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/signal.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;
 185 core_param(consoleblank, blankinterval, int, 0444);
 186
 187 static DECLARE_WORK(console_work, console_callback);
 188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 189
 190 /*
 191  * fg_console is the current virtual console,
 192  * last_console is the last used one,
 193  * want_console is the console we want to switch to,
 194  * saved_* variants are for save/restore around kernel debugger enter/leave
 195  */
 196 int fg_console;
 197 int last_console;
 198 int want_console = -1;
 199 static int saved_fg_console;
 200 static int saved_last_console;
 201 static int saved_want_console;
 202 static int saved_vc_mode;
 203 static int saved_console_blanked;
 204
 205 /*
 206  * For each existing display, we have a pointer to console currently visible
 207  * on that display, allowing consoles other than fg_console to be refreshed
 208  * appropriately. Unless the low-level driver supplies its own display_fg
 209  * variable, we use this one for the "master display".
 210  */
 211 static struct vc_data *master_display_fg;
 212
 213 /*
 214  * Unfortunately, we need to delay tty echo when we're currently writing to the
 215  * console since the code is (and always was) not re-entrant, so we schedule
 216  * all flip requests to process context with schedule-task() and run it from
 217  * console_callback().
 218  */
 219
 220 /*
 221  * For the same reason, we defer scrollback to the console callback.
 222  */
 223 static int scrollback_delta;
 224
 225 /*
 226  * Hook so that the power management routines can (un)blank
 227  * the console on our behalf.
 228  */
 229 int (*console_blank_hook)(int);
 230
 231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 232 static int blank_state;
 233 static int blank_timer_expired;
 234 enum {
 235         blank_off = 0,
 236         blank_normal_wait,
 237         blank_vesa_wait,
 238 };
 239
 240 /*
 241  * /sys/class/tty/tty0/
 242  *
 243  * the attribute 'active' contains the name of the current vc
 244  * console and it supports poll() to detect vc switches
 245  */
 246 static struct device *tty0dev;
 247
 248 /*
 249  * Notifier list for console events.
 250  */
 251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 252
 253 int register_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(register_vt_notifier);
 258
 259 int unregister_vt_notifier(struct notifier_block *nb)
 260 {
 261         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 262 }
 263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 264
 265 static void notify_write(struct vc_data *vc, unsigned int unicode)
 266 {
 267         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 269 }
 270
 271 static void notify_update(struct vc_data *vc)
 272 {
 273         struct vt_notifier_param param = { .vc = vc };
 274         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 275 }
 276 /*
 277  *      Low-Level Functions
 278  */
 279
 280 static inline bool con_is_fg(const struct vc_data *vc)
 281 {
 282         return vc->vc_num == fg_console;
 283 }
 284
 285 static inline bool con_should_update(const struct vc_data *vc)
 286 {
 287         return con_is_visible(vc) && !console_blanked;
 288 }
 289
 290 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 291 {
 292         unsigned short *p;
 293
 294         if (!viewed)
 295                 p = (unsigned short *)(vc->vc_origin + offset);
 296         else if (!vc->vc_sw->con_screen_pos)
 297                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 298         else
 299                 p = vc->vc_sw->con_screen_pos(vc, offset);
 300         return p;
 301 }
 302
 303 /* Called  from the keyboard irq path.. */
 304 static inline void scrolldelta(int lines)
 305 {
 306         /* FIXME */
 307         /* scrolldelta needs some kind of consistency lock, but the BKL was
 308            and still is not protecting versus the scheduled back end */
 309         scrollback_delta += lines;
 310         schedule_console_callback();
 311 }
 312
 313 void schedule_console_callback(void)
 314 {
 315         schedule_work(&console_work);
 316 }
 317
 318 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 319                 enum con_scroll dir, unsigned int nr)
 320 {
 321         u16 *clear, *d, *s;
 322
 323         if (t + nr >= b)
 324                 nr = b - t - 1;
 325         if (b > vc->vc_rows || t >= b || nr < 1)
 326                 return;
 327         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
 328                 return;
 329
 330         s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
 331         d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 332
 333         if (dir == SM_UP) {
 334                 clear = s + (b - t - nr) * vc->vc_cols;
 335                 swap(s, d);
 336         }
 337         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 338         scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
 339 }
 340
 341 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 342 {
 343         unsigned int xx, yy, offset;
 344         u16 *p;
 345
 346         p = (u16 *) start;
 347         if (!vc->vc_sw->con_getxy) {
 348                 offset = (start - vc->vc_origin) / 2;
 349                 xx = offset % vc->vc_cols;
 350                 yy = offset / vc->vc_cols;
 351         } else {
 352                 int nxx, nyy;
 353                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 354                 xx = nxx; yy = nyy;
 355         }
 356         for(;;) {
 357                 u16 attrib = scr_readw(p) & 0xff00;
 358                 int startx = xx;
 359                 u16 *q = p;
 360                 while (xx < vc->vc_cols && count) {
 361                         if (attrib != (scr_readw(p) & 0xff00)) {
 362                                 if (p > q)
 363                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 364                                 startx = xx;
 365                                 q = p;
 366                                 attrib = scr_readw(p) & 0xff00;
 367                         }
 368                         p++;
 369                         xx++;
 370                         count--;
 371                 }
 372                 if (p > q)
 373                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 374                 if (!count)
 375                         break;
 376                 xx = 0;
 377                 yy++;
 378                 if (vc->vc_sw->con_getxy) {
 379                         p = (u16 *)start;
 380                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 381                 }
 382         }
 383 }
 384
 385 void update_region(struct vc_data *vc, unsigned long start, int count)
 386 {
 387         WARN_CONSOLE_UNLOCKED();
 388
 389         if (con_should_update(vc)) {
 390                 hide_cursor(vc);
 391                 do_update_region(vc, start, count);
 392                 set_cursor(vc);
 393         }
 394 }
 395
 396 /* Structure of attributes is hardware-dependent */
 397
 398 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 399     u8 _underline, u8 _reverse, u8 _italic)
 400 {
 401         if (vc->vc_sw->con_build_attr)
 402                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 403                        _blink, _underline, _reverse, _italic);
 404
 405 /*
 406  * ++roman: I completely changed the attribute format for monochrome
 407  * mode (!can_do_color). The formerly used MDA (monochrome display
 408  * adapter) format didn't allow the combination of certain effects.
 409  * Now the attribute is just a bit vector:
 410  *  Bit 0..1: intensity (0..2)
 411  *  Bit 2   : underline
 412  *  Bit 3   : reverse
 413  *  Bit 7   : blink
 414  */
 415         {
 416         u8 a = _color;
 417         if (!vc->vc_can_do_color)
 418                 return _intensity |
 419                        (_italic ? 2 : 0) |
 420                        (_underline ? 4 : 0) |
 421                        (_reverse ? 8 : 0) |
 422                        (_blink ? 0x80 : 0);
 423         if (_italic)
 424                 a = (a & 0xF0) | vc->vc_itcolor;
 425         else if (_underline)
 426                 a = (a & 0xf0) | vc->vc_ulcolor;
 427         else if (_intensity == 0)
 428                 a = (a & 0xf0) | vc->vc_halfcolor;
 429         if (_reverse)
 430                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 431         if (_blink)
 432                 a ^= 0x80;
 433         if (_intensity == 2)
 434                 a ^= 0x08;
 435         if (vc->vc_hi_font_mask == 0x100)
 436                 a <<= 1;
 437         return a;
 438         }
 439 }
 440
 441 static void update_attr(struct vc_data *vc)
 442 {
 443         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 444                       vc->vc_blink, vc->vc_underline,
 445                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 446         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 447 }
 448
 449 /* Note: inverting the screen twice should revert to the original state */
 450 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 451 {
 452         unsigned short *p;
 453
 454         WARN_CONSOLE_UNLOCKED();
 455
 456         count /= 2;
 457         p = screenpos(vc, offset, viewed);
 458         if (vc->vc_sw->con_invert_region) {
 459                 vc->vc_sw->con_invert_region(vc, p, count);
 460         } else {
 461                 u16 *q = p;
 462                 int cnt = count;
 463                 u16 a;
 464
 465                 if (!vc->vc_can_do_color) {
 466                         while (cnt--) {
 467                             a = scr_readw(q);
 468                             a ^= 0x0800;
 469                             scr_writew(a, q);
 470                             q++;
 471                         }
 472                 } else if (vc->vc_hi_font_mask == 0x100) {
 473                         while (cnt--) {
 474                                 a = scr_readw(q);
 475                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 476                                 scr_writew(a, q);
 477                                 q++;
 478                         }
 479                 } else {
 480                         while (cnt--) {
 481                                 a = scr_readw(q);
 482                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 483                                 scr_writew(a, q);
 484                                 q++;
 485                         }
 486                 }
 487         }
 488
 489         if (con_should_update(vc))
 490                 do_update_region(vc, (unsigned long) p, count);
 491         notify_update(vc);
 492 }
 493
 494 /* used by selection: complement pointer position */
 495 void complement_pos(struct vc_data *vc, int offset)
 496 {
 497         static int old_offset = -1;
 498         static unsigned short old;
 499         static unsigned short oldx, oldy;
 500
 501         WARN_CONSOLE_UNLOCKED();
 502
 503         if (old_offset != -1 && old_offset >= 0 &&
 504             old_offset < vc->vc_screenbuf_size) {
 505                 scr_writew(old, screenpos(vc, old_offset, 1));
 506                 if (con_should_update(vc))
 507                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 508                 notify_update(vc);
 509         }
 510
 511         old_offset = offset;
 512
 513         if (offset != -1 && offset >= 0 &&
 514             offset < vc->vc_screenbuf_size) {
 515                 unsigned short new;
 516                 unsigned short *p;
 517                 p = screenpos(vc, offset, 1);
 518                 old = scr_readw(p);
 519                 new = old ^ vc->vc_complement_mask;
 520                 scr_writew(new, p);
 521                 if (con_should_update(vc)) {
 522                         oldx = (offset >> 1) % vc->vc_cols;
 523                         oldy = (offset >> 1) / vc->vc_cols;
 524                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 525                 }
 526                 notify_update(vc);
 527         }
 528 }
 529
 530 static void insert_char(struct vc_data *vc, unsigned int nr)
 531 {
 532         unsigned short *p = (unsigned short *) vc->vc_pos;
 533
 534         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 535         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 536         vc->vc_need_wrap = 0;
 537         if (con_should_update(vc))
 538                 do_update_region(vc, (unsigned long) p,
 539                         vc->vc_cols - vc->vc_x);
 540 }
 541
 542 static void delete_char(struct vc_data *vc, unsigned int nr)
 543 {
 544         unsigned short *p = (unsigned short *) vc->vc_pos;
 545
 546         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 547         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 548                         nr * 2);
 549         vc->vc_need_wrap = 0;
 550         if (con_should_update(vc))
 551                 do_update_region(vc, (unsigned long) p,
 552                         vc->vc_cols - vc->vc_x);
 553 }
 554
 555 static int softcursor_original = -1;
 556
 557 static void add_softcursor(struct vc_data *vc)
 558 {
 559         int i = scr_readw((u16 *) vc->vc_pos);
 560         u32 type = vc->vc_cursor_type;
 561
 562         if (! (type & 0x10)) return;
 563         if (softcursor_original != -1) return;
 564         softcursor_original = i;
 565         i |= ((type >> 8) & 0xff00 );
 566         i ^= ((type) & 0xff00 );
 567         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 568         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 569         scr_writew(i, (u16 *) vc->vc_pos);
 570         if (con_should_update(vc))
 571                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 572 }
 573
 574 static void hide_softcursor(struct vc_data *vc)
 575 {
 576         if (softcursor_original != -1) {
 577                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 578                 if (con_should_update(vc))
 579                         vc->vc_sw->con_putc(vc, softcursor_original,
 580                                         vc->vc_y, vc->vc_x);
 581                 softcursor_original = -1;
 582         }
 583 }
 584
 585 static void hide_cursor(struct vc_data *vc)
 586 {
 587         if (vc_is_sel(vc))
 588                 clear_selection();
 589
 590         vc->vc_sw->con_cursor(vc, CM_ERASE);
 591         hide_softcursor(vc);
 592 }
 593
 594 static void set_cursor(struct vc_data *vc)
 595 {
 596         if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
 597                 return;
 598         if (vc->vc_deccm) {
 599                 if (vc_is_sel(vc))
 600                         clear_selection();
 601                 add_softcursor(vc);
 602                 if ((vc->vc_cursor_type & 0x0f) != 1)
 603                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 604         } else
 605                 hide_cursor(vc);
 606 }
 607
 608 static void set_origin(struct vc_data *vc)
 609 {
 610         WARN_CONSOLE_UNLOCKED();
 611
 612         if (!con_is_visible(vc) ||
 613             !vc->vc_sw->con_set_origin ||
 614             !vc->vc_sw->con_set_origin(vc))
 615                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 616         vc->vc_visible_origin = vc->vc_origin;
 617         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 618         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 619 }
 620
 621 static void save_screen(struct vc_data *vc)
 622 {
 623         WARN_CONSOLE_UNLOCKED();
 624
 625         if (vc->vc_sw->con_save_screen)
 626                 vc->vc_sw->con_save_screen(vc);
 627 }
 628
 629 static void flush_scrollback(struct vc_data *vc)
 630 {
 631         WARN_CONSOLE_UNLOCKED();
 632
 633         if (vc->vc_sw->con_flush_scrollback)
 634                 vc->vc_sw->con_flush_scrollback(vc);
 635 }
 636
 637 /*
 638  *      Redrawing of screen
 639  */
 640
 641 void clear_buffer_attributes(struct vc_data *vc)
 642 {
 643         unsigned short *p = (unsigned short *)vc->vc_origin;
 644         int count = vc->vc_screenbuf_size / 2;
 645         int mask = vc->vc_hi_font_mask | 0xff;
 646
 647         for (; count > 0; count--, p++) {
 648                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 649         }
 650 }
 651
 652 void redraw_screen(struct vc_data *vc, int is_switch)
 653 {
 654         int redraw = 0;
 655
 656         WARN_CONSOLE_UNLOCKED();
 657
 658         if (!vc) {
 659                 /* strange ... */
 660                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 661                 return;
 662         }
 663
 664         if (is_switch) {
 665                 struct vc_data *old_vc = vc_cons[fg_console].d;
 666                 if (old_vc == vc)
 667                         return;
 668                 if (!con_is_visible(vc))
 669                         redraw = 1;
 670                 *vc->vc_display_fg = vc;
 671                 fg_console = vc->vc_num;
 672                 hide_cursor(old_vc);
 673                 if (!con_is_visible(old_vc)) {
 674                         save_screen(old_vc);
 675                         set_origin(old_vc);
 676                 }
 677                 if (tty0dev)
 678                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 679         } else {
 680                 hide_cursor(vc);
 681                 redraw = 1;
 682         }
 683
 684         if (redraw) {
 685                 int update;
 686                 int old_was_color = vc->vc_can_do_color;
 687
 688                 set_origin(vc);
 689                 update = vc->vc_sw->con_switch(vc);
 690                 set_palette(vc);
 691                 /*
 692                  * If console changed from mono<->color, the best we can do
 693                  * is to clear the buffer attributes. As it currently stands,
 694                  * rebuilding new attributes from the old buffer is not doable
 695                  * without overly complex code.
 696                  */
 697                 if (old_was_color != vc->vc_can_do_color) {
 698                         update_attr(vc);
 699                         clear_buffer_attributes(vc);
 700                 }
 701
 702                 /* Forcibly update if we're panicing */
 703                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 704                     vt_force_oops_output(vc))
 705                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 706         }
 707         set_cursor(vc);
 708         if (is_switch) {
 709                 set_leds();
 710                 compute_shiftstate();
 711                 notify_update(vc);
 712         }
 713 }
 714
 715 /*
 716  *      Allocation, freeing and resizing of VTs.
 717  */
 718
 719 int vc_cons_allocated(unsigned int i)
 720 {
 721         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 722 }
 723
 724 static void visual_init(struct vc_data *vc, int num, int init)
 725 {
 726         /* ++Geert: vc->vc_sw->con_init determines console size */
 727         if (vc->vc_sw)
 728                 module_put(vc->vc_sw->owner);
 729         vc->vc_sw = conswitchp;
 730 #ifndef VT_SINGLE_DRIVER
 731         if (con_driver_map[num])
 732                 vc->vc_sw = con_driver_map[num];
 733 #endif
 734         __module_get(vc->vc_sw->owner);
 735         vc->vc_num = num;
 736         vc->vc_display_fg = &master_display_fg;
 737         if (vc->vc_uni_pagedir_loc)
 738                 con_free_unimap(vc);
 739         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 740         vc->vc_uni_pagedir = NULL;
 741         vc->vc_hi_font_mask = 0;
 742         vc->vc_complement_mask = 0;
 743         vc->vc_can_do_color = 0;
 744         vc->vc_panic_force_write = false;
 745         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
 746         vc->vc_sw->con_init(vc, init);
 747         if (!vc->vc_complement_mask)
 748                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 749         vc->vc_s_complement_mask = vc->vc_complement_mask;
 750         vc->vc_size_row = vc->vc_cols << 1;
 751         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 752 }
 753
 754 static void vc_port_destruct(struct tty_port *port)
 755 {
 756         struct vc_data *vc = container_of(port, struct vc_data, port);
 757
 758         kfree(vc);
 759 }
 760
 761 static const struct tty_port_operations vc_port_ops = {
 762         .destruct = vc_port_destruct,
 763 };
 764
 765 /*
 766  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 767  * [this is to be used together with some user program
 768  * like resize that changes the hardware videomode]
 769  */
 770 #define VC_MAXCOL (32767)
 771 #define VC_MAXROW (32767)
 772
 773 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 774 {
 775         struct vt_notifier_param param;
 776         struct vc_data *vc;
 777         int err;
 778
 779         WARN_CONSOLE_UNLOCKED();
 780
 781         if (currcons >= MAX_NR_CONSOLES)
 782                 return -ENXIO;
 783
 784         if (vc_cons[currcons].d)
 785                 return 0;
 786
 787         /* due to the granularity of kmalloc, we waste some memory here */
 788         /* the alloc is done in two steps, to optimize the common situation
 789            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 790         /* although the numbers above are not valid since long ago, the
 791            point is still up-to-date and the comment still has its value
 792            even if only as a historical artifact.  --mj, July 1998 */
 793         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 794         if (!vc)
 795                 return -ENOMEM;
 796
 797         vc_cons[currcons].d = vc;
 798         tty_port_init(&vc->port);
 799         vc->port.ops = &vc_port_ops;
 800         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 801
 802         visual_init(vc, currcons, 1);
 803
 804         if (!*vc->vc_uni_pagedir_loc)
 805                 con_set_default_unimap(vc);
 806
 807         err = -EINVAL;
 808         if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
 809             vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
 810                 goto err_free;
 811         err = -ENOMEM;
 812         vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 813         if (!vc->vc_screenbuf)
 814                 goto err_free;
 815
 816         /* If no drivers have overridden us and the user didn't pass a
 817            boot option, default to displaying the cursor */
 818         if (global_cursor_default == -1)
 819                 global_cursor_default = 1;
 820
 821         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 822         vcs_make_sysfs(currcons);
 823         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 824
 825         return 0;
 826 err_free:
 827         kfree(vc);
 828         vc_cons[currcons].d = NULL;
 829         return err;
 830 }
 831
 832 static inline int resize_screen(struct vc_data *vc, int width, int height,
 833                                 int user)
 834 {
 835         /* Resizes the resolution of the display adapater */
 836         int err = 0;
 837
 838         if (vc->vc_sw->con_resize)
 839                 err = vc->vc_sw->con_resize(vc, width, height, user);
 840
 841         return err;
 842 }
 843
 844 /**
 845  *      vc_do_resize    -       resizing method for the tty
 846  *      @tty: tty being resized
 847  *      @real_tty: real tty (different to tty if a pty/tty pair)
 848  *      @vc: virtual console private data
 849  *      @cols: columns
 850  *      @lines: lines
 851  *
 852  *      Resize a virtual console, clipping according to the actual constraints.
 853  *      If the caller passes a tty structure then update the termios winsize
 854  *      information and perform any necessary signal handling.
 855  *
 856  *      Caller must hold the console semaphore. Takes the termios rwsem and
 857  *      ctrl_lock of the tty IFF a tty is passed.
 858  */
 859
 860 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 861                                 unsigned int cols, unsigned int lines)
 862 {
 863         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 864         unsigned long end;
 865         unsigned int old_rows, old_row_size;
 866         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 867         unsigned int user;
 868         unsigned short *oldscreen, *newscreen;
 869
 870         WARN_CONSOLE_UNLOCKED();
 871
 872         if (!vc)
 873                 return -ENXIO;
 874
 875         user = vc->vc_resize_user;
 876         vc->vc_resize_user = 0;
 877
 878         if (cols > VC_MAXCOL || lines > VC_MAXROW)
 879                 return -EINVAL;
 880
 881         new_cols = (cols ? cols : vc->vc_cols);
 882         new_rows = (lines ? lines : vc->vc_rows);
 883         new_row_size = new_cols << 1;
 884         new_screen_size = new_row_size * new_rows;
 885
 886         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
 887                 /*
 888                  * This function is being called here to cover the case
 889                  * where the userspace calls the FBIOPUT_VSCREENINFO twice,
 890                  * passing the same fb_var_screeninfo containing the fields
 891                  * yres/xres equal to a number non-multiple of vc_font.height
 892                  * and yres_virtual/xres_virtual equal to number lesser than the
 893                  * vc_font.height and yres/xres.
 894                  * In the second call, the struct fb_var_screeninfo isn't
 895                  * being modified by the underlying driver because of the
 896                  * if above, and this causes the fbcon_display->vrows to become
 897                  * negative and it eventually leads to out-of-bound
 898                  * access by the imageblit function.
 899                  * To give the correct values to the struct and to not have
 900                  * to deal with possible errors from the code below, we call
 901                  * the resize_screen here as well.
 902                  */
 903                 return resize_screen(vc, new_cols, new_rows, user);
 904         }
 905
 906         if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
 907                 return -EINVAL;
 908         newscreen = kzalloc(new_screen_size, GFP_USER);
 909         if (!newscreen)
 910                 return -ENOMEM;
 911
 912         if (vc_is_sel(vc))
 913                 clear_selection();
 914
 915         old_rows = vc->vc_rows;
 916         old_row_size = vc->vc_size_row;
 917
 918         err = resize_screen(vc, new_cols, new_rows, user);
 919         if (err) {
 920                 kfree(newscreen);
 921                 return err;
 922         }
 923
 924         vc->vc_rows = new_rows;
 925         vc->vc_cols = new_cols;
 926         vc->vc_size_row = new_row_size;
 927         vc->vc_screenbuf_size = new_screen_size;
 928
 929         rlth = min(old_row_size, new_row_size);
 930         rrem = new_row_size - rlth;
 931         old_origin = vc->vc_origin;
 932         new_origin = (long) newscreen;
 933         new_scr_end = new_origin + new_screen_size;
 934
 935         if (vc->vc_y > new_rows) {
 936                 if (old_rows - vc->vc_y < new_rows) {
 937                         /*
 938                          * Cursor near the bottom, copy contents from the
 939                          * bottom of buffer
 940                          */
 941                         old_origin += (old_rows - new_rows) * old_row_size;
 942                 } else {
 943                         /*
 944                          * Cursor is in no man's land, copy 1/2 screenful
 945                          * from the top and bottom of cursor position
 946                          */
 947                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 948                 }
 949         }
 950
 951         end = old_origin + old_row_size * min(old_rows, new_rows);
 952
 953         update_attr(vc);
 954
 955         while (old_origin < end) {
 956                 scr_memcpyw((unsigned short *) new_origin,
 957                             (unsigned short *) old_origin, rlth);
 958                 if (rrem)
 959                         scr_memsetw((void *)(new_origin + rlth),
 960                                     vc->vc_video_erase_char, rrem);
 961                 old_origin += old_row_size;
 962                 new_origin += new_row_size;
 963         }
 964         if (new_scr_end > new_origin)
 965                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 966                             new_scr_end - new_origin);
 967         oldscreen = vc->vc_screenbuf;
 968         vc->vc_screenbuf = newscreen;
 969         vc->vc_screenbuf_size = new_screen_size;
 970         set_origin(vc);
 971         kfree(oldscreen);
 972
 973         /* do part of a reset_terminal() */
 974         vc->vc_top = 0;
 975         vc->vc_bottom = vc->vc_rows;
 976         gotoxy(vc, vc->vc_x, vc->vc_y);
 977         save_cur(vc);
 978
 979         if (tty) {
 980                 /* Rewrite the requested winsize data with the actual
 981                    resulting sizes */
 982                 struct winsize ws;
 983                 memset(&ws, 0, sizeof(ws));
 984                 ws.ws_row = vc->vc_rows;
 985                 ws.ws_col = vc->vc_cols;
 986                 ws.ws_ypixel = vc->vc_scan_lines;
 987                 tty_do_resize(tty, &ws);
 988         }
 989
 990         if (con_is_visible(vc))
 991                 update_screen(vc);
 992         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 993         notify_update(vc);
 994         return err;
 995 }
 996
 997 /**
 998  *      vc_resize               -       resize a VT
 999  *      @vc: virtual console
1000  *      @cols: columns
1001  *      @rows: rows
1002  *
1003  *      Resize a virtual console as seen from the console end of things. We
1004  *      use the common vc_do_resize methods to update the structures. The
1005  *      caller must hold the console sem to protect console internals and
1006  *      vc->port.tty
1007  */
1008
1009 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1010 {
1011         return vc_do_resize(vc->port.tty, vc, cols, rows);
1012 }
1013
1014 /**
1015  *      vt_resize               -       resize a VT
1016  *      @tty: tty to resize
1017  *      @ws: winsize attributes
1018  *
1019  *      Resize a virtual terminal. This is called by the tty layer as we
1020  *      register our own handler for resizing. The mutual helper does all
1021  *      the actual work.
1022  *
1023  *      Takes the console sem and the called methods then take the tty
1024  *      termios_rwsem and the tty ctrl_lock in that order.
1025  */
1026 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1027 {
1028         struct vc_data *vc = tty->driver_data;
1029         int ret;
1030
1031         console_lock();
1032         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1033         console_unlock();
1034         return ret;
1035 }
1036
1037 struct vc_data *vc_deallocate(unsigned int currcons)
1038 {
1039         struct vc_data *vc = NULL;
1040
1041         WARN_CONSOLE_UNLOCKED();
1042
1043         if (vc_cons_allocated(currcons)) {
1044                 struct vt_notifier_param param;
1045
1046                 param.vc = vc = vc_cons[currcons].d;
1047                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1048                 vcs_remove_sysfs(currcons);
1049                 vc->vc_sw->con_deinit(vc);
1050                 put_pid(vc->vt_pid);
1051                 module_put(vc->vc_sw->owner);
1052                 kfree(vc->vc_screenbuf);
1053                 vc_cons[currcons].d = NULL;
1054         }
1055         return vc;
1056 }
1057
1058 /*
1059  *      VT102 emulator
1060  */
1061
1062 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1063 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1064 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1065
1066 #define decarm          VC_REPEAT
1067 #define decckm          VC_CKMODE
1068 #define kbdapplic       VC_APPLIC
1069 #define lnm             VC_CRLF
1070
1071 /*
1072  * this is what the terminal answers to a ESC-Z or csi0c query.
1073  */
1074 #define VT100ID "\033[?1;2c"
1075 #define VT102ID "\033[?6c"
1076
1077 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1078                                        8,12,10,14, 9,13,11,15 };
1079
1080 /* the default colour table, for VGA+ colour systems */
1081 unsigned char default_red[] = {
1082         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1083         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1084 };
1085 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1086
1087 unsigned char default_grn[] = {
1088         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1089         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1090 };
1091 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1092
1093 unsigned char default_blu[] = {
1094         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1095         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1096 };
1097 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1098
1099 /*
1100  * gotoxy() must verify all boundaries, because the arguments
1101  * might also be negative. If the given position is out of
1102  * bounds, the cursor is placed at the nearest margin.
1103  */
1104 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1105 {
1106         int min_y, max_y;
1107
1108         if (new_x < 0)
1109                 vc->vc_x = 0;
1110         else {
1111                 if (new_x >= vc->vc_cols)
1112                         vc->vc_x = vc->vc_cols - 1;
1113                 else
1114                         vc->vc_x = new_x;
1115         }
1116
1117         if (vc->vc_decom) {
1118                 min_y = vc->vc_top;
1119                 max_y = vc->vc_bottom;
1120         } else {
1121                 min_y = 0;
1122                 max_y = vc->vc_rows;
1123         }
1124         if (new_y < min_y)
1125                 vc->vc_y = min_y;
1126         else if (new_y >= max_y)
1127                 vc->vc_y = max_y - 1;
1128         else
1129                 vc->vc_y = new_y;
1130         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1131         vc->vc_need_wrap = 0;
1132 }
1133
1134 /* for absolute user moves, when decom is set */
1135 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1136 {
1137         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1138 }
1139
1140 void scrollback(struct vc_data *vc)
1141 {
1142         scrolldelta(-(vc->vc_rows / 2));
1143 }
1144
1145 void scrollfront(struct vc_data *vc, int lines)
1146 {
1147         if (!lines)
1148                 lines = vc->vc_rows / 2;
1149         scrolldelta(lines);
1150 }
1151
1152 static void lf(struct vc_data *vc)
1153 {
1154         /* don't scroll if above bottom of scrolling region, or
1155          * if below scrolling region
1156          */
1157         if (vc->vc_y + 1 == vc->vc_bottom)
1158                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1159         else if (vc->vc_y < vc->vc_rows - 1) {
1160                 vc->vc_y++;
1161                 vc->vc_pos += vc->vc_size_row;
1162         }
1163         vc->vc_need_wrap = 0;
1164         notify_write(vc, '\n');
1165 }
1166
1167 static void ri(struct vc_data *vc)
1168 {
1169         /* don't scroll if below top of scrolling region, or
1170          * if above scrolling region
1171          */
1172         if (vc->vc_y == vc->vc_top)
1173                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1174         else if (vc->vc_y > 0) {
1175                 vc->vc_y--;
1176                 vc->vc_pos -= vc->vc_size_row;
1177         }
1178         vc->vc_need_wrap = 0;
1179 }
1180
1181 static inline void cr(struct vc_data *vc)
1182 {
1183         vc->vc_pos -= vc->vc_x << 1;
1184         vc->vc_need_wrap = vc->vc_x = 0;
1185         notify_write(vc, '\r');
1186 }
1187
1188 static inline void bs(struct vc_data *vc)
1189 {
1190         if (vc->vc_x) {
1191                 vc->vc_pos -= 2;
1192                 vc->vc_x--;
1193                 vc->vc_need_wrap = 0;
1194                 notify_write(vc, '\b');
1195         }
1196 }
1197
1198 static inline void del(struct vc_data *vc)
1199 {
1200         /* ignored */
1201 }
1202
1203 static void csi_J(struct vc_data *vc, int vpar)
1204 {
1205         unsigned int count;
1206         unsigned short * start;
1207
1208         switch (vpar) {
1209                 case 0: /* erase from cursor to end of display */
1210                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1211                         start = (unsigned short *)vc->vc_pos;
1212                         break;
1213                 case 1: /* erase from start to cursor */
1214                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1215                         start = (unsigned short *)vc->vc_origin;
1216                         break;
1217                 case 3: /* erase scroll-back buffer (and whole display) */
1218                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1219                                     vc->vc_screenbuf_size);
1220                         flush_scrollback(vc);
1221                         set_origin(vc);
1222                         if (con_is_visible(vc))
1223                                 update_screen(vc);
1224                         /* fall through */
1225                 case 2: /* erase whole display */
1226                         count = vc->vc_cols * vc->vc_rows;
1227                         start = (unsigned short *)vc->vc_origin;
1228                         break;
1229                 default:
1230                         return;
1231         }
1232         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1233         if (con_should_update(vc))
1234                 do_update_region(vc, (unsigned long) start, count);
1235         vc->vc_need_wrap = 0;
1236 }
1237
1238 static void csi_K(struct vc_data *vc, int vpar)
1239 {
1240         unsigned int count;
1241         unsigned short * start;
1242
1243         switch (vpar) {
1244                 case 0: /* erase from cursor to end of line */
1245                         count = vc->vc_cols - vc->vc_x;
1246                         start = (unsigned short *)vc->vc_pos;
1247                         break;
1248                 case 1: /* erase from start of line to cursor */
1249                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1250                         count = vc->vc_x + 1;
1251                         break;
1252                 case 2: /* erase whole line */
1253                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1254                         count = vc->vc_cols;
1255                         break;
1256                 default:
1257                         return;
1258         }
1259         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1260         vc->vc_need_wrap = 0;
1261         if (con_should_update(vc))
1262                 do_update_region(vc, (unsigned long) start, count);
1263 }
1264
1265 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1266 {                                         /* not vt100? */
1267         int count;
1268
1269         if (!vpar)
1270                 vpar++;
1271         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1272
1273         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1274         if (con_should_update(vc))
1275                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1276         vc->vc_need_wrap = 0;
1277 }
1278
1279 static void default_attr(struct vc_data *vc)
1280 {
1281         vc->vc_intensity = 1;
1282         vc->vc_italic = 0;
1283         vc->vc_underline = 0;
1284         vc->vc_reverse = 0;
1285         vc->vc_blink = 0;
1286         vc->vc_color = vc->vc_def_color;
1287 }
1288
1289 struct rgb { u8 r; u8 g; u8 b; };
1290
1291 static void rgb_from_256(int i, struct rgb *c)
1292 {
1293         if (i < 8) {            /* Standard colours. */
1294                 c->r = i&1 ? 0xaa : 0x00;
1295                 c->g = i&2 ? 0xaa : 0x00;
1296                 c->b = i&4 ? 0xaa : 0x00;
1297         } else if (i < 16) {
1298                 c->r = i&1 ? 0xff : 0x55;
1299                 c->g = i&2 ? 0xff : 0x55;
1300                 c->b = i&4 ? 0xff : 0x55;
1301         } else if (i < 232) {   /* 6x6x6 colour cube. */
1302                 c->r = (i - 16) / 36 * 85 / 2;
1303                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1304                 c->b = (i - 16) % 6 * 85 / 2;
1305         } else                  /* Grayscale ramp. */
1306                 c->r = c->g = c->b = i * 10 - 2312;
1307 }
1308
1309 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1310 {
1311         u8 hue = 0, max = max3(c->r, c->g, c->b);
1312
1313         if (c->r > max / 2)
1314                 hue |= 4;
1315         if (c->g > max / 2)
1316                 hue |= 2;
1317         if (c->b > max / 2)
1318                 hue |= 1;
1319
1320         if (hue == 7 && max <= 0x55) {
1321                 hue = 0;
1322                 vc->vc_intensity = 2;
1323         } else if (max > 0xaa)
1324                 vc->vc_intensity = 2;
1325         else
1326                 vc->vc_intensity = 1;
1327
1328         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1329 }
1330
1331 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1332 {
1333         /* For backgrounds, err on the dark side. */
1334         vc->vc_color = (vc->vc_color & 0x0f)
1335                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1336 }
1337
1338 /*
1339  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1340  * and thus need to be detected and ignored by hand. Strictly speaking, that
1341  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1342  * no one produces such codes and almost no one accepts them.
1343  *
1344  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1345  * supporting them.
1346  */
1347 static int vc_t416_color(struct vc_data *vc, int i,
1348                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1349 {
1350         struct rgb c;
1351
1352         i++;
1353         if (i > vc->vc_npar)
1354                 return i;
1355
1356         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1357                 /* 256 colours */
1358                 i++;
1359                 rgb_from_256(vc->vc_par[i], &c);
1360         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1361                 /* 24 bit */
1362                 c.r = vc->vc_par[i + 1];
1363                 c.g = vc->vc_par[i + 2];
1364                 c.b = vc->vc_par[i + 3];
1365                 i += 3;
1366         } else
1367                 return i;
1368
1369         set_color(vc, &c);
1370
1371         return i;
1372 }
1373
1374 /* console_lock is held */
1375 static void csi_m(struct vc_data *vc)
1376 {
1377         int i;
1378
1379         for (i = 0; i <= vc->vc_npar; i++)
1380                 switch (vc->vc_par[i]) {
1381                 case 0: /* all attributes off */
1382                         default_attr(vc);
1383                         break;
1384                 case 1:
1385                         vc->vc_intensity = 2;
1386                         break;
1387                 case 2:
1388                         vc->vc_intensity = 0;
1389                         break;
1390                 case 3:
1391                         vc->vc_italic = 1;
1392                         break;
1393                 case 21:
1394                         /*
1395                          * No console drivers support double underline, so
1396                          * convert it to a single underline.
1397                          */
1398                 case 4:
1399                         vc->vc_underline = 1;
1400                         break;
1401                 case 5:
1402                         vc->vc_blink = 1;
1403                         break;
1404                 case 7:
1405                         vc->vc_reverse = 1;
1406                         break;
1407                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1408                           * Select primary font, don't display control chars if
1409                           * defined, don't set bit 8 on output.
1410                           */
1411                         vc->vc_translate = set_translate(vc->vc_charset == 0
1412                                         ? vc->vc_G0_charset
1413                                         : vc->vc_G1_charset, vc);
1414                         vc->vc_disp_ctrl = 0;
1415                         vc->vc_toggle_meta = 0;
1416                         break;
1417                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1418                           * Select first alternate font, lets chars < 32 be
1419                           * displayed as ROM chars.
1420                           */
1421                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1422                         vc->vc_disp_ctrl = 1;
1423                         vc->vc_toggle_meta = 0;
1424                         break;
1425                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1426                           * Select second alternate font, toggle high bit
1427                           * before displaying as ROM char.
1428                           */
1429                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1430                         vc->vc_disp_ctrl = 1;
1431                         vc->vc_toggle_meta = 1;
1432                         break;
1433                 case 22:
1434                         vc->vc_intensity = 1;
1435                         break;
1436                 case 23:
1437                         vc->vc_italic = 0;
1438                         break;
1439                 case 24:
1440                         vc->vc_underline = 0;
1441                         break;
1442                 case 25:
1443                         vc->vc_blink = 0;
1444                         break;
1445                 case 27:
1446                         vc->vc_reverse = 0;
1447                         break;
1448                 case 38:
1449                         i = vc_t416_color(vc, i, rgb_foreground);
1450                         break;
1451                 case 48:
1452                         i = vc_t416_color(vc, i, rgb_background);
1453                         break;
1454                 case 39:
1455                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1456                                 (vc->vc_color & 0xf0);
1457                         break;
1458                 case 49:
1459                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1460                                 (vc->vc_color & 0x0f);
1461                         break;
1462                 default:
1463                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1464                                 if (vc->vc_par[i] < 100)
1465                                         vc->vc_intensity = 2;
1466                                 vc->vc_par[i] -= 60;
1467                         }
1468                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1469                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1470                                         | (vc->vc_color & 0xf0);
1471                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1472                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1473                                         | (vc->vc_color & 0x0f);
1474                         break;
1475                 }
1476         update_attr(vc);
1477 }
1478
1479 static void respond_string(const char *p, struct tty_port *port)
1480 {
1481         while (*p) {
1482                 tty_insert_flip_char(port, *p, 0);
1483                 p++;
1484         }
1485         tty_schedule_flip(port);
1486 }
1487
1488 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1489 {
1490         char buf[40];
1491
1492         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1493         respond_string(buf, tty->port);
1494 }
1495
1496 static inline void status_report(struct tty_struct *tty)
1497 {
1498         respond_string("\033[0n", tty->port);   /* Terminal ok */
1499 }
1500
1501 static inline void respond_ID(struct tty_struct *tty)
1502 {
1503         respond_string(VT102ID, tty->port);
1504 }
1505
1506 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1507 {
1508         char buf[8];
1509
1510         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1511                 (char)('!' + mry));
1512         respond_string(buf, tty->port);
1513 }
1514
1515 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1516 int mouse_reporting(void)
1517 {
1518         return vc_cons[fg_console].d->vc_report_mouse;
1519 }
1520
1521 /* console_lock is held */
1522 static void set_mode(struct vc_data *vc, int on_off)
1523 {
1524         int i;
1525
1526         for (i = 0; i <= vc->vc_npar; i++)
1527                 if (vc->vc_ques) {
1528                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1529                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1530                                 if (on_off)
1531                                         set_kbd(vc, decckm);
1532                                 else
1533                                         clr_kbd(vc, decckm);
1534                                 break;
1535                         case 3: /* 80/132 mode switch unimplemented */
1536 #if 0
1537                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1538                                 /* this alone does not suffice; some user mode
1539                                    utility has to change the hardware regs */
1540 #endif
1541                                 break;
1542                         case 5:                 /* Inverted screen on/off */
1543                                 if (vc->vc_decscnm != on_off) {
1544                                         vc->vc_decscnm = on_off;
1545                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1546                                         update_attr(vc);
1547                                 }
1548                                 break;
1549                         case 6:                 /* Origin relative/absolute */
1550                                 vc->vc_decom = on_off;
1551                                 gotoxay(vc, 0, 0);
1552                                 break;
1553                         case 7:                 /* Autowrap on/off */
1554                                 vc->vc_decawm = on_off;
1555                                 break;
1556                         case 8:                 /* Autorepeat on/off */
1557                                 if (on_off)
1558                                         set_kbd(vc, decarm);
1559                                 else
1560                                         clr_kbd(vc, decarm);
1561                                 break;
1562                         case 9:
1563                                 vc->vc_report_mouse = on_off ? 1 : 0;
1564                                 break;
1565                         case 25:                /* Cursor on/off */
1566                                 vc->vc_deccm = on_off;
1567                                 break;
1568                         case 1000:
1569                                 vc->vc_report_mouse = on_off ? 2 : 0;
1570                                 break;
1571                         }
1572                 } else {
1573                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1574                         case 3:                 /* Monitor (display ctrls) */
1575                                 vc->vc_disp_ctrl = on_off;
1576                                 break;
1577                         case 4:                 /* Insert Mode on/off */
1578                                 vc->vc_decim = on_off;
1579                                 break;
1580                         case 20:                /* Lf, Enter == CrLf/Lf */
1581                                 if (on_off)
1582                                         set_kbd(vc, lnm);
1583                                 else
1584                                         clr_kbd(vc, lnm);
1585                                 break;
1586                         }
1587                 }
1588 }
1589
1590 /* console_lock is held */
1591 static void setterm_command(struct vc_data *vc)
1592 {
1593         switch(vc->vc_par[0]) {
1594                 case 1: /* set color for underline mode */
1595                         if (vc->vc_can_do_color &&
1596                                         vc->vc_par[1] < 16) {
1597                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1598                                 if (vc->vc_underline)
1599                                         update_attr(vc);
1600                         }
1601                         break;
1602                 case 2: /* set color for half intensity mode */
1603                         if (vc->vc_can_do_color &&
1604                                         vc->vc_par[1] < 16) {
1605                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1606                                 if (vc->vc_intensity == 0)
1607                                         update_attr(vc);
1608                         }
1609                         break;
1610                 case 8: /* store colors as defaults */
1611                         vc->vc_def_color = vc->vc_attr;
1612                         if (vc->vc_hi_font_mask == 0x100)
1613                                 vc->vc_def_color >>= 1;
1614                         default_attr(vc);
1615                         update_attr(vc);
1616                         break;
1617                 case 9: /* set blanking interval */
1618                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1619                         poke_blanked_console();
1620                         break;
1621                 case 10: /* set bell frequency in Hz */
1622                         if (vc->vc_npar >= 1)
1623                                 vc->vc_bell_pitch = vc->vc_par[1];
1624                         else
1625                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1626                         break;
1627                 case 11: /* set bell duration in msec */
1628                         if (vc->vc_npar >= 1)
1629                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1630                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1631                         else
1632                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1633                         break;
1634                 case 12: /* bring specified console to the front */
1635                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1636                                 set_console(vc->vc_par[1] - 1);
1637                         break;
1638                 case 13: /* unblank the screen */
1639                         poke_blanked_console();
1640                         break;
1641                 case 14: /* set vesa powerdown interval */
1642                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1643                         break;
1644                 case 15: /* activate the previous console */
1645                         set_console(last_console);
1646                         break;
1647                 case 16: /* set cursor blink duration in msec */
1648                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1649                                         vc->vc_par[1] <= USHRT_MAX)
1650                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1651                         else
1652                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1653                         break;
1654         }
1655 }
1656
1657 /* console_lock is held */
1658 static void csi_at(struct vc_data *vc, unsigned int nr)
1659 {
1660         if (nr > vc->vc_cols - vc->vc_x)
1661                 nr = vc->vc_cols - vc->vc_x;
1662         else if (!nr)
1663                 nr = 1;
1664         insert_char(vc, nr);
1665 }
1666
1667 /* console_lock is held */
1668 static void csi_L(struct vc_data *vc, unsigned int nr)
1669 {
1670         if (nr > vc->vc_rows - vc->vc_y)
1671                 nr = vc->vc_rows - vc->vc_y;
1672         else if (!nr)
1673                 nr = 1;
1674         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1675         vc->vc_need_wrap = 0;
1676 }
1677
1678 /* console_lock is held */
1679 static void csi_P(struct vc_data *vc, unsigned int nr)
1680 {
1681         if (nr > vc->vc_cols - vc->vc_x)
1682                 nr = vc->vc_cols - vc->vc_x;
1683         else if (!nr)
1684                 nr = 1;
1685         delete_char(vc, nr);
1686 }
1687
1688 /* console_lock is held */
1689 static void csi_M(struct vc_data *vc, unsigned int nr)
1690 {
1691         if (nr > vc->vc_rows - vc->vc_y)
1692                 nr = vc->vc_rows - vc->vc_y;
1693         else if (!nr)
1694                 nr=1;
1695         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1696         vc->vc_need_wrap = 0;
1697 }
1698
1699 /* console_lock is held (except via vc_init->reset_terminal */
1700 static void save_cur(struct vc_data *vc)
1701 {
1702         vc->vc_saved_x          = vc->vc_x;
1703         vc->vc_saved_y          = vc->vc_y;
1704         vc->vc_s_intensity      = vc->vc_intensity;
1705         vc->vc_s_italic         = vc->vc_italic;
1706         vc->vc_s_underline      = vc->vc_underline;
1707         vc->vc_s_blink          = vc->vc_blink;
1708         vc->vc_s_reverse        = vc->vc_reverse;
1709         vc->vc_s_charset        = vc->vc_charset;
1710         vc->vc_s_color          = vc->vc_color;
1711         vc->vc_saved_G0         = vc->vc_G0_charset;
1712         vc->vc_saved_G1         = vc->vc_G1_charset;
1713 }
1714
1715 /* console_lock is held */
1716 static void restore_cur(struct vc_data *vc)
1717 {
1718         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1719         vc->vc_intensity        = vc->vc_s_intensity;
1720         vc->vc_italic           = vc->vc_s_italic;
1721         vc->vc_underline        = vc->vc_s_underline;
1722         vc->vc_blink            = vc->vc_s_blink;
1723         vc->vc_reverse          = vc->vc_s_reverse;
1724         vc->vc_charset          = vc->vc_s_charset;
1725         vc->vc_color            = vc->vc_s_color;
1726         vc->vc_G0_charset       = vc->vc_saved_G0;
1727         vc->vc_G1_charset       = vc->vc_saved_G1;
1728         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1729         update_attr(vc);
1730         vc->vc_need_wrap = 0;
1731 }
1732
1733 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1734         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1735         ESpalette, ESosc };
1736
1737 /* console_lock is held (except via vc_init()) */
1738 static void reset_terminal(struct vc_data *vc, int do_clear)
1739 {
1740         vc->vc_top              = 0;
1741         vc->vc_bottom           = vc->vc_rows;
1742         vc->vc_state            = ESnormal;
1743         vc->vc_ques             = 0;
1744         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1745         vc->vc_G0_charset       = LAT1_MAP;
1746         vc->vc_G1_charset       = GRAF_MAP;
1747         vc->vc_charset          = 0;
1748         vc->vc_need_wrap        = 0;
1749         vc->vc_report_mouse     = 0;
1750         vc->vc_utf              = default_utf8;
1751         vc->vc_utf_count        = 0;
1752
1753         vc->vc_disp_ctrl        = 0;
1754         vc->vc_toggle_meta      = 0;
1755
1756         vc->vc_decscnm          = 0;
1757         vc->vc_decom            = 0;
1758         vc->vc_decawm           = 1;
1759         vc->vc_deccm            = global_cursor_default;
1760         vc->vc_decim            = 0;
1761
1762         vt_reset_keyboard(vc->vc_num);
1763
1764         vc->vc_cursor_type = cur_default;
1765         vc->vc_complement_mask = vc->vc_s_complement_mask;
1766
1767         default_attr(vc);
1768         update_attr(vc);
1769
1770         vc->vc_tab_stop[0]      =
1771         vc->vc_tab_stop[1]      =
1772         vc->vc_tab_stop[2]      =
1773         vc->vc_tab_stop[3]      =
1774         vc->vc_tab_stop[4]      =
1775         vc->vc_tab_stop[5]      =
1776         vc->vc_tab_stop[6]      =
1777         vc->vc_tab_stop[7]      = 0x01010101;
1778
1779         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1780         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1781         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1782
1783         gotoxy(vc, 0, 0);
1784         save_cur(vc);
1785         if (do_clear)
1786             csi_J(vc, 2);
1787 }
1788
1789 /* console_lock is held */
1790 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1791 {
1792         /*
1793          *  Control characters can be used in the _middle_
1794          *  of an escape sequence.
1795          */
1796         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1797                 return;
1798         switch (c) {
1799         case 0:
1800                 return;
1801         case 7:
1802                 if (vc->vc_state == ESosc)
1803                         vc->vc_state = ESnormal;
1804                 else if (vc->vc_bell_duration)
1805                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1806                 return;
1807         case 8:
1808                 bs(vc);
1809                 return;
1810         case 9:
1811                 vc->vc_pos -= (vc->vc_x << 1);
1812                 while (vc->vc_x < vc->vc_cols - 1) {
1813                         vc->vc_x++;
1814                         if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1815                                 break;
1816                 }
1817                 vc->vc_pos += (vc->vc_x << 1);
1818                 notify_write(vc, '\t');
1819                 return;
1820         case 10: case 11: case 12:
1821                 lf(vc);
1822                 if (!is_kbd(vc, lnm))
1823                         return;
1824         case 13:
1825                 cr(vc);
1826                 return;
1827         case 14:
1828                 vc->vc_charset = 1;
1829                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1830                 vc->vc_disp_ctrl = 1;
1831                 return;
1832         case 15:
1833                 vc->vc_charset = 0;
1834                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1835                 vc->vc_disp_ctrl = 0;
1836                 return;
1837         case 24: case 26:
1838                 vc->vc_state = ESnormal;
1839                 return;
1840         case 27:
1841                 vc->vc_state = ESesc;
1842                 return;
1843         case 127:
1844                 del(vc);
1845                 return;
1846         case 128+27:
1847                 vc->vc_state = ESsquare;
1848                 return;
1849         }
1850         switch(vc->vc_state) {
1851         case ESesc:
1852                 vc->vc_state = ESnormal;
1853                 switch (c) {
1854                 case '[':
1855                         vc->vc_state = ESsquare;
1856                         return;
1857                 case ']':
1858                         vc->vc_state = ESnonstd;
1859                         return;
1860                 case '%':
1861                         vc->vc_state = ESpercent;
1862                         return;
1863                 case 'E':
1864                         cr(vc);
1865                         lf(vc);
1866                         return;
1867                 case 'M':
1868                         ri(vc);
1869                         return;
1870                 case 'D':
1871                         lf(vc);
1872                         return;
1873                 case 'H':
1874                         vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1875                         return;
1876                 case 'Z':
1877                         respond_ID(tty);
1878                         return;
1879                 case '7':
1880                         save_cur(vc);
1881                         return;
1882                 case '8':
1883                         restore_cur(vc);
1884                         return;
1885                 case '(':
1886                         vc->vc_state = ESsetG0;
1887                         return;
1888                 case ')':
1889                         vc->vc_state = ESsetG1;
1890                         return;
1891                 case '#':
1892                         vc->vc_state = EShash;
1893                         return;
1894                 case 'c':
1895                         reset_terminal(vc, 1);
1896                         return;
1897                 case '>':  /* Numeric keypad */
1898                         clr_kbd(vc, kbdapplic);
1899                         return;
1900                 case '=':  /* Appl. keypad */
1901                         set_kbd(vc, kbdapplic);
1902                         return;
1903                 }
1904                 return;
1905         case ESnonstd:
1906                 if (c=='P') {   /* palette escape sequence */
1907                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1908                                 vc->vc_par[vc->vc_npar] = 0;
1909                         vc->vc_npar = 0;
1910                         vc->vc_state = ESpalette;
1911                         return;
1912                 } else if (c=='R') {   /* reset palette */
1913                         reset_palette(vc);
1914                         vc->vc_state = ESnormal;
1915                 } else if (c>='0' && c<='9')
1916                         vc->vc_state = ESosc;
1917                 else
1918                         vc->vc_state = ESnormal;
1919                 return;
1920         case ESpalette:
1921                 if (isxdigit(c)) {
1922                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1923                         if (vc->vc_npar == 7) {
1924                                 int i = vc->vc_par[0] * 3, j = 1;
1925                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1926                                 vc->vc_palette[i++] += vc->vc_par[j++];
1927                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1928                                 vc->vc_palette[i++] += vc->vc_par[j++];
1929                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1930                                 vc->vc_palette[i] += vc->vc_par[j];
1931                                 set_palette(vc);
1932                                 vc->vc_state = ESnormal;
1933                         }
1934                 } else
1935                         vc->vc_state = ESnormal;
1936                 return;
1937         case ESsquare:
1938                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1939                         vc->vc_par[vc->vc_npar] = 0;
1940                 vc->vc_npar = 0;
1941                 vc->vc_state = ESgetpars;
1942                 if (c == '[') { /* Function key */
1943                         vc->vc_state=ESfunckey;
1944                         return;
1945                 }
1946                 vc->vc_ques = (c == '?');
1947                 if (vc->vc_ques)
1948                         return;
1949         case ESgetpars:
1950                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1951                         vc->vc_npar++;
1952                         return;
1953                 } else if (c>='0' && c<='9') {
1954                         vc->vc_par[vc->vc_npar] *= 10;
1955                         vc->vc_par[vc->vc_npar] += c - '0';
1956                         return;
1957                 }
1958                 vc->vc_state = ESnormal;
1959                 switch(c) {
1960                 case 'h':
1961                         set_mode(vc, 1);
1962                         return;
1963                 case 'l':
1964                         set_mode(vc, 0);
1965                         return;
1966                 case 'c':
1967                         if (vc->vc_ques) {
1968                                 if (vc->vc_par[0])
1969                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1970                                 else
1971                                         vc->vc_cursor_type = cur_default;
1972                                 return;
1973                         }
1974                         break;
1975                 case 'm':
1976                         if (vc->vc_ques) {
1977                                 clear_selection();
1978                                 if (vc->vc_par[0])
1979                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1980                                 else
1981                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1982                                 return;
1983                         }
1984                         break;
1985                 case 'n':
1986                         if (!vc->vc_ques) {
1987                                 if (vc->vc_par[0] == 5)
1988                                         status_report(tty);
1989                                 else if (vc->vc_par[0] == 6)
1990                                         cursor_report(vc, tty);
1991                         }
1992                         return;
1993                 }
1994                 if (vc->vc_ques) {
1995                         vc->vc_ques = 0;
1996                         return;
1997                 }
1998                 switch(c) {
1999                 case 'G': case '`':
2000                         if (vc->vc_par[0])
2001                                 vc->vc_par[0]--;
2002                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
2003                         return;
2004                 case 'A':
2005                         if (!vc->vc_par[0])
2006                                 vc->vc_par[0]++;
2007                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2008                         return;
2009                 case 'B': case 'e':
2010                         if (!vc->vc_par[0])
2011                                 vc->vc_par[0]++;
2012                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2013                         return;
2014                 case 'C': case 'a':
2015                         if (!vc->vc_par[0])
2016                                 vc->vc_par[0]++;
2017                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2018                         return;
2019                 case 'D':
2020                         if (!vc->vc_par[0])
2021                                 vc->vc_par[0]++;
2022                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2023                         return;
2024                 case 'E':
2025                         if (!vc->vc_par[0])
2026                                 vc->vc_par[0]++;
2027                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2028                         return;
2029                 case 'F':
2030                         if (!vc->vc_par[0])
2031                                 vc->vc_par[0]++;
2032                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2033                         return;
2034                 case 'd':
2035                         if (vc->vc_par[0])
2036                                 vc->vc_par[0]--;
2037                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2038                         return;
2039                 case 'H': case 'f':
2040                         if (vc->vc_par[0])
2041                                 vc->vc_par[0]--;
2042                         if (vc->vc_par[1])
2043                                 vc->vc_par[1]--;
2044                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2045                         return;
2046                 case 'J':
2047                         csi_J(vc, vc->vc_par[0]);
2048                         return;
2049                 case 'K':
2050                         csi_K(vc, vc->vc_par[0]);
2051                         return;
2052                 case 'L':
2053                         csi_L(vc, vc->vc_par[0]);
2054                         return;
2055                 case 'M':
2056                         csi_M(vc, vc->vc_par[0]);
2057                         return;
2058                 case 'P':
2059                         csi_P(vc, vc->vc_par[0]);
2060                         return;
2061                 case 'c':
2062                         if (!vc->vc_par[0])
2063                                 respond_ID(tty);
2064                         return;
2065                 case 'g':
2066                         if (!vc->vc_par[0])
2067                                 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2068                         else if (vc->vc_par[0] == 3) {
2069                                 vc->vc_tab_stop[0] =
2070                                         vc->vc_tab_stop[1] =
2071                                         vc->vc_tab_stop[2] =
2072                                         vc->vc_tab_stop[3] =
2073                                         vc->vc_tab_stop[4] =
2074                                         vc->vc_tab_stop[5] =
2075                                         vc->vc_tab_stop[6] =
2076                                         vc->vc_tab_stop[7] = 0;
2077                         }
2078                         return;
2079                 case 'm':
2080                         csi_m(vc);
2081                         return;
2082                 case 'q': /* DECLL - but only 3 leds */
2083                         /* map 0,1,2,3 to 0,1,2,4 */
2084                         if (vc->vc_par[0] < 4)
2085                                 vt_set_led_state(vc->vc_num,
2086                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2087                         return;
2088                 case 'r':
2089                         if (!vc->vc_par[0])
2090                                 vc->vc_par[0]++;
2091                         if (!vc->vc_par[1])
2092                                 vc->vc_par[1] = vc->vc_rows;
2093                         /* Minimum allowed region is 2 lines */
2094                         if (vc->vc_par[0] < vc->vc_par[1] &&
2095                             vc->vc_par[1] <= vc->vc_rows) {
2096                                 vc->vc_top = vc->vc_par[0] - 1;
2097                                 vc->vc_bottom = vc->vc_par[1];
2098                                 gotoxay(vc, 0, 0);
2099                         }
2100                         return;
2101                 case 's':
2102                         save_cur(vc);
2103                         return;
2104                 case 'u':
2105                         restore_cur(vc);
2106                         return;
2107                 case 'X':
2108                         csi_X(vc, vc->vc_par[0]);
2109                         return;
2110                 case '@':
2111                         csi_at(vc, vc->vc_par[0]);
2112                         return;
2113                 case ']': /* setterm functions */
2114                         setterm_command(vc);
2115                         return;
2116                 }
2117                 return;
2118         case ESpercent:
2119                 vc->vc_state = ESnormal;
2120                 switch (c) {
2121                 case '@':  /* defined in ISO 2022 */
2122                         vc->vc_utf = 0;
2123                         return;
2124                 case 'G':  /* prelim official escape code */
2125                 case '8':  /* retained for compatibility */
2126                         vc->vc_utf = 1;
2127                         return;
2128                 }
2129                 return;
2130         case ESfunckey:
2131                 vc->vc_state = ESnormal;
2132                 return;
2133         case EShash:
2134                 vc->vc_state = ESnormal;
2135                 if (c == '8') {
2136                         /* DEC screen alignment test. kludge :-) */
2137                         vc->vc_video_erase_char =
2138                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2139                         csi_J(vc, 2);
2140                         vc->vc_video_erase_char =
2141                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2142                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2143                 }
2144                 return;
2145         case ESsetG0:
2146                 if (c == '0')
2147                         vc->vc_G0_charset = GRAF_MAP;
2148                 else if (c == 'B')
2149                         vc->vc_G0_charset = LAT1_MAP;
2150                 else if (c == 'U')
2151                         vc->vc_G0_charset = IBMPC_MAP;
2152                 else if (c == 'K')
2153                         vc->vc_G0_charset = USER_MAP;
2154                 if (vc->vc_charset == 0)
2155                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2156                 vc->vc_state = ESnormal;
2157                 return;
2158         case ESsetG1:
2159                 if (c == '0')
2160                         vc->vc_G1_charset = GRAF_MAP;
2161                 else if (c == 'B')
2162                         vc->vc_G1_charset = LAT1_MAP;
2163                 else if (c == 'U')
2164                         vc->vc_G1_charset = IBMPC_MAP;
2165                 else if (c == 'K')
2166                         vc->vc_G1_charset = USER_MAP;
2167                 if (vc->vc_charset == 1)
2168                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2169                 vc->vc_state = ESnormal;
2170                 return;
2171         case ESosc:
2172                 return;
2173         default:
2174                 vc->vc_state = ESnormal;
2175         }
2176 }
2177
2178 /* is_double_width() is based on the wcwidth() implementation by
2179  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2180  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2181  */
2182 struct interval {
2183         uint32_t first;
2184         uint32_t last;
2185 };
2186
2187 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2188 {
2189         int min = 0;
2190         int mid;
2191
2192         if (ucs < table[0].first || ucs > table[max].last)
2193                 return 0;
2194         while (max >= min) {
2195                 mid = (min + max) / 2;
2196                 if (ucs > table[mid].last)
2197                         min = mid + 1;
2198                 else if (ucs < table[mid].first)
2199                         max = mid - 1;
2200                 else
2201                         return 1;
2202         }
2203         return 0;
2204 }
2205
2206 static int is_double_width(uint32_t ucs)
2207 {
2208         static const struct interval double_width[] = {
2209                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2210                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2211                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2212                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2213         };
2214         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2215 }
2216
2217 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2218                 unsigned long draw_to, int *draw_x)
2219 {
2220         if (*draw_x < 0)
2221                 return;
2222
2223         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2224                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2225         *draw_x = -1;
2226 }
2227
2228 /* acquires console_lock */
2229 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2230 {
2231         int c, tc, ok, n = 0, draw_x = -1;
2232         unsigned int currcons;
2233         unsigned long draw_from = 0, draw_to = 0;
2234         struct vc_data *vc;
2235         unsigned char vc_attr;
2236         struct vt_notifier_param param;
2237         uint8_t rescan;
2238         uint8_t inverse;
2239         uint8_t width;
2240         u16 himask, charmask;
2241
2242         if (in_interrupt())
2243                 return count;
2244
2245         might_sleep();
2246
2247         console_lock();
2248         vc = tty->driver_data;
2249         if (vc == NULL) {
2250                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2251                 console_unlock();
2252                 return 0;
2253         }
2254
2255         currcons = vc->vc_num;
2256         if (!vc_cons_allocated(currcons)) {
2257                 /* could this happen? */
2258                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2259                 console_unlock();
2260                 return 0;
2261         }
2262
2263         himask = vc->vc_hi_font_mask;
2264         charmask = himask ? 0x1ff : 0xff;
2265
2266         /* undraw cursor first */
2267         if (con_is_fg(vc))
2268                 hide_cursor(vc);
2269
2270         param.vc = vc;
2271
2272         while (!tty->stopped && count) {
2273                 int orig = *buf;
2274                 c = orig;
2275                 buf++;
2276                 n++;
2277                 count--;
2278                 rescan = 0;
2279                 inverse = 0;
2280                 width = 1;
2281
2282                 /* Do no translation at all in control states */
2283                 if (vc->vc_state != ESnormal) {
2284                         tc = c;
2285                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2286                     /* Combine UTF-8 into Unicode in vc_utf_char.
2287                      * vc_utf_count is the number of continuation bytes still
2288                      * expected to arrive.
2289                      * vc_npar is the number of continuation bytes arrived so
2290                      * far
2291                      */
2292 rescan_last_byte:
2293                     if ((c & 0xc0) == 0x80) {
2294                         /* Continuation byte received */
2295                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2296                         if (vc->vc_utf_count) {
2297                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2298                             vc->vc_npar++;
2299                             if (--vc->vc_utf_count) {
2300                                 /* Still need some bytes */
2301                                 continue;
2302                             }
2303                             /* Got a whole character */
2304                             c = vc->vc_utf_char;
2305                             /* Reject overlong sequences */
2306                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2307                                         c > utf8_length_changes[vc->vc_npar])
2308                                 c = 0xfffd;
2309                         } else {
2310                             /* Unexpected continuation byte */
2311                             vc->vc_utf_count = 0;
2312                             c = 0xfffd;
2313                         }
2314                     } else {
2315                         /* Single ASCII byte or first byte of a sequence received */
2316                         if (vc->vc_utf_count) {
2317                             /* Continuation byte expected */
2318                             rescan = 1;
2319                             vc->vc_utf_count = 0;
2320                             c = 0xfffd;
2321                         } else if (c > 0x7f) {
2322                             /* First byte of a multibyte sequence received */
2323                             vc->vc_npar = 0;
2324                             if ((c & 0xe0) == 0xc0) {
2325                                 vc->vc_utf_count = 1;
2326                                 vc->vc_utf_char = (c & 0x1f);
2327                             } else if ((c & 0xf0) == 0xe0) {
2328                                 vc->vc_utf_count = 2;
2329                                 vc->vc_utf_char = (c & 0x0f);
2330                             } else if ((c & 0xf8) == 0xf0) {
2331                                 vc->vc_utf_count = 3;
2332                                 vc->vc_utf_char = (c & 0x07);
2333                             } else if ((c & 0xfc) == 0xf8) {
2334                                 vc->vc_utf_count = 4;
2335                                 vc->vc_utf_char = (c & 0x03);
2336                             } else if ((c & 0xfe) == 0xfc) {
2337                                 vc->vc_utf_count = 5;
2338                                 vc->vc_utf_char = (c & 0x01);
2339                             } else {
2340                                 /* 254 and 255 are invalid */
2341                                 c = 0xfffd;
2342                             }
2343                             if (vc->vc_utf_count) {
2344                                 /* Still need some bytes */
2345                                 continue;
2346                             }
2347                         }
2348                         /* Nothing to do if an ASCII byte was received */
2349                     }
2350                     /* End of UTF-8 decoding. */
2351                     /* c is the received character, or U+FFFD for invalid sequences. */
2352                     /* Replace invalid Unicode code points with U+FFFD too */
2353                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2354                         c = 0xfffd;
2355                     tc = c;
2356                 } else {        /* no utf or alternate charset mode */
2357                     tc = vc_translate(vc, c);
2358                 }
2359
2360                 param.c = tc;
2361                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2362                                         &param) == NOTIFY_STOP)
2363                         continue;
2364
2365                 /* If the original code was a control character we
2366                  * only allow a glyph to be displayed if the code is
2367                  * not normally used (such as for cursor movement) or
2368                  * if the disp_ctrl mode has been explicitly enabled.
2369                  * Certain characters (as given by the CTRL_ALWAYS
2370                  * bitmap) are always displayed as control characters,
2371                  * as the console would be pretty useless without
2372                  * them; to display an arbitrary font position use the
2373                  * direct-to-font zone in UTF-8 mode.
2374                  */
2375                 ok = tc && (c >= 32 ||
2376                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2377                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2378                         && (c != 127 || vc->vc_disp_ctrl)
2379                         && (c != 128+27);
2380
2381                 if (vc->vc_state == ESnormal && ok) {
2382                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2383                                 if (is_double_width(c))
2384                                         width = 2;
2385                         }
2386                         /* Now try to find out how to display it */
2387                         tc = conv_uni_to_pc(vc, tc);
2388                         if (tc & ~charmask) {
2389                                 if (tc == -1 || tc == -2) {
2390                                     continue; /* nothing to display */
2391                                 }
2392                                 /* Glyph not found */
2393                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2394                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2395                                        This would make absolutely no sense with Unicode in mind,
2396                                        but do this for ASCII characters since a font may lack
2397                                        Unicode mapping info and we don't want to end up with
2398                                        having question marks only. */
2399                                     tc = c;
2400                                 } else {
2401                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2402                                     tc = conv_uni_to_pc(vc, 0xfffd);
2403                                     if (tc < 0) {
2404                                         inverse = 1;
2405                                         tc = conv_uni_to_pc(vc, '?');
2406                                         if (tc < 0) tc = '?';
2407                                     }
2408                                 }
2409                         }
2410
2411                         if (!inverse) {
2412                                 vc_attr = vc->vc_attr;
2413                         } else {
2414                                 /* invert vc_attr */
2415                                 if (!vc->vc_can_do_color) {
2416                                         vc_attr = (vc->vc_attr) ^ 0x08;
2417                                 } else if (vc->vc_hi_font_mask == 0x100) {
2418                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2419                                 } else {
2420                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2421                                 }
2422                                 con_flush(vc, draw_from, draw_to, &draw_x);
2423                         }
2424
2425                         while (1) {
2426                                 if (vc->vc_need_wrap || vc->vc_decim)
2427                                         con_flush(vc, draw_from, draw_to,
2428                                                         &draw_x);
2429                                 if (vc->vc_need_wrap) {
2430                                         cr(vc);
2431                                         lf(vc);
2432                                 }
2433                                 if (vc->vc_decim)
2434                                         insert_char(vc, 1);
2435                                 scr_writew(himask ?
2436                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2437                                              (vc_attr << 8) + tc,
2438                                            (u16 *) vc->vc_pos);
2439                                 if (con_should_update(vc) && draw_x < 0) {
2440                                         draw_x = vc->vc_x;
2441                                         draw_from = vc->vc_pos;
2442                                 }
2443                                 if (vc->vc_x == vc->vc_cols - 1) {
2444                                         vc->vc_need_wrap = vc->vc_decawm;
2445                                         draw_to = vc->vc_pos + 2;
2446                                 } else {
2447                                         vc->vc_x++;
2448                                         draw_to = (vc->vc_pos += 2);
2449                                 }
2450
2451                                 if (!--width) break;
2452
2453                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2454                                 if (tc < 0) tc = ' ';
2455                         }
2456                         notify_write(vc, c);
2457
2458                         if (inverse)
2459                                 con_flush(vc, draw_from, draw_to, &draw_x);
2460
2461                         if (rescan) {
2462                                 rescan = 0;
2463                                 inverse = 0;
2464                                 width = 1;
2465                                 c = orig;
2466                                 goto rescan_last_byte;
2467                         }
2468                         continue;
2469                 }
2470                 con_flush(vc, draw_from, draw_to, &draw_x);
2471                 do_con_trol(tty, vc, orig);
2472         }
2473         con_flush(vc, draw_from, draw_to, &draw_x);
2474         console_conditional_schedule();
2475         notify_update(vc);
2476         console_unlock();
2477         return n;
2478 }
2479
2480 /*
2481  * This is the console switching callback.
2482  *
2483  * Doing console switching in a process context allows
2484  * us to do the switches asynchronously (needed when we want
2485  * to switch due to a keyboard interrupt).  Synchronization
2486  * with other console code and prevention of re-entrancy is
2487  * ensured with console_lock.
2488  */
2489 static void console_callback(struct work_struct *ignored)
2490 {
2491         console_lock();
2492
2493         if (want_console >= 0) {
2494                 if (want_console != fg_console &&
2495                     vc_cons_allocated(want_console)) {
2496                         hide_cursor(vc_cons[fg_console].d);
2497                         change_console(vc_cons[want_console].d);
2498                         /* we only changed when the console had already
2499                            been allocated - a new console is not created
2500                            in an interrupt routine */
2501                 }
2502                 want_console = -1;
2503         }
2504         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2505                 do_poke_blanked_console = 0;
2506                 poke_blanked_console();
2507         }
2508         if (scrollback_delta) {
2509                 struct vc_data *vc = vc_cons[fg_console].d;
2510                 clear_selection();
2511                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2512                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2513                 scrollback_delta = 0;
2514         }
2515         if (blank_timer_expired) {
2516                 do_blank_screen(0);
2517                 blank_timer_expired = 0;
2518         }
2519         notify_update(vc_cons[fg_console].d);
2520
2521         console_unlock();
2522 }
2523
2524 int set_console(int nr)
2525 {
2526         struct vc_data *vc = vc_cons[fg_console].d;
2527
2528         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2529                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2530
2531                 /*
2532                  * Console switch will fail in console_callback() or
2533                  * change_console() so there is no point scheduling
2534                  * the callback
2535                  *
2536                  * Existing set_console() users don't check the return
2537                  * value so this shouldn't break anything
2538                  */
2539                 return -EINVAL;
2540         }
2541
2542         want_console = nr;
2543         schedule_console_callback();
2544
2545         return 0;
2546 }
2547
2548 struct tty_driver *console_driver;
2549
2550 #ifdef CONFIG_VT_CONSOLE
2551
2552 /**
2553  * vt_kmsg_redirect() - Sets/gets the kernel message console
2554  * @new:        The new virtual terminal number or -1 if the console should stay
2555  *              unchanged
2556  *
2557  * By default, the kernel messages are always printed on the current virtual
2558  * console. However, the user may modify that default with the
2559  * TIOCL_SETKMSGREDIRECT ioctl call.
2560  *
2561  * This function sets the kernel message console to be @new. It returns the old
2562  * virtual console number. The virtual terminal number 0 (both as parameter and
2563  * return value) means no redirection (i.e. always printed on the currently
2564  * active console).
2565  *
2566  * The parameter -1 means that only the current console is returned, but the
2567  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2568  * case to make the code more understandable.
2569  *
2570  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2571  * the parameter and always returns 0.
2572  */
2573 int vt_kmsg_redirect(int new)
2574 {
2575         static int kmsg_con;
2576
2577         if (new != -1)
2578                 return xchg(&kmsg_con, new);
2579         else
2580                 return kmsg_con;
2581 }
2582
2583 /*
2584  *      Console on virtual terminal
2585  *
2586  * The console must be locked when we get here.
2587  */
2588
2589 static void vt_console_print(struct console *co, const char *b, unsigned count)
2590 {
2591         struct vc_data *vc = vc_cons[fg_console].d;
2592         unsigned char c;
2593         static DEFINE_SPINLOCK(printing_lock);
2594         const ushort *start;
2595         ushort cnt = 0;
2596         ushort myx;
2597         int kmsg_console;
2598
2599         /* console busy or not yet initialized */
2600         if (!printable)
2601                 return;
2602         if (!spin_trylock(&printing_lock))
2603                 return;
2604
2605         kmsg_console = vt_get_kmsg_redirect();
2606         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2607                 vc = vc_cons[kmsg_console - 1].d;
2608
2609         /* read `x' only after setting currcons properly (otherwise
2610            the `x' macro will read the x of the foreground console). */
2611         myx = vc->vc_x;
2612
2613         if (!vc_cons_allocated(fg_console)) {
2614                 /* impossible */
2615                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2616                 goto quit;
2617         }
2618
2619         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2620                 goto quit;
2621
2622         /* undraw cursor first */
2623         if (con_is_fg(vc))
2624                 hide_cursor(vc);
2625
2626         start = (ushort *)vc->vc_pos;
2627
2628         /* Contrived structure to try to emulate original need_wrap behaviour
2629          * Problems caused when we have need_wrap set on '\n' character */
2630         while (count--) {
2631                 c = *b++;
2632                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2633                         if (cnt > 0) {
2634                                 if (con_is_visible(vc))
2635                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2636                                 vc->vc_x += cnt;
2637                                 if (vc->vc_need_wrap)
2638                                         vc->vc_x--;
2639                                 cnt = 0;
2640                         }
2641                         if (c == 8) {           /* backspace */
2642                                 bs(vc);
2643                                 start = (ushort *)vc->vc_pos;
2644                                 myx = vc->vc_x;
2645                                 continue;
2646                         }
2647                         if (c != 13)
2648                                 lf(vc);
2649                         cr(vc);
2650                         start = (ushort *)vc->vc_pos;
2651                         myx = vc->vc_x;
2652                         if (c == 10 || c == 13)
2653                                 continue;
2654                 }
2655                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2656                 notify_write(vc, c);
2657                 cnt++;
2658                 if (myx == vc->vc_cols - 1) {
2659                         vc->vc_need_wrap = 1;
2660                         continue;
2661                 }
2662                 vc->vc_pos += 2;
2663                 myx++;
2664         }
2665         if (cnt > 0) {
2666                 if (con_is_visible(vc))
2667                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2668                 vc->vc_x += cnt;
2669                 if (vc->vc_x == vc->vc_cols) {
2670                         vc->vc_x--;
2671                         vc->vc_need_wrap = 1;
2672                 }
2673         }
2674         set_cursor(vc);
2675         notify_update(vc);
2676
2677 quit:
2678         spin_unlock(&printing_lock);
2679 }
2680
2681 static struct tty_driver *vt_console_device(struct console *c, int *index)
2682 {
2683         *index = c->index ? c->index-1 : fg_console;
2684         return console_driver;
2685 }
2686
2687 static struct console vt_console_driver = {
2688         .name           = "tty",
2689         .write          = vt_console_print,
2690         .device         = vt_console_device,
2691         .unblank        = unblank_screen,
2692         .flags          = CON_PRINTBUFFER,
2693         .index          = -1,
2694 };
2695 #endif
2696
2697 /*
2698  *      Handling of Linux-specific VC ioctls
2699  */
2700
2701 /*
2702  * Generally a bit racy with respect to console_lock();.
2703  *
2704  * There are some functions which don't need it.
2705  *
2706  * There are some functions which can sleep for arbitrary periods
2707  * (paste_selection) but we don't need the lock there anyway.
2708  *
2709  * set_selection has locking, and definitely needs it
2710  */
2711
2712 int tioclinux(struct tty_struct *tty, unsigned long arg)
2713 {
2714         char type, data;
2715         char __user *p = (char __user *)arg;
2716         int lines;
2717         int ret;
2718
2719         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2720                 return -EPERM;
2721         if (get_user(type, p))
2722                 return -EFAULT;
2723         ret = 0;
2724
2725         switch (type)
2726         {
2727                 case TIOCL_SETSEL:
2728                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2729                         break;
2730                 case TIOCL_PASTESEL:
2731                         ret = paste_selection(tty);
2732                         break;
2733                 case TIOCL_UNBLANKSCREEN:
2734                         console_lock();
2735                         unblank_screen();
2736                         console_unlock();
2737                         break;
2738                 case TIOCL_SELLOADLUT:
2739                         console_lock();
2740                         ret = sel_loadlut(p);
2741                         console_unlock();
2742                         break;
2743                 case TIOCL_GETSHIFTSTATE:
2744
2745         /*
2746          * Make it possible to react to Shift+Mousebutton.
2747          * Note that 'shift_state' is an undocumented
2748          * kernel-internal variable; programs not closely
2749          * related to the kernel should not use this.
2750          */
2751                         data = vt_get_shift_state();
2752                         ret = put_user(data, p);
2753                         break;
2754                 case TIOCL_GETMOUSEREPORTING:
2755                         console_lock(); /* May be overkill */
2756                         data = mouse_reporting();
2757                         console_unlock();
2758                         ret = put_user(data, p);
2759                         break;
2760                 case TIOCL_SETVESABLANK:
2761                         console_lock();
2762                         ret = set_vesa_blanking(p);
2763                         console_unlock();
2764                         break;
2765                 case TIOCL_GETKMSGREDIRECT:
2766                         data = vt_get_kmsg_redirect();
2767                         ret = put_user(data, p);
2768                         break;
2769                 case TIOCL_SETKMSGREDIRECT:
2770                         if (!capable(CAP_SYS_ADMIN)) {
2771                                 ret = -EPERM;
2772                         } else {
2773                                 if (get_user(data, p+1))
2774                                         ret = -EFAULT;
2775                                 else
2776                                         vt_kmsg_redirect(data);
2777                         }
2778                         break;
2779                 case TIOCL_GETFGCONSOLE:
2780                         /* No locking needed as this is a transiently
2781                            correct return anyway if the caller hasn't
2782                            disabled switching */
2783                         ret = fg_console;
2784                         break;
2785                 case TIOCL_SCROLLCONSOLE:
2786                         if (get_user(lines, (s32 __user *)(p+4))) {
2787                                 ret = -EFAULT;
2788                         } else {
2789                                 /* Need the console lock here. Note that lots
2790                                    of other calls need fixing before the lock
2791                                    is actually useful ! */
2792                                 console_lock();
2793                                 scrollfront(vc_cons[fg_console].d, lines);
2794                                 console_unlock();
2795                                 ret = 0;
2796                         }
2797                         break;
2798                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2799                         console_lock();
2800                         ignore_poke = 1;
2801                         do_blank_screen(0);
2802                         console_unlock();
2803                         break;
2804                 case TIOCL_BLANKEDSCREEN:
2805                         ret = console_blanked;
2806                         break;
2807                 default:
2808                         ret = -EINVAL;
2809                         break;
2810         }
2811         return ret;
2812 }
2813
2814 /*
2815  * /dev/ttyN handling
2816  */
2817
2818 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2819 {
2820         int     retval;
2821
2822         retval = do_con_write(tty, buf, count);
2823         con_flush_chars(tty);
2824
2825         return retval;
2826 }
2827
2828 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2829 {
2830         if (in_interrupt())
2831                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2832         return do_con_write(tty, &ch, 1);
2833 }
2834
2835 static int con_write_room(struct tty_struct *tty)
2836 {
2837         if (tty->stopped)
2838                 return 0;
2839         return 32768;           /* No limit, really; we're not buffering */
2840 }
2841
2842 static int con_chars_in_buffer(struct tty_struct *tty)
2843 {
2844         return 0;               /* we're not buffering */
2845 }
2846
2847 /*
2848  * con_throttle and con_unthrottle are only used for
2849  * paste_selection(), which has to stuff in a large number of
2850  * characters...
2851  */
2852 static void con_throttle(struct tty_struct *tty)
2853 {
2854 }
2855
2856 static void con_unthrottle(struct tty_struct *tty)
2857 {
2858         struct vc_data *vc = tty->driver_data;
2859
2860         wake_up_interruptible(&vc->paste_wait);
2861 }
2862
2863 /*
2864  * Turn the Scroll-Lock LED on when the tty is stopped
2865  */
2866 static void con_stop(struct tty_struct *tty)
2867 {
2868         int console_num;
2869         if (!tty)
2870                 return;
2871         console_num = tty->index;
2872         if (!vc_cons_allocated(console_num))
2873                 return;
2874         vt_kbd_con_stop(console_num);
2875 }
2876
2877 /*
2878  * Turn the Scroll-Lock LED off when the console is started
2879  */
2880 static void con_start(struct tty_struct *tty)
2881 {
2882         int console_num;
2883         if (!tty)
2884                 return;
2885         console_num = tty->index;
2886         if (!vc_cons_allocated(console_num))
2887                 return;
2888         vt_kbd_con_start(console_num);
2889 }
2890
2891 static void con_flush_chars(struct tty_struct *tty)
2892 {
2893         struct vc_data *vc;
2894
2895         if (in_interrupt())     /* from flush_to_ldisc */
2896                 return;
2897
2898         /* if we race with con_close(), vt may be null */
2899         console_lock();
2900         vc = tty->driver_data;
2901         if (vc)
2902                 set_cursor(vc);
2903         console_unlock();
2904 }
2905
2906 /*
2907  * Allocate the console screen memory.
2908  */
2909 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2910 {
2911         unsigned int currcons = tty->index;
2912         struct vc_data *vc;
2913         int ret;
2914
2915         console_lock();
2916         ret = vc_allocate(currcons);
2917         if (ret)
2918                 goto unlock;
2919
2920         vc = vc_cons[currcons].d;
2921
2922         /* Still being freed */
2923         if (vc->port.tty) {
2924                 ret = -ERESTARTSYS;
2925                 goto unlock;
2926         }
2927
2928         ret = tty_port_install(&vc->port, driver, tty);
2929         if (ret)
2930                 goto unlock;
2931
2932         tty->driver_data = vc;
2933         vc->port.tty = tty;
2934         tty_port_get(&vc->port);
2935
2936         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2937                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2938                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2939         }
2940         if (vc->vc_utf)
2941                 tty->termios.c_iflag |= IUTF8;
2942         else
2943                 tty->termios.c_iflag &= ~IUTF8;
2944 unlock:
2945         console_unlock();
2946         return ret;
2947 }
2948
2949 static int con_open(struct tty_struct *tty, struct file *filp)
2950 {
2951         /* everything done in install */
2952         return 0;
2953 }
2954
2955
2956 static void con_close(struct tty_struct *tty, struct file *filp)
2957 {
2958         /* Nothing to do - we defer to shutdown */
2959 }
2960
2961 static void con_shutdown(struct tty_struct *tty)
2962 {
2963         struct vc_data *vc = tty->driver_data;
2964         BUG_ON(vc == NULL);
2965         console_lock();
2966         vc->port.tty = NULL;
2967         console_unlock();
2968 }
2969
2970 static void con_cleanup(struct tty_struct *tty)
2971 {
2972         struct vc_data *vc = tty->driver_data;
2973
2974         tty_port_put(&vc->port);
2975 }
2976
2977 static int default_color           = 7; /* white */
2978 static int default_italic_color    = 2; // green (ASCII)
2979 static int default_underline_color = 3; // cyan (ASCII)
2980 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2981 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2982 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2983
2984 static void vc_init(struct vc_data *vc, unsigned int rows,
2985                     unsigned int cols, int do_clear)
2986 {
2987         int j, k ;
2988
2989         vc->vc_cols = cols;
2990         vc->vc_rows = rows;
2991         vc->vc_size_row = cols << 1;
2992         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2993
2994         set_origin(vc);
2995         vc->vc_pos = vc->vc_origin;
2996         reset_vc(vc);
2997         for (j=k=0; j<16; j++) {
2998                 vc->vc_palette[k++] = default_red[j] ;
2999                 vc->vc_palette[k++] = default_grn[j] ;
3000                 vc->vc_palette[k++] = default_blu[j] ;
3001         }
3002         vc->vc_def_color       = default_color;
3003         vc->vc_ulcolor         = default_underline_color;
3004         vc->vc_itcolor         = default_italic_color;
3005         vc->vc_halfcolor       = 0x08;   /* grey */
3006         init_waitqueue_head(&vc->paste_wait);
3007         reset_terminal(vc, do_clear);
3008 }
3009
3010 /*
3011  * This routine initializes console interrupts, and does nothing
3012  * else. If you want the screen to clear, call tty_write with
3013  * the appropriate escape-sequence.
3014  */
3015
3016 static int __init con_init(void)
3017 {
3018         const char *display_desc = NULL;
3019         struct vc_data *vc;
3020         unsigned int currcons = 0, i;
3021
3022         console_lock();
3023
3024         if (conswitchp)
3025                 display_desc = conswitchp->con_startup();
3026         if (!display_desc) {
3027                 fg_console = 0;
3028                 console_unlock();
3029                 return 0;
3030         }
3031
3032         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3033                 struct con_driver *con_driver = &registered_con_driver[i];
3034
3035                 if (con_driver->con == NULL) {
3036                         con_driver->con = conswitchp;
3037                         con_driver->desc = display_desc;
3038                         con_driver->flag = CON_DRIVER_FLAG_INIT;
3039                         con_driver->first = 0;
3040                         con_driver->last = MAX_NR_CONSOLES - 1;
3041                         break;
3042                 }
3043         }
3044
3045         for (i = 0; i < MAX_NR_CONSOLES; i++)
3046                 con_driver_map[i] = conswitchp;
3047
3048         if (blankinterval) {
3049                 blank_state = blank_normal_wait;
3050                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3051         }
3052
3053         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3054                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3055                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3056                 tty_port_init(&vc->port);
3057                 visual_init(vc, currcons, 1);
3058                 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3059                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3060                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3061                         currcons || !vc->vc_sw->con_save_screen);
3062         }
3063         currcons = fg_console = 0;
3064         master_display_fg = vc = vc_cons[currcons].d;
3065         set_origin(vc);
3066         save_screen(vc);
3067         gotoxy(vc, vc->vc_x, vc->vc_y);
3068         csi_J(vc, 0);
3069         update_screen(vc);
3070         pr_info("Console: %s %s %dx%d\n",
3071                 vc->vc_can_do_color ? "colour" : "mono",
3072                 display_desc, vc->vc_cols, vc->vc_rows);
3073         printable = 1;
3074
3075         console_unlock();
3076
3077 #ifdef CONFIG_VT_CONSOLE
3078         register_console(&vt_console_driver);
3079 #endif
3080         return 0;
3081 }
3082 console_initcall(con_init);
3083
3084 static const struct tty_operations con_ops = {
3085         .install = con_install,
3086         .open = con_open,
3087         .close = con_close,
3088         .write = con_write,
3089         .write_room = con_write_room,
3090         .put_char = con_put_char,
3091         .flush_chars = con_flush_chars,
3092         .chars_in_buffer = con_chars_in_buffer,
3093         .ioctl = vt_ioctl,
3094 #ifdef CONFIG_COMPAT
3095         .compat_ioctl = vt_compat_ioctl,
3096 #endif
3097         .stop = con_stop,
3098         .start = con_start,
3099         .throttle = con_throttle,
3100         .unthrottle = con_unthrottle,
3101         .resize = vt_resize,
3102         .shutdown = con_shutdown,
3103         .cleanup = con_cleanup,
3104 };
3105
3106 static struct cdev vc0_cdev;
3107
3108 static ssize_t show_tty_active(struct device *dev,
3109                                 struct device_attribute *attr, char *buf)
3110 {
3111         return sprintf(buf, "tty%d\n", fg_console + 1);
3112 }
3113 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3114
3115 static struct attribute *vt_dev_attrs[] = {
3116         &dev_attr_active.attr,
3117         NULL
3118 };
3119
3120 ATTRIBUTE_GROUPS(vt_dev);
3121
3122 int __init vty_init(const struct file_operations *console_fops)
3123 {
3124         cdev_init(&vc0_cdev, console_fops);
3125         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3126             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3127                 panic("Couldn't register /dev/tty0 driver\n");
3128         tty0dev = device_create_with_groups(tty_class, NULL,
3129                                             MKDEV(TTY_MAJOR, 0), NULL,
3130                                             vt_dev_groups, "tty0");
3131         if (IS_ERR(tty0dev))
3132                 tty0dev = NULL;
3133
3134         vcs_init();
3135
3136         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3137         if (!console_driver)
3138                 panic("Couldn't allocate console driver\n");
3139
3140         console_driver->name = "tty";
3141         console_driver->name_base = 1;
3142         console_driver->major = TTY_MAJOR;
3143         console_driver->minor_start = 1;
3144         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3145         console_driver->init_termios = tty_std_termios;
3146         if (default_utf8)
3147                 console_driver->init_termios.c_iflag |= IUTF8;
3148         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3149         tty_set_operations(console_driver, &con_ops);
3150         if (tty_register_driver(console_driver))
3151                 panic("Couldn't register console driver\n");
3152         kbd_init();
3153         console_map_init();
3154 #ifdef CONFIG_MDA_CONSOLE
3155         mda_console_init();
3156 #endif
3157         return 0;
3158 }
3159
3160 #ifndef VT_SINGLE_DRIVER
3161
3162 static struct class *vtconsole_class;
3163
3164 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3165                            int deflt)
3166 {
3167         struct module *owner = csw->owner;
3168         const char *desc = NULL;
3169         struct con_driver *con_driver;
3170         int i, j = -1, k = -1, retval = -ENODEV;
3171
3172         if (!try_module_get(owner))
3173                 return -ENODEV;
3174
3175         WARN_CONSOLE_UNLOCKED();
3176
3177         /* check if driver is registered */
3178         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3179                 con_driver = &registered_con_driver[i];
3180
3181                 if (con_driver->con == csw) {
3182                         desc = con_driver->desc;
3183                         retval = 0;
3184                         break;
3185                 }
3186         }
3187
3188         if (retval)
3189                 goto err;
3190
3191         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3192                 csw->con_startup();
3193                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3194         }
3195
3196         if (deflt) {
3197                 if (conswitchp)
3198                         module_put(conswitchp->owner);
3199
3200                 __module_get(owner);
3201                 conswitchp = csw;
3202         }
3203
3204         first = max(first, con_driver->first);
3205         last = min(last, con_driver->last);
3206
3207         for (i = first; i <= last; i++) {
3208                 int old_was_color;
3209                 struct vc_data *vc = vc_cons[i].d;
3210
3211                 if (con_driver_map[i])
3212                         module_put(con_driver_map[i]->owner);
3213                 __module_get(owner);
3214                 con_driver_map[i] = csw;
3215
3216                 if (!vc || !vc->vc_sw)
3217                         continue;
3218
3219                 j = i;
3220
3221                 if (con_is_visible(vc)) {
3222                         k = i;
3223                         save_screen(vc);
3224                 }
3225
3226                 old_was_color = vc->vc_can_do_color;
3227                 vc->vc_sw->con_deinit(vc);
3228                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3229                 visual_init(vc, i, 0);
3230                 set_origin(vc);
3231                 update_attr(vc);
3232
3233                 /* If the console changed between mono <-> color, then
3234                  * the attributes in the screenbuf will be wrong.  The
3235                  * following resets all attributes to something sane.
3236                  */
3237                 if (old_was_color != vc->vc_can_do_color)
3238                         clear_buffer_attributes(vc);
3239         }
3240
3241         pr_info("Console: switching ");
3242         if (!deflt)
3243                 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
3244         if (j >= 0) {
3245                 struct vc_data *vc = vc_cons[j].d;
3246
3247                 printk(KERN_CONT "to %s %s %dx%d\n",
3248                        vc->vc_can_do_color ? "colour" : "mono",
3249                        desc, vc->vc_cols, vc->vc_rows);
3250
3251                 if (k >= 0) {
3252                         vc = vc_cons[k].d;
3253                         update_screen(vc);
3254                 }
3255         } else
3256                 printk(KERN_CONT "to %s\n", desc);
3257
3258         retval = 0;
3259 err:
3260         module_put(owner);
3261         return retval;
3262 };
3263
3264
3265 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3266 /* unlocked version of unbind_con_driver() */
3267 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3268 {
3269         struct module *owner = csw->owner;
3270         const struct consw *defcsw = NULL;
3271         struct con_driver *con_driver = NULL, *con_back = NULL;
3272         int i, retval = -ENODEV;
3273
3274         if (!try_module_get(owner))
3275                 return -ENODEV;
3276
3277         WARN_CONSOLE_UNLOCKED();
3278
3279         /* check if driver is registered and if it is unbindable */
3280         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3281                 con_driver = &registered_con_driver[i];
3282
3283                 if (con_driver->con == csw &&
3284                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3285                         retval = 0;
3286                         break;
3287                 }
3288         }
3289
3290         if (retval)
3291                 goto err;
3292
3293         retval = -ENODEV;
3294
3295         /* check if backup driver exists */
3296         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3297                 con_back = &registered_con_driver[i];
3298
3299                 if (con_back->con && con_back->con != csw) {
3300                         defcsw = con_back->con;
3301                         retval = 0;
3302                         break;
3303                 }
3304         }
3305
3306         if (retval)
3307                 goto err;
3308
3309         if (!con_is_bound(csw))
3310                 goto err;
3311
3312         first = max(first, con_driver->first);
3313         last = min(last, con_driver->last);
3314
3315         for (i = first; i <= last; i++) {
3316                 if (con_driver_map[i] == csw) {
3317                         module_put(csw->owner);
3318                         con_driver_map[i] = NULL;
3319                 }
3320         }
3321
3322         if (!con_is_bound(defcsw)) {
3323                 const struct consw *defconsw = conswitchp;
3324
3325                 defcsw->con_startup();
3326                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3327                 /*
3328                  * vgacon may change the default driver to point
3329                  * to dummycon, we restore it here...
3330                  */
3331                 conswitchp = defconsw;
3332         }
3333
3334         if (!con_is_bound(csw))
3335                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3336
3337         /* ignore return value, binding should not fail */
3338         do_bind_con_driver(defcsw, first, last, deflt);
3339 err:
3340         module_put(owner);
3341         return retval;
3342
3343 }
3344 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3345
3346 static int vt_bind(struct con_driver *con)
3347 {
3348         const struct consw *defcsw = NULL, *csw = NULL;
3349         int i, more = 1, first = -1, last = -1, deflt = 0;
3350
3351         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3352                 goto err;
3353
3354         csw = con->con;
3355
3356         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3357                 struct con_driver *con = &registered_con_driver[i];
3358
3359                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3360                         defcsw = con->con;
3361                         break;
3362                 }
3363         }
3364
3365         if (!defcsw)
3366                 goto err;
3367
3368         while (more) {
3369                 more = 0;
3370
3371                 for (i = con->first; i <= con->last; i++) {
3372                         if (con_driver_map[i] == defcsw) {
3373                                 if (first == -1)
3374                                         first = i;
3375                                 last = i;
3376                                 more = 1;
3377                         } else if (first != -1)
3378                                 break;
3379                 }
3380
3381                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3382                         deflt = 1;
3383
3384                 if (first != -1)
3385                         do_bind_con_driver(csw, first, last, deflt);
3386
3387                 first = -1;
3388                 last = -1;
3389                 deflt = 0;
3390         }
3391
3392 err:
3393         return 0;
3394 }
3395
3396 static int vt_unbind(struct con_driver *con)
3397 {
3398         const struct consw *csw = NULL;
3399         int i, more = 1, first = -1, last = -1, deflt = 0;
3400         int ret;
3401
3402         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3403                 goto err;
3404
3405         csw = con->con;
3406
3407         while (more) {
3408                 more = 0;
3409
3410                 for (i = con->first; i <= con->last; i++) {
3411                         if (con_driver_map[i] == csw) {
3412                                 if (first == -1)
3413                                         first = i;
3414                                 last = i;
3415                                 more = 1;
3416                         } else if (first != -1)
3417                                 break;
3418                 }
3419
3420                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3421                         deflt = 1;
3422
3423                 if (first != -1) {
3424                         ret = do_unbind_con_driver(csw, first, last, deflt);
3425                         if (ret != 0)
3426                                 return ret;
3427                 }
3428
3429                 first = -1;
3430                 last = -1;
3431                 deflt = 0;
3432         }
3433
3434 err:
3435         return 0;
3436 }
3437 #else
3438 static inline int vt_bind(struct con_driver *con)
3439 {
3440         return 0;
3441 }
3442 static inline int vt_unbind(struct con_driver *con)
3443 {
3444         return 0;
3445 }
3446 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3447
3448 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3449                           const char *buf, size_t count)
3450 {
3451         struct con_driver *con = dev_get_drvdata(dev);
3452         int bind = simple_strtoul(buf, NULL, 0);
3453
3454         console_lock();
3455
3456         if (bind)
3457                 vt_bind(con);
3458         else
3459                 vt_unbind(con);
3460
3461         console_unlock();
3462
3463         return count;
3464 }
3465
3466 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3467                          char *buf)
3468 {
3469         struct con_driver *con = dev_get_drvdata(dev);
3470         int bind = con_is_bound(con->con);
3471
3472         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3473 }
3474
3475 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3476                          char *buf)
3477 {
3478         struct con_driver *con = dev_get_drvdata(dev);
3479
3480         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3481                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3482                          con->desc);
3483
3484 }
3485
3486 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3487 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3488
3489 static struct attribute *con_dev_attrs[] = {
3490         &dev_attr_bind.attr,
3491         &dev_attr_name.attr,
3492         NULL
3493 };
3494
3495 ATTRIBUTE_GROUPS(con_dev);
3496
3497 static int vtconsole_init_device(struct con_driver *con)
3498 {
3499         con->flag |= CON_DRIVER_FLAG_ATTR;
3500         return 0;
3501 }
3502
3503 static void vtconsole_deinit_device(struct con_driver *con)
3504 {
3505         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3506 }
3507
3508 /**
3509  * con_is_bound - checks if driver is bound to the console
3510  * @csw: console driver
3511  *
3512  * RETURNS: zero if unbound, nonzero if bound
3513  *
3514  * Drivers can call this and if zero, they should release
3515  * all resources allocated on con_startup()
3516  */
3517 int con_is_bound(const struct consw *csw)
3518 {
3519         int i, bound = 0;
3520
3521         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3522                 if (con_driver_map[i] == csw) {
3523                         bound = 1;
3524                         break;
3525                 }
3526         }
3527
3528         return bound;
3529 }
3530 EXPORT_SYMBOL(con_is_bound);
3531
3532 /**
3533  * con_debug_enter - prepare the console for the kernel debugger
3534  * @sw: console driver
3535  *
3536  * Called when the console is taken over by the kernel debugger, this
3537  * function needs to save the current console state, then put the console
3538  * into a state suitable for the kernel debugger.
3539  *
3540  * RETURNS:
3541  * Zero on success, nonzero if a failure occurred when trying to prepare
3542  * the console for the debugger.
3543  */
3544 int con_debug_enter(struct vc_data *vc)
3545 {
3546         int ret = 0;
3547
3548         saved_fg_console = fg_console;
3549         saved_last_console = last_console;
3550         saved_want_console = want_console;
3551         saved_vc_mode = vc->vc_mode;
3552         saved_console_blanked = console_blanked;
3553         vc->vc_mode = KD_TEXT;
3554         console_blanked = 0;
3555         if (vc->vc_sw->con_debug_enter)
3556                 ret = vc->vc_sw->con_debug_enter(vc);
3557 #ifdef CONFIG_KGDB_KDB
3558         /* Set the initial LINES variable if it is not already set */
3559         if (vc->vc_rows < 999) {
3560                 int linecount;
3561                 char lns[4];
3562                 const char *setargs[3] = {
3563                         "set",
3564                         "LINES",
3565                         lns,
3566                 };
3567                 if (kdbgetintenv(setargs[0], &linecount)) {
3568                         snprintf(lns, 4, "%i", vc->vc_rows);
3569                         kdb_set(2, setargs);
3570                 }
3571         }
3572         if (vc->vc_cols < 999) {
3573                 int colcount;
3574                 char cols[4];
3575                 const char *setargs[3] = {
3576                         "set",
3577                         "COLUMNS",
3578                         cols,
3579                 };
3580                 if (kdbgetintenv(setargs[0], &colcount)) {
3581                         snprintf(cols, 4, "%i", vc->vc_cols);
3582                         kdb_set(2, setargs);
3583                 }
3584         }
3585 #endif /* CONFIG_KGDB_KDB */
3586         return ret;
3587 }
3588 EXPORT_SYMBOL_GPL(con_debug_enter);
3589
3590 /**
3591  * con_debug_leave - restore console state
3592  * @sw: console driver
3593  *
3594  * Restore the console state to what it was before the kernel debugger
3595  * was invoked.
3596  *
3597  * RETURNS:
3598  * Zero on success, nonzero if a failure occurred when trying to restore
3599  * the console.
3600  */
3601 int con_debug_leave(void)
3602 {
3603         struct vc_data *vc;
3604         int ret = 0;
3605
3606         fg_console = saved_fg_console;
3607         last_console = saved_last_console;
3608         want_console = saved_want_console;
3609         console_blanked = saved_console_blanked;
3610         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3611
3612         vc = vc_cons[fg_console].d;
3613         if (vc->vc_sw->con_debug_leave)
3614                 ret = vc->vc_sw->con_debug_leave(vc);
3615         return ret;
3616 }
3617 EXPORT_SYMBOL_GPL(con_debug_leave);
3618
3619 static int do_register_con_driver(const struct consw *csw, int first, int last)
3620 {
3621         struct module *owner = csw->owner;
3622         struct con_driver *con_driver;
3623         const char *desc;
3624         int i, retval;
3625
3626         WARN_CONSOLE_UNLOCKED();
3627
3628         if (!try_module_get(owner))
3629                 return -ENODEV;
3630
3631         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3632                 con_driver = &registered_con_driver[i];
3633
3634                 /* already registered */
3635                 if (con_driver->con == csw) {
3636                         retval = -EBUSY;
3637                         goto err;
3638                 }
3639         }
3640
3641         desc = csw->con_startup();
3642         if (!desc) {
3643                 retval = -ENODEV;
3644                 goto err;
3645         }
3646
3647         retval = -EINVAL;
3648
3649         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3650                 con_driver = &registered_con_driver[i];
3651
3652                 if (con_driver->con == NULL &&
3653                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3654                         con_driver->con = csw;
3655                         con_driver->desc = desc;
3656                         con_driver->node = i;
3657                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3658                                            CON_DRIVER_FLAG_INIT;
3659                         con_driver->first = first;
3660                         con_driver->last = last;
3661                         retval = 0;
3662                         break;
3663                 }
3664         }
3665
3666         if (retval)
3667                 goto err;
3668
3669         con_driver->dev =
3670                 device_create_with_groups(vtconsole_class, NULL,
3671                                           MKDEV(0, con_driver->node),
3672                                           con_driver, con_dev_groups,
3673                                           "vtcon%i", con_driver->node);
3674         if (IS_ERR(con_driver->dev)) {
3675                 printk(KERN_WARNING "Unable to create device for %s; "
3676                        "errno = %ld\n", con_driver->desc,
3677                        PTR_ERR(con_driver->dev));
3678                 con_driver->dev = NULL;
3679         } else {
3680                 vtconsole_init_device(con_driver);
3681         }
3682
3683 err:
3684         module_put(owner);
3685         return retval;
3686 }
3687
3688
3689 /**
3690  * do_unregister_con_driver - unregister console driver from console layer
3691  * @csw: console driver
3692  *
3693  * DESCRIPTION: All drivers that registers to the console layer must
3694  * call this function upon exit, or if the console driver is in a state
3695  * where it won't be able to handle console services, such as the
3696  * framebuffer console without loaded framebuffer drivers.
3697  *
3698  * The driver must unbind first prior to unregistration.
3699  */
3700 int do_unregister_con_driver(const struct consw *csw)
3701 {
3702         int i;
3703
3704         /* cannot unregister a bound driver */
3705         if (con_is_bound(csw))
3706                 return -EBUSY;
3707
3708         if (csw == conswitchp)
3709                 return -EINVAL;
3710
3711         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3712                 struct con_driver *con_driver = &registered_con_driver[i];
3713
3714                 if (con_driver->con == csw) {
3715                         /*
3716                          * Defer the removal of the sysfs entries since that
3717                          * will acquire the kernfs s_active lock and we can't
3718                          * acquire this lock while holding the console lock:
3719                          * the unbind sysfs entry imposes already the opposite
3720                          * order. Reset con already here to prevent any later
3721                          * lookup to succeed and mark this slot as zombie, so
3722                          * it won't get reused until we complete the removal
3723                          * in the deferred work.
3724                          */
3725                         con_driver->con = NULL;
3726                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3727                         schedule_work(&con_driver_unregister_work);
3728
3729                         return 0;
3730                 }
3731         }
3732
3733         return -ENODEV;
3734 }
3735 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3736
3737 static void con_driver_unregister_callback(struct work_struct *ignored)
3738 {
3739         int i;
3740
3741         console_lock();
3742
3743         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3744                 struct con_driver *con_driver = &registered_con_driver[i];
3745
3746                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3747                         continue;
3748
3749                 console_unlock();
3750
3751                 vtconsole_deinit_device(con_driver);
3752                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3753
3754                 console_lock();
3755
3756                 if (WARN_ON_ONCE(con_driver->con))
3757                         con_driver->con = NULL;
3758                 con_driver->desc = NULL;
3759                 con_driver->dev = NULL;
3760                 con_driver->node = 0;
3761                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3762                 con_driver->flag = 0;
3763                 con_driver->first = 0;
3764                 con_driver->last = 0;
3765         }
3766
3767         console_unlock();
3768 }
3769
3770 /*
3771  *      If we support more console drivers, this function is used
3772  *      when a driver wants to take over some existing consoles
3773  *      and become default driver for newly opened ones.
3774  *
3775  *      do_take_over_console is basically a register followed by unbind
3776  */
3777 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3778 {
3779         int err;
3780
3781         err = do_register_con_driver(csw, first, last);
3782         /*
3783          * If we get an busy error we still want to bind the console driver
3784          * and return success, as we may have unbound the console driver
3785          * but not unregistered it.
3786          */
3787         if (err == -EBUSY)
3788                 err = 0;
3789         if (!err)
3790                 do_bind_con_driver(csw, first, last, deflt);
3791
3792         return err;
3793 }
3794 EXPORT_SYMBOL_GPL(do_take_over_console);
3795
3796
3797 /*
3798  * give_up_console is a wrapper to unregister_con_driver. It will only
3799  * work if driver is fully unbound.
3800  */
3801 void give_up_console(const struct consw *csw)
3802 {
3803         console_lock();
3804         do_unregister_con_driver(csw);
3805         console_unlock();
3806 }
3807
3808 static int __init vtconsole_class_init(void)
3809 {
3810         int i;
3811
3812         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3813         if (IS_ERR(vtconsole_class)) {
3814                 printk(KERN_WARNING "Unable to create vt console class; "
3815                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3816                 vtconsole_class = NULL;
3817         }
3818
3819         /* Add system drivers to sysfs */
3820         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3821                 struct con_driver *con = &registered_con_driver[i];
3822
3823                 if (con->con && !con->dev) {
3824                         con->dev =
3825                                 device_create_with_groups(vtconsole_class, NULL,
3826                                                           MKDEV(0, con->node),
3827                                                           con, con_dev_groups,
3828                                                           "vtcon%i", con->node);
3829
3830                         if (IS_ERR(con->dev)) {
3831                                 printk(KERN_WARNING "Unable to create "
3832                                        "device for %s; errno = %ld\n",
3833                                        con->desc, PTR_ERR(con->dev));
3834                                 con->dev = NULL;
3835                         } else {
3836                                 vtconsole_init_device(con);
3837                         }
3838                 }
3839         }
3840
3841         return 0;
3842 }
3843 postcore_initcall(vtconsole_class_init);
3844
3845 #endif
3846
3847 /*
3848  *      Screen blanking
3849  */
3850
3851 static int set_vesa_blanking(char __user *p)
3852 {
3853         unsigned int mode;
3854
3855         if (get_user(mode, p + 1))
3856                 return -EFAULT;
3857
3858         vesa_blank_mode = (mode < 4) ? mode : 0;
3859         return 0;
3860 }
3861
3862 void do_blank_screen(int entering_gfx)
3863 {
3864         struct vc_data *vc = vc_cons[fg_console].d;
3865         int i;
3866
3867         WARN_CONSOLE_UNLOCKED();
3868
3869         if (console_blanked) {
3870                 if (blank_state == blank_vesa_wait) {
3871                         blank_state = blank_off;
3872                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3873                 }
3874                 return;
3875         }
3876
3877         /* entering graphics mode? */
3878         if (entering_gfx) {
3879                 hide_cursor(vc);
3880                 save_screen(vc);
3881                 vc->vc_sw->con_blank(vc, -1, 1);
3882                 console_blanked = fg_console + 1;
3883                 blank_state = blank_off;
3884                 set_origin(vc);
3885                 return;
3886         }
3887
3888         blank_state = blank_off;
3889
3890         /* don't blank graphics */
3891         if (vc->vc_mode != KD_TEXT) {
3892                 console_blanked = fg_console + 1;
3893                 return;
3894         }
3895
3896         hide_cursor(vc);
3897         del_timer_sync(&console_timer);
3898         blank_timer_expired = 0;
3899
3900         save_screen(vc);
3901         /* In case we need to reset origin, blanking hook returns 1 */
3902         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3903         console_blanked = fg_console + 1;
3904         if (i)
3905                 set_origin(vc);
3906
3907         if (console_blank_hook && console_blank_hook(1))
3908                 return;
3909
3910         if (vesa_off_interval && vesa_blank_mode) {
3911                 blank_state = blank_vesa_wait;
3912                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3913         }
3914         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3915 }
3916 EXPORT_SYMBOL(do_blank_screen);
3917
3918 /*
3919  * Called by timer as well as from vt_console_driver
3920  */
3921 void do_unblank_screen(int leaving_gfx)
3922 {
3923         struct vc_data *vc;
3924
3925         /* This should now always be called from a "sane" (read: can schedule)
3926          * context for the sake of the low level drivers, except in the special
3927          * case of oops_in_progress
3928          */
3929         if (!oops_in_progress)
3930                 might_sleep();
3931
3932         WARN_CONSOLE_UNLOCKED();
3933
3934         ignore_poke = 0;
3935         if (!console_blanked)
3936                 return;
3937         if (!vc_cons_allocated(fg_console)) {
3938                 /* impossible */
3939                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3940                         fg_console + 1);
3941                 return;
3942         }
3943         vc = vc_cons[fg_console].d;
3944         /* Try to unblank in oops case too */
3945         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3946                 return; /* but leave console_blanked != 0 */
3947
3948         if (blankinterval) {
3949                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3950                 blank_state = blank_normal_wait;
3951         }
3952
3953         console_blanked = 0;
3954         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3955                 /* Low-level driver cannot restore -> do it ourselves */
3956                 update_screen(vc);
3957         if (console_blank_hook)
3958                 console_blank_hook(0);
3959         set_palette(vc);
3960         set_cursor(vc);
3961         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3962 }
3963 EXPORT_SYMBOL(do_unblank_screen);
3964
3965 /*
3966  * This is called by the outside world to cause a forced unblank, mostly for
3967  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3968  * call it with 1 as an argument and so force a mode restore... that may kill
3969  * X or at least garbage the screen but would also make the Oops visible...
3970  */
3971 void unblank_screen(void)
3972 {
3973         do_unblank_screen(0);
3974 }
3975
3976 /*
3977  * We defer the timer blanking to work queue so it can take the console mutex
3978  * (console operations can still happen at irq time, but only from printk which
3979  * has the console mutex. Not perfect yet, but better than no locking
3980  */
3981 static void blank_screen_t(unsigned long dummy)
3982 {
3983         blank_timer_expired = 1;
3984         schedule_work(&console_work);
3985 }
3986
3987 void poke_blanked_console(void)
3988 {
3989         WARN_CONSOLE_UNLOCKED();
3990
3991         /* Add this so we quickly catch whoever might call us in a non
3992          * safe context. Nowadays, unblank_screen() isn't to be called in
3993          * atomic contexts and is allowed to schedule (with the special case
3994          * of oops_in_progress, but that isn't of any concern for this
3995          * function. --BenH.
3996          */
3997         might_sleep();
3998
3999         /* This isn't perfectly race free, but a race here would be mostly harmless,
4000          * at worse, we'll do a spurrious blank and it's unlikely
4001          */
4002         del_timer(&console_timer);
4003         blank_timer_expired = 0;
4004
4005         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4006                 return;
4007         if (console_blanked)
4008                 unblank_screen();
4009         else if (blankinterval) {
4010                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4011                 blank_state = blank_normal_wait;
4012         }
4013 }
4014
4015 /*
4016  *      Palettes
4017  */
4018
4019 static void set_palette(struct vc_data *vc)
4020 {
4021         WARN_CONSOLE_UNLOCKED();
4022
4023         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4024                 vc->vc_sw->con_set_palette(vc, color_table);
4025 }
4026
4027 /*
4028  * Load palette into the DAC registers. arg points to a colour
4029  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4030  */
4031
4032 int con_set_cmap(unsigned char __user *arg)
4033 {
4034         int i, j, k;
4035         unsigned char colormap[3*16];
4036
4037         if (copy_from_user(colormap, arg, sizeof(colormap)))
4038                 return -EFAULT;
4039
4040         console_lock();
4041         for (i = k = 0; i < 16; i++) {
4042                 default_red[i] = colormap[k++];
4043                 default_grn[i] = colormap[k++];
4044                 default_blu[i] = colormap[k++];
4045         }
4046         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4047                 if (!vc_cons_allocated(i))
4048                         continue;
4049                 for (j = k = 0; j < 16; j++) {
4050                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4051                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4052                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4053                 }
4054                 set_palette(vc_cons[i].d);
4055         }
4056         console_unlock();
4057
4058         return 0;
4059 }
4060
4061 int con_get_cmap(unsigned char __user *arg)
4062 {
4063         int i, k;
4064         unsigned char colormap[3*16];
4065
4066         console_lock();
4067         for (i = k = 0; i < 16; i++) {
4068                 colormap[k++] = default_red[i];
4069                 colormap[k++] = default_grn[i];
4070                 colormap[k++] = default_blu[i];
4071         }
4072         console_unlock();
4073
4074         if (copy_to_user(arg, colormap, sizeof(colormap)))
4075                 return -EFAULT;
4076
4077         return 0;
4078 }
4079
4080 void reset_palette(struct vc_data *vc)
4081 {
4082         int j, k;
4083         for (j=k=0; j<16; j++) {
4084                 vc->vc_palette[k++] = default_red[j];
4085                 vc->vc_palette[k++] = default_grn[j];
4086                 vc->vc_palette[k++] = default_blu[j];
4087         }
4088         set_palette(vc);
4089 }
4090
4091 /*
4092  *  Font switching
4093  *
4094  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4095  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4096  *  depending on width) reserved for each character which is kinda wasty, but
4097  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4098  *  is up to the actual low-level console-driver convert data into its favorite
4099  *  format (maybe we should add a `fontoffset' field to the `display'
4100  *  structure so we won't have to convert the fontdata all the time.
4101  *  /Jes
4102  */
4103
4104 #define max_font_size 65536
4105
4106 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4107 {
4108         struct console_font font;
4109         int rc = -EINVAL;
4110         int c;
4111
4112         if (op->data) {
4113                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4114                 if (!font.data)
4115                         return -ENOMEM;
4116         } else
4117                 font.data = NULL;
4118
4119         console_lock();
4120         if (vc->vc_mode != KD_TEXT)
4121                 rc = -EINVAL;
4122         else if (vc->vc_sw->con_font_get)
4123                 rc = vc->vc_sw->con_font_get(vc, &font);
4124         else
4125                 rc = -ENOSYS;
4126         console_unlock();
4127
4128         if (rc)
4129                 goto out;
4130
4131         c = (font.width+7)/8 * 32 * font.charcount;
4132
4133         if (op->data && font.charcount > op->charcount)
4134                 rc = -ENOSPC;
4135         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4136                 if (font.width > op->width || font.height > op->height)
4137                         rc = -ENOSPC;
4138         } else {
4139                 if (font.width != 8)
4140                         rc = -EIO;
4141                 else if ((op->height && font.height > op->height) ||
4142                          font.height > 32)
4143                         rc = -ENOSPC;
4144         }
4145         if (rc)
4146                 goto out;
4147
4148         op->height = font.height;
4149         op->width = font.width;
4150         op->charcount = font.charcount;
4151
4152         if (op->data && copy_to_user(op->data, font.data, c))
4153                 rc = -EFAULT;
4154
4155 out:
4156         kfree(font.data);
4157         return rc;
4158 }
4159
4160 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4161 {
4162         struct console_font font;
4163         int rc = -EINVAL;
4164         int size;
4165
4166         if (vc->vc_mode != KD_TEXT)
4167                 return -EINVAL;
4168         if (!op->data)
4169                 return -EINVAL;
4170         if (op->charcount > 512)
4171                 return -EINVAL;
4172         if (!op->height) {              /* Need to guess font height [compat] */
4173                 int h, i;
4174                 u8 __user *charmap = op->data;
4175                 u8 tmp;
4176
4177                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4178                    so that we can get rid of this soon */
4179                 if (!(op->flags & KD_FONT_FLAG_OLD))
4180                         return -EINVAL;
4181                 for (h = 32; h > 0; h--)
4182                         for (i = 0; i < op->charcount; i++) {
4183                                 if (get_user(tmp, &charmap[32*i+h-1]))
4184                                         return -EFAULT;
4185                                 if (tmp)
4186                                         goto nonzero;
4187                         }
4188                 return -EINVAL;
4189         nonzero:
4190                 op->height = h;
4191         }
4192         if (op->width <= 0 || op->width > 32 || op->height > 32)
4193                 return -EINVAL;
4194         size = (op->width+7)/8 * 32 * op->charcount;
4195         if (size > max_font_size)
4196                 return -ENOSPC;
4197         font.charcount = op->charcount;
4198         font.height = op->height;
4199         font.width = op->width;
4200         font.data = memdup_user(op->data, size);
4201         if (IS_ERR(font.data))
4202                 return PTR_ERR(font.data);
4203         console_lock();
4204         if (vc->vc_mode != KD_TEXT)
4205                 rc = -EINVAL;
4206         else if (vc->vc_sw->con_font_set)
4207                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4208         else
4209                 rc = -ENOSYS;
4210         console_unlock();
4211         kfree(font.data);
4212         return rc;
4213 }
4214
4215 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4216 {
4217         struct console_font font = {.width = op->width, .height = op->height};
4218         char name[MAX_FONT_NAME];
4219         char *s = name;
4220         int rc;
4221
4222
4223         if (!op->data)
4224                 s = NULL;
4225         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4226                 return -EFAULT;
4227         else
4228                 name[MAX_FONT_NAME - 1] = 0;
4229
4230         console_lock();
4231         if (vc->vc_mode != KD_TEXT) {
4232                 console_unlock();
4233                 return -EINVAL;
4234         }
4235         if (vc->vc_sw->con_font_default)
4236                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4237         else
4238                 rc = -ENOSYS;
4239         console_unlock();
4240         if (!rc) {
4241                 op->width = font.width;
4242                 op->height = font.height;
4243         }
4244         return rc;
4245 }
4246
4247 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4248 {
4249         switch (op->op) {
4250         case KD_FONT_OP_SET:
4251                 return con_font_set(vc, op);
4252         case KD_FONT_OP_GET:
4253                 return con_font_get(vc, op);
4254         case KD_FONT_OP_SET_DEFAULT:
4255                 return con_font_default(vc, op);
4256         case KD_FONT_OP_COPY:
4257                 /* was buggy and never really used */
4258                 return -EINVAL;
4259         }
4260         return -ENOSYS;
4261 }
4262
4263 /*
4264  *      Interface exported to selection and vcs.
4265  */
4266
4267 /* used by selection */
4268 u16 screen_glyph(struct vc_data *vc, int offset)
4269 {
4270         u16 w = scr_readw(screenpos(vc, offset, 1));
4271         u16 c = w & 0xff;
4272
4273         if (w & vc->vc_hi_font_mask)
4274                 c |= 0x100;
4275         return c;
4276 }
4277 EXPORT_SYMBOL_GPL(screen_glyph);
4278
4279 /* used by vcs - note the word offset */
4280 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4281 {
4282         return screenpos(vc, 2 * w_offset, viewed);
4283 }
4284 EXPORT_SYMBOL_GPL(screen_pos);
4285
4286 void getconsxy(struct vc_data *vc, unsigned char *p)
4287 {
4288         p[0] = vc->vc_x;
4289         p[1] = vc->vc_y;
4290 }
4291
4292 void putconsxy(struct vc_data *vc, unsigned char *p)
4293 {
4294         hide_cursor(vc);
4295         gotoxy(vc, p[0], p[1]);
4296         set_cursor(vc);
4297 }
4298
4299 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4300 {
4301         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4302                 return softcursor_original;
4303         return scr_readw(org);
4304 }
4305
4306 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4307 {
4308         scr_writew(val, org);
4309         if ((unsigned long)org == vc->vc_pos) {
4310                 softcursor_original = -1;
4311                 add_softcursor(vc);
4312         }
4313 }
4314
4315 void vcs_scr_updated(struct vc_data *vc)
4316 {
4317         notify_update(vc);
4318 }
4319
4320 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4321                 unsigned int rolled_over, void *base, unsigned int size)
4322 {
4323         unsigned long ubase = (unsigned long)base;
4324         ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4325         ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4326         ptrdiff_t origin = (void *)c->vc_origin - base;
4327         int margin = c->vc_size_row * 4;
4328         int from, wrap, from_off, avail;
4329
4330         /* Turn scrollback off */
4331         if (!lines) {
4332                 c->vc_visible_origin = c->vc_origin;
4333                 return;
4334         }
4335
4336         /* Do we have already enough to allow jumping from 0 to the end? */
4337         if (rolled_over > scr_end + margin) {
4338                 from = scr_end;
4339                 wrap = rolled_over + c->vc_size_row;
4340         } else {
4341                 from = 0;
4342                 wrap = size;
4343         }
4344
4345         from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4346         avail = (origin - from + wrap) % wrap;
4347
4348         /* Only a little piece would be left? Show all incl. the piece! */
4349         if (avail < 2 * margin)
4350                 margin = 0;
4351         if (from_off < margin)
4352                 from_off = 0;
4353         if (from_off > avail - margin)
4354                 from_off = avail;
4355
4356         c->vc_visible_origin = ubase + (from + from_off) % wrap;
4357 }
4358 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4359
4360 /*
4361  *      Visible symbols for modules
4362  */
4363
4364 EXPORT_SYMBOL(color_table);
4365 EXPORT_SYMBOL(default_red);
4366 EXPORT_SYMBOL(default_grn);
4367 EXPORT_SYMBOL(default_blu);
4368 EXPORT_SYMBOL(update_region);
4369 EXPORT_SYMBOL(redraw_screen);
4370 EXPORT_SYMBOL(vc_resize);
4371 EXPORT_SYMBOL(fg_console);
4372 EXPORT_SYMBOL(console_blank_hook);
4373 EXPORT_SYMBOL(console_blanked);
4374 EXPORT_SYMBOL(vc_cons);
4375 EXPORT_SYMBOL(global_cursor_default);
4376 #ifndef VT_SINGLE_DRIVER
4377 EXPORT_SYMBOL(give_up_console);
4378 #endif