drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <g-hunt@ee.utah.edu>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21  *
  22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <poe@daimi.aau.dk>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <geert@linux-m68k.org>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <arno@usn.nl>
  39  *     - David Carter <carter@cs.bris.ac.uk>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111 #define CON_DRIVER_FLAG_ZOMBIE 8
 112
 113 struct con_driver {
 114         const struct consw *con;
 115         const char *desc;
 116         struct device *dev;
 117         int node;
 118         int first;
 119         int last;
 120         int flag;
 121 };
 122
 123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 124 const struct consw *conswitchp;
 125
 126 /* A bitmap for codes <32. A bit of 1 indicates that the code
 127  * corresponding to that bit number invokes some special action
 128  * (such as cursor movement) and should not be displayed as a
 129  * glyph unless the disp_ctrl mode is explicitly enabled.
 130  */
 131 #define CTRL_ACTION 0x0d00ff81
 132 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 133
 134 /*
 135  * Here is the default bell parameters: 750HZ, 1/8th of a second
 136  */
 137 #define DEFAULT_BELL_PITCH      750
 138 #define DEFAULT_BELL_DURATION   (HZ/8)
 139 #define DEFAULT_CURSOR_BLINK_MS 200
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void con_driver_unregister_callback(struct work_struct *ignored);
 159 static void blank_screen_t(unsigned long dummy);
 160 static void set_palette(struct vc_data *vc);
 161
 162 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 163
 164 static int printable;           /* Is console ready for printing? */
 165 int default_utf8 = true;
 166 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 167 int global_cursor_default = -1;
 168 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 169
 170 static int cur_default = CUR_DEFAULT;
 171 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 172
 173 /*
 174  * ignore_poke: don't unblank the screen when things are typed.  This is
 175  * mainly for the privacy of braille terminal users.
 176  */
 177 static int ignore_poke;
 178
 179 int do_poke_blanked_console;
 180 int console_blanked;
 181
 182 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 183 static int vesa_off_interval;
 184 static int blankinterval = 10*60;
 185 core_param(consoleblank, blankinterval, int, 0444);
 186
 187 static DECLARE_WORK(console_work, console_callback);
 188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 189
 190 /*
 191  * fg_console is the current virtual console,
 192  * last_console is the last used one,
 193  * want_console is the console we want to switch to,
 194  * saved_* variants are for save/restore around kernel debugger enter/leave
 195  */
 196 int fg_console;
 197 int last_console;
 198 int want_console = -1;
 199 static int saved_fg_console;
 200 static int saved_last_console;
 201 static int saved_want_console;
 202 static int saved_vc_mode;
 203 static int saved_console_blanked;
 204
 205 /*
 206  * For each existing display, we have a pointer to console currently visible
 207  * on that display, allowing consoles other than fg_console to be refreshed
 208  * appropriately. Unless the low-level driver supplies its own display_fg
 209  * variable, we use this one for the "master display".
 210  */
 211 static struct vc_data *master_display_fg;
 212
 213 /*
 214  * Unfortunately, we need to delay tty echo when we're currently writing to the
 215  * console since the code is (and always was) not re-entrant, so we schedule
 216  * all flip requests to process context with schedule-task() and run it from
 217  * console_callback().
 218  */
 219
 220 /*
 221  * For the same reason, we defer scrollback to the console callback.
 222  */
 223 static int scrollback_delta;
 224
 225 /*
 226  * Hook so that the power management routines can (un)blank
 227  * the console on our behalf.
 228  */
 229 int (*console_blank_hook)(int);
 230
 231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 232 static int blank_state;
 233 static int blank_timer_expired;
 234 enum {
 235         blank_off = 0,
 236         blank_normal_wait,
 237         blank_vesa_wait,
 238 };
 239
 240 /*
 241  * /sys/class/tty/tty0/
 242  *
 243  * the attribute 'active' contains the name of the current vc
 244  * console and it supports poll() to detect vc switches
 245  */
 246 static struct device *tty0dev;
 247
 248 /*
 249  * Notifier list for console events.
 250  */
 251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 252
 253 int register_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(register_vt_notifier);
 258
 259 int unregister_vt_notifier(struct notifier_block *nb)
 260 {
 261         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 262 }
 263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 264
 265 static void notify_write(struct vc_data *vc, unsigned int unicode)
 266 {
 267         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 269 }
 270
 271 static void notify_update(struct vc_data *vc)
 272 {
 273         struct vt_notifier_param param = { .vc = vc };
 274         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 275 }
 276 /*
 277  *      Low-Level Functions
 278  */
 279
 280 static inline bool con_is_fg(const struct vc_data *vc)
 281 {
 282         return vc->vc_num == fg_console;
 283 }
 284
 285 static inline bool con_should_update(const struct vc_data *vc)
 286 {
 287         return con_is_visible(vc) && !console_blanked;
 288 }
 289
 290 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 291 {
 292         unsigned short *p;
 293
 294         if (!viewed)
 295                 p = (unsigned short *)(vc->vc_origin + offset);
 296         else if (!vc->vc_sw->con_screen_pos)
 297                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 298         else
 299                 p = vc->vc_sw->con_screen_pos(vc, offset);
 300         return p;
 301 }
 302
 303 /* Called  from the keyboard irq path.. */
 304 static inline void scrolldelta(int lines)
 305 {
 306         /* FIXME */
 307         /* scrolldelta needs some kind of consistency lock, but the BKL was
 308            and still is not protecting versus the scheduled back end */
 309         scrollback_delta += lines;
 310         schedule_console_callback();
 311 }
 312
 313 void schedule_console_callback(void)
 314 {
 315         schedule_work(&console_work);
 316 }
 317
 318 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 319                 enum con_scroll dir, unsigned int nr)
 320 {
 321         u16 *clear, *d, *s;
 322
 323         if (t + nr >= b)
 324                 nr = b - t - 1;
 325         if (b > vc->vc_rows || t >= b || nr < 1)
 326                 return;
 327         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
 328                 return;
 329
 330         s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
 331         d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 332
 333         if (dir == SM_UP) {
 334                 clear = s + (b - t - nr) * vc->vc_cols;
 335                 swap(s, d);
 336         }
 337         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 338         scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
 339 }
 340
 341 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 342 {
 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 }
 384
 385 void update_region(struct vc_data *vc, unsigned long start, int count)
 386 {
 387         WARN_CONSOLE_UNLOCKED();
 388
 389         if (con_should_update(vc)) {
 390                 hide_cursor(vc);
 391                 do_update_region(vc, start, count);
 392                 set_cursor(vc);
 393         }
 394 }
 395
 396 /* Structure of attributes is hardware-dependent */
 397
 398 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 399     u8 _underline, u8 _reverse, u8 _italic)
 400 {
 401         if (vc->vc_sw->con_build_attr)
 402                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 403                        _blink, _underline, _reverse, _italic);
 404
 405 /*
 406  * ++roman: I completely changed the attribute format for monochrome
 407  * mode (!can_do_color). The formerly used MDA (monochrome display
 408  * adapter) format didn't allow the combination of certain effects.
 409  * Now the attribute is just a bit vector:
 410  *  Bit 0..1: intensity (0..2)
 411  *  Bit 2   : underline
 412  *  Bit 3   : reverse
 413  *  Bit 7   : blink
 414  */
 415         {
 416         u8 a = _color;
 417         if (!vc->vc_can_do_color)
 418                 return _intensity |
 419                        (_italic ? 2 : 0) |
 420                        (_underline ? 4 : 0) |
 421                        (_reverse ? 8 : 0) |
 422                        (_blink ? 0x80 : 0);
 423         if (_italic)
 424                 a = (a & 0xF0) | vc->vc_itcolor;
 425         else if (_underline)
 426                 a = (a & 0xf0) | vc->vc_ulcolor;
 427         else if (_intensity == 0)
 428                 a = (a & 0xf0) | vc->vc_ulcolor;
 429         if (_reverse)
 430                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 431         if (_blink)
 432                 a ^= 0x80;
 433         if (_intensity == 2)
 434                 a ^= 0x08;
 435         if (vc->vc_hi_font_mask == 0x100)
 436                 a <<= 1;
 437         return a;
 438         }
 439 }
 440
 441 static void update_attr(struct vc_data *vc)
 442 {
 443         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 444                       vc->vc_blink, vc->vc_underline,
 445                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 446         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 447 }
 448
 449 /* Note: inverting the screen twice should revert to the original state */
 450 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 451 {
 452         unsigned short *p;
 453
 454         WARN_CONSOLE_UNLOCKED();
 455
 456         count /= 2;
 457         p = screenpos(vc, offset, viewed);
 458         if (vc->vc_sw->con_invert_region) {
 459                 vc->vc_sw->con_invert_region(vc, p, count);
 460         } else {
 461                 u16 *q = p;
 462                 int cnt = count;
 463                 u16 a;
 464
 465                 if (!vc->vc_can_do_color) {
 466                         while (cnt--) {
 467                             a = scr_readw(q);
 468                             a ^= 0x0800;
 469                             scr_writew(a, q);
 470                             q++;
 471                         }
 472                 } else if (vc->vc_hi_font_mask == 0x100) {
 473                         while (cnt--) {
 474                                 a = scr_readw(q);
 475                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 476                                 scr_writew(a, q);
 477                                 q++;
 478                         }
 479                 } else {
 480                         while (cnt--) {
 481                                 a = scr_readw(q);
 482                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 483                                 scr_writew(a, q);
 484                                 q++;
 485                         }
 486                 }
 487         }
 488
 489         if (con_should_update(vc))
 490                 do_update_region(vc, (unsigned long) p, count);
 491         notify_update(vc);
 492 }
 493
 494 /* used by selection: complement pointer position */
 495 void complement_pos(struct vc_data *vc, int offset)
 496 {
 497         static int old_offset = -1;
 498         static unsigned short old;
 499         static unsigned short oldx, oldy;
 500
 501         WARN_CONSOLE_UNLOCKED();
 502
 503         if (old_offset != -1 && old_offset >= 0 &&
 504             old_offset < vc->vc_screenbuf_size) {
 505                 scr_writew(old, screenpos(vc, old_offset, 1));
 506                 if (con_should_update(vc))
 507                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 508                 notify_update(vc);
 509         }
 510
 511         old_offset = offset;
 512
 513         if (offset != -1 && offset >= 0 &&
 514             offset < vc->vc_screenbuf_size) {
 515                 unsigned short new;
 516                 unsigned short *p;
 517                 p = screenpos(vc, offset, 1);
 518                 old = scr_readw(p);
 519                 new = old ^ vc->vc_complement_mask;
 520                 scr_writew(new, p);
 521                 if (con_should_update(vc)) {
 522                         oldx = (offset >> 1) % vc->vc_cols;
 523                         oldy = (offset >> 1) / vc->vc_cols;
 524                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 525                 }
 526                 notify_update(vc);
 527         }
 528 }
 529
 530 static void insert_char(struct vc_data *vc, unsigned int nr)
 531 {
 532         unsigned short *p = (unsigned short *) vc->vc_pos;
 533
 534         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 535         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 536         vc->vc_need_wrap = 0;
 537         if (con_should_update(vc))
 538                 do_update_region(vc, (unsigned long) p,
 539                         vc->vc_cols - vc->vc_x);
 540 }
 541
 542 static void delete_char(struct vc_data *vc, unsigned int nr)
 543 {
 544         unsigned short *p = (unsigned short *) vc->vc_pos;
 545
 546         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 547         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 548                         nr * 2);
 549         vc->vc_need_wrap = 0;
 550         if (con_should_update(vc))
 551                 do_update_region(vc, (unsigned long) p,
 552                         vc->vc_cols - vc->vc_x);
 553 }
 554
 555 static int softcursor_original = -1;
 556
 557 static void add_softcursor(struct vc_data *vc)
 558 {
 559         int i = scr_readw((u16 *) vc->vc_pos);
 560         u32 type = vc->vc_cursor_type;
 561
 562         if (! (type & 0x10)) return;
 563         if (softcursor_original != -1) return;
 564         softcursor_original = i;
 565         i |= ((type >> 8) & 0xff00 );
 566         i ^= ((type) & 0xff00 );
 567         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 568         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 569         scr_writew(i, (u16 *) vc->vc_pos);
 570         if (con_should_update(vc))
 571                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 572 }
 573
 574 static void hide_softcursor(struct vc_data *vc)
 575 {
 576         if (softcursor_original != -1) {
 577                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 578                 if (con_should_update(vc))
 579                         vc->vc_sw->con_putc(vc, softcursor_original,
 580                                         vc->vc_y, vc->vc_x);
 581                 softcursor_original = -1;
 582         }
 583 }
 584
 585 static void hide_cursor(struct vc_data *vc)
 586 {
 587         if (vc == sel_cons)
 588                 clear_selection();
 589         vc->vc_sw->con_cursor(vc, CM_ERASE);
 590         hide_softcursor(vc);
 591 }
 592
 593 static void set_cursor(struct vc_data *vc)
 594 {
 595         if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
 596                 return;
 597         if (vc->vc_deccm) {
 598                 if (vc == sel_cons)
 599                         clear_selection();
 600                 add_softcursor(vc);
 601                 if ((vc->vc_cursor_type & 0x0f) != 1)
 602                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 603         } else
 604                 hide_cursor(vc);
 605 }
 606
 607 static void set_origin(struct vc_data *vc)
 608 {
 609         WARN_CONSOLE_UNLOCKED();
 610
 611         if (!con_is_visible(vc) ||
 612             !vc->vc_sw->con_set_origin ||
 613             !vc->vc_sw->con_set_origin(vc))
 614                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 615         vc->vc_visible_origin = vc->vc_origin;
 616         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 617         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 618 }
 619
 620 static void save_screen(struct vc_data *vc)
 621 {
 622         WARN_CONSOLE_UNLOCKED();
 623
 624         if (vc->vc_sw->con_save_screen)
 625                 vc->vc_sw->con_save_screen(vc);
 626 }
 627
 628 static void flush_scrollback(struct vc_data *vc)
 629 {
 630         WARN_CONSOLE_UNLOCKED();
 631
 632         if (vc->vc_sw->con_flush_scrollback)
 633                 vc->vc_sw->con_flush_scrollback(vc);
 634 }
 635
 636 /*
 637  *      Redrawing of screen
 638  */
 639
 640 void clear_buffer_attributes(struct vc_data *vc)
 641 {
 642         unsigned short *p = (unsigned short *)vc->vc_origin;
 643         int count = vc->vc_screenbuf_size / 2;
 644         int mask = vc->vc_hi_font_mask | 0xff;
 645
 646         for (; count > 0; count--, p++) {
 647                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 648         }
 649 }
 650
 651 void redraw_screen(struct vc_data *vc, int is_switch)
 652 {
 653         int redraw = 0;
 654
 655         WARN_CONSOLE_UNLOCKED();
 656
 657         if (!vc) {
 658                 /* strange ... */
 659                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 660                 return;
 661         }
 662
 663         if (is_switch) {
 664                 struct vc_data *old_vc = vc_cons[fg_console].d;
 665                 if (old_vc == vc)
 666                         return;
 667                 if (!con_is_visible(vc))
 668                         redraw = 1;
 669                 *vc->vc_display_fg = vc;
 670                 fg_console = vc->vc_num;
 671                 hide_cursor(old_vc);
 672                 if (!con_is_visible(old_vc)) {
 673                         save_screen(old_vc);
 674                         set_origin(old_vc);
 675                 }
 676                 if (tty0dev)
 677                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 678         } else {
 679                 hide_cursor(vc);
 680                 redraw = 1;
 681         }
 682
 683         if (redraw) {
 684                 int update;
 685                 int old_was_color = vc->vc_can_do_color;
 686
 687                 set_origin(vc);
 688                 update = vc->vc_sw->con_switch(vc);
 689                 set_palette(vc);
 690                 /*
 691                  * If console changed from mono<->color, the best we can do
 692                  * is to clear the buffer attributes. As it currently stands,
 693                  * rebuilding new attributes from the old buffer is not doable
 694                  * without overly complex code.
 695                  */
 696                 if (old_was_color != vc->vc_can_do_color) {
 697                         update_attr(vc);
 698                         clear_buffer_attributes(vc);
 699                 }
 700
 701                 /* Forcibly update if we're panicing */
 702                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 703                     vt_force_oops_output(vc))
 704                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 705         }
 706         set_cursor(vc);
 707         if (is_switch) {
 708                 set_leds();
 709                 compute_shiftstate();
 710                 notify_update(vc);
 711         }
 712 }
 713
 714 /*
 715  *      Allocation, freeing and resizing of VTs.
 716  */
 717
 718 int vc_cons_allocated(unsigned int i)
 719 {
 720         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 721 }
 722
 723 static void visual_init(struct vc_data *vc, int num, int init)
 724 {
 725         /* ++Geert: vc->vc_sw->con_init determines console size */
 726         if (vc->vc_sw)
 727                 module_put(vc->vc_sw->owner);
 728         vc->vc_sw = conswitchp;
 729 #ifndef VT_SINGLE_DRIVER
 730         if (con_driver_map[num])
 731                 vc->vc_sw = con_driver_map[num];
 732 #endif
 733         __module_get(vc->vc_sw->owner);
 734         vc->vc_num = num;
 735         vc->vc_display_fg = &master_display_fg;
 736         if (vc->vc_uni_pagedir_loc)
 737                 con_free_unimap(vc);
 738         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 739         vc->vc_uni_pagedir = NULL;
 740         vc->vc_hi_font_mask = 0;
 741         vc->vc_complement_mask = 0;
 742         vc->vc_can_do_color = 0;
 743         vc->vc_panic_force_write = false;
 744         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
 745         vc->vc_sw->con_init(vc, init);
 746         if (!vc->vc_complement_mask)
 747                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 748         vc->vc_s_complement_mask = vc->vc_complement_mask;
 749         vc->vc_size_row = vc->vc_cols << 1;
 750         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 751 }
 752
 753 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 754 {
 755         struct vt_notifier_param param;
 756         struct vc_data *vc;
 757
 758         WARN_CONSOLE_UNLOCKED();
 759
 760         if (currcons >= MAX_NR_CONSOLES)
 761                 return -ENXIO;
 762
 763         if (vc_cons[currcons].d)
 764                 return 0;
 765
 766         /* due to the granularity of kmalloc, we waste some memory here */
 767         /* the alloc is done in two steps, to optimize the common situation
 768            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 769         /* although the numbers above are not valid since long ago, the
 770            point is still up-to-date and the comment still has its value
 771            even if only as a historical artifact.  --mj, July 1998 */
 772         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 773         if (!vc)
 774                 return -ENOMEM;
 775
 776         vc_cons[currcons].d = vc;
 777         tty_port_init(&vc->port);
 778         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 779
 780         visual_init(vc, currcons, 1);
 781
 782         if (!*vc->vc_uni_pagedir_loc)
 783                 con_set_default_unimap(vc);
 784
 785         vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 786         if (!vc->vc_screenbuf)
 787                 goto err_free;
 788
 789         /* If no drivers have overridden us and the user didn't pass a
 790            boot option, default to displaying the cursor */
 791         if (global_cursor_default == -1)
 792                 global_cursor_default = 1;
 793
 794         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 795         vcs_make_sysfs(currcons);
 796         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 797
 798         return 0;
 799 err_free:
 800         kfree(vc);
 801         vc_cons[currcons].d = NULL;
 802         return -ENOMEM;
 803 }
 804
 805 static inline int resize_screen(struct vc_data *vc, int width, int height,
 806                                 int user)
 807 {
 808         /* Resizes the resolution of the display adapater */
 809         int err = 0;
 810
 811         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 812                 err = vc->vc_sw->con_resize(vc, width, height, user);
 813
 814         return err;
 815 }
 816
 817 /*
 818  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 819  * [this is to be used together with some user program
 820  * like resize that changes the hardware videomode]
 821  */
 822 #define VC_RESIZE_MAXCOL (32767)
 823 #define VC_RESIZE_MAXROW (32767)
 824
 825 /**
 826  *      vc_do_resize    -       resizing method for the tty
 827  *      @tty: tty being resized
 828  *      @real_tty: real tty (different to tty if a pty/tty pair)
 829  *      @vc: virtual console private data
 830  *      @cols: columns
 831  *      @lines: lines
 832  *
 833  *      Resize a virtual console, clipping according to the actual constraints.
 834  *      If the caller passes a tty structure then update the termios winsize
 835  *      information and perform any necessary signal handling.
 836  *
 837  *      Caller must hold the console semaphore. Takes the termios rwsem and
 838  *      ctrl_lock of the tty IFF a tty is passed.
 839  */
 840
 841 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 842                                 unsigned int cols, unsigned int lines)
 843 {
 844         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 845         unsigned long end;
 846         unsigned int old_rows, old_row_size;
 847         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 848         unsigned int user;
 849         unsigned short *newscreen;
 850
 851         WARN_CONSOLE_UNLOCKED();
 852
 853         if (!vc)
 854                 return -ENXIO;
 855
 856         user = vc->vc_resize_user;
 857         vc->vc_resize_user = 0;
 858
 859         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 860                 return -EINVAL;
 861
 862         new_cols = (cols ? cols : vc->vc_cols);
 863         new_rows = (lines ? lines : vc->vc_rows);
 864         new_row_size = new_cols << 1;
 865         new_screen_size = new_row_size * new_rows;
 866
 867         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 868                 return 0;
 869
 870         if (new_screen_size > (4 << 20))
 871                 return -EINVAL;
 872         newscreen = kmalloc(new_screen_size, GFP_USER);
 873         if (!newscreen)
 874                 return -ENOMEM;
 875
 876         if (vc == sel_cons)
 877                 clear_selection();
 878
 879         old_rows = vc->vc_rows;
 880         old_row_size = vc->vc_size_row;
 881
 882         err = resize_screen(vc, new_cols, new_rows, user);
 883         if (err) {
 884                 kfree(newscreen);
 885                 return err;
 886         }
 887
 888         vc->vc_rows = new_rows;
 889         vc->vc_cols = new_cols;
 890         vc->vc_size_row = new_row_size;
 891         vc->vc_screenbuf_size = new_screen_size;
 892
 893         rlth = min(old_row_size, new_row_size);
 894         rrem = new_row_size - rlth;
 895         old_origin = vc->vc_origin;
 896         new_origin = (long) newscreen;
 897         new_scr_end = new_origin + new_screen_size;
 898
 899         if (vc->vc_y > new_rows) {
 900                 if (old_rows - vc->vc_y < new_rows) {
 901                         /*
 902                          * Cursor near the bottom, copy contents from the
 903                          * bottom of buffer
 904                          */
 905                         old_origin += (old_rows - new_rows) * old_row_size;
 906                 } else {
 907                         /*
 908                          * Cursor is in no man's land, copy 1/2 screenful
 909                          * from the top and bottom of cursor position
 910                          */
 911                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 912                 }
 913         }
 914
 915         end = old_origin + old_row_size * min(old_rows, new_rows);
 916
 917         update_attr(vc);
 918
 919         while (old_origin < end) {
 920                 scr_memcpyw((unsigned short *) new_origin,
 921                             (unsigned short *) old_origin, rlth);
 922                 if (rrem)
 923                         scr_memsetw((void *)(new_origin + rlth),
 924                                     vc->vc_video_erase_char, rrem);
 925                 old_origin += old_row_size;
 926                 new_origin += new_row_size;
 927         }
 928         if (new_scr_end > new_origin)
 929                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 930                             new_scr_end - new_origin);
 931         kfree(vc->vc_screenbuf);
 932         vc->vc_screenbuf = newscreen;
 933         vc->vc_screenbuf_size = new_screen_size;
 934         set_origin(vc);
 935
 936         /* do part of a reset_terminal() */
 937         vc->vc_top = 0;
 938         vc->vc_bottom = vc->vc_rows;
 939         gotoxy(vc, vc->vc_x, vc->vc_y);
 940         save_cur(vc);
 941
 942         if (tty) {
 943                 /* Rewrite the requested winsize data with the actual
 944                    resulting sizes */
 945                 struct winsize ws;
 946                 memset(&ws, 0, sizeof(ws));
 947                 ws.ws_row = vc->vc_rows;
 948                 ws.ws_col = vc->vc_cols;
 949                 ws.ws_ypixel = vc->vc_scan_lines;
 950                 tty_do_resize(tty, &ws);
 951         }
 952
 953         if (con_is_visible(vc))
 954                 update_screen(vc);
 955         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 956         return err;
 957 }
 958
 959 /**
 960  *      vc_resize               -       resize a VT
 961  *      @vc: virtual console
 962  *      @cols: columns
 963  *      @rows: rows
 964  *
 965  *      Resize a virtual console as seen from the console end of things. We
 966  *      use the common vc_do_resize methods to update the structures. The
 967  *      caller must hold the console sem to protect console internals and
 968  *      vc->port.tty
 969  */
 970
 971 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 972 {
 973         return vc_do_resize(vc->port.tty, vc, cols, rows);
 974 }
 975
 976 /**
 977  *      vt_resize               -       resize a VT
 978  *      @tty: tty to resize
 979  *      @ws: winsize attributes
 980  *
 981  *      Resize a virtual terminal. This is called by the tty layer as we
 982  *      register our own handler for resizing. The mutual helper does all
 983  *      the actual work.
 984  *
 985  *      Takes the console sem and the called methods then take the tty
 986  *      termios_rwsem and the tty ctrl_lock in that order.
 987  */
 988 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 989 {
 990         struct vc_data *vc = tty->driver_data;
 991         int ret;
 992
 993         console_lock();
 994         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 995         console_unlock();
 996         return ret;
 997 }
 998
 999 struct vc_data *vc_deallocate(unsigned int currcons)
1000 {
1001         struct vc_data *vc = NULL;
1002
1003         WARN_CONSOLE_UNLOCKED();
1004
1005         if (vc_cons_allocated(currcons)) {
1006                 struct vt_notifier_param param;
1007
1008                 param.vc = vc = vc_cons[currcons].d;
1009                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1010                 vcs_remove_sysfs(currcons);
1011                 vc->vc_sw->con_deinit(vc);
1012                 put_pid(vc->vt_pid);
1013                 module_put(vc->vc_sw->owner);
1014                 kfree(vc->vc_screenbuf);
1015                 vc_cons[currcons].d = NULL;
1016         }
1017         return vc;
1018 }
1019
1020 /*
1021  *      VT102 emulator
1022  */
1023
1024 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1025 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1026 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1027
1028 #define decarm          VC_REPEAT
1029 #define decckm          VC_CKMODE
1030 #define kbdapplic       VC_APPLIC
1031 #define lnm             VC_CRLF
1032
1033 /*
1034  * this is what the terminal answers to a ESC-Z or csi0c query.
1035  */
1036 #define VT100ID "\033[?1;2c"
1037 #define VT102ID "\033[?6c"
1038
1039 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1040                                        8,12,10,14, 9,13,11,15 };
1041
1042 /* the default colour table, for VGA+ colour systems */
1043 unsigned char default_red[] = {
1044         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1045         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1046 };
1047 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1048
1049 unsigned char default_grn[] = {
1050         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1051         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1052 };
1053 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1054
1055 unsigned char default_blu[] = {
1056         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1057         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1058 };
1059 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1060
1061 /*
1062  * gotoxy() must verify all boundaries, because the arguments
1063  * might also be negative. If the given position is out of
1064  * bounds, the cursor is placed at the nearest margin.
1065  */
1066 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1067 {
1068         int min_y, max_y;
1069
1070         if (new_x < 0)
1071                 vc->vc_x = 0;
1072         else {
1073                 if (new_x >= vc->vc_cols)
1074                         vc->vc_x = vc->vc_cols - 1;
1075                 else
1076                         vc->vc_x = new_x;
1077         }
1078
1079         if (vc->vc_decom) {
1080                 min_y = vc->vc_top;
1081                 max_y = vc->vc_bottom;
1082         } else {
1083                 min_y = 0;
1084                 max_y = vc->vc_rows;
1085         }
1086         if (new_y < min_y)
1087                 vc->vc_y = min_y;
1088         else if (new_y >= max_y)
1089                 vc->vc_y = max_y - 1;
1090         else
1091                 vc->vc_y = new_y;
1092         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1093         vc->vc_need_wrap = 0;
1094 }
1095
1096 /* for absolute user moves, when decom is set */
1097 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1098 {
1099         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1100 }
1101
1102 void scrollback(struct vc_data *vc)
1103 {
1104         scrolldelta(-(vc->vc_rows / 2));
1105 }
1106
1107 void scrollfront(struct vc_data *vc, int lines)
1108 {
1109         if (!lines)
1110                 lines = vc->vc_rows / 2;
1111         scrolldelta(lines);
1112 }
1113
1114 static void lf(struct vc_data *vc)
1115 {
1116         /* don't scroll if above bottom of scrolling region, or
1117          * if below scrolling region
1118          */
1119         if (vc->vc_y + 1 == vc->vc_bottom)
1120                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1121         else if (vc->vc_y < vc->vc_rows - 1) {
1122                 vc->vc_y++;
1123                 vc->vc_pos += vc->vc_size_row;
1124         }
1125         vc->vc_need_wrap = 0;
1126         notify_write(vc, '\n');
1127 }
1128
1129 static void ri(struct vc_data *vc)
1130 {
1131         /* don't scroll if below top of scrolling region, or
1132          * if above scrolling region
1133          */
1134         if (vc->vc_y == vc->vc_top)
1135                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1136         else if (vc->vc_y > 0) {
1137                 vc->vc_y--;
1138                 vc->vc_pos -= vc->vc_size_row;
1139         }
1140         vc->vc_need_wrap = 0;
1141 }
1142
1143 static inline void cr(struct vc_data *vc)
1144 {
1145         vc->vc_pos -= vc->vc_x << 1;
1146         vc->vc_need_wrap = vc->vc_x = 0;
1147         notify_write(vc, '\r');
1148 }
1149
1150 static inline void bs(struct vc_data *vc)
1151 {
1152         if (vc->vc_x) {
1153                 vc->vc_pos -= 2;
1154                 vc->vc_x--;
1155                 vc->vc_need_wrap = 0;
1156                 notify_write(vc, '\b');
1157         }
1158 }
1159
1160 static inline void del(struct vc_data *vc)
1161 {
1162         /* ignored */
1163 }
1164
1165 static void csi_J(struct vc_data *vc, int vpar)
1166 {
1167         unsigned int count;
1168         unsigned short * start;
1169
1170         switch (vpar) {
1171                 case 0: /* erase from cursor to end of display */
1172                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1173                         start = (unsigned short *)vc->vc_pos;
1174                         break;
1175                 case 1: /* erase from start to cursor */
1176                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1177                         start = (unsigned short *)vc->vc_origin;
1178                         break;
1179                 case 3: /* erase scroll-back buffer (and whole display) */
1180                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1181                                     vc->vc_screenbuf_size);
1182                         flush_scrollback(vc);
1183                         set_origin(vc);
1184                         if (con_is_visible(vc))
1185                                 update_screen(vc);
1186                         /* fall through */
1187                 case 2: /* erase whole display */
1188                         count = vc->vc_cols * vc->vc_rows;
1189                         start = (unsigned short *)vc->vc_origin;
1190                         break;
1191                 default:
1192                         return;
1193         }
1194         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1195         if (con_should_update(vc))
1196                 do_update_region(vc, (unsigned long) start, count);
1197         vc->vc_need_wrap = 0;
1198 }
1199
1200 static void csi_K(struct vc_data *vc, int vpar)
1201 {
1202         unsigned int count;
1203         unsigned short * start;
1204
1205         switch (vpar) {
1206                 case 0: /* erase from cursor to end of line */
1207                         count = vc->vc_cols - vc->vc_x;
1208                         start = (unsigned short *)vc->vc_pos;
1209                         break;
1210                 case 1: /* erase from start of line to cursor */
1211                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1212                         count = vc->vc_x + 1;
1213                         break;
1214                 case 2: /* erase whole line */
1215                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216                         count = vc->vc_cols;
1217                         break;
1218                 default:
1219                         return;
1220         }
1221         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1222         vc->vc_need_wrap = 0;
1223         if (con_should_update(vc))
1224                 do_update_region(vc, (unsigned long) start, count);
1225 }
1226
1227 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1228 {                                         /* not vt100? */
1229         int count;
1230
1231         if (!vpar)
1232                 vpar++;
1233         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1234
1235         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1236         if (con_should_update(vc))
1237                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1238         vc->vc_need_wrap = 0;
1239 }
1240
1241 static void default_attr(struct vc_data *vc)
1242 {
1243         vc->vc_intensity = 1;
1244         vc->vc_italic = 0;
1245         vc->vc_underline = 0;
1246         vc->vc_reverse = 0;
1247         vc->vc_blink = 0;
1248         vc->vc_color = vc->vc_def_color;
1249 }
1250
1251 struct rgb { u8 r; u8 g; u8 b; };
1252
1253 static void rgb_from_256(int i, struct rgb *c)
1254 {
1255         if (i < 8) {            /* Standard colours. */
1256                 c->r = i&1 ? 0xaa : 0x00;
1257                 c->g = i&2 ? 0xaa : 0x00;
1258                 c->b = i&4 ? 0xaa : 0x00;
1259         } else if (i < 16) {
1260                 c->r = i&1 ? 0xff : 0x55;
1261                 c->g = i&2 ? 0xff : 0x55;
1262                 c->b = i&4 ? 0xff : 0x55;
1263         } else if (i < 232) {   /* 6x6x6 colour cube. */
1264                 c->r = (i - 16) / 36 * 85 / 2;
1265                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1266                 c->b = (i - 16) % 6 * 85 / 2;
1267         } else                  /* Grayscale ramp. */
1268                 c->r = c->g = c->b = i * 10 - 2312;
1269 }
1270
1271 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1272 {
1273         u8 hue = 0, max = max3(c->r, c->g, c->b);
1274
1275         if (c->r > max / 2)
1276                 hue |= 4;
1277         if (c->g > max / 2)
1278                 hue |= 2;
1279         if (c->b > max / 2)
1280                 hue |= 1;
1281
1282         if (hue == 7 && max <= 0x55) {
1283                 hue = 0;
1284                 vc->vc_intensity = 2;
1285         } else if (max > 0xaa)
1286                 vc->vc_intensity = 2;
1287         else
1288                 vc->vc_intensity = 1;
1289
1290         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1291 }
1292
1293 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1294 {
1295         /* For backgrounds, err on the dark side. */
1296         vc->vc_color = (vc->vc_color & 0x0f)
1297                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1298 }
1299
1300 /*
1301  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1302  * and thus need to be detected and ignored by hand. Strictly speaking, that
1303  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1304  * no one produces such codes and almost no one accepts them.
1305  *
1306  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1307  * supporting them.
1308  */
1309 static int vc_t416_color(struct vc_data *vc, int i,
1310                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1311 {
1312         struct rgb c;
1313
1314         i++;
1315         if (i > vc->vc_npar)
1316                 return i;
1317
1318         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1319                 /* 256 colours */
1320                 i++;
1321                 rgb_from_256(vc->vc_par[i], &c);
1322         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1323                 /* 24 bit */
1324                 c.r = vc->vc_par[i + 1];
1325                 c.g = vc->vc_par[i + 2];
1326                 c.b = vc->vc_par[i + 3];
1327                 i += 3;
1328         } else
1329                 return i;
1330
1331         set_color(vc, &c);
1332
1333         return i;
1334 }
1335
1336 /* console_lock is held */
1337 static void csi_m(struct vc_data *vc)
1338 {
1339         int i;
1340
1341         for (i = 0; i <= vc->vc_npar; i++)
1342                 switch (vc->vc_par[i]) {
1343                 case 0: /* all attributes off */
1344                         default_attr(vc);
1345                         break;
1346                 case 1:
1347                         vc->vc_intensity = 2;
1348                         break;
1349                 case 2:
1350                         vc->vc_intensity = 0;
1351                         break;
1352                 case 3:
1353                         vc->vc_italic = 1;
1354                         break;
1355                 case 4:
1356                         vc->vc_underline = 1;
1357                         break;
1358                 case 5:
1359                         vc->vc_blink = 1;
1360                         break;
1361                 case 7:
1362                         vc->vc_reverse = 1;
1363                         break;
1364                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1365                           * Select primary font, don't display control chars if
1366                           * defined, don't set bit 8 on output.
1367                           */
1368                         vc->vc_translate = set_translate(vc->vc_charset == 0
1369                                         ? vc->vc_G0_charset
1370                                         : vc->vc_G1_charset, vc);
1371                         vc->vc_disp_ctrl = 0;
1372                         vc->vc_toggle_meta = 0;
1373                         break;
1374                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1375                           * Select first alternate font, lets chars < 32 be
1376                           * displayed as ROM chars.
1377                           */
1378                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1379                         vc->vc_disp_ctrl = 1;
1380                         vc->vc_toggle_meta = 0;
1381                         break;
1382                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1383                           * Select second alternate font, toggle high bit
1384                           * before displaying as ROM char.
1385                           */
1386                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1387                         vc->vc_disp_ctrl = 1;
1388                         vc->vc_toggle_meta = 1;
1389                         break;
1390                 case 21:
1391                 case 22:
1392                         vc->vc_intensity = 1;
1393                         break;
1394                 case 23:
1395                         vc->vc_italic = 0;
1396                         break;
1397                 case 24:
1398                         vc->vc_underline = 0;
1399                         break;
1400                 case 25:
1401                         vc->vc_blink = 0;
1402                         break;
1403                 case 27:
1404                         vc->vc_reverse = 0;
1405                         break;
1406                 case 38:
1407                         i = vc_t416_color(vc, i, rgb_foreground);
1408                         break;
1409                 case 48:
1410                         i = vc_t416_color(vc, i, rgb_background);
1411                         break;
1412                 case 39:
1413                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1414                                 (vc->vc_color & 0xf0);
1415                         break;
1416                 case 49:
1417                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1418                                 (vc->vc_color & 0x0f);
1419                         break;
1420                 default:
1421                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1422                                 if (vc->vc_par[i] < 100)
1423                                         vc->vc_intensity = 2;
1424                                 vc->vc_par[i] -= 60;
1425                         }
1426                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1427                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1428                                         | (vc->vc_color & 0xf0);
1429                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1430                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1431                                         | (vc->vc_color & 0x0f);
1432                         break;
1433                 }
1434         update_attr(vc);
1435 }
1436
1437 static void respond_string(const char *p, struct tty_port *port)
1438 {
1439         while (*p) {
1440                 tty_insert_flip_char(port, *p, 0);
1441                 p++;
1442         }
1443         tty_schedule_flip(port);
1444 }
1445
1446 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1447 {
1448         char buf[40];
1449
1450         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1451         respond_string(buf, tty->port);
1452 }
1453
1454 static inline void status_report(struct tty_struct *tty)
1455 {
1456         respond_string("\033[0n", tty->port);   /* Terminal ok */
1457 }
1458
1459 static inline void respond_ID(struct tty_struct *tty)
1460 {
1461         respond_string(VT102ID, tty->port);
1462 }
1463
1464 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1465 {
1466         char buf[8];
1467
1468         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1469                 (char)('!' + mry));
1470         respond_string(buf, tty->port);
1471 }
1472
1473 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1474 int mouse_reporting(void)
1475 {
1476         return vc_cons[fg_console].d->vc_report_mouse;
1477 }
1478
1479 /* console_lock is held */
1480 static void set_mode(struct vc_data *vc, int on_off)
1481 {
1482         int i;
1483
1484         for (i = 0; i <= vc->vc_npar; i++)
1485                 if (vc->vc_ques) {
1486                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1487                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1488                                 if (on_off)
1489                                         set_kbd(vc, decckm);
1490                                 else
1491                                         clr_kbd(vc, decckm);
1492                                 break;
1493                         case 3: /* 80/132 mode switch unimplemented */
1494 #if 0
1495                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1496                                 /* this alone does not suffice; some user mode
1497                                    utility has to change the hardware regs */
1498 #endif
1499                                 break;
1500                         case 5:                 /* Inverted screen on/off */
1501                                 if (vc->vc_decscnm != on_off) {
1502                                         vc->vc_decscnm = on_off;
1503                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1504                                         update_attr(vc);
1505                                 }
1506                                 break;
1507                         case 6:                 /* Origin relative/absolute */
1508                                 vc->vc_decom = on_off;
1509                                 gotoxay(vc, 0, 0);
1510                                 break;
1511                         case 7:                 /* Autowrap on/off */
1512                                 vc->vc_decawm = on_off;
1513                                 break;
1514                         case 8:                 /* Autorepeat on/off */
1515                                 if (on_off)
1516                                         set_kbd(vc, decarm);
1517                                 else
1518                                         clr_kbd(vc, decarm);
1519                                 break;
1520                         case 9:
1521                                 vc->vc_report_mouse = on_off ? 1 : 0;
1522                                 break;
1523                         case 25:                /* Cursor on/off */
1524                                 vc->vc_deccm = on_off;
1525                                 break;
1526                         case 1000:
1527                                 vc->vc_report_mouse = on_off ? 2 : 0;
1528                                 break;
1529                         }
1530                 } else {
1531                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1532                         case 3:                 /* Monitor (display ctrls) */
1533                                 vc->vc_disp_ctrl = on_off;
1534                                 break;
1535                         case 4:                 /* Insert Mode on/off */
1536                                 vc->vc_decim = on_off;
1537                                 break;
1538                         case 20:                /* Lf, Enter == CrLf/Lf */
1539                                 if (on_off)
1540                                         set_kbd(vc, lnm);
1541                                 else
1542                                         clr_kbd(vc, lnm);
1543                                 break;
1544                         }
1545                 }
1546 }
1547
1548 /* console_lock is held */
1549 static void setterm_command(struct vc_data *vc)
1550 {
1551         switch(vc->vc_par[0]) {
1552                 case 1: /* set color for underline mode */
1553                         if (vc->vc_can_do_color &&
1554                                         vc->vc_par[1] < 16) {
1555                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1556                                 if (vc->vc_underline)
1557                                         update_attr(vc);
1558                         }
1559                         break;
1560                 case 2: /* set color for half intensity mode */
1561                         if (vc->vc_can_do_color &&
1562                                         vc->vc_par[1] < 16) {
1563                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1564                                 if (vc->vc_intensity == 0)
1565                                         update_attr(vc);
1566                         }
1567                         break;
1568                 case 8: /* store colors as defaults */
1569                         vc->vc_def_color = vc->vc_attr;
1570                         if (vc->vc_hi_font_mask == 0x100)
1571                                 vc->vc_def_color >>= 1;
1572                         default_attr(vc);
1573                         update_attr(vc);
1574                         break;
1575                 case 9: /* set blanking interval */
1576                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1577                         poke_blanked_console();
1578                         break;
1579                 case 10: /* set bell frequency in Hz */
1580                         if (vc->vc_npar >= 1)
1581                                 vc->vc_bell_pitch = vc->vc_par[1];
1582                         else
1583                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1584                         break;
1585                 case 11: /* set bell duration in msec */
1586                         if (vc->vc_npar >= 1)
1587                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1588                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1589                         else
1590                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1591                         break;
1592                 case 12: /* bring specified console to the front */
1593                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1594                                 set_console(vc->vc_par[1] - 1);
1595                         break;
1596                 case 13: /* unblank the screen */
1597                         poke_blanked_console();
1598                         break;
1599                 case 14: /* set vesa powerdown interval */
1600                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1601                         break;
1602                 case 15: /* activate the previous console */
1603                         set_console(last_console);
1604                         break;
1605                 case 16: /* set cursor blink duration in msec */
1606                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1607                                         vc->vc_par[1] <= USHRT_MAX)
1608                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1609                         else
1610                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1611                         break;
1612         }
1613 }
1614
1615 /* console_lock is held */
1616 static void csi_at(struct vc_data *vc, unsigned int nr)
1617 {
1618         if (nr > vc->vc_cols - vc->vc_x)
1619                 nr = vc->vc_cols - vc->vc_x;
1620         else if (!nr)
1621                 nr = 1;
1622         insert_char(vc, nr);
1623 }
1624
1625 /* console_lock is held */
1626 static void csi_L(struct vc_data *vc, unsigned int nr)
1627 {
1628         if (nr > vc->vc_rows - vc->vc_y)
1629                 nr = vc->vc_rows - vc->vc_y;
1630         else if (!nr)
1631                 nr = 1;
1632         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1633         vc->vc_need_wrap = 0;
1634 }
1635
1636 /* console_lock is held */
1637 static void csi_P(struct vc_data *vc, unsigned int nr)
1638 {
1639         if (nr > vc->vc_cols - vc->vc_x)
1640                 nr = vc->vc_cols - vc->vc_x;
1641         else if (!nr)
1642                 nr = 1;
1643         delete_char(vc, nr);
1644 }
1645
1646 /* console_lock is held */
1647 static void csi_M(struct vc_data *vc, unsigned int nr)
1648 {
1649         if (nr > vc->vc_rows - vc->vc_y)
1650                 nr = vc->vc_rows - vc->vc_y;
1651         else if (!nr)
1652                 nr=1;
1653         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1654         vc->vc_need_wrap = 0;
1655 }
1656
1657 /* console_lock is held (except via vc_init->reset_terminal */
1658 static void save_cur(struct vc_data *vc)
1659 {
1660         vc->vc_saved_x          = vc->vc_x;
1661         vc->vc_saved_y          = vc->vc_y;
1662         vc->vc_s_intensity      = vc->vc_intensity;
1663         vc->vc_s_italic         = vc->vc_italic;
1664         vc->vc_s_underline      = vc->vc_underline;
1665         vc->vc_s_blink          = vc->vc_blink;
1666         vc->vc_s_reverse        = vc->vc_reverse;
1667         vc->vc_s_charset        = vc->vc_charset;
1668         vc->vc_s_color          = vc->vc_color;
1669         vc->vc_saved_G0         = vc->vc_G0_charset;
1670         vc->vc_saved_G1         = vc->vc_G1_charset;
1671 }
1672
1673 /* console_lock is held */
1674 static void restore_cur(struct vc_data *vc)
1675 {
1676         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1677         vc->vc_intensity        = vc->vc_s_intensity;
1678         vc->vc_italic           = vc->vc_s_italic;
1679         vc->vc_underline        = vc->vc_s_underline;
1680         vc->vc_blink            = vc->vc_s_blink;
1681         vc->vc_reverse          = vc->vc_s_reverse;
1682         vc->vc_charset          = vc->vc_s_charset;
1683         vc->vc_color            = vc->vc_s_color;
1684         vc->vc_G0_charset       = vc->vc_saved_G0;
1685         vc->vc_G1_charset       = vc->vc_saved_G1;
1686         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1687         update_attr(vc);
1688         vc->vc_need_wrap = 0;
1689 }
1690
1691 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1692         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1693         ESpalette, ESosc };
1694
1695 /* console_lock is held (except via vc_init()) */
1696 static void reset_terminal(struct vc_data *vc, int do_clear)
1697 {
1698         vc->vc_top              = 0;
1699         vc->vc_bottom           = vc->vc_rows;
1700         vc->vc_state            = ESnormal;
1701         vc->vc_ques             = 0;
1702         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1703         vc->vc_G0_charset       = LAT1_MAP;
1704         vc->vc_G1_charset       = GRAF_MAP;
1705         vc->vc_charset          = 0;
1706         vc->vc_need_wrap        = 0;
1707         vc->vc_report_mouse     = 0;
1708         vc->vc_utf              = default_utf8;
1709         vc->vc_utf_count        = 0;
1710
1711         vc->vc_disp_ctrl        = 0;
1712         vc->vc_toggle_meta      = 0;
1713
1714         vc->vc_decscnm          = 0;
1715         vc->vc_decom            = 0;
1716         vc->vc_decawm           = 1;
1717         vc->vc_deccm            = global_cursor_default;
1718         vc->vc_decim            = 0;
1719
1720         vt_reset_keyboard(vc->vc_num);
1721
1722         vc->vc_cursor_type = cur_default;
1723         vc->vc_complement_mask = vc->vc_s_complement_mask;
1724
1725         default_attr(vc);
1726         update_attr(vc);
1727
1728         vc->vc_tab_stop[0]      = 0x01010100;
1729         vc->vc_tab_stop[1]      =
1730         vc->vc_tab_stop[2]      =
1731         vc->vc_tab_stop[3]      =
1732         vc->vc_tab_stop[4]      =
1733         vc->vc_tab_stop[5]      =
1734         vc->vc_tab_stop[6]      =
1735         vc->vc_tab_stop[7]      = 0x01010101;
1736
1737         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1738         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1739         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1740
1741         gotoxy(vc, 0, 0);
1742         save_cur(vc);
1743         if (do_clear)
1744             csi_J(vc, 2);
1745 }
1746
1747 /* console_lock is held */
1748 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1749 {
1750         /*
1751          *  Control characters can be used in the _middle_
1752          *  of an escape sequence.
1753          */
1754         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1755                 return;
1756         switch (c) {
1757         case 0:
1758                 return;
1759         case 7:
1760                 if (vc->vc_state == ESosc)
1761                         vc->vc_state = ESnormal;
1762                 else if (vc->vc_bell_duration)
1763                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1764                 return;
1765         case 8:
1766                 bs(vc);
1767                 return;
1768         case 9:
1769                 vc->vc_pos -= (vc->vc_x << 1);
1770                 while (vc->vc_x < vc->vc_cols - 1) {
1771                         vc->vc_x++;
1772                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1773                                 break;
1774                 }
1775                 vc->vc_pos += (vc->vc_x << 1);
1776                 notify_write(vc, '\t');
1777                 return;
1778         case 10: case 11: case 12:
1779                 lf(vc);
1780                 if (!is_kbd(vc, lnm))
1781                         return;
1782         case 13:
1783                 cr(vc);
1784                 return;
1785         case 14:
1786                 vc->vc_charset = 1;
1787                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1788                 vc->vc_disp_ctrl = 1;
1789                 return;
1790         case 15:
1791                 vc->vc_charset = 0;
1792                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1793                 vc->vc_disp_ctrl = 0;
1794                 return;
1795         case 24: case 26:
1796                 vc->vc_state = ESnormal;
1797                 return;
1798         case 27:
1799                 vc->vc_state = ESesc;
1800                 return;
1801         case 127:
1802                 del(vc);
1803                 return;
1804         case 128+27:
1805                 vc->vc_state = ESsquare;
1806                 return;
1807         }
1808         switch(vc->vc_state) {
1809         case ESesc:
1810                 vc->vc_state = ESnormal;
1811                 switch (c) {
1812                 case '[':
1813                         vc->vc_state = ESsquare;
1814                         return;
1815                 case ']':
1816                         vc->vc_state = ESnonstd;
1817                         return;
1818                 case '%':
1819                         vc->vc_state = ESpercent;
1820                         return;
1821                 case 'E':
1822                         cr(vc);
1823                         lf(vc);
1824                         return;
1825                 case 'M':
1826                         ri(vc);
1827                         return;
1828                 case 'D':
1829                         lf(vc);
1830                         return;
1831                 case 'H':
1832                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1833                         return;
1834                 case 'Z':
1835                         respond_ID(tty);
1836                         return;
1837                 case '7':
1838                         save_cur(vc);
1839                         return;
1840                 case '8':
1841                         restore_cur(vc);
1842                         return;
1843                 case '(':
1844                         vc->vc_state = ESsetG0;
1845                         return;
1846                 case ')':
1847                         vc->vc_state = ESsetG1;
1848                         return;
1849                 case '#':
1850                         vc->vc_state = EShash;
1851                         return;
1852                 case 'c':
1853                         reset_terminal(vc, 1);
1854                         return;
1855                 case '>':  /* Numeric keypad */
1856                         clr_kbd(vc, kbdapplic);
1857                         return;
1858                 case '=':  /* Appl. keypad */
1859                         set_kbd(vc, kbdapplic);
1860                         return;
1861                 }
1862                 return;
1863         case ESnonstd:
1864                 if (c=='P') {   /* palette escape sequence */
1865                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1866                                 vc->vc_par[vc->vc_npar] = 0;
1867                         vc->vc_npar = 0;
1868                         vc->vc_state = ESpalette;
1869                         return;
1870                 } else if (c=='R') {   /* reset palette */
1871                         reset_palette(vc);
1872                         vc->vc_state = ESnormal;
1873                 } else if (c>='0' && c<='9')
1874                         vc->vc_state = ESosc;
1875                 else
1876                         vc->vc_state = ESnormal;
1877                 return;
1878         case ESpalette:
1879                 if (isxdigit(c)) {
1880                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1881                         if (vc->vc_npar == 7) {
1882                                 int i = vc->vc_par[0] * 3, j = 1;
1883                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1884                                 vc->vc_palette[i++] += vc->vc_par[j++];
1885                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1886                                 vc->vc_palette[i++] += vc->vc_par[j++];
1887                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1888                                 vc->vc_palette[i] += vc->vc_par[j];
1889                                 set_palette(vc);
1890                                 vc->vc_state = ESnormal;
1891                         }
1892                 } else
1893                         vc->vc_state = ESnormal;
1894                 return;
1895         case ESsquare:
1896                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1897                         vc->vc_par[vc->vc_npar] = 0;
1898                 vc->vc_npar = 0;
1899                 vc->vc_state = ESgetpars;
1900                 if (c == '[') { /* Function key */
1901                         vc->vc_state=ESfunckey;
1902                         return;
1903                 }
1904                 vc->vc_ques = (c == '?');
1905                 if (vc->vc_ques)
1906                         return;
1907         case ESgetpars:
1908                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1909                         vc->vc_npar++;
1910                         return;
1911                 } else if (c>='0' && c<='9') {
1912                         vc->vc_par[vc->vc_npar] *= 10;
1913                         vc->vc_par[vc->vc_npar] += c - '0';
1914                         return;
1915                 }
1916                 vc->vc_state = ESnormal;
1917                 switch(c) {
1918                 case 'h':
1919                         set_mode(vc, 1);
1920                         return;
1921                 case 'l':
1922                         set_mode(vc, 0);
1923                         return;
1924                 case 'c':
1925                         if (vc->vc_ques) {
1926                                 if (vc->vc_par[0])
1927                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1928                                 else
1929                                         vc->vc_cursor_type = cur_default;
1930                                 return;
1931                         }
1932                         break;
1933                 case 'm':
1934                         if (vc->vc_ques) {
1935                                 clear_selection();
1936                                 if (vc->vc_par[0])
1937                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1938                                 else
1939                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1940                                 return;
1941                         }
1942                         break;
1943                 case 'n':
1944                         if (!vc->vc_ques) {
1945                                 if (vc->vc_par[0] == 5)
1946                                         status_report(tty);
1947                                 else if (vc->vc_par[0] == 6)
1948                                         cursor_report(vc, tty);
1949                         }
1950                         return;
1951                 }
1952                 if (vc->vc_ques) {
1953                         vc->vc_ques = 0;
1954                         return;
1955                 }
1956                 switch(c) {
1957                 case 'G': case '`':
1958                         if (vc->vc_par[0])
1959                                 vc->vc_par[0]--;
1960                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1961                         return;
1962                 case 'A':
1963                         if (!vc->vc_par[0])
1964                                 vc->vc_par[0]++;
1965                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1966                         return;
1967                 case 'B': case 'e':
1968                         if (!vc->vc_par[0])
1969                                 vc->vc_par[0]++;
1970                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1971                         return;
1972                 case 'C': case 'a':
1973                         if (!vc->vc_par[0])
1974                                 vc->vc_par[0]++;
1975                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1976                         return;
1977                 case 'D':
1978                         if (!vc->vc_par[0])
1979                                 vc->vc_par[0]++;
1980                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1981                         return;
1982                 case 'E':
1983                         if (!vc->vc_par[0])
1984                                 vc->vc_par[0]++;
1985                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1986                         return;
1987                 case 'F':
1988                         if (!vc->vc_par[0])
1989                                 vc->vc_par[0]++;
1990                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1991                         return;
1992                 case 'd':
1993                         if (vc->vc_par[0])
1994                                 vc->vc_par[0]--;
1995                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1996                         return;
1997                 case 'H': case 'f':
1998                         if (vc->vc_par[0])
1999                                 vc->vc_par[0]--;
2000                         if (vc->vc_par[1])
2001                                 vc->vc_par[1]--;
2002                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2003                         return;
2004                 case 'J':
2005                         csi_J(vc, vc->vc_par[0]);
2006                         return;
2007                 case 'K':
2008                         csi_K(vc, vc->vc_par[0]);
2009                         return;
2010                 case 'L':
2011                         csi_L(vc, vc->vc_par[0]);
2012                         return;
2013                 case 'M':
2014                         csi_M(vc, vc->vc_par[0]);
2015                         return;
2016                 case 'P':
2017                         csi_P(vc, vc->vc_par[0]);
2018                         return;
2019                 case 'c':
2020                         if (!vc->vc_par[0])
2021                                 respond_ID(tty);
2022                         return;
2023                 case 'g':
2024                         if (!vc->vc_par[0])
2025                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2026                         else if (vc->vc_par[0] == 3) {
2027                                 vc->vc_tab_stop[0] =
2028                                         vc->vc_tab_stop[1] =
2029                                         vc->vc_tab_stop[2] =
2030                                         vc->vc_tab_stop[3] =
2031                                         vc->vc_tab_stop[4] =
2032                                         vc->vc_tab_stop[5] =
2033                                         vc->vc_tab_stop[6] =
2034                                         vc->vc_tab_stop[7] = 0;
2035                         }
2036                         return;
2037                 case 'm':
2038                         csi_m(vc);
2039                         return;
2040                 case 'q': /* DECLL - but only 3 leds */
2041                         /* map 0,1,2,3 to 0,1,2,4 */
2042                         if (vc->vc_par[0] < 4)
2043                                 vt_set_led_state(vc->vc_num,
2044                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2045                         return;
2046                 case 'r':
2047                         if (!vc->vc_par[0])
2048                                 vc->vc_par[0]++;
2049                         if (!vc->vc_par[1])
2050                                 vc->vc_par[1] = vc->vc_rows;
2051                         /* Minimum allowed region is 2 lines */
2052                         if (vc->vc_par[0] < vc->vc_par[1] &&
2053                             vc->vc_par[1] <= vc->vc_rows) {
2054                                 vc->vc_top = vc->vc_par[0] - 1;
2055                                 vc->vc_bottom = vc->vc_par[1];
2056                                 gotoxay(vc, 0, 0);
2057                         }
2058                         return;
2059                 case 's':
2060                         save_cur(vc);
2061                         return;
2062                 case 'u':
2063                         restore_cur(vc);
2064                         return;
2065                 case 'X':
2066                         csi_X(vc, vc->vc_par[0]);
2067                         return;
2068                 case '@':
2069                         csi_at(vc, vc->vc_par[0]);
2070                         return;
2071                 case ']': /* setterm functions */
2072                         setterm_command(vc);
2073                         return;
2074                 }
2075                 return;
2076         case ESpercent:
2077                 vc->vc_state = ESnormal;
2078                 switch (c) {
2079                 case '@':  /* defined in ISO 2022 */
2080                         vc->vc_utf = 0;
2081                         return;
2082                 case 'G':  /* prelim official escape code */
2083                 case '8':  /* retained for compatibility */
2084                         vc->vc_utf = 1;
2085                         return;
2086                 }
2087                 return;
2088         case ESfunckey:
2089                 vc->vc_state = ESnormal;
2090                 return;
2091         case EShash:
2092                 vc->vc_state = ESnormal;
2093                 if (c == '8') {
2094                         /* DEC screen alignment test. kludge :-) */
2095                         vc->vc_video_erase_char =
2096                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2097                         csi_J(vc, 2);
2098                         vc->vc_video_erase_char =
2099                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2100                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2101                 }
2102                 return;
2103         case ESsetG0:
2104                 if (c == '0')
2105                         vc->vc_G0_charset = GRAF_MAP;
2106                 else if (c == 'B')
2107                         vc->vc_G0_charset = LAT1_MAP;
2108                 else if (c == 'U')
2109                         vc->vc_G0_charset = IBMPC_MAP;
2110                 else if (c == 'K')
2111                         vc->vc_G0_charset = USER_MAP;
2112                 if (vc->vc_charset == 0)
2113                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2114                 vc->vc_state = ESnormal;
2115                 return;
2116         case ESsetG1:
2117                 if (c == '0')
2118                         vc->vc_G1_charset = GRAF_MAP;
2119                 else if (c == 'B')
2120                         vc->vc_G1_charset = LAT1_MAP;
2121                 else if (c == 'U')
2122                         vc->vc_G1_charset = IBMPC_MAP;
2123                 else if (c == 'K')
2124                         vc->vc_G1_charset = USER_MAP;
2125                 if (vc->vc_charset == 1)
2126                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2127                 vc->vc_state = ESnormal;
2128                 return;
2129         case ESosc:
2130                 return;
2131         default:
2132                 vc->vc_state = ESnormal;
2133         }
2134 }
2135
2136 /* is_double_width() is based on the wcwidth() implementation by
2137  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2138  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2139  */
2140 struct interval {
2141         uint32_t first;
2142         uint32_t last;
2143 };
2144
2145 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2146 {
2147         int min = 0;
2148         int mid;
2149
2150         if (ucs < table[0].first || ucs > table[max].last)
2151                 return 0;
2152         while (max >= min) {
2153                 mid = (min + max) / 2;
2154                 if (ucs > table[mid].last)
2155                         min = mid + 1;
2156                 else if (ucs < table[mid].first)
2157                         max = mid - 1;
2158                 else
2159                         return 1;
2160         }
2161         return 0;
2162 }
2163
2164 static int is_double_width(uint32_t ucs)
2165 {
2166         static const struct interval double_width[] = {
2167                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2168                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2169                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2170                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2171         };
2172         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2173 }
2174
2175 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2176                 unsigned long draw_to, int *draw_x)
2177 {
2178         if (*draw_x < 0)
2179                 return;
2180
2181         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2182                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2183         *draw_x = -1;
2184 }
2185
2186 /* acquires console_lock */
2187 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2188 {
2189         int c, tc, ok, n = 0, draw_x = -1;
2190         unsigned int currcons;
2191         unsigned long draw_from = 0, draw_to = 0;
2192         struct vc_data *vc;
2193         unsigned char vc_attr;
2194         struct vt_notifier_param param;
2195         uint8_t rescan;
2196         uint8_t inverse;
2197         uint8_t width;
2198         u16 himask, charmask;
2199
2200         if (in_interrupt())
2201                 return count;
2202
2203         might_sleep();
2204
2205         console_lock();
2206         vc = tty->driver_data;
2207         if (vc == NULL) {
2208                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2209                 console_unlock();
2210                 return 0;
2211         }
2212
2213         currcons = vc->vc_num;
2214         if (!vc_cons_allocated(currcons)) {
2215                 /* could this happen? */
2216                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2217                 console_unlock();
2218                 return 0;
2219         }
2220
2221         himask = vc->vc_hi_font_mask;
2222         charmask = himask ? 0x1ff : 0xff;
2223
2224         /* undraw cursor first */
2225         if (con_is_fg(vc))
2226                 hide_cursor(vc);
2227
2228         param.vc = vc;
2229
2230         while (!tty->stopped && count) {
2231                 int orig = *buf;
2232                 c = orig;
2233                 buf++;
2234                 n++;
2235                 count--;
2236                 rescan = 0;
2237                 inverse = 0;
2238                 width = 1;
2239
2240                 /* Do no translation at all in control states */
2241                 if (vc->vc_state != ESnormal) {
2242                         tc = c;
2243                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2244                     /* Combine UTF-8 into Unicode in vc_utf_char.
2245                      * vc_utf_count is the number of continuation bytes still
2246                      * expected to arrive.
2247                      * vc_npar is the number of continuation bytes arrived so
2248                      * far
2249                      */
2250 rescan_last_byte:
2251                     if ((c & 0xc0) == 0x80) {
2252                         /* Continuation byte received */
2253                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2254                         if (vc->vc_utf_count) {
2255                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2256                             vc->vc_npar++;
2257                             if (--vc->vc_utf_count) {
2258                                 /* Still need some bytes */
2259                                 continue;
2260                             }
2261                             /* Got a whole character */
2262                             c = vc->vc_utf_char;
2263                             /* Reject overlong sequences */
2264                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2265                                         c > utf8_length_changes[vc->vc_npar])
2266                                 c = 0xfffd;
2267                         } else {
2268                             /* Unexpected continuation byte */
2269                             vc->vc_utf_count = 0;
2270                             c = 0xfffd;
2271                         }
2272                     } else {
2273                         /* Single ASCII byte or first byte of a sequence received */
2274                         if (vc->vc_utf_count) {
2275                             /* Continuation byte expected */
2276                             rescan = 1;
2277                             vc->vc_utf_count = 0;
2278                             c = 0xfffd;
2279                         } else if (c > 0x7f) {
2280                             /* First byte of a multibyte sequence received */
2281                             vc->vc_npar = 0;
2282                             if ((c & 0xe0) == 0xc0) {
2283                                 vc->vc_utf_count = 1;
2284                                 vc->vc_utf_char = (c & 0x1f);
2285                             } else if ((c & 0xf0) == 0xe0) {
2286                                 vc->vc_utf_count = 2;
2287                                 vc->vc_utf_char = (c & 0x0f);
2288                             } else if ((c & 0xf8) == 0xf0) {
2289                                 vc->vc_utf_count = 3;
2290                                 vc->vc_utf_char = (c & 0x07);
2291                             } else if ((c & 0xfc) == 0xf8) {
2292                                 vc->vc_utf_count = 4;
2293                                 vc->vc_utf_char = (c & 0x03);
2294                             } else if ((c & 0xfe) == 0xfc) {
2295                                 vc->vc_utf_count = 5;
2296                                 vc->vc_utf_char = (c & 0x01);
2297                             } else {
2298                                 /* 254 and 255 are invalid */
2299                                 c = 0xfffd;
2300                             }
2301                             if (vc->vc_utf_count) {
2302                                 /* Still need some bytes */
2303                                 continue;
2304                             }
2305                         }
2306                         /* Nothing to do if an ASCII byte was received */
2307                     }
2308                     /* End of UTF-8 decoding. */
2309                     /* c is the received character, or U+FFFD for invalid sequences. */
2310                     /* Replace invalid Unicode code points with U+FFFD too */
2311                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2312                         c = 0xfffd;
2313                     tc = c;
2314                 } else {        /* no utf or alternate charset mode */
2315                     tc = vc_translate(vc, c);
2316                 }
2317
2318                 param.c = tc;
2319                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2320                                         &param) == NOTIFY_STOP)
2321                         continue;
2322
2323                 /* If the original code was a control character we
2324                  * only allow a glyph to be displayed if the code is
2325                  * not normally used (such as for cursor movement) or
2326                  * if the disp_ctrl mode has been explicitly enabled.
2327                  * Certain characters (as given by the CTRL_ALWAYS
2328                  * bitmap) are always displayed as control characters,
2329                  * as the console would be pretty useless without
2330                  * them; to display an arbitrary font position use the
2331                  * direct-to-font zone in UTF-8 mode.
2332                  */
2333                 ok = tc && (c >= 32 ||
2334                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2335                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2336                         && (c != 127 || vc->vc_disp_ctrl)
2337                         && (c != 128+27);
2338
2339                 if (vc->vc_state == ESnormal && ok) {
2340                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2341                                 if (is_double_width(c))
2342                                         width = 2;
2343                         }
2344                         /* Now try to find out how to display it */
2345                         tc = conv_uni_to_pc(vc, tc);
2346                         if (tc & ~charmask) {
2347                                 if (tc == -1 || tc == -2) {
2348                                     continue; /* nothing to display */
2349                                 }
2350                                 /* Glyph not found */
2351                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2352                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2353                                        This would make absolutely no sense with Unicode in mind,
2354                                        but do this for ASCII characters since a font may lack
2355                                        Unicode mapping info and we don't want to end up with
2356                                        having question marks only. */
2357                                     tc = c;
2358                                 } else {
2359                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2360                                     tc = conv_uni_to_pc(vc, 0xfffd);
2361                                     if (tc < 0) {
2362                                         inverse = 1;
2363                                         tc = conv_uni_to_pc(vc, '?');
2364                                         if (tc < 0) tc = '?';
2365                                     }
2366                                 }
2367                         }
2368
2369                         if (!inverse) {
2370                                 vc_attr = vc->vc_attr;
2371                         } else {
2372                                 /* invert vc_attr */
2373                                 if (!vc->vc_can_do_color) {
2374                                         vc_attr = (vc->vc_attr) ^ 0x08;
2375                                 } else if (vc->vc_hi_font_mask == 0x100) {
2376                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2377                                 } else {
2378                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2379                                 }
2380                                 con_flush(vc, draw_from, draw_to, &draw_x);
2381                         }
2382
2383                         while (1) {
2384                                 if (vc->vc_need_wrap || vc->vc_decim)
2385                                         con_flush(vc, draw_from, draw_to,
2386                                                         &draw_x);
2387                                 if (vc->vc_need_wrap) {
2388                                         cr(vc);
2389                                         lf(vc);
2390                                 }
2391                                 if (vc->vc_decim)
2392                                         insert_char(vc, 1);
2393                                 scr_writew(himask ?
2394                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2395                                              (vc_attr << 8) + tc,
2396                                            (u16 *) vc->vc_pos);
2397                                 if (con_should_update(vc) && draw_x < 0) {
2398                                         draw_x = vc->vc_x;
2399                                         draw_from = vc->vc_pos;
2400                                 }
2401                                 if (vc->vc_x == vc->vc_cols - 1) {
2402                                         vc->vc_need_wrap = vc->vc_decawm;
2403                                         draw_to = vc->vc_pos + 2;
2404                                 } else {
2405                                         vc->vc_x++;
2406                                         draw_to = (vc->vc_pos += 2);
2407                                 }
2408
2409                                 if (!--width) break;
2410
2411                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2412                                 if (tc < 0) tc = ' ';
2413                         }
2414                         notify_write(vc, c);
2415
2416                         if (inverse)
2417                                 con_flush(vc, draw_from, draw_to, &draw_x);
2418
2419                         if (rescan) {
2420                                 rescan = 0;
2421                                 inverse = 0;
2422                                 width = 1;
2423                                 c = orig;
2424                                 goto rescan_last_byte;
2425                         }
2426                         continue;
2427                 }
2428                 con_flush(vc, draw_from, draw_to, &draw_x);
2429                 do_con_trol(tty, vc, orig);
2430         }
2431         con_flush(vc, draw_from, draw_to, &draw_x);
2432         console_conditional_schedule();
2433         console_unlock();
2434         notify_update(vc);
2435         return n;
2436 }
2437
2438 /*
2439  * This is the console switching callback.
2440  *
2441  * Doing console switching in a process context allows
2442  * us to do the switches asynchronously (needed when we want
2443  * to switch due to a keyboard interrupt).  Synchronization
2444  * with other console code and prevention of re-entrancy is
2445  * ensured with console_lock.
2446  */
2447 static void console_callback(struct work_struct *ignored)
2448 {
2449         console_lock();
2450
2451         if (want_console >= 0) {
2452                 if (want_console != fg_console &&
2453                     vc_cons_allocated(want_console)) {
2454                         hide_cursor(vc_cons[fg_console].d);
2455                         change_console(vc_cons[want_console].d);
2456                         /* we only changed when the console had already
2457                            been allocated - a new console is not created
2458                            in an interrupt routine */
2459                 }
2460                 want_console = -1;
2461         }
2462         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2463                 do_poke_blanked_console = 0;
2464                 poke_blanked_console();
2465         }
2466         if (scrollback_delta) {
2467                 struct vc_data *vc = vc_cons[fg_console].d;
2468                 clear_selection();
2469                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2470                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2471                 scrollback_delta = 0;
2472         }
2473         if (blank_timer_expired) {
2474                 do_blank_screen(0);
2475                 blank_timer_expired = 0;
2476         }
2477         notify_update(vc_cons[fg_console].d);
2478
2479         console_unlock();
2480 }
2481
2482 int set_console(int nr)
2483 {
2484         struct vc_data *vc = vc_cons[fg_console].d;
2485
2486         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2487                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2488
2489                 /*
2490                  * Console switch will fail in console_callback() or
2491                  * change_console() so there is no point scheduling
2492                  * the callback
2493                  *
2494                  * Existing set_console() users don't check the return
2495                  * value so this shouldn't break anything
2496                  */
2497                 return -EINVAL;
2498         }
2499
2500         want_console = nr;
2501         schedule_console_callback();
2502
2503         return 0;
2504 }
2505
2506 struct tty_driver *console_driver;
2507
2508 #ifdef CONFIG_VT_CONSOLE
2509
2510 /**
2511  * vt_kmsg_redirect() - Sets/gets the kernel message console
2512  * @new:        The new virtual terminal number or -1 if the console should stay
2513  *              unchanged
2514  *
2515  * By default, the kernel messages are always printed on the current virtual
2516  * console. However, the user may modify that default with the
2517  * TIOCL_SETKMSGREDIRECT ioctl call.
2518  *
2519  * This function sets the kernel message console to be @new. It returns the old
2520  * virtual console number. The virtual terminal number 0 (both as parameter and
2521  * return value) means no redirection (i.e. always printed on the currently
2522  * active console).
2523  *
2524  * The parameter -1 means that only the current console is returned, but the
2525  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2526  * case to make the code more understandable.
2527  *
2528  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2529  * the parameter and always returns 0.
2530  */
2531 int vt_kmsg_redirect(int new)
2532 {
2533         static int kmsg_con;
2534
2535         if (new != -1)
2536                 return xchg(&kmsg_con, new);
2537         else
2538                 return kmsg_con;
2539 }
2540
2541 /*
2542  *      Console on virtual terminal
2543  *
2544  * The console must be locked when we get here.
2545  */
2546
2547 static void vt_console_print(struct console *co, const char *b, unsigned count)
2548 {
2549         struct vc_data *vc = vc_cons[fg_console].d;
2550         unsigned char c;
2551         static DEFINE_SPINLOCK(printing_lock);
2552         const ushort *start;
2553         ushort cnt = 0;
2554         ushort myx;
2555         int kmsg_console;
2556
2557         /* console busy or not yet initialized */
2558         if (!printable)
2559                 return;
2560         if (!spin_trylock(&printing_lock))
2561                 return;
2562
2563         kmsg_console = vt_get_kmsg_redirect();
2564         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2565                 vc = vc_cons[kmsg_console - 1].d;
2566
2567         /* read `x' only after setting currcons properly (otherwise
2568            the `x' macro will read the x of the foreground console). */
2569         myx = vc->vc_x;
2570
2571         if (!vc_cons_allocated(fg_console)) {
2572                 /* impossible */
2573                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2574                 goto quit;
2575         }
2576
2577         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2578                 goto quit;
2579
2580         /* undraw cursor first */
2581         if (con_is_fg(vc))
2582                 hide_cursor(vc);
2583
2584         start = (ushort *)vc->vc_pos;
2585
2586         /* Contrived structure to try to emulate original need_wrap behaviour
2587          * Problems caused when we have need_wrap set on '\n' character */
2588         while (count--) {
2589                 c = *b++;
2590                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2591                         if (cnt > 0) {
2592                                 if (con_is_visible(vc))
2593                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2594                                 vc->vc_x += cnt;
2595                                 if (vc->vc_need_wrap)
2596                                         vc->vc_x--;
2597                                 cnt = 0;
2598                         }
2599                         if (c == 8) {           /* backspace */
2600                                 bs(vc);
2601                                 start = (ushort *)vc->vc_pos;
2602                                 myx = vc->vc_x;
2603                                 continue;
2604                         }
2605                         if (c != 13)
2606                                 lf(vc);
2607                         cr(vc);
2608                         start = (ushort *)vc->vc_pos;
2609                         myx = vc->vc_x;
2610                         if (c == 10 || c == 13)
2611                                 continue;
2612                 }
2613                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2614                 notify_write(vc, c);
2615                 cnt++;
2616                 if (myx == vc->vc_cols - 1) {
2617                         vc->vc_need_wrap = 1;
2618                         continue;
2619                 }
2620                 vc->vc_pos += 2;
2621                 myx++;
2622         }
2623         if (cnt > 0) {
2624                 if (con_is_visible(vc))
2625                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2626                 vc->vc_x += cnt;
2627                 if (vc->vc_x == vc->vc_cols) {
2628                         vc->vc_x--;
2629                         vc->vc_need_wrap = 1;
2630                 }
2631         }
2632         set_cursor(vc);
2633         notify_update(vc);
2634
2635 quit:
2636         spin_unlock(&printing_lock);
2637 }
2638
2639 static struct tty_driver *vt_console_device(struct console *c, int *index)
2640 {
2641         *index = c->index ? c->index-1 : fg_console;
2642         return console_driver;
2643 }
2644
2645 static struct console vt_console_driver = {
2646         .name           = "tty",
2647         .write          = vt_console_print,
2648         .device         = vt_console_device,
2649         .unblank        = unblank_screen,
2650         .flags          = CON_PRINTBUFFER,
2651         .index          = -1,
2652 };
2653 #endif
2654
2655 /*
2656  *      Handling of Linux-specific VC ioctls
2657  */
2658
2659 /*
2660  * Generally a bit racy with respect to console_lock();.
2661  *
2662  * There are some functions which don't need it.
2663  *
2664  * There are some functions which can sleep for arbitrary periods
2665  * (paste_selection) but we don't need the lock there anyway.
2666  *
2667  * set_selection has locking, and definitely needs it
2668  */
2669
2670 int tioclinux(struct tty_struct *tty, unsigned long arg)
2671 {
2672         char type, data;
2673         char __user *p = (char __user *)arg;
2674         int lines;
2675         int ret;
2676
2677         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2678                 return -EPERM;
2679         if (get_user(type, p))
2680                 return -EFAULT;
2681         ret = 0;
2682
2683         switch (type)
2684         {
2685                 case TIOCL_SETSEL:
2686                         console_lock();
2687                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2688                         console_unlock();
2689                         break;
2690                 case TIOCL_PASTESEL:
2691                         ret = paste_selection(tty);
2692                         break;
2693                 case TIOCL_UNBLANKSCREEN:
2694                         console_lock();
2695                         unblank_screen();
2696                         console_unlock();
2697                         break;
2698                 case TIOCL_SELLOADLUT:
2699                         console_lock();
2700                         ret = sel_loadlut(p);
2701                         console_unlock();
2702                         break;
2703                 case TIOCL_GETSHIFTSTATE:
2704
2705         /*
2706          * Make it possible to react to Shift+Mousebutton.
2707          * Note that 'shift_state' is an undocumented
2708          * kernel-internal variable; programs not closely
2709          * related to the kernel should not use this.
2710          */
2711                         data = vt_get_shift_state();
2712                         ret = __put_user(data, p);
2713                         break;
2714                 case TIOCL_GETMOUSEREPORTING:
2715                         console_lock(); /* May be overkill */
2716                         data = mouse_reporting();
2717                         console_unlock();
2718                         ret = __put_user(data, p);
2719                         break;
2720                 case TIOCL_SETVESABLANK:
2721                         console_lock();
2722                         ret = set_vesa_blanking(p);
2723                         console_unlock();
2724                         break;
2725                 case TIOCL_GETKMSGREDIRECT:
2726                         data = vt_get_kmsg_redirect();
2727                         ret = __put_user(data, p);
2728                         break;
2729                 case TIOCL_SETKMSGREDIRECT:
2730                         if (!capable(CAP_SYS_ADMIN)) {
2731                                 ret = -EPERM;
2732                         } else {
2733                                 if (get_user(data, p+1))
2734                                         ret = -EFAULT;
2735                                 else
2736                                         vt_kmsg_redirect(data);
2737                         }
2738                         break;
2739                 case TIOCL_GETFGCONSOLE:
2740                         /* No locking needed as this is a transiently
2741                            correct return anyway if the caller hasn't
2742                            disabled switching */
2743                         ret = fg_console;
2744                         break;
2745                 case TIOCL_SCROLLCONSOLE:
2746                         if (get_user(lines, (s32 __user *)(p+4))) {
2747                                 ret = -EFAULT;
2748                         } else {
2749                                 /* Need the console lock here. Note that lots
2750                                    of other calls need fixing before the lock
2751                                    is actually useful ! */
2752                                 console_lock();
2753                                 scrollfront(vc_cons[fg_console].d, lines);
2754                                 console_unlock();
2755                                 ret = 0;
2756                         }
2757                         break;
2758                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2759                         console_lock();
2760                         ignore_poke = 1;
2761                         do_blank_screen(0);
2762                         console_unlock();
2763                         break;
2764                 case TIOCL_BLANKEDSCREEN:
2765                         ret = console_blanked;
2766                         break;
2767                 default:
2768                         ret = -EINVAL;
2769                         break;
2770         }
2771         return ret;
2772 }
2773
2774 /*
2775  * /dev/ttyN handling
2776  */
2777
2778 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2779 {
2780         int     retval;
2781
2782         retval = do_con_write(tty, buf, count);
2783         con_flush_chars(tty);
2784
2785         return retval;
2786 }
2787
2788 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2789 {
2790         if (in_interrupt())
2791                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2792         return do_con_write(tty, &ch, 1);
2793 }
2794
2795 static int con_write_room(struct tty_struct *tty)
2796 {
2797         if (tty->stopped)
2798                 return 0;
2799         return 32768;           /* No limit, really; we're not buffering */
2800 }
2801
2802 static int con_chars_in_buffer(struct tty_struct *tty)
2803 {
2804         return 0;               /* we're not buffering */
2805 }
2806
2807 /*
2808  * con_throttle and con_unthrottle are only used for
2809  * paste_selection(), which has to stuff in a large number of
2810  * characters...
2811  */
2812 static void con_throttle(struct tty_struct *tty)
2813 {
2814 }
2815
2816 static void con_unthrottle(struct tty_struct *tty)
2817 {
2818         struct vc_data *vc = tty->driver_data;
2819
2820         wake_up_interruptible(&vc->paste_wait);
2821 }
2822
2823 /*
2824  * Turn the Scroll-Lock LED on when the tty is stopped
2825  */
2826 static void con_stop(struct tty_struct *tty)
2827 {
2828         int console_num;
2829         if (!tty)
2830                 return;
2831         console_num = tty->index;
2832         if (!vc_cons_allocated(console_num))
2833                 return;
2834         vt_kbd_con_stop(console_num);
2835 }
2836
2837 /*
2838  * Turn the Scroll-Lock LED off when the console is started
2839  */
2840 static void con_start(struct tty_struct *tty)
2841 {
2842         int console_num;
2843         if (!tty)
2844                 return;
2845         console_num = tty->index;
2846         if (!vc_cons_allocated(console_num))
2847                 return;
2848         vt_kbd_con_start(console_num);
2849 }
2850
2851 static void con_flush_chars(struct tty_struct *tty)
2852 {
2853         struct vc_data *vc;
2854
2855         if (in_interrupt())     /* from flush_to_ldisc */
2856                 return;
2857
2858         /* if we race with con_close(), vt may be null */
2859         console_lock();
2860         vc = tty->driver_data;
2861         if (vc)
2862                 set_cursor(vc);
2863         console_unlock();
2864 }
2865
2866 /*
2867  * Allocate the console screen memory.
2868  */
2869 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2870 {
2871         unsigned int currcons = tty->index;
2872         struct vc_data *vc;
2873         int ret;
2874
2875         console_lock();
2876         ret = vc_allocate(currcons);
2877         if (ret)
2878                 goto unlock;
2879
2880         vc = vc_cons[currcons].d;
2881
2882         /* Still being freed */
2883         if (vc->port.tty) {
2884                 ret = -ERESTARTSYS;
2885                 goto unlock;
2886         }
2887
2888         ret = tty_port_install(&vc->port, driver, tty);
2889         if (ret)
2890                 goto unlock;
2891
2892         tty->driver_data = vc;
2893         vc->port.tty = tty;
2894
2895         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2896                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2897                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2898         }
2899         if (vc->vc_utf)
2900                 tty->termios.c_iflag |= IUTF8;
2901         else
2902                 tty->termios.c_iflag &= ~IUTF8;
2903 unlock:
2904         console_unlock();
2905         return ret;
2906 }
2907
2908 static int con_open(struct tty_struct *tty, struct file *filp)
2909 {
2910         /* everything done in install */
2911         return 0;
2912 }
2913
2914
2915 static void con_close(struct tty_struct *tty, struct file *filp)
2916 {
2917         /* Nothing to do - we defer to shutdown */
2918 }
2919
2920 static void con_shutdown(struct tty_struct *tty)
2921 {
2922         struct vc_data *vc = tty->driver_data;
2923         BUG_ON(vc == NULL);
2924         console_lock();
2925         vc->port.tty = NULL;
2926         console_unlock();
2927 }
2928
2929 static int default_color           = 7; /* white */
2930 static int default_italic_color    = 2; // green (ASCII)
2931 static int default_underline_color = 3; // cyan (ASCII)
2932 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2933 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2934 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2935
2936 static void vc_init(struct vc_data *vc, unsigned int rows,
2937                     unsigned int cols, int do_clear)
2938 {
2939         int j, k ;
2940
2941         vc->vc_cols = cols;
2942         vc->vc_rows = rows;
2943         vc->vc_size_row = cols << 1;
2944         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2945
2946         set_origin(vc);
2947         vc->vc_pos = vc->vc_origin;
2948         reset_vc(vc);
2949         for (j=k=0; j<16; j++) {
2950                 vc->vc_palette[k++] = default_red[j] ;
2951                 vc->vc_palette[k++] = default_grn[j] ;
2952                 vc->vc_palette[k++] = default_blu[j] ;
2953         }
2954         vc->vc_def_color       = default_color;
2955         vc->vc_ulcolor         = default_underline_color;
2956         vc->vc_itcolor         = default_italic_color;
2957         vc->vc_halfcolor       = 0x08;   /* grey */
2958         init_waitqueue_head(&vc->paste_wait);
2959         reset_terminal(vc, do_clear);
2960 }
2961
2962 /*
2963  * This routine initializes console interrupts, and does nothing
2964  * else. If you want the screen to clear, call tty_write with
2965  * the appropriate escape-sequence.
2966  */
2967
2968 static int __init con_init(void)
2969 {
2970         const char *display_desc = NULL;
2971         struct vc_data *vc;
2972         unsigned int currcons = 0, i;
2973
2974         console_lock();
2975
2976         if (conswitchp)
2977                 display_desc = conswitchp->con_startup();
2978         if (!display_desc) {
2979                 fg_console = 0;
2980                 console_unlock();
2981                 return 0;
2982         }
2983
2984         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2985                 struct con_driver *con_driver = &registered_con_driver[i];
2986
2987                 if (con_driver->con == NULL) {
2988                         con_driver->con = conswitchp;
2989                         con_driver->desc = display_desc;
2990                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2991                         con_driver->first = 0;
2992                         con_driver->last = MAX_NR_CONSOLES - 1;
2993                         break;
2994                 }
2995         }
2996
2997         for (i = 0; i < MAX_NR_CONSOLES; i++)
2998                 con_driver_map[i] = conswitchp;
2999
3000         if (blankinterval) {
3001                 blank_state = blank_normal_wait;
3002                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3003         }
3004
3005         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3006                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3007                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3008                 tty_port_init(&vc->port);
3009                 visual_init(vc, currcons, 1);
3010                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3011                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3012                         currcons || !vc->vc_sw->con_save_screen);
3013         }
3014         currcons = fg_console = 0;
3015         master_display_fg = vc = vc_cons[currcons].d;
3016         set_origin(vc);
3017         save_screen(vc);
3018         gotoxy(vc, vc->vc_x, vc->vc_y);
3019         csi_J(vc, 0);
3020         update_screen(vc);
3021         pr_info("Console: %s %s %dx%d\n",
3022                 vc->vc_can_do_color ? "colour" : "mono",
3023                 display_desc, vc->vc_cols, vc->vc_rows);
3024         printable = 1;
3025
3026         console_unlock();
3027
3028 #ifdef CONFIG_VT_CONSOLE
3029         register_console(&vt_console_driver);
3030 #endif
3031         return 0;
3032 }
3033 console_initcall(con_init);
3034
3035 static const struct tty_operations con_ops = {
3036         .install = con_install,
3037         .open = con_open,
3038         .close = con_close,
3039         .write = con_write,
3040         .write_room = con_write_room,
3041         .put_char = con_put_char,
3042         .flush_chars = con_flush_chars,
3043         .chars_in_buffer = con_chars_in_buffer,
3044         .ioctl = vt_ioctl,
3045 #ifdef CONFIG_COMPAT
3046         .compat_ioctl = vt_compat_ioctl,
3047 #endif
3048         .stop = con_stop,
3049         .start = con_start,
3050         .throttle = con_throttle,
3051         .unthrottle = con_unthrottle,
3052         .resize = vt_resize,
3053         .shutdown = con_shutdown
3054 };
3055
3056 static struct cdev vc0_cdev;
3057
3058 static ssize_t show_tty_active(struct device *dev,
3059                                 struct device_attribute *attr, char *buf)
3060 {
3061         return sprintf(buf, "tty%d\n", fg_console + 1);
3062 }
3063 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3064
3065 static struct attribute *vt_dev_attrs[] = {
3066         &dev_attr_active.attr,
3067         NULL
3068 };
3069
3070 ATTRIBUTE_GROUPS(vt_dev);
3071
3072 int __init vty_init(const struct file_operations *console_fops)
3073 {
3074         cdev_init(&vc0_cdev, console_fops);
3075         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3076             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3077                 panic("Couldn't register /dev/tty0 driver\n");
3078         tty0dev = device_create_with_groups(tty_class, NULL,
3079                                             MKDEV(TTY_MAJOR, 0), NULL,
3080                                             vt_dev_groups, "tty0");
3081         if (IS_ERR(tty0dev))
3082                 tty0dev = NULL;
3083
3084         vcs_init();
3085
3086         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3087         if (!console_driver)
3088                 panic("Couldn't allocate console driver\n");
3089
3090         console_driver->name = "tty";
3091         console_driver->name_base = 1;
3092         console_driver->major = TTY_MAJOR;
3093         console_driver->minor_start = 1;
3094         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3095         console_driver->init_termios = tty_std_termios;
3096         if (default_utf8)
3097                 console_driver->init_termios.c_iflag |= IUTF8;
3098         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3099         tty_set_operations(console_driver, &con_ops);
3100         if (tty_register_driver(console_driver))
3101                 panic("Couldn't register console driver\n");
3102         kbd_init();
3103         console_map_init();
3104 #ifdef CONFIG_MDA_CONSOLE
3105         mda_console_init();
3106 #endif
3107         return 0;
3108 }
3109
3110 #ifndef VT_SINGLE_DRIVER
3111
3112 static struct class *vtconsole_class;
3113
3114 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3115                            int deflt)
3116 {
3117         struct module *owner = csw->owner;
3118         const char *desc = NULL;
3119         struct con_driver *con_driver;
3120         int i, j = -1, k = -1, retval = -ENODEV;
3121
3122         if (!try_module_get(owner))
3123                 return -ENODEV;
3124
3125         WARN_CONSOLE_UNLOCKED();
3126
3127         /* check if driver is registered */
3128         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3129                 con_driver = &registered_con_driver[i];
3130
3131                 if (con_driver->con == csw) {
3132                         desc = con_driver->desc;
3133                         retval = 0;
3134                         break;
3135                 }
3136         }
3137
3138         if (retval)
3139                 goto err;
3140
3141         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3142                 csw->con_startup();
3143                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3144         }
3145
3146         if (deflt) {
3147                 if (conswitchp)
3148                         module_put(conswitchp->owner);
3149
3150                 __module_get(owner);
3151                 conswitchp = csw;
3152         }
3153
3154         first = max(first, con_driver->first);
3155         last = min(last, con_driver->last);
3156
3157         for (i = first; i <= last; i++) {
3158                 int old_was_color;
3159                 struct vc_data *vc = vc_cons[i].d;
3160
3161                 if (con_driver_map[i])
3162                         module_put(con_driver_map[i]->owner);
3163                 __module_get(owner);
3164                 con_driver_map[i] = csw;
3165
3166                 if (!vc || !vc->vc_sw)
3167                         continue;
3168
3169                 j = i;
3170
3171                 if (con_is_visible(vc)) {
3172                         k = i;
3173                         save_screen(vc);
3174                 }
3175
3176                 old_was_color = vc->vc_can_do_color;
3177                 vc->vc_sw->con_deinit(vc);
3178                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3179                 visual_init(vc, i, 0);
3180                 set_origin(vc);
3181                 update_attr(vc);
3182
3183                 /* If the console changed between mono <-> color, then
3184                  * the attributes in the screenbuf will be wrong.  The
3185                  * following resets all attributes to something sane.
3186                  */
3187                 if (old_was_color != vc->vc_can_do_color)
3188                         clear_buffer_attributes(vc);
3189         }
3190
3191         pr_info("Console: switching ");
3192         if (!deflt)
3193                 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
3194         if (j >= 0) {
3195                 struct vc_data *vc = vc_cons[j].d;
3196
3197                 printk(KERN_CONT "to %s %s %dx%d\n",
3198                        vc->vc_can_do_color ? "colour" : "mono",
3199                        desc, vc->vc_cols, vc->vc_rows);
3200
3201                 if (k >= 0) {
3202                         vc = vc_cons[k].d;
3203                         update_screen(vc);
3204                 }
3205         } else
3206                 printk(KERN_CONT "to %s\n", desc);
3207
3208         retval = 0;
3209 err:
3210         module_put(owner);
3211         return retval;
3212 };
3213
3214
3215 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3216 /* unlocked version of unbind_con_driver() */
3217 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3218 {
3219         struct module *owner = csw->owner;
3220         const struct consw *defcsw = NULL;
3221         struct con_driver *con_driver = NULL, *con_back = NULL;
3222         int i, retval = -ENODEV;
3223
3224         if (!try_module_get(owner))
3225                 return -ENODEV;
3226
3227         WARN_CONSOLE_UNLOCKED();
3228
3229         /* check if driver is registered and if it is unbindable */
3230         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3231                 con_driver = &registered_con_driver[i];
3232
3233                 if (con_driver->con == csw &&
3234                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3235                         retval = 0;
3236                         break;
3237                 }
3238         }
3239
3240         if (retval)
3241                 goto err;
3242
3243         retval = -ENODEV;
3244
3245         /* check if backup driver exists */
3246         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3247                 con_back = &registered_con_driver[i];
3248
3249                 if (con_back->con && con_back->con != csw) {
3250                         defcsw = con_back->con;
3251                         retval = 0;
3252                         break;
3253                 }
3254         }
3255
3256         if (retval)
3257                 goto err;
3258
3259         if (!con_is_bound(csw))
3260                 goto err;
3261
3262         first = max(first, con_driver->first);
3263         last = min(last, con_driver->last);
3264
3265         for (i = first; i <= last; i++) {
3266                 if (con_driver_map[i] == csw) {
3267                         module_put(csw->owner);
3268                         con_driver_map[i] = NULL;
3269                 }
3270         }
3271
3272         if (!con_is_bound(defcsw)) {
3273                 const struct consw *defconsw = conswitchp;
3274
3275                 defcsw->con_startup();
3276                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3277                 /*
3278                  * vgacon may change the default driver to point
3279                  * to dummycon, we restore it here...
3280                  */
3281                 conswitchp = defconsw;
3282         }
3283
3284         if (!con_is_bound(csw))
3285                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3286
3287         /* ignore return value, binding should not fail */
3288         do_bind_con_driver(defcsw, first, last, deflt);
3289 err:
3290         module_put(owner);
3291         return retval;
3292
3293 }
3294 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3295
3296 static int vt_bind(struct con_driver *con)
3297 {
3298         const struct consw *defcsw = NULL, *csw = NULL;
3299         int i, more = 1, first = -1, last = -1, deflt = 0;
3300
3301         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3302                 goto err;
3303
3304         csw = con->con;
3305
3306         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3307                 struct con_driver *con = &registered_con_driver[i];
3308
3309                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3310                         defcsw = con->con;
3311                         break;
3312                 }
3313         }
3314
3315         if (!defcsw)
3316                 goto err;
3317
3318         while (more) {
3319                 more = 0;
3320
3321                 for (i = con->first; i <= con->last; i++) {
3322                         if (con_driver_map[i] == defcsw) {
3323                                 if (first == -1)
3324                                         first = i;
3325                                 last = i;
3326                                 more = 1;
3327                         } else if (first != -1)
3328                                 break;
3329                 }
3330
3331                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3332                         deflt = 1;
3333
3334                 if (first != -1)
3335                         do_bind_con_driver(csw, first, last, deflt);
3336
3337                 first = -1;
3338                 last = -1;
3339                 deflt = 0;
3340         }
3341
3342 err:
3343         return 0;
3344 }
3345
3346 static int vt_unbind(struct con_driver *con)
3347 {
3348         const struct consw *csw = NULL;
3349         int i, more = 1, first = -1, last = -1, deflt = 0;
3350         int ret;
3351
3352         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3353                 goto err;
3354
3355         csw = con->con;
3356
3357         while (more) {
3358                 more = 0;
3359
3360                 for (i = con->first; i <= con->last; i++) {
3361                         if (con_driver_map[i] == csw) {
3362                                 if (first == -1)
3363                                         first = i;
3364                                 last = i;
3365                                 more = 1;
3366                         } else if (first != -1)
3367                                 break;
3368                 }
3369
3370                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3371                         deflt = 1;
3372
3373                 if (first != -1) {
3374                         ret = do_unbind_con_driver(csw, first, last, deflt);
3375                         if (ret != 0)
3376                                 return ret;
3377                 }
3378
3379                 first = -1;
3380                 last = -1;
3381                 deflt = 0;
3382         }
3383
3384 err:
3385         return 0;
3386 }
3387 #else
3388 static inline int vt_bind(struct con_driver *con)
3389 {
3390         return 0;
3391 }
3392 static inline int vt_unbind(struct con_driver *con)
3393 {
3394         return 0;
3395 }
3396 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3397
3398 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3399                           const char *buf, size_t count)
3400 {
3401         struct con_driver *con = dev_get_drvdata(dev);
3402         int bind = simple_strtoul(buf, NULL, 0);
3403
3404         console_lock();
3405
3406         if (bind)
3407                 vt_bind(con);
3408         else
3409                 vt_unbind(con);
3410
3411         console_unlock();
3412
3413         return count;
3414 }
3415
3416 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3417                          char *buf)
3418 {
3419         struct con_driver *con = dev_get_drvdata(dev);
3420         int bind = con_is_bound(con->con);
3421
3422         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3423 }
3424
3425 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3426                          char *buf)
3427 {
3428         struct con_driver *con = dev_get_drvdata(dev);
3429
3430         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3431                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3432                          con->desc);
3433
3434 }
3435
3436 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3437 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3438
3439 static struct attribute *con_dev_attrs[] = {
3440         &dev_attr_bind.attr,
3441         &dev_attr_name.attr,
3442         NULL
3443 };
3444
3445 ATTRIBUTE_GROUPS(con_dev);
3446
3447 static int vtconsole_init_device(struct con_driver *con)
3448 {
3449         con->flag |= CON_DRIVER_FLAG_ATTR;
3450         return 0;
3451 }
3452
3453 static void vtconsole_deinit_device(struct con_driver *con)
3454 {
3455         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3456 }
3457
3458 /**
3459  * con_is_bound - checks if driver is bound to the console
3460  * @csw: console driver
3461  *
3462  * RETURNS: zero if unbound, nonzero if bound
3463  *
3464  * Drivers can call this and if zero, they should release
3465  * all resources allocated on con_startup()
3466  */
3467 int con_is_bound(const struct consw *csw)
3468 {
3469         int i, bound = 0;
3470
3471         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3472                 if (con_driver_map[i] == csw) {
3473                         bound = 1;
3474                         break;
3475                 }
3476         }
3477
3478         return bound;
3479 }
3480 EXPORT_SYMBOL(con_is_bound);
3481
3482 /**
3483  * con_debug_enter - prepare the console for the kernel debugger
3484  * @sw: console driver
3485  *
3486  * Called when the console is taken over by the kernel debugger, this
3487  * function needs to save the current console state, then put the console
3488  * into a state suitable for the kernel debugger.
3489  *
3490  * RETURNS:
3491  * Zero on success, nonzero if a failure occurred when trying to prepare
3492  * the console for the debugger.
3493  */
3494 int con_debug_enter(struct vc_data *vc)
3495 {
3496         int ret = 0;
3497
3498         saved_fg_console = fg_console;
3499         saved_last_console = last_console;
3500         saved_want_console = want_console;
3501         saved_vc_mode = vc->vc_mode;
3502         saved_console_blanked = console_blanked;
3503         vc->vc_mode = KD_TEXT;
3504         console_blanked = 0;
3505         if (vc->vc_sw->con_debug_enter)
3506                 ret = vc->vc_sw->con_debug_enter(vc);
3507 #ifdef CONFIG_KGDB_KDB
3508         /* Set the initial LINES variable if it is not already set */
3509         if (vc->vc_rows < 999) {
3510                 int linecount;
3511                 char lns[4];
3512                 const char *setargs[3] = {
3513                         "set",
3514                         "LINES",
3515                         lns,
3516                 };
3517                 if (kdbgetintenv(setargs[0], &linecount)) {
3518                         snprintf(lns, 4, "%i", vc->vc_rows);
3519                         kdb_set(2, setargs);
3520                 }
3521         }
3522         if (vc->vc_cols < 999) {
3523                 int colcount;
3524                 char cols[4];
3525                 const char *setargs[3] = {
3526                         "set",
3527                         "COLUMNS",
3528                         cols,
3529                 };
3530                 if (kdbgetintenv(setargs[0], &colcount)) {
3531                         snprintf(cols, 4, "%i", vc->vc_cols);
3532                         kdb_set(2, setargs);
3533                 }
3534         }
3535 #endif /* CONFIG_KGDB_KDB */
3536         return ret;
3537 }
3538 EXPORT_SYMBOL_GPL(con_debug_enter);
3539
3540 /**
3541  * con_debug_leave - restore console state
3542  * @sw: console driver
3543  *
3544  * Restore the console state to what it was before the kernel debugger
3545  * was invoked.
3546  *
3547  * RETURNS:
3548  * Zero on success, nonzero if a failure occurred when trying to restore
3549  * the console.
3550  */
3551 int con_debug_leave(void)
3552 {
3553         struct vc_data *vc;
3554         int ret = 0;
3555
3556         fg_console = saved_fg_console;
3557         last_console = saved_last_console;
3558         want_console = saved_want_console;
3559         console_blanked = saved_console_blanked;
3560         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3561
3562         vc = vc_cons[fg_console].d;
3563         if (vc->vc_sw->con_debug_leave)
3564                 ret = vc->vc_sw->con_debug_leave(vc);
3565         return ret;
3566 }
3567 EXPORT_SYMBOL_GPL(con_debug_leave);
3568
3569 static int do_register_con_driver(const struct consw *csw, int first, int last)
3570 {
3571         struct module *owner = csw->owner;
3572         struct con_driver *con_driver;
3573         const char *desc;
3574         int i, retval;
3575
3576         WARN_CONSOLE_UNLOCKED();
3577
3578         if (!try_module_get(owner))
3579                 return -ENODEV;
3580
3581         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3582                 con_driver = &registered_con_driver[i];
3583
3584                 /* already registered */
3585                 if (con_driver->con == csw) {
3586                         retval = -EBUSY;
3587                         goto err;
3588                 }
3589         }
3590
3591         desc = csw->con_startup();
3592         if (!desc) {
3593                 retval = -ENODEV;
3594                 goto err;
3595         }
3596
3597         retval = -EINVAL;
3598
3599         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3600                 con_driver = &registered_con_driver[i];
3601
3602                 if (con_driver->con == NULL &&
3603                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3604                         con_driver->con = csw;
3605                         con_driver->desc = desc;
3606                         con_driver->node = i;
3607                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3608                                            CON_DRIVER_FLAG_INIT;
3609                         con_driver->first = first;
3610                         con_driver->last = last;
3611                         retval = 0;
3612                         break;
3613                 }
3614         }
3615
3616         if (retval)
3617                 goto err;
3618
3619         con_driver->dev =
3620                 device_create_with_groups(vtconsole_class, NULL,
3621                                           MKDEV(0, con_driver->node),
3622                                           con_driver, con_dev_groups,
3623                                           "vtcon%i", con_driver->node);
3624         if (IS_ERR(con_driver->dev)) {
3625                 printk(KERN_WARNING "Unable to create device for %s; "
3626                        "errno = %ld\n", con_driver->desc,
3627                        PTR_ERR(con_driver->dev));
3628                 con_driver->dev = NULL;
3629         } else {
3630                 vtconsole_init_device(con_driver);
3631         }
3632
3633 err:
3634         module_put(owner);
3635         return retval;
3636 }
3637
3638
3639 /**
3640  * do_unregister_con_driver - unregister console driver from console layer
3641  * @csw: console driver
3642  *
3643  * DESCRIPTION: All drivers that registers to the console layer must
3644  * call this function upon exit, or if the console driver is in a state
3645  * where it won't be able to handle console services, such as the
3646  * framebuffer console without loaded framebuffer drivers.
3647  *
3648  * The driver must unbind first prior to unregistration.
3649  */
3650 int do_unregister_con_driver(const struct consw *csw)
3651 {
3652         int i;
3653
3654         /* cannot unregister a bound driver */
3655         if (con_is_bound(csw))
3656                 return -EBUSY;
3657
3658         if (csw == conswitchp)
3659                 return -EINVAL;
3660
3661         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3662                 struct con_driver *con_driver = &registered_con_driver[i];
3663
3664                 if (con_driver->con == csw) {
3665                         /*
3666                          * Defer the removal of the sysfs entries since that
3667                          * will acquire the kernfs s_active lock and we can't
3668                          * acquire this lock while holding the console lock:
3669                          * the unbind sysfs entry imposes already the opposite
3670                          * order. Reset con already here to prevent any later
3671                          * lookup to succeed and mark this slot as zombie, so
3672                          * it won't get reused until we complete the removal
3673                          * in the deferred work.
3674                          */
3675                         con_driver->con = NULL;
3676                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3677                         schedule_work(&con_driver_unregister_work);
3678
3679                         return 0;
3680                 }
3681         }
3682
3683         return -ENODEV;
3684 }
3685 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3686
3687 static void con_driver_unregister_callback(struct work_struct *ignored)
3688 {
3689         int i;
3690
3691         console_lock();
3692
3693         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3694                 struct con_driver *con_driver = &registered_con_driver[i];
3695
3696                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3697                         continue;
3698
3699                 console_unlock();
3700
3701                 vtconsole_deinit_device(con_driver);
3702                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3703
3704                 console_lock();
3705
3706                 if (WARN_ON_ONCE(con_driver->con))
3707                         con_driver->con = NULL;
3708                 con_driver->desc = NULL;
3709                 con_driver->dev = NULL;
3710                 con_driver->node = 0;
3711                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3712                 con_driver->flag = 0;
3713                 con_driver->first = 0;
3714                 con_driver->last = 0;
3715         }
3716
3717         console_unlock();
3718 }
3719
3720 /*
3721  *      If we support more console drivers, this function is used
3722  *      when a driver wants to take over some existing consoles
3723  *      and become default driver for newly opened ones.
3724  *
3725  *      do_take_over_console is basically a register followed by unbind
3726  */
3727 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3728 {
3729         int err;
3730
3731         err = do_register_con_driver(csw, first, last);
3732         /*
3733          * If we get an busy error we still want to bind the console driver
3734          * and return success, as we may have unbound the console driver
3735          * but not unregistered it.
3736          */
3737         if (err == -EBUSY)
3738                 err = 0;
3739         if (!err)
3740                 do_bind_con_driver(csw, first, last, deflt);
3741
3742         return err;
3743 }
3744 EXPORT_SYMBOL_GPL(do_take_over_console);
3745
3746
3747 /*
3748  * give_up_console is a wrapper to unregister_con_driver. It will only
3749  * work if driver is fully unbound.
3750  */
3751 void give_up_console(const struct consw *csw)
3752 {
3753         console_lock();
3754         do_unregister_con_driver(csw);
3755         console_unlock();
3756 }
3757
3758 static int __init vtconsole_class_init(void)
3759 {
3760         int i;
3761
3762         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3763         if (IS_ERR(vtconsole_class)) {
3764                 printk(KERN_WARNING "Unable to create vt console class; "
3765                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3766                 vtconsole_class = NULL;
3767         }
3768
3769         /* Add system drivers to sysfs */
3770         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3771                 struct con_driver *con = &registered_con_driver[i];
3772
3773                 if (con->con && !con->dev) {
3774                         con->dev =
3775                                 device_create_with_groups(vtconsole_class, NULL,
3776                                                           MKDEV(0, con->node),
3777                                                           con, con_dev_groups,
3778                                                           "vtcon%i", con->node);
3779
3780                         if (IS_ERR(con->dev)) {
3781                                 printk(KERN_WARNING "Unable to create "
3782                                        "device for %s; errno = %ld\n",
3783                                        con->desc, PTR_ERR(con->dev));
3784                                 con->dev = NULL;
3785                         } else {
3786                                 vtconsole_init_device(con);
3787                         }
3788                 }
3789         }
3790
3791         return 0;
3792 }
3793 postcore_initcall(vtconsole_class_init);
3794
3795 #endif
3796
3797 /*
3798  *      Screen blanking
3799  */
3800
3801 static int set_vesa_blanking(char __user *p)
3802 {
3803         unsigned int mode;
3804
3805         if (get_user(mode, p + 1))
3806                 return -EFAULT;
3807
3808         vesa_blank_mode = (mode < 4) ? mode : 0;
3809         return 0;
3810 }
3811
3812 void do_blank_screen(int entering_gfx)
3813 {
3814         struct vc_data *vc = vc_cons[fg_console].d;
3815         int i;
3816
3817         WARN_CONSOLE_UNLOCKED();
3818
3819         if (console_blanked) {
3820                 if (blank_state == blank_vesa_wait) {
3821                         blank_state = blank_off;
3822                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3823                 }
3824                 return;
3825         }
3826
3827         /* entering graphics mode? */
3828         if (entering_gfx) {
3829                 hide_cursor(vc);
3830                 save_screen(vc);
3831                 vc->vc_sw->con_blank(vc, -1, 1);
3832                 console_blanked = fg_console + 1;
3833                 blank_state = blank_off;
3834                 set_origin(vc);
3835                 return;
3836         }
3837
3838         if (blank_state != blank_normal_wait)
3839                 return;
3840         blank_state = blank_off;
3841
3842         /* don't blank graphics */
3843         if (vc->vc_mode != KD_TEXT) {
3844                 console_blanked = fg_console + 1;
3845                 return;
3846         }
3847
3848         hide_cursor(vc);
3849         del_timer_sync(&console_timer);
3850         blank_timer_expired = 0;
3851
3852         save_screen(vc);
3853         /* In case we need to reset origin, blanking hook returns 1 */
3854         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3855         console_blanked = fg_console + 1;
3856         if (i)
3857                 set_origin(vc);
3858
3859         if (console_blank_hook && console_blank_hook(1))
3860                 return;
3861
3862         if (vesa_off_interval && vesa_blank_mode) {
3863                 blank_state = blank_vesa_wait;
3864                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3865         }
3866         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3867 }
3868 EXPORT_SYMBOL(do_blank_screen);
3869
3870 /*
3871  * Called by timer as well as from vt_console_driver
3872  */
3873 void do_unblank_screen(int leaving_gfx)
3874 {
3875         struct vc_data *vc;
3876
3877         /* This should now always be called from a "sane" (read: can schedule)
3878          * context for the sake of the low level drivers, except in the special
3879          * case of oops_in_progress
3880          */
3881         if (!oops_in_progress)
3882                 might_sleep();
3883
3884         WARN_CONSOLE_UNLOCKED();
3885
3886         ignore_poke = 0;
3887         if (!console_blanked)
3888                 return;
3889         if (!vc_cons_allocated(fg_console)) {
3890                 /* impossible */
3891                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3892                         fg_console + 1);
3893                 return;
3894         }
3895         vc = vc_cons[fg_console].d;
3896         /* Try to unblank in oops case too */
3897         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3898                 return; /* but leave console_blanked != 0 */
3899
3900         if (blankinterval) {
3901                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3902                 blank_state = blank_normal_wait;
3903         }
3904
3905         console_blanked = 0;
3906         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3907                 /* Low-level driver cannot restore -> do it ourselves */
3908                 update_screen(vc);
3909         if (console_blank_hook)
3910                 console_blank_hook(0);
3911         set_palette(vc);
3912         set_cursor(vc);
3913         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3914 }
3915 EXPORT_SYMBOL(do_unblank_screen);
3916
3917 /*
3918  * This is called by the outside world to cause a forced unblank, mostly for
3919  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3920  * call it with 1 as an argument and so force a mode restore... that may kill
3921  * X or at least garbage the screen but would also make the Oops visible...
3922  */
3923 void unblank_screen(void)
3924 {
3925         do_unblank_screen(0);
3926 }
3927
3928 /*
3929  * We defer the timer blanking to work queue so it can take the console mutex
3930  * (console operations can still happen at irq time, but only from printk which
3931  * has the console mutex. Not perfect yet, but better than no locking
3932  */
3933 static void blank_screen_t(unsigned long dummy)
3934 {
3935         blank_timer_expired = 1;
3936         schedule_work(&console_work);
3937 }
3938
3939 void poke_blanked_console(void)
3940 {
3941         WARN_CONSOLE_UNLOCKED();
3942
3943         /* Add this so we quickly catch whoever might call us in a non
3944          * safe context. Nowadays, unblank_screen() isn't to be called in
3945          * atomic contexts and is allowed to schedule (with the special case
3946          * of oops_in_progress, but that isn't of any concern for this
3947          * function. --BenH.
3948          */
3949         might_sleep();
3950
3951         /* This isn't perfectly race free, but a race here would be mostly harmless,
3952          * at worse, we'll do a spurrious blank and it's unlikely
3953          */
3954         del_timer(&console_timer);
3955         blank_timer_expired = 0;
3956
3957         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3958                 return;
3959         if (console_blanked)
3960                 unblank_screen();
3961         else if (blankinterval) {
3962                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3963                 blank_state = blank_normal_wait;
3964         }
3965 }
3966
3967 /*
3968  *      Palettes
3969  */
3970
3971 static void set_palette(struct vc_data *vc)
3972 {
3973         WARN_CONSOLE_UNLOCKED();
3974
3975         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3976                 vc->vc_sw->con_set_palette(vc, color_table);
3977 }
3978
3979 /*
3980  * Load palette into the DAC registers. arg points to a colour
3981  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3982  */
3983
3984 int con_set_cmap(unsigned char __user *arg)
3985 {
3986         int i, j, k;
3987         unsigned char colormap[3*16];
3988
3989         if (copy_from_user(colormap, arg, sizeof(colormap)))
3990                 return -EFAULT;
3991
3992         console_lock();
3993         for (i = k = 0; i < 16; i++) {
3994                 default_red[i] = colormap[k++];
3995                 default_grn[i] = colormap[k++];
3996                 default_blu[i] = colormap[k++];
3997         }
3998         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3999                 if (!vc_cons_allocated(i))
4000                         continue;
4001                 for (j = k = 0; j < 16; j++) {
4002                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4003                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4004                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4005                 }
4006                 set_palette(vc_cons[i].d);
4007         }
4008         console_unlock();
4009
4010         return 0;
4011 }
4012
4013 int con_get_cmap(unsigned char __user *arg)
4014 {
4015         int i, k;
4016         unsigned char colormap[3*16];
4017
4018         console_lock();
4019         for (i = k = 0; i < 16; i++) {
4020                 colormap[k++] = default_red[i];
4021                 colormap[k++] = default_grn[i];
4022                 colormap[k++] = default_blu[i];
4023         }
4024         console_unlock();
4025
4026         if (copy_to_user(arg, colormap, sizeof(colormap)))
4027                 return -EFAULT;
4028
4029         return 0;
4030 }
4031
4032 void reset_palette(struct vc_data *vc)
4033 {
4034         int j, k;
4035         for (j=k=0; j<16; j++) {
4036                 vc->vc_palette[k++] = default_red[j];
4037                 vc->vc_palette[k++] = default_grn[j];
4038                 vc->vc_palette[k++] = default_blu[j];
4039         }
4040         set_palette(vc);
4041 }
4042
4043 /*
4044  *  Font switching
4045  *
4046  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4047  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4048  *  depending on width) reserved for each character which is kinda wasty, but
4049  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4050  *  is up to the actual low-level console-driver convert data into its favorite
4051  *  format (maybe we should add a `fontoffset' field to the `display'
4052  *  structure so we won't have to convert the fontdata all the time.
4053  *  /Jes
4054  */
4055
4056 #define max_font_size 65536
4057
4058 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4059 {
4060         struct console_font font;
4061         int rc = -EINVAL;
4062         int c;
4063
4064         if (op->data) {
4065                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4066                 if (!font.data)
4067                         return -ENOMEM;
4068         } else
4069                 font.data = NULL;
4070
4071         console_lock();
4072         if (vc->vc_mode != KD_TEXT)
4073                 rc = -EINVAL;
4074         else if (vc->vc_sw->con_font_get)
4075                 rc = vc->vc_sw->con_font_get(vc, &font);
4076         else
4077                 rc = -ENOSYS;
4078         console_unlock();
4079
4080         if (rc)
4081                 goto out;
4082
4083         c = (font.width+7)/8 * 32 * font.charcount;
4084
4085         if (op->data && font.charcount > op->charcount)
4086                 rc = -ENOSPC;
4087         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4088                 if (font.width > op->width || font.height > op->height)
4089                         rc = -ENOSPC;
4090         } else {
4091                 if (font.width != 8)
4092                         rc = -EIO;
4093                 else if ((op->height && font.height > op->height) ||
4094                          font.height > 32)
4095                         rc = -ENOSPC;
4096         }
4097         if (rc)
4098                 goto out;
4099
4100         op->height = font.height;
4101         op->width = font.width;
4102         op->charcount = font.charcount;
4103
4104         if (op->data && copy_to_user(op->data, font.data, c))
4105                 rc = -EFAULT;
4106
4107 out:
4108         kfree(font.data);
4109         return rc;
4110 }
4111
4112 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4113 {
4114         struct console_font font;
4115         int rc = -EINVAL;
4116         int size;
4117
4118         if (vc->vc_mode != KD_TEXT)
4119                 return -EINVAL;
4120         if (!op->data)
4121                 return -EINVAL;
4122         if (op->charcount > 512)
4123                 return -EINVAL;
4124         if (!op->height) {              /* Need to guess font height [compat] */
4125                 int h, i;
4126                 u8 __user *charmap = op->data;
4127                 u8 tmp;
4128
4129                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4130                    so that we can get rid of this soon */
4131                 if (!(op->flags & KD_FONT_FLAG_OLD))
4132                         return -EINVAL;
4133                 for (h = 32; h > 0; h--)
4134                         for (i = 0; i < op->charcount; i++) {
4135                                 if (get_user(tmp, &charmap[32*i+h-1]))
4136                                         return -EFAULT;
4137                                 if (tmp)
4138                                         goto nonzero;
4139                         }
4140                 return -EINVAL;
4141         nonzero:
4142                 op->height = h;
4143         }
4144         if (op->width <= 0 || op->width > 32 || op->height > 32)
4145                 return -EINVAL;
4146         size = (op->width+7)/8 * 32 * op->charcount;
4147         if (size > max_font_size)
4148                 return -ENOSPC;
4149         font.charcount = op->charcount;
4150         font.height = op->height;
4151         font.width = op->width;
4152         font.data = memdup_user(op->data, size);
4153         if (IS_ERR(font.data))
4154                 return PTR_ERR(font.data);
4155         console_lock();
4156         if (vc->vc_mode != KD_TEXT)
4157                 rc = -EINVAL;
4158         else if (vc->vc_sw->con_font_set)
4159                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4160         else
4161                 rc = -ENOSYS;
4162         console_unlock();
4163         kfree(font.data);
4164         return rc;
4165 }
4166
4167 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4168 {
4169         struct console_font font = {.width = op->width, .height = op->height};
4170         char name[MAX_FONT_NAME];
4171         char *s = name;
4172         int rc;
4173
4174
4175         if (!op->data)
4176                 s = NULL;
4177         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4178                 return -EFAULT;
4179         else
4180                 name[MAX_FONT_NAME - 1] = 0;
4181
4182         console_lock();
4183         if (vc->vc_mode != KD_TEXT) {
4184                 console_unlock();
4185                 return -EINVAL;
4186         }
4187         if (vc->vc_sw->con_font_default)
4188                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4189         else
4190                 rc = -ENOSYS;
4191         console_unlock();
4192         if (!rc) {
4193                 op->width = font.width;
4194                 op->height = font.height;
4195         }
4196         return rc;
4197 }
4198
4199 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4200 {
4201         int con = op->height;
4202         int rc;
4203
4204
4205         console_lock();
4206         if (vc->vc_mode != KD_TEXT)
4207                 rc = -EINVAL;
4208         else if (!vc->vc_sw->con_font_copy)
4209                 rc = -ENOSYS;
4210         else if (con < 0 || !vc_cons_allocated(con))
4211                 rc = -ENOTTY;
4212         else if (con == vc->vc_num)     /* nothing to do */
4213                 rc = 0;
4214         else
4215                 rc = vc->vc_sw->con_font_copy(vc, con);
4216         console_unlock();
4217         return rc;
4218 }
4219
4220 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4221 {
4222         switch (op->op) {
4223         case KD_FONT_OP_SET:
4224                 return con_font_set(vc, op);
4225         case KD_FONT_OP_GET:
4226                 return con_font_get(vc, op);
4227         case KD_FONT_OP_SET_DEFAULT:
4228                 return con_font_default(vc, op);
4229         case KD_FONT_OP_COPY:
4230                 return con_font_copy(vc, op);
4231         }
4232         return -ENOSYS;
4233 }
4234
4235 /*
4236  *      Interface exported to selection and vcs.
4237  */
4238
4239 /* used by selection */
4240 u16 screen_glyph(struct vc_data *vc, int offset)
4241 {
4242         u16 w = scr_readw(screenpos(vc, offset, 1));
4243         u16 c = w & 0xff;
4244
4245         if (w & vc->vc_hi_font_mask)
4246                 c |= 0x100;
4247         return c;
4248 }
4249 EXPORT_SYMBOL_GPL(screen_glyph);
4250
4251 /* used by vcs - note the word offset */
4252 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4253 {
4254         return screenpos(vc, 2 * w_offset, viewed);
4255 }
4256 EXPORT_SYMBOL_GPL(screen_pos);
4257
4258 void getconsxy(struct vc_data *vc, unsigned char *p)
4259 {
4260         p[0] = vc->vc_x;
4261         p[1] = vc->vc_y;
4262 }
4263
4264 void putconsxy(struct vc_data *vc, unsigned char *p)
4265 {
4266         hide_cursor(vc);
4267         gotoxy(vc, p[0], p[1]);
4268         set_cursor(vc);
4269 }
4270
4271 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4272 {
4273         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4274                 return softcursor_original;
4275         return scr_readw(org);
4276 }
4277
4278 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4279 {
4280         scr_writew(val, org);
4281         if ((unsigned long)org == vc->vc_pos) {
4282                 softcursor_original = -1;
4283                 add_softcursor(vc);
4284         }
4285 }
4286
4287 void vcs_scr_updated(struct vc_data *vc)
4288 {
4289         notify_update(vc);
4290 }
4291
4292 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4293                 unsigned int rolled_over, void *base, unsigned int size)
4294 {
4295         unsigned long ubase = (unsigned long)base;
4296         ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4297         ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4298         ptrdiff_t origin = (void *)c->vc_origin - base;
4299         int margin = c->vc_size_row * 4;
4300         int from, wrap, from_off, avail;
4301
4302         /* Turn scrollback off */
4303         if (!lines) {
4304                 c->vc_visible_origin = c->vc_origin;
4305                 return;
4306         }
4307
4308         /* Do we have already enough to allow jumping from 0 to the end? */
4309         if (rolled_over > scr_end + margin) {
4310                 from = scr_end;
4311                 wrap = rolled_over + c->vc_size_row;
4312         } else {
4313                 from = 0;
4314                 wrap = size;
4315         }
4316
4317         from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4318         avail = (origin - from + wrap) % wrap;
4319
4320         /* Only a little piece would be left? Show all incl. the piece! */
4321         if (avail < 2 * margin)
4322                 margin = 0;
4323         if (from_off < margin)
4324                 from_off = 0;
4325         if (from_off > avail - margin)
4326                 from_off = avail;
4327
4328         c->vc_visible_origin = ubase + (from + from_off) % wrap;
4329 }
4330 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4331
4332 /*
4333  *      Visible symbols for modules
4334  */
4335
4336 EXPORT_SYMBOL(color_table);
4337 EXPORT_SYMBOL(default_red);
4338 EXPORT_SYMBOL(default_grn);
4339 EXPORT_SYMBOL(default_blu);
4340 EXPORT_SYMBOL(update_region);
4341 EXPORT_SYMBOL(redraw_screen);
4342 EXPORT_SYMBOL(vc_resize);
4343 EXPORT_SYMBOL(fg_console);
4344 EXPORT_SYMBOL(console_blank_hook);
4345 EXPORT_SYMBOL(console_blanked);
4346 EXPORT_SYMBOL(vc_cons);
4347 EXPORT_SYMBOL(global_cursor_default);
4348 #ifndef VT_SINGLE_DRIVER
4349 EXPORT_SYMBOL(give_up_console);
4350 #endif