drivers/tty/vt/vt.c

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