->vc_charset == 1)
2069                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2070                 vc->vc_state = ESnormal;
2071                 return;
2072         default:
2073                 vc->vc_state = ESnormal;
2074         }
2075 }
2076
2077 /* is_double_width() is based on the wcwidth() implementation by
2078  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2079  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2080  */
2081 struct interval {
2082         uint32_t first;
2083         uint32_t last;
2084 };
2085
2086 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2087 {
2088         int min = 0;
2089         int mid;
2090
2091         if (ucs < table[0].first || ucs > table[max].last)
2092                 return 0;
2093         while (max >= min) {
2094                 mid = (min + max) / 2;
2095                 if (ucs > table[mid].last)
2096                         min = mid + 1;
2097                 else if (ucs < table[mid].first)
2098                         max = mid - 1;
2099                 else
2100                         return 1;
2101         }
2102         return 0;
2103 }
2104
2105 static int is_double_width(uint32_t ucs)
2106 {
2107         static const struct interval double_width[] = {
2108                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2109                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2110                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2111                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2112         };
2113         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2114 }
2115
2116 /* acquires console_lock */
2117 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2118 {
2119 #ifdef VT_BUF_VRAM_ONLY
2120 #define FLUSH do { } while(0);
2121 #else
2122 #define FLUSH if (draw_x >= 0) { \
2123         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2124         draw_x = -1; \
2125         }
2126 #endif
2127
2128         int c, tc, ok, n = 0, draw_x = -1;
2129         unsigned int currcons;
2130         unsigned long draw_from = 0, draw_to = 0;
2131         struct vc_data *vc;
2132         unsigned char vc_attr;
2133         struct vt_notifier_param param;
2134         uint8_t rescan;
2135         uint8_t inverse;
2136         uint8_t width;
2137         u16 himask, charmask;
2138
2139         if (in_interrupt())
2140                 return count;
2141
2142         might_sleep();
2143
2144         console_lock();
2145         vc = tty->driver_data;
2146         if (vc == NULL) {
2147                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2148                 console_unlock();
2149                 return 0;
2150         }
2151
2152         currcons = vc->vc_num;
2153         if (!vc_cons_allocated(currcons)) {
2154                 /* could this happen? */
2155                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2156                 console_unlock();
2157                 return 0;
2158         }
2159
2160         himask = vc->vc_hi_font_mask;
2161         charmask = himask ? 0x1ff : 0xff;
2162
2163         /* undraw cursor first */
2164         if (IS_FG(vc))
2165                 hide_cursor(vc);
2166
2167         param.vc = vc;
2168
2169         while (!tty->stopped && count) {
2170                 int orig = *buf;
2171                 c = orig;
2172                 buf++;
2173                 n++;
2174                 count--;
2175                 rescan = 0;
2176                 inverse = 0;
2177                 width = 1;
2178
2179                 /* Do no translation at all in control states */
2180                 if (vc->vc_state != ESnormal) {
2181                         tc = c;
2182                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2183                     /* Combine UTF-8 into Unicode in vc_utf_char.
2184                      * vc_utf_count is the number of continuation bytes still
2185                      * expected to arrive.
2186                      * vc_npar is the number of continuation bytes arrived so
2187                      * far
2188                      */
2189 rescan_last_byte:
2190                     if ((c & 0xc0) == 0x80) {
2191                         /* Continuation byte received */
2192                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2193                         if (vc->vc_utf_count) {
2194                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2195                             vc->vc_npar++;
2196                             if (--vc->vc_utf_count) {
2197                                 /* Still need some bytes */
2198                                 continue;
2199                             }
2200                             /* Got a whole character */
2201                             c = vc->vc_utf_char;
2202                             /* Reject overlong sequences */
2203                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2204                                         c > utf8_length_changes[vc->vc_npar])
2205                                 c = 0xfffd;
2206                         } else {
2207                             /* Unexpected continuation byte */
2208                             vc->vc_utf_count = 0;
2209                             c = 0xfffd;
2210                         }
2211                     } else {
2212                         /* Single ASCII byte or first byte of a sequence received */
2213                         if (vc->vc_utf_count) {
2214                             /* Continuation byte expected */
2215                             rescan = 1;
2216                             vc->vc_utf_count = 0;
2217                             c = 0xfffd;
2218                         } else if (c > 0x7f) {
2219                             /* First byte of a multibyte sequence received */
2220                             vc->vc_npar = 0;
2221                             if ((c & 0xe0) == 0xc0) {
2222                                 vc->vc_utf_count = 1;
2223                                 vc->vc_utf_char = (c & 0x1f);
2224                             } else if ((c & 0xf0) == 0xe0) {
2225                                 vc->vc_utf_count = 2;
2226                                 vc->vc_utf_char = (c & 0x0f);
2227                             } else if ((c & 0xf8) == 0xf0) {
2228                                 vc->vc_utf_count = 3;
2229                                 vc->vc_utf_char = (c & 0x07);
2230                             } else if ((c & 0xfc) == 0xf8) {
2231                                 vc->vc_utf_count = 4;
2232                                 vc->vc_utf_char = (c & 0x03);
2233                             } else if ((c & 0xfe) == 0xfc) {
2234                                 vc->vc_utf_count = 5;
2235                                 vc->vc_utf_char = (c & 0x01);
2236                             } else {
2237                                 /* 254 and 255 are invalid */
2238                                 c = 0xfffd;
2239                             }
2240                             if (vc->vc_utf_count) {
2241                                 /* Still need some bytes */
2242                                 continue;
2243                             }
2244                         }
2245                         /* Nothing to do if an ASCII byte was received */
2246                     }
2247                     /* End of UTF-8 decoding. */
2248                     /* c is the received character, or U+FFFD for invalid sequences. */
2249                     /* Replace invalid Unicode code points with U+FFFD too */
2250                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2251                         c = 0xfffd;
2252                     tc = c;
2253                 } else {        /* no utf or alternate charset mode */
2254                     tc = vc_translate(vc, c);
2255                 }
2256
2257                 param.c = tc;
2258                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2259                                         &param) == NOTIFY_STOP)
2260                         continue;
2261
2262                 /* If the original code was a control character we
2263                  * only allow a glyph to be displayed if the code is
2264                  * not normally used (such as for cursor movement) or
2265                  * if the disp_ctrl mode has been explicitly enabled.
2266                  * Certain characters (as given by the CTRL_ALWAYS
2267                  * bitmap) are always displayed as control characters,
2268                  * as the console would be pretty useless without
2269                  * them; to display an arbitrary font position use the
2270                  * direct-to-font zone in UTF-8 mode.
2271                  */
2272                 ok = tc && (c >= 32 ||
2273                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2274                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2275                         && (c != 127 || vc->vc_disp_ctrl)
2276                         && (c != 128+27);
2277
2278                 if (vc->vc_state == ESnormal && ok) {
2279                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2280                                 if (is_double_width(c))
2281                                         width = 2;
2282                         }
2283                         /* Now try to find out how to display it */
2284                         tc = conv_uni_to_pc(vc, tc);
2285                         if (tc & ~charmask) {
2286                                 if (tc == -1 || tc == -2) {
2287                                     continue; /* nothing to display */
2288                                 }
2289                                 /* Glyph not found */
2290                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2291                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2292                                        This would make absolutely no sense with Unicode in mind,
2293                                        but do this for ASCII characters since a font may lack
2294                                        Unicode mapping info and we don't want to end up with
2295                                        having question marks only. */
2296                                     tc = c;
2297                                 } else {
2298                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2299                                     tc = conv_uni_to_pc(vc, 0xfffd);
2300                                     if (tc < 0) {
2301                                         inverse = 1;
2302                                         tc = conv_uni_to_pc(vc, '?');
2303                                         if (tc < 0) tc = '?';
2304                                     }
2305                                 }
2306                         }
2307
2308                         if (!inverse) {
2309                                 vc_attr = vc->vc_attr;
2310                         } else {
2311                                 /* invert vc_attr */
2312                                 if (!vc->vc_can_do_color) {
2313                                         vc_attr = (vc->vc_attr) ^ 0x08;
2314                                 } else if (vc->vc_hi_font_mask == 0x100) {
2315                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2316                                 } else {
2317                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2318                                 }
2319                                 FLUSH
2320                         }
2321
2322                         while (1) {
2323                                 if (vc->vc_need_wrap || vc->vc_decim)
2324                                         FLUSH
2325                                 if (vc->vc_need_wrap) {
2326                                         cr(vc);
2327                                         lf(vc);
2328                                 }
2329                                 if (vc->vc_decim)
2330                                         insert_char(vc, 1);
2331                                 scr_writew(himask ?
2332                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2333                                              (vc_attr << 8) + tc,
2334                                            (u16 *) vc->vc_pos);
2335                                 if (DO_UPDATE(vc) && draw_x < 0) {
2336                                         draw_x = vc->vc_x;
2337                                         draw_from = vc->vc_pos;
2338                                 }
2339                                 if (vc->vc_x == vc->vc_cols - 1) {
2340                                         vc->vc_need_wrap = vc->vc_decawm;
2341                                         draw_to = vc->vc_pos + 2;
2342                                 } else {
2343                                         vc->vc_x++;
2344                                         draw_to = (vc->vc_pos += 2);
2345                                 }
2346
2347                                 if (!--width) break;
2348
2349                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2350                                 if (tc < 0) tc = ' ';
2351                         }
2352                         notify_write(vc, c);
2353
2354                         if (inverse) {
2355                                 FLUSH
2356                         }
2357
2358                         if (rescan) {
2359                                 rescan = 0;
2360                                 inverse = 0;
2361                                 width = 1;
2362                                 c = orig;
2363                                 goto rescan_last_byte;
2364                         }
2365                         continue;
2366                 }
2367                 FLUSH
2368                 do_con_trol(tty, vc, orig);
2369         }
2370         FLUSH
2371         console_conditional_schedule();
2372         console_unlock();
2373         notify_update(vc);
2374         return n;
2375 #undef FLUSH
2376 }
2377
2378 /*
2379  * This is the console switching callback.
2380  *
2381  * Doing console switching in a process context allows
2382  * us to do the switches asynchronously (needed when we want
2383  * to switch due to a keyboard interrupt).  Synchronization
2384  * with other console code and prevention of re-entrancy is
2385  * ensured with console_lock.
2386  */
2387 static void console_callback(struct work_struct *ignored)
2388 {
2389         console_lock();
2390
2391         if (want_console >= 0) {
2392                 if (want_console != fg_console &&
2393                     vc_cons_allocated(want_console)) {
2394                         hide_cursor(vc_cons[fg_console].d);
2395                         change_console(vc_cons[want_console].d);
2396                         /* we only changed when the console had already
2397                            been allocated - a new console is not created
2398                            in an interrupt routine */
2399                 }
2400                 want_console = -1;
2401         }
2402         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2403                 do_poke_blanked_console = 0;
2404                 poke_blanked_console();
2405         }
2406         if (scrollback_delta) {
2407                 struct vc_data *vc = vc_cons[fg_console].d;
2408                 clear_selection();
2409                 if (vc->vc_mode == KD_TEXT)
2410                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2411                 scrollback_delta = 0;
2412         }
2413         if (blank_timer_expired) {
2414                 do_blank_screen(0);
2415                 blank_timer_expired = 0;
2416         }
2417         notify_update(vc_cons[fg_console].d);
2418
2419         console_unlock();
2420 }
2421
2422 int set_console(int nr)
2423 {
2424         struct vc_data *vc = vc_cons[fg_console].d;
2425
2426         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2427                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2428
2429                 /*
2430                  * Console switch will fail in console_callback() or
2431                  * change_console() so there is no point scheduling
2432                  * the callback
2433                  *
2434                  * Existing set_console() users don't check the return
2435                  * value so this shouldn't break anything
2436                  */
2437                 return -EINVAL;
2438         }
2439
2440         want_console = nr;
2441         schedule_console_callback();
2442
2443         return 0;
2444 }
2445
2446 struct tty_driver *console_driver;
2447
2448 #ifdef CONFIG_VT_CONSOLE
2449
2450 /**
2451  * vt_kmsg_redirect() - Sets/gets the kernel message console
2452  * @new:        The new virtual terminal number or -1 if the console should stay
2453  *              unchanged
2454  *
2455  * By default, the kernel messages are always printed on the current virtual
2456  * console. However, the user may modify that default with the
2457  * TIOCL_SETKMSGREDIRECT ioctl call.
2458  *
2459  * This function sets the kernel message console to be @new. It returns the old
2460  * virtual console number. The virtual terminal number 0 (both as parameter and
2461  * return value) means no redirection (i.e. always printed on the currently
2462  * active console).
2463  *
2464  * The parameter -1 means that only the current console is returned, but the
2465  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2466  * case to make the code more understandable.
2467  *
2468  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2469  * the parameter and always returns 0.
2470  */
2471 int vt_kmsg_redirect(int new)
2472 {
2473         static int kmsg_con;
2474
2475         if (new != -1)
2476                 return xchg(&kmsg_con, new);
2477         else
2478                 return kmsg_con;
2479 }
2480
2481 /*
2482  *      Console on virtual terminal
2483  *
2484  * The console must be locked when we get here.
2485  */
2486
2487 static void vt_console_print(struct console *co, const char *b, unsigned count)
2488 {
2489         struct vc_data *vc = vc_cons[fg_console].d;
2490         unsigned char c;
2491         static DEFINE_SPINLOCK(printing_lock);
2492         const ushort *start;
2493         ushort cnt = 0;
2494         ushort myx;
2495         int kmsg_console;
2496
2497         /* console busy or not yet initialized */
2498         if (!printable)
2499                 return;
2500         if (!spin_trylock(&printing_lock))
2501                 return;
2502
2503         kmsg_console = vt_get_kmsg_redirect();
2504         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2505                 vc = vc_cons[kmsg_console - 1].d;
2506
2507         /* read `x' only after setting currcons properly (otherwise
2508            the `x' macro will read the x of the foreground console). */
2509         myx = vc->vc_x;
2510
2511         if (!vc_cons_allocated(fg_console)) {
2512                 /* impossible */
2513                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2514                 goto quit;
2515         }
2516
2517         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2518                 goto quit;
2519
2520         /* undraw cursor first */
2521         if (IS_FG(vc))
2522                 hide_cursor(vc);
2523
2524         start = (ushort *)vc->vc_pos;
2525
2526         /* Contrived structure to try to emulate original need_wrap behaviour
2527          * Problems caused when we have need_wrap set on '\n' character */
2528         while (count--) {
2529                 c = *b++;
2530                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2531                         if (cnt > 0) {
2532                                 if (CON_IS_VISIBLE(vc))
2533                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2534                                 vc->vc_x += cnt;
2535                                 if (vc->vc_need_wrap)
2536                                         vc->vc_x--;
2537                                 cnt = 0;
2538                         }
2539                         if (c == 8) {           /* backspace */
2540                                 bs(vc);
2541                                 start = (ushort *)vc->vc_pos;
2542                                 myx = vc->vc_x;
2543                                 continue;
2544                         }
2545                         if (c != 13)
2546                                 lf(vc);
2547                         cr(vc);
2548                         start = (ushort *)vc->vc_pos;
2549                         myx = vc->vc_x;
2550                         if (c == 10 || c == 13)
2551                                 continue;
2552                 }
2553                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2554                 notify_write(vc, c);
2555                 cnt++;
2556                 if (myx == vc->vc_cols - 1) {
2557                         vc->vc_need_wrap = 1;
2558                         continue;
2559                 }
2560                 vc->vc_pos += 2;
2561                 myx++;
2562         }
2563         if (cnt > 0) {
2564                 if (CON_IS_VISIBLE(vc))
2565                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2566                 vc->vc_x += cnt;
2567                 if (vc->vc_x == vc->vc_cols) {
2568                         vc->vc_x--;
2569                         vc->vc_need_wrap = 1;
2570                 }
2571         }
2572         set_cursor(vc);
2573         notify_update(vc);
2574
2575 quit:
2576         spin_unlock(&printing_lock);
2577 }
2578
2579 static struct tty_driver *vt_console_device(struct console *c, int *index)
2580 {
2581         *index = c->index ? c->index-1 : fg_console;
2582         return console_driver;
2583 }
2584
2585 static struct console vt_console_driver = {
2586         .name           = "tty",
2587         .write          = vt_console_print,
2588         .device         = vt_console_device,
2589         .unblank        = unblank_screen,
2590         .flags          = CON_PRINTBUFFER,
2591         .index          = -1,
2592 };
2593 #endif
2594
2595 /*
2596  *      Handling of Linux-specific VC ioctls
2597  */
2598
2599 /*
2600  * Generally a bit racy with respect to console_lock();.
2601  *
2602  * There are some functions which don't need it.
2603  *
2604  * There are some functions which can sleep for arbitrary periods
2605  * (paste_selection) but we don't need the lock there anyway.
2606  *
2607  * set_selection has locking, and definitely needs it
2608  */
2609
2610 int tioclinux(struct tty_struct *tty, unsigned long arg)
2611 {
2612         char type, data;
2613         char __user *p = (char __user *)arg;
2614         int lines;
2615         int ret;
2616
2617         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2618                 return -EPERM;
2619         if (get_user(type, p))
2620                 return -EFAULT;
2621         ret = 0;
2622
2623         switch (type)
2624         {
2625                 case TIOCL_SETSEL:
2626                         console_lock();
2627                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2628                         console_unlock();
2629                         break;
2630                 case TIOCL_PASTESEL:
2631                         ret = paste_selection(tty);
2632                         break;
2633                 case TIOCL_UNBLANKSCREEN:
2634                         console_lock();
2635                         unblank_screen();
2636                         console_unlock();
2637                         break;
2638                 case TIOCL_SELLOADLUT:
2639                         ret = sel_loadlut(p);
2640                         break;
2641                 case TIOCL_GETSHIFTSTATE:
2642
2643         /*
2644          * Make it possible to react to Shift+Mousebutton.
2645          * Note that 'shift_state' is an undocumented
2646          * kernel-internal variable; programs not closely
2647          * related to the kernel should not use this.
2648          */
2649                         data = shift_state;
2650                         ret = __put_user(data, p);
2651                         break;
2652                 case TIOCL_GETMOUSEREPORTING:
2653                         data = mouse_reporting();
2654                         ret = __put_user(data, p);
2655                         break;
2656                 case TIOCL_SETVESABLANK:
2657                         ret = set_vesa_blanking(p);
2658                         break;
2659                 case TIOCL_GETKMSGREDIRECT:
2660                         data = vt_get_kmsg_redirect();
2661                         ret = __put_user(data, p);
2662                         break;
2663                 case TIOCL_SETKMSGREDIRECT:
2664                         if (!capable(CAP_SYS_ADMIN)) {
2665                                 ret = -EPERM;
2666                         } else {
2667                                 if (get_user(data, p+1))
2668                                         ret = -EFAULT;
2669                                 else
2670                                         vt_kmsg_redirect(data);
2671                         }
2672                         break;
2673                 case TIOCL_GETFGCONSOLE:
2674                         ret = fg_console;
2675                         break;
2676                 case TIOCL_SCROLLCONSOLE:
2677                         if (get_user(lines, (s32 __user *)(p+4))) {
2678                                 ret = -EFAULT;
2679                         } else {
2680                                 scrollfront(vc_cons[fg_console].d, lines);
2681                                 ret = 0;
2682                         }
2683                         break;
2684                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2685                         console_lock();
2686                         ignore_poke = 1;
2687                         do_blank_screen(0);
2688                         console_unlock();
2689                         break;
2690                 case TIOCL_BLANKEDSCREEN:
2691                         ret = console_blanked;
2692                         break;
2693                 default:
2694                         ret = -EINVAL;
2695                         break;
2696         }
2697         return ret;
2698 }
2699
2700 /*
2701  * /dev/ttyN handling
2702  */
2703
2704 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2705 {
2706         int     retval;
2707
2708         retval = do_con_write(tty, buf, count);
2709         con_flush_chars(tty);
2710
2711         return retval;
2712 }
2713
2714 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2715 {
2716         if (in_interrupt())
2717                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2718         return do_con_write(tty, &ch, 1);
2719 }
2720
2721 static int con_write_room(struct tty_struct *tty)
2722 {
2723         if (tty->stopped)
2724                 return 0;
2725         return 32768;           /* No limit, really; we're not buffering */
2726 }
2727
2728 static int con_chars_in_buffer(struct tty_struct *tty)
2729 {
2730         return 0;               /* we're not buffering */
2731 }
2732
2733 /*
2734  * con_throttle and con_unthrottle are only used for
2735  * paste_selection(), which has to stuff in a large number of
2736  * characters...
2737  */
2738 static void con_throttle(struct tty_struct *tty)
2739 {
2740 }
2741
2742 static void con_unthrottle(struct tty_struct *tty)
2743 {
2744         struct vc_data *vc = tty->driver_data;
2745
2746         wake_up_interruptible(&vc->paste_wait);
2747 }
2748
2749 /*
2750  * Turn the Scroll-Lock LED on when the tty is stopped
2751  */
2752 static void con_stop(struct tty_struct *tty)
2753 {
2754         int console_num;
2755         if (!tty)
2756                 return;
2757         console_num = tty->index;
2758         if (!vc_cons_allocated(console_num))
2759                 return;
2760         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2761         set_leds();
2762 }
2763
2764 /*
2765  * Turn the Scroll-Lock LED off when the console is started
2766  */
2767 static void con_start(struct tty_struct *tty)
2768 {
2769         int console_num;
2770         if (!tty)
2771                 return;
2772         console_num = tty->index;
2773         if (!vc_cons_allocated(console_num))
2774                 return;
2775         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2776         set_leds();
2777 }
2778
2779 static void con_flush_chars(struct tty_struct *tty)
2780 {
2781         struct vc_data *vc;
2782
2783         if (in_interrupt())     /* from flush_to_ldisc */
2784                 return;
2785
2786         /* if we race with con_close(), vt may be null */
2787         console_lock();
2788         vc = tty->driver_data;
2789         if (vc)
2790                 set_cursor(vc);
2791         console_unlock();
2792 }
2793
2794 /*
2795  * Allocate the console screen memory.
2796  */
2797 static int con_open(struct tty_struct *tty, struct file *filp)
2798 {
2799         unsigned int currcons = tty->index;
2800         int ret = 0;
2801
2802         console_lock();
2803         if (tty->driver_data == NULL) {
2804                 ret = vc_allocate(currcons);
2805                 if (ret == 0) {
2806                         struct vc_data *vc = vc_cons[currcons].d;
2807
2808                         /* Still being freed */
2809                         if (vc->port.tty) {
2810                                 console_unlock();
2811                                 return -ERESTARTSYS;
2812                         }
2813                         tty->driver_data = vc;
2814                         vc->port.tty = tty;
2815
2816                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2817                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2818                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2819                         }
2820                         if (vc->vc_utf)
2821                                 tty->termios->c_iflag |= IUTF8;
2822                         else
2823                                 tty->termios->c_iflag &= ~IUTF8;
2824                         console_unlock();
2825                         return ret;
2826                 }
2827         }
2828         console_unlock();
2829         return ret;
2830 }
2831
2832 static void con_close(struct tty_struct *tty, struct file *filp)
2833 {
2834         /* Nothing to do - we defer to shutdown */
2835 }
2836
2837 static void con_shutdown(struct tty_struct *tty)
2838 {
2839         struct vc_data *vc = tty->driver_data;
2840         BUG_ON(vc == NULL);
2841         console_lock();
2842         vc->port.tty = NULL;
2843         console_unlock();
2844         tty_shutdown(tty);
2845 }
2846
2847 static int default_italic_color    = 2; // green (ASCII)
2848 static int default_underline_color = 3; // cyan (ASCII)
2849 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2850 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2851
2852 static void vc_init(struct vc_data *vc, unsigned int rows,
2853                     unsigned int cols, int do_clear)
2854 {
2855         int j, k ;
2856
2857         vc->vc_cols = cols;
2858         vc->vc_rows = rows;
2859         vc->vc_size_row = cols << 1;
2860         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2861
2862         set_origin(vc);
2863         vc->vc_pos = vc->vc_origin;
2864         reset_vc(vc);
2865         for (j=k=0; j<16; j++) {
2866                 vc->vc_palette[k++] = default_red[j] ;
2867                 vc->vc_palette[k++] = default_grn[j] ;
2868                 vc->vc_palette[k++] = default_blu[j] ;
2869         }
2870         vc->vc_def_color       = 0x07;   /* white */
2871         vc->vc_ulcolor         = default_underline_color;
2872         vc->vc_itcolor         = default_italic_color;
2873         vc->vc_halfcolor       = 0x08;   /* grey */
2874         init_waitqueue_head(&vc->paste_wait);
2875         reset_terminal(vc, do_clear);
2876 }
2877
2878 /*
2879  * This routine initializes console interrupts, and does nothing
2880  * else. If you want the screen to clear, call tty_write with
2881  * the appropriate escape-sequence.
2882  */
2883
2884 static int __init con_init(void)
2885 {
2886         const char *display_desc = NULL;
2887         struct vc_data *vc;
2888         unsigned int currcons = 0, i;
2889
2890         console_lock();
2891
2892         if (conswitchp)
2893                 display_desc = conswitchp->con_startup();
2894         if (!display_desc) {
2895                 fg_console = 0;
2896                 console_unlock();
2897                 return 0;
2898         }
2899
2900         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2901                 struct con_driver *con_driver = &registered_con_driver[i];
2902
2903                 if (con_driver->con == NULL) {
2904                         con_driver->con = conswitchp;
2905                         con_driver->desc = display_desc;
2906                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2907                         con_driver->first = 0;
2908                         con_driver->last = MAX_NR_CONSOLES - 1;
2909                         break;
2910                 }
2911         }
2912
2913         for (i = 0; i < MAX_NR_CONSOLES; i++)
2914                 con_driver_map[i] = conswitchp;
2915
2916         if (blankinterval) {
2917                 blank_state = blank_normal_wait;
2918                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2919         }
2920
2921         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2922                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2923                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2924                 tty_port_init(&vc->port);
2925                 visual_init(vc, currcons, 1);
2926                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2927                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2928                         currcons || !vc->vc_sw->con_save_screen);
2929         }
2930         currcons = fg_console = 0;
2931         master_display_fg = vc = vc_cons[currcons].d;
2932         set_origin(vc);
2933         save_screen(vc);
2934         gotoxy(vc, vc->vc_x, vc->vc_y);
2935         csi_J(vc, 0);
2936         update_screen(vc);
2937         pr_info("Console: %s %s %dx%d",
2938                 vc->vc_can_do_color ? "colour" : "mono",
2939                 display_desc, vc->vc_cols, vc->vc_rows);
2940         printable = 1;
2941         printk("\n");
2942
2943         console_unlock();
2944
2945 #ifdef CONFIG_VT_CONSOLE
2946         register_console(&vt_console_driver);
2947 #endif
2948         return 0;
2949 }
2950 console_initcall(con_init);
2951
2952 static const struct tty_operations con_ops = {
2953         .open = con_open,
2954         .close = con_close,
2955         .write = con_write,
2956         .write_room = con_write_room,
2957         .put_char = con_put_char,
2958         .flush_chars = con_flush_chars,
2959         .chars_in_buffer = con_chars_in_buffer,
2960         .ioctl = vt_ioctl,
2961 #ifdef CONFIG_COMPAT
2962         .compat_ioctl = vt_compat_ioctl,
2963 #endif
2964         .stop = con_stop,
2965         .start = con_start,
2966         .throttle = con_throttle,
2967         .unthrottle = con_unthrottle,
2968         .resize = vt_resize,
2969         .shutdown = con_shutdown
2970 };
2971
2972 static struct cdev vc0_cdev;
2973
2974 static ssize_t show_tty_active(struct device *dev,
2975                                 struct device_attribute *attr, char *buf)
2976 {
2977         return sprintf(buf, "tty%d\n", fg_console + 1);
2978 }
2979 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2980
2981 int __init vty_init(const struct file_operations *console_fops)
2982 {
2983         cdev_init(&vc0_cdev, console_fops);
2984         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2985             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2986                 panic("Couldn't register /dev/tty0 driver\n");
2987         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2988         if (IS_ERR(tty0dev))
2989                 tty0dev = NULL;
2990         else
2991                 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2992
2993         vcs_init();
2994
2995         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2996         if (!console_driver)
2997                 panic("Couldn't allocate console driver\n");
2998         console_driver->owner = THIS_MODULE;
2999         console_driver->name = "tty";
3000         console_driver->name_base = 1;
3001         console_driver->major = TTY_MAJOR;
3002         console_driver->minor_start = 1;
3003         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3004         console_driver->init_termios = tty_std_termios;
3005         if (default_utf8)
3006                 console_driver->init_termios.c_iflag |= IUTF8;
3007         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3008         tty_set_operations(console_driver, &con_ops);
3009         if (tty_register_driver(console_driver))
3010                 panic("Couldn't register console driver\n");
3011         kbd_init();
3012         console_map_init();
3013 #ifdef CONFIG_MDA_CONSOLE
3014         mda_console_init();
3015 #endif
3016         return 0;
3017 }
3018
3019 #ifndef VT_SINGLE_DRIVER
3020
3021 static struct class *vtconsole_class;
3022
3023 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3024                            int deflt)
3025 {
3026         struct module *owner = csw->owner;
3027         const char *desc = NULL;
3028         struct con_driver *con_driver;
3029         int i, j = -1, k = -1, retval = -ENODEV;
3030
3031         if (!try_module_get(owner))
3032                 return -ENODEV;
3033
3034         WARN_CONSOLE_UNLOCKED();
3035
3036         /* check if driver is registered */
3037         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3038                 con_driver = &registered_con_driver[i];
3039
3040                 if (con_driver->con == csw) {
3041                         desc = con_driver->desc;
3042                         retval = 0;
3043                         break;
3044                 }
3045         }
3046
3047         if (retval)
3048                 goto err;
3049
3050         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3051                 csw->con_startup();
3052                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3053         }
3054
3055         if (deflt) {
3056                 if (conswitchp)
3057                         module_put(conswitchp->owner);
3058
3059                 __module_get(owner);
3060                 conswitchp = csw;
3061         }
3062
3063         first = max(first, con_driver->first);
3064         last = min(last, con_driver->last);
3065
3066         for (i = first; i <= last; i++) {
3067                 int old_was_color;
3068                 struct vc_data *vc = vc_cons[i].d;
3069
3070                 if (con_driver_map[i])
3071                         module_put(con_driver_map[i]->owner);
3072                 __module_get(owner);
3073                 con_driver_map[i] = csw;
3074
3075                 if (!vc || !vc->vc_sw)
3076                         continue;
3077
3078                 j = i;
3079
3080                 if (CON_IS_VISIBLE(vc)) {
3081                         k = i;
3082                         save_screen(vc);
3083                 }
3084
3085                 old_was_color = vc->vc_can_do_color;
3086                 vc->vc_sw->con_deinit(vc);
3087                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3088                 visual_init(vc, i, 0);
3089                 set_origin(vc);
3090                 update_attr(vc);
3091
3092                 /* If the console changed between mono <-> color, then
3093                  * the attributes in the screenbuf will be wrong.  The
3094                  * following resets all attributes to something sane.
3095                  */
3096                 if (old_was_color != vc->vc_can_do_color)
3097                         clear_buffer_attributes(vc);
3098         }
3099
3100         pr_info("Console: switching ");
3101         if (!deflt)
3102                 printk("consoles %d-%d ", first+1, last+1);
3103         if (j >= 0) {
3104                 struct vc_data *vc = vc_cons[j].d;
3105
3106                 printk("to %s %s %dx%d\n",
3107                        vc->vc_can_do_color ? "colour" : "mono",
3108                        desc, vc->vc_cols, vc->vc_rows);
3109
3110                 if (k >= 0) {
3111                         vc = vc_cons[k].d;
3112                         update_screen(vc);
3113                 }
3114         } else
3115                 printk("to %s\n", desc);
3116
3117         retval = 0;
3118 err:
3119         module_put(owner);
3120         return retval;
3121 };
3122
3123
3124 static int bind_con_driver(const struct consw *csw, int first, int last,
3125                            int deflt)
3126 {
3127         int ret;
3128
3129         console_lock();
3130         ret = do_bind_con_driver(csw, first, last, deflt);
3131         console_unlock();
3132         return ret;
3133 }
3134
3135 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3136 static int con_is_graphics(const struct consw *csw, int first, int last)
3137 {
3138         int i, retval = 0;
3139
3140         for (i = first; i <= last; i++) {
3141                 struct vc_data *vc = vc_cons[i].d;
3142
3143                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3144                         retval = 1;
3145                         break;
3146                 }
3147         }
3148
3149         return retval;
3150 }
3151
3152 /**
3153  * unbind_con_driver - unbind a console driver
3154  * @csw: pointer to console driver to unregister
3155  * @first: first in range of consoles that @csw should be unbound from
3156  * @last: last in range of consoles that @csw should be unbound from
3157  * @deflt: should next bound console driver be default after @csw is unbound?
3158  *
3159  * To unbind a driver from all possible consoles, pass 0 as @first and
3160  * %MAX_NR_CONSOLES as @last.
3161  *
3162  * @deflt controls whether the console that ends up replacing @csw should be
3163  * the default console.
3164  *
3165  * RETURNS:
3166  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3167  * or 0 on success.
3168  */
3169 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3170 {
3171         int retval;
3172
3173         console_lock();
3174         retval = do_unbind_con_driver(csw, first, last, deflt);
3175         console_unlock();
3176         return retval;
3177 }
3178 EXPORT_SYMBOL(unbind_con_driver);
3179
3180 /* unlocked version of unbind_con_driver() */
3181 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3182 {
3183         struct module *owner = csw->owner;
3184         const struct consw *defcsw = NULL;
3185         struct con_driver *con_driver = NULL, *con_back = NULL;
3186         int i, retval = -ENODEV;
3187
3188         if (!try_module_get(owner))
3189                 return -ENODEV;
3190
3191         WARN_CONSOLE_UNLOCKED();
3192
3193         /* check if driver is registered and if it is unbindable */
3194         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3195                 con_driver = &registered_con_driver[i];
3196
3197                 if (con_driver->con == csw &&
3198                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3199                         retval = 0;
3200                         break;
3201                 }
3202         }
3203
3204         if (retval)
3205                 goto err;
3206
3207         retval = -ENODEV;
3208
3209         /* check if backup driver exists */
3210         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3211                 con_back = &registered_con_driver[i];
3212
3213                 if (con_back->con &&
3214                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3215                         defcsw = con_back->con;
3216                         retval = 0;
3217                         break;
3218                 }
3219         }
3220
3221         if (retval)
3222                 goto err;
3223
3224         if (!con_is_bound(csw))
3225                 goto err;
3226
3227         first = max(first, con_driver->first);
3228         last = min(last, con_driver->last);
3229
3230         for (i = first; i <= last; i++) {
3231                 if (con_driver_map[i] == csw) {
3232                         module_put(csw->owner);
3233                         con_driver_map[i] = NULL;
3234                 }
3235         }
3236
3237         if (!con_is_bound(defcsw)) {
3238                 const struct consw *defconsw = conswitchp;
3239
3240                 defcsw->con_startup();
3241                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3242                 /*
3243                  * vgacon may change the default driver to point
3244                  * to dummycon, we restore it here...
3245                  */
3246                 conswitchp = defconsw;
3247         }
3248
3249         if (!con_is_bound(csw))
3250                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3251
3252         /* ignore return value, binding should not fail */
3253         do_bind_con_driver(defcsw, first, last, deflt);
3254 err:
3255         module_put(owner);
3256         return retval;
3257
3258 }
3259 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3260
3261 static int vt_bind(struct con_driver *con)
3262 {
3263         const struct consw *defcsw = NULL, *csw = NULL;
3264         int i, more = 1, first = -1, last = -1, deflt = 0;
3265
3266         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3267             con_is_graphics(con->con, con->first, con->last))
3268                 goto err;
3269
3270         csw = con->con;
3271
3272         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3273                 struct con_driver *con = &registered_con_driver[i];
3274
3275                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3276                         defcsw = con->con;
3277                         break;
3278                 }
3279         }
3280
3281         if (!defcsw)
3282                 goto err;
3283
3284         while (more) {
3285                 more = 0;
3286
3287                 for (i = con->first; i <= con->last; i++) {
3288                         if (con_driver_map[i] == defcsw) {
3289                                 if (first == -1)
3290                                         first = i;
3291                                 last = i;
3292                                 more = 1;
3293                         } else if (first != -1)
3294                                 break;
3295                 }
3296
3297                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3298                         deflt = 1;
3299
3300                 if (first != -1)
3301                         bind_con_driver(csw, first, last, deflt);
3302
3303                 first = -1;
3304                 last = -1;
3305                 deflt = 0;
3306         }
3307
3308 err:
3309         return 0;
3310 }
3311
3312 static int vt_unbind(struct con_driver *con)
3313 {
3314         const struct consw *csw = NULL;
3315         int i, more = 1, first = -1, last = -1, deflt = 0;
3316
3317         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3318             con_is_graphics(con->con, con->first, con->last))
3319                 goto err;
3320
3321         csw = con->con;
3322
3323         while (more) {
3324                 more = 0;
3325
3326                 for (i = con->first; i <= con->last; i++) {
3327                         if (con_driver_map[i] == csw) {
3328                                 if (first == -1)
3329                                         first = i;
3330                                 last = i;
3331                                 more = 1;
3332                         } else if (first != -1)
3333                                 break;
3334                 }
3335
3336                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3337                         deflt = 1;
3338
3339                 if (first != -1)
3340                         unbind_con_driver(csw, first, last, deflt);
3341
3342                 first = -1;
3343                 last = -1;
3344                 deflt = 0;
3345         }
3346
3347 err:
3348         return 0;
3349 }
3350 #else
3351 static inline int vt_bind(struct con_driver *con)
3352 {
3353         return 0;
3354 }
3355 static inline int vt_unbind(struct con_driver *con)
3356 {
3357         return 0;
3358 }
3359 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3360
3361 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3362                           const char *buf, size_t count)
3363 {
3364         struct con_driver *con = dev_get_drvdata(dev);
3365         int bind = simple_strtoul(buf, NULL, 0);
3366
3367         if (bind)
3368                 vt_bind(con);
3369         else
3370                 vt_unbind(con);
3371
3372         return count;
3373 }
3374
3375 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3376                          char *buf)
3377 {
3378         struct con_driver *con = dev_get_drvdata(dev);
3379         int bind = con_is_bound(con->con);
3380
3381         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3382 }
3383
3384 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3385                          char *buf)
3386 {
3387         struct con_driver *con = dev_get_drvdata(dev);
3388
3389         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3390                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3391                          con->desc);
3392
3393 }
3394
3395 static struct device_attribute device_attrs[] = {
3396         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3397         __ATTR(name, S_IRUGO, show_name, NULL),
3398 };
3399
3400 static int vtconsole_init_device(struct con_driver *con)
3401 {
3402         int i;
3403         int error = 0;
3404
3405         con->flag |= CON_DRIVER_FLAG_ATTR;
3406         dev_set_drvdata(con->dev, con);
3407         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3408                 error = device_create_file(con->dev, &device_attrs[i]);
3409                 if (error)
3410                         break;
3411         }
3412
3413         if (error) {
3414                 while (--i >= 0)
3415                         device_remove_file(con->dev, &device_attrs[i]);
3416                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3417         }
3418
3419         return error;
3420 }
3421
3422 static void vtconsole_deinit_device(struct con_driver *con)
3423 {
3424         int i;
3425
3426         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3427                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3428                         device_remove_file(con->dev, &device_attrs[i]);
3429                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3430         }
3431 }
3432
3433 /**
3434  * con_is_bound - checks if driver is bound to the console
3435  * @csw: console driver
3436  *
3437  * RETURNS: zero if unbound, nonzero if bound
3438  *
3439  * Drivers can call this and if zero, they should release
3440  * all resources allocated on con_startup()
3441  */
3442 int con_is_bound(const struct consw *csw)
3443 {
3444         int i, bound = 0;
3445
3446         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3447                 if (con_driver_map[i] == csw) {
3448                         bound = 1;
3449                         break;
3450                 }
3451         }
3452
3453         return bound;
3454 }
3455 EXPORT_SYMBOL(con_is_bound);
3456
3457 /**
3458  * con_debug_enter - prepare the console for the kernel debugger
3459  * @sw: console driver
3460  *
3461  * Called when the console is taken over by the kernel debugger, this
3462  * function needs to save the current console state, then put the console
3463  * into a state suitable for the kernel debugger.
3464  *
3465  * RETURNS:
3466  * Zero on success, nonzero if a failure occurred when trying to prepare
3467  * the console for the debugger.
3468  */
3469 int con_debug_enter(struct vc_data *vc)
3470 {
3471         int ret = 0;
3472
3473         saved_fg_console = fg_console;
3474         saved_last_console = last_console;
3475         saved_want_console = want_console;
3476         saved_vc_mode = vc->vc_mode;
3477         saved_console_blanked = console_blanked;
3478         vc->vc_mode = KD_TEXT;
3479         console_blanked = 0;
3480         if (vc->vc_sw->con_debug_enter)
3481                 ret = vc->vc_sw->con_debug_enter(vc);
3482 #ifdef CONFIG_KGDB_KDB
3483         /* Set the initial LINES variable if it is not already set */
3484         if (vc->vc_rows < 999) {
3485                 int linecount;
3486                 char lns[4];
3487                 const char *setargs[3] = {
3488                         "set",
3489                         "LINES",
3490                         lns,
3491                 };
3492                 if (kdbgetintenv(setargs[0], &linecount)) {
3493                         snprintf(lns, 4, "%i", vc->vc_rows);
3494                         kdb_set(2, setargs);
3495                 }
3496         }
3497 #endif /* CONFIG_KGDB_KDB */
3498         return ret;
3499 }
3500 EXPORT_SYMBOL_GPL(con_debug_enter);
3501
3502 /**
3503  * con_debug_leave - restore console state
3504  * @sw: console driver
3505  *
3506  * Restore the console state to what it was before the kernel debugger
3507  * was invoked.
3508  *
3509  * RETURNS:
3510  * Zero on success, nonzero if a failure occurred when trying to restore
3511  * the console.
3512  */
3513 int con_debug_leave(void)
3514 {
3515         struct vc_data *vc;
3516         int ret = 0;
3517
3518         fg_console = saved_fg_console;
3519         last_console = saved_last_console;
3520         want_console = saved_want_console;
3521         console_blanked = saved_console_blanked;
3522         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3523
3524         vc = vc_cons[fg_console].d;
3525         if (vc->vc_sw->con_debug_leave)
3526                 ret = vc->vc_sw->con_debug_leave(vc);
3527         return ret;
3528 }
3529 EXPORT_SYMBOL_GPL(con_debug_leave);
3530
3531 static int do_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         WARN_CONSOLE_UNLOCKED();
3539
3540         if (!try_module_get(owner))
3541                 return -ENODEV;
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 = -EBUSY;
3549         }
3550
3551         if (retval)
3552                 goto err;
3553
3554         desc = csw->con_startup();
3555         if (!desc) {
3556                 retval = -ENODEV;
3557                 goto err;
3558         }
3559
3560         retval = -EINVAL;
3561
3562         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3563                 con_driver = &registered_con_driver[i];
3564
3565                 if (con_driver->con == NULL) {
3566                         con_driver->con = csw;
3567                         con_driver->desc = desc;
3568                         con_driver->node = i;
3569                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3570                                            CON_DRIVER_FLAG_INIT;
3571                         con_driver->first = first;
3572                         con_driver->last = last;
3573                         retval = 0;
3574                         break;
3575                 }
3576         }
3577
3578         if (retval)
3579                 goto err;
3580
3581         con_driver->dev = device_create(vtconsole_class, NULL,
3582                                                 MKDEV(0, con_driver->node),
3583                                                 NULL, "vtcon%i",
3584                                                 con_driver->node);
3585
3586         if (IS_ERR(con_driver->dev)) {
3587                 printk(KERN_WARNING "Unable to create device for %s; "
3588                        "errno = %ld\n", con_driver->desc,
3589                        PTR_ERR(con_driver->dev));
3590                 con_driver->dev = NULL;
3591         } else {
3592                 vtconsole_init_device(con_driver);
3593         }
3594
3595 err:
3596         module_put(owner);
3597         return retval;
3598 }
3599
3600 /**
3601  * register_con_driver - register console driver to console layer
3602  * @csw: console driver
3603  * @first: the first console to take over, minimum value is 0
3604  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3605  *
3606  * DESCRIPTION: This function registers a console driver which can later
3607  * bind to a range of consoles specified by @first and @last. It will
3608  * also initialize the console driver by calling con_startup().
3609  */
3610 int register_con_driver(const struct consw *csw, int first, int last)
3611 {
3612         int retval;
3613
3614         console_lock();
3615         retval = do_register_con_driver(csw, first, last);
3616         console_unlock();
3617         return retval;
3618 }
3619 EXPORT_SYMBOL(register_con_driver);
3620
3621 /**
3622  * unregister_con_driver - unregister console driver from console layer
3623  * @csw: console driver
3624  *
3625  * DESCRIPTION: All drivers that registers to the console layer must
3626  * call this function upon exit, or if the console driver is in a state
3627  * where it won't be able to handle console services, such as the
3628  * framebuffer console without loaded framebuffer drivers.
3629  *
3630  * The driver must unbind first prior to unregistration.
3631  */
3632 int unregister_con_driver(const struct consw *csw)
3633 {
3634         int retval;
3635
3636         console_lock();
3637         retval = do_unregister_con_driver(csw);
3638         console_unlock();
3639         return retval;
3640 }
3641 EXPORT_SYMBOL(unregister_con_driver);
3642
3643 int do_unregister_con_driver(const struct consw *csw)
3644 {
3645         int i, retval = -ENODEV;
3646
3647         /* cannot unregister a bound driver */
3648         if (con_is_bound(csw))
3649                 goto err;
3650
3651         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3652                 struct con_driver *con_driver = &registered_con_driver[i];
3653
3654                 if (con_driver->con == csw &&
3655                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3656                         vtconsole_deinit_device(con_driver);
3657                         device_destroy(vtconsole_class,
3658                                        MKDEV(0, con_driver->node));
3659                         con_driver->con = NULL;
3660                         con_driver->desc = NULL;
3661                         con_driver->dev = NULL;
3662                         con_driver->node = 0;
3663                         con_driver->flag = 0;
3664                         con_driver->first = 0;
3665                         con_driver->last = 0;
3666                         retval = 0;
3667                         break;
3668                 }
3669         }
3670 err:
3671         return retval;
3672 }
3673 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3674
3675 /*
3676  *      If we support more console drivers, this function is used
3677  *      when a driver wants to take over some existing consoles
3678  *      and become default driver for newly opened ones.
3679  *
3680  *      take_over_console is basically a register followed by unbind
3681  */
3682 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3683 {
3684         int err;
3685
3686         err = do_register_con_driver(csw, first, last);
3687         /*
3688          * If we get an busy error we still want to bind the console driver
3689          * and return success, as we may have unbound the console driver
3690          * but not unregistered it.
3691          */
3692         if (err == -EBUSY)
3693                 err = 0;
3694         if (!err)
3695                 do_bind_con_driver(csw, first, last, deflt);
3696
3697         return err;
3698 }
3699 EXPORT_SYMBOL_GPL(do_take_over_console);
3700
3701 /*
3702  *      If we support more console drivers, this function is used
3703  *      when a driver wants to take over some existing consoles
3704  *      and become default driver for newly opened ones.
3705  *
3706  *      take_over_console is basically a register followed by unbind
3707  */
3708 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3709 {
3710         int err;
3711
3712         err = register_con_driver(csw, first, last);
3713         /*
3714          * If we get an busy error we still want to bind the console driver
3715          * and return success, as we may have unbound the console driver
3716          * but not unregistered it.
3717          */
3718         if (err == -EBUSY)
3719                 err = 0;
3720         if (!err)
3721                 bind_con_driver(csw, first, last, deflt);
3722
3723         return err;
3724 }
3725
3726 /*
3727  * give_up_console is a wrapper to unregister_con_driver. It will only
3728  * work if driver is fully unbound.
3729  */
3730 void give_up_console(const struct consw *csw)
3731 {
3732         unregister_con_driver(csw);
3733 }
3734
3735 static int __init vtconsole_class_init(void)
3736 {
3737         int i;
3738
3739         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3740         if (IS_ERR(vtconsole_class)) {
3741                 printk(KERN_WARNING "Unable to create vt console class; "
3742                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3743                 vtconsole_class = NULL;
3744         }
3745
3746         /* Add system drivers to sysfs */
3747         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3748                 struct con_driver *con = &registered_con_driver[i];
3749
3750                 if (con->con && !con->dev) {
3751                         con->dev = device_create(vtconsole_class, NULL,
3752                                                          MKDEV(0, con->node),
3753                                                          NULL, "vtcon%i",
3754                                                          con->node);
3755
3756                         if (IS_ERR(con->dev)) {
3757                                 printk(KERN_WARNING "Unable to create "
3758                                        "device for %s; errno = %ld\n",
3759                                        con->desc, PTR_ERR(con->dev));
3760                                 con->dev = NULL;
3761                         } else {
3762                                 vtconsole_init_device(con);
3763                         }
3764                 }
3765         }
3766
3767         return 0;
3768 }
3769 postcore_initcall(vtconsole_class_init);
3770
3771 #endif
3772
3773 /*
3774  *      Screen blanking
3775  */
3776
3777 static int set_vesa_blanking(char __user *p)
3778 {
3779         unsigned int mode;
3780
3781         if (get_user(mode, p + 1))
3782                 return -EFAULT;
3783
3784         vesa_blank_mode = (mode < 4) ? mode : 0;
3785         return 0;
3786 }
3787
3788 void do_blank_screen(int entering_gfx)
3789 {
3790         struct vc_data *vc = vc_cons[fg_console].d;
3791         int i;
3792
3793         WARN_CONSOLE_UNLOCKED();
3794
3795         if (console_blanked) {
3796                 if (blank_state == blank_vesa_wait) {
3797                         blank_state = blank_off;
3798                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3799                 }
3800                 return;
3801         }
3802
3803         /* entering graphics mode? */
3804         if (entering_gfx) {
3805                 hide_cursor(vc);
3806                 save_screen(vc);
3807                 vc->vc_sw->con_blank(vc, -1, 1);
3808                 console_blanked = fg_console + 1;
3809                 blank_state = blank_off;
3810                 set_origin(vc);
3811                 return;
3812         }
3813
3814         if (blank_state != blank_normal_wait)
3815                 return;
3816         blank_state = blank_off;
3817
3818         /* don't blank graphics */
3819         if (vc->vc_mode != KD_TEXT) {
3820                 console_blanked = fg_console + 1;
3821                 return;
3822         }
3823
3824         hide_cursor(vc);
3825         del_timer_sync(&console_timer);
3826         blank_timer_expired = 0;
3827
3828         save_screen(vc);
3829         /* In case we need to reset origin, blanking hook returns 1 */
3830         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3831         console_blanked = fg_console + 1;
3832         if (i)
3833                 set_origin(vc);
3834
3835         if (console_blank_hook && console_blank_hook(1))
3836                 return;
3837
3838         if (vesa_off_interval && vesa_blank_mode) {
3839                 blank_state = blank_vesa_wait;
3840                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3841         }
3842         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3843 }
3844 EXPORT_SYMBOL(do_blank_screen);
3845
3846 /*
3847  * Called by timer as well as from vt_console_driver
3848  */
3849 void do_unblank_screen(int leaving_gfx)
3850 {
3851         struct vc_data *vc;
3852
3853         /* This should now always be called from a "sane" (read: can schedule)
3854          * context for the sake of the low level drivers, except in the special
3855          * case of oops_in_progress
3856          */
3857         if (!oops_in_progress)
3858                 might_sleep();
3859
3860         WARN_CONSOLE_UNLOCKED();
3861
3862         ignore_poke = 0;
3863         if (!console_blanked)
3864                 return;
3865         if (!vc_cons_allocated(fg_console)) {
3866                 /* impossible */
3867                 pr_warning("unblank_screen: tty %d not allocated ??\n",
3868                            fg_console+1);
3869                 return;
3870         }
3871         vc = vc_cons[fg_console].d;
3872         /* Try to unblank in oops case too */
3873         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3874                 return; /* but leave console_blanked != 0 */
3875
3876         if (blankinterval) {
3877                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3878                 blank_state = blank_normal_wait;
3879         }
3880
3881         console_blanked = 0;
3882         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3883                 /* Low-level driver cannot restore -> do it ourselves */
3884                 update_screen(vc);
3885         if (console_blank_hook)
3886                 console_blank_hook(0);
3887         set_palette(vc);
3888         set_cursor(vc);
3889         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3890 }
3891 EXPORT_SYMBOL(do_unblank_screen);
3892
3893 /*
3894  * This is called by the outside world to cause a forced unblank, mostly for
3895  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3896  * call it with 1 as an argument and so force a mode restore... that may kill
3897  * X or at least garbage the screen but would also make the Oops visible...
3898  */
3899 void unblank_screen(void)
3900 {
3901         do_unblank_screen(0);
3902 }
3903
3904 /*
3905  * We defer the timer blanking to work queue so it can take the console mutex
3906  * (console operations can still happen at irq time, but only from printk which
3907  * has the console mutex. Not perfect yet, but better than no locking
3908  */
3909 static void blank_screen_t(unsigned long dummy)
3910 {
3911         if (unlikely(!keventd_up())) {
3912                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3913                 return;
3914         }
3915         blank_timer_expired = 1;
3916         schedule_work(&console_work);
3917 }
3918
3919 void poke_blanked_console(void)
3920 {
3921         WARN_CONSOLE_UNLOCKED();
3922
3923         /* Add this so we quickly catch whoever might call us in a non
3924          * safe context. Nowadays, unblank_screen() isn't to be called in
3925          * atomic contexts and is allowed to schedule (with the special case
3926          * of oops_in_progress, but that isn't of any concern for this
3927          * function. --BenH.
3928          */
3929         might_sleep();
3930
3931         /* This isn't perfectly race free, but a race here would be mostly harmless,
3932          * at worse, we'll do a spurrious blank and it's unlikely
3933          */
3934         del_timer(&console_timer);
3935         blank_timer_expired = 0;
3936
3937         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3938                 return;
3939         if (console_blanked)
3940                 unblank_screen();
3941         else if (blankinterval) {
3942                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3943                 blank_state = blank_normal_wait;
3944         }
3945 }
3946
3947 /*
3948  *      Palettes
3949  */
3950
3951 static void set_palette(struct vc_data *vc)
3952 {
3953         WARN_CONSOLE_UNLOCKED();
3954
3955         if (vc->vc_mode != KD_GRAPHICS)
3956                 vc->vc_sw->con_set_palette(vc, color_table);
3957 }
3958
3959 static int set_get_cmap(unsigned char __user *arg, int set)
3960 {
3961     int i, j, k;
3962
3963     WARN_CONSOLE_UNLOCKED();
3964
3965     for (i = 0; i < 16; i++)
3966         if (set) {
3967             get_user(default_red[i], arg++);
3968             get_user(default_grn[i], arg++);
3969             get_user(default_blu[i], arg++);
3970         } else {
3971             put_user(default_red[i], arg++);
3972             put_user(default_grn[i], arg++);
3973             put_user(default_blu[i], arg++);
3974         }
3975     if (set) {
3976         for (i = 0; i < MAX_NR_CONSOLES; i++)
3977             if (vc_cons_allocated(i)) {
3978                 for (j = k = 0; j < 16; j++) {
3979                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3980                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3981                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3982                 }
3983                 set_palette(vc_cons[i].d);
3984             }
3985     }
3986     return 0;
3987 }
3988
3989 /*
3990  * Load palette into the DAC registers. arg points to a colour
3991  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3992  */
3993
3994 int con_set_cmap(unsigned char __user *arg)
3995 {
3996         int rc;
3997
3998         console_lock();
3999         rc = set_get_cmap (arg,1);
4000         console_unlock();
4001
4002         return rc;
4003 }
4004
4005 int con_get_cmap(unsigned char __user *arg)
4006 {
4007         int rc;
4008
4009         console_lock();
4010         rc = set_get_cmap (arg,0);
4011         console_unlock();
4012
4013         return rc;
4014 }
4015
4016 void reset_palette(struct vc_data *vc)
4017 {
4018         int j, k;
4019         for (j=k=0; j<16; j++) {
4020                 vc->vc_palette[k++] = default_red[j];
4021                 vc->vc_palette[k++] = default_grn[j];
4022                 vc->vc_palette[k++] = default_blu[j];
4023         }
4024         set_palette(vc);
4025 }
4026
4027 /*
4028  *  Font switching
4029  *
4030  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4031  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4032  *  depending on width) reserved for each character which is kinda wasty, but
4033  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4034  *  is up to the actual low-level console-driver convert data into its favorite
4035  *  format (maybe we should add a `fontoffset' field to the `display'
4036  *  structure so we won't have to convert the fontdata all the time.
4037  *  /Jes
4038  */
4039
4040 #define max_font_size 65536
4041
4042 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4043 {
4044         struct console_font font;
4045         int rc = -EINVAL;
4046         int c;
4047
4048         if (vc->vc_mode != KD_TEXT)
4049                 return -EINVAL;
4050
4051         if (op->data) {
4052                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4053                 if (!font.data)
4054                         return -ENOMEM;
4055         } else
4056                 font.data = NULL;
4057
4058         console_lock();
4059         if (vc->vc_sw->con_font_get)
4060                 rc = vc->vc_sw->con_font_get(vc, &font);
4061         else
4062                 rc = -ENOSYS;
4063         console_unlock();
4064
4065         if (rc)
4066                 goto out;
4067
4068         c = (font.width+7)/8 * 32 * font.charcount;
4069
4070         if (op->data && font.charcount > op->charcount)
4071                 rc = -ENOSPC;
4072         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4073                 if (font.width > op->width || font.height > op->height)
4074                         rc = -ENOSPC;
4075         } else {
4076                 if (font.width != 8)
4077                         rc = -EIO;
4078                 else if ((op->height && font.height > op->height) ||
4079                          font.height > 32)
4080                         rc = -ENOSPC;
4081         }
4082         if (rc)
4083                 goto out;
4084
4085         op->height = font.height;
4086         op->width = font.width;
4087         op->charcount = font.charcount;
4088
4089         if (op->data && copy_to_user(op->data, font.data, c))
4090                 rc = -EFAULT;
4091
4092 out:
4093         kfree(font.data);
4094         return rc;
4095 }
4096
4097 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4098 {
4099         struct console_font font;
4100         int rc = -EINVAL;
4101         int size;
4102
4103         if (vc->vc_mode != KD_TEXT)
4104                 return -EINVAL;
4105         if (!op->data)
4106                 return -EINVAL;
4107         if (op->charcount > 512)
4108                 return -EINVAL;
4109         if (!op->height) {              /* Need to guess font height [compat] */
4110                 int h, i;
4111                 u8 __user *charmap = op->data;
4112                 u8 tmp;
4113
4114                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4115                    so that we can get rid of this soon */
4116                 if (!(op->flags & KD_FONT_FLAG_OLD))
4117                         return -EINVAL;
4118                 for (h = 32; h > 0; h--)
4119                         for (i = 0; i < op->charcount; i++) {
4120                                 if (get_user(tmp, &charmap[32*i+h-1]))
4121                                         return -EFAULT;
4122                                 if (tmp)
4123                                         goto nonzero;
4124                         }
4125                 return -EINVAL;
4126         nonzero:
4127                 op->height = h;
4128         }
4129         if (op->width <= 0 || op->width > 32 || op->height > 32)
4130                 return -EINVAL;
4131         size = (op->width+7)/8 * 32 * op->charcount;
4132         if (size > max_font_size)
4133                 return -ENOSPC;
4134         font.charcount = op->charcount;
4135         font.height = op->height;
4136         font.width = op->width;
4137         font.data = memdup_user(op->data, size);
4138         if (IS_ERR(font.data))
4139                 return PTR_ERR(font.data);
4140         console_lock();
4141         if (vc->vc_sw->con_font_set)
4142                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4143         else
4144                 rc = -ENOSYS;
4145         console_unlock();
4146         kfree(font.data);
4147         return rc;
4148 }
4149
4150 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4151 {
4152         struct console_font font = {.width = op->width, .height = op->height};
4153         char name[MAX_FONT_NAME];
4154         char *s = name;
4155         int rc;
4156
4157         if (vc->vc_mode != KD_TEXT)
4158                 return -EINVAL;
4159
4160         if (!op->data)
4161                 s = NULL;
4162         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4163                 return -EFAULT;
4164         else
4165                 name[MAX_FONT_NAME - 1] = 0;
4166
4167         console_lock();
4168         if (vc->vc_sw->con_font_default)
4169                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4170         else
4171                 rc = -ENOSYS;
4172         console_unlock();
4173         if (!rc) {
4174                 op->width = font.width;
4175                 op->height = font.height;
4176         }
4177         return rc;
4178 }
4179
4180 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4181 {
4182         int con = op->height;
4183         int rc;
4184
4185         if (vc->vc_mode != KD_TEXT)
4186                 return -EINVAL;
4187
4188         console_lock();
4189         if (!vc->vc_sw->con_font_copy)
4190                 rc = -ENOSYS;
4191         else if (con < 0 || !vc_cons_allocated(con))
4192                 rc = -ENOTTY;
4193         else if (con == vc->vc_num)     /* nothing to do */
4194                 rc = 0;
4195         else
4196                 rc = vc->vc_sw->con_font_copy(vc, con);
4197         console_unlock();
4198         return rc;
4199 }
4200
4201 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4202 {
4203         switch (op->op) {
4204         case KD_FONT_OP_SET:
4205                 return con_font_set(vc, op);
4206         case KD_FONT_OP_GET:
4207                 return con_font_get(vc, op);
4208         case KD_FONT_OP_SET_DEFAULT:
4209                 return con_font_default(vc, op);
4210         case KD_FONT_OP_COPY:
4211                 return con_font_copy(vc, op);
4212         }
4213         return -ENOSYS;
4214 }
4215
4216 /*
4217  *      Interface exported to selection and vcs.
4218  */
4219
4220 /* used by selection */
4221 u16 screen_glyph(struct vc_data *vc, int offset)
4222 {
4223         u16 w = scr_readw(screenpos(vc, offset, 1));
4224         u16 c = w & 0xff;
4225
4226         if (w & vc->vc_hi_font_mask)
4227                 c |= 0x100;
4228         return c;
4229 }
4230 EXPORT_SYMBOL_GPL(screen_glyph);
4231
4232 /* used by vcs - note the word offset */
4233 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4234 {
4235         return screenpos(vc, 2 * w_offset, viewed);
4236 }
4237
4238 void getconsxy(struct vc_data *vc, unsigned char *p)
4239 {
4240         p[0] = vc->vc_x;
4241         p[1] = vc->vc_y;
4242 }
4243
4244 void putconsxy(struct vc_data *vc, unsigned char *p)
4245 {
4246         hide_cursor(vc);
4247         gotoxy(vc, p[0], p[1]);
4248         set_cursor(vc);
4249 }
4250
4251 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4252 {
4253         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4254                 return softcursor_original;
4255         return scr_readw(org);
4256 }
4257
4258 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4259 {
4260         scr_writew(val, org);
4261         if ((unsigned long)org == vc->vc_pos) {
4262                 softcursor_original = -1;
4263                 add_softcursor(vc);
4264         }
4265 }
4266
4267 void vcs_scr_updated(struct vc_data *vc)
4268 {
4269         notify_update(vc);
4270 }
4271
4272 /*
4273  *      Visible symbols for modules
4274  */
4275
4276 EXPORT_SYMBOL(color_table);
4277 EXPORT_SYMBOL(default_red);
4278 EXPORT_SYMBOL(default_grn);
4279 EXPORT_SYMBOL(default_blu);
4280 EXPORT_SYMBOL(update_region);
4281 EXPORT_SYMBOL(redraw_screen);
4282 EXPORT_SYMBOL(vc_resize);
4283 EXPORT_SYMBOL(fg_console);
4284 EXPORT_SYMBOL(console_blank_hook);
4285 EXPORT_SYMBOL(console_blanked);
4286 EXPORT_SYMBOL(vc_cons);
4287 EXPORT_SYMBOL(global_cursor_default);
4288 #ifndef VT_SINGLE_DRIVER
4289 EXPORT_SYMBOL(take_over_console);
4290 EXPORT_SYMBOL(give_up_console);
4291 #endif