kernel/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
 282 #ifdef VT_BUF_VRAM_ONLY
 283 #define DO_UPDATE(vc)   0
 284 #else
 285 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 286 #endif
 287
 288 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 289 {
 290         unsigned short *p;
 291
 292         if (!viewed)
 293                 p = (unsigned short *)(vc->vc_origin + offset);
 294         else if (!vc->vc_sw->con_screen_pos)
 295                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 296         else
 297                 p = vc->vc_sw->con_screen_pos(vc, offset);
 298         return p;
 299 }
 300
 301 /* Called  from the keyboard irq path.. */
 302 static inline void scrolldelta(int lines)
 303 {
 304         /* FIXME */
 305         /* scrolldelta needs some kind of consistency lock, but the BKL was
 306            and still is not protecting versus the scheduled back end */
 307         scrollback_delta += lines;
 308         schedule_console_callback();
 309 }
 310
 311 void schedule_console_callback(void)
 312 {
 313         schedule_work(&console_work);
 314 }
 315
 316 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 317 {
 318         unsigned short *d, *s;
 319
 320         if (t+nr >= b)
 321                 nr = b - t - 1;
 322         if (b > vc->vc_rows || t >= b || nr < 1)
 323                 return;
 324         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 325                 return;
 326         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 327         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 328         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 329         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 330                     vc->vc_size_row * nr);
 331 }
 332
 333 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 334 {
 335         unsigned short *s;
 336         unsigned int step;
 337
 338         if (t+nr >= b)
 339                 nr = b - t - 1;
 340         if (b > vc->vc_rows || t >= b || nr < 1)
 341                 return;
 342         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 343                 return;
 344         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 345         step = vc->vc_cols * nr;
 346         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 347         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 348 }
 349
 350 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 351 {
 352 #ifndef VT_BUF_VRAM_ONLY
 353         unsigned int xx, yy, offset;
 354         u16 *p;
 355
 356         p = (u16 *) start;
 357         if (!vc->vc_sw->con_getxy) {
 358                 offset = (start - vc->vc_origin) / 2;
 359                 xx = offset % vc->vc_cols;
 360                 yy = offset / vc->vc_cols;
 361         } else {
 362                 int nxx, nyy;
 363                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 364                 xx = nxx; yy = nyy;
 365         }
 366         for(;;) {
 367                 u16 attrib = scr_readw(p) & 0xff00;
 368                 int startx = xx;
 369                 u16 *q = p;
 370                 while (xx < vc->vc_cols && count) {
 371                         if (attrib != (scr_readw(p) & 0xff00)) {
 372                                 if (p > q)
 373                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 374                                 startx = xx;
 375                                 q = p;
 376                                 attrib = scr_readw(p) & 0xff00;
 377                         }
 378                         p++;
 379                         xx++;
 380                         count--;
 381                 }
 382                 if (p > q)
 383                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 384                 if (!count)
 385                         break;
 386                 xx = 0;
 387                 yy++;
 388                 if (vc->vc_sw->con_getxy) {
 389                         p = (u16 *)start;
 390                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 391                 }
 392         }
 393 #endif
 394 }
 395
 396 void update_region(struct vc_data *vc, unsigned long start, int count)
 397 {
 398         WARN_CONSOLE_UNLOCKED();
 399
 400         if (DO_UPDATE(vc)) {
 401                 hide_cursor(vc);
 402                 do_update_region(vc, start, count);
 403                 set_cursor(vc);
 404         }
 405 }
 406
 407 /* Structure of attributes is hardware-dependent */
 408
 409 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 410     u8 _underline, u8 _reverse, u8 _italic)
 411 {
 412         if (vc->vc_sw->con_build_attr)
 413                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 414                        _blink, _underline, _reverse, _italic);
 415
 416 #ifndef VT_BUF_VRAM_ONLY
 417 /*
 418  * ++roman: I completely changed the attribute format for monochrome
 419  * mode (!can_do_color). The formerly used MDA (monochrome display
 420  * adapter) format didn't allow the combination of certain effects.
 421  * Now the attribute is just a bit vector:
 422  *  Bit 0..1: intensity (0..2)
 423  *  Bit 2   : underline
 424  *  Bit 3   : reverse
 425  *  Bit 7   : blink
 426  */
 427         {
 428         u8 a = _color;
 429         if (!vc->vc_can_do_color)
 430                 return _intensity |
 431                        (_italic ? 2 : 0) |
 432                        (_underline ? 4 : 0) |
 433                        (_reverse ? 8 : 0) |
 434                        (_blink ? 0x80 : 0);
 435         if (_italic)
 436                 a = (a & 0xF0) | vc->vc_itcolor;
 437         else if (_underline)
 438                 a = (a & 0xf0) | vc->vc_ulcolor;
 439         else if (_intensity == 0)
 440                 a = (a & 0xf0) | vc->vc_ulcolor;
 441         if (_reverse)
 442                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 443         if (_blink)
 444                 a ^= 0x80;
 445         if (_intensity == 2)
 446                 a ^= 0x08;
 447         if (vc->vc_hi_font_mask == 0x100)
 448                 a <<= 1;
 449         return a;
 450         }
 451 #else
 452         return 0;
 453 #endif
 454 }
 455
 456 static void update_attr(struct vc_data *vc)
 457 {
 458         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 459                       vc->vc_blink, vc->vc_underline,
 460                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 461         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 462 }
 463
 464 /* Note: inverting the screen twice should revert to the original state */
 465 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 466 {
 467         unsigned short *p;
 468
 469         WARN_CONSOLE_UNLOCKED();
 470
 471         count /= 2;
 472         p = screenpos(vc, offset, viewed);
 473         if (vc->vc_sw->con_invert_region)
 474                 vc->vc_sw->con_invert_region(vc, p, count);
 475 #ifndef VT_BUF_VRAM_ONLY
 476         else {
 477                 u16 *q = p;
 478                 int cnt = count;
 479                 u16 a;
 480
 481                 if (!vc->vc_can_do_color) {
 482                         while (cnt--) {
 483                             a = scr_readw(q);
 484                             a ^= 0x0800;
 485                             scr_writew(a, q);
 486                             q++;
 487                         }
 488                 } else if (vc->vc_hi_font_mask == 0x100) {
 489                         while (cnt--) {
 490                                 a = scr_readw(q);
 491                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 492                                 scr_writew(a, q);
 493                                 q++;
 494                         }
 495                 } else {
 496                         while (cnt--) {
 497                                 a = scr_readw(q);
 498                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 499                                 scr_writew(a, q);
 500                                 q++;
 501                         }
 502                 }
 503         }
 504 #endif
 505         if (DO_UPDATE(vc))
 506                 do_update_region(vc, (unsigned long) p, count);
 507         notify_update(vc);
 508 }
 509
 510 /* used by selection: complement pointer position */
 511 void complement_pos(struct vc_data *vc, int offset)
 512 {
 513         static int old_offset = -1;
 514         static unsigned short old;
 515         static unsigned short oldx, oldy;
 516
 517         WARN_CONSOLE_UNLOCKED();
 518
 519         if (old_offset != -1 && old_offset >= 0 &&
 520             old_offset < vc->vc_screenbuf_size) {
 521                 scr_writew(old, screenpos(vc, old_offset, 1));
 522                 if (DO_UPDATE(vc))
 523                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 524                 notify_update(vc);
 525         }
 526
 527         old_offset = offset;
 528
 529         if (offset != -1 && offset >= 0 &&
 530             offset < vc->vc_screenbuf_size) {
 531                 unsigned short new;
 532                 unsigned short *p;
 533                 p = screenpos(vc, offset, 1);
 534                 old = scr_readw(p);
 535                 new = old ^ vc->vc_complement_mask;
 536                 scr_writew(new, p);
 537                 if (DO_UPDATE(vc)) {
 538                         oldx = (offset >> 1) % vc->vc_cols;
 539                         oldy = (offset >> 1) / vc->vc_cols;
 540                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 541                 }
 542                 notify_update(vc);
 543         }
 544 }
 545
 546 static void insert_char(struct vc_data *vc, unsigned int nr)
 547 {
 548         unsigned short *p = (unsigned short *) vc->vc_pos;
 549
 550         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 551         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 552         vc->vc_need_wrap = 0;
 553         if (DO_UPDATE(vc))
 554                 do_update_region(vc, (unsigned long) p,
 555                         vc->vc_cols - vc->vc_x);
 556 }
 557
 558 static void delete_char(struct vc_data *vc, unsigned int nr)
 559 {
 560         unsigned short *p = (unsigned short *) vc->vc_pos;
 561
 562         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 563         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 564                         nr * 2);
 565         vc->vc_need_wrap = 0;
 566         if (DO_UPDATE(vc))
 567                 do_update_region(vc, (unsigned long) p,
 568                         vc->vc_cols - vc->vc_x);
 569 }
 570
 571 static int softcursor_original;
 572
 573 static void add_softcursor(struct vc_data *vc)
 574 {
 575         int i = scr_readw((u16 *) vc->vc_pos);
 576         u32 type = vc->vc_cursor_type;
 577
 578         if (! (type & 0x10)) return;
 579         if (softcursor_original != -1) return;
 580         softcursor_original = i;
 581         i |= ((type >> 8) & 0xff00 );
 582         i ^= ((type) & 0xff00 );
 583         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 584         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 585         scr_writew(i, (u16 *) vc->vc_pos);
 586         if (DO_UPDATE(vc))
 587                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 588 }
 589
 590 static void hide_softcursor(struct vc_data *vc)
 591 {
 592         if (softcursor_original != -1) {
 593                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 594                 if (DO_UPDATE(vc))
 595                         vc->vc_sw->con_putc(vc, softcursor_original,
 596                                         vc->vc_y, vc->vc_x);
 597                 softcursor_original = -1;
 598         }
 599 }
 600
 601 static void hide_cursor(struct vc_data *vc)
 602 {
 603         if (vc == sel_cons)
 604                 clear_selection();
 605         vc->vc_sw->con_cursor(vc, CM_ERASE);
 606         hide_softcursor(vc);
 607 }
 608
 609 static void set_cursor(struct vc_data *vc)
 610 {
 611         if (!IS_FG(vc) || console_blanked ||
 612             vc->vc_mode == KD_GRAPHICS)
 613                 return;
 614         if (vc->vc_deccm) {
 615                 if (vc == sel_cons)
 616                         clear_selection();
 617                 add_softcursor(vc);
 618                 if ((vc->vc_cursor_type & 0x0f) != 1)
 619                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 620         } else
 621                 hide_cursor(vc);
 622 }
 623
 624 static void set_origin(struct vc_data *vc)
 625 {
 626         WARN_CONSOLE_UNLOCKED();
 627
 628         if (!CON_IS_VISIBLE(vc) ||
 629             !vc->vc_sw->con_set_origin ||
 630             !vc->vc_sw->con_set_origin(vc))
 631                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 632         vc->vc_visible_origin = vc->vc_origin;
 633         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 634         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 635 }
 636
 637 static inline void save_screen(struct vc_data *vc)
 638 {
 639         WARN_CONSOLE_UNLOCKED();
 640
 641         if (vc->vc_sw->con_save_screen)
 642                 vc->vc_sw->con_save_screen(vc);
 643 }
 644
 645 /*
 646  *      Redrawing of screen
 647  */
 648
 649 void clear_buffer_attributes(struct vc_data *vc)
 650 {
 651         unsigned short *p = (unsigned short *)vc->vc_origin;
 652         int count = vc->vc_screenbuf_size / 2;
 653         int mask = vc->vc_hi_font_mask | 0xff;
 654
 655         for (; count > 0; count--, p++) {
 656                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 657         }
 658 }
 659
 660 void redraw_screen(struct vc_data *vc, int is_switch)
 661 {
 662         int redraw = 0;
 663
 664         WARN_CONSOLE_UNLOCKED();
 665
 666         if (!vc) {
 667                 /* strange ... */
 668                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 669                 return;
 670         }
 671
 672         if (is_switch) {
 673                 struct vc_data *old_vc = vc_cons[fg_console].d;
 674                 if (old_vc == vc)
 675                         return;
 676                 if (!CON_IS_VISIBLE(vc))
 677                         redraw = 1;
 678                 *vc->vc_display_fg = vc;
 679                 fg_console = vc->vc_num;
 680                 hide_cursor(old_vc);
 681                 if (!CON_IS_VISIBLE(old_vc)) {
 682                         save_screen(old_vc);
 683                         set_origin(old_vc);
 684                 }
 685                 if (tty0dev)
 686                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 687         } else {
 688                 hide_cursor(vc);
 689                 redraw = 1;
 690         }
 691
 692         if (redraw) {
 693                 int update;
 694                 int old_was_color = vc->vc_can_do_color;
 695
 696                 set_origin(vc);
 697                 update = vc->vc_sw->con_switch(vc);
 698                 set_palette(vc);
 699                 /*
 700                  * If console changed from mono<->color, the best we can do
 701                  * is to clear the buffer attributes. As it currently stands,
 702                  * rebuilding new attributes from the old buffer is not doable
 703                  * without overly complex code.
 704                  */
 705                 if (old_was_color != vc->vc_can_do_color) {
 706                         update_attr(vc);
 707                         clear_buffer_attributes(vc);
 708                 }
 709
 710                 /* Forcibly update if we're panicing */
 711                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 712                     vt_force_oops_output(vc))
 713                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 714         }
 715         set_cursor(vc);
 716         if (is_switch) {
 717                 set_leds();
 718                 compute_shiftstate();
 719                 notify_update(vc);
 720         }
 721 }
 722
 723 /*
 724  *      Allocation, freeing and resizing of VTs.
 725  */
 726
 727 int vc_cons_allocated(unsigned int i)
 728 {
 729         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 730 }
 731
 732 static void visual_init(struct vc_data *vc, int num, int init)
 733 {
 734         /* ++Geert: vc->vc_sw->con_init determines console size */
 735         if (vc->vc_sw)
 736                 module_put(vc->vc_sw->owner);
 737         vc->vc_sw = conswitchp;
 738 #ifndef VT_SINGLE_DRIVER
 739         if (con_driver_map[num])
 740                 vc->vc_sw = con_driver_map[num];
 741 #endif
 742         __module_get(vc->vc_sw->owner);
 743         vc->vc_num = num;
 744         vc->vc_display_fg = &master_display_fg;
 745         if (vc->vc_uni_pagedir_loc)
 746                 con_free_unimap(vc);
 747         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 748         vc->vc_uni_pagedir = NULL;
 749         vc->vc_hi_font_mask = 0;
 750         vc->vc_complement_mask = 0;
 751         vc->vc_can_do_color = 0;
 752         vc->vc_panic_force_write = false;
 753         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
 754         vc->vc_sw->con_init(vc, init);
 755         if (!vc->vc_complement_mask)
 756                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 757         vc->vc_s_complement_mask = vc->vc_complement_mask;
 758         vc->vc_size_row = vc->vc_cols << 1;
 759         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 760 }
 761
 762 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 763 {
 764         WARN_CONSOLE_UNLOCKED();
 765
 766         if (currcons >= MAX_NR_CONSOLES)
 767                 return -ENXIO;
 768         if (!vc_cons[currcons].d) {
 769             struct vc_data *vc;
 770             struct vt_notifier_param param;
 771
 772             /* prevent users from taking too much memory */
 773             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 774               return -EPERM;
 775
 776             /* due to the granularity of kmalloc, we waste some memory here */
 777             /* the alloc is done in two steps, to optimize the common situation
 778                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 779             /* although the numbers above are not valid since long ago, the
 780                point is still up-to-date and the comment still has its value
 781                even if only as a historical artifact.  --mj, July 1998 */
 782             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 783             if (!vc)
 784                 return -ENOMEM;
 785             vc_cons[currcons].d = vc;
 786             tty_port_init(&vc->port);
 787             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 788             visual_init(vc, currcons, 1);
 789             if (!*vc->vc_uni_pagedir_loc)
 790                 con_set_default_unimap(vc);
 791             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 792             if (!vc->vc_screenbuf) {
 793                 kfree(vc);
 794                 vc_cons[currcons].d = NULL;
 795                 return -ENOMEM;
 796             }
 797
 798             /* If no drivers have overridden us and the user didn't pass a
 799                boot option, default to displaying the cursor */
 800             if (global_cursor_default == -1)
 801                     global_cursor_default = 1;
 802
 803             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 804             vcs_make_sysfs(currcons);
 805             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 806         }
 807         return 0;
 808 }
 809
 810 static inline int resize_screen(struct vc_data *vc, int width, int height,
 811                                 int user)
 812 {
 813         /* Resizes the resolution of the display adapater */
 814         int err = 0;
 815
 816         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 817                 err = vc->vc_sw->con_resize(vc, width, height, user);
 818
 819         return err;
 820 }
 821
 822 /*
 823  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 824  * [this is to be used together with some user program
 825  * like resize that changes the hardware videomode]
 826  */
 827 #define VC_RESIZE_MAXCOL (32767)
 828 #define VC_RESIZE_MAXROW (32767)
 829
 830 /**
 831  *      vc_do_resize    -       resizing method for the tty
 832  *      @tty: tty being resized
 833  *      @real_tty: real tty (different to tty if a pty/tty pair)
 834  *      @vc: virtual console private data
 835  *      @cols: columns
 836  *      @lines: lines
 837  *
 838  *      Resize a virtual console, clipping according to the actual constraints.
 839  *      If the caller passes a tty structure then update the termios winsize
 840  *      information and perform any necessary signal handling.
 841  *
 842  *      Caller must hold the console semaphore. Takes the termios rwsem and
 843  *      ctrl_lock of the tty IFF a tty is passed.
 844  */
 845
 846 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 847                                 unsigned int cols, unsigned int lines)
 848 {
 849         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 850         unsigned long end;
 851         unsigned int old_rows, old_row_size;
 852         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 853         unsigned int user;
 854         unsigned short *newscreen;
 855
 856         WARN_CONSOLE_UNLOCKED();
 857
 858         if (!vc)
 859                 return -ENXIO;
 860
 861         user = vc->vc_resize_user;
 862         vc->vc_resize_user = 0;
 863
 864         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 865                 return -EINVAL;
 866
 867         new_cols = (cols ? cols : vc->vc_cols);
 868         new_rows = (lines ? lines : vc->vc_rows);
 869         new_row_size = new_cols << 1;
 870         new_screen_size = new_row_size * new_rows;
 871
 872         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 873                 return 0;
 874
 875         if (new_screen_size > (4 << 20))
 876                 return -EINVAL;
 877         newscreen = kmalloc(new_screen_size, GFP_USER);
 878         if (!newscreen)
 879                 return -ENOMEM;
 880
 881         if (vc == sel_cons)
 882                 clear_selection();
 883
 884         old_rows = vc->vc_rows;
 885         old_row_size = vc->vc_size_row;
 886
 887         err = resize_screen(vc, new_cols, new_rows, user);
 888         if (err) {
 889                 kfree(newscreen);
 890                 return err;
 891         }
 892
 893         vc->vc_rows = new_rows;
 894         vc->vc_cols = new_cols;
 895         vc->vc_size_row = new_row_size;
 896         vc->vc_screenbuf_size = new_screen_size;
 897
 898         rlth = min(old_row_size, new_row_size);
 899         rrem = new_row_size - rlth;
 900         old_origin = vc->vc_origin;
 901         new_origin = (long) newscreen;
 902         new_scr_end = new_origin + new_screen_size;
 903
 904         if (vc->vc_y > new_rows) {
 905                 if (old_rows - vc->vc_y < new_rows) {
 906                         /*
 907                          * Cursor near the bottom, copy contents from the
 908                          * bottom of buffer
 909                          */
 910                         old_origin += (old_rows - new_rows) * old_row_size;
 911                 } else {
 912                         /*
 913                          * Cursor is in no man's land, copy 1/2 screenful
 914                          * from the top and bottom of cursor position
 915                          */
 916                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 917                 }
 918         }
 919
 920         end = old_origin + old_row_size * min(old_rows, new_rows);
 921
 922         update_attr(vc);
 923
 924         while (old_origin < end) {
 925                 scr_memcpyw((unsigned short *) new_origin,
 926                             (unsigned short *) old_origin, rlth);
 927                 if (rrem)
 928                         scr_memsetw((void *)(new_origin + rlth),
 929                                     vc->vc_video_erase_char, rrem);
 930                 old_origin += old_row_size;
 931                 new_origin += new_row_size;
 932         }
 933         if (new_scr_end > new_origin)
 934                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 935                             new_scr_end - new_origin);
 936         kfree(vc->vc_screenbuf);
 937         vc->vc_screenbuf = newscreen;
 938         vc->vc_screenbuf_size = new_screen_size;
 939         set_origin(vc);
 940
 941         /* do part of a reset_terminal() */
 942         vc->vc_top = 0;
 943         vc->vc_bottom = vc->vc_rows;
 944         gotoxy(vc, vc->vc_x, vc->vc_y);
 945         save_cur(vc);
 946
 947         if (tty) {
 948                 /* Rewrite the requested winsize data with the actual
 949                    resulting sizes */
 950                 struct winsize ws;
 951                 memset(&ws, 0, sizeof(ws));
 952                 ws.ws_row = vc->vc_rows;
 953                 ws.ws_col = vc->vc_cols;
 954                 ws.ws_ypixel = vc->vc_scan_lines;
 955                 tty_do_resize(tty, &ws);
 956         }
 957
 958         if (CON_IS_VISIBLE(vc))
 959                 update_screen(vc);
 960         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 961         return err;
 962 }
 963
 964 /**
 965  *      vc_resize               -       resize a VT
 966  *      @vc: virtual console
 967  *      @cols: columns
 968  *      @rows: rows
 969  *
 970  *      Resize a virtual console as seen from the console end of things. We
 971  *      use the common vc_do_resize methods to update the structures. The
 972  *      caller must hold the console sem to protect console internals and
 973  *      vc->port.tty
 974  */
 975
 976 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 977 {
 978         return vc_do_resize(vc->port.tty, vc, cols, rows);
 979 }
 980
 981 /**
 982  *      vt_resize               -       resize a VT
 983  *      @tty: tty to resize
 984  *      @ws: winsize attributes
 985  *
 986  *      Resize a virtual terminal. This is called by the tty layer as we
 987  *      register our own handler for resizing. The mutual helper does all
 988  *      the actual work.
 989  *
 990  *      Takes the console sem and the called methods then take the tty
 991  *      termios_rwsem and the tty ctrl_lock in that order.
 992  */
 993 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 994 {
 995         struct vc_data *vc = tty->driver_data;
 996         int ret;
 997
 998         console_lock();
 999         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1000         console_unlock();
1001         return ret;
1002 }
1003
1004 struct vc_data *vc_deallocate(unsigned int currcons)
1005 {
1006         struct vc_data *vc = NULL;
1007
1008         WARN_CONSOLE_UNLOCKED();
1009
1010         if (vc_cons_allocated(currcons)) {
1011                 struct vt_notifier_param param;
1012
1013                 param.vc = vc = vc_cons[currcons].d;
1014                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1015                 vcs_remove_sysfs(currcons);
1016                 vc->vc_sw->con_deinit(vc);
1017                 put_pid(vc->vt_pid);
1018                 module_put(vc->vc_sw->owner);
1019                 kfree(vc->vc_screenbuf);
1020                 vc_cons[currcons].d = NULL;
1021         }
1022         return vc;
1023 }
1024
1025 /*
1026  *      VT102 emulator
1027  */
1028
1029 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1030 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1031 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1032
1033 #define decarm          VC_REPEAT
1034 #define decckm          VC_CKMODE
1035 #define kbdapplic       VC_APPLIC
1036 #define lnm             VC_CRLF
1037
1038 /*
1039  * this is what the terminal answers to a ESC-Z or csi0c query.
1040  */
1041 #define VT100ID "\033[?1;2c"
1042 #define VT102ID "\033[?6c"
1043
1044 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1045                                        8,12,10,14, 9,13,11,15 };
1046
1047 /* the default colour table, for VGA+ colour systems */
1048 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1049     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1050 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1051     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1052 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1053     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1054
1055 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1056 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1057 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1058
1059 /*
1060  * gotoxy() must verify all boundaries, because the arguments
1061  * might also be negative. If the given position is out of
1062  * bounds, the cursor is placed at the nearest margin.
1063  */
1064 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1065 {
1066         int min_y, max_y;
1067
1068         if (new_x < 0)
1069                 vc->vc_x = 0;
1070         else {
1071                 if (new_x >= vc->vc_cols)
1072                         vc->vc_x = vc->vc_cols - 1;
1073                 else
1074                         vc->vc_x = new_x;
1075         }
1076
1077         if (vc->vc_decom) {
1078                 min_y = vc->vc_top;
1079                 max_y = vc->vc_bottom;
1080         } else {
1081                 min_y = 0;
1082                 max_y = vc->vc_rows;
1083         }
1084         if (new_y < min_y)
1085                 vc->vc_y = min_y;
1086         else if (new_y >= max_y)
1087                 vc->vc_y = max_y - 1;
1088         else
1089                 vc->vc_y = new_y;
1090         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1091         vc->vc_need_wrap = 0;
1092 }
1093
1094 /* for absolute user moves, when decom is set */
1095 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1096 {
1097         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1098 }
1099
1100 void scrollback(struct vc_data *vc, int lines)
1101 {
1102         if (!lines)
1103                 lines = vc->vc_rows / 2;
1104         scrolldelta(-lines);
1105 }
1106
1107 void scrollfront(struct vc_data *vc, int lines)
1108 {
1109         if (!lines)
1110                 lines = vc->vc_rows / 2;
1111         scrolldelta(lines);
1112 }
1113
1114 static void lf(struct vc_data *vc)
1115 {
1116         /* don't scroll if above bottom of scrolling region, or
1117          * if below scrolling region
1118          */
1119         if (vc->vc_y + 1 == vc->vc_bottom)
1120                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1121         else if (vc->vc_y < vc->vc_rows - 1) {
1122                 vc->vc_y++;
1123                 vc->vc_pos += vc->vc_size_row;
1124         }
1125         vc->vc_need_wrap = 0;
1126         notify_write(vc, '\n');
1127 }
1128
1129 static void ri(struct vc_data *vc)
1130 {
1131         /* don't scroll if below top of scrolling region, or
1132          * if above scrolling region
1133          */
1134         if (vc->vc_y == vc->vc_top)
1135                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1136         else if (vc->vc_y > 0) {
1137                 vc->vc_y--;
1138                 vc->vc_pos -= vc->vc_size_row;
1139         }
1140         vc->vc_need_wrap = 0;
1141 }
1142
1143 static inline void cr(struct vc_data *vc)
1144 {
1145         vc->vc_pos -= vc->vc_x << 1;
1146         vc->vc_need_wrap = vc->vc_x = 0;
1147         notify_write(vc, '\r');
1148 }
1149
1150 static inline void bs(struct vc_data *vc)
1151 {
1152         if (vc->vc_x) {
1153                 vc->vc_pos -= 2;
1154                 vc->vc_x--;
1155                 vc->vc_need_wrap = 0;
1156                 notify_write(vc, '\b');
1157         }
1158 }
1159
1160 static inline void del(struct vc_data *vc)
1161 {
1162         /* ignored */
1163 }
1164
1165 static void csi_J(struct vc_data *vc, int vpar)
1166 {
1167         unsigned int count;
1168         unsigned short * start;
1169
1170         switch (vpar) {
1171                 case 0: /* erase from cursor to end of display */
1172                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1173                         start = (unsigned short *)vc->vc_pos;
1174                         break;
1175                 case 1: /* erase from start to cursor */
1176                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1177                         start = (unsigned short *)vc->vc_origin;
1178                         break;
1179                 case 3: /* erase scroll-back buffer (and whole display) */
1180                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1181                                     vc->vc_screenbuf_size);
1182                         set_origin(vc);
1183                         if (CON_IS_VISIBLE(vc))
1184                                 update_screen(vc);
1185                         /* fall through */
1186                 case 2: /* erase whole display */
1187                         count = vc->vc_cols * vc->vc_rows;
1188                         start = (unsigned short *)vc->vc_origin;
1189                         break;
1190                 default:
1191                         return;
1192         }
1193         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1194         if (DO_UPDATE(vc))
1195                 do_update_region(vc, (unsigned long) start, count);
1196         vc->vc_need_wrap = 0;
1197 }
1198
1199 static void csi_K(struct vc_data *vc, int vpar)
1200 {
1201         unsigned int count;
1202         unsigned short * start;
1203
1204         switch (vpar) {
1205                 case 0: /* erase from cursor to end of line */
1206                         count = vc->vc_cols - vc->vc_x;
1207                         start = (unsigned short *)vc->vc_pos;
1208                         break;
1209                 case 1: /* erase from start of line to cursor */
1210                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1211                         count = vc->vc_x + 1;
1212                         break;
1213                 case 2: /* erase whole line */
1214                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1215                         count = vc->vc_cols;
1216                         break;
1217                 default:
1218                         return;
1219         }
1220         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1221         vc->vc_need_wrap = 0;
1222         if (DO_UPDATE(vc))
1223                 do_update_region(vc, (unsigned long) start, count);
1224 }
1225
1226 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1227 {                                         /* not vt100? */
1228         int count;
1229
1230         if (!vpar)
1231                 vpar++;
1232         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1233
1234         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1235         if (DO_UPDATE(vc))
1236                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1237         vc->vc_need_wrap = 0;
1238 }
1239
1240 static void default_attr(struct vc_data *vc)
1241 {
1242         vc->vc_intensity = 1;
1243         vc->vc_italic = 0;
1244         vc->vc_underline = 0;
1245         vc->vc_reverse = 0;
1246         vc->vc_blink = 0;
1247         vc->vc_color = vc->vc_def_color;
1248 }
1249
1250 struct rgb { u8 r; u8 g; u8 b; };
1251
1252 static struct rgb rgb_from_256(int i)
1253 {
1254         struct rgb c;
1255         if (i < 8) {            /* Standard colours. */
1256                 c.r = i&1 ? 0xaa : 0x00;
1257                 c.g = i&2 ? 0xaa : 0x00;
1258                 c.b = i&4 ? 0xaa : 0x00;
1259         } else if (i < 16) {
1260                 c.r = i&1 ? 0xff : 0x55;
1261                 c.g = i&2 ? 0xff : 0x55;
1262                 c.b = i&4 ? 0xff : 0x55;
1263         } else if (i < 232) {   /* 6x6x6 colour cube. */
1264                 c.r = (i - 16) / 36 * 85 / 2;
1265                 c.g = (i - 16) / 6 % 6 * 85 / 2;
1266                 c.b = (i - 16) % 6 * 85 / 2;
1267         } else                  /* Grayscale ramp. */
1268                 c.r = c.g = c.b = i * 10 - 2312;
1269         return c;
1270 }
1271
1272 static void rgb_foreground(struct vc_data *vc, struct rgb c)
1273 {
1274         u8 hue, max = c.r;
1275         if (c.g > max)
1276                 max = c.g;
1277         if (c.b > max)
1278                 max = c.b;
1279         hue = (c.r > max/2 ? 4 : 0)
1280             | (c.g > max/2 ? 2 : 0)
1281             | (c.b > max/2 ? 1 : 0);
1282         if (hue == 7 && max <= 0x55)
1283                 hue = 0, vc->vc_intensity = 2;
1284         else
1285                 vc->vc_intensity = (max > 0xaa) + 1;
1286         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1287 }
1288
1289 static void rgb_background(struct vc_data *vc, struct rgb c)
1290 {
1291         /* For backgrounds, err on the dark side. */
1292         vc->vc_color = (vc->vc_color & 0x0f)
1293                 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1294 }
1295
1296 /* console_lock is held */
1297 static void csi_m(struct vc_data *vc)
1298 {
1299         int i;
1300
1301         for (i = 0; i <= vc->vc_npar; i++)
1302                 switch (vc->vc_par[i]) {
1303                         case 0: /* all attributes off */
1304                                 default_attr(vc);
1305                                 break;
1306                         case 1:
1307                                 vc->vc_intensity = 2;
1308                                 break;
1309                         case 2:
1310                                 vc->vc_intensity = 0;
1311                                 break;
1312                         case 3:
1313                                 vc->vc_italic = 1;
1314                                 break;
1315                         case 4:
1316                                 vc->vc_underline = 1;
1317                                 break;
1318                         case 5:
1319                                 vc->vc_blink = 1;
1320                                 break;
1321                         case 7:
1322                                 vc->vc_reverse = 1;
1323                                 break;
1324                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1325                                   * Select primary font, don't display
1326                                   * control chars if defined, don't set
1327                                   * bit 8 on output.
1328                                   */
1329                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1330                                                 ? vc->vc_G0_charset
1331                                                 : vc->vc_G1_charset, vc);
1332                                 vc->vc_disp_ctrl = 0;
1333                                 vc->vc_toggle_meta = 0;
1334                                 break;
1335                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1336                                   * Select first alternate font, lets
1337                                   * chars < 32 be displayed as ROM chars.
1338                                   */
1339                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1340                                 vc->vc_disp_ctrl = 1;
1341                                 vc->vc_toggle_meta = 0;
1342                                 break;
1343                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1344                                   * Select second alternate font, toggle
1345                                   * high bit before displaying as ROM char.
1346                                   */
1347                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1348                                 vc->vc_disp_ctrl = 1;
1349                                 vc->vc_toggle_meta = 1;
1350                                 break;
1351                         case 21:
1352                         case 22:
1353                                 vc->vc_intensity = 1;
1354                                 break;
1355                         case 23:
1356                                 vc->vc_italic = 0;
1357                                 break;
1358                         case 24:
1359                                 vc->vc_underline = 0;
1360                                 break;
1361                         case 25:
1362                                 vc->vc_blink = 0;
1363                                 break;
1364                         case 27:
1365                                 vc->vc_reverse = 0;
1366                                 break;
1367                         case 38: /* ITU T.416
1368                                   * Higher colour modes.
1369                                   * They break the usual properties of SGR codes
1370                                   * and thus need to be detected and ignored by
1371                                   * hand.  Strictly speaking, that standard also
1372                                   * wants : rather than ; as separators, contrary
1373                                   * to ECMA-48, but no one produces such codes
1374                                   * and almost no one accepts them.
1375                                   */
1376                                 i++;
1377                                 if (i > vc->vc_npar)
1378                                         break;
1379                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1380                                     i < vc->vc_npar) {     /* ubiquitous */
1381                                         i++;
1382                                         rgb_foreground(vc,
1383                                                 rgb_from_256(vc->vc_par[i]));
1384                                 } else if (vc->vc_par[i] == 2 &&  /* 24 bit */
1385                                            i <= vc->vc_npar + 3) {/* extremely rare */
1386                                         struct rgb c = {
1387                                                 .r = vc->vc_par[i + 1],
1388                                                 .g = vc->vc_par[i + 2],
1389                                                 .b = vc->vc_par[i + 3],
1390                                         };
1391                                         rgb_foreground(vc, c);
1392                                         i += 3;
1393                                 }
1394                                 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1395                                  * there's no point in supporting them.
1396                                  */
1397                                 break;
1398                         case 48:
1399                                 i++;
1400                                 if (i > vc->vc_npar)
1401                                         break;
1402                                 if (vc->vc_par[i] == 5 &&  /* 256 colours */
1403                                     i < vc->vc_npar) {
1404                                         i++;
1405                                         rgb_background(vc,
1406                                                 rgb_from_256(vc->vc_par[i]));
1407                                 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1408                                            i <= vc->vc_npar + 3) {
1409                                         struct rgb c = {
1410                                                 .r = vc->vc_par[i + 1],
1411                                                 .g = vc->vc_par[i + 2],
1412                                                 .b = vc->vc_par[i + 3],
1413                                         };
1414                                         rgb_background(vc, c);
1415                                         i += 3;
1416                                 }
1417                                 break;
1418                         case 39:
1419                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1420                                 break;
1421                         case 49:
1422                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1423                                 break;
1424                         default:
1425                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1426                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1427                                                 | (vc->vc_color & 0xf0);
1428                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1429                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1430                                                 | (vc->vc_color & 0x0f);
1431                                 break;
1432                 }
1433         update_attr(vc);
1434 }
1435
1436 static void respond_string(const char *p, struct tty_port *port)
1437 {
1438         while (*p) {
1439                 tty_insert_flip_char(port, *p, 0);
1440                 p++;
1441         }
1442         tty_schedule_flip(port);
1443 }
1444
1445 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1446 {
1447         char buf[40];
1448
1449         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1450         respond_string(buf, tty->port);
1451 }
1452
1453 static inline void status_report(struct tty_struct *tty)
1454 {
1455         respond_string("\033[0n", tty->port);   /* Terminal ok */
1456 }
1457
1458 static inline void respond_ID(struct tty_struct *tty)
1459 {
1460         respond_string(VT102ID, tty->port);
1461 }
1462
1463 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1464 {
1465         char buf[8];
1466
1467         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1468                 (char)('!' + mry));
1469         respond_string(buf, tty->port);
1470 }
1471
1472 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1473 int mouse_reporting(void)
1474 {
1475         return vc_cons[fg_console].d->vc_report_mouse;
1476 }
1477
1478 /* console_lock is held */
1479 static void set_mode(struct vc_data *vc, int on_off)
1480 {
1481         int i;
1482
1483         for (i = 0; i <= vc->vc_npar; i++)
1484                 if (vc->vc_ques) {
1485                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1486                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1487                                 if (on_off)
1488                                         set_kbd(vc, decckm);
1489                                 else
1490                                         clr_kbd(vc, decckm);
1491                                 break;
1492                         case 3: /* 80/132 mode switch unimplemented */
1493                                 vc->vc_deccolm = on_off;
1494 #if 0
1495                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1496                                 /* this alone does not suffice; some user mode
1497                                    utility has to change the hardware regs */
1498 #endif
1499                                 break;
1500                         case 5:                 /* Inverted screen on/off */
1501                                 if (vc->vc_decscnm != on_off) {
1502                                         vc->vc_decscnm = on_off;
1503                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1504                                         update_attr(vc);
1505                                 }
1506                                 break;
1507                         case 6:                 /* Origin relative/absolute */
1508                                 vc->vc_decom = on_off;
1509                                 gotoxay(vc, 0, 0);
1510                                 break;
1511                         case 7:                 /* Autowrap on/off */
1512                                 vc->vc_decawm = on_off;
1513                                 break;
1514                         case 8:                 /* Autorepeat on/off */
1515                                 if (on_off)
1516                                         set_kbd(vc, decarm);
1517                                 else
1518                                         clr_kbd(vc, decarm);
1519                                 break;
1520                         case 9:
1521                                 vc->vc_report_mouse = on_off ? 1 : 0;
1522                                 break;
1523                         case 25:                /* Cursor on/off */
1524                                 vc->vc_deccm = on_off;
1525                                 break;
1526                         case 1000:
1527                                 vc->vc_report_mouse = on_off ? 2 : 0;
1528                                 break;
1529                         }
1530                 } else {
1531                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1532                         case 3:                 /* Monitor (display ctrls) */
1533                                 vc->vc_disp_ctrl = on_off;
1534                                 break;
1535                         case 4:                 /* Insert Mode on/off */
1536                                 vc->vc_decim = on_off;
1537                                 break;
1538                         case 20:                /* Lf, Enter == CrLf/Lf */
1539                                 if (on_off)
1540                                         set_kbd(vc, lnm);
1541                                 else
1542                                         clr_kbd(vc, lnm);
1543                                 break;
1544                         }
1545                 }
1546 }
1547
1548 /* console_lock is held */
1549 static void setterm_command(struct vc_data *vc)
1550 {
1551         switch(vc->vc_par[0]) {
1552                 case 1: /* set color for underline mode */
1553                         if (vc->vc_can_do_color &&
1554                                         vc->vc_par[1] < 16) {
1555                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1556                                 if (vc->vc_underline)
1557                                         update_attr(vc);
1558                         }
1559                         break;
1560                 case 2: /* set color for half intensity mode */
1561                         if (vc->vc_can_do_color &&
1562                                         vc->vc_par[1] < 16) {
1563                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1564                                 if (vc->vc_intensity == 0)
1565                                         update_attr(vc);
1566                         }
1567                         break;
1568                 case 8: /* store colors as defaults */
1569                         vc->vc_def_color = vc->vc_attr;
1570                         if (vc->vc_hi_font_mask == 0x100)
1571                                 vc->vc_def_color >>= 1;
1572                         default_attr(vc);
1573                         update_attr(vc);
1574                         break;
1575                 case 9: /* set blanking interval */
1576                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1577                         poke_blanked_console();
1578                         break;
1579                 case 10: /* set bell frequency in Hz */
1580                         if (vc->vc_npar >= 1)
1581                                 vc->vc_bell_pitch = vc->vc_par[1];
1582                         else
1583                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1584                         break;
1585                 case 11: /* set bell duration in msec */
1586                         if (vc->vc_npar >= 1)
1587                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1588                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1589                         else
1590                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1591                         break;
1592                 case 12: /* bring specified console to the front */
1593                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1594                                 set_console(vc->vc_par[1] - 1);
1595                         break;
1596                 case 13: /* unblank the screen */
1597                         poke_blanked_console();
1598                         break;
1599                 case 14: /* set vesa powerdown interval */
1600                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1601                         break;
1602                 case 15: /* activate the previous console */
1603                         set_console(last_console);
1604                         break;
1605                 case 16: /* set cursor blink duration in msec */
1606                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1607                                         vc->vc_par[1] <= USHRT_MAX)
1608                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1609                         else
1610                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1611                         break;
1612         }
1613 }
1614
1615 /* console_lock is held */
1616 static void csi_at(struct vc_data *vc, unsigned int nr)
1617 {
1618         if (nr > vc->vc_cols - vc->vc_x)
1619                 nr = vc->vc_cols - vc->vc_x;
1620         else if (!nr)
1621                 nr = 1;
1622         insert_char(vc, nr);
1623 }
1624
1625 /* console_lock is held */
1626 static void csi_L(struct vc_data *vc, unsigned int nr)
1627 {
1628         if (nr > vc->vc_rows - vc->vc_y)
1629                 nr = vc->vc_rows - vc->vc_y;
1630         else if (!nr)
1631                 nr = 1;
1632         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1633         vc->vc_need_wrap = 0;
1634 }
1635
1636 /* console_lock is held */
1637 static void csi_P(struct vc_data *vc, unsigned int nr)
1638 {
1639         if (nr > vc->vc_cols - vc->vc_x)
1640                 nr = vc->vc_cols - vc->vc_x;
1641         else if (!nr)
1642                 nr = 1;
1643         delete_char(vc, nr);
1644 }
1645
1646 /* console_lock is held */
1647 static void csi_M(struct vc_data *vc, unsigned int nr)
1648 {
1649         if (nr > vc->vc_rows - vc->vc_y)
1650                 nr = vc->vc_rows - vc->vc_y;
1651         else if (!nr)
1652                 nr=1;
1653         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1654         vc->vc_need_wrap = 0;
1655 }
1656
1657 /* console_lock is held (except via vc_init->reset_terminal */
1658 static void save_cur(struct vc_data *vc)
1659 {
1660         vc->vc_saved_x          = vc->vc_x;
1661         vc->vc_saved_y          = vc->vc_y;
1662         vc->vc_s_intensity      = vc->vc_intensity;
1663         vc->vc_s_italic         = vc->vc_italic;
1664         vc->vc_s_underline      = vc->vc_underline;
1665         vc->vc_s_blink          = vc->vc_blink;
1666         vc->vc_s_reverse        = vc->vc_reverse;
1667         vc->vc_s_charset        = vc->vc_charset;
1668         vc->vc_s_color          = vc->vc_color;
1669         vc->vc_saved_G0         = vc->vc_G0_charset;
1670         vc->vc_saved_G1         = vc->vc_G1_charset;
1671 }
1672
1673 /* console_lock is held */
1674 static void restore_cur(struct vc_data *vc)
1675 {
1676         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1677         vc->vc_intensity        = vc->vc_s_intensity;
1678         vc->vc_italic           = vc->vc_s_italic;
1679         vc->vc_underline        = vc->vc_s_underline;
1680         vc->vc_blink            = vc->vc_s_blink;
1681         vc->vc_reverse          = vc->vc_s_reverse;
1682         vc->vc_charset          = vc->vc_s_charset;
1683         vc->vc_color            = vc->vc_s_color;
1684         vc->vc_G0_charset       = vc->vc_saved_G0;
1685         vc->vc_G1_charset       = vc->vc_saved_G1;
1686         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1687         update_attr(vc);
1688         vc->vc_need_wrap = 0;
1689 }
1690
1691 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1692         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1693         ESpalette, ESosc };
1694
1695 /* console_lock is held (except via vc_init()) */
1696 static void reset_terminal(struct vc_data *vc, int do_clear)
1697 {
1698         vc->vc_top              = 0;
1699         vc->vc_bottom           = vc->vc_rows;
1700         vc->vc_state            = ESnormal;
1701         vc->vc_ques             = 0;
1702         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1703         vc->vc_G0_charset       = LAT1_MAP;
1704         vc->vc_G1_charset       = GRAF_MAP;
1705         vc->vc_charset          = 0;
1706         vc->vc_need_wrap        = 0;
1707         vc->vc_report_mouse     = 0;
1708         vc->vc_utf              = default_utf8;
1709         vc->vc_utf_count        = 0;
1710
1711         vc->vc_disp_ctrl        = 0;
1712         vc->vc_toggle_meta      = 0;
1713
1714         vc->vc_decscnm          = 0;
1715         vc->vc_decom            = 0;
1716         vc->vc_decawm           = 1;
1717         vc->vc_deccm            = global_cursor_default;
1718         vc->vc_decim            = 0;
1719
1720         vt_reset_keyboard(vc->vc_num);
1721
1722         vc->vc_cursor_type = cur_default;
1723         vc->vc_complement_mask = vc->vc_s_complement_mask;
1724
1725         default_attr(vc);
1726         update_attr(vc);
1727
1728         vc->vc_tab_stop[0]      = 0x01010100;
1729         vc->vc_tab_stop[1]      =
1730         vc->vc_tab_stop[2]      =
1731         vc->vc_tab_stop[3]      =
1732         vc->vc_tab_stop[4]      =
1733         vc->vc_tab_stop[5]      =
1734         vc->vc_tab_stop[6]      =
1735         vc->vc_tab_stop[7]      = 0x01010101;
1736
1737         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1738         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1739         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1740
1741         gotoxy(vc, 0, 0);
1742         save_cur(vc);
1743         if (do_clear)
1744             csi_J(vc, 2);
1745 }
1746
1747 /* console_lock is held */
1748 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1749 {
1750         /*
1751          *  Control characters can be used in the _middle_
1752          *  of an escape sequence.
1753          */
1754         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1755                 return;
1756         switch (c) {
1757         case 0:
1758                 return;
1759         case 7:
1760                 if (vc->vc_state == ESosc)
1761                         vc->vc_state = ESnormal;
1762                 else if (vc->vc_bell_duration)
1763                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1764                 return;
1765         case 8:
1766                 bs(vc);
1767                 return;
1768         case 9:
1769                 vc->vc_pos -= (vc->vc_x << 1);
1770                 while (vc->vc_x < vc->vc_cols - 1) {
1771                         vc->vc_x++;
1772                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1773                                 break;
1774                 }
1775                 vc->vc_pos += (vc->vc_x << 1);
1776                 notify_write(vc, '\t');
1777                 return;
1778         case 10: case 11: case 12:
1779                 lf(vc);
1780                 if (!is_kbd(vc, lnm))
1781                         return;
1782         case 13:
1783                 cr(vc);
1784                 return;
1785         case 14:
1786                 vc->vc_charset = 1;
1787                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1788                 vc->vc_disp_ctrl = 1;
1789                 return;
1790         case 15:
1791                 vc->vc_charset = 0;
1792                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1793                 vc->vc_disp_ctrl = 0;
1794                 return;
1795         case 24: case 26:
1796                 vc->vc_state = ESnormal;
1797                 return;
1798         case 27:
1799                 vc->vc_state = ESesc;
1800                 return;
1801         case 127:
1802                 del(vc);
1803                 return;
1804         case 128+27:
1805                 vc->vc_state = ESsquare;
1806                 return;
1807         }
1808         switch(vc->vc_state) {
1809         case ESesc:
1810                 vc->vc_state = ESnormal;
1811                 switch (c) {
1812                 case '[':
1813                         vc->vc_state = ESsquare;
1814                         return;
1815                 case ']':
1816                         vc->vc_state = ESnonstd;
1817                         return;
1818                 case '%':
1819                         vc->vc_state = ESpercent;
1820                         return;
1821                 case 'E':
1822                         cr(vc);
1823                         lf(vc);
1824                         return;
1825                 case 'M':
1826                         ri(vc);
1827                         return;
1828                 case 'D':
1829                         lf(vc);
1830                         return;
1831                 case 'H':
1832                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1833                         return;
1834                 case 'Z':
1835                         respond_ID(tty);
1836                         return;
1837                 case '7':
1838                         save_cur(vc);
1839                         return;
1840                 case '8':
1841                         restore_cur(vc);
1842                         return;
1843                 case '(':
1844                         vc->vc_state = ESsetG0;
1845                         return;
1846                 case ')':
1847                         vc->vc_state = ESsetG1;
1848                         return;
1849                 case '#':
1850                         vc->vc_state = EShash;
1851                         return;
1852                 case 'c':
1853                         reset_terminal(vc, 1);
1854                         return;
1855                 case '>':  /* Numeric keypad */
1856                         clr_kbd(vc, kbdapplic);
1857                         return;
1858                 case '=':  /* Appl. keypad */
1859                         set_kbd(vc, kbdapplic);
1860                         return;
1861                 }
1862                 return;
1863         case ESnonstd:
1864                 if (c=='P') {   /* palette escape sequence */
1865                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1866                                 vc->vc_par[vc->vc_npar] = 0;
1867                         vc->vc_npar = 0;
1868                         vc->vc_state = ESpalette;
1869                         return;
1870                 } else if (c=='R') {   /* reset palette */
1871                         reset_palette(vc);
1872                         vc->vc_state = ESnormal;
1873                 } else if (c>='0' && c<='9')
1874                         vc->vc_state = ESosc;
1875                 else
1876                         vc->vc_state = ESnormal;
1877                 return;
1878         case ESpalette:
1879                 if (isxdigit(c)) {
1880                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1881                         if (vc->vc_npar == 7) {
1882                                 int i = vc->vc_par[0] * 3, j = 1;
1883                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1884                                 vc->vc_palette[i++] += vc->vc_par[j++];
1885                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1886                                 vc->vc_palette[i++] += vc->vc_par[j++];
1887                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1888                                 vc->vc_palette[i] += vc->vc_par[j];
1889                                 set_palette(vc);
1890                                 vc->vc_state = ESnormal;
1891                         }
1892                 } else
1893                         vc->vc_state = ESnormal;
1894                 return;
1895         case ESsquare:
1896                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1897                         vc->vc_par[vc->vc_npar] = 0;
1898                 vc->vc_npar = 0;
1899                 vc->vc_state = ESgetpars;
1900                 if (c == '[') { /* Function key */
1901                         vc->vc_state=ESfunckey;
1902                         return;
1903                 }
1904                 vc->vc_ques = (c == '?');
1905                 if (vc->vc_ques)
1906                         return;
1907         case ESgetpars:
1908                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1909                         vc->vc_npar++;
1910                         return;
1911                 } else if (c>='0' && c<='9') {
1912                         vc->vc_par[vc->vc_npar] *= 10;
1913                         vc->vc_par[vc->vc_npar] += c - '0';
1914                         return;
1915                 }
1916                 vc->vc_state = ESnormal;
1917                 switch(c) {
1918                 case 'h':
1919                         set_mode(vc, 1);
1920                         return;
1921                 case 'l':
1922                         set_mode(vc, 0);
1923                         return;
1924                 case 'c':
1925                         if (vc->vc_ques) {
1926                                 if (vc->vc_par[0])
1927                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1928                                 else
1929                                         vc->vc_cursor_type = cur_default;
1930                                 return;
1931                         }
1932                         break;
1933                 case 'm':
1934                         if (vc->vc_ques) {
1935                                 clear_selection();
1936                                 if (vc->vc_par[0])
1937                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1938                                 else
1939                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1940                                 return;
1941                         }
1942                         break;
1943                 case 'n':
1944                         if (!vc->vc_ques) {
1945                                 if (vc->vc_par[0] == 5)
1946                                         status_report(tty);
1947                                 else if (vc->vc_par[0] == 6)
1948                                         cursor_report(vc, tty);
1949                         }
1950                         return;
1951                 }
1952                 if (vc->vc_ques) {
1953                         vc->vc_ques = 0;
1954                         return;
1955                 }
1956                 switch(c) {
1957                 case 'G': case '`':
1958                         if (vc->vc_par[0])
1959                                 vc->vc_par[0]--;
1960                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1961                         return;
1962                 case 'A':
1963                         if (!vc->vc_par[0])
1964                                 vc->vc_par[0]++;
1965                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1966                         return;
1967                 case 'B': case 'e':
1968                         if (!vc->vc_par[0])
1969                                 vc->vc_par[0]++;
1970                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1971                         return;
1972                 case 'C': case 'a':
1973                         if (!vc->vc_par[0])
1974                                 vc->vc_par[0]++;
1975                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1976                         return;
1977                 case 'D':
1978                         if (!vc->vc_par[0])
1979                                 vc->vc_par[0]++;
1980                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1981                         return;
1982                 case 'E':
1983                         if (!vc->vc_par[0])
1984                                 vc->vc_par[0]++;
1985                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1986                         return;
1987                 case 'F':
1988                         if (!vc->vc_par[0])
1989                                 vc->vc_par[0]++;
1990                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1991                         return;
1992                 case 'd':
1993                         if (vc->vc_par[0])
1994                                 vc->vc_par[0]--;
1995                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1996                         return;
1997                 case 'H': case 'f':
1998                         if (vc->vc_par[0])
1999                                 vc->vc_par[0]--;
2000                         if (vc->vc_par[1])
2001                                 vc->vc_par[1]--;
2002                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2003                         return;
2004                 case 'J':
2005                         csi_J(vc, vc->vc_par[0]);
2006                         return;
2007                 case 'K':
2008                         csi_K(vc, vc->vc_par[0]);
2009                         return;
2010                 case 'L':
2011                         csi_L(vc, vc->vc_par[0]);
2012                         return;
2013                 case 'M':
2014                         csi_M(vc, vc->vc_par[0]);
2015                         return;
2016                 case 'P':
2017                         csi_P(vc, vc->vc_par[0]);
2018                         return;
2019                 case 'c':
2020                         if (!vc->vc_par[0])
2021                                 respond_ID(tty);
2022                         return;
2023                 case 'g':
2024                         if (!vc->vc_par[0])
2025                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2026                         else if (vc->vc_par[0] == 3) {
2027                                 vc->vc_tab_stop[0] =
2028                                         vc->vc_tab_stop[1] =
2029                                         vc->vc_tab_stop[2] =
2030                                         vc->vc_tab_stop[3] =
2031                                         vc->vc_tab_stop[4] =
2032                                         vc->vc_tab_stop[5] =
2033                                         vc->vc_tab_stop[6] =
2034                                         vc->vc_tab_stop[7] = 0;
2035                         }
2036                         return;
2037                 case 'm':
2038                         csi_m(vc);
2039                         return;
2040                 case 'q': /* DECLL - but only 3 leds */
2041                         /* map 0,1,2,3 to 0,1,2,4 */
2042                         if (vc->vc_par[0] < 4)
2043                                 vt_set_led_state(vc->vc_num,
2044                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2045                         return;
2046                 case 'r':
2047                         if (!vc->vc_par[0])
2048                                 vc->vc_par[0]++;
2049                         if (!vc->vc_par[1])
2050                                 vc->vc_par[1] = vc->vc_rows;
2051                         /* Minimum allowed region is 2 lines */
2052                         if (vc->vc_par[0] < vc->vc_par[1] &&
2053                             vc->vc_par[1] <= vc->vc_rows) {
2054                                 vc->vc_top = vc->vc_par[0] - 1;
2055                                 vc->vc_bottom = vc->vc_par[1];
2056                                 gotoxay(vc, 0, 0);
2057                         }
2058                         return;
2059                 case 's':
2060                         save_cur(vc);
2061                         return;
2062                 case 'u':
2063                         restore_cur(vc);
2064                         return;
2065                 case 'X':
2066                         csi_X(vc, vc->vc_par[0]);
2067                         return;
2068                 case '@':
2069                         csi_at(vc, vc->vc_par[0]);
2070                         return;
2071                 case ']': /* setterm functions */
2072                         setterm_command(vc);
2073                         return;
2074                 }
2075                 return;
2076         case ESpercent:
2077                 vc->vc_state = ESnormal;
2078                 switch (c) {
2079                 case '@':  /* defined in ISO 2022 */
2080                         vc->vc_utf = 0;
2081                         return;
2082                 case 'G':  /* prelim official escape code */
2083                 case '8':  /* retained for compatibility */
2084                         vc->vc_utf = 1;
2085                         return;
2086                 }
2087                 return;
2088         case ESfunckey:
2089                 vc->vc_state = ESnormal;
2090                 return;
2091         case EShash:
2092                 vc->vc_state = ESnormal;
2093                 if (c == '8') {
2094                         /* DEC screen alignment test. kludge :-) */
2095                         vc->vc_video_erase_char =
2096                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2097                         csi_J(vc, 2);
2098                         vc->vc_video_erase_char =
2099                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2100                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2101                 }
2102                 return;
2103         case ESsetG0:
2104                 if (c == '0')
2105                         vc->vc_G0_charset = GRAF_MAP;
2106                 else if (c == 'B')
2107                         vc->vc_G0_charset = LAT1_MAP;
2108                 else if (c == 'U')
2109                         vc->vc_G0_charset = IBMPC_MAP;
2110                 else if (c == 'K')
2111                         vc->vc_G0_charset = USER_MAP;
2112                 if (vc->vc_charset == 0)
2113                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2114                 vc->vc_state = ESnormal;
2115                 return;
2116         case ESsetG1:
2117                 if (c == '0')
2118                         vc->vc_G1_charset = GRAF_MAP;
2119                 else if (c == 'B')
2120                         vc->vc_G1_charset = LAT1_MAP;
2121                 else if (c == 'U')
2122                         vc->vc_G1_charset = IBMPC_MAP;
2123                 else if (c == 'K')
2124                         vc->vc_G1_charset = USER_MAP;
2125                 if (vc->vc_charset == 1)
2126                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2127                 vc->vc_state = ESnormal;
2128                 return;
2129         case ESosc:
2130                 return;
2131         default:
2132                 vc->vc_state = ESnormal;
2133         }
2134 }
2135
2136 /* is_double_width() is based on the wcwidth() implementation by
2137  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2138  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2139  */
2140 struct interval {
2141         uint32_t first;
2142         uint32_t last;
2143 };
2144
2145 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2146 {
2147         int min = 0;
2148         int mid;
2149
2150         if (ucs < table[0].first || ucs > table[max].last)
2151                 return 0;
2152         while (max >= min) {
2153                 mid = (min + max) / 2;
2154                 if (ucs > table[mid].last)
2155                         min = mid + 1;
2156                 else if (ucs < table[mid].first)
2157                         max = mid - 1;
2158                 else
2159                         return 1;
2160         }
2161         return 0;
2162 }
2163
2164 static int is_double_width(uint32_t ucs)
2165 {
2166         static const struct interval double_width[] = {
2167                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2168                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2169                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2170                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2171         };
2172         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2173 }
2174
2175 /* acquires console_lock */
2176 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2177 {
2178 #ifdef VT_BUF_VRAM_ONLY
2179 #define FLUSH do { } while(0);
2180 #else
2181 #define FLUSH if (draw_x >= 0) { \
2182         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2183         draw_x = -1; \
2184         }
2185 #endif
2186
2187         int c, tc, ok, n = 0, draw_x = -1;
2188         unsigned int currcons;
2189         unsigned long draw_from = 0, draw_to = 0;
2190         struct vc_data *vc;
2191         unsigned char vc_attr;
2192         struct vt_notifier_param param;
2193         uint8_t rescan;
2194         uint8_t inverse;
2195         uint8_t width;
2196         u16 himask, charmask;
2197
2198         if (in_interrupt())
2199                 return count;
2200
2201         might_sleep();
2202
2203         console_lock();
2204         vc = tty->driver_data;
2205         if (vc == NULL) {
2206                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2207                 console_unlock();
2208                 return 0;
2209         }
2210
2211         currcons = vc->vc_num;
2212         if (!vc_cons_allocated(currcons)) {
2213                 /* could this happen? */
2214                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2215                 console_unlock();
2216                 return 0;
2217         }
2218
2219         himask = vc->vc_hi_font_mask;
2220         charmask = himask ? 0x1ff : 0xff;
2221
2222         /* undraw cursor first */
2223         if (IS_FG(vc))
2224                 hide_cursor(vc);
2225
2226         param.vc = vc;
2227
2228         while (!tty->stopped && count) {
2229                 int orig = *buf;
2230                 c = orig;
2231                 buf++;
2232                 n++;
2233                 count--;
2234                 rescan = 0;
2235                 inverse = 0;
2236                 width = 1;
2237
2238                 /* Do no translation at all in control states */
2239                 if (vc->vc_state != ESnormal) {
2240                         tc = c;
2241                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2242                     /* Combine UTF-8 into Unicode in vc_utf_char.
2243                      * vc_utf_count is the number of continuation bytes still
2244                      * expected to arrive.
2245                      * vc_npar is the number of continuation bytes arrived so
2246                      * far
2247                      */
2248 rescan_last_byte:
2249                     if ((c & 0xc0) == 0x80) {
2250                         /* Continuation byte received */
2251                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2252                         if (vc->vc_utf_count) {
2253                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2254                             vc->vc_npar++;
2255                             if (--vc->vc_utf_count) {
2256                                 /* Still need some bytes */
2257                                 continue;
2258                             }
2259                             /* Got a whole character */
2260                             c = vc->vc_utf_char;
2261                             /* Reject overlong sequences */
2262                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2263                                         c > utf8_length_changes[vc->vc_npar])
2264                                 c = 0xfffd;
2265                         } else {
2266                             /* Unexpected continuation byte */
2267                             vc->vc_utf_count = 0;
2268                             c = 0xfffd;
2269                         }
2270                     } else {
2271                         /* Single ASCII byte or first byte of a sequence received */
2272                         if (vc->vc_utf_count) {
2273                             /* Continuation byte expected */
2274                             rescan = 1;
2275                             vc->vc_utf_count = 0;
2276                             c = 0xfffd;
2277                         } else if (c > 0x7f) {
2278                             /* First byte of a multibyte sequence received */
2279                             vc->vc_npar = 0;
2280                             if ((c & 0xe0) == 0xc0) {
2281                                 vc->vc_utf_count = 1;
2282                                 vc->vc_utf_char = (c & 0x1f);
2283                             } else if ((c & 0xf0) == 0xe0) {
2284                                 vc->vc_utf_count = 2;
2285                                 vc->vc_utf_char = (c & 0x0f);
2286                             } else if ((c & 0xf8) == 0xf0) {
2287                                 vc->vc_utf_count = 3;
2288                                 vc->vc_utf_char = (c & 0x07);
2289                             } else if ((c & 0xfc) == 0xf8) {
2290                                 vc->vc_utf_count = 4;
2291                                 vc->vc_utf_char = (c & 0x03);
2292                             } else if ((c & 0xfe) == 0xfc) {
2293                                 vc->vc_utf_count = 5;
2294                                 vc->vc_utf_char = (c & 0x01);
2295                             } else {
2296                                 /* 254 and 255 are invalid */
2297                                 c = 0xfffd;
2298                             }
2299                             if (vc->vc_utf_count) {
2300                                 /* Still need some bytes */
2301                                 continue;
2302                             }
2303                         }
2304                         /* Nothing to do if an ASCII byte was received */
2305                     }
2306                     /* End of UTF-8 decoding. */
2307                     /* c is the received character, or U+FFFD for invalid sequences. */
2308                     /* Replace invalid Unicode code points with U+FFFD too */
2309                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2310                         c = 0xfffd;
2311                     tc = c;
2312                 } else {        /* no utf or alternate charset mode */
2313                     tc = vc_translate(vc, c);
2314                 }
2315
2316                 param.c = tc;
2317                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2318                                         &param) == NOTIFY_STOP)
2319                         continue;
2320
2321                 /* If the original code was a control character we
2322                  * only allow a glyph to be displayed if the code is
2323                  * not normally used (such as for cursor movement) or
2324                  * if the disp_ctrl mode has been explicitly enabled.
2325                  * Certain characters (as given by the CTRL_ALWAYS
2326                  * bitmap) are always displayed as control characters,
2327                  * as the console would be pretty useless without
2328                  * them; to display an arbitrary font position use the
2329                  * direct-to-font zone in UTF-8 mode.
2330                  */
2331                 ok = tc && (c >= 32 ||
2332                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2333                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2334                         && (c != 127 || vc->vc_disp_ctrl)
2335                         && (c != 128+27);
2336
2337                 if (vc->vc_state == ESnormal && ok) {
2338                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2339                                 if (is_double_width(c))
2340                                         width = 2;
2341                         }
2342                         /* Now try to find out how to display it */
2343                         tc = conv_uni_to_pc(vc, tc);
2344                         if (tc & ~charmask) {
2345                                 if (tc == -1 || tc == -2) {
2346                                     continue; /* nothing to display */
2347                                 }
2348                                 /* Glyph not found */
2349                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2350                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2351                                        This would make absolutely no sense with Unicode in mind,
2352                                        but do this for ASCII characters since a font may lack
2353                                        Unicode mapping info and we don't want to end up with
2354                                        having question marks only. */
2355                                     tc = c;
2356                                 } else {
2357                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2358                                     tc = conv_uni_to_pc(vc, 0xfffd);
2359                                     if (tc < 0) {
2360                                         inverse = 1;
2361                                         tc = conv_uni_to_pc(vc, '?');
2362                                         if (tc < 0) tc = '?';
2363                                     }
2364                                 }
2365                         }
2366
2367                         if (!inverse) {
2368                                 vc_attr = vc->vc_attr;
2369                         } else {
2370                                 /* invert vc_attr */
2371                                 if (!vc->vc_can_do_color) {
2372                                         vc_attr = (vc->vc_attr) ^ 0x08;
2373                                 } else if (vc->vc_hi_font_mask == 0x100) {
2374                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2375                                 } else {
2376                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2377                                 }
2378                                 FLUSH
2379                         }
2380
2381                         while (1) {
2382                                 if (vc->vc_need_wrap || vc->vc_decim)
2383                                         FLUSH
2384                                 if (vc->vc_need_wrap) {
2385                                         cr(vc);
2386                                         lf(vc);
2387                                 }
2388                                 if (vc->vc_decim)
2389                                         insert_char(vc, 1);
2390                                 scr_writew(himask ?
2391                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2392                                              (vc_attr << 8) + tc,
2393                                            (u16 *) vc->vc_pos);
2394                                 if (DO_UPDATE(vc) && draw_x < 0) {
2395                                         draw_x = vc->vc_x;
2396                                         draw_from = vc->vc_pos;
2397                                 }
2398                                 if (vc->vc_x == vc->vc_cols - 1) {
2399                                         vc->vc_need_wrap = vc->vc_decawm;
2400                                         draw_to = vc->vc_pos + 2;
2401                                 } else {
2402                                         vc->vc_x++;
2403                                         draw_to = (vc->vc_pos += 2);
2404                                 }
2405
2406                                 if (!--width) break;
2407
2408                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2409                                 if (tc < 0) tc = ' ';
2410                         }
2411                         notify_write(vc, c);
2412
2413                         if (inverse) {
2414                                 FLUSH
2415                         }
2416
2417                         if (rescan) {
2418                                 rescan = 0;
2419                                 inverse = 0;
2420                                 width = 1;
2421                                 c = orig;
2422                                 goto rescan_last_byte;
2423                         }
2424                         continue;
2425                 }
2426                 FLUSH
2427                 do_con_trol(tty, vc, orig);
2428         }
2429         FLUSH
2430         console_conditional_schedule();
2431         console_unlock();
2432         notify_update(vc);
2433         return n;
2434 #undef FLUSH
2435 }
2436
2437 /*
2438  * This is the console switching callback.
2439  *
2440  * Doing console switching in a process context allows
2441  * us to do the switches asynchronously (needed when we want
2442  * to switch due to a keyboard interrupt).  Synchronization
2443  * with other console code and prevention of re-entrancy is
2444  * ensured with console_lock.
2445  */
2446 static void console_callback(struct work_struct *ignored)
2447 {
2448         console_lock();
2449
2450         if (want_console >= 0) {
2451                 if (want_console != fg_console &&
2452                     vc_cons_allocated(want_console)) {
2453                         hide_cursor(vc_cons[fg_console].d);
2454                         change_console(vc_cons[want_console].d);
2455                         /* we only changed when the console had already
2456                            been allocated - a new console is not created
2457                            in an interrupt routine */
2458                 }
2459                 want_console = -1;
2460         }
2461         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2462                 do_poke_blanked_console = 0;
2463                 poke_blanked_console();
2464         }
2465         if (scrollback_delta) {
2466                 struct vc_data *vc = vc_cons[fg_console].d;
2467                 clear_selection();
2468                 if (vc->vc_mode == KD_TEXT)
2469                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2470                 scrollback_delta = 0;
2471         }
2472         if (blank_timer_expired) {
2473                 do_blank_screen(0);
2474                 blank_timer_expired = 0;
2475         }
2476         notify_update(vc_cons[fg_console].d);
2477
2478         console_unlock();
2479 }
2480
2481 int set_console(int nr)
2482 {
2483         struct vc_data *vc = vc_cons[fg_console].d;
2484
2485         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2486                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2487
2488                 /*
2489                  * Console switch will fail in console_callback() or
2490                  * change_console() so there is no point scheduling
2491                  * the callback
2492                  *
2493                  * Existing set_console() users don't check the return
2494                  * value so this shouldn't break anything
2495                  */
2496                 return -EINVAL;
2497         }
2498
2499         want_console = nr;
2500         schedule_console_callback();
2501
2502         return 0;
2503 }
2504
2505 struct tty_driver *console_driver;
2506
2507 #ifdef CONFIG_VT_CONSOLE
2508
2509 /**
2510  * vt_kmsg_redirect() - Sets/gets the kernel message console
2511  * @new:        The new virtual terminal number or -1 if the console should stay
2512  *              unchanged
2513  *
2514  * By default, the kernel messages are always printed on the current virtual
2515  * console. However, the user may modify that default with the
2516  * TIOCL_SETKMSGREDIRECT ioctl call.
2517  *
2518  * This function sets the kernel message console to be @new. It returns the old
2519  * virtual console number. The virtual terminal number 0 (both as parameter and
2520  * return value) means no redirection (i.e. always printed on the currently
2521  * active console).
2522  *
2523  * The parameter -1 means that only the current console is returned, but the
2524  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2525  * case to make the code more understandable.
2526  *
2527  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2528  * the parameter and always returns 0.
2529  */
2530 int vt_kmsg_redirect(int new)
2531 {
2532         static int kmsg_con;
2533
2534         if (new != -1)
2535                 return xchg(&kmsg_con, new);
2536         else
2537                 return kmsg_con;
2538 }
2539
2540 /*
2541  *      Console on virtual terminal
2542  *
2543  * The console must be locked when we get here.
2544  */
2545
2546 static void vt_console_print(struct console *co, const char *b, unsigned count)
2547 {
2548         struct vc_data *vc = vc_cons[fg_console].d;
2549         unsigned char c;
2550         static DEFINE_SPINLOCK(printing_lock);
2551         const ushort *start;
2552         ushort cnt = 0;
2553         ushort myx;
2554         int kmsg_console;
2555
2556         /* console busy or not yet initialized */
2557         if (!printable)
2558                 return;
2559         if (!spin_trylock(&printing_lock))
2560                 return;
2561
2562         kmsg_console = vt_get_kmsg_redirect();
2563         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2564                 vc = vc_cons[kmsg_console - 1].d;
2565
2566         /* read `x' only after setting currcons properly (otherwise
2567            the `x' macro will read the x of the foreground console). */
2568         myx = vc->vc_x;
2569
2570         if (!vc_cons_allocated(fg_console)) {
2571                 /* impossible */
2572                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2573                 goto quit;
2574         }
2575
2576         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2577                 goto quit;
2578
2579         /* undraw cursor first */
2580         if (IS_FG(vc))
2581                 hide_cursor(vc);
2582
2583         start = (ushort *)vc->vc_pos;
2584
2585         /* Contrived structure to try to emulate original need_wrap behaviour
2586          * Problems caused when we have need_wrap set on '\n' character */
2587         while (count--) {
2588                 c = *b++;
2589                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2590                         if (cnt > 0) {
2591                                 if (CON_IS_VISIBLE(vc))
2592                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2593                                 vc->vc_x += cnt;
2594                                 if (vc->vc_need_wrap)
2595                                         vc->vc_x--;
2596                                 cnt = 0;
2597                         }
2598                         if (c == 8) {           /* backspace */
2599                                 bs(vc);
2600                                 start = (ushort *)vc->vc_pos;
2601                                 myx = vc->vc_x;
2602                                 continue;
2603                         }
2604                         if (c != 13)
2605                                 lf(vc);
2606                         cr(vc);
2607                         start = (ushort *)vc->vc_pos;
2608                         myx = vc->vc_x;
2609                         if (c == 10 || c == 13)
2610                                 continue;
2611                 }
2612                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2613                 notify_write(vc, c);
2614                 cnt++;
2615                 if (myx == vc->vc_cols - 1) {
2616                         vc->vc_need_wrap = 1;
2617                         continue;
2618                 }
2619                 vc->vc_pos += 2;
2620                 myx++;
2621         }
2622         if (cnt > 0) {
2623                 if (CON_IS_VISIBLE(vc))
2624                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2625                 vc->vc_x += cnt;
2626                 if (vc->vc_x == vc->vc_cols) {
2627                         vc->vc_x--;
2628                         vc->vc_need_wrap = 1;
2629                 }
2630         }
2631         set_cursor(vc);
2632         notify_update(vc);
2633
2634 quit:
2635         spin_unlock(&printing_lock);
2636 }
2637
2638 static struct tty_driver *vt_console_device(struct console *c, int *index)
2639 {
2640         *index = c->index ? c->index-1 : fg_console;
2641         return console_driver;
2642 }
2643
2644 static struct console vt_console_driver = {
2645         .name           = "tty",
2646         .write          = vt_console_print,
2647         .device         = vt_console_device,
2648         .unblank        = unblank_screen,
2649         .flags          = CON_PRINTBUFFER,
2650         .index          = -1,
2651 };
2652 #endif
2653
2654 /*
2655  *      Handling of Linux-specific VC ioctls
2656  */
2657
2658 /*
2659  * Generally a bit racy with respect to console_lock();.
2660  *
2661  * There are some functions which don't need it.
2662  *
2663  * There are some functions which can sleep for arbitrary periods
2664  * (paste_selection) but we don't need the lock there anyway.
2665  *
2666  * set_selection has locking, and definitely needs it
2667  */
2668
2669 int tioclinux(struct tty_struct *tty, unsigned long arg)
2670 {
2671         char type, data;
2672         char __user *p = (char __user *)arg;
2673         int lines;
2674         int ret;
2675
2676         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2677                 return -EPERM;
2678         if (get_user(type, p))
2679                 return -EFAULT;
2680         ret = 0;
2681
2682         switch (type)
2683         {
2684                 case TIOCL_SETSEL:
2685                         console_lock();
2686                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2687                         console_unlock();
2688                         break;
2689                 case TIOCL_PASTESEL:
2690                         ret = paste_selection(tty);
2691                         break;
2692                 case TIOCL_UNBLANKSCREEN:
2693                         console_lock();
2694                         unblank_screen();
2695                         console_unlock();
2696                         break;
2697                 case TIOCL_SELLOADLUT:
2698                         console_lock();
2699                         ret = sel_loadlut(p);
2700                         console_unlock();
2701                         break;
2702                 case TIOCL_GETSHIFTSTATE:
2703
2704         /*
2705          * Make it possible to react to Shift+Mousebutton.
2706          * Note that 'shift_state' is an undocumented
2707          * kernel-internal variable; programs not closely
2708          * related to the kernel should not use this.
2709          */
2710                         data = vt_get_shift_state();
2711                         ret = __put_user(data, p);
2712                         break;
2713                 case TIOCL_GETMOUSEREPORTING:
2714                         console_lock(); /* May be overkill */
2715                         data = mouse_reporting();
2716                         console_unlock();
2717                         ret = __put_user(data, p);
2718                         break;
2719                 case TIOCL_SETVESABLANK:
2720                         console_lock();
2721                         ret = set_vesa_blanking(p);
2722                         console_unlock();
2723                         break;
2724                 case TIOCL_GETKMSGREDIRECT:
2725                         data = vt_get_kmsg_redirect();
2726                         ret = __put_user(data, p);
2727                         break;
2728                 case TIOCL_SETKMSGREDIRECT:
2729                         if (!capable(CAP_SYS_ADMIN)) {
2730                                 ret = -EPERM;
2731                         } else {
2732                                 if (get_user(data, p+1))
2733                                         ret = -EFAULT;
2734                                 else
2735                                         vt_kmsg_redirect(data);
2736                         }
2737                         break;
2738                 case TIOCL_GETFGCONSOLE:
2739                         /* No locking needed as this is a transiently
2740                            correct return anyway if the caller hasn't
2741                            disabled switching */
2742                         ret = fg_console;
2743                         break;
2744                 case TIOCL_SCROLLCONSOLE:
2745                         if (get_user(lines, (s32 __user *)(p+4))) {
2746                                 ret = -EFAULT;
2747                         } else {
2748                                 /* Need the console lock here. Note that lots
2749                                    of other calls need fixing before the lock
2750                                    is actually useful ! */
2751                                 console_lock();
2752                                 scrollfront(vc_cons[fg_console].d, lines);
2753                                 console_unlock();
2754                                 ret = 0;
2755                         }
2756                         break;
2757                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2758                         console_lock();
2759                         ignore_poke = 1;
2760                         do_blank_screen(0);
2761                         console_unlock();
2762                         break;
2763                 case TIOCL_BLANKEDSCREEN:
2764                         ret = console_blanked;
2765                         break;
2766                 default:
2767                         ret = -EINVAL;
2768                         break;
2769         }
2770         return ret;
2771 }
2772
2773 /*
2774  * /dev/ttyN handling
2775  */
2776
2777 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2778 {
2779         int     retval;
2780
2781         retval = do_con_write(tty, buf, count);
2782         con_flush_chars(tty);
2783
2784         return retval;
2785 }
2786
2787 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2788 {
2789         if (in_interrupt())
2790                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2791         return do_con_write(tty, &ch, 1);
2792 }
2793
2794 static int con_write_room(struct tty_struct *tty)
2795 {
2796         if (tty->stopped)
2797                 return 0;
2798         return 32768;           /* No limit, really; we're not buffering */
2799 }
2800
2801 static int con_chars_in_buffer(struct tty_struct *tty)
2802 {
2803         return 0;               /* we're not buffering */
2804 }
2805
2806 /*
2807  * con_throttle and con_unthrottle are only used for
2808  * paste_selection(), which has to stuff in a large number of
2809  * characters...
2810  */
2811 static void con_throttle(struct tty_struct *tty)
2812 {
2813 }
2814
2815 static void con_unthrottle(struct tty_struct *tty)
2816 {
2817         struct vc_data *vc = tty->driver_data;
2818
2819         wake_up_interruptible(&vc->paste_wait);
2820 }
2821
2822 /*
2823  * Turn the Scroll-Lock LED on when the tty is stopped
2824  */
2825 static void con_stop(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_stop(console_num);
2834 }
2835
2836 /*
2837  * Turn the Scroll-Lock LED off when the console is started
2838  */
2839 static void con_start(struct tty_struct *tty)
2840 {
2841         int console_num;
2842         if (!tty)
2843                 return;
2844         console_num = tty->index;
2845         if (!vc_cons_allocated(console_num))
2846                 return;
2847         vt_kbd_con_start(console_num);
2848 }
2849
2850 static void con_flush_chars(struct tty_struct *tty)
2851 {
2852         struct vc_data *vc;
2853
2854         if (in_interrupt())     /* from flush_to_ldisc */
2855                 return;
2856
2857         /* if we race with con_close(), vt may be null */
2858         console_lock();
2859         vc = tty->driver_data;
2860         if (vc)
2861                 set_cursor(vc);
2862         console_unlock();
2863 }
2864
2865 /*
2866  * Allocate the console screen memory.
2867  */
2868 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2869 {
2870         unsigned int currcons = tty->index;
2871         struct vc_data *vc;
2872         int ret;
2873
2874         console_lock();
2875         ret = vc_allocate(currcons);
2876         if (ret)
2877                 goto unlock;
2878
2879         vc = vc_cons[currcons].d;
2880
2881         /* Still being freed */
2882         if (vc->port.tty) {
2883                 ret = -ERESTARTSYS;
2884                 goto unlock;
2885         }
2886
2887         ret = tty_port_install(&vc->port, driver, tty);
2888         if (ret)
2889                 goto unlock;
2890
2891         tty->driver_data = vc;
2892         vc->port.tty = tty;
2893
2894         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2895                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2896                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2897         }
2898         if (vc->vc_utf)
2899                 tty->termios.c_iflag |= IUTF8;
2900         else
2901                 tty->termios.c_iflag &= ~IUTF8;
2902 unlock:
2903         console_unlock();
2904         return ret;
2905 }
2906
2907 static int con_open(struct tty_struct *tty, struct file *filp)
2908 {
2909         /* everything done in install */
2910         return 0;
2911 }
2912
2913
2914 static void con_close(struct tty_struct *tty, struct file *filp)
2915 {
2916         /* Nothing to do - we defer to shutdown */
2917 }
2918
2919 static void con_shutdown(struct tty_struct *tty)
2920 {
2921         struct vc_data *vc = tty->driver_data;
2922         BUG_ON(vc == NULL);
2923         console_lock();
2924         vc->port.tty = NULL;
2925         console_unlock();
2926 }
2927
2928 static int default_color           = 7; /* white */
2929 static int default_italic_color    = 2; // green (ASCII)
2930 static int default_underline_color = 3; // cyan (ASCII)
2931 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2932 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2933 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2934
2935 static void vc_init(struct vc_data *vc, unsigned int rows,
2936                     unsigned int cols, int do_clear)
2937 {
2938         int j, k ;
2939
2940         vc->vc_cols = cols;
2941         vc->vc_rows = rows;
2942         vc->vc_size_row = cols << 1;
2943         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2944
2945         set_origin(vc);
2946         vc->vc_pos = vc->vc_origin;
2947         reset_vc(vc);
2948         for (j=k=0; j<16; j++) {
2949                 vc->vc_palette[k++] = default_red[j] ;
2950                 vc->vc_palette[k++] = default_grn[j] ;
2951                 vc->vc_palette[k++] = default_blu[j] ;
2952         }
2953         vc->vc_def_color       = default_color;
2954         vc->vc_ulcolor         = default_underline_color;
2955         vc->vc_itcolor         = default_italic_color;
2956         vc->vc_halfcolor       = 0x08;   /* grey */
2957         init_waitqueue_head(&vc->paste_wait);
2958         reset_terminal(vc, do_clear);
2959 }
2960
2961 /*
2962  * This routine initializes console interrupts, and does nothing
2963  * else. If you want the screen to clear, call tty_write with
2964  * the appropriate escape-sequence.
2965  */
2966
2967 static int __init con_init(void)
2968 {
2969         const char *display_desc = NULL;
2970         struct vc_data *vc;
2971         unsigned int currcons = 0, i;
2972
2973         console_lock();
2974
2975         if (conswitchp)
2976                 display_desc = conswitchp->con_startup();
2977         if (!display_desc) {
2978                 fg_console = 0;
2979                 console_unlock();
2980                 return 0;
2981         }
2982
2983         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2984                 struct con_driver *con_driver = &registered_con_driver[i];
2985
2986                 if (con_driver->con == NULL) {
2987                         con_driver->con = conswitchp;
2988                         con_driver->desc = display_desc;
2989                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2990                         con_driver->first = 0;
2991                         con_driver->last = MAX_NR_CONSOLES - 1;
2992                         break;
2993                 }
2994         }
2995
2996         for (i = 0; i < MAX_NR_CONSOLES; i++)
2997                 con_driver_map[i] = conswitchp;
2998
2999         if (blankinterval) {
3000                 blank_state = blank_normal_wait;
3001                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3002         }
3003
3004         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3005                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3006                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3007                 tty_port_init(&vc->port);
3008                 visual_init(vc, currcons, 1);
3009                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3010                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3011                         currcons || !vc->vc_sw->con_save_screen);
3012         }
3013         currcons = fg_console = 0;
3014         master_display_fg = vc = vc_cons[currcons].d;
3015         set_origin(vc);
3016         save_screen(vc);
3017         gotoxy(vc, vc->vc_x, vc->vc_y);
3018         csi_J(vc, 0);
3019         update_screen(vc);
3020         pr_info("Console: %s %s %dx%d\n",
3021                 vc->vc_can_do_color ? "colour" : "mono",
3022                 display_desc, vc->vc_cols, vc->vc_rows);
3023         printable = 1;
3024
3025         console_unlock();
3026
3027 #ifdef CONFIG_VT_CONSOLE
3028         register_console(&vt_console_driver);
3029 #endif
3030         return 0;
3031 }
3032 console_initcall(con_init);
3033
3034 static const struct tty_operations con_ops = {
3035         .install = con_install,
3036         .open = con_open,
3037         .close = con_close,
3038         .write = con_write,
3039         .write_room = con_write_room,
3040         .put_char = con_put_char,
3041         .flush_chars = con_flush_chars,
3042         .chars_in_buffer = con_chars_in_buffer,
3043         .ioctl = vt_ioctl,
3044 #ifdef CONFIG_COMPAT
3045         .compat_ioctl = vt_compat_ioctl,
3046 #endif
3047         .stop = con_stop,
3048         .start = con_start,
3049         .throttle = con_throttle,
3050         .unthrottle = con_unthrottle,
3051         .resize = vt_resize,
3052         .shutdown = con_shutdown
3053 };
3054
3055 static struct cdev vc0_cdev;
3056
3057 static ssize_t show_tty_active(struct device *dev,
3058                                 struct device_attribute *attr, char *buf)
3059 {
3060         return sprintf(buf, "tty%d\n", fg_console + 1);
3061 }
3062 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3063
3064 static struct attribute *vt_dev_attrs[] = {
3065         &dev_attr_active.attr,
3066         NULL
3067 };
3068
3069 ATTRIBUTE_GROUPS(vt_dev);
3070
3071 int __init vty_init(const struct file_operations *console_fops)
3072 {
3073         cdev_init(&vc0_cdev, console_fops);
3074         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3075             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3076                 panic("Couldn't register /dev/tty0 driver\n");
3077         tty0dev = device_create_with_groups(tty_class, NULL,
3078                                             MKDEV(TTY_MAJOR, 0), NULL,
3079                                             vt_dev_groups, "tty0");
3080         if (IS_ERR(tty0dev))
3081                 tty0dev = NULL;
3082
3083         vcs_init();
3084
3085         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3086         if (!console_driver)
3087                 panic("Couldn't allocate console driver\n");
3088
3089         console_driver->name = "tty";
3090         console_driver->name_base = 1;
3091         console_driver->major = TTY_MAJOR;
3092         console_driver->minor_start = 1;
3093         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3094         console_driver->init_termios = tty_std_termios;
3095         if (default_utf8)
3096                 console_driver->init_termios.c_iflag |= IUTF8;
3097         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3098         tty_set_operations(console_driver, &con_ops);
3099         if (tty_register_driver(console_driver))
3100                 panic("Couldn't register console driver\n");
3101         kbd_init();
3102         console_map_init();
3103 #ifdef CONFIG_MDA_CONSOLE
3104         mda_console_init();
3105 #endif
3106         return 0;
3107 }
3108
3109 #ifndef VT_SINGLE_DRIVER
3110
3111 static struct class *vtconsole_class;
3112
3113 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3114                            int deflt)
3115 {
3116         struct module *owner = csw->owner;
3117         const char *desc = NULL;
3118         struct con_driver *con_driver;
3119         int i, j = -1, k = -1, retval = -ENODEV;
3120
3121         if (!try_module_get(owner))
3122                 return -ENODEV;
3123
3124         WARN_CONSOLE_UNLOCKED();
3125
3126         /* check if driver is registered */
3127         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3128                 con_driver = &registered_con_driver[i];
3129
3130                 if (con_driver->con == csw) {
3131                         desc = con_driver->desc;
3132                         retval = 0;
3133                         break;
3134                 }
3135         }
3136
3137         if (retval)
3138                 goto err;
3139
3140         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3141                 csw->con_startup();
3142                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3143         }
3144
3145         if (deflt) {
3146                 if (conswitchp)
3147                         module_put(conswitchp->owner);
3148
3149                 __module_get(owner);
3150                 conswitchp = csw;
3151         }
3152
3153         first = max(first, con_driver->first);
3154         last = min(last, con_driver->last);
3155
3156         for (i = first; i <= last; i++) {
3157                 int old_was_color;
3158                 struct vc_data *vc = vc_cons[i].d;
3159
3160                 if (con_driver_map[i])
3161                         module_put(con_driver_map[i]->owner);
3162                 __module_get(owner);
3163                 con_driver_map[i] = csw;
3164
3165                 if (!vc || !vc->vc_sw)
3166                         continue;
3167
3168                 j = i;
3169
3170                 if (CON_IS_VISIBLE(vc)) {
3171                         k = i;
3172                         save_screen(vc);
3173                 }
3174
3175                 old_was_color = vc->vc_can_do_color;
3176                 vc->vc_sw->con_deinit(vc);
3177                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3178                 visual_init(vc, i, 0);
3179                 set_origin(vc);
3180                 update_attr(vc);
3181
3182                 /* If the console changed between mono <-> color, then
3183                  * the attributes in the screenbuf will be wrong.  The
3184                  * following resets all attributes to something sane.
3185                  */
3186                 if (old_was_color != vc->vc_can_do_color)
3187                         clear_buffer_attributes(vc);
3188         }
3189
3190         pr_info("Console: switching ");
3191         if (!deflt)
3192                 printk("consoles %d-%d ", first+1, last+1);
3193         if (j >= 0) {
3194                 struct vc_data *vc = vc_cons[j].d;
3195
3196                 printk("to %s %s %dx%d\n",
3197                        vc->vc_can_do_color ? "colour" : "mono",
3198                        desc, vc->vc_cols, vc->vc_rows);
3199
3200                 if (k >= 0) {
3201                         vc = vc_cons[k].d;
3202                         update_screen(vc);
3203                 }
3204         } else
3205                 printk("to %s\n", desc);
3206
3207         retval = 0;
3208 err:
3209         module_put(owner);
3210         return retval;
3211 };
3212
3213
3214 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3215 /* unlocked version of unbind_con_driver() */
3216 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3217 {
3218         struct module *owner = csw->owner;
3219         const struct consw *defcsw = NULL;
3220         struct con_driver *con_driver = NULL, *con_back = NULL;
3221         int i, retval = -ENODEV;
3222
3223         if (!try_module_get(owner))
3224                 return -ENODEV;
3225
3226         WARN_CONSOLE_UNLOCKED();
3227
3228         /* check if driver is registered and if it is unbindable */
3229         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3230                 con_driver = &registered_con_driver[i];
3231
3232                 if (con_driver->con == csw &&
3233                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3234                         retval = 0;
3235                         break;
3236                 }
3237         }
3238
3239         if (retval)
3240                 goto err;
3241
3242         retval = -ENODEV;
3243
3244         /* check if backup driver exists */
3245         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3246                 con_back = &registered_con_driver[i];
3247
3248                 if (con_back->con && con_back->con != csw) {
3249                         defcsw = con_back->con;
3250                         retval = 0;
3251                         break;
3252                 }
3253         }
3254
3255         if (retval)
3256                 goto err;
3257
3258         if (!con_is_bound(csw))
3259                 goto err;
3260
3261         first = max(first, con_driver->first);
3262         last = min(last, con_driver->last);
3263
3264         for (i = first; i <= last; i++) {
3265                 if (con_driver_map[i] == csw) {
3266                         module_put(csw->owner);
3267                         con_driver_map[i] = NULL;
3268                 }
3269         }
3270
3271         if (!con_is_bound(defcsw)) {
3272                 const struct consw *defconsw = conswitchp;
3273
3274                 defcsw->con_startup();
3275                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3276                 /*
3277                  * vgacon may change the default driver to point
3278                  * to dummycon, we restore it here...
3279                  */
3280                 conswitchp = defconsw;
3281         }
3282
3283         if (!con_is_bound(csw))
3284                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3285
3286         /* ignore return value, binding should not fail */
3287         do_bind_con_driver(defcsw, first, last, deflt);
3288 err:
3289         module_put(owner);
3290         return retval;
3291
3292 }
3293 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3294
3295 static int vt_bind(struct con_driver *con)
3296 {
3297         const struct consw *defcsw = NULL, *csw = NULL;
3298         int i, more = 1, first = -1, last = -1, deflt = 0;
3299
3300         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3301                 goto err;
3302
3303         csw = con->con;
3304
3305         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3306                 struct con_driver *con = &registered_con_driver[i];
3307
3308                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3309                         defcsw = con->con;
3310                         break;
3311                 }
3312         }
3313
3314         if (!defcsw)
3315                 goto err;
3316
3317         while (more) {
3318                 more = 0;
3319
3320                 for (i = con->first; i <= con->last; i++) {
3321                         if (con_driver_map[i] == defcsw) {
3322                                 if (first == -1)
3323                                         first = i;
3324                                 last = i;
3325                                 more = 1;
3326                         } else if (first != -1)
3327                                 break;
3328                 }
3329
3330                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3331                         deflt = 1;
3332
3333                 if (first != -1)
3334                         do_bind_con_driver(csw, first, last, deflt);
3335
3336                 first = -1;
3337                 last = -1;
3338                 deflt = 0;
3339         }
3340
3341 err:
3342         return 0;
3343 }
3344
3345 static int vt_unbind(struct con_driver *con)
3346 {
3347         const struct consw *csw = NULL;
3348         int i, more = 1, first = -1, last = -1, deflt = 0;
3349         int ret;
3350
3351         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3352                 goto err;
3353
3354         csw = con->con;
3355
3356         while (more) {
3357                 more = 0;
3358
3359                 for (i = con->first; i <= con->last; i++) {
3360                         if (con_driver_map[i] == csw) {
3361                                 if (first == -1)
3362                                         first = i;
3363                                 last = i;
3364                                 more = 1;
3365                         } else if (first != -1)
3366                                 break;
3367                 }
3368
3369                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3370                         deflt = 1;
3371
3372                 if (first != -1) {
3373                         ret = do_unbind_con_driver(csw, first, last, deflt);
3374                         if (ret != 0)
3375                                 return ret;
3376                 }
3377
3378                 first = -1;
3379                 last = -1;
3380                 deflt = 0;
3381         }
3382
3383 err:
3384         return 0;
3385 }
3386 #else
3387 static inline int vt_bind(struct con_driver *con)
3388 {
3389         return 0;
3390 }
3391 static inline int vt_unbind(struct con_driver *con)
3392 {
3393         return 0;
3394 }
3395 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3396
3397 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3398                           const char *buf, size_t count)
3399 {
3400         struct con_driver *con = dev_get_drvdata(dev);
3401         int bind = simple_strtoul(buf, NULL, 0);
3402
3403         console_lock();
3404
3405         if (bind)
3406                 vt_bind(con);
3407         else
3408                 vt_unbind(con);
3409
3410         console_unlock();
3411
3412         return count;
3413 }
3414
3415 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3416                          char *buf)
3417 {
3418         struct con_driver *con = dev_get_drvdata(dev);
3419         int bind = con_is_bound(con->con);
3420
3421         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3422 }
3423
3424 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3425                          char *buf)
3426 {
3427         struct con_driver *con = dev_get_drvdata(dev);
3428
3429         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3430                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3431                          con->desc);
3432
3433 }
3434
3435 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3436 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3437
3438 static struct attribute *con_dev_attrs[] = {
3439         &dev_attr_bind.attr,
3440         &dev_attr_name.attr,
3441         NULL
3442 };
3443
3444 ATTRIBUTE_GROUPS(con_dev);
3445
3446 static int vtconsole_init_device(struct con_driver *con)
3447 {
3448         con->flag |= CON_DRIVER_FLAG_ATTR;
3449         return 0;
3450 }
3451
3452 static void vtconsole_deinit_device(struct con_driver *con)
3453 {
3454         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3455 }
3456
3457 /**
3458  * con_is_bound - checks if driver is bound to the console
3459  * @csw: console driver
3460  *
3461  * RETURNS: zero if unbound, nonzero if bound
3462  *
3463  * Drivers can call this and if zero, they should release
3464  * all resources allocated on con_startup()
3465  */
3466 int con_is_bound(const struct consw *csw)
3467 {
3468         int i, bound = 0;
3469
3470         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3471                 if (con_driver_map[i] == csw) {
3472                         bound = 1;
3473                         break;
3474                 }
3475         }
3476
3477         return bound;
3478 }
3479 EXPORT_SYMBOL(con_is_bound);
3480
3481 /**
3482  * con_debug_enter - prepare the console for the kernel debugger
3483  * @sw: console driver
3484  *
3485  * Called when the console is taken over by the kernel debugger, this
3486  * function needs to save the current console state, then put the console
3487  * into a state suitable for the kernel debugger.
3488  *
3489  * RETURNS:
3490  * Zero on success, nonzero if a failure occurred when trying to prepare
3491  * the console for the debugger.
3492  */
3493 int con_debug_enter(struct vc_data *vc)
3494 {
3495         int ret = 0;
3496
3497         saved_fg_console = fg_console;
3498         saved_last_console = last_console;
3499         saved_want_console = want_console;
3500         saved_vc_mode = vc->vc_mode;
3501         saved_console_blanked = console_blanked;
3502         vc->vc_mode = KD_TEXT;
3503         console_blanked = 0;
3504         if (vc->vc_sw->con_debug_enter)
3505                 ret = vc->vc_sw->con_debug_enter(vc);
3506 #ifdef CONFIG_KGDB_KDB
3507         /* Set the initial LINES variable if it is not already set */
3508         if (vc->vc_rows < 999) {
3509                 int linecount;
3510                 char lns[4];
3511                 const char *setargs[3] = {
3512                         "set",
3513                         "LINES",
3514                         lns,
3515                 };
3516                 if (kdbgetintenv(setargs[0], &linecount)) {
3517                         snprintf(lns, 4, "%i", vc->vc_rows);
3518                         kdb_set(2, setargs);
3519                 }
3520         }
3521         if (vc->vc_cols < 999) {
3522                 int colcount;
3523                 char cols[4];
3524                 const char *setargs[3] = {
3525                         "set",
3526                         "COLUMNS",
3527                         cols,
3528                 };
3529                 if (kdbgetintenv(setargs[0], &colcount)) {
3530                         snprintf(cols, 4, "%i", vc->vc_cols);
3531                         kdb_set(2, setargs);
3532                 }
3533         }
3534 #endif /* CONFIG_KGDB_KDB */
3535         return ret;
3536 }
3537 EXPORT_SYMBOL_GPL(con_debug_enter);
3538
3539 /**
3540  * con_debug_leave - restore console state
3541  * @sw: console driver
3542  *
3543  * Restore the console state to what it was before the kernel debugger
3544  * was invoked.
3545  *
3546  * RETURNS:
3547  * Zero on success, nonzero if a failure occurred when trying to restore
3548  * the console.
3549  */
3550 int con_debug_leave(void)
3551 {
3552         struct vc_data *vc;
3553         int ret = 0;
3554
3555         fg_console = saved_fg_console;
3556         last_console = saved_last_console;
3557         want_console = saved_want_console;
3558         console_blanked = saved_console_blanked;
3559         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3560
3561         vc = vc_cons[fg_console].d;
3562         if (vc->vc_sw->con_debug_leave)
3563                 ret = vc->vc_sw->con_debug_leave(vc);
3564         return ret;
3565 }
3566 EXPORT_SYMBOL_GPL(con_debug_leave);
3567
3568 static int do_register_con_driver(const struct consw *csw, int first, int last)
3569 {
3570         struct module *owner = csw->owner;
3571         struct con_driver *con_driver;
3572         const char *desc;
3573         int i, retval = 0;
3574
3575         WARN_CONSOLE_UNLOCKED();
3576
3577         if (!try_module_get(owner))
3578                 return -ENODEV;
3579
3580         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3581                 con_driver = &registered_con_driver[i];
3582
3583                 /* already registered */
3584                 if (con_driver->con == csw)
3585                         retval = -EBUSY;
3586         }
3587
3588         if (retval)
3589                 goto err;
3590
3591         desc = csw->con_startup();
3592         if (!desc) {
3593                 retval = -ENODEV;
3594                 goto err;
3595         }
3596
3597         retval = -EINVAL;
3598
3599         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3600                 con_driver = &registered_con_driver[i];
3601
3602                 if (con_driver->con == NULL &&
3603                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3604                         con_driver->con = csw;
3605                         con_driver->desc = desc;
3606                         con_driver->node = i;
3607                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3608                                            CON_DRIVER_FLAG_INIT;
3609                         con_driver->first = first;
3610                         con_driver->last = last;
3611                         retval = 0;
3612                         break;
3613                 }
3614         }
3615
3616         if (retval)
3617                 goto err;
3618
3619         con_driver->dev =
3620                 device_create_with_groups(vtconsole_class, NULL,
3621                                           MKDEV(0, con_driver->node),
3622                                           con_driver, con_dev_groups,
3623                                           "vtcon%i", con_driver->node);
3624         if (IS_ERR(con_driver->dev)) {
3625                 printk(KERN_WARNING "Unable to create device for %s; "
3626                        "errno = %ld\n", con_driver->desc,
3627                        PTR_ERR(con_driver->dev));
3628                 con_driver->dev = NULL;
3629         } else {
3630                 vtconsole_init_device(con_driver);
3631         }
3632
3633 err:
3634         module_put(owner);
3635         return retval;
3636 }
3637
3638
3639 /**
3640  * do_unregister_con_driver - unregister console driver from console layer
3641  * @csw: console driver
3642  *
3643  * DESCRIPTION: All drivers that registers to the console layer must
3644  * call this function upon exit, or if the console driver is in a state
3645  * where it won't be able to handle console services, such as the
3646  * framebuffer console without loaded framebuffer drivers.
3647  *
3648  * The driver must unbind first prior to unregistration.
3649  */
3650 int do_unregister_con_driver(const struct consw *csw)
3651 {
3652         int i;
3653
3654         /* cannot unregister a bound driver */
3655         if (con_is_bound(csw))
3656                 return -EBUSY;
3657
3658         if (csw == conswitchp)
3659                 return -EINVAL;
3660
3661         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3662                 struct con_driver *con_driver = &registered_con_driver[i];
3663
3664                 if (con_driver->con == csw) {
3665                         /*
3666                          * Defer the removal of the sysfs entries since that
3667                          * will acquire the kernfs s_active lock and we can't
3668                          * acquire this lock while holding the console lock:
3669                          * the unbind sysfs entry imposes already the opposite
3670                          * order. Reset con already here to prevent any later
3671                          * lookup to succeed and mark this slot as zombie, so
3672                          * it won't get reused until we complete the removal
3673                          * in the deferred work.
3674                          */
3675                         con_driver->con = NULL;
3676                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3677                         schedule_work(&con_driver_unregister_work);
3678
3679                         return 0;
3680                 }
3681         }
3682
3683         return -ENODEV;
3684 }
3685 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3686
3687 static void con_driver_unregister_callback(struct work_struct *ignored)
3688 {
3689         int i;
3690
3691         console_lock();
3692
3693         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3694                 struct con_driver *con_driver = &registered_con_driver[i];
3695
3696                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3697                         continue;
3698
3699                 console_unlock();
3700
3701                 vtconsole_deinit_device(con_driver);
3702                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3703
3704                 console_lock();
3705
3706                 if (WARN_ON_ONCE(con_driver->con))
3707                         con_driver->con = NULL;
3708                 con_driver->desc = NULL;
3709                 con_driver->dev = NULL;
3710                 con_driver->node = 0;
3711                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3712                 con_driver->flag = 0;
3713                 con_driver->first = 0;
3714                 con_driver->last = 0;
3715         }
3716
3717         console_unlock();
3718 }
3719
3720 /*
3721  *      If we support more console drivers, this function is used
3722  *      when a driver wants to take over some existing consoles
3723  *      and become default driver for newly opened ones.
3724  *
3725  *      do_take_over_console is basically a register followed by unbind
3726  */
3727 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3728 {
3729         int err;
3730
3731         err = do_register_con_driver(csw, first, last);
3732         /*
3733          * If we get an busy error we still want to bind the console driver
3734          * and return success, as we may have unbound the console driver
3735          * but not unregistered it.
3736          */
3737         if (err == -EBUSY)
3738                 err = 0;
3739         if (!err)
3740                 do_bind_con_driver(csw, first, last, deflt);
3741
3742         return err;
3743 }
3744 EXPORT_SYMBOL_GPL(do_take_over_console);
3745
3746
3747 /*
3748  * give_up_console is a wrapper to unregister_con_driver. It will only
3749  * work if driver is fully unbound.
3750  */
3751 void give_up_console(const struct consw *csw)
3752 {
3753         console_lock();
3754         do_unregister_con_driver(csw);
3755         console_unlock();
3756 }
3757
3758 static int __init vtconsole_class_init(void)
3759 {
3760         int i;
3761
3762         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3763         if (IS_ERR(vtconsole_class)) {
3764                 printk(KERN_WARNING "Unable to create vt console class; "
3765                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3766                 vtconsole_class = NULL;
3767         }
3768
3769         /* Add system drivers to sysfs */
3770         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3771                 struct con_driver *con = &registered_con_driver[i];
3772
3773                 if (con->con && !con->dev) {
3774                         con->dev =
3775                                 device_create_with_groups(vtconsole_class, NULL,
3776                                                           MKDEV(0, con->node),
3777                                                           con, con_dev_groups,
3778                                                           "vtcon%i", con->node);
3779
3780                         if (IS_ERR(con->dev)) {
3781                                 printk(KERN_WARNING "Unable to create "
3782                                        "device for %s; errno = %ld\n",
3783                                        con->desc, PTR_ERR(con->dev));
3784                                 con->dev = NULL;
3785                         } else {
3786                                 vtconsole_init_device(con);
3787                         }
3788                 }
3789         }
3790
3791         return 0;
3792 }
3793 postcore_initcall(vtconsole_class_init);
3794
3795 #endif
3796
3797 /*
3798  *      Screen blanking
3799  */
3800
3801 static int set_vesa_blanking(char __user *p)
3802 {
3803         unsigned int mode;
3804
3805         if (get_user(mode, p + 1))
3806                 return -EFAULT;
3807
3808         vesa_blank_mode = (mode < 4) ? mode : 0;
3809         return 0;
3810 }
3811
3812 void do_blank_screen(int entering_gfx)
3813 {
3814         struct vc_data *vc = vc_cons[fg_console].d;
3815         int i;
3816
3817         WARN_CONSOLE_UNLOCKED();
3818
3819         if (console_blanked) {
3820                 if (blank_state == blank_vesa_wait) {
3821                         blank_state = blank_off;
3822                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3823                 }
3824                 return;
3825         }
3826
3827         /* entering graphics mode? */
3828         if (entering_gfx) {
3829                 hide_cursor(vc);
3830                 save_screen(vc);
3831                 vc->vc_sw->con_blank(vc, -1, 1);
3832                 console_blanked = fg_console + 1;
3833                 blank_state = blank_off;
3834                 set_origin(vc);
3835                 return;
3836         }
3837
3838         if (blank_state != blank_normal_wait)
3839                 return;
3840         blank_state = blank_off;
3841
3842         /* don't blank graphics */
3843         if (vc->vc_mode != KD_TEXT) {
3844                 console_blanked = fg_console + 1;
3845                 return;
3846         }
3847
3848         hide_cursor(vc);
3849         del_timer_sync(&console_timer);
3850         blank_timer_expired = 0;
3851
3852         save_screen(vc);
3853         /* In case we need to reset origin, blanking hook returns 1 */
3854         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3855         console_blanked = fg_console + 1;
3856         if (i)
3857                 set_origin(vc);
3858
3859         if (console_blank_hook && console_blank_hook(1))
3860                 return;
3861
3862         if (vesa_off_interval && vesa_blank_mode) {
3863                 blank_state = blank_vesa_wait;
3864                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3865         }
3866         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3867 }
3868 EXPORT_SYMBOL(do_blank_screen);
3869
3870 /*
3871  * Called by timer as well as from vt_console_driver
3872  */
3873 void do_unblank_screen(int leaving_gfx)
3874 {
3875         struct vc_data *vc;
3876
3877         /* This should now always be called from a "sane" (read: can schedule)
3878          * context for the sake of the low level drivers, except in the special
3879          * case of oops_in_progress
3880          */
3881         if (!oops_in_progress)
3882                 might_sleep();
3883
3884         WARN_CONSOLE_UNLOCKED();
3885
3886         ignore_poke = 0;
3887         if (!console_blanked)
3888                 return;
3889         if (!vc_cons_allocated(fg_console)) {
3890                 /* impossible */
3891                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3892                         fg_console + 1);
3893                 return;
3894         }
3895         vc = vc_cons[fg_console].d;
3896         /* Try to unblank in oops case too */
3897         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3898                 return; /* but leave console_blanked != 0 */
3899
3900         if (blankinterval) {
3901                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3902                 blank_state = blank_normal_wait;
3903         }
3904
3905         console_blanked = 0;
3906         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3907                 /* Low-level driver cannot restore -> do it ourselves */
3908                 update_screen(vc);
3909         if (console_blank_hook)
3910                 console_blank_hook(0);
3911         set_palette(vc);
3912         set_cursor(vc);
3913         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3914 }
3915 EXPORT_SYMBOL(do_unblank_screen);
3916
3917 /*
3918  * This is called by the outside world to cause a forced unblank, mostly for
3919  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3920  * call it with 1 as an argument and so force a mode restore... that may kill
3921  * X or at least garbage the screen but would also make the Oops visible...
3922  */
3923 void unblank_screen(void)
3924 {
3925         do_unblank_screen(0);
3926 }
3927
3928 /*
3929  * We defer the timer blanking to work queue so it can take the console mutex
3930  * (console operations can still happen at irq time, but only from printk which
3931  * has the console mutex. Not perfect yet, but better than no locking
3932  */
3933 static void blank_screen_t(unsigned long dummy)
3934 {
3935         if (unlikely(!keventd_up())) {
3936                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3937                 return;
3938         }
3939         blank_timer_expired = 1;
3940         schedule_work(&console_work);
3941 }
3942
3943 void poke_blanked_console(void)
3944 {
3945         WARN_CONSOLE_UNLOCKED();
3946
3947         /* Add this so we quickly catch whoever might call us in a non
3948          * safe context. Nowadays, unblank_screen() isn't to be called in
3949          * atomic contexts and is allowed to schedule (with the special case
3950          * of oops_in_progress, but that isn't of any concern for this
3951          * function. --BenH.
3952          */
3953         might_sleep();
3954
3955         /* This isn't perfectly race free, but a race here would be mostly harmless,
3956          * at worse, we'll do a spurrious blank and it's unlikely
3957          */
3958         del_timer(&console_timer);
3959         blank_timer_expired = 0;
3960
3961         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3962                 return;
3963         if (console_blanked)
3964                 unblank_screen();
3965         else if (blankinterval) {
3966                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3967                 blank_state = blank_normal_wait;
3968         }
3969 }
3970
3971 /*
3972  *      Palettes
3973  */
3974
3975 static void set_palette(struct vc_data *vc)
3976 {
3977         WARN_CONSOLE_UNLOCKED();
3978
3979         if (vc->vc_mode != KD_GRAPHICS)
3980                 vc->vc_sw->con_set_palette(vc, color_table);
3981 }
3982
3983 /*
3984  * Load palette into the DAC registers. arg points to a colour
3985  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3986  */
3987
3988 int con_set_cmap(unsigned char __user *arg)
3989 {
3990         int i, j, k;
3991         unsigned char colormap[3*16];
3992
3993         if (copy_from_user(colormap, arg, sizeof(colormap)))
3994                 return -EFAULT;
3995
3996         console_lock();
3997         for (i = k = 0; i < 16; i++) {
3998                 default_red[i] = colormap[k++];
3999                 default_grn[i] = colormap[k++];
4000                 default_blu[i] = colormap[k++];
4001         }
4002         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4003                 if (!vc_cons_allocated(i))
4004                         continue;
4005                 for (j = k = 0; j < 16; j++) {
4006                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4007                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4008                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4009                 }
4010                 set_palette(vc_cons[i].d);
4011         }
4012         console_unlock();
4013
4014         return 0;
4015 }
4016
4017 int con_get_cmap(unsigned char __user *arg)
4018 {
4019         int i, k;
4020         unsigned char colormap[3*16];
4021
4022         console_lock();
4023         for (i = k = 0; i < 16; i++) {
4024                 colormap[k++] = default_red[i];
4025                 colormap[k++] = default_grn[i];
4026                 colormap[k++] = default_blu[i];
4027         }
4028         console_unlock();
4029
4030         if (copy_to_user(arg, colormap, sizeof(colormap)))
4031                 return -EFAULT;
4032
4033         return 0;
4034 }
4035
4036 void reset_palette(struct vc_data *vc)
4037 {
4038         int j, k;
4039         for (j=k=0; j<16; j++) {
4040                 vc->vc_palette[k++] = default_red[j];
4041                 vc->vc_palette[k++] = default_grn[j];
4042                 vc->vc_palette[k++] = default_blu[j];
4043         }
4044         set_palette(vc);
4045 }
4046
4047 /*
4048  *  Font switching
4049  *
4050  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4051  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4052  *  depending on width) reserved for each character which is kinda wasty, but
4053  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4054  *  is up to the actual low-level console-driver convert data into its favorite
4055  *  format (maybe we should add a `fontoffset' field to the `display'
4056  *  structure so we won't have to convert the fontdata all the time.
4057  *  /Jes
4058  */
4059
4060 #define max_font_size 65536
4061
4062 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4063 {
4064         struct console_font font;
4065         int rc = -EINVAL;
4066         int c;
4067
4068         if (op->data) {
4069                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4070                 if (!font.data)
4071                         return -ENOMEM;
4072         } else
4073                 font.data = NULL;
4074
4075         console_lock();
4076         if (vc->vc_mode != KD_TEXT)
4077                 rc = -EINVAL;
4078         else if (vc->vc_sw->con_font_get)
4079                 rc = vc->vc_sw->con_font_get(vc, &font);
4080         else
4081                 rc = -ENOSYS;
4082         console_unlock();
4083
4084         if (rc)
4085                 goto out;
4086
4087         c = (font.width+7)/8 * 32 * font.charcount;
4088
4089         if (op->data && font.charcount > op->charcount)
4090                 rc = -ENOSPC;
4091         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4092                 if (font.width > op->width || font.height > op->height)
4093                         rc = -ENOSPC;
4094         } else {
4095                 if (font.width != 8)
4096                         rc = -EIO;
4097                 else if ((op->height && font.height > op->height) ||
4098                          font.height > 32)
4099                         rc = -ENOSPC;
4100         }
4101         if (rc)
4102                 goto out;
4103
4104         op->height = font.height;
4105         op->width = font.width;
4106         op->charcount = font.charcount;
4107
4108         if (op->data && copy_to_user(op->data, font.data, c))
4109                 rc = -EFAULT;
4110
4111 out:
4112         kfree(font.data);
4113         return rc;
4114 }
4115
4116 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4117 {
4118         struct console_font font;
4119         int rc = -EINVAL;
4120         int size;
4121
4122         if (vc->vc_mode != KD_TEXT)
4123                 return -EINVAL;
4124         if (!op->data)
4125                 return -EINVAL;
4126         if (op->charcount > 512)
4127                 return -EINVAL;
4128         if (!op->height) {              /* Need to guess font height [compat] */
4129                 int h, i;
4130                 u8 __user *charmap = op->data;
4131                 u8 tmp;
4132
4133                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4134                    so that we can get rid of this soon */
4135                 if (!(op->flags & KD_FONT_FLAG_OLD))
4136                         return -EINVAL;
4137                 for (h = 32; h > 0; h--)
4138                         for (i = 0; i < op->charcount; i++) {
4139                                 if (get_user(tmp, &charmap[32*i+h-1]))
4140                                         return -EFAULT;
4141                                 if (tmp)
4142                                         goto nonzero;
4143                         }
4144                 return -EINVAL;
4145         nonzero:
4146                 op->height = h;
4147         }
4148         if (op->width <= 0 || op->width > 32 || op->height > 32)
4149                 return -EINVAL;
4150         size = (op->width+7)/8 * 32 * op->charcount;
4151         if (size > max_font_size)
4152                 return -ENOSPC;
4153         font.charcount = op->charcount;
4154         font.height = op->height;
4155         font.width = op->width;
4156         font.data = memdup_user(op->data, size);
4157         if (IS_ERR(font.data))
4158                 return PTR_ERR(font.data);
4159         console_lock();
4160         if (vc->vc_mode != KD_TEXT)
4161                 rc = -EINVAL;
4162         else if (vc->vc_sw->con_font_set)
4163                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4164         else
4165                 rc = -ENOSYS;
4166         console_unlock();
4167         kfree(font.data);
4168         return rc;
4169 }
4170
4171 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4172 {
4173         struct console_font font = {.width = op->width, .height = op->height};
4174         char name[MAX_FONT_NAME];
4175         char *s = name;
4176         int rc;
4177
4178
4179         if (!op->data)
4180                 s = NULL;
4181         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4182                 return -EFAULT;
4183         else
4184                 name[MAX_FONT_NAME - 1] = 0;
4185
4186         console_lock();
4187         if (vc->vc_mode != KD_TEXT) {
4188                 console_unlock();
4189                 return -EINVAL;
4190         }
4191         if (vc->vc_sw->con_font_default)
4192                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4193         else
4194                 rc = -ENOSYS;
4195         console_unlock();
4196         if (!rc) {
4197                 op->width = font.width;
4198                 op->height = font.height;
4199         }
4200         return rc;
4201 }
4202
4203 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4204 {
4205         int con = op->height;
4206         int rc;
4207
4208
4209         console_lock();
4210         if (vc->vc_mode != KD_TEXT)
4211                 rc = -EINVAL;
4212         else if (!vc->vc_sw->con_font_copy)
4213                 rc = -ENOSYS;
4214         else if (con < 0 || !vc_cons_allocated(con))
4215                 rc = -ENOTTY;
4216         else if (con == vc->vc_num)     /* nothing to do */
4217                 rc = 0;
4218         else
4219                 rc = vc->vc_sw->con_font_copy(vc, con);
4220         console_unlock();
4221         return rc;
4222 }
4223
4224 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4225 {
4226         switch (op->op) {
4227         case KD_FONT_OP_SET:
4228                 return con_font_set(vc, op);
4229         case KD_FONT_OP_GET:
4230                 return con_font_get(vc, op);
4231         case KD_FONT_OP_SET_DEFAULT:
4232                 return con_font_default(vc, op);
4233         case KD_FONT_OP_COPY:
4234                 return con_font_copy(vc, op);
4235         }
4236         return -ENOSYS;
4237 }
4238
4239 /*
4240  *      Interface exported to selection and vcs.
4241  */
4242
4243 /* used by selection */
4244 u16 screen_glyph(struct vc_data *vc, int offset)
4245 {
4246         u16 w = scr_readw(screenpos(vc, offset, 1));
4247         u16 c = w & 0xff;
4248
4249         if (w & vc->vc_hi_font_mask)
4250                 c |= 0x100;
4251         return c;
4252 }
4253 EXPORT_SYMBOL_GPL(screen_glyph);
4254
4255 /* used by vcs - note the word offset */
4256 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4257 {
4258         return screenpos(vc, 2 * w_offset, viewed);
4259 }
4260
4261 void getconsxy(struct vc_data *vc, unsigned char *p)
4262 {
4263         p[0] = vc->vc_x;
4264         p[1] = vc->vc_y;
4265 }
4266
4267 void putconsxy(struct vc_data *vc, unsigned char *p)
4268 {
4269         hide_cursor(vc);
4270         gotoxy(vc, p[0], p[1]);
4271         set_cursor(vc);
4272 }
4273
4274 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4275 {
4276         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4277                 return softcursor_original;
4278         return scr_readw(org);
4279 }
4280
4281 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4282 {
4283         scr_writew(val, org);
4284         if ((unsigned long)org == vc->vc_pos) {
4285                 softcursor_original = -1;
4286                 add_softcursor(vc);
4287         }
4288 }
4289
4290 void vcs_scr_updated(struct vc_data *vc)
4291 {
4292         notify_update(vc);
4293 }
4294
4295 /*
4296  *      Visible symbols for modules
4297  */
4298
4299 EXPORT_SYMBOL(color_table);
4300 EXPORT_SYMBOL(default_red);
4301 EXPORT_SYMBOL(default_grn);
4302 EXPORT_SYMBOL(default_blu);
4303 EXPORT_SYMBOL(update_region);
4304 EXPORT_SYMBOL(redraw_screen);
4305 EXPORT_SYMBOL(vc_resize);
4306 EXPORT_SYMBOL(fg_console);
4307 EXPORT_SYMBOL(console_blank_hook);
4308 EXPORT_SYMBOL(console_blanked);
4309 EXPORT_SYMBOL(vc_cons);
4310 EXPORT_SYMBOL(global_cursor_default);
4311 #ifndef VT_SINGLE_DRIVER
4312 EXPORT_SYMBOL(give_up_console);
4313 #endif