drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <g-hunt@ee.utah.edu>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21  *
  22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <poe@daimi.aau.dk>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <geert@linux-m68k.org>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <arno@usn.nl>
  39  *     - David Carter <carter@cs.bris.ac.uk>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111 #define CON_DRIVER_FLAG_ZOMBIE 8
 112
 113 struct con_driver {
 114         const struct consw *con;
 115         const char *desc;
 116         struct device *dev;
 117         int node;
 118         int first;
 119         int last;
 120         int flag;
 121 };
 122
 123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 124 const struct consw *conswitchp;
 125
 126 /* A bitmap for codes <32. A bit of 1 indicates that the code
 127  * corresponding to that bit number invokes some special action
 128  * (such as cursor movement) and should not be displayed as a
 129  * glyph unless the disp_ctrl mode is explicitly enabled.
 130  */
 131 #define CTRL_ACTION 0x0d00ff81
 132 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 133
 134 /*
 135  * Here is the default bell parameters: 750HZ, 1/8th of a second
 136  */
 137 #define DEFAULT_BELL_PITCH      750
 138 #define DEFAULT_BELL_DURATION   (HZ/8)
 139 #define DEFAULT_CURSOR_BLINK_MS 200
 140
 141 struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143 #ifndef VT_SINGLE_DRIVER
 144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145 #endif
 146
 147 static int con_open(struct tty_struct *, struct file *);
 148 static void vc_init(struct vc_data *vc, unsigned int rows,
 149                     unsigned int cols, int do_clear);
 150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151 static void save_cur(struct vc_data *vc);
 152 static void reset_terminal(struct vc_data *vc, int do_clear);
 153 static void con_flush_chars(struct tty_struct *tty);
 154 static int set_vesa_blanking(char __user *p);
 155 static void set_cursor(struct vc_data *vc);
 156 static void hide_cursor(struct vc_data *vc);
 157 static void console_callback(struct work_struct *ignored);
 158 static void con_driver_unregister_callback(struct work_struct *ignored);
 159 static void blank_screen_t(unsigned long dummy);
 160 static void set_palette(struct vc_data *vc);
 161
 162 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 163
 164 static int printable;           /* Is console ready for printing? */
 165 int default_utf8 = true;
 166 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 167 int global_cursor_default = -1;
 168 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 169
 170 static int cur_default = CUR_DEFAULT;
 171 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 172
 173 /*
 174  * ignore_poke: don't unblank the screen when things are typed.  This is
 175  * mainly for the privacy of braille terminal users.
 176  */
 177 static int ignore_poke;
 178
 179 int do_poke_blanked_console;
 180 int console_blanked;
 181
 182 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 183 static int vesa_off_interval;
 184 static int blankinterval = 10*60;
 185 core_param(consoleblank, blankinterval, int, 0444);
 186
 187 static DECLARE_WORK(console_work, console_callback);
 188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 189
 190 /*
 191  * fg_console is the current virtual console,
 192  * last_console is the last used one,
 193  * want_console is the console we want to switch to,
 194  * saved_* variants are for save/restore around kernel debugger enter/leave
 195  */
 196 int fg_console;
 197 int last_console;
 198 int want_console = -1;
 199 static int saved_fg_console;
 200 static int saved_last_console;
 201 static int saved_want_console;
 202 static int saved_vc_mode;
 203 static int saved_console_blanked;
 204
 205 /*
 206  * For each existing display, we have a pointer to console currently visible
 207  * on that display, allowing consoles other than fg_console to be refreshed
 208  * appropriately. Unless the low-level driver supplies its own display_fg
 209  * variable, we use this one for the "master display".
 210  */
 211 static struct vc_data *master_display_fg;
 212
 213 /*
 214  * Unfortunately, we need to delay tty echo when we're currently writing to the
 215  * console since the code is (and always was) not re-entrant, so we schedule
 216  * all flip requests to process context with schedule-task() and run it from
 217  * console_callback().
 218  */
 219
 220 /*
 221  * For the same reason, we defer scrollback to the console callback.
 222  */
 223 static int scrollback_delta;
 224
 225 /*
 226  * Hook so that the power management routines can (un)blank
 227  * the console on our behalf.
 228  */
 229 int (*console_blank_hook)(int);
 230
 231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 232 static int blank_state;
 233 static int blank_timer_expired;
 234 enum {
 235         blank_off = 0,
 236         blank_normal_wait,
 237         blank_vesa_wait,
 238 };
 239
 240 /*
 241  * /sys/class/tty/tty0/
 242  *
 243  * the attribute 'active' contains the name of the current vc
 244  * console and it supports poll() to detect vc switches
 245  */
 246 static struct device *tty0dev;
 247
 248 /*
 249  * Notifier list for console events.
 250  */
 251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 252
 253 int register_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(register_vt_notifier);
 258
 259 int unregister_vt_notifier(struct notifier_block *nb)
 260 {
 261         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 262 }
 263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 264
 265 static void notify_write(struct vc_data *vc, unsigned int unicode)
 266 {
 267         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 269 }
 270
 271 static void notify_update(struct vc_data *vc)
 272 {
 273         struct vt_notifier_param param = { .vc = vc };
 274         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 275 }
 276 /*
 277  *      Low-Level Functions
 278  */
 279
 280 static inline bool con_is_fg(const struct vc_data *vc)
 281 {
 282         return vc->vc_num == fg_console;
 283 }
 284
 285 static inline bool con_should_update(const struct vc_data *vc)
 286 {
 287         return con_is_visible(vc) && !console_blanked;
 288 }
 289
 290 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 291 {
 292         unsigned short *p;
 293
 294         if (!viewed)
 295                 p = (unsigned short *)(vc->vc_origin + offset);
 296         else if (!vc->vc_sw->con_screen_pos)
 297                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 298         else
 299                 p = vc->vc_sw->con_screen_pos(vc, offset);
 300         return p;
 301 }
 302
 303 /* Called  from the keyboard irq path.. */
 304 static inline void scrolldelta(int lines)
 305 {
 306         /* FIXME */
 307         /* scrolldelta needs some kind of consistency lock, but the BKL was
 308            and still is not protecting versus the scheduled back end */
 309         scrollback_delta += lines;
 310         schedule_console_callback();
 311 }
 312
 313 void schedule_console_callback(void)
 314 {
 315         schedule_work(&console_work);
 316 }
 317
 318 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 319                 enum con_scroll dir, unsigned int nr)
 320 {
 321         u16 *clear, *d, *s;
 322
 323         if (t + nr >= b)
 324                 nr = b - t - 1;
 325         if (b > vc->vc_rows || t >= b || nr < 1)
 326                 return;
 327         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
 328                 return;
 329
 330         s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
 331         d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 332
 333         if (dir == SM_UP) {
 334                 clear = s + (b - t - nr) * vc->vc_cols;
 335                 swap(s, d);
 336         }
 337         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 338         scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
 339 }
 340
 341 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 342 {
 343         unsigned int xx, yy, offset;
 344         u16 *p;
 345
 346         p = (u16 *) start;
 347         if (!vc->vc_sw->con_getxy) {
 348                 offset = (start - vc->vc_origin) / 2;
 349                 xx = offset % vc->vc_cols;
 350                 yy = offset / vc->vc_cols;
 351         } else {
 352                 int nxx, nyy;
 353                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 354                 xx = nxx; yy = nyy;
 355         }
 356         for(;;) {
 357                 u16 attrib = scr_readw(p) & 0xff00;
 358                 int startx = xx;
 359                 u16 *q = p;
 360                 while (xx < vc->vc_cols && count) {
 361                         if (attrib != (scr_readw(p) & 0xff00)) {
 362                                 if (p > q)
 363                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 364                                 startx = xx;
 365                                 q = p;
 366                                 attrib = scr_readw(p) & 0xff00;
 367                         }
 368                         p++;
 369                         xx++;
 370                         count--;
 371                 }
 372                 if (p > q)
 373                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 374                 if (!count)
 375                         break;
 376                 xx = 0;
 377                 yy++;
 378                 if (vc->vc_sw->con_getxy) {
 379                         p = (u16 *)start;
 380                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 381                 }
 382         }
 383 }
 384
 385 void update_region(struct vc_data *vc, unsigned long start, int count)
 386 {
 387         WARN_CONSOLE_UNLOCKED();
 388
 389         if (con_should_update(vc)) {
 390                 hide_cursor(vc);
 391                 do_update_region(vc, start, count);
 392                 set_cursor(vc);
 393         }
 394 }
 395
 396 /* Structure of attributes is hardware-dependent */
 397
 398 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 399     u8 _underline, u8 _reverse, u8 _italic)
 400 {
 401         if (vc->vc_sw->con_build_attr)
 402                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 403                        _blink, _underline, _reverse, _italic);
 404
 405 /*
 406  * ++roman: I completely changed the attribute format for monochrome
 407  * mode (!can_do_color). The formerly used MDA (monochrome display
 408  * adapter) format didn't allow the combination of certain effects.
 409  * Now the attribute is just a bit vector:
 410  *  Bit 0..1: intensity (0..2)
 411  *  Bit 2   : underline
 412  *  Bit 3   : reverse
 413  *  Bit 7   : blink
 414  */
 415         {
 416         u8 a = _color;
 417         if (!vc->vc_can_do_color)
 418                 return _intensity |
 419                        (_italic ? 2 : 0) |
 420                        (_underline ? 4 : 0) |
 421                        (_reverse ? 8 : 0) |
 422                        (_blink ? 0x80 : 0);
 423         if (_italic)
 424                 a = (a & 0xF0) | vc->vc_itcolor;
 425         else if (_underline)
 426                 a = (a & 0xf0) | vc->vc_ulcolor;
 427         else if (_intensity == 0)
 428                 a = (a & 0xf0) | vc->vc_ulcolor;
 429         if (_reverse)
 430                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 431         if (_blink)
 432                 a ^= 0x80;
 433         if (_intensity == 2)
 434                 a ^= 0x08;
 435         if (vc->vc_hi_font_mask == 0x100)
 436                 a <<= 1;
 437         return a;
 438         }
 439 }
 440
 441 static void update_attr(struct vc_data *vc)
 442 {
 443         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 444                       vc->vc_blink, vc->vc_underline,
 445                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 446         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 447 }
 448
 449 /* Note: inverting the screen twice should revert to the original state */
 450 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 451 {
 452         unsigned short *p;
 453
 454         WARN_CONSOLE_UNLOCKED();
 455
 456         count /= 2;
 457         p = screenpos(vc, offset, viewed);
 458         if (vc->vc_sw->con_invert_region) {
 459                 vc->vc_sw->con_invert_region(vc, p, count);
 460         } else {
 461                 u16 *q = p;
 462                 int cnt = count;
 463                 u16 a;
 464
 465                 if (!vc->vc_can_do_color) {
 466                         while (cnt--) {
 467                             a = scr_readw(q);
 468                             a ^= 0x0800;
 469                             scr_writew(a, q);
 470                             q++;
 471                         }
 472                 } else if (vc->vc_hi_font_mask == 0x100) {
 473                         while (cnt--) {
 474                                 a = scr_readw(q);
 475                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 476                                 scr_writew(a, q);
 477                                 q++;
 478                         }
 479                 } else {
 480                         while (cnt--) {
 481                                 a = scr_readw(q);
 482                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 483                                 scr_writew(a, q);
 484                                 q++;
 485                         }
 486                 }
 487         }
 488
 489         if (con_should_update(vc))
 490                 do_update_region(vc, (unsigned long) p, count);
 491         notify_update(vc);
 492 }
 493
 494 /* used by selection: complement pointer position */
 495 void complement_pos(struct vc_data *vc, int offset)
 496 {
 497         static int old_offset = -1;
 498         static unsigned short old;
 499         static unsigned short oldx, oldy;
 500
 501         WARN_CONSOLE_UNLOCKED();
 502
 503         if (old_offset != -1 && old_offset >= 0 &&
 504             old_offset < vc->vc_screenbuf_size) {
 505                 scr_writew(old, screenpos(vc, old_offset, 1));
 506                 if (con_should_update(vc))
 507                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 508                 notify_update(vc);
 509         }
 510
 511         old_offset = offset;
 512
 513         if (offset != -1 && offset >= 0 &&
 514             offset < vc->vc_screenbuf_size) {
 515                 unsigned short new;
 516                 unsigned short *p;
 517                 p = screenpos(vc, offset, 1);
 518                 old = scr_readw(p);
 519                 new = old ^ vc->vc_complement_mask;
 520                 scr_writew(new, p);
 521                 if (con_should_update(vc)) {
 522                         oldx = (offset >> 1) % vc->vc_cols;
 523                         oldy = (offset >> 1) / vc->vc_cols;
 524                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 525                 }
 526                 notify_update(vc);
 527         }
 528 }
 529
 530 static void insert_char(struct vc_data *vc, unsigned int nr)
 531 {
 532         unsigned short *p = (unsigned short *) vc->vc_pos;
 533
 534         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 535         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 536         vc->vc_need_wrap = 0;
 537         if (con_should_update(vc))
 538                 do_update_region(vc, (unsigned long) p,
 539                         vc->vc_cols - vc->vc_x);
 540 }
 541
 542 static void delete_char(struct vc_data *vc, unsigned int nr)
 543 {
 544         unsigned short *p = (unsigned short *) vc->vc_pos;
 545
 546         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 547         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 548                         nr * 2);
 549         vc->vc_need_wrap = 0;
 550         if (con_should_update(vc))
 551                 do_update_region(vc, (unsigned long) p,
 552                         vc->vc_cols - vc->vc_x);
 553 }
 554
 555 static int softcursor_original = -1;
 556
 557 static void add_softcursor(struct vc_data *vc)
 558 {
 559         int i = scr_readw((u16 *) vc->vc_pos);
 560         u32 type = vc->vc_cursor_type;
 561
 562         if (! (type & 0x10)) return;
 563         if (softcursor_original != -1) return;
 564         softcursor_original = i;
 565         i |= ((type >> 8) & 0xff00 );
 566         i ^= ((type) & 0xff00 );
 567         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 568         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 569         scr_writew(i, (u16 *) vc->vc_pos);
 570         if (con_should_update(vc))
 571                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 572 }
 573
 574 static void hide_softcursor(struct vc_data *vc)
 575 {
 576         if (softcursor_original != -1) {
 577                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 578                 if (con_should_update(vc))
 579                         vc->vc_sw->con_putc(vc, softcursor_original,
 580                                         vc->vc_y, vc->vc_x);
 581                 softcursor_original = -1;
 582         }
 583 }
 584
 585 static void hide_cursor(struct vc_data *vc)
 586 {
 587         if (vc == sel_cons)
 588                 clear_selection();
 589         vc->vc_sw->con_cursor(vc, CM_ERASE);
 590         hide_softcursor(vc);
 591 }
 592
 593 static void set_cursor(struct vc_data *vc)
 594 {
 595         if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
 596                 return;
 597         if (vc->vc_deccm) {
 598                 if (vc == sel_cons)
 599                         clear_selection();
 600                 add_softcursor(vc);
 601                 if ((vc->vc_cursor_type & 0x0f) != 1)
 602                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 603         } else
 604                 hide_cursor(vc);
 605 }
 606
 607 static void set_origin(struct vc_data *vc)
 608 {
 609         WARN_CONSOLE_UNLOCKED();
 610
 611         if (!con_is_visible(vc) ||
 612             !vc->vc_sw->con_set_origin ||
 613             !vc->vc_sw->con_set_origin(vc))
 614                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 615         vc->vc_visible_origin = vc->vc_origin;
 616         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 617         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 618 }
 619
 620 static void save_screen(struct vc_data *vc)
 621 {
 622         WARN_CONSOLE_UNLOCKED();
 623
 624         if (vc->vc_sw->con_save_screen)
 625                 vc->vc_sw->con_save_screen(vc);
 626 }
 627
 628 /*
 629  *      Redrawing of screen
 630  */
 631
 632 void clear_buffer_attributes(struct vc_data *vc)
 633 {
 634         unsigned short *p = (unsigned short *)vc->vc_origin;
 635         int count = vc->vc_screenbuf_size / 2;
 636         int mask = vc->vc_hi_font_mask | 0xff;
 637
 638         for (; count > 0; count--, p++) {
 639                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 640         }
 641 }
 642
 643 void redraw_screen(struct vc_data *vc, int is_switch)
 644 {
 645         int redraw = 0;
 646
 647         WARN_CONSOLE_UNLOCKED();
 648
 649         if (!vc) {
 650                 /* strange ... */
 651                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 652                 return;
 653         }
 654
 655         if (is_switch) {
 656                 struct vc_data *old_vc = vc_cons[fg_console].d;
 657                 if (old_vc == vc)
 658                         return;
 659                 if (!con_is_visible(vc))
 660                         redraw = 1;
 661                 *vc->vc_display_fg = vc;
 662                 fg_console = vc->vc_num;
 663                 hide_cursor(old_vc);
 664                 if (!con_is_visible(old_vc)) {
 665                         save_screen(old_vc);
 666                         set_origin(old_vc);
 667                 }
 668                 if (tty0dev)
 669                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 670         } else {
 671                 hide_cursor(vc);
 672                 redraw = 1;
 673         }
 674
 675         if (redraw) {
 676                 int update;
 677                 int old_was_color = vc->vc_can_do_color;
 678
 679                 set_origin(vc);
 680                 update = vc->vc_sw->con_switch(vc);
 681                 set_palette(vc);
 682                 /*
 683                  * If console changed from mono<->color, the best we can do
 684                  * is to clear the buffer attributes. As it currently stands,
 685                  * rebuilding new attributes from the old buffer is not doable
 686                  * without overly complex code.
 687                  */
 688                 if (old_was_color != vc->vc_can_do_color) {
 689                         update_attr(vc);
 690                         clear_buffer_attributes(vc);
 691                 }
 692
 693                 /* Forcibly update if we're panicing */
 694                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 695                     vt_force_oops_output(vc))
 696                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 697         }
 698         set_cursor(vc);
 699         if (is_switch) {
 700                 set_leds();
 701                 compute_shiftstate();
 702                 notify_update(vc);
 703         }
 704 }
 705
 706 /*
 707  *      Allocation, freeing and resizing of VTs.
 708  */
 709
 710 int vc_cons_allocated(unsigned int i)
 711 {
 712         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 713 }
 714
 715 static void visual_init(struct vc_data *vc, int num, int init)
 716 {
 717         /* ++Geert: vc->vc_sw->con_init determines console size */
 718         if (vc->vc_sw)
 719                 module_put(vc->vc_sw->owner);
 720         vc->vc_sw = conswitchp;
 721 #ifndef VT_SINGLE_DRIVER
 722         if (con_driver_map[num])
 723                 vc->vc_sw = con_driver_map[num];
 724 #endif
 725         __module_get(vc->vc_sw->owner);
 726         vc->vc_num = num;
 727         vc->vc_display_fg = &master_display_fg;
 728         if (vc->vc_uni_pagedir_loc)
 729                 con_free_unimap(vc);
 730         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 731         vc->vc_uni_pagedir = NULL;
 732         vc->vc_hi_font_mask = 0;
 733         vc->vc_complement_mask = 0;
 734         vc->vc_can_do_color = 0;
 735         vc->vc_panic_force_write = false;
 736         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
 737         vc->vc_sw->con_init(vc, init);
 738         if (!vc->vc_complement_mask)
 739                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 740         vc->vc_s_complement_mask = vc->vc_complement_mask;
 741         vc->vc_size_row = vc->vc_cols << 1;
 742         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 743 }
 744
 745 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 746 {
 747         struct vt_notifier_param param;
 748         struct vc_data *vc;
 749
 750         WARN_CONSOLE_UNLOCKED();
 751
 752         if (currcons >= MAX_NR_CONSOLES)
 753                 return -ENXIO;
 754
 755         if (vc_cons[currcons].d)
 756                 return 0;
 757
 758         /* due to the granularity of kmalloc, we waste some memory here */
 759         /* the alloc is done in two steps, to optimize the common situation
 760            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 761         /* although the numbers above are not valid since long ago, the
 762            point is still up-to-date and the comment still has its value
 763            even if only as a historical artifact.  --mj, July 1998 */
 764         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 765         if (!vc)
 766                 return -ENOMEM;
 767
 768         vc_cons[currcons].d = vc;
 769         tty_port_init(&vc->port);
 770         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 771
 772         visual_init(vc, currcons, 1);
 773
 774         if (!*vc->vc_uni_pagedir_loc)
 775                 con_set_default_unimap(vc);
 776
 777         vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 778         if (!vc->vc_screenbuf)
 779                 goto err_free;
 780
 781         /* If no drivers have overridden us and the user didn't pass a
 782            boot option, default to displaying the cursor */
 783         if (global_cursor_default == -1)
 784                 global_cursor_default = 1;
 785
 786         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 787         vcs_make_sysfs(currcons);
 788         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 789
 790         return 0;
 791 err_free:
 792         kfree(vc);
 793         vc_cons[currcons].d = NULL;
 794         return -ENOMEM;
 795 }
 796
 797 static inline int resize_screen(struct vc_data *vc, int width, int height,
 798                                 int user)
 799 {
 800         /* Resizes the resolution of the display adapater */
 801         int err = 0;
 802
 803         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 804                 err = vc->vc_sw->con_resize(vc, width, height, user);
 805
 806         return err;
 807 }
 808
 809 /*
 810  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 811  * [this is to be used together with some user program
 812  * like resize that changes the hardware videomode]
 813  */
 814 #define VC_RESIZE_MAXCOL (32767)
 815 #define VC_RESIZE_MAXROW (32767)
 816
 817 /**
 818  *      vc_do_resize    -       resizing method for the tty
 819  *      @tty: tty being resized
 820  *      @real_tty: real tty (different to tty if a pty/tty pair)
 821  *      @vc: virtual console private data
 822  *      @cols: columns
 823  *      @lines: lines
 824  *
 825  *      Resize a virtual console, clipping according to the actual constraints.
 826  *      If the caller passes a tty structure then update the termios winsize
 827  *      information and perform any necessary signal handling.
 828  *
 829  *      Caller must hold the console semaphore. Takes the termios rwsem and
 830  *      ctrl_lock of the tty IFF a tty is passed.
 831  */
 832
 833 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 834                                 unsigned int cols, unsigned int lines)
 835 {
 836         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 837         unsigned long end;
 838         unsigned int old_rows, old_row_size;
 839         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 840         unsigned int user;
 841         unsigned short *newscreen;
 842
 843         WARN_CONSOLE_UNLOCKED();
 844
 845         if (!vc)
 846                 return -ENXIO;
 847
 848         user = vc->vc_resize_user;
 849         vc->vc_resize_user = 0;
 850
 851         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 852                 return -EINVAL;
 853
 854         new_cols = (cols ? cols : vc->vc_cols);
 855         new_rows = (lines ? lines : vc->vc_rows);
 856         new_row_size = new_cols << 1;
 857         new_screen_size = new_row_size * new_rows;
 858
 859         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 860                 return 0;
 861
 862         if (new_screen_size > (4 << 20))
 863                 return -EINVAL;
 864         newscreen = kmalloc(new_screen_size, GFP_USER);
 865         if (!newscreen)
 866                 return -ENOMEM;
 867
 868         if (vc == sel_cons)
 869                 clear_selection();
 870
 871         old_rows = vc->vc_rows;
 872         old_row_size = vc->vc_size_row;
 873
 874         err = resize_screen(vc, new_cols, new_rows, user);
 875         if (err) {
 876                 kfree(newscreen);
 877                 return err;
 878         }
 879
 880         vc->vc_rows = new_rows;
 881         vc->vc_cols = new_cols;
 882         vc->vc_size_row = new_row_size;
 883         vc->vc_screenbuf_size = new_screen_size;
 884
 885         rlth = min(old_row_size, new_row_size);
 886         rrem = new_row_size - rlth;
 887         old_origin = vc->vc_origin;
 888         new_origin = (long) newscreen;
 889         new_scr_end = new_origin + new_screen_size;
 890
 891         if (vc->vc_y > new_rows) {
 892                 if (old_rows - vc->vc_y < new_rows) {
 893                         /*
 894                          * Cursor near the bottom, copy contents from the
 895                          * bottom of buffer
 896                          */
 897                         old_origin += (old_rows - new_rows) * old_row_size;
 898                 } else {
 899                         /*
 900                          * Cursor is in no man's land, copy 1/2 screenful
 901                          * from the top and bottom of cursor position
 902                          */
 903                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 904                 }
 905         }
 906
 907         end = old_origin + old_row_size * min(old_rows, new_rows);
 908
 909         update_attr(vc);
 910
 911         while (old_origin < end) {
 912                 scr_memcpyw((unsigned short *) new_origin,
 913                             (unsigned short *) old_origin, rlth);
 914                 if (rrem)
 915                         scr_memsetw((void *)(new_origin + rlth),
 916                                     vc->vc_video_erase_char, rrem);
 917                 old_origin += old_row_size;
 918                 new_origin += new_row_size;
 919         }
 920         if (new_scr_end > new_origin)
 921                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 922                             new_scr_end - new_origin);
 923         kfree(vc->vc_screenbuf);
 924         vc->vc_screenbuf = newscreen;
 925         vc->vc_screenbuf_size = new_screen_size;
 926         set_origin(vc);
 927
 928         /* do part of a reset_terminal() */
 929         vc->vc_top = 0;
 930         vc->vc_bottom = vc->vc_rows;
 931         gotoxy(vc, vc->vc_x, vc->vc_y);
 932         save_cur(vc);
 933
 934         if (tty) {
 935                 /* Rewrite the requested winsize data with the actual
 936                    resulting sizes */
 937                 struct winsize ws;
 938                 memset(&ws, 0, sizeof(ws));
 939                 ws.ws_row = vc->vc_rows;
 940                 ws.ws_col = vc->vc_cols;
 941                 ws.ws_ypixel = vc->vc_scan_lines;
 942                 tty_do_resize(tty, &ws);
 943         }
 944
 945         if (con_is_visible(vc))
 946                 update_screen(vc);
 947         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 948         return err;
 949 }
 950
 951 /**
 952  *      vc_resize               -       resize a VT
 953  *      @vc: virtual console
 954  *      @cols: columns
 955  *      @rows: rows
 956  *
 957  *      Resize a virtual console as seen from the console end of things. We
 958  *      use the common vc_do_resize methods to update the structures. The
 959  *      caller must hold the console sem to protect console internals and
 960  *      vc->port.tty
 961  */
 962
 963 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 964 {
 965         return vc_do_resize(vc->port.tty, vc, cols, rows);
 966 }
 967
 968 /**
 969  *      vt_resize               -       resize a VT
 970  *      @tty: tty to resize
 971  *      @ws: winsize attributes
 972  *
 973  *      Resize a virtual terminal. This is called by the tty layer as we
 974  *      register our own handler for resizing. The mutual helper does all
 975  *      the actual work.
 976  *
 977  *      Takes the console sem and the called methods then take the tty
 978  *      termios_rwsem and the tty ctrl_lock in that order.
 979  */
 980 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 981 {
 982         struct vc_data *vc = tty->driver_data;
 983         int ret;
 984
 985         console_lock();
 986         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 987         console_unlock();
 988         return ret;
 989 }
 990
 991 struct vc_data *vc_deallocate(unsigned int currcons)
 992 {
 993         struct vc_data *vc = NULL;
 994
 995         WARN_CONSOLE_UNLOCKED();
 996
 997         if (vc_cons_allocated(currcons)) {
 998                 struct vt_notifier_param param;
 999
1000                 param.vc = vc = vc_cons[currcons].d;
1001                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1002                 vcs_remove_sysfs(currcons);
1003                 vc->vc_sw->con_deinit(vc);
1004                 put_pid(vc->vt_pid);
1005                 module_put(vc->vc_sw->owner);
1006                 kfree(vc->vc_screenbuf);
1007                 vc_cons[currcons].d = NULL;
1008         }
1009         return vc;
1010 }
1011
1012 /*
1013  *      VT102 emulator
1014  */
1015
1016 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1017 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1018 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1019
1020 #define decarm          VC_REPEAT
1021 #define decckm          VC_CKMODE
1022 #define kbdapplic       VC_APPLIC
1023 #define lnm             VC_CRLF
1024
1025 /*
1026  * this is what the terminal answers to a ESC-Z or csi0c query.
1027  */
1028 #define VT100ID "\033[?1;2c"
1029 #define VT102ID "\033[?6c"
1030
1031 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1032                                        8,12,10,14, 9,13,11,15 };
1033
1034 /* the default colour table, for VGA+ colour systems */
1035 unsigned char default_red[] = {
1036         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1037         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1038 };
1039 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1040
1041 unsigned char default_grn[] = {
1042         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1043         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1044 };
1045 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1046
1047 unsigned char default_blu[] = {
1048         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1049         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1050 };
1051 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1052
1053 /*
1054  * gotoxy() must verify all boundaries, because the arguments
1055  * might also be negative. If the given position is out of
1056  * bounds, the cursor is placed at the nearest margin.
1057  */
1058 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1059 {
1060         int min_y, max_y;
1061
1062         if (new_x < 0)
1063                 vc->vc_x = 0;
1064         else {
1065                 if (new_x >= vc->vc_cols)
1066                         vc->vc_x = vc->vc_cols - 1;
1067                 else
1068                         vc->vc_x = new_x;
1069         }
1070
1071         if (vc->vc_decom) {
1072                 min_y = vc->vc_top;
1073                 max_y = vc->vc_bottom;
1074         } else {
1075                 min_y = 0;
1076                 max_y = vc->vc_rows;
1077         }
1078         if (new_y < min_y)
1079                 vc->vc_y = min_y;
1080         else if (new_y >= max_y)
1081                 vc->vc_y = max_y - 1;
1082         else
1083                 vc->vc_y = new_y;
1084         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1085         vc->vc_need_wrap = 0;
1086 }
1087
1088 /* for absolute user moves, when decom is set */
1089 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1090 {
1091         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1092 }
1093
1094 void scrollback(struct vc_data *vc)
1095 {
1096         scrolldelta(-(vc->vc_rows / 2));
1097 }
1098
1099 void scrollfront(struct vc_data *vc, int lines)
1100 {
1101         if (!lines)
1102                 lines = vc->vc_rows / 2;
1103         scrolldelta(lines);
1104 }
1105
1106 static void lf(struct vc_data *vc)
1107 {
1108         /* don't scroll if above bottom of scrolling region, or
1109          * if below scrolling region
1110          */
1111         if (vc->vc_y + 1 == vc->vc_bottom)
1112                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1113         else if (vc->vc_y < vc->vc_rows - 1) {
1114                 vc->vc_y++;
1115                 vc->vc_pos += vc->vc_size_row;
1116         }
1117         vc->vc_need_wrap = 0;
1118         notify_write(vc, '\n');
1119 }
1120
1121 static void ri(struct vc_data *vc)
1122 {
1123         /* don't scroll if below top of scrolling region, or
1124          * if above scrolling region
1125          */
1126         if (vc->vc_y == vc->vc_top)
1127                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1128         else if (vc->vc_y > 0) {
1129                 vc->vc_y--;
1130                 vc->vc_pos -= vc->vc_size_row;
1131         }
1132         vc->vc_need_wrap = 0;
1133 }
1134
1135 static inline void cr(struct vc_data *vc)
1136 {
1137         vc->vc_pos -= vc->vc_x << 1;
1138         vc->vc_need_wrap = vc->vc_x = 0;
1139         notify_write(vc, '\r');
1140 }
1141
1142 static inline void bs(struct vc_data *vc)
1143 {
1144         if (vc->vc_x) {
1145                 vc->vc_pos -= 2;
1146                 vc->vc_x--;
1147                 vc->vc_need_wrap = 0;
1148                 notify_write(vc, '\b');
1149         }
1150 }
1151
1152 static inline void del(struct vc_data *vc)
1153 {
1154         /* ignored */
1155 }
1156
1157 static void csi_J(struct vc_data *vc, int vpar)
1158 {
1159         unsigned int count;
1160         unsigned short * start;
1161
1162         switch (vpar) {
1163                 case 0: /* erase from cursor to end of display */
1164                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1165                         start = (unsigned short *)vc->vc_pos;
1166                         break;
1167                 case 1: /* erase from start to cursor */
1168                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1169                         start = (unsigned short *)vc->vc_origin;
1170                         break;
1171                 case 3: /* erase scroll-back buffer (and whole display) */
1172                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1173                                     vc->vc_screenbuf_size);
1174                         set_origin(vc);
1175                         if (con_is_visible(vc))
1176                                 update_screen(vc);
1177                         /* fall through */
1178                 case 2: /* erase whole display */
1179                         count = vc->vc_cols * vc->vc_rows;
1180                         start = (unsigned short *)vc->vc_origin;
1181                         break;
1182                 default:
1183                         return;
1184         }
1185         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1186         if (con_should_update(vc))
1187                 do_update_region(vc, (unsigned long) start, count);
1188         vc->vc_need_wrap = 0;
1189 }
1190
1191 static void csi_K(struct vc_data *vc, int vpar)
1192 {
1193         unsigned int count;
1194         unsigned short * start;
1195
1196         switch (vpar) {
1197                 case 0: /* erase from cursor to end of line */
1198                         count = vc->vc_cols - vc->vc_x;
1199                         start = (unsigned short *)vc->vc_pos;
1200                         break;
1201                 case 1: /* erase from start of line to cursor */
1202                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1203                         count = vc->vc_x + 1;
1204                         break;
1205                 case 2: /* erase whole line */
1206                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1207                         count = vc->vc_cols;
1208                         break;
1209                 default:
1210                         return;
1211         }
1212         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1213         vc->vc_need_wrap = 0;
1214         if (con_should_update(vc))
1215                 do_update_region(vc, (unsigned long) start, count);
1216 }
1217
1218 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1219 {                                         /* not vt100? */
1220         int count;
1221
1222         if (!vpar)
1223                 vpar++;
1224         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1225
1226         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1227         if (con_should_update(vc))
1228                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1229         vc->vc_need_wrap = 0;
1230 }
1231
1232 static void default_attr(struct vc_data *vc)
1233 {
1234         vc->vc_intensity = 1;
1235         vc->vc_italic = 0;
1236         vc->vc_underline = 0;
1237         vc->vc_reverse = 0;
1238         vc->vc_blink = 0;
1239         vc->vc_color = vc->vc_def_color;
1240 }
1241
1242 struct rgb { u8 r; u8 g; u8 b; };
1243
1244 static void rgb_from_256(int i, struct rgb *c)
1245 {
1246         if (i < 8) {            /* Standard colours. */
1247                 c->r = i&1 ? 0xaa : 0x00;
1248                 c->g = i&2 ? 0xaa : 0x00;
1249                 c->b = i&4 ? 0xaa : 0x00;
1250         } else if (i < 16) {
1251                 c->r = i&1 ? 0xff : 0x55;
1252                 c->g = i&2 ? 0xff : 0x55;
1253                 c->b = i&4 ? 0xff : 0x55;
1254         } else if (i < 232) {   /* 6x6x6 colour cube. */
1255                 c->r = (i - 16) / 36 * 85 / 2;
1256                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1257                 c->b = (i - 16) % 6 * 85 / 2;
1258         } else                  /* Grayscale ramp. */
1259                 c->r = c->g = c->b = i * 10 - 2312;
1260 }
1261
1262 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1263 {
1264         u8 hue = 0, max = max3(c->r, c->g, c->b);
1265
1266         if (c->r > max / 2)
1267                 hue |= 4;
1268         if (c->g > max / 2)
1269                 hue |= 2;
1270         if (c->b > max / 2)
1271                 hue |= 1;
1272
1273         if (hue == 7 && max <= 0x55) {
1274                 hue = 0;
1275                 vc->vc_intensity = 2;
1276         } else if (max > 0xaa)
1277                 vc->vc_intensity = 2;
1278         else
1279                 vc->vc_intensity = 1;
1280
1281         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1282 }
1283
1284 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1285 {
1286         /* For backgrounds, err on the dark side. */
1287         vc->vc_color = (vc->vc_color & 0x0f)
1288                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1289 }
1290
1291 /*
1292  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1293  * and thus need to be detected and ignored by hand. Strictly speaking, that
1294  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1295  * no one produces such codes and almost no one accepts them.
1296  *
1297  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1298  * supporting them.
1299  */
1300 static int vc_t416_color(struct vc_data *vc, int i,
1301                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1302 {
1303         struct rgb c;
1304
1305         i++;
1306         if (i > vc->vc_npar)
1307                 return i;
1308
1309         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1310                 /* 256 colours */
1311                 i++;
1312                 rgb_from_256(vc->vc_par[i], &c);
1313         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1314                 /* 24 bit */
1315                 c.r = vc->vc_par[i + 1];
1316                 c.g = vc->vc_par[i + 2];
1317                 c.b = vc->vc_par[i + 3];
1318                 i += 3;
1319         } else
1320                 return i;
1321
1322         set_color(vc, &c);
1323
1324         return i;
1325 }
1326
1327 /* console_lock is held */
1328 static void csi_m(struct vc_data *vc)
1329 {
1330         int i;
1331
1332         for (i = 0; i <= vc->vc_npar; i++)
1333                 switch (vc->vc_par[i]) {
1334                 case 0: /* all attributes off */
1335                         default_attr(vc);
1336                         break;
1337                 case 1:
1338                         vc->vc_intensity = 2;
1339                         break;
1340                 case 2:
1341                         vc->vc_intensity = 0;
1342                         break;
1343                 case 3:
1344                         vc->vc_italic = 1;
1345                         break;
1346                 case 4:
1347                         vc->vc_underline = 1;
1348                         break;
1349                 case 5:
1350                         vc->vc_blink = 1;
1351                         break;
1352                 case 7:
1353                         vc->vc_reverse = 1;
1354                         break;
1355                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1356                           * Select primary font, don't display control chars if
1357                           * defined, don't set bit 8 on output.
1358                           */
1359                         vc->vc_translate = set_translate(vc->vc_charset == 0
1360                                         ? vc->vc_G0_charset
1361                                         : vc->vc_G1_charset, vc);
1362                         vc->vc_disp_ctrl = 0;
1363                         vc->vc_toggle_meta = 0;
1364                         break;
1365                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1366                           * Select first alternate font, lets chars < 32 be
1367                           * displayed as ROM chars.
1368                           */
1369                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1370                         vc->vc_disp_ctrl = 1;
1371                         vc->vc_toggle_meta = 0;
1372                         break;
1373                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1374                           * Select second alternate font, toggle high bit
1375                           * before displaying as ROM char.
1376                           */
1377                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1378                         vc->vc_disp_ctrl = 1;
1379                         vc->vc_toggle_meta = 1;
1380                         break;
1381                 case 21:
1382                 case 22:
1383                         vc->vc_intensity = 1;
1384                         break;
1385                 case 23:
1386                         vc->vc_italic = 0;
1387                         break;
1388                 case 24:
1389                         vc->vc_underline = 0;
1390                         break;
1391                 case 25:
1392                         vc->vc_blink = 0;
1393                         break;
1394                 case 27:
1395                         vc->vc_reverse = 0;
1396                         break;
1397                 case 38:
1398                         i = vc_t416_color(vc, i, rgb_foreground);
1399                         break;
1400                 case 48:
1401                         i = vc_t416_color(vc, i, rgb_background);
1402                         break;
1403                 case 39:
1404                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1405                                 (vc->vc_color & 0xf0);
1406                         break;
1407                 case 49:
1408                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1409                                 (vc->vc_color & 0x0f);
1410                         break;
1411                 default:
1412                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1413                                 if (vc->vc_par[i] < 100)
1414                                         vc->vc_intensity = 2;
1415                                 vc->vc_par[i] -= 60;
1416                         }
1417                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1418                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1419                                         | (vc->vc_color & 0xf0);
1420                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1421                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1422                                         | (vc->vc_color & 0x0f);
1423                         break;
1424                 }
1425         update_attr(vc);
1426 }
1427
1428 static void respond_string(const char *p, struct tty_port *port)
1429 {
1430         while (*p) {
1431                 tty_insert_flip_char(port, *p, 0);
1432                 p++;
1433         }
1434         tty_schedule_flip(port);
1435 }
1436
1437 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1438 {
1439         char buf[40];
1440
1441         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1442         respond_string(buf, tty->port);
1443 }
1444
1445 static inline void status_report(struct tty_struct *tty)
1446 {
1447         respond_string("\033[0n", tty->port);   /* Terminal ok */
1448 }
1449
1450 static inline void respond_ID(struct tty_struct *tty)
1451 {
1452         respond_string(VT102ID, tty->port);
1453 }
1454
1455 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1456 {
1457         char buf[8];
1458
1459         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1460                 (char)('!' + mry));
1461         respond_string(buf, tty->port);
1462 }
1463
1464 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1465 int mouse_reporting(void)
1466 {
1467         return vc_cons[fg_console].d->vc_report_mouse;
1468 }
1469
1470 /* console_lock is held */
1471 static void set_mode(struct vc_data *vc, int on_off)
1472 {
1473         int i;
1474
1475         for (i = 0; i <= vc->vc_npar; i++)
1476                 if (vc->vc_ques) {
1477                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1478                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1479                                 if (on_off)
1480                                         set_kbd(vc, decckm);
1481                                 else
1482                                         clr_kbd(vc, decckm);
1483                                 break;
1484                         case 3: /* 80/132 mode switch unimplemented */
1485 #if 0
1486                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1487                                 /* this alone does not suffice; some user mode
1488                                    utility has to change the hardware regs */
1489 #endif
1490                                 break;
1491                         case 5:                 /* Inverted screen on/off */
1492                                 if (vc->vc_decscnm != on_off) {
1493                                         vc->vc_decscnm = on_off;
1494                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1495                                         update_attr(vc);
1496                                 }
1497                                 break;
1498                         case 6:                 /* Origin relative/absolute */
1499                                 vc->vc_decom = on_off;
1500                                 gotoxay(vc, 0, 0);
1501                                 break;
1502                         case 7:                 /* Autowrap on/off */
1503                                 vc->vc_decawm = on_off;
1504                                 break;
1505                         case 8:                 /* Autorepeat on/off */
1506                                 if (on_off)
1507                                         set_kbd(vc, decarm);
1508                                 else
1509                                         clr_kbd(vc, decarm);
1510                                 break;
1511                         case 9:
1512                                 vc->vc_report_mouse = on_off ? 1 : 0;
1513                                 break;
1514                         case 25:                /* Cursor on/off */
1515                                 vc->vc_deccm = on_off;
1516                                 break;
1517                         case 1000:
1518                                 vc->vc_report_mouse = on_off ? 2 : 0;
1519                                 break;
1520                         }
1521                 } else {
1522                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1523                         case 3:                 /* Monitor (display ctrls) */
1524                                 vc->vc_disp_ctrl = on_off;
1525                                 break;
1526                         case 4:                 /* Insert Mode on/off */
1527                                 vc->vc_decim = on_off;
1528                                 break;
1529                         case 20:                /* Lf, Enter == CrLf/Lf */
1530                                 if (on_off)
1531                                         set_kbd(vc, lnm);
1532                                 else
1533                                         clr_kbd(vc, lnm);
1534                                 break;
1535                         }
1536                 }
1537 }
1538
1539 /* console_lock is held */
1540 static void setterm_command(struct vc_data *vc)
1541 {
1542         switch(vc->vc_par[0]) {
1543                 case 1: /* set color for underline mode */
1544                         if (vc->vc_can_do_color &&
1545                                         vc->vc_par[1] < 16) {
1546                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1547                                 if (vc->vc_underline)
1548                                         update_attr(vc);
1549                         }
1550                         break;
1551                 case 2: /* set color for half intensity mode */
1552                         if (vc->vc_can_do_color &&
1553                                         vc->vc_par[1] < 16) {
1554                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1555                                 if (vc->vc_intensity == 0)
1556                                         update_attr(vc);
1557                         }
1558                         break;
1559                 case 8: /* store colors as defaults */
1560                         vc->vc_def_color = vc->vc_attr;
1561                         if (vc->vc_hi_font_mask == 0x100)
1562                                 vc->vc_def_color >>= 1;
1563                         default_attr(vc);
1564                         update_attr(vc);
1565                         break;
1566                 case 9: /* set blanking interval */
1567                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1568                         poke_blanked_console();
1569                         break;
1570                 case 10: /* set bell frequency in Hz */
1571                         if (vc->vc_npar >= 1)
1572                                 vc->vc_bell_pitch = vc->vc_par[1];
1573                         else
1574                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1575                         break;
1576                 case 11: /* set bell duration in msec */
1577                         if (vc->vc_npar >= 1)
1578                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1579                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1580                         else
1581                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1582                         break;
1583                 case 12: /* bring specified console to the front */
1584                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1585                                 set_console(vc->vc_par[1] - 1);
1586                         break;
1587                 case 13: /* unblank the screen */
1588                         poke_blanked_console();
1589                         break;
1590                 case 14: /* set vesa powerdown interval */
1591                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1592                         break;
1593                 case 15: /* activate the previous console */
1594                         set_console(last_console);
1595                         break;
1596                 case 16: /* set cursor blink duration in msec */
1597                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1598                                         vc->vc_par[1] <= USHRT_MAX)
1599                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1600                         else
1601                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1602                         break;
1603         }
1604 }
1605
1606 /* console_lock is held */
1607 static void csi_at(struct vc_data *vc, unsigned int nr)
1608 {
1609         if (nr > vc->vc_cols - vc->vc_x)
1610                 nr = vc->vc_cols - vc->vc_x;
1611         else if (!nr)
1612                 nr = 1;
1613         insert_char(vc, nr);
1614 }
1615
1616 /* console_lock is held */
1617 static void csi_L(struct vc_data *vc, unsigned int nr)
1618 {
1619         if (nr > vc->vc_rows - vc->vc_y)
1620                 nr = vc->vc_rows - vc->vc_y;
1621         else if (!nr)
1622                 nr = 1;
1623         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1624         vc->vc_need_wrap = 0;
1625 }
1626
1627 /* console_lock is held */
1628 static void csi_P(struct vc_data *vc, unsigned int nr)
1629 {
1630         if (nr > vc->vc_cols - vc->vc_x)
1631                 nr = vc->vc_cols - vc->vc_x;
1632         else if (!nr)
1633                 nr = 1;
1634         delete_char(vc, nr);
1635 }
1636
1637 /* console_lock is held */
1638 static void csi_M(struct vc_data *vc, unsigned int nr)
1639 {
1640         if (nr > vc->vc_rows - vc->vc_y)
1641                 nr = vc->vc_rows - vc->vc_y;
1642         else if (!nr)
1643                 nr=1;
1644         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1645         vc->vc_need_wrap = 0;
1646 }
1647
1648 /* console_lock is held (except via vc_init->reset_terminal */
1649 static void save_cur(struct vc_data *vc)
1650 {
1651         vc->vc_saved_x          = vc->vc_x;
1652         vc->vc_saved_y          = vc->vc_y;
1653         vc->vc_s_intensity      = vc->vc_intensity;
1654         vc->vc_s_italic         = vc->vc_italic;
1655         vc->vc_s_underline      = vc->vc_underline;
1656         vc->vc_s_blink          = vc->vc_blink;
1657         vc->vc_s_reverse        = vc->vc_reverse;
1658         vc->vc_s_charset        = vc->vc_charset;
1659         vc->vc_s_color          = vc->vc_color;
1660         vc->vc_saved_G0         = vc->vc_G0_charset;
1661         vc->vc_saved_G1         = vc->vc_G1_charset;
1662 }
1663
1664 /* console_lock is held */
1665 static void restore_cur(struct vc_data *vc)
1666 {
1667         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1668         vc->vc_intensity        = vc->vc_s_intensity;
1669         vc->vc_italic           = vc->vc_s_italic;
1670         vc->vc_underline        = vc->vc_s_underline;
1671         vc->vc_blink            = vc->vc_s_blink;
1672         vc->vc_reverse          = vc->vc_s_reverse;
1673         vc->vc_charset          = vc->vc_s_charset;
1674         vc->vc_color            = vc->vc_s_color;
1675         vc->vc_G0_charset       = vc->vc_saved_G0;
1676         vc->vc_G1_charset       = vc->vc_saved_G1;
1677         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1678         update_attr(vc);
1679         vc->vc_need_wrap = 0;
1680 }
1681
1682 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1683         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1684         ESpalette, ESosc };
1685
1686 /* console_lock is held (except via vc_init()) */
1687 static void reset_terminal(struct vc_data *vc, int do_clear)
1688 {
1689         vc->vc_top              = 0;
1690         vc->vc_bottom           = vc->vc_rows;
1691         vc->vc_state            = ESnormal;
1692         vc->vc_ques             = 0;
1693         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1694         vc->vc_G0_charset       = LAT1_MAP;
1695         vc->vc_G1_charset       = GRAF_MAP;
1696         vc->vc_charset          = 0;
1697         vc->vc_need_wrap        = 0;
1698         vc->vc_report_mouse     = 0;
1699         vc->vc_utf              = default_utf8;
1700         vc->vc_utf_count        = 0;
1701
1702         vc->vc_disp_ctrl        = 0;
1703         vc->vc_toggle_meta      = 0;
1704
1705         vc->vc_decscnm          = 0;
1706         vc->vc_decom            = 0;
1707         vc->vc_decawm           = 1;
1708         vc->vc_deccm            = global_cursor_default;
1709         vc->vc_decim            = 0;
1710
1711         vt_reset_keyboard(vc->vc_num);
1712
1713         vc->vc_cursor_type = cur_default;
1714         vc->vc_complement_mask = vc->vc_s_complement_mask;
1715
1716         default_attr(vc);
1717         update_attr(vc);
1718
1719         vc->vc_tab_stop[0]      = 0x01010100;
1720         vc->vc_tab_stop[1]      =
1721         vc->vc_tab_stop[2]      =
1722         vc->vc_tab_stop[3]      =
1723         vc->vc_tab_stop[4]      =
1724         vc->vc_tab_stop[5]      =
1725         vc->vc_tab_stop[6]      =
1726         vc->vc_tab_stop[7]      = 0x01010101;
1727
1728         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1729         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1730         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1731
1732         gotoxy(vc, 0, 0);
1733         save_cur(vc);
1734         if (do_clear)
1735             csi_J(vc, 2);
1736 }
1737
1738 /* console_lock is held */
1739 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1740 {
1741         /*
1742          *  Control characters can be used in the _middle_
1743          *  of an escape sequence.
1744          */
1745         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1746                 return;
1747         switch (c) {
1748         case 0:
1749                 return;
1750         case 7:
1751                 if (vc->vc_state == ESosc)
1752                         vc->vc_state = ESnormal;
1753                 else if (vc->vc_bell_duration)
1754                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1755                 return;
1756         case 8:
1757                 bs(vc);
1758                 return;
1759         case 9:
1760                 vc->vc_pos -= (vc->vc_x << 1);
1761                 while (vc->vc_x < vc->vc_cols - 1) {
1762                         vc->vc_x++;
1763                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1764                                 break;
1765                 }
1766                 vc->vc_pos += (vc->vc_x << 1);
1767                 notify_write(vc, '\t');
1768                 return;
1769         case 10: case 11: case 12:
1770                 lf(vc);
1771                 if (!is_kbd(vc, lnm))
1772                         return;
1773         case 13:
1774                 cr(vc);
1775                 return;
1776         case 14:
1777                 vc->vc_charset = 1;
1778                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1779                 vc->vc_disp_ctrl = 1;
1780                 return;
1781         case 15:
1782                 vc->vc_charset = 0;
1783                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1784                 vc->vc_disp_ctrl = 0;
1785                 return;
1786         case 24: case 26:
1787                 vc->vc_state = ESnormal;
1788                 return;
1789         case 27:
1790                 vc->vc_state = ESesc;
1791                 return;
1792         case 127:
1793                 del(vc);
1794                 return;
1795         case 128+27:
1796                 vc->vc_state = ESsquare;
1797                 return;
1798         }
1799         switch(vc->vc_state) {
1800         case ESesc:
1801                 vc->vc_state = ESnormal;
1802                 switch (c) {
1803                 case '[':
1804                         vc->vc_state = ESsquare;
1805                         return;
1806                 case ']':
1807                         vc->vc_state = ESnonstd;
1808                         return;
1809                 case '%':
1810                         vc->vc_state = ESpercent;
1811                         return;
1812                 case 'E':
1813                         cr(vc);
1814                         lf(vc);
1815                         return;
1816                 case 'M':
1817                         ri(vc);
1818                         return;
1819                 case 'D':
1820                         lf(vc);
1821                         return;
1822                 case 'H':
1823                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1824                         return;
1825                 case 'Z':
1826                         respond_ID(tty);
1827                         return;
1828                 case '7':
1829                         save_cur(vc);
1830                         return;
1831                 case '8':
1832                         restore_cur(vc);
1833                         return;
1834                 case '(':
1835                         vc->vc_state = ESsetG0;
1836                         return;
1837                 case ')':
1838                         vc->vc_state = ESsetG1;
1839                         return;
1840                 case '#':
1841                         vc->vc_state = EShash;
1842                         return;
1843                 case 'c':
1844                         reset_terminal(vc, 1);
1845                         return;
1846                 case '>':  /* Numeric keypad */
1847                         clr_kbd(vc, kbdapplic);
1848                         return;
1849                 case '=':  /* Appl. keypad */
1850                         set_kbd(vc, kbdapplic);
1851                         return;
1852                 }
1853                 return;
1854         case ESnonstd:
1855                 if (c=='P') {   /* palette escape sequence */
1856                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1857                                 vc->vc_par[vc->vc_npar] = 0;
1858                         vc->vc_npar = 0;
1859                         vc->vc_state = ESpalette;
1860                         return;
1861                 } else if (c=='R') {   /* reset palette */
1862                         reset_palette(vc);
1863                         vc->vc_state = ESnormal;
1864                 } else if (c>='0' && c<='9')
1865                         vc->vc_state = ESosc;
1866                 else
1867                         vc->vc_state = ESnormal;
1868                 return;
1869         case ESpalette:
1870                 if (isxdigit(c)) {
1871                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1872                         if (vc->vc_npar == 7) {
1873                                 int i = vc->vc_par[0] * 3, j = 1;
1874                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1875                                 vc->vc_palette[i++] += vc->vc_par[j++];
1876                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1877                                 vc->vc_palette[i++] += vc->vc_par[j++];
1878                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1879                                 vc->vc_palette[i] += vc->vc_par[j];
1880                                 set_palette(vc);
1881                                 vc->vc_state = ESnormal;
1882                         }
1883                 } else
1884                         vc->vc_state = ESnormal;
1885                 return;
1886         case ESsquare:
1887                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1888                         vc->vc_par[vc->vc_npar] = 0;
1889                 vc->vc_npar = 0;
1890                 vc->vc_state = ESgetpars;
1891                 if (c == '[') { /* Function key */
1892                         vc->vc_state=ESfunckey;
1893                         return;
1894                 }
1895                 vc->vc_ques = (c == '?');
1896                 if (vc->vc_ques)
1897                         return;
1898         case ESgetpars:
1899                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1900                         vc->vc_npar++;
1901                         return;
1902                 } else if (c>='0' && c<='9') {
1903                         vc->vc_par[vc->vc_npar] *= 10;
1904                         vc->vc_par[vc->vc_npar] += c - '0';
1905                         return;
1906                 }
1907                 vc->vc_state = ESnormal;
1908                 switch(c) {
1909                 case 'h':
1910                         set_mode(vc, 1);
1911                         return;
1912                 case 'l':
1913                         set_mode(vc, 0);
1914                         return;
1915                 case 'c':
1916                         if (vc->vc_ques) {
1917                                 if (vc->vc_par[0])
1918                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1919                                 else
1920                                         vc->vc_cursor_type = cur_default;
1921                                 return;
1922                         }
1923                         break;
1924                 case 'm':
1925                         if (vc->vc_ques) {
1926                                 clear_selection();
1927                                 if (vc->vc_par[0])
1928                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1929                                 else
1930                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1931                                 return;
1932                         }
1933                         break;
1934                 case 'n':
1935                         if (!vc->vc_ques) {
1936                                 if (vc->vc_par[0] == 5)
1937                                         status_report(tty);
1938                                 else if (vc->vc_par[0] == 6)
1939                                         cursor_report(vc, tty);
1940                         }
1941                         return;
1942                 }
1943                 if (vc->vc_ques) {
1944                         vc->vc_ques = 0;
1945                         return;
1946                 }
1947                 switch(c) {
1948                 case 'G': case '`':
1949                         if (vc->vc_par[0])
1950                                 vc->vc_par[0]--;
1951                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1952                         return;
1953                 case 'A':
1954                         if (!vc->vc_par[0])
1955                                 vc->vc_par[0]++;
1956                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1957                         return;
1958                 case 'B': case 'e':
1959                         if (!vc->vc_par[0])
1960                                 vc->vc_par[0]++;
1961                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1962                         return;
1963                 case 'C': case 'a':
1964                         if (!vc->vc_par[0])
1965                                 vc->vc_par[0]++;
1966                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1967                         return;
1968                 case 'D':
1969                         if (!vc->vc_par[0])
1970                                 vc->vc_par[0]++;
1971                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1972                         return;
1973                 case 'E':
1974                         if (!vc->vc_par[0])
1975                                 vc->vc_par[0]++;
1976                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1977                         return;
1978                 case 'F':
1979                         if (!vc->vc_par[0])
1980                                 vc->vc_par[0]++;
1981                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1982                         return;
1983                 case 'd':
1984                         if (vc->vc_par[0])
1985                                 vc->vc_par[0]--;
1986                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1987                         return;
1988                 case 'H': case 'f':
1989                         if (vc->vc_par[0])
1990                                 vc->vc_par[0]--;
1991                         if (vc->vc_par[1])
1992                                 vc->vc_par[1]--;
1993                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1994                         return;
1995                 case 'J':
1996                         csi_J(vc, vc->vc_par[0]);
1997                         return;
1998                 case 'K':
1999                         csi_K(vc, vc->vc_par[0]);
2000                         return;
2001                 case 'L':
2002                         csi_L(vc, vc->vc_par[0]);
2003                         return;
2004                 case 'M':
2005                         csi_M(vc, vc->vc_par[0]);
2006                         return;
2007                 case 'P':
2008                         csi_P(vc, vc->vc_par[0]);
2009                         return;
2010                 case 'c':
2011                         if (!vc->vc_par[0])
2012                                 respond_ID(tty);
2013                         return;
2014                 case 'g':
2015                         if (!vc->vc_par[0])
2016                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2017                         else if (vc->vc_par[0] == 3) {
2018                                 vc->vc_tab_stop[0] =
2019                                         vc->vc_tab_stop[1] =
2020                                         vc->vc_tab_stop[2] =
2021                                         vc->vc_tab_stop[3] =
2022                                         vc->vc_tab_stop[4] =
2023                                         vc->vc_tab_stop[5] =
2024                                         vc->vc_tab_stop[6] =
2025                                         vc->vc_tab_stop[7] = 0;
2026                         }
2027                         return;
2028                 case 'm':
2029                         csi_m(vc);
2030                         return;
2031                 case 'q': /* DECLL - but only 3 leds */
2032                         /* map 0,1,2,3 to 0,1,2,4 */
2033                         if (vc->vc_par[0] < 4)
2034                                 vt_set_led_state(vc->vc_num,
2035                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2036                         return;
2037                 case 'r':
2038                         if (!vc->vc_par[0])
2039                                 vc->vc_par[0]++;
2040                         if (!vc->vc_par[1])
2041                                 vc->vc_par[1] = vc->vc_rows;
2042                         /* Minimum allowed region is 2 lines */
2043                         if (vc->vc_par[0] < vc->vc_par[1] &&
2044                             vc->vc_par[1] <= vc->vc_rows) {
2045                                 vc->vc_top = vc->vc_par[0] - 1;
2046                                 vc->vc_bottom = vc->vc_par[1];
2047                                 gotoxay(vc, 0, 0);
2048                         }
2049                         return;
2050                 case 's':
2051                         save_cur(vc);
2052                         return;
2053                 case 'u':
2054                         restore_cur(vc);
2055                         return;
2056                 case 'X':
2057                         csi_X(vc, vc->vc_par[0]);
2058                         return;
2059                 case '@':
2060                         csi_at(vc, vc->vc_par[0]);
2061                         return;
2062                 case ']': /* setterm functions */
2063                         setterm_command(vc);
2064                         return;
2065                 }
2066                 return;
2067         case ESpercent:
2068                 vc->vc_state = ESnormal;
2069                 switch (c) {
2070                 case '@':  /* defined in ISO 2022 */
2071                         vc->vc_utf = 0;
2072                         return;
2073                 case 'G':  /* prelim official escape code */
2074                 case '8':  /* retained for compatibility */
2075                         vc->vc_utf = 1;
2076                         return;
2077                 }
2078                 return;
2079         case ESfunckey:
2080                 vc->vc_state = ESnormal;
2081                 return;
2082         case EShash:
2083                 vc->vc_state = ESnormal;
2084                 if (c == '8') {
2085                         /* DEC screen alignment test. kludge :-) */
2086                         vc->vc_video_erase_char =
2087                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2088                         csi_J(vc, 2);
2089                         vc->vc_video_erase_char =
2090                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2091                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2092                 }
2093                 return;
2094         case ESsetG0:
2095                 if (c == '0')
2096                         vc->vc_G0_charset = GRAF_MAP;
2097                 else if (c == 'B')
2098                         vc->vc_G0_charset = LAT1_MAP;
2099                 else if (c == 'U')
2100                         vc->vc_G0_charset = IBMPC_MAP;
2101                 else if (c == 'K')
2102                         vc->vc_G0_charset = USER_MAP;
2103                 if (vc->vc_charset == 0)
2104                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2105                 vc->vc_state = ESnormal;
2106                 return;
2107         case ESsetG1:
2108                 if (c == '0')
2109                         vc->vc_G1_charset = GRAF_MAP;
2110                 else if (c == 'B')
2111                         vc->vc_G1_charset = LAT1_MAP;
2112                 else if (c == 'U')
2113                         vc->vc_G1_charset = IBMPC_MAP;
2114                 else if (c == 'K')
2115                         vc->vc_G1_charset = USER_MAP;
2116                 if (vc->vc_charset == 1)
2117                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2118                 vc->vc_state = ESnormal;
2119                 return;
2120         case ESosc:
2121                 return;
2122         default:
2123                 vc->vc_state = ESnormal;
2124         }
2125 }
2126
2127 /* is_double_width() is based on the wcwidth() implementation by
2128  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2129  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2130  */
2131 struct interval {
2132         uint32_t first;
2133         uint32_t last;
2134 };
2135
2136 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2137 {
2138         int min = 0;
2139         int mid;
2140
2141         if (ucs < table[0].first || ucs > table[max].last)
2142                 return 0;
2143         while (max >= min) {
2144                 mid = (min + max) / 2;
2145                 if (ucs > table[mid].last)
2146                         min = mid + 1;
2147                 else if (ucs < table[mid].first)
2148                         max = mid - 1;
2149                 else
2150                         return 1;
2151         }
2152         return 0;
2153 }
2154
2155 static int is_double_width(uint32_t ucs)
2156 {
2157         static const struct interval double_width[] = {
2158                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2159                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2160                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2161                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2162         };
2163         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2164 }
2165
2166 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2167                 unsigned long draw_to, int *draw_x)
2168 {
2169         if (*draw_x < 0)
2170                 return;
2171
2172         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2173                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2174         *draw_x = -1;
2175 }
2176
2177 /* acquires console_lock */
2178 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2179 {
2180         int c, tc, ok, n = 0, draw_x = -1;
2181         unsigned int currcons;
2182         unsigned long draw_from = 0, draw_to = 0;
2183         struct vc_data *vc;
2184         unsigned char vc_attr;
2185         struct vt_notifier_param param;
2186         uint8_t rescan;
2187         uint8_t inverse;
2188         uint8_t width;
2189         u16 himask, charmask;
2190
2191         if (in_interrupt())
2192                 return count;
2193
2194         might_sleep();
2195
2196         console_lock();
2197         vc = tty->driver_data;
2198         if (vc == NULL) {
2199                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2200                 console_unlock();
2201                 return 0;
2202         }
2203
2204         currcons = vc->vc_num;
2205         if (!vc_cons_allocated(currcons)) {
2206                 /* could this happen? */
2207                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2208                 console_unlock();
2209                 return 0;
2210         }
2211
2212         himask = vc->vc_hi_font_mask;
2213         charmask = himask ? 0x1ff : 0xff;
2214
2215         /* undraw cursor first */
2216         if (con_is_fg(vc))
2217                 hide_cursor(vc);
2218
2219         param.vc = vc;
2220
2221         while (!tty->stopped && count) {
2222                 int orig = *buf;
2223                 c = orig;
2224                 buf++;
2225                 n++;
2226                 count--;
2227                 rescan = 0;
2228                 inverse = 0;
2229                 width = 1;
2230
2231                 /* Do no translation at all in control states */
2232                 if (vc->vc_state != ESnormal) {
2233                         tc = c;
2234                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2235                     /* Combine UTF-8 into Unicode in vc_utf_char.
2236                      * vc_utf_count is the number of continuation bytes still
2237                      * expected to arrive.
2238                      * vc_npar is the number of continuation bytes arrived so
2239                      * far
2240                      */
2241 rescan_last_byte:
2242                     if ((c & 0xc0) == 0x80) {
2243                         /* Continuation byte received */
2244                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2245                         if (vc->vc_utf_count) {
2246                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2247                             vc->vc_npar++;
2248                             if (--vc->vc_utf_count) {
2249                                 /* Still need some bytes */
2250                                 continue;
2251                             }
2252                             /* Got a whole character */
2253                             c = vc->vc_utf_char;
2254                             /* Reject overlong sequences */
2255                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2256                                         c > utf8_length_changes[vc->vc_npar])
2257                                 c = 0xfffd;
2258                         } else {
2259                             /* Unexpected continuation byte */
2260                             vc->vc_utf_count = 0;
2261                             c = 0xfffd;
2262                         }
2263                     } else {
2264                         /* Single ASCII byte or first byte of a sequence received */
2265                         if (vc->vc_utf_count) {
2266                             /* Continuation byte expected */
2267                             rescan = 1;
2268                             vc->vc_utf_count = 0;
2269                             c = 0xfffd;
2270                         } else if (c > 0x7f) {
2271                             /* First byte of a multibyte sequence received */
2272                             vc->vc_npar = 0;
2273                             if ((c & 0xe0) == 0xc0) {
2274                                 vc->vc_utf_count = 1;
2275                                 vc->vc_utf_char = (c & 0x1f);
2276                             } else if ((c & 0xf0) == 0xe0) {
2277                                 vc->vc_utf_count = 2;
2278                                 vc->vc_utf_char = (c & 0x0f);
2279                             } else if ((c & 0xf8) == 0xf0) {
2280                                 vc->vc_utf_count = 3;
2281                                 vc->vc_utf_char = (c & 0x07);
2282                             } else if ((c & 0xfc) == 0xf8) {
2283                                 vc->vc_utf_count = 4;
2284                                 vc->vc_utf_char = (c & 0x03);
2285                             } else if ((c & 0xfe) == 0xfc) {
2286                                 vc->vc_utf_count = 5;
2287                                 vc->vc_utf_char = (c & 0x01);
2288                             } else {
2289                                 /* 254 and 255 are invalid */
2290                                 c = 0xfffd;
2291                             }
2292                             if (vc->vc_utf_count) {
2293                                 /* Still need some bytes */
2294                                 continue;
2295                             }
2296                         }
2297                         /* Nothing to do if an ASCII byte was received */
2298                     }
2299                     /* End of UTF-8 decoding. */
2300                     /* c is the received character, or U+FFFD for invalid sequences. */
2301                     /* Replace invalid Unicode code points with U+FFFD too */
2302                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2303                         c = 0xfffd;
2304                     tc = c;
2305                 } else {        /* no utf or alternate charset mode */
2306                     tc = vc_translate(vc, c);
2307                 }
2308
2309                 param.c = tc;
2310                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2311                                         &param) == NOTIFY_STOP)
2312                         continue;
2313
2314                 /* If the original code was a control character we
2315                  * only allow a glyph to be displayed if the code is
2316                  * not normally used (such as for cursor movement) or
2317                  * if the disp_ctrl mode has been explicitly enabled.
2318                  * Certain characters (as given by the CTRL_ALWAYS
2319                  * bitmap) are always displayed as control characters,
2320                  * as the console would be pretty useless without
2321                  * them; to display an arbitrary font position use the
2322                  * direct-to-font zone in UTF-8 mode.
2323                  */
2324                 ok = tc && (c >= 32 ||
2325                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2326                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2327                         && (c != 127 || vc->vc_disp_ctrl)
2328                         && (c != 128+27);
2329
2330                 if (vc->vc_state == ESnormal && ok) {
2331                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2332                                 if (is_double_width(c))
2333                                         width = 2;
2334                         }
2335                         /* Now try to find out how to display it */
2336                         tc = conv_uni_to_pc(vc, tc);
2337                         if (tc & ~charmask) {
2338                                 if (tc == -1 || tc == -2) {
2339                                     continue; /* nothing to display */
2340                                 }
2341                                 /* Glyph not found */
2342                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2343                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2344                                        This would make absolutely no sense with Unicode in mind,
2345                                        but do this for ASCII characters since a font may lack
2346                                        Unicode mapping info and we don't want to end up with
2347                                        having question marks only. */
2348                                     tc = c;
2349                                 } else {
2350                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2351                                     tc = conv_uni_to_pc(vc, 0xfffd);
2352                                     if (tc < 0) {
2353                                         inverse = 1;
2354                                         tc = conv_uni_to_pc(vc, '?');
2355                                         if (tc < 0) tc = '?';
2356                                     }
2357                                 }
2358                         }
2359
2360                         if (!inverse) {
2361                                 vc_attr = vc->vc_attr;
2362                         } else {
2363                                 /* invert vc_attr */
2364                                 if (!vc->vc_can_do_color) {
2365                                         vc_attr = (vc->vc_attr) ^ 0x08;
2366                                 } else if (vc->vc_hi_font_mask == 0x100) {
2367                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2368                                 } else {
2369                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2370                                 }
2371                                 con_flush(vc, draw_from, draw_to, &draw_x);
2372                         }
2373
2374                         while (1) {
2375                                 if (vc->vc_need_wrap || vc->vc_decim)
2376                                         con_flush(vc, draw_from, draw_to,
2377                                                         &draw_x);
2378                                 if (vc->vc_need_wrap) {
2379                                         cr(vc);
2380                                         lf(vc);
2381                                 }
2382                                 if (vc->vc_decim)
2383                                         insert_char(vc, 1);
2384                                 scr_writew(himask ?
2385                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2386                                              (vc_attr << 8) + tc,
2387                                            (u16 *) vc->vc_pos);
2388                                 if (con_should_update(vc) && draw_x < 0) {
2389                                         draw_x = vc->vc_x;
2390                                         draw_from = vc->vc_pos;
2391                                 }
2392                                 if (vc->vc_x == vc->vc_cols - 1) {
2393                                         vc->vc_need_wrap = vc->vc_decawm;
2394                                         draw_to = vc->vc_pos + 2;
2395                                 } else {
2396                                         vc->vc_x++;
2397                                         draw_to = (vc->vc_pos += 2);
2398                                 }
2399
2400                                 if (!--width) break;
2401
2402                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2403                                 if (tc < 0) tc = ' ';
2404                         }
2405                         notify_write(vc, c);
2406
2407                         if (inverse)
2408                                 con_flush(vc, draw_from, draw_to, &draw_x);
2409
2410                         if (rescan) {
2411                                 rescan = 0;
2412                                 inverse = 0;
2413                                 width = 1;
2414                                 c = orig;
2415                                 goto rescan_last_byte;
2416                         }
2417                         continue;
2418                 }
2419                 con_flush(vc, draw_from, draw_to, &draw_x);
2420                 do_con_trol(tty, vc, orig);
2421         }
2422         con_flush(vc, draw_from, draw_to, &draw_x);
2423         console_conditional_schedule();
2424         console_unlock();
2425         notify_update(vc);
2426         return n;
2427 }
2428
2429 /*
2430  * This is the console switching callback.
2431  *
2432  * Doing console switching in a process context allows
2433  * us to do the switches asynchronously (needed when we want
2434  * to switch due to a keyboard interrupt).  Synchronization
2435  * with other console code and prevention of re-entrancy is
2436  * ensured with console_lock.
2437  */
2438 static void console_callback(struct work_struct *ignored)
2439 {
2440         console_lock();
2441
2442         if (want_console >= 0) {
2443                 if (want_console != fg_console &&
2444                     vc_cons_allocated(want_console)) {
2445                         hide_cursor(vc_cons[fg_console].d);
2446                         change_console(vc_cons[want_console].d);
2447                         /* we only changed when the console had already
2448                            been allocated - a new console is not created
2449                            in an interrupt routine */
2450                 }
2451                 want_console = -1;
2452         }
2453         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2454                 do_poke_blanked_console = 0;
2455                 poke_blanked_console();
2456         }
2457         if (scrollback_delta) {
2458                 struct vc_data *vc = vc_cons[fg_console].d;
2459                 clear_selection();
2460                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2461                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2462                 scrollback_delta = 0;
2463         }
2464         if (blank_timer_expired) {
2465                 do_blank_screen(0);
2466                 blank_timer_expired = 0;
2467         }
2468         notify_update(vc_cons[fg_console].d);
2469
2470         console_unlock();
2471 }
2472
2473 int set_console(int nr)
2474 {
2475         struct vc_data *vc = vc_cons[fg_console].d;
2476
2477         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2478                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2479
2480                 /*
2481                  * Console switch will fail in console_callback() or
2482                  * change_console() so there is no point scheduling
2483                  * the callback
2484                  *
2485                  * Existing set_console() users don't check the return
2486                  * value so this shouldn't break anything
2487                  */
2488                 return -EINVAL;
2489         }
2490
2491         want_console = nr;
2492         schedule_console_callback();
2493
2494         return 0;
2495 }
2496
2497 struct tty_driver *console_driver;
2498
2499 #ifdef CONFIG_VT_CONSOLE
2500
2501 /**
2502  * vt_kmsg_redirect() - Sets/gets the kernel message console
2503  * @new:        The new virtual terminal number or -1 if the console should stay
2504  *              unchanged
2505  *
2506  * By default, the kernel messages are always printed on the current virtual
2507  * console. However, the user may modify that default with the
2508  * TIOCL_SETKMSGREDIRECT ioctl call.
2509  *
2510  * This function sets the kernel message console to be @new. It returns the old
2511  * virtual console number. The virtual terminal number 0 (both as parameter and
2512  * return value) means no redirection (i.e. always printed on the currently
2513  * active console).
2514  *
2515  * The parameter -1 means that only the current console is returned, but the
2516  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2517  * case to make the code more understandable.
2518  *
2519  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2520  * the parameter and always returns 0.
2521  */
2522 int vt_kmsg_redirect(int new)
2523 {
2524         static int kmsg_con;
2525
2526         if (new != -1)
2527                 return xchg(&kmsg_con, new);
2528         else
2529                 return kmsg_con;
2530 }
2531
2532 /*
2533  *      Console on virtual terminal
2534  *
2535  * The console must be locked when we get here.
2536  */
2537
2538 static void vt_console_print(struct console *co, const char *b, unsigned count)
2539 {
2540         struct vc_data *vc = vc_cons[fg_console].d;
2541         unsigned char c;
2542         static DEFINE_SPINLOCK(printing_lock);
2543         const ushort *start;
2544         ushort cnt = 0;
2545         ushort myx;
2546         int kmsg_console;
2547
2548         /* console busy or not yet initialized */
2549         if (!printable)
2550                 return;
2551         if (!spin_trylock(&printing_lock))
2552                 return;
2553
2554         kmsg_console = vt_get_kmsg_redirect();
2555         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2556                 vc = vc_cons[kmsg_console - 1].d;
2557
2558         /* read `x' only after setting currcons properly (otherwise
2559            the `x' macro will read the x of the foreground console). */
2560         myx = vc->vc_x;
2561
2562         if (!vc_cons_allocated(fg_console)) {
2563                 /* impossible */
2564                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2565                 goto quit;
2566         }
2567
2568         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2569                 goto quit;
2570
2571         /* undraw cursor first */
2572         if (con_is_fg(vc))
2573                 hide_cursor(vc);
2574
2575         start = (ushort *)vc->vc_pos;
2576
2577         /* Contrived structure to try to emulate original need_wrap behaviour
2578          * Problems caused when we have need_wrap set on '\n' character */
2579         while (count--) {
2580                 c = *b++;
2581                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2582                         if (cnt > 0) {
2583                                 if (con_is_visible(vc))
2584                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2585                                 vc->vc_x += cnt;
2586                                 if (vc->vc_need_wrap)
2587                                         vc->vc_x--;
2588                                 cnt = 0;
2589                         }
2590                         if (c == 8) {           /* backspace */
2591                                 bs(vc);
2592                                 start = (ushort *)vc->vc_pos;
2593                                 myx = vc->vc_x;
2594                                 continue;
2595                         }
2596                         if (c != 13)
2597                                 lf(vc);
2598                         cr(vc);
2599                         start = (ushort *)vc->vc_pos;
2600                         myx = vc->vc_x;
2601                         if (c == 10 || c == 13)
2602                                 continue;
2603                 }
2604                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2605                 notify_write(vc, c);
2606                 cnt++;
2607                 if (myx == vc->vc_cols - 1) {
2608                         vc->vc_need_wrap = 1;
2609                         continue;
2610                 }
2611                 vc->vc_pos += 2;
2612                 myx++;
2613         }
2614         if (cnt > 0) {
2615                 if (con_is_visible(vc))
2616                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2617                 vc->vc_x += cnt;
2618                 if (vc->vc_x == vc->vc_cols) {
2619                         vc->vc_x--;
2620                         vc->vc_need_wrap = 1;
2621                 }
2622         }
2623         set_cursor(vc);
2624         notify_update(vc);
2625
2626 quit:
2627         spin_unlock(&printing_lock);
2628 }
2629
2630 static struct tty_driver *vt_console_device(struct console *c, int *index)
2631 {
2632         *index = c->index ? c->index-1 : fg_console;
2633         return console_driver;
2634 }
2635
2636 static struct console vt_console_driver = {
2637         .name           = "tty",
2638         .write          = vt_console_print,
2639         .device         = vt_console_device,
2640         .unblank        = unblank_screen,
2641         .flags          = CON_PRINTBUFFER,
2642         .index          = -1,
2643 };
2644 #endif
2645
2646 /*
2647  *      Handling of Linux-specific VC ioctls
2648  */
2649
2650 /*
2651  * Generally a bit racy with respect to console_lock();.
2652  *
2653  * There are some functions which don't need it.
2654  *
2655  * There are some functions which can sleep for arbitrary periods
2656  * (paste_selection) but we don't need the lock there anyway.
2657  *
2658  * set_selection has locking, and definitely needs it
2659  */
2660
2661 int tioclinux(struct tty_struct *tty, unsigned long arg)
2662 {
2663         char type, data;
2664         char __user *p = (char __user *)arg;
2665         int lines;
2666         int ret;
2667
2668         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2669                 return -EPERM;
2670         if (get_user(type, p))
2671                 return -EFAULT;
2672         ret = 0;
2673
2674         switch (type)
2675         {
2676                 case TIOCL_SETSEL:
2677                         console_lock();
2678                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2679                         console_unlock();
2680                         break;
2681                 case TIOCL_PASTESEL:
2682                         ret = paste_selection(tty);
2683                         break;
2684                 case TIOCL_UNBLANKSCREEN:
2685                         console_lock();
2686                         unblank_screen();
2687                         console_unlock();
2688                         break;
2689                 case TIOCL_SELLOADLUT:
2690                         console_lock();
2691                         ret = sel_loadlut(p);
2692                         console_unlock();
2693                         break;
2694                 case TIOCL_GETSHIFTSTATE:
2695
2696         /*
2697          * Make it possible to react to Shift+Mousebutton.
2698          * Note that 'shift_state' is an undocumented
2699          * kernel-internal variable; programs not closely
2700          * related to the kernel should not use this.
2701          */
2702                         data = vt_get_shift_state();
2703                         ret = __put_user(data, p);
2704                         break;
2705                 case TIOCL_GETMOUSEREPORTING:
2706                         console_lock(); /* May be overkill */
2707                         data = mouse_reporting();
2708                         console_unlock();
2709                         ret = __put_user(data, p);
2710                         break;
2711                 case TIOCL_SETVESABLANK:
2712                         console_lock();
2713                         ret = set_vesa_blanking(p);
2714                         console_unlock();
2715                         break;
2716                 case TIOCL_GETKMSGREDIRECT:
2717                         data = vt_get_kmsg_redirect();
2718                         ret = __put_user(data, p);
2719                         break;
2720                 case TIOCL_SETKMSGREDIRECT:
2721                         if (!capable(CAP_SYS_ADMIN)) {
2722                                 ret = -EPERM;
2723                         } else {
2724                                 if (get_user(data, p+1))
2725                                         ret = -EFAULT;
2726                                 else
2727                                         vt_kmsg_redirect(data);
2728                         }
2729                         break;
2730                 case TIOCL_GETFGCONSOLE:
2731                         /* No locking needed as this is a transiently
2732                            correct return anyway if the caller hasn't
2733                            disabled switching */
2734                         ret = fg_console;
2735                         break;
2736                 case TIOCL_SCROLLCONSOLE:
2737                         if (get_user(lines, (s32 __user *)(p+4))) {
2738                                 ret = -EFAULT;
2739                         } else {
2740                                 /* Need the console lock here. Note that lots
2741                                    of other calls need fixing before the lock
2742                                    is actually useful ! */
2743                                 console_lock();
2744                                 scrollfront(vc_cons[fg_console].d, lines);
2745                                 console_unlock();
2746                                 ret = 0;
2747                         }
2748                         break;
2749                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2750                         console_lock();
2751                         ignore_poke = 1;
2752                         do_blank_screen(0);
2753                         console_unlock();
2754                         break;
2755                 case TIOCL_BLANKEDSCREEN:
2756                         ret = console_blanked;
2757                         break;
2758                 default:
2759                         ret = -EINVAL;
2760                         break;
2761         }
2762         return ret;
2763 }
2764
2765 /*
2766  * /dev/ttyN handling
2767  */
2768
2769 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2770 {
2771         int     retval;
2772
2773         retval = do_con_write(tty, buf, count);
2774         con_flush_chars(tty);
2775
2776         return retval;
2777 }
2778
2779 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2780 {
2781         if (in_interrupt())
2782                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2783         return do_con_write(tty, &ch, 1);
2784 }
2785
2786 static int con_write_room(struct tty_struct *tty)
2787 {
2788         if (tty->stopped)
2789                 return 0;
2790         return 32768;           /* No limit, really; we're not buffering */
2791 }
2792
2793 static int con_chars_in_buffer(struct tty_struct *tty)
2794 {
2795         return 0;               /* we're not buffering */
2796 }
2797
2798 /*
2799  * con_throttle and con_unthrottle are only used for
2800  * paste_selection(), which has to stuff in a large number of
2801  * characters...
2802  */
2803 static void con_throttle(struct tty_struct *tty)
2804 {
2805 }
2806
2807 static void con_unthrottle(struct tty_struct *tty)
2808 {
2809         struct vc_data *vc = tty->driver_data;
2810
2811         wake_up_interruptible(&vc->paste_wait);
2812 }
2813
2814 /*
2815  * Turn the Scroll-Lock LED on when the tty is stopped
2816  */
2817 static void con_stop(struct tty_struct *tty)
2818 {
2819         int console_num;
2820         if (!tty)
2821                 return;
2822         console_num = tty->index;
2823         if (!vc_cons_allocated(console_num))
2824                 return;
2825         vt_kbd_con_stop(console_num);
2826 }
2827
2828 /*
2829  * Turn the Scroll-Lock LED off when the console is started
2830  */
2831 static void con_start(struct tty_struct *tty)
2832 {
2833         int console_num;
2834         if (!tty)
2835                 return;
2836         console_num = tty->index;
2837         if (!vc_cons_allocated(console_num))
2838                 return;
2839         vt_kbd_con_start(console_num);
2840 }
2841
2842 static void con_flush_chars(struct tty_struct *tty)
2843 {
2844         struct vc_data *vc;
2845
2846         if (in_interrupt())     /* from flush_to_ldisc */
2847                 return;
2848
2849         /* if we race with con_close(), vt may be null */
2850         console_lock();
2851         vc = tty->driver_data;
2852         if (vc)
2853                 set_cursor(vc);
2854         console_unlock();
2855 }
2856
2857 /*
2858  * Allocate the console screen memory.
2859  */
2860 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2861 {
2862         unsigned int currcons = tty->index;
2863         struct vc_data *vc;
2864         int ret;
2865
2866         console_lock();
2867         ret = vc_allocate(currcons);
2868         if (ret)
2869                 goto unlock;
2870
2871         vc = vc_cons[currcons].d;
2872
2873         /* Still being freed */
2874         if (vc->port.tty) {
2875                 ret = -ERESTARTSYS;
2876                 goto unlock;
2877         }
2878
2879         ret = tty_port_install(&vc->port, driver, tty);
2880         if (ret)
2881                 goto unlock;
2882
2883         tty->driver_data = vc;
2884         vc->port.tty = tty;
2885
2886         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2887                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2888                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2889         }
2890         if (vc->vc_utf)
2891                 tty->termios.c_iflag |= IUTF8;
2892         else
2893                 tty->termios.c_iflag &= ~IUTF8;
2894 unlock:
2895         console_unlock();
2896         return ret;
2897 }
2898
2899 static int con_open(struct tty_struct *tty, struct file *filp)
2900 {
2901         /* everything done in install */
2902         return 0;
2903 }
2904
2905
2906 static void con_close(struct tty_struct *tty, struct file *filp)
2907 {
2908         /* Nothing to do - we defer to shutdown */
2909 }
2910
2911 static void con_shutdown(struct tty_struct *tty)
2912 {
2913         struct vc_data *vc = tty->driver_data;
2914         BUG_ON(vc == NULL);
2915         console_lock();
2916         vc->port.tty = NULL;
2917         console_unlock();
2918 }
2919
2920 static int default_color           = 7; /* white */
2921 static int default_italic_color    = 2; // green (ASCII)
2922 static int default_underline_color = 3; // cyan (ASCII)
2923 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2924 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2925 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2926
2927 static void vc_init(struct vc_data *vc, unsigned int rows,
2928                     unsigned int cols, int do_clear)
2929 {
2930         int j, k ;
2931
2932         vc->vc_cols = cols;
2933         vc->vc_rows = rows;
2934         vc->vc_size_row = cols << 1;
2935         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2936
2937         set_origin(vc);
2938         vc->vc_pos = vc->vc_origin;
2939         reset_vc(vc);
2940         for (j=k=0; j<16; j++) {
2941                 vc->vc_palette[k++] = default_red[j] ;
2942                 vc->vc_palette[k++] = default_grn[j] ;
2943                 vc->vc_palette[k++] = default_blu[j] ;
2944         }
2945         vc->vc_def_color       = default_color;
2946         vc->vc_ulcolor         = default_underline_color;
2947         vc->vc_itcolor         = default_italic_color;
2948         vc->vc_halfcolor       = 0x08;   /* grey */
2949         init_waitqueue_head(&vc->paste_wait);
2950         reset_terminal(vc, do_clear);
2951 }
2952
2953 /*
2954  * This routine initializes console interrupts, and does nothing
2955  * else. If you want the screen to clear, call tty_write with
2956  * the appropriate escape-sequence.
2957  */
2958
2959 static int __init con_init(void)
2960 {
2961         const char *display_desc = NULL;
2962         struct vc_data *vc;
2963         unsigned int currcons = 0, i;
2964
2965         console_lock();
2966
2967         if (conswitchp)
2968                 display_desc = conswitchp->con_startup();
2969         if (!display_desc) {
2970                 fg_console = 0;
2971                 console_unlock();
2972                 return 0;
2973         }
2974
2975         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2976                 struct con_driver *con_driver = &registered_con_driver[i];
2977
2978                 if (con_driver->con == NULL) {
2979                         con_driver->con = conswitchp;
2980                         con_driver->desc = display_desc;
2981                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2982                         con_driver->first = 0;
2983                         con_driver->last = MAX_NR_CONSOLES - 1;
2984                         break;
2985                 }
2986         }
2987
2988         for (i = 0; i < MAX_NR_CONSOLES; i++)
2989                 con_driver_map[i] = conswitchp;
2990
2991         if (blankinterval) {
2992                 blank_state = blank_normal_wait;
2993                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2994         }
2995
2996         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2997                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2998                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2999                 tty_port_init(&vc->port);
3000                 visual_init(vc, currcons, 1);
3001                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3002                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3003                         currcons || !vc->vc_sw->con_save_screen);
3004         }
3005         currcons = fg_console = 0;
3006         master_display_fg = vc = vc_cons[currcons].d;
3007         set_origin(vc);
3008         save_screen(vc);
3009         gotoxy(vc, vc->vc_x, vc->vc_y);
3010         csi_J(vc, 0);
3011         update_screen(vc);
3012         pr_info("Console: %s %s %dx%d\n",
3013                 vc->vc_can_do_color ? "colour" : "mono",
3014                 display_desc, vc->vc_cols, vc->vc_rows);
3015         printable = 1;
3016
3017         console_unlock();
3018
3019 #ifdef CONFIG_VT_CONSOLE
3020         register_console(&vt_console_driver);
3021 #endif
3022         return 0;
3023 }
3024 console_initcall(con_init);
3025
3026 static const struct tty_operations con_ops = {
3027         .install = con_install,
3028         .open = con_open,
3029         .close = con_close,
3030         .write = con_write,
3031         .write_room = con_write_room,
3032         .put_char = con_put_char,
3033         .flush_chars = con_flush_chars,
3034         .chars_in_buffer = con_chars_in_buffer,
3035         .ioctl = vt_ioctl,
3036 #ifdef CONFIG_COMPAT
3037         .compat_ioctl = vt_compat_ioctl,
3038 #endif
3039         .stop = con_stop,
3040         .start = con_start,
3041         .throttle = con_throttle,
3042         .unthrottle = con_unthrottle,
3043         .resize = vt_resize,
3044         .shutdown = con_shutdown
3045 };
3046
3047 static struct cdev vc0_cdev;
3048
3049 static ssize_t show_tty_active(struct device *dev,
3050                                 struct device_attribute *attr, char *buf)
3051 {
3052         return sprintf(buf, "tty%d\n", fg_console + 1);
3053 }
3054 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3055
3056 static struct attribute *vt_dev_attrs[] = {
3057         &dev_attr_active.attr,
3058         NULL
3059 };
3060
3061 ATTRIBUTE_GROUPS(vt_dev);
3062
3063 int __init vty_init(const struct file_operations *console_fops)
3064 {
3065         cdev_init(&vc0_cdev, console_fops);
3066         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3067             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3068                 panic("Couldn't register /dev/tty0 driver\n");
3069         tty0dev = device_create_with_groups(tty_class, NULL,
3070                                             MKDEV(TTY_MAJOR, 0), NULL,
3071                                             vt_dev_groups, "tty0");
3072         if (IS_ERR(tty0dev))
3073                 tty0dev = NULL;
3074
3075         vcs_init();
3076
3077         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3078         if (!console_driver)
3079                 panic("Couldn't allocate console driver\n");
3080
3081         console_driver->name = "tty";
3082         console_driver->name_base = 1;
3083         console_driver->major = TTY_MAJOR;
3084         console_driver->minor_start = 1;
3085         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3086         console_driver->init_termios = tty_std_termios;
3087         if (default_utf8)
3088                 console_driver->init_termios.c_iflag |= IUTF8;
3089         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3090         tty_set_operations(console_driver, &con_ops);
3091         if (tty_register_driver(console_driver))
3092                 panic("Couldn't register console driver\n");
3093         kbd_init();
3094         console_map_init();
3095 #ifdef CONFIG_MDA_CONSOLE
3096         mda_console_init();
3097 #endif
3098         return 0;
3099 }
3100
3101 #ifndef VT_SINGLE_DRIVER
3102
3103 static struct class *vtconsole_class;
3104
3105 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3106                            int deflt)
3107 {
3108         struct module *owner = csw->owner;
3109         const char *desc = NULL;
3110         struct con_driver *con_driver;
3111         int i, j = -1, k = -1, retval = -ENODEV;
3112
3113         if (!try_module_get(owner))
3114                 return -ENODEV;
3115
3116         WARN_CONSOLE_UNLOCKED();
3117
3118         /* check if driver is registered */
3119         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3120                 con_driver = &registered_con_driver[i];
3121
3122                 if (con_driver->con == csw) {
3123                         desc = con_driver->desc;
3124                         retval = 0;
3125                         break;
3126                 }
3127         }
3128
3129         if (retval)
3130                 goto err;
3131
3132         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3133                 csw->con_startup();
3134                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3135         }
3136
3137         if (deflt) {
3138                 if (conswitchp)
3139                         module_put(conswitchp->owner);
3140
3141                 __module_get(owner);
3142                 conswitchp = csw;
3143         }
3144
3145         first = max(first, con_driver->first);
3146         last = min(last, con_driver->last);
3147
3148         for (i = first; i <= last; i++) {
3149                 int old_was_color;
3150                 struct vc_data *vc = vc_cons[i].d;
3151
3152                 if (con_driver_map[i])
3153                         module_put(con_driver_map[i]->owner);
3154                 __module_get(owner);
3155                 con_driver_map[i] = csw;
3156
3157                 if (!vc || !vc->vc_sw)
3158                         continue;
3159
3160                 j = i;
3161
3162                 if (con_is_visible(vc)) {
3163                         k = i;
3164                         save_screen(vc);
3165                 }
3166
3167                 old_was_color = vc->vc_can_do_color;
3168                 vc->vc_sw->con_deinit(vc);
3169                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3170                 visual_init(vc, i, 0);
3171                 set_origin(vc);
3172                 update_attr(vc);
3173
3174                 /* If the console changed between mono <-> color, then
3175                  * the attributes in the screenbuf will be wrong.  The
3176                  * following resets all attributes to something sane.
3177                  */
3178                 if (old_was_color != vc->vc_can_do_color)
3179                         clear_buffer_attributes(vc);
3180         }
3181
3182         pr_info("Console: switching ");
3183         if (!deflt)
3184                 printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
3185         if (j >= 0) {
3186                 struct vc_data *vc = vc_cons[j].d;
3187
3188                 printk(KERN_CONT "to %s %s %dx%d\n",
3189                        vc->vc_can_do_color ? "colour" : "mono",
3190                        desc, vc->vc_cols, vc->vc_rows);
3191
3192                 if (k >= 0) {
3193                         vc = vc_cons[k].d;
3194                         update_screen(vc);
3195                 }
3196         } else
3197                 printk(KERN_CONT "to %s\n", desc);
3198
3199         retval = 0;
3200 err:
3201         module_put(owner);
3202         return retval;
3203 };
3204
3205
3206 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3207 /* unlocked version of unbind_con_driver() */
3208 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3209 {
3210         struct module *owner = csw->owner;
3211         const struct consw *defcsw = NULL;
3212         struct con_driver *con_driver = NULL, *con_back = NULL;
3213         int i, retval = -ENODEV;
3214
3215         if (!try_module_get(owner))
3216                 return -ENODEV;
3217
3218         WARN_CONSOLE_UNLOCKED();
3219
3220         /* check if driver is registered and if it is unbindable */
3221         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3222                 con_driver = &registered_con_driver[i];
3223
3224                 if (con_driver->con == csw &&
3225                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3226                         retval = 0;
3227                         break;
3228                 }
3229         }
3230
3231         if (retval)
3232                 goto err;
3233
3234         retval = -ENODEV;
3235
3236         /* check if backup driver exists */
3237         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3238                 con_back = &registered_con_driver[i];
3239
3240                 if (con_back->con && con_back->con != csw) {
3241                         defcsw = con_back->con;
3242                         retval = 0;
3243                         break;
3244                 }
3245         }
3246
3247         if (retval)
3248                 goto err;
3249
3250         if (!con_is_bound(csw))
3251                 goto err;
3252
3253         first = max(first, con_driver->first);
3254         last = min(last, con_driver->last);
3255
3256         for (i = first; i <= last; i++) {
3257                 if (con_driver_map[i] == csw) {
3258                         module_put(csw->owner);
3259                         con_driver_map[i] = NULL;
3260                 }
3261         }
3262
3263         if (!con_is_bound(defcsw)) {
3264                 const struct consw *defconsw = conswitchp;
3265
3266                 defcsw->con_startup();
3267                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3268                 /*
3269                  * vgacon may change the default driver to point
3270                  * to dummycon, we restore it here...
3271                  */
3272                 conswitchp = defconsw;
3273         }
3274
3275         if (!con_is_bound(csw))
3276                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3277
3278         /* ignore return value, binding should not fail */
3279         do_bind_con_driver(defcsw, first, last, deflt);
3280 err:
3281         module_put(owner);
3282         return retval;
3283
3284 }
3285 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3286
3287 static int vt_bind(struct con_driver *con)
3288 {
3289         const struct consw *defcsw = NULL, *csw = NULL;
3290         int i, more = 1, first = -1, last = -1, deflt = 0;
3291
3292         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3293                 goto err;
3294
3295         csw = con->con;
3296
3297         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3298                 struct con_driver *con = &registered_con_driver[i];
3299
3300                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3301                         defcsw = con->con;
3302                         break;
3303                 }
3304         }
3305
3306         if (!defcsw)
3307                 goto err;
3308
3309         while (more) {
3310                 more = 0;
3311
3312                 for (i = con->first; i <= con->last; i++) {
3313                         if (con_driver_map[i] == defcsw) {
3314                                 if (first == -1)
3315                                         first = i;
3316                                 last = i;
3317                                 more = 1;
3318                         } else if (first != -1)
3319                                 break;
3320                 }
3321
3322                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3323                         deflt = 1;
3324
3325                 if (first != -1)
3326                         do_bind_con_driver(csw, first, last, deflt);
3327
3328                 first = -1;
3329                 last = -1;
3330                 deflt = 0;
3331         }
3332
3333 err:
3334         return 0;
3335 }
3336
3337 static int vt_unbind(struct con_driver *con)
3338 {
3339         const struct consw *csw = NULL;
3340         int i, more = 1, first = -1, last = -1, deflt = 0;
3341         int ret;
3342
3343         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3344                 goto err;
3345
3346         csw = con->con;
3347
3348         while (more) {
3349                 more = 0;
3350
3351                 for (i = con->first; i <= con->last; i++) {
3352                         if (con_driver_map[i] == csw) {
3353                                 if (first == -1)
3354                                         first = i;
3355                                 last = i;
3356                                 more = 1;
3357                         } else if (first != -1)
3358                                 break;
3359                 }
3360
3361                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3362                         deflt = 1;
3363
3364                 if (first != -1) {
3365                         ret = do_unbind_con_driver(csw, first, last, deflt);
3366                         if (ret != 0)
3367                                 return ret;
3368                 }
3369
3370                 first = -1;
3371                 last = -1;
3372                 deflt = 0;
3373         }
3374
3375 err:
3376         return 0;
3377 }
3378 #else
3379 static inline int vt_bind(struct con_driver *con)
3380 {
3381         return 0;
3382 }
3383 static inline int vt_unbind(struct con_driver *con)
3384 {
3385         return 0;
3386 }
3387 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3388
3389 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3390                           const char *buf, size_t count)
3391 {
3392         struct con_driver *con = dev_get_drvdata(dev);
3393         int bind = simple_strtoul(buf, NULL, 0);
3394
3395         console_lock();
3396
3397         if (bind)
3398                 vt_bind(con);
3399         else
3400                 vt_unbind(con);
3401
3402         console_unlock();
3403
3404         return count;
3405 }
3406
3407 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3408                          char *buf)
3409 {
3410         struct con_driver *con = dev_get_drvdata(dev);
3411         int bind = con_is_bound(con->con);
3412
3413         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3414 }
3415
3416 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3417                          char *buf)
3418 {
3419         struct con_driver *con = dev_get_drvdata(dev);
3420
3421         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3422                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3423                          con->desc);
3424
3425 }
3426
3427 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3428 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3429
3430 static struct attribute *con_dev_attrs[] = {
3431         &dev_attr_bind.attr,
3432         &dev_attr_name.attr,
3433         NULL
3434 };
3435
3436 ATTRIBUTE_GROUPS(con_dev);
3437
3438 static int vtconsole_init_device(struct con_driver *con)
3439 {
3440         con->flag |= CON_DRIVER_FLAG_ATTR;
3441         return 0;
3442 }
3443
3444 static void vtconsole_deinit_device(struct con_driver *con)
3445 {
3446         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3447 }
3448
3449 /**
3450  * con_is_bound - checks if driver is bound to the console
3451  * @csw: console driver
3452  *
3453  * RETURNS: zero if unbound, nonzero if bound
3454  *
3455  * Drivers can call this and if zero, they should release
3456  * all resources allocated on con_startup()
3457  */
3458 int con_is_bound(const struct consw *csw)
3459 {
3460         int i, bound = 0;
3461
3462         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3463                 if (con_driver_map[i] == csw) {
3464                         bound = 1;
3465                         break;
3466                 }
3467         }
3468
3469         return bound;
3470 }
3471 EXPORT_SYMBOL(con_is_bound);
3472
3473 /**
3474  * con_debug_enter - prepare the console for the kernel debugger
3475  * @sw: console driver
3476  *
3477  * Called when the console is taken over by the kernel debugger, this
3478  * function needs to save the current console state, then put the console
3479  * into a state suitable for the kernel debugger.
3480  *
3481  * RETURNS:
3482  * Zero on success, nonzero if a failure occurred when trying to prepare
3483  * the console for the debugger.
3484  */
3485 int con_debug_enter(struct vc_data *vc)
3486 {
3487         int ret = 0;
3488
3489         saved_fg_console = fg_console;
3490         saved_last_console = last_console;
3491         saved_want_console = want_console;
3492         saved_vc_mode = vc->vc_mode;
3493         saved_console_blanked = console_blanked;
3494         vc->vc_mode = KD_TEXT;
3495         console_blanked = 0;
3496         if (vc->vc_sw->con_debug_enter)
3497                 ret = vc->vc_sw->con_debug_enter(vc);
3498 #ifdef CONFIG_KGDB_KDB
3499         /* Set the initial LINES variable if it is not already set */
3500         if (vc->vc_rows < 999) {
3501                 int linecount;
3502                 char lns[4];
3503                 const char *setargs[3] = {
3504                         "set",
3505                         "LINES",
3506                         lns,
3507                 };
3508                 if (kdbgetintenv(setargs[0], &linecount)) {
3509                         snprintf(lns, 4, "%i", vc->vc_rows);
3510                         kdb_set(2, setargs);
3511                 }
3512         }
3513         if (vc->vc_cols < 999) {
3514                 int colcount;
3515                 char cols[4];
3516                 const char *setargs[3] = {
3517                         "set",
3518                         "COLUMNS",
3519                         cols,
3520                 };
3521                 if (kdbgetintenv(setargs[0], &colcount)) {
3522                         snprintf(cols, 4, "%i", vc->vc_cols);
3523                         kdb_set(2, setargs);
3524                 }
3525         }
3526 #endif /* CONFIG_KGDB_KDB */
3527         return ret;
3528 }
3529 EXPORT_SYMBOL_GPL(con_debug_enter);
3530
3531 /**
3532  * con_debug_leave - restore console state
3533  * @sw: console driver
3534  *
3535  * Restore the console state to what it was before the kernel debugger
3536  * was invoked.
3537  *
3538  * RETURNS:
3539  * Zero on success, nonzero if a failure occurred when trying to restore
3540  * the console.
3541  */
3542 int con_debug_leave(void)
3543 {
3544         struct vc_data *vc;
3545         int ret = 0;
3546
3547         fg_console = saved_fg_console;
3548         last_console = saved_last_console;
3549         want_console = saved_want_console;
3550         console_blanked = saved_console_blanked;
3551         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3552
3553         vc = vc_cons[fg_console].d;
3554         if (vc->vc_sw->con_debug_leave)
3555                 ret = vc->vc_sw->con_debug_leave(vc);
3556         return ret;
3557 }
3558 EXPORT_SYMBOL_GPL(con_debug_leave);
3559
3560 static int do_register_con_driver(const struct consw *csw, int first, int last)
3561 {
3562         struct module *owner = csw->owner;
3563         struct con_driver *con_driver;
3564         const char *desc;
3565         int i, retval;
3566
3567         WARN_CONSOLE_UNLOCKED();
3568
3569         if (!try_module_get(owner))
3570                 return -ENODEV;
3571
3572         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3573                 con_driver = &registered_con_driver[i];
3574
3575                 /* already registered */
3576                 if (con_driver->con == csw) {
3577                         retval = -EBUSY;
3578                         goto err;
3579                 }
3580         }
3581
3582         desc = csw->con_startup();
3583         if (!desc) {
3584                 retval = -ENODEV;
3585                 goto err;
3586         }
3587
3588         retval = -EINVAL;
3589
3590         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3591                 con_driver = &registered_con_driver[i];
3592
3593                 if (con_driver->con == NULL &&
3594                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3595                         con_driver->con = csw;
3596                         con_driver->desc = desc;
3597                         con_driver->node = i;
3598                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3599                                            CON_DRIVER_FLAG_INIT;
3600                         con_driver->first = first;
3601                         con_driver->last = last;
3602                         retval = 0;
3603                         break;
3604                 }
3605         }
3606
3607         if (retval)
3608                 goto err;
3609
3610         con_driver->dev =
3611                 device_create_with_groups(vtconsole_class, NULL,
3612                                           MKDEV(0, con_driver->node),
3613                                           con_driver, con_dev_groups,
3614                                           "vtcon%i", con_driver->node);
3615         if (IS_ERR(con_driver->dev)) {
3616                 printk(KERN_WARNING "Unable to create device for %s; "
3617                        "errno = %ld\n", con_driver->desc,
3618                        PTR_ERR(con_driver->dev));
3619                 con_driver->dev = NULL;
3620         } else {
3621                 vtconsole_init_device(con_driver);
3622         }
3623
3624 err:
3625         module_put(owner);
3626         return retval;
3627 }
3628
3629
3630 /**
3631  * do_unregister_con_driver - unregister console driver from console layer
3632  * @csw: console driver
3633  *
3634  * DESCRIPTION: All drivers that registers to the console layer must
3635  * call this function upon exit, or if the console driver is in a state
3636  * where it won't be able to handle console services, such as the
3637  * framebuffer console without loaded framebuffer drivers.
3638  *
3639  * The driver must unbind first prior to unregistration.
3640  */
3641 int do_unregister_con_driver(const struct consw *csw)
3642 {
3643         int i;
3644
3645         /* cannot unregister a bound driver */
3646         if (con_is_bound(csw))
3647                 return -EBUSY;
3648
3649         if (csw == conswitchp)
3650                 return -EINVAL;
3651
3652         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3653                 struct con_driver *con_driver = &registered_con_driver[i];
3654
3655                 if (con_driver->con == csw) {
3656                         /*
3657                          * Defer the removal of the sysfs entries since that
3658                          * will acquire the kernfs s_active lock and we can't
3659                          * acquire this lock while holding the console lock:
3660                          * the unbind sysfs entry imposes already the opposite
3661                          * order. Reset con already here to prevent any later
3662                          * lookup to succeed and mark this slot as zombie, so
3663                          * it won't get reused until we complete the removal
3664                          * in the deferred work.
3665                          */
3666                         con_driver->con = NULL;
3667                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3668                         schedule_work(&con_driver_unregister_work);
3669
3670                         return 0;
3671                 }
3672         }
3673
3674         return -ENODEV;
3675 }
3676 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3677
3678 static void con_driver_unregister_callback(struct work_struct *ignored)
3679 {
3680         int i;
3681
3682         console_lock();
3683
3684         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3685                 struct con_driver *con_driver = &registered_con_driver[i];
3686
3687                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3688                         continue;
3689
3690                 console_unlock();
3691
3692                 vtconsole_deinit_device(con_driver);
3693                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3694
3695                 console_lock();
3696
3697                 if (WARN_ON_ONCE(con_driver->con))
3698                         con_driver->con = NULL;
3699                 con_driver->desc = NULL;
3700                 con_driver->dev = NULL;
3701                 con_driver->node = 0;
3702                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3703                 con_driver->flag = 0;
3704                 con_driver->first = 0;
3705                 con_driver->last = 0;
3706         }
3707
3708         console_unlock();
3709 }
3710
3711 /*
3712  *      If we support more console drivers, this function is used
3713  *      when a driver wants to take over some existing consoles
3714  *      and become default driver for newly opened ones.
3715  *
3716  *      do_take_over_console is basically a register followed by unbind
3717  */
3718 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3719 {
3720         int err;
3721
3722         err = do_register_con_driver(csw, first, last);
3723         /*
3724          * If we get an busy error we still want to bind the console driver
3725          * and return success, as we may have unbound the console driver
3726          * but not unregistered it.
3727          */
3728         if (err == -EBUSY)
3729                 err = 0;
3730         if (!err)
3731                 do_bind_con_driver(csw, first, last, deflt);
3732
3733         return err;
3734 }
3735 EXPORT_SYMBOL_GPL(do_take_over_console);
3736
3737
3738 /*
3739  * give_up_console is a wrapper to unregister_con_driver. It will only
3740  * work if driver is fully unbound.
3741  */
3742 void give_up_console(const struct consw *csw)
3743 {
3744         console_lock();
3745         do_unregister_con_driver(csw);
3746         console_unlock();
3747 }
3748
3749 static int __init vtconsole_class_init(void)
3750 {
3751         int i;
3752
3753         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3754         if (IS_ERR(vtconsole_class)) {
3755                 printk(KERN_WARNING "Unable to create vt console class; "
3756                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3757                 vtconsole_class = NULL;
3758         }
3759
3760         /* Add system drivers to sysfs */
3761         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3762                 struct con_driver *con = &registered_con_driver[i];
3763
3764                 if (con->con && !con->dev) {
3765                         con->dev =
3766                                 device_create_with_groups(vtconsole_class, NULL,
3767                                                           MKDEV(0, con->node),
3768                                                           con, con_dev_groups,
3769                                                           "vtcon%i", con->node);
3770
3771                         if (IS_ERR(con->dev)) {
3772                                 printk(KERN_WARNING "Unable to create "
3773                                        "device for %s; errno = %ld\n",
3774                                        con->desc, PTR_ERR(con->dev));
3775                                 con->dev = NULL;
3776                         } else {
3777                                 vtconsole_init_device(con);
3778                         }
3779                 }
3780         }
3781
3782         return 0;
3783 }
3784 postcore_initcall(vtconsole_class_init);
3785
3786 #endif
3787
3788 /*
3789  *      Screen blanking
3790  */
3791
3792 static int set_vesa_blanking(char __user *p)
3793 {
3794         unsigned int mode;
3795
3796         if (get_user(mode, p + 1))
3797                 return -EFAULT;
3798
3799         vesa_blank_mode = (mode < 4) ? mode : 0;
3800         return 0;
3801 }
3802
3803 void do_blank_screen(int entering_gfx)
3804 {
3805         struct vc_data *vc = vc_cons[fg_console].d;
3806         int i;
3807
3808         WARN_CONSOLE_UNLOCKED();
3809
3810         if (console_blanked) {
3811                 if (blank_state == blank_vesa_wait) {
3812                         blank_state = blank_off;
3813                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3814                 }
3815                 return;
3816         }
3817
3818         /* entering graphics mode? */
3819         if (entering_gfx) {
3820                 hide_cursor(vc);
3821                 save_screen(vc);
3822                 vc->vc_sw->con_blank(vc, -1, 1);
3823                 console_blanked = fg_console + 1;
3824                 blank_state = blank_off;
3825                 set_origin(vc);
3826                 return;
3827         }
3828
3829         if (blank_state != blank_normal_wait)
3830                 return;
3831         blank_state = blank_off;
3832
3833         /* don't blank graphics */
3834         if (vc->vc_mode != KD_TEXT) {
3835                 console_blanked = fg_console + 1;
3836                 return;
3837         }
3838
3839         hide_cursor(vc);
3840         del_timer_sync(&console_timer);
3841         blank_timer_expired = 0;
3842
3843         save_screen(vc);
3844         /* In case we need to reset origin, blanking hook returns 1 */
3845         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3846         console_blanked = fg_console + 1;
3847         if (i)
3848                 set_origin(vc);
3849
3850         if (console_blank_hook && console_blank_hook(1))
3851                 return;
3852
3853         if (vesa_off_interval && vesa_blank_mode) {
3854                 blank_state = blank_vesa_wait;
3855                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3856         }
3857         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3858 }
3859 EXPORT_SYMBOL(do_blank_screen);
3860
3861 /*
3862  * Called by timer as well as from vt_console_driver
3863  */
3864 void do_unblank_screen(int leaving_gfx)
3865 {
3866         struct vc_data *vc;
3867
3868         /* This should now always be called from a "sane" (read: can schedule)
3869          * context for the sake of the low level drivers, except in the special
3870          * case of oops_in_progress
3871          */
3872         if (!oops_in_progress)
3873                 might_sleep();
3874
3875         WARN_CONSOLE_UNLOCKED();
3876
3877         ignore_poke = 0;
3878         if (!console_blanked)
3879                 return;
3880         if (!vc_cons_allocated(fg_console)) {
3881                 /* impossible */
3882                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3883                         fg_console + 1);
3884                 return;
3885         }
3886         vc = vc_cons[fg_console].d;
3887         /* Try to unblank in oops case too */
3888         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3889                 return; /* but leave console_blanked != 0 */
3890
3891         if (blankinterval) {
3892                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3893                 blank_state = blank_normal_wait;
3894         }
3895
3896         console_blanked = 0;
3897         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3898                 /* Low-level driver cannot restore -> do it ourselves */
3899                 update_screen(vc);
3900         if (console_blank_hook)
3901                 console_blank_hook(0);
3902         set_palette(vc);
3903         set_cursor(vc);
3904         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3905 }
3906 EXPORT_SYMBOL(do_unblank_screen);
3907
3908 /*
3909  * This is called by the outside world to cause a forced unblank, mostly for
3910  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3911  * call it with 1 as an argument and so force a mode restore... that may kill
3912  * X or at least garbage the screen but would also make the Oops visible...
3913  */
3914 void unblank_screen(void)
3915 {
3916         do_unblank_screen(0);
3917 }
3918
3919 /*
3920  * We defer the timer blanking to work queue so it can take the console mutex
3921  * (console operations can still happen at irq time, but only from printk which
3922  * has the console mutex. Not perfect yet, but better than no locking
3923  */
3924 static void blank_screen_t(unsigned long dummy)
3925 {
3926         blank_timer_expired = 1;
3927         schedule_work(&console_work);
3928 }
3929
3930 void poke_blanked_console(void)
3931 {
3932         WARN_CONSOLE_UNLOCKED();
3933
3934         /* Add this so we quickly catch whoever might call us in a non
3935          * safe context. Nowadays, unblank_screen() isn't to be called in
3936          * atomic contexts and is allowed to schedule (with the special case
3937          * of oops_in_progress, but that isn't of any concern for this
3938          * function. --BenH.
3939          */
3940         might_sleep();
3941
3942         /* This isn't perfectly race free, but a race here would be mostly harmless,
3943          * at worse, we'll do a spurrious blank and it's unlikely
3944          */
3945         del_timer(&console_timer);
3946         blank_timer_expired = 0;
3947
3948         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3949                 return;
3950         if (console_blanked)
3951                 unblank_screen();
3952         else if (blankinterval) {
3953                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3954                 blank_state = blank_normal_wait;
3955         }
3956 }
3957
3958 /*
3959  *      Palettes
3960  */
3961
3962 static void set_palette(struct vc_data *vc)
3963 {
3964         WARN_CONSOLE_UNLOCKED();
3965
3966         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3967                 vc->vc_sw->con_set_palette(vc, color_table);
3968 }
3969
3970 /*
3971  * Load palette into the DAC registers. arg points to a colour
3972  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3973  */
3974
3975 int con_set_cmap(unsigned char __user *arg)
3976 {
3977         int i, j, k;
3978         unsigned char colormap[3*16];
3979
3980         if (copy_from_user(colormap, arg, sizeof(colormap)))
3981                 return -EFAULT;
3982
3983         console_lock();
3984         for (i = k = 0; i < 16; i++) {
3985                 default_red[i] = colormap[k++];
3986                 default_grn[i] = colormap[k++];
3987                 default_blu[i] = colormap[k++];
3988         }
3989         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3990                 if (!vc_cons_allocated(i))
3991                         continue;
3992                 for (j = k = 0; j < 16; j++) {
3993                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3994                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3995                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3996                 }
3997                 set_palette(vc_cons[i].d);
3998         }
3999         console_unlock();
4000
4001         return 0;
4002 }
4003
4004 int con_get_cmap(unsigned char __user *arg)
4005 {
4006         int i, k;
4007         unsigned char colormap[3*16];
4008
4009         console_lock();
4010         for (i = k = 0; i < 16; i++) {
4011                 colormap[k++] = default_red[i];
4012                 colormap[k++] = default_grn[i];
4013                 colormap[k++] = default_blu[i];
4014         }
4015         console_unlock();
4016
4017         if (copy_to_user(arg, colormap, sizeof(colormap)))
4018                 return -EFAULT;
4019
4020         return 0;
4021 }
4022
4023 void reset_palette(struct vc_data *vc)
4024 {
4025         int j, k;
4026         for (j=k=0; j<16; j++) {
4027                 vc->vc_palette[k++] = default_red[j];
4028                 vc->vc_palette[k++] = default_grn[j];
4029                 vc->vc_palette[k++] = default_blu[j];
4030         }
4031         set_palette(vc);
4032 }
4033
4034 /*
4035  *  Font switching
4036  *
4037  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4038  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4039  *  depending on width) reserved for each character which is kinda wasty, but
4040  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4041  *  is up to the actual low-level console-driver convert data into its favorite
4042  *  format (maybe we should add a `fontoffset' field to the `display'
4043  *  structure so we won't have to convert the fontdata all the time.
4044  *  /Jes
4045  */
4046
4047 #define max_font_size 65536
4048
4049 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4050 {
4051         struct console_font font;
4052         int rc = -EINVAL;
4053         int c;
4054
4055         if (op->data) {
4056                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4057                 if (!font.data)
4058                         return -ENOMEM;
4059         } else
4060                 font.data = NULL;
4061
4062         console_lock();
4063         if (vc->vc_mode != KD_TEXT)
4064                 rc = -EINVAL;
4065         else if (vc->vc_sw->con_font_get)
4066                 rc = vc->vc_sw->con_font_get(vc, &font);
4067         else
4068                 rc = -ENOSYS;
4069         console_unlock();
4070
4071         if (rc)
4072                 goto out;
4073
4074         c = (font.width+7)/8 * 32 * font.charcount;
4075
4076         if (op->data && font.charcount > op->charcount)
4077                 rc = -ENOSPC;
4078         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4079                 if (font.width > op->width || font.height > op->height)
4080                         rc = -ENOSPC;
4081         } else {
4082                 if (font.width != 8)
4083                         rc = -EIO;
4084                 else if ((op->height && font.height > op->height) ||
4085                          font.height > 32)
4086                         rc = -ENOSPC;
4087         }
4088         if (rc)
4089                 goto out;
4090
4091         op->height = font.height;
4092         op->width = font.width;
4093         op->charcount = font.charcount;
4094
4095         if (op->data && copy_to_user(op->data, font.data, c))
4096                 rc = -EFAULT;
4097
4098 out:
4099         kfree(font.data);
4100         return rc;
4101 }
4102
4103 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4104 {
4105         struct console_font font;
4106         int rc = -EINVAL;
4107         int size;
4108
4109         if (vc->vc_mode != KD_TEXT)
4110                 return -EINVAL;
4111         if (!op->data)
4112                 return -EINVAL;
4113         if (op->charcount > 512)
4114                 return -EINVAL;
4115         if (!op->height) {              /* Need to guess font height [compat] */
4116                 int h, i;
4117                 u8 __user *charmap = op->data;
4118                 u8 tmp;
4119
4120                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4121                    so that we can get rid of this soon */
4122                 if (!(op->flags & KD_FONT_FLAG_OLD))
4123                         return -EINVAL;
4124                 for (h = 32; h > 0; h--)
4125                         for (i = 0; i < op->charcount; i++) {
4126                                 if (get_user(tmp, &charmap[32*i+h-1]))
4127                                         return -EFAULT;
4128                                 if (tmp)
4129                                         goto nonzero;
4130                         }
4131                 return -EINVAL;
4132         nonzero:
4133                 op->height = h;
4134         }
4135         if (op->width <= 0 || op->width > 32 || op->height > 32)
4136                 return -EINVAL;
4137         size = (op->width+7)/8 * 32 * op->charcount;
4138         if (size > max_font_size)
4139                 return -ENOSPC;
4140         font.charcount = op->charcount;
4141         font.height = op->height;
4142         font.width = op->width;
4143         font.data = memdup_user(op->data, size);
4144         if (IS_ERR(font.data))
4145                 return PTR_ERR(font.data);
4146         console_lock();
4147         if (vc->vc_mode != KD_TEXT)
4148                 rc = -EINVAL;
4149         else if (vc->vc_sw->con_font_set)
4150                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4151         else
4152                 rc = -ENOSYS;
4153         console_unlock();
4154         kfree(font.data);
4155         return rc;
4156 }
4157
4158 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4159 {
4160         struct console_font font = {.width = op->width, .height = op->height};
4161         char name[MAX_FONT_NAME];
4162         char *s = name;
4163         int rc;
4164
4165
4166         if (!op->data)
4167                 s = NULL;
4168         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4169                 return -EFAULT;
4170         else
4171                 name[MAX_FONT_NAME - 1] = 0;
4172
4173         console_lock();
4174         if (vc->vc_mode != KD_TEXT) {
4175                 console_unlock();
4176                 return -EINVAL;
4177         }
4178         if (vc->vc_sw->con_font_default)
4179                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4180         else
4181                 rc = -ENOSYS;
4182         console_unlock();
4183         if (!rc) {
4184                 op->width = font.width;
4185                 op->height = font.height;
4186         }
4187         return rc;
4188 }
4189
4190 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4191 {
4192         int con = op->height;
4193         int rc;
4194
4195
4196         console_lock();
4197         if (vc->vc_mode != KD_TEXT)
4198                 rc = -EINVAL;
4199         else if (!vc->vc_sw->con_font_copy)
4200                 rc = -ENOSYS;
4201         else if (con < 0 || !vc_cons_allocated(con))
4202                 rc = -ENOTTY;
4203         else if (con == vc->vc_num)     /* nothing to do */
4204                 rc = 0;
4205         else
4206                 rc = vc->vc_sw->con_font_copy(vc, con);
4207         console_unlock();
4208         return rc;
4209 }
4210
4211 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4212 {
4213         switch (op->op) {
4214         case KD_FONT_OP_SET:
4215                 return con_font_set(vc, op);
4216         case KD_FONT_OP_GET:
4217                 return con_font_get(vc, op);
4218         case KD_FONT_OP_SET_DEFAULT:
4219                 return con_font_default(vc, op);
4220         case KD_FONT_OP_COPY:
4221                 return con_font_copy(vc, op);
4222         }
4223         return -ENOSYS;
4224 }
4225
4226 /*
4227  *      Interface exported to selection and vcs.
4228  */
4229
4230 /* used by selection */
4231 u16 screen_glyph(struct vc_data *vc, int offset)
4232 {
4233         u16 w = scr_readw(screenpos(vc, offset, 1));
4234         u16 c = w & 0xff;
4235
4236         if (w & vc->vc_hi_font_mask)
4237                 c |= 0x100;
4238         return c;
4239 }
4240 EXPORT_SYMBOL_GPL(screen_glyph);
4241
4242 /* used by vcs - note the word offset */
4243 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4244 {
4245         return screenpos(vc, 2 * w_offset, viewed);
4246 }
4247 EXPORT_SYMBOL_GPL(screen_pos);
4248
4249 void getconsxy(struct vc_data *vc, unsigned char *p)
4250 {
4251         p[0] = vc->vc_x;
4252         p[1] = vc->vc_y;
4253 }
4254
4255 void putconsxy(struct vc_data *vc, unsigned char *p)
4256 {
4257         hide_cursor(vc);
4258         gotoxy(vc, p[0], p[1]);
4259         set_cursor(vc);
4260 }
4261
4262 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4263 {
4264         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4265                 return softcursor_original;
4266         return scr_readw(org);
4267 }
4268
4269 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4270 {
4271         scr_writew(val, org);
4272         if ((unsigned long)org == vc->vc_pos) {
4273                 softcursor_original = -1;
4274                 add_softcursor(vc);
4275         }
4276 }
4277
4278 void vcs_scr_updated(struct vc_data *vc)
4279 {
4280         notify_update(vc);
4281 }
4282
4283 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4284                 unsigned int rolled_over, void *base, unsigned int size)
4285 {
4286         unsigned long ubase = (unsigned long)base;
4287         ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4288         ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4289         ptrdiff_t origin = (void *)c->vc_origin - base;
4290         int margin = c->vc_size_row * 4;
4291         int from, wrap, from_off, avail;
4292
4293         /* Turn scrollback off */
4294         if (!lines) {
4295                 c->vc_visible_origin = c->vc_origin;
4296                 return;
4297         }
4298
4299         /* Do we have already enough to allow jumping from 0 to the end? */
4300         if (rolled_over > scr_end + margin) {
4301                 from = scr_end;
4302                 wrap = rolled_over + c->vc_size_row;
4303         } else {
4304                 from = 0;
4305                 wrap = size;
4306         }
4307
4308         from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4309         avail = (origin - from + wrap) % wrap;
4310
4311         /* Only a little piece would be left? Show all incl. the piece! */
4312         if (avail < 2 * margin)
4313                 margin = 0;
4314         if (from_off < margin)
4315                 from_off = 0;
4316         if (from_off > avail - margin)
4317                 from_off = avail;
4318
4319         c->vc_visible_origin = ubase + (from + from_off) % wrap;
4320 }
4321 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4322
4323 /*
4324  *      Visible symbols for modules
4325  */
4326
4327 EXPORT_SYMBOL(color_table);
4328 EXPORT_SYMBOL(default_red);
4329 EXPORT_SYMBOL(default_grn);
4330 EXPORT_SYMBOL(default_blu);
4331 EXPORT_SYMBOL(update_region);
4332 EXPORT_SYMBOL(redraw_screen);
4333 EXPORT_SYMBOL(vc_resize);
4334 EXPORT_SYMBOL(fg_console);
4335 EXPORT_SYMBOL(console_blank_hook);
4336 EXPORT_SYMBOL(console_blanked);
4337 EXPORT_SYMBOL(vc_cons);
4338 EXPORT_SYMBOL(global_cursor_default);
4339 #ifndef VT_SINGLE_DRIVER
4340 EXPORT_SYMBOL(give_up_console);
4341 #endif