drivers/tty/vt/vt.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright (C) 1991, 1992  Linus Torvalds
   4  */
   5
   6 /*
   7  * Hopefully this will be a rather complete VT102 implementation.
   8  *
   9  * Beeping thanks to John T Kohl.
  10  *
  11  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  12  *   Chars, and VT100 enhancements by Peter MacDonald.
  13  *
  14  * Copy and paste function by Andrew Haylett,
  15  *   some enhancements by Alessandro Rubini.
  16  *
  17  * Code to check for different video-cards mostly by Galen Hunt,
  18  * <g-hunt@ee.utah.edu>
  19  *
  20  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  21  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  22  *
  23  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  24  * Resizing of consoles, aeb, 940926
  25  *
  26  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  27  * <poe@daimi.aau.dk>
  28  *
  29  * User-defined bell sound, new setterm control sequences and printk
  30  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  31  *
  32  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  33  *
  34  * Merge with the abstract console driver by Geert Uytterhoeven
  35  * <geert@linux-m68k.org>, Jan 1997.
  36  *
  37  *   Original m68k console driver modifications by
  38  *
  39  *     - Arno Griffioen <arno@usn.nl>
  40  *     - David Carter <carter@cs.bris.ac.uk>
  41  *
  42  *   The abstract console driver provides a generic interface for a text
  43  *   console. It supports VGA text mode, frame buffer based graphical consoles
  44  *   and special graphics processors that are only accessible through some
  45  *   registers (e.g. a TMS340x0 GSP).
  46  *
  47  *   The interface to the hardware is specified using a special structure
  48  *   (struct consw) which contains function pointers to console operations
  49  *   (see <linux/console.h> for more information).
  50  *
  51  * Support for changeable cursor shape
  52  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  53  *
  54  * Ported to i386 and con_scrolldelta fixed
  55  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  56  *
  57  * Resurrected character buffers in videoram plus lots of other trickery
  58  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  59  *
  60  * Removed old-style timers, introduced console_timer, made timer
  61  * deletion SMP-safe.  17Jun00, Andrew Morton
  62  *
  63  * Removed console_lock, enabled interrupts across all console operations
  64  * 13 March 2001, Andrew Morton
  65  *
  66  * Fixed UTF-8 mode so alternate charset modes always work according
  67  * to control sequences interpreted in do_con_trol function
  68  * preserving backward VT100 semigraphics compatibility,
  69  * malformed UTF sequences represented as sequences of replacement glyphs,
  70  * original codes or '?' as a last resort if replacement glyph is undefined
  71  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  72  */
  73
  74 #include <linux/module.h>
  75 #include <linux/types.h>
  76 #include <linux/sched/signal.h>
  77 #include <linux/tty.h>
  78 #include <linux/tty_flip.h>
  79 #include <linux/kernel.h>
  80 #include <linux/string.h>
  81 #include <linux/errno.h>
  82 #include <linux/kd.h>
  83 #include <linux/slab.h>
  84 #include <linux/major.h>
  85 #include <linux/mm.h>
  86 #include <linux/console.h>
  87 #include <linux/init.h>
  88 #include <linux/mutex.h>
  89 #include <linux/vt_kern.h>
  90 #include <linux/selection.h>
  91 #include <linux/tiocl.h>
  92 #include <linux/kbd_kern.h>
  93 #include <linux/consolemap.h>
  94 #include <linux/timer.h>
  95 #include <linux/interrupt.h>
  96 #include <linux/workqueue.h>
  97 #include <linux/pm.h>
  98 #include <linux/font.h>
  99 #include <linux/bitops.h>
 100 #include <linux/notifier.h>
 101 #include <linux/device.h>
 102 #include <linux/io.h>
 103 #include <linux/uaccess.h>
 104 #include <linux/kdb.h>
 105 #include <linux/ctype.h>
 106 #include <linux/bsearch.h>
 107
 108 #define MAX_NR_CON_DRIVER 16
 109
 110 #define CON_DRIVER_FLAG_MODULE 1
 111 #define CON_DRIVER_FLAG_INIT   2
 112 #define CON_DRIVER_FLAG_ATTR   4
 113 #define CON_DRIVER_FLAG_ZOMBIE 8
 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 #define DEFAULT_CURSOR_BLINK_MS 200
 142
 143 struct vc vc_cons [MAX_NR_CONSOLES];
 144
 145 #ifndef VT_SINGLE_DRIVER
 146 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 147 #endif
 148
 149 static int con_open(struct tty_struct *, struct file *);
 150 static void vc_init(struct vc_data *vc, unsigned int rows,
 151                     unsigned int cols, int do_clear);
 152 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 153 static void save_cur(struct vc_data *vc);
 154 static void reset_terminal(struct vc_data *vc, int do_clear);
 155 static void con_flush_chars(struct tty_struct *tty);
 156 static int set_vesa_blanking(char __user *p);
 157 static void set_cursor(struct vc_data *vc);
 158 static void hide_cursor(struct vc_data *vc);
 159 static void console_callback(struct work_struct *ignored);
 160 static void con_driver_unregister_callback(struct work_struct *ignored);
 161 static void blank_screen_t(unsigned long dummy);
 162 static void set_palette(struct vc_data *vc);
 163
 164 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 165
 166 static int printable;           /* Is console ready for printing? */
 167 int default_utf8 = true;
 168 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 169 int global_cursor_default = -1;
 170 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 171
 172 static int cur_default = CUR_DEFAULT;
 173 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 174
 175 /*
 176  * ignore_poke: don't unblank the screen when things are typed.  This is
 177  * mainly for the privacy of braille terminal users.
 178  */
 179 static int ignore_poke;
 180
 181 int do_poke_blanked_console;
 182 int console_blanked;
 183
 184 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 185 static int vesa_off_interval;
 186 static int blankinterval;
 187 core_param(consoleblank, blankinterval, int, 0444);
 188
 189 static DECLARE_WORK(console_work, console_callback);
 190 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 191
 192 /*
 193  * fg_console is the current virtual console,
 194  * last_console is the last used one,
 195  * want_console is the console we want to switch to,
 196  * saved_* variants are for save/restore around kernel debugger enter/leave
 197  */
 198 int fg_console;
 199 int last_console;
 200 int want_console = -1;
 201 static int saved_fg_console;
 202 static int saved_last_console;
 203 static int saved_want_console;
 204 static int saved_vc_mode;
 205 static int saved_console_blanked;
 206
 207 /*
 208  * For each existing display, we have a pointer to console currently visible
 209  * on that display, allowing consoles other than fg_console to be refreshed
 210  * appropriately. Unless the low-level driver supplies its own display_fg
 211  * variable, we use this one for the "master display".
 212  */
 213 static struct vc_data *master_display_fg;
 214
 215 /*
 216  * Unfortunately, we need to delay tty echo when we're currently writing to the
 217  * console since the code is (and always was) not re-entrant, so we schedule
 218  * all flip requests to process context with schedule-task() and run it from
 219  * console_callback().
 220  */
 221
 222 /*
 223  * For the same reason, we defer scrollback to the console callback.
 224  */
 225 static int scrollback_delta;
 226
 227 /*
 228  * Hook so that the power management routines can (un)blank
 229  * the console on our behalf.
 230  */
 231 int (*console_blank_hook)(int);
 232
 233 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 234 static int blank_state;
 235 static int blank_timer_expired;
 236 enum {
 237         blank_off = 0,
 238         blank_normal_wait,
 239         blank_vesa_wait,
 240 };
 241
 242 /*
 243  * /sys/class/tty/tty0/
 244  *
 245  * the attribute 'active' contains the name of the current vc
 246  * console and it supports poll() to detect vc switches
 247  */
 248 static struct device *tty0dev;
 249
 250 /*
 251  * Notifier list for console events.
 252  */
 253 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 254
 255 int register_vt_notifier(struct notifier_block *nb)
 256 {
 257         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 258 }
 259 EXPORT_SYMBOL_GPL(register_vt_notifier);
 260
 261 int unregister_vt_notifier(struct notifier_block *nb)
 262 {
 263         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 264 }
 265 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 266
 267 static void notify_write(struct vc_data *vc, unsigned int unicode)
 268 {
 269         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 270         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 271 }
 272
 273 static void notify_update(struct vc_data *vc)
 274 {
 275         struct vt_notifier_param param = { .vc = vc };
 276         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 277 }
 278 /*
 279  *      Low-Level Functions
 280  */
 281
 282 static inline bool con_is_fg(const struct vc_data *vc)
 283 {
 284         return vc->vc_num == fg_console;
 285 }
 286
 287 static inline bool con_should_update(const struct vc_data *vc)
 288 {
 289         return con_is_visible(vc) && !console_blanked;
 290 }
 291
 292 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 293 {
 294         unsigned short *p;
 295
 296         if (!viewed)
 297                 p = (unsigned short *)(vc->vc_origin + offset);
 298         else if (!vc->vc_sw->con_screen_pos)
 299                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 300         else
 301                 p = vc->vc_sw->con_screen_pos(vc, offset);
 302         return p;
 303 }
 304
 305 /* Called  from the keyboard irq path.. */
 306 static inline void scrolldelta(int lines)
 307 {
 308         /* FIXME */
 309         /* scrolldelta needs some kind of consistency lock, but the BKL was
 310            and still is not protecting versus the scheduled back end */
 311         scrollback_delta += lines;
 312         schedule_console_callback();
 313 }
 314
 315 void schedule_console_callback(void)
 316 {
 317         schedule_work(&console_work);
 318 }
 319
 320 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 321                 enum con_scroll dir, unsigned int nr)
 322 {
 323         u16 *clear, *d, *s;
 324
 325         if (t + nr >= b)
 326                 nr = b - t - 1;
 327         if (b > vc->vc_rows || t >= b || nr < 1)
 328                 return;
 329         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
 330                 return;
 331
 332         s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
 333         d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 334
 335         if (dir == SM_UP) {
 336                 clear = s + (b - t - nr) * vc->vc_cols;
 337                 swap(s, d);
 338         }
 339         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 340         scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
 341 }
 342
 343 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 344 {
 345         unsigned int xx, yy, offset;
 346         u16 *p;
 347
 348         p = (u16 *) start;
 349         if (!vc->vc_sw->con_getxy) {
 350                 offset = (start - vc->vc_origin) / 2;
 351                 xx = offset % vc->vc_cols;
 352                 yy = offset / vc->vc_cols;
 353         } else {
 354                 int nxx, nyy;
 355                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 356                 xx = nxx; yy = nyy;
 357         }
 358         for(;;) {
 359                 u16 attrib = scr_readw(p) & 0xff00;
 360                 int startx = xx;
 361                 u16 *q = p;
 362                 while (xx < vc->vc_cols && count) {
 363                         if (attrib != (scr_readw(p) & 0xff00)) {
 364                                 if (p > q)
 365                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 366                                 startx = xx;
 367                                 q = p;
 368                                 attrib = scr_readw(p) & 0xff00;
 369                         }
 370                         p++;
 371                         xx++;
 372                         count--;
 373                 }
 374                 if (p > q)
 375                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 376                 if (!count)
 377                         break;
 378                 xx = 0;
 379                 yy++;
 380                 if (vc->vc_sw->con_getxy) {
 381                         p = (u16 *)start;
 382                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 383                 }
 384         }
 385 }
 386
 387 void update_region(struct vc_data *vc, unsigned long start, int count)
 388 {
 389         WARN_CONSOLE_UNLOCKED();
 390
 391         if (con_should_update(vc)) {
 392                 hide_cursor(vc);
 393                 do_update_region(vc, start, count);
 394                 set_cursor(vc);
 395         }
 396 }
 397
 398 /* Structure of attributes is hardware-dependent */
 399
 400 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 401     u8 _underline, u8 _reverse, u8 _italic)
 402 {
 403         if (vc->vc_sw->con_build_attr)
 404                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 405                        _blink, _underline, _reverse, _italic);
 406
 407 /*
 408  * ++roman: I completely changed the attribute format for monochrome
 409  * mode (!can_do_color). The formerly used MDA (monochrome display
 410  * adapter) format didn't allow the combination of certain effects.
 411  * Now the attribute is just a bit vector:
 412  *  Bit 0..1: intensity (0..2)
 413  *  Bit 2   : underline
 414  *  Bit 3   : reverse
 415  *  Bit 7   : blink
 416  */
 417         {
 418         u8 a = _color;
 419         if (!vc->vc_can_do_color)
 420                 return _intensity |
 421                        (_italic ? 2 : 0) |
 422                        (_underline ? 4 : 0) |
 423                        (_reverse ? 8 : 0) |
 424                        (_blink ? 0x80 : 0);
 425         if (_italic)
 426                 a = (a & 0xF0) | vc->vc_itcolor;
 427         else if (_underline)
 428                 a = (a & 0xf0) | vc->vc_ulcolor;
 429         else if (_intensity == 0)
 430                 a = (a & 0xf0) | vc->vc_halfcolor;
 431         if (_reverse)
 432                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 433         if (_blink)
 434                 a ^= 0x80;
 435         if (_intensity == 2)
 436                 a ^= 0x08;
 437         if (vc->vc_hi_font_mask == 0x100)
 438                 a <<= 1;
 439         return a;
 440         }
 441 }
 442
 443 static void update_attr(struct vc_data *vc)
 444 {
 445         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 446                       vc->vc_blink, vc->vc_underline,
 447                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 448         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 449 }
 450
 451 /* Note: inverting the screen twice should revert to the original state */
 452 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 453 {
 454         unsigned short *p;
 455
 456         WARN_CONSOLE_UNLOCKED();
 457
 458         count /= 2;
 459         p = screenpos(vc, offset, viewed);
 460         if (vc->vc_sw->con_invert_region) {
 461                 vc->vc_sw->con_invert_region(vc, p, count);
 462         } else {
 463                 u16 *q = p;
 464                 int cnt = count;
 465                 u16 a;
 466
 467                 if (!vc->vc_can_do_color) {
 468                         while (cnt--) {
 469                             a = scr_readw(q);
 470                             a ^= 0x0800;
 471                             scr_writew(a, q);
 472                             q++;
 473                         }
 474                 } else if (vc->vc_hi_font_mask == 0x100) {
 475                         while (cnt--) {
 476                                 a = scr_readw(q);
 477                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 478                                 scr_writew(a, q);
 479                                 q++;
 480                         }
 481                 } else {
 482                         while (cnt--) {
 483                                 a = scr_readw(q);
 484                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 485                                 scr_writew(a, q);
 486                                 q++;
 487                         }
 488                 }
 489         }
 490
 491         if (con_should_update(vc))
 492                 do_update_region(vc, (unsigned long) p, count);
 493         notify_update(vc);
 494 }
 495
 496 /* used by selection: complement pointer position */
 497 void complement_pos(struct vc_data *vc, int offset)
 498 {
 499         static int old_offset = -1;
 500         static unsigned short old;
 501         static unsigned short oldx, oldy;
 502
 503         WARN_CONSOLE_UNLOCKED();
 504
 505         if (old_offset != -1 && old_offset >= 0 &&
 506             old_offset < vc->vc_screenbuf_size) {
 507                 scr_writew(old, screenpos(vc, old_offset, 1));
 508                 if (con_should_update(vc))
 509                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 510                 notify_update(vc);
 511         }
 512
 513         old_offset = offset;
 514
 515         if (offset != -1 && offset >= 0 &&
 516             offset < vc->vc_screenbuf_size) {
 517                 unsigned short new;
 518                 unsigned short *p;
 519                 p = screenpos(vc, offset, 1);
 520                 old = scr_readw(p);
 521                 new = old ^ vc->vc_complement_mask;
 522                 scr_writew(new, p);
 523                 if (con_should_update(vc)) {
 524                         oldx = (offset >> 1) % vc->vc_cols;
 525                         oldy = (offset >> 1) / vc->vc_cols;
 526                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 527                 }
 528                 notify_update(vc);
 529         }
 530 }
 531
 532 static void insert_char(struct vc_data *vc, unsigned int nr)
 533 {
 534         unsigned short *p = (unsigned short *) vc->vc_pos;
 535
 536         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 537         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 538         vc->vc_need_wrap = 0;
 539         if (con_should_update(vc))
 540                 do_update_region(vc, (unsigned long) p,
 541                         vc->vc_cols - vc->vc_x);
 542 }
 543
 544 static void delete_char(struct vc_data *vc, unsigned int nr)
 545 {
 546         unsigned short *p = (unsigned short *) vc->vc_pos;
 547
 548         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 549         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 550                         nr * 2);
 551         vc->vc_need_wrap = 0;
 552         if (con_should_update(vc))
 553                 do_update_region(vc, (unsigned long) p,
 554                         vc->vc_cols - vc->vc_x);
 555 }
 556
 557 static int softcursor_original = -1;
 558
 559 static void add_softcursor(struct vc_data *vc)
 560 {
 561         int i = scr_readw((u16 *) vc->vc_pos);
 562         u32 type = vc->vc_cursor_type;
 563
 564         if (! (type & 0x10)) return;
 565         if (softcursor_original != -1) return;
 566         softcursor_original = i;
 567         i |= ((type >> 8) & 0xff00 );
 568         i ^= ((type) & 0xff00 );
 569         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 570         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 571         scr_writew(i, (u16 *) vc->vc_pos);
 572         if (con_should_update(vc))
 573                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 574 }
 575
 576 static void hide_softcursor(struct vc_data *vc)
 577 {
 578         if (softcursor_original != -1) {
 579                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 580                 if (con_should_update(vc))
 581                         vc->vc_sw->con_putc(vc, softcursor_original,
 582                                         vc->vc_y, vc->vc_x);
 583                 softcursor_original = -1;
 584         }
 585 }
 586
 587 static void hide_cursor(struct vc_data *vc)
 588 {
 589         if (vc == sel_cons)
 590                 clear_selection();
 591         vc->vc_sw->con_cursor(vc, CM_ERASE);
 592         hide_softcursor(vc);
 593 }
 594
 595 static void set_cursor(struct vc_data *vc)
 596 {
 597         if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
 598                 return;
 599         if (vc->vc_deccm) {
 600                 if (vc == sel_cons)
 601                         clear_selection();
 602                 add_softcursor(vc);
 603                 if ((vc->vc_cursor_type & 0x0f) != 1)
 604                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 605         } else
 606                 hide_cursor(vc);
 607 }
 608
 609 static void set_origin(struct vc_data *vc)
 610 {
 611         WARN_CONSOLE_UNLOCKED();
 612
 613         if (!con_is_visible(vc) ||
 614             !vc->vc_sw->con_set_origin ||
 615             !vc->vc_sw->con_set_origin(vc))
 616                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 617         vc->vc_visible_origin = vc->vc_origin;
 618         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 619         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 620 }
 621
 622 static void save_screen(struct vc_data *vc)
 623 {
 624         WARN_CONSOLE_UNLOCKED();
 625
 626         if (vc->vc_sw->con_save_screen)
 627                 vc->vc_sw->con_save_screen(vc);
 628 }
 629
 630 static void flush_scrollback(struct vc_data *vc)
 631 {
 632         WARN_CONSOLE_UNLOCKED();
 633
 634         if (vc->vc_sw->con_flush_scrollback)
 635                 vc->vc_sw->con_flush_scrollback(vc);
 636 }
 637
 638 /*
 639  *      Redrawing of screen
 640  */
 641
 642 void clear_buffer_attributes(struct vc_data *vc)
 643 {
 644         unsigned short *p = (unsigned short *)vc->vc_origin;
 645         int count = vc->vc_screenbuf_size / 2;
 646         int mask = vc->vc_hi_font_mask | 0xff;
 647
 648         for (; count > 0; count--, p++) {
 649                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 650         }
 651 }
 652
 653 void redraw_screen(struct vc_data *vc, int is_switch)
 654 {
 655         int redraw = 0;
 656
 657         WARN_CONSOLE_UNLOCKED();
 658
 659         if (!vc) {
 660                 /* strange ... */
 661                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 662                 return;
 663         }
 664
 665         if (is_switch) {
 666                 struct vc_data *old_vc = vc_cons[fg_console].d;
 667                 if (old_vc == vc)
 668                         return;
 669                 if (!con_is_visible(vc))
 670                         redraw = 1;
 671                 *vc->vc_display_fg = vc;
 672                 fg_console = vc->vc_num;
 673                 hide_cursor(old_vc);
 674                 if (!con_is_visible(old_vc)) {
 675                         save_screen(old_vc);
 676                         set_origin(old_vc);
 677                 }
 678                 if (tty0dev)
 679                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 680         } else {
 681                 hide_cursor(vc);
 682                 redraw = 1;
 683         }
 684
 685         if (redraw) {
 686                 int update;
 687                 int old_was_color = vc->vc_can_do_color;
 688
 689                 set_origin(vc);
 690                 update = vc->vc_sw->con_switch(vc);
 691                 set_palette(vc);
 692                 /*
 693                  * If console changed from mono<->color, the best we can do
 694                  * is to clear the buffer attributes. As it currently stands,
 695                  * rebuilding new attributes from the old buffer is not doable
 696                  * without overly complex code.
 697                  */
 698                 if (old_was_color != vc->vc_can_do_color) {
 699                         update_attr(vc);
 700                         clear_buffer_attributes(vc);
 701                 }
 702
 703                 /* Forcibly update if we're panicing */
 704                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 705                     vt_force_oops_output(vc))
 706                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 707         }
 708         set_cursor(vc);
 709         if (is_switch) {
 710                 set_leds();
 711                 compute_shiftstate();
 712                 notify_update(vc);
 713         }
 714 }
 715
 716 /*
 717  *      Allocation, freeing and resizing of VTs.
 718  */
 719
 720 int vc_cons_allocated(unsigned int i)
 721 {
 722         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 723 }
 724
 725 static void visual_init(struct vc_data *vc, int num, int init)
 726 {
 727         /* ++Geert: vc->vc_sw->con_init determines console size */
 728         if (vc->vc_sw)
 729                 module_put(vc->vc_sw->owner);
 730         vc->vc_sw = conswitchp;
 731 #ifndef VT_SINGLE_DRIVER
 732         if (con_driver_map[num])
 733                 vc->vc_sw = con_driver_map[num];
 734 #endif
 735         __module_get(vc->vc_sw->owner);
 736         vc->vc_num = num;
 737         vc->vc_display_fg = &master_display_fg;
 738         if (vc->vc_uni_pagedir_loc)
 739                 con_free_unimap(vc);
 740         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 741         vc->vc_uni_pagedir = NULL;
 742         vc->vc_hi_font_mask = 0;
 743         vc->vc_complement_mask = 0;
 744         vc->vc_can_do_color = 0;
 745         vc->vc_panic_force_write = false;
 746         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
 747         vc->vc_sw->con_init(vc, init);
 748         if (!vc->vc_complement_mask)
 749                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 750         vc->vc_s_complement_mask = vc->vc_complement_mask;
 751         vc->vc_size_row = vc->vc_cols << 1;
 752         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 753 }
 754
 755 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 756 {
 757         struct vt_notifier_param param;
 758         struct vc_data *vc;
 759
 760         WARN_CONSOLE_UNLOCKED();
 761
 762         if (currcons >= MAX_NR_CONSOLES)
 763                 return -ENXIO;
 764
 765         if (vc_cons[currcons].d)
 766                 return 0;
 767
 768         /* due to the granularity of kmalloc, we waste some memory here */
 769         /* the alloc is done in two steps, to optimize the common situation
 770            of a 25x80 console (structsize=216, screenbuf_size=4000) */
 771         /* although the numbers above are not valid since long ago, the
 772            point is still up-to-date and the comment still has its value
 773            even if only as a historical artifact.  --mj, July 1998 */
 774         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 775         if (!vc)
 776                 return -ENOMEM;
 777
 778         vc_cons[currcons].d = vc;
 779         tty_port_init(&vc->port);
 780         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 781
 782         visual_init(vc, currcons, 1);
 783
 784         if (!*vc->vc_uni_pagedir_loc)
 785                 con_set_default_unimap(vc);
 786
 787         vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 788         if (!vc->vc_screenbuf)
 789                 goto err_free;
 790
 791         /* If no drivers have overridden us and the user didn't pass a
 792            boot option, default to displaying the cursor */
 793         if (global_cursor_default == -1)
 794                 global_cursor_default = 1;
 795
 796         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 797         vcs_make_sysfs(currcons);
 798         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 799
 800         return 0;
 801 err_free:
 802         kfree(vc);
 803         vc_cons[currcons].d = NULL;
 804         return -ENOMEM;
 805 }
 806
 807 static inline int resize_screen(struct vc_data *vc, int width, int height,
 808                                 int user)
 809 {
 810         /* Resizes the resolution of the display adapater */
 811         int err = 0;
 812
 813         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 814                 err = vc->vc_sw->con_resize(vc, width, height, user);
 815
 816         return err;
 817 }
 818
 819 /*
 820  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 821  * [this is to be used together with some user program
 822  * like resize that changes the hardware videomode]
 823  */
 824 #define VC_RESIZE_MAXCOL (32767)
 825 #define VC_RESIZE_MAXROW (32767)
 826
 827 /**
 828  *      vc_do_resize    -       resizing method for the tty
 829  *      @tty: tty being resized
 830  *      @real_tty: real tty (different to tty if a pty/tty pair)
 831  *      @vc: virtual console private data
 832  *      @cols: columns
 833  *      @lines: lines
 834  *
 835  *      Resize a virtual console, clipping according to the actual constraints.
 836  *      If the caller passes a tty structure then update the termios winsize
 837  *      information and perform any necessary signal handling.
 838  *
 839  *      Caller must hold the console semaphore. Takes the termios rwsem and
 840  *      ctrl_lock of the tty IFF a tty is passed.
 841  */
 842
 843 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 844                                 unsigned int cols, unsigned int lines)
 845 {
 846         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 847         unsigned long end;
 848         unsigned int old_rows, old_row_size;
 849         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 850         unsigned int user;
 851         unsigned short *newscreen;
 852
 853         WARN_CONSOLE_UNLOCKED();
 854
 855         if (!vc)
 856                 return -ENXIO;
 857
 858         user = vc->vc_resize_user;
 859         vc->vc_resize_user = 0;
 860
 861         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 862                 return -EINVAL;
 863
 864         new_cols = (cols ? cols : vc->vc_cols);
 865         new_rows = (lines ? lines : vc->vc_rows);
 866         new_row_size = new_cols << 1;
 867         new_screen_size = new_row_size * new_rows;
 868
 869         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 870                 return 0;
 871
 872         if (new_screen_size > (4 << 20))
 873                 return -EINVAL;
 874         newscreen = kmalloc(new_screen_size, GFP_USER);
 875         if (!newscreen)
 876                 return -ENOMEM;
 877
 878         if (vc == sel_cons)
 879                 clear_selection();
 880
 881         old_rows = vc->vc_rows;
 882         old_row_size = vc->vc_size_row;
 883
 884         err = resize_screen(vc, new_cols, new_rows, user);
 885         if (err) {
 886                 kfree(newscreen);
 887                 return err;
 888         }
 889
 890         vc->vc_rows = new_rows;
 891         vc->vc_cols = new_cols;
 892         vc->vc_size_row = new_row_size;
 893         vc->vc_screenbuf_size = new_screen_size;
 894
 895         rlth = min(old_row_size, new_row_size);
 896         rrem = new_row_size - rlth;
 897         old_origin = vc->vc_origin;
 898         new_origin = (long) newscreen;
 899         new_scr_end = new_origin + new_screen_size;
 900
 901         if (vc->vc_y > new_rows) {
 902                 if (old_rows - vc->vc_y < new_rows) {
 903                         /*
 904                          * Cursor near the bottom, copy contents from the
 905                          * bottom of buffer
 906                          */
 907                         old_origin += (old_rows - new_rows) * old_row_size;
 908                 } else {
 909                         /*
 910                          * Cursor is in no man's land, copy 1/2 screenful
 911                          * from the top and bottom of cursor position
 912                          */
 913                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 914                 }
 915         }
 916
 917         end = old_origin + old_row_size * min(old_rows, new_rows);
 918
 919         update_attr(vc);
 920
 921         while (old_origin < end) {
 922                 scr_memcpyw((unsigned short *) new_origin,
 923                             (unsigned short *) old_origin, rlth);
 924                 if (rrem)
 925                         scr_memsetw((void *)(new_origin + rlth),
 926                                     vc->vc_video_erase_char, rrem);
 927                 old_origin += old_row_size;
 928                 new_origin += new_row_size;
 929         }
 930         if (new_scr_end > new_origin)
 931                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 932                             new_scr_end - new_origin);
 933         kfree(vc->vc_screenbuf);
 934         vc->vc_screenbuf = newscreen;
 935         vc->vc_screenbuf_size = new_screen_size;
 936         set_origin(vc);
 937
 938         /* do part of a reset_terminal() */
 939         vc->vc_top = 0;
 940         vc->vc_bottom = vc->vc_rows;
 941         gotoxy(vc, vc->vc_x, vc->vc_y);
 942         save_cur(vc);
 943
 944         if (tty) {
 945                 /* Rewrite the requested winsize data with the actual
 946                    resulting sizes */
 947                 struct winsize ws;
 948                 memset(&ws, 0, sizeof(ws));
 949                 ws.ws_row = vc->vc_rows;
 950                 ws.ws_col = vc->vc_cols;
 951                 ws.ws_ypixel = vc->vc_scan_lines;
 952                 tty_do_resize(tty, &ws);
 953         }
 954
 955         if (con_is_visible(vc))
 956                 update_screen(vc);
 957         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 958         return err;
 959 }
 960
 961 /**
 962  *      vc_resize               -       resize a VT
 963  *      @vc: virtual console
 964  *      @cols: columns
 965  *      @rows: rows
 966  *
 967  *      Resize a virtual console as seen from the console end of things. We
 968  *      use the common vc_do_resize methods to update the structures. The
 969  *      caller must hold the console sem to protect console internals and
 970  *      vc->port.tty
 971  */
 972
 973 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 974 {
 975         return vc_do_resize(vc->port.tty, vc, cols, rows);
 976 }
 977
 978 /**
 979  *      vt_resize               -       resize a VT
 980  *      @tty: tty to resize
 981  *      @ws: winsize attributes
 982  *
 983  *      Resize a virtual terminal. This is called by the tty layer as we
 984  *      register our own handler for resizing. The mutual helper does all
 985  *      the actual work.
 986  *
 987  *      Takes the console sem and the called methods then take the tty
 988  *      termios_rwsem and the tty ctrl_lock in that order.
 989  */
 990 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 991 {
 992         struct vc_data *vc = tty->driver_data;
 993         int ret;
 994
 995         console_lock();
 996         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 997         console_unlock();
 998         return ret;
 999 }
1000
1001 struct vc_data *vc_deallocate(unsigned int currcons)
1002 {
1003         struct vc_data *vc = NULL;
1004
1005         WARN_CONSOLE_UNLOCKED();
1006
1007         if (vc_cons_allocated(currcons)) {
1008                 struct vt_notifier_param param;
1009
1010                 param.vc = vc = vc_cons[currcons].d;
1011                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1012                 vcs_remove_sysfs(currcons);
1013                 vc->vc_sw->con_deinit(vc);
1014                 put_pid(vc->vt_pid);
1015                 module_put(vc->vc_sw->owner);
1016                 kfree(vc->vc_screenbuf);
1017                 vc_cons[currcons].d = NULL;
1018         }
1019         return vc;
1020 }
1021
1022 /*
1023  *      VT102 emulator
1024  */
1025
1026 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1027 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1028 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1029
1030 #define decarm          VC_REPEAT
1031 #define decckm          VC_CKMODE
1032 #define kbdapplic       VC_APPLIC
1033 #define lnm             VC_CRLF
1034
1035 /*
1036  * this is what the terminal answers to a ESC-Z or csi0c query.
1037  */
1038 #define VT100ID "\033[?1;2c"
1039 #define VT102ID "\033[?6c"
1040
1041 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1042                                        8,12,10,14, 9,13,11,15 };
1043
1044 /* the default colour table, for VGA+ colour systems */
1045 unsigned char default_red[] = {
1046         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1047         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1048 };
1049 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1050
1051 unsigned char default_grn[] = {
1052         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1053         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1054 };
1055 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1056
1057 unsigned char default_blu[] = {
1058         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1059         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1060 };
1061 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1062
1063 /*
1064  * gotoxy() must verify all boundaries, because the arguments
1065  * might also be negative. If the given position is out of
1066  * bounds, the cursor is placed at the nearest margin.
1067  */
1068 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1069 {
1070         int min_y, max_y;
1071
1072         if (new_x < 0)
1073                 vc->vc_x = 0;
1074         else {
1075                 if (new_x >= vc->vc_cols)
1076                         vc->vc_x = vc->vc_cols - 1;
1077                 else
1078                         vc->vc_x = new_x;
1079         }
1080
1081         if (vc->vc_decom) {
1082                 min_y = vc->vc_top;
1083                 max_y = vc->vc_bottom;
1084         } else {
1085                 min_y = 0;
1086                 max_y = vc->vc_rows;
1087         }
1088         if (new_y < min_y)
1089                 vc->vc_y = min_y;
1090         else if (new_y >= max_y)
1091                 vc->vc_y = max_y - 1;
1092         else
1093                 vc->vc_y = new_y;
1094         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1095         vc->vc_need_wrap = 0;
1096 }
1097
1098 /* for absolute user moves, when decom is set */
1099 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1100 {
1101         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1102 }
1103
1104 void scrollback(struct vc_data *vc)
1105 {
1106         scrolldelta(-(vc->vc_rows / 2));
1107 }
1108
1109 void scrollfront(struct vc_data *vc, int lines)
1110 {
1111         if (!lines)
1112                 lines = vc->vc_rows / 2;
1113         scrolldelta(lines);
1114 }
1115
1116 static void lf(struct vc_data *vc)
1117 {
1118         /* don't scroll if above bottom of scrolling region, or
1119          * if below scrolling region
1120          */
1121         if (vc->vc_y + 1 == vc->vc_bottom)
1122                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1123         else if (vc->vc_y < vc->vc_rows - 1) {
1124                 vc->vc_y++;
1125                 vc->vc_pos += vc->vc_size_row;
1126         }
1127         vc->vc_need_wrap = 0;
1128         notify_write(vc, '\n');
1129 }
1130
1131 static void ri(struct vc_data *vc)
1132 {
1133         /* don't scroll if below top of scrolling region, or
1134          * if above scrolling region
1135          */
1136         if (vc->vc_y == vc->vc_top)
1137                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1138         else if (vc->vc_y > 0) {
1139                 vc->vc_y--;
1140                 vc->vc_pos -= vc->vc_size_row;
1141         }
1142         vc->vc_need_wrap = 0;
1143 }
1144
1145 static inline void cr(struct vc_data *vc)
1146 {
1147         vc->vc_pos -= vc->vc_x << 1;
1148         vc->vc_need_wrap = vc->vc_x = 0;
1149         notify_write(vc, '\r');
1150 }
1151
1152 static inline void bs(struct vc_data *vc)
1153 {
1154         if (vc->vc_x) {
1155                 vc->vc_pos -= 2;
1156                 vc->vc_x--;
1157                 vc->vc_need_wrap = 0;
1158                 notify_write(vc, '\b');
1159         }
1160 }
1161
1162 static inline void del(struct vc_data *vc)
1163 {
1164         /* ignored */
1165 }
1166
1167 static void csi_J(struct vc_data *vc, int vpar)
1168 {
1169         unsigned int count;
1170         unsigned short * start;
1171
1172         switch (vpar) {
1173                 case 0: /* erase from cursor to end of display */
1174                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1175                         start = (unsigned short *)vc->vc_pos;
1176                         break;
1177                 case 1: /* erase from start to cursor */
1178                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1179                         start = (unsigned short *)vc->vc_origin;
1180                         break;
1181                 case 3: /* erase scroll-back buffer (and whole display) */
1182                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1183                                     vc->vc_screenbuf_size);
1184                         flush_scrollback(vc);
1185                         set_origin(vc);
1186                         if (con_is_visible(vc))
1187                                 update_screen(vc);
1188                         /* fall through */
1189                 case 2: /* erase whole display */
1190                         count = vc->vc_cols * vc->vc_rows;
1191                         start = (unsigned short *)vc->vc_origin;
1192                         break;
1193                 default:
1194                         return;
1195         }
1196         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1197         if (con_should_update(vc))
1198                 do_update_region(vc, (unsigned long) start, count);
1199         vc->vc_need_wrap = 0;
1200 }
1201
1202 static void csi_K(struct vc_data *vc, int vpar)
1203 {
1204         unsigned int count;
1205         unsigned short * start;
1206
1207         switch (vpar) {
1208                 case 0: /* erase from cursor to end of line */
1209                         count = vc->vc_cols - vc->vc_x;
1210                         start = (unsigned short *)vc->vc_pos;
1211                         break;
1212                 case 1: /* erase from start of line to cursor */
1213                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1214                         count = vc->vc_x + 1;
1215                         break;
1216                 case 2: /* erase whole line */
1217                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1218                         count = vc->vc_cols;
1219                         break;
1220                 default:
1221                         return;
1222         }
1223         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1224         vc->vc_need_wrap = 0;
1225         if (con_should_update(vc))
1226                 do_update_region(vc, (unsigned long) start, count);
1227 }
1228
1229 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1230 {                                         /* not vt100? */
1231         int count;
1232
1233         if (!vpar)
1234                 vpar++;
1235         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1236
1237         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1238         if (con_should_update(vc))
1239                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1240         vc->vc_need_wrap = 0;
1241 }
1242
1243 static void default_attr(struct vc_data *vc)
1244 {
1245         vc->vc_intensity = 1;
1246         vc->vc_italic = 0;
1247         vc->vc_underline = 0;
1248         vc->vc_reverse = 0;
1249         vc->vc_blink = 0;
1250         vc->vc_color = vc->vc_def_color;
1251 }
1252
1253 struct rgb { u8 r; u8 g; u8 b; };
1254
1255 static void rgb_from_256(int i, struct rgb *c)
1256 {
1257         if (i < 8) {            /* Standard colours. */
1258                 c->r = i&1 ? 0xaa : 0x00;
1259                 c->g = i&2 ? 0xaa : 0x00;
1260                 c->b = i&4 ? 0xaa : 0x00;
1261         } else if (i < 16) {
1262                 c->r = i&1 ? 0xff : 0x55;
1263                 c->g = i&2 ? 0xff : 0x55;
1264                 c->b = i&4 ? 0xff : 0x55;
1265         } else if (i < 232) {   /* 6x6x6 colour cube. */
1266                 c->r = (i - 16) / 36 * 85 / 2;
1267                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1268                 c->b = (i - 16) % 6 * 85 / 2;
1269         } else                  /* Grayscale ramp. */
1270                 c->r = c->g = c->b = i * 10 - 2312;
1271 }
1272
1273 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1274 {
1275         u8 hue = 0, max = max3(c->r, c->g, c->b);
1276
1277         if (c->r > max / 2)
1278                 hue |= 4;
1279         if (c->g > max / 2)
1280                 hue |= 2;
1281         if (c->b > max / 2)
1282                 hue |= 1;
1283
1284         if (hue == 7 && max <= 0x55) {
1285                 hue = 0;
1286                 vc->vc_intensity = 2;
1287         } else if (max > 0xaa)
1288                 vc->vc_intensity = 2;
1289         else
1290                 vc->vc_intensity = 1;
1291
1292         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1293 }
1294
1295 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1296 {
1297         /* For backgrounds, err on the dark side. */
1298         vc->vc_color = (vc->vc_color & 0x0f)
1299                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1300 }
1301
1302 /*
1303  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1304  * and thus need to be detected and ignored by hand. Strictly speaking, that
1305  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1306  * no one produces such codes and almost no one accepts them.
1307  *
1308  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1309  * supporting them.
1310  */
1311 static int vc_t416_color(struct vc_data *vc, int i,
1312                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1313 {
1314         struct rgb c;
1315
1316         i++;
1317         if (i > vc->vc_npar)
1318                 return i;
1319
1320         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1321                 /* 256 colours */
1322                 i++;
1323                 rgb_from_256(vc->vc_par[i], &c);
1324         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1325                 /* 24 bit */
1326                 c.r = vc->vc_par[i + 1];
1327                 c.g = vc->vc_par[i + 2];
1328                 c.b = vc->vc_par[i + 3];
1329                 i += 3;
1330         } else
1331                 return i;
1332
1333         set_color(vc, &c);
1334
1335         return i;
1336 }
1337
1338 /* console_lock is held */
1339 static void csi_m(struct vc_data *vc)
1340 {
1341         int i;
1342
1343         for (i = 0; i <= vc->vc_npar; i++)
1344                 switch (vc->vc_par[i]) {
1345                 case 0: /* all attributes off */
1346                         default_attr(vc);
1347                         break;
1348                 case 1:
1349                         vc->vc_intensity = 2;
1350                         break;
1351                 case 2:
1352                         vc->vc_intensity = 0;
1353                         break;
1354                 case 3:
1355                         vc->vc_italic = 1;
1356                         break;
1357                 case 4:
1358                         vc->vc_underline = 1;
1359                         break;
1360                 case 5:
1361                         vc->vc_blink = 1;
1362                         break;
1363                 case 7:
1364                         vc->vc_reverse = 1;
1365                         break;
1366                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1367                           * Select primary font, don't display control chars if
1368                           * defined, don't set bit 8 on output.
1369                           */
1370                         vc->vc_translate = set_translate(vc->vc_charset == 0
1371                                         ? vc->vc_G0_charset
1372                                         : vc->vc_G1_charset, vc);
1373                         vc->vc_disp_ctrl = 0;
1374                         vc->vc_toggle_meta = 0;
1375                         break;
1376                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1377                           * Select first alternate font, lets chars < 32 be
1378                           * displayed as ROM chars.
1379                           */
1380                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1381                         vc->vc_disp_ctrl = 1;
1382                         vc->vc_toggle_meta = 0;
1383                         break;
1384                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1385                           * Select second alternate font, toggle high bit
1386                           * before displaying as ROM char.
1387                           */
1388                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1389                         vc->vc_disp_ctrl = 1;
1390                         vc->vc_toggle_meta = 1;
1391                         break;
1392                 case 21:
1393                 case 22:
1394                         vc->vc_intensity = 1;
1395                         break;
1396                 case 23:
1397                         vc->vc_italic = 0;
1398                         break;
1399                 case 24:
1400                         vc->vc_underline = 0;
1401                         break;
1402                 case 25:
1403                         vc->vc_blink = 0;
1404                         break;
1405                 case 27:
1406                         vc->vc_reverse = 0;
1407                         break;
1408                 case 38:
1409                         i = vc_t416_color(vc, i, rgb_foreground);
1410                         break;
1411                 case 48:
1412                         i = vc_t416_color(vc, i, rgb_background);
1413                         break;
1414                 case 39:
1415                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1416                                 (vc->vc_color & 0xf0);
1417                         break;
1418                 case 49:
1419                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1420                                 (vc->vc_color & 0x0f);
1421                         break;
1422                 default:
1423                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1424                                 if (vc->vc_par[i] < 100)
1425                                         vc->vc_intensity = 2;
1426                                 vc->vc_par[i] -= 60;
1427                         }
1428                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1429                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1430                                         | (vc->vc_color & 0xf0);
1431                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1432                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1433                                         | (vc->vc_color & 0x0f);
1434                         break;
1435                 }
1436         update_attr(vc);
1437 }
1438
1439 static void respond_string(const char *p, struct tty_port *port)
1440 {
1441         while (*p) {
1442                 tty_insert_flip_char(port, *p, 0);
1443                 p++;
1444         }
1445         tty_schedule_flip(port);
1446 }
1447
1448 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1449 {
1450         char buf[40];
1451
1452         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1453         respond_string(buf, tty->port);
1454 }
1455
1456 static inline void status_report(struct tty_struct *tty)
1457 {
1458         respond_string("\033[0n", tty->port);   /* Terminal ok */
1459 }
1460
1461 static inline void respond_ID(struct tty_struct *tty)
1462 {
1463         respond_string(VT102ID, tty->port);
1464 }
1465
1466 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1467 {
1468         char buf[8];
1469
1470         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1471                 (char)('!' + mry));
1472         respond_string(buf, tty->port);
1473 }
1474
1475 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1476 int mouse_reporting(void)
1477 {
1478         return vc_cons[fg_console].d->vc_report_mouse;
1479 }
1480
1481 /* console_lock is held */
1482 static void set_mode(struct vc_data *vc, int on_off)
1483 {
1484         int i;
1485
1486         for (i = 0; i <= vc->vc_npar; i++)
1487                 if (vc->vc_ques) {
1488                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1489                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1490                                 if (on_off)
1491                                         set_kbd(vc, decckm);
1492                                 else
1493                                         clr_kbd(vc, decckm);
1494                                 break;
1495                         case 3: /* 80/132 mode switch unimplemented */
1496 #if 0
1497                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1498                                 /* this alone does not suffice; some user mode
1499                                    utility has to change the hardware regs */
1500 #endif
1501                                 break;
1502                         case 5:                 /* Inverted screen on/off */
1503                                 if (vc->vc_decscnm != on_off) {
1504                                         vc->vc_decscnm = on_off;
1505                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1506                                         update_attr(vc);
1507                                 }
1508                                 break;
1509                         case 6:                 /* Origin relative/absolute */
1510                                 vc->vc_decom = on_off;
1511                                 gotoxay(vc, 0, 0);
1512                                 break;
1513                         case 7:                 /* Autowrap on/off */
1514                                 vc->vc_decawm = on_off;
1515                                 break;
1516                         case 8:                 /* Autorepeat on/off */
1517                                 if (on_off)
1518                                         set_kbd(vc, decarm);
1519                                 else
1520                                         clr_kbd(vc, decarm);
1521                                 break;
1522                         case 9:
1523                                 vc->vc_report_mouse = on_off ? 1 : 0;
1524                                 break;
1525                         case 25:                /* Cursor on/off */
1526                                 vc->vc_deccm = on_off;
1527                                 break;
1528                         case 1000:
1529                                 vc->vc_report_mouse = on_off ? 2 : 0;
1530                                 break;
1531                         }
1532                 } else {
1533                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1534                         case 3:                 /* Monitor (display ctrls) */
1535                                 vc->vc_disp_ctrl = on_off;
1536                                 break;
1537                         case 4:                 /* Insert Mode on/off */
1538                                 vc->vc_decim = on_off;
1539                                 break;
1540                         case 20:                /* Lf, Enter == CrLf/Lf */
1541                                 if (on_off)
1542                                         set_kbd(vc, lnm);
1543                                 else
1544                                         clr_kbd(vc, lnm);
1545                                 break;
1546                         }
1547                 }
1548 }
1549
1550 /* console_lock is held */
1551 static void setterm_command(struct vc_data *vc)
1552 {
1553         switch(vc->vc_par[0]) {
1554                 case 1: /* set color for underline mode */
1555                         if (vc->vc_can_do_color &&
1556                                         vc->vc_par[1] < 16) {
1557                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1558                                 if (vc->vc_underline)
1559                                         update_attr(vc);
1560                         }
1561                         break;
1562                 case 2: /* set color for half intensity mode */
1563                         if (vc->vc_can_do_color &&
1564                                         vc->vc_par[1] < 16) {
1565                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1566                                 if (vc->vc_intensity == 0)
1567                                         update_attr(vc);
1568                         }
1569                         break;
1570                 case 8: /* store colors as defaults */
1571                         vc->vc_def_color = vc->vc_attr;
1572                         if (vc->vc_hi_font_mask == 0x100)
1573                                 vc->vc_def_color >>= 1;
1574                         default_attr(vc);
1575                         update_attr(vc);
1576                         break;
1577                 case 9: /* set blanking interval */
1578                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1579                         poke_blanked_console();
1580                         break;
1581                 case 10: /* set bell frequency in Hz */
1582                         if (vc->vc_npar >= 1)
1583                                 vc->vc_bell_pitch = vc->vc_par[1];
1584                         else
1585                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1586                         break;
1587                 case 11: /* set bell duration in msec */
1588                         if (vc->vc_npar >= 1)
1589                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1590                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1591                         else
1592                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1593                         break;
1594                 case 12: /* bring specified console to the front */
1595                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1596                                 set_console(vc->vc_par[1] - 1);
1597                         break;
1598                 case 13: /* unblank the screen */
1599                         poke_blanked_console();
1600                         break;
1601                 case 14: /* set vesa powerdown interval */
1602                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1603                         break;
1604                 case 15: /* activate the previous console */
1605                         set_console(last_console);
1606                         break;
1607                 case 16: /* set cursor blink duration in msec */
1608                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1609                                         vc->vc_par[1] <= USHRT_MAX)
1610                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1611                         else
1612                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1613                         break;
1614         }
1615 }
1616
1617 /* console_lock is held */
1618 static void csi_at(struct vc_data *vc, unsigned int nr)
1619 {
1620         if (nr > vc->vc_cols - vc->vc_x)
1621                 nr = vc->vc_cols - vc->vc_x;
1622         else if (!nr)
1623                 nr = 1;
1624         insert_char(vc, nr);
1625 }
1626
1627 /* console_lock is held */
1628 static void csi_L(struct vc_data *vc, unsigned int nr)
1629 {
1630         if (nr > vc->vc_rows - vc->vc_y)
1631                 nr = vc->vc_rows - vc->vc_y;
1632         else if (!nr)
1633                 nr = 1;
1634         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1635         vc->vc_need_wrap = 0;
1636 }
1637
1638 /* console_lock is held */
1639 static void csi_P(struct vc_data *vc, unsigned int nr)
1640 {
1641         if (nr > vc->vc_cols - vc->vc_x)
1642                 nr = vc->vc_cols - vc->vc_x;
1643         else if (!nr)
1644                 nr = 1;
1645         delete_char(vc, nr);
1646 }
1647
1648 /* console_lock is held */
1649 static void csi_M(struct vc_data *vc, unsigned int nr)
1650 {
1651         if (nr > vc->vc_rows - vc->vc_y)
1652                 nr = vc->vc_rows - vc->vc_y;
1653         else if (!nr)
1654                 nr=1;
1655         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1656         vc->vc_need_wrap = 0;
1657 }
1658
1659 /* console_lock is held (except via vc_init->reset_terminal */
1660 static void save_cur(struct vc_data *vc)
1661 {
1662         vc->vc_saved_x          = vc->vc_x;
1663         vc->vc_saved_y          = vc->vc_y;
1664         vc->vc_s_intensity      = vc->vc_intensity;
1665         vc->vc_s_italic         = vc->vc_italic;
1666         vc->vc_s_underline      = vc->vc_underline;
1667         vc->vc_s_blink          = vc->vc_blink;
1668         vc->vc_s_reverse        = vc->vc_reverse;
1669         vc->vc_s_charset        = vc->vc_charset;
1670         vc->vc_s_color          = vc->vc_color;
1671         vc->vc_saved_G0         = vc->vc_G0_charset;
1672         vc->vc_saved_G1         = vc->vc_G1_charset;
1673 }
1674
1675 /* console_lock is held */
1676 static void restore_cur(struct vc_data *vc)
1677 {
1678         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1679         vc->vc_intensity        = vc->vc_s_intensity;
1680         vc->vc_italic           = vc->vc_s_italic;
1681         vc->vc_underline        = vc->vc_s_underline;
1682         vc->vc_blink            = vc->vc_s_blink;
1683         vc->vc_reverse          = vc->vc_s_reverse;
1684         vc->vc_charset          = vc->vc_s_charset;
1685         vc->vc_color            = vc->vc_s_color;
1686         vc->vc_G0_charset       = vc->vc_saved_G0;
1687         vc->vc_G1_charset       = vc->vc_saved_G1;
1688         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1689         update_attr(vc);
1690         vc->vc_need_wrap = 0;
1691 }
1692
1693 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1694         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1695         ESpalette, ESosc };
1696
1697 /* console_lock is held (except via vc_init()) */
1698 static void reset_terminal(struct vc_data *vc, int do_clear)
1699 {
1700         vc->vc_top              = 0;
1701         vc->vc_bottom           = vc->vc_rows;
1702         vc->vc_state            = ESnormal;
1703         vc->vc_ques             = 0;
1704         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1705         vc->vc_G0_charset       = LAT1_MAP;
1706         vc->vc_G1_charset       = GRAF_MAP;
1707         vc->vc_charset          = 0;
1708         vc->vc_need_wrap        = 0;
1709         vc->vc_report_mouse     = 0;
1710         vc->vc_utf              = default_utf8;
1711         vc->vc_utf_count        = 0;
1712
1713         vc->vc_disp_ctrl        = 0;
1714         vc->vc_toggle_meta      = 0;
1715
1716         vc->vc_decscnm          = 0;
1717         vc->vc_decom            = 0;
1718         vc->vc_decawm           = 1;
1719         vc->vc_deccm            = global_cursor_default;
1720         vc->vc_decim            = 0;
1721
1722         vt_reset_keyboard(vc->vc_num);
1723
1724         vc->vc_cursor_type = cur_default;
1725         vc->vc_complement_mask = vc->vc_s_complement_mask;
1726
1727         default_attr(vc);
1728         update_attr(vc);
1729
1730         vc->vc_tab_stop[0]      = 0x01010100;
1731         vc->vc_tab_stop[1]      =
1732         vc->vc_tab_stop[2]      =
1733         vc->vc_tab_stop[3]      =
1734         vc->vc_tab_stop[4]      =
1735         vc->vc_tab_stop[5]      =
1736         vc->vc_tab_stop[6]      =
1737         vc->vc_tab_stop[7]      = 0x01010101;
1738
1739         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1740         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1741         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1742
1743         gotoxy(vc, 0, 0);
1744         save_cur(vc);
1745         if (do_clear)
1746             csi_J(vc, 2);
1747 }
1748
1749 /* console_lock is held */
1750 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1751 {
1752         /*
1753          *  Control characters can be used in the _middle_
1754          *  of an escape sequence.
1755          */
1756         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1757                 return;
1758         switch (c) {
1759         case 0:
1760                 return;
1761         case 7:
1762                 if (vc->vc_state == ESosc)
1763                         vc->vc_state = ESnormal;
1764                 else if (vc->vc_bell_duration)
1765                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1766                 return;
1767         case 8:
1768                 bs(vc);
1769                 return;
1770         case 9:
1771                 vc->vc_pos -= (vc->vc_x << 1);
1772                 while (vc->vc_x < vc->vc_cols - 1) {
1773                         vc->vc_x++;
1774                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1775                                 break;
1776                 }
1777                 vc->vc_pos += (vc->vc_x << 1);
1778                 notify_write(vc, '\t');
1779                 return;
1780         case 10: case 11: case 12:
1781                 lf(vc);
1782                 if (!is_kbd(vc, lnm))
1783                         return;
1784         case 13:
1785                 cr(vc);
1786                 return;
1787         case 14:
1788                 vc->vc_charset = 1;
1789                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1790                 vc->vc_disp_ctrl = 1;
1791                 return;
1792         case 15:
1793                 vc->vc_charset = 0;
1794                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1795                 vc->vc_disp_ctrl = 0;
1796                 return;
1797         case 24: case 26:
1798                 vc->vc_state = ESnormal;
1799                 return;
1800         case 27:
1801                 vc->vc_state = ESesc;
1802                 return;
1803         case 127:
1804                 del(vc);
1805                 return;
1806         case 128+27:
1807                 vc->vc_state = ESsquare;
1808                 return;
1809         }
1810         switch(vc->vc_state) {
1811         case ESesc:
1812                 vc->vc_state = ESnormal;
1813                 switch (c) {
1814                 case '[':
1815                         vc->vc_state = ESsquare;
1816                         return;
1817                 case ']':
1818                         vc->vc_state = ESnonstd;
1819                         return;
1820                 case '%':
1821                         vc->vc_state = ESpercent;
1822                         return;
1823                 case 'E':
1824                         cr(vc);
1825                         lf(vc);
1826                         return;
1827                 case 'M':
1828                         ri(vc);
1829                         return;
1830                 case 'D':
1831                         lf(vc);
1832                         return;
1833                 case 'H':
1834                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1835                         return;
1836                 case 'Z':
1837                         respond_ID(tty);
1838                         return;
1839                 case '7':
1840                         save_cur(vc);
1841                         return;
1842                 case '8':
1843                         restore_cur(vc);
1844                         return;
1845                 case '(':
1846                         vc->vc_state = ESsetG0;
1847                         return;
1848                 case ')':
1849                         vc->vc_state = ESsetG1;
1850                         return;
1851                 case '#':
1852                         vc->vc_state = EShash;
1853                         return;
1854                 case 'c':
1855                         reset_terminal(vc, 1);
1856                         return;
1857                 case '>':  /* Numeric keypad */
1858                         clr_kbd(vc, kbdapplic);
1859                         return;
1860                 case '=':  /* Appl. keypad */
1861                         set_kbd(vc, kbdapplic);
1862                         return;
1863                 }
1864                 return;
1865         case ESnonstd:
1866                 if (c=='P') {   /* palette escape sequence */
1867                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1868                                 vc->vc_par[vc->vc_npar] = 0;
1869                         vc->vc_npar = 0;
1870                         vc->vc_state = ESpalette;
1871                         return;
1872                 } else if (c=='R') {   /* reset palette */
1873                         reset_palette(vc);
1874                         vc->vc_state = ESnormal;
1875                 } else if (c>='0' && c<='9')
1876                         vc->vc_state = ESosc;
1877                 else
1878                         vc->vc_state = ESnormal;
1879                 return;
1880         case ESpalette:
1881                 if (isxdigit(c)) {
1882                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1883                         if (vc->vc_npar == 7) {
1884                                 int i = vc->vc_par[0] * 3, j = 1;
1885                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1886                                 vc->vc_palette[i++] += vc->vc_par[j++];
1887                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1888                                 vc->vc_palette[i++] += vc->vc_par[j++];
1889                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1890                                 vc->vc_palette[i] += vc->vc_par[j];
1891                                 set_palette(vc);
1892                                 vc->vc_state = ESnormal;
1893                         }
1894                 } else
1895                         vc->vc_state = ESnormal;
1896                 return;
1897         case ESsquare:
1898                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1899                         vc->vc_par[vc->vc_npar] = 0;
1900                 vc->vc_npar = 0;
1901                 vc->vc_state = ESgetpars;
1902                 if (c == '[') { /* Function key */
1903                         vc->vc_state=ESfunckey;
1904                         return;
1905                 }
1906                 vc->vc_ques = (c == '?');
1907                 if (vc->vc_ques)
1908                         return;
1909         case ESgetpars:
1910                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1911                         vc->vc_npar++;
1912                         return;
1913                 } else if (c>='0' && c<='9') {
1914                         vc->vc_par[vc->vc_npar] *= 10;
1915                         vc->vc_par[vc->vc_npar] += c - '0';
1916                         return;
1917                 }
1918                 vc->vc_state = ESnormal;
1919                 switch(c) {
1920                 case 'h':
1921                         set_mode(vc, 1);
1922                         return;
1923                 case 'l':
1924                         set_mode(vc, 0);
1925                         return;
1926                 case 'c':
1927                         if (vc->vc_ques) {
1928                                 if (vc->vc_par[0])
1929                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1930                                 else
1931                                         vc->vc_cursor_type = cur_default;
1932                                 return;
1933                         }
1934                         break;
1935                 case 'm':
1936                         if (vc->vc_ques) {
1937                                 clear_selection();
1938                                 if (vc->vc_par[0])
1939                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1940                                 else
1941                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1942                                 return;
1943                         }
1944                         break;
1945                 case 'n':
1946                         if (!vc->vc_ques) {
1947                                 if (vc->vc_par[0] == 5)
1948                                         status_report(tty);
1949                                 else if (vc->vc_par[0] == 6)
1950                                         cursor_report(vc, tty);
1951                         }
1952                         return;
1953                 }
1954                 if (vc->vc_ques) {
1955                         vc->vc_ques = 0;
1956                         return;
1957                 }
1958                 switch(c) {
1959                 case 'G': case '`':
1960                         if (vc->vc_par[0])
1961                                 vc->vc_par[0]--;
1962                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1963                         return;
1964                 case 'A':
1965                         if (!vc->vc_par[0])
1966                                 vc->vc_par[0]++;
1967                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1968                         return;
1969                 case 'B': case 'e':
1970                         if (!vc->vc_par[0])
1971                                 vc->vc_par[0]++;
1972                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1973                         return;
1974                 case 'C': case 'a':
1975                         if (!vc->vc_par[0])
1976                                 vc->vc_par[0]++;
1977                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1978                         return;
1979                 case 'D':
1980                         if (!vc->vc_par[0])
1981                                 vc->vc_par[0]++;
1982                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1983                         return;
1984                 case 'E':
1985                         if (!vc->vc_par[0])
1986                                 vc->vc_par[0]++;
1987                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1988                         return;
1989                 case 'F':
1990                         if (!vc->vc_par[0])
1991                                 vc->vc_par[0]++;
1992                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1993                         return;
1994                 case 'd':
1995                         if (vc->vc_par[0])
1996                                 vc->vc_par[0]--;
1997                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1998                         return;
1999                 case 'H': case 'f':
2000                         if (vc->vc_par[0])
2001                                 vc->vc_par[0]--;
2002                         if (vc->vc_par[1])
2003                                 vc->vc_par[1]--;
2004                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2005                         return;
2006                 case 'J':
2007                         csi_J(vc, vc->vc_par[0]);
2008                         return;
2009                 case 'K':
2010                         csi_K(vc, vc->vc_par[0]);
2011                         return;
2012                 case 'L':
2013                         csi_L(vc, vc->vc_par[0]);
2014                         return;
2015                 case 'M':
2016                         csi_M(vc, vc->vc_par[0]);
2017                         return;
2018                 case 'P':
2019                         csi_P(vc, vc->vc_par[0]);
2020                         return;
2021                 case 'c':
2022                         if (!vc->vc_par[0])
2023                                 respond_ID(tty);
2024                         return;
2025                 case 'g':
2026                         if (!vc->vc_par[0])
2027                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2028                         else if (vc->vc_par[0] == 3) {
2029                                 vc->vc_tab_stop[0] =
2030                                         vc->vc_tab_stop[1] =
2031                                         vc->vc_tab_stop[2] =
2032                                         vc->vc_tab_stop[3] =
2033                                         vc->vc_tab_stop[4] =
2034                                         vc->vc_tab_stop[5] =
2035                                         vc->vc_tab_stop[6] =
2036                                         vc->vc_tab_stop[7] = 0;
2037                         }
2038                         return;
2039                 case 'm':
2040                         csi_m(vc);
2041                         return;
2042                 case 'q': /* DECLL - but only 3 leds */
2043                         /* map 0,1,2,3 to 0,1,2,4 */
2044                         if (vc->vc_par[0] < 4)
2045                                 vt_set_led_state(vc->vc_num,
2046                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2047                         return;
2048                 case 'r':
2049                         if (!vc->vc_par[0])
2050                                 vc->vc_par[0]++;
2051                         if (!vc->vc_par[1])
2052                                 vc->vc_par[1] = vc->vc_rows;
2053                         /* Minimum allowed region is 2 lines */
2054                         if (vc->vc_par[0] < vc->vc_par[1] &&
2055                             vc->vc_par[1] <= vc->vc_rows) {
2056                                 vc->vc_top = vc->vc_par[0] - 1;
2057                                 vc->vc_bottom = vc->vc_par[1];
2058                                 gotoxay(vc, 0, 0);
2059                         }
2060                         return;
2061                 case 's':
2062                         save_cur(vc);
2063                         return;
2064                 case 'u':
2065                         restore_cur(vc);
2066                         return;
2067                 case 'X':
2068                         csi_X(vc, vc->vc_par[0]);
2069                         return;
2070                 case '@':
2071                         csi_at(vc, vc->vc_par[0]);
2072                         return;
2073                 case ']': /* setterm functions */
2074                         setterm_command(vc);
2075                         return;
2076                 }
2077                 return;
2078         case ESpercent:
2079                 vc->vc_state = ESnormal;
2080                 switch (c) {
2081                 case '@':  /* defined in ISO 2022 */
2082                         vc->vc_utf = 0;
2083                         return;
2084                 case 'G':  /* prelim official escape code */
2085                 case '8':  /* retained for compatibility */
2086                         vc->vc_utf = 1;
2087                         return;
2088                 }
2089                 return;
2090         case ESfunckey:
2091                 vc->vc_state = ESnormal;
2092                 return;
2093         case EShash:
2094                 vc->vc_state = ESnormal;
2095                 if (c == '8') {
2096                         /* DEC screen alignment test. kludge :-) */
2097                         vc->vc_video_erase_char =
2098                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2099                         csi_J(vc, 2);
2100                         vc->vc_video_erase_char =
2101                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2102                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2103                 }
2104                 return;
2105         case ESsetG0:
2106                 if (c == '0')
2107                         vc->vc_G0_charset = GRAF_MAP;
2108                 else if (c == 'B')
2109                         vc->vc_G0_charset = LAT1_MAP;
2110                 else if (c == 'U')
2111                         vc->vc_G0_charset = IBMPC_MAP;
2112                 else if (c == 'K')
2113                         vc->vc_G0_charset = USER_MAP;
2114                 if (vc->vc_charset == 0)
2115                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2116                 vc->vc_state = ESnormal;
2117                 return;
2118         case ESsetG1:
2119                 if (c == '0')
2120                         vc->vc_G1_charset = GRAF_MAP;
2121                 else if (c == 'B')
2122                         vc->vc_G1_charset = LAT1_MAP;
2123                 else if (c == 'U')
2124                         vc->vc_G1_charset = IBMPC_MAP;
2125                 else if (c == 'K')
2126                         vc->vc_G1_charset = USER_MAP;
2127                 if (vc->vc_charset == 1)
2128                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2129                 vc->vc_state = ESnormal;
2130                 return;
2131         case ESosc:
2132                 return;
2133         default:
2134                 vc->vc_state = ESnormal;
2135         }
2136 }
2137
2138 /* is_double_width() is based on the wcwidth() implementation by
2139  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2140  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2141  */
2142 struct interval {
2143         uint32_t first;
2144         uint32_t last;
2145 };
2146
2147 static int ucs_cmp(const void *key, const void *elt)
2148 {
2149         uint32_t ucs = *(uint32_t *)key;
2150         struct interval e = *(struct interval *) elt;
2151
2152         if (ucs > e.last)
2153                 return 1;
2154         else if (ucs < e.first)
2155                 return -1;
2156         return 0;
2157 }
2158
2159 static int is_double_width(uint32_t ucs)
2160 {
2161         static const struct interval double_width[] = {
2162                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2163                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2164                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2165                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2166         };
2167         if (ucs < double_width[0].first ||
2168             ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2169                 return 0;
2170
2171         return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2172                         sizeof(struct interval), ucs_cmp) != NULL;
2173 }
2174
2175 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2176                 unsigned long draw_to, int *draw_x)
2177 {
2178         if (*draw_x < 0)
2179                 return;
2180
2181         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2182                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2183         *draw_x = -1;
2184 }
2185
2186 /* acquires console_lock */
2187 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2188 {
2189         int c, tc, ok, n = 0, draw_x = -1;
2190         unsigned int currcons;
2191         unsigned long draw_from = 0, draw_to = 0;
2192         struct vc_data *vc;
2193         unsigned char vc_attr;
2194         struct vt_notifier_param param;
2195         uint8_t rescan;
2196         uint8_t inverse;
2197         uint8_t width;
2198         u16 himask, charmask;
2199
2200         if (in_interrupt())
2201                 return count;
2202
2203         might_sleep();
2204
2205         console_lock();
2206         vc = tty->driver_data;
2207         if (vc == NULL) {
2208                 pr_err("vt: argh, driver_data is NULL !\n");
2209                 console_unlock();
2210                 return 0;
2211         }
2212
2213         currcons = vc->vc_num;
2214         if (!vc_cons_allocated(currcons)) {
2215                 /* could this happen? */
2216                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2217                 console_unlock();
2218                 return 0;
2219         }
2220
2221         himask = vc->vc_hi_font_mask;
2222         charmask = himask ? 0x1ff : 0xff;
2223
2224         /* undraw cursor first */
2225         if (con_is_fg(vc))
2226                 hide_cursor(vc);
2227
2228         param.vc = vc;
2229
2230         while (!tty->stopped && count) {
2231                 int orig = *buf;
2232                 c = orig;
2233                 buf++;
2234                 n++;
2235                 count--;
2236                 rescan = 0;
2237                 inverse = 0;
2238                 width = 1;
2239
2240                 /* Do no translation at all in control states */
2241                 if (vc->vc_state != ESnormal) {
2242                         tc = c;
2243                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2244                     /* Combine UTF-8 into Unicode in vc_utf_char.
2245                      * vc_utf_count is the number of continuation bytes still
2246                      * expected to arrive.
2247                      * vc_npar is the number of continuation bytes arrived so
2248                      * far
2249                      */
2250 rescan_last_byte:
2251                     if ((c & 0xc0) == 0x80) {
2252                         /* Continuation byte received */
2253                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2254                         if (vc->vc_utf_count) {
2255                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2256                             vc->vc_npar++;
2257                             if (--vc->vc_utf_count) {
2258                                 /* Still need some bytes */
2259                                 continue;
2260                             }
2261                             /* Got a whole character */
2262                             c = vc->vc_utf_char;
2263                             /* Reject overlong sequences */
2264                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2265                                         c > utf8_length_changes[vc->vc_npar])
2266                                 c = 0xfffd;
2267                         } else {
2268                             /* Unexpected continuation byte */
2269                             vc->vc_utf_count = 0;
2270                             c = 0xfffd;
2271                         }
2272                     } else {
2273                         /* Single ASCII byte or first byte of a sequence received */
2274                         if (vc->vc_utf_count) {
2275                             /* Continuation byte expected */
2276                             rescan = 1;
2277                             vc->vc_utf_count = 0;
2278                             c = 0xfffd;
2279                         } else if (c > 0x7f) {
2280                             /* First byte of a multibyte sequence received */
2281                             vc->vc_npar = 0;
2282                             if ((c & 0xe0) == 0xc0) {
2283                                 vc->vc_utf_count = 1;
2284                                 vc->vc_utf_char = (c & 0x1f);
2285                             } else if ((c & 0xf0) == 0xe0) {
2286                                 vc->vc_utf_count = 2;
2287                                 vc->vc_utf_char = (c & 0x0f);
2288                             } else if ((c & 0xf8) == 0xf0) {
2289                                 vc->vc_utf_count = 3;
2290                                 vc->vc_utf_char = (c & 0x07);
2291                             } else if ((c & 0xfc) == 0xf8) {
2292                                 vc->vc_utf_count = 4;
2293                                 vc->vc_utf_char = (c & 0x03);
2294                             } else if ((c & 0xfe) == 0xfc) {
2295                                 vc->vc_utf_count = 5;
2296                                 vc->vc_utf_char = (c & 0x01);
2297                             } else {
2298                                 /* 254 and 255 are invalid */
2299                                 c = 0xfffd;
2300                             }
2301                             if (vc->vc_utf_count) {
2302                                 /* Still need some bytes */
2303                                 continue;
2304                             }
2305                         }
2306                         /* Nothing to do if an ASCII byte was received */
2307                     }
2308                     /* End of UTF-8 decoding. */
2309                     /* c is the received character, or U+FFFD for invalid sequences. */
2310                     /* Replace invalid Unicode code points with U+FFFD too */
2311                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2312                         c = 0xfffd;
2313                     tc = c;
2314                 } else {        /* no utf or alternate charset mode */
2315                     tc = vc_translate(vc, c);
2316                 }
2317
2318                 param.c = tc;
2319                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2320                                         &param) == NOTIFY_STOP)
2321                         continue;
2322
2323                 /* If the original code was a control character we
2324                  * only allow a glyph to be displayed if the code is
2325                  * not normally used (such as for cursor movement) or
2326                  * if the disp_ctrl mode has been explicitly enabled.
2327                  * Certain characters (as given by the CTRL_ALWAYS
2328                  * bitmap) are always displayed as control characters,
2329                  * as the console would be pretty useless without
2330                  * them; to display an arbitrary font position use the
2331                  * direct-to-font zone in UTF-8 mode.
2332                  */
2333                 ok = tc && (c >= 32 ||
2334                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2335                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2336                         && (c != 127 || vc->vc_disp_ctrl)
2337                         && (c != 128+27);
2338
2339                 if (vc->vc_state == ESnormal && ok) {
2340                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2341                                 if (is_double_width(c))
2342                                         width = 2;
2343                         }
2344                         /* Now try to find out how to display it */
2345                         tc = conv_uni_to_pc(vc, tc);
2346                         if (tc & ~charmask) {
2347                                 if (tc == -1 || tc == -2) {
2348                                     continue; /* nothing to display */
2349                                 }
2350                                 /* Glyph not found */
2351                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2352                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2353                                        This would make absolutely no sense with Unicode in mind,
2354                                        but do this for ASCII characters since a font may lack
2355                                        Unicode mapping info and we don't want to end up with
2356                                        having question marks only. */
2357                                     tc = c;
2358                                 } else {
2359                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2360                                     tc = conv_uni_to_pc(vc, 0xfffd);
2361                                     if (tc < 0) {
2362                                         inverse = 1;
2363                                         tc = conv_uni_to_pc(vc, '?');
2364                                         if (tc < 0) tc = '?';
2365                                     }
2366                                 }
2367                         }
2368
2369                         if (!inverse) {
2370                                 vc_attr = vc->vc_attr;
2371                         } else {
2372                                 /* invert vc_attr */
2373                                 if (!vc->vc_can_do_color) {
2374                                         vc_attr = (vc->vc_attr) ^ 0x08;
2375                                 } else if (vc->vc_hi_font_mask == 0x100) {
2376                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2377                                 } else {
2378                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2379                                 }
2380                                 con_flush(vc, draw_from, draw_to, &draw_x);
2381                         }
2382
2383                         while (1) {
2384                                 if (vc->vc_need_wrap || vc->vc_decim)
2385                                         con_flush(vc, draw_from, draw_to,
2386                                                         &draw_x);
2387                                 if (vc->vc_need_wrap) {
2388                                         cr(vc);
2389                                         lf(vc);
2390                                 }
2391                                 if (vc->vc_decim)
2392                                         insert_char(vc, 1);
2393                                 scr_writew(himask ?
2394                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2395                                              (vc_attr << 8) + tc,
2396                                            (u16 *) vc->vc_pos);
2397                                 if (con_should_update(vc) && draw_x < 0) {
2398                                         draw_x = vc->vc_x;
2399                                         draw_from = vc->vc_pos;
2400                                 }
2401                                 if (vc->vc_x == vc->vc_cols - 1) {
2402                                         vc->vc_need_wrap = vc->vc_decawm;
2403                                         draw_to = vc->vc_pos + 2;
2404                                 } else {
2405                                         vc->vc_x++;
2406                                         draw_to = (vc->vc_pos += 2);
2407                                 }
2408
2409                                 if (!--width) break;
2410
2411                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2412                                 if (tc < 0) tc = ' ';
2413                         }
2414                         notify_write(vc, c);
2415
2416                         if (inverse)
2417                                 con_flush(vc, draw_from, draw_to, &draw_x);
2418
2419                         if (rescan) {
2420                                 rescan = 0;
2421                                 inverse = 0;
2422                                 width = 1;
2423                                 c = orig;
2424                                 goto rescan_last_byte;
2425                         }
2426                         continue;
2427                 }
2428                 con_flush(vc, draw_from, draw_to, &draw_x);
2429                 do_con_trol(tty, vc, orig);
2430         }
2431         con_flush(vc, draw_from, draw_to, &draw_x);
2432         console_conditional_schedule();
2433         console_unlock();
2434         notify_update(vc);
2435         return n;
2436 }
2437
2438 /*
2439  * This is the console switching callback.
2440  *
2441  * Doing console switching in a process context allows
2442  * us to do the switches asynchronously (needed when we want
2443  * to switch due to a keyboard interrupt).  Synchronization
2444  * with other console code and prevention of re-entrancy is
2445  * ensured with console_lock.
2446  */
2447 static void console_callback(struct work_struct *ignored)
2448 {
2449         console_lock();
2450
2451         if (want_console >= 0) {
2452                 if (want_console != fg_console &&
2453                     vc_cons_allocated(want_console)) {
2454                         hide_cursor(vc_cons[fg_console].d);
2455                         change_console(vc_cons[want_console].d);
2456                         /* we only changed when the console had already
2457                            been allocated - a new console is not created
2458                            in an interrupt routine */
2459                 }
2460                 want_console = -1;
2461         }
2462         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2463                 do_poke_blanked_console = 0;
2464                 poke_blanked_console();
2465         }
2466         if (scrollback_delta) {
2467                 struct vc_data *vc = vc_cons[fg_console].d;
2468                 clear_selection();
2469                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2470                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2471                 scrollback_delta = 0;
2472         }
2473         if (blank_timer_expired) {
2474                 do_blank_screen(0);
2475                 blank_timer_expired = 0;
2476         }
2477         notify_update(vc_cons[fg_console].d);
2478
2479         console_unlock();
2480 }
2481
2482 int set_console(int nr)
2483 {
2484         struct vc_data *vc = vc_cons[fg_console].d;
2485
2486         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2487                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2488
2489                 /*
2490                  * Console switch will fail in console_callback() or
2491                  * change_console() so there is no point scheduling
2492                  * the callback
2493                  *
2494                  * Existing set_console() users don't check the return
2495                  * value so this shouldn't break anything
2496                  */
2497                 return -EINVAL;
2498         }
2499
2500         want_console = nr;
2501         schedule_console_callback();
2502
2503         return 0;
2504 }
2505
2506 struct tty_driver *console_driver;
2507
2508 #ifdef CONFIG_VT_CONSOLE
2509
2510 /**
2511  * vt_kmsg_redirect() - Sets/gets the kernel message console
2512  * @new:        The new virtual terminal number or -1 if the console should stay
2513  *              unchanged
2514  *
2515  * By default, the kernel messages are always printed on the current virtual
2516  * console. However, the user may modify that default with the
2517  * TIOCL_SETKMSGREDIRECT ioctl call.
2518  *
2519  * This function sets the kernel message console to be @new. It returns the old
2520  * virtual console number. The virtual terminal number 0 (both as parameter and
2521  * return value) means no redirection (i.e. always printed on the currently
2522  * active console).
2523  *
2524  * The parameter -1 means that only the current console is returned, but the
2525  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2526  * case to make the code more understandable.
2527  *
2528  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2529  * the parameter and always returns 0.
2530  */
2531 int vt_kmsg_redirect(int new)
2532 {
2533         static int kmsg_con;
2534
2535         if (new != -1)
2536                 return xchg(&kmsg_con, new);
2537         else
2538                 return kmsg_con;
2539 }
2540
2541 /*
2542  *      Console on virtual terminal
2543  *
2544  * The console must be locked when we get here.
2545  */
2546
2547 static void vt_console_print(struct console *co, const char *b, unsigned count)
2548 {
2549         struct vc_data *vc = vc_cons[fg_console].d;
2550         unsigned char c;
2551         static DEFINE_SPINLOCK(printing_lock);
2552         const ushort *start;
2553         ushort cnt = 0;
2554         ushort myx;
2555         int kmsg_console;
2556
2557         /* console busy or not yet initialized */
2558         if (!printable)
2559                 return;
2560         if (!spin_trylock(&printing_lock))
2561                 return;
2562
2563         kmsg_console = vt_get_kmsg_redirect();
2564         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2565                 vc = vc_cons[kmsg_console - 1].d;
2566
2567         /* read `x' only after setting currcons properly (otherwise
2568            the `x' macro will read the x of the foreground console). */
2569         myx = vc->vc_x;
2570
2571         if (!vc_cons_allocated(fg_console)) {
2572                 /* impossible */
2573                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2574                 goto quit;
2575         }
2576
2577         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2578                 goto quit;
2579
2580         /* undraw cursor first */
2581         if (con_is_fg(vc))
2582                 hide_cursor(vc);
2583
2584         start = (ushort *)vc->vc_pos;
2585
2586         /* Contrived structure to try to emulate original need_wrap behaviour
2587          * Problems caused when we have need_wrap set on '\n' character */
2588         while (count--) {
2589                 c = *b++;
2590                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2591                         if (cnt > 0) {
2592                                 if (con_is_visible(vc))
2593                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2594                                 vc->vc_x += cnt;
2595                                 if (vc->vc_need_wrap)
2596                                         vc->vc_x--;
2597                                 cnt = 0;
2598                         }
2599                         if (c == 8) {           /* backspace */
2600                                 bs(vc);
2601                                 start = (ushort *)vc->vc_pos;
2602                                 myx = vc->vc_x;
2603                                 continue;
2604                         }
2605                         if (c != 13)
2606                                 lf(vc);
2607                         cr(vc);
2608                         start = (ushort *)vc->vc_pos;
2609                         myx = vc->vc_x;
2610                         if (c == 10 || c == 13)
2611                                 continue;
2612                 }
2613                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2614                 notify_write(vc, c);
2615                 cnt++;
2616                 if (myx == vc->vc_cols - 1) {
2617                         vc->vc_need_wrap = 1;
2618                         continue;
2619                 }
2620                 vc->vc_pos += 2;
2621                 myx++;
2622         }
2623         if (cnt > 0) {
2624                 if (con_is_visible(vc))
2625                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2626                 vc->vc_x += cnt;
2627                 if (vc->vc_x == vc->vc_cols) {
2628                         vc->vc_x--;
2629                         vc->vc_need_wrap = 1;
2630                 }
2631         }
2632         set_cursor(vc);
2633         notify_update(vc);
2634
2635 quit:
2636         spin_unlock(&printing_lock);
2637 }
2638
2639 static struct tty_driver *vt_console_device(struct console *c, int *index)
2640 {
2641         *index = c->index ? c->index-1 : fg_console;
2642         return console_driver;
2643 }
2644
2645 static struct console vt_console_driver = {
2646         .name           = "tty",
2647         .write          = vt_console_print,
2648         .device         = vt_console_device,
2649         .unblank        = unblank_screen,
2650         .flags          = CON_PRINTBUFFER,
2651         .index          = -1,
2652 };
2653 #endif
2654
2655 /*
2656  *      Handling of Linux-specific VC ioctls
2657  */
2658
2659 /*
2660  * Generally a bit racy with respect to console_lock();.
2661  *
2662  * There are some functions which don't need it.
2663  *
2664  * There are some functions which can sleep for arbitrary periods
2665  * (paste_selection) but we don't need the lock there anyway.
2666  *
2667  * set_selection has locking, and definitely needs it
2668  */
2669
2670 int tioclinux(struct tty_struct *tty, unsigned long arg)
2671 {
2672         char type, data;
2673         char __user *p = (char __user *)arg;
2674         int lines;
2675         int ret;
2676
2677         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2678                 return -EPERM;
2679         if (get_user(type, p))
2680                 return -EFAULT;
2681         ret = 0;
2682
2683         switch (type)
2684         {
2685                 case TIOCL_SETSEL:
2686                         console_lock();
2687                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2688                         console_unlock();
2689                         break;
2690                 case TIOCL_PASTESEL:
2691                         ret = paste_selection(tty);
2692                         break;
2693                 case TIOCL_UNBLANKSCREEN:
2694                         console_lock();
2695                         unblank_screen();
2696                         console_unlock();
2697                         break;
2698                 case TIOCL_SELLOADLUT:
2699                         console_lock();
2700                         ret = sel_loadlut(p);
2701                         console_unlock();
2702                         break;
2703                 case TIOCL_GETSHIFTSTATE:
2704
2705         /*
2706          * Make it possible to react to Shift+Mousebutton.
2707          * Note that 'shift_state' is an undocumented
2708          * kernel-internal variable; programs not closely
2709          * related to the kernel should not use this.
2710          */
2711                         data = vt_get_shift_state();
2712                         ret = put_user(data, p);
2713                         break;
2714                 case TIOCL_GETMOUSEREPORTING:
2715                         console_lock(); /* May be overkill */
2716                         data = mouse_reporting();
2717                         console_unlock();
2718                         ret = put_user(data, p);
2719                         break;
2720                 case TIOCL_SETVESABLANK:
2721                         console_lock();
2722                         ret = set_vesa_blanking(p);
2723                         console_unlock();
2724                         break;
2725                 case TIOCL_GETKMSGREDIRECT:
2726                         data = vt_get_kmsg_redirect();
2727                         ret = put_user(data, p);
2728                         break;
2729                 case TIOCL_SETKMSGREDIRECT:
2730                         if (!capable(CAP_SYS_ADMIN)) {
2731                                 ret = -EPERM;
2732                         } else {
2733                                 if (get_user(data, p+1))
2734                                         ret = -EFAULT;
2735                                 else
2736                                         vt_kmsg_redirect(data);
2737                         }
2738                         break;
2739                 case TIOCL_GETFGCONSOLE:
2740                         /* No locking needed as this is a transiently
2741                            correct return anyway if the caller hasn't
2742                            disabled switching */
2743                         ret = fg_console;
2744                         break;
2745                 case TIOCL_SCROLLCONSOLE:
2746                         if (get_user(lines, (s32 __user *)(p+4))) {
2747                                 ret = -EFAULT;
2748                         } else {
2749                                 /* Need the console lock here. Note that lots
2750                                    of other calls need fixing before the lock
2751                                    is actually useful ! */
2752                                 console_lock();
2753                                 scrollfront(vc_cons[fg_console].d, lines);
2754                                 console_unlock();
2755                                 ret = 0;
2756                         }
2757                         break;
2758                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2759                         console_lock();
2760                         ignore_poke = 1;
2761                         do_blank_screen(0);
2762                         console_unlock();
2763                         break;
2764                 case TIOCL_BLANKEDSCREEN:
2765                         ret = console_blanked;
2766                         break;
2767                 default:
2768                         ret = -EINVAL;
2769                         break;
2770         }
2771         return ret;
2772 }
2773
2774 /*
2775  * /dev/ttyN handling
2776  */
2777
2778 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2779 {
2780         int     retval;
2781
2782         retval = do_con_write(tty, buf, count);
2783         con_flush_chars(tty);
2784
2785         return retval;
2786 }
2787
2788 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2789 {
2790         if (in_interrupt())
2791                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2792         return do_con_write(tty, &ch, 1);
2793 }
2794
2795 static int con_write_room(struct tty_struct *tty)
2796 {
2797         if (tty->stopped)
2798                 return 0;
2799         return 32768;           /* No limit, really; we're not buffering */
2800 }
2801
2802 static int con_chars_in_buffer(struct tty_struct *tty)
2803 {
2804         return 0;               /* we're not buffering */
2805 }
2806
2807 /*
2808  * con_throttle and con_unthrottle are only used for
2809  * paste_selection(), which has to stuff in a large number of
2810  * characters...
2811  */
2812 static void con_throttle(struct tty_struct *tty)
2813 {
2814 }
2815
2816 static void con_unthrottle(struct tty_struct *tty)
2817 {
2818         struct vc_data *vc = tty->driver_data;
2819
2820         wake_up_interruptible(&vc->paste_wait);
2821 }
2822
2823 /*
2824  * Turn the Scroll-Lock LED on when the tty is stopped
2825  */
2826 static void con_stop(struct tty_struct *tty)
2827 {
2828         int console_num;
2829         if (!tty)
2830                 return;
2831         console_num = tty->index;
2832         if (!vc_cons_allocated(console_num))
2833                 return;
2834         vt_kbd_con_stop(console_num);
2835 }
2836
2837 /*
2838  * Turn the Scroll-Lock LED off when the console is started
2839  */
2840 static void con_start(struct tty_struct *tty)
2841 {
2842         int console_num;
2843         if (!tty)
2844                 return;
2845         console_num = tty->index;
2846         if (!vc_cons_allocated(console_num))
2847                 return;
2848         vt_kbd_con_start(console_num);
2849 }
2850
2851 static void con_flush_chars(struct tty_struct *tty)
2852 {
2853         struct vc_data *vc;
2854
2855         if (in_interrupt())     /* from flush_to_ldisc */
2856                 return;
2857
2858         /* if we race with con_close(), vt may be null */
2859         console_lock();
2860         vc = tty->driver_data;
2861         if (vc)
2862                 set_cursor(vc);
2863         console_unlock();
2864 }
2865
2866 /*
2867  * Allocate the console screen memory.
2868  */
2869 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2870 {
2871         unsigned int currcons = tty->index;
2872         struct vc_data *vc;
2873         int ret;
2874
2875         console_lock();
2876         ret = vc_allocate(currcons);
2877         if (ret)
2878                 goto unlock;
2879
2880         vc = vc_cons[currcons].d;
2881
2882         /* Still being freed */
2883         if (vc->port.tty) {
2884                 ret = -ERESTARTSYS;
2885                 goto unlock;
2886         }
2887
2888         ret = tty_port_install(&vc->port, driver, tty);
2889         if (ret)
2890                 goto unlock;
2891
2892         tty->driver_data = vc;
2893         vc->port.tty = tty;
2894
2895         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2896                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2897                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2898         }
2899         if (vc->vc_utf)
2900                 tty->termios.c_iflag |= IUTF8;
2901         else
2902                 tty->termios.c_iflag &= ~IUTF8;
2903 unlock:
2904         console_unlock();
2905         return ret;
2906 }
2907
2908 static int con_open(struct tty_struct *tty, struct file *filp)
2909 {
2910         /* everything done in install */
2911         return 0;
2912 }
2913
2914
2915 static void con_close(struct tty_struct *tty, struct file *filp)
2916 {
2917         /* Nothing to do - we defer to shutdown */
2918 }
2919
2920 static void con_shutdown(struct tty_struct *tty)
2921 {
2922         struct vc_data *vc = tty->driver_data;
2923         BUG_ON(vc == NULL);
2924         console_lock();
2925         vc->port.tty = NULL;
2926         console_unlock();
2927 }
2928
2929 static int default_color           = 7; /* white */
2930 static int default_italic_color    = 2; // green (ASCII)
2931 static int default_underline_color = 3; // cyan (ASCII)
2932 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2933 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2934 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2935
2936 static void vc_init(struct vc_data *vc, unsigned int rows,
2937                     unsigned int cols, int do_clear)
2938 {
2939         int j, k ;
2940
2941         vc->vc_cols = cols;
2942         vc->vc_rows = rows;
2943         vc->vc_size_row = cols << 1;
2944         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2945
2946         set_origin(vc);
2947         vc->vc_pos = vc->vc_origin;
2948         reset_vc(vc);
2949         for (j=k=0; j<16; j++) {
2950                 vc->vc_palette[k++] = default_red[j] ;
2951                 vc->vc_palette[k++] = default_grn[j] ;
2952                 vc->vc_palette[k++] = default_blu[j] ;
2953         }
2954         vc->vc_def_color       = default_color;
2955         vc->vc_ulcolor         = default_underline_color;
2956         vc->vc_itcolor         = default_italic_color;
2957         vc->vc_halfcolor       = 0x08;   /* grey */
2958         init_waitqueue_head(&vc->paste_wait);
2959         reset_terminal(vc, do_clear);
2960 }
2961
2962 /*
2963  * This routine initializes console interrupts, and does nothing
2964  * else. If you want the screen to clear, call tty_write with
2965  * the appropriate escape-sequence.
2966  */
2967
2968 static int __init con_init(void)
2969 {
2970         const char *display_desc = NULL;
2971         struct vc_data *vc;
2972         unsigned int currcons = 0, i;
2973
2974         console_lock();
2975
2976         if (conswitchp)
2977                 display_desc = conswitchp->con_startup();
2978         if (!display_desc) {
2979                 fg_console = 0;
2980                 console_unlock();
2981                 return 0;
2982         }
2983
2984         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2985                 struct con_driver *con_driver = &registered_con_driver[i];
2986
2987                 if (con_driver->con == NULL) {
2988                         con_driver->con = conswitchp;
2989                         con_driver->desc = display_desc;
2990                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2991                         con_driver->first = 0;
2992                         con_driver->last = MAX_NR_CONSOLES - 1;
2993                         break;
2994                 }
2995         }
2996
2997         for (i = 0; i < MAX_NR_CONSOLES; i++)
2998                 con_driver_map[i] = conswitchp;
2999
3000         if (blankinterval) {
3001                 blank_state = blank_normal_wait;
3002                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3003         }
3004
3005         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3006                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3007                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3008                 tty_port_init(&vc->port);
3009                 visual_init(vc, currcons, 1);
3010                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3011                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3012                         currcons || !vc->vc_sw->con_save_screen);
3013         }
3014         currcons = fg_console = 0;
3015         master_display_fg = vc = vc_cons[currcons].d;
3016         set_origin(vc);
3017         save_screen(vc);
3018         gotoxy(vc, vc->vc_x, vc->vc_y);
3019         csi_J(vc, 0);
3020         update_screen(vc);
3021         pr_info("Console: %s %s %dx%d\n",
3022                 vc->vc_can_do_color ? "colour" : "mono",
3023                 display_desc, vc->vc_cols, vc->vc_rows);
3024         printable = 1;
3025
3026         console_unlock();
3027
3028 #ifdef CONFIG_VT_CONSOLE
3029         register_console(&vt_console_driver);
3030 #endif
3031         return 0;
3032 }
3033 console_initcall(con_init);
3034
3035 static const struct tty_operations con_ops = {
3036         .install = con_install,
3037         .open = con_open,
3038         .close = con_close,
3039         .write = con_write,
3040         .write_room = con_write_room,
3041         .put_char = con_put_char,
3042         .flush_chars = con_flush_chars,
3043         .chars_in_buffer = con_chars_in_buffer,
3044         .ioctl = vt_ioctl,
3045 #ifdef CONFIG_COMPAT
3046         .compat_ioctl = vt_compat_ioctl,
3047 #endif
3048         .stop = con_stop,
3049         .start = con_start,
3050         .throttle = con_throttle,
3051         .unthrottle = con_unthrottle,
3052         .resize = vt_resize,
3053         .shutdown = con_shutdown
3054 };
3055
3056 static struct cdev vc0_cdev;
3057
3058 static ssize_t show_tty_active(struct device *dev,
3059                                 struct device_attribute *attr, char *buf)
3060 {
3061         return sprintf(buf, "tty%d\n", fg_console + 1);
3062 }
3063 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3064
3065 static struct attribute *vt_dev_attrs[] = {
3066         &dev_attr_active.attr,
3067         NULL
3068 };
3069
3070 ATTRIBUTE_GROUPS(vt_dev);
3071
3072 int __init vty_init(const struct file_operations *console_fops)
3073 {
3074         cdev_init(&vc0_cdev, console_fops);
3075         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3076             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3077                 panic("Couldn't register /dev/tty0 driver\n");
3078         tty0dev = device_create_with_groups(tty_class, NULL,
3079                                             MKDEV(TTY_MAJOR, 0), NULL,
3080                                             vt_dev_groups, "tty0");
3081         if (IS_ERR(tty0dev))
3082                 tty0dev = NULL;
3083
3084         vcs_init();
3085
3086         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3087         if (!console_driver)
3088                 panic("Couldn't allocate console driver\n");
3089
3090         console_driver->name = "tty";
3091         console_driver->name_base = 1;
3092         console_driver->major = TTY_MAJOR;
3093         console_driver->minor_start = 1;
3094         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3095         console_driver->init_termios = tty_std_termios;
3096         if (default_utf8)
3097                 console_driver->init_termios.c_iflag |= IUTF8;
3098         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3099         tty_set_operations(console_driver, &con_ops);
3100         if (tty_register_driver(console_driver))
3101                 panic("Couldn't register console driver\n");
3102         kbd_init();
3103         console_map_init();
3104 #ifdef CONFIG_MDA_CONSOLE
3105         mda_console_init();
3106 #endif
3107         return 0;
3108 }
3109
3110 #ifndef VT_SINGLE_DRIVER
3111
3112 static struct class *vtconsole_class;
3113
3114 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3115                            int deflt)
3116 {
3117         struct module *owner = csw->owner;
3118         const char *desc = NULL;
3119         struct con_driver *con_driver;
3120         int i, j = -1, k = -1, retval = -ENODEV;
3121
3122         if (!try_module_get(owner))
3123                 return -ENODEV;
3124
3125         WARN_CONSOLE_UNLOCKED();
3126
3127         /* check if driver is registered */
3128         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3129                 con_driver = &registered_con_driver[i];
3130
3131                 if (con_driver->con == csw) {
3132                         desc = con_driver->desc;
3133                         retval = 0;
3134                         break;
3135                 }
3136         }
3137
3138         if (retval)
3139                 goto err;
3140
3141         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3142                 csw->con_startup();
3143                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3144         }
3145
3146         if (deflt) {
3147                 if (conswitchp)
3148                         module_put(conswitchp->owner);
3149
3150                 __module_get(owner);
3151                 conswitchp = csw;
3152         }
3153
3154         first = max(first, con_driver->first);
3155         last = min(last, con_driver->last);
3156
3157         for (i = first; i <= last; i++) {
3158                 int old_was_color;
3159                 struct vc_data *vc = vc_cons[i].d;
3160
3161                 if (con_driver_map[i])
3162                         module_put(con_driver_map[i]->owner);
3163                 __module_get(owner);
3164                 con_driver_map[i] = csw;
3165
3166                 if (!vc || !vc->vc_sw)
3167                         continue;
3168
3169                 j = i;
3170
3171                 if (con_is_visible(vc)) {
3172                         k = i;
3173                         save_screen(vc);
3174                 }
3175
3176                 old_was_color = vc->vc_can_do_color;
3177                 vc->vc_sw->con_deinit(vc);
3178                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3179                 visual_init(vc, i, 0);
3180                 set_origin(vc);
3181                 update_attr(vc);
3182
3183                 /* If the console changed between mono <-> color, then
3184                  * the attributes in the screenbuf will be wrong.  The
3185                  * following resets all attributes to something sane.
3186                  */
3187                 if (old_was_color != vc->vc_can_do_color)
3188                         clear_buffer_attributes(vc);
3189         }
3190
3191         pr_info("Console: switching ");
3192         if (!deflt)
3193                 pr_cont("consoles %d-%d ", first + 1, last + 1);
3194         if (j >= 0) {
3195                 struct vc_data *vc = vc_cons[j].d;
3196
3197                 pr_cont("to %s %s %dx%d\n",
3198                         vc->vc_can_do_color ? "colour" : "mono",
3199                         desc, vc->vc_cols, vc->vc_rows);
3200
3201                 if (k >= 0) {
3202                         vc = vc_cons[k].d;
3203                         update_screen(vc);
3204                 }
3205         } else {
3206                 pr_cont("to %s\n", desc);
3207         }
3208
3209         retval = 0;
3210 err:
3211         module_put(owner);
3212         return retval;
3213 };
3214
3215
3216 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3217 /* unlocked version of unbind_con_driver() */
3218 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3219 {
3220         struct module *owner = csw->owner;
3221         const struct consw *defcsw = NULL;
3222         struct con_driver *con_driver = NULL, *con_back = NULL;
3223         int i, retval = -ENODEV;
3224
3225         if (!try_module_get(owner))
3226                 return -ENODEV;
3227
3228         WARN_CONSOLE_UNLOCKED();
3229
3230         /* check if driver is registered and if it is unbindable */
3231         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3232                 con_driver = &registered_con_driver[i];
3233
3234                 if (con_driver->con == csw &&
3235                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3236                         retval = 0;
3237                         break;
3238                 }
3239         }
3240
3241         if (retval)
3242                 goto err;
3243
3244         retval = -ENODEV;
3245
3246         /* check if backup driver exists */
3247         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3248                 con_back = &registered_con_driver[i];
3249
3250                 if (con_back->con && con_back->con != csw) {
3251                         defcsw = con_back->con;
3252                         retval = 0;
3253                         break;
3254                 }
3255         }
3256
3257         if (retval)
3258                 goto err;
3259
3260         if (!con_is_bound(csw))
3261                 goto err;
3262
3263         first = max(first, con_driver->first);
3264         last = min(last, con_driver->last);
3265
3266         for (i = first; i <= last; i++) {
3267                 if (con_driver_map[i] == csw) {
3268                         module_put(csw->owner);
3269                         con_driver_map[i] = NULL;
3270                 }
3271         }
3272
3273         if (!con_is_bound(defcsw)) {
3274                 const struct consw *defconsw = conswitchp;
3275
3276                 defcsw->con_startup();
3277                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3278                 /*
3279                  * vgacon may change the default driver to point
3280                  * to dummycon, we restore it here...
3281                  */
3282                 conswitchp = defconsw;
3283         }
3284
3285         if (!con_is_bound(csw))
3286                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3287
3288         /* ignore return value, binding should not fail */
3289         do_bind_con_driver(defcsw, first, last, deflt);
3290 err:
3291         module_put(owner);
3292         return retval;
3293
3294 }
3295 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3296
3297 static int vt_bind(struct con_driver *con)
3298 {
3299         const struct consw *defcsw = NULL, *csw = NULL;
3300         int i, more = 1, first = -1, last = -1, deflt = 0;
3301
3302         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3303                 goto err;
3304
3305         csw = con->con;
3306
3307         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3308                 struct con_driver *con = &registered_con_driver[i];
3309
3310                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3311                         defcsw = con->con;
3312                         break;
3313                 }
3314         }
3315
3316         if (!defcsw)
3317                 goto err;
3318
3319         while (more) {
3320                 more = 0;
3321
3322                 for (i = con->first; i <= con->last; i++) {
3323                         if (con_driver_map[i] == defcsw) {
3324                                 if (first == -1)
3325                                         first = i;
3326                                 last = i;
3327                                 more = 1;
3328                         } else if (first != -1)
3329                                 break;
3330                 }
3331
3332                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3333                         deflt = 1;
3334
3335                 if (first != -1)
3336                         do_bind_con_driver(csw, first, last, deflt);
3337
3338                 first = -1;
3339                 last = -1;
3340                 deflt = 0;
3341         }
3342
3343 err:
3344         return 0;
3345 }
3346
3347 static int vt_unbind(struct con_driver *con)
3348 {
3349         const struct consw *csw = NULL;
3350         int i, more = 1, first = -1, last = -1, deflt = 0;
3351         int ret;
3352
3353         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3354                 goto err;
3355
3356         csw = con->con;
3357
3358         while (more) {
3359                 more = 0;
3360
3361                 for (i = con->first; i <= con->last; i++) {
3362                         if (con_driver_map[i] == csw) {
3363                                 if (first == -1)
3364                                         first = i;
3365                                 last = i;
3366                                 more = 1;
3367                         } else if (first != -1)
3368                                 break;
3369                 }
3370
3371                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3372                         deflt = 1;
3373
3374                 if (first != -1) {
3375                         ret = do_unbind_con_driver(csw, first, last, deflt);
3376                         if (ret != 0)
3377                                 return ret;
3378                 }
3379
3380                 first = -1;
3381                 last = -1;
3382                 deflt = 0;
3383         }
3384
3385 err:
3386         return 0;
3387 }
3388 #else
3389 static inline int vt_bind(struct con_driver *con)
3390 {
3391         return 0;
3392 }
3393 static inline int vt_unbind(struct con_driver *con)
3394 {
3395         return 0;
3396 }
3397 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3398
3399 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3400                           const char *buf, size_t count)
3401 {
3402         struct con_driver *con = dev_get_drvdata(dev);
3403         int bind = simple_strtoul(buf, NULL, 0);
3404
3405         console_lock();
3406
3407         if (bind)
3408                 vt_bind(con);
3409         else
3410                 vt_unbind(con);
3411
3412         console_unlock();
3413
3414         return count;
3415 }
3416
3417 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3418                          char *buf)
3419 {
3420         struct con_driver *con = dev_get_drvdata(dev);
3421         int bind = con_is_bound(con->con);
3422
3423         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3424 }
3425
3426 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3427                          char *buf)
3428 {
3429         struct con_driver *con = dev_get_drvdata(dev);
3430
3431         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3432                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3433                          con->desc);
3434
3435 }
3436
3437 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3438 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3439
3440 static struct attribute *con_dev_attrs[] = {
3441         &dev_attr_bind.attr,
3442         &dev_attr_name.attr,
3443         NULL
3444 };
3445
3446 ATTRIBUTE_GROUPS(con_dev);
3447
3448 static int vtconsole_init_device(struct con_driver *con)
3449 {
3450         con->flag |= CON_DRIVER_FLAG_ATTR;
3451         return 0;
3452 }
3453
3454 static void vtconsole_deinit_device(struct con_driver *con)
3455 {
3456         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3457 }
3458
3459 /**
3460  * con_is_bound - checks if driver is bound to the console
3461  * @csw: console driver
3462  *
3463  * RETURNS: zero if unbound, nonzero if bound
3464  *
3465  * Drivers can call this and if zero, they should release
3466  * all resources allocated on con_startup()
3467  */
3468 int con_is_bound(const struct consw *csw)
3469 {
3470         int i, bound = 0;
3471
3472         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3473                 if (con_driver_map[i] == csw) {
3474                         bound = 1;
3475                         break;
3476                 }
3477         }
3478
3479         return bound;
3480 }
3481 EXPORT_SYMBOL(con_is_bound);
3482
3483 /**
3484  * con_debug_enter - prepare the console for the kernel debugger
3485  * @sw: console driver
3486  *
3487  * Called when the console is taken over by the kernel debugger, this
3488  * function needs to save the current console state, then put the console
3489  * into a state suitable for the kernel debugger.
3490  *
3491  * RETURNS:
3492  * Zero on success, nonzero if a failure occurred when trying to prepare
3493  * the console for the debugger.
3494  */
3495 int con_debug_enter(struct vc_data *vc)
3496 {
3497         int ret = 0;
3498
3499         saved_fg_console = fg_console;
3500         saved_last_console = last_console;
3501         saved_want_console = want_console;
3502         saved_vc_mode = vc->vc_mode;
3503         saved_console_blanked = console_blanked;
3504         vc->vc_mode = KD_TEXT;
3505         console_blanked = 0;
3506         if (vc->vc_sw->con_debug_enter)
3507                 ret = vc->vc_sw->con_debug_enter(vc);
3508 #ifdef CONFIG_KGDB_KDB
3509         /* Set the initial LINES variable if it is not already set */
3510         if (vc->vc_rows < 999) {
3511                 int linecount;
3512                 char lns[4];
3513                 const char *setargs[3] = {
3514                         "set",
3515                         "LINES",
3516                         lns,
3517                 };
3518                 if (kdbgetintenv(setargs[0], &linecount)) {
3519                         snprintf(lns, 4, "%i", vc->vc_rows);
3520                         kdb_set(2, setargs);
3521                 }
3522         }
3523         if (vc->vc_cols < 999) {
3524                 int colcount;
3525                 char cols[4];
3526                 const char *setargs[3] = {
3527                         "set",
3528                         "COLUMNS",
3529                         cols,
3530                 };
3531                 if (kdbgetintenv(setargs[0], &colcount)) {
3532                         snprintf(cols, 4, "%i", vc->vc_cols);
3533                         kdb_set(2, setargs);
3534                 }
3535         }
3536 #endif /* CONFIG_KGDB_KDB */
3537         return ret;
3538 }
3539 EXPORT_SYMBOL_GPL(con_debug_enter);
3540
3541 /**
3542  * con_debug_leave - restore console state
3543  * @sw: console driver
3544  *
3545  * Restore the console state to what it was before the kernel debugger
3546  * was invoked.
3547  *
3548  * RETURNS:
3549  * Zero on success, nonzero if a failure occurred when trying to restore
3550  * the console.
3551  */
3552 int con_debug_leave(void)
3553 {
3554         struct vc_data *vc;
3555         int ret = 0;
3556
3557         fg_console = saved_fg_console;
3558         last_console = saved_last_console;
3559         want_console = saved_want_console;
3560         console_blanked = saved_console_blanked;
3561         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3562
3563         vc = vc_cons[fg_console].d;
3564         if (vc->vc_sw->con_debug_leave)
3565                 ret = vc->vc_sw->con_debug_leave(vc);
3566         return ret;
3567 }
3568 EXPORT_SYMBOL_GPL(con_debug_leave);
3569
3570 static int do_register_con_driver(const struct consw *csw, int first, int last)
3571 {
3572         struct module *owner = csw->owner;
3573         struct con_driver *con_driver;
3574         const char *desc;
3575         int i, retval;
3576
3577         WARN_CONSOLE_UNLOCKED();
3578
3579         if (!try_module_get(owner))
3580                 return -ENODEV;
3581
3582         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3583                 con_driver = &registered_con_driver[i];
3584
3585                 /* already registered */
3586                 if (con_driver->con == csw) {
3587                         retval = -EBUSY;
3588                         goto err;
3589                 }
3590         }
3591
3592         desc = csw->con_startup();
3593         if (!desc) {
3594                 retval = -ENODEV;
3595                 goto err;
3596         }
3597
3598         retval = -EINVAL;
3599
3600         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3601                 con_driver = &registered_con_driver[i];
3602
3603                 if (con_driver->con == NULL &&
3604                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3605                         con_driver->con = csw;
3606                         con_driver->desc = desc;
3607                         con_driver->node = i;
3608                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3609                                            CON_DRIVER_FLAG_INIT;
3610                         con_driver->first = first;
3611                         con_driver->last = last;
3612                         retval = 0;
3613                         break;
3614                 }
3615         }
3616
3617         if (retval)
3618                 goto err;
3619
3620         con_driver->dev =
3621                 device_create_with_groups(vtconsole_class, NULL,
3622                                           MKDEV(0, con_driver->node),
3623                                           con_driver, con_dev_groups,
3624                                           "vtcon%i", con_driver->node);
3625         if (IS_ERR(con_driver->dev)) {
3626                 pr_warn("Unable to create device for %s; errno = %ld\n",
3627                         con_driver->desc, PTR_ERR(con_driver->dev));
3628                 con_driver->dev = NULL;
3629         } else {
3630                 vtconsole_init_device(con_driver);
3631         }
3632
3633 err:
3634         module_put(owner);
3635         return retval;
3636 }
3637
3638
3639 /**
3640  * do_unregister_con_driver - unregister console driver from console layer
3641  * @csw: console driver
3642  *
3643  * DESCRIPTION: All drivers that registers to the console layer must
3644  * call this function upon exit, or if the console driver is in a state
3645  * where it won't be able to handle console services, such as the
3646  * framebuffer console without loaded framebuffer drivers.
3647  *
3648  * The driver must unbind first prior to unregistration.
3649  */
3650 int do_unregister_con_driver(const struct consw *csw)
3651 {
3652         int i;
3653
3654         /* cannot unregister a bound driver */
3655         if (con_is_bound(csw))
3656                 return -EBUSY;
3657
3658         if (csw == conswitchp)
3659                 return -EINVAL;
3660
3661         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3662                 struct con_driver *con_driver = &registered_con_driver[i];
3663
3664                 if (con_driver->con == csw) {
3665                         /*
3666                          * Defer the removal of the sysfs entries since that
3667                          * will acquire the kernfs s_active lock and we can't
3668                          * acquire this lock while holding the console lock:
3669                          * the unbind sysfs entry imposes already the opposite
3670                          * order. Reset con already here to prevent any later
3671                          * lookup to succeed and mark this slot as zombie, so
3672                          * it won't get reused until we complete the removal
3673                          * in the deferred work.
3674                          */
3675                         con_driver->con = NULL;
3676                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3677                         schedule_work(&con_driver_unregister_work);
3678
3679                         return 0;
3680                 }
3681         }
3682
3683         return -ENODEV;
3684 }
3685 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3686
3687 static void con_driver_unregister_callback(struct work_struct *ignored)
3688 {
3689         int i;
3690
3691         console_lock();
3692
3693         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3694                 struct con_driver *con_driver = &registered_con_driver[i];
3695
3696                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3697                         continue;
3698
3699                 console_unlock();
3700
3701                 vtconsole_deinit_device(con_driver);
3702                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3703
3704                 console_lock();
3705
3706                 if (WARN_ON_ONCE(con_driver->con))
3707                         con_driver->con = NULL;
3708                 con_driver->desc = NULL;
3709                 con_driver->dev = NULL;
3710                 con_driver->node = 0;
3711                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3712                 con_driver->flag = 0;
3713                 con_driver->first = 0;
3714                 con_driver->last = 0;
3715         }
3716
3717         console_unlock();
3718 }
3719
3720 /*
3721  *      If we support more console drivers, this function is used
3722  *      when a driver wants to take over some existing consoles
3723  *      and become default driver for newly opened ones.
3724  *
3725  *      do_take_over_console is basically a register followed by unbind
3726  */
3727 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3728 {
3729         int err;
3730
3731         err = do_register_con_driver(csw, first, last);
3732         /*
3733          * If we get an busy error we still want to bind the console driver
3734          * and return success, as we may have unbound the console driver
3735          * but not unregistered it.
3736          */
3737         if (err == -EBUSY)
3738                 err = 0;
3739         if (!err)
3740                 do_bind_con_driver(csw, first, last, deflt);
3741
3742         return err;
3743 }
3744 EXPORT_SYMBOL_GPL(do_take_over_console);
3745
3746
3747 /*
3748  * give_up_console is a wrapper to unregister_con_driver. It will only
3749  * work if driver is fully unbound.
3750  */
3751 void give_up_console(const struct consw *csw)
3752 {
3753         console_lock();
3754         do_unregister_con_driver(csw);
3755         console_unlock();
3756 }
3757
3758 static int __init vtconsole_class_init(void)
3759 {
3760         int i;
3761
3762         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3763         if (IS_ERR(vtconsole_class)) {
3764                 pr_warn("Unable to create vt console class; errno = %ld\n",
3765                         PTR_ERR(vtconsole_class));
3766                 vtconsole_class = NULL;
3767         }
3768
3769         /* Add system drivers to sysfs */
3770         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3771                 struct con_driver *con = &registered_con_driver[i];
3772
3773                 if (con->con && !con->dev) {
3774                         con->dev =
3775                                 device_create_with_groups(vtconsole_class, NULL,
3776                                                           MKDEV(0, con->node),
3777                                                           con, con_dev_groups,
3778                                                           "vtcon%i", con->node);
3779
3780                         if (IS_ERR(con->dev)) {
3781                                 pr_warn("Unable to create device for %s; errno = %ld\n",
3782                                         con->desc, PTR_ERR(con->dev));
3783                                 con->dev = NULL;
3784                         } else {
3785                                 vtconsole_init_device(con);
3786                         }
3787                 }
3788         }
3789
3790         return 0;
3791 }
3792 postcore_initcall(vtconsole_class_init);
3793
3794 #endif
3795
3796 /*
3797  *      Screen blanking
3798  */
3799
3800 static int set_vesa_blanking(char __user *p)
3801 {
3802         unsigned int mode;
3803
3804         if (get_user(mode, p + 1))
3805                 return -EFAULT;
3806
3807         vesa_blank_mode = (mode < 4) ? mode : 0;
3808         return 0;
3809 }
3810
3811 void do_blank_screen(int entering_gfx)
3812 {
3813         struct vc_data *vc = vc_cons[fg_console].d;
3814         int i;
3815
3816         WARN_CONSOLE_UNLOCKED();
3817
3818         if (console_blanked) {
3819                 if (blank_state == blank_vesa_wait) {
3820                         blank_state = blank_off;
3821                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3822                 }
3823                 return;
3824         }
3825
3826         /* entering graphics mode? */
3827         if (entering_gfx) {
3828                 hide_cursor(vc);
3829                 save_screen(vc);
3830                 vc->vc_sw->con_blank(vc, -1, 1);
3831                 console_blanked = fg_console + 1;
3832                 blank_state = blank_off;
3833                 set_origin(vc);
3834                 return;
3835         }
3836
3837         if (blank_state != blank_normal_wait)
3838                 return;
3839         blank_state = blank_off;
3840
3841         /* don't blank graphics */
3842         if (vc->vc_mode != KD_TEXT) {
3843                 console_blanked = fg_console + 1;
3844                 return;
3845         }
3846
3847         hide_cursor(vc);
3848         del_timer_sync(&console_timer);
3849         blank_timer_expired = 0;
3850
3851         save_screen(vc);
3852         /* In case we need to reset origin, blanking hook returns 1 */
3853         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3854         console_blanked = fg_console + 1;
3855         if (i)
3856                 set_origin(vc);
3857
3858         if (console_blank_hook && console_blank_hook(1))
3859                 return;
3860
3861         if (vesa_off_interval && vesa_blank_mode) {
3862                 blank_state = blank_vesa_wait;
3863                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3864         }
3865         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3866 }
3867 EXPORT_SYMBOL(do_blank_screen);
3868
3869 /*
3870  * Called by timer as well as from vt_console_driver
3871  */
3872 void do_unblank_screen(int leaving_gfx)
3873 {
3874         struct vc_data *vc;
3875
3876         /* This should now always be called from a "sane" (read: can schedule)
3877          * context for the sake of the low level drivers, except in the special
3878          * case of oops_in_progress
3879          */
3880         if (!oops_in_progress)
3881                 might_sleep();
3882
3883         WARN_CONSOLE_UNLOCKED();
3884
3885         ignore_poke = 0;
3886         if (!console_blanked)
3887                 return;
3888         if (!vc_cons_allocated(fg_console)) {
3889                 /* impossible */
3890                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3891                         fg_console + 1);
3892                 return;
3893         }
3894         vc = vc_cons[fg_console].d;
3895         /* Try to unblank in oops case too */
3896         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3897                 return; /* but leave console_blanked != 0 */
3898
3899         if (blankinterval) {
3900                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3901                 blank_state = blank_normal_wait;
3902         }
3903
3904         console_blanked = 0;
3905         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3906                 /* Low-level driver cannot restore -> do it ourselves */
3907                 update_screen(vc);
3908         if (console_blank_hook)
3909                 console_blank_hook(0);
3910         set_palette(vc);
3911         set_cursor(vc);
3912         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3913 }
3914 EXPORT_SYMBOL(do_unblank_screen);
3915
3916 /*
3917  * This is called by the outside world to cause a forced unblank, mostly for
3918  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3919  * call it with 1 as an argument and so force a mode restore... that may kill
3920  * X or at least garbage the screen but would also make the Oops visible...
3921  */
3922 void unblank_screen(void)
3923 {
3924         do_unblank_screen(0);
3925 }
3926
3927 /*
3928  * We defer the timer blanking to work queue so it can take the console mutex
3929  * (console operations can still happen at irq time, but only from printk which
3930  * has the console mutex. Not perfect yet, but better than no locking
3931  */
3932 static void blank_screen_t(unsigned long dummy)
3933 {
3934         blank_timer_expired = 1;
3935         schedule_work(&console_work);
3936 }
3937
3938 void poke_blanked_console(void)
3939 {
3940         WARN_CONSOLE_UNLOCKED();
3941
3942         /* Add this so we quickly catch whoever might call us in a non
3943          * safe context. Nowadays, unblank_screen() isn't to be called in
3944          * atomic contexts and is allowed to schedule (with the special case
3945          * of oops_in_progress, but that isn't of any concern for this
3946          * function. --BenH.
3947          */
3948         might_sleep();
3949
3950         /* This isn't perfectly race free, but a race here would be mostly harmless,
3951          * at worse, we'll do a spurrious blank and it's unlikely
3952          */
3953         del_timer(&console_timer);
3954         blank_timer_expired = 0;
3955
3956         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3957                 return;
3958         if (console_blanked)
3959                 unblank_screen();
3960         else if (blankinterval) {
3961                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3962                 blank_state = blank_normal_wait;
3963         }
3964 }
3965
3966 /*
3967  *      Palettes
3968  */
3969
3970 static void set_palette(struct vc_data *vc)
3971 {
3972         WARN_CONSOLE_UNLOCKED();
3973
3974         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3975                 vc->vc_sw->con_set_palette(vc, color_table);
3976 }
3977
3978 /*
3979  * Load palette into the DAC registers. arg points to a colour
3980  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3981  */
3982
3983 int con_set_cmap(unsigned char __user *arg)
3984 {
3985         int i, j, k;
3986         unsigned char colormap[3*16];
3987
3988         if (copy_from_user(colormap, arg, sizeof(colormap)))
3989                 return -EFAULT;
3990
3991         console_lock();
3992         for (i = k = 0; i < 16; i++) {
3993                 default_red[i] = colormap[k++];
3994                 default_grn[i] = colormap[k++];
3995                 default_blu[i] = colormap[k++];
3996         }
3997         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3998                 if (!vc_cons_allocated(i))
3999                         continue;
4000                 for (j = k = 0; j < 16; j++) {
4001                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4002                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4003                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4004                 }
4005                 set_palette(vc_cons[i].d);
4006         }
4007         console_unlock();
4008
4009         return 0;
4010 }
4011
4012 int con_get_cmap(unsigned char __user *arg)
4013 {
4014         int i, k;
4015         unsigned char colormap[3*16];
4016
4017         console_lock();
4018         for (i = k = 0; i < 16; i++) {
4019                 colormap[k++] = default_red[i];
4020                 colormap[k++] = default_grn[i];
4021                 colormap[k++] = default_blu[i];
4022         }
4023         console_unlock();
4024
4025         if (copy_to_user(arg, colormap, sizeof(colormap)))
4026                 return -EFAULT;
4027
4028         return 0;
4029 }
4030
4031 void reset_palette(struct vc_data *vc)
4032 {
4033         int j, k;
4034         for (j=k=0; j<16; j++) {
4035                 vc->vc_palette[k++] = default_red[j];
4036                 vc->vc_palette[k++] = default_grn[j];
4037                 vc->vc_palette[k++] = default_blu[j];
4038         }
4039         set_palette(vc);
4040 }
4041
4042 /*
4043  *  Font switching
4044  *
4045  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4046  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4047  *  depending on width) reserved for each character which is kinda wasty, but
4048  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4049  *  is up to the actual low-level console-driver convert data into its favorite
4050  *  format (maybe we should add a `fontoffset' field to the `display'
4051  *  structure so we won't have to convert the fontdata all the time.
4052  *  /Jes
4053  */
4054
4055 #define max_font_size 65536
4056
4057 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4058 {
4059         struct console_font font;
4060         int rc = -EINVAL;
4061         int c;
4062
4063         if (op->data) {
4064                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4065                 if (!font.data)
4066                         return -ENOMEM;
4067         } else
4068                 font.data = NULL;
4069
4070         console_lock();
4071         if (vc->vc_mode != KD_TEXT)
4072                 rc = -EINVAL;
4073         else if (vc->vc_sw->con_font_get)
4074                 rc = vc->vc_sw->con_font_get(vc, &font);
4075         else
4076                 rc = -ENOSYS;
4077         console_unlock();
4078
4079         if (rc)
4080                 goto out;
4081
4082         c = (font.width+7)/8 * 32 * font.charcount;
4083
4084         if (op->data && font.charcount > op->charcount)
4085                 rc = -ENOSPC;
4086         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4087                 if (font.width > op->width || font.height > op->height)
4088                         rc = -ENOSPC;
4089         } else {
4090                 if (font.width != 8)
4091                         rc = -EIO;
4092                 else if ((op->height && font.height > op->height) ||
4093                          font.height > 32)
4094                         rc = -ENOSPC;
4095         }
4096         if (rc)
4097                 goto out;
4098
4099         op->height = font.height;
4100         op->width = font.width;
4101         op->charcount = font.charcount;
4102
4103         if (op->data && copy_to_user(op->data, font.data, c))
4104                 rc = -EFAULT;
4105
4106 out:
4107         kfree(font.data);
4108         return rc;
4109 }
4110
4111 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4112 {
4113         struct console_font font;
4114         int rc = -EINVAL;
4115         int size;
4116
4117         if (vc->vc_mode != KD_TEXT)
4118                 return -EINVAL;
4119         if (!op->data)
4120                 return -EINVAL;
4121         if (op->charcount > 512)
4122                 return -EINVAL;
4123         if (op->width <= 0 || op->width > 32 || op->height > 32)
4124                 return -EINVAL;
4125         size = (op->width+7)/8 * 32 * op->charcount;
4126         if (size > max_font_size)
4127                 return -ENOSPC;
4128
4129         font.data = memdup_user(op->data, size);
4130         if (IS_ERR(font.data))
4131                 return PTR_ERR(font.data);
4132
4133         if (!op->height) {              /* Need to guess font height [compat] */
4134                 int h, i;
4135                 u8 *charmap = font.data;
4136
4137                 /*
4138                  * If from KDFONTOP ioctl, don't allow things which can be done
4139                  * in userland,so that we can get rid of this soon
4140                  */
4141                 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4142                         kfree(font.data);
4143                         return -EINVAL;
4144                 }
4145
4146                 for (h = 32; h > 0; h--)
4147                         for (i = 0; i < op->charcount; i++)
4148                                 if (charmap[32*i+h-1])
4149                                         goto nonzero;
4150
4151                 kfree(font.data);
4152                 return -EINVAL;
4153
4154         nonzero:
4155                 op->height = h;
4156         }
4157
4158         font.charcount = op->charcount;
4159         font.width = op->width;
4160         font.height = op->height;
4161
4162         console_lock();
4163         if (vc->vc_mode != KD_TEXT)
4164                 rc = -EINVAL;
4165         else if (vc->vc_sw->con_font_set)
4166                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4167         else
4168                 rc = -ENOSYS;
4169         console_unlock();
4170         kfree(font.data);
4171         return rc;
4172 }
4173
4174 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4175 {
4176         struct console_font font = {.width = op->width, .height = op->height};
4177         char name[MAX_FONT_NAME];
4178         char *s = name;
4179         int rc;
4180
4181
4182         if (!op->data)
4183                 s = NULL;
4184         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4185                 return -EFAULT;
4186         else
4187                 name[MAX_FONT_NAME - 1] = 0;
4188
4189         console_lock();
4190         if (vc->vc_mode != KD_TEXT) {
4191                 console_unlock();
4192                 return -EINVAL;
4193         }
4194         if (vc->vc_sw->con_font_default)
4195                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4196         else
4197                 rc = -ENOSYS;
4198         console_unlock();
4199         if (!rc) {
4200                 op->width = font.width;
4201                 op->height = font.height;
4202         }
4203         return rc;
4204 }
4205
4206 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4207 {
4208         int con = op->height;
4209         int rc;
4210
4211
4212         console_lock();
4213         if (vc->vc_mode != KD_TEXT)
4214                 rc = -EINVAL;
4215         else if (!vc->vc_sw->con_font_copy)
4216                 rc = -ENOSYS;
4217         else if (con < 0 || !vc_cons_allocated(con))
4218                 rc = -ENOTTY;
4219         else if (con == vc->vc_num)     /* nothing to do */
4220                 rc = 0;
4221         else
4222                 rc = vc->vc_sw->con_font_copy(vc, con);
4223         console_unlock();
4224         return rc;
4225 }
4226
4227 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4228 {
4229         switch (op->op) {
4230         case KD_FONT_OP_SET:
4231                 return con_font_set(vc, op);
4232         case KD_FONT_OP_GET:
4233                 return con_font_get(vc, op);
4234         case KD_FONT_OP_SET_DEFAULT:
4235                 return con_font_default(vc, op);
4236         case KD_FONT_OP_COPY:
4237                 return con_font_copy(vc, op);
4238         }
4239         return -ENOSYS;
4240 }
4241
4242 /*
4243  *      Interface exported to selection and vcs.
4244  */
4245
4246 /* used by selection */
4247 u16 screen_glyph(struct vc_data *vc, int offset)
4248 {
4249         u16 w = scr_readw(screenpos(vc, offset, 1));
4250         u16 c = w & 0xff;
4251
4252         if (w & vc->vc_hi_font_mask)
4253                 c |= 0x100;
4254         return c;
4255 }
4256 EXPORT_SYMBOL_GPL(screen_glyph);
4257
4258 /* used by vcs - note the word offset */
4259 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4260 {
4261         return screenpos(vc, 2 * w_offset, viewed);
4262 }
4263 EXPORT_SYMBOL_GPL(screen_pos);
4264
4265 void getconsxy(struct vc_data *vc, unsigned char *p)
4266 {
4267         p[0] = vc->vc_x;
4268         p[1] = vc->vc_y;
4269 }
4270
4271 void putconsxy(struct vc_data *vc, unsigned char *p)
4272 {
4273         hide_cursor(vc);
4274         gotoxy(vc, p[0], p[1]);
4275         set_cursor(vc);
4276 }
4277
4278 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4279 {
4280         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4281                 return softcursor_original;
4282         return scr_readw(org);
4283 }
4284
4285 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4286 {
4287         scr_writew(val, org);
4288         if ((unsigned long)org == vc->vc_pos) {
4289                 softcursor_original = -1;
4290                 add_softcursor(vc);
4291         }
4292 }
4293
4294 void vcs_scr_updated(struct vc_data *vc)
4295 {
4296         notify_update(vc);
4297 }
4298
4299 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4300                 unsigned int rolled_over, void *base, unsigned int size)
4301 {
4302         unsigned long ubase = (unsigned long)base;
4303         ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4304         ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4305         ptrdiff_t origin = (void *)c->vc_origin - base;
4306         int margin = c->vc_size_row * 4;
4307         int from, wrap, from_off, avail;
4308
4309         /* Turn scrollback off */
4310         if (!lines) {
4311                 c->vc_visible_origin = c->vc_origin;
4312                 return;
4313         }
4314
4315         /* Do we have already enough to allow jumping from 0 to the end? */
4316         if (rolled_over > scr_end + margin) {
4317                 from = scr_end;
4318                 wrap = rolled_over + c->vc_size_row;
4319         } else {
4320                 from = 0;
4321                 wrap = size;
4322         }
4323
4324         from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4325         avail = (origin - from + wrap) % wrap;
4326
4327         /* Only a little piece would be left? Show all incl. the piece! */
4328         if (avail < 2 * margin)
4329                 margin = 0;
4330         if (from_off < margin)
4331                 from_off = 0;
4332         if (from_off > avail - margin)
4333                 from_off = avail;
4334
4335         c->vc_visible_origin = ubase + (from + from_off) % wrap;
4336 }
4337 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4338
4339 /*
4340  *      Visible symbols for modules
4341  */
4342
4343 EXPORT_SYMBOL(color_table);
4344 EXPORT_SYMBOL(default_red);
4345 EXPORT_SYMBOL(default_grn);
4346 EXPORT_SYMBOL(default_blu);
4347 EXPORT_SYMBOL(update_region);
4348 EXPORT_SYMBOL(redraw_screen);
4349 EXPORT_SYMBOL(vc_resize);
4350 EXPORT_SYMBOL(fg_console);
4351 EXPORT_SYMBOL(console_blank_hook);
4352 EXPORT_SYMBOL(console_blanked);
4353 EXPORT_SYMBOL(vc_cons);
4354 EXPORT_SYMBOL(global_cursor_default);
4355 #ifndef VT_SINGLE_DRIVER
4356 EXPORT_SYMBOL(give_up_console);
4357 #endif