drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/tiocl.h>
  93 #include <linux/kbd_kern.h>
  94 #include <linux/consolemap.h>
  95 #include <linux/timer.h>
  96 #include <linux/interrupt.h>
  97 #include <linux/workqueue.h>
  98 #include <linux/bootmem.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103 #include <linux/device.h>
 104 #include <linux/io.h>
 105 #include <asm/system.h>
 106 #include <linux/uaccess.h>
 107 #include <linux/kmemleak.h>
 108
 109 #define MAX_NR_CON_DRIVER 16
 110
 111 #define CON_DRIVER_FLAG_MODULE 1
 112 #define CON_DRIVER_FLAG_INIT   2
 113 #define CON_DRIVER_FLAG_ATTR   4
 114
 115 struct con_driver {
 116         const struct consw *con;
 117         const char *desc;
 118         struct device *dev;
 119         int node;
 120         int first;
 121         int last;
 122         int flag;
 123 };
 124
 125 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 126 const struct consw *conswitchp;
 127
 128 /* A bitmap for codes <32. A bit of 1 indicates that the code
 129  * corresponding to that bit number invokes some special action
 130  * (such as cursor movement) and should not be displayed as a
 131  * glyph unless the disp_ctrl mode is explicitly enabled.
 132  */
 133 #define CTRL_ACTION 0x0d00ff81
 134 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 135
 136 /*
 137  * Here is the default bell parameters: 750HZ, 1/8th of a second
 138  */
 139 #define DEFAULT_BELL_PITCH      750
 140 #define DEFAULT_BELL_DURATION   (HZ/8)
 141
 142 struct vc vc_cons [MAX_NR_CONSOLES];
 143
 144 #ifndef VT_SINGLE_DRIVER
 145 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 146 #endif
 147
 148 static int con_open(struct tty_struct *, struct file *);
 149 static void vc_init(struct vc_data *vc, unsigned int rows,
 150                     unsigned int cols, int do_clear);
 151 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 152 static void save_cur(struct vc_data *vc);
 153 static void reset_terminal(struct vc_data *vc, int do_clear);
 154 static void con_flush_chars(struct tty_struct *tty);
 155 static int set_vesa_blanking(char __user *p);
 156 static void set_cursor(struct vc_data *vc);
 157 static void hide_cursor(struct vc_data *vc);
 158 static void console_callback(struct work_struct *ignored);
 159 static void blank_screen_t(unsigned long dummy);
 160 static void set_palette(struct vc_data *vc);
 161
 162 static int printable;           /* Is console ready for printing? */
 163 int default_utf8 = true;
 164 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 165
 166 /*
 167  * ignore_poke: don't unblank the screen when things are typed.  This is
 168  * mainly for the privacy of braille terminal users.
 169  */
 170 static int ignore_poke;
 171
 172 int do_poke_blanked_console;
 173 int console_blanked;
 174
 175 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 176 static int blankinterval = 10*60*HZ;
 177 static int vesa_off_interval;
 178
 179 static DECLARE_WORK(console_work, console_callback);
 180
 181 /*
 182  * fg_console is the current virtual console,
 183  * last_console is the last used one,
 184  * want_console is the console we want to switch to,
 185  * kmsg_redirect is the console for kernel messages,
 186  */
 187 int fg_console;
 188 int last_console;
 189 int want_console = -1;
 190 int kmsg_redirect;
 191
 192 /*
 193  * For each existing display, we have a pointer to console currently visible
 194  * on that display, allowing consoles other than fg_console to be refreshed
 195  * appropriately. Unless the low-level driver supplies its own display_fg
 196  * variable, we use this one for the "master display".
 197  */
 198 static struct vc_data *master_display_fg;
 199
 200 /*
 201  * Unfortunately, we need to delay tty echo when we're currently writing to the
 202  * console since the code is (and always was) not re-entrant, so we schedule
 203  * all flip requests to process context with schedule-task() and run it from
 204  * console_callback().
 205  */
 206
 207 /*
 208  * For the same reason, we defer scrollback to the console callback.
 209  */
 210 static int scrollback_delta;
 211
 212 /*
 213  * Hook so that the power management routines can (un)blank
 214  * the console on our behalf.
 215  */
 216 int (*console_blank_hook)(int);
 217
 218 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 219 static int blank_state;
 220 static int blank_timer_expired;
 221 enum {
 222         blank_off = 0,
 223         blank_normal_wait,
 224         blank_vesa_wait,
 225 };
 226
 227 /*
 228  * Notifier list for console events.
 229  */
 230 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 231
 232 int register_vt_notifier(struct notifier_block *nb)
 233 {
 234         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 235 }
 236 EXPORT_SYMBOL_GPL(register_vt_notifier);
 237
 238 int unregister_vt_notifier(struct notifier_block *nb)
 239 {
 240         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 241 }
 242 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 243
 244 static void notify_write(struct vc_data *vc, unsigned int unicode)
 245 {
 246         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 247         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 248 }
 249
 250 static void notify_update(struct vc_data *vc)
 251 {
 252         struct vt_notifier_param param = { .vc = vc };
 253         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 254 }
 255
 256 /*
 257  *      Low-Level Functions
 258  */
 259
 260 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 261
 262 #ifdef VT_BUF_VRAM_ONLY
 263 #define DO_UPDATE(vc)   0
 264 #else
 265 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 266 #endif
 267
 268 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 269 {
 270         unsigned short *p;
 271
 272         if (!viewed)
 273                 p = (unsigned short *)(vc->vc_origin + offset);
 274         else if (!vc->vc_sw->con_screen_pos)
 275                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 276         else
 277                 p = vc->vc_sw->con_screen_pos(vc, offset);
 278         return p;
 279 }
 280
 281 static inline void scrolldelta(int lines)
 282 {
 283         scrollback_delta += lines;
 284         schedule_console_callback();
 285 }
 286
 287 void schedule_console_callback(void)
 288 {
 289         schedule_work(&console_work);
 290 }
 291
 292 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 293 {
 294         unsigned short *d, *s;
 295
 296         if (t+nr >= b)
 297                 nr = b - t - 1;
 298         if (b > vc->vc_rows || t >= b || nr < 1)
 299                 return;
 300         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 301                 return;
 302         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 303         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 304         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 305         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 306                     vc->vc_size_row * nr);
 307 }
 308
 309 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 310 {
 311         unsigned short *s;
 312         unsigned int step;
 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_DOWN, nr))
 319                 return;
 320         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 321         step = vc->vc_cols * nr;
 322         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 323         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 324 }
 325
 326 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 327 {
 328 #ifndef VT_BUF_VRAM_ONLY
 329         unsigned int xx, yy, offset;
 330         u16 *p;
 331
 332         p = (u16 *) start;
 333         if (!vc->vc_sw->con_getxy) {
 334                 offset = (start - vc->vc_origin) / 2;
 335                 xx = offset % vc->vc_cols;
 336                 yy = offset / vc->vc_cols;
 337         } else {
 338                 int nxx, nyy;
 339                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 340                 xx = nxx; yy = nyy;
 341         }
 342         for(;;) {
 343                 u16 attrib = scr_readw(p) & 0xff00;
 344                 int startx = xx;
 345                 u16 *q = p;
 346                 while (xx < vc->vc_cols && count) {
 347                         if (attrib != (scr_readw(p) & 0xff00)) {
 348                                 if (p > q)
 349                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 350                                 startx = xx;
 351                                 q = p;
 352                                 attrib = scr_readw(p) & 0xff00;
 353                         }
 354                         p++;
 355                         xx++;
 356                         count--;
 357                 }
 358                 if (p > q)
 359                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 360                 if (!count)
 361                         break;
 362                 xx = 0;
 363                 yy++;
 364                 if (vc->vc_sw->con_getxy) {
 365                         p = (u16 *)start;
 366                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 367                 }
 368         }
 369 #endif
 370 }
 371
 372 void update_region(struct vc_data *vc, unsigned long start, int count)
 373 {
 374         WARN_CONSOLE_UNLOCKED();
 375
 376         if (DO_UPDATE(vc)) {
 377                 hide_cursor(vc);
 378                 do_update_region(vc, start, count);
 379                 set_cursor(vc);
 380         }
 381 }
 382
 383 /* Structure of attributes is hardware-dependent */
 384
 385 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 386     u8 _underline, u8 _reverse, u8 _italic)
 387 {
 388         if (vc->vc_sw->con_build_attr)
 389                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 390                        _blink, _underline, _reverse, _italic);
 391
 392 #ifndef VT_BUF_VRAM_ONLY
 393 /*
 394  * ++roman: I completely changed the attribute format for monochrome
 395  * mode (!can_do_color). The formerly used MDA (monochrome display
 396  * adapter) format didn't allow the combination of certain effects.
 397  * Now the attribute is just a bit vector:
 398  *  Bit 0..1: intensity (0..2)
 399  *  Bit 2   : underline
 400  *  Bit 3   : reverse
 401  *  Bit 7   : blink
 402  */
 403         {
 404         u8 a = _color;
 405         if (!vc->vc_can_do_color)
 406                 return _intensity |
 407                        (_italic ? 2 : 0) |
 408                        (_underline ? 4 : 0) |
 409                        (_reverse ? 8 : 0) |
 410                        (_blink ? 0x80 : 0);
 411         if (_italic)
 412                 a = (a & 0xF0) | vc->vc_itcolor;
 413         else if (_underline)
 414                 a = (a & 0xf0) | vc->vc_ulcolor;
 415         else if (_intensity == 0)
 416                 a = (a & 0xf0) | vc->vc_ulcolor;
 417         if (_reverse)
 418                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 419         if (_blink)
 420                 a ^= 0x80;
 421         if (_intensity == 2)
 422                 a ^= 0x08;
 423         if (vc->vc_hi_font_mask == 0x100)
 424                 a <<= 1;
 425         return a;
 426         }
 427 #else
 428         return 0;
 429 #endif
 430 }
 431
 432 static void update_attr(struct vc_data *vc)
 433 {
 434         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 435                       vc->vc_blink, vc->vc_underline,
 436                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 437         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 438 }
 439
 440 /* Note: inverting the screen twice should revert to the original state */
 441 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 442 {
 443         unsigned short *p;
 444
 445         WARN_CONSOLE_UNLOCKED();
 446
 447         count /= 2;
 448         p = screenpos(vc, offset, viewed);
 449         if (vc->vc_sw->con_invert_region)
 450                 vc->vc_sw->con_invert_region(vc, p, count);
 451 #ifndef VT_BUF_VRAM_ONLY
 452         else {
 453                 u16 *q = p;
 454                 int cnt = count;
 455                 u16 a;
 456
 457                 if (!vc->vc_can_do_color) {
 458                         while (cnt--) {
 459                             a = scr_readw(q);
 460                             a ^= 0x0800;
 461                             scr_writew(a, q);
 462                             q++;
 463                         }
 464                 } else if (vc->vc_hi_font_mask == 0x100) {
 465                         while (cnt--) {
 466                                 a = scr_readw(q);
 467                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 468                                 scr_writew(a, q);
 469                                 q++;
 470                         }
 471                 } else {
 472                         while (cnt--) {
 473                                 a = scr_readw(q);
 474                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 475                                 scr_writew(a, q);
 476                                 q++;
 477                         }
 478                 }
 479         }
 480 #endif
 481         if (DO_UPDATE(vc))
 482                 do_update_region(vc, (unsigned long) p, count);
 483 }
 484
 485 /* used by selection: complement pointer position */
 486 void complement_pos(struct vc_data *vc, int offset)
 487 {
 488         static int old_offset = -1;
 489         static unsigned short old;
 490         static unsigned short oldx, oldy;
 491
 492         WARN_CONSOLE_UNLOCKED();
 493
 494         if (old_offset != -1 && old_offset >= 0 &&
 495             old_offset < vc->vc_screenbuf_size) {
 496                 scr_writew(old, screenpos(vc, old_offset, 1));
 497                 if (DO_UPDATE(vc))
 498                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 499         }
 500
 501         old_offset = offset;
 502
 503         if (offset != -1 && offset >= 0 &&
 504             offset < vc->vc_screenbuf_size) {
 505                 unsigned short new;
 506                 unsigned short *p;
 507                 p = screenpos(vc, offset, 1);
 508                 old = scr_readw(p);
 509                 new = old ^ vc->vc_complement_mask;
 510                 scr_writew(new, p);
 511                 if (DO_UPDATE(vc)) {
 512                         oldx = (offset >> 1) % vc->vc_cols;
 513                         oldy = (offset >> 1) / vc->vc_cols;
 514                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 515                 }
 516         }
 517
 518 }
 519
 520 static void insert_char(struct vc_data *vc, unsigned int nr)
 521 {
 522         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 523
 524         p = q + vc->vc_cols - nr - vc->vc_x;
 525         while (--p >= q)
 526                 scr_writew(scr_readw(p), p + nr);
 527         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 528         vc->vc_need_wrap = 0;
 529         if (DO_UPDATE(vc)) {
 530                 unsigned short oldattr = vc->vc_attr;
 531                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 532                                      vc->vc_cols - vc->vc_x - nr);
 533                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 534                 while (nr--)
 535                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 536                 vc->vc_attr = oldattr;
 537         }
 538 }
 539
 540 static void delete_char(struct vc_data *vc, unsigned int nr)
 541 {
 542         unsigned int i = vc->vc_x;
 543         unsigned short *p = (unsigned short *)vc->vc_pos;
 544
 545         while (++i <= vc->vc_cols - nr) {
 546                 scr_writew(scr_readw(p+nr), p);
 547                 p++;
 548         }
 549         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 550         vc->vc_need_wrap = 0;
 551         if (DO_UPDATE(vc)) {
 552                 unsigned short oldattr = vc->vc_attr;
 553                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 554                                      vc->vc_cols - vc->vc_x - nr);
 555                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 556                 while (nr--)
 557                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 558                                      vc->vc_cols - 1 - nr);
 559                 vc->vc_attr = oldattr;
 560         }
 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 static 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         } else {
 678                 hide_cursor(vc);
 679                 redraw = 1;
 680         }
 681
 682         if (redraw) {
 683                 int update;
 684                 int old_was_color = vc->vc_can_do_color;
 685
 686                 set_origin(vc);
 687                 update = vc->vc_sw->con_switch(vc);
 688                 set_palette(vc);
 689                 /*
 690                  * If console changed from mono<->color, the best we can do
 691                  * is to clear the buffer attributes. As it currently stands,
 692                  * rebuilding new attributes from the old buffer is not doable
 693                  * without overly complex code.
 694                  */
 695                 if (old_was_color != vc->vc_can_do_color) {
 696                         update_attr(vc);
 697                         clear_buffer_attributes(vc);
 698                 }
 699                 if (update && vc->vc_mode != KD_GRAPHICS)
 700                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 701         }
 702         set_cursor(vc);
 703         if (is_switch) {
 704                 set_leds();
 705                 compute_shiftstate();
 706                 notify_update(vc);
 707         }
 708 }
 709
 710 /*
 711  *      Allocation, freeing and resizing of VTs.
 712  */
 713
 714 int vc_cons_allocated(unsigned int i)
 715 {
 716         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 717 }
 718
 719 static void visual_init(struct vc_data *vc, int num, int init)
 720 {
 721         /* ++Geert: vc->vc_sw->con_init determines console size */
 722         if (vc->vc_sw)
 723                 module_put(vc->vc_sw->owner);
 724         vc->vc_sw = conswitchp;
 725 #ifndef VT_SINGLE_DRIVER
 726         if (con_driver_map[num])
 727                 vc->vc_sw = con_driver_map[num];
 728 #endif
 729         __module_get(vc->vc_sw->owner);
 730         vc->vc_num = num;
 731         vc->vc_display_fg = &master_display_fg;
 732         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 733         vc->vc_uni_pagedir = 0;
 734         vc->vc_hi_font_mask = 0;
 735         vc->vc_complement_mask = 0;
 736         vc->vc_can_do_color = 0;
 737         vc->vc_sw->con_init(vc, init);
 738         if (!vc->vc_complement_mask)
 739                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 740         vc->vc_s_complement_mask = vc->vc_complement_mask;
 741         vc->vc_size_row = vc->vc_cols << 1;
 742         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 743 }
 744
 745 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 746 {
 747         WARN_CONSOLE_UNLOCKED();
 748
 749         if (currcons >= MAX_NR_CONSOLES)
 750                 return -ENXIO;
 751         if (!vc_cons[currcons].d) {
 752             struct vc_data *vc;
 753             struct vt_notifier_param param;
 754
 755             /* prevent users from taking too much memory */
 756             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 757               return -EPERM;
 758
 759             /* due to the granularity of kmalloc, we waste some memory here */
 760             /* the alloc is done in two steps, to optimize the common situation
 761                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 762             /* although the numbers above are not valid since long ago, the
 763                point is still up-to-date and the comment still has its value
 764                even if only as a historical artifact.  --mj, July 1998 */
 765             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 766             if (!vc)
 767                 return -ENOMEM;
 768             vc_cons[currcons].d = vc;
 769             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 770             visual_init(vc, currcons, 1);
 771             if (!*vc->vc_uni_pagedir_loc)
 772                 con_set_default_unimap(vc);
 773             if (!vc->vc_kmalloced)
 774                 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 775             if (!vc->vc_screenbuf) {
 776                 kfree(vc);
 777                 vc_cons[currcons].d = NULL;
 778                 return -ENOMEM;
 779             }
 780             vc->vc_kmalloced = 1;
 781             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 782             vcs_make_sysfs(currcons);
 783             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 784         }
 785         return 0;
 786 }
 787
 788 static inline int resize_screen(struct vc_data *vc, int width, int height,
 789                                 int user)
 790 {
 791         /* Resizes the resolution of the display adapater */
 792         int err = 0;
 793
 794         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 795                 err = vc->vc_sw->con_resize(vc, width, height, user);
 796
 797         return err;
 798 }
 799
 800 /*
 801  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 802  * [this is to be used together with some user program
 803  * like resize that changes the hardware videomode]
 804  */
 805 #define VC_RESIZE_MAXCOL (32767)
 806 #define VC_RESIZE_MAXROW (32767)
 807
 808 /**
 809  *      vc_do_resize    -       resizing method for the tty
 810  *      @tty: tty being resized
 811  *      @real_tty: real tty (different to tty if a pty/tty pair)
 812  *      @vc: virtual console private data
 813  *      @cols: columns
 814  *      @lines: lines
 815  *
 816  *      Resize a virtual console, clipping according to the actual constraints.
 817  *      If the caller passes a tty structure then update the termios winsize
 818  *      information and perform any neccessary signal handling.
 819  *
 820  *      Caller must hold the console semaphore. Takes the termios mutex and
 821  *      ctrl_lock of the tty IFF a tty is passed.
 822  */
 823
 824 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 825                                 unsigned int cols, unsigned int lines)
 826 {
 827         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 828         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 829         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 830         unsigned int end, user;
 831         unsigned short *newscreen;
 832
 833         WARN_CONSOLE_UNLOCKED();
 834
 835         if (!vc)
 836                 return -ENXIO;
 837
 838         user = vc->vc_resize_user;
 839         vc->vc_resize_user = 0;
 840
 841         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 842                 return -EINVAL;
 843
 844         new_cols = (cols ? cols : vc->vc_cols);
 845         new_rows = (lines ? lines : vc->vc_rows);
 846         new_row_size = new_cols << 1;
 847         new_screen_size = new_row_size * new_rows;
 848
 849         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 850                 return 0;
 851
 852         newscreen = kmalloc(new_screen_size, GFP_USER);
 853         if (!newscreen)
 854                 return -ENOMEM;
 855
 856         old_rows = vc->vc_rows;
 857         old_cols = vc->vc_cols;
 858         old_row_size = vc->vc_size_row;
 859         old_screen_size = vc->vc_screenbuf_size;
 860
 861         err = resize_screen(vc, new_cols, new_rows, user);
 862         if (err) {
 863                 kfree(newscreen);
 864                 return err;
 865         }
 866
 867         vc->vc_rows = new_rows;
 868         vc->vc_cols = new_cols;
 869         vc->vc_size_row = new_row_size;
 870         vc->vc_screenbuf_size = new_screen_size;
 871
 872         rlth = min(old_row_size, new_row_size);
 873         rrem = new_row_size - rlth;
 874         old_origin = vc->vc_origin;
 875         new_origin = (long) newscreen;
 876         new_scr_end = new_origin + new_screen_size;
 877
 878         if (vc->vc_y > new_rows) {
 879                 if (old_rows - vc->vc_y < new_rows) {
 880                         /*
 881                          * Cursor near the bottom, copy contents from the
 882                          * bottom of buffer
 883                          */
 884                         old_origin += (old_rows - new_rows) * old_row_size;
 885                         end = vc->vc_scr_end;
 886                 } else {
 887                         /*
 888                          * Cursor is in no man's land, copy 1/2 screenful
 889                          * from the top and bottom of cursor position
 890                          */
 891                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 892                         end = old_origin + (old_row_size * new_rows);
 893                 }
 894         } else
 895                 /*
 896                  * Cursor near the top, copy contents from the top of buffer
 897                  */
 898                 end = (old_rows > new_rows) ? old_origin +
 899                         (old_row_size * new_rows) :
 900                         vc->vc_scr_end;
 901
 902         update_attr(vc);
 903
 904         while (old_origin < end) {
 905                 scr_memcpyw((unsigned short *) new_origin,
 906                             (unsigned short *) old_origin, rlth);
 907                 if (rrem)
 908                         scr_memsetw((void *)(new_origin + rlth),
 909                                     vc->vc_video_erase_char, rrem);
 910                 old_origin += old_row_size;
 911                 new_origin += new_row_size;
 912         }
 913         if (new_scr_end > new_origin)
 914                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 915                             new_scr_end - new_origin);
 916         if (vc->vc_kmalloced)
 917                 kfree(vc->vc_screenbuf);
 918         vc->vc_screenbuf = newscreen;
 919         vc->vc_kmalloced = 1;
 920         vc->vc_screenbuf_size = new_screen_size;
 921         set_origin(vc);
 922
 923         /* do part of a reset_terminal() */
 924         vc->vc_top = 0;
 925         vc->vc_bottom = vc->vc_rows;
 926         gotoxy(vc, vc->vc_x, vc->vc_y);
 927         save_cur(vc);
 928
 929         if (tty) {
 930                 /* Rewrite the requested winsize data with the actual
 931                    resulting sizes */
 932                 struct winsize ws;
 933                 memset(&ws, 0, sizeof(ws));
 934                 ws.ws_row = vc->vc_rows;
 935                 ws.ws_col = vc->vc_cols;
 936                 ws.ws_ypixel = vc->vc_scan_lines;
 937                 tty_do_resize(tty, &ws);
 938         }
 939
 940         if (CON_IS_VISIBLE(vc))
 941                 update_screen(vc);
 942         return err;
 943 }
 944
 945 /**
 946  *      vc_resize               -       resize a VT
 947  *      @vc: virtual console
 948  *      @cols: columns
 949  *      @rows: rows
 950  *
 951  *      Resize a virtual console as seen from the console end of things. We
 952  *      use the common vc_do_resize methods to update the structures. The
 953  *      caller must hold the console sem to protect console internals and
 954  *      vc->vc_tty
 955  */
 956
 957 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 958 {
 959         return vc_do_resize(vc->vc_tty, vc, cols, rows);
 960 }
 961
 962 /**
 963  *      vt_resize               -       resize a VT
 964  *      @tty: tty to resize
 965  *      @ws: winsize attributes
 966  *
 967  *      Resize a virtual terminal. This is called by the tty layer as we
 968  *      register our own handler for resizing. The mutual helper does all
 969  *      the actual work.
 970  *
 971  *      Takes the console sem and the called methods then take the tty
 972  *      termios_mutex and the tty ctrl_lock in that order.
 973  */
 974 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 975 {
 976         struct vc_data *vc = tty->driver_data;
 977         int ret;
 978
 979         acquire_console_sem();
 980         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 981         release_console_sem();
 982         return ret;
 983 }
 984
 985 void vc_deallocate(unsigned int currcons)
 986 {
 987         WARN_CONSOLE_UNLOCKED();
 988
 989         if (vc_cons_allocated(currcons)) {
 990                 struct vc_data *vc = vc_cons[currcons].d;
 991                 struct vt_notifier_param param = { .vc = vc };
 992
 993                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 994                 vcs_remove_sysfs(currcons);
 995                 vc->vc_sw->con_deinit(vc);
 996                 put_pid(vc->vt_pid);
 997                 module_put(vc->vc_sw->owner);
 998                 if (vc->vc_kmalloced)
 999                         kfree(vc->vc_screenbuf);
1000                 if (currcons >= MIN_NR_CONSOLES)
1001                         kfree(vc);
1002                 vc_cons[currcons].d = NULL;
1003         }
1004 }
1005
1006 /*
1007  *      VT102 emulator
1008  */
1009
1010 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1011 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1012 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1013
1014 #define decarm          VC_REPEAT
1015 #define decckm          VC_CKMODE
1016 #define kbdapplic       VC_APPLIC
1017 #define lnm             VC_CRLF
1018
1019 /*
1020  * this is what the terminal answers to a ESC-Z or csi0c query.
1021  */
1022 #define VT100ID "\033[?1;2c"
1023 #define VT102ID "\033[?6c"
1024
1025 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1026                                        8,12,10,14, 9,13,11,15 };
1027
1028 /* the default colour table, for VGA+ colour systems */
1029 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1030     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1031 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1032     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1033 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1034     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1035
1036 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1037 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1038 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1039
1040 /*
1041  * gotoxy() must verify all boundaries, because the arguments
1042  * might also be negative. If the given position is out of
1043  * bounds, the cursor is placed at the nearest margin.
1044  */
1045 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1046 {
1047         int min_y, max_y;
1048
1049         if (new_x < 0)
1050                 vc->vc_x = 0;
1051         else {
1052                 if (new_x >= vc->vc_cols)
1053                         vc->vc_x = vc->vc_cols - 1;
1054                 else
1055                         vc->vc_x = new_x;
1056         }
1057
1058         if (vc->vc_decom) {
1059                 min_y = vc->vc_top;
1060                 max_y = vc->vc_bottom;
1061         } else {
1062                 min_y = 0;
1063                 max_y = vc->vc_rows;
1064         }
1065         if (new_y < min_y)
1066                 vc->vc_y = min_y;
1067         else if (new_y >= max_y)
1068                 vc->vc_y = max_y - 1;
1069         else
1070                 vc->vc_y = new_y;
1071         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1072         vc->vc_need_wrap = 0;
1073 }
1074
1075 /* for absolute user moves, when decom is set */
1076 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1077 {
1078         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1079 }
1080
1081 void scrollback(struct vc_data *vc, int lines)
1082 {
1083         if (!lines)
1084                 lines = vc->vc_rows / 2;
1085         scrolldelta(-lines);
1086 }
1087
1088 void scrollfront(struct vc_data *vc, int lines)
1089 {
1090         if (!lines)
1091                 lines = vc->vc_rows / 2;
1092         scrolldelta(lines);
1093 }
1094
1095 static void lf(struct vc_data *vc)
1096 {
1097         /* don't scroll if above bottom of scrolling region, or
1098          * if below scrolling region
1099          */
1100         if (vc->vc_y + 1 == vc->vc_bottom)
1101                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1102         else if (vc->vc_y < vc->vc_rows - 1) {
1103                 vc->vc_y++;
1104                 vc->vc_pos += vc->vc_size_row;
1105         }
1106         vc->vc_need_wrap = 0;
1107         notify_write(vc, '\n');
1108 }
1109
1110 static void ri(struct vc_data *vc)
1111 {
1112         /* don't scroll if below top of scrolling region, or
1113          * if above scrolling region
1114          */
1115         if (vc->vc_y == vc->vc_top)
1116                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1117         else if (vc->vc_y > 0) {
1118                 vc->vc_y--;
1119                 vc->vc_pos -= vc->vc_size_row;
1120         }
1121         vc->vc_need_wrap = 0;
1122 }
1123
1124 static inline void cr(struct vc_data *vc)
1125 {
1126         vc->vc_pos -= vc->vc_x << 1;
1127         vc->vc_need_wrap = vc->vc_x = 0;
1128         notify_write(vc, '\r');
1129 }
1130
1131 static inline void bs(struct vc_data *vc)
1132 {
1133         if (vc->vc_x) {
1134                 vc->vc_pos -= 2;
1135                 vc->vc_x--;
1136                 vc->vc_need_wrap = 0;
1137                 notify_write(vc, '\b');
1138         }
1139 }
1140
1141 static inline void del(struct vc_data *vc)
1142 {
1143         /* ignored */
1144 }
1145
1146 static void csi_J(struct vc_data *vc, int vpar)
1147 {
1148         unsigned int count;
1149         unsigned short * start;
1150
1151         switch (vpar) {
1152                 case 0: /* erase from cursor to end of display */
1153                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1154                         start = (unsigned short *)vc->vc_pos;
1155                         if (DO_UPDATE(vc)) {
1156                                 /* do in two stages */
1157                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1158                                               vc->vc_cols - vc->vc_x);
1159                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1160                                               vc->vc_rows - vc->vc_y - 1,
1161                                               vc->vc_cols);
1162                         }
1163                         break;
1164                 case 1: /* erase from start to cursor */
1165                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1166                         start = (unsigned short *)vc->vc_origin;
1167                         if (DO_UPDATE(vc)) {
1168                                 /* do in two stages */
1169                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1170                                               vc->vc_cols);
1171                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1172                                               vc->vc_x + 1);
1173                         }
1174                         break;
1175                 case 2: /* erase whole display */
1176                         count = vc->vc_cols * vc->vc_rows;
1177                         start = (unsigned short *)vc->vc_origin;
1178                         if (DO_UPDATE(vc))
1179                                 vc->vc_sw->con_clear(vc, 0, 0,
1180                                               vc->vc_rows,
1181                                               vc->vc_cols);
1182                         break;
1183                 default:
1184                         return;
1185         }
1186         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1187         vc->vc_need_wrap = 0;
1188 }
1189
1190 static void csi_K(struct vc_data *vc, int vpar)
1191 {
1192         unsigned int count;
1193         unsigned short * start;
1194
1195         switch (vpar) {
1196                 case 0: /* erase from cursor to end of line */
1197                         count = vc->vc_cols - vc->vc_x;
1198                         start = (unsigned short *)vc->vc_pos;
1199                         if (DO_UPDATE(vc))
1200                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1201                                                      vc->vc_cols - vc->vc_x);
1202                         break;
1203                 case 1: /* erase from start of line to cursor */
1204                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1205                         count = vc->vc_x + 1;
1206                         if (DO_UPDATE(vc))
1207                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1208                                                      vc->vc_x + 1);
1209                         break;
1210                 case 2: /* erase whole line */
1211                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1212                         count = vc->vc_cols;
1213                         if (DO_UPDATE(vc))
1214                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1215                                               vc->vc_cols);
1216                         break;
1217                 default:
1218                         return;
1219         }
1220         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1221         vc->vc_need_wrap = 0;
1222 }
1223
1224 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1225 {                                         /* not vt100? */
1226         int count;
1227
1228         if (!vpar)
1229                 vpar++;
1230         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1231
1232         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1233         if (DO_UPDATE(vc))
1234                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1235         vc->vc_need_wrap = 0;
1236 }
1237
1238 static void default_attr(struct vc_data *vc)
1239 {
1240         vc->vc_intensity = 1;
1241         vc->vc_italic = 0;
1242         vc->vc_underline = 0;
1243         vc->vc_reverse = 0;
1244         vc->vc_blink = 0;
1245         vc->vc_color = vc->vc_def_color;
1246 }
1247
1248 /* console_sem is held */
1249 static void csi_m(struct vc_data *vc)
1250 {
1251         int i;
1252
1253         for (i = 0; i <= vc->vc_npar; i++)
1254                 switch (vc->vc_par[i]) {
1255                         case 0: /* all attributes off */
1256                                 default_attr(vc);
1257                                 break;
1258                         case 1:
1259                                 vc->vc_intensity = 2;
1260                                 break;
1261                         case 2:
1262                                 vc->vc_intensity = 0;
1263                                 break;
1264                         case 3:
1265                                 vc->vc_italic = 1;
1266                                 break;
1267                         case 4:
1268                                 vc->vc_underline = 1;
1269                                 break;
1270                         case 5:
1271                                 vc->vc_blink = 1;
1272                                 break;
1273                         case 7:
1274                                 vc->vc_reverse = 1;
1275                                 break;
1276                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1277                                   * Select primary font, don't display
1278                                   * control chars if defined, don't set
1279                                   * bit 8 on output.
1280                                   */
1281                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1282                                                 ? vc->vc_G0_charset
1283                                                 : vc->vc_G1_charset, vc);
1284                                 vc->vc_disp_ctrl = 0;
1285                                 vc->vc_toggle_meta = 0;
1286                                 break;
1287                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1288                                   * Select first alternate font, lets
1289                                   * chars < 32 be displayed as ROM chars.
1290                                   */
1291                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1292                                 vc->vc_disp_ctrl = 1;
1293                                 vc->vc_toggle_meta = 0;
1294                                 break;
1295                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1296                                   * Select second alternate font, toggle
1297                                   * high bit before displaying as ROM char.
1298                                   */
1299                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1300                                 vc->vc_disp_ctrl = 1;
1301                                 vc->vc_toggle_meta = 1;
1302                                 break;
1303                         case 21:
1304                         case 22:
1305                                 vc->vc_intensity = 1;
1306                                 break;
1307                         case 23:
1308                                 vc->vc_italic = 0;
1309                                 break;
1310                         case 24:
1311                                 vc->vc_underline = 0;
1312                                 break;
1313                         case 25:
1314                                 vc->vc_blink = 0;
1315                                 break;
1316                         case 27:
1317                                 vc->vc_reverse = 0;
1318                                 break;
1319                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1320                                   * Enables underscore, white foreground
1321                                   * with white underscore (Linux - use
1322                                   * default foreground).
1323                                   */
1324                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1325                                 vc->vc_underline = 1;
1326                                 break;
1327                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1328                                   * Disable underline option.
1329                                   * Reset colour to default? It did this
1330                                   * before...
1331                                   */
1332                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1333                                 vc->vc_underline = 0;
1334                                 break;
1335                         case 49:
1336                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1337                                 break;
1338                         default:
1339                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1340                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1341                                                 | (vc->vc_color & 0xf0);
1342                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1343                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1344                                                 | (vc->vc_color & 0x0f);
1345                                 break;
1346                 }
1347         update_attr(vc);
1348 }
1349
1350 static void respond_string(const char *p, struct tty_struct *tty)
1351 {
1352         while (*p) {
1353                 tty_insert_flip_char(tty, *p, 0);
1354                 p++;
1355         }
1356         con_schedule_flip(tty);
1357 }
1358
1359 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1360 {
1361         char buf[40];
1362
1363         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1364         respond_string(buf, tty);
1365 }
1366
1367 static inline void status_report(struct tty_struct *tty)
1368 {
1369         respond_string("\033[0n", tty); /* Terminal ok */
1370 }
1371
1372 static inline void respond_ID(struct tty_struct * tty)
1373 {
1374         respond_string(VT102ID, tty);
1375 }
1376
1377 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1378 {
1379         char buf[8];
1380
1381         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1382                 (char)('!' + mry));
1383         respond_string(buf, tty);
1384 }
1385
1386 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1387 int mouse_reporting(void)
1388 {
1389         return vc_cons[fg_console].d->vc_report_mouse;
1390 }
1391
1392 /* console_sem is held */
1393 static void set_mode(struct vc_data *vc, int on_off)
1394 {
1395         int i;
1396
1397         for (i = 0; i <= vc->vc_npar; i++)
1398                 if (vc->vc_ques) {
1399                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1400                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1401                                 if (on_off)
1402                                         set_kbd(vc, decckm);
1403                                 else
1404                                         clr_kbd(vc, decckm);
1405                                 break;
1406                         case 3: /* 80/132 mode switch unimplemented */
1407                                 vc->vc_deccolm = on_off;
1408 #if 0
1409                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1410                                 /* this alone does not suffice; some user mode
1411                                    utility has to change the hardware regs */
1412 #endif
1413                                 break;
1414                         case 5:                 /* Inverted screen on/off */
1415                                 if (vc->vc_decscnm != on_off) {
1416                                         vc->vc_decscnm = on_off;
1417                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1418                                         update_attr(vc);
1419                                 }
1420                                 break;
1421                         case 6:                 /* Origin relative/absolute */
1422                                 vc->vc_decom = on_off;
1423                                 gotoxay(vc, 0, 0);
1424                                 break;
1425                         case 7:                 /* Autowrap on/off */
1426                                 vc->vc_decawm = on_off;
1427                                 break;
1428                         case 8:                 /* Autorepeat on/off */
1429                                 if (on_off)
1430                                         set_kbd(vc, decarm);
1431                                 else
1432                                         clr_kbd(vc, decarm);
1433                                 break;
1434                         case 9:
1435                                 vc->vc_report_mouse = on_off ? 1 : 0;
1436                                 break;
1437                         case 25:                /* Cursor on/off */
1438                                 vc->vc_deccm = on_off;
1439                                 break;
1440                         case 1000:
1441                                 vc->vc_report_mouse = on_off ? 2 : 0;
1442                                 break;
1443                         }
1444                 } else {
1445                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1446                         case 3:                 /* Monitor (display ctrls) */
1447                                 vc->vc_disp_ctrl = on_off;
1448                                 break;
1449                         case 4:                 /* Insert Mode on/off */
1450                                 vc->vc_decim = on_off;
1451                                 break;
1452                         case 20:                /* Lf, Enter == CrLf/Lf */
1453                                 if (on_off)
1454                                         set_kbd(vc, lnm);
1455                                 else
1456                                         clr_kbd(vc, lnm);
1457                                 break;
1458                         }
1459                 }
1460 }
1461
1462 /* console_sem is held */
1463 static void setterm_command(struct vc_data *vc)
1464 {
1465         switch(vc->vc_par[0]) {
1466                 case 1: /* set color for underline mode */
1467                         if (vc->vc_can_do_color &&
1468                                         vc->vc_par[1] < 16) {
1469                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1470                                 if (vc->vc_underline)
1471                                         update_attr(vc);
1472                         }
1473                         break;
1474                 case 2: /* set color for half intensity mode */
1475                         if (vc->vc_can_do_color &&
1476                                         vc->vc_par[1] < 16) {
1477                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1478                                 if (vc->vc_intensity == 0)
1479                                         update_attr(vc);
1480                         }
1481                         break;
1482                 case 8: /* store colors as defaults */
1483                         vc->vc_def_color = vc->vc_attr;
1484                         if (vc->vc_hi_font_mask == 0x100)
1485                                 vc->vc_def_color >>= 1;
1486                         default_attr(vc);
1487                         update_attr(vc);
1488                         break;
1489                 case 9: /* set blanking interval */
1490                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1491                         poke_blanked_console();
1492                         break;
1493                 case 10: /* set bell frequency in Hz */
1494                         if (vc->vc_npar >= 1)
1495                                 vc->vc_bell_pitch = vc->vc_par[1];
1496                         else
1497                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1498                         break;
1499                 case 11: /* set bell duration in msec */
1500                         if (vc->vc_npar >= 1)
1501                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1502                                         vc->vc_par[1] * HZ / 1000 : 0;
1503                         else
1504                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1505                         break;
1506                 case 12: /* bring specified console to the front */
1507                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1508                                 set_console(vc->vc_par[1] - 1);
1509                         break;
1510                 case 13: /* unblank the screen */
1511                         poke_blanked_console();
1512                         break;
1513                 case 14: /* set vesa powerdown interval */
1514                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1515                         break;
1516                 case 15: /* activate the previous console */
1517                         set_console(last_console);
1518                         break;
1519         }
1520 }
1521
1522 /* console_sem is held */
1523 static void csi_at(struct vc_data *vc, unsigned int nr)
1524 {
1525         if (nr > vc->vc_cols - vc->vc_x)
1526                 nr = vc->vc_cols - vc->vc_x;
1527         else if (!nr)
1528                 nr = 1;
1529         insert_char(vc, nr);
1530 }
1531
1532 /* console_sem is held */
1533 static void csi_L(struct vc_data *vc, unsigned int nr)
1534 {
1535         if (nr > vc->vc_rows - vc->vc_y)
1536                 nr = vc->vc_rows - vc->vc_y;
1537         else if (!nr)
1538                 nr = 1;
1539         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1540         vc->vc_need_wrap = 0;
1541 }
1542
1543 /* console_sem is held */
1544 static void csi_P(struct vc_data *vc, unsigned int nr)
1545 {
1546         if (nr > vc->vc_cols - vc->vc_x)
1547                 nr = vc->vc_cols - vc->vc_x;
1548         else if (!nr)
1549                 nr = 1;
1550         delete_char(vc, nr);
1551 }
1552
1553 /* console_sem is held */
1554 static void csi_M(struct vc_data *vc, unsigned int nr)
1555 {
1556         if (nr > vc->vc_rows - vc->vc_y)
1557                 nr = vc->vc_rows - vc->vc_y;
1558         else if (!nr)
1559                 nr=1;
1560         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1561         vc->vc_need_wrap = 0;
1562 }
1563
1564 /* console_sem is held (except via vc_init->reset_terminal */
1565 static void save_cur(struct vc_data *vc)
1566 {
1567         vc->vc_saved_x          = vc->vc_x;
1568         vc->vc_saved_y          = vc->vc_y;
1569         vc->vc_s_intensity      = vc->vc_intensity;
1570         vc->vc_s_italic         = vc->vc_italic;
1571         vc->vc_s_underline      = vc->vc_underline;
1572         vc->vc_s_blink          = vc->vc_blink;
1573         vc->vc_s_reverse        = vc->vc_reverse;
1574         vc->vc_s_charset        = vc->vc_charset;
1575         vc->vc_s_color          = vc->vc_color;
1576         vc->vc_saved_G0         = vc->vc_G0_charset;
1577         vc->vc_saved_G1         = vc->vc_G1_charset;
1578 }
1579
1580 /* console_sem is held */
1581 static void restore_cur(struct vc_data *vc)
1582 {
1583         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1584         vc->vc_intensity        = vc->vc_s_intensity;
1585         vc->vc_italic           = vc->vc_s_italic;
1586         vc->vc_underline        = vc->vc_s_underline;
1587         vc->vc_blink            = vc->vc_s_blink;
1588         vc->vc_reverse          = vc->vc_s_reverse;
1589         vc->vc_charset          = vc->vc_s_charset;
1590         vc->vc_color            = vc->vc_s_color;
1591         vc->vc_G0_charset       = vc->vc_saved_G0;
1592         vc->vc_G1_charset       = vc->vc_saved_G1;
1593         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1594         update_attr(vc);
1595         vc->vc_need_wrap = 0;
1596 }
1597
1598 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1599         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1600         ESpalette };
1601
1602 /* console_sem is held (except via vc_init()) */
1603 static void reset_terminal(struct vc_data *vc, int do_clear)
1604 {
1605         vc->vc_top              = 0;
1606         vc->vc_bottom           = vc->vc_rows;
1607         vc->vc_state            = ESnormal;
1608         vc->vc_ques             = 0;
1609         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1610         vc->vc_G0_charset       = LAT1_MAP;
1611         vc->vc_G1_charset       = GRAF_MAP;
1612         vc->vc_charset          = 0;
1613         vc->vc_need_wrap        = 0;
1614         vc->vc_report_mouse     = 0;
1615         vc->vc_utf              = default_utf8;
1616         vc->vc_utf_count        = 0;
1617
1618         vc->vc_disp_ctrl        = 0;
1619         vc->vc_toggle_meta      = 0;
1620
1621         vc->vc_decscnm          = 0;
1622         vc->vc_decom            = 0;
1623         vc->vc_decawm           = 1;
1624         vc->vc_deccm            = 1;
1625         vc->vc_decim            = 0;
1626
1627         set_kbd(vc, decarm);
1628         clr_kbd(vc, decckm);
1629         clr_kbd(vc, kbdapplic);
1630         clr_kbd(vc, lnm);
1631         kbd_table[vc->vc_num].lockstate = 0;
1632         kbd_table[vc->vc_num].slockstate = 0;
1633         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1634         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1635         /* do not do set_leds here because this causes an endless tasklet loop
1636            when the keyboard hasn't been initialized yet */
1637
1638         vc->vc_cursor_type = CUR_DEFAULT;
1639         vc->vc_complement_mask = vc->vc_s_complement_mask;
1640
1641         default_attr(vc);
1642         update_attr(vc);
1643
1644         vc->vc_tab_stop[0]      = 0x01010100;
1645         vc->vc_tab_stop[1]      =
1646         vc->vc_tab_stop[2]      =
1647         vc->vc_tab_stop[3]      =
1648         vc->vc_tab_stop[4]      =
1649         vc->vc_tab_stop[5]      =
1650         vc->vc_tab_stop[6]      =
1651         vc->vc_tab_stop[7]      = 0x01010101;
1652
1653         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1654         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1655
1656         gotoxy(vc, 0, 0);
1657         save_cur(vc);
1658         if (do_clear)
1659             csi_J(vc, 2);
1660 }
1661
1662 /* console_sem is held */
1663 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1664 {
1665         /*
1666          *  Control characters can be used in the _middle_
1667          *  of an escape sequence.
1668          */
1669         switch (c) {
1670         case 0:
1671                 return;
1672         case 7:
1673                 if (vc->vc_bell_duration)
1674                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1675                 return;
1676         case 8:
1677                 bs(vc);
1678                 return;
1679         case 9:
1680                 vc->vc_pos -= (vc->vc_x << 1);
1681                 while (vc->vc_x < vc->vc_cols - 1) {
1682                         vc->vc_x++;
1683                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1684                                 break;
1685                 }
1686                 vc->vc_pos += (vc->vc_x << 1);
1687                 notify_write(vc, '\t');
1688                 return;
1689         case 10: case 11: case 12:
1690                 lf(vc);
1691                 if (!is_kbd(vc, lnm))
1692                         return;
1693         case 13:
1694                 cr(vc);
1695                 return;
1696         case 14:
1697                 vc->vc_charset = 1;
1698                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1699                 vc->vc_disp_ctrl = 1;
1700                 return;
1701         case 15:
1702                 vc->vc_charset = 0;
1703                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1704                 vc->vc_disp_ctrl = 0;
1705                 return;
1706         case 24: case 26:
1707                 vc->vc_state = ESnormal;
1708                 return;
1709         case 27:
1710                 vc->vc_state = ESesc;
1711                 return;
1712         case 127:
1713                 del(vc);
1714                 return;
1715         case 128+27:
1716                 vc->vc_state = ESsquare;
1717                 return;
1718         }
1719         switch(vc->vc_state) {
1720         case ESesc:
1721                 vc->vc_state = ESnormal;
1722                 switch (c) {
1723                 case '[':
1724                         vc->vc_state = ESsquare;
1725                         return;
1726                 case ']':
1727                         vc->vc_state = ESnonstd;
1728                         return;
1729                 case '%':
1730                         vc->vc_state = ESpercent;
1731                         return;
1732                 case 'E':
1733                         cr(vc);
1734                         lf(vc);
1735                         return;
1736                 case 'M':
1737                         ri(vc);
1738                         return;
1739                 case 'D':
1740                         lf(vc);
1741                         return;
1742                 case 'H':
1743                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1744                         return;
1745                 case 'Z':
1746                         respond_ID(tty);
1747                         return;
1748                 case '7':
1749                         save_cur(vc);
1750                         return;
1751                 case '8':
1752                         restore_cur(vc);
1753                         return;
1754                 case '(':
1755                         vc->vc_state = ESsetG0;
1756                         return;
1757                 case ')':
1758                         vc->vc_state = ESsetG1;
1759                         return;
1760                 case '#':
1761                         vc->vc_state = EShash;
1762                         return;
1763                 case 'c':
1764                         reset_terminal(vc, 1);
1765                         return;
1766                 case '>':  /* Numeric keypad */
1767                         clr_kbd(vc, kbdapplic);
1768                         return;
1769                 case '=':  /* Appl. keypad */
1770                         set_kbd(vc, kbdapplic);
1771                         return;
1772                 }
1773                 return;
1774         case ESnonstd:
1775                 if (c=='P') {   /* palette escape sequence */
1776                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1777                                 vc->vc_par[vc->vc_npar] = 0;
1778                         vc->vc_npar = 0;
1779                         vc->vc_state = ESpalette;
1780                         return;
1781                 } else if (c=='R') {   /* reset palette */
1782                         reset_palette(vc);
1783                         vc->vc_state = ESnormal;
1784                 } else
1785                         vc->vc_state = ESnormal;
1786                 return;
1787         case ESpalette:
1788                 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1789                         vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1790                         if (vc->vc_npar == 7) {
1791                                 int i = vc->vc_par[0] * 3, j = 1;
1792                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1793                                 vc->vc_palette[i++] += vc->vc_par[j++];
1794                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1795                                 vc->vc_palette[i++] += vc->vc_par[j++];
1796                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1797                                 vc->vc_palette[i] += vc->vc_par[j];
1798                                 set_palette(vc);
1799                                 vc->vc_state = ESnormal;
1800                         }
1801                 } else
1802                         vc->vc_state = ESnormal;
1803                 return;
1804         case ESsquare:
1805                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1806                         vc->vc_par[vc->vc_npar] = 0;
1807                 vc->vc_npar = 0;
1808                 vc->vc_state = ESgetpars;
1809                 if (c == '[') { /* Function key */
1810                         vc->vc_state=ESfunckey;
1811                         return;
1812                 }
1813                 vc->vc_ques = (c == '?');
1814                 if (vc->vc_ques)
1815                         return;
1816         case ESgetpars:
1817                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1818                         vc->vc_npar++;
1819                         return;
1820                 } else if (c>='0' && c<='9') {
1821                         vc->vc_par[vc->vc_npar] *= 10;
1822                         vc->vc_par[vc->vc_npar] += c - '0';
1823                         return;
1824                 } else
1825                         vc->vc_state = ESgotpars;
1826         case ESgotpars:
1827                 vc->vc_state = ESnormal;
1828                 switch(c) {
1829                 case 'h':
1830                         set_mode(vc, 1);
1831                         return;
1832                 case 'l':
1833                         set_mode(vc, 0);
1834                         return;
1835                 case 'c':
1836                         if (vc->vc_ques) {
1837                                 if (vc->vc_par[0])
1838                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1839                                 else
1840                                         vc->vc_cursor_type = CUR_DEFAULT;
1841                                 return;
1842                         }
1843                         break;
1844                 case 'm':
1845                         if (vc->vc_ques) {
1846                                 clear_selection();
1847                                 if (vc->vc_par[0])
1848                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1849                                 else
1850                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1851                                 return;
1852                         }
1853                         break;
1854                 case 'n':
1855                         if (!vc->vc_ques) {
1856                                 if (vc->vc_par[0] == 5)
1857                                         status_report(tty);
1858                                 else if (vc->vc_par[0] == 6)
1859                                         cursor_report(vc, tty);
1860                         }
1861                         return;
1862                 }
1863                 if (vc->vc_ques) {
1864                         vc->vc_ques = 0;
1865                         return;
1866                 }
1867                 switch(c) {
1868                 case 'G': case '`':
1869                         if (vc->vc_par[0])
1870                                 vc->vc_par[0]--;
1871                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1872                         return;
1873                 case 'A':
1874                         if (!vc->vc_par[0])
1875                                 vc->vc_par[0]++;
1876                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1877                         return;
1878                 case 'B': case 'e':
1879                         if (!vc->vc_par[0])
1880                                 vc->vc_par[0]++;
1881                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1882                         return;
1883                 case 'C': case 'a':
1884                         if (!vc->vc_par[0])
1885                                 vc->vc_par[0]++;
1886                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1887                         return;
1888                 case 'D':
1889                         if (!vc->vc_par[0])
1890                                 vc->vc_par[0]++;
1891                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1892                         return;
1893                 case 'E':
1894                         if (!vc->vc_par[0])
1895                                 vc->vc_par[0]++;
1896                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1897                         return;
1898                 case 'F':
1899                         if (!vc->vc_par[0])
1900                                 vc->vc_par[0]++;
1901                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1902                         return;
1903                 case 'd':
1904                         if (vc->vc_par[0])
1905                                 vc->vc_par[0]--;
1906                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1907                         return;
1908                 case 'H': case 'f':
1909                         if (vc->vc_par[0])
1910                                 vc->vc_par[0]--;
1911                         if (vc->vc_par[1])
1912                                 vc->vc_par[1]--;
1913                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1914                         return;
1915                 case 'J':
1916                         csi_J(vc, vc->vc_par[0]);
1917                         return;
1918                 case 'K':
1919                         csi_K(vc, vc->vc_par[0]);
1920                         return;
1921                 case 'L':
1922                         csi_L(vc, vc->vc_par[0]);
1923                         return;
1924                 case 'M':
1925                         csi_M(vc, vc->vc_par[0]);
1926                         return;
1927                 case 'P':
1928                         csi_P(vc, vc->vc_par[0]);
1929                         return;
1930                 case 'c':
1931                         if (!vc->vc_par[0])
1932                                 respond_ID(tty);
1933                         return;
1934                 case 'g':
1935                         if (!vc->vc_par[0])
1936                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1937                         else if (vc->vc_par[0] == 3) {
1938                                 vc->vc_tab_stop[0] =
1939                                         vc->vc_tab_stop[1] =
1940                                         vc->vc_tab_stop[2] =
1941                                         vc->vc_tab_stop[3] =
1942                                         vc->vc_tab_stop[4] =
1943                                         vc->vc_tab_stop[5] =
1944                                         vc->vc_tab_stop[6] =
1945                                         vc->vc_tab_stop[7] = 0;
1946                         }
1947                         return;
1948                 case 'm':
1949                         csi_m(vc);
1950                         return;
1951                 case 'q': /* DECLL - but only 3 leds */
1952                         /* map 0,1,2,3 to 0,1,2,4 */
1953                         if (vc->vc_par[0] < 4)
1954                                 setledstate(kbd_table + vc->vc_num,
1955                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1956                         return;
1957                 case 'r':
1958                         if (!vc->vc_par[0])
1959                                 vc->vc_par[0]++;
1960                         if (!vc->vc_par[1])
1961                                 vc->vc_par[1] = vc->vc_rows;
1962                         /* Minimum allowed region is 2 lines */
1963                         if (vc->vc_par[0] < vc->vc_par[1] &&
1964                             vc->vc_par[1] <= vc->vc_rows) {
1965                                 vc->vc_top = vc->vc_par[0] - 1;
1966                                 vc->vc_bottom = vc->vc_par[1];
1967                                 gotoxay(vc, 0, 0);
1968                         }
1969                         return;
1970                 case 's':
1971                         save_cur(vc);
1972                         return;
1973                 case 'u':
1974                         restore_cur(vc);
1975                         return;
1976                 case 'X':
1977                         csi_X(vc, vc->vc_par[0]);
1978                         return;
1979                 case '@':
1980                         csi_at(vc, vc->vc_par[0]);
1981                         return;
1982                 case ']': /* setterm functions */
1983                         setterm_command(vc);
1984                         return;
1985                 }
1986                 return;
1987         case ESpercent:
1988                 vc->vc_state = ESnormal;
1989                 switch (c) {
1990                 case '@':  /* defined in ISO 2022 */
1991                         vc->vc_utf = 0;
1992                         return;
1993                 case 'G':  /* prelim official escape code */
1994                 case '8':  /* retained for compatibility */
1995                         vc->vc_utf = 1;
1996                         return;
1997                 }
1998                 return;
1999         case ESfunckey:
2000                 vc->vc_state = ESnormal;
2001                 return;
2002         case EShash:
2003                 vc->vc_state = ESnormal;
2004                 if (c == '8') {
2005                         /* DEC screen alignment test. kludge :-) */
2006                         vc->vc_video_erase_char =
2007                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2008                         csi_J(vc, 2);
2009                         vc->vc_video_erase_char =
2010                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2011                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2012                 }
2013                 return;
2014         case ESsetG0:
2015                 if (c == '0')
2016                         vc->vc_G0_charset = GRAF_MAP;
2017                 else if (c == 'B')
2018                         vc->vc_G0_charset = LAT1_MAP;
2019                 else if (c == 'U')
2020                         vc->vc_G0_charset = IBMPC_MAP;
2021                 else if (c == 'K')
2022                         vc->vc_G0_charset = USER_MAP;
2023                 if (vc->vc_charset == 0)
2024                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2025                 vc->vc_state = ESnormal;
2026                 return;
2027         case ESsetG1:
2028                 if (c == '0')
2029                         vc->vc_G1_charset = GRAF_MAP;
2030                 else if (c == 'B')
2031                         vc->vc_G1_charset = LAT1_MAP;
2032                 else if (c == 'U')
2033                         vc->vc_G1_charset = IBMPC_MAP;
2034                 else if (c == 'K')
2035                         vc->vc_G1_charset = USER_MAP;
2036                 if (vc->vc_charset == 1)
2037                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2038                 vc->vc_state = ESnormal;
2039                 return;
2040         default:
2041                 vc->vc_state = ESnormal;
2042         }
2043 }
2044
2045 /* This is a temporary buffer used to prepare a tty console write
2046  * so that we can easily avoid touching user space while holding the
2047  * console spinlock.  It is allocated in con_init and is shared by
2048  * this code and the vc_screen read/write tty calls.
2049  *
2050  * We have to allocate this statically in the kernel data section
2051  * since console_init (and thus con_init) are called before any
2052  * kernel memory allocation is available.
2053  */
2054 char con_buf[CON_BUF_SIZE];
2055 DEFINE_MUTEX(con_buf_mtx);
2056
2057 /* is_double_width() is based on the wcwidth() implementation by
2058  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2059  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2060  */
2061 struct interval {
2062         uint32_t first;
2063         uint32_t last;
2064 };
2065
2066 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2067 {
2068         int min = 0;
2069         int mid;
2070
2071         if (ucs < table[0].first || ucs > table[max].last)
2072                 return 0;
2073         while (max >= min) {
2074                 mid = (min + max) / 2;
2075                 if (ucs > table[mid].last)
2076                         min = mid + 1;
2077                 else if (ucs < table[mid].first)
2078                         max = mid - 1;
2079                 else
2080                         return 1;
2081         }
2082         return 0;
2083 }
2084
2085 static int is_double_width(uint32_t ucs)
2086 {
2087         static const struct interval double_width[] = {
2088                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2089                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2090                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2091                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2092         };
2093         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2094 }
2095
2096 /* acquires console_sem */
2097 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2098 {
2099 #ifdef VT_BUF_VRAM_ONLY
2100 #define FLUSH do { } while(0);
2101 #else
2102 #define FLUSH if (draw_x >= 0) { \
2103         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2104         draw_x = -1; \
2105         }
2106 #endif
2107
2108         int c, tc, ok, n = 0, draw_x = -1;
2109         unsigned int currcons;
2110         unsigned long draw_from = 0, draw_to = 0;
2111         struct vc_data *vc;
2112         unsigned char vc_attr;
2113         struct vt_notifier_param param;
2114         uint8_t rescan;
2115         uint8_t inverse;
2116         uint8_t width;
2117         u16 himask, charmask;
2118         const unsigned char *orig_buf = NULL;
2119         int orig_count;
2120
2121         if (in_interrupt())
2122                 return count;
2123
2124         might_sleep();
2125
2126         acquire_console_sem();
2127         vc = tty->driver_data;
2128         if (vc == NULL) {
2129                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2130                 release_console_sem();
2131                 return 0;
2132         }
2133
2134         currcons = vc->vc_num;
2135         if (!vc_cons_allocated(currcons)) {
2136             /* could this happen? */
2137             static int error = 0;
2138             if (!error) {
2139                 error = 1;
2140                 printk("con_write: tty %d not allocated\n", currcons+1);
2141             }
2142             release_console_sem();
2143             return 0;
2144         }
2145         orig_buf = buf;
2146         orig_count = count;
2147
2148         himask = vc->vc_hi_font_mask;
2149         charmask = himask ? 0x1ff : 0xff;
2150
2151         /* undraw cursor first */
2152         if (IS_FG(vc))
2153                 hide_cursor(vc);
2154
2155         param.vc = vc;
2156
2157         while (!tty->stopped && count) {
2158                 int orig = *buf;
2159                 c = orig;
2160                 buf++;
2161                 n++;
2162                 count--;
2163                 rescan = 0;
2164                 inverse = 0;
2165                 width = 1;
2166
2167                 /* Do no translation at all in control states */
2168                 if (vc->vc_state != ESnormal) {
2169                         tc = c;
2170                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2171                     /* Combine UTF-8 into Unicode in vc_utf_char.
2172                      * vc_utf_count is the number of continuation bytes still
2173                      * expected to arrive.
2174                      * vc_npar is the number of continuation bytes arrived so
2175                      * far
2176                      */
2177 rescan_last_byte:
2178                     if ((c & 0xc0) == 0x80) {
2179                         /* Continuation byte received */
2180                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2181                         if (vc->vc_utf_count) {
2182                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2183                             vc->vc_npar++;
2184                             if (--vc->vc_utf_count) {
2185                                 /* Still need some bytes */
2186                                 continue;
2187                             }
2188                             /* Got a whole character */
2189                             c = vc->vc_utf_char;
2190                             /* Reject overlong sequences */
2191                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2192                                         c > utf8_length_changes[vc->vc_npar])
2193                                 c = 0xfffd;
2194                         } else {
2195                             /* Unexpected continuation byte */
2196                             vc->vc_utf_count = 0;
2197                             c = 0xfffd;
2198                         }
2199                     } else {
2200                         /* Single ASCII byte or first byte of a sequence received */
2201                         if (vc->vc_utf_count) {
2202                             /* Continuation byte expected */
2203                             rescan = 1;
2204                             vc->vc_utf_count = 0;
2205                             c = 0xfffd;
2206                         } else if (c > 0x7f) {
2207                             /* First byte of a multibyte sequence received */
2208                             vc->vc_npar = 0;
2209                             if ((c & 0xe0) == 0xc0) {
2210                                 vc->vc_utf_count = 1;
2211                                 vc->vc_utf_char = (c & 0x1f);
2212                             } else if ((c & 0xf0) == 0xe0) {
2213                                 vc->vc_utf_count = 2;
2214                                 vc->vc_utf_char = (c & 0x0f);
2215                             } else if ((c & 0xf8) == 0xf0) {
2216                                 vc->vc_utf_count = 3;
2217                                 vc->vc_utf_char = (c & 0x07);
2218                             } else if ((c & 0xfc) == 0xf8) {
2219                                 vc->vc_utf_count = 4;
2220                                 vc->vc_utf_char = (c & 0x03);
2221                             } else if ((c & 0xfe) == 0xfc) {
2222                                 vc->vc_utf_count = 5;
2223                                 vc->vc_utf_char = (c & 0x01);
2224                             } else {
2225                                 /* 254 and 255 are invalid */
2226                                 c = 0xfffd;
2227                             }
2228                             if (vc->vc_utf_count) {
2229                                 /* Still need some bytes */
2230                                 continue;
2231                             }
2232                         }
2233                         /* Nothing to do if an ASCII byte was received */
2234                     }
2235                     /* End of UTF-8 decoding. */
2236                     /* c is the received character, or U+FFFD for invalid sequences. */
2237                     /* Replace invalid Unicode code points with U+FFFD too */
2238                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2239                         c = 0xfffd;
2240                     tc = c;
2241                 } else {        /* no utf or alternate charset mode */
2242                     tc = vc_translate(vc, c);
2243                 }
2244
2245                 param.c = tc;
2246                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2247                                         &param) == NOTIFY_STOP)
2248                         continue;
2249
2250                 /* If the original code was a control character we
2251                  * only allow a glyph to be displayed if the code is
2252                  * not normally used (such as for cursor movement) or
2253                  * if the disp_ctrl mode has been explicitly enabled.
2254                  * Certain characters (as given by the CTRL_ALWAYS
2255                  * bitmap) are always displayed as control characters,
2256                  * as the console would be pretty useless without
2257                  * them; to display an arbitrary font position use the
2258                  * direct-to-font zone in UTF-8 mode.
2259                  */
2260                 ok = tc && (c >= 32 ||
2261                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2262                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2263                         && (c != 127 || vc->vc_disp_ctrl)
2264                         && (c != 128+27);
2265
2266                 if (vc->vc_state == ESnormal && ok) {
2267                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2268                                 if (is_double_width(c))
2269                                         width = 2;
2270                         }
2271                         /* Now try to find out how to display it */
2272                         tc = conv_uni_to_pc(vc, tc);
2273                         if (tc & ~charmask) {
2274                                 if (tc == -1 || tc == -2) {
2275                                     continue; /* nothing to display */
2276                                 }
2277                                 /* Glyph not found */
2278                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2279                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2280                                        This would make absolutely no sense with Unicode in mind,
2281                                        but do this for ASCII characters since a font may lack
2282                                        Unicode mapping info and we don't want to end up with
2283                                        having question marks only. */
2284                                     tc = c;
2285                                 } else {
2286                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2287                                     tc = conv_uni_to_pc(vc, 0xfffd);
2288                                     if (tc < 0) {
2289                                         inverse = 1;
2290                                         tc = conv_uni_to_pc(vc, '?');
2291                                         if (tc < 0) tc = '?';
2292                                     }
2293                                 }
2294                         }
2295
2296                         if (!inverse) {
2297                                 vc_attr = vc->vc_attr;
2298                         } else {
2299                                 /* invert vc_attr */
2300                                 if (!vc->vc_can_do_color) {
2301                                         vc_attr = (vc->vc_attr) ^ 0x08;
2302                                 } else if (vc->vc_hi_font_mask == 0x100) {
2303                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2304                                 } else {
2305                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2306                                 }
2307                                 FLUSH
2308                         }
2309
2310                         while (1) {
2311                                 if (vc->vc_need_wrap || vc->vc_decim)
2312                                         FLUSH
2313                                 if (vc->vc_need_wrap) {
2314                                         cr(vc);
2315                                         lf(vc);
2316                                 }
2317                                 if (vc->vc_decim)
2318                                         insert_char(vc, 1);
2319                                 scr_writew(himask ?
2320                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2321                                              (vc_attr << 8) + tc,
2322                                            (u16 *) vc->vc_pos);
2323                                 if (DO_UPDATE(vc) && draw_x < 0) {
2324                                         draw_x = vc->vc_x;
2325                                         draw_from = vc->vc_pos;
2326                                 }
2327                                 if (vc->vc_x == vc->vc_cols - 1) {
2328                                         vc->vc_need_wrap = vc->vc_decawm;
2329                                         draw_to = vc->vc_pos + 2;
2330                                 } else {
2331                                         vc->vc_x++;
2332                                         draw_to = (vc->vc_pos += 2);
2333                                 }
2334
2335                                 if (!--width) break;
2336
2337                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2338                                 if (tc < 0) tc = ' ';
2339                         }
2340                         notify_write(vc, c);
2341
2342                         if (inverse) {
2343                                 FLUSH
2344                         }
2345
2346                         if (rescan) {
2347                                 rescan = 0;
2348                                 inverse = 0;
2349                                 width = 1;
2350                                 c = orig;
2351                                 goto rescan_last_byte;
2352                         }
2353                         continue;
2354                 }
2355                 FLUSH
2356                 do_con_trol(tty, vc, orig);
2357         }
2358         FLUSH
2359         console_conditional_schedule();
2360         release_console_sem();
2361         notify_update(vc);
2362         return n;
2363 #undef FLUSH
2364 }
2365
2366 /*
2367  * This is the console switching callback.
2368  *
2369  * Doing console switching in a process context allows
2370  * us to do the switches asynchronously (needed when we want
2371  * to switch due to a keyboard interrupt).  Synchronization
2372  * with other console code and prevention of re-entrancy is
2373  * ensured with console_sem.
2374  */
2375 static void console_callback(struct work_struct *ignored)
2376 {
2377         acquire_console_sem();
2378
2379         if (want_console >= 0) {
2380                 if (want_console != fg_console &&
2381                     vc_cons_allocated(want_console)) {
2382                         hide_cursor(vc_cons[fg_console].d);
2383                         change_console(vc_cons[want_console].d);
2384                         /* we only changed when the console had already
2385                            been allocated - a new console is not created
2386                            in an interrupt routine */
2387                 }
2388                 want_console = -1;
2389         }
2390         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2391                 do_poke_blanked_console = 0;
2392                 poke_blanked_console();
2393         }
2394         if (scrollback_delta) {
2395                 struct vc_data *vc = vc_cons[fg_console].d;
2396                 clear_selection();
2397                 if (vc->vc_mode == KD_TEXT)
2398                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2399                 scrollback_delta = 0;
2400         }
2401         if (blank_timer_expired) {
2402                 do_blank_screen(0);
2403                 blank_timer_expired = 0;
2404         }
2405         notify_update(vc_cons[fg_console].d);
2406
2407         release_console_sem();
2408 }
2409
2410 int set_console(int nr)
2411 {
2412         struct vc_data *vc = vc_cons[fg_console].d;
2413
2414         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2415                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2416
2417                 /*
2418                  * Console switch will fail in console_callback() or
2419                  * change_console() so there is no point scheduling
2420                  * the callback
2421                  *
2422                  * Existing set_console() users don't check the return
2423                  * value so this shouldn't break anything
2424                  */
2425                 return -EINVAL;
2426         }
2427
2428         want_console = nr;
2429         schedule_console_callback();
2430
2431         return 0;
2432 }
2433
2434 struct tty_driver *console_driver;
2435
2436 #ifdef CONFIG_VT_CONSOLE
2437
2438 /*
2439  *      Console on virtual terminal
2440  *
2441  * The console must be locked when we get here.
2442  */
2443
2444 static void vt_console_print(struct console *co, const char *b, unsigned count)
2445 {
2446         struct vc_data *vc = vc_cons[fg_console].d;
2447         unsigned char c;
2448         static DEFINE_SPINLOCK(printing_lock);
2449         const ushort *start;
2450         ushort cnt = 0;
2451         ushort myx;
2452
2453         /* console busy or not yet initialized */
2454         if (!printable)
2455                 return;
2456         if (!spin_trylock(&printing_lock))
2457                 return;
2458
2459         if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2460                 vc = vc_cons[kmsg_redirect - 1].d;
2461
2462         /* read `x' only after setting currcons properly (otherwise
2463            the `x' macro will read the x of the foreground console). */
2464         myx = vc->vc_x;
2465
2466         if (!vc_cons_allocated(fg_console)) {
2467                 /* impossible */
2468                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2469                 goto quit;
2470         }
2471
2472         if (vc->vc_mode != KD_TEXT)
2473                 goto quit;
2474
2475         /* undraw cursor first */
2476         if (IS_FG(vc))
2477                 hide_cursor(vc);
2478
2479         start = (ushort *)vc->vc_pos;
2480
2481         /* Contrived structure to try to emulate original need_wrap behaviour
2482          * Problems caused when we have need_wrap set on '\n' character */
2483         while (count--) {
2484                 c = *b++;
2485                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2486                         if (cnt > 0) {
2487                                 if (CON_IS_VISIBLE(vc))
2488                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2489                                 vc->vc_x += cnt;
2490                                 if (vc->vc_need_wrap)
2491                                         vc->vc_x--;
2492                                 cnt = 0;
2493                         }
2494                         if (c == 8) {           /* backspace */
2495                                 bs(vc);
2496                                 start = (ushort *)vc->vc_pos;
2497                                 myx = vc->vc_x;
2498                                 continue;
2499                         }
2500                         if (c != 13)
2501                                 lf(vc);
2502                         cr(vc);
2503                         start = (ushort *)vc->vc_pos;
2504                         myx = vc->vc_x;
2505                         if (c == 10 || c == 13)
2506                                 continue;
2507                 }
2508                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2509                 notify_write(vc, c);
2510                 cnt++;
2511                 if (myx == vc->vc_cols - 1) {
2512                         vc->vc_need_wrap = 1;
2513                         continue;
2514                 }
2515                 vc->vc_pos += 2;
2516                 myx++;
2517         }
2518         if (cnt > 0) {
2519                 if (CON_IS_VISIBLE(vc))
2520                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2521                 vc->vc_x += cnt;
2522                 if (vc->vc_x == vc->vc_cols) {
2523                         vc->vc_x--;
2524                         vc->vc_need_wrap = 1;
2525                 }
2526         }
2527         set_cursor(vc);
2528         notify_update(vc);
2529
2530 quit:
2531         spin_unlock(&printing_lock);
2532 }
2533
2534 static struct tty_driver *vt_console_device(struct console *c, int *index)
2535 {
2536         *index = c->index ? c->index-1 : fg_console;
2537         return console_driver;
2538 }
2539
2540 static struct console vt_console_driver = {
2541         .name           = "tty",
2542         .write          = vt_console_print,
2543         .device         = vt_console_device,
2544         .unblank        = unblank_screen,
2545         .flags          = CON_PRINTBUFFER,
2546         .index          = -1,
2547 };
2548 #endif
2549
2550 /*
2551  *      Handling of Linux-specific VC ioctls
2552  */
2553
2554 /*
2555  * Generally a bit racy with respect to console_sem().
2556  *
2557  * There are some functions which don't need it.
2558  *
2559  * There are some functions which can sleep for arbitrary periods
2560  * (paste_selection) but we don't need the lock there anyway.
2561  *
2562  * set_selection has locking, and definitely needs it
2563  */
2564
2565 int tioclinux(struct tty_struct *tty, unsigned long arg)
2566 {
2567         char type, data;
2568         char __user *p = (char __user *)arg;
2569         int lines;
2570         int ret;
2571
2572         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2573                 return -EPERM;
2574         if (get_user(type, p))
2575                 return -EFAULT;
2576         ret = 0;
2577
2578         lock_kernel();
2579
2580         switch (type)
2581         {
2582                 case TIOCL_SETSEL:
2583                         acquire_console_sem();
2584                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2585                         release_console_sem();
2586                         break;
2587                 case TIOCL_PASTESEL:
2588                         ret = paste_selection(tty);
2589                         break;
2590                 case TIOCL_UNBLANKSCREEN:
2591                         acquire_console_sem();
2592                         unblank_screen();
2593                         release_console_sem();
2594                         break;
2595                 case TIOCL_SELLOADLUT:
2596                         ret = sel_loadlut(p);
2597                         break;
2598                 case TIOCL_GETSHIFTSTATE:
2599
2600         /*
2601          * Make it possible to react to Shift+Mousebutton.
2602          * Note that 'shift_state' is an undocumented
2603          * kernel-internal variable; programs not closely
2604          * related to the kernel should not use this.
2605          */
2606                         data = shift_state;
2607                         ret = __put_user(data, p);
2608                         break;
2609                 case TIOCL_GETMOUSEREPORTING:
2610                         data = mouse_reporting();
2611                         ret = __put_user(data, p);
2612                         break;
2613                 case TIOCL_SETVESABLANK:
2614                         ret = set_vesa_blanking(p);
2615                         break;
2616                 case TIOCL_GETKMSGREDIRECT:
2617                         data = kmsg_redirect;
2618                         ret = __put_user(data, p);
2619                         break;
2620                 case TIOCL_SETKMSGREDIRECT:
2621                         if (!capable(CAP_SYS_ADMIN)) {
2622                                 ret = -EPERM;
2623                         } else {
2624                                 if (get_user(data, p+1))
2625                                         ret = -EFAULT;
2626                                 else
2627                                         kmsg_redirect = data;
2628                         }
2629                         break;
2630                 case TIOCL_GETFGCONSOLE:
2631                         ret = fg_console;
2632                         break;
2633                 case TIOCL_SCROLLCONSOLE:
2634                         if (get_user(lines, (s32 __user *)(p+4))) {
2635                                 ret = -EFAULT;
2636                         } else {
2637                                 scrollfront(vc_cons[fg_console].d, lines);
2638                                 ret = 0;
2639                         }
2640                         break;
2641                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2642                         acquire_console_sem();
2643                         ignore_poke = 1;
2644                         do_blank_screen(0);
2645                         release_console_sem();
2646                         break;
2647                 case TIOCL_BLANKEDSCREEN:
2648                         ret = console_blanked;
2649                         break;
2650                 default:
2651                         ret = -EINVAL;
2652                         break;
2653         }
2654         unlock_kernel();
2655         return ret;
2656 }
2657
2658 /*
2659  * /dev/ttyN handling
2660  */
2661
2662 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2663 {
2664         int     retval;
2665
2666         retval = do_con_write(tty, buf, count);
2667         con_flush_chars(tty);
2668
2669         return retval;
2670 }
2671
2672 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2673 {
2674         if (in_interrupt())
2675                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2676         return do_con_write(tty, &ch, 1);
2677 }
2678
2679 static int con_write_room(struct tty_struct *tty)
2680 {
2681         if (tty->stopped)
2682                 return 0;
2683         return 32768;           /* No limit, really; we're not buffering */
2684 }
2685
2686 static int con_chars_in_buffer(struct tty_struct *tty)
2687 {
2688         return 0;               /* we're not buffering */
2689 }
2690
2691 /*
2692  * con_throttle and con_unthrottle are only used for
2693  * paste_selection(), which has to stuff in a large number of
2694  * characters...
2695  */
2696 static void con_throttle(struct tty_struct *tty)
2697 {
2698 }
2699
2700 static void con_unthrottle(struct tty_struct *tty)
2701 {
2702         struct vc_data *vc = tty->driver_data;
2703
2704         wake_up_interruptible(&vc->paste_wait);
2705 }
2706
2707 /*
2708  * Turn the Scroll-Lock LED on when the tty is stopped
2709  */
2710 static void con_stop(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         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2719         set_leds();
2720 }
2721
2722 /*
2723  * Turn the Scroll-Lock LED off when the console is started
2724  */
2725 static void con_start(struct tty_struct *tty)
2726 {
2727         int console_num;
2728         if (!tty)
2729                 return;
2730         console_num = tty->index;
2731         if (!vc_cons_allocated(console_num))
2732                 return;
2733         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2734         set_leds();
2735 }
2736
2737 static void con_flush_chars(struct tty_struct *tty)
2738 {
2739         struct vc_data *vc;
2740
2741         if (in_interrupt())     /* from flush_to_ldisc */
2742                 return;
2743
2744         /* if we race with con_close(), vt may be null */
2745         acquire_console_sem();
2746         vc = tty->driver_data;
2747         if (vc)
2748                 set_cursor(vc);
2749         release_console_sem();
2750 }
2751
2752 /*
2753  * Allocate the console screen memory.
2754  */
2755 static int con_open(struct tty_struct *tty, struct file *filp)
2756 {
2757         unsigned int currcons = tty->index;
2758         int ret = 0;
2759
2760         acquire_console_sem();
2761         if (tty->driver_data == NULL) {
2762                 ret = vc_allocate(currcons);
2763                 if (ret == 0) {
2764                         struct vc_data *vc = vc_cons[currcons].d;
2765
2766                         /* Still being freed */
2767                         if (vc->vc_tty) {
2768                                 release_console_sem();
2769                                 return -ERESTARTSYS;
2770                         }
2771                         tty->driver_data = vc;
2772                         vc->vc_tty = tty;
2773
2774                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2775                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2776                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2777                         }
2778                         if (vc->vc_utf)
2779                                 tty->termios->c_iflag |= IUTF8;
2780                         else
2781                                 tty->termios->c_iflag &= ~IUTF8;
2782                         release_console_sem();
2783                         return ret;
2784                 }
2785         }
2786         release_console_sem();
2787         return ret;
2788 }
2789
2790 static void con_close(struct tty_struct *tty, struct file *filp)
2791 {
2792         /* Nothing to do - we defer to shutdown */
2793 }
2794
2795 static void con_shutdown(struct tty_struct *tty)
2796 {
2797         struct vc_data *vc = tty->driver_data;
2798         BUG_ON(vc == NULL);
2799         acquire_console_sem();
2800         vc->vc_tty = NULL;
2801         release_console_sem();
2802         tty_shutdown(tty);
2803 }
2804
2805 static int default_italic_color    = 2; // green (ASCII)
2806 static int default_underline_color = 3; // cyan (ASCII)
2807 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2808 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2809
2810 static void vc_init(struct vc_data *vc, unsigned int rows,
2811                     unsigned int cols, int do_clear)
2812 {
2813         int j, k ;
2814
2815         vc->vc_cols = cols;
2816         vc->vc_rows = rows;
2817         vc->vc_size_row = cols << 1;
2818         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2819
2820         set_origin(vc);
2821         vc->vc_pos = vc->vc_origin;
2822         reset_vc(vc);
2823         for (j=k=0; j<16; j++) {
2824                 vc->vc_palette[k++] = default_red[j] ;
2825                 vc->vc_palette[k++] = default_grn[j] ;
2826                 vc->vc_palette[k++] = default_blu[j] ;
2827         }
2828         vc->vc_def_color       = 0x07;   /* white */
2829         vc->vc_ulcolor         = default_underline_color;
2830         vc->vc_itcolor         = default_italic_color;
2831         vc->vc_halfcolor       = 0x08;   /* grey */
2832         init_waitqueue_head(&vc->paste_wait);
2833         reset_terminal(vc, do_clear);
2834 }
2835
2836 /*
2837  * This routine initializes console interrupts, and does nothing
2838  * else. If you want the screen to clear, call tty_write with
2839  * the appropriate escape-sequence.
2840  */
2841
2842 static int __init con_init(void)
2843 {
2844         const char *display_desc = NULL;
2845         struct vc_data *vc;
2846         unsigned int currcons = 0, i;
2847
2848         acquire_console_sem();
2849
2850         if (conswitchp)
2851                 display_desc = conswitchp->con_startup();
2852         if (!display_desc) {
2853                 fg_console = 0;
2854                 release_console_sem();
2855                 return 0;
2856         }
2857
2858         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2859                 struct con_driver *con_driver = &registered_con_driver[i];
2860
2861                 if (con_driver->con == NULL) {
2862                         con_driver->con = conswitchp;
2863                         con_driver->desc = display_desc;
2864                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2865                         con_driver->first = 0;
2866                         con_driver->last = MAX_NR_CONSOLES - 1;
2867                         break;
2868                 }
2869         }
2870
2871         for (i = 0; i < MAX_NR_CONSOLES; i++)
2872                 con_driver_map[i] = conswitchp;
2873
2874         if (blankinterval) {
2875                 blank_state = blank_normal_wait;
2876                 mod_timer(&console_timer, jiffies + blankinterval);
2877         }
2878
2879         /*
2880          * kmalloc is not running yet - we use the bootmem allocator.
2881          */
2882         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2883                 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2884                 /*
2885                  * Kmemleak does not track the memory allocated via
2886                  * alloc_bootmem() but this block contains pointers to
2887                  * other blocks allocated via kmalloc.
2888                  */
2889                 kmemleak_alloc(vc, sizeof(struct vc_data), 1, GFP_ATOMIC);
2890                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2891                 visual_init(vc, currcons, 1);
2892                 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2893                 vc->vc_kmalloced = 0;
2894                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2895                         currcons || !vc->vc_sw->con_save_screen);
2896         }
2897         currcons = fg_console = 0;
2898         master_display_fg = vc = vc_cons[currcons].d;
2899         set_origin(vc);
2900         save_screen(vc);
2901         gotoxy(vc, vc->vc_x, vc->vc_y);
2902         csi_J(vc, 0);
2903         update_screen(vc);
2904         printk("Console: %s %s %dx%d",
2905                 vc->vc_can_do_color ? "colour" : "mono",
2906                 display_desc, vc->vc_cols, vc->vc_rows);
2907         printable = 1;
2908         printk("\n");
2909
2910         release_console_sem();
2911
2912 #ifdef CONFIG_VT_CONSOLE
2913         register_console(&vt_console_driver);
2914 #endif
2915         return 0;
2916 }
2917 console_initcall(con_init);
2918
2919 static const struct tty_operations con_ops = {
2920         .open = con_open,
2921         .close = con_close,
2922         .write = con_write,
2923         .write_room = con_write_room,
2924         .put_char = con_put_char,
2925         .flush_chars = con_flush_chars,
2926         .chars_in_buffer = con_chars_in_buffer,
2927         .ioctl = vt_ioctl,
2928         .stop = con_stop,
2929         .start = con_start,
2930         .throttle = con_throttle,
2931         .unthrottle = con_unthrottle,
2932         .resize = vt_resize,
2933         .shutdown = con_shutdown
2934 };
2935
2936 static struct cdev vc0_cdev;
2937
2938 int __init vty_init(const struct file_operations *console_fops)
2939 {
2940         cdev_init(&vc0_cdev, console_fops);
2941         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2942             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2943                 panic("Couldn't register /dev/tty0 driver\n");
2944         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2945
2946         vcs_init();
2947
2948         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2949         if (!console_driver)
2950                 panic("Couldn't allocate console driver\n");
2951         console_driver->owner = THIS_MODULE;
2952         console_driver->name = "tty";
2953         console_driver->name_base = 1;
2954         console_driver->major = TTY_MAJOR;
2955         console_driver->minor_start = 1;
2956         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2957         console_driver->init_termios = tty_std_termios;
2958         if (default_utf8)
2959                 console_driver->init_termios.c_iflag |= IUTF8;
2960         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2961         tty_set_operations(console_driver, &con_ops);
2962         if (tty_register_driver(console_driver))
2963                 panic("Couldn't register console driver\n");
2964         kbd_init();
2965         console_map_init();
2966 #ifdef CONFIG_PROM_CONSOLE
2967         prom_con_init();
2968 #endif
2969 #ifdef CONFIG_MDA_CONSOLE
2970         mda_console_init();
2971 #endif
2972         return 0;
2973 }
2974
2975 #ifndef VT_SINGLE_DRIVER
2976 #include <linux/device.h>
2977
2978 static struct class *vtconsole_class;
2979
2980 static int bind_con_driver(const struct consw *csw, int first, int last,
2981                            int deflt)
2982 {
2983         struct module *owner = csw->owner;
2984         const char *desc = NULL;
2985         struct con_driver *con_driver;
2986         int i, j = -1, k = -1, retval = -ENODEV;
2987
2988         if (!try_module_get(owner))
2989                 return -ENODEV;
2990
2991         acquire_console_sem();
2992
2993         /* check if driver is registered */
2994         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2995                 con_driver = &registered_con_driver[i];
2996
2997                 if (con_driver->con == csw) {
2998                         desc = con_driver->desc;
2999                         retval = 0;
3000                         break;
3001                 }
3002         }
3003
3004         if (retval)
3005                 goto err;
3006
3007         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3008                 csw->con_startup();
3009                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3010         }
3011
3012         if (deflt) {
3013                 if (conswitchp)
3014                         module_put(conswitchp->owner);
3015
3016                 __module_get(owner);
3017                 conswitchp = csw;
3018         }
3019
3020         first = max(first, con_driver->first);
3021         last = min(last, con_driver->last);
3022
3023         for (i = first; i <= last; i++) {
3024                 int old_was_color;
3025                 struct vc_data *vc = vc_cons[i].d;
3026
3027                 if (con_driver_map[i])
3028                         module_put(con_driver_map[i]->owner);
3029                 __module_get(owner);
3030                 con_driver_map[i] = csw;
3031
3032                 if (!vc || !vc->vc_sw)
3033                         continue;
3034
3035                 j = i;
3036
3037                 if (CON_IS_VISIBLE(vc)) {
3038                         k = i;
3039                         save_screen(vc);
3040                 }
3041
3042                 old_was_color = vc->vc_can_do_color;
3043                 vc->vc_sw->con_deinit(vc);
3044                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3045                 visual_init(vc, i, 0);
3046                 set_origin(vc);
3047                 update_attr(vc);
3048
3049                 /* If the console changed between mono <-> color, then
3050                  * the attributes in the screenbuf will be wrong.  The
3051                  * following resets all attributes to something sane.
3052                  */
3053                 if (old_was_color != vc->vc_can_do_color)
3054                         clear_buffer_attributes(vc);
3055         }
3056
3057         printk("Console: switching ");
3058         if (!deflt)
3059                 printk("consoles %d-%d ", first+1, last+1);
3060         if (j >= 0) {
3061                 struct vc_data *vc = vc_cons[j].d;
3062
3063                 printk("to %s %s %dx%d\n",
3064                        vc->vc_can_do_color ? "colour" : "mono",
3065                        desc, vc->vc_cols, vc->vc_rows);
3066
3067                 if (k >= 0) {
3068                         vc = vc_cons[k].d;
3069                         update_screen(vc);
3070                 }
3071         } else
3072                 printk("to %s\n", desc);
3073
3074         retval = 0;
3075 err:
3076         release_console_sem();
3077         module_put(owner);
3078         return retval;
3079 };
3080
3081 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3082 static int con_is_graphics(const struct consw *csw, int first, int last)
3083 {
3084         int i, retval = 0;
3085
3086         for (i = first; i <= last; i++) {
3087                 struct vc_data *vc = vc_cons[i].d;
3088
3089                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3090                         retval = 1;
3091                         break;
3092                 }
3093         }
3094
3095         return retval;
3096 }
3097
3098 /**
3099  * unbind_con_driver - unbind a console driver
3100  * @csw: pointer to console driver to unregister
3101  * @first: first in range of consoles that @csw should be unbound from
3102  * @last: last in range of consoles that @csw should be unbound from
3103  * @deflt: should next bound console driver be default after @csw is unbound?
3104  *
3105  * To unbind a driver from all possible consoles, pass 0 as @first and
3106  * %MAX_NR_CONSOLES as @last.
3107  *
3108  * @deflt controls whether the console that ends up replacing @csw should be
3109  * the default console.
3110  *
3111  * RETURNS:
3112  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3113  * or 0 on success.
3114  */
3115 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3116 {
3117         struct module *owner = csw->owner;
3118         const struct consw *defcsw = NULL;
3119         struct con_driver *con_driver = NULL, *con_back = NULL;
3120         int i, retval = -ENODEV;
3121
3122         if (!try_module_get(owner))
3123                 return -ENODEV;
3124
3125         acquire_console_sem();
3126
3127         /* check if driver is registered and if it is unbindable */
3128         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3129                 con_driver = &registered_con_driver[i];
3130
3131                 if (con_driver->con == csw &&
3132                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3133                         retval = 0;
3134                         break;
3135                 }
3136         }
3137
3138         if (retval) {
3139                 release_console_sem();
3140                 goto err;
3141         }
3142
3143         retval = -ENODEV;
3144
3145         /* check if backup driver exists */
3146         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3147                 con_back = &registered_con_driver[i];
3148
3149                 if (con_back->con &&
3150                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3151                         defcsw = con_back->con;
3152                         retval = 0;
3153                         break;
3154                 }
3155         }
3156
3157         if (retval) {
3158                 release_console_sem();
3159                 goto err;
3160         }
3161
3162         if (!con_is_bound(csw)) {
3163                 release_console_sem();
3164                 goto err;
3165         }
3166
3167         first = max(first, con_driver->first);
3168         last = min(last, con_driver->last);
3169
3170         for (i = first; i <= last; i++) {
3171                 if (con_driver_map[i] == csw) {
3172                         module_put(csw->owner);
3173                         con_driver_map[i] = NULL;
3174                 }
3175         }
3176
3177         if (!con_is_bound(defcsw)) {
3178                 const struct consw *defconsw = conswitchp;
3179
3180                 defcsw->con_startup();
3181                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3182                 /*
3183                  * vgacon may change the default driver to point
3184                  * to dummycon, we restore it here...
3185                  */
3186                 conswitchp = defconsw;
3187         }
3188
3189         if (!con_is_bound(csw))
3190                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3191
3192         release_console_sem();
3193         /* ignore return value, binding should not fail */
3194         bind_con_driver(defcsw, first, last, deflt);
3195 err:
3196         module_put(owner);
3197         return retval;
3198
3199 }
3200 EXPORT_SYMBOL(unbind_con_driver);
3201
3202 static int vt_bind(struct con_driver *con)
3203 {
3204         const struct consw *defcsw = NULL, *csw = NULL;
3205         int i, more = 1, first = -1, last = -1, deflt = 0;
3206
3207         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3208             con_is_graphics(con->con, con->first, con->last))
3209                 goto err;
3210
3211         csw = con->con;
3212
3213         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3214                 struct con_driver *con = &registered_con_driver[i];
3215
3216                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3217                         defcsw = con->con;
3218                         break;
3219                 }
3220         }
3221
3222         if (!defcsw)
3223                 goto err;
3224
3225         while (more) {
3226                 more = 0;
3227
3228                 for (i = con->first; i <= con->last; i++) {
3229                         if (con_driver_map[i] == defcsw) {
3230                                 if (first == -1)
3231                                         first = i;
3232                                 last = i;
3233                                 more = 1;
3234                         } else if (first != -1)
3235                                 break;
3236                 }
3237
3238                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3239                         deflt = 1;
3240
3241                 if (first != -1)
3242                         bind_con_driver(csw, first, last, deflt);
3243
3244                 first = -1;
3245                 last = -1;
3246                 deflt = 0;
3247         }
3248
3249 err:
3250         return 0;
3251 }
3252
3253 static int vt_unbind(struct con_driver *con)
3254 {
3255         const struct consw *csw = NULL;
3256         int i, more = 1, first = -1, last = -1, deflt = 0;
3257
3258         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3259             con_is_graphics(con->con, con->first, con->last))
3260                 goto err;
3261
3262         csw = con->con;
3263
3264         while (more) {
3265                 more = 0;
3266
3267                 for (i = con->first; i <= con->last; i++) {
3268                         if (con_driver_map[i] == csw) {
3269                                 if (first == -1)
3270                                         first = i;
3271                                 last = i;
3272                                 more = 1;
3273                         } else if (first != -1)
3274                                 break;
3275                 }
3276
3277                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3278                         deflt = 1;
3279
3280                 if (first != -1)
3281                         unbind_con_driver(csw, first, last, deflt);
3282
3283                 first = -1;
3284                 last = -1;
3285                 deflt = 0;
3286         }
3287
3288 err:
3289         return 0;
3290 }
3291 #else
3292 static inline int vt_bind(struct con_driver *con)
3293 {
3294         return 0;
3295 }
3296 static inline int vt_unbind(struct con_driver *con)
3297 {
3298         return 0;
3299 }
3300 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3301
3302 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3303                           const char *buf, size_t count)
3304 {
3305         struct con_driver *con = dev_get_drvdata(dev);
3306         int bind = simple_strtoul(buf, NULL, 0);
3307
3308         if (bind)
3309                 vt_bind(con);
3310         else
3311                 vt_unbind(con);
3312
3313         return count;
3314 }
3315
3316 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3317                          char *buf)
3318 {
3319         struct con_driver *con = dev_get_drvdata(dev);
3320         int bind = con_is_bound(con->con);
3321
3322         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3323 }
3324
3325 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3326                          char *buf)
3327 {
3328         struct con_driver *con = dev_get_drvdata(dev);
3329
3330         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3331                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3332                          con->desc);
3333
3334 }
3335
3336 static struct device_attribute device_attrs[] = {
3337         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3338         __ATTR(name, S_IRUGO, show_name, NULL),
3339 };
3340
3341 static int vtconsole_init_device(struct con_driver *con)
3342 {
3343         int i;
3344         int error = 0;
3345
3346         con->flag |= CON_DRIVER_FLAG_ATTR;
3347         dev_set_drvdata(con->dev, con);
3348         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3349                 error = device_create_file(con->dev, &device_attrs[i]);
3350                 if (error)
3351                         break;
3352         }
3353
3354         if (error) {
3355                 while (--i >= 0)
3356                         device_remove_file(con->dev, &device_attrs[i]);
3357                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3358         }
3359
3360         return error;
3361 }
3362
3363 static void vtconsole_deinit_device(struct con_driver *con)
3364 {
3365         int i;
3366
3367         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3368                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3369                         device_remove_file(con->dev, &device_attrs[i]);
3370                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3371         }
3372 }
3373
3374 /**
3375  * con_is_bound - checks if driver is bound to the console
3376  * @csw: console driver
3377  *
3378  * RETURNS: zero if unbound, nonzero if bound
3379  *
3380  * Drivers can call this and if zero, they should release
3381  * all resources allocated on con_startup()
3382  */
3383 int con_is_bound(const struct consw *csw)
3384 {
3385         int i, bound = 0;
3386
3387         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3388                 if (con_driver_map[i] == csw) {
3389                         bound = 1;
3390                         break;
3391                 }
3392         }
3393
3394         return bound;
3395 }
3396 EXPORT_SYMBOL(con_is_bound);
3397
3398 /**
3399  * register_con_driver - register console driver to console layer
3400  * @csw: console driver
3401  * @first: the first console to take over, minimum value is 0
3402  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3403  *
3404  * DESCRIPTION: This function registers a console driver which can later
3405  * bind to a range of consoles specified by @first and @last. It will
3406  * also initialize the console driver by calling con_startup().
3407  */
3408 int register_con_driver(const struct consw *csw, int first, int last)
3409 {
3410         struct module *owner = csw->owner;
3411         struct con_driver *con_driver;
3412         const char *desc;
3413         int i, retval = 0;
3414
3415         if (!try_module_get(owner))
3416                 return -ENODEV;
3417
3418         acquire_console_sem();
3419
3420         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3421                 con_driver = &registered_con_driver[i];
3422
3423                 /* already registered */
3424                 if (con_driver->con == csw)
3425                         retval = -EINVAL;
3426         }
3427
3428         if (retval)
3429                 goto err;
3430
3431         desc = csw->con_startup();
3432
3433         if (!desc)
3434                 goto err;
3435
3436         retval = -EINVAL;
3437
3438         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3439                 con_driver = &registered_con_driver[i];
3440
3441                 if (con_driver->con == NULL) {
3442                         con_driver->con = csw;
3443                         con_driver->desc = desc;
3444                         con_driver->node = i;
3445                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3446                                            CON_DRIVER_FLAG_INIT;
3447                         con_driver->first = first;
3448                         con_driver->last = last;
3449                         retval = 0;
3450                         break;
3451                 }
3452         }
3453
3454         if (retval)
3455                 goto err;
3456
3457         con_driver->dev = device_create(vtconsole_class, NULL,
3458                                                 MKDEV(0, con_driver->node),
3459                                                 NULL, "vtcon%i",
3460                                                 con_driver->node);
3461
3462         if (IS_ERR(con_driver->dev)) {
3463                 printk(KERN_WARNING "Unable to create device for %s; "
3464                        "errno = %ld\n", con_driver->desc,
3465                        PTR_ERR(con_driver->dev));
3466                 con_driver->dev = NULL;
3467         } else {
3468                 vtconsole_init_device(con_driver);
3469         }
3470
3471 err:
3472         release_console_sem();
3473         module_put(owner);
3474         return retval;
3475 }
3476 EXPORT_SYMBOL(register_con_driver);
3477
3478 /**
3479  * unregister_con_driver - unregister console driver from console layer
3480  * @csw: console driver
3481  *
3482  * DESCRIPTION: All drivers that registers to the console layer must
3483  * call this function upon exit, or if the console driver is in a state
3484  * where it won't be able to handle console services, such as the
3485  * framebuffer console without loaded framebuffer drivers.
3486  *
3487  * The driver must unbind first prior to unregistration.
3488  */
3489 int unregister_con_driver(const struct consw *csw)
3490 {
3491         int i, retval = -ENODEV;
3492
3493         acquire_console_sem();
3494
3495         /* cannot unregister a bound driver */
3496         if (con_is_bound(csw))
3497                 goto err;
3498
3499         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3500                 struct con_driver *con_driver = &registered_con_driver[i];
3501
3502                 if (con_driver->con == csw &&
3503                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3504                         vtconsole_deinit_device(con_driver);
3505                         device_destroy(vtconsole_class,
3506                                        MKDEV(0, con_driver->node));
3507                         con_driver->con = NULL;
3508                         con_driver->desc = NULL;
3509                         con_driver->dev = NULL;
3510                         con_driver->node = 0;
3511                         con_driver->flag = 0;
3512                         con_driver->first = 0;
3513                         con_driver->last = 0;
3514                         retval = 0;
3515                         break;
3516                 }
3517         }
3518 err:
3519         release_console_sem();
3520         return retval;
3521 }
3522 EXPORT_SYMBOL(unregister_con_driver);
3523
3524 /*
3525  *      If we support more console drivers, this function is used
3526  *      when a driver wants to take over some existing consoles
3527  *      and become default driver for newly opened ones.
3528  *
3529  *      take_over_console is basically a register followed by unbind
3530  */
3531 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3532 {
3533         int err;
3534
3535         err = register_con_driver(csw, first, last);
3536
3537         if (!err)
3538                 bind_con_driver(csw, first, last, deflt);
3539
3540         return err;
3541 }
3542
3543 /*
3544  * give_up_console is a wrapper to unregister_con_driver. It will only
3545  * work if driver is fully unbound.
3546  */
3547 void give_up_console(const struct consw *csw)
3548 {
3549         unregister_con_driver(csw);
3550 }
3551
3552 static int __init vtconsole_class_init(void)
3553 {
3554         int i;
3555
3556         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3557         if (IS_ERR(vtconsole_class)) {
3558                 printk(KERN_WARNING "Unable to create vt console class; "
3559                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3560                 vtconsole_class = NULL;
3561         }
3562
3563         /* Add system drivers to sysfs */
3564         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3565                 struct con_driver *con = &registered_con_driver[i];
3566
3567                 if (con->con && !con->dev) {
3568                         con->dev = device_create(vtconsole_class, NULL,
3569                                                          MKDEV(0, con->node),
3570                                                          NULL, "vtcon%i",
3571                                                          con->node);
3572
3573                         if (IS_ERR(con->dev)) {
3574                                 printk(KERN_WARNING "Unable to create "
3575                                        "device for %s; errno = %ld\n",
3576                                        con->desc, PTR_ERR(con->dev));
3577                                 con->dev = NULL;
3578                         } else {
3579                                 vtconsole_init_device(con);
3580                         }
3581                 }
3582         }
3583
3584         return 0;
3585 }
3586 postcore_initcall(vtconsole_class_init);
3587
3588 #endif
3589
3590 /*
3591  *      Screen blanking
3592  */
3593
3594 static int set_vesa_blanking(char __user *p)
3595 {
3596         unsigned int mode;
3597
3598         if (get_user(mode, p + 1))
3599                 return -EFAULT;
3600
3601         vesa_blank_mode = (mode < 4) ? mode : 0;
3602         return 0;
3603 }
3604
3605 void do_blank_screen(int entering_gfx)
3606 {
3607         struct vc_data *vc = vc_cons[fg_console].d;
3608         int i;
3609
3610         WARN_CONSOLE_UNLOCKED();
3611
3612         if (console_blanked) {
3613                 if (blank_state == blank_vesa_wait) {
3614                         blank_state = blank_off;
3615                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3616                 }
3617                 return;
3618         }
3619
3620         /* entering graphics mode? */
3621         if (entering_gfx) {
3622                 hide_cursor(vc);
3623                 save_screen(vc);
3624                 vc->vc_sw->con_blank(vc, -1, 1);
3625                 console_blanked = fg_console + 1;
3626                 blank_state = blank_off;
3627                 set_origin(vc);
3628                 return;
3629         }
3630
3631         if (blank_state != blank_normal_wait)
3632                 return;
3633         blank_state = blank_off;
3634
3635         /* don't blank graphics */
3636         if (vc->vc_mode != KD_TEXT) {
3637                 console_blanked = fg_console + 1;
3638                 return;
3639         }
3640
3641         hide_cursor(vc);
3642         del_timer_sync(&console_timer);
3643         blank_timer_expired = 0;
3644
3645         save_screen(vc);
3646         /* In case we need to reset origin, blanking hook returns 1 */
3647         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3648         console_blanked = fg_console + 1;
3649         if (i)
3650                 set_origin(vc);
3651
3652         if (console_blank_hook && console_blank_hook(1))
3653                 return;
3654
3655         if (vesa_off_interval && vesa_blank_mode) {
3656                 blank_state = blank_vesa_wait;
3657                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3658         }
3659 }
3660 EXPORT_SYMBOL(do_blank_screen);
3661
3662 /*
3663  * Called by timer as well as from vt_console_driver
3664  */
3665 void do_unblank_screen(int leaving_gfx)
3666 {
3667         struct vc_data *vc;
3668
3669         /* This should now always be called from a "sane" (read: can schedule)
3670          * context for the sake of the low level drivers, except in the special
3671          * case of oops_in_progress
3672          */
3673         if (!oops_in_progress)
3674                 might_sleep();
3675
3676         WARN_CONSOLE_UNLOCKED();
3677
3678         ignore_poke = 0;
3679         if (!console_blanked)
3680                 return;
3681         if (!vc_cons_allocated(fg_console)) {
3682                 /* impossible */
3683                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3684                 return;
3685         }
3686         vc = vc_cons[fg_console].d;
3687         if (vc->vc_mode != KD_TEXT)
3688                 return; /* but leave console_blanked != 0 */
3689
3690         if (blankinterval) {
3691                 mod_timer(&console_timer, jiffies + blankinterval);
3692                 blank_state = blank_normal_wait;
3693         }
3694
3695         console_blanked = 0;
3696         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3697                 /* Low-level driver cannot restore -> do it ourselves */
3698                 update_screen(vc);
3699         if (console_blank_hook)
3700                 console_blank_hook(0);
3701         set_palette(vc);
3702         set_cursor(vc);
3703 }
3704 EXPORT_SYMBOL(do_unblank_screen);
3705
3706 /*
3707  * This is called by the outside world to cause a forced unblank, mostly for
3708  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3709  * call it with 1 as an argument and so force a mode restore... that may kill
3710  * X or at least garbage the screen but would also make the Oops visible...
3711  */
3712 void unblank_screen(void)
3713 {
3714         do_unblank_screen(0);
3715 }
3716
3717 /*
3718  * We defer the timer blanking to work queue so it can take the console mutex
3719  * (console operations can still happen at irq time, but only from printk which
3720  * has the console mutex. Not perfect yet, but better than no locking
3721  */
3722 static void blank_screen_t(unsigned long dummy)
3723 {
3724         if (unlikely(!keventd_up())) {
3725                 mod_timer(&console_timer, jiffies + blankinterval);
3726                 return;
3727         }
3728         blank_timer_expired = 1;
3729         schedule_work(&console_work);
3730 }
3731
3732 void poke_blanked_console(void)
3733 {
3734         WARN_CONSOLE_UNLOCKED();
3735
3736         /* Add this so we quickly catch whoever might call us in a non
3737          * safe context. Nowadays, unblank_screen() isn't to be called in
3738          * atomic contexts and is allowed to schedule (with the special case
3739          * of oops_in_progress, but that isn't of any concern for this
3740          * function. --BenH.
3741          */
3742         might_sleep();
3743
3744         /* This isn't perfectly race free, but a race here would be mostly harmless,
3745          * at worse, we'll do a spurrious blank and it's unlikely
3746          */
3747         del_timer(&console_timer);
3748         blank_timer_expired = 0;
3749
3750         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3751                 return;
3752         if (console_blanked)
3753                 unblank_screen();
3754         else if (blankinterval) {
3755                 mod_timer(&console_timer, jiffies + blankinterval);
3756                 blank_state = blank_normal_wait;
3757         }
3758 }
3759
3760 /*
3761  *      Palettes
3762  */
3763
3764 static void set_palette(struct vc_data *vc)
3765 {
3766         WARN_CONSOLE_UNLOCKED();
3767
3768         if (vc->vc_mode != KD_GRAPHICS)
3769                 vc->vc_sw->con_set_palette(vc, color_table);
3770 }
3771
3772 static int set_get_cmap(unsigned char __user *arg, int set)
3773 {
3774     int i, j, k;
3775
3776     WARN_CONSOLE_UNLOCKED();
3777
3778     for (i = 0; i < 16; i++)
3779         if (set) {
3780             get_user(default_red[i], arg++);
3781             get_user(default_grn[i], arg++);
3782             get_user(default_blu[i], arg++);
3783         } else {
3784             put_user(default_red[i], arg++);
3785             put_user(default_grn[i], arg++);
3786             put_user(default_blu[i], arg++);
3787         }
3788     if (set) {
3789         for (i = 0; i < MAX_NR_CONSOLES; i++)
3790             if (vc_cons_allocated(i)) {
3791                 for (j = k = 0; j < 16; j++) {
3792                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3793                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3794                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3795                 }
3796                 set_palette(vc_cons[i].d);
3797             }
3798     }
3799     return 0;
3800 }
3801
3802 /*
3803  * Load palette into the DAC registers. arg points to a colour
3804  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3805  */
3806
3807 int con_set_cmap(unsigned char __user *arg)
3808 {
3809         int rc;
3810
3811         acquire_console_sem();
3812         rc = set_get_cmap (arg,1);
3813         release_console_sem();
3814
3815         return rc;
3816 }
3817
3818 int con_get_cmap(unsigned char __user *arg)
3819 {
3820         int rc;
3821
3822         acquire_console_sem();
3823         rc = set_get_cmap (arg,0);
3824         release_console_sem();
3825
3826         return rc;
3827 }
3828
3829 void reset_palette(struct vc_data *vc)
3830 {
3831         int j, k;
3832         for (j=k=0; j<16; j++) {
3833                 vc->vc_palette[k++] = default_red[j];
3834                 vc->vc_palette[k++] = default_grn[j];
3835                 vc->vc_palette[k++] = default_blu[j];
3836         }
3837         set_palette(vc);
3838 }
3839
3840 /*
3841  *  Font switching
3842  *
3843  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3844  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3845  *  depending on width) reserved for each character which is kinda wasty, but
3846  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3847  *  is upto the actual low-level console-driver convert data into its favorite
3848  *  format (maybe we should add a `fontoffset' field to the `display'
3849  *  structure so we won't have to convert the fontdata all the time.
3850  *  /Jes
3851  */
3852
3853 #define max_font_size 65536
3854
3855 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3856 {
3857         struct console_font font;
3858         int rc = -EINVAL;
3859         int c;
3860
3861         if (vc->vc_mode != KD_TEXT)
3862                 return -EINVAL;
3863
3864         if (op->data) {
3865                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3866                 if (!font.data)
3867                         return -ENOMEM;
3868         } else
3869                 font.data = NULL;
3870
3871         acquire_console_sem();
3872         if (vc->vc_sw->con_font_get)
3873                 rc = vc->vc_sw->con_font_get(vc, &font);
3874         else
3875                 rc = -ENOSYS;
3876         release_console_sem();
3877
3878         if (rc)
3879                 goto out;
3880
3881         c = (font.width+7)/8 * 32 * font.charcount;
3882
3883         if (op->data && font.charcount > op->charcount)
3884                 rc = -ENOSPC;
3885         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3886                 if (font.width > op->width || font.height > op->height)
3887                         rc = -ENOSPC;
3888         } else {
3889                 if (font.width != 8)
3890                         rc = -EIO;
3891                 else if ((op->height && font.height > op->height) ||
3892                          font.height > 32)
3893                         rc = -ENOSPC;
3894         }
3895         if (rc)
3896                 goto out;
3897
3898         op->height = font.height;
3899         op->width = font.width;
3900         op->charcount = font.charcount;
3901
3902         if (op->data && copy_to_user(op->data, font.data, c))
3903                 rc = -EFAULT;
3904
3905 out:
3906         kfree(font.data);
3907         return rc;
3908 }
3909
3910 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3911 {
3912         struct console_font font;
3913         int rc = -EINVAL;
3914         int size;
3915
3916         if (vc->vc_mode != KD_TEXT)
3917                 return -EINVAL;
3918         if (!op->data)
3919                 return -EINVAL;
3920         if (op->charcount > 512)
3921                 return -EINVAL;
3922         if (!op->height) {              /* Need to guess font height [compat] */
3923                 int h, i;
3924                 u8 __user *charmap = op->data;
3925                 u8 tmp;
3926
3927                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3928                    so that we can get rid of this soon */
3929                 if (!(op->flags & KD_FONT_FLAG_OLD))
3930                         return -EINVAL;
3931                 for (h = 32; h > 0; h--)
3932                         for (i = 0; i < op->charcount; i++) {
3933                                 if (get_user(tmp, &charmap[32*i+h-1]))
3934                                         return -EFAULT;
3935                                 if (tmp)
3936                                         goto nonzero;
3937                         }
3938                 return -EINVAL;
3939         nonzero:
3940                 op->height = h;
3941         }
3942         if (op->width <= 0 || op->width > 32 || op->height > 32)
3943                 return -EINVAL;
3944         size = (op->width+7)/8 * 32 * op->charcount;
3945         if (size > max_font_size)
3946                 return -ENOSPC;
3947         font.charcount = op->charcount;
3948         font.height = op->height;
3949         font.width = op->width;
3950         font.data = kmalloc(size, GFP_KERNEL);
3951         if (!font.data)
3952                 return -ENOMEM;
3953         if (copy_from_user(font.data, op->data, size)) {
3954                 kfree(font.data);
3955                 return -EFAULT;
3956         }
3957         acquire_console_sem();
3958         if (vc->vc_sw->con_font_set)
3959                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3960         else
3961                 rc = -ENOSYS;
3962         release_console_sem();
3963         kfree(font.data);
3964         return rc;
3965 }
3966
3967 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3968 {
3969         struct console_font font = {.width = op->width, .height = op->height};
3970         char name[MAX_FONT_NAME];
3971         char *s = name;
3972         int rc;
3973
3974         if (vc->vc_mode != KD_TEXT)
3975                 return -EINVAL;
3976
3977         if (!op->data)
3978                 s = NULL;
3979         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3980                 return -EFAULT;
3981         else
3982                 name[MAX_FONT_NAME - 1] = 0;
3983
3984         acquire_console_sem();
3985         if (vc->vc_sw->con_font_default)
3986                 rc = vc->vc_sw->con_font_default(vc, &font, s);
3987         else
3988                 rc = -ENOSYS;
3989         release_console_sem();
3990         if (!rc) {
3991                 op->width = font.width;
3992                 op->height = font.height;
3993         }
3994         return rc;
3995 }
3996
3997 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3998 {
3999         int con = op->height;
4000         int rc;
4001
4002         if (vc->vc_mode != KD_TEXT)
4003                 return -EINVAL;
4004
4005         acquire_console_sem();
4006         if (!vc->vc_sw->con_font_copy)
4007                 rc = -ENOSYS;
4008         else if (con < 0 || !vc_cons_allocated(con))
4009                 rc = -ENOTTY;
4010         else if (con == vc->vc_num)     /* nothing to do */
4011                 rc = 0;
4012         else
4013                 rc = vc->vc_sw->con_font_copy(vc, con);
4014         release_console_sem();
4015         return rc;
4016 }
4017
4018 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4019 {
4020         switch (op->op) {
4021         case KD_FONT_OP_SET:
4022                 return con_font_set(vc, op);
4023         case KD_FONT_OP_GET:
4024                 return con_font_get(vc, op);
4025         case KD_FONT_OP_SET_DEFAULT:
4026                 return con_font_default(vc, op);
4027         case KD_FONT_OP_COPY:
4028                 return con_font_copy(vc, op);
4029         }
4030         return -ENOSYS;
4031 }
4032
4033 /*
4034  *      Interface exported to selection and vcs.
4035  */
4036
4037 /* used by selection */
4038 u16 screen_glyph(struct vc_data *vc, int offset)
4039 {
4040         u16 w = scr_readw(screenpos(vc, offset, 1));
4041         u16 c = w & 0xff;
4042
4043         if (w & vc->vc_hi_font_mask)
4044                 c |= 0x100;
4045         return c;
4046 }
4047 EXPORT_SYMBOL_GPL(screen_glyph);
4048
4049 /* used by vcs - note the word offset */
4050 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4051 {
4052         return screenpos(vc, 2 * w_offset, viewed);
4053 }
4054
4055 void getconsxy(struct vc_data *vc, unsigned char *p)
4056 {
4057         p[0] = vc->vc_x;
4058         p[1] = vc->vc_y;
4059 }
4060
4061 void putconsxy(struct vc_data *vc, unsigned char *p)
4062 {
4063         hide_cursor(vc);
4064         gotoxy(vc, p[0], p[1]);
4065         set_cursor(vc);
4066 }
4067
4068 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4069 {
4070         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4071                 return softcursor_original;
4072         return scr_readw(org);
4073 }
4074
4075 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4076 {
4077         scr_writew(val, org);
4078         if ((unsigned long)org == vc->vc_pos) {
4079                 softcursor_original = -1;
4080                 add_softcursor(vc);
4081         }
4082 }
4083
4084 /*
4085  *      Visible symbols for modules
4086  */
4087
4088 EXPORT_SYMBOL(color_table);
4089 EXPORT_SYMBOL(default_red);
4090 EXPORT_SYMBOL(default_grn);
4091 EXPORT_SYMBOL(default_blu);
4092 EXPORT_SYMBOL(update_region);
4093 EXPORT_SYMBOL(redraw_screen);
4094 EXPORT_SYMBOL(vc_resize);
4095 EXPORT_SYMBOL(fg_console);
4096 EXPORT_SYMBOL(console_blank_hook);
4097 EXPORT_SYMBOL(console_blanked);
4098 EXPORT_SYMBOL(vc_cons);
4099 #ifndef VT_SINGLE_DRIVER
4100 EXPORT_SYMBOL(take_over_console);
4101 EXPORT_SYMBOL(give_up_console);
4102 #endif