drivers/char/vt.c

   1 /*
   2  *  linux/drivers/char/vt.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * Hopefully this will be a rather complete VT102 implementation.
   9  *
  10  * Beeping thanks to John T Kohl.
  11  *
  12  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  13  *   Chars, and VT100 enhancements by Peter MacDonald.
  14  *
  15  * Copy and paste function by Andrew Haylett,
  16  *   some enhancements by Alessandro Rubini.
  17  *
  18  * Code to check for different video-cards mostly by Galen Hunt,
  19  * <g-hunt@ee.utah.edu>
  20  *
  21  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  22  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  23  *
  24  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  25  * Resizing of consoles, aeb, 940926
  26  *
  27  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  28  * <poe@daimi.aau.dk>
  29  *
  30  * User-defined bell sound, new setterm control sequences and printk
  31  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  32  *
  33  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  34  *
  35  * Merge with the abstract console driver by Geert Uytterhoeven
  36  * <geert@linux-m68k.org>, Jan 1997.
  37  *
  38  *   Original m68k console driver modifications by
  39  *
  40  *     - Arno Griffioen <arno@usn.nl>
  41  *     - David Carter <carter@cs.bris.ac.uk>
  42  *
  43  *   The abstract console driver provides a generic interface for a text
  44  *   console. It supports VGA text mode, frame buffer based graphical consoles
  45  *   and special graphics processors that are only accessible through some
  46  *   registers (e.g. a TMS340x0 GSP).
  47  *
  48  *   The interface to the hardware is specified using a special structure
  49  *   (struct consw) which contains function pointers to console operations
  50  *   (see <linux/console.h> for more information).
  51  *
  52  * Support for changeable cursor shape
  53  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  54  *
  55  * Ported to i386 and con_scrolldelta fixed
  56  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  57  *
  58  * Resurrected character buffers in videoram plus lots of other trickery
  59  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  60  *
  61  * Removed old-style timers, introduced console_timer, made timer
  62  * deletion SMP-safe.  17Jun00, Andrew Morton
  63  *
  64  * Removed console_lock, enabled interrupts across all console operations
  65  * 13 March 2001, Andrew Morton
  66  *
  67  * Fixed UTF-8 mode so alternate charset modes always work according
  68  * to control sequences interpreted in do_con_trol function
  69  * preserving backward VT100 semigraphics compatibility,
  70  * malformed UTF sequences represented as sequences of replacement glyphs,
  71  * original codes or '?' as a last resort if replacement glyph is undefined
  72  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  73  */
  74
  75 #include <linux/module.h>
  76 #include <linux/types.h>
  77 #include <linux/sched.h>
  78 #include <linux/tty.h>
  79 #include <linux/tty_flip.h>
  80 #include <linux/kernel.h>
  81 #include <linux/string.h>
  82 #include <linux/errno.h>
  83 #include <linux/kd.h>
  84 #include <linux/slab.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/smp_lock.h>
  93 #include <linux/tiocl.h>
  94 #include <linux/kbd_kern.h>
  95 #include <linux/consolemap.h>
  96 #include <linux/timer.h>
  97 #include <linux/interrupt.h>
  98 #include <linux/workqueue.h>
  99 #include <linux/pm.h>
 100 #include <linux/font.h>
 101 #include <linux/bitops.h>
 102 #include <linux/notifier.h>
 103 #include <linux/device.h>
 104 #include <linux/io.h>
 105 #include <asm/system.h>
 106 #include <linux/uaccess.h>
 107 #include <linux/kdb.h>
 108 #include <linux/ctype.h>
 109
 110 #define MAX_NR_CON_DRIVER 16
 111
 112 #define CON_DRIVER_FLAG_MODULE 1
 113 #define CON_DRIVER_FLAG_INIT   2
 114 #define CON_DRIVER_FLAG_ATTR   4
 115
 116 struct con_driver {
 117         const struct consw *con;
 118         const char *desc;
 119         struct device *dev;
 120         int node;
 121         int first;
 122         int last;
 123         int flag;
 124 };
 125
 126 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 127 const struct consw *conswitchp;
 128
 129 /* A bitmap for codes <32. A bit of 1 indicates that the code
 130  * corresponding to that bit number invokes some special action
 131  * (such as cursor movement) and should not be displayed as a
 132  * glyph unless the disp_ctrl mode is explicitly enabled.
 133  */
 134 #define CTRL_ACTION 0x0d00ff81
 135 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 136
 137 /*
 138  * Here is the default bell parameters: 750HZ, 1/8th of a second
 139  */
 140 #define DEFAULT_BELL_PITCH      750
 141 #define DEFAULT_BELL_DURATION   (HZ/8)
 142
 143 struct vc vc_cons [MAX_NR_CONSOLES];
 144
 145 #ifndef VT_SINGLE_DRIVER
 146 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 147 #endif
 148
 149 static int con_open(struct tty_struct *, struct file *);
 150 static void vc_init(struct vc_data *vc, unsigned int rows,
 151                     unsigned int cols, int do_clear);
 152 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 153 static void save_cur(struct vc_data *vc);
 154 static void reset_terminal(struct vc_data *vc, int do_clear);
 155 static void con_flush_chars(struct tty_struct *tty);
 156 static int set_vesa_blanking(char __user *p);
 157 static void set_cursor(struct vc_data *vc);
 158 static void hide_cursor(struct vc_data *vc);
 159 static void console_callback(struct work_struct *ignored);
 160 static void blank_screen_t(unsigned long dummy);
 161 static void set_palette(struct vc_data *vc);
 162
 163 static int printable;           /* Is console ready for printing? */
 164 int default_utf8 = true;
 165 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 166 int global_cursor_default = -1;
 167 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 168
 169 static int cur_default = CUR_DEFAULT;
 170 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 171
 172 /*
 173  * ignore_poke: don't unblank the screen when things are typed.  This is
 174  * mainly for the privacy of braille terminal users.
 175  */
 176 static int ignore_poke;
 177
 178 int do_poke_blanked_console;
 179 int console_blanked;
 180
 181 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 182 static int vesa_off_interval;
 183 static int blankinterval = 10*60;
 184 core_param(consoleblank, blankinterval, int, 0444);
 185
 186 static DECLARE_WORK(console_work, console_callback);
 187
 188 /*
 189  * fg_console is the current virtual console,
 190  * last_console is the last used one,
 191  * want_console is the console we want to switch to,
 192  * saved_* variants are for save/restore around kernel debugger enter/leave
 193  */
 194 int fg_console;
 195 int last_console;
 196 int want_console = -1;
 197 static int saved_fg_console;
 198 static int saved_last_console;
 199 static int saved_want_console;
 200 static int saved_vc_mode;
 201 static int saved_console_blanked;
 202
 203 /*
 204  * For each existing display, we have a pointer to console currently visible
 205  * on that display, allowing consoles other than fg_console to be refreshed
 206  * appropriately. Unless the low-level driver supplies its own display_fg
 207  * variable, we use this one for the "master display".
 208  */
 209 static struct vc_data *master_display_fg;
 210
 211 /*
 212  * Unfortunately, we need to delay tty echo when we're currently writing to the
 213  * console since the code is (and always was) not re-entrant, so we schedule
 214  * all flip requests to process context with schedule-task() and run it from
 215  * console_callback().
 216  */
 217
 218 /*
 219  * For the same reason, we defer scrollback to the console callback.
 220  */
 221 static int scrollback_delta;
 222
 223 /*
 224  * Hook so that the power management routines can (un)blank
 225  * the console on our behalf.
 226  */
 227 int (*console_blank_hook)(int);
 228
 229 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 230 static int blank_state;
 231 static int blank_timer_expired;
 232 enum {
 233         blank_off = 0,
 234         blank_normal_wait,
 235         blank_vesa_wait,
 236 };
 237
 238 /*
 239  * Notifier list for console events.
 240  */
 241 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 242
 243 int register_vt_notifier(struct notifier_block *nb)
 244 {
 245         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 246 }
 247 EXPORT_SYMBOL_GPL(register_vt_notifier);
 248
 249 int unregister_vt_notifier(struct notifier_block *nb)
 250 {
 251         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 252 }
 253 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 254
 255 static void notify_write(struct vc_data *vc, unsigned int unicode)
 256 {
 257         struct vt_notifier_param param = { .vc = vc, unicode = unicode };
 258         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 259 }
 260
 261 static void notify_update(struct vc_data *vc)
 262 {
 263         struct vt_notifier_param param = { .vc = vc };
 264         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 265 }
 266 /*
 267  *      Low-Level Functions
 268  */
 269
 270 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 271
 272 #ifdef VT_BUF_VRAM_ONLY
 273 #define DO_UPDATE(vc)   0
 274 #else
 275 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 276 #endif
 277
 278 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 279 {
 280         unsigned short *p;
 281
 282         if (!viewed)
 283                 p = (unsigned short *)(vc->vc_origin + offset);
 284         else if (!vc->vc_sw->con_screen_pos)
 285                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 286         else
 287                 p = vc->vc_sw->con_screen_pos(vc, offset);
 288         return p;
 289 }
 290
 291 /* Called  from the keyboard irq path.. */
 292 static inline void scrolldelta(int lines)
 293 {
 294         /* FIXME */
 295         /* scrolldelta needs some kind of consistency lock, but the BKL was
 296            and still is not protecting versus the scheduled back end */
 297         scrollback_delta += lines;
 298         schedule_console_callback();
 299 }
 300
 301 void schedule_console_callback(void)
 302 {
 303         schedule_work(&console_work);
 304 }
 305
 306 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 307 {
 308         unsigned short *d, *s;
 309
 310         if (t+nr >= b)
 311                 nr = b - t - 1;
 312         if (b > vc->vc_rows || t >= b || nr < 1)
 313                 return;
 314         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 315                 return;
 316         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 317         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 318         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 319         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 320                     vc->vc_size_row * nr);
 321 }
 322
 323 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 324 {
 325         unsigned short *s;
 326         unsigned int step;
 327
 328         if (t+nr >= b)
 329                 nr = b - t - 1;
 330         if (b > vc->vc_rows || t >= b || nr < 1)
 331                 return;
 332         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 333                 return;
 334         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 335         step = vc->vc_cols * nr;
 336         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 337         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 338 }
 339
 340 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 341 {
 342 #ifndef VT_BUF_VRAM_ONLY
 343         unsigned int xx, yy, offset;
 344         u16 *p;
 345
 346         p = (u16 *) start;
 347         if (!vc->vc_sw->con_getxy) {
 348                 offset = (start - vc->vc_origin) / 2;
 349                 xx = offset % vc->vc_cols;
 350                 yy = offset / vc->vc_cols;
 351         } else {
 352                 int nxx, nyy;
 353                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 354                 xx = nxx; yy = nyy;
 355         }
 356         for(;;) {
 357                 u16 attrib = scr_readw(p) & 0xff00;
 358                 int startx = xx;
 359                 u16 *q = p;
 360                 while (xx < vc->vc_cols && count) {
 361                         if (attrib != (scr_readw(p) & 0xff00)) {
 362                                 if (p > q)
 363                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 364                                 startx = xx;
 365                                 q = p;
 366                                 attrib = scr_readw(p) & 0xff00;
 367                         }
 368                         p++;
 369                         xx++;
 370                         count--;
 371                 }
 372                 if (p > q)
 373                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 374                 if (!count)
 375                         break;
 376                 xx = 0;
 377                 yy++;
 378                 if (vc->vc_sw->con_getxy) {
 379                         p = (u16 *)start;
 380                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 381                 }
 382         }
 383 #endif
 384 }
 385
 386 void update_region(struct vc_data *vc, unsigned long start, int count)
 387 {
 388         WARN_CONSOLE_UNLOCKED();
 389
 390         if (DO_UPDATE(vc)) {
 391                 hide_cursor(vc);
 392                 do_update_region(vc, start, count);
 393                 set_cursor(vc);
 394         }
 395 }
 396
 397 /* Structure of attributes is hardware-dependent */
 398
 399 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 400     u8 _underline, u8 _reverse, u8 _italic)
 401 {
 402         if (vc->vc_sw->con_build_attr)
 403                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 404                        _blink, _underline, _reverse, _italic);
 405
 406 #ifndef VT_BUF_VRAM_ONLY
 407 /*
 408  * ++roman: I completely changed the attribute format for monochrome
 409  * mode (!can_do_color). The formerly used MDA (monochrome display
 410  * adapter) format didn't allow the combination of certain effects.
 411  * Now the attribute is just a bit vector:
 412  *  Bit 0..1: intensity (0..2)
 413  *  Bit 2   : underline
 414  *  Bit 3   : reverse
 415  *  Bit 7   : blink
 416  */
 417         {
 418         u8 a = _color;
 419         if (!vc->vc_can_do_color)
 420                 return _intensity |
 421                        (_italic ? 2 : 0) |
 422                        (_underline ? 4 : 0) |
 423                        (_reverse ? 8 : 0) |
 424                        (_blink ? 0x80 : 0);
 425         if (_italic)
 426                 a = (a & 0xF0) | vc->vc_itcolor;
 427         else if (_underline)
 428                 a = (a & 0xf0) | vc->vc_ulcolor;
 429         else if (_intensity == 0)
 430                 a = (a & 0xf0) | vc->vc_ulcolor;
 431         if (_reverse)
 432                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 433         if (_blink)
 434                 a ^= 0x80;
 435         if (_intensity == 2)
 436                 a ^= 0x08;
 437         if (vc->vc_hi_font_mask == 0x100)
 438                 a <<= 1;
 439         return a;
 440         }
 441 #else
 442         return 0;
 443 #endif
 444 }
 445
 446 static void update_attr(struct vc_data *vc)
 447 {
 448         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 449                       vc->vc_blink, vc->vc_underline,
 450                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 451         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 452 }
 453
 454 /* Note: inverting the screen twice should revert to the original state */
 455 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 456 {
 457         unsigned short *p;
 458
 459         WARN_CONSOLE_UNLOCKED();
 460
 461         count /= 2;
 462         p = screenpos(vc, offset, viewed);
 463         if (vc->vc_sw->con_invert_region)
 464                 vc->vc_sw->con_invert_region(vc, p, count);
 465 #ifndef VT_BUF_VRAM_ONLY
 466         else {
 467                 u16 *q = p;
 468                 int cnt = count;
 469                 u16 a;
 470
 471                 if (!vc->vc_can_do_color) {
 472                         while (cnt--) {
 473                             a = scr_readw(q);
 474                             a ^= 0x0800;
 475                             scr_writew(a, q);
 476                             q++;
 477                         }
 478                 } else if (vc->vc_hi_font_mask == 0x100) {
 479                         while (cnt--) {
 480                                 a = scr_readw(q);
 481                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 482                                 scr_writew(a, q);
 483                                 q++;
 484                         }
 485                 } else {
 486                         while (cnt--) {
 487                                 a = scr_readw(q);
 488                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 489                                 scr_writew(a, q);
 490                                 q++;
 491                         }
 492                 }
 493         }
 494 #endif
 495         if (DO_UPDATE(vc))
 496                 do_update_region(vc, (unsigned long) p, count);
 497 }
 498
 499 /* used by selection: complement pointer position */
 500 void complement_pos(struct vc_data *vc, int offset)
 501 {
 502         static int old_offset = -1;
 503         static unsigned short old;
 504         static unsigned short oldx, oldy;
 505
 506         WARN_CONSOLE_UNLOCKED();
 507
 508         if (old_offset != -1 && old_offset >= 0 &&
 509             old_offset < vc->vc_screenbuf_size) {
 510                 scr_writew(old, screenpos(vc, old_offset, 1));
 511                 if (DO_UPDATE(vc))
 512                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 513         }
 514
 515         old_offset = offset;
 516
 517         if (offset != -1 && offset >= 0 &&
 518             offset < vc->vc_screenbuf_size) {
 519                 unsigned short new;
 520                 unsigned short *p;
 521                 p = screenpos(vc, offset, 1);
 522                 old = scr_readw(p);
 523                 new = old ^ vc->vc_complement_mask;
 524                 scr_writew(new, p);
 525                 if (DO_UPDATE(vc)) {
 526                         oldx = (offset >> 1) % vc->vc_cols;
 527                         oldy = (offset >> 1) / vc->vc_cols;
 528                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 529                 }
 530         }
 531
 532 }
 533
 534 static void insert_char(struct vc_data *vc, unsigned int nr)
 535 {
 536         unsigned short *p, *q = (unsigned short *)vc->vc_pos;
 537
 538         p = q + vc->vc_cols - nr - vc->vc_x;
 539         while (--p >= q)
 540                 scr_writew(scr_readw(p), p + nr);
 541         scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
 542         vc->vc_need_wrap = 0;
 543         if (DO_UPDATE(vc)) {
 544                 unsigned short oldattr = vc->vc_attr;
 545                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
 546                                      vc->vc_cols - vc->vc_x - nr);
 547                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 548                 while (nr--)
 549                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
 550                 vc->vc_attr = oldattr;
 551         }
 552 }
 553
 554 static void delete_char(struct vc_data *vc, unsigned int nr)
 555 {
 556         unsigned int i = vc->vc_x;
 557         unsigned short *p = (unsigned short *)vc->vc_pos;
 558
 559         while (++i <= vc->vc_cols - nr) {
 560                 scr_writew(scr_readw(p+nr), p);
 561                 p++;
 562         }
 563         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 564         vc->vc_need_wrap = 0;
 565         if (DO_UPDATE(vc)) {
 566                 unsigned short oldattr = vc->vc_attr;
 567                 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
 568                                      vc->vc_cols - vc->vc_x - nr);
 569                 vc->vc_attr = vc->vc_video_erase_char >> 8;
 570                 while (nr--)
 571                         vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
 572                                      vc->vc_cols - 1 - nr);
 573                 vc->vc_attr = oldattr;
 574         }
 575 }
 576
 577 static int softcursor_original;
 578
 579 static void add_softcursor(struct vc_data *vc)
 580 {
 581         int i = scr_readw((u16 *) vc->vc_pos);
 582         u32 type = vc->vc_cursor_type;
 583
 584         if (! (type & 0x10)) return;
 585         if (softcursor_original != -1) return;
 586         softcursor_original = i;
 587         i |= ((type >> 8) & 0xff00 );
 588         i ^= ((type) & 0xff00 );
 589         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 590         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 591         scr_writew(i, (u16 *) vc->vc_pos);
 592         if (DO_UPDATE(vc))
 593                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 594 }
 595
 596 static void hide_softcursor(struct vc_data *vc)
 597 {
 598         if (softcursor_original != -1) {
 599                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 600                 if (DO_UPDATE(vc))
 601                         vc->vc_sw->con_putc(vc, softcursor_original,
 602                                         vc->vc_y, vc->vc_x);
 603                 softcursor_original = -1;
 604         }
 605 }
 606
 607 static void hide_cursor(struct vc_data *vc)
 608 {
 609         if (vc == sel_cons)
 610                 clear_selection();
 611         vc->vc_sw->con_cursor(vc, CM_ERASE);
 612         hide_softcursor(vc);
 613 }
 614
 615 static void set_cursor(struct vc_data *vc)
 616 {
 617         if (!IS_FG(vc) || console_blanked ||
 618             vc->vc_mode == KD_GRAPHICS)
 619                 return;
 620         if (vc->vc_deccm) {
 621                 if (vc == sel_cons)
 622                         clear_selection();
 623                 add_softcursor(vc);
 624                 if ((vc->vc_cursor_type & 0x0f) != 1)
 625                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 626         } else
 627                 hide_cursor(vc);
 628 }
 629
 630 static void set_origin(struct vc_data *vc)
 631 {
 632         WARN_CONSOLE_UNLOCKED();
 633
 634         if (!CON_IS_VISIBLE(vc) ||
 635             !vc->vc_sw->con_set_origin ||
 636             !vc->vc_sw->con_set_origin(vc))
 637                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 638         vc->vc_visible_origin = vc->vc_origin;
 639         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 640         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 641 }
 642
 643 static inline void save_screen(struct vc_data *vc)
 644 {
 645         WARN_CONSOLE_UNLOCKED();
 646
 647         if (vc->vc_sw->con_save_screen)
 648                 vc->vc_sw->con_save_screen(vc);
 649 }
 650
 651 /*
 652  *      Redrawing of screen
 653  */
 654
 655 static void clear_buffer_attributes(struct vc_data *vc)
 656 {
 657         unsigned short *p = (unsigned short *)vc->vc_origin;
 658         int count = vc->vc_screenbuf_size / 2;
 659         int mask = vc->vc_hi_font_mask | 0xff;
 660
 661         for (; count > 0; count--, p++) {
 662                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 663         }
 664 }
 665
 666 void redraw_screen(struct vc_data *vc, int is_switch)
 667 {
 668         int redraw = 0;
 669
 670         WARN_CONSOLE_UNLOCKED();
 671
 672         if (!vc) {
 673                 /* strange ... */
 674                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 675                 return;
 676         }
 677
 678         if (is_switch) {
 679                 struct vc_data *old_vc = vc_cons[fg_console].d;
 680                 if (old_vc == vc)
 681                         return;
 682                 if (!CON_IS_VISIBLE(vc))
 683                         redraw = 1;
 684                 *vc->vc_display_fg = vc;
 685                 fg_console = vc->vc_num;
 686                 hide_cursor(old_vc);
 687                 if (!CON_IS_VISIBLE(old_vc)) {
 688                         save_screen(old_vc);
 689                         set_origin(old_vc);
 690                 }
 691         } else {
 692                 hide_cursor(vc);
 693                 redraw = 1;
 694         }
 695
 696         if (redraw) {
 697                 int update;
 698                 int old_was_color = vc->vc_can_do_color;
 699
 700                 set_origin(vc);
 701                 update = vc->vc_sw->con_switch(vc);
 702                 set_palette(vc);
 703                 /*
 704                  * If console changed from mono<->color, the best we can do
 705                  * is to clear the buffer attributes. As it currently stands,
 706                  * rebuilding new attributes from the old buffer is not doable
 707                  * without overly complex code.
 708                  */
 709                 if (old_was_color != vc->vc_can_do_color) {
 710                         update_attr(vc);
 711                         clear_buffer_attributes(vc);
 712                 }
 713
 714                 /* Forcibly update if we're panicing */
 715                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 716                     vt_force_oops_output(vc))
 717                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 718         }
 719         set_cursor(vc);
 720         if (is_switch) {
 721                 set_leds();
 722                 compute_shiftstate();
 723                 notify_update(vc);
 724         }
 725 }
 726
 727 /*
 728  *      Allocation, freeing and resizing of VTs.
 729  */
 730
 731 int vc_cons_allocated(unsigned int i)
 732 {
 733         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 734 }
 735
 736 static void visual_init(struct vc_data *vc, int num, int init)
 737 {
 738         /* ++Geert: vc->vc_sw->con_init determines console size */
 739         if (vc->vc_sw)
 740                 module_put(vc->vc_sw->owner);
 741         vc->vc_sw = conswitchp;
 742 #ifndef VT_SINGLE_DRIVER
 743         if (con_driver_map[num])
 744                 vc->vc_sw = con_driver_map[num];
 745 #endif
 746         __module_get(vc->vc_sw->owner);
 747         vc->vc_num = num;
 748         vc->vc_display_fg = &master_display_fg;
 749         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 750         vc->vc_uni_pagedir = 0;
 751         vc->vc_hi_font_mask = 0;
 752         vc->vc_complement_mask = 0;
 753         vc->vc_can_do_color = 0;
 754         vc->vc_panic_force_write = false;
 755         vc->vc_sw->con_init(vc, init);
 756         if (!vc->vc_complement_mask)
 757                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 758         vc->vc_s_complement_mask = vc->vc_complement_mask;
 759         vc->vc_size_row = vc->vc_cols << 1;
 760         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 761 }
 762
 763 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 764 {
 765         WARN_CONSOLE_UNLOCKED();
 766
 767         if (currcons >= MAX_NR_CONSOLES)
 768                 return -ENXIO;
 769         if (!vc_cons[currcons].d) {
 770             struct vc_data *vc;
 771             struct vt_notifier_param param;
 772
 773             /* prevent users from taking too much memory */
 774             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 775               return -EPERM;
 776
 777             /* due to the granularity of kmalloc, we waste some memory here */
 778             /* the alloc is done in two steps, to optimize the common situation
 779                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 780             /* although the numbers above are not valid since long ago, the
 781                point is still up-to-date and the comment still has its value
 782                even if only as a historical artifact.  --mj, July 1998 */
 783             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 784             if (!vc)
 785                 return -ENOMEM;
 786             vc_cons[currcons].d = vc;
 787             tty_port_init(&vc->port);
 788             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 789             visual_init(vc, currcons, 1);
 790             if (!*vc->vc_uni_pagedir_loc)
 791                 con_set_default_unimap(vc);
 792             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 793             if (!vc->vc_screenbuf) {
 794                 kfree(vc);
 795                 vc_cons[currcons].d = NULL;
 796                 return -ENOMEM;
 797             }
 798
 799             /* If no drivers have overridden us and the user didn't pass a
 800                boot option, default to displaying the cursor */
 801             if (global_cursor_default == -1)
 802                     global_cursor_default = 1;
 803
 804             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 805             vcs_make_sysfs(currcons);
 806             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 807         }
 808         return 0;
 809 }
 810
 811 static inline int resize_screen(struct vc_data *vc, int width, int height,
 812                                 int user)
 813 {
 814         /* Resizes the resolution of the display adapater */
 815         int err = 0;
 816
 817         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 818                 err = vc->vc_sw->con_resize(vc, width, height, user);
 819
 820         return err;
 821 }
 822
 823 /*
 824  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 825  * [this is to be used together with some user program
 826  * like resize that changes the hardware videomode]
 827  */
 828 #define VC_RESIZE_MAXCOL (32767)
 829 #define VC_RESIZE_MAXROW (32767)
 830
 831 /**
 832  *      vc_do_resize    -       resizing method for the tty
 833  *      @tty: tty being resized
 834  *      @real_tty: real tty (different to tty if a pty/tty pair)
 835  *      @vc: virtual console private data
 836  *      @cols: columns
 837  *      @lines: lines
 838  *
 839  *      Resize a virtual console, clipping according to the actual constraints.
 840  *      If the caller passes a tty structure then update the termios winsize
 841  *      information and perform any necessary signal handling.
 842  *
 843  *      Caller must hold the console semaphore. Takes the termios mutex and
 844  *      ctrl_lock of the tty IFF a tty is passed.
 845  */
 846
 847 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 848                                 unsigned int cols, unsigned int lines)
 849 {
 850         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 851         unsigned long end;
 852         unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 853         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 854         unsigned int user;
 855         unsigned short *newscreen;
 856
 857         WARN_CONSOLE_UNLOCKED();
 858
 859         if (!vc)
 860                 return -ENXIO;
 861
 862         user = vc->vc_resize_user;
 863         vc->vc_resize_user = 0;
 864
 865         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 866                 return -EINVAL;
 867
 868         new_cols = (cols ? cols : vc->vc_cols);
 869         new_rows = (lines ? lines : vc->vc_rows);
 870         new_row_size = new_cols << 1;
 871         new_screen_size = new_row_size * new_rows;
 872
 873         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 874                 return 0;
 875
 876         newscreen = kmalloc(new_screen_size, GFP_USER);
 877         if (!newscreen)
 878                 return -ENOMEM;
 879
 880         old_rows = vc->vc_rows;
 881         old_cols = vc->vc_cols;
 882         old_row_size = vc->vc_size_row;
 883         old_screen_size = vc->vc_screenbuf_size;
 884
 885         err = resize_screen(vc, new_cols, new_rows, user);
 886         if (err) {
 887                 kfree(newscreen);
 888                 return err;
 889         }
 890
 891         vc->vc_rows = new_rows;
 892         vc->vc_cols = new_cols;
 893         vc->vc_size_row = new_row_size;
 894         vc->vc_screenbuf_size = new_screen_size;
 895
 896         rlth = min(old_row_size, new_row_size);
 897         rrem = new_row_size - rlth;
 898         old_origin = vc->vc_origin;
 899         new_origin = (long) newscreen;
 900         new_scr_end = new_origin + new_screen_size;
 901
 902         if (vc->vc_y > new_rows) {
 903                 if (old_rows - vc->vc_y < new_rows) {
 904                         /*
 905                          * Cursor near the bottom, copy contents from the
 906                          * bottom of buffer
 907                          */
 908                         old_origin += (old_rows - new_rows) * old_row_size;
 909                         end = vc->vc_scr_end;
 910                 } else {
 911                         /*
 912                          * Cursor is in no man's land, copy 1/2 screenful
 913                          * from the top and bottom of cursor position
 914                          */
 915                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 916                         end = old_origin + (old_row_size * new_rows);
 917                 }
 918         } else
 919                 /*
 920                  * Cursor near the top, copy contents from the top of buffer
 921                  */
 922                 end = (old_rows > new_rows) ? old_origin +
 923                         (old_row_size * new_rows) :
 924                         vc->vc_scr_end;
 925
 926         update_attr(vc);
 927
 928         while (old_origin < end) {
 929                 scr_memcpyw((unsigned short *) new_origin,
 930                             (unsigned short *) old_origin, rlth);
 931                 if (rrem)
 932                         scr_memsetw((void *)(new_origin + rlth),
 933                                     vc->vc_video_erase_char, rrem);
 934                 old_origin += old_row_size;
 935                 new_origin += new_row_size;
 936         }
 937         if (new_scr_end > new_origin)
 938                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 939                             new_scr_end - new_origin);
 940         kfree(vc->vc_screenbuf);
 941         vc->vc_screenbuf = newscreen;
 942         vc->vc_screenbuf_size = new_screen_size;
 943         set_origin(vc);
 944
 945         /* do part of a reset_terminal() */
 946         vc->vc_top = 0;
 947         vc->vc_bottom = vc->vc_rows;
 948         gotoxy(vc, vc->vc_x, vc->vc_y);
 949         save_cur(vc);
 950
 951         if (tty) {
 952                 /* Rewrite the requested winsize data with the actual
 953                    resulting sizes */
 954                 struct winsize ws;
 955                 memset(&ws, 0, sizeof(ws));
 956                 ws.ws_row = vc->vc_rows;
 957                 ws.ws_col = vc->vc_cols;
 958                 ws.ws_ypixel = vc->vc_scan_lines;
 959                 tty_do_resize(tty, &ws);
 960         }
 961
 962         if (CON_IS_VISIBLE(vc))
 963                 update_screen(vc);
 964         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 965         return err;
 966 }
 967
 968 /**
 969  *      vc_resize               -       resize a VT
 970  *      @vc: virtual console
 971  *      @cols: columns
 972  *      @rows: rows
 973  *
 974  *      Resize a virtual console as seen from the console end of things. We
 975  *      use the common vc_do_resize methods to update the structures. The
 976  *      caller must hold the console sem to protect console internals and
 977  *      vc->port.tty
 978  */
 979
 980 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 981 {
 982         return vc_do_resize(vc->port.tty, vc, cols, rows);
 983 }
 984
 985 /**
 986  *      vt_resize               -       resize a VT
 987  *      @tty: tty to resize
 988  *      @ws: winsize attributes
 989  *
 990  *      Resize a virtual terminal. This is called by the tty layer as we
 991  *      register our own handler for resizing. The mutual helper does all
 992  *      the actual work.
 993  *
 994  *      Takes the console sem and the called methods then take the tty
 995  *      termios_mutex and the tty ctrl_lock in that order.
 996  */
 997 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 998 {
 999         struct vc_data *vc = tty->driver_data;
1000         int ret;
1001
1002         acquire_console_sem();
1003         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1004         release_console_sem();
1005         return ret;
1006 }
1007
1008 void vc_deallocate(unsigned int currcons)
1009 {
1010         WARN_CONSOLE_UNLOCKED();
1011
1012         if (vc_cons_allocated(currcons)) {
1013                 struct vc_data *vc = vc_cons[currcons].d;
1014                 struct vt_notifier_param param = { .vc = vc };
1015
1016                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1017                 vcs_remove_sysfs(currcons);
1018                 vc->vc_sw->con_deinit(vc);
1019                 put_pid(vc->vt_pid);
1020                 module_put(vc->vc_sw->owner);
1021                 kfree(vc->vc_screenbuf);
1022                 if (currcons >= MIN_NR_CONSOLES)
1023                         kfree(vc);
1024                 vc_cons[currcons].d = NULL;
1025         }
1026 }
1027
1028 /*
1029  *      VT102 emulator
1030  */
1031
1032 #define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1033 #define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1034 #define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1035
1036 #define decarm          VC_REPEAT
1037 #define decckm          VC_CKMODE
1038 #define kbdapplic       VC_APPLIC
1039 #define lnm             VC_CRLF
1040
1041 /*
1042  * this is what the terminal answers to a ESC-Z or csi0c query.
1043  */
1044 #define VT100ID "\033[?1;2c"
1045 #define VT102ID "\033[?6c"
1046
1047 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1048                                        8,12,10,14, 9,13,11,15 };
1049
1050 /* the default colour table, for VGA+ colour systems */
1051 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1052     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1053 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1054     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1055 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1056     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1057
1058 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1059 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1060 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1061
1062 /*
1063  * gotoxy() must verify all boundaries, because the arguments
1064  * might also be negative. If the given position is out of
1065  * bounds, the cursor is placed at the nearest margin.
1066  */
1067 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1068 {
1069         int min_y, max_y;
1070
1071         if (new_x < 0)
1072                 vc->vc_x = 0;
1073         else {
1074                 if (new_x >= vc->vc_cols)
1075                         vc->vc_x = vc->vc_cols - 1;
1076                 else
1077                         vc->vc_x = new_x;
1078         }
1079
1080         if (vc->vc_decom) {
1081                 min_y = vc->vc_top;
1082                 max_y = vc->vc_bottom;
1083         } else {
1084                 min_y = 0;
1085                 max_y = vc->vc_rows;
1086         }
1087         if (new_y < min_y)
1088                 vc->vc_y = min_y;
1089         else if (new_y >= max_y)
1090                 vc->vc_y = max_y - 1;
1091         else
1092                 vc->vc_y = new_y;
1093         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1094         vc->vc_need_wrap = 0;
1095 }
1096
1097 /* for absolute user moves, when decom is set */
1098 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1099 {
1100         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1101 }
1102
1103 void scrollback(struct vc_data *vc, int lines)
1104 {
1105         if (!lines)
1106                 lines = vc->vc_rows / 2;
1107         scrolldelta(-lines);
1108 }
1109
1110 void scrollfront(struct vc_data *vc, int lines)
1111 {
1112         if (!lines)
1113                 lines = vc->vc_rows / 2;
1114         scrolldelta(lines);
1115 }
1116
1117 static void lf(struct vc_data *vc)
1118 {
1119         /* don't scroll if above bottom of scrolling region, or
1120          * if below scrolling region
1121          */
1122         if (vc->vc_y + 1 == vc->vc_bottom)
1123                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1124         else if (vc->vc_y < vc->vc_rows - 1) {
1125                 vc->vc_y++;
1126                 vc->vc_pos += vc->vc_size_row;
1127         }
1128         vc->vc_need_wrap = 0;
1129         notify_write(vc, '\n');
1130 }
1131
1132 static void ri(struct vc_data *vc)
1133 {
1134         /* don't scroll if below top of scrolling region, or
1135          * if above scrolling region
1136          */
1137         if (vc->vc_y == vc->vc_top)
1138                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1139         else if (vc->vc_y > 0) {
1140                 vc->vc_y--;
1141                 vc->vc_pos -= vc->vc_size_row;
1142         }
1143         vc->vc_need_wrap = 0;
1144 }
1145
1146 static inline void cr(struct vc_data *vc)
1147 {
1148         vc->vc_pos -= vc->vc_x << 1;
1149         vc->vc_need_wrap = vc->vc_x = 0;
1150         notify_write(vc, '\r');
1151 }
1152
1153 static inline void bs(struct vc_data *vc)
1154 {
1155         if (vc->vc_x) {
1156                 vc->vc_pos -= 2;
1157                 vc->vc_x--;
1158                 vc->vc_need_wrap = 0;
1159                 notify_write(vc, '\b');
1160         }
1161 }
1162
1163 static inline void del(struct vc_data *vc)
1164 {
1165         /* ignored */
1166 }
1167
1168 static void csi_J(struct vc_data *vc, int vpar)
1169 {
1170         unsigned int count;
1171         unsigned short * start;
1172
1173         switch (vpar) {
1174                 case 0: /* erase from cursor to end of display */
1175                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1176                         start = (unsigned short *)vc->vc_pos;
1177                         if (DO_UPDATE(vc)) {
1178                                 /* do in two stages */
1179                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1180                                               vc->vc_cols - vc->vc_x);
1181                                 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1182                                               vc->vc_rows - vc->vc_y - 1,
1183                                               vc->vc_cols);
1184                         }
1185                         break;
1186                 case 1: /* erase from start to cursor */
1187                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1188                         start = (unsigned short *)vc->vc_origin;
1189                         if (DO_UPDATE(vc)) {
1190                                 /* do in two stages */
1191                                 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1192                                               vc->vc_cols);
1193                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1194                                               vc->vc_x + 1);
1195                         }
1196                         break;
1197                 case 2: /* erase whole display */
1198                         count = vc->vc_cols * vc->vc_rows;
1199                         start = (unsigned short *)vc->vc_origin;
1200                         if (DO_UPDATE(vc))
1201                                 vc->vc_sw->con_clear(vc, 0, 0,
1202                                               vc->vc_rows,
1203                                               vc->vc_cols);
1204                         break;
1205                 default:
1206                         return;
1207         }
1208         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1209         vc->vc_need_wrap = 0;
1210 }
1211
1212 static void csi_K(struct vc_data *vc, int vpar)
1213 {
1214         unsigned int count;
1215         unsigned short * start;
1216
1217         switch (vpar) {
1218                 case 0: /* erase from cursor to end of line */
1219                         count = vc->vc_cols - vc->vc_x;
1220                         start = (unsigned short *)vc->vc_pos;
1221                         if (DO_UPDATE(vc))
1222                                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1223                                                      vc->vc_cols - vc->vc_x);
1224                         break;
1225                 case 1: /* erase from start of line to cursor */
1226                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1227                         count = vc->vc_x + 1;
1228                         if (DO_UPDATE(vc))
1229                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1230                                                      vc->vc_x + 1);
1231                         break;
1232                 case 2: /* erase whole line */
1233                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1234                         count = vc->vc_cols;
1235                         if (DO_UPDATE(vc))
1236                                 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1237                                               vc->vc_cols);
1238                         break;
1239                 default:
1240                         return;
1241         }
1242         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1243         vc->vc_need_wrap = 0;
1244 }
1245
1246 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1247 {                                         /* not vt100? */
1248         int count;
1249
1250         if (!vpar)
1251                 vpar++;
1252         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1253
1254         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1255         if (DO_UPDATE(vc))
1256                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1257         vc->vc_need_wrap = 0;
1258 }
1259
1260 static void default_attr(struct vc_data *vc)
1261 {
1262         vc->vc_intensity = 1;
1263         vc->vc_italic = 0;
1264         vc->vc_underline = 0;
1265         vc->vc_reverse = 0;
1266         vc->vc_blink = 0;
1267         vc->vc_color = vc->vc_def_color;
1268 }
1269
1270 /* console_sem is held */
1271 static void csi_m(struct vc_data *vc)
1272 {
1273         int i;
1274
1275         for (i = 0; i <= vc->vc_npar; i++)
1276                 switch (vc->vc_par[i]) {
1277                         case 0: /* all attributes off */
1278                                 default_attr(vc);
1279                                 break;
1280                         case 1:
1281                                 vc->vc_intensity = 2;
1282                                 break;
1283                         case 2:
1284                                 vc->vc_intensity = 0;
1285                                 break;
1286                         case 3:
1287                                 vc->vc_italic = 1;
1288                                 break;
1289                         case 4:
1290                                 vc->vc_underline = 1;
1291                                 break;
1292                         case 5:
1293                                 vc->vc_blink = 1;
1294                                 break;
1295                         case 7:
1296                                 vc->vc_reverse = 1;
1297                                 break;
1298                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1299                                   * Select primary font, don't display
1300                                   * control chars if defined, don't set
1301                                   * bit 8 on output.
1302                                   */
1303                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1304                                                 ? vc->vc_G0_charset
1305                                                 : vc->vc_G1_charset, vc);
1306                                 vc->vc_disp_ctrl = 0;
1307                                 vc->vc_toggle_meta = 0;
1308                                 break;
1309                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1310                                   * Select first alternate font, lets
1311                                   * chars < 32 be displayed as ROM chars.
1312                                   */
1313                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1314                                 vc->vc_disp_ctrl = 1;
1315                                 vc->vc_toggle_meta = 0;
1316                                 break;
1317                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1318                                   * Select second alternate font, toggle
1319                                   * high bit before displaying as ROM char.
1320                                   */
1321                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1322                                 vc->vc_disp_ctrl = 1;
1323                                 vc->vc_toggle_meta = 1;
1324                                 break;
1325                         case 21:
1326                         case 22:
1327                                 vc->vc_intensity = 1;
1328                                 break;
1329                         case 23:
1330                                 vc->vc_italic = 0;
1331                                 break;
1332                         case 24:
1333                                 vc->vc_underline = 0;
1334                                 break;
1335                         case 25:
1336                                 vc->vc_blink = 0;
1337                                 break;
1338                         case 27:
1339                                 vc->vc_reverse = 0;
1340                                 break;
1341                         case 38: /* ANSI X3.64-1979 (SCO-ish?)
1342                                   * Enables underscore, white foreground
1343                                   * with white underscore (Linux - use
1344                                   * default foreground).
1345                                   */
1346                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1347                                 vc->vc_underline = 1;
1348                                 break;
1349                         case 39: /* ANSI X3.64-1979 (SCO-ish?)
1350                                   * Disable underline option.
1351                                   * Reset colour to default? It did this
1352                                   * before...
1353                                   */
1354                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1355                                 vc->vc_underline = 0;
1356                                 break;
1357                         case 49:
1358                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1359                                 break;
1360                         default:
1361                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1362                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1363                                                 | (vc->vc_color & 0xf0);
1364                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1365                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1366                                                 | (vc->vc_color & 0x0f);
1367                                 break;
1368                 }
1369         update_attr(vc);
1370 }
1371
1372 static void respond_string(const char *p, struct tty_struct *tty)
1373 {
1374         while (*p) {
1375                 tty_insert_flip_char(tty, *p, 0);
1376                 p++;
1377         }
1378         con_schedule_flip(tty);
1379 }
1380
1381 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1382 {
1383         char buf[40];
1384
1385         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1386         respond_string(buf, tty);
1387 }
1388
1389 static inline void status_report(struct tty_struct *tty)
1390 {
1391         respond_string("\033[0n", tty); /* Terminal ok */
1392 }
1393
1394 static inline void respond_ID(struct tty_struct * tty)
1395 {
1396         respond_string(VT102ID, tty);
1397 }
1398
1399 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1400 {
1401         char buf[8];
1402
1403         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1404                 (char)('!' + mry));
1405         respond_string(buf, tty);
1406 }
1407
1408 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1409 int mouse_reporting(void)
1410 {
1411         return vc_cons[fg_console].d->vc_report_mouse;
1412 }
1413
1414 /* console_sem is held */
1415 static void set_mode(struct vc_data *vc, int on_off)
1416 {
1417         int i;
1418
1419         for (i = 0; i <= vc->vc_npar; i++)
1420                 if (vc->vc_ques) {
1421                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1422                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1423                                 if (on_off)
1424                                         set_kbd(vc, decckm);
1425                                 else
1426                                         clr_kbd(vc, decckm);
1427                                 break;
1428                         case 3: /* 80/132 mode switch unimplemented */
1429                                 vc->vc_deccolm = on_off;
1430 #if 0
1431                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1432                                 /* this alone does not suffice; some user mode
1433                                    utility has to change the hardware regs */
1434 #endif
1435                                 break;
1436                         case 5:                 /* Inverted screen on/off */
1437                                 if (vc->vc_decscnm != on_off) {
1438                                         vc->vc_decscnm = on_off;
1439                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1440                                         update_attr(vc);
1441                                 }
1442                                 break;
1443                         case 6:                 /* Origin relative/absolute */
1444                                 vc->vc_decom = on_off;
1445                                 gotoxay(vc, 0, 0);
1446                                 break;
1447                         case 7:                 /* Autowrap on/off */
1448                                 vc->vc_decawm = on_off;
1449                                 break;
1450                         case 8:                 /* Autorepeat on/off */
1451                                 if (on_off)
1452                                         set_kbd(vc, decarm);
1453                                 else
1454                                         clr_kbd(vc, decarm);
1455                                 break;
1456                         case 9:
1457                                 vc->vc_report_mouse = on_off ? 1 : 0;
1458                                 break;
1459                         case 25:                /* Cursor on/off */
1460                                 vc->vc_deccm = on_off;
1461                                 break;
1462                         case 1000:
1463                                 vc->vc_report_mouse = on_off ? 2 : 0;
1464                                 break;
1465                         }
1466                 } else {
1467                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1468                         case 3:                 /* Monitor (display ctrls) */
1469                                 vc->vc_disp_ctrl = on_off;
1470                                 break;
1471                         case 4:                 /* Insert Mode on/off */
1472                                 vc->vc_decim = on_off;
1473                                 break;
1474                         case 20:                /* Lf, Enter == CrLf/Lf */
1475                                 if (on_off)
1476                                         set_kbd(vc, lnm);
1477                                 else
1478                                         clr_kbd(vc, lnm);
1479                                 break;
1480                         }
1481                 }
1482 }
1483
1484 /* console_sem is held */
1485 static void setterm_command(struct vc_data *vc)
1486 {
1487         switch(vc->vc_par[0]) {
1488                 case 1: /* set color for underline mode */
1489                         if (vc->vc_can_do_color &&
1490                                         vc->vc_par[1] < 16) {
1491                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1492                                 if (vc->vc_underline)
1493                                         update_attr(vc);
1494                         }
1495                         break;
1496                 case 2: /* set color for half intensity mode */
1497                         if (vc->vc_can_do_color &&
1498                                         vc->vc_par[1] < 16) {
1499                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1500                                 if (vc->vc_intensity == 0)
1501                                         update_attr(vc);
1502                         }
1503                         break;
1504                 case 8: /* store colors as defaults */
1505                         vc->vc_def_color = vc->vc_attr;
1506                         if (vc->vc_hi_font_mask == 0x100)
1507                                 vc->vc_def_color >>= 1;
1508                         default_attr(vc);
1509                         update_attr(vc);
1510                         break;
1511                 case 9: /* set blanking interval */
1512                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1513                         poke_blanked_console();
1514                         break;
1515                 case 10: /* set bell frequency in Hz */
1516                         if (vc->vc_npar >= 1)
1517                                 vc->vc_bell_pitch = vc->vc_par[1];
1518                         else
1519                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1520                         break;
1521                 case 11: /* set bell duration in msec */
1522                         if (vc->vc_npar >= 1)
1523                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1524                                         vc->vc_par[1] * HZ / 1000 : 0;
1525                         else
1526                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1527                         break;
1528                 case 12: /* bring specified console to the front */
1529                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1530                                 set_console(vc->vc_par[1] - 1);
1531                         break;
1532                 case 13: /* unblank the screen */
1533                         poke_blanked_console();
1534                         break;
1535                 case 14: /* set vesa powerdown interval */
1536                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1537                         break;
1538                 case 15: /* activate the previous console */
1539                         set_console(last_console);
1540                         break;
1541         }
1542 }
1543
1544 /* console_sem is held */
1545 static void csi_at(struct vc_data *vc, unsigned int nr)
1546 {
1547         if (nr > vc->vc_cols - vc->vc_x)
1548                 nr = vc->vc_cols - vc->vc_x;
1549         else if (!nr)
1550                 nr = 1;
1551         insert_char(vc, nr);
1552 }
1553
1554 /* console_sem is held */
1555 static void csi_L(struct vc_data *vc, unsigned int nr)
1556 {
1557         if (nr > vc->vc_rows - vc->vc_y)
1558                 nr = vc->vc_rows - vc->vc_y;
1559         else if (!nr)
1560                 nr = 1;
1561         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1562         vc->vc_need_wrap = 0;
1563 }
1564
1565 /* console_sem is held */
1566 static void csi_P(struct vc_data *vc, unsigned int nr)
1567 {
1568         if (nr > vc->vc_cols - vc->vc_x)
1569                 nr = vc->vc_cols - vc->vc_x;
1570         else if (!nr)
1571                 nr = 1;
1572         delete_char(vc, nr);
1573 }
1574
1575 /* console_sem is held */
1576 static void csi_M(struct vc_data *vc, unsigned int nr)
1577 {
1578         if (nr > vc->vc_rows - vc->vc_y)
1579                 nr = vc->vc_rows - vc->vc_y;
1580         else if (!nr)
1581                 nr=1;
1582         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1583         vc->vc_need_wrap = 0;
1584 }
1585
1586 /* console_sem is held (except via vc_init->reset_terminal */
1587 static void save_cur(struct vc_data *vc)
1588 {
1589         vc->vc_saved_x          = vc->vc_x;
1590         vc->vc_saved_y          = vc->vc_y;
1591         vc->vc_s_intensity      = vc->vc_intensity;
1592         vc->vc_s_italic         = vc->vc_italic;
1593         vc->vc_s_underline      = vc->vc_underline;
1594         vc->vc_s_blink          = vc->vc_blink;
1595         vc->vc_s_reverse        = vc->vc_reverse;
1596         vc->vc_s_charset        = vc->vc_charset;
1597         vc->vc_s_color          = vc->vc_color;
1598         vc->vc_saved_G0         = vc->vc_G0_charset;
1599         vc->vc_saved_G1         = vc->vc_G1_charset;
1600 }
1601
1602 /* console_sem is held */
1603 static void restore_cur(struct vc_data *vc)
1604 {
1605         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1606         vc->vc_intensity        = vc->vc_s_intensity;
1607         vc->vc_italic           = vc->vc_s_italic;
1608         vc->vc_underline        = vc->vc_s_underline;
1609         vc->vc_blink            = vc->vc_s_blink;
1610         vc->vc_reverse          = vc->vc_s_reverse;
1611         vc->vc_charset          = vc->vc_s_charset;
1612         vc->vc_color            = vc->vc_s_color;
1613         vc->vc_G0_charset       = vc->vc_saved_G0;
1614         vc->vc_G1_charset       = vc->vc_saved_G1;
1615         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1616         update_attr(vc);
1617         vc->vc_need_wrap = 0;
1618 }
1619
1620 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1621         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1622         ESpalette };
1623
1624 /* console_sem is held (except via vc_init()) */
1625 static void reset_terminal(struct vc_data *vc, int do_clear)
1626 {
1627         vc->vc_top              = 0;
1628         vc->vc_bottom           = vc->vc_rows;
1629         vc->vc_state            = ESnormal;
1630         vc->vc_ques             = 0;
1631         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1632         vc->vc_G0_charset       = LAT1_MAP;
1633         vc->vc_G1_charset       = GRAF_MAP;
1634         vc->vc_charset          = 0;
1635         vc->vc_need_wrap        = 0;
1636         vc->vc_report_mouse     = 0;
1637         vc->vc_utf              = default_utf8;
1638         vc->vc_utf_count        = 0;
1639
1640         vc->vc_disp_ctrl        = 0;
1641         vc->vc_toggle_meta      = 0;
1642
1643         vc->vc_decscnm          = 0;
1644         vc->vc_decom            = 0;
1645         vc->vc_decawm           = 1;
1646         vc->vc_deccm            = global_cursor_default;
1647         vc->vc_decim            = 0;
1648
1649         set_kbd(vc, decarm);
1650         clr_kbd(vc, decckm);
1651         clr_kbd(vc, kbdapplic);
1652         clr_kbd(vc, lnm);
1653         kbd_table[vc->vc_num].lockstate = 0;
1654         kbd_table[vc->vc_num].slockstate = 0;
1655         kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1656         kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1657         /* do not do set_leds here because this causes an endless tasklet loop
1658            when the keyboard hasn't been initialized yet */
1659
1660         vc->vc_cursor_type = cur_default;
1661         vc->vc_complement_mask = vc->vc_s_complement_mask;
1662
1663         default_attr(vc);
1664         update_attr(vc);
1665
1666         vc->vc_tab_stop[0]      = 0x01010100;
1667         vc->vc_tab_stop[1]      =
1668         vc->vc_tab_stop[2]      =
1669         vc->vc_tab_stop[3]      =
1670         vc->vc_tab_stop[4]      =
1671         vc->vc_tab_stop[5]      =
1672         vc->vc_tab_stop[6]      =
1673         vc->vc_tab_stop[7]      = 0x01010101;
1674
1675         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1676         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1677
1678         gotoxy(vc, 0, 0);
1679         save_cur(vc);
1680         if (do_clear)
1681             csi_J(vc, 2);
1682 }
1683
1684 /* console_sem is held */
1685 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1686 {
1687         /*
1688          *  Control characters can be used in the _middle_
1689          *  of an escape sequence.
1690          */
1691         switch (c) {
1692         case 0:
1693                 return;
1694         case 7:
1695                 if (vc->vc_bell_duration)
1696                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1697                 return;
1698         case 8:
1699                 bs(vc);
1700                 return;
1701         case 9:
1702                 vc->vc_pos -= (vc->vc_x << 1);
1703                 while (vc->vc_x < vc->vc_cols - 1) {
1704                         vc->vc_x++;
1705                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1706                                 break;
1707                 }
1708                 vc->vc_pos += (vc->vc_x << 1);
1709                 notify_write(vc, '\t');
1710                 return;
1711         case 10: case 11: case 12:
1712                 lf(vc);
1713                 if (!is_kbd(vc, lnm))
1714                         return;
1715         case 13:
1716                 cr(vc);
1717                 return;
1718         case 14:
1719                 vc->vc_charset = 1;
1720                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1721                 vc->vc_disp_ctrl = 1;
1722                 return;
1723         case 15:
1724                 vc->vc_charset = 0;
1725                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1726                 vc->vc_disp_ctrl = 0;
1727                 return;
1728         case 24: case 26:
1729                 vc->vc_state = ESnormal;
1730                 return;
1731         case 27:
1732                 vc->vc_state = ESesc;
1733                 return;
1734         case 127:
1735                 del(vc);
1736                 return;
1737         case 128+27:
1738                 vc->vc_state = ESsquare;
1739                 return;
1740         }
1741         switch(vc->vc_state) {
1742         case ESesc:
1743                 vc->vc_state = ESnormal;
1744                 switch (c) {
1745                 case '[':
1746                         vc->vc_state = ESsquare;
1747                         return;
1748                 case ']':
1749                         vc->vc_state = ESnonstd;
1750                         return;
1751                 case '%':
1752                         vc->vc_state = ESpercent;
1753                         return;
1754                 case 'E':
1755                         cr(vc);
1756                         lf(vc);
1757                         return;
1758                 case 'M':
1759                         ri(vc);
1760                         return;
1761                 case 'D':
1762                         lf(vc);
1763                         return;
1764                 case 'H':
1765                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1766                         return;
1767                 case 'Z':
1768                         respond_ID(tty);
1769                         return;
1770                 case '7':
1771                         save_cur(vc);
1772                         return;
1773                 case '8':
1774                         restore_cur(vc);
1775                         return;
1776                 case '(':
1777                         vc->vc_state = ESsetG0;
1778                         return;
1779                 case ')':
1780                         vc->vc_state = ESsetG1;
1781                         return;
1782                 case '#':
1783                         vc->vc_state = EShash;
1784                         return;
1785                 case 'c':
1786                         reset_terminal(vc, 1);
1787                         return;
1788                 case '>':  /* Numeric keypad */
1789                         clr_kbd(vc, kbdapplic);
1790                         return;
1791                 case '=':  /* Appl. keypad */
1792                         set_kbd(vc, kbdapplic);
1793                         return;
1794                 }
1795                 return;
1796         case ESnonstd:
1797                 if (c=='P') {   /* palette escape sequence */
1798                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1799                                 vc->vc_par[vc->vc_npar] = 0;
1800                         vc->vc_npar = 0;
1801                         vc->vc_state = ESpalette;
1802                         return;
1803                 } else if (c=='R') {   /* reset palette */
1804                         reset_palette(vc);
1805                         vc->vc_state = ESnormal;
1806                 } else
1807                         vc->vc_state = ESnormal;
1808                 return;
1809         case ESpalette:
1810                 if (isxdigit(c)) {
1811                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1812                         if (vc->vc_npar == 7) {
1813                                 int i = vc->vc_par[0] * 3, j = 1;
1814                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1815                                 vc->vc_palette[i++] += vc->vc_par[j++];
1816                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1817                                 vc->vc_palette[i++] += vc->vc_par[j++];
1818                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1819                                 vc->vc_palette[i] += vc->vc_par[j];
1820                                 set_palette(vc);
1821                                 vc->vc_state = ESnormal;
1822                         }
1823                 } else
1824                         vc->vc_state = ESnormal;
1825                 return;
1826         case ESsquare:
1827                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1828                         vc->vc_par[vc->vc_npar] = 0;
1829                 vc->vc_npar = 0;
1830                 vc->vc_state = ESgetpars;
1831                 if (c == '[') { /* Function key */
1832                         vc->vc_state=ESfunckey;
1833                         return;
1834                 }
1835                 vc->vc_ques = (c == '?');
1836                 if (vc->vc_ques)
1837                         return;
1838         case ESgetpars:
1839                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1840                         vc->vc_npar++;
1841                         return;
1842                 } else if (c>='0' && c<='9') {
1843                         vc->vc_par[vc->vc_npar] *= 10;
1844                         vc->vc_par[vc->vc_npar] += c - '0';
1845                         return;
1846                 } else
1847                         vc->vc_state = ESgotpars;
1848         case ESgotpars:
1849                 vc->vc_state = ESnormal;
1850                 switch(c) {
1851                 case 'h':
1852                         set_mode(vc, 1);
1853                         return;
1854                 case 'l':
1855                         set_mode(vc, 0);
1856                         return;
1857                 case 'c':
1858                         if (vc->vc_ques) {
1859                                 if (vc->vc_par[0])
1860                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1861                                 else
1862                                         vc->vc_cursor_type = cur_default;
1863                                 return;
1864                         }
1865                         break;
1866                 case 'm':
1867                         if (vc->vc_ques) {
1868                                 clear_selection();
1869                                 if (vc->vc_par[0])
1870                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1871                                 else
1872                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1873                                 return;
1874                         }
1875                         break;
1876                 case 'n':
1877                         if (!vc->vc_ques) {
1878                                 if (vc->vc_par[0] == 5)
1879                                         status_report(tty);
1880                                 else if (vc->vc_par[0] == 6)
1881                                         cursor_report(vc, tty);
1882                         }
1883                         return;
1884                 }
1885                 if (vc->vc_ques) {
1886                         vc->vc_ques = 0;
1887                         return;
1888                 }
1889                 switch(c) {
1890                 case 'G': case '`':
1891                         if (vc->vc_par[0])
1892                                 vc->vc_par[0]--;
1893                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1894                         return;
1895                 case 'A':
1896                         if (!vc->vc_par[0])
1897                                 vc->vc_par[0]++;
1898                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1899                         return;
1900                 case 'B': case 'e':
1901                         if (!vc->vc_par[0])
1902                                 vc->vc_par[0]++;
1903                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1904                         return;
1905                 case 'C': case 'a':
1906                         if (!vc->vc_par[0])
1907                                 vc->vc_par[0]++;
1908                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1909                         return;
1910                 case 'D':
1911                         if (!vc->vc_par[0])
1912                                 vc->vc_par[0]++;
1913                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1914                         return;
1915                 case 'E':
1916                         if (!vc->vc_par[0])
1917                                 vc->vc_par[0]++;
1918                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1919                         return;
1920                 case 'F':
1921                         if (!vc->vc_par[0])
1922                                 vc->vc_par[0]++;
1923                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1924                         return;
1925                 case 'd':
1926                         if (vc->vc_par[0])
1927                                 vc->vc_par[0]--;
1928                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1929                         return;
1930                 case 'H': case 'f':
1931                         if (vc->vc_par[0])
1932                                 vc->vc_par[0]--;
1933                         if (vc->vc_par[1])
1934                                 vc->vc_par[1]--;
1935                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1936                         return;
1937                 case 'J':
1938                         csi_J(vc, vc->vc_par[0]);
1939                         return;
1940                 case 'K':
1941                         csi_K(vc, vc->vc_par[0]);
1942                         return;
1943                 case 'L':
1944                         csi_L(vc, vc->vc_par[0]);
1945                         return;
1946                 case 'M':
1947                         csi_M(vc, vc->vc_par[0]);
1948                         return;
1949                 case 'P':
1950                         csi_P(vc, vc->vc_par[0]);
1951                         return;
1952                 case 'c':
1953                         if (!vc->vc_par[0])
1954                                 respond_ID(tty);
1955                         return;
1956                 case 'g':
1957                         if (!vc->vc_par[0])
1958                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1959                         else if (vc->vc_par[0] == 3) {
1960                                 vc->vc_tab_stop[0] =
1961                                         vc->vc_tab_stop[1] =
1962                                         vc->vc_tab_stop[2] =
1963                                         vc->vc_tab_stop[3] =
1964                                         vc->vc_tab_stop[4] =
1965                                         vc->vc_tab_stop[5] =
1966                                         vc->vc_tab_stop[6] =
1967                                         vc->vc_tab_stop[7] = 0;
1968                         }
1969                         return;
1970                 case 'm':
1971                         csi_m(vc);
1972                         return;
1973                 case 'q': /* DECLL - but only 3 leds */
1974                         /* map 0,1,2,3 to 0,1,2,4 */
1975                         if (vc->vc_par[0] < 4)
1976                                 setledstate(kbd_table + vc->vc_num,
1977                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1978                         return;
1979                 case 'r':
1980                         if (!vc->vc_par[0])
1981                                 vc->vc_par[0]++;
1982                         if (!vc->vc_par[1])
1983                                 vc->vc_par[1] = vc->vc_rows;
1984                         /* Minimum allowed region is 2 lines */
1985                         if (vc->vc_par[0] < vc->vc_par[1] &&
1986                             vc->vc_par[1] <= vc->vc_rows) {
1987                                 vc->vc_top = vc->vc_par[0] - 1;
1988                                 vc->vc_bottom = vc->vc_par[1];
1989                                 gotoxay(vc, 0, 0);
1990                         }
1991                         return;
1992                 case 's':
1993                         save_cur(vc);
1994                         return;
1995                 case 'u':
1996                         restore_cur(vc);
1997                         return;
1998                 case 'X':
1999                         csi_X(vc, vc->vc_par[0]);
2000                         return;
2001                 case '@':
2002                         csi_at(vc, vc->vc_par[0]);
2003                         return;
2004                 case ']': /* setterm functions */
2005                         setterm_command(vc);
2006                         return;
2007                 }
2008                 return;
2009         case ESpercent:
2010                 vc->vc_state = ESnormal;
2011                 switch (c) {
2012                 case '@':  /* defined in ISO 2022 */
2013                         vc->vc_utf = 0;
2014                         return;
2015                 case 'G':  /* prelim official escape code */
2016                 case '8':  /* retained for compatibility */
2017                         vc->vc_utf = 1;
2018                         return;
2019                 }
2020                 return;
2021         case ESfunckey:
2022                 vc->vc_state = ESnormal;
2023                 return;
2024         case EShash:
2025                 vc->vc_state = ESnormal;
2026                 if (c == '8') {
2027                         /* DEC screen alignment test. kludge :-) */
2028                         vc->vc_video_erase_char =
2029                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2030                         csi_J(vc, 2);
2031                         vc->vc_video_erase_char =
2032                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2033                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2034                 }
2035                 return;
2036         case ESsetG0:
2037                 if (c == '0')
2038                         vc->vc_G0_charset = GRAF_MAP;
2039                 else if (c == 'B')
2040                         vc->vc_G0_charset = LAT1_MAP;
2041                 else if (c == 'U')
2042                         vc->vc_G0_charset = IBMPC_MAP;
2043                 else if (c == 'K')
2044                         vc->vc_G0_charset = USER_MAP;
2045                 if (vc->vc_charset == 0)
2046                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2047                 vc->vc_state = ESnormal;
2048                 return;
2049         case ESsetG1:
2050                 if (c == '0')
2051                         vc->vc_G1_charset = GRAF_MAP;
2052                 else if (c == 'B')
2053                         vc->vc_G1_charset = LAT1_MAP;
2054                 else if (c == 'U')
2055                         vc->vc_G1_charset = IBMPC_MAP;
2056                 else if (c == 'K')
2057                         vc->vc_G1_charset = USER_MAP;
2058                 if (vc->vc_charset == 1)
2059                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2060                 vc->vc_state = ESnormal;
2061                 return;
2062         default:
2063                 vc->vc_state = ESnormal;
2064         }
2065 }
2066
2067 /* This is a temporary buffer used to prepare a tty console write
2068  * so that we can easily avoid touching user space while holding the
2069  * console spinlock.  It is allocated in con_init and is shared by
2070  * this code and the vc_screen read/write tty calls.
2071  *
2072  * We have to allocate this statically in the kernel data section
2073  * since console_init (and thus con_init) are called before any
2074  * kernel memory allocation is available.
2075  */
2076 char con_buf[CON_BUF_SIZE];
2077 DEFINE_MUTEX(con_buf_mtx);
2078
2079 /* is_double_width() is based on the wcwidth() implementation by
2080  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2081  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2082  */
2083 struct interval {
2084         uint32_t first;
2085         uint32_t last;
2086 };
2087
2088 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2089 {
2090         int min = 0;
2091         int mid;
2092
2093         if (ucs < table[0].first || ucs > table[max].last)
2094                 return 0;
2095         while (max >= min) {
2096                 mid = (min + max) / 2;
2097                 if (ucs > table[mid].last)
2098                         min = mid + 1;
2099                 else if (ucs < table[mid].first)
2100                         max = mid - 1;
2101                 else
2102                         return 1;
2103         }
2104         return 0;
2105 }
2106
2107 static int is_double_width(uint32_t ucs)
2108 {
2109         static const struct interval double_width[] = {
2110                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2111                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2112                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2113                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2114         };
2115         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2116 }
2117
2118 /* acquires console_sem */
2119 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2120 {
2121 #ifdef VT_BUF_VRAM_ONLY
2122 #define FLUSH do { } while(0);
2123 #else
2124 #define FLUSH if (draw_x >= 0) { \
2125         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2126         draw_x = -1; \
2127         }
2128 #endif
2129
2130         int c, tc, ok, n = 0, draw_x = -1;
2131         unsigned int currcons;
2132         unsigned long draw_from = 0, draw_to = 0;
2133         struct vc_data *vc;
2134         unsigned char vc_attr;
2135         struct vt_notifier_param param;
2136         uint8_t rescan;
2137         uint8_t inverse;
2138         uint8_t width;
2139         u16 himask, charmask;
2140
2141         if (in_interrupt())
2142                 return count;
2143
2144         might_sleep();
2145
2146         acquire_console_sem();
2147         vc = tty->driver_data;
2148         if (vc == NULL) {
2149                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2150                 release_console_sem();
2151                 return 0;
2152         }
2153
2154         currcons = vc->vc_num;
2155         if (!vc_cons_allocated(currcons)) {
2156             /* could this happen? */
2157                 printk_once("con_write: tty %d not allocated\n", currcons+1);
2158             release_console_sem();
2159             return 0;
2160         }
2161
2162         himask = vc->vc_hi_font_mask;
2163         charmask = himask ? 0x1ff : 0xff;
2164
2165         /* undraw cursor first */
2166         if (IS_FG(vc))
2167                 hide_cursor(vc);
2168
2169         param.vc = vc;
2170
2171         while (!tty->stopped && count) {
2172                 int orig = *buf;
2173                 c = orig;
2174                 buf++;
2175                 n++;
2176                 count--;
2177                 rescan = 0;
2178                 inverse = 0;
2179                 width = 1;
2180
2181                 /* Do no translation at all in control states */
2182                 if (vc->vc_state != ESnormal) {
2183                         tc = c;
2184                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2185                     /* Combine UTF-8 into Unicode in vc_utf_char.
2186                      * vc_utf_count is the number of continuation bytes still
2187                      * expected to arrive.
2188                      * vc_npar is the number of continuation bytes arrived so
2189                      * far
2190                      */
2191 rescan_last_byte:
2192                     if ((c & 0xc0) == 0x80) {
2193                         /* Continuation byte received */
2194                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2195                         if (vc->vc_utf_count) {
2196                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2197                             vc->vc_npar++;
2198                             if (--vc->vc_utf_count) {
2199                                 /* Still need some bytes */
2200                                 continue;
2201                             }
2202                             /* Got a whole character */
2203                             c = vc->vc_utf_char;
2204                             /* Reject overlong sequences */
2205                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2206                                         c > utf8_length_changes[vc->vc_npar])
2207                                 c = 0xfffd;
2208                         } else {
2209                             /* Unexpected continuation byte */
2210                             vc->vc_utf_count = 0;
2211                             c = 0xfffd;
2212                         }
2213                     } else {
2214                         /* Single ASCII byte or first byte of a sequence received */
2215                         if (vc->vc_utf_count) {
2216                             /* Continuation byte expected */
2217                             rescan = 1;
2218                             vc->vc_utf_count = 0;
2219                             c = 0xfffd;
2220                         } else if (c > 0x7f) {
2221                             /* First byte of a multibyte sequence received */
2222                             vc->vc_npar = 0;
2223                             if ((c & 0xe0) == 0xc0) {
2224                                 vc->vc_utf_count = 1;
2225                                 vc->vc_utf_char = (c & 0x1f);
2226                             } else if ((c & 0xf0) == 0xe0) {
2227                                 vc->vc_utf_count = 2;
2228                                 vc->vc_utf_char = (c & 0x0f);
2229                             } else if ((c & 0xf8) == 0xf0) {
2230                                 vc->vc_utf_count = 3;
2231                                 vc->vc_utf_char = (c & 0x07);
2232                             } else if ((c & 0xfc) == 0xf8) {
2233                                 vc->vc_utf_count = 4;
2234                                 vc->vc_utf_char = (c & 0x03);
2235                             } else if ((c & 0xfe) == 0xfc) {
2236                                 vc->vc_utf_count = 5;
2237                                 vc->vc_utf_char = (c & 0x01);
2238                             } else {
2239                                 /* 254 and 255 are invalid */
2240                                 c = 0xfffd;
2241                             }
2242                             if (vc->vc_utf_count) {
2243                                 /* Still need some bytes */
2244                                 continue;
2245                             }
2246                         }
2247                         /* Nothing to do if an ASCII byte was received */
2248                     }
2249                     /* End of UTF-8 decoding. */
2250                     /* c is the received character, or U+FFFD for invalid sequences. */
2251                     /* Replace invalid Unicode code points with U+FFFD too */
2252                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2253                         c = 0xfffd;
2254                     tc = c;
2255                 } else {        /* no utf or alternate charset mode */
2256                     tc = vc_translate(vc, c);
2257                 }
2258
2259                 param.c = tc;
2260                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2261                                         &param) == NOTIFY_STOP)
2262                         continue;
2263
2264                 /* If the original code was a control character we
2265                  * only allow a glyph to be displayed if the code is
2266                  * not normally used (such as for cursor movement) or
2267                  * if the disp_ctrl mode has been explicitly enabled.
2268                  * Certain characters (as given by the CTRL_ALWAYS
2269                  * bitmap) are always displayed as control characters,
2270                  * as the console would be pretty useless without
2271                  * them; to display an arbitrary font position use the
2272                  * direct-to-font zone in UTF-8 mode.
2273                  */
2274                 ok = tc && (c >= 32 ||
2275                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2276                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2277                         && (c != 127 || vc->vc_disp_ctrl)
2278                         && (c != 128+27);
2279
2280                 if (vc->vc_state == ESnormal && ok) {
2281                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2282                                 if (is_double_width(c))
2283                                         width = 2;
2284                         }
2285                         /* Now try to find out how to display it */
2286                         tc = conv_uni_to_pc(vc, tc);
2287                         if (tc & ~charmask) {
2288                                 if (tc == -1 || tc == -2) {
2289                                     continue; /* nothing to display */
2290                                 }
2291                                 /* Glyph not found */
2292                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2293                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2294                                        This would make absolutely no sense with Unicode in mind,
2295                                        but do this for ASCII characters since a font may lack
2296                                        Unicode mapping info and we don't want to end up with
2297                                        having question marks only. */
2298                                     tc = c;
2299                                 } else {
2300                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2301                                     tc = conv_uni_to_pc(vc, 0xfffd);
2302                                     if (tc < 0) {
2303                                         inverse = 1;
2304                                         tc = conv_uni_to_pc(vc, '?');
2305                                         if (tc < 0) tc = '?';
2306                                     }
2307                                 }
2308                         }
2309
2310                         if (!inverse) {
2311                                 vc_attr = vc->vc_attr;
2312                         } else {
2313                                 /* invert vc_attr */
2314                                 if (!vc->vc_can_do_color) {
2315                                         vc_attr = (vc->vc_attr) ^ 0x08;
2316                                 } else if (vc->vc_hi_font_mask == 0x100) {
2317                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2318                                 } else {
2319                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2320                                 }
2321                                 FLUSH
2322                         }
2323
2324                         while (1) {
2325                                 if (vc->vc_need_wrap || vc->vc_decim)
2326                                         FLUSH
2327                                 if (vc->vc_need_wrap) {
2328                                         cr(vc);
2329                                         lf(vc);
2330                                 }
2331                                 if (vc->vc_decim)
2332                                         insert_char(vc, 1);
2333                                 scr_writew(himask ?
2334                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2335                                              (vc_attr << 8) + tc,
2336                                            (u16 *) vc->vc_pos);
2337                                 if (DO_UPDATE(vc) && draw_x < 0) {
2338                                         draw_x = vc->vc_x;
2339                                         draw_from = vc->vc_pos;
2340                                 }
2341                                 if (vc->vc_x == vc->vc_cols - 1) {
2342                                         vc->vc_need_wrap = vc->vc_decawm;
2343                                         draw_to = vc->vc_pos + 2;
2344                                 } else {
2345                                         vc->vc_x++;
2346                                         draw_to = (vc->vc_pos += 2);
2347                                 }
2348
2349                                 if (!--width) break;
2350
2351                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2352                                 if (tc < 0) tc = ' ';
2353                         }
2354                         notify_write(vc, c);
2355
2356                         if (inverse) {
2357                                 FLUSH
2358                         }
2359
2360                         if (rescan) {
2361                                 rescan = 0;
2362                                 inverse = 0;
2363                                 width = 1;
2364                                 c = orig;
2365                                 goto rescan_last_byte;
2366                         }
2367                         continue;
2368                 }
2369                 FLUSH
2370                 do_con_trol(tty, vc, orig);
2371         }
2372         FLUSH
2373         console_conditional_schedule();
2374         release_console_sem();
2375         notify_update(vc);
2376         return n;
2377 #undef FLUSH
2378 }
2379
2380 /*
2381  * This is the console switching callback.
2382  *
2383  * Doing console switching in a process context allows
2384  * us to do the switches asynchronously (needed when we want
2385  * to switch due to a keyboard interrupt).  Synchronization
2386  * with other console code and prevention of re-entrancy is
2387  * ensured with console_sem.
2388  */
2389 static void console_callback(struct work_struct *ignored)
2390 {
2391         acquire_console_sem();
2392
2393         if (want_console >= 0) {
2394                 if (want_console != fg_console &&
2395                     vc_cons_allocated(want_console)) {
2396                         hide_cursor(vc_cons[fg_console].d);
2397                         change_console(vc_cons[want_console].d);
2398                         /* we only changed when the console had already
2399                            been allocated - a new console is not created
2400                            in an interrupt routine */
2401                 }
2402                 want_console = -1;
2403         }
2404         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2405                 do_poke_blanked_console = 0;
2406                 poke_blanked_console();
2407         }
2408         if (scrollback_delta) {
2409                 struct vc_data *vc = vc_cons[fg_console].d;
2410                 clear_selection();
2411                 if (vc->vc_mode == KD_TEXT)
2412                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2413                 scrollback_delta = 0;
2414         }
2415         if (blank_timer_expired) {
2416                 do_blank_screen(0);
2417                 blank_timer_expired = 0;
2418         }
2419         notify_update(vc_cons[fg_console].d);
2420
2421         release_console_sem();
2422 }
2423
2424 int set_console(int nr)
2425 {
2426         struct vc_data *vc = vc_cons[fg_console].d;
2427
2428         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2429                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2430
2431                 /*
2432                  * Console switch will fail in console_callback() or
2433                  * change_console() so there is no point scheduling
2434                  * the callback
2435                  *
2436                  * Existing set_console() users don't check the return
2437                  * value so this shouldn't break anything
2438                  */
2439                 return -EINVAL;
2440         }
2441
2442         want_console = nr;
2443         schedule_console_callback();
2444
2445         return 0;
2446 }
2447
2448 struct tty_driver *console_driver;
2449
2450 #ifdef CONFIG_VT_CONSOLE
2451
2452 /**
2453  * vt_kmsg_redirect() - Sets/gets the kernel message console
2454  * @new:        The new virtual terminal number or -1 if the console should stay
2455  *              unchanged
2456  *
2457  * By default, the kernel messages are always printed on the current virtual
2458  * console. However, the user may modify that default with the
2459  * TIOCL_SETKMSGREDIRECT ioctl call.
2460  *
2461  * This function sets the kernel message console to be @new. It returns the old
2462  * virtual console number. The virtual terminal number 0 (both as parameter and
2463  * return value) means no redirection (i.e. always printed on the currently
2464  * active console).
2465  *
2466  * The parameter -1 means that only the current console is returned, but the
2467  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2468  * case to make the code more understandable.
2469  *
2470  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2471  * the parameter and always returns 0.
2472  */
2473 int vt_kmsg_redirect(int new)
2474 {
2475         static int kmsg_con;
2476
2477         if (new != -1)
2478                 return xchg(&kmsg_con, new);
2479         else
2480                 return kmsg_con;
2481 }
2482
2483 /*
2484  *      Console on virtual terminal
2485  *
2486  * The console must be locked when we get here.
2487  */
2488
2489 static void vt_console_print(struct console *co, const char *b, unsigned count)
2490 {
2491         struct vc_data *vc = vc_cons[fg_console].d;
2492         unsigned char c;
2493         static DEFINE_SPINLOCK(printing_lock);
2494         const ushort *start;
2495         ushort cnt = 0;
2496         ushort myx;
2497         int kmsg_console;
2498
2499         /* console busy or not yet initialized */
2500         if (!printable)
2501                 return;
2502         if (!spin_trylock(&printing_lock))
2503                 return;
2504
2505         kmsg_console = vt_get_kmsg_redirect();
2506         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2507                 vc = vc_cons[kmsg_console - 1].d;
2508
2509         /* read `x' only after setting currcons properly (otherwise
2510            the `x' macro will read the x of the foreground console). */
2511         myx = vc->vc_x;
2512
2513         if (!vc_cons_allocated(fg_console)) {
2514                 /* impossible */
2515                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2516                 goto quit;
2517         }
2518
2519         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2520                 goto quit;
2521
2522         /* undraw cursor first */
2523         if (IS_FG(vc))
2524                 hide_cursor(vc);
2525
2526         start = (ushort *)vc->vc_pos;
2527
2528         /* Contrived structure to try to emulate original need_wrap behaviour
2529          * Problems caused when we have need_wrap set on '\n' character */
2530         while (count--) {
2531                 c = *b++;
2532                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2533                         if (cnt > 0) {
2534                                 if (CON_IS_VISIBLE(vc))
2535                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2536                                 vc->vc_x += cnt;
2537                                 if (vc->vc_need_wrap)
2538                                         vc->vc_x--;
2539                                 cnt = 0;
2540                         }
2541                         if (c == 8) {           /* backspace */
2542                                 bs(vc);
2543                                 start = (ushort *)vc->vc_pos;
2544                                 myx = vc->vc_x;
2545                                 continue;
2546                         }
2547                         if (c != 13)
2548                                 lf(vc);
2549                         cr(vc);
2550                         start = (ushort *)vc->vc_pos;
2551                         myx = vc->vc_x;
2552                         if (c == 10 || c == 13)
2553                                 continue;
2554                 }
2555                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2556                 notify_write(vc, c);
2557                 cnt++;
2558                 if (myx == vc->vc_cols - 1) {
2559                         vc->vc_need_wrap = 1;
2560                         continue;
2561                 }
2562                 vc->vc_pos += 2;
2563                 myx++;
2564         }
2565         if (cnt > 0) {
2566                 if (CON_IS_VISIBLE(vc))
2567                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2568                 vc->vc_x += cnt;
2569                 if (vc->vc_x == vc->vc_cols) {
2570                         vc->vc_x--;
2571                         vc->vc_need_wrap = 1;
2572                 }
2573         }
2574         set_cursor(vc);
2575         notify_update(vc);
2576
2577 quit:
2578         spin_unlock(&printing_lock);
2579 }
2580
2581 static struct tty_driver *vt_console_device(struct console *c, int *index)
2582 {
2583         *index = c->index ? c->index-1 : fg_console;
2584         return console_driver;
2585 }
2586
2587 static struct console vt_console_driver = {
2588         .name           = "tty",
2589         .write          = vt_console_print,
2590         .device         = vt_console_device,
2591         .unblank        = unblank_screen,
2592         .flags          = CON_PRINTBUFFER,
2593         .index          = -1,
2594 };
2595 #endif
2596
2597 /*
2598  *      Handling of Linux-specific VC ioctls
2599  */
2600
2601 /*
2602  * Generally a bit racy with respect to console_sem().
2603  *
2604  * There are some functions which don't need it.
2605  *
2606  * There are some functions which can sleep for arbitrary periods
2607  * (paste_selection) but we don't need the lock there anyway.
2608  *
2609  * set_selection has locking, and definitely needs it
2610  */
2611
2612 int tioclinux(struct tty_struct *tty, unsigned long arg)
2613 {
2614         char type, data;
2615         char __user *p = (char __user *)arg;
2616         int lines;
2617         int ret;
2618
2619         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2620                 return -EPERM;
2621         if (get_user(type, p))
2622                 return -EFAULT;
2623         ret = 0;
2624
2625         switch (type)
2626         {
2627                 case TIOCL_SETSEL:
2628                         acquire_console_sem();
2629                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2630                         release_console_sem();
2631                         break;
2632                 case TIOCL_PASTESEL:
2633                         ret = paste_selection(tty);
2634                         break;
2635                 case TIOCL_UNBLANKSCREEN:
2636                         acquire_console_sem();
2637                         unblank_screen();
2638                         release_console_sem();
2639                         break;
2640                 case TIOCL_SELLOADLUT:
2641                         ret = sel_loadlut(p);
2642                         break;
2643                 case TIOCL_GETSHIFTSTATE:
2644
2645         /*
2646          * Make it possible to react to Shift+Mousebutton.
2647          * Note that 'shift_state' is an undocumented
2648          * kernel-internal variable; programs not closely
2649          * related to the kernel should not use this.
2650          */
2651                         data = shift_state;
2652                         ret = __put_user(data, p);
2653                         break;
2654                 case TIOCL_GETMOUSEREPORTING:
2655                         data = mouse_reporting();
2656                         ret = __put_user(data, p);
2657                         break;
2658                 case TIOCL_SETVESABLANK:
2659                         ret = set_vesa_blanking(p);
2660                         break;
2661                 case TIOCL_GETKMSGREDIRECT:
2662                         data = vt_get_kmsg_redirect();
2663                         ret = __put_user(data, p);
2664                         break;
2665                 case TIOCL_SETKMSGREDIRECT:
2666                         if (!capable(CAP_SYS_ADMIN)) {
2667                                 ret = -EPERM;
2668                         } else {
2669                                 if (get_user(data, p+1))
2670                                         ret = -EFAULT;
2671                                 else
2672                                         vt_kmsg_redirect(data);
2673                         }
2674                         break;
2675                 case TIOCL_GETFGCONSOLE:
2676                         ret = fg_console;
2677                         break;
2678                 case TIOCL_SCROLLCONSOLE:
2679                         if (get_user(lines, (s32 __user *)(p+4))) {
2680                                 ret = -EFAULT;
2681                         } else {
2682                                 scrollfront(vc_cons[fg_console].d, lines);
2683                                 ret = 0;
2684                         }
2685                         break;
2686                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2687                         acquire_console_sem();
2688                         ignore_poke = 1;
2689                         do_blank_screen(0);
2690                         release_console_sem();
2691                         break;
2692                 case TIOCL_BLANKEDSCREEN:
2693                         ret = console_blanked;
2694                         break;
2695                 default:
2696                         ret = -EINVAL;
2697                         break;
2698         }
2699         return ret;
2700 }
2701
2702 /*
2703  * /dev/ttyN handling
2704  */
2705
2706 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2707 {
2708         int     retval;
2709
2710         retval = do_con_write(tty, buf, count);
2711         con_flush_chars(tty);
2712
2713         return retval;
2714 }
2715
2716 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2717 {
2718         if (in_interrupt())
2719                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2720         return do_con_write(tty, &ch, 1);
2721 }
2722
2723 static int con_write_room(struct tty_struct *tty)
2724 {
2725         if (tty->stopped)
2726                 return 0;
2727         return 32768;           /* No limit, really; we're not buffering */
2728 }
2729
2730 static int con_chars_in_buffer(struct tty_struct *tty)
2731 {
2732         return 0;               /* we're not buffering */
2733 }
2734
2735 /*
2736  * con_throttle and con_unthrottle are only used for
2737  * paste_selection(), which has to stuff in a large number of
2738  * characters...
2739  */
2740 static void con_throttle(struct tty_struct *tty)
2741 {
2742 }
2743
2744 static void con_unthrottle(struct tty_struct *tty)
2745 {
2746         struct vc_data *vc = tty->driver_data;
2747
2748         wake_up_interruptible(&vc->paste_wait);
2749 }
2750
2751 /*
2752  * Turn the Scroll-Lock LED on when the tty is stopped
2753  */
2754 static void con_stop(struct tty_struct *tty)
2755 {
2756         int console_num;
2757         if (!tty)
2758                 return;
2759         console_num = tty->index;
2760         if (!vc_cons_allocated(console_num))
2761                 return;
2762         set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2763         set_leds();
2764 }
2765
2766 /*
2767  * Turn the Scroll-Lock LED off when the console is started
2768  */
2769 static void con_start(struct tty_struct *tty)
2770 {
2771         int console_num;
2772         if (!tty)
2773                 return;
2774         console_num = tty->index;
2775         if (!vc_cons_allocated(console_num))
2776                 return;
2777         clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2778         set_leds();
2779 }
2780
2781 static void con_flush_chars(struct tty_struct *tty)
2782 {
2783         struct vc_data *vc;
2784
2785         if (in_interrupt())     /* from flush_to_ldisc */
2786                 return;
2787
2788         /* if we race with con_close(), vt may be null */
2789         acquire_console_sem();
2790         vc = tty->driver_data;
2791         if (vc)
2792                 set_cursor(vc);
2793         release_console_sem();
2794 }
2795
2796 /*
2797  * Allocate the console screen memory.
2798  */
2799 static int con_open(struct tty_struct *tty, struct file *filp)
2800 {
2801         unsigned int currcons = tty->index;
2802         int ret = 0;
2803
2804         acquire_console_sem();
2805         if (tty->driver_data == NULL) {
2806                 ret = vc_allocate(currcons);
2807                 if (ret == 0) {
2808                         struct vc_data *vc = vc_cons[currcons].d;
2809
2810                         /* Still being freed */
2811                         if (vc->port.tty) {
2812                                 release_console_sem();
2813                                 return -ERESTARTSYS;
2814                         }
2815                         tty->driver_data = vc;
2816                         vc->port.tty = tty;
2817
2818                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2819                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2820                                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2821                         }
2822                         if (vc->vc_utf)
2823                                 tty->termios->c_iflag |= IUTF8;
2824                         else
2825                                 tty->termios->c_iflag &= ~IUTF8;
2826                         release_console_sem();
2827                         return ret;
2828                 }
2829         }
2830         release_console_sem();
2831         return ret;
2832 }
2833
2834 static void con_close(struct tty_struct *tty, struct file *filp)
2835 {
2836         /* Nothing to do - we defer to shutdown */
2837 }
2838
2839 static void con_shutdown(struct tty_struct *tty)
2840 {
2841         struct vc_data *vc = tty->driver_data;
2842         BUG_ON(vc == NULL);
2843         acquire_console_sem();
2844         vc->port.tty = NULL;
2845         release_console_sem();
2846         tty_shutdown(tty);
2847 }
2848
2849 static int default_italic_color    = 2; // green (ASCII)
2850 static int default_underline_color = 3; // cyan (ASCII)
2851 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2852 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2853
2854 static void vc_init(struct vc_data *vc, unsigned int rows,
2855                     unsigned int cols, int do_clear)
2856 {
2857         int j, k ;
2858
2859         vc->vc_cols = cols;
2860         vc->vc_rows = rows;
2861         vc->vc_size_row = cols << 1;
2862         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2863
2864         set_origin(vc);
2865         vc->vc_pos = vc->vc_origin;
2866         reset_vc(vc);
2867         for (j=k=0; j<16; j++) {
2868                 vc->vc_palette[k++] = default_red[j] ;
2869                 vc->vc_palette[k++] = default_grn[j] ;
2870                 vc->vc_palette[k++] = default_blu[j] ;
2871         }
2872         vc->vc_def_color       = 0x07;   /* white */
2873         vc->vc_ulcolor         = default_underline_color;
2874         vc->vc_itcolor         = default_italic_color;
2875         vc->vc_halfcolor       = 0x08;   /* grey */
2876         init_waitqueue_head(&vc->paste_wait);
2877         reset_terminal(vc, do_clear);
2878 }
2879
2880 /*
2881  * This routine initializes console interrupts, and does nothing
2882  * else. If you want the screen to clear, call tty_write with
2883  * the appropriate escape-sequence.
2884  */
2885
2886 static int __init con_init(void)
2887 {
2888         const char *display_desc = NULL;
2889         struct vc_data *vc;
2890         unsigned int currcons = 0, i;
2891
2892         acquire_console_sem();
2893
2894         if (conswitchp)
2895                 display_desc = conswitchp->con_startup();
2896         if (!display_desc) {
2897                 fg_console = 0;
2898                 release_console_sem();
2899                 return 0;
2900         }
2901
2902         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2903                 struct con_driver *con_driver = &registered_con_driver[i];
2904
2905                 if (con_driver->con == NULL) {
2906                         con_driver->con = conswitchp;
2907                         con_driver->desc = display_desc;
2908                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2909                         con_driver->first = 0;
2910                         con_driver->last = MAX_NR_CONSOLES - 1;
2911                         break;
2912                 }
2913         }
2914
2915         for (i = 0; i < MAX_NR_CONSOLES; i++)
2916                 con_driver_map[i] = conswitchp;
2917
2918         if (blankinterval) {
2919                 blank_state = blank_normal_wait;
2920                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2921         }
2922
2923         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2924                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2925                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2926                 tty_port_init(&vc->port);
2927                 visual_init(vc, currcons, 1);
2928                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2929                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2930                         currcons || !vc->vc_sw->con_save_screen);
2931         }
2932         currcons = fg_console = 0;
2933         master_display_fg = vc = vc_cons[currcons].d;
2934         set_origin(vc);
2935         save_screen(vc);
2936         gotoxy(vc, vc->vc_x, vc->vc_y);
2937         csi_J(vc, 0);
2938         update_screen(vc);
2939         printk("Console: %s %s %dx%d",
2940                 vc->vc_can_do_color ? "colour" : "mono",
2941                 display_desc, vc->vc_cols, vc->vc_rows);
2942         printable = 1;
2943         printk("\n");
2944
2945         release_console_sem();
2946
2947 #ifdef CONFIG_VT_CONSOLE
2948         register_console(&vt_console_driver);
2949 #endif
2950         return 0;
2951 }
2952 console_initcall(con_init);
2953
2954 static const struct tty_operations con_ops = {
2955         .open = con_open,
2956         .close = con_close,
2957         .write = con_write,
2958         .write_room = con_write_room,
2959         .put_char = con_put_char,
2960         .flush_chars = con_flush_chars,
2961         .chars_in_buffer = con_chars_in_buffer,
2962         .ioctl = vt_ioctl,
2963 #ifdef CONFIG_COMPAT
2964         .compat_ioctl = vt_compat_ioctl,
2965 #endif
2966         .stop = con_stop,
2967         .start = con_start,
2968         .throttle = con_throttle,
2969         .unthrottle = con_unthrottle,
2970         .resize = vt_resize,
2971         .shutdown = con_shutdown
2972 };
2973
2974 static struct cdev vc0_cdev;
2975
2976 int __init vty_init(const struct file_operations *console_fops)
2977 {
2978         cdev_init(&vc0_cdev, console_fops);
2979         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2980             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2981                 panic("Couldn't register /dev/tty0 driver\n");
2982         device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2983
2984         vcs_init();
2985
2986         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2987         if (!console_driver)
2988                 panic("Couldn't allocate console driver\n");
2989         console_driver->owner = THIS_MODULE;
2990         console_driver->name = "tty";
2991         console_driver->name_base = 1;
2992         console_driver->major = TTY_MAJOR;
2993         console_driver->minor_start = 1;
2994         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2995         console_driver->init_termios = tty_std_termios;
2996         if (default_utf8)
2997                 console_driver->init_termios.c_iflag |= IUTF8;
2998         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2999         tty_set_operations(console_driver, &con_ops);
3000         if (tty_register_driver(console_driver))
3001                 panic("Couldn't register console driver\n");
3002         kbd_init();
3003         console_map_init();
3004 #ifdef CONFIG_MDA_CONSOLE
3005         mda_console_init();
3006 #endif
3007         return 0;
3008 }
3009
3010 #ifndef VT_SINGLE_DRIVER
3011
3012 static struct class *vtconsole_class;
3013
3014 static int bind_con_driver(const struct consw *csw, int first, int last,
3015                            int deflt)
3016 {
3017         struct module *owner = csw->owner;
3018         const char *desc = NULL;
3019         struct con_driver *con_driver;
3020         int i, j = -1, k = -1, retval = -ENODEV;
3021
3022         if (!try_module_get(owner))
3023                 return -ENODEV;
3024
3025         acquire_console_sem();
3026
3027         /* check if driver is registered */
3028         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3029                 con_driver = &registered_con_driver[i];
3030
3031                 if (con_driver->con == csw) {
3032                         desc = con_driver->desc;
3033                         retval = 0;
3034                         break;
3035                 }
3036         }
3037
3038         if (retval)
3039                 goto err;
3040
3041         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3042                 csw->con_startup();
3043                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3044         }
3045
3046         if (deflt) {
3047                 if (conswitchp)
3048                         module_put(conswitchp->owner);
3049
3050                 __module_get(owner);
3051                 conswitchp = csw;
3052         }
3053
3054         first = max(first, con_driver->first);
3055         last = min(last, con_driver->last);
3056
3057         for (i = first; i <= last; i++) {
3058                 int old_was_color;
3059                 struct vc_data *vc = vc_cons[i].d;
3060
3061                 if (con_driver_map[i])
3062                         module_put(con_driver_map[i]->owner);
3063                 __module_get(owner);
3064                 con_driver_map[i] = csw;
3065
3066                 if (!vc || !vc->vc_sw)
3067                         continue;
3068
3069                 j = i;
3070
3071                 if (CON_IS_VISIBLE(vc)) {
3072                         k = i;
3073                         save_screen(vc);
3074                 }
3075
3076                 old_was_color = vc->vc_can_do_color;
3077                 vc->vc_sw->con_deinit(vc);
3078                 if (!vc->vc_origin)
3079                         vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3080                 visual_init(vc, i, 0);
3081                 set_origin(vc);
3082                 update_attr(vc);
3083
3084                 /* If the console changed between mono <-> color, then
3085                  * the attributes in the screenbuf will be wrong.  The
3086                  * following resets all attributes to something sane.
3087                  */
3088                 if (old_was_color != vc->vc_can_do_color)
3089                         clear_buffer_attributes(vc);
3090         }
3091
3092         printk("Console: switching ");
3093         if (!deflt)
3094                 printk("consoles %d-%d ", first+1, last+1);
3095         if (j >= 0) {
3096                 struct vc_data *vc = vc_cons[j].d;
3097
3098                 printk("to %s %s %dx%d\n",
3099                        vc->vc_can_do_color ? "colour" : "mono",
3100                        desc, vc->vc_cols, vc->vc_rows);
3101
3102                 if (k >= 0) {
3103                         vc = vc_cons[k].d;
3104                         update_screen(vc);
3105                 }
3106         } else
3107                 printk("to %s\n", desc);
3108
3109         retval = 0;
3110 err:
3111         release_console_sem();
3112         module_put(owner);
3113         return retval;
3114 };
3115
3116 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3117 static int con_is_graphics(const struct consw *csw, int first, int last)
3118 {
3119         int i, retval = 0;
3120
3121         for (i = first; i <= last; i++) {
3122                 struct vc_data *vc = vc_cons[i].d;
3123
3124                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3125                         retval = 1;
3126                         break;
3127                 }
3128         }
3129
3130         return retval;
3131 }
3132
3133 /**
3134  * unbind_con_driver - unbind a console driver
3135  * @csw: pointer to console driver to unregister
3136  * @first: first in range of consoles that @csw should be unbound from
3137  * @last: last in range of consoles that @csw should be unbound from
3138  * @deflt: should next bound console driver be default after @csw is unbound?
3139  *
3140  * To unbind a driver from all possible consoles, pass 0 as @first and
3141  * %MAX_NR_CONSOLES as @last.
3142  *
3143  * @deflt controls whether the console that ends up replacing @csw should be
3144  * the default console.
3145  *
3146  * RETURNS:
3147  * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3148  * or 0 on success.
3149  */
3150 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3151 {
3152         struct module *owner = csw->owner;
3153         const struct consw *defcsw = NULL;
3154         struct con_driver *con_driver = NULL, *con_back = NULL;
3155         int i, retval = -ENODEV;
3156
3157         if (!try_module_get(owner))
3158                 return -ENODEV;
3159
3160         acquire_console_sem();
3161
3162         /* check if driver is registered and if it is unbindable */
3163         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3164                 con_driver = &registered_con_driver[i];
3165
3166                 if (con_driver->con == csw &&
3167                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3168                         retval = 0;
3169                         break;
3170                 }
3171         }
3172
3173         if (retval) {
3174                 release_console_sem();
3175                 goto err;
3176         }
3177
3178         retval = -ENODEV;
3179
3180         /* check if backup driver exists */
3181         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3182                 con_back = &registered_con_driver[i];
3183
3184                 if (con_back->con &&
3185                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3186                         defcsw = con_back->con;
3187                         retval = 0;
3188                         break;
3189                 }
3190         }
3191
3192         if (retval) {
3193                 release_console_sem();
3194                 goto err;
3195         }
3196
3197         if (!con_is_bound(csw)) {
3198                 release_console_sem();
3199                 goto err;
3200         }
3201
3202         first = max(first, con_driver->first);
3203         last = min(last, con_driver->last);
3204
3205         for (i = first; i <= last; i++) {
3206                 if (con_driver_map[i] == csw) {
3207                         module_put(csw->owner);
3208                         con_driver_map[i] = NULL;
3209                 }
3210         }
3211
3212         if (!con_is_bound(defcsw)) {
3213                 const struct consw *defconsw = conswitchp;
3214
3215                 defcsw->con_startup();
3216                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3217                 /*
3218                  * vgacon may change the default driver to point
3219                  * to dummycon, we restore it here...
3220                  */
3221                 conswitchp = defconsw;
3222         }
3223
3224         if (!con_is_bound(csw))
3225                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3226
3227         release_console_sem();
3228         /* ignore return value, binding should not fail */
3229         bind_con_driver(defcsw, first, last, deflt);
3230 err:
3231         module_put(owner);
3232         return retval;
3233
3234 }
3235 EXPORT_SYMBOL(unbind_con_driver);
3236
3237 static int vt_bind(struct con_driver *con)
3238 {
3239         const struct consw *defcsw = NULL, *csw = NULL;
3240         int i, more = 1, first = -1, last = -1, deflt = 0;
3241
3242         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3243             con_is_graphics(con->con, con->first, con->last))
3244                 goto err;
3245
3246         csw = con->con;
3247
3248         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3249                 struct con_driver *con = &registered_con_driver[i];
3250
3251                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3252                         defcsw = con->con;
3253                         break;
3254                 }
3255         }
3256
3257         if (!defcsw)
3258                 goto err;
3259
3260         while (more) {
3261                 more = 0;
3262
3263                 for (i = con->first; i <= con->last; i++) {
3264                         if (con_driver_map[i] == defcsw) {
3265                                 if (first == -1)
3266                                         first = i;
3267                                 last = i;
3268                                 more = 1;
3269                         } else if (first != -1)
3270                                 break;
3271                 }
3272
3273                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3274                         deflt = 1;
3275
3276                 if (first != -1)
3277                         bind_con_driver(csw, first, last, deflt);
3278
3279                 first = -1;
3280                 last = -1;
3281                 deflt = 0;
3282         }
3283
3284 err:
3285         return 0;
3286 }
3287
3288 static int vt_unbind(struct con_driver *con)
3289 {
3290         const struct consw *csw = NULL;
3291         int i, more = 1, first = -1, last = -1, deflt = 0;
3292
3293         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3294             con_is_graphics(con->con, con->first, con->last))
3295                 goto err;
3296
3297         csw = con->con;
3298
3299         while (more) {
3300                 more = 0;
3301
3302                 for (i = con->first; i <= con->last; i++) {
3303                         if (con_driver_map[i] == csw) {
3304                                 if (first == -1)
3305                                         first = i;
3306                                 last = i;
3307                                 more = 1;
3308                         } else if (first != -1)
3309                                 break;
3310                 }
3311
3312                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3313                         deflt = 1;
3314
3315                 if (first != -1)
3316                         unbind_con_driver(csw, first, last, deflt);
3317
3318                 first = -1;
3319                 last = -1;
3320                 deflt = 0;
3321         }
3322
3323 err:
3324         return 0;
3325 }
3326 #else
3327 static inline int vt_bind(struct con_driver *con)
3328 {
3329         return 0;
3330 }
3331 static inline int vt_unbind(struct con_driver *con)
3332 {
3333         return 0;
3334 }
3335 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3336
3337 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3338                           const char *buf, size_t count)
3339 {
3340         struct con_driver *con = dev_get_drvdata(dev);
3341         int bind = simple_strtoul(buf, NULL, 0);
3342
3343         if (bind)
3344                 vt_bind(con);
3345         else
3346                 vt_unbind(con);
3347
3348         return count;
3349 }
3350
3351 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3352                          char *buf)
3353 {
3354         struct con_driver *con = dev_get_drvdata(dev);
3355         int bind = con_is_bound(con->con);
3356
3357         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3358 }
3359
3360 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3361                          char *buf)
3362 {
3363         struct con_driver *con = dev_get_drvdata(dev);
3364
3365         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3366                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3367                          con->desc);
3368
3369 }
3370
3371 static struct device_attribute device_attrs[] = {
3372         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3373         __ATTR(name, S_IRUGO, show_name, NULL),
3374 };
3375
3376 static int vtconsole_init_device(struct con_driver *con)
3377 {
3378         int i;
3379         int error = 0;
3380
3381         con->flag |= CON_DRIVER_FLAG_ATTR;
3382         dev_set_drvdata(con->dev, con);
3383         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3384                 error = device_create_file(con->dev, &device_attrs[i]);
3385                 if (error)
3386                         break;
3387         }
3388
3389         if (error) {
3390                 while (--i >= 0)
3391                         device_remove_file(con->dev, &device_attrs[i]);
3392                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3393         }
3394
3395         return error;
3396 }
3397
3398 static void vtconsole_deinit_device(struct con_driver *con)
3399 {
3400         int i;
3401
3402         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3403                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3404                         device_remove_file(con->dev, &device_attrs[i]);
3405                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3406         }
3407 }
3408
3409 /**
3410  * con_is_bound - checks if driver is bound to the console
3411  * @csw: console driver
3412  *
3413  * RETURNS: zero if unbound, nonzero if bound
3414  *
3415  * Drivers can call this and if zero, they should release
3416  * all resources allocated on con_startup()
3417  */
3418 int con_is_bound(const struct consw *csw)
3419 {
3420         int i, bound = 0;
3421
3422         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3423                 if (con_driver_map[i] == csw) {
3424                         bound = 1;
3425                         break;
3426                 }
3427         }
3428
3429         return bound;
3430 }
3431 EXPORT_SYMBOL(con_is_bound);
3432
3433 /**
3434  * con_debug_enter - prepare the console for the kernel debugger
3435  * @sw: console driver
3436  *
3437  * Called when the console is taken over by the kernel debugger, this
3438  * function needs to save the current console state, then put the console
3439  * into a state suitable for the kernel debugger.
3440  *
3441  * RETURNS:
3442  * Zero on success, nonzero if a failure occurred when trying to prepare
3443  * the console for the debugger.
3444  */
3445 int con_debug_enter(struct vc_data *vc)
3446 {
3447         int ret = 0;
3448
3449         saved_fg_console = fg_console;
3450         saved_last_console = last_console;
3451         saved_want_console = want_console;
3452         saved_vc_mode = vc->vc_mode;
3453         saved_console_blanked = console_blanked;
3454         vc->vc_mode = KD_TEXT;
3455         console_blanked = 0;
3456         if (vc->vc_sw->con_debug_enter)
3457                 ret = vc->vc_sw->con_debug_enter(vc);
3458 #ifdef CONFIG_KGDB_KDB
3459         /* Set the initial LINES variable if it is not already set */
3460         if (vc->vc_rows < 999) {
3461                 int linecount;
3462                 char lns[4];
3463                 const char *setargs[3] = {
3464                         "set",
3465                         "LINES",
3466                         lns,
3467                 };
3468                 if (kdbgetintenv(setargs[0], &linecount)) {
3469                         snprintf(lns, 4, "%i", vc->vc_rows);
3470                         kdb_set(2, setargs);
3471                 }
3472         }
3473 #endif /* CONFIG_KGDB_KDB */
3474         return ret;
3475 }
3476 EXPORT_SYMBOL_GPL(con_debug_enter);
3477
3478 /**
3479  * con_debug_leave - restore console state
3480  * @sw: console driver
3481  *
3482  * Restore the console state to what it was before the kernel debugger
3483  * was invoked.
3484  *
3485  * RETURNS:
3486  * Zero on success, nonzero if a failure occurred when trying to restore
3487  * the console.
3488  */
3489 int con_debug_leave(void)
3490 {
3491         struct vc_data *vc;
3492         int ret = 0;
3493
3494         fg_console = saved_fg_console;
3495         last_console = saved_last_console;
3496         want_console = saved_want_console;
3497         console_blanked = saved_console_blanked;
3498         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3499
3500         vc = vc_cons[fg_console].d;
3501         if (vc->vc_sw->con_debug_leave)
3502                 ret = vc->vc_sw->con_debug_leave(vc);
3503         return ret;
3504 }
3505 EXPORT_SYMBOL_GPL(con_debug_leave);
3506
3507 /**
3508  * register_con_driver - register console driver to console layer
3509  * @csw: console driver
3510  * @first: the first console to take over, minimum value is 0
3511  * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3512  *
3513  * DESCRIPTION: This function registers a console driver which can later
3514  * bind to a range of consoles specified by @first and @last. It will
3515  * also initialize the console driver by calling con_startup().
3516  */
3517 int register_con_driver(const struct consw *csw, int first, int last)
3518 {
3519         struct module *owner = csw->owner;
3520         struct con_driver *con_driver;
3521         const char *desc;
3522         int i, retval = 0;
3523
3524         if (!try_module_get(owner))
3525                 return -ENODEV;
3526
3527         acquire_console_sem();
3528
3529         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3530                 con_driver = &registered_con_driver[i];
3531
3532                 /* already registered */
3533                 if (con_driver->con == csw)
3534                         retval = -EINVAL;
3535         }
3536
3537         if (retval)
3538                 goto err;
3539
3540         desc = csw->con_startup();
3541
3542         if (!desc)
3543                 goto err;
3544
3545         retval = -EINVAL;
3546
3547         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3548                 con_driver = &registered_con_driver[i];
3549
3550                 if (con_driver->con == NULL) {
3551                         con_driver->con = csw;
3552                         con_driver->desc = desc;
3553                         con_driver->node = i;
3554                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3555                                            CON_DRIVER_FLAG_INIT;
3556                         con_driver->first = first;
3557                         con_driver->last = last;
3558                         retval = 0;
3559                         break;
3560                 }
3561         }
3562
3563         if (retval)
3564                 goto err;
3565
3566         con_driver->dev = device_create(vtconsole_class, NULL,
3567                                                 MKDEV(0, con_driver->node),
3568                                                 NULL, "vtcon%i",
3569                                                 con_driver->node);
3570
3571         if (IS_ERR(con_driver->dev)) {
3572                 printk(KERN_WARNING "Unable to create device for %s; "
3573                        "errno = %ld\n", con_driver->desc,
3574                        PTR_ERR(con_driver->dev));
3575                 con_driver->dev = NULL;
3576         } else {
3577                 vtconsole_init_device(con_driver);
3578         }
3579
3580 err:
3581         release_console_sem();
3582         module_put(owner);
3583         return retval;
3584 }
3585 EXPORT_SYMBOL(register_con_driver);
3586
3587 /**
3588  * unregister_con_driver - unregister console driver from console layer
3589  * @csw: console driver
3590  *
3591  * DESCRIPTION: All drivers that registers to the console layer must
3592  * call this function upon exit, or if the console driver is in a state
3593  * where it won't be able to handle console services, such as the
3594  * framebuffer console without loaded framebuffer drivers.
3595  *
3596  * The driver must unbind first prior to unregistration.
3597  */
3598 int unregister_con_driver(const struct consw *csw)
3599 {
3600         int i, retval = -ENODEV;
3601
3602         acquire_console_sem();
3603
3604         /* cannot unregister a bound driver */
3605         if (con_is_bound(csw))
3606                 goto err;
3607
3608         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3609                 struct con_driver *con_driver = &registered_con_driver[i];
3610
3611                 if (con_driver->con == csw &&
3612                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3613                         vtconsole_deinit_device(con_driver);
3614                         device_destroy(vtconsole_class,
3615                                        MKDEV(0, con_driver->node));
3616                         con_driver->con = NULL;
3617                         con_driver->desc = NULL;
3618                         con_driver->dev = NULL;
3619                         con_driver->node = 0;
3620                         con_driver->flag = 0;
3621                         con_driver->first = 0;
3622                         con_driver->last = 0;
3623                         retval = 0;
3624                         break;
3625                 }
3626         }
3627 err:
3628         release_console_sem();
3629         return retval;
3630 }
3631 EXPORT_SYMBOL(unregister_con_driver);
3632
3633 /*
3634  *      If we support more console drivers, this function is used
3635  *      when a driver wants to take over some existing consoles
3636  *      and become default driver for newly opened ones.
3637  *
3638  *      take_over_console is basically a register followed by unbind
3639  */
3640 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3641 {
3642         int err;
3643
3644         err = register_con_driver(csw, first, last);
3645
3646         if (!err)
3647                 bind_con_driver(csw, first, last, deflt);
3648
3649         return err;
3650 }
3651
3652 /*
3653  * give_up_console is a wrapper to unregister_con_driver. It will only
3654  * work if driver is fully unbound.
3655  */
3656 void give_up_console(const struct consw *csw)
3657 {
3658         unregister_con_driver(csw);
3659 }
3660
3661 static int __init vtconsole_class_init(void)
3662 {
3663         int i;
3664
3665         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3666         if (IS_ERR(vtconsole_class)) {
3667                 printk(KERN_WARNING "Unable to create vt console class; "
3668                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3669                 vtconsole_class = NULL;
3670         }
3671
3672         /* Add system drivers to sysfs */
3673         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3674                 struct con_driver *con = &registered_con_driver[i];
3675
3676                 if (con->con && !con->dev) {
3677                         con->dev = device_create(vtconsole_class, NULL,
3678                                                          MKDEV(0, con->node),
3679                                                          NULL, "vtcon%i",
3680                                                          con->node);
3681
3682                         if (IS_ERR(con->dev)) {
3683                                 printk(KERN_WARNING "Unable to create "
3684                                        "device for %s; errno = %ld\n",
3685                                        con->desc, PTR_ERR(con->dev));
3686                                 con->dev = NULL;
3687                         } else {
3688                                 vtconsole_init_device(con);
3689                         }
3690                 }
3691         }
3692
3693         return 0;
3694 }
3695 postcore_initcall(vtconsole_class_init);
3696
3697 #endif
3698
3699 /*
3700  *      Screen blanking
3701  */
3702
3703 static int set_vesa_blanking(char __user *p)
3704 {
3705         unsigned int mode;
3706
3707         if (get_user(mode, p + 1))
3708                 return -EFAULT;
3709
3710         vesa_blank_mode = (mode < 4) ? mode : 0;
3711         return 0;
3712 }
3713
3714 void do_blank_screen(int entering_gfx)
3715 {
3716         struct vc_data *vc = vc_cons[fg_console].d;
3717         int i;
3718
3719         WARN_CONSOLE_UNLOCKED();
3720
3721         if (console_blanked) {
3722                 if (blank_state == blank_vesa_wait) {
3723                         blank_state = blank_off;
3724                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3725                 }
3726                 return;
3727         }
3728
3729         /* entering graphics mode? */
3730         if (entering_gfx) {
3731                 hide_cursor(vc);
3732                 save_screen(vc);
3733                 vc->vc_sw->con_blank(vc, -1, 1);
3734                 console_blanked = fg_console + 1;
3735                 blank_state = blank_off;
3736                 set_origin(vc);
3737                 return;
3738         }
3739
3740         if (blank_state != blank_normal_wait)
3741                 return;
3742         blank_state = blank_off;
3743
3744         /* don't blank graphics */
3745         if (vc->vc_mode != KD_TEXT) {
3746                 console_blanked = fg_console + 1;
3747                 return;
3748         }
3749
3750         hide_cursor(vc);
3751         del_timer_sync(&console_timer);
3752         blank_timer_expired = 0;
3753
3754         save_screen(vc);
3755         /* In case we need to reset origin, blanking hook returns 1 */
3756         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3757         console_blanked = fg_console + 1;
3758         if (i)
3759                 set_origin(vc);
3760
3761         if (console_blank_hook && console_blank_hook(1))
3762                 return;
3763
3764         if (vesa_off_interval && vesa_blank_mode) {
3765                 blank_state = blank_vesa_wait;
3766                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3767         }
3768         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3769 }
3770 EXPORT_SYMBOL(do_blank_screen);
3771
3772 /*
3773  * Called by timer as well as from vt_console_driver
3774  */
3775 void do_unblank_screen(int leaving_gfx)
3776 {
3777         struct vc_data *vc;
3778
3779         /* This should now always be called from a "sane" (read: can schedule)
3780          * context for the sake of the low level drivers, except in the special
3781          * case of oops_in_progress
3782          */
3783         if (!oops_in_progress)
3784                 might_sleep();
3785
3786         WARN_CONSOLE_UNLOCKED();
3787
3788         ignore_poke = 0;
3789         if (!console_blanked)
3790                 return;
3791         if (!vc_cons_allocated(fg_console)) {
3792                 /* impossible */
3793                 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3794                 return;
3795         }
3796         vc = vc_cons[fg_console].d;
3797         /* Try to unblank in oops case too */
3798         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3799                 return; /* but leave console_blanked != 0 */
3800
3801         if (blankinterval) {
3802                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3803                 blank_state = blank_normal_wait;
3804         }
3805
3806         console_blanked = 0;
3807         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3808                 /* Low-level driver cannot restore -> do it ourselves */
3809                 update_screen(vc);
3810         if (console_blank_hook)
3811                 console_blank_hook(0);
3812         set_palette(vc);
3813         set_cursor(vc);
3814         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3815 }
3816 EXPORT_SYMBOL(do_unblank_screen);
3817
3818 /*
3819  * This is called by the outside world to cause a forced unblank, mostly for
3820  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3821  * call it with 1 as an argument and so force a mode restore... that may kill
3822  * X or at least garbage the screen but would also make the Oops visible...
3823  */
3824 void unblank_screen(void)
3825 {
3826         do_unblank_screen(0);
3827 }
3828
3829 /*
3830  * We defer the timer blanking to work queue so it can take the console mutex
3831  * (console operations can still happen at irq time, but only from printk which
3832  * has the console mutex. Not perfect yet, but better than no locking
3833  */
3834 static void blank_screen_t(unsigned long dummy)
3835 {
3836         if (unlikely(!keventd_up())) {
3837                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3838                 return;
3839         }
3840         blank_timer_expired = 1;
3841         schedule_work(&console_work);
3842 }
3843
3844 void poke_blanked_console(void)
3845 {
3846         WARN_CONSOLE_UNLOCKED();
3847
3848         /* Add this so we quickly catch whoever might call us in a non
3849          * safe context. Nowadays, unblank_screen() isn't to be called in
3850          * atomic contexts and is allowed to schedule (with the special case
3851          * of oops_in_progress, but that isn't of any concern for this
3852          * function. --BenH.
3853          */
3854         might_sleep();
3855
3856         /* This isn't perfectly race free, but a race here would be mostly harmless,
3857          * at worse, we'll do a spurrious blank and it's unlikely
3858          */
3859         del_timer(&console_timer);
3860         blank_timer_expired = 0;
3861
3862         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3863                 return;
3864         if (console_blanked)
3865                 unblank_screen();
3866         else if (blankinterval) {
3867                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3868                 blank_state = blank_normal_wait;
3869         }
3870 }
3871
3872 /*
3873  *      Palettes
3874  */
3875
3876 static void set_palette(struct vc_data *vc)
3877 {
3878         WARN_CONSOLE_UNLOCKED();
3879
3880         if (vc->vc_mode != KD_GRAPHICS)
3881                 vc->vc_sw->con_set_palette(vc, color_table);
3882 }
3883
3884 static int set_get_cmap(unsigned char __user *arg, int set)
3885 {
3886     int i, j, k;
3887
3888     WARN_CONSOLE_UNLOCKED();
3889
3890     for (i = 0; i < 16; i++)
3891         if (set) {
3892             get_user(default_red[i], arg++);
3893             get_user(default_grn[i], arg++);
3894             get_user(default_blu[i], arg++);
3895         } else {
3896             put_user(default_red[i], arg++);
3897             put_user(default_grn[i], arg++);
3898             put_user(default_blu[i], arg++);
3899         }
3900     if (set) {
3901         for (i = 0; i < MAX_NR_CONSOLES; i++)
3902             if (vc_cons_allocated(i)) {
3903                 for (j = k = 0; j < 16; j++) {
3904                     vc_cons[i].d->vc_palette[k++] = default_red[j];
3905                     vc_cons[i].d->vc_palette[k++] = default_grn[j];
3906                     vc_cons[i].d->vc_palette[k++] = default_blu[j];
3907                 }
3908                 set_palette(vc_cons[i].d);
3909             }
3910     }
3911     return 0;
3912 }
3913
3914 /*
3915  * Load palette into the DAC registers. arg points to a colour
3916  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3917  */
3918
3919 int con_set_cmap(unsigned char __user *arg)
3920 {
3921         int rc;
3922
3923         acquire_console_sem();
3924         rc = set_get_cmap (arg,1);
3925         release_console_sem();
3926
3927         return rc;
3928 }
3929
3930 int con_get_cmap(unsigned char __user *arg)
3931 {
3932         int rc;
3933
3934         acquire_console_sem();
3935         rc = set_get_cmap (arg,0);
3936         release_console_sem();
3937
3938         return rc;
3939 }
3940
3941 void reset_palette(struct vc_data *vc)
3942 {
3943         int j, k;
3944         for (j=k=0; j<16; j++) {
3945                 vc->vc_palette[k++] = default_red[j];
3946                 vc->vc_palette[k++] = default_grn[j];
3947                 vc->vc_palette[k++] = default_blu[j];
3948         }
3949         set_palette(vc);
3950 }
3951
3952 /*
3953  *  Font switching
3954  *
3955  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3956  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3957  *  depending on width) reserved for each character which is kinda wasty, but
3958  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3959  *  is upto the actual low-level console-driver convert data into its favorite
3960  *  format (maybe we should add a `fontoffset' field to the `display'
3961  *  structure so we won't have to convert the fontdata all the time.
3962  *  /Jes
3963  */
3964
3965 #define max_font_size 65536
3966
3967 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3968 {
3969         struct console_font font;
3970         int rc = -EINVAL;
3971         int c;
3972
3973         if (vc->vc_mode != KD_TEXT)
3974                 return -EINVAL;
3975
3976         if (op->data) {
3977                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3978                 if (!font.data)
3979                         return -ENOMEM;
3980         } else
3981                 font.data = NULL;
3982
3983         acquire_console_sem();
3984         if (vc->vc_sw->con_font_get)
3985                 rc = vc->vc_sw->con_font_get(vc, &font);
3986         else
3987                 rc = -ENOSYS;
3988         release_console_sem();
3989
3990         if (rc)
3991                 goto out;
3992
3993         c = (font.width+7)/8 * 32 * font.charcount;
3994
3995         if (op->data && font.charcount > op->charcount)
3996                 rc = -ENOSPC;
3997         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3998                 if (font.width > op->width || font.height > op->height)
3999                         rc = -ENOSPC;
4000         } else {
4001                 if (font.width != 8)
4002                         rc = -EIO;
4003                 else if ((op->height && font.height > op->height) ||
4004                          font.height > 32)
4005                         rc = -ENOSPC;
4006         }
4007         if (rc)
4008                 goto out;
4009
4010         op->height = font.height;
4011         op->width = font.width;
4012         op->charcount = font.charcount;
4013
4014         if (op->data && copy_to_user(op->data, font.data, c))
4015                 rc = -EFAULT;
4016
4017 out:
4018         kfree(font.data);
4019         return rc;
4020 }
4021
4022 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4023 {
4024         struct console_font font;
4025         int rc = -EINVAL;
4026         int size;
4027
4028         if (vc->vc_mode != KD_TEXT)
4029                 return -EINVAL;
4030         if (!op->data)
4031                 return -EINVAL;
4032         if (op->charcount > 512)
4033                 return -EINVAL;
4034         if (!op->height) {              /* Need to guess font height [compat] */
4035                 int h, i;
4036                 u8 __user *charmap = op->data;
4037                 u8 tmp;
4038
4039                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4040                    so that we can get rid of this soon */
4041                 if (!(op->flags & KD_FONT_FLAG_OLD))
4042                         return -EINVAL;
4043                 for (h = 32; h > 0; h--)
4044                         for (i = 0; i < op->charcount; i++) {
4045                                 if (get_user(tmp, &charmap[32*i+h-1]))
4046                                         return -EFAULT;
4047                                 if (tmp)
4048                                         goto nonzero;
4049                         }
4050                 return -EINVAL;
4051         nonzero:
4052                 op->height = h;
4053         }
4054         if (op->width <= 0 || op->width > 32 || op->height > 32)
4055                 return -EINVAL;
4056         size = (op->width+7)/8 * 32 * op->charcount;
4057         if (size > max_font_size)
4058                 return -ENOSPC;
4059         font.charcount = op->charcount;
4060         font.height = op->height;
4061         font.width = op->width;
4062         font.data = memdup_user(op->data, size);
4063         if (IS_ERR(font.data))
4064                 return PTR_ERR(font.data);
4065         acquire_console_sem();
4066         if (vc->vc_sw->con_font_set)
4067                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4068         else
4069                 rc = -ENOSYS;
4070         release_console_sem();
4071         kfree(font.data);
4072         return rc;
4073 }
4074
4075 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4076 {
4077         struct console_font font = {.width = op->width, .height = op->height};
4078         char name[MAX_FONT_NAME];
4079         char *s = name;
4080         int rc;
4081
4082         if (vc->vc_mode != KD_TEXT)
4083                 return -EINVAL;
4084
4085         if (!op->data)
4086                 s = NULL;
4087         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4088                 return -EFAULT;
4089         else
4090                 name[MAX_FONT_NAME - 1] = 0;
4091
4092         acquire_console_sem();
4093         if (vc->vc_sw->con_font_default)
4094                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4095         else
4096                 rc = -ENOSYS;
4097         release_console_sem();
4098         if (!rc) {
4099                 op->width = font.width;
4100                 op->height = font.height;
4101         }
4102         return rc;
4103 }
4104
4105 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4106 {
4107         int con = op->height;
4108         int rc;
4109
4110         if (vc->vc_mode != KD_TEXT)
4111                 return -EINVAL;
4112
4113         acquire_console_sem();
4114         if (!vc->vc_sw->con_font_copy)
4115                 rc = -ENOSYS;
4116         else if (con < 0 || !vc_cons_allocated(con))
4117                 rc = -ENOTTY;
4118         else if (con == vc->vc_num)     /* nothing to do */
4119                 rc = 0;
4120         else
4121                 rc = vc->vc_sw->con_font_copy(vc, con);
4122         release_console_sem();
4123         return rc;
4124 }
4125
4126 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4127 {
4128         switch (op->op) {
4129         case KD_FONT_OP_SET:
4130                 return con_font_set(vc, op);
4131         case KD_FONT_OP_GET:
4132                 return con_font_get(vc, op);
4133         case KD_FONT_OP_SET_DEFAULT:
4134                 return con_font_default(vc, op);
4135         case KD_FONT_OP_COPY:
4136                 return con_font_copy(vc, op);
4137         }
4138         return -ENOSYS;
4139 }
4140
4141 /*
4142  *      Interface exported to selection and vcs.
4143  */
4144
4145 /* used by selection */
4146 u16 screen_glyph(struct vc_data *vc, int offset)
4147 {
4148         u16 w = scr_readw(screenpos(vc, offset, 1));
4149         u16 c = w & 0xff;
4150
4151         if (w & vc->vc_hi_font_mask)
4152                 c |= 0x100;
4153         return c;
4154 }
4155 EXPORT_SYMBOL_GPL(screen_glyph);
4156
4157 /* used by vcs - note the word offset */
4158 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4159 {
4160         return screenpos(vc, 2 * w_offset, viewed);
4161 }
4162
4163 void getconsxy(struct vc_data *vc, unsigned char *p)
4164 {
4165         p[0] = vc->vc_x;
4166         p[1] = vc->vc_y;
4167 }
4168
4169 void putconsxy(struct vc_data *vc, unsigned char *p)
4170 {
4171         hide_cursor(vc);
4172         gotoxy(vc, p[0], p[1]);
4173         set_cursor(vc);
4174 }
4175
4176 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4177 {
4178         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4179                 return softcursor_original;
4180         return scr_readw(org);
4181 }
4182
4183 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4184 {
4185         scr_writew(val, org);
4186         if ((unsigned long)org == vc->vc_pos) {
4187                 softcursor_original = -1;
4188                 add_softcursor(vc);
4189         }
4190 }
4191
4192 /*
4193  *      Visible symbols for modules
4194  */
4195
4196 EXPORT_SYMBOL(color_table);
4197 EXPORT_SYMBOL(default_red);
4198 EXPORT_SYMBOL(default_grn);
4199 EXPORT_SYMBOL(default_blu);
4200 EXPORT_SYMBOL(update_region);
4201 EXPORT_SYMBOL(redraw_screen);
4202 EXPORT_SYMBOL(vc_resize);
4203 EXPORT_SYMBOL(fg_console);
4204 EXPORT_SYMBOL(console_blank_hook);
4205 EXPORT_SYMBOL(console_blanked);
4206 EXPORT_SYMBOL(vc_cons);
4207 EXPORT_SYMBOL(global_cursor_default);
4208 #ifndef VT_SINGLE_DRIVER
4209 EXPORT_SYMBOL(take_over_console);
4210 EXPORT_SYMBOL(give_up_console);
4211 #endif