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 <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111
 112 struct con_driver {
 113         const struct consw *con;
 114         const char *desc;
 115         struct device *dev;
 116         int node;
 117         int first;
 118         int last;
 119         int flag;
 120 };
 121
 122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 123 const struct consw *conswitchp;
 124
 125 /* A bitmap for codes <32. A bit of 1 indicates that the code
 126  * corresponding to that bit number invokes some special action
 127  * (such as cursor movement) and should not be displayed as a
 128  * glyph unless the disp_ctrl mode is explicitly enabled.
 129  */
 130 #define CTRL_ACTION 0x0d00ff81
 131 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 132
 133 /*
 134  * Here is the default bell parameters: 750HZ, 1/8th of a second
 135  */
 136 #define DEFAULT_BELL_PITCH      750
 137 #define DEFAULT_BELL_DURATION   (HZ/8)
 138
 139 struct vc vc_cons [MAX_NR_CONSOLES];
 140
 141 #ifndef VT_SINGLE_DRIVER
 142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 143 #endif
 144
 145 static int con_open(struct tty_struct *, struct file *);
 146 static void vc_init(struct vc_data *vc, unsigned int rows,
 147                     unsigned int cols, int do_clear);
 148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 149 static void save_cur(struct vc_data *vc);
 150 static void reset_terminal(struct vc_data *vc, int do_clear);
 151 static void con_flush_chars(struct tty_struct *tty);
 152 static int set_vesa_blanking(char __user *p);
 153 static void set_cursor(struct vc_data *vc);
 154 static void hide_cursor(struct vc_data *vc);
 155 static void console_callback(struct work_struct *ignored);
 156 static void blank_screen_t(unsigned long dummy);
 157 static void set_palette(struct vc_data *vc);
 158
 159 static int printable;           /* Is console ready for printing? */
 160 int default_utf8 = true;
 161 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 162 int global_cursor_default = -1;
 163 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 164
 165 static int cur_default = CUR_DEFAULT;
 166 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 167
 168 /*
 169  * ignore_poke: don't unblank the screen when things are typed.  This is
 170  * mainly for the privacy of braille terminal users.
 171  */
 172 static int ignore_poke;
 173
 174 int do_poke_blanked_console;
 175 int console_blanked;
 176
 177 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 178 static int vesa_off_interval;
 179 static int blankinterval = 10*60;
 180 core_param(consoleblank, blankinterval, int, 0444);
 181
 182 static DECLARE_WORK(console_work, console_callback);
 183
 184 /*
 185  * fg_console is the current virtual console,
 186  * last_console is the last used one,
 187  * want_console is the console we want to switch to,
 188  * saved_* variants are for save/restore around kernel debugger enter/leave
 189  */
 190 int fg_console;
 191 int last_console;
 192 int want_console = -1;
 193 static int saved_fg_console;
 194 static int saved_last_console;
 195 static int saved_want_console;
 196 static int saved_vc_mode;
 197 static int saved_console_blanked;
 198
 199 /*
 200  * For each existing display, we have a pointer to console currently visible
 201  * on that display, allowing consoles other than fg_console to be refreshed
 202  * appropriately. Unless the low-level driver supplies its own display_fg
 203  * variable, we use this one for the "master display".
 204  */
 205 static struct vc_data *master_display_fg;
 206
 207 /*
 208  * Unfortunately, we need to delay tty echo when we're currently writing to the
 209  * console since the code is (and always was) not re-entrant, so we schedule
 210  * all flip requests to process context with schedule-task() and run it from
 211  * console_callback().
 212  */
 213
 214 /*
 215  * For the same reason, we defer scrollback to the console callback.
 216  */
 217 static int scrollback_delta;
 218
 219 /*
 220  * Hook so that the power management routines can (un)blank
 221  * the console on our behalf.
 222  */
 223 int (*console_blank_hook)(int);
 224
 225 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 226 static int blank_state;
 227 static int blank_timer_expired;
 228 enum {
 229         blank_off = 0,
 230         blank_normal_wait,
 231         blank_vesa_wait,
 232 };
 233
 234 /*
 235  * /sys/class/tty/tty0/
 236  *
 237  * the attribute 'active' contains the name of the current vc
 238  * console and it supports poll() to detect vc switches
 239  */
 240 static struct device *tty0dev;
 241
 242 /*
 243  * Notifier list for console events.
 244  */
 245 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 246
 247 int register_vt_notifier(struct notifier_block *nb)
 248 {
 249         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 250 }
 251 EXPORT_SYMBOL_GPL(register_vt_notifier);
 252
 253 int unregister_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 258
 259 static void notify_write(struct vc_data *vc, unsigned int unicode)
 260 {
 261         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 262         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 263 }
 264
 265 static void notify_update(struct vc_data *vc)
 266 {
 267         struct vt_notifier_param param = { .vc = vc };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 269 }
 270 /*
 271  *      Low-Level Functions
 272  */
 273
 274 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 275
 276 #ifdef VT_BUF_VRAM_ONLY
 277 #define DO_UPDATE(vc)   0
 278 #else
 279 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 280 #endif
 281
 282 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 283 {
 284         unsigned short *p;
 285
 286         if (!viewed)
 287                 p = (unsigned short *)(vc->vc_origin + offset);
 288         else if (!vc->vc_sw->con_screen_pos)
 289                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 290         else
 291                 p = vc->vc_sw->con_screen_pos(vc, offset);
 292         return p;
 293 }
 294
 295 /* Called  from the keyboard irq path.. */
 296 static inline void scrolldelta(int lines)
 297 {
 298         /* FIXME */
 299         /* scrolldelta needs some kind of consistency lock, but the BKL was
 300            and still is not protecting versus the scheduled back end */
 301         scrollback_delta += lines;
 302         schedule_console_callback();
 303 }
 304
 305 void schedule_console_callback(void)
 306 {
 307         schedule_work(&console_work);
 308 }
 309
 310 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 311 {
 312         unsigned short *d, *s;
 313
 314         if (t+nr >= b)
 315                 nr = b - t - 1;
 316         if (b > vc->vc_rows || t >= b || nr < 1)
 317                 return;
 318         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 319                 return;
 320         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 321         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 322         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 323         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 324                     vc->vc_size_row * nr);
 325 }
 326
 327 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 328 {
 329         unsigned short *s;
 330         unsigned int step;
 331
 332         if (t+nr >= b)
 333                 nr = b - t - 1;
 334         if (b > vc->vc_rows || t >= b || nr < 1)
 335                 return;
 336         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 337                 return;
 338         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 339         step = vc->vc_cols * nr;
 340         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 341         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 342 }
 343
 344 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 345 {
 346 #ifndef VT_BUF_VRAM_ONLY
 347         unsigned int xx, yy, offset;
 348         u16 *p;
 349
 350         p = (u16 *) start;
 351         if (!vc->vc_sw->con_getxy) {
 352                 offset = (start - vc->vc_origin) / 2;
 353                 xx = offset % vc->vc_cols;
 354                 yy = offset / vc->vc_cols;
 355         } else {
 356                 int nxx, nyy;
 357                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 358                 xx = nxx; yy = nyy;
 359         }
 360         for(;;) {
 361                 u16 attrib = scr_readw(p) & 0xff00;
 362                 int startx = xx;
 363                 u16 *q = p;
 364                 while (xx < vc->vc_cols && count) {
 365                         if (attrib != (scr_readw(p) & 0xff00)) {
 366                                 if (p > q)
 367                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 368                                 startx = xx;
 369                                 q = p;
 370                                 attrib = scr_readw(p) & 0xff00;
 371                         }
 372                         p++;
 373                         xx++;
 374                         count--;
 375                 }
 376                 if (p > q)
 377                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 378                 if (!count)
 379                         break;
 380                 xx = 0;
 381                 yy++;
 382                 if (vc->vc_sw->con_getxy) {
 383                         p = (u16 *)start;
 384                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 385                 }
 386         }
 387 #endif
 388 }
 389
 390 void update_region(struct vc_data *vc, unsigned long start, int count)
 391 {
 392         WARN_CONSOLE_UNLOCKED();
 393
 394         if (DO_UPDATE(vc)) {
 395                 hide_cursor(vc);
 396                 do_update_region(vc, start, count);
 397                 set_cursor(vc);
 398         }
 399 }
 400
 401 /* Structure of attributes is hardware-dependent */
 402
 403 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 404     u8 _underline, u8 _reverse, u8 _italic)
 405 {
 406         if (vc->vc_sw->con_build_attr)
 407                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 408                        _blink, _underline, _reverse, _italic);
 409
 410 #ifndef VT_BUF_VRAM_ONLY
 411 /*
 412  * ++roman: I completely changed the attribute format for monochrome
 413  * mode (!can_do_color). The formerly used MDA (monochrome display
 414  * adapter) format didn't allow the combination of certain effects.
 415  * Now the attribute is just a bit vector:
 416  *  Bit 0..1: intensity (0..2)
 417  *  Bit 2   : underline
 418  *  Bit 3   : reverse
 419  *  Bit 7   : blink
 420  */
 421         {
 422         u8 a = _color;
 423         if (!vc->vc_can_do_color)
 424                 return _intensity |
 425                        (_italic ? 2 : 0) |
 426                        (_underline ? 4 : 0) |
 427                        (_reverse ? 8 : 0) |
 428                        (_blink ? 0x80 : 0);
 429         if (_italic)
 430                 a = (a & 0xF0) | vc->vc_itcolor;
 431         else if (_underline)
 432                 a = (a & 0xf0) | vc->vc_ulcolor;
 433         else if (_intensity == 0)
 434                 a = (a & 0xf0) | vc->vc_ulcolor;
 435         if (_reverse)
 436                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 437         if (_blink)
 438                 a ^= 0x80;
 439         if (_intensity == 2)
 440                 a ^= 0x08;
 441         if (vc->vc_hi_font_mask == 0x100)
 442                 a <<= 1;
 443         return a;
 444         }
 445 #else
 446         return 0;
 447 #endif
 448 }
 449
 450 static void update_attr(struct vc_data *vc)
 451 {
 452         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 453                       vc->vc_blink, vc->vc_underline,
 454                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 455         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 456 }
 457
 458 /* Note: inverting the screen twice should revert to the original state */
 459 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 460 {
 461         unsigned short *p;
 462
 463         WARN_CONSOLE_UNLOCKED();
 464
 465         count /= 2;
 466         p = screenpos(vc, offset, viewed);
 467         if (vc->vc_sw->con_invert_region)
 468                 vc->vc_sw->con_invert_region(vc, p, count);
 469 #ifndef VT_BUF_VRAM_ONLY
 470         else {
 471                 u16 *q = p;
 472                 int cnt = count;
 473                 u16 a;
 474
 475                 if (!vc->vc_can_do_color) {
 476                         while (cnt--) {
 477                             a = scr_readw(q);
 478                             a ^= 0x0800;
 479                             scr_writew(a, q);
 480                             q++;
 481                         }
 482                 } else if (vc->vc_hi_font_mask == 0x100) {
 483                         while (cnt--) {
 484                                 a = scr_readw(q);
 485                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 486                                 scr_writew(a, q);
 487                                 q++;
 488                         }
 489                 } else {
 490                         while (cnt--) {
 491                                 a = scr_readw(q);
 492                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 493                                 scr_writew(a, q);
 494                                 q++;
 495                         }
 496                 }
 497         }
 498 #endif
 499         if (DO_UPDATE(vc))
 500                 do_update_region(vc, (unsigned long) p, count);
 501 }
 502
 503 /* used by selection: complement pointer position */
 504 void complement_pos(struct vc_data *vc, int offset)
 505 {
 506         static int old_offset = -1;
 507         static unsigned short old;
 508         static unsigned short oldx, oldy;
 509
 510         WARN_CONSOLE_UNLOCKED();
 511
 512         if (old_offset != -1 && old_offset >= 0 &&
 513             old_offset < vc->vc_screenbuf_size) {
 514                 scr_writew(old, screenpos(vc, old_offset, 1));
 515                 if (DO_UPDATE(vc))
 516                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 517         }
 518
 519         old_offset = offset;
 520
 521         if (offset != -1 && offset >= 0 &&
 522             offset < vc->vc_screenbuf_size) {
 523                 unsigned short new;
 524                 unsigned short *p;
 525                 p = screenpos(vc, offset, 1);
 526                 old = scr_readw(p);
 527                 new = old ^ vc->vc_complement_mask;
 528                 scr_writew(new, p);
 529                 if (DO_UPDATE(vc)) {
 530                         oldx = (offset >> 1) % vc->vc_cols;
 531                         oldy = (offset >> 1) / vc->vc_cols;
 532                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 533                 }
 534         }
 535
 536 }
 537
 538 static void insert_char(struct vc_data *vc, unsigned int nr)
 539 {
 540         unsigned short *p = (unsigned short *) vc->vc_pos;
 541
 542         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 543         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 544         vc->vc_need_wrap = 0;
 545         if (DO_UPDATE(vc))
 546                 do_update_region(vc, (unsigned long) p,
 547                         vc->vc_cols - vc->vc_x);
 548 }
 549
 550 static void delete_char(struct vc_data *vc, unsigned int nr)
 551 {
 552         unsigned short *p = (unsigned short *) vc->vc_pos;
 553
 554         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 555         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 556                         nr * 2);
 557         vc->vc_need_wrap = 0;
 558         if (DO_UPDATE(vc))
 559                 do_update_region(vc, (unsigned long) p,
 560                         vc->vc_cols - vc->vc_x);
 561 }
 562
 563 static int softcursor_original;
 564
 565 static void add_softcursor(struct vc_data *vc)
 566 {
 567         int i = scr_readw((u16 *) vc->vc_pos);
 568         u32 type = vc->vc_cursor_type;
 569
 570         if (! (type & 0x10)) return;
 571         if (softcursor_original != -1) return;
 572         softcursor_original = i;
 573         i |= ((type >> 8) & 0xff00 );
 574         i ^= ((type) & 0xff00 );
 575         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 576         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 577         scr_writew(i, (u16 *) vc->vc_pos);
 578         if (DO_UPDATE(vc))
 579                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 580 }
 581
 582 static void hide_softcursor(struct vc_data *vc)
 583 {
 584         if (softcursor_original != -1) {
 585                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 586                 if (DO_UPDATE(vc))
 587                         vc->vc_sw->con_putc(vc, softcursor_original,
 588                                         vc->vc_y, vc->vc_x);
 589                 softcursor_original = -1;
 590         }
 591 }
 592
 593 static void hide_cursor(struct vc_data *vc)
 594 {
 595         if (vc == sel_cons)
 596                 clear_selection();
 597         vc->vc_sw->con_cursor(vc, CM_ERASE);
 598         hide_softcursor(vc);
 599 }
 600
 601 static void set_cursor(struct vc_data *vc)
 602 {
 603         if (!IS_FG(vc) || console_blanked ||
 604             vc->vc_mode == KD_GRAPHICS)
 605                 return;
 606         if (vc->vc_deccm) {
 607                 if (vc == sel_cons)
 608                         clear_selection();
 609                 add_softcursor(vc);
 610                 if ((vc->vc_cursor_type & 0x0f) != 1)
 611                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 612         } else
 613                 hide_cursor(vc);
 614 }
 615
 616 static void set_origin(struct vc_data *vc)
 617 {
 618         WARN_CONSOLE_UNLOCKED();
 619
 620         if (!CON_IS_VISIBLE(vc) ||
 621             !vc->vc_sw->con_set_origin ||
 622             !vc->vc_sw->con_set_origin(vc))
 623                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 624         vc->vc_visible_origin = vc->vc_origin;
 625         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 626         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 627 }
 628
 629 static inline void save_screen(struct vc_data *vc)
 630 {
 631         WARN_CONSOLE_UNLOCKED();
 632
 633         if (vc->vc_sw->con_save_screen)
 634                 vc->vc_sw->con_save_screen(vc);
 635 }
 636
 637 /*
 638  *      Redrawing of screen
 639  */
 640
 641 void clear_buffer_attributes(struct vc_data *vc)
 642 {
 643         unsigned short *p = (unsigned short *)vc->vc_origin;
 644         int count = vc->vc_screenbuf_size / 2;
 645         int mask = vc->vc_hi_font_mask | 0xff;
 646
 647         for (; count > 0; count--, p++) {
 648                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 649         }
 650 }
 651
 652 void redraw_screen(struct vc_data *vc, int is_switch)
 653 {
 654         int redraw = 0;
 655
 656         WARN_CONSOLE_UNLOCKED();
 657
 658         if (!vc) {
 659                 /* strange ... */
 660                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 661                 return;
 662         }
 663
 664         if (is_switch) {
 665                 struct vc_data *old_vc = vc_cons[fg_console].d;
 666                 if (old_vc == vc)
 667                         return;
 668                 if (!CON_IS_VISIBLE(vc))
 669                         redraw = 1;
 670                 *vc->vc_display_fg = vc;
 671                 fg_console = vc->vc_num;
 672                 hide_cursor(old_vc);
 673                 if (!CON_IS_VISIBLE(old_vc)) {
 674                         save_screen(old_vc);
 675                         set_origin(old_vc);
 676                 }
 677                 if (tty0dev)
 678                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 679         } else {
 680                 hide_cursor(vc);
 681                 redraw = 1;
 682         }
 683
 684         if (redraw) {
 685                 int update;
 686                 int old_was_color = vc->vc_can_do_color;
 687
 688                 set_origin(vc);
 689                 update = vc->vc_sw->con_switch(vc);
 690                 set_palette(vc);
 691                 /*
 692                  * If console changed from mono<->color, the best we can do
 693                  * is to clear the buffer attributes. As it currently stands,
 694                  * rebuilding new attributes from the old buffer is not doable
 695                  * without overly complex code.
 696                  */
 697                 if (old_was_color != vc->vc_can_do_color) {
 698                         update_attr(vc);
 699                         clear_buffer_attributes(vc);
 700                 }
 701
 702                 /* Forcibly update if we're panicing */
 703                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 704                     vt_force_oops_output(vc))
 705                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 706         }
 707         set_cursor(vc);
 708         if (is_switch) {
 709                 set_leds();
 710                 compute_shiftstate();
 711                 notify_update(vc);
 712         }
 713 }
 714
 715 /*
 716  *      Allocation, freeing and resizing of VTs.
 717  */
 718
 719 int vc_cons_allocated(unsigned int i)
 720 {
 721         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 722 }
 723
 724 static void visual_init(struct vc_data *vc, int num, int init)
 725 {
 726         /* ++Geert: vc->vc_sw->con_init determines console size */
 727         if (vc->vc_sw)
 728                 module_put(vc->vc_sw->owner);
 729         vc->vc_sw = conswitchp;
 730 #ifndef VT_SINGLE_DRIVER
 731         if (con_driver_map[num])
 732                 vc->vc_sw = con_driver_map[num];
 733 #endif
 734         __module_get(vc->vc_sw->owner);
 735         vc->vc_num = num;
 736         vc->vc_display_fg = &master_display_fg;
 737         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 738         vc->vc_uni_pagedir = 0;
 739         vc->vc_hi_font_mask = 0;
 740         vc->vc_complement_mask = 0;
 741         vc->vc_can_do_color = 0;
 742         vc->vc_panic_force_write = false;
 743         vc->vc_sw->con_init(vc, init);
 744         if (!vc->vc_complement_mask)
 745                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 746         vc->vc_s_complement_mask = vc->vc_complement_mask;
 747         vc->vc_size_row = vc->vc_cols << 1;
 748         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 749 }
 750
 751 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 752 {
 753         WARN_CONSOLE_UNLOCKED();
 754
 755         if (currcons >= MAX_NR_CONSOLES)
 756                 return -ENXIO;
 757         if (!vc_cons[currcons].d) {
 758             struct vc_data *vc;
 759             struct vt_notifier_param param;
 760
 761             /* prevent users from taking too much memory */
 762             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 763               return -EPERM;
 764
 765             /* due to the granularity of kmalloc, we waste some memory here */
 766             /* the alloc is done in two steps, to optimize the common situation
 767                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 768             /* although the numbers above are not valid since long ago, the
 769                point is still up-to-date and the comment still has its value
 770                even if only as a historical artifact.  --mj, July 1998 */
 771             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 772             if (!vc)
 773                 return -ENOMEM;
 774             vc_cons[currcons].d = vc;
 775             tty_port_init(&vc->port);
 776             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 777             visual_init(vc, currcons, 1);
 778             if (!*vc->vc_uni_pagedir_loc)
 779                 con_set_default_unimap(vc);
 780             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 781             if (!vc->vc_screenbuf) {
 782                 kfree(vc);
 783                 vc_cons[currcons].d = NULL;
 784                 return -ENOMEM;
 785             }
 786
 787             /* If no drivers have overridden us and the user didn't pass a
 788                boot option, default to displaying the cursor */
 789             if (global_cursor_default == -1)
 790                     global_cursor_default = 1;
 791
 792             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 793             vcs_make_sysfs(currcons);
 794             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 795         }
 796         return 0;
 797 }
 798
 799 static inline int resize_screen(struct vc_data *vc, int width, int height,
 800                                 int user)
 801 {
 802         /* Resizes the resolution of the display adapater */
 803         int err = 0;
 804
 805         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 806                 err = vc->vc_sw->con_resize(vc, width, height, user);
 807
 808         return err;
 809 }
 810
 811 /*
 812  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 813  * [this is to be used together with some user program
 814  * like resize that changes the hardware videomode]
 815  */
 816 #define VC_RESIZE_MAXCOL (32767)
 817 #define VC_RESIZE_MAXROW (32767)
 818
 819 /**
 820  *      vc_do_resize    -       resizing method for the tty
 821  *      @tty: tty being resized
 822  *      @real_tty: real tty (different to tty if a pty/tty pair)
 823  *      @vc: virtual console private data
 824  *      @cols: columns
 825  *      @lines: lines
 826  *
 827  *      Resize a virtual console, clipping according to the actual constraints.
 828  *      If the caller passes a tty structure then update the termios winsize
 829  *      information and perform any necessary signal handling.
 830  *
 831  *      Caller must hold the console semaphore. Takes the termios rwsem and
 832  *      ctrl_lock of the tty IFF a tty is passed.
 833  */
 834
 835 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 836                                 unsigned int cols, unsigned int lines)
 837 {
 838         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 839         unsigned long end;
 840         unsigned int old_rows, old_row_size;
 841         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 842         unsigned int user;
 843         unsigned short *newscreen;
 844
 845         WARN_CONSOLE_UNLOCKED();
 846
 847         if (!vc)
 848                 return -ENXIO;
 849
 850         user = vc->vc_resize_user;
 851         vc->vc_resize_user = 0;
 852
 853         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 854                 return -EINVAL;
 855
 856         new_cols = (cols ? cols : vc->vc_cols);
 857         new_rows = (lines ? lines : vc->vc_rows);
 858         new_row_size = new_cols << 1;
 859         new_screen_size = new_row_size * new_rows;
 860
 861         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 862                 return 0;
 863
 864         newscreen = kmalloc(new_screen_size, GFP_USER);
 865         if (!newscreen)
 866                 return -ENOMEM;
 867
 868         old_rows = vc->vc_rows;
 869         old_row_size = vc->vc_size_row;
 870
 871         err = resize_screen(vc, new_cols, new_rows, user);
 872         if (err) {
 873                 kfree(newscreen);
 874                 return err;
 875         }
 876
 877         vc->vc_rows = new_rows;
 878         vc->vc_cols = new_cols;
 879         vc->vc_size_row = new_row_size;
 880         vc->vc_screenbuf_size = new_screen_size;
 881
 882         rlth = min(old_row_size, new_row_size);
 883         rrem = new_row_size - rlth;
 884         old_origin = vc->vc_origin;
 885         new_origin = (long) newscreen;
 886         new_scr_end = new_origin + new_screen_size;
 887
 888         if (vc->vc_y > new_rows) {
 889                 if (old_rows - vc->vc_y < new_rows) {
 890                         /*
 891                          * Cursor near the bottom, copy contents from the
 892                          * bottom of buffer
 893                          */
 894                         old_origin += (old_rows - new_rows) * old_row_size;
 895                 } else {
 896                         /*
 897                          * Cursor is in no man's land, copy 1/2 screenful
 898                          * from the top and bottom of cursor position
 899                          */
 900                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 901                 }
 902         }
 903
 904         end = old_origin + old_row_size * min(old_rows, new_rows);
 905
 906         update_attr(vc);
 907
 908         while (old_origin < end) {
 909                 scr_memcpyw((unsigned short *) new_origin,
 910                             (unsigned short *) old_origin, rlth);
 911                 if (rrem)
 912                         scr_memsetw((void *)(new_origin + rlth),
 913                                     vc->vc_video_erase_char, rrem);
 914                 old_origin += old_row_size;
 915                 new_origin += new_row_size;
 916         }
 917         if (new_scr_end > new_origin)
 918                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 919                             new_scr_end - new_origin);
 920         kfree(vc->vc_screenbuf);
 921         vc->vc_screenbuf = newscreen;
 922         vc->vc_screenbuf_size = new_screen_size;
 923         set_origin(vc);
 924
 925         /* do part of a reset_terminal() */
 926         vc->vc_top = 0;
 927         vc->vc_bottom = vc->vc_rows;
 928         gotoxy(vc, vc->vc_x, vc->vc_y);
 929         save_cur(vc);
 930
 931         if (tty) {
 932                 /* Rewrite the requested winsize data with the actual
 933                    resulting sizes */
 934                 struct winsize ws;
 935                 memset(&ws, 0, sizeof(ws));
 936                 ws.ws_row = vc->vc_rows;
 937                 ws.ws_col = vc->vc_cols;
 938                 ws.ws_ypixel = vc->vc_scan_lines;
 939                 tty_do_resize(tty, &ws);
 940         }
 941
 942         if (CON_IS_VISIBLE(vc))
 943                 update_screen(vc);
 944         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 945         return err;
 946 }
 947
 948 /**
 949  *      vc_resize               -       resize a VT
 950  *      @vc: virtual console
 951  *      @cols: columns
 952  *      @rows: rows
 953  *
 954  *      Resize a virtual console as seen from the console end of things. We
 955  *      use the common vc_do_resize methods to update the structures. The
 956  *      caller must hold the console sem to protect console internals and
 957  *      vc->port.tty
 958  */
 959
 960 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 961 {
 962         return vc_do_resize(vc->port.tty, vc, cols, rows);
 963 }
 964
 965 /**
 966  *      vt_resize               -       resize a VT
 967  *      @tty: tty to resize
 968  *      @ws: winsize attributes
 969  *
 970  *      Resize a virtual terminal. This is called by the tty layer as we
 971  *      register our own handler for resizing. The mutual helper does all
 972  *      the actual work.
 973  *
 974  *      Takes the console sem and the called methods then take the tty
 975  *      termios_rwsem and the tty ctrl_lock in that order.
 976  */
 977 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 978 {
 979         struct vc_data *vc = tty->driver_data;
 980         int ret;
 981
 982         console_lock();
 983         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 984         console_unlock();
 985         return ret;
 986 }
 987
 988 struct vc_data *vc_deallocate(unsigned int currcons)
 989 {
 990         struct vc_data *vc = NULL;
 991
 992         WARN_CONSOLE_UNLOCKED();
 993
 994         if (vc_cons_allocated(currcons)) {
 995                 struct vt_notifier_param param;
 996
 997                 param.vc = vc = vc_cons[currcons].d;
 998                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 999                 vcs_remove_sysfs(currcons);
1000                 vc->vc_sw->con_deinit(vc);
1001                 put_pid(vc->vt_pid);
1002                 module_put(vc->vc_sw->owner);
1003                 kfree(vc->vc_screenbuf);
1004                 vc_cons[currcons].d = NULL;
1005         }
1006         return vc;
1007 }
1008
1009 /*
1010  *      VT102 emulator
1011  */
1012
1013 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1014 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1015 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1016
1017 #define decarm          VC_REPEAT
1018 #define decckm          VC_CKMODE
1019 #define kbdapplic       VC_APPLIC
1020 #define lnm             VC_CRLF
1021
1022 /*
1023  * this is what the terminal answers to a ESC-Z or csi0c query.
1024  */
1025 #define VT100ID "\033[?1;2c"
1026 #define VT102ID "\033[?6c"
1027
1028 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1029                                        8,12,10,14, 9,13,11,15 };
1030
1031 /* the default colour table, for VGA+ colour systems */
1032 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1033     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1034 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1035     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1036 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1037     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1038
1039 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1040 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1041 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1042
1043 /*
1044  * gotoxy() must verify all boundaries, because the arguments
1045  * might also be negative. If the given position is out of
1046  * bounds, the cursor is placed at the nearest margin.
1047  */
1048 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1049 {
1050         int min_y, max_y;
1051
1052         if (new_x < 0)
1053                 vc->vc_x = 0;
1054         else {
1055                 if (new_x >= vc->vc_cols)
1056                         vc->vc_x = vc->vc_cols - 1;
1057                 else
1058                         vc->vc_x = new_x;
1059         }
1060
1061         if (vc->vc_decom) {
1062                 min_y = vc->vc_top;
1063                 max_y = vc->vc_bottom;
1064         } else {
1065                 min_y = 0;
1066                 max_y = vc->vc_rows;
1067         }
1068         if (new_y < min_y)
1069                 vc->vc_y = min_y;
1070         else if (new_y >= max_y)
1071                 vc->vc_y = max_y - 1;
1072         else
1073                 vc->vc_y = new_y;
1074         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1075         vc->vc_need_wrap = 0;
1076 }
1077
1078 /* for absolute user moves, when decom is set */
1079 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1080 {
1081         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1082 }
1083
1084 void scrollback(struct vc_data *vc, int lines)
1085 {
1086         if (!lines)
1087                 lines = vc->vc_rows / 2;
1088         scrolldelta(-lines);
1089 }
1090
1091 void scrollfront(struct vc_data *vc, int lines)
1092 {
1093         if (!lines)
1094                 lines = vc->vc_rows / 2;
1095         scrolldelta(lines);
1096 }
1097
1098 static void lf(struct vc_data *vc)
1099 {
1100         /* don't scroll if above bottom of scrolling region, or
1101          * if below scrolling region
1102          */
1103         if (vc->vc_y + 1 == vc->vc_bottom)
1104                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1105         else if (vc->vc_y < vc->vc_rows - 1) {
1106                 vc->vc_y++;
1107                 vc->vc_pos += vc->vc_size_row;
1108         }
1109         vc->vc_need_wrap = 0;
1110         notify_write(vc, '\n');
1111 }
1112
1113 static void ri(struct vc_data *vc)
1114 {
1115         /* don't scroll if below top of scrolling region, or
1116          * if above scrolling region
1117          */
1118         if (vc->vc_y == vc->vc_top)
1119                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1120         else if (vc->vc_y > 0) {
1121                 vc->vc_y--;
1122                 vc->vc_pos -= vc->vc_size_row;
1123         }
1124         vc->vc_need_wrap = 0;
1125 }
1126
1127 static inline void cr(struct vc_data *vc)
1128 {
1129         vc->vc_pos -= vc->vc_x << 1;
1130         vc->vc_need_wrap = vc->vc_x = 0;
1131         notify_write(vc, '\r');
1132 }
1133
1134 static inline void bs(struct vc_data *vc)
1135 {
1136         if (vc->vc_x) {
1137                 vc->vc_pos -= 2;
1138                 vc->vc_x--;
1139                 vc->vc_need_wrap = 0;
1140                 notify_write(vc, '\b');
1141         }
1142 }
1143
1144 static inline void del(struct vc_data *vc)
1145 {
1146         /* ignored */
1147 }
1148
1149 static void csi_J(struct vc_data *vc, int vpar)
1150 {
1151         unsigned int count;
1152         unsigned short * start;
1153
1154         switch (vpar) {
1155                 case 0: /* erase from cursor to end of display */
1156                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1157                         start = (unsigned short *)vc->vc_pos;
1158                         break;
1159                 case 1: /* erase from start to cursor */
1160                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1161                         start = (unsigned short *)vc->vc_origin;
1162                         break;
1163                 case 3: /* erase scroll-back buffer (and whole display) */
1164                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1165                                     vc->vc_screenbuf_size >> 1);
1166                         set_origin(vc);
1167                         /* fall through */
1168                 case 2: /* erase whole display */
1169                         count = vc->vc_cols * vc->vc_rows;
1170                         start = (unsigned short *)vc->vc_origin;
1171                         break;
1172                 default:
1173                         return;
1174         }
1175         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1176         if (DO_UPDATE(vc))
1177                 do_update_region(vc, (unsigned long) start, count);
1178         vc->vc_need_wrap = 0;
1179 }
1180
1181 static void csi_K(struct vc_data *vc, int vpar)
1182 {
1183         unsigned int count;
1184         unsigned short * start;
1185
1186         switch (vpar) {
1187                 case 0: /* erase from cursor to end of line */
1188                         count = vc->vc_cols - vc->vc_x;
1189                         start = (unsigned short *)vc->vc_pos;
1190                         break;
1191                 case 1: /* erase from start of line to cursor */
1192                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1193                         count = vc->vc_x + 1;
1194                         break;
1195                 case 2: /* erase whole line */
1196                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1197                         count = vc->vc_cols;
1198                         break;
1199                 default:
1200                         return;
1201         }
1202         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1203         vc->vc_need_wrap = 0;
1204         if (DO_UPDATE(vc))
1205                 do_update_region(vc, (unsigned long) start, count);
1206 }
1207
1208 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1209 {                                         /* not vt100? */
1210         int count;
1211
1212         if (!vpar)
1213                 vpar++;
1214         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1215
1216         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1217         if (DO_UPDATE(vc))
1218                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1219         vc->vc_need_wrap = 0;
1220 }
1221
1222 static void default_attr(struct vc_data *vc)
1223 {
1224         vc->vc_intensity = 1;
1225         vc->vc_italic = 0;
1226         vc->vc_underline = 0;
1227         vc->vc_reverse = 0;
1228         vc->vc_blink = 0;
1229         vc->vc_color = vc->vc_def_color;
1230 }
1231
1232 /* console_lock is held */
1233 static void csi_m(struct vc_data *vc)
1234 {
1235         int i;
1236
1237         for (i = 0; i <= vc->vc_npar; i++)
1238                 switch (vc->vc_par[i]) {
1239                         case 0: /* all attributes off */
1240                                 default_attr(vc);
1241                                 break;
1242                         case 1:
1243                                 vc->vc_intensity = 2;
1244                                 break;
1245                         case 2:
1246                                 vc->vc_intensity = 0;
1247                                 break;
1248                         case 3:
1249                                 vc->vc_italic = 1;
1250                                 break;
1251                         case 4:
1252                                 vc->vc_underline = 1;
1253                                 break;
1254                         case 5:
1255                                 vc->vc_blink = 1;
1256                                 break;
1257                         case 7:
1258                                 vc->vc_reverse = 1;
1259                                 break;
1260                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1261                                   * Select primary font, don't display
1262                                   * control chars if defined, don't set
1263                                   * bit 8 on output.
1264                                   */
1265                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1266                                                 ? vc->vc_G0_charset
1267                                                 : vc->vc_G1_charset, vc);
1268                                 vc->vc_disp_ctrl = 0;
1269                                 vc->vc_toggle_meta = 0;
1270                                 break;
1271                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1272                                   * Select first alternate font, lets
1273                                   * chars < 32 be displayed as ROM chars.
1274                                   */
1275                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1276                                 vc->vc_disp_ctrl = 1;
1277                                 vc->vc_toggle_meta = 0;
1278                                 break;
1279                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1280                                   * Select second alternate font, toggle
1281                                   * high bit before displaying as ROM char.
1282                                   */
1283                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1284                                 vc->vc_disp_ctrl = 1;
1285                                 vc->vc_toggle_meta = 1;
1286                                 break;
1287                         case 21:
1288                         case 22:
1289                                 vc->vc_intensity = 1;
1290                                 break;
1291                         case 23:
1292                                 vc->vc_italic = 0;
1293                                 break;
1294                         case 24:
1295                                 vc->vc_underline = 0;
1296                                 break;
1297                         case 25:
1298                                 vc->vc_blink = 0;
1299                                 break;
1300                         case 27:
1301                                 vc->vc_reverse = 0;
1302                                 break;
1303                         case 39:
1304                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1305                                 break;
1306                         case 49:
1307                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1308                                 break;
1309                         default:
1310                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1311                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1312                                                 | (vc->vc_color & 0xf0);
1313                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1314                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1315                                                 | (vc->vc_color & 0x0f);
1316                                 break;
1317                 }
1318         update_attr(vc);
1319 }
1320
1321 static void respond_string(const char *p, struct tty_port *port)
1322 {
1323         while (*p) {
1324                 tty_insert_flip_char(port, *p, 0);
1325                 p++;
1326         }
1327         tty_schedule_flip(port);
1328 }
1329
1330 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1331 {
1332         char buf[40];
1333
1334         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1335         respond_string(buf, tty->port);
1336 }
1337
1338 static inline void status_report(struct tty_struct *tty)
1339 {
1340         respond_string("\033[0n", tty->port);   /* Terminal ok */
1341 }
1342
1343 static inline void respond_ID(struct tty_struct *tty)
1344 {
1345         respond_string(VT102ID, tty->port);
1346 }
1347
1348 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1349 {
1350         char buf[8];
1351
1352         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1353                 (char)('!' + mry));
1354         respond_string(buf, tty->port);
1355 }
1356
1357 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1358 int mouse_reporting(void)
1359 {
1360         return vc_cons[fg_console].d->vc_report_mouse;
1361 }
1362
1363 /* console_lock is held */
1364 static void set_mode(struct vc_data *vc, int on_off)
1365 {
1366         int i;
1367
1368         for (i = 0; i <= vc->vc_npar; i++)
1369                 if (vc->vc_ques) {
1370                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1371                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1372                                 if (on_off)
1373                                         set_kbd(vc, decckm);
1374                                 else
1375                                         clr_kbd(vc, decckm);
1376                                 break;
1377                         case 3: /* 80/132 mode switch unimplemented */
1378                                 vc->vc_deccolm = on_off;
1379 #if 0
1380                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1381                                 /* this alone does not suffice; some user mode
1382                                    utility has to change the hardware regs */
1383 #endif
1384                                 break;
1385                         case 5:                 /* Inverted screen on/off */
1386                                 if (vc->vc_decscnm != on_off) {
1387                                         vc->vc_decscnm = on_off;
1388                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1389                                         update_attr(vc);
1390                                 }
1391                                 break;
1392                         case 6:                 /* Origin relative/absolute */
1393                                 vc->vc_decom = on_off;
1394                                 gotoxay(vc, 0, 0);
1395                                 break;
1396                         case 7:                 /* Autowrap on/off */
1397                                 vc->vc_decawm = on_off;
1398                                 break;
1399                         case 8:                 /* Autorepeat on/off */
1400                                 if (on_off)
1401                                         set_kbd(vc, decarm);
1402                                 else
1403                                         clr_kbd(vc, decarm);
1404                                 break;
1405                         case 9:
1406                                 vc->vc_report_mouse = on_off ? 1 : 0;
1407                                 break;
1408                         case 25:                /* Cursor on/off */
1409                                 vc->vc_deccm = on_off;
1410                                 break;
1411                         case 1000:
1412                                 vc->vc_report_mouse = on_off ? 2 : 0;
1413                                 break;
1414                         }
1415                 } else {
1416                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1417                         case 3:                 /* Monitor (display ctrls) */
1418                                 vc->vc_disp_ctrl = on_off;
1419                                 break;
1420                         case 4:                 /* Insert Mode on/off */
1421                                 vc->vc_decim = on_off;
1422                                 break;
1423                         case 20:                /* Lf, Enter == CrLf/Lf */
1424                                 if (on_off)
1425                                         set_kbd(vc, lnm);
1426                                 else
1427                                         clr_kbd(vc, lnm);
1428                                 break;
1429                         }
1430                 }
1431 }
1432
1433 /* console_lock is held */
1434 static void setterm_command(struct vc_data *vc)
1435 {
1436         switch(vc->vc_par[0]) {
1437                 case 1: /* set color for underline mode */
1438                         if (vc->vc_can_do_color &&
1439                                         vc->vc_par[1] < 16) {
1440                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1441                                 if (vc->vc_underline)
1442                                         update_attr(vc);
1443                         }
1444                         break;
1445                 case 2: /* set color for half intensity mode */
1446                         if (vc->vc_can_do_color &&
1447                                         vc->vc_par[1] < 16) {
1448                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1449                                 if (vc->vc_intensity == 0)
1450                                         update_attr(vc);
1451                         }
1452                         break;
1453                 case 8: /* store colors as defaults */
1454                         vc->vc_def_color = vc->vc_attr;
1455                         if (vc->vc_hi_font_mask == 0x100)
1456                                 vc->vc_def_color >>= 1;
1457                         default_attr(vc);
1458                         update_attr(vc);
1459                         break;
1460                 case 9: /* set blanking interval */
1461                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1462                         poke_blanked_console();
1463                         break;
1464                 case 10: /* set bell frequency in Hz */
1465                         if (vc->vc_npar >= 1)
1466                                 vc->vc_bell_pitch = vc->vc_par[1];
1467                         else
1468                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1469                         break;
1470                 case 11: /* set bell duration in msec */
1471                         if (vc->vc_npar >= 1)
1472                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1473                                         vc->vc_par[1] * HZ / 1000 : 0;
1474                         else
1475                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1476                         break;
1477                 case 12: /* bring specified console to the front */
1478                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1479                                 set_console(vc->vc_par[1] - 1);
1480                         break;
1481                 case 13: /* unblank the screen */
1482                         poke_blanked_console();
1483                         break;
1484                 case 14: /* set vesa powerdown interval */
1485                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1486                         break;
1487                 case 15: /* activate the previous console */
1488                         set_console(last_console);
1489                         break;
1490         }
1491 }
1492
1493 /* console_lock is held */
1494 static void csi_at(struct vc_data *vc, unsigned int nr)
1495 {
1496         if (nr > vc->vc_cols - vc->vc_x)
1497                 nr = vc->vc_cols - vc->vc_x;
1498         else if (!nr)
1499                 nr = 1;
1500         insert_char(vc, nr);
1501 }
1502
1503 /* console_lock is held */
1504 static void csi_L(struct vc_data *vc, unsigned int nr)
1505 {
1506         if (nr > vc->vc_rows - vc->vc_y)
1507                 nr = vc->vc_rows - vc->vc_y;
1508         else if (!nr)
1509                 nr = 1;
1510         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1511         vc->vc_need_wrap = 0;
1512 }
1513
1514 /* console_lock is held */
1515 static void csi_P(struct vc_data *vc, unsigned int nr)
1516 {
1517         if (nr > vc->vc_cols - vc->vc_x)
1518                 nr = vc->vc_cols - vc->vc_x;
1519         else if (!nr)
1520                 nr = 1;
1521         delete_char(vc, nr);
1522 }
1523
1524 /* console_lock is held */
1525 static void csi_M(struct vc_data *vc, unsigned int nr)
1526 {
1527         if (nr > vc->vc_rows - vc->vc_y)
1528                 nr = vc->vc_rows - vc->vc_y;
1529         else if (!nr)
1530                 nr=1;
1531         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1532         vc->vc_need_wrap = 0;
1533 }
1534
1535 /* console_lock is held (except via vc_init->reset_terminal */
1536 static void save_cur(struct vc_data *vc)
1537 {
1538         vc->vc_saved_x          = vc->vc_x;
1539         vc->vc_saved_y          = vc->vc_y;
1540         vc->vc_s_intensity      = vc->vc_intensity;
1541         vc->vc_s_italic         = vc->vc_italic;
1542         vc->vc_s_underline      = vc->vc_underline;
1543         vc->vc_s_blink          = vc->vc_blink;
1544         vc->vc_s_reverse        = vc->vc_reverse;
1545         vc->vc_s_charset        = vc->vc_charset;
1546         vc->vc_s_color          = vc->vc_color;
1547         vc->vc_saved_G0         = vc->vc_G0_charset;
1548         vc->vc_saved_G1         = vc->vc_G1_charset;
1549 }
1550
1551 /* console_lock is held */
1552 static void restore_cur(struct vc_data *vc)
1553 {
1554         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1555         vc->vc_intensity        = vc->vc_s_intensity;
1556         vc->vc_italic           = vc->vc_s_italic;
1557         vc->vc_underline        = vc->vc_s_underline;
1558         vc->vc_blink            = vc->vc_s_blink;
1559         vc->vc_reverse          = vc->vc_s_reverse;
1560         vc->vc_charset          = vc->vc_s_charset;
1561         vc->vc_color            = vc->vc_s_color;
1562         vc->vc_G0_charset       = vc->vc_saved_G0;
1563         vc->vc_G1_charset       = vc->vc_saved_G1;
1564         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1565         update_attr(vc);
1566         vc->vc_need_wrap = 0;
1567 }
1568
1569 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1570         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1571         ESpalette };
1572
1573 /* console_lock is held (except via vc_init()) */
1574 static void reset_terminal(struct vc_data *vc, int do_clear)
1575 {
1576         vc->vc_top              = 0;
1577         vc->vc_bottom           = vc->vc_rows;
1578         vc->vc_state            = ESnormal;
1579         vc->vc_ques             = 0;
1580         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1581         vc->vc_G0_charset       = LAT1_MAP;
1582         vc->vc_G1_charset       = GRAF_MAP;
1583         vc->vc_charset          = 0;
1584         vc->vc_need_wrap        = 0;
1585         vc->vc_report_mouse     = 0;
1586         vc->vc_utf              = default_utf8;
1587         vc->vc_utf_count        = 0;
1588
1589         vc->vc_disp_ctrl        = 0;
1590         vc->vc_toggle_meta      = 0;
1591
1592         vc->vc_decscnm          = 0;
1593         vc->vc_decom            = 0;
1594         vc->vc_decawm           = 1;
1595         vc->vc_deccm            = global_cursor_default;
1596         vc->vc_decim            = 0;
1597
1598         vt_reset_keyboard(vc->vc_num);
1599
1600         vc->vc_cursor_type = cur_default;
1601         vc->vc_complement_mask = vc->vc_s_complement_mask;
1602
1603         default_attr(vc);
1604         update_attr(vc);
1605
1606         vc->vc_tab_stop[0]      = 0x01010100;
1607         vc->vc_tab_stop[1]      =
1608         vc->vc_tab_stop[2]      =
1609         vc->vc_tab_stop[3]      =
1610         vc->vc_tab_stop[4]      =
1611         vc->vc_tab_stop[5]      =
1612         vc->vc_tab_stop[6]      =
1613         vc->vc_tab_stop[7]      = 0x01010101;
1614
1615         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1616         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1617
1618         gotoxy(vc, 0, 0);
1619         save_cur(vc);
1620         if (do_clear)
1621             csi_J(vc, 2);
1622 }
1623
1624 /* console_lock is held */
1625 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1626 {
1627         /*
1628          *  Control characters can be used in the _middle_
1629          *  of an escape sequence.
1630          */
1631         switch (c) {
1632         case 0:
1633                 return;
1634         case 7:
1635                 if (vc->vc_bell_duration)
1636                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1637                 return;
1638         case 8:
1639                 bs(vc);
1640                 return;
1641         case 9:
1642                 vc->vc_pos -= (vc->vc_x << 1);
1643                 while (vc->vc_x < vc->vc_cols - 1) {
1644                         vc->vc_x++;
1645                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1646                                 break;
1647                 }
1648                 vc->vc_pos += (vc->vc_x << 1);
1649                 notify_write(vc, '\t');
1650                 return;
1651         case 10: case 11: case 12:
1652                 lf(vc);
1653                 if (!is_kbd(vc, lnm))
1654                         return;
1655         case 13:
1656                 cr(vc);
1657                 return;
1658         case 14:
1659                 vc->vc_charset = 1;
1660                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1661                 vc->vc_disp_ctrl = 1;
1662                 return;
1663         case 15:
1664                 vc->vc_charset = 0;
1665                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1666                 vc->vc_disp_ctrl = 0;
1667                 return;
1668         case 24: case 26:
1669                 vc->vc_state = ESnormal;
1670                 return;
1671         case 27:
1672                 vc->vc_state = ESesc;
1673                 return;
1674         case 127:
1675                 del(vc);
1676                 return;
1677         case 128+27:
1678                 vc->vc_state = ESsquare;
1679                 return;
1680         }
1681         switch(vc->vc_state) {
1682         case ESesc:
1683                 vc->vc_state = ESnormal;
1684                 switch (c) {
1685                 case '[':
1686                         vc->vc_state = ESsquare;
1687                         return;
1688                 case ']':
1689                         vc->vc_state = ESnonstd;
1690                         return;
1691                 case '%':
1692                         vc->vc_state = ESpercent;
1693                         return;
1694                 case 'E':
1695                         cr(vc);
1696                         lf(vc);
1697                         return;
1698                 case 'M':
1699                         ri(vc);
1700                         return;
1701                 case 'D':
1702                         lf(vc);
1703                         return;
1704                 case 'H':
1705                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1706                         return;
1707                 case 'Z':
1708                         respond_ID(tty);
1709                         return;
1710                 case '7':
1711                         save_cur(vc);
1712                         return;
1713                 case '8':
1714                         restore_cur(vc);
1715                         return;
1716                 case '(':
1717                         vc->vc_state = ESsetG0;
1718                         return;
1719                 case ')':
1720                         vc->vc_state = ESsetG1;
1721                         return;
1722                 case '#':
1723                         vc->vc_state = EShash;
1724                         return;
1725                 case 'c':
1726                         reset_terminal(vc, 1);
1727                         return;
1728                 case '>':  /* Numeric keypad */
1729                         clr_kbd(vc, kbdapplic);
1730                         return;
1731                 case '=':  /* Appl. keypad */
1732                         set_kbd(vc, kbdapplic);
1733                         return;
1734                 }
1735                 return;
1736         case ESnonstd:
1737                 if (c=='P') {   /* palette escape sequence */
1738                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1739                                 vc->vc_par[vc->vc_npar] = 0;
1740                         vc->vc_npar = 0;
1741                         vc->vc_state = ESpalette;
1742                         return;
1743                 } else if (c=='R') {   /* reset palette */
1744                         reset_palette(vc);
1745                         vc->vc_state = ESnormal;
1746                 } else
1747                         vc->vc_state = ESnormal;
1748                 return;
1749         case ESpalette:
1750                 if (isxdigit(c)) {
1751                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1752                         if (vc->vc_npar == 7) {
1753                                 int i = vc->vc_par[0] * 3, j = 1;
1754                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1755                                 vc->vc_palette[i++] += vc->vc_par[j++];
1756                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1757                                 vc->vc_palette[i++] += vc->vc_par[j++];
1758                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1759                                 vc->vc_palette[i] += vc->vc_par[j];
1760                                 set_palette(vc);
1761                                 vc->vc_state = ESnormal;
1762                         }
1763                 } else
1764                         vc->vc_state = ESnormal;
1765                 return;
1766         case ESsquare:
1767                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1768                         vc->vc_par[vc->vc_npar] = 0;
1769                 vc->vc_npar = 0;
1770                 vc->vc_state = ESgetpars;
1771                 if (c == '[') { /* Function key */
1772                         vc->vc_state=ESfunckey;
1773                         return;
1774                 }
1775                 vc->vc_ques = (c == '?');
1776                 if (vc->vc_ques)
1777                         return;
1778         case ESgetpars:
1779                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1780                         vc->vc_npar++;
1781                         return;
1782                 } else if (c>='0' && c<='9') {
1783                         vc->vc_par[vc->vc_npar] *= 10;
1784                         vc->vc_par[vc->vc_npar] += c - '0';
1785                         return;
1786                 } else
1787                         vc->vc_state = ESgotpars;
1788         case ESgotpars:
1789                 vc->vc_state = ESnormal;
1790                 switch(c) {
1791                 case 'h':
1792                         set_mode(vc, 1);
1793                         return;
1794                 case 'l':
1795                         set_mode(vc, 0);
1796                         return;
1797                 case 'c':
1798                         if (vc->vc_ques) {
1799                                 if (vc->vc_par[0])
1800                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1801                                 else
1802                                         vc->vc_cursor_type = cur_default;
1803                                 return;
1804                         }
1805                         break;
1806                 case 'm':
1807                         if (vc->vc_ques) {
1808                                 clear_selection();
1809                                 if (vc->vc_par[0])
1810                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1811                                 else
1812                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1813                                 return;
1814                         }
1815                         break;
1816                 case 'n':
1817                         if (!vc->vc_ques) {
1818                                 if (vc->vc_par[0] == 5)
1819                                         status_report(tty);
1820                                 else if (vc->vc_par[0] == 6)
1821                                         cursor_report(vc, tty);
1822                         }
1823                         return;
1824                 }
1825                 if (vc->vc_ques) {
1826                         vc->vc_ques = 0;
1827                         return;
1828                 }
1829                 switch(c) {
1830                 case 'G': case '`':
1831                         if (vc->vc_par[0])
1832                                 vc->vc_par[0]--;
1833                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1834                         return;
1835                 case 'A':
1836                         if (!vc->vc_par[0])
1837                                 vc->vc_par[0]++;
1838                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1839                         return;
1840                 case 'B': case 'e':
1841                         if (!vc->vc_par[0])
1842                                 vc->vc_par[0]++;
1843                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1844                         return;
1845                 case 'C': case 'a':
1846                         if (!vc->vc_par[0])
1847                                 vc->vc_par[0]++;
1848                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1849                         return;
1850                 case 'D':
1851                         if (!vc->vc_par[0])
1852                                 vc->vc_par[0]++;
1853                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1854                         return;
1855                 case 'E':
1856                         if (!vc->vc_par[0])
1857                                 vc->vc_par[0]++;
1858                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1859                         return;
1860                 case 'F':
1861                         if (!vc->vc_par[0])
1862                                 vc->vc_par[0]++;
1863                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1864                         return;
1865                 case 'd':
1866                         if (vc->vc_par[0])
1867                                 vc->vc_par[0]--;
1868                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1869                         return;
1870                 case 'H': case 'f':
1871                         if (vc->vc_par[0])
1872                                 vc->vc_par[0]--;
1873                         if (vc->vc_par[1])
1874                                 vc->vc_par[1]--;
1875                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1876                         return;
1877                 case 'J':
1878                         csi_J(vc, vc->vc_par[0]);
1879                         return;
1880                 case 'K':
1881                         csi_K(vc, vc->vc_par[0]);
1882                         return;
1883                 case 'L':
1884                         csi_L(vc, vc->vc_par[0]);
1885                         return;
1886                 case 'M':
1887                         csi_M(vc, vc->vc_par[0]);
1888                         return;
1889                 case 'P':
1890                         csi_P(vc, vc->vc_par[0]);
1891                         return;
1892                 case 'c':
1893                         if (!vc->vc_par[0])
1894                                 respond_ID(tty);
1895                         return;
1896                 case 'g':
1897                         if (!vc->vc_par[0])
1898                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1899                         else if (vc->vc_par[0] == 3) {
1900                                 vc->vc_tab_stop[0] =
1901                                         vc->vc_tab_stop[1] =
1902                                         vc->vc_tab_stop[2] =
1903                                         vc->vc_tab_stop[3] =
1904                                         vc->vc_tab_stop[4] =
1905                                         vc->vc_tab_stop[5] =
1906                                         vc->vc_tab_stop[6] =
1907                                         vc->vc_tab_stop[7] = 0;
1908                         }
1909                         return;
1910                 case 'm':
1911                         csi_m(vc);
1912                         return;
1913                 case 'q': /* DECLL - but only 3 leds */
1914                         /* map 0,1,2,3 to 0,1,2,4 */
1915                         if (vc->vc_par[0] < 4)
1916                                 vt_set_led_state(vc->vc_num,
1917                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1918                         return;
1919                 case 'r':
1920                         if (!vc->vc_par[0])
1921                                 vc->vc_par[0]++;
1922                         if (!vc->vc_par[1])
1923                                 vc->vc_par[1] = vc->vc_rows;
1924                         /* Minimum allowed region is 2 lines */
1925                         if (vc->vc_par[0] < vc->vc_par[1] &&
1926                             vc->vc_par[1] <= vc->vc_rows) {
1927                                 vc->vc_top = vc->vc_par[0] - 1;
1928                                 vc->vc_bottom = vc->vc_par[1];
1929                                 gotoxay(vc, 0, 0);
1930                         }
1931                         return;
1932                 case 's':
1933                         save_cur(vc);
1934                         return;
1935                 case 'u':
1936                         restore_cur(vc);
1937                         return;
1938                 case 'X':
1939                         csi_X(vc, vc->vc_par[0]);
1940                         return;
1941                 case '@':
1942                         csi_at(vc, vc->vc_par[0]);
1943                         return;
1944                 case ']': /* setterm functions */
1945                         setterm_command(vc);
1946                         return;
1947                 }
1948                 return;
1949         case ESpercent:
1950                 vc->vc_state = ESnormal;
1951                 switch (c) {
1952                 case '@':  /* defined in ISO 2022 */
1953                         vc->vc_utf = 0;
1954                         return;
1955                 case 'G':  /* prelim official escape code */
1956                 case '8':  /* retained for compatibility */
1957                         vc->vc_utf = 1;
1958                         return;
1959                 }
1960                 return;
1961         case ESfunckey:
1962                 vc->vc_state = ESnormal;
1963                 return;
1964         case EShash:
1965                 vc->vc_state = ESnormal;
1966                 if (c == '8') {
1967                         /* DEC screen alignment test. kludge :-) */
1968                         vc->vc_video_erase_char =
1969                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1970                         csi_J(vc, 2);
1971                         vc->vc_video_erase_char =
1972                                 (vc->vc_video_erase_char & 0xff00) | ' ';
1973                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1974                 }
1975                 return;
1976         case ESsetG0:
1977                 if (c == '0')
1978                         vc->vc_G0_charset = GRAF_MAP;
1979                 else if (c == 'B')
1980                         vc->vc_G0_charset = LAT1_MAP;
1981                 else if (c == 'U')
1982                         vc->vc_G0_charset = IBMPC_MAP;
1983                 else if (c == 'K')
1984                         vc->vc_G0_charset = USER_MAP;
1985                 if (vc->vc_charset == 0)
1986                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1987                 vc->vc_state = ESnormal;
1988                 return;
1989         case ESsetG1:
1990                 if (c == '0')
1991                         vc->vc_G1_charset = GRAF_MAP;
1992                 else if (c == 'B')
1993                         vc->vc_G1_charset = LAT1_MAP;
1994                 else if (c == 'U')
1995                         vc->vc_G1_charset = IBMPC_MAP;
1996                 else if (c == 'K')
1997                         vc->vc_G1_charset = USER_MAP;
1998                 if (vc->vc_charset == 1)
1999                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2000                 vc->vc_state = ESnormal;
2001                 return;
2002         default:
2003                 vc->vc_state = ESnormal;
2004         }
2005 }
2006
2007 /* is_double_width() is based on the wcwidth() implementation by
2008  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2009  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2010  */
2011 struct interval {
2012         uint32_t first;
2013         uint32_t last;
2014 };
2015
2016 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2017 {
2018         int min = 0;
2019         int mid;
2020
2021         if (ucs < table[0].first || ucs > table[max].last)
2022                 return 0;
2023         while (max >= min) {
2024                 mid = (min + max) / 2;
2025                 if (ucs > table[mid].last)
2026                         min = mid + 1;
2027                 else if (ucs < table[mid].first)
2028                         max = mid - 1;
2029                 else
2030                         return 1;
2031         }
2032         return 0;
2033 }
2034
2035 static int is_double_width(uint32_t ucs)
2036 {
2037         static const struct interval double_width[] = {
2038                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2039                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2040                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2041                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2042         };
2043         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2044 }
2045
2046 /* acquires console_lock */
2047 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2048 {
2049 #ifdef VT_BUF_VRAM_ONLY
2050 #define FLUSH do { } while(0);
2051 #else
2052 #define FLUSH if (draw_x >= 0) { \
2053         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2054         draw_x = -1; \
2055         }
2056 #endif
2057
2058         int c, tc, ok, n = 0, draw_x = -1;
2059         unsigned int currcons;
2060         unsigned long draw_from = 0, draw_to = 0;
2061         struct vc_data *vc;
2062         unsigned char vc_attr;
2063         struct vt_notifier_param param;
2064         uint8_t rescan;
2065         uint8_t inverse;
2066         uint8_t width;
2067         u16 himask, charmask;
2068
2069         if (in_interrupt())
2070                 return count;
2071
2072         might_sleep();
2073
2074         console_lock();
2075         vc = tty->driver_data;
2076         if (vc == NULL) {
2077                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2078                 console_unlock();
2079                 return 0;
2080         }
2081
2082         currcons = vc->vc_num;
2083         if (!vc_cons_allocated(currcons)) {
2084                 /* could this happen? */
2085                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2086                 console_unlock();
2087                 return 0;
2088         }
2089
2090         himask = vc->vc_hi_font_mask;
2091         charmask = himask ? 0x1ff : 0xff;
2092
2093         /* undraw cursor first */
2094         if (IS_FG(vc))
2095                 hide_cursor(vc);
2096
2097         param.vc = vc;
2098
2099         while (!tty->stopped && count) {
2100                 int orig = *buf;
2101                 c = orig;
2102                 buf++;
2103                 n++;
2104                 count--;
2105                 rescan = 0;
2106                 inverse = 0;
2107                 width = 1;
2108
2109                 /* Do no translation at all in control states */
2110                 if (vc->vc_state != ESnormal) {
2111                         tc = c;
2112                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2113                     /* Combine UTF-8 into Unicode in vc_utf_char.
2114                      * vc_utf_count is the number of continuation bytes still
2115                      * expected to arrive.
2116                      * vc_npar is the number of continuation bytes arrived so
2117                      * far
2118                      */
2119 rescan_last_byte:
2120                     if ((c & 0xc0) == 0x80) {
2121                         /* Continuation byte received */
2122                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2123                         if (vc->vc_utf_count) {
2124                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2125                             vc->vc_npar++;
2126                             if (--vc->vc_utf_count) {
2127                                 /* Still need some bytes */
2128                                 continue;
2129                             }
2130                             /* Got a whole character */
2131                             c = vc->vc_utf_char;
2132                             /* Reject overlong sequences */
2133                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2134                                         c > utf8_length_changes[vc->vc_npar])
2135                                 c = 0xfffd;
2136                         } else {
2137                             /* Unexpected continuation byte */
2138                             vc->vc_utf_count = 0;
2139                             c = 0xfffd;
2140                         }
2141                     } else {
2142                         /* Single ASCII byte or first byte of a sequence received */
2143                         if (vc->vc_utf_count) {
2144                             /* Continuation byte expected */
2145                             rescan = 1;
2146                             vc->vc_utf_count = 0;
2147                             c = 0xfffd;
2148                         } else if (c > 0x7f) {
2149                             /* First byte of a multibyte sequence received */
2150                             vc->vc_npar = 0;
2151                             if ((c & 0xe0) == 0xc0) {
2152                                 vc->vc_utf_count = 1;
2153                                 vc->vc_utf_char = (c & 0x1f);
2154                             } else if ((c & 0xf0) == 0xe0) {
2155                                 vc->vc_utf_count = 2;
2156                                 vc->vc_utf_char = (c & 0x0f);
2157                             } else if ((c & 0xf8) == 0xf0) {
2158                                 vc->vc_utf_count = 3;
2159                                 vc->vc_utf_char = (c & 0x07);
2160                             } else if ((c & 0xfc) == 0xf8) {
2161                                 vc->vc_utf_count = 4;
2162                                 vc->vc_utf_char = (c & 0x03);
2163                             } else if ((c & 0xfe) == 0xfc) {
2164                                 vc->vc_utf_count = 5;
2165                                 vc->vc_utf_char = (c & 0x01);
2166                             } else {
2167                                 /* 254 and 255 are invalid */
2168                                 c = 0xfffd;
2169                             }
2170                             if (vc->vc_utf_count) {
2171                                 /* Still need some bytes */
2172                                 continue;
2173                             }
2174                         }
2175                         /* Nothing to do if an ASCII byte was received */
2176                     }
2177                     /* End of UTF-8 decoding. */
2178                     /* c is the received character, or U+FFFD for invalid sequences. */
2179                     /* Replace invalid Unicode code points with U+FFFD too */
2180                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2181                         c = 0xfffd;
2182                     tc = c;
2183                 } else {        /* no utf or alternate charset mode */
2184                     tc = vc_translate(vc, c);
2185                 }
2186
2187                 param.c = tc;
2188                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2189                                         &param) == NOTIFY_STOP)
2190                         continue;
2191
2192                 /* If the original code was a control character we
2193                  * only allow a glyph to be displayed if the code is
2194                  * not normally used (such as for cursor movement) or
2195                  * if the disp_ctrl mode has been explicitly enabled.
2196                  * Certain characters (as given by the CTRL_ALWAYS
2197                  * bitmap) are always displayed as control characters,
2198                  * as the console would be pretty useless without
2199                  * them; to display an arbitrary font position use the
2200                  * direct-to-font zone in UTF-8 mode.
2201                  */
2202                 ok = tc && (c >= 32 ||
2203                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2204                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2205                         && (c != 127 || vc->vc_disp_ctrl)
2206                         && (c != 128+27);
2207
2208                 if (vc->vc_state == ESnormal && ok) {
2209                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2210                                 if (is_double_width(c))
2211                                         width = 2;
2212                         }
2213                         /* Now try to find out how to display it */
2214                         tc = conv_uni_to_pc(vc, tc);
2215                         if (tc & ~charmask) {
2216                                 if (tc == -1 || tc == -2) {
2217                                     continue; /* nothing to display */
2218                                 }
2219                                 /* Glyph not found */
2220                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2221                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2222                                        This would make absolutely no sense with Unicode in mind,
2223                                        but do this for ASCII characters since a font may lack
2224                                        Unicode mapping info and we don't want to end up with
2225                                        having question marks only. */
2226                                     tc = c;
2227                                 } else {
2228                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2229                                     tc = conv_uni_to_pc(vc, 0xfffd);
2230                                     if (tc < 0) {
2231                                         inverse = 1;
2232                                         tc = conv_uni_to_pc(vc, '?');
2233                                         if (tc < 0) tc = '?';
2234                                     }
2235                                 }
2236                         }
2237
2238                         if (!inverse) {
2239                                 vc_attr = vc->vc_attr;
2240                         } else {
2241                                 /* invert vc_attr */
2242                                 if (!vc->vc_can_do_color) {
2243                                         vc_attr = (vc->vc_attr) ^ 0x08;
2244                                 } else if (vc->vc_hi_font_mask == 0x100) {
2245                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2246                                 } else {
2247                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2248                                 }
2249                                 FLUSH
2250                         }
2251
2252                         while (1) {
2253                                 if (vc->vc_need_wrap || vc->vc_decim)
2254                                         FLUSH
2255                                 if (vc->vc_need_wrap) {
2256                                         cr(vc);
2257                                         lf(vc);
2258                                 }
2259                                 if (vc->vc_decim)
2260                                         insert_char(vc, 1);
2261                                 scr_writew(himask ?
2262                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2263                                              (vc_attr << 8) + tc,
2264                                            (u16 *) vc->vc_pos);
2265                                 if (DO_UPDATE(vc) && draw_x < 0) {
2266                                         draw_x = vc->vc_x;
2267                                         draw_from = vc->vc_pos;
2268                                 }
2269                                 if (vc->vc_x == vc->vc_cols - 1) {
2270                                         vc->vc_need_wrap = vc->vc_decawm;
2271                                         draw_to = vc->vc_pos + 2;
2272                                 } else {
2273                                         vc->vc_x++;
2274                                         draw_to = (vc->vc_pos += 2);
2275                                 }
2276
2277                                 if (!--width) break;
2278
2279                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2280                                 if (tc < 0) tc = ' ';
2281                         }
2282                         notify_write(vc, c);
2283
2284                         if (inverse) {
2285                                 FLUSH
2286                         }
2287
2288                         if (rescan) {
2289                                 rescan = 0;
2290                                 inverse = 0;
2291                                 width = 1;
2292                                 c = orig;
2293                                 goto rescan_last_byte;
2294                         }
2295                         continue;
2296                 }
2297                 FLUSH
2298                 do_con_trol(tty, vc, orig);
2299         }
2300         FLUSH
2301         console_conditional_schedule();
2302         console_unlock();
2303         notify_update(vc);
2304         return n;
2305 #undef FLUSH
2306 }
2307
2308 /*
2309  * This is the console switching callback.
2310  *
2311  * Doing console switching in a process context allows
2312  * us to do the switches asynchronously (needed when we want
2313  * to switch due to a keyboard interrupt).  Synchronization
2314  * with other console code and prevention of re-entrancy is
2315  * ensured with console_lock.
2316  */
2317 static void console_callback(struct work_struct *ignored)
2318 {
2319         console_lock();
2320
2321         if (want_console >= 0) {
2322                 if (want_console != fg_console &&
2323                     vc_cons_allocated(want_console)) {
2324                         hide_cursor(vc_cons[fg_console].d);
2325                         change_console(vc_cons[want_console].d);
2326                         /* we only changed when the console had already
2327                            been allocated - a new console is not created
2328                            in an interrupt routine */
2329                 }
2330                 want_console = -1;
2331         }
2332         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2333                 do_poke_blanked_console = 0;
2334                 poke_blanked_console();
2335         }
2336         if (scrollback_delta) {
2337                 struct vc_data *vc = vc_cons[fg_console].d;
2338                 clear_selection();
2339                 if (vc->vc_mode == KD_TEXT)
2340                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2341                 scrollback_delta = 0;
2342         }
2343         if (blank_timer_expired) {
2344                 do_blank_screen(0);
2345                 blank_timer_expired = 0;
2346         }
2347         notify_update(vc_cons[fg_console].d);
2348
2349         console_unlock();
2350 }
2351
2352 int set_console(int nr)
2353 {
2354         struct vc_data *vc = vc_cons[fg_console].d;
2355
2356         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2357                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2358
2359                 /*
2360                  * Console switch will fail in console_callback() or
2361                  * change_console() so there is no point scheduling
2362                  * the callback
2363                  *
2364                  * Existing set_console() users don't check the return
2365                  * value so this shouldn't break anything
2366                  */
2367                 return -EINVAL;
2368         }
2369
2370         want_console = nr;
2371         schedule_console_callback();
2372
2373         return 0;
2374 }
2375
2376 struct tty_driver *console_driver;
2377
2378 #ifdef CONFIG_VT_CONSOLE
2379
2380 /**
2381  * vt_kmsg_redirect() - Sets/gets the kernel message console
2382  * @new:        The new virtual terminal number or -1 if the console should stay
2383  *              unchanged
2384  *
2385  * By default, the kernel messages are always printed on the current virtual
2386  * console. However, the user may modify that default with the
2387  * TIOCL_SETKMSGREDIRECT ioctl call.
2388  *
2389  * This function sets the kernel message console to be @new. It returns the old
2390  * virtual console number. The virtual terminal number 0 (both as parameter and
2391  * return value) means no redirection (i.e. always printed on the currently
2392  * active console).
2393  *
2394  * The parameter -1 means that only the current console is returned, but the
2395  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2396  * case to make the code more understandable.
2397  *
2398  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2399  * the parameter and always returns 0.
2400  */
2401 int vt_kmsg_redirect(int new)
2402 {
2403         static int kmsg_con;
2404
2405         if (new != -1)
2406                 return xchg(&kmsg_con, new);
2407         else
2408                 return kmsg_con;
2409 }
2410
2411 /*
2412  *      Console on virtual terminal
2413  *
2414  * The console must be locked when we get here.
2415  */
2416
2417 static void vt_console_print(struct console *co, const char *b, unsigned count)
2418 {
2419         struct vc_data *vc = vc_cons[fg_console].d;
2420         unsigned char c;
2421         static DEFINE_SPINLOCK(printing_lock);
2422         const ushort *start;
2423         ushort cnt = 0;
2424         ushort myx;
2425         int kmsg_console;
2426
2427         /* console busy or not yet initialized */
2428         if (!printable)
2429                 return;
2430         if (!spin_trylock(&printing_lock))
2431                 return;
2432
2433         kmsg_console = vt_get_kmsg_redirect();
2434         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2435                 vc = vc_cons[kmsg_console - 1].d;
2436
2437         /* read `x' only after setting currcons properly (otherwise
2438            the `x' macro will read the x of the foreground console). */
2439         myx = vc->vc_x;
2440
2441         if (!vc_cons_allocated(fg_console)) {
2442                 /* impossible */
2443                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2444                 goto quit;
2445         }
2446
2447         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2448                 goto quit;
2449
2450         /* undraw cursor first */
2451         if (IS_FG(vc))
2452                 hide_cursor(vc);
2453
2454         start = (ushort *)vc->vc_pos;
2455
2456         /* Contrived structure to try to emulate original need_wrap behaviour
2457          * Problems caused when we have need_wrap set on '\n' character */
2458         while (count--) {
2459                 c = *b++;
2460                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2461                         if (cnt > 0) {
2462                                 if (CON_IS_VISIBLE(vc))
2463                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2464                                 vc->vc_x += cnt;
2465                                 if (vc->vc_need_wrap)
2466                                         vc->vc_x--;
2467                                 cnt = 0;
2468                         }
2469                         if (c == 8) {           /* backspace */
2470                                 bs(vc);
2471                                 start = (ushort *)vc->vc_pos;
2472                                 myx = vc->vc_x;
2473                                 continue;
2474                         }
2475                         if (c != 13)
2476                                 lf(vc);
2477                         cr(vc);
2478                         start = (ushort *)vc->vc_pos;
2479                         myx = vc->vc_x;
2480                         if (c == 10 || c == 13)
2481                                 continue;
2482                 }
2483                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2484                 notify_write(vc, c);
2485                 cnt++;
2486                 if (myx == vc->vc_cols - 1) {
2487                         vc->vc_need_wrap = 1;
2488                         continue;
2489                 }
2490                 vc->vc_pos += 2;
2491                 myx++;
2492         }
2493         if (cnt > 0) {
2494                 if (CON_IS_VISIBLE(vc))
2495                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2496                 vc->vc_x += cnt;
2497                 if (vc->vc_x == vc->vc_cols) {
2498                         vc->vc_x--;
2499                         vc->vc_need_wrap = 1;
2500                 }
2501         }
2502         set_cursor(vc);
2503         notify_update(vc);
2504
2505 quit:
2506         spin_unlock(&printing_lock);
2507 }
2508
2509 static struct tty_driver *vt_console_device(struct console *c, int *index)
2510 {
2511         *index = c->index ? c->index-1 : fg_console;
2512         return console_driver;
2513 }
2514
2515 static struct console vt_console_driver = {
2516         .name           = "tty",
2517         .write          = vt_console_print,
2518         .device         = vt_console_device,
2519         .unblank        = unblank_screen,
2520         .flags          = CON_PRINTBUFFER,
2521         .index          = -1,
2522 };
2523 #endif
2524
2525 /*
2526  *      Handling of Linux-specific VC ioctls
2527  */
2528
2529 /*
2530  * Generally a bit racy with respect to console_lock();.
2531  *
2532  * There are some functions which don't need it.
2533  *
2534  * There are some functions which can sleep for arbitrary periods
2535  * (paste_selection) but we don't need the lock there anyway.
2536  *
2537  * set_selection has locking, and definitely needs it
2538  */
2539
2540 int tioclinux(struct tty_struct *tty, unsigned long arg)
2541 {
2542         char type, data;
2543         char __user *p = (char __user *)arg;
2544         int lines;
2545         int ret;
2546
2547         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2548                 return -EPERM;
2549         if (get_user(type, p))
2550                 return -EFAULT;
2551         ret = 0;
2552
2553         switch (type)
2554         {
2555                 case TIOCL_SETSEL:
2556                         console_lock();
2557                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2558                         console_unlock();
2559                         break;
2560                 case TIOCL_PASTESEL:
2561                         ret = paste_selection(tty);
2562                         break;
2563                 case TIOCL_UNBLANKSCREEN:
2564                         console_lock();
2565                         unblank_screen();
2566                         console_unlock();
2567                         break;
2568                 case TIOCL_SELLOADLUT:
2569                         console_lock();
2570                         ret = sel_loadlut(p);
2571                         console_unlock();
2572                         break;
2573                 case TIOCL_GETSHIFTSTATE:
2574
2575         /*
2576          * Make it possible to react to Shift+Mousebutton.
2577          * Note that 'shift_state' is an undocumented
2578          * kernel-internal variable; programs not closely
2579          * related to the kernel should not use this.
2580          */
2581                         data = vt_get_shift_state();
2582                         ret = __put_user(data, p);
2583                         break;
2584                 case TIOCL_GETMOUSEREPORTING:
2585                         console_lock(); /* May be overkill */
2586                         data = mouse_reporting();
2587                         console_unlock();
2588                         ret = __put_user(data, p);
2589                         break;
2590                 case TIOCL_SETVESABLANK:
2591                         console_lock();
2592                         ret = set_vesa_blanking(p);
2593                         console_unlock();
2594                         break;
2595                 case TIOCL_GETKMSGREDIRECT:
2596                         data = vt_get_kmsg_redirect();
2597                         ret = __put_user(data, p);
2598                         break;
2599                 case TIOCL_SETKMSGREDIRECT:
2600                         if (!capable(CAP_SYS_ADMIN)) {
2601                                 ret = -EPERM;
2602                         } else {
2603                                 if (get_user(data, p+1))
2604                                         ret = -EFAULT;
2605                                 else
2606                                         vt_kmsg_redirect(data);
2607                         }
2608                         break;
2609                 case TIOCL_GETFGCONSOLE:
2610                         /* No locking needed as this is a transiently
2611                            correct return anyway if the caller hasn't
2612                            disabled switching */
2613                         ret = fg_console;
2614                         break;
2615                 case TIOCL_SCROLLCONSOLE:
2616                         if (get_user(lines, (s32 __user *)(p+4))) {
2617                                 ret = -EFAULT;
2618                         } else {
2619                                 /* Need the console lock here. Note that lots
2620                                    of other calls need fixing before the lock
2621                                    is actually useful ! */
2622                                 console_lock();
2623                                 scrollfront(vc_cons[fg_console].d, lines);
2624                                 console_unlock();
2625                                 ret = 0;
2626                         }
2627                         break;
2628                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2629                         console_lock();
2630                         ignore_poke = 1;
2631                         do_blank_screen(0);
2632                         console_unlock();
2633                         break;
2634                 case TIOCL_BLANKEDSCREEN:
2635                         ret = console_blanked;
2636                         break;
2637                 default:
2638                         ret = -EINVAL;
2639                         break;
2640         }
2641         return ret;
2642 }
2643
2644 /*
2645  * /dev/ttyN handling
2646  */
2647
2648 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2649 {
2650         int     retval;
2651
2652         retval = do_con_write(tty, buf, count);
2653         con_flush_chars(tty);
2654
2655         return retval;
2656 }
2657
2658 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2659 {
2660         if (in_interrupt())
2661                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2662         return do_con_write(tty, &ch, 1);
2663 }
2664
2665 static int con_write_room(struct tty_struct *tty)
2666 {
2667         if (tty->stopped)
2668                 return 0;
2669         return 32768;           /* No limit, really; we're not buffering */
2670 }
2671
2672 static int con_chars_in_buffer(struct tty_struct *tty)
2673 {
2674         return 0;               /* we're not buffering */
2675 }
2676
2677 /*
2678  * con_throttle and con_unthrottle are only used for
2679  * paste_selection(), which has to stuff in a large number of
2680  * characters...
2681  */
2682 static void con_throttle(struct tty_struct *tty)
2683 {
2684 }
2685
2686 static void con_unthrottle(struct tty_struct *tty)
2687 {
2688         struct vc_data *vc = tty->driver_data;
2689
2690         wake_up_interruptible(&vc->paste_wait);
2691 }
2692
2693 /*
2694  * Turn the Scroll-Lock LED on when the tty is stopped
2695  */
2696 static void con_stop(struct tty_struct *tty)
2697 {
2698         int console_num;
2699         if (!tty)
2700                 return;
2701         console_num = tty->index;
2702         if (!vc_cons_allocated(console_num))
2703                 return;
2704         vt_kbd_con_stop(console_num);
2705 }
2706
2707 /*
2708  * Turn the Scroll-Lock LED off when the console is started
2709  */
2710 static void con_start(struct tty_struct *tty)
2711 {
2712         int console_num;
2713         if (!tty)
2714                 return;
2715         console_num = tty->index;
2716         if (!vc_cons_allocated(console_num))
2717                 return;
2718         vt_kbd_con_start(console_num);
2719 }
2720
2721 static void con_flush_chars(struct tty_struct *tty)
2722 {
2723         struct vc_data *vc;
2724
2725         if (in_interrupt())     /* from flush_to_ldisc */
2726                 return;
2727
2728         /* if we race with con_close(), vt may be null */
2729         console_lock();
2730         vc = tty->driver_data;
2731         if (vc)
2732                 set_cursor(vc);
2733         console_unlock();
2734 }
2735
2736 /*
2737  * Allocate the console screen memory.
2738  */
2739 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2740 {
2741         unsigned int currcons = tty->index;
2742         struct vc_data *vc;
2743         int ret;
2744
2745         console_lock();
2746         ret = vc_allocate(currcons);
2747         if (ret)
2748                 goto unlock;
2749
2750         vc = vc_cons[currcons].d;
2751
2752         /* Still being freed */
2753         if (vc->port.tty) {
2754                 ret = -ERESTARTSYS;
2755                 goto unlock;
2756         }
2757
2758         ret = tty_port_install(&vc->port, driver, tty);
2759         if (ret)
2760                 goto unlock;
2761
2762         tty->driver_data = vc;
2763         vc->port.tty = tty;
2764
2765         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2766                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2767                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2768         }
2769         if (vc->vc_utf)
2770                 tty->termios.c_iflag |= IUTF8;
2771         else
2772                 tty->termios.c_iflag &= ~IUTF8;
2773 unlock:
2774         console_unlock();
2775         return ret;
2776 }
2777
2778 static int con_open(struct tty_struct *tty, struct file *filp)
2779 {
2780         /* everything done in install */
2781         return 0;
2782 }
2783
2784
2785 static void con_close(struct tty_struct *tty, struct file *filp)
2786 {
2787         /* Nothing to do - we defer to shutdown */
2788 }
2789
2790 static void con_shutdown(struct tty_struct *tty)
2791 {
2792         struct vc_data *vc = tty->driver_data;
2793         BUG_ON(vc == NULL);
2794         console_lock();
2795         vc->port.tty = NULL;
2796         console_unlock();
2797 }
2798
2799 static int default_color           = 7; /* white */
2800 static int default_italic_color    = 2; // green (ASCII)
2801 static int default_underline_color = 3; // cyan (ASCII)
2802 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2803 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2804 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2805
2806 static void vc_init(struct vc_data *vc, unsigned int rows,
2807                     unsigned int cols, int do_clear)
2808 {
2809         int j, k ;
2810
2811         vc->vc_cols = cols;
2812         vc->vc_rows = rows;
2813         vc->vc_size_row = cols << 1;
2814         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2815
2816         set_origin(vc);
2817         vc->vc_pos = vc->vc_origin;
2818         reset_vc(vc);
2819         for (j=k=0; j<16; j++) {
2820                 vc->vc_palette[k++] = default_red[j] ;
2821                 vc->vc_palette[k++] = default_grn[j] ;
2822                 vc->vc_palette[k++] = default_blu[j] ;
2823         }
2824         vc->vc_def_color       = default_color;
2825         vc->vc_ulcolor         = default_underline_color;
2826         vc->vc_itcolor         = default_italic_color;
2827         vc->vc_halfcolor       = 0x08;   /* grey */
2828         init_waitqueue_head(&vc->paste_wait);
2829         reset_terminal(vc, do_clear);
2830 }
2831
2832 /*
2833  * This routine initializes console interrupts, and does nothing
2834  * else. If you want the screen to clear, call tty_write with
2835  * the appropriate escape-sequence.
2836  */
2837
2838 static int __init con_init(void)
2839 {
2840         const char *display_desc = NULL;
2841         struct vc_data *vc;
2842         unsigned int currcons = 0, i;
2843
2844         console_lock();
2845
2846         if (conswitchp)
2847                 display_desc = conswitchp->con_startup();
2848         if (!display_desc) {
2849                 fg_console = 0;
2850                 console_unlock();
2851                 return 0;
2852         }
2853
2854         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2855                 struct con_driver *con_driver = &registered_con_driver[i];
2856
2857                 if (con_driver->con == NULL) {
2858                         con_driver->con = conswitchp;
2859                         con_driver->desc = display_desc;
2860                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2861                         con_driver->first = 0;
2862                         con_driver->last = MAX_NR_CONSOLES - 1;
2863                         break;
2864                 }
2865         }
2866
2867         for (i = 0; i < MAX_NR_CONSOLES; i++)
2868                 con_driver_map[i] = conswitchp;
2869
2870         if (blankinterval) {
2871                 blank_state = blank_normal_wait;
2872                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2873         }
2874
2875         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2876                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2877                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2878                 tty_port_init(&vc->port);
2879                 visual_init(vc, currcons, 1);
2880                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2881                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2882                         currcons || !vc->vc_sw->con_save_screen);
2883         }
2884         currcons = fg_console = 0;
2885         master_display_fg = vc = vc_cons[currcons].d;
2886         set_origin(vc);
2887         save_screen(vc);
2888         gotoxy(vc, vc->vc_x, vc->vc_y);
2889         csi_J(vc, 0);
2890         update_screen(vc);
2891         pr_info("Console: %s %s %dx%d\n",
2892                 vc->vc_can_do_color ? "colour" : "mono",
2893                 display_desc, vc->vc_cols, vc->vc_rows);
2894         printable = 1;
2895
2896         console_unlock();
2897
2898 #ifdef CONFIG_VT_CONSOLE
2899         register_console(&vt_console_driver);
2900 #endif
2901         return 0;
2902 }
2903 console_initcall(con_init);
2904
2905 static const struct tty_operations con_ops = {
2906         .install = con_install,
2907         .open = con_open,
2908         .close = con_close,
2909         .write = con_write,
2910         .write_room = con_write_room,
2911         .put_char = con_put_char,
2912         .flush_chars = con_flush_chars,
2913         .chars_in_buffer = con_chars_in_buffer,
2914         .ioctl = vt_ioctl,
2915 #ifdef CONFIG_COMPAT
2916         .compat_ioctl = vt_compat_ioctl,
2917 #endif
2918         .stop = con_stop,
2919         .start = con_start,
2920         .throttle = con_throttle,
2921         .unthrottle = con_unthrottle,
2922         .resize = vt_resize,
2923         .shutdown = con_shutdown
2924 };
2925
2926 static struct cdev vc0_cdev;
2927
2928 static ssize_t show_tty_active(struct device *dev,
2929                                 struct device_attribute *attr, char *buf)
2930 {
2931         return sprintf(buf, "tty%d\n", fg_console + 1);
2932 }
2933 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2934
2935 int __init vty_init(const struct file_operations *console_fops)
2936 {
2937         cdev_init(&vc0_cdev, console_fops);
2938         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2939             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2940                 panic("Couldn't register /dev/tty0 driver\n");
2941         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2942         if (IS_ERR(tty0dev))
2943                 tty0dev = NULL;
2944         else
2945                 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2946
2947         vcs_init();
2948
2949         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2950         if (!console_driver)
2951                 panic("Couldn't allocate console driver\n");
2952
2953         console_driver->name = "tty";
2954         console_driver->name_base = 1;
2955         console_driver->major = TTY_MAJOR;
2956         console_driver->minor_start = 1;
2957         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2958         console_driver->init_termios = tty_std_termios;
2959         if (default_utf8)
2960                 console_driver->init_termios.c_iflag |= IUTF8;
2961         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2962         tty_set_operations(console_driver, &con_ops);
2963         if (tty_register_driver(console_driver))
2964                 panic("Couldn't register console driver\n");
2965         kbd_init();
2966         console_map_init();
2967 #ifdef CONFIG_MDA_CONSOLE
2968         mda_console_init();
2969 #endif
2970         return 0;
2971 }
2972
2973 #ifndef VT_SINGLE_DRIVER
2974
2975 static struct class *vtconsole_class;
2976
2977 static int do_bind_con_driver(const struct consw *csw, int first, int last,
2978                            int deflt)
2979 {
2980         struct module *owner = csw->owner;
2981         const char *desc = NULL;
2982         struct con_driver *con_driver;
2983         int i, j = -1, k = -1, retval = -ENODEV;
2984
2985         if (!try_module_get(owner))
2986                 return -ENODEV;
2987
2988         WARN_CONSOLE_UNLOCKED();
2989
2990         /* check if driver is registered */
2991         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2992                 con_driver = &registered_con_driver[i];
2993
2994                 if (con_driver->con == csw) {
2995                         desc = con_driver->desc;
2996                         retval = 0;
2997                         break;
2998                 }
2999         }
3000
3001         if (retval)
3002                 goto err;
3003
3004         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3005                 csw->con_startup();
3006                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3007         }
3008
3009         if (deflt) {
3010                 if (conswitchp)
3011                         module_put(conswitchp->owner);
3012
3013                 __module_get(owner);
3014                 conswitchp = csw;
3015         }
3016
3017         first = max(first, con_driver->first);
3018         last = min(last, con_driver->last);
3019
3020         for (i = first; i <= last; i++) {
3021                 int old_was_color;
3022                 struct vc_data *vc = vc_cons[i].d;
3023
3024                 if (con_driver_map[i])
3025                         module_put(con_driver_map[i]->owner);
3026                 __module_get(owner);
3027                 con_driver_map[i] = csw;
3028
3029                 if (!vc || !vc->vc_sw)
3030                         continue;
3031
3032                 j = i;
3033
3034                 if (CON_IS_VISIBLE(vc)) {
3035                         k = i;
3036                         save_screen(vc);
3037                 }
3038
3039                 old_was_color = vc->vc_can_do_color;
3040                 vc->vc_sw->con_deinit(vc);
3041                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3042                 visual_init(vc, i, 0);
3043                 set_origin(vc);
3044                 update_attr(vc);
3045
3046                 /* If the console changed between mono <-> color, then
3047                  * the attributes in the screenbuf will be wrong.  The
3048                  * following resets all attributes to something sane.
3049                  */
3050                 if (old_was_color != vc->vc_can_do_color)
3051                         clear_buffer_attributes(vc);
3052         }
3053
3054         pr_info("Console: switching ");
3055         if (!deflt)
3056                 printk("consoles %d-%d ", first+1, last+1);
3057         if (j >= 0) {
3058                 struct vc_data *vc = vc_cons[j].d;
3059
3060                 printk("to %s %s %dx%d\n",
3061                        vc->vc_can_do_color ? "colour" : "mono",
3062                        desc, vc->vc_cols, vc->vc_rows);
3063
3064                 if (k >= 0) {
3065                         vc = vc_cons[k].d;
3066                         update_screen(vc);
3067                 }
3068         } else
3069                 printk("to %s\n", desc);
3070
3071         retval = 0;
3072 err:
3073         module_put(owner);
3074         return retval;
3075 };
3076
3077
3078 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3079 static int con_is_graphics(const struct consw *csw, int first, int last)
3080 {
3081         int i, retval = 0;
3082
3083         for (i = first; i <= last; i++) {
3084                 struct vc_data *vc = vc_cons[i].d;
3085
3086                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3087                         retval = 1;
3088                         break;
3089                 }
3090         }
3091
3092         return retval;
3093 }
3094
3095 /* unlocked version of unbind_con_driver() */
3096 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3097 {
3098         struct module *owner = csw->owner;
3099         const struct consw *defcsw = NULL;
3100         struct con_driver *con_driver = NULL, *con_back = NULL;
3101         int i, retval = -ENODEV;
3102
3103         if (!try_module_get(owner))
3104                 return -ENODEV;
3105
3106         WARN_CONSOLE_UNLOCKED();
3107
3108         /* check if driver is registered and if it is unbindable */
3109         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3110                 con_driver = &registered_con_driver[i];
3111
3112                 if (con_driver->con == csw &&
3113                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3114                         retval = 0;
3115                         break;
3116                 }
3117         }
3118
3119         if (retval)
3120                 goto err;
3121
3122         retval = -ENODEV;
3123
3124         /* check if backup driver exists */
3125         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3126                 con_back = &registered_con_driver[i];
3127
3128                 if (con_back->con &&
3129                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3130                         defcsw = con_back->con;
3131                         retval = 0;
3132                         break;
3133                 }
3134         }
3135
3136         if (retval)
3137                 goto err;
3138
3139         if (!con_is_bound(csw))
3140                 goto err;
3141
3142         first = max(first, con_driver->first);
3143         last = min(last, con_driver->last);
3144
3145         for (i = first; i <= last; i++) {
3146                 if (con_driver_map[i] == csw) {
3147                         module_put(csw->owner);
3148                         con_driver_map[i] = NULL;
3149                 }
3150         }
3151
3152         if (!con_is_bound(defcsw)) {
3153                 const struct consw *defconsw = conswitchp;
3154
3155                 defcsw->con_startup();
3156                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3157                 /*
3158                  * vgacon may change the default driver to point
3159                  * to dummycon, we restore it here...
3160                  */
3161                 conswitchp = defconsw;
3162         }
3163
3164         if (!con_is_bound(csw))
3165                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3166
3167         /* ignore return value, binding should not fail */
3168         do_bind_con_driver(defcsw, first, last, deflt);
3169 err:
3170         module_put(owner);
3171         return retval;
3172
3173 }
3174 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3175
3176 static int vt_bind(struct con_driver *con)
3177 {
3178         const struct consw *defcsw = NULL, *csw = NULL;
3179         int i, more = 1, first = -1, last = -1, deflt = 0;
3180
3181         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3182             con_is_graphics(con->con, con->first, con->last))
3183                 goto err;
3184
3185         csw = con->con;
3186
3187         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3188                 struct con_driver *con = &registered_con_driver[i];
3189
3190                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3191                         defcsw = con->con;
3192                         break;
3193                 }
3194         }
3195
3196         if (!defcsw)
3197                 goto err;
3198
3199         while (more) {
3200                 more = 0;
3201
3202                 for (i = con->first; i <= con->last; i++) {
3203                         if (con_driver_map[i] == defcsw) {
3204                                 if (first == -1)
3205                                         first = i;
3206                                 last = i;
3207                                 more = 1;
3208                         } else if (first != -1)
3209                                 break;
3210                 }
3211
3212                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3213                         deflt = 1;
3214
3215                 if (first != -1) {
3216                         console_lock();
3217                         do_bind_con_driver(csw, first, last, deflt);
3218                         console_unlock();
3219                 }
3220
3221                 first = -1;
3222                 last = -1;
3223                 deflt = 0;
3224         }
3225
3226 err:
3227         return 0;
3228 }
3229
3230 static int vt_unbind(struct con_driver *con)
3231 {
3232         const struct consw *csw = NULL;
3233         int i, more = 1, first = -1, last = -1, deflt = 0;
3234
3235         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3236             con_is_graphics(con->con, con->first, con->last))
3237                 goto err;
3238
3239         csw = con->con;
3240
3241         while (more) {
3242                 more = 0;
3243
3244                 for (i = con->first; i <= con->last; i++) {
3245                         if (con_driver_map[i] == csw) {
3246                                 if (first == -1)
3247                                         first = i;
3248                                 last = i;
3249                                 more = 1;
3250                         } else if (first != -1)
3251                                 break;
3252                 }
3253
3254                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3255                         deflt = 1;
3256
3257                 if (first != -1) {
3258                         console_lock();
3259                         do_unbind_con_driver(csw, first, last, deflt);
3260                         console_unlock();
3261                 }
3262
3263                 first = -1;
3264                 last = -1;
3265                 deflt = 0;
3266         }
3267
3268 err:
3269         return 0;
3270 }
3271 #else
3272 static inline int vt_bind(struct con_driver *con)
3273 {
3274         return 0;
3275 }
3276 static inline int vt_unbind(struct con_driver *con)
3277 {
3278         return 0;
3279 }
3280 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3281
3282 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3283                           const char *buf, size_t count)
3284 {
3285         struct con_driver *con = dev_get_drvdata(dev);
3286         int bind = simple_strtoul(buf, NULL, 0);
3287
3288         if (bind)
3289                 vt_bind(con);
3290         else
3291                 vt_unbind(con);
3292
3293         return count;
3294 }
3295
3296 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3297                          char *buf)
3298 {
3299         struct con_driver *con = dev_get_drvdata(dev);
3300         int bind = con_is_bound(con->con);
3301
3302         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3303 }
3304
3305 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3306                          char *buf)
3307 {
3308         struct con_driver *con = dev_get_drvdata(dev);
3309
3310         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3311                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3312                          con->desc);
3313
3314 }
3315
3316 static struct device_attribute device_attrs[] = {
3317         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3318         __ATTR(name, S_IRUGO, show_name, NULL),
3319 };
3320
3321 static int vtconsole_init_device(struct con_driver *con)
3322 {
3323         int i;
3324         int error = 0;
3325
3326         con->flag |= CON_DRIVER_FLAG_ATTR;
3327         dev_set_drvdata(con->dev, con);
3328         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3329                 error = device_create_file(con->dev, &device_attrs[i]);
3330                 if (error)
3331                         break;
3332         }
3333
3334         if (error) {
3335                 while (--i >= 0)
3336                         device_remove_file(con->dev, &device_attrs[i]);
3337                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3338         }
3339
3340         return error;
3341 }
3342
3343 static void vtconsole_deinit_device(struct con_driver *con)
3344 {
3345         int i;
3346
3347         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3348                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3349                         device_remove_file(con->dev, &device_attrs[i]);
3350                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3351         }
3352 }
3353
3354 /**
3355  * con_is_bound - checks if driver is bound to the console
3356  * @csw: console driver
3357  *
3358  * RETURNS: zero if unbound, nonzero if bound
3359  *
3360  * Drivers can call this and if zero, they should release
3361  * all resources allocated on con_startup()
3362  */
3363 int con_is_bound(const struct consw *csw)
3364 {
3365         int i, bound = 0;
3366
3367         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3368                 if (con_driver_map[i] == csw) {
3369                         bound = 1;
3370                         break;
3371                 }
3372         }
3373
3374         return bound;
3375 }
3376 EXPORT_SYMBOL(con_is_bound);
3377
3378 /**
3379  * con_debug_enter - prepare the console for the kernel debugger
3380  * @sw: console driver
3381  *
3382  * Called when the console is taken over by the kernel debugger, this
3383  * function needs to save the current console state, then put the console
3384  * into a state suitable for the kernel debugger.
3385  *
3386  * RETURNS:
3387  * Zero on success, nonzero if a failure occurred when trying to prepare
3388  * the console for the debugger.
3389  */
3390 int con_debug_enter(struct vc_data *vc)
3391 {
3392         int ret = 0;
3393
3394         saved_fg_console = fg_console;
3395         saved_last_console = last_console;
3396         saved_want_console = want_console;
3397         saved_vc_mode = vc->vc_mode;
3398         saved_console_blanked = console_blanked;
3399         vc->vc_mode = KD_TEXT;
3400         console_blanked = 0;
3401         if (vc->vc_sw->con_debug_enter)
3402                 ret = vc->vc_sw->con_debug_enter(vc);
3403 #ifdef CONFIG_KGDB_KDB
3404         /* Set the initial LINES variable if it is not already set */
3405         if (vc->vc_rows < 999) {
3406                 int linecount;
3407                 char lns[4];
3408                 const char *setargs[3] = {
3409                         "set",
3410                         "LINES",
3411                         lns,
3412                 };
3413                 if (kdbgetintenv(setargs[0], &linecount)) {
3414                         snprintf(lns, 4, "%i", vc->vc_rows);
3415                         kdb_set(2, setargs);
3416                 }
3417         }
3418         if (vc->vc_cols < 999) {
3419                 int colcount;
3420                 char cols[4];
3421                 const char *setargs[3] = {
3422                         "set",
3423                         "COLUMNS",
3424                         cols,
3425                 };
3426                 if (kdbgetintenv(setargs[0], &colcount)) {
3427                         snprintf(cols, 4, "%i", vc->vc_cols);
3428                         kdb_set(2, setargs);
3429                 }
3430         }
3431 #endif /* CONFIG_KGDB_KDB */
3432         return ret;
3433 }
3434 EXPORT_SYMBOL_GPL(con_debug_enter);
3435
3436 /**
3437  * con_debug_leave - restore console state
3438  * @sw: console driver
3439  *
3440  * Restore the console state to what it was before the kernel debugger
3441  * was invoked.
3442  *
3443  * RETURNS:
3444  * Zero on success, nonzero if a failure occurred when trying to restore
3445  * the console.
3446  */
3447 int con_debug_leave(void)
3448 {
3449         struct vc_data *vc;
3450         int ret = 0;
3451
3452         fg_console = saved_fg_console;
3453         last_console = saved_last_console;
3454         want_console = saved_want_console;
3455         console_blanked = saved_console_blanked;
3456         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3457
3458         vc = vc_cons[fg_console].d;
3459         if (vc->vc_sw->con_debug_leave)
3460                 ret = vc->vc_sw->con_debug_leave(vc);
3461         return ret;
3462 }
3463 EXPORT_SYMBOL_GPL(con_debug_leave);
3464
3465 static int do_register_con_driver(const struct consw *csw, int first, int last)
3466 {
3467         struct module *owner = csw->owner;
3468         struct con_driver *con_driver;
3469         const char *desc;
3470         int i, retval = 0;
3471
3472         WARN_CONSOLE_UNLOCKED();
3473
3474         if (!try_module_get(owner))
3475                 return -ENODEV;
3476
3477         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3478                 con_driver = &registered_con_driver[i];
3479
3480                 /* already registered */
3481                 if (con_driver->con == csw)
3482                         retval = -EBUSY;
3483         }
3484
3485         if (retval)
3486                 goto err;
3487
3488         desc = csw->con_startup();
3489
3490         if (!desc)
3491                 goto err;
3492
3493         retval = -EINVAL;
3494
3495         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3496                 con_driver = &registered_con_driver[i];
3497
3498                 if (con_driver->con == NULL) {
3499                         con_driver->con = csw;
3500                         con_driver->desc = desc;
3501                         con_driver->node = i;
3502                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3503                                            CON_DRIVER_FLAG_INIT;
3504                         con_driver->first = first;
3505                         con_driver->last = last;
3506                         retval = 0;
3507                         break;
3508                 }
3509         }
3510
3511         if (retval)
3512                 goto err;
3513
3514         con_driver->dev = device_create(vtconsole_class, NULL,
3515                                                 MKDEV(0, con_driver->node),
3516                                                 NULL, "vtcon%i",
3517                                                 con_driver->node);
3518
3519         if (IS_ERR(con_driver->dev)) {
3520                 printk(KERN_WARNING "Unable to create device for %s; "
3521                        "errno = %ld\n", con_driver->desc,
3522                        PTR_ERR(con_driver->dev));
3523                 con_driver->dev = NULL;
3524         } else {
3525                 vtconsole_init_device(con_driver);
3526         }
3527
3528 err:
3529         module_put(owner);
3530         return retval;
3531 }
3532
3533
3534 /**
3535  * do_unregister_con_driver - unregister console driver from console layer
3536  * @csw: console driver
3537  *
3538  * DESCRIPTION: All drivers that registers to the console layer must
3539  * call this function upon exit, or if the console driver is in a state
3540  * where it won't be able to handle console services, such as the
3541  * framebuffer console without loaded framebuffer drivers.
3542  *
3543  * The driver must unbind first prior to unregistration.
3544  */
3545 int do_unregister_con_driver(const struct consw *csw)
3546 {
3547         int i, retval = -ENODEV;
3548
3549         /* cannot unregister a bound driver */
3550         if (con_is_bound(csw))
3551                 goto err;
3552
3553         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3554                 struct con_driver *con_driver = &registered_con_driver[i];
3555
3556                 if (con_driver->con == csw &&
3557                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3558                         vtconsole_deinit_device(con_driver);
3559                         device_destroy(vtconsole_class,
3560                                        MKDEV(0, con_driver->node));
3561                         con_driver->con = NULL;
3562                         con_driver->desc = NULL;
3563                         con_driver->dev = NULL;
3564                         con_driver->node = 0;
3565                         con_driver->flag = 0;
3566                         con_driver->first = 0;
3567                         con_driver->last = 0;
3568                         retval = 0;
3569                         break;
3570                 }
3571         }
3572 err:
3573         return retval;
3574 }
3575 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3576
3577 /*
3578  *      If we support more console drivers, this function is used
3579  *      when a driver wants to take over some existing consoles
3580  *      and become default driver for newly opened ones.
3581  *
3582  *      do_take_over_console is basically a register followed by unbind
3583  */
3584 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3585 {
3586         int err;
3587
3588         err = do_register_con_driver(csw, first, last);
3589         /*
3590          * If we get an busy error we still want to bind the console driver
3591          * and return success, as we may have unbound the console driver
3592          * but not unregistered it.
3593          */
3594         if (err == -EBUSY)
3595                 err = 0;
3596         if (!err)
3597                 do_bind_con_driver(csw, first, last, deflt);
3598
3599         return err;
3600 }
3601 EXPORT_SYMBOL_GPL(do_take_over_console);
3602
3603
3604 /*
3605  * give_up_console is a wrapper to unregister_con_driver. It will only
3606  * work if driver is fully unbound.
3607  */
3608 void give_up_console(const struct consw *csw)
3609 {
3610         console_lock();
3611         do_unregister_con_driver(csw);
3612         console_unlock();
3613 }
3614
3615 static int __init vtconsole_class_init(void)
3616 {
3617         int i;
3618
3619         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3620         if (IS_ERR(vtconsole_class)) {
3621                 printk(KERN_WARNING "Unable to create vt console class; "
3622                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3623                 vtconsole_class = NULL;
3624         }
3625
3626         /* Add system drivers to sysfs */
3627         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3628                 struct con_driver *con = &registered_con_driver[i];
3629
3630                 if (con->con && !con->dev) {
3631                         con->dev = device_create(vtconsole_class, NULL,
3632                                                          MKDEV(0, con->node),
3633                                                          NULL, "vtcon%i",
3634                                                          con->node);
3635
3636                         if (IS_ERR(con->dev)) {
3637                                 printk(KERN_WARNING "Unable to create "
3638                                        "device for %s; errno = %ld\n",
3639                                        con->desc, PTR_ERR(con->dev));
3640                                 con->dev = NULL;
3641                         } else {
3642                                 vtconsole_init_device(con);
3643                         }
3644                 }
3645         }
3646
3647         return 0;
3648 }
3649 postcore_initcall(vtconsole_class_init);
3650
3651 #endif
3652
3653 /*
3654  *      Screen blanking
3655  */
3656
3657 static int set_vesa_blanking(char __user *p)
3658 {
3659         unsigned int mode;
3660
3661         if (get_user(mode, p + 1))
3662                 return -EFAULT;
3663
3664         vesa_blank_mode = (mode < 4) ? mode : 0;
3665         return 0;
3666 }
3667
3668 void do_blank_screen(int entering_gfx)
3669 {
3670         struct vc_data *vc = vc_cons[fg_console].d;
3671         int i;
3672
3673         WARN_CONSOLE_UNLOCKED();
3674
3675         if (console_blanked) {
3676                 if (blank_state == blank_vesa_wait) {
3677                         blank_state = blank_off;
3678                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3679                 }
3680                 return;
3681         }
3682
3683         /* entering graphics mode? */
3684         if (entering_gfx) {
3685                 hide_cursor(vc);
3686                 save_screen(vc);
3687                 vc->vc_sw->con_blank(vc, -1, 1);
3688                 console_blanked = fg_console + 1;
3689                 blank_state = blank_off;
3690                 set_origin(vc);
3691                 return;
3692         }
3693
3694         if (blank_state != blank_normal_wait)
3695                 return;
3696         blank_state = blank_off;
3697
3698         /* don't blank graphics */
3699         if (vc->vc_mode != KD_TEXT) {
3700                 console_blanked = fg_console + 1;
3701                 return;
3702         }
3703
3704         hide_cursor(vc);
3705         del_timer_sync(&console_timer);
3706         blank_timer_expired = 0;
3707
3708         save_screen(vc);
3709         /* In case we need to reset origin, blanking hook returns 1 */
3710         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3711         console_blanked = fg_console + 1;
3712         if (i)
3713                 set_origin(vc);
3714
3715         if (console_blank_hook && console_blank_hook(1))
3716                 return;
3717
3718         if (vesa_off_interval && vesa_blank_mode) {
3719                 blank_state = blank_vesa_wait;
3720                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3721         }
3722         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3723 }
3724 EXPORT_SYMBOL(do_blank_screen);
3725
3726 /*
3727  * Called by timer as well as from vt_console_driver
3728  */
3729 void do_unblank_screen(int leaving_gfx)
3730 {
3731         struct vc_data *vc;
3732
3733         /* This should now always be called from a "sane" (read: can schedule)
3734          * context for the sake of the low level drivers, except in the special
3735          * case of oops_in_progress
3736          */
3737         if (!oops_in_progress)
3738                 might_sleep();
3739
3740         WARN_CONSOLE_UNLOCKED();
3741
3742         ignore_poke = 0;
3743         if (!console_blanked)
3744                 return;
3745         if (!vc_cons_allocated(fg_console)) {
3746                 /* impossible */
3747                 pr_warning("unblank_screen: tty %d not allocated ??\n",
3748                            fg_console+1);
3749                 return;
3750         }
3751         vc = vc_cons[fg_console].d;
3752         /* Try to unblank in oops case too */
3753         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3754                 return; /* but leave console_blanked != 0 */
3755
3756         if (blankinterval) {
3757                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3758                 blank_state = blank_normal_wait;
3759         }
3760
3761         console_blanked = 0;
3762         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3763                 /* Low-level driver cannot restore -> do it ourselves */
3764                 update_screen(vc);
3765         if (console_blank_hook)
3766                 console_blank_hook(0);
3767         set_palette(vc);
3768         set_cursor(vc);
3769         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3770 }
3771 EXPORT_SYMBOL(do_unblank_screen);
3772
3773 /*
3774  * This is called by the outside world to cause a forced unblank, mostly for
3775  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3776  * call it with 1 as an argument and so force a mode restore... that may kill
3777  * X or at least garbage the screen but would also make the Oops visible...
3778  */
3779 void unblank_screen(void)
3780 {
3781         do_unblank_screen(0);
3782 }
3783
3784 /*
3785  * We defer the timer blanking to work queue so it can take the console mutex
3786  * (console operations can still happen at irq time, but only from printk which
3787  * has the console mutex. Not perfect yet, but better than no locking
3788  */
3789 static void blank_screen_t(unsigned long dummy)
3790 {
3791         if (unlikely(!keventd_up())) {
3792                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3793                 return;
3794         }
3795         blank_timer_expired = 1;
3796         schedule_work(&console_work);
3797 }
3798
3799 void poke_blanked_console(void)
3800 {
3801         WARN_CONSOLE_UNLOCKED();
3802
3803         /* Add this so we quickly catch whoever might call us in a non
3804          * safe context. Nowadays, unblank_screen() isn't to be called in
3805          * atomic contexts and is allowed to schedule (with the special case
3806          * of oops_in_progress, but that isn't of any concern for this
3807          * function. --BenH.
3808          */
3809         might_sleep();
3810
3811         /* This isn't perfectly race free, but a race here would be mostly harmless,
3812          * at worse, we'll do a spurrious blank and it's unlikely
3813          */
3814         del_timer(&console_timer);
3815         blank_timer_expired = 0;
3816
3817         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3818                 return;
3819         if (console_blanked)
3820                 unblank_screen();
3821         else if (blankinterval) {
3822                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3823                 blank_state = blank_normal_wait;
3824         }
3825 }
3826
3827 /*
3828  *      Palettes
3829  */
3830
3831 static void set_palette(struct vc_data *vc)
3832 {
3833         WARN_CONSOLE_UNLOCKED();
3834
3835         if (vc->vc_mode != KD_GRAPHICS)
3836                 vc->vc_sw->con_set_palette(vc, color_table);
3837 }
3838
3839 /*
3840  * Load palette into the DAC registers. arg points to a colour
3841  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3842  */
3843
3844 int con_set_cmap(unsigned char __user *arg)
3845 {
3846         int i, j, k;
3847         unsigned char colormap[3*16];
3848
3849         if (copy_from_user(colormap, arg, sizeof(colormap)))
3850                 return -EFAULT;
3851
3852         console_lock();
3853         for (i = k = 0; i < 16; i++) {
3854                 default_red[i] = colormap[k++];
3855                 default_grn[i] = colormap[k++];
3856                 default_blu[i] = colormap[k++];
3857         }
3858         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3859                 if (!vc_cons_allocated(i))
3860                         continue;
3861                 for (j = k = 0; j < 16; j++) {
3862                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3863                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3864                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3865                 }
3866                 set_palette(vc_cons[i].d);
3867         }
3868         console_unlock();
3869
3870         return 0;
3871 }
3872
3873 int con_get_cmap(unsigned char __user *arg)
3874 {
3875         int i, k;
3876         unsigned char colormap[3*16];
3877
3878         console_lock();
3879         for (i = k = 0; i < 16; i++) {
3880                 colormap[k++] = default_red[i];
3881                 colormap[k++] = default_grn[i];
3882                 colormap[k++] = default_blu[i];
3883         }
3884         console_unlock();
3885
3886         if (copy_to_user(arg, colormap, sizeof(colormap)))
3887                 return -EFAULT;
3888
3889         return 0;
3890 }
3891
3892 void reset_palette(struct vc_data *vc)
3893 {
3894         int j, k;
3895         for (j=k=0; j<16; j++) {
3896                 vc->vc_palette[k++] = default_red[j];
3897                 vc->vc_palette[k++] = default_grn[j];
3898                 vc->vc_palette[k++] = default_blu[j];
3899         }
3900         set_palette(vc);
3901 }
3902
3903 /*
3904  *  Font switching
3905  *
3906  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3907  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3908  *  depending on width) reserved for each character which is kinda wasty, but
3909  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3910  *  is up to the actual low-level console-driver convert data into its favorite
3911  *  format (maybe we should add a `fontoffset' field to the `display'
3912  *  structure so we won't have to convert the fontdata all the time.
3913  *  /Jes
3914  */
3915
3916 #define max_font_size 65536
3917
3918 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3919 {
3920         struct console_font font;
3921         int rc = -EINVAL;
3922         int c;
3923
3924         if (op->data) {
3925                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3926                 if (!font.data)
3927                         return -ENOMEM;
3928         } else
3929                 font.data = NULL;
3930
3931         console_lock();
3932         if (vc->vc_mode != KD_TEXT)
3933                 rc = -EINVAL;
3934         else if (vc->vc_sw->con_font_get)
3935                 rc = vc->vc_sw->con_font_get(vc, &font);
3936         else
3937                 rc = -ENOSYS;
3938         console_unlock();
3939
3940         if (rc)
3941                 goto out;
3942
3943         c = (font.width+7)/8 * 32 * font.charcount;
3944
3945         if (op->data && font.charcount > op->charcount)
3946                 rc = -ENOSPC;
3947         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3948                 if (font.width > op->width || font.height > op->height)
3949                         rc = -ENOSPC;
3950         } else {
3951                 if (font.width != 8)
3952                         rc = -EIO;
3953                 else if ((op->height && font.height > op->height) ||
3954                          font.height > 32)
3955                         rc = -ENOSPC;
3956         }
3957         if (rc)
3958                 goto out;
3959
3960         op->height = font.height;
3961         op->width = font.width;
3962         op->charcount = font.charcount;
3963
3964         if (op->data && copy_to_user(op->data, font.data, c))
3965                 rc = -EFAULT;
3966
3967 out:
3968         kfree(font.data);
3969         return rc;
3970 }
3971
3972 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3973 {
3974         struct console_font font;
3975         int rc = -EINVAL;
3976         int size;
3977
3978         if (vc->vc_mode != KD_TEXT)
3979                 return -EINVAL;
3980         if (!op->data)
3981                 return -EINVAL;
3982         if (op->charcount > 512)
3983                 return -EINVAL;
3984         if (!op->height) {              /* Need to guess font height [compat] */
3985                 int h, i;
3986                 u8 __user *charmap = op->data;
3987                 u8 tmp;
3988
3989                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3990                    so that we can get rid of this soon */
3991                 if (!(op->flags & KD_FONT_FLAG_OLD))
3992                         return -EINVAL;
3993                 for (h = 32; h > 0; h--)
3994                         for (i = 0; i < op->charcount; i++) {
3995                                 if (get_user(tmp, &charmap[32*i+h-1]))
3996                                         return -EFAULT;
3997                                 if (tmp)
3998                                         goto nonzero;
3999                         }
4000                 return -EINVAL;
4001         nonzero:
4002                 op->height = h;
4003         }
4004         if (op->width <= 0 || op->width > 32 || op->height > 32)
4005                 return -EINVAL;
4006         size = (op->width+7)/8 * 32 * op->charcount;
4007         if (size > max_font_size)
4008                 return -ENOSPC;
4009         font.charcount = op->charcount;
4010         font.height = op->height;
4011         font.width = op->width;
4012         font.data = memdup_user(op->data, size);
4013         if (IS_ERR(font.data))
4014                 return PTR_ERR(font.data);
4015         console_lock();
4016         if (vc->vc_mode != KD_TEXT)
4017                 rc = -EINVAL;
4018         else if (vc->vc_sw->con_font_set)
4019                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4020         else
4021                 rc = -ENOSYS;
4022         console_unlock();
4023         kfree(font.data);
4024         return rc;
4025 }
4026
4027 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4028 {
4029         struct console_font font = {.width = op->width, .height = op->height};
4030         char name[MAX_FONT_NAME];
4031         char *s = name;
4032         int rc;
4033
4034
4035         if (!op->data)
4036                 s = NULL;
4037         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4038                 return -EFAULT;
4039         else
4040                 name[MAX_FONT_NAME - 1] = 0;
4041
4042         console_lock();
4043         if (vc->vc_mode != KD_TEXT) {
4044                 console_unlock();
4045                 return -EINVAL;
4046         }
4047         if (vc->vc_sw->con_font_default)
4048                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4049         else
4050                 rc = -ENOSYS;
4051         console_unlock();
4052         if (!rc) {
4053                 op->width = font.width;
4054                 op->height = font.height;
4055         }
4056         return rc;
4057 }
4058
4059 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4060 {
4061         int con = op->height;
4062         int rc;
4063
4064
4065         console_lock();
4066         if (vc->vc_mode != KD_TEXT)
4067                 rc = -EINVAL;
4068         else if (!vc->vc_sw->con_font_copy)
4069                 rc = -ENOSYS;
4070         else if (con < 0 || !vc_cons_allocated(con))
4071                 rc = -ENOTTY;
4072         else if (con == vc->vc_num)     /* nothing to do */
4073                 rc = 0;
4074         else
4075                 rc = vc->vc_sw->con_font_copy(vc, con);
4076         console_unlock();
4077         return rc;
4078 }
4079
4080 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4081 {
4082         switch (op->op) {
4083         case KD_FONT_OP_SET:
4084                 return con_font_set(vc, op);
4085         case KD_FONT_OP_GET:
4086                 return con_font_get(vc, op);
4087         case KD_FONT_OP_SET_DEFAULT:
4088                 return con_font_default(vc, op);
4089         case KD_FONT_OP_COPY:
4090                 return con_font_copy(vc, op);
4091         }
4092         return -ENOSYS;
4093 }
4094
4095 /*
4096  *      Interface exported to selection and vcs.
4097  */
4098
4099 /* used by selection */
4100 u16 screen_glyph(struct vc_data *vc, int offset)
4101 {
4102         u16 w = scr_readw(screenpos(vc, offset, 1));
4103         u16 c = w & 0xff;
4104
4105         if (w & vc->vc_hi_font_mask)
4106                 c |= 0x100;
4107         return c;
4108 }
4109 EXPORT_SYMBOL_GPL(screen_glyph);
4110
4111 /* used by vcs - note the word offset */
4112 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4113 {
4114         return screenpos(vc, 2 * w_offset, viewed);
4115 }
4116
4117 void getconsxy(struct vc_data *vc, unsigned char *p)
4118 {
4119         p[0] = vc->vc_x;
4120         p[1] = vc->vc_y;
4121 }
4122
4123 void putconsxy(struct vc_data *vc, unsigned char *p)
4124 {
4125         hide_cursor(vc);
4126         gotoxy(vc, p[0], p[1]);
4127         set_cursor(vc);
4128 }
4129
4130 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4131 {
4132         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4133                 return softcursor_original;
4134         return scr_readw(org);
4135 }
4136
4137 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4138 {
4139         scr_writew(val, org);
4140         if ((unsigned long)org == vc->vc_pos) {
4141                 softcursor_original = -1;
4142                 add_softcursor(vc);
4143         }
4144 }
4145
4146 void vcs_scr_updated(struct vc_data *vc)
4147 {
4148         notify_update(vc);
4149 }
4150
4151 /*
4152  *      Visible symbols for modules
4153  */
4154
4155 EXPORT_SYMBOL(color_table);
4156 EXPORT_SYMBOL(default_red);
4157 EXPORT_SYMBOL(default_grn);
4158 EXPORT_SYMBOL(default_blu);
4159 EXPORT_SYMBOL(update_region);
4160 EXPORT_SYMBOL(redraw_screen);
4161 EXPORT_SYMBOL(vc_resize);
4162 EXPORT_SYMBOL(fg_console);
4163 EXPORT_SYMBOL(console_blank_hook);
4164 EXPORT_SYMBOL(console_blanked);
4165 EXPORT_SYMBOL(vc_cons);
4166 EXPORT_SYMBOL(global_cursor_default);
4167 #ifndef VT_SINGLE_DRIVER
4168 EXPORT_SYMBOL(give_up_console);
4169 #endif