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 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 281 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 282
 283 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 284 {
 285         unsigned short *p;
 286
 287         if (!viewed)
 288                 p = (unsigned short *)(vc->vc_origin + offset);
 289         else if (!vc->vc_sw->con_screen_pos)
 290                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 291         else
 292                 p = vc->vc_sw->con_screen_pos(vc, offset);
 293         return p;
 294 }
 295
 296 /* Called  from the keyboard irq path.. */
 297 static inline void scrolldelta(int lines)
 298 {
 299         /* FIXME */
 300         /* scrolldelta needs some kind of consistency lock, but the BKL was
 301            and still is not protecting versus the scheduled back end */
 302         scrollback_delta += lines;
 303         schedule_console_callback();
 304 }
 305
 306 void schedule_console_callback(void)
 307 {
 308         schedule_work(&console_work);
 309 }
 310
 311 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 312 {
 313         unsigned short *d, *s;
 314
 315         if (t+nr >= b)
 316                 nr = b - t - 1;
 317         if (b > vc->vc_rows || t >= b || nr < 1)
 318                 return;
 319         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 320                 return;
 321         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 322         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 323         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 324         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 325                     vc->vc_size_row * nr);
 326 }
 327
 328 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 329 {
 330         unsigned short *s;
 331         unsigned int step;
 332
 333         if (t+nr >= b)
 334                 nr = b - t - 1;
 335         if (b > vc->vc_rows || t >= b || nr < 1)
 336                 return;
 337         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 338                 return;
 339         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 340         step = vc->vc_cols * nr;
 341         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 342         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 343 }
 344
 345 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 346 {
 347         unsigned int xx, yy, offset;
 348         u16 *p;
 349
 350         p = (u16 *) start;
 351         if (!vc->vc_sw->con_getxy) {
 352                 offset = (start - vc->vc_origin) / 2;
 353                 xx = offset % vc->vc_cols;
 354                 yy = offset / vc->vc_cols;
 355         } else {
 356                 int nxx, nyy;
 357                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 358                 xx = nxx; yy = nyy;
 359         }
 360         for(;;) {
 361                 u16 attrib = scr_readw(p) & 0xff00;
 362                 int startx = xx;
 363                 u16 *q = p;
 364                 while (xx < vc->vc_cols && count) {
 365                         if (attrib != (scr_readw(p) & 0xff00)) {
 366                                 if (p > q)
 367                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 368                                 startx = xx;
 369                                 q = p;
 370                                 attrib = scr_readw(p) & 0xff00;
 371                         }
 372                         p++;
 373                         xx++;
 374                         count--;
 375                 }
 376                 if (p > q)
 377                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 378                 if (!count)
 379                         break;
 380                 xx = 0;
 381                 yy++;
 382                 if (vc->vc_sw->con_getxy) {
 383                         p = (u16 *)start;
 384                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 385                 }
 386         }
 387 }
 388
 389 void update_region(struct vc_data *vc, unsigned long start, int count)
 390 {
 391         WARN_CONSOLE_UNLOCKED();
 392
 393         if (DO_UPDATE(vc)) {
 394                 hide_cursor(vc);
 395                 do_update_region(vc, start, count);
 396                 set_cursor(vc);
 397         }
 398 }
 399
 400 /* Structure of attributes is hardware-dependent */
 401
 402 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 403     u8 _underline, u8 _reverse, u8 _italic)
 404 {
 405         if (vc->vc_sw->con_build_attr)
 406                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 407                        _blink, _underline, _reverse, _italic);
 408
 409 /*
 410  * ++roman: I completely changed the attribute format for monochrome
 411  * mode (!can_do_color). The formerly used MDA (monochrome display
 412  * adapter) format didn't allow the combination of certain effects.
 413  * Now the attribute is just a bit vector:
 414  *  Bit 0..1: intensity (0..2)
 415  *  Bit 2   : underline
 416  *  Bit 3   : reverse
 417  *  Bit 7   : blink
 418  */
 419         {
 420         u8 a = _color;
 421         if (!vc->vc_can_do_color)
 422                 return _intensity |
 423                        (_italic ? 2 : 0) |
 424                        (_underline ? 4 : 0) |
 425                        (_reverse ? 8 : 0) |
 426                        (_blink ? 0x80 : 0);
 427         if (_italic)
 428                 a = (a & 0xF0) | vc->vc_itcolor;
 429         else if (_underline)
 430                 a = (a & 0xf0) | vc->vc_ulcolor;
 431         else if (_intensity == 0)
 432                 a = (a & 0xf0) | vc->vc_ulcolor;
 433         if (_reverse)
 434                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 435         if (_blink)
 436                 a ^= 0x80;
 437         if (_intensity == 2)
 438                 a ^= 0x08;
 439         if (vc->vc_hi_font_mask == 0x100)
 440                 a <<= 1;
 441         return a;
 442         }
 443 }
 444
 445 static void update_attr(struct vc_data *vc)
 446 {
 447         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 448                       vc->vc_blink, vc->vc_underline,
 449                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 450         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 451 }
 452
 453 /* Note: inverting the screen twice should revert to the original state */
 454 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 455 {
 456         unsigned short *p;
 457
 458         WARN_CONSOLE_UNLOCKED();
 459
 460         count /= 2;
 461         p = screenpos(vc, offset, viewed);
 462         if (vc->vc_sw->con_invert_region) {
 463                 vc->vc_sw->con_invert_region(vc, p, count);
 464         } else {
 465                 u16 *q = p;
 466                 int cnt = count;
 467                 u16 a;
 468
 469                 if (!vc->vc_can_do_color) {
 470                         while (cnt--) {
 471                             a = scr_readw(q);
 472                             a ^= 0x0800;
 473                             scr_writew(a, q);
 474                             q++;
 475                         }
 476                 } else if (vc->vc_hi_font_mask == 0x100) {
 477                         while (cnt--) {
 478                                 a = scr_readw(q);
 479                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 480                                 scr_writew(a, q);
 481                                 q++;
 482                         }
 483                 } else {
 484                         while (cnt--) {
 485                                 a = scr_readw(q);
 486                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 487                                 scr_writew(a, q);
 488                                 q++;
 489                         }
 490                 }
 491         }
 492
 493         if (DO_UPDATE(vc))
 494                 do_update_region(vc, (unsigned long) p, count);
 495         notify_update(vc);
 496 }
 497
 498 /* used by selection: complement pointer position */
 499 void complement_pos(struct vc_data *vc, int offset)
 500 {
 501         static int old_offset = -1;
 502         static unsigned short old;
 503         static unsigned short oldx, oldy;
 504
 505         WARN_CONSOLE_UNLOCKED();
 506
 507         if (old_offset != -1 && old_offset >= 0 &&
 508             old_offset < vc->vc_screenbuf_size) {
 509                 scr_writew(old, screenpos(vc, old_offset, 1));
 510                 if (DO_UPDATE(vc))
 511                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 512                 notify_update(vc);
 513         }
 514
 515         old_offset = offset;
 516
 517         if (offset != -1 && offset >= 0 &&
 518             offset < vc->vc_screenbuf_size) {
 519                 unsigned short new;
 520                 unsigned short *p;
 521                 p = screenpos(vc, offset, 1);
 522                 old = scr_readw(p);
 523                 new = old ^ vc->vc_complement_mask;
 524                 scr_writew(new, p);
 525                 if (DO_UPDATE(vc)) {
 526                         oldx = (offset >> 1) % vc->vc_cols;
 527                         oldy = (offset >> 1) / vc->vc_cols;
 528                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 529                 }
 530                 notify_update(vc);
 531         }
 532 }
 533
 534 static void insert_char(struct vc_data *vc, unsigned int nr)
 535 {
 536         unsigned short *p = (unsigned short *) vc->vc_pos;
 537
 538         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 539         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 540         vc->vc_need_wrap = 0;
 541         if (DO_UPDATE(vc))
 542                 do_update_region(vc, (unsigned long) p,
 543                         vc->vc_cols - vc->vc_x);
 544 }
 545
 546 static void delete_char(struct vc_data *vc, unsigned int nr)
 547 {
 548         unsigned short *p = (unsigned short *) vc->vc_pos;
 549
 550         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 551         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 552                         nr * 2);
 553         vc->vc_need_wrap = 0;
 554         if (DO_UPDATE(vc))
 555                 do_update_region(vc, (unsigned long) p,
 556                         vc->vc_cols - vc->vc_x);
 557 }
 558
 559 static int softcursor_original = -1;
 560
 561 static void add_softcursor(struct vc_data *vc)
 562 {
 563         int i = scr_readw((u16 *) vc->vc_pos);
 564         u32 type = vc->vc_cursor_type;
 565
 566         if (! (type & 0x10)) return;
 567         if (softcursor_original != -1) return;
 568         softcursor_original = i;
 569         i |= ((type >> 8) & 0xff00 );
 570         i ^= ((type) & 0xff00 );
 571         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 572         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 573         scr_writew(i, (u16 *) vc->vc_pos);
 574         if (DO_UPDATE(vc))
 575                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 576 }
 577
 578 static void hide_softcursor(struct vc_data *vc)
 579 {
 580         if (softcursor_original != -1) {
 581                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 582                 if (DO_UPDATE(vc))
 583                         vc->vc_sw->con_putc(vc, softcursor_original,
 584                                         vc->vc_y, vc->vc_x);
 585                 softcursor_original = -1;
 586         }
 587 }
 588
 589 static void hide_cursor(struct vc_data *vc)
 590 {
 591         if (vc == sel_cons)
 592                 clear_selection();
 593         vc->vc_sw->con_cursor(vc, CM_ERASE);
 594         hide_softcursor(vc);
 595 }
 596
 597 static void set_cursor(struct vc_data *vc)
 598 {
 599         if (!IS_FG(vc) || console_blanked ||
 600             vc->vc_mode == KD_GRAPHICS)
 601                 return;
 602         if (vc->vc_deccm) {
 603                 if (vc == sel_cons)
 604                         clear_selection();
 605                 add_softcursor(vc);
 606                 if ((vc->vc_cursor_type & 0x0f) != 1)
 607                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 608         } else
 609                 hide_cursor(vc);
 610 }
 611
 612 static void set_origin(struct vc_data *vc)
 613 {
 614         WARN_CONSOLE_UNLOCKED();
 615
 616         if (!CON_IS_VISIBLE(vc) ||
 617             !vc->vc_sw->con_set_origin ||
 618             !vc->vc_sw->con_set_origin(vc))
 619                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 620         vc->vc_visible_origin = vc->vc_origin;
 621         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 622         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 623 }
 624
 625 static void save_screen(struct vc_data *vc)
 626 {
 627         WARN_CONSOLE_UNLOCKED();
 628
 629         if (vc->vc_sw->con_save_screen)
 630                 vc->vc_sw->con_save_screen(vc);
 631 }
 632
 633 /*
 634  *      Redrawing of screen
 635  */
 636
 637 void clear_buffer_attributes(struct vc_data *vc)
 638 {
 639         unsigned short *p = (unsigned short *)vc->vc_origin;
 640         int count = vc->vc_screenbuf_size / 2;
 641         int mask = vc->vc_hi_font_mask | 0xff;
 642
 643         for (; count > 0; count--, p++) {
 644                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 645         }
 646 }
 647
 648 void redraw_screen(struct vc_data *vc, int is_switch)
 649 {
 650         int redraw = 0;
 651
 652         WARN_CONSOLE_UNLOCKED();
 653
 654         if (!vc) {
 655                 /* strange ... */
 656                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 657                 return;
 658         }
 659
 660         if (is_switch) {
 661                 struct vc_data *old_vc = vc_cons[fg_console].d;
 662                 if (old_vc == vc)
 663                         return;
 664                 if (!CON_IS_VISIBLE(vc))
 665                         redraw = 1;
 666                 *vc->vc_display_fg = vc;
 667                 fg_console = vc->vc_num;
 668                 hide_cursor(old_vc);
 669                 if (!CON_IS_VISIBLE(old_vc)) {
 670                         save_screen(old_vc);
 671                         set_origin(old_vc);
 672                 }
 673                 if (tty0dev)
 674                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 675         } else {
 676                 hide_cursor(vc);
 677                 redraw = 1;
 678         }
 679
 680         if (redraw) {
 681                 int update;
 682                 int old_was_color = vc->vc_can_do_color;
 683
 684                 set_origin(vc);
 685                 update = vc->vc_sw->con_switch(vc);
 686                 set_palette(vc);
 687                 /*
 688                  * If console changed from mono<->color, the best we can do
 689                  * is to clear the buffer attributes. As it currently stands,
 690                  * rebuilding new attributes from the old buffer is not doable
 691                  * without overly complex code.
 692                  */
 693                 if (old_was_color != vc->vc_can_do_color) {
 694                         update_attr(vc);
 695                         clear_buffer_attributes(vc);
 696                 }
 697
 698                 /* Forcibly update if we're panicing */
 699                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 700                     vt_force_oops_output(vc))
 701                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 702         }
 703         set_cursor(vc);
 704         if (is_switch) {
 705                 set_leds();
 706                 compute_shiftstate();
 707                 notify_update(vc);
 708         }
 709 }
 710
 711 /*
 712  *      Allocation, freeing and resizing of VTs.
 713  */
 714
 715 int vc_cons_allocated(unsigned int i)
 716 {
 717         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 718 }
 719
 720 static void visual_init(struct vc_data *vc, int num, int init)
 721 {
 722         /* ++Geert: vc->vc_sw->con_init determines console size */
 723         if (vc->vc_sw)
 724                 module_put(vc->vc_sw->owner);
 725         vc->vc_sw = conswitchp;
 726 #ifndef VT_SINGLE_DRIVER
 727         if (con_driver_map[num])
 728                 vc->vc_sw = con_driver_map[num];
 729 #endif
 730         __module_get(vc->vc_sw->owner);
 731         vc->vc_num = num;
 732         vc->vc_display_fg = &master_display_fg;
 733         if (vc->vc_uni_pagedir_loc)
 734                 con_free_unimap(vc);
 735         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 736         vc->vc_uni_pagedir = NULL;
 737         vc->vc_hi_font_mask = 0;
 738         vc->vc_complement_mask = 0;
 739         vc->vc_can_do_color = 0;
 740         vc->vc_panic_force_write = false;
 741         vc->vc_sw->con_init(vc, init);
 742         if (!vc->vc_complement_mask)
 743                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 744         vc->vc_s_complement_mask = vc->vc_complement_mask;
 745         vc->vc_size_row = vc->vc_cols << 1;
 746         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 747 }
 748
 749 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 750 {
 751         struct vt_notifier_param param;
 752         struct vc_data *vc;
 753
 754         WARN_CONSOLE_UNLOCKED();
 755
 756         if (currcons >= MAX_NR_CONSOLES)
 757                 return -ENXIO;
 758
 759         if (vc_cons[currcons].d)
 760                 return 0;
 761
 762         /* due to the granularity of kmalloc, we waste some memory here */
 763         /* the alloc is done in two steps, to optimize the common situation
 764            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 765         /* although the numbers above are not valid since long ago, the
 766            point is still up-to-date and the comment still has its value
 767            even if only as a historical artifact.  --mj, July 1998 */
 768         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 769         if (!vc)
 770                 return -ENOMEM;
 771
 772         vc_cons[currcons].d = vc;
 773         tty_port_init(&vc->port);
 774         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 775
 776         visual_init(vc, currcons, 1);
 777
 778         if (!*vc->vc_uni_pagedir_loc)
 779                 con_set_default_unimap(vc);
 780
 781         vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 782         if (!vc->vc_screenbuf)
 783                 goto err_free;
 784
 785         /* If no drivers have overridden us and the user didn't pass a
 786            boot option, default to displaying the cursor */
 787         if (global_cursor_default == -1)
 788                 global_cursor_default = 1;
 789
 790         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 791         vcs_make_sysfs(currcons);
 792         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 793
 794         return 0;
 795 err_free:
 796         kfree(vc);
 797         vc_cons[currcons].d = NULL;
 798         return -ENOMEM;
 799 }
 800
 801 static inline int resize_screen(struct vc_data *vc, int width, int height,
 802                                 int user)
 803 {
 804         /* Resizes the resolution of the display adapater */
 805         int err = 0;
 806
 807         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 808                 err = vc->vc_sw->con_resize(vc, width, height, user);
 809
 810         return err;
 811 }
 812
 813 /*
 814  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 815  * [this is to be used together with some user program
 816  * like resize that changes the hardware videomode]
 817  */
 818 #define VC_RESIZE_MAXCOL (32767)
 819 #define VC_RESIZE_MAXROW (32767)
 820
 821 /**
 822  *      vc_do_resize    -       resizing method for the tty
 823  *      @tty: tty being resized
 824  *      @real_tty: real tty (different to tty if a pty/tty pair)
 825  *      @vc: virtual console private data
 826  *      @cols: columns
 827  *      @lines: lines
 828  *
 829  *      Resize a virtual console, clipping according to the actual constraints.
 830  *      If the caller passes a tty structure then update the termios winsize
 831  *      information and perform any necessary signal handling.
 832  *
 833  *      Caller must hold the console semaphore. Takes the termios rwsem and
 834  *      ctrl_lock of the tty IFF a tty is passed.
 835  */
 836
 837 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 838                                 unsigned int cols, unsigned int lines)
 839 {
 840         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 841         unsigned long end;
 842         unsigned int old_rows, old_row_size;
 843         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 844         unsigned int user;
 845         unsigned short *newscreen;
 846
 847         WARN_CONSOLE_UNLOCKED();
 848
 849         if (!vc)
 850                 return -ENXIO;
 851
 852         user = vc->vc_resize_user;
 853         vc->vc_resize_user = 0;
 854
 855         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 856                 return -EINVAL;
 857
 858         new_cols = (cols ? cols : vc->vc_cols);
 859         new_rows = (lines ? lines : vc->vc_rows);
 860         new_row_size = new_cols << 1;
 861         new_screen_size = new_row_size * new_rows;
 862
 863         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 864                 return 0;
 865
 866         newscreen = kmalloc(new_screen_size, GFP_USER);
 867         if (!newscreen)
 868                 return -ENOMEM;
 869
 870         old_rows = vc->vc_rows;
 871         old_row_size = vc->vc_size_row;
 872
 873         err = resize_screen(vc, new_cols, new_rows, user);
 874         if (err) {
 875                 kfree(newscreen);
 876                 return err;
 877         }
 878
 879         vc->vc_rows = new_rows;
 880         vc->vc_cols = new_cols;
 881         vc->vc_size_row = new_row_size;
 882         vc->vc_screenbuf_size = new_screen_size;
 883
 884         rlth = min(old_row_size, new_row_size);
 885         rrem = new_row_size - rlth;
 886         old_origin = vc->vc_origin;
 887         new_origin = (long) newscreen;
 888         new_scr_end = new_origin + new_screen_size;
 889
 890         if (vc->vc_y > new_rows) {
 891                 if (old_rows - vc->vc_y < new_rows) {
 892                         /*
 893                          * Cursor near the bottom, copy contents from the
 894                          * bottom of buffer
 895                          */
 896                         old_origin += (old_rows - new_rows) * old_row_size;
 897                 } else {
 898                         /*
 899                          * Cursor is in no man's land, copy 1/2 screenful
 900                          * from the top and bottom of cursor position
 901                          */
 902                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 903                 }
 904         }
 905
 906         end = old_origin + old_row_size * min(old_rows, new_rows);
 907
 908         update_attr(vc);
 909
 910         while (old_origin < end) {
 911                 scr_memcpyw((unsigned short *) new_origin,
 912                             (unsigned short *) old_origin, rlth);
 913                 if (rrem)
 914                         scr_memsetw((void *)(new_origin + rlth),
 915                                     vc->vc_video_erase_char, rrem);
 916                 old_origin += old_row_size;
 917                 new_origin += new_row_size;
 918         }
 919         if (new_scr_end > new_origin)
 920                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 921                             new_scr_end - new_origin);
 922         kfree(vc->vc_screenbuf);
 923         vc->vc_screenbuf = newscreen;
 924         vc->vc_screenbuf_size = new_screen_size;
 925         set_origin(vc);
 926
 927         /* do part of a reset_terminal() */
 928         vc->vc_top = 0;
 929         vc->vc_bottom = vc->vc_rows;
 930         gotoxy(vc, vc->vc_x, vc->vc_y);
 931         save_cur(vc);
 932
 933         if (tty) {
 934                 /* Rewrite the requested winsize data with the actual
 935                    resulting sizes */
 936                 struct winsize ws;
 937                 memset(&ws, 0, sizeof(ws));
 938                 ws.ws_row = vc->vc_rows;
 939                 ws.ws_col = vc->vc_cols;
 940                 ws.ws_ypixel = vc->vc_scan_lines;
 941                 tty_do_resize(tty, &ws);
 942         }
 943
 944         if (CON_IS_VISIBLE(vc))
 945                 update_screen(vc);
 946         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 947         return err;
 948 }
 949
 950 /**
 951  *      vc_resize               -       resize a VT
 952  *      @vc: virtual console
 953  *      @cols: columns
 954  *      @rows: rows
 955  *
 956  *      Resize a virtual console as seen from the console end of things. We
 957  *      use the common vc_do_resize methods to update the structures. The
 958  *      caller must hold the console sem to protect console internals and
 959  *      vc->port.tty
 960  */
 961
 962 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 963 {
 964         return vc_do_resize(vc->port.tty, vc, cols, rows);
 965 }
 966
 967 /**
 968  *      vt_resize               -       resize a VT
 969  *      @tty: tty to resize
 970  *      @ws: winsize attributes
 971  *
 972  *      Resize a virtual terminal. This is called by the tty layer as we
 973  *      register our own handler for resizing. The mutual helper does all
 974  *      the actual work.
 975  *
 976  *      Takes the console sem and the called methods then take the tty
 977  *      termios_rwsem and the tty ctrl_lock in that order.
 978  */
 979 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 980 {
 981         struct vc_data *vc = tty->driver_data;
 982         int ret;
 983
 984         console_lock();
 985         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 986         console_unlock();
 987         return ret;
 988 }
 989
 990 struct vc_data *vc_deallocate(unsigned int currcons)
 991 {
 992         struct vc_data *vc = NULL;
 993
 994         WARN_CONSOLE_UNLOCKED();
 995
 996         if (vc_cons_allocated(currcons)) {
 997                 struct vt_notifier_param param;
 998
 999                 param.vc = vc = vc_cons[currcons].d;
1000                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1001                 vcs_remove_sysfs(currcons);
1002                 vc->vc_sw->con_deinit(vc);
1003                 put_pid(vc->vt_pid);
1004                 module_put(vc->vc_sw->owner);
1005                 kfree(vc->vc_screenbuf);
1006                 vc_cons[currcons].d = NULL;
1007         }
1008         return vc;
1009 }
1010
1011 /*
1012  *      VT102 emulator
1013  */
1014
1015 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1016 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1017 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1018
1019 #define decarm          VC_REPEAT
1020 #define decckm          VC_CKMODE
1021 #define kbdapplic       VC_APPLIC
1022 #define lnm             VC_CRLF
1023
1024 /*
1025  * this is what the terminal answers to a ESC-Z or csi0c query.
1026  */
1027 #define VT100ID "\033[?1;2c"
1028 #define VT102ID "\033[?6c"
1029
1030 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1031                                        8,12,10,14, 9,13,11,15 };
1032
1033 /* the default colour table, for VGA+ colour systems */
1034 unsigned char default_red[] = {
1035         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1036         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1037 };
1038 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1039
1040 unsigned char default_grn[] = {
1041         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1042         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1043 };
1044 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1045
1046 unsigned char default_blu[] = {
1047         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1048         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1049 };
1050 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1051
1052 /*
1053  * gotoxy() must verify all boundaries, because the arguments
1054  * might also be negative. If the given position is out of
1055  * bounds, the cursor is placed at the nearest margin.
1056  */
1057 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1058 {
1059         int min_y, max_y;
1060
1061         if (new_x < 0)
1062                 vc->vc_x = 0;
1063         else {
1064                 if (new_x >= vc->vc_cols)
1065                         vc->vc_x = vc->vc_cols - 1;
1066                 else
1067                         vc->vc_x = new_x;
1068         }
1069
1070         if (vc->vc_decom) {
1071                 min_y = vc->vc_top;
1072                 max_y = vc->vc_bottom;
1073         } else {
1074                 min_y = 0;
1075                 max_y = vc->vc_rows;
1076         }
1077         if (new_y < min_y)
1078                 vc->vc_y = min_y;
1079         else if (new_y >= max_y)
1080                 vc->vc_y = max_y - 1;
1081         else
1082                 vc->vc_y = new_y;
1083         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1084         vc->vc_need_wrap = 0;
1085 }
1086
1087 /* for absolute user moves, when decom is set */
1088 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1089 {
1090         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1091 }
1092
1093 void scrollback(struct vc_data *vc)
1094 {
1095         scrolldelta(-(vc->vc_rows / 2));
1096 }
1097
1098 void scrollfront(struct vc_data *vc, int lines)
1099 {
1100         if (!lines)
1101                 lines = vc->vc_rows / 2;
1102         scrolldelta(lines);
1103 }
1104
1105 static void lf(struct vc_data *vc)
1106 {
1107         /* don't scroll if above bottom of scrolling region, or
1108          * if below scrolling region
1109          */
1110         if (vc->vc_y + 1 == vc->vc_bottom)
1111                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1112         else if (vc->vc_y < vc->vc_rows - 1) {
1113                 vc->vc_y++;
1114                 vc->vc_pos += vc->vc_size_row;
1115         }
1116         vc->vc_need_wrap = 0;
1117         notify_write(vc, '\n');
1118 }
1119
1120 static void ri(struct vc_data *vc)
1121 {
1122         /* don't scroll if below top of scrolling region, or
1123          * if above scrolling region
1124          */
1125         if (vc->vc_y == vc->vc_top)
1126                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1127         else if (vc->vc_y > 0) {
1128                 vc->vc_y--;
1129                 vc->vc_pos -= vc->vc_size_row;
1130         }
1131         vc->vc_need_wrap = 0;
1132 }
1133
1134 static inline void cr(struct vc_data *vc)
1135 {
1136         vc->vc_pos -= vc->vc_x << 1;
1137         vc->vc_need_wrap = vc->vc_x = 0;
1138         notify_write(vc, '\r');
1139 }
1140
1141 static inline void bs(struct vc_data *vc)
1142 {
1143         if (vc->vc_x) {
1144                 vc->vc_pos -= 2;
1145                 vc->vc_x--;
1146                 vc->vc_need_wrap = 0;
1147                 notify_write(vc, '\b');
1148         }
1149 }
1150
1151 static inline void del(struct vc_data *vc)
1152 {
1153         /* ignored */
1154 }
1155
1156 static void csi_J(struct vc_data *vc, int vpar)
1157 {
1158         unsigned int count;
1159         unsigned short * start;
1160
1161         switch (vpar) {
1162                 case 0: /* erase from cursor to end of display */
1163                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1164                         start = (unsigned short *)vc->vc_pos;
1165                         break;
1166                 case 1: /* erase from start to cursor */
1167                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1168                         start = (unsigned short *)vc->vc_origin;
1169                         break;
1170                 case 3: /* erase scroll-back buffer (and whole display) */
1171                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1172                                     vc->vc_screenbuf_size >> 1);
1173                         set_origin(vc);
1174                         if (CON_IS_VISIBLE(vc))
1175                                 update_screen(vc);
1176                         /* fall through */
1177                 case 2: /* erase whole display */
1178                         count = vc->vc_cols * vc->vc_rows;
1179                         start = (unsigned short *)vc->vc_origin;
1180                         break;
1181                 default:
1182                         return;
1183         }
1184         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1185         if (DO_UPDATE(vc))
1186                 do_update_region(vc, (unsigned long) start, count);
1187         vc->vc_need_wrap = 0;
1188 }
1189
1190 static void csi_K(struct vc_data *vc, int vpar)
1191 {
1192         unsigned int count;
1193         unsigned short * start;
1194
1195         switch (vpar) {
1196                 case 0: /* erase from cursor to end of line */
1197                         count = vc->vc_cols - vc->vc_x;
1198                         start = (unsigned short *)vc->vc_pos;
1199                         break;
1200                 case 1: /* erase from start of line to cursor */
1201                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1202                         count = vc->vc_x + 1;
1203                         break;
1204                 case 2: /* erase whole line */
1205                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1206                         count = vc->vc_cols;
1207                         break;
1208                 default:
1209                         return;
1210         }
1211         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1212         vc->vc_need_wrap = 0;
1213         if (DO_UPDATE(vc))
1214                 do_update_region(vc, (unsigned long) start, count);
1215 }
1216
1217 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1218 {                                         /* not vt100? */
1219         int count;
1220
1221         if (!vpar)
1222                 vpar++;
1223         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1224
1225         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1226         if (DO_UPDATE(vc))
1227                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1228         vc->vc_need_wrap = 0;
1229 }
1230
1231 static void default_attr(struct vc_data *vc)
1232 {
1233         vc->vc_intensity = 1;
1234         vc->vc_italic = 0;
1235         vc->vc_underline = 0;
1236         vc->vc_reverse = 0;
1237         vc->vc_blink = 0;
1238         vc->vc_color = vc->vc_def_color;
1239 }
1240
1241 struct rgb { u8 r; u8 g; u8 b; };
1242
1243 static void rgb_from_256(int i, struct rgb *c)
1244 {
1245         if (i < 8) {            /* Standard colours. */
1246                 c->r = i&1 ? 0xaa : 0x00;
1247                 c->g = i&2 ? 0xaa : 0x00;
1248                 c->b = i&4 ? 0xaa : 0x00;
1249         } else if (i < 16) {
1250                 c->r = i&1 ? 0xff : 0x55;
1251                 c->g = i&2 ? 0xff : 0x55;
1252                 c->b = i&4 ? 0xff : 0x55;
1253         } else if (i < 232) {   /* 6x6x6 colour cube. */
1254                 c->r = (i - 16) / 36 * 85 / 2;
1255                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1256                 c->b = (i - 16) % 6 * 85 / 2;
1257         } else                  /* Grayscale ramp. */
1258                 c->r = c->g = c->b = i * 10 - 2312;
1259 }
1260
1261 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1262 {
1263         u8 hue = 0, max = max3(c->r, c->g, c->b);
1264
1265         if (c->r > max / 2)
1266                 hue |= 4;
1267         if (c->g > max / 2)
1268                 hue |= 2;
1269         if (c->b > max / 2)
1270                 hue |= 1;
1271
1272         if (hue == 7 && max <= 0x55) {
1273                 hue = 0;
1274                 vc->vc_intensity = 2;
1275         } else if (max > 0xaa)
1276                 vc->vc_intensity = 2;
1277         else
1278                 vc->vc_intensity = 1;
1279
1280         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1281 }
1282
1283 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1284 {
1285         /* For backgrounds, err on the dark side. */
1286         vc->vc_color = (vc->vc_color & 0x0f)
1287                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1288 }
1289
1290 /*
1291  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1292  * and thus need to be detected and ignored by hand. Strictly speaking, that
1293  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1294  * no one produces such codes and almost no one accepts them.
1295  *
1296  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1297  * supporting them.
1298  */
1299 static int vc_t416_color(struct vc_data *vc, int i,
1300                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1301 {
1302         struct rgb c;
1303
1304         i++;
1305         if (i > vc->vc_npar)
1306                 return i;
1307
1308         if (vc->vc_par[i] == 5 && i < vc->vc_npar) {
1309                 /* 256 colours -- ubiquitous */
1310                 i++;
1311                 rgb_from_256(vc->vc_par[i], &c);
1312         } else if (vc->vc_par[i] == 2 && i <= vc->vc_npar + 3) {
1313                 /* 24 bit -- extremely rare */
1314                 c.r = vc->vc_par[i + 1];
1315                 c.g = vc->vc_par[i + 2];
1316                 c.b = vc->vc_par[i + 3];
1317                 i += 3;
1318         } else
1319                 return i;
1320
1321         set_color(vc, &c);
1322
1323         return i;
1324 }
1325
1326 /* console_lock is held */
1327 static void csi_m(struct vc_data *vc)
1328 {
1329         int i;
1330
1331         for (i = 0; i <= vc->vc_npar; i++)
1332                 switch (vc->vc_par[i]) {
1333                         case 0: /* all attributes off */
1334                                 default_attr(vc);
1335                                 break;
1336                         case 1:
1337                                 vc->vc_intensity = 2;
1338                                 break;
1339                         case 2:
1340                                 vc->vc_intensity = 0;
1341                                 break;
1342                         case 3:
1343                                 vc->vc_italic = 1;
1344                                 break;
1345                         case 4:
1346                                 vc->vc_underline = 1;
1347                                 break;
1348                         case 5:
1349                                 vc->vc_blink = 1;
1350                                 break;
1351                         case 7:
1352                                 vc->vc_reverse = 1;
1353                                 break;
1354                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1355                                   * Select primary font, don't display
1356                                   * control chars if defined, don't set
1357                                   * bit 8 on output.
1358                                   */
1359                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1360                                                 ? vc->vc_G0_charset
1361                                                 : vc->vc_G1_charset, vc);
1362                                 vc->vc_disp_ctrl = 0;
1363                                 vc->vc_toggle_meta = 0;
1364                                 break;
1365                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1366                                   * Select first alternate font, lets
1367                                   * chars < 32 be displayed as ROM chars.
1368                                   */
1369                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1370                                 vc->vc_disp_ctrl = 1;
1371                                 vc->vc_toggle_meta = 0;
1372                                 break;
1373                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1374                                   * Select second alternate font, toggle
1375                                   * high bit before displaying as ROM char.
1376                                   */
1377                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1378                                 vc->vc_disp_ctrl = 1;
1379                                 vc->vc_toggle_meta = 1;
1380                                 break;
1381                         case 21:
1382                         case 22:
1383                                 vc->vc_intensity = 1;
1384                                 break;
1385                         case 23:
1386                                 vc->vc_italic = 0;
1387                                 break;
1388                         case 24:
1389                                 vc->vc_underline = 0;
1390                                 break;
1391                         case 25:
1392                                 vc->vc_blink = 0;
1393                                 break;
1394                         case 27:
1395                                 vc->vc_reverse = 0;
1396                                 break;
1397                         case 38:
1398                                 i = vc_t416_color(vc, i, rgb_foreground);
1399                                 break;
1400                         case 48:
1401                                 i = vc_t416_color(vc, i, rgb_background);
1402                                 break;
1403                         case 39:
1404                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1405                                 break;
1406                         case 49:
1407                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1408                                 break;
1409                         default:
1410                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1411                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1412                                                 | (vc->vc_color & 0xf0);
1413                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1414                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1415                                                 | (vc->vc_color & 0x0f);
1416                                 break;
1417                 }
1418         update_attr(vc);
1419 }
1420
1421 static void respond_string(const char *p, struct tty_port *port)
1422 {
1423         while (*p) {
1424                 tty_insert_flip_char(port, *p, 0);
1425                 p++;
1426         }
1427         tty_schedule_flip(port);
1428 }
1429
1430 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1431 {
1432         char buf[40];
1433
1434         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1435         respond_string(buf, tty->port);
1436 }
1437
1438 static inline void status_report(struct tty_struct *tty)
1439 {
1440         respond_string("\033[0n", tty->port);   /* Terminal ok */
1441 }
1442
1443 static inline void respond_ID(struct tty_struct *tty)
1444 {
1445         respond_string(VT102ID, tty->port);
1446 }
1447
1448 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1449 {
1450         char buf[8];
1451
1452         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1453                 (char)('!' + mry));
1454         respond_string(buf, tty->port);
1455 }
1456
1457 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1458 int mouse_reporting(void)
1459 {
1460         return vc_cons[fg_console].d->vc_report_mouse;
1461 }
1462
1463 /* console_lock is held */
1464 static void set_mode(struct vc_data *vc, int on_off)
1465 {
1466         int i;
1467
1468         for (i = 0; i <= vc->vc_npar; i++)
1469                 if (vc->vc_ques) {
1470                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1471                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1472                                 if (on_off)
1473                                         set_kbd(vc, decckm);
1474                                 else
1475                                         clr_kbd(vc, decckm);
1476                                 break;
1477                         case 3: /* 80/132 mode switch unimplemented */
1478                                 vc->vc_deccolm = on_off;
1479 #if 0
1480                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1481                                 /* this alone does not suffice; some user mode
1482                                    utility has to change the hardware regs */
1483 #endif
1484                                 break;
1485                         case 5:                 /* Inverted screen on/off */
1486                                 if (vc->vc_decscnm != on_off) {
1487                                         vc->vc_decscnm = on_off;
1488                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1489                                         update_attr(vc);
1490                                 }
1491                                 break;
1492                         case 6:                 /* Origin relative/absolute */
1493                                 vc->vc_decom = on_off;
1494                                 gotoxay(vc, 0, 0);
1495                                 break;
1496                         case 7:                 /* Autowrap on/off */
1497                                 vc->vc_decawm = on_off;
1498                                 break;
1499                         case 8:                 /* Autorepeat on/off */
1500                                 if (on_off)
1501                                         set_kbd(vc, decarm);
1502                                 else
1503                                         clr_kbd(vc, decarm);
1504                                 break;
1505                         case 9:
1506                                 vc->vc_report_mouse = on_off ? 1 : 0;
1507                                 break;
1508                         case 25:                /* Cursor on/off */
1509                                 vc->vc_deccm = on_off;
1510                                 break;
1511                         case 1000:
1512                                 vc->vc_report_mouse = on_off ? 2 : 0;
1513                                 break;
1514                         }
1515                 } else {
1516                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1517                         case 3:                 /* Monitor (display ctrls) */
1518                                 vc->vc_disp_ctrl = on_off;
1519                                 break;
1520                         case 4:                 /* Insert Mode on/off */
1521                                 vc->vc_decim = on_off;
1522                                 break;
1523                         case 20:                /* Lf, Enter == CrLf/Lf */
1524                                 if (on_off)
1525                                         set_kbd(vc, lnm);
1526                                 else
1527                                         clr_kbd(vc, lnm);
1528                                 break;
1529                         }
1530                 }
1531 }
1532
1533 /* console_lock is held */
1534 static void setterm_command(struct vc_data *vc)
1535 {
1536         switch(vc->vc_par[0]) {
1537                 case 1: /* set color for underline mode */
1538                         if (vc->vc_can_do_color &&
1539                                         vc->vc_par[1] < 16) {
1540                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1541                                 if (vc->vc_underline)
1542                                         update_attr(vc);
1543                         }
1544                         break;
1545                 case 2: /* set color for half intensity mode */
1546                         if (vc->vc_can_do_color &&
1547                                         vc->vc_par[1] < 16) {
1548                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1549                                 if (vc->vc_intensity == 0)
1550                                         update_attr(vc);
1551                         }
1552                         break;
1553                 case 8: /* store colors as defaults */
1554                         vc->vc_def_color = vc->vc_attr;
1555                         if (vc->vc_hi_font_mask == 0x100)
1556                                 vc->vc_def_color >>= 1;
1557                         default_attr(vc);
1558                         update_attr(vc);
1559                         break;
1560                 case 9: /* set blanking interval */
1561                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1562                         poke_blanked_console();
1563                         break;
1564                 case 10: /* set bell frequency in Hz */
1565                         if (vc->vc_npar >= 1)
1566                                 vc->vc_bell_pitch = vc->vc_par[1];
1567                         else
1568                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1569                         break;
1570                 case 11: /* set bell duration in msec */
1571                         if (vc->vc_npar >= 1)
1572                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1573                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1574                         else
1575                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1576                         break;
1577                 case 12: /* bring specified console to the front */
1578                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1579                                 set_console(vc->vc_par[1] - 1);
1580                         break;
1581                 case 13: /* unblank the screen */
1582                         poke_blanked_console();
1583                         break;
1584                 case 14: /* set vesa powerdown interval */
1585                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1586                         break;
1587                 case 15: /* activate the previous console */
1588                         set_console(last_console);
1589                         break;
1590                 case 16: /* set cursor blink duration in msec */
1591                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1592                                         vc->vc_par[1] <= USHRT_MAX)
1593                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1594                         else
1595                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1596                         break;
1597         }
1598 }
1599
1600 /* console_lock is held */
1601 static void csi_at(struct vc_data *vc, unsigned int nr)
1602 {
1603         if (nr > vc->vc_cols - vc->vc_x)
1604                 nr = vc->vc_cols - vc->vc_x;
1605         else if (!nr)
1606                 nr = 1;
1607         insert_char(vc, nr);
1608 }
1609
1610 /* console_lock is held */
1611 static void csi_L(struct vc_data *vc, unsigned int nr)
1612 {
1613         if (nr > vc->vc_rows - vc->vc_y)
1614                 nr = vc->vc_rows - vc->vc_y;
1615         else if (!nr)
1616                 nr = 1;
1617         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1618         vc->vc_need_wrap = 0;
1619 }
1620
1621 /* console_lock is held */
1622 static void csi_P(struct vc_data *vc, unsigned int nr)
1623 {
1624         if (nr > vc->vc_cols - vc->vc_x)
1625                 nr = vc->vc_cols - vc->vc_x;
1626         else if (!nr)
1627                 nr = 1;
1628         delete_char(vc, nr);
1629 }
1630
1631 /* console_lock is held */
1632 static void csi_M(struct vc_data *vc, unsigned int nr)
1633 {
1634         if (nr > vc->vc_rows - vc->vc_y)
1635                 nr = vc->vc_rows - vc->vc_y;
1636         else if (!nr)
1637                 nr=1;
1638         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1639         vc->vc_need_wrap = 0;
1640 }
1641
1642 /* console_lock is held (except via vc_init->reset_terminal */
1643 static void save_cur(struct vc_data *vc)
1644 {
1645         vc->vc_saved_x          = vc->vc_x;
1646         vc->vc_saved_y          = vc->vc_y;
1647         vc->vc_s_intensity      = vc->vc_intensity;
1648         vc->vc_s_italic         = vc->vc_italic;
1649         vc->vc_s_underline      = vc->vc_underline;
1650         vc->vc_s_blink          = vc->vc_blink;
1651         vc->vc_s_reverse        = vc->vc_reverse;
1652         vc->vc_s_charset        = vc->vc_charset;
1653         vc->vc_s_color          = vc->vc_color;
1654         vc->vc_saved_G0         = vc->vc_G0_charset;
1655         vc->vc_saved_G1         = vc->vc_G1_charset;
1656 }
1657
1658 /* console_lock is held */
1659 static void restore_cur(struct vc_data *vc)
1660 {
1661         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1662         vc->vc_intensity        = vc->vc_s_intensity;
1663         vc->vc_italic           = vc->vc_s_italic;
1664         vc->vc_underline        = vc->vc_s_underline;
1665         vc->vc_blink            = vc->vc_s_blink;
1666         vc->vc_reverse          = vc->vc_s_reverse;
1667         vc->vc_charset          = vc->vc_s_charset;
1668         vc->vc_color            = vc->vc_s_color;
1669         vc->vc_G0_charset       = vc->vc_saved_G0;
1670         vc->vc_G1_charset       = vc->vc_saved_G1;
1671         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1672         update_attr(vc);
1673         vc->vc_need_wrap = 0;
1674 }
1675
1676 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1677         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1678         ESpalette, ESosc };
1679
1680 /* console_lock is held (except via vc_init()) */
1681 static void reset_terminal(struct vc_data *vc, int do_clear)
1682 {
1683         vc->vc_top              = 0;
1684         vc->vc_bottom           = vc->vc_rows;
1685         vc->vc_state            = ESnormal;
1686         vc->vc_ques             = 0;
1687         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1688         vc->vc_G0_charset       = LAT1_MAP;
1689         vc->vc_G1_charset       = GRAF_MAP;
1690         vc->vc_charset          = 0;
1691         vc->vc_need_wrap        = 0;
1692         vc->vc_report_mouse     = 0;
1693         vc->vc_utf              = default_utf8;
1694         vc->vc_utf_count        = 0;
1695
1696         vc->vc_disp_ctrl        = 0;
1697         vc->vc_toggle_meta      = 0;
1698
1699         vc->vc_decscnm          = 0;
1700         vc->vc_decom            = 0;
1701         vc->vc_decawm           = 1;
1702         vc->vc_deccm            = global_cursor_default;
1703         vc->vc_decim            = 0;
1704
1705         vt_reset_keyboard(vc->vc_num);
1706
1707         vc->vc_cursor_type = cur_default;
1708         vc->vc_complement_mask = vc->vc_s_complement_mask;
1709
1710         default_attr(vc);
1711         update_attr(vc);
1712
1713         vc->vc_tab_stop[0]      = 0x01010100;
1714         vc->vc_tab_stop[1]      =
1715         vc->vc_tab_stop[2]      =
1716         vc->vc_tab_stop[3]      =
1717         vc->vc_tab_stop[4]      =
1718         vc->vc_tab_stop[5]      =
1719         vc->vc_tab_stop[6]      =
1720         vc->vc_tab_stop[7]      = 0x01010101;
1721
1722         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1723         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1724         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1725
1726         gotoxy(vc, 0, 0);
1727         save_cur(vc);
1728         if (do_clear)
1729             csi_J(vc, 2);
1730 }
1731
1732 /* console_lock is held */
1733 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1734 {
1735         /*
1736          *  Control characters can be used in the _middle_
1737          *  of an escape sequence.
1738          */
1739         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1740                 return;
1741         switch (c) {
1742         case 0:
1743                 return;
1744         case 7:
1745                 if (vc->vc_state == ESosc)
1746                         vc->vc_state = ESnormal;
1747                 else if (vc->vc_bell_duration)
1748                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1749                 return;
1750         case 8:
1751                 bs(vc);
1752                 return;
1753         case 9:
1754                 vc->vc_pos -= (vc->vc_x << 1);
1755                 while (vc->vc_x < vc->vc_cols - 1) {
1756                         vc->vc_x++;
1757                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1758                                 break;
1759                 }
1760                 vc->vc_pos += (vc->vc_x << 1);
1761                 notify_write(vc, '\t');
1762                 return;
1763         case 10: case 11: case 12:
1764                 lf(vc);
1765                 if (!is_kbd(vc, lnm))
1766                         return;
1767         case 13:
1768                 cr(vc);
1769                 return;
1770         case 14:
1771                 vc->vc_charset = 1;
1772                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1773                 vc->vc_disp_ctrl = 1;
1774                 return;
1775         case 15:
1776                 vc->vc_charset = 0;
1777                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1778                 vc->vc_disp_ctrl = 0;
1779                 return;
1780         case 24: case 26:
1781                 vc->vc_state = ESnormal;
1782                 return;
1783         case 27:
1784                 vc->vc_state = ESesc;
1785                 return;
1786         case 127:
1787                 del(vc);
1788                 return;
1789         case 128+27:
1790                 vc->vc_state = ESsquare;
1791                 return;
1792         }
1793         switch(vc->vc_state) {
1794         case ESesc:
1795                 vc->vc_state = ESnormal;
1796                 switch (c) {
1797                 case '[':
1798                         vc->vc_state = ESsquare;
1799                         return;
1800                 case ']':
1801                         vc->vc_state = ESnonstd;
1802                         return;
1803                 case '%':
1804                         vc->vc_state = ESpercent;
1805                         return;
1806                 case 'E':
1807                         cr(vc);
1808                         lf(vc);
1809                         return;
1810                 case 'M':
1811                         ri(vc);
1812                         return;
1813                 case 'D':
1814                         lf(vc);
1815                         return;
1816                 case 'H':
1817                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1818                         return;
1819                 case 'Z':
1820                         respond_ID(tty);
1821                         return;
1822                 case '7':
1823                         save_cur(vc);
1824                         return;
1825                 case '8':
1826                         restore_cur(vc);
1827                         return;
1828                 case '(':
1829                         vc->vc_state = ESsetG0;
1830                         return;
1831                 case ')':
1832                         vc->vc_state = ESsetG1;
1833                         return;
1834                 case '#':
1835                         vc->vc_state = EShash;
1836                         return;
1837                 case 'c':
1838                         reset_terminal(vc, 1);
1839                         return;
1840                 case '>':  /* Numeric keypad */
1841                         clr_kbd(vc, kbdapplic);
1842                         return;
1843                 case '=':  /* Appl. keypad */
1844                         set_kbd(vc, kbdapplic);
1845                         return;
1846                 }
1847                 return;
1848         case ESnonstd:
1849                 if (c=='P') {   /* palette escape sequence */
1850                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1851                                 vc->vc_par[vc->vc_npar] = 0;
1852                         vc->vc_npar = 0;
1853                         vc->vc_state = ESpalette;
1854                         return;
1855                 } else if (c=='R') {   /* reset palette */
1856                         reset_palette(vc);
1857                         vc->vc_state = ESnormal;
1858                 } else if (c>='0' && c<='9')
1859                         vc->vc_state = ESosc;
1860                 else
1861                         vc->vc_state = ESnormal;
1862                 return;
1863         case ESpalette:
1864                 if (isxdigit(c)) {
1865                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1866                         if (vc->vc_npar == 7) {
1867                                 int i = vc->vc_par[0] * 3, j = 1;
1868                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1869                                 vc->vc_palette[i++] += vc->vc_par[j++];
1870                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1871                                 vc->vc_palette[i++] += vc->vc_par[j++];
1872                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1873                                 vc->vc_palette[i] += vc->vc_par[j];
1874                                 set_palette(vc);
1875                                 vc->vc_state = ESnormal;
1876                         }
1877                 } else
1878                         vc->vc_state = ESnormal;
1879                 return;
1880         case ESsquare:
1881                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1882                         vc->vc_par[vc->vc_npar] = 0;
1883                 vc->vc_npar = 0;
1884                 vc->vc_state = ESgetpars;
1885                 if (c == '[') { /* Function key */
1886                         vc->vc_state=ESfunckey;
1887                         return;
1888                 }
1889                 vc->vc_ques = (c == '?');
1890                 if (vc->vc_ques)
1891                         return;
1892         case ESgetpars:
1893                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1894                         vc->vc_npar++;
1895                         return;
1896                 } else if (c>='0' && c<='9') {
1897                         vc->vc_par[vc->vc_npar] *= 10;
1898                         vc->vc_par[vc->vc_npar] += c - '0';
1899                         return;
1900                 }
1901                 vc->vc_state = ESnormal;
1902                 switch(c) {
1903                 case 'h':
1904                         set_mode(vc, 1);
1905                         return;
1906                 case 'l':
1907                         set_mode(vc, 0);
1908                         return;
1909                 case 'c':
1910                         if (vc->vc_ques) {
1911                                 if (vc->vc_par[0])
1912                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1913                                 else
1914                                         vc->vc_cursor_type = cur_default;
1915                                 return;
1916                         }
1917                         break;
1918                 case 'm':
1919                         if (vc->vc_ques) {
1920                                 clear_selection();
1921                                 if (vc->vc_par[0])
1922                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1923                                 else
1924                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1925                                 return;
1926                         }
1927                         break;
1928                 case 'n':
1929                         if (!vc->vc_ques) {
1930                                 if (vc->vc_par[0] == 5)
1931                                         status_report(tty);
1932                                 else if (vc->vc_par[0] == 6)
1933                                         cursor_report(vc, tty);
1934                         }
1935                         return;
1936                 }
1937                 if (vc->vc_ques) {
1938                         vc->vc_ques = 0;
1939                         return;
1940                 }
1941                 switch(c) {
1942                 case 'G': case '`':
1943                         if (vc->vc_par[0])
1944                                 vc->vc_par[0]--;
1945                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1946                         return;
1947                 case 'A':
1948                         if (!vc->vc_par[0])
1949                                 vc->vc_par[0]++;
1950                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1951                         return;
1952                 case 'B': case 'e':
1953                         if (!vc->vc_par[0])
1954                                 vc->vc_par[0]++;
1955                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1956                         return;
1957                 case 'C': case 'a':
1958                         if (!vc->vc_par[0])
1959                                 vc->vc_par[0]++;
1960                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1961                         return;
1962                 case 'D':
1963                         if (!vc->vc_par[0])
1964                                 vc->vc_par[0]++;
1965                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1966                         return;
1967                 case 'E':
1968                         if (!vc->vc_par[0])
1969                                 vc->vc_par[0]++;
1970                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1971                         return;
1972                 case 'F':
1973                         if (!vc->vc_par[0])
1974                                 vc->vc_par[0]++;
1975                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1976                         return;
1977                 case 'd':
1978                         if (vc->vc_par[0])
1979                                 vc->vc_par[0]--;
1980                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1981                         return;
1982                 case 'H': case 'f':
1983                         if (vc->vc_par[0])
1984                                 vc->vc_par[0]--;
1985                         if (vc->vc_par[1])
1986                                 vc->vc_par[1]--;
1987                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1988                         return;
1989                 case 'J':
1990                         csi_J(vc, vc->vc_par[0]);
1991                         return;
1992                 case 'K':
1993                         csi_K(vc, vc->vc_par[0]);
1994                         return;
1995                 case 'L':
1996                         csi_L(vc, vc->vc_par[0]);
1997                         return;
1998                 case 'M':
1999                         csi_M(vc, vc->vc_par[0]);
2000                         return;
2001                 case 'P':
2002                         csi_P(vc, vc->vc_par[0]);
2003                         return;
2004                 case 'c':
2005                         if (!vc->vc_par[0])
2006                                 respond_ID(tty);
2007                         return;
2008                 case 'g':
2009                         if (!vc->vc_par[0])
2010                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2011                         else if (vc->vc_par[0] == 3) {
2012                                 vc->vc_tab_stop[0] =
2013                                         vc->vc_tab_stop[1] =
2014                                         vc->vc_tab_stop[2] =
2015                                         vc->vc_tab_stop[3] =
2016                                         vc->vc_tab_stop[4] =
2017                                         vc->vc_tab_stop[5] =
2018                                         vc->vc_tab_stop[6] =
2019                                         vc->vc_tab_stop[7] = 0;
2020                         }
2021                         return;
2022                 case 'm':
2023                         csi_m(vc);
2024                         return;
2025                 case 'q': /* DECLL - but only 3 leds */
2026                         /* map 0,1,2,3 to 0,1,2,4 */
2027                         if (vc->vc_par[0] < 4)
2028                                 vt_set_led_state(vc->vc_num,
2029                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2030                         return;
2031                 case 'r':
2032                         if (!vc->vc_par[0])
2033                                 vc->vc_par[0]++;
2034                         if (!vc->vc_par[1])
2035                                 vc->vc_par[1] = vc->vc_rows;
2036                         /* Minimum allowed region is 2 lines */
2037                         if (vc->vc_par[0] < vc->vc_par[1] &&
2038                             vc->vc_par[1] <= vc->vc_rows) {
2039                                 vc->vc_top = vc->vc_par[0] - 1;
2040                                 vc->vc_bottom = vc->vc_par[1];
2041                                 gotoxay(vc, 0, 0);
2042                         }
2043                         return;
2044                 case 's':
2045                         save_cur(vc);
2046                         return;
2047                 case 'u':
2048                         restore_cur(vc);
2049                         return;
2050                 case 'X':
2051                         csi_X(vc, vc->vc_par[0]);
2052                         return;
2053                 case '@':
2054                         csi_at(vc, vc->vc_par[0]);
2055                         return;
2056                 case ']': /* setterm functions */
2057                         setterm_command(vc);
2058                         return;
2059                 }
2060                 return;
2061         case ESpercent:
2062                 vc->vc_state = ESnormal;
2063                 switch (c) {
2064                 case '@':  /* defined in ISO 2022 */
2065                         vc->vc_utf = 0;
2066                         return;
2067                 case 'G':  /* prelim official escape code */
2068                 case '8':  /* retained for compatibility */
2069                         vc->vc_utf = 1;
2070                         return;
2071                 }
2072                 return;
2073         case ESfunckey:
2074                 vc->vc_state = ESnormal;
2075                 return;
2076         case EShash:
2077                 vc->vc_state = ESnormal;
2078                 if (c == '8') {
2079                         /* DEC screen alignment test. kludge :-) */
2080                         vc->vc_video_erase_char =
2081                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2082                         csi_J(vc, 2);
2083                         vc->vc_video_erase_char =
2084                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2085                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2086                 }
2087                 return;
2088         case ESsetG0:
2089                 if (c == '0')
2090                         vc->vc_G0_charset = GRAF_MAP;
2091                 else if (c == 'B')
2092                         vc->vc_G0_charset = LAT1_MAP;
2093                 else if (c == 'U')
2094                         vc->vc_G0_charset = IBMPC_MAP;
2095                 else if (c == 'K')
2096                         vc->vc_G0_charset = USER_MAP;
2097                 if (vc->vc_charset == 0)
2098                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2099                 vc->vc_state = ESnormal;
2100                 return;
2101         case ESsetG1:
2102                 if (c == '0')
2103                         vc->vc_G1_charset = GRAF_MAP;
2104                 else if (c == 'B')
2105                         vc->vc_G1_charset = LAT1_MAP;
2106                 else if (c == 'U')
2107                         vc->vc_G1_charset = IBMPC_MAP;
2108                 else if (c == 'K')
2109                         vc->vc_G1_charset = USER_MAP;
2110                 if (vc->vc_charset == 1)
2111                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2112                 vc->vc_state = ESnormal;
2113                 return;
2114         case ESosc:
2115                 return;
2116         default:
2117                 vc->vc_state = ESnormal;
2118         }
2119 }
2120
2121 /* is_double_width() is based on the wcwidth() implementation by
2122  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2123  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2124  */
2125 struct interval {
2126         uint32_t first;
2127         uint32_t last;
2128 };
2129
2130 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2131 {
2132         int min = 0;
2133         int mid;
2134
2135         if (ucs < table[0].first || ucs > table[max].last)
2136                 return 0;
2137         while (max >= min) {
2138                 mid = (min + max) / 2;
2139                 if (ucs > table[mid].last)
2140                         min = mid + 1;
2141                 else if (ucs < table[mid].first)
2142                         max = mid - 1;
2143                 else
2144                         return 1;
2145         }
2146         return 0;
2147 }
2148
2149 static int is_double_width(uint32_t ucs)
2150 {
2151         static const struct interval double_width[] = {
2152                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2153                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2154                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2155                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2156         };
2157         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2158 }
2159
2160 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2161                 unsigned long draw_to, int *draw_x)
2162 {
2163         if (*draw_x < 0)
2164                 return;
2165
2166         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2167                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2168         *draw_x = -1;
2169 }
2170
2171 /* acquires console_lock */
2172 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2173 {
2174         int c, tc, ok, n = 0, draw_x = -1;
2175         unsigned int currcons;
2176         unsigned long draw_from = 0, draw_to = 0;
2177         struct vc_data *vc;
2178         unsigned char vc_attr;
2179         struct vt_notifier_param param;
2180         uint8_t rescan;
2181         uint8_t inverse;
2182         uint8_t width;
2183         u16 himask, charmask;
2184
2185         if (in_interrupt())
2186                 return count;
2187
2188         might_sleep();
2189
2190         console_lock();
2191         vc = tty->driver_data;
2192         if (vc == NULL) {
2193                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2194                 console_unlock();
2195                 return 0;
2196         }
2197
2198         currcons = vc->vc_num;
2199         if (!vc_cons_allocated(currcons)) {
2200                 /* could this happen? */
2201                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2202                 console_unlock();
2203                 return 0;
2204         }
2205
2206         himask = vc->vc_hi_font_mask;
2207         charmask = himask ? 0x1ff : 0xff;
2208
2209         /* undraw cursor first */
2210         if (IS_FG(vc))
2211                 hide_cursor(vc);
2212
2213         param.vc = vc;
2214
2215         while (!tty->stopped && count) {
2216                 int orig = *buf;
2217                 c = orig;
2218                 buf++;
2219                 n++;
2220                 count--;
2221                 rescan = 0;
2222                 inverse = 0;
2223                 width = 1;
2224
2225                 /* Do no translation at all in control states */
2226                 if (vc->vc_state != ESnormal) {
2227                         tc = c;
2228                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2229                     /* Combine UTF-8 into Unicode in vc_utf_char.
2230                      * vc_utf_count is the number of continuation bytes still
2231                      * expected to arrive.
2232                      * vc_npar is the number of continuation bytes arrived so
2233                      * far
2234                      */
2235 rescan_last_byte:
2236                     if ((c & 0xc0) == 0x80) {
2237                         /* Continuation byte received */
2238                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2239                         if (vc->vc_utf_count) {
2240                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2241                             vc->vc_npar++;
2242                             if (--vc->vc_utf_count) {
2243                                 /* Still need some bytes */
2244                                 continue;
2245                             }
2246                             /* Got a whole character */
2247                             c = vc->vc_utf_char;
2248                             /* Reject overlong sequences */
2249                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2250                                         c > utf8_length_changes[vc->vc_npar])
2251                                 c = 0xfffd;
2252                         } else {
2253                             /* Unexpected continuation byte */
2254                             vc->vc_utf_count = 0;
2255                             c = 0xfffd;
2256                         }
2257                     } else {
2258                         /* Single ASCII byte or first byte of a sequence received */
2259                         if (vc->vc_utf_count) {
2260                             /* Continuation byte expected */
2261                             rescan = 1;
2262                             vc->vc_utf_count = 0;
2263                             c = 0xfffd;
2264                         } else if (c > 0x7f) {
2265                             /* First byte of a multibyte sequence received */
2266                             vc->vc_npar = 0;
2267                             if ((c & 0xe0) == 0xc0) {
2268                                 vc->vc_utf_count = 1;
2269                                 vc->vc_utf_char = (c & 0x1f);
2270                             } else if ((c & 0xf0) == 0xe0) {
2271                                 vc->vc_utf_count = 2;
2272                                 vc->vc_utf_char = (c & 0x0f);
2273                             } else if ((c & 0xf8) == 0xf0) {
2274                                 vc->vc_utf_count = 3;
2275                                 vc->vc_utf_char = (c & 0x07);
2276                             } else if ((c & 0xfc) == 0xf8) {
2277                                 vc->vc_utf_count = 4;
2278                                 vc->vc_utf_char = (c & 0x03);
2279                             } else if ((c & 0xfe) == 0xfc) {
2280                                 vc->vc_utf_count = 5;
2281                                 vc->vc_utf_char = (c & 0x01);
2282                             } else {
2283                                 /* 254 and 255 are invalid */
2284                                 c = 0xfffd;
2285                             }
2286                             if (vc->vc_utf_count) {
2287                                 /* Still need some bytes */
2288                                 continue;
2289                             }
2290                         }
2291                         /* Nothing to do if an ASCII byte was received */
2292                     }
2293                     /* End of UTF-8 decoding. */
2294                     /* c is the received character, or U+FFFD for invalid sequences. */
2295                     /* Replace invalid Unicode code points with U+FFFD too */
2296                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2297                         c = 0xfffd;
2298                     tc = c;
2299                 } else {        /* no utf or alternate charset mode */
2300                     tc = vc_translate(vc, c);
2301                 }
2302
2303                 param.c = tc;
2304                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2305                                         &param) == NOTIFY_STOP)
2306                         continue;
2307
2308                 /* If the original code was a control character we
2309                  * only allow a glyph to be displayed if the code is
2310                  * not normally used (such as for cursor movement) or
2311                  * if the disp_ctrl mode has been explicitly enabled.
2312                  * Certain characters (as given by the CTRL_ALWAYS
2313                  * bitmap) are always displayed as control characters,
2314                  * as the console would be pretty useless without
2315                  * them; to display an arbitrary font position use the
2316                  * direct-to-font zone in UTF-8 mode.
2317                  */
2318                 ok = tc && (c >= 32 ||
2319                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2320                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2321                         && (c != 127 || vc->vc_disp_ctrl)
2322                         && (c != 128+27);
2323
2324                 if (vc->vc_state == ESnormal && ok) {
2325                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2326                                 if (is_double_width(c))
2327                                         width = 2;
2328                         }
2329                         /* Now try to find out how to display it */
2330                         tc = conv_uni_to_pc(vc, tc);
2331                         if (tc & ~charmask) {
2332                                 if (tc == -1 || tc == -2) {
2333                                     continue; /* nothing to display */
2334                                 }
2335                                 /* Glyph not found */
2336                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2337                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2338                                        This would make absolutely no sense with Unicode in mind,
2339                                        but do this for ASCII characters since a font may lack
2340                                        Unicode mapping info and we don't want to end up with
2341                                        having question marks only. */
2342                                     tc = c;
2343                                 } else {
2344                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2345                                     tc = conv_uni_to_pc(vc, 0xfffd);
2346                                     if (tc < 0) {
2347                                         inverse = 1;
2348                                         tc = conv_uni_to_pc(vc, '?');
2349                                         if (tc < 0) tc = '?';
2350                                     }
2351                                 }
2352                         }
2353
2354                         if (!inverse) {
2355                                 vc_attr = vc->vc_attr;
2356                         } else {
2357                                 /* invert vc_attr */
2358                                 if (!vc->vc_can_do_color) {
2359                                         vc_attr = (vc->vc_attr) ^ 0x08;
2360                                 } else if (vc->vc_hi_font_mask == 0x100) {
2361                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2362                                 } else {
2363                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2364                                 }
2365                                 con_flush(vc, draw_from, draw_to, &draw_x);
2366                         }
2367
2368                         while (1) {
2369                                 if (vc->vc_need_wrap || vc->vc_decim)
2370                                         con_flush(vc, draw_from, draw_to,
2371                                                         &draw_x);
2372                                 if (vc->vc_need_wrap) {
2373                                         cr(vc);
2374                                         lf(vc);
2375                                 }
2376                                 if (vc->vc_decim)
2377                                         insert_char(vc, 1);
2378                                 scr_writew(himask ?
2379                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2380                                              (vc_attr << 8) + tc,
2381                                            (u16 *) vc->vc_pos);
2382                                 if (DO_UPDATE(vc) && draw_x < 0) {
2383                                         draw_x = vc->vc_x;
2384                                         draw_from = vc->vc_pos;
2385                                 }
2386                                 if (vc->vc_x == vc->vc_cols - 1) {
2387                                         vc->vc_need_wrap = vc->vc_decawm;
2388                                         draw_to = vc->vc_pos + 2;
2389                                 } else {
2390                                         vc->vc_x++;
2391                                         draw_to = (vc->vc_pos += 2);
2392                                 }
2393
2394                                 if (!--width) break;
2395
2396                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2397                                 if (tc < 0) tc = ' ';
2398                         }
2399                         notify_write(vc, c);
2400
2401                         if (inverse)
2402                                 con_flush(vc, draw_from, draw_to, &draw_x);
2403
2404                         if (rescan) {
2405                                 rescan = 0;
2406                                 inverse = 0;
2407                                 width = 1;
2408                                 c = orig;
2409                                 goto rescan_last_byte;
2410                         }
2411                         continue;
2412                 }
2413                 con_flush(vc, draw_from, draw_to, &draw_x);
2414                 do_con_trol(tty, vc, orig);
2415         }
2416         con_flush(vc, draw_from, draw_to, &draw_x);
2417         console_conditional_schedule();
2418         console_unlock();
2419         notify_update(vc);
2420         return n;
2421 }
2422
2423 /*
2424  * This is the console switching callback.
2425  *
2426  * Doing console switching in a process context allows
2427  * us to do the switches asynchronously (needed when we want
2428  * to switch due to a keyboard interrupt).  Synchronization
2429  * with other console code and prevention of re-entrancy is
2430  * ensured with console_lock.
2431  */
2432 static void console_callback(struct work_struct *ignored)
2433 {
2434         console_lock();
2435
2436         if (want_console >= 0) {
2437                 if (want_console != fg_console &&
2438                     vc_cons_allocated(want_console)) {
2439                         hide_cursor(vc_cons[fg_console].d);
2440                         change_console(vc_cons[want_console].d);
2441                         /* we only changed when the console had already
2442                            been allocated - a new console is not created
2443                            in an interrupt routine */
2444                 }
2445                 want_console = -1;
2446         }
2447         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2448                 do_poke_blanked_console = 0;
2449                 poke_blanked_console();
2450         }
2451         if (scrollback_delta) {
2452                 struct vc_data *vc = vc_cons[fg_console].d;
2453                 clear_selection();
2454                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2455                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2456                 scrollback_delta = 0;
2457         }
2458         if (blank_timer_expired) {
2459                 do_blank_screen(0);
2460                 blank_timer_expired = 0;
2461         }
2462         notify_update(vc_cons[fg_console].d);
2463
2464         console_unlock();
2465 }
2466
2467 int set_console(int nr)
2468 {
2469         struct vc_data *vc = vc_cons[fg_console].d;
2470
2471         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2472                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2473
2474                 /*
2475                  * Console switch will fail in console_callback() or
2476                  * change_console() so there is no point scheduling
2477                  * the callback
2478                  *
2479                  * Existing set_console() users don't check the return
2480                  * value so this shouldn't break anything
2481                  */
2482                 return -EINVAL;
2483         }
2484
2485         want_console = nr;
2486         schedule_console_callback();
2487
2488         return 0;
2489 }
2490
2491 struct tty_driver *console_driver;
2492
2493 #ifdef CONFIG_VT_CONSOLE
2494
2495 /**
2496  * vt_kmsg_redirect() - Sets/gets the kernel message console
2497  * @new:        The new virtual terminal number or -1 if the console should stay
2498  *              unchanged
2499  *
2500  * By default, the kernel messages are always printed on the current virtual
2501  * console. However, the user may modify that default with the
2502  * TIOCL_SETKMSGREDIRECT ioctl call.
2503  *
2504  * This function sets the kernel message console to be @new. It returns the old
2505  * virtual console number. The virtual terminal number 0 (both as parameter and
2506  * return value) means no redirection (i.e. always printed on the currently
2507  * active console).
2508  *
2509  * The parameter -1 means that only the current console is returned, but the
2510  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2511  * case to make the code more understandable.
2512  *
2513  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2514  * the parameter and always returns 0.
2515  */
2516 int vt_kmsg_redirect(int new)
2517 {
2518         static int kmsg_con;
2519
2520         if (new != -1)
2521                 return xchg(&kmsg_con, new);
2522         else
2523                 return kmsg_con;
2524 }
2525
2526 /*
2527  *      Console on virtual terminal
2528  *
2529  * The console must be locked when we get here.
2530  */
2531
2532 static void vt_console_print(struct console *co, const char *b, unsigned count)
2533 {
2534         struct vc_data *vc = vc_cons[fg_console].d;
2535         unsigned char c;
2536         static DEFINE_SPINLOCK(printing_lock);
2537         const ushort *start;
2538         ushort cnt = 0;
2539         ushort myx;
2540         int kmsg_console;
2541
2542         /* console busy or not yet initialized */
2543         if (!printable)
2544                 return;
2545         if (!spin_trylock(&printing_lock))
2546                 return;
2547
2548         kmsg_console = vt_get_kmsg_redirect();
2549         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2550                 vc = vc_cons[kmsg_console - 1].d;
2551
2552         /* read `x' only after setting currcons properly (otherwise
2553            the `x' macro will read the x of the foreground console). */
2554         myx = vc->vc_x;
2555
2556         if (!vc_cons_allocated(fg_console)) {
2557                 /* impossible */
2558                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2559                 goto quit;
2560         }
2561
2562         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2563                 goto quit;
2564
2565         /* undraw cursor first */
2566         if (IS_FG(vc))
2567                 hide_cursor(vc);
2568
2569         start = (ushort *)vc->vc_pos;
2570
2571         /* Contrived structure to try to emulate original need_wrap behaviour
2572          * Problems caused when we have need_wrap set on '\n' character */
2573         while (count--) {
2574                 c = *b++;
2575                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2576                         if (cnt > 0) {
2577                                 if (CON_IS_VISIBLE(vc))
2578                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2579                                 vc->vc_x += cnt;
2580                                 if (vc->vc_need_wrap)
2581                                         vc->vc_x--;
2582                                 cnt = 0;
2583                         }
2584                         if (c == 8) {           /* backspace */
2585                                 bs(vc);
2586                                 start = (ushort *)vc->vc_pos;
2587                                 myx = vc->vc_x;
2588                                 continue;
2589                         }
2590                         if (c != 13)
2591                                 lf(vc);
2592                         cr(vc);
2593                         start = (ushort *)vc->vc_pos;
2594                         myx = vc->vc_x;
2595                         if (c == 10 || c == 13)
2596                                 continue;
2597                 }
2598                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2599                 notify_write(vc, c);
2600                 cnt++;
2601                 if (myx == vc->vc_cols - 1) {
2602                         vc->vc_need_wrap = 1;
2603                         continue;
2604                 }
2605                 vc->vc_pos += 2;
2606                 myx++;
2607         }
2608         if (cnt > 0) {
2609                 if (CON_IS_VISIBLE(vc))
2610                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2611                 vc->vc_x += cnt;
2612                 if (vc->vc_x == vc->vc_cols) {
2613                         vc->vc_x--;
2614                         vc->vc_need_wrap = 1;
2615                 }
2616         }
2617         set_cursor(vc);
2618         notify_update(vc);
2619
2620 quit:
2621         spin_unlock(&printing_lock);
2622 }
2623
2624 static struct tty_driver *vt_console_device(struct console *c, int *index)
2625 {
2626         *index = c->index ? c->index-1 : fg_console;
2627         return console_driver;
2628 }
2629
2630 static struct console vt_console_driver = {
2631         .name           = "tty",
2632         .write          = vt_console_print,
2633         .device         = vt_console_device,
2634         .unblank        = unblank_screen,
2635         .flags          = CON_PRINTBUFFER,
2636         .index          = -1,
2637 };
2638 #endif
2639
2640 /*
2641  *      Handling of Linux-specific VC ioctls
2642  */
2643
2644 /*
2645  * Generally a bit racy with respect to console_lock();.
2646  *
2647  * There are some functions which don't need it.
2648  *
2649  * There are some functions which can sleep for arbitrary periods
2650  * (paste_selection) but we don't need the lock there anyway.
2651  *
2652  * set_selection has locking, and definitely needs it
2653  */
2654
2655 int tioclinux(struct tty_struct *tty, unsigned long arg)
2656 {
2657         char type, data;
2658         char __user *p = (char __user *)arg;
2659         int lines;
2660         int ret;
2661
2662         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2663                 return -EPERM;
2664         if (get_user(type, p))
2665                 return -EFAULT;
2666         ret = 0;
2667
2668         switch (type)
2669         {
2670                 case TIOCL_SETSEL:
2671                         console_lock();
2672                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2673                         console_unlock();
2674                         break;
2675                 case TIOCL_PASTESEL:
2676                         ret = paste_selection(tty);
2677                         break;
2678                 case TIOCL_UNBLANKSCREEN:
2679                         console_lock();
2680                         unblank_screen();
2681                         console_unlock();
2682                         break;
2683                 case TIOCL_SELLOADLUT:
2684                         console_lock();
2685                         ret = sel_loadlut(p);
2686                         console_unlock();
2687                         break;
2688                 case TIOCL_GETSHIFTSTATE:
2689
2690         /*
2691          * Make it possible to react to Shift+Mousebutton.
2692          * Note that 'shift_state' is an undocumented
2693          * kernel-internal variable; programs not closely
2694          * related to the kernel should not use this.
2695          */
2696                         data = vt_get_shift_state();
2697                         ret = __put_user(data, p);
2698                         break;
2699                 case TIOCL_GETMOUSEREPORTING:
2700                         console_lock(); /* May be overkill */
2701                         data = mouse_reporting();
2702                         console_unlock();
2703                         ret = __put_user(data, p);
2704                         break;
2705                 case TIOCL_SETVESABLANK:
2706                         console_lock();
2707                         ret = set_vesa_blanking(p);
2708                         console_unlock();
2709                         break;
2710                 case TIOCL_GETKMSGREDIRECT:
2711                         data = vt_get_kmsg_redirect();
2712                         ret = __put_user(data, p);
2713                         break;
2714                 case TIOCL_SETKMSGREDIRECT:
2715                         if (!capable(CAP_SYS_ADMIN)) {
2716                                 ret = -EPERM;
2717                         } else {
2718                                 if (get_user(data, p+1))
2719                                         ret = -EFAULT;
2720                                 else
2721                                         vt_kmsg_redirect(data);
2722                         }
2723                         break;
2724                 case TIOCL_GETFGCONSOLE:
2725                         /* No locking needed as this is a transiently
2726                            correct return anyway if the caller hasn't
2727                            disabled switching */
2728                         ret = fg_console;
2729                         break;
2730                 case TIOCL_SCROLLCONSOLE:
2731                         if (get_user(lines, (s32 __user *)(p+4))) {
2732                                 ret = -EFAULT;
2733                         } else {
2734                                 /* Need the console lock here. Note that lots
2735                                    of other calls need fixing before the lock
2736                                    is actually useful ! */
2737                                 console_lock();
2738                                 scrollfront(vc_cons[fg_console].d, lines);
2739                                 console_unlock();
2740                                 ret = 0;
2741                         }
2742                         break;
2743                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2744                         console_lock();
2745                         ignore_poke = 1;
2746                         do_blank_screen(0);
2747                         console_unlock();
2748                         break;
2749                 case TIOCL_BLANKEDSCREEN:
2750                         ret = console_blanked;
2751                         break;
2752                 default:
2753                         ret = -EINVAL;
2754                         break;
2755         }
2756         return ret;
2757 }
2758
2759 /*
2760  * /dev/ttyN handling
2761  */
2762
2763 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2764 {
2765         int     retval;
2766
2767         retval = do_con_write(tty, buf, count);
2768         con_flush_chars(tty);
2769
2770         return retval;
2771 }
2772
2773 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2774 {
2775         if (in_interrupt())
2776                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2777         return do_con_write(tty, &ch, 1);
2778 }
2779
2780 static int con_write_room(struct tty_struct *tty)
2781 {
2782         if (tty->stopped)
2783                 return 0;
2784         return 32768;           /* No limit, really; we're not buffering */
2785 }
2786
2787 static int con_chars_in_buffer(struct tty_struct *tty)
2788 {
2789         return 0;               /* we're not buffering */
2790 }
2791
2792 /*
2793  * con_throttle and con_unthrottle are only used for
2794  * paste_selection(), which has to stuff in a large number of
2795  * characters...
2796  */
2797 static void con_throttle(struct tty_struct *tty)
2798 {
2799 }
2800
2801 static void con_unthrottle(struct tty_struct *tty)
2802 {
2803         struct vc_data *vc = tty->driver_data;
2804
2805         wake_up_interruptible(&vc->paste_wait);
2806 }
2807
2808 /*
2809  * Turn the Scroll-Lock LED on when the tty is stopped
2810  */
2811 static void con_stop(struct tty_struct *tty)
2812 {
2813         int console_num;
2814         if (!tty)
2815                 return;
2816         console_num = tty->index;
2817         if (!vc_cons_allocated(console_num))
2818                 return;
2819         vt_kbd_con_stop(console_num);
2820 }
2821
2822 /*
2823  * Turn the Scroll-Lock LED off when the console is started
2824  */
2825 static void con_start(struct tty_struct *tty)
2826 {
2827         int console_num;
2828         if (!tty)
2829                 return;
2830         console_num = tty->index;
2831         if (!vc_cons_allocated(console_num))
2832                 return;
2833         vt_kbd_con_start(console_num);
2834 }
2835
2836 static void con_flush_chars(struct tty_struct *tty)
2837 {
2838         struct vc_data *vc;
2839
2840         if (in_interrupt())     /* from flush_to_ldisc */
2841                 return;
2842
2843         /* if we race with con_close(), vt may be null */
2844         console_lock();
2845         vc = tty->driver_data;
2846         if (vc)
2847                 set_cursor(vc);
2848         console_unlock();
2849 }
2850
2851 /*
2852  * Allocate the console screen memory.
2853  */
2854 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2855 {
2856         unsigned int currcons = tty->index;
2857         struct vc_data *vc;
2858         int ret;
2859
2860         console_lock();
2861         ret = vc_allocate(currcons);
2862         if (ret)
2863                 goto unlock;
2864
2865         vc = vc_cons[currcons].d;
2866
2867         /* Still being freed */
2868         if (vc->port.tty) {
2869                 ret = -ERESTARTSYS;
2870                 goto unlock;
2871         }
2872
2873         ret = tty_port_install(&vc->port, driver, tty);
2874         if (ret)
2875                 goto unlock;
2876
2877         tty->driver_data = vc;
2878         vc->port.tty = tty;
2879
2880         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2881                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2882                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2883         }
2884         if (vc->vc_utf)
2885                 tty->termios.c_iflag |= IUTF8;
2886         else
2887                 tty->termios.c_iflag &= ~IUTF8;
2888 unlock:
2889         console_unlock();
2890         return ret;
2891 }
2892
2893 static int con_open(struct tty_struct *tty, struct file *filp)
2894 {
2895         /* everything done in install */
2896         return 0;
2897 }
2898
2899
2900 static void con_close(struct tty_struct *tty, struct file *filp)
2901 {
2902         /* Nothing to do - we defer to shutdown */
2903 }
2904
2905 static void con_shutdown(struct tty_struct *tty)
2906 {
2907         struct vc_data *vc = tty->driver_data;
2908         BUG_ON(vc == NULL);
2909         console_lock();
2910         vc->port.tty = NULL;
2911         console_unlock();
2912 }
2913
2914 static int default_color           = 7; /* white */
2915 static int default_italic_color    = 2; // green (ASCII)
2916 static int default_underline_color = 3; // cyan (ASCII)
2917 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2918 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2919 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2920
2921 static void vc_init(struct vc_data *vc, unsigned int rows,
2922                     unsigned int cols, int do_clear)
2923 {
2924         int j, k ;
2925
2926         vc->vc_cols = cols;
2927         vc->vc_rows = rows;
2928         vc->vc_size_row = cols << 1;
2929         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2930
2931         set_origin(vc);
2932         vc->vc_pos = vc->vc_origin;
2933         reset_vc(vc);
2934         for (j=k=0; j<16; j++) {
2935                 vc->vc_palette[k++] = default_red[j] ;
2936                 vc->vc_palette[k++] = default_grn[j] ;
2937                 vc->vc_palette[k++] = default_blu[j] ;
2938         }
2939         vc->vc_def_color       = default_color;
2940         vc->vc_ulcolor         = default_underline_color;
2941         vc->vc_itcolor         = default_italic_color;
2942         vc->vc_halfcolor       = 0x08;   /* grey */
2943         init_waitqueue_head(&vc->paste_wait);
2944         reset_terminal(vc, do_clear);
2945 }
2946
2947 /*
2948  * This routine initializes console interrupts, and does nothing
2949  * else. If you want the screen to clear, call tty_write with
2950  * the appropriate escape-sequence.
2951  */
2952
2953 static int __init con_init(void)
2954 {
2955         const char *display_desc = NULL;
2956         struct vc_data *vc;
2957         unsigned int currcons = 0, i;
2958
2959         console_lock();
2960
2961         if (conswitchp)
2962                 display_desc = conswitchp->con_startup();
2963         if (!display_desc) {
2964                 fg_console = 0;
2965                 console_unlock();
2966                 return 0;
2967         }
2968
2969         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2970                 struct con_driver *con_driver = &registered_con_driver[i];
2971
2972                 if (con_driver->con == NULL) {
2973                         con_driver->con = conswitchp;
2974                         con_driver->desc = display_desc;
2975                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2976                         con_driver->first = 0;
2977                         con_driver->last = MAX_NR_CONSOLES - 1;
2978                         break;
2979                 }
2980         }
2981
2982         for (i = 0; i < MAX_NR_CONSOLES; i++)
2983                 con_driver_map[i] = conswitchp;
2984
2985         if (blankinterval) {
2986                 blank_state = blank_normal_wait;
2987                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2988         }
2989
2990         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2991                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2992                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2993                 tty_port_init(&vc->port);
2994                 visual_init(vc, currcons, 1);
2995                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2996                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2997                         currcons || !vc->vc_sw->con_save_screen);
2998         }
2999         currcons = fg_console = 0;
3000         master_display_fg = vc = vc_cons[currcons].d;
3001         set_origin(vc);
3002         save_screen(vc);
3003         gotoxy(vc, vc->vc_x, vc->vc_y);
3004         csi_J(vc, 0);
3005         update_screen(vc);
3006         pr_info("Console: %s %s %dx%d\n",
3007                 vc->vc_can_do_color ? "colour" : "mono",
3008                 display_desc, vc->vc_cols, vc->vc_rows);
3009         printable = 1;
3010
3011         console_unlock();
3012
3013 #ifdef CONFIG_VT_CONSOLE
3014         register_console(&vt_console_driver);
3015 #endif
3016         return 0;
3017 }
3018 console_initcall(con_init);
3019
3020 static const struct tty_operations con_ops = {
3021         .install = con_install,
3022         .open = con_open,
3023         .close = con_close,
3024         .write = con_write,
3025         .write_room = con_write_room,
3026         .put_char = con_put_char,
3027         .flush_chars = con_flush_chars,
3028         .chars_in_buffer = con_chars_in_buffer,
3029         .ioctl = vt_ioctl,
3030 #ifdef CONFIG_COMPAT
3031         .compat_ioctl = vt_compat_ioctl,
3032 #endif
3033         .stop = con_stop,
3034         .start = con_start,
3035         .throttle = con_throttle,
3036         .unthrottle = con_unthrottle,
3037         .resize = vt_resize,
3038         .shutdown = con_shutdown
3039 };
3040
3041 static struct cdev vc0_cdev;
3042
3043 static ssize_t show_tty_active(struct device *dev,
3044                                 struct device_attribute *attr, char *buf)
3045 {
3046         return sprintf(buf, "tty%d\n", fg_console + 1);
3047 }
3048 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3049
3050 static struct attribute *vt_dev_attrs[] = {
3051         &dev_attr_active.attr,
3052         NULL
3053 };
3054
3055 ATTRIBUTE_GROUPS(vt_dev);
3056
3057 int __init vty_init(const struct file_operations *console_fops)
3058 {
3059         cdev_init(&vc0_cdev, console_fops);
3060         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3061             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3062                 panic("Couldn't register /dev/tty0 driver\n");
3063         tty0dev = device_create_with_groups(tty_class, NULL,
3064                                             MKDEV(TTY_MAJOR, 0), NULL,
3065                                             vt_dev_groups, "tty0");
3066         if (IS_ERR(tty0dev))
3067                 tty0dev = NULL;
3068
3069         vcs_init();
3070
3071         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3072         if (!console_driver)
3073                 panic("Couldn't allocate console driver\n");
3074
3075         console_driver->name = "tty";
3076         console_driver->name_base = 1;
3077         console_driver->major = TTY_MAJOR;
3078         console_driver->minor_start = 1;
3079         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3080         console_driver->init_termios = tty_std_termios;
3081         if (default_utf8)
3082                 console_driver->init_termios.c_iflag |= IUTF8;
3083         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3084         tty_set_operations(console_driver, &con_ops);
3085         if (tty_register_driver(console_driver))
3086                 panic("Couldn't register console driver\n");
3087         kbd_init();
3088         console_map_init();
3089 #ifdef CONFIG_MDA_CONSOLE
3090         mda_console_init();
3091 #endif
3092         return 0;
3093 }
3094
3095 #ifndef VT_SINGLE_DRIVER
3096
3097 static struct class *vtconsole_class;
3098
3099 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3100                            int deflt)
3101 {
3102         struct module *owner = csw->owner;
3103         const char *desc = NULL;
3104         struct con_driver *con_driver;
3105         int i, j = -1, k = -1, retval = -ENODEV;
3106
3107         if (!try_module_get(owner))
3108                 return -ENODEV;
3109
3110         WARN_CONSOLE_UNLOCKED();
3111
3112         /* check if driver is registered */
3113         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3114                 con_driver = &registered_con_driver[i];
3115
3116                 if (con_driver->con == csw) {
3117                         desc = con_driver->desc;
3118                         retval = 0;
3119                         break;
3120                 }
3121         }
3122
3123         if (retval)
3124                 goto err;
3125
3126         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3127                 csw->con_startup();
3128                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3129         }
3130
3131         if (deflt) {
3132                 if (conswitchp)
3133                         module_put(conswitchp->owner);
3134
3135                 __module_get(owner);
3136                 conswitchp = csw;
3137         }
3138
3139         first = max(first, con_driver->first);
3140         last = min(last, con_driver->last);
3141
3142         for (i = first; i <= last; i++) {
3143                 int old_was_color;
3144                 struct vc_data *vc = vc_cons[i].d;
3145
3146                 if (con_driver_map[i])
3147                         module_put(con_driver_map[i]->owner);
3148                 __module_get(owner);
3149                 con_driver_map[i] = csw;
3150
3151                 if (!vc || !vc->vc_sw)
3152                         continue;
3153
3154                 j = i;
3155
3156                 if (CON_IS_VISIBLE(vc)) {
3157                         k = i;
3158                         save_screen(vc);
3159                 }
3160
3161                 old_was_color = vc->vc_can_do_color;
3162                 vc->vc_sw->con_deinit(vc);
3163                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3164                 visual_init(vc, i, 0);
3165                 set_origin(vc);
3166                 update_attr(vc);
3167
3168                 /* If the console changed between mono <-> color, then
3169                  * the attributes in the screenbuf will be wrong.  The
3170                  * following resets all attributes to something sane.
3171                  */
3172                 if (old_was_color != vc->vc_can_do_color)
3173                         clear_buffer_attributes(vc);
3174         }
3175
3176         pr_info("Console: switching ");
3177         if (!deflt)
3178                 printk("consoles %d-%d ", first+1, last+1);
3179         if (j >= 0) {
3180                 struct vc_data *vc = vc_cons[j].d;
3181
3182                 printk("to %s %s %dx%d\n",
3183                        vc->vc_can_do_color ? "colour" : "mono",
3184                        desc, vc->vc_cols, vc->vc_rows);
3185
3186                 if (k >= 0) {
3187                         vc = vc_cons[k].d;
3188                         update_screen(vc);
3189                 }
3190         } else
3191                 printk("to %s\n", desc);
3192
3193         retval = 0;
3194 err:
3195         module_put(owner);
3196         return retval;
3197 };
3198
3199
3200 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3201 /* unlocked version of unbind_con_driver() */
3202 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3203 {
3204         struct module *owner = csw->owner;
3205         const struct consw *defcsw = NULL;
3206         struct con_driver *con_driver = NULL, *con_back = NULL;
3207         int i, retval = -ENODEV;
3208
3209         if (!try_module_get(owner))
3210                 return -ENODEV;
3211
3212         WARN_CONSOLE_UNLOCKED();
3213
3214         /* check if driver is registered and if it is unbindable */
3215         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3216                 con_driver = &registered_con_driver[i];
3217
3218                 if (con_driver->con == csw &&
3219                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3220                         retval = 0;
3221                         break;
3222                 }
3223         }
3224
3225         if (retval)
3226                 goto err;
3227
3228         retval = -ENODEV;
3229
3230         /* check if backup driver exists */
3231         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3232                 con_back = &registered_con_driver[i];
3233
3234                 if (con_back->con && con_back->con != csw) {
3235                         defcsw = con_back->con;
3236                         retval = 0;
3237                         break;
3238                 }
3239         }
3240
3241         if (retval)
3242                 goto err;
3243
3244         if (!con_is_bound(csw))
3245                 goto err;
3246
3247         first = max(first, con_driver->first);
3248         last = min(last, con_driver->last);
3249
3250         for (i = first; i <= last; i++) {
3251                 if (con_driver_map[i] == csw) {
3252                         module_put(csw->owner);
3253                         con_driver_map[i] = NULL;
3254                 }
3255         }
3256
3257         if (!con_is_bound(defcsw)) {
3258                 const struct consw *defconsw = conswitchp;
3259
3260                 defcsw->con_startup();
3261                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3262                 /*
3263                  * vgacon may change the default driver to point
3264                  * to dummycon, we restore it here...
3265                  */
3266                 conswitchp = defconsw;
3267         }
3268
3269         if (!con_is_bound(csw))
3270                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3271
3272         /* ignore return value, binding should not fail */
3273         do_bind_con_driver(defcsw, first, last, deflt);
3274 err:
3275         module_put(owner);
3276         return retval;
3277
3278 }
3279 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3280
3281 static int vt_bind(struct con_driver *con)
3282 {
3283         const struct consw *defcsw = NULL, *csw = NULL;
3284         int i, more = 1, first = -1, last = -1, deflt = 0;
3285
3286         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3287                 goto err;
3288
3289         csw = con->con;
3290
3291         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3292                 struct con_driver *con = &registered_con_driver[i];
3293
3294                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3295                         defcsw = con->con;
3296                         break;
3297                 }
3298         }
3299
3300         if (!defcsw)
3301                 goto err;
3302
3303         while (more) {
3304                 more = 0;
3305
3306                 for (i = con->first; i <= con->last; i++) {
3307                         if (con_driver_map[i] == defcsw) {
3308                                 if (first == -1)
3309                                         first = i;
3310                                 last = i;
3311                                 more = 1;
3312                         } else if (first != -1)
3313                                 break;
3314                 }
3315
3316                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3317                         deflt = 1;
3318
3319                 if (first != -1)
3320                         do_bind_con_driver(csw, first, last, deflt);
3321
3322                 first = -1;
3323                 last = -1;
3324                 deflt = 0;
3325         }
3326
3327 err:
3328         return 0;
3329 }
3330
3331 static int vt_unbind(struct con_driver *con)
3332 {
3333         const struct consw *csw = NULL;
3334         int i, more = 1, first = -1, last = -1, deflt = 0;
3335         int ret;
3336
3337         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3338                 goto err;
3339
3340         csw = con->con;
3341
3342         while (more) {
3343                 more = 0;
3344
3345                 for (i = con->first; i <= con->last; i++) {
3346                         if (con_driver_map[i] == csw) {
3347                                 if (first == -1)
3348                                         first = i;
3349                                 last = i;
3350                                 more = 1;
3351                         } else if (first != -1)
3352                                 break;
3353                 }
3354
3355                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3356                         deflt = 1;
3357
3358                 if (first != -1) {
3359                         ret = do_unbind_con_driver(csw, first, last, deflt);
3360                         if (ret != 0)
3361                                 return ret;
3362                 }
3363
3364                 first = -1;
3365                 last = -1;
3366                 deflt = 0;
3367         }
3368
3369 err:
3370         return 0;
3371 }
3372 #else
3373 static inline int vt_bind(struct con_driver *con)
3374 {
3375         return 0;
3376 }
3377 static inline int vt_unbind(struct con_driver *con)
3378 {
3379         return 0;
3380 }
3381 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3382
3383 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3384                           const char *buf, size_t count)
3385 {
3386         struct con_driver *con = dev_get_drvdata(dev);
3387         int bind = simple_strtoul(buf, NULL, 0);
3388
3389         console_lock();
3390
3391         if (bind)
3392                 vt_bind(con);
3393         else
3394                 vt_unbind(con);
3395
3396         console_unlock();
3397
3398         return count;
3399 }
3400
3401 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3402                          char *buf)
3403 {
3404         struct con_driver *con = dev_get_drvdata(dev);
3405         int bind = con_is_bound(con->con);
3406
3407         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3408 }
3409
3410 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3411                          char *buf)
3412 {
3413         struct con_driver *con = dev_get_drvdata(dev);
3414
3415         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3416                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3417                          con->desc);
3418
3419 }
3420
3421 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3422 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3423
3424 static struct attribute *con_dev_attrs[] = {
3425         &dev_attr_bind.attr,
3426         &dev_attr_name.attr,
3427         NULL
3428 };
3429
3430 ATTRIBUTE_GROUPS(con_dev);
3431
3432 static int vtconsole_init_device(struct con_driver *con)
3433 {
3434         con->flag |= CON_DRIVER_FLAG_ATTR;
3435         return 0;
3436 }
3437
3438 static void vtconsole_deinit_device(struct con_driver *con)
3439 {
3440         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3441 }
3442
3443 /**
3444  * con_is_bound - checks if driver is bound to the console
3445  * @csw: console driver
3446  *
3447  * RETURNS: zero if unbound, nonzero if bound
3448  *
3449  * Drivers can call this and if zero, they should release
3450  * all resources allocated on con_startup()
3451  */
3452 int con_is_bound(const struct consw *csw)
3453 {
3454         int i, bound = 0;
3455
3456         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3457                 if (con_driver_map[i] == csw) {
3458                         bound = 1;
3459                         break;
3460                 }
3461         }
3462
3463         return bound;
3464 }
3465 EXPORT_SYMBOL(con_is_bound);
3466
3467 /**
3468  * con_debug_enter - prepare the console for the kernel debugger
3469  * @sw: console driver
3470  *
3471  * Called when the console is taken over by the kernel debugger, this
3472  * function needs to save the current console state, then put the console
3473  * into a state suitable for the kernel debugger.
3474  *
3475  * RETURNS:
3476  * Zero on success, nonzero if a failure occurred when trying to prepare
3477  * the console for the debugger.
3478  */
3479 int con_debug_enter(struct vc_data *vc)
3480 {
3481         int ret = 0;
3482
3483         saved_fg_console = fg_console;
3484         saved_last_console = last_console;
3485         saved_want_console = want_console;
3486         saved_vc_mode = vc->vc_mode;
3487         saved_console_blanked = console_blanked;
3488         vc->vc_mode = KD_TEXT;
3489         console_blanked = 0;
3490         if (vc->vc_sw->con_debug_enter)
3491                 ret = vc->vc_sw->con_debug_enter(vc);
3492 #ifdef CONFIG_KGDB_KDB
3493         /* Set the initial LINES variable if it is not already set */
3494         if (vc->vc_rows < 999) {
3495                 int linecount;
3496                 char lns[4];
3497                 const char *setargs[3] = {
3498                         "set",
3499                         "LINES",
3500                         lns,
3501                 };
3502                 if (kdbgetintenv(setargs[0], &linecount)) {
3503                         snprintf(lns, 4, "%i", vc->vc_rows);
3504                         kdb_set(2, setargs);
3505                 }
3506         }
3507         if (vc->vc_cols < 999) {
3508                 int colcount;
3509                 char cols[4];
3510                 const char *setargs[3] = {
3511                         "set",
3512                         "COLUMNS",
3513                         cols,
3514                 };
3515                 if (kdbgetintenv(setargs[0], &colcount)) {
3516                         snprintf(cols, 4, "%i", vc->vc_cols);
3517                         kdb_set(2, setargs);
3518                 }
3519         }
3520 #endif /* CONFIG_KGDB_KDB */
3521         return ret;
3522 }
3523 EXPORT_SYMBOL_GPL(con_debug_enter);
3524
3525 /**
3526  * con_debug_leave - restore console state
3527  * @sw: console driver
3528  *
3529  * Restore the console state to what it was before the kernel debugger
3530  * was invoked.
3531  *
3532  * RETURNS:
3533  * Zero on success, nonzero if a failure occurred when trying to restore
3534  * the console.
3535  */
3536 int con_debug_leave(void)
3537 {
3538         struct vc_data *vc;
3539         int ret = 0;
3540
3541         fg_console = saved_fg_console;
3542         last_console = saved_last_console;
3543         want_console = saved_want_console;
3544         console_blanked = saved_console_blanked;
3545         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3546
3547         vc = vc_cons[fg_console].d;
3548         if (vc->vc_sw->con_debug_leave)
3549                 ret = vc->vc_sw->con_debug_leave(vc);
3550         return ret;
3551 }
3552 EXPORT_SYMBOL_GPL(con_debug_leave);
3553
3554 static int do_register_con_driver(const struct consw *csw, int first, int last)
3555 {
3556         struct module *owner = csw->owner;
3557         struct con_driver *con_driver;
3558         const char *desc;
3559         int i, retval;
3560
3561         WARN_CONSOLE_UNLOCKED();
3562
3563         if (!try_module_get(owner))
3564                 return -ENODEV;
3565
3566         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3567                 con_driver = &registered_con_driver[i];
3568
3569                 /* already registered */
3570                 if (con_driver->con == csw) {
3571                         retval = -EBUSY;
3572                         goto err;
3573                 }
3574         }
3575
3576         desc = csw->con_startup();
3577         if (!desc) {
3578                 retval = -ENODEV;
3579                 goto err;
3580         }
3581
3582         retval = -EINVAL;
3583
3584         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3585                 con_driver = &registered_con_driver[i];
3586
3587                 if (con_driver->con == NULL &&
3588                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3589                         con_driver->con = csw;
3590                         con_driver->desc = desc;
3591                         con_driver->node = i;
3592                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3593                                            CON_DRIVER_FLAG_INIT;
3594                         con_driver->first = first;
3595                         con_driver->last = last;
3596                         retval = 0;
3597                         break;
3598                 }
3599         }
3600
3601         if (retval)
3602                 goto err;
3603
3604         con_driver->dev =
3605                 device_create_with_groups(vtconsole_class, NULL,
3606                                           MKDEV(0, con_driver->node),
3607                                           con_driver, con_dev_groups,
3608                                           "vtcon%i", con_driver->node);
3609         if (IS_ERR(con_driver->dev)) {
3610                 printk(KERN_WARNING "Unable to create device for %s; "
3611                        "errno = %ld\n", con_driver->desc,
3612                        PTR_ERR(con_driver->dev));
3613                 con_driver->dev = NULL;
3614         } else {
3615                 vtconsole_init_device(con_driver);
3616         }
3617
3618 err:
3619         module_put(owner);
3620         return retval;
3621 }
3622
3623
3624 /**
3625  * do_unregister_con_driver - unregister console driver from console layer
3626  * @csw: console driver
3627  *
3628  * DESCRIPTION: All drivers that registers to the console layer must
3629  * call this function upon exit, or if the console driver is in a state
3630  * where it won't be able to handle console services, such as the
3631  * framebuffer console without loaded framebuffer drivers.
3632  *
3633  * The driver must unbind first prior to unregistration.
3634  */
3635 int do_unregister_con_driver(const struct consw *csw)
3636 {
3637         int i;
3638
3639         /* cannot unregister a bound driver */
3640         if (con_is_bound(csw))
3641                 return -EBUSY;
3642
3643         if (csw == conswitchp)
3644                 return -EINVAL;
3645
3646         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3647                 struct con_driver *con_driver = &registered_con_driver[i];
3648
3649                 if (con_driver->con == csw) {
3650                         /*
3651                          * Defer the removal of the sysfs entries since that
3652                          * will acquire the kernfs s_active lock and we can't
3653                          * acquire this lock while holding the console lock:
3654                          * the unbind sysfs entry imposes already the opposite
3655                          * order. Reset con already here to prevent any later
3656                          * lookup to succeed and mark this slot as zombie, so
3657                          * it won't get reused until we complete the removal
3658                          * in the deferred work.
3659                          */
3660                         con_driver->con = NULL;
3661                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3662                         schedule_work(&con_driver_unregister_work);
3663
3664                         return 0;
3665                 }
3666         }
3667
3668         return -ENODEV;
3669 }
3670 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3671
3672 static void con_driver_unregister_callback(struct work_struct *ignored)
3673 {
3674         int i;
3675
3676         console_lock();
3677
3678         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3679                 struct con_driver *con_driver = &registered_con_driver[i];
3680
3681                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3682                         continue;
3683
3684                 console_unlock();
3685
3686                 vtconsole_deinit_device(con_driver);
3687                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3688
3689                 console_lock();
3690
3691                 if (WARN_ON_ONCE(con_driver->con))
3692                         con_driver->con = NULL;
3693                 con_driver->desc = NULL;
3694                 con_driver->dev = NULL;
3695                 con_driver->node = 0;
3696                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3697                 con_driver->flag = 0;
3698                 con_driver->first = 0;
3699                 con_driver->last = 0;
3700         }
3701
3702         console_unlock();
3703 }
3704
3705 /*
3706  *      If we support more console drivers, this function is used
3707  *      when a driver wants to take over some existing consoles
3708  *      and become default driver for newly opened ones.
3709  *
3710  *      do_take_over_console is basically a register followed by unbind
3711  */
3712 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3713 {
3714         int err;
3715
3716         err = do_register_con_driver(csw, first, last);
3717         /*
3718          * If we get an busy error we still want to bind the console driver
3719          * and return success, as we may have unbound the console driver
3720          * but not unregistered it.
3721          */
3722         if (err == -EBUSY)
3723                 err = 0;
3724         if (!err)
3725                 do_bind_con_driver(csw, first, last, deflt);
3726
3727         return err;
3728 }
3729 EXPORT_SYMBOL_GPL(do_take_over_console);
3730
3731
3732 /*
3733  * give_up_console is a wrapper to unregister_con_driver. It will only
3734  * work if driver is fully unbound.
3735  */
3736 void give_up_console(const struct consw *csw)
3737 {
3738         console_lock();
3739         do_unregister_con_driver(csw);
3740         console_unlock();
3741 }
3742
3743 static int __init vtconsole_class_init(void)
3744 {
3745         int i;
3746
3747         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3748         if (IS_ERR(vtconsole_class)) {
3749                 printk(KERN_WARNING "Unable to create vt console class; "
3750                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3751                 vtconsole_class = NULL;
3752         }
3753
3754         /* Add system drivers to sysfs */
3755         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3756                 struct con_driver *con = &registered_con_driver[i];
3757
3758                 if (con->con && !con->dev) {
3759                         con->dev =
3760                                 device_create_with_groups(vtconsole_class, NULL,
3761                                                           MKDEV(0, con->node),
3762                                                           con, con_dev_groups,
3763                                                           "vtcon%i", con->node);
3764
3765                         if (IS_ERR(con->dev)) {
3766                                 printk(KERN_WARNING "Unable to create "
3767                                        "device for %s; errno = %ld\n",
3768                                        con->desc, PTR_ERR(con->dev));
3769                                 con->dev = NULL;
3770                         } else {
3771                                 vtconsole_init_device(con);
3772                         }
3773                 }
3774         }
3775
3776         return 0;
3777 }
3778 postcore_initcall(vtconsole_class_init);
3779
3780 #endif
3781
3782 /*
3783  *      Screen blanking
3784  */
3785
3786 static int set_vesa_blanking(char __user *p)
3787 {
3788         unsigned int mode;
3789
3790         if (get_user(mode, p + 1))
3791                 return -EFAULT;
3792
3793         vesa_blank_mode = (mode < 4) ? mode : 0;
3794         return 0;
3795 }
3796
3797 void do_blank_screen(int entering_gfx)
3798 {
3799         struct vc_data *vc = vc_cons[fg_console].d;
3800         int i;
3801
3802         WARN_CONSOLE_UNLOCKED();
3803
3804         if (console_blanked) {
3805                 if (blank_state == blank_vesa_wait) {
3806                         blank_state = blank_off;
3807                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3808                 }
3809                 return;
3810         }
3811
3812         /* entering graphics mode? */
3813         if (entering_gfx) {
3814                 hide_cursor(vc);
3815                 save_screen(vc);
3816                 vc->vc_sw->con_blank(vc, -1, 1);
3817                 console_blanked = fg_console + 1;
3818                 blank_state = blank_off;
3819                 set_origin(vc);
3820                 return;
3821         }
3822
3823         if (blank_state != blank_normal_wait)
3824                 return;
3825         blank_state = blank_off;
3826
3827         /* don't blank graphics */
3828         if (vc->vc_mode != KD_TEXT) {
3829                 console_blanked = fg_console + 1;
3830                 return;
3831         }
3832
3833         hide_cursor(vc);
3834         del_timer_sync(&console_timer);
3835         blank_timer_expired = 0;
3836
3837         save_screen(vc);
3838         /* In case we need to reset origin, blanking hook returns 1 */
3839         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3840         console_blanked = fg_console + 1;
3841         if (i)
3842                 set_origin(vc);
3843
3844         if (console_blank_hook && console_blank_hook(1))
3845                 return;
3846
3847         if (vesa_off_interval && vesa_blank_mode) {
3848                 blank_state = blank_vesa_wait;
3849                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3850         }
3851         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3852 }
3853 EXPORT_SYMBOL(do_blank_screen);
3854
3855 /*
3856  * Called by timer as well as from vt_console_driver
3857  */
3858 void do_unblank_screen(int leaving_gfx)
3859 {
3860         struct vc_data *vc;
3861
3862         /* This should now always be called from a "sane" (read: can schedule)
3863          * context for the sake of the low level drivers, except in the special
3864          * case of oops_in_progress
3865          */
3866         if (!oops_in_progress)
3867                 might_sleep();
3868
3869         WARN_CONSOLE_UNLOCKED();
3870
3871         ignore_poke = 0;
3872         if (!console_blanked)
3873                 return;
3874         if (!vc_cons_allocated(fg_console)) {
3875                 /* impossible */
3876                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3877                         fg_console + 1);
3878                 return;
3879         }
3880         vc = vc_cons[fg_console].d;
3881         /* Try to unblank in oops case too */
3882         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3883                 return; /* but leave console_blanked != 0 */
3884
3885         if (blankinterval) {
3886                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3887                 blank_state = blank_normal_wait;
3888         }
3889
3890         console_blanked = 0;
3891         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3892                 /* Low-level driver cannot restore -> do it ourselves */
3893                 update_screen(vc);
3894         if (console_blank_hook)
3895                 console_blank_hook(0);
3896         set_palette(vc);
3897         set_cursor(vc);
3898         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3899 }
3900 EXPORT_SYMBOL(do_unblank_screen);
3901
3902 /*
3903  * This is called by the outside world to cause a forced unblank, mostly for
3904  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3905  * call it with 1 as an argument and so force a mode restore... that may kill
3906  * X or at least garbage the screen but would also make the Oops visible...
3907  */
3908 void unblank_screen(void)
3909 {
3910         do_unblank_screen(0);
3911 }
3912
3913 /*
3914  * We defer the timer blanking to work queue so it can take the console mutex
3915  * (console operations can still happen at irq time, but only from printk which
3916  * has the console mutex. Not perfect yet, but better than no locking
3917  */
3918 static void blank_screen_t(unsigned long dummy)
3919 {
3920         if (unlikely(!keventd_up())) {
3921                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3922                 return;
3923         }
3924         blank_timer_expired = 1;
3925         schedule_work(&console_work);
3926 }
3927
3928 void poke_blanked_console(void)
3929 {
3930         WARN_CONSOLE_UNLOCKED();
3931
3932         /* Add this so we quickly catch whoever might call us in a non
3933          * safe context. Nowadays, unblank_screen() isn't to be called in
3934          * atomic contexts and is allowed to schedule (with the special case
3935          * of oops_in_progress, but that isn't of any concern for this
3936          * function. --BenH.
3937          */
3938         might_sleep();
3939
3940         /* This isn't perfectly race free, but a race here would be mostly harmless,
3941          * at worse, we'll do a spurrious blank and it's unlikely
3942          */
3943         del_timer(&console_timer);
3944         blank_timer_expired = 0;
3945
3946         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3947                 return;
3948         if (console_blanked)
3949                 unblank_screen();
3950         else if (blankinterval) {
3951                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3952                 blank_state = blank_normal_wait;
3953         }
3954 }
3955
3956 /*
3957  *      Palettes
3958  */
3959
3960 static void set_palette(struct vc_data *vc)
3961 {
3962         WARN_CONSOLE_UNLOCKED();
3963
3964         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3965                 vc->vc_sw->con_set_palette(vc, color_table);
3966 }
3967
3968 /*
3969  * Load palette into the DAC registers. arg points to a colour
3970  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3971  */
3972
3973 int con_set_cmap(unsigned char __user *arg)
3974 {
3975         int i, j, k;
3976         unsigned char colormap[3*16];
3977
3978         if (copy_from_user(colormap, arg, sizeof(colormap)))
3979                 return -EFAULT;
3980
3981         console_lock();
3982         for (i = k = 0; i < 16; i++) {
3983                 default_red[i] = colormap[k++];
3984                 default_grn[i] = colormap[k++];
3985                 default_blu[i] = colormap[k++];
3986         }
3987         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3988                 if (!vc_cons_allocated(i))
3989                         continue;
3990                 for (j = k = 0; j < 16; j++) {
3991                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3992                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3993                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3994                 }
3995                 set_palette(vc_cons[i].d);
3996         }
3997         console_unlock();
3998
3999         return 0;
4000 }
4001
4002 int con_get_cmap(unsigned char __user *arg)
4003 {
4004         int i, k;
4005         unsigned char colormap[3*16];
4006
4007         console_lock();
4008         for (i = k = 0; i < 16; i++) {
4009                 colormap[k++] = default_red[i];
4010                 colormap[k++] = default_grn[i];
4011                 colormap[k++] = default_blu[i];
4012         }
4013         console_unlock();
4014
4015         if (copy_to_user(arg, colormap, sizeof(colormap)))
4016                 return -EFAULT;
4017
4018         return 0;
4019 }
4020
4021 void reset_palette(struct vc_data *vc)
4022 {
4023         int j, k;
4024         for (j=k=0; j<16; j++) {
4025                 vc->vc_palette[k++] = default_red[j];
4026                 vc->vc_palette[k++] = default_grn[j];
4027                 vc->vc_palette[k++] = default_blu[j];
4028         }
4029         set_palette(vc);
4030 }
4031
4032 /*
4033  *  Font switching
4034  *
4035  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4036  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4037  *  depending on width) reserved for each character which is kinda wasty, but
4038  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4039  *  is up to the actual low-level console-driver convert data into its favorite
4040  *  format (maybe we should add a `fontoffset' field to the `display'
4041  *  structure so we won't have to convert the fontdata all the time.
4042  *  /Jes
4043  */
4044
4045 #define max_font_size 65536
4046
4047 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4048 {
4049         struct console_font font;
4050         int rc = -EINVAL;
4051         int c;
4052
4053         if (op->data) {
4054                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4055                 if (!font.data)
4056                         return -ENOMEM;
4057         } else
4058                 font.data = NULL;
4059
4060         console_lock();
4061         if (vc->vc_mode != KD_TEXT)
4062                 rc = -EINVAL;
4063         else if (vc->vc_sw->con_font_get)
4064                 rc = vc->vc_sw->con_font_get(vc, &font);
4065         else
4066                 rc = -ENOSYS;
4067         console_unlock();
4068
4069         if (rc)
4070                 goto out;
4071
4072         c = (font.width+7)/8 * 32 * font.charcount;
4073
4074         if (op->data && font.charcount > op->charcount)
4075                 rc = -ENOSPC;
4076         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4077                 if (font.width > op->width || font.height > op->height)
4078                         rc = -ENOSPC;
4079         } else {
4080                 if (font.width != 8)
4081                         rc = -EIO;
4082                 else if ((op->height && font.height > op->height) ||
4083                          font.height > 32)
4084                         rc = -ENOSPC;
4085         }
4086         if (rc)
4087                 goto out;
4088
4089         op->height = font.height;
4090         op->width = font.width;
4091         op->charcount = font.charcount;
4092
4093         if (op->data && copy_to_user(op->data, font.data, c))
4094                 rc = -EFAULT;
4095
4096 out:
4097         kfree(font.data);
4098         return rc;
4099 }
4100
4101 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4102 {
4103         struct console_font font;
4104         int rc = -EINVAL;
4105         int size;
4106
4107         if (vc->vc_mode != KD_TEXT)
4108                 return -EINVAL;
4109         if (!op->data)
4110                 return -EINVAL;
4111         if (op->charcount > 512)
4112                 return -EINVAL;
4113         if (!op->height) {              /* Need to guess font height [compat] */
4114                 int h, i;
4115                 u8 __user *charmap = op->data;
4116                 u8 tmp;
4117
4118                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4119                    so that we can get rid of this soon */
4120                 if (!(op->flags & KD_FONT_FLAG_OLD))
4121                         return -EINVAL;
4122                 for (h = 32; h > 0; h--)
4123                         for (i = 0; i < op->charcount; i++) {
4124                                 if (get_user(tmp, &charmap[32*i+h-1]))
4125                                         return -EFAULT;
4126                                 if (tmp)
4127                                         goto nonzero;
4128                         }
4129                 return -EINVAL;
4130         nonzero:
4131                 op->height = h;
4132         }
4133         if (op->width <= 0 || op->width > 32 || op->height > 32)
4134                 return -EINVAL;
4135         size = (op->width+7)/8 * 32 * op->charcount;
4136         if (size > max_font_size)
4137                 return -ENOSPC;
4138         font.charcount = op->charcount;
4139         font.height = op->height;
4140         font.width = op->width;
4141         font.data = memdup_user(op->data, size);
4142         if (IS_ERR(font.data))
4143                 return PTR_ERR(font.data);
4144         console_lock();
4145         if (vc->vc_mode != KD_TEXT)
4146                 rc = -EINVAL;
4147         else if (vc->vc_sw->con_font_set)
4148                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4149         else
4150                 rc = -ENOSYS;
4151         console_unlock();
4152         kfree(font.data);
4153         return rc;
4154 }
4155
4156 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4157 {
4158         struct console_font font = {.width = op->width, .height = op->height};
4159         char name[MAX_FONT_NAME];
4160         char *s = name;
4161         int rc;
4162
4163
4164         if (!op->data)
4165                 s = NULL;
4166         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4167                 return -EFAULT;
4168         else
4169                 name[MAX_FONT_NAME - 1] = 0;
4170
4171         console_lock();
4172         if (vc->vc_mode != KD_TEXT) {
4173                 console_unlock();
4174                 return -EINVAL;
4175         }
4176         if (vc->vc_sw->con_font_default)
4177                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4178         else
4179                 rc = -ENOSYS;
4180         console_unlock();
4181         if (!rc) {
4182                 op->width = font.width;
4183                 op->height = font.height;
4184         }
4185         return rc;
4186 }
4187
4188 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4189 {
4190         int con = op->height;
4191         int rc;
4192
4193
4194         console_lock();
4195         if (vc->vc_mode != KD_TEXT)
4196                 rc = -EINVAL;
4197         else if (!vc->vc_sw->con_font_copy)
4198                 rc = -ENOSYS;
4199         else if (con < 0 || !vc_cons_allocated(con))
4200                 rc = -ENOTTY;
4201         else if (con == vc->vc_num)     /* nothing to do */
4202                 rc = 0;
4203         else
4204                 rc = vc->vc_sw->con_font_copy(vc, con);
4205         console_unlock();
4206         return rc;
4207 }
4208
4209 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4210 {
4211         switch (op->op) {
4212         case KD_FONT_OP_SET:
4213                 return con_font_set(vc, op);
4214         case KD_FONT_OP_GET:
4215                 return con_font_get(vc, op);
4216         case KD_FONT_OP_SET_DEFAULT:
4217                 return con_font_default(vc, op);
4218         case KD_FONT_OP_COPY:
4219                 return con_font_copy(vc, op);
4220         }
4221         return -ENOSYS;
4222 }
4223
4224 /*
4225  *      Interface exported to selection and vcs.
4226  */
4227
4228 /* used by selection */
4229 u16 screen_glyph(struct vc_data *vc, int offset)
4230 {
4231         u16 w = scr_readw(screenpos(vc, offset, 1));
4232         u16 c = w & 0xff;
4233
4234         if (w & vc->vc_hi_font_mask)
4235                 c |= 0x100;
4236         return c;
4237 }
4238 EXPORT_SYMBOL_GPL(screen_glyph);
4239
4240 /* used by vcs - note the word offset */
4241 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4242 {
4243         return screenpos(vc, 2 * w_offset, viewed);
4244 }
4245 EXPORT_SYMBOL_GPL(screen_pos);
4246
4247 void getconsxy(struct vc_data *vc, unsigned char *p)
4248 {
4249         p[0] = vc->vc_x;
4250         p[1] = vc->vc_y;
4251 }
4252
4253 void putconsxy(struct vc_data *vc, unsigned char *p)
4254 {
4255         hide_cursor(vc);
4256         gotoxy(vc, p[0], p[1]);
4257         set_cursor(vc);
4258 }
4259
4260 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4261 {
4262         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4263                 return softcursor_original;
4264         return scr_readw(org);
4265 }
4266
4267 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4268 {
4269         scr_writew(val, org);
4270         if ((unsigned long)org == vc->vc_pos) {
4271                 softcursor_original = -1;
4272                 add_softcursor(vc);
4273         }
4274 }
4275
4276 void vcs_scr_updated(struct vc_data *vc)
4277 {
4278         notify_update(vc);
4279 }
4280
4281 /*
4282  *      Visible symbols for modules
4283  */
4284
4285 EXPORT_SYMBOL(color_table);
4286 EXPORT_SYMBOL(default_red);
4287 EXPORT_SYMBOL(default_grn);
4288 EXPORT_SYMBOL(default_blu);
4289 EXPORT_SYMBOL(update_region);
4290 EXPORT_SYMBOL(redraw_screen);
4291 EXPORT_SYMBOL(vc_resize);
4292 EXPORT_SYMBOL(fg_console);
4293 EXPORT_SYMBOL(console_blank_hook);
4294 EXPORT_SYMBOL(console_blanked);
4295 EXPORT_SYMBOL(vc_cons);
4296 EXPORT_SYMBOL(global_cursor_default);
4297 #ifndef VT_SINGLE_DRIVER
4298 EXPORT_SYMBOL(give_up_console);
4299 #endif