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(struct timer_list *unused);
 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);
 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 2: /* erase whole display */
1182                 case 3: /* (and scrollback buffer later) */
1183                         count = vc->vc_cols * vc->vc_rows;
1184                         start = (unsigned short *)vc->vc_origin;
1185                         break;
1186                 default:
1187                         return;
1188         }
1189         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1190         if (vpar == 3) {
1191                 set_origin(vc);
1192                 flush_scrollback(vc);
1193                 if (con_is_visible(vc))
1194                         update_screen(vc);
1195         } else if (con_should_update(vc))
1196                 do_update_region(vc, (unsigned long) start, count);
1197         vc->vc_need_wrap = 0;
1198 }
1199
1200 static void csi_K(struct vc_data *vc, int vpar)
1201 {
1202         unsigned int count;
1203         unsigned short * start;
1204
1205         switch (vpar) {
1206                 case 0: /* erase from cursor to end of line */
1207                         count = vc->vc_cols - vc->vc_x;
1208                         start = (unsigned short *)vc->vc_pos;
1209                         break;
1210                 case 1: /* erase from start of line to cursor */
1211                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1212                         count = vc->vc_x + 1;
1213                         break;
1214                 case 2: /* erase whole line */
1215                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216                         count = vc->vc_cols;
1217                         break;
1218                 default:
1219                         return;
1220         }
1221         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1222         vc->vc_need_wrap = 0;
1223         if (con_should_update(vc))
1224                 do_update_region(vc, (unsigned long) start, count);
1225 }
1226
1227 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1228 {                                         /* not vt100? */
1229         int count;
1230
1231         if (!vpar)
1232                 vpar++;
1233         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1234
1235         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1236         if (con_should_update(vc))
1237                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1238         vc->vc_need_wrap = 0;
1239 }
1240
1241 static void default_attr(struct vc_data *vc)
1242 {
1243         vc->vc_intensity = 1;
1244         vc->vc_italic = 0;
1245         vc->vc_underline = 0;
1246         vc->vc_reverse = 0;
1247         vc->vc_blink = 0;
1248         vc->vc_color = vc->vc_def_color;
1249 }
1250
1251 struct rgb { u8 r; u8 g; u8 b; };
1252
1253 static void rgb_from_256(int i, struct rgb *c)
1254 {
1255         if (i < 8) {            /* Standard colours. */
1256                 c->r = i&1 ? 0xaa : 0x00;
1257                 c->g = i&2 ? 0xaa : 0x00;
1258                 c->b = i&4 ? 0xaa : 0x00;
1259         } else if (i < 16) {
1260                 c->r = i&1 ? 0xff : 0x55;
1261                 c->g = i&2 ? 0xff : 0x55;
1262                 c->b = i&4 ? 0xff : 0x55;
1263         } else if (i < 232) {   /* 6x6x6 colour cube. */
1264                 c->r = (i - 16) / 36 * 85 / 2;
1265                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1266                 c->b = (i - 16) % 6 * 85 / 2;
1267         } else                  /* Grayscale ramp. */
1268                 c->r = c->g = c->b = i * 10 - 2312;
1269 }
1270
1271 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1272 {
1273         u8 hue = 0, max = max3(c->r, c->g, c->b);
1274
1275         if (c->r > max / 2)
1276                 hue |= 4;
1277         if (c->g > max / 2)
1278                 hue |= 2;
1279         if (c->b > max / 2)
1280                 hue |= 1;
1281
1282         if (hue == 7 && max <= 0x55) {
1283                 hue = 0;
1284                 vc->vc_intensity = 2;
1285         } else if (max > 0xaa)
1286                 vc->vc_intensity = 2;
1287         else
1288                 vc->vc_intensity = 1;
1289
1290         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1291 }
1292
1293 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1294 {
1295         /* For backgrounds, err on the dark side. */
1296         vc->vc_color = (vc->vc_color & 0x0f)
1297                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1298 }
1299
1300 /*
1301  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1302  * and thus need to be detected and ignored by hand. Strictly speaking, that
1303  * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1304  * no one produces such codes and almost no one accepts them.
1305  *
1306  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1307  * supporting them.
1308  */
1309 static int vc_t416_color(struct vc_data *vc, int i,
1310                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1311 {
1312         struct rgb c;
1313
1314         i++;
1315         if (i > vc->vc_npar)
1316                 return i;
1317
1318         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1319                 /* 256 colours */
1320                 i++;
1321                 rgb_from_256(vc->vc_par[i], &c);
1322         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1323                 /* 24 bit */
1324                 c.r = vc->vc_par[i + 1];
1325                 c.g = vc->vc_par[i + 2];
1326                 c.b = vc->vc_par[i + 3];
1327                 i += 3;
1328         } else
1329                 return i;
1330
1331         set_color(vc, &c);
1332
1333         return i;
1334 }
1335
1336 /* console_lock is held */
1337 static void csi_m(struct vc_data *vc)
1338 {
1339         int i;
1340
1341         for (i = 0; i <= vc->vc_npar; i++)
1342                 switch (vc->vc_par[i]) {
1343                 case 0: /* all attributes off */
1344                         default_attr(vc);
1345                         break;
1346                 case 1:
1347                         vc->vc_intensity = 2;
1348                         break;
1349                 case 2:
1350                         vc->vc_intensity = 0;
1351                         break;
1352                 case 3:
1353                         vc->vc_italic = 1;
1354                         break;
1355                 case 21:
1356                         /*
1357                          * No console drivers support double underline, so
1358                          * convert it to a single underline.
1359                          */
1360                 case 4:
1361                         vc->vc_underline = 1;
1362                         break;
1363                 case 5:
1364                         vc->vc_blink = 1;
1365                         break;
1366                 case 7:
1367                         vc->vc_reverse = 1;
1368                         break;
1369                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1370                           * Select primary font, don't display control chars if
1371                           * defined, don't set bit 8 on output.
1372                           */
1373                         vc->vc_translate = set_translate(vc->vc_charset == 0
1374                                         ? vc->vc_G0_charset
1375                                         : vc->vc_G1_charset, vc);
1376                         vc->vc_disp_ctrl = 0;
1377                         vc->vc_toggle_meta = 0;
1378                         break;
1379                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1380                           * Select first alternate font, lets chars < 32 be
1381                           * displayed as ROM chars.
1382                           */
1383                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1384                         vc->vc_disp_ctrl = 1;
1385                         vc->vc_toggle_meta = 0;
1386                         break;
1387                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1388                           * Select second alternate font, toggle high bit
1389                           * before displaying as ROM char.
1390                           */
1391                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1392                         vc->vc_disp_ctrl = 1;
1393                         vc->vc_toggle_meta = 1;
1394                         break;
1395                 case 22:
1396                         vc->vc_intensity = 1;
1397                         break;
1398                 case 23:
1399                         vc->vc_italic = 0;
1400                         break;
1401                 case 24:
1402                         vc->vc_underline = 0;
1403                         break;
1404                 case 25:
1405                         vc->vc_blink = 0;
1406                         break;
1407                 case 27:
1408                         vc->vc_reverse = 0;
1409                         break;
1410                 case 38:
1411                         i = vc_t416_color(vc, i, rgb_foreground);
1412                         break;
1413                 case 48:
1414                         i = vc_t416_color(vc, i, rgb_background);
1415                         break;
1416                 case 39:
1417                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1418                                 (vc->vc_color & 0xf0);
1419                         break;
1420                 case 49:
1421                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1422                                 (vc->vc_color & 0x0f);
1423                         break;
1424                 default:
1425                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1426                                 if (vc->vc_par[i] < 100)
1427                                         vc->vc_intensity = 2;
1428                                 vc->vc_par[i] -= 60;
1429                         }
1430                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1431                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1432                                         | (vc->vc_color & 0xf0);
1433                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1434                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1435                                         | (vc->vc_color & 0x0f);
1436                         break;
1437                 }
1438         update_attr(vc);
1439 }
1440
1441 static void respond_string(const char *p, struct tty_port *port)
1442 {
1443         while (*p) {
1444                 tty_insert_flip_char(port, *p, 0);
1445                 p++;
1446         }
1447         tty_schedule_flip(port);
1448 }
1449
1450 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1451 {
1452         char buf[40];
1453
1454         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1455         respond_string(buf, tty->port);
1456 }
1457
1458 static inline void status_report(struct tty_struct *tty)
1459 {
1460         respond_string("\033[0n", tty->port);   /* Terminal ok */
1461 }
1462
1463 static inline void respond_ID(struct tty_struct *tty)
1464 {
1465         respond_string(VT102ID, tty->port);
1466 }
1467
1468 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1469 {
1470         char buf[8];
1471
1472         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1473                 (char)('!' + mry));
1474         respond_string(buf, tty->port);
1475 }
1476
1477 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1478 int mouse_reporting(void)
1479 {
1480         return vc_cons[fg_console].d->vc_report_mouse;
1481 }
1482
1483 /* console_lock is held */
1484 static void set_mode(struct vc_data *vc, int on_off)
1485 {
1486         int i;
1487
1488         for (i = 0; i <= vc->vc_npar; i++)
1489                 if (vc->vc_ques) {
1490                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1491                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1492                                 if (on_off)
1493                                         set_kbd(vc, decckm);
1494                                 else
1495                                         clr_kbd(vc, decckm);
1496                                 break;
1497                         case 3: /* 80/132 mode switch unimplemented */
1498 #if 0
1499                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1500                                 /* this alone does not suffice; some user mode
1501                                    utility has to change the hardware regs */
1502 #endif
1503                                 break;
1504                         case 5:                 /* Inverted screen on/off */
1505                                 if (vc->vc_decscnm != on_off) {
1506                                         vc->vc_decscnm = on_off;
1507                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1508                                         update_attr(vc);
1509                                 }
1510                                 break;
1511                         case 6:                 /* Origin relative/absolute */
1512                                 vc->vc_decom = on_off;
1513                                 gotoxay(vc, 0, 0);
1514                                 break;
1515                         case 7:                 /* Autowrap on/off */
1516                                 vc->vc_decawm = on_off;
1517                                 break;
1518                         case 8:                 /* Autorepeat on/off */
1519                                 if (on_off)
1520                                         set_kbd(vc, decarm);
1521                                 else
1522                                         clr_kbd(vc, decarm);
1523                                 break;
1524                         case 9:
1525                                 vc->vc_report_mouse = on_off ? 1 : 0;
1526                                 break;
1527                         case 25:                /* Cursor on/off */
1528                                 vc->vc_deccm = on_off;
1529                                 break;
1530                         case 1000:
1531                                 vc->vc_report_mouse = on_off ? 2 : 0;
1532                                 break;
1533                         }
1534                 } else {
1535                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1536                         case 3:                 /* Monitor (display ctrls) */
1537                                 vc->vc_disp_ctrl = on_off;
1538                                 break;
1539                         case 4:                 /* Insert Mode on/off */
1540                                 vc->vc_decim = on_off;
1541                                 break;
1542                         case 20:                /* Lf, Enter == CrLf/Lf */
1543                                 if (on_off)
1544                                         set_kbd(vc, lnm);
1545                                 else
1546                                         clr_kbd(vc, lnm);
1547                                 break;
1548                         }
1549                 }
1550 }
1551
1552 /* console_lock is held */
1553 static void setterm_command(struct vc_data *vc)
1554 {
1555         switch(vc->vc_par[0]) {
1556                 case 1: /* set color for underline mode */
1557                         if (vc->vc_can_do_color &&
1558                                         vc->vc_par[1] < 16) {
1559                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1560                                 if (vc->vc_underline)
1561                                         update_attr(vc);
1562                         }
1563                         break;
1564                 case 2: /* set color for half intensity mode */
1565                         if (vc->vc_can_do_color &&
1566                                         vc->vc_par[1] < 16) {
1567                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1568                                 if (vc->vc_intensity == 0)
1569                                         update_attr(vc);
1570                         }
1571                         break;
1572                 case 8: /* store colors as defaults */
1573                         vc->vc_def_color = vc->vc_attr;
1574                         if (vc->vc_hi_font_mask == 0x100)
1575                                 vc->vc_def_color >>= 1;
1576                         default_attr(vc);
1577                         update_attr(vc);
1578                         break;
1579                 case 9: /* set blanking interval */
1580                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1581                         poke_blanked_console();
1582                         break;
1583                 case 10: /* set bell frequency in Hz */
1584                         if (vc->vc_npar >= 1)
1585                                 vc->vc_bell_pitch = vc->vc_par[1];
1586                         else
1587                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1588                         break;
1589                 case 11: /* set bell duration in msec */
1590                         if (vc->vc_npar >= 1)
1591                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1592                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1593                         else
1594                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1595                         break;
1596                 case 12: /* bring specified console to the front */
1597                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1598                                 set_console(vc->vc_par[1] - 1);
1599                         break;
1600                 case 13: /* unblank the screen */
1601                         poke_blanked_console();
1602                         break;
1603                 case 14: /* set vesa powerdown interval */
1604                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1605                         break;
1606                 case 15: /* activate the previous console */
1607                         set_console(last_console);
1608                         break;
1609                 case 16: /* set cursor blink duration in msec */
1610                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1611                                         vc->vc_par[1] <= USHRT_MAX)
1612                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1613                         else
1614                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1615                         break;
1616         }
1617 }
1618
1619 /* console_lock is held */
1620 static void csi_at(struct vc_data *vc, unsigned int nr)
1621 {
1622         if (nr > vc->vc_cols - vc->vc_x)
1623                 nr = vc->vc_cols - vc->vc_x;
1624         else if (!nr)
1625                 nr = 1;
1626         insert_char(vc, nr);
1627 }
1628
1629 /* console_lock is held */
1630 static void csi_L(struct vc_data *vc, unsigned int nr)
1631 {
1632         if (nr > vc->vc_rows - vc->vc_y)
1633                 nr = vc->vc_rows - vc->vc_y;
1634         else if (!nr)
1635                 nr = 1;
1636         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1637         vc->vc_need_wrap = 0;
1638 }
1639
1640 /* console_lock is held */
1641 static void csi_P(struct vc_data *vc, unsigned int nr)
1642 {
1643         if (nr > vc->vc_cols - vc->vc_x)
1644                 nr = vc->vc_cols - vc->vc_x;
1645         else if (!nr)
1646                 nr = 1;
1647         delete_char(vc, nr);
1648 }
1649
1650 /* console_lock is held */
1651 static void csi_M(struct vc_data *vc, unsigned int nr)
1652 {
1653         if (nr > vc->vc_rows - vc->vc_y)
1654                 nr = vc->vc_rows - vc->vc_y;
1655         else if (!nr)
1656                 nr=1;
1657         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1658         vc->vc_need_wrap = 0;
1659 }
1660
1661 /* console_lock is held (except via vc_init->reset_terminal */
1662 static void save_cur(struct vc_data *vc)
1663 {
1664         vc->vc_saved_x          = vc->vc_x;
1665         vc->vc_saved_y          = vc->vc_y;
1666         vc->vc_s_intensity      = vc->vc_intensity;
1667         vc->vc_s_italic         = vc->vc_italic;
1668         vc->vc_s_underline      = vc->vc_underline;
1669         vc->vc_s_blink          = vc->vc_blink;
1670         vc->vc_s_reverse        = vc->vc_reverse;
1671         vc->vc_s_charset        = vc->vc_charset;
1672         vc->vc_s_color          = vc->vc_color;
1673         vc->vc_saved_G0         = vc->vc_G0_charset;
1674         vc->vc_saved_G1         = vc->vc_G1_charset;
1675 }
1676
1677 /* console_lock is held */
1678 static void restore_cur(struct vc_data *vc)
1679 {
1680         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1681         vc->vc_intensity        = vc->vc_s_intensity;
1682         vc->vc_italic           = vc->vc_s_italic;
1683         vc->vc_underline        = vc->vc_s_underline;
1684         vc->vc_blink            = vc->vc_s_blink;
1685         vc->vc_reverse          = vc->vc_s_reverse;
1686         vc->vc_charset          = vc->vc_s_charset;
1687         vc->vc_color            = vc->vc_s_color;
1688         vc->vc_G0_charset       = vc->vc_saved_G0;
1689         vc->vc_G1_charset       = vc->vc_saved_G1;
1690         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1691         update_attr(vc);
1692         vc->vc_need_wrap = 0;
1693 }
1694
1695 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1696         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1697         ESpalette, ESosc };
1698
1699 /* console_lock is held (except via vc_init()) */
1700 static void reset_terminal(struct vc_data *vc, int do_clear)
1701 {
1702         vc->vc_top              = 0;
1703         vc->vc_bottom           = vc->vc_rows;
1704         vc->vc_state            = ESnormal;
1705         vc->vc_ques             = 0;
1706         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1707         vc->vc_G0_charset       = LAT1_MAP;
1708         vc->vc_G1_charset       = GRAF_MAP;
1709         vc->vc_charset          = 0;
1710         vc->vc_need_wrap        = 0;
1711         vc->vc_report_mouse     = 0;
1712         vc->vc_utf              = default_utf8;
1713         vc->vc_utf_count        = 0;
1714
1715         vc->vc_disp_ctrl        = 0;
1716         vc->vc_toggle_meta      = 0;
1717
1718         vc->vc_decscnm          = 0;
1719         vc->vc_decom            = 0;
1720         vc->vc_decawm           = 1;
1721         vc->vc_deccm            = global_cursor_default;
1722         vc->vc_decim            = 0;
1723
1724         vt_reset_keyboard(vc->vc_num);
1725
1726         vc->vc_cursor_type = cur_default;
1727         vc->vc_complement_mask = vc->vc_s_complement_mask;
1728
1729         default_attr(vc);
1730         update_attr(vc);
1731
1732         vc->vc_tab_stop[0]      =
1733         vc->vc_tab_stop[1]      =
1734         vc->vc_tab_stop[2]      =
1735         vc->vc_tab_stop[3]      =
1736         vc->vc_tab_stop[4]      =
1737         vc->vc_tab_stop[5]      =
1738         vc->vc_tab_stop[6]      =
1739         vc->vc_tab_stop[7]      = 0x01010101;
1740
1741         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1742         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1743         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1744
1745         gotoxy(vc, 0, 0);
1746         save_cur(vc);
1747         if (do_clear)
1748             csi_J(vc, 2);
1749 }
1750
1751 /* console_lock is held */
1752 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1753 {
1754         /*
1755          *  Control characters can be used in the _middle_
1756          *  of an escape sequence.
1757          */
1758         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1759                 return;
1760         switch (c) {
1761         case 0:
1762                 return;
1763         case 7:
1764                 if (vc->vc_state == ESosc)
1765                         vc->vc_state = ESnormal;
1766                 else if (vc->vc_bell_duration)
1767                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1768                 return;
1769         case 8:
1770                 bs(vc);
1771                 return;
1772         case 9:
1773                 vc->vc_pos -= (vc->vc_x << 1);
1774                 while (vc->vc_x < vc->vc_cols - 1) {
1775                         vc->vc_x++;
1776                         if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1777                                 break;
1778                 }
1779                 vc->vc_pos += (vc->vc_x << 1);
1780                 notify_write(vc, '\t');
1781                 return;
1782         case 10: case 11: case 12:
1783                 lf(vc);
1784                 if (!is_kbd(vc, lnm))
1785                         return;
1786         case 13:
1787                 cr(vc);
1788                 return;
1789         case 14:
1790                 vc->vc_charset = 1;
1791                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1792                 vc->vc_disp_ctrl = 1;
1793                 return;
1794         case 15:
1795                 vc->vc_charset = 0;
1796                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1797                 vc->vc_disp_ctrl = 0;
1798                 return;
1799         case 24: case 26:
1800                 vc->vc_state = ESnormal;
1801                 return;
1802         case 27:
1803                 vc->vc_state = ESesc;
1804                 return;
1805         case 127:
1806                 del(vc);
1807                 return;
1808         case 128+27:
1809                 vc->vc_state = ESsquare;
1810                 return;
1811         }
1812         switch(vc->vc_state) {
1813         case ESesc:
1814                 vc->vc_state = ESnormal;
1815                 switch (c) {
1816                 case '[':
1817                         vc->vc_state = ESsquare;
1818                         return;
1819                 case ']':
1820                         vc->vc_state = ESnonstd;
1821                         return;
1822                 case '%':
1823                         vc->vc_state = ESpercent;
1824                         return;
1825                 case 'E':
1826                         cr(vc);
1827                         lf(vc);
1828                         return;
1829                 case 'M':
1830                         ri(vc);
1831                         return;
1832                 case 'D':
1833                         lf(vc);
1834                         return;
1835                 case 'H':
1836                         vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1837                         return;
1838                 case 'Z':
1839                         respond_ID(tty);
1840                         return;
1841                 case '7':
1842                         save_cur(vc);
1843                         return;
1844                 case '8':
1845                         restore_cur(vc);
1846                         return;
1847                 case '(':
1848                         vc->vc_state = ESsetG0;
1849                         return;
1850                 case ')':
1851                         vc->vc_state = ESsetG1;
1852                         return;
1853                 case '#':
1854                         vc->vc_state = EShash;
1855                         return;
1856                 case 'c':
1857                         reset_terminal(vc, 1);
1858                         return;
1859                 case '>':  /* Numeric keypad */
1860                         clr_kbd(vc, kbdapplic);
1861                         return;
1862                 case '=':  /* Appl. keypad */
1863                         set_kbd(vc, kbdapplic);
1864                         return;
1865                 }
1866                 return;
1867         case ESnonstd:
1868                 if (c=='P') {   /* palette escape sequence */
1869                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1870                                 vc->vc_par[vc->vc_npar] = 0;
1871                         vc->vc_npar = 0;
1872                         vc->vc_state = ESpalette;
1873                         return;
1874                 } else if (c=='R') {   /* reset palette */
1875                         reset_palette(vc);
1876                         vc->vc_state = ESnormal;
1877                 } else if (c>='0' && c<='9')
1878                         vc->vc_state = ESosc;
1879                 else
1880                         vc->vc_state = ESnormal;
1881                 return;
1882         case ESpalette:
1883                 if (isxdigit(c)) {
1884                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1885                         if (vc->vc_npar == 7) {
1886                                 int i = vc->vc_par[0] * 3, j = 1;
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                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1892                                 vc->vc_palette[i] += vc->vc_par[j];
1893                                 set_palette(vc);
1894                                 vc->vc_state = ESnormal;
1895                         }
1896                 } else
1897                         vc->vc_state = ESnormal;
1898                 return;
1899         case ESsquare:
1900                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1901                         vc->vc_par[vc->vc_npar] = 0;
1902                 vc->vc_npar = 0;
1903                 vc->vc_state = ESgetpars;
1904                 if (c == '[') { /* Function key */
1905                         vc->vc_state=ESfunckey;
1906                         return;
1907                 }
1908                 vc->vc_ques = (c == '?');
1909                 if (vc->vc_ques)
1910                         return;
1911         case ESgetpars:
1912                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1913                         vc->vc_npar++;
1914                         return;
1915                 } else if (c>='0' && c<='9') {
1916                         vc->vc_par[vc->vc_npar] *= 10;
1917                         vc->vc_par[vc->vc_npar] += c - '0';
1918                         return;
1919                 }
1920                 vc->vc_state = ESnormal;
1921                 switch(c) {
1922                 case 'h':
1923                         set_mode(vc, 1);
1924                         return;
1925                 case 'l':
1926                         set_mode(vc, 0);
1927                         return;
1928                 case 'c':
1929                         if (vc->vc_ques) {
1930                                 if (vc->vc_par[0])
1931                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1932                                 else
1933                                         vc->vc_cursor_type = cur_default;
1934                                 return;
1935                         }
1936                         break;
1937                 case 'm':
1938                         if (vc->vc_ques) {
1939                                 clear_selection();
1940                                 if (vc->vc_par[0])
1941                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1942                                 else
1943                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1944                                 return;
1945                         }
1946                         break;
1947                 case 'n':
1948                         if (!vc->vc_ques) {
1949                                 if (vc->vc_par[0] == 5)
1950                                         status_report(tty);
1951                                 else if (vc->vc_par[0] == 6)
1952                                         cursor_report(vc, tty);
1953                         }
1954                         return;
1955                 }
1956                 if (vc->vc_ques) {
1957                         vc->vc_ques = 0;
1958                         return;
1959                 }
1960                 switch(c) {
1961                 case 'G': case '`':
1962                         if (vc->vc_par[0])
1963                                 vc->vc_par[0]--;
1964                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1965                         return;
1966                 case 'A':
1967                         if (!vc->vc_par[0])
1968                                 vc->vc_par[0]++;
1969                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1970                         return;
1971                 case 'B': case 'e':
1972                         if (!vc->vc_par[0])
1973                                 vc->vc_par[0]++;
1974                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1975                         return;
1976                 case 'C': case 'a':
1977                         if (!vc->vc_par[0])
1978                                 vc->vc_par[0]++;
1979                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1980                         return;
1981                 case 'D':
1982                         if (!vc->vc_par[0])
1983                                 vc->vc_par[0]++;
1984                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1985                         return;
1986                 case 'E':
1987                         if (!vc->vc_par[0])
1988                                 vc->vc_par[0]++;
1989                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1990                         return;
1991                 case 'F':
1992                         if (!vc->vc_par[0])
1993                                 vc->vc_par[0]++;
1994                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1995                         return;
1996                 case 'd':
1997                         if (vc->vc_par[0])
1998                                 vc->vc_par[0]--;
1999                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2000                         return;
2001                 case 'H': case 'f':
2002                         if (vc->vc_par[0])
2003                                 vc->vc_par[0]--;
2004                         if (vc->vc_par[1])
2005                                 vc->vc_par[1]--;
2006                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2007                         return;
2008                 case 'J':
2009                         csi_J(vc, vc->vc_par[0]);
2010                         return;
2011                 case 'K':
2012                         csi_K(vc, vc->vc_par[0]);
2013                         return;
2014                 case 'L':
2015                         csi_L(vc, vc->vc_par[0]);
2016                         return;
2017                 case 'M':
2018                         csi_M(vc, vc->vc_par[0]);
2019                         return;
2020                 case 'P':
2021                         csi_P(vc, vc->vc_par[0]);
2022                         return;
2023                 case 'c':
2024                         if (!vc->vc_par[0])
2025                                 respond_ID(tty);
2026                         return;
2027                 case 'g':
2028                         if (!vc->vc_par[0])
2029                                 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2030                         else if (vc->vc_par[0] == 3) {
2031                                 vc->vc_tab_stop[0] =
2032                                         vc->vc_tab_stop[1] =
2033                                         vc->vc_tab_stop[2] =
2034                                         vc->vc_tab_stop[3] =
2035                                         vc->vc_tab_stop[4] =
2036                                         vc->vc_tab_stop[5] =
2037                                         vc->vc_tab_stop[6] =
2038                                         vc->vc_tab_stop[7] = 0;
2039                         }
2040                         return;
2041                 case 'm':
2042                         csi_m(vc);
2043                         return;
2044                 case 'q': /* DECLL - but only 3 leds */
2045                         /* map 0,1,2,3 to 0,1,2,4 */
2046                         if (vc->vc_par[0] < 4)
2047                                 vt_set_led_state(vc->vc_num,
2048                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2049                         return;
2050                 case 'r':
2051                         if (!vc->vc_par[0])
2052                                 vc->vc_par[0]++;
2053                         if (!vc->vc_par[1])
2054                                 vc->vc_par[1] = vc->vc_rows;
2055                         /* Minimum allowed region is 2 lines */
2056                         if (vc->vc_par[0] < vc->vc_par[1] &&
2057                             vc->vc_par[1] <= vc->vc_rows) {
2058                                 vc->vc_top = vc->vc_par[0] - 1;
2059                                 vc->vc_bottom = vc->vc_par[1];
2060                                 gotoxay(vc, 0, 0);
2061                         }
2062                         return;
2063                 case 's':
2064                         save_cur(vc);
2065                         return;
2066                 case 'u':
2067                         restore_cur(vc);
2068                         return;
2069                 case 'X':
2070                         csi_X(vc, vc->vc_par[0]);
2071                         return;
2072                 case '@':
2073                         csi_at(vc, vc->vc_par[0]);
2074                         return;
2075                 case ']': /* setterm functions */
2076                         setterm_command(vc);
2077                         return;
2078                 }
2079                 return;
2080         case ESpercent:
2081                 vc->vc_state = ESnormal;
2082                 switch (c) {
2083                 case '@':  /* defined in ISO 2022 */
2084                         vc->vc_utf = 0;
2085                         return;
2086                 case 'G':  /* prelim official escape code */
2087                 case '8':  /* retained for compatibility */
2088                         vc->vc_utf = 1;
2089                         return;
2090                 }
2091                 return;
2092         case ESfunckey:
2093                 vc->vc_state = ESnormal;
2094                 return;
2095         case EShash:
2096                 vc->vc_state = ESnormal;
2097                 if (c == '8') {
2098                         /* DEC screen alignment test. kludge :-) */
2099                         vc->vc_video_erase_char =
2100                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2101                         csi_J(vc, 2);
2102                         vc->vc_video_erase_char =
2103                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2104                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2105                 }
2106                 return;
2107         case ESsetG0:
2108                 if (c == '0')
2109                         vc->vc_G0_charset = GRAF_MAP;
2110                 else if (c == 'B')
2111                         vc->vc_G0_charset = LAT1_MAP;
2112                 else if (c == 'U')
2113                         vc->vc_G0_charset = IBMPC_MAP;
2114                 else if (c == 'K')
2115                         vc->vc_G0_charset = USER_MAP;
2116                 if (vc->vc_charset == 0)
2117                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2118                 vc->vc_state = ESnormal;
2119                 return;
2120         case ESsetG1:
2121                 if (c == '0')
2122                         vc->vc_G1_charset = GRAF_MAP;
2123                 else if (c == 'B')
2124                         vc->vc_G1_charset = LAT1_MAP;
2125                 else if (c == 'U')
2126                         vc->vc_G1_charset = IBMPC_MAP;
2127                 else if (c == 'K')
2128                         vc->vc_G1_charset = USER_MAP;
2129                 if (vc->vc_charset == 1)
2130                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2131                 vc->vc_state = ESnormal;
2132                 return;
2133         case ESosc:
2134                 return;
2135         default:
2136                 vc->vc_state = ESnormal;
2137         }
2138 }
2139
2140 /* is_double_width() is based on the wcwidth() implementation by
2141  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2142  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2143  */
2144 struct interval {
2145         uint32_t first;
2146         uint32_t last;
2147 };
2148
2149 static int ucs_cmp(const void *key, const void *elt)
2150 {
2151         uint32_t ucs = *(uint32_t *)key;
2152         struct interval e = *(struct interval *) elt;
2153
2154         if (ucs > e.last)
2155                 return 1;
2156         else if (ucs < e.first)
2157                 return -1;
2158         return 0;
2159 }
2160
2161 static int is_double_width(uint32_t ucs)
2162 {
2163         static const struct interval double_width[] = {
2164                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2165                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2166                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2167                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2168         };
2169         if (ucs < double_width[0].first ||
2170             ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2171                 return 0;
2172
2173         return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2174                         sizeof(struct interval), ucs_cmp) != NULL;
2175 }
2176
2177 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2178                 unsigned long draw_to, int *draw_x)
2179 {
2180         if (*draw_x < 0)
2181                 return;
2182
2183         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2184                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2185         *draw_x = -1;
2186 }
2187
2188 /* acquires console_lock */
2189 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2190 {
2191         int c, tc, ok, n = 0, draw_x = -1;
2192         unsigned int currcons;
2193         unsigned long draw_from = 0, draw_to = 0;
2194         struct vc_data *vc;
2195         unsigned char vc_attr;
2196         struct vt_notifier_param param;
2197         uint8_t rescan;
2198         uint8_t inverse;
2199         uint8_t width;
2200         u16 himask, charmask;
2201
2202         if (in_interrupt())
2203                 return count;
2204
2205         might_sleep();
2206
2207         console_lock();
2208         vc = tty->driver_data;
2209         if (vc == NULL) {
2210                 pr_err("vt: argh, driver_data is NULL !\n");
2211                 console_unlock();
2212                 return 0;
2213         }
2214
2215         currcons = vc->vc_num;
2216         if (!vc_cons_allocated(currcons)) {
2217                 /* could this happen? */
2218                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2219                 console_unlock();
2220                 return 0;
2221         }
2222
2223         himask = vc->vc_hi_font_mask;
2224         charmask = himask ? 0x1ff : 0xff;
2225
2226         /* undraw cursor first */
2227         if (con_is_fg(vc))
2228                 hide_cursor(vc);
2229
2230         param.vc = vc;
2231
2232         while (!tty->stopped && count) {
2233                 int orig = *buf;
2234                 c = orig;
2235                 buf++;
2236                 n++;
2237                 count--;
2238                 rescan = 0;
2239                 inverse = 0;
2240                 width = 1;
2241
2242                 /* Do no translation at all in control states */
2243                 if (vc->vc_state != ESnormal) {
2244                         tc = c;
2245                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2246                     /* Combine UTF-8 into Unicode in vc_utf_char.
2247                      * vc_utf_count is the number of continuation bytes still
2248                      * expected to arrive.
2249                      * vc_npar is the number of continuation bytes arrived so
2250                      * far
2251                      */
2252 rescan_last_byte:
2253                     if ((c & 0xc0) == 0x80) {
2254                         /* Continuation byte received */
2255                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2256                         if (vc->vc_utf_count) {
2257                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2258                             vc->vc_npar++;
2259                             if (--vc->vc_utf_count) {
2260                                 /* Still need some bytes */
2261                                 continue;
2262                             }
2263                             /* Got a whole character */
2264                             c = vc->vc_utf_char;
2265                             /* Reject overlong sequences */
2266                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2267                                         c > utf8_length_changes[vc->vc_npar])
2268                                 c = 0xfffd;
2269                         } else {
2270                             /* Unexpected continuation byte */
2271                             vc->vc_utf_count = 0;
2272                             c = 0xfffd;
2273                         }
2274                     } else {
2275                         /* Single ASCII byte or first byte of a sequence received */
2276                         if (vc->vc_utf_count) {
2277                             /* Continuation byte expected */
2278                             rescan = 1;
2279                             vc->vc_utf_count = 0;
2280                             c = 0xfffd;
2281                         } else if (c > 0x7f) {
2282                             /* First byte of a multibyte sequence received */
2283                             vc->vc_npar = 0;
2284                             if ((c & 0xe0) == 0xc0) {
2285                                 vc->vc_utf_count = 1;
2286                                 vc->vc_utf_char = (c & 0x1f);
2287                             } else if ((c & 0xf0) == 0xe0) {
2288                                 vc->vc_utf_count = 2;
2289                                 vc->vc_utf_char = (c & 0x0f);
2290                             } else if ((c & 0xf8) == 0xf0) {
2291                                 vc->vc_utf_count = 3;
2292                                 vc->vc_utf_char = (c & 0x07);
2293                             } else if ((c & 0xfc) == 0xf8) {
2294                                 vc->vc_utf_count = 4;
2295                                 vc->vc_utf_char = (c & 0x03);
2296                             } else if ((c & 0xfe) == 0xfc) {
2297                                 vc->vc_utf_count = 5;
2298                                 vc->vc_utf_char = (c & 0x01);
2299                             } else {
2300                                 /* 254 and 255 are invalid */
2301                                 c = 0xfffd;
2302                             }
2303                             if (vc->vc_utf_count) {
2304                                 /* Still need some bytes */
2305                                 continue;
2306                             }
2307                         }
2308                         /* Nothing to do if an ASCII byte was received */
2309                     }
2310                     /* End of UTF-8 decoding. */
2311                     /* c is the received character, or U+FFFD for invalid sequences. */
2312                     /* Replace invalid Unicode code points with U+FFFD too */
2313                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2314                         c = 0xfffd;
2315                     tc = c;
2316                 } else {        /* no utf or alternate charset mode */
2317                     tc = vc_translate(vc, c);
2318                 }
2319
2320                 param.c = tc;
2321                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2322                                         &param) == NOTIFY_STOP)
2323                         continue;
2324
2325                 /* If the original code was a control character we
2326                  * only allow a glyph to be displayed if the code is
2327                  * not normally used (such as for cursor movement) or
2328                  * if the disp_ctrl mode has been explicitly enabled.
2329                  * Certain characters (as given by the CTRL_ALWAYS
2330                  * bitmap) are always displayed as control characters,
2331                  * as the console would be pretty useless without
2332                  * them; to display an arbitrary font position use the
2333                  * direct-to-font zone in UTF-8 mode.
2334                  */
2335                 ok = tc && (c >= 32 ||
2336                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2337                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2338                         && (c != 127 || vc->vc_disp_ctrl)
2339                         && (c != 128+27);
2340
2341                 if (vc->vc_state == ESnormal && ok) {
2342                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2343                                 if (is_double_width(c))
2344                                         width = 2;
2345                         }
2346                         /* Now try to find out how to display it */
2347                         tc = conv_uni_to_pc(vc, tc);
2348                         if (tc & ~charmask) {
2349                                 if (tc == -1 || tc == -2) {
2350                                     continue; /* nothing to display */
2351                                 }
2352                                 /* Glyph not found */
2353                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2354                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2355                                        This would make absolutely no sense with Unicode in mind,
2356                                        but do this for ASCII characters since a font may lack
2357                                        Unicode mapping info and we don't want to end up with
2358                                        having question marks only. */
2359                                     tc = c;
2360                                 } else {
2361                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2362                                     tc = conv_uni_to_pc(vc, 0xfffd);
2363                                     if (tc < 0) {
2364                                         inverse = 1;
2365                                         tc = conv_uni_to_pc(vc, '?');
2366                                         if (tc < 0) tc = '?';
2367                                     }
2368                                 }
2369                         }
2370
2371                         if (!inverse) {
2372                                 vc_attr = vc->vc_attr;
2373                         } else {
2374                                 /* invert vc_attr */
2375                                 if (!vc->vc_can_do_color) {
2376                                         vc_attr = (vc->vc_attr) ^ 0x08;
2377                                 } else if (vc->vc_hi_font_mask == 0x100) {
2378                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2379                                 } else {
2380                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2381                                 }
2382                                 con_flush(vc, draw_from, draw_to, &draw_x);
2383                         }
2384
2385                         while (1) {
2386                                 if (vc->vc_need_wrap || vc->vc_decim)
2387                                         con_flush(vc, draw_from, draw_to,
2388                                                         &draw_x);
2389                                 if (vc->vc_need_wrap) {
2390                                         cr(vc);
2391                                         lf(vc);
2392                                 }
2393                                 if (vc->vc_decim)
2394                                         insert_char(vc, 1);
2395                                 scr_writew(himask ?
2396                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2397                                              (vc_attr << 8) + tc,
2398                                            (u16 *) vc->vc_pos);
2399                                 if (con_should_update(vc) && draw_x < 0) {
2400                                         draw_x = vc->vc_x;
2401                                         draw_from = vc->vc_pos;
2402                                 }
2403                                 if (vc->vc_x == vc->vc_cols - 1) {
2404                                         vc->vc_need_wrap = vc->vc_decawm;
2405                                         draw_to = vc->vc_pos + 2;
2406                                 } else {
2407                                         vc->vc_x++;
2408                                         draw_to = (vc->vc_pos += 2);
2409                                 }
2410
2411                                 if (!--width) break;
2412
2413                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2414                                 if (tc < 0) tc = ' ';
2415                         }
2416                         notify_write(vc, c);
2417
2418                         if (inverse)
2419                                 con_flush(vc, draw_from, draw_to, &draw_x);
2420
2421                         if (rescan) {
2422                                 rescan = 0;
2423                                 inverse = 0;
2424                                 width = 1;
2425                                 c = orig;
2426                                 goto rescan_last_byte;
2427                         }
2428                         continue;
2429                 }
2430                 con_flush(vc, draw_from, draw_to, &draw_x);
2431                 do_con_trol(tty, vc, orig);
2432         }
2433         con_flush(vc, draw_from, draw_to, &draw_x);
2434         console_conditional_schedule();
2435         console_unlock();
2436         notify_update(vc);
2437         return n;
2438 }
2439
2440 /*
2441  * This is the console switching callback.
2442  *
2443  * Doing console switching in a process context allows
2444  * us to do the switches asynchronously (needed when we want
2445  * to switch due to a keyboard interrupt).  Synchronization
2446  * with other console code and prevention of re-entrancy is
2447  * ensured with console_lock.
2448  */
2449 static void console_callback(struct work_struct *ignored)
2450 {
2451         console_lock();
2452
2453         if (want_console >= 0) {
2454                 if (want_console != fg_console &&
2455                     vc_cons_allocated(want_console)) {
2456                         hide_cursor(vc_cons[fg_console].d);
2457                         change_console(vc_cons[want_console].d);
2458                         /* we only changed when the console had already
2459                            been allocated - a new console is not created
2460                            in an interrupt routine */
2461                 }
2462                 want_console = -1;
2463         }
2464         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2465                 do_poke_blanked_console = 0;
2466                 poke_blanked_console();
2467         }
2468         if (scrollback_delta) {
2469                 struct vc_data *vc = vc_cons[fg_console].d;
2470                 clear_selection();
2471                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2472                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2473                 scrollback_delta = 0;
2474         }
2475         if (blank_timer_expired) {
2476                 do_blank_screen(0);
2477                 blank_timer_expired = 0;
2478         }
2479         notify_update(vc_cons[fg_console].d);
2480
2481         console_unlock();
2482 }
2483
2484 int set_console(int nr)
2485 {
2486         struct vc_data *vc = vc_cons[fg_console].d;
2487
2488         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2489                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2490
2491                 /*
2492                  * Console switch will fail in console_callback() or
2493                  * change_console() so there is no point scheduling
2494                  * the callback
2495                  *
2496                  * Existing set_console() users don't check the return
2497                  * value so this shouldn't break anything
2498                  */
2499                 return -EINVAL;
2500         }
2501
2502         want_console = nr;
2503         schedule_console_callback();
2504
2505         return 0;
2506 }
2507
2508 struct tty_driver *console_driver;
2509
2510 #ifdef CONFIG_VT_CONSOLE
2511
2512 /**
2513  * vt_kmsg_redirect() - Sets/gets the kernel message console
2514  * @new:        The new virtual terminal number or -1 if the console should stay
2515  *              unchanged
2516  *
2517  * By default, the kernel messages are always printed on the current virtual
2518  * console. However, the user may modify that default with the
2519  * TIOCL_SETKMSGREDIRECT ioctl call.
2520  *
2521  * This function sets the kernel message console to be @new. It returns the old
2522  * virtual console number. The virtual terminal number 0 (both as parameter and
2523  * return value) means no redirection (i.e. always printed on the currently
2524  * active console).
2525  *
2526  * The parameter -1 means that only the current console is returned, but the
2527  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2528  * case to make the code more understandable.
2529  *
2530  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2531  * the parameter and always returns 0.
2532  */
2533 int vt_kmsg_redirect(int new)
2534 {
2535         static int kmsg_con;
2536
2537         if (new != -1)
2538                 return xchg(&kmsg_con, new);
2539         else
2540                 return kmsg_con;
2541 }
2542
2543 /*
2544  *      Console on virtual terminal
2545  *
2546  * The console must be locked when we get here.
2547  */
2548
2549 static void vt_console_print(struct console *co, const char *b, unsigned count)
2550 {
2551         struct vc_data *vc = vc_cons[fg_console].d;
2552         unsigned char c;
2553         static DEFINE_SPINLOCK(printing_lock);
2554         const ushort *start;
2555         ushort cnt = 0;
2556         ushort myx;
2557         int kmsg_console;
2558
2559         /* console busy or not yet initialized */
2560         if (!printable)
2561                 return;
2562         if (!spin_trylock(&printing_lock))
2563                 return;
2564
2565         kmsg_console = vt_get_kmsg_redirect();
2566         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2567                 vc = vc_cons[kmsg_console - 1].d;
2568
2569         /* read `x' only after setting currcons properly (otherwise
2570            the `x' macro will read the x of the foreground console). */
2571         myx = vc->vc_x;
2572
2573         if (!vc_cons_allocated(fg_console)) {
2574                 /* impossible */
2575                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2576                 goto quit;
2577         }
2578
2579         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2580                 goto quit;
2581
2582         /* undraw cursor first */
2583         if (con_is_fg(vc))
2584                 hide_cursor(vc);
2585
2586         start = (ushort *)vc->vc_pos;
2587
2588         /* Contrived structure to try to emulate original need_wrap behaviour
2589          * Problems caused when we have need_wrap set on '\n' character */
2590         while (count--) {
2591                 c = *b++;
2592                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2593                         if (cnt > 0) {
2594                                 if (con_is_visible(vc))
2595                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2596                                 vc->vc_x += cnt;
2597                                 if (vc->vc_need_wrap)
2598                                         vc->vc_x--;
2599                                 cnt = 0;
2600                         }
2601                         if (c == 8) {           /* backspace */
2602                                 bs(vc);
2603                                 start = (ushort *)vc->vc_pos;
2604                                 myx = vc->vc_x;
2605                                 continue;
2606                         }
2607                         if (c != 13)
2608                                 lf(vc);
2609                         cr(vc);
2610                         start = (ushort *)vc->vc_pos;
2611                         myx = vc->vc_x;
2612                         if (c == 10 || c == 13)
2613                                 continue;
2614                 }
2615                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2616                 notify_write(vc, c);
2617                 cnt++;
2618                 if (myx == vc->vc_cols - 1) {
2619                         vc->vc_need_wrap = 1;
2620                         continue;
2621                 }
2622                 vc->vc_pos += 2;
2623                 myx++;
2624         }
2625         if (cnt > 0) {
2626                 if (con_is_visible(vc))
2627                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2628                 vc->vc_x += cnt;
2629                 if (vc->vc_x == vc->vc_cols) {
2630                         vc->vc_x--;
2631                         vc->vc_need_wrap = 1;
2632                 }
2633         }
2634         set_cursor(vc);
2635         notify_update(vc);
2636
2637 quit:
2638         spin_unlock(&printing_lock);
2639 }
2640
2641 static struct tty_driver *vt_console_device(struct console *c, int *index)
2642 {
2643         *index = c->index ? c->index-1 : fg_console;
2644         return console_driver;
2645 }
2646
2647 static struct console vt_console_driver = {
2648         .name           = "tty",
2649         .write          = vt_console_print,
2650         .device         = vt_console_device,
2651         .unblank        = unblank_screen,
2652         .flags          = CON_PRINTBUFFER,
2653         .index          = -1,
2654 };
2655 #endif
2656
2657 /*
2658  *      Handling of Linux-specific VC ioctls
2659  */
2660
2661 /*
2662  * Generally a bit racy with respect to console_lock();.
2663  *
2664  * There are some functions which don't need it.
2665  *
2666  * There are some functions which can sleep for arbitrary periods
2667  * (paste_selection) but we don't need the lock there anyway.
2668  *
2669  * set_selection has locking, and definitely needs it
2670  */
2671
2672 int tioclinux(struct tty_struct *tty, unsigned long arg)
2673 {
2674         char type, data;
2675         char __user *p = (char __user *)arg;
2676         int lines;
2677         int ret;
2678
2679         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2680                 return -EPERM;
2681         if (get_user(type, p))
2682                 return -EFAULT;
2683         ret = 0;
2684
2685         switch (type)
2686         {
2687                 case TIOCL_SETSEL:
2688                         console_lock();
2689                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2690                         console_unlock();
2691                         break;
2692                 case TIOCL_PASTESEL:
2693                         ret = paste_selection(tty);
2694                         break;
2695                 case TIOCL_UNBLANKSCREEN:
2696                         console_lock();
2697                         unblank_screen();
2698                         console_unlock();
2699                         break;
2700                 case TIOCL_SELLOADLUT:
2701                         console_lock();
2702                         ret = sel_loadlut(p);
2703                         console_unlock();
2704                         break;
2705                 case TIOCL_GETSHIFTSTATE:
2706
2707         /*
2708          * Make it possible to react to Shift+Mousebutton.
2709          * Note that 'shift_state' is an undocumented
2710          * kernel-internal variable; programs not closely
2711          * related to the kernel should not use this.
2712          */
2713                         data = vt_get_shift_state();
2714                         ret = put_user(data, p);
2715                         break;
2716                 case TIOCL_GETMOUSEREPORTING:
2717                         console_lock(); /* May be overkill */
2718                         data = mouse_reporting();
2719                         console_unlock();
2720                         ret = put_user(data, p);
2721                         break;
2722                 case TIOCL_SETVESABLANK:
2723                         console_lock();
2724                         ret = set_vesa_blanking(p);
2725                         console_unlock();
2726                         break;
2727                 case TIOCL_GETKMSGREDIRECT:
2728                         data = vt_get_kmsg_redirect();
2729                         ret = put_user(data, p);
2730                         break;
2731                 case TIOCL_SETKMSGREDIRECT:
2732                         if (!capable(CAP_SYS_ADMIN)) {
2733                                 ret = -EPERM;
2734                         } else {
2735                                 if (get_user(data, p+1))
2736                                         ret = -EFAULT;
2737                                 else
2738                                         vt_kmsg_redirect(data);
2739                         }
2740                         break;
2741                 case TIOCL_GETFGCONSOLE:
2742                         /* No locking needed as this is a transiently
2743                            correct return anyway if the caller hasn't
2744                            disabled switching */
2745                         ret = fg_console;
2746                         break;
2747                 case TIOCL_SCROLLCONSOLE:
2748                         if (get_user(lines, (s32 __user *)(p+4))) {
2749                                 ret = -EFAULT;
2750                         } else {
2751                                 /* Need the console lock here. Note that lots
2752                                    of other calls need fixing before the lock
2753                                    is actually useful ! */
2754                                 console_lock();
2755                                 scrollfront(vc_cons[fg_console].d, lines);
2756                                 console_unlock();
2757                                 ret = 0;
2758                         }
2759                         break;
2760                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2761                         console_lock();
2762                         ignore_poke = 1;
2763                         do_blank_screen(0);
2764                         console_unlock();
2765                         break;
2766                 case TIOCL_BLANKEDSCREEN:
2767                         ret = console_blanked;
2768                         break;
2769                 default:
2770                         ret = -EINVAL;
2771                         break;
2772         }
2773         return ret;
2774 }
2775
2776 /*
2777  * /dev/ttyN handling
2778  */
2779
2780 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2781 {
2782         int     retval;
2783
2784         retval = do_con_write(tty, buf, count);
2785         con_flush_chars(tty);
2786
2787         return retval;
2788 }
2789
2790 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2791 {
2792         if (in_interrupt())
2793                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2794         return do_con_write(tty, &ch, 1);
2795 }
2796
2797 static int con_write_room(struct tty_struct *tty)
2798 {
2799         if (tty->stopped)
2800                 return 0;
2801         return 32768;           /* No limit, really; we're not buffering */
2802 }
2803
2804 static int con_chars_in_buffer(struct tty_struct *tty)
2805 {
2806         return 0;               /* we're not buffering */
2807 }
2808
2809 /*
2810  * con_throttle and con_unthrottle are only used for
2811  * paste_selection(), which has to stuff in a large number of
2812  * characters...
2813  */
2814 static void con_throttle(struct tty_struct *tty)
2815 {
2816 }
2817
2818 static void con_unthrottle(struct tty_struct *tty)
2819 {
2820         struct vc_data *vc = tty->driver_data;
2821
2822         wake_up_interruptible(&vc->paste_wait);
2823 }
2824
2825 /*
2826  * Turn the Scroll-Lock LED on when the tty is stopped
2827  */
2828 static void con_stop(struct tty_struct *tty)
2829 {
2830         int console_num;
2831         if (!tty)
2832                 return;
2833         console_num = tty->index;
2834         if (!vc_cons_allocated(console_num))
2835                 return;
2836         vt_kbd_con_stop(console_num);
2837 }
2838
2839 /*
2840  * Turn the Scroll-Lock LED off when the console is started
2841  */
2842 static void con_start(struct tty_struct *tty)
2843 {
2844         int console_num;
2845         if (!tty)
2846                 return;
2847         console_num = tty->index;
2848         if (!vc_cons_allocated(console_num))
2849                 return;
2850         vt_kbd_con_start(console_num);
2851 }
2852
2853 static void con_flush_chars(struct tty_struct *tty)
2854 {
2855         struct vc_data *vc;
2856
2857         if (in_interrupt())     /* from flush_to_ldisc */
2858                 return;
2859
2860         /* if we race with con_close(), vt may be null */
2861         console_lock();
2862         vc = tty->driver_data;
2863         if (vc)
2864                 set_cursor(vc);
2865         console_unlock();
2866 }
2867
2868 /*
2869  * Allocate the console screen memory.
2870  */
2871 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2872 {
2873         unsigned int currcons = tty->index;
2874         struct vc_data *vc;
2875         int ret;
2876
2877         console_lock();
2878         ret = vc_allocate(currcons);
2879         if (ret)
2880                 goto unlock;
2881
2882         vc = vc_cons[currcons].d;
2883
2884         /* Still being freed */
2885         if (vc->port.tty) {
2886                 ret = -ERESTARTSYS;
2887                 goto unlock;
2888         }
2889
2890         ret = tty_port_install(&vc->port, driver, tty);
2891         if (ret)
2892                 goto unlock;
2893
2894         tty->driver_data = vc;
2895         vc->port.tty = tty;
2896
2897         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2898                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2899                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2900         }
2901         if (vc->vc_utf)
2902                 tty->termios.c_iflag |= IUTF8;
2903         else
2904                 tty->termios.c_iflag &= ~IUTF8;
2905 unlock:
2906         console_unlock();
2907         return ret;
2908 }
2909
2910 static int con_open(struct tty_struct *tty, struct file *filp)
2911 {
2912         /* everything done in install */
2913         return 0;
2914 }
2915
2916
2917 static void con_close(struct tty_struct *tty, struct file *filp)
2918 {
2919         /* Nothing to do - we defer to shutdown */
2920 }
2921
2922 static void con_shutdown(struct tty_struct *tty)
2923 {
2924         struct vc_data *vc = tty->driver_data;
2925         BUG_ON(vc == NULL);
2926         console_lock();
2927         vc->port.tty = NULL;
2928         console_unlock();
2929 }
2930
2931 static int default_color           = 7; /* white */
2932 static int default_italic_color    = 2; // green (ASCII)
2933 static int default_underline_color = 3; // cyan (ASCII)
2934 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2935 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2936 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2937
2938 static void vc_init(struct vc_data *vc, unsigned int rows,
2939                     unsigned int cols, int do_clear)
2940 {
2941         int j, k ;
2942
2943         vc->vc_cols = cols;
2944         vc->vc_rows = rows;
2945         vc->vc_size_row = cols << 1;
2946         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2947
2948         set_origin(vc);
2949         vc->vc_pos = vc->vc_origin;
2950         reset_vc(vc);
2951         for (j=k=0; j<16; j++) {
2952                 vc->vc_palette[k++] = default_red[j] ;
2953                 vc->vc_palette[k++] = default_grn[j] ;
2954                 vc->vc_palette[k++] = default_blu[j] ;
2955         }
2956         vc->vc_def_color       = default_color;
2957         vc->vc_ulcolor         = default_underline_color;
2958         vc->vc_itcolor         = default_italic_color;
2959         vc->vc_halfcolor       = 0x08;   /* grey */
2960         init_waitqueue_head(&vc->paste_wait);
2961         reset_terminal(vc, do_clear);
2962 }
2963
2964 /*
2965  * This routine initializes console interrupts, and does nothing
2966  * else. If you want the screen to clear, call tty_write with
2967  * the appropriate escape-sequence.
2968  */
2969
2970 static int __init con_init(void)
2971 {
2972         const char *display_desc = NULL;
2973         struct vc_data *vc;
2974         unsigned int currcons = 0, i;
2975
2976         console_lock();
2977
2978         if (conswitchp)
2979                 display_desc = conswitchp->con_startup();
2980         if (!display_desc) {
2981                 fg_console = 0;
2982                 console_unlock();
2983                 return 0;
2984         }
2985
2986         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2987                 struct con_driver *con_driver = &registered_con_driver[i];
2988
2989                 if (con_driver->con == NULL) {
2990                         con_driver->con = conswitchp;
2991                         con_driver->desc = display_desc;
2992                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2993                         con_driver->first = 0;
2994                         con_driver->last = MAX_NR_CONSOLES - 1;
2995                         break;
2996                 }
2997         }
2998
2999         for (i = 0; i < MAX_NR_CONSOLES; i++)
3000                 con_driver_map[i] = conswitchp;
3001
3002         if (blankinterval) {
3003                 blank_state = blank_normal_wait;
3004                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3005         }
3006
3007         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3008                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3009                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3010                 tty_port_init(&vc->port);
3011                 visual_init(vc, currcons, 1);
3012                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3013                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3014                         currcons || !vc->vc_sw->con_save_screen);
3015         }
3016         currcons = fg_console = 0;
3017         master_display_fg = vc = vc_cons[currcons].d;
3018         set_origin(vc);
3019         save_screen(vc);
3020         gotoxy(vc, vc->vc_x, vc->vc_y);
3021         csi_J(vc, 0);
3022         update_screen(vc);
3023         pr_info("Console: %s %s %dx%d\n",
3024                 vc->vc_can_do_color ? "colour" : "mono",
3025                 display_desc, vc->vc_cols, vc->vc_rows);
3026         printable = 1;
3027
3028         console_unlock();
3029
3030 #ifdef CONFIG_VT_CONSOLE
3031         register_console(&vt_console_driver);
3032 #endif
3033         return 0;
3034 }
3035 console_initcall(con_init);
3036
3037 static const struct tty_operations con_ops = {
3038         .install = con_install,
3039         .open = con_open,
3040         .close = con_close,
3041         .write = con_write,
3042         .write_room = con_write_room,
3043         .put_char = con_put_char,
3044         .flush_chars = con_flush_chars,
3045         .chars_in_buffer = con_chars_in_buffer,
3046         .ioctl = vt_ioctl,
3047 #ifdef CONFIG_COMPAT
3048         .compat_ioctl = vt_compat_ioctl,
3049 #endif
3050         .stop = con_stop,
3051         .start = con_start,
3052         .throttle = con_throttle,
3053         .unthrottle = con_unthrottle,
3054         .resize = vt_resize,
3055         .shutdown = con_shutdown
3056 };
3057
3058 static struct cdev vc0_cdev;
3059
3060 static ssize_t show_tty_active(struct device *dev,
3061                                 struct device_attribute *attr, char *buf)
3062 {
3063         return sprintf(buf, "tty%d\n", fg_console + 1);
3064 }
3065 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3066
3067 static struct attribute *vt_dev_attrs[] = {
3068         &dev_attr_active.attr,
3069         NULL
3070 };
3071
3072 ATTRIBUTE_GROUPS(vt_dev);
3073
3074 int __init vty_init(const struct file_operations *console_fops)
3075 {
3076         cdev_init(&vc0_cdev, console_fops);
3077         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3078             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3079                 panic("Couldn't register /dev/tty0 driver\n");
3080         tty0dev = device_create_with_groups(tty_class, NULL,
3081                                             MKDEV(TTY_MAJOR, 0), NULL,
3082                                             vt_dev_groups, "tty0");
3083         if (IS_ERR(tty0dev))
3084                 tty0dev = NULL;
3085
3086         vcs_init();
3087
3088         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3089         if (!console_driver)
3090                 panic("Couldn't allocate console driver\n");
3091
3092         console_driver->name = "tty";
3093         console_driver->name_base = 1;
3094         console_driver->major = TTY_MAJOR;
3095         console_driver->minor_start = 1;
3096         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3097         console_driver->init_termios = tty_std_termios;
3098         if (default_utf8)
3099                 console_driver->init_termios.c_iflag |= IUTF8;
3100         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3101         tty_set_operations(console_driver, &con_ops);
3102         if (tty_register_driver(console_driver))
3103                 panic("Couldn't register console driver\n");
3104         kbd_init();
3105         console_map_init();
3106 #ifdef CONFIG_MDA_CONSOLE
3107         mda_console_init();
3108 #endif
3109         return 0;
3110 }
3111
3112 #ifndef VT_SINGLE_DRIVER
3113
3114 static struct class *vtconsole_class;
3115
3116 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3117                            int deflt)
3118 {
3119         struct module *owner = csw->owner;
3120         const char *desc = NULL;
3121         struct con_driver *con_driver;
3122         int i, j = -1, k = -1, retval = -ENODEV;
3123
3124         if (!try_module_get(owner))
3125                 return -ENODEV;
3126
3127         WARN_CONSOLE_UNLOCKED();
3128
3129         /* check if driver is registered */
3130         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3131                 con_driver = &registered_con_driver[i];
3132
3133                 if (con_driver->con == csw) {
3134                         desc = con_driver->desc;
3135                         retval = 0;
3136                         break;
3137                 }
3138         }
3139
3140         if (retval)
3141                 goto err;
3142
3143         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3144                 csw->con_startup();
3145                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3146         }
3147
3148         if (deflt) {
3149                 if (conswitchp)
3150                         module_put(conswitchp->owner);
3151
3152                 __module_get(owner);
3153                 conswitchp = csw;
3154         }
3155
3156         first = max(first, con_driver->first);
3157         last = min(last, con_driver->last);
3158
3159         for (i = first; i <= last; i++) {
3160                 int old_was_color;
3161                 struct vc_data *vc = vc_cons[i].d;
3162
3163                 if (con_driver_map[i])
3164                         module_put(con_driver_map[i]->owner);
3165                 __module_get(owner);
3166                 con_driver_map[i] = csw;
3167
3168                 if (!vc || !vc->vc_sw)
3169                         continue;
3170
3171                 j = i;
3172
3173                 if (con_is_visible(vc)) {
3174                         k = i;
3175                         save_screen(vc);
3176                 }
3177
3178                 old_was_color = vc->vc_can_do_color;
3179                 vc->vc_sw->con_deinit(vc);
3180                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3181                 visual_init(vc, i, 0);
3182                 set_origin(vc);
3183                 update_attr(vc);
3184
3185                 /* If the console changed between mono <-> color, then
3186                  * the attributes in the screenbuf will be wrong.  The
3187                  * following resets all attributes to something sane.
3188                  */
3189                 if (old_was_color != vc->vc_can_do_color)
3190                         clear_buffer_attributes(vc);
3191         }
3192
3193         pr_info("Console: switching ");
3194         if (!deflt)
3195                 pr_cont("consoles %d-%d ", first + 1, last + 1);
3196         if (j >= 0) {
3197                 struct vc_data *vc = vc_cons[j].d;
3198
3199                 pr_cont("to %s %s %dx%d\n",
3200                         vc->vc_can_do_color ? "colour" : "mono",
3201                         desc, vc->vc_cols, vc->vc_rows);
3202
3203                 if (k >= 0) {
3204                         vc = vc_cons[k].d;
3205                         update_screen(vc);
3206                 }
3207         } else {
3208                 pr_cont("to %s\n", desc);
3209         }
3210
3211         retval = 0;
3212 err:
3213         module_put(owner);
3214         return retval;
3215 };
3216
3217
3218 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3219 /* unlocked version of unbind_con_driver() */
3220 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3221 {
3222         struct module *owner = csw->owner;
3223         const struct consw *defcsw = NULL;
3224         struct con_driver *con_driver = NULL, *con_back = NULL;
3225         int i, retval = -ENODEV;
3226
3227         if (!try_module_get(owner))
3228                 return -ENODEV;
3229
3230         WARN_CONSOLE_UNLOCKED();
3231
3232         /* check if driver is registered and if it is unbindable */
3233         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3234                 con_driver = &registered_con_driver[i];
3235
3236                 if (con_driver->con == csw &&
3237                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3238                         retval = 0;
3239                         break;
3240                 }
3241         }
3242
3243         if (retval)
3244                 goto err;
3245
3246         retval = -ENODEV;
3247
3248         /* check if backup driver exists */
3249         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3250                 con_back = &registered_con_driver[i];
3251
3252                 if (con_back->con && con_back->con != csw) {
3253                         defcsw = con_back->con;
3254                         retval = 0;
3255                         break;
3256                 }
3257         }
3258
3259         if (retval)
3260                 goto err;
3261
3262         if (!con_is_bound(csw))
3263                 goto err;
3264
3265         first = max(first, con_driver->first);
3266         last = min(last, con_driver->last);
3267
3268         for (i = first; i <= last; i++) {
3269                 if (con_driver_map[i] == csw) {
3270                         module_put(csw->owner);
3271                         con_driver_map[i] = NULL;
3272                 }
3273         }
3274
3275         if (!con_is_bound(defcsw)) {
3276                 const struct consw *defconsw = conswitchp;
3277
3278                 defcsw->con_startup();
3279                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3280                 /*
3281                  * vgacon may change the default driver to point
3282                  * to dummycon, we restore it here...
3283                  */
3284                 conswitchp = defconsw;
3285         }
3286
3287         if (!con_is_bound(csw))
3288                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3289
3290         /* ignore return value, binding should not fail */
3291         do_bind_con_driver(defcsw, first, last, deflt);
3292 err:
3293         module_put(owner);
3294         return retval;
3295
3296 }
3297 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3298
3299 static int vt_bind(struct con_driver *con)
3300 {
3301         const struct consw *defcsw = NULL, *csw = NULL;
3302         int i, more = 1, first = -1, last = -1, deflt = 0;
3303
3304         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3305                 goto err;
3306
3307         csw = con->con;
3308
3309         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3310                 struct con_driver *con = &registered_con_driver[i];
3311
3312                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3313                         defcsw = con->con;
3314                         break;
3315                 }
3316         }
3317
3318         if (!defcsw)
3319                 goto err;
3320
3321         while (more) {
3322                 more = 0;
3323
3324                 for (i = con->first; i <= con->last; i++) {
3325                         if (con_driver_map[i] == defcsw) {
3326                                 if (first == -1)
3327                                         first = i;
3328                                 last = i;
3329                                 more = 1;
3330                         } else if (first != -1)
3331                                 break;
3332                 }
3333
3334                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3335                         deflt = 1;
3336
3337                 if (first != -1)
3338                         do_bind_con_driver(csw, first, last, deflt);
3339
3340                 first = -1;
3341                 last = -1;
3342                 deflt = 0;
3343         }
3344
3345 err:
3346         return 0;
3347 }
3348
3349 static int vt_unbind(struct con_driver *con)
3350 {
3351         const struct consw *csw = NULL;
3352         int i, more = 1, first = -1, last = -1, deflt = 0;
3353         int ret;
3354
3355         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3356                 goto err;
3357
3358         csw = con->con;
3359
3360         while (more) {
3361                 more = 0;
3362
3363                 for (i = con->first; i <= con->last; i++) {
3364                         if (con_driver_map[i] == csw) {
3365                                 if (first == -1)
3366                                         first = i;
3367                                 last = i;
3368                                 more = 1;
3369                         } else if (first != -1)
3370                                 break;
3371                 }
3372
3373                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3374                         deflt = 1;
3375
3376                 if (first != -1) {
3377                         ret = do_unbind_con_driver(csw, first, last, deflt);
3378                         if (ret != 0)
3379                                 return ret;
3380                 }
3381
3382                 first = -1;
3383                 last = -1;
3384                 deflt = 0;
3385         }
3386
3387 err:
3388         return 0;
3389 }
3390 #else
3391 static inline int vt_bind(struct con_driver *con)
3392 {
3393         return 0;
3394 }
3395 static inline int vt_unbind(struct con_driver *con)
3396 {
3397         return 0;
3398 }
3399 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3400
3401 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3402                           const char *buf, size_t count)
3403 {
3404         struct con_driver *con = dev_get_drvdata(dev);
3405         int bind = simple_strtoul(buf, NULL, 0);
3406
3407         console_lock();
3408
3409         if (bind)
3410                 vt_bind(con);
3411         else
3412                 vt_unbind(con);
3413
3414         console_unlock();
3415
3416         return count;
3417 }
3418
3419 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3420                          char *buf)
3421 {
3422         struct con_driver *con = dev_get_drvdata(dev);
3423         int bind = con_is_bound(con->con);
3424
3425         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3426 }
3427
3428 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3429                          char *buf)
3430 {
3431         struct con_driver *con = dev_get_drvdata(dev);
3432
3433         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3434                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3435                          con->desc);
3436
3437 }
3438
3439 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3440 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3441
3442 static struct attribute *con_dev_attrs[] = {
3443         &dev_attr_bind.attr,
3444         &dev_attr_name.attr,
3445         NULL
3446 };
3447
3448 ATTRIBUTE_GROUPS(con_dev);
3449
3450 static int vtconsole_init_device(struct con_driver *con)
3451 {
3452         con->flag |= CON_DRIVER_FLAG_ATTR;
3453         return 0;
3454 }
3455
3456 static void vtconsole_deinit_device(struct con_driver *con)
3457 {
3458         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3459 }
3460
3461 /**
3462  * con_is_bound - checks if driver is bound to the console
3463  * @csw: console driver
3464  *
3465  * RETURNS: zero if unbound, nonzero if bound
3466  *
3467  * Drivers can call this and if zero, they should release
3468  * all resources allocated on con_startup()
3469  */
3470 int con_is_bound(const struct consw *csw)
3471 {
3472         int i, bound = 0;
3473
3474         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3475                 if (con_driver_map[i] == csw) {
3476                         bound = 1;
3477                         break;
3478                 }
3479         }
3480
3481         return bound;
3482 }
3483 EXPORT_SYMBOL(con_is_bound);
3484
3485 /**
3486  * con_debug_enter - prepare the console for the kernel debugger
3487  * @sw: console driver
3488  *
3489  * Called when the console is taken over by the kernel debugger, this
3490  * function needs to save the current console state, then put the console
3491  * into a state suitable for the kernel debugger.
3492  *
3493  * RETURNS:
3494  * Zero on success, nonzero if a failure occurred when trying to prepare
3495  * the console for the debugger.
3496  */
3497 int con_debug_enter(struct vc_data *vc)
3498 {
3499         int ret = 0;
3500
3501         saved_fg_console = fg_console;
3502         saved_last_console = last_console;
3503         saved_want_console = want_console;
3504         saved_vc_mode = vc->vc_mode;
3505         saved_console_blanked = console_blanked;
3506         vc->vc_mode = KD_TEXT;
3507         console_blanked = 0;
3508         if (vc->vc_sw->con_debug_enter)
3509                 ret = vc->vc_sw->con_debug_enter(vc);
3510 #ifdef CONFIG_KGDB_KDB
3511         /* Set the initial LINES variable if it is not already set */
3512         if (vc->vc_rows < 999) {
3513                 int linecount;
3514                 char lns[4];
3515                 const char *setargs[3] = {
3516                         "set",
3517                         "LINES",
3518                         lns,
3519                 };
3520                 if (kdbgetintenv(setargs[0], &linecount)) {
3521                         snprintf(lns, 4, "%i", vc->vc_rows);
3522                         kdb_set(2, setargs);
3523                 }
3524         }
3525         if (vc->vc_cols < 999) {
3526                 int colcount;
3527                 char cols[4];
3528                 const char *setargs[3] = {
3529                         "set",
3530                         "COLUMNS",
3531                         cols,
3532                 };
3533                 if (kdbgetintenv(setargs[0], &colcount)) {
3534                         snprintf(cols, 4, "%i", vc->vc_cols);
3535                         kdb_set(2, setargs);
3536                 }
3537         }
3538 #endif /* CONFIG_KGDB_KDB */
3539         return ret;
3540 }
3541 EXPORT_SYMBOL_GPL(con_debug_enter);
3542
3543 /**
3544  * con_debug_leave - restore console state
3545  * @sw: console driver
3546  *
3547  * Restore the console state to what it was before the kernel debugger
3548  * was invoked.
3549  *
3550  * RETURNS:
3551  * Zero on success, nonzero if a failure occurred when trying to restore
3552  * the console.
3553  */
3554 int con_debug_leave(void)
3555 {
3556         struct vc_data *vc;
3557         int ret = 0;
3558
3559         fg_console = saved_fg_console;
3560         last_console = saved_last_console;
3561         want_console = saved_want_console;
3562         console_blanked = saved_console_blanked;
3563         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3564
3565         vc = vc_cons[fg_console].d;
3566         if (vc->vc_sw->con_debug_leave)
3567                 ret = vc->vc_sw->con_debug_leave(vc);
3568         return ret;
3569 }
3570 EXPORT_SYMBOL_GPL(con_debug_leave);
3571
3572 static int do_register_con_driver(const struct consw *csw, int first, int last)
3573 {
3574         struct module *owner = csw->owner;
3575         struct con_driver *con_driver;
3576         const char *desc;
3577         int i, retval;
3578
3579         WARN_CONSOLE_UNLOCKED();
3580
3581         if (!try_module_get(owner))
3582                 return -ENODEV;
3583
3584         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3585                 con_driver = &registered_con_driver[i];
3586
3587                 /* already registered */
3588                 if (con_driver->con == csw) {
3589                         retval = -EBUSY;
3590                         goto err;
3591                 }
3592         }
3593
3594         desc = csw->con_startup();
3595         if (!desc) {
3596                 retval = -ENODEV;
3597                 goto err;
3598         }
3599
3600         retval = -EINVAL;
3601
3602         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3603                 con_driver = &registered_con_driver[i];
3604
3605                 if (con_driver->con == NULL &&
3606                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3607                         con_driver->con = csw;
3608                         con_driver->desc = desc;
3609                         con_driver->node = i;
3610                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3611                                            CON_DRIVER_FLAG_INIT;
3612                         con_driver->first = first;
3613                         con_driver->last = last;
3614                         retval = 0;
3615                         break;
3616                 }
3617         }
3618
3619         if (retval)
3620                 goto err;
3621
3622         con_driver->dev =
3623                 device_create_with_groups(vtconsole_class, NULL,
3624                                           MKDEV(0, con_driver->node),
3625                                           con_driver, con_dev_groups,
3626                                           "vtcon%i", con_driver->node);
3627         if (IS_ERR(con_driver->dev)) {
3628                 pr_warn("Unable to create device for %s; errno = %ld\n",
3629                         con_driver->desc, PTR_ERR(con_driver->dev));
3630                 con_driver->dev = NULL;
3631         } else {
3632                 vtconsole_init_device(con_driver);
3633         }
3634
3635 err:
3636         module_put(owner);
3637         return retval;
3638 }
3639
3640
3641 /**
3642  * do_unregister_con_driver - unregister console driver from console layer
3643  * @csw: console driver
3644  *
3645  * DESCRIPTION: All drivers that registers to the console layer must
3646  * call this function upon exit, or if the console driver is in a state
3647  * where it won't be able to handle console services, such as the
3648  * framebuffer console without loaded framebuffer drivers.
3649  *
3650  * The driver must unbind first prior to unregistration.
3651  */
3652 int do_unregister_con_driver(const struct consw *csw)
3653 {
3654         int i;
3655
3656         /* cannot unregister a bound driver */
3657         if (con_is_bound(csw))
3658                 return -EBUSY;
3659
3660         if (csw == conswitchp)
3661                 return -EINVAL;
3662
3663         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3664                 struct con_driver *con_driver = &registered_con_driver[i];
3665
3666                 if (con_driver->con == csw) {
3667                         /*
3668                          * Defer the removal of the sysfs entries since that
3669                          * will acquire the kernfs s_active lock and we can't
3670                          * acquire this lock while holding the console lock:
3671                          * the unbind sysfs entry imposes already the opposite
3672                          * order. Reset con already here to prevent any later
3673                          * lookup to succeed and mark this slot as zombie, so
3674                          * it won't get reused until we complete the removal
3675                          * in the deferred work.
3676                          */
3677                         con_driver->con = NULL;
3678                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3679                         schedule_work(&con_driver_unregister_work);
3680
3681                         return 0;
3682                 }
3683         }
3684
3685         return -ENODEV;
3686 }
3687 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3688
3689 static void con_driver_unregister_callback(struct work_struct *ignored)
3690 {
3691         int i;
3692
3693         console_lock();
3694
3695         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3696                 struct con_driver *con_driver = &registered_con_driver[i];
3697
3698                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3699                         continue;
3700
3701                 console_unlock();
3702
3703                 vtconsole_deinit_device(con_driver);
3704                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3705
3706                 console_lock();
3707
3708                 if (WARN_ON_ONCE(con_driver->con))
3709                         con_driver->con = NULL;
3710                 con_driver->desc = NULL;
3711                 con_driver->dev = NULL;
3712                 con_driver->node = 0;
3713                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3714                 con_driver->flag = 0;
3715                 con_driver->first = 0;
3716                 con_driver->last = 0;
3717         }
3718
3719         console_unlock();
3720 }
3721
3722 /*
3723  *      If we support more console drivers, this function is used
3724  *      when a driver wants to take over some existing consoles
3725  *      and become default driver for newly opened ones.
3726  *
3727  *      do_take_over_console is basically a register followed by unbind
3728  */
3729 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3730 {
3731         int err;
3732
3733         err = do_register_con_driver(csw, first, last);
3734         /*
3735          * If we get an busy error we still want to bind the console driver
3736          * and return success, as we may have unbound the console driver
3737          * but not unregistered it.
3738          */
3739         if (err == -EBUSY)
3740                 err = 0;
3741         if (!err)
3742                 do_bind_con_driver(csw, first, last, deflt);
3743
3744         return err;
3745 }
3746 EXPORT_SYMBOL_GPL(do_take_over_console);
3747
3748
3749 /*
3750  * give_up_console is a wrapper to unregister_con_driver. It will only
3751  * work if driver is fully unbound.
3752  */
3753 void give_up_console(const struct consw *csw)
3754 {
3755         console_lock();
3756         do_unregister_con_driver(csw);
3757         console_unlock();
3758 }
3759
3760 static int __init vtconsole_class_init(void)
3761 {
3762         int i;
3763
3764         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3765         if (IS_ERR(vtconsole_class)) {
3766                 pr_warn("Unable to create vt console class; errno = %ld\n",
3767                         PTR_ERR(vtconsole_class));
3768                 vtconsole_class = NULL;
3769         }
3770
3771         /* Add system drivers to sysfs */
3772         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3773                 struct con_driver *con = &registered_con_driver[i];
3774
3775                 if (con->con && !con->dev) {
3776                         con->dev =
3777                                 device_create_with_groups(vtconsole_class, NULL,
3778                                                           MKDEV(0, con->node),
3779                                                           con, con_dev_groups,
3780                                                           "vtcon%i", con->node);
3781
3782                         if (IS_ERR(con->dev)) {
3783                                 pr_warn("Unable to create device for %s; errno = %ld\n",
3784                                         con->desc, PTR_ERR(con->dev));
3785                                 con->dev = NULL;
3786                         } else {
3787                                 vtconsole_init_device(con);
3788                         }
3789                 }
3790         }
3791
3792         return 0;
3793 }
3794 postcore_initcall(vtconsole_class_init);
3795
3796 #endif
3797
3798 /*
3799  *      Screen blanking
3800  */
3801
3802 static int set_vesa_blanking(char __user *p)
3803 {
3804         unsigned int mode;
3805
3806         if (get_user(mode, p + 1))
3807                 return -EFAULT;
3808
3809         vesa_blank_mode = (mode < 4) ? mode : 0;
3810         return 0;
3811 }
3812
3813 void do_blank_screen(int entering_gfx)
3814 {
3815         struct vc_data *vc = vc_cons[fg_console].d;
3816         int i;
3817
3818         WARN_CONSOLE_UNLOCKED();
3819
3820         if (console_blanked) {
3821                 if (blank_state == blank_vesa_wait) {
3822                         blank_state = blank_off;
3823                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3824                 }
3825                 return;
3826         }
3827
3828         /* entering graphics mode? */
3829         if (entering_gfx) {
3830                 hide_cursor(vc);
3831                 save_screen(vc);
3832                 vc->vc_sw->con_blank(vc, -1, 1);
3833                 console_blanked = fg_console + 1;
3834                 blank_state = blank_off;
3835                 set_origin(vc);
3836                 return;
3837         }
3838
3839         if (blank_state != blank_normal_wait)
3840                 return;
3841         blank_state = blank_off;
3842
3843         /* don't blank graphics */
3844         if (vc->vc_mode != KD_TEXT) {
3845                 console_blanked = fg_console + 1;
3846                 return;
3847         }
3848
3849         hide_cursor(vc);
3850         del_timer_sync(&console_timer);
3851         blank_timer_expired = 0;
3852
3853         save_screen(vc);
3854         /* In case we need to reset origin, blanking hook returns 1 */
3855         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3856         console_blanked = fg_console + 1;
3857         if (i)
3858                 set_origin(vc);
3859
3860         if (console_blank_hook && console_blank_hook(1))
3861                 return;
3862
3863         if (vesa_off_interval && vesa_blank_mode) {
3864                 blank_state = blank_vesa_wait;
3865                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3866         }
3867         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3868 }
3869 EXPORT_SYMBOL(do_blank_screen);
3870
3871 /*
3872  * Called by timer as well as from vt_console_driver
3873  */
3874 void do_unblank_screen(int leaving_gfx)
3875 {
3876         struct vc_data *vc;
3877
3878         /* This should now always be called from a "sane" (read: can schedule)
3879          * context for the sake of the low level drivers, except in the special
3880          * case of oops_in_progress
3881          */
3882         if (!oops_in_progress)
3883                 might_sleep();
3884
3885         WARN_CONSOLE_UNLOCKED();
3886
3887         ignore_poke = 0;
3888         if (!console_blanked)
3889                 return;
3890         if (!vc_cons_allocated(fg_console)) {
3891                 /* impossible */
3892                 pr_warn("unblank_screen: tty %d not allocated ??\n",
3893                         fg_console + 1);
3894                 return;
3895         }
3896         vc = vc_cons[fg_console].d;
3897         /* Try to unblank in oops case too */
3898         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3899                 return; /* but leave console_blanked != 0 */
3900
3901         if (blankinterval) {
3902                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3903                 blank_state = blank_normal_wait;
3904         }
3905
3906         console_blanked = 0;
3907         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3908                 /* Low-level driver cannot restore -> do it ourselves */
3909                 update_screen(vc);
3910         if (console_blank_hook)
3911                 console_blank_hook(0);
3912         set_palette(vc);
3913         set_cursor(vc);
3914         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3915 }
3916 EXPORT_SYMBOL(do_unblank_screen);
3917
3918 /*
3919  * This is called by the outside world to cause a forced unblank, mostly for
3920  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3921  * call it with 1 as an argument and so force a mode restore... that may kill
3922  * X or at least garbage the screen but would also make the Oops visible...
3923  */
3924 void unblank_screen(void)
3925 {
3926         do_unblank_screen(0);
3927 }
3928
3929 /*
3930  * We defer the timer blanking to work queue so it can take the console mutex
3931  * (console operations can still happen at irq time, but only from printk which
3932  * has the console mutex. Not perfect yet, but better than no locking
3933  */
3934 static void blank_screen_t(struct timer_list *unused)
3935 {
3936         blank_timer_expired = 1;
3937         schedule_work(&console_work);
3938 }
3939
3940 void poke_blanked_console(void)
3941 {
3942         WARN_CONSOLE_UNLOCKED();
3943
3944         /* Add this so we quickly catch whoever might call us in a non
3945          * safe context. Nowadays, unblank_screen() isn't to be called in
3946          * atomic contexts and is allowed to schedule (with the special case
3947          * of oops_in_progress, but that isn't of any concern for this
3948          * function. --BenH.
3949          */
3950         might_sleep();
3951
3952         /* This isn't perfectly race free, but a race here would be mostly harmless,
3953          * at worse, we'll do a spurrious blank and it's unlikely
3954          */
3955         del_timer(&console_timer);
3956         blank_timer_expired = 0;
3957
3958         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3959                 return;
3960         if (console_blanked)
3961                 unblank_screen();
3962         else if (blankinterval) {
3963                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3964                 blank_state = blank_normal_wait;
3965         }
3966 }
3967
3968 /*
3969  *      Palettes
3970  */
3971
3972 static void set_palette(struct vc_data *vc)
3973 {
3974         WARN_CONSOLE_UNLOCKED();
3975
3976         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3977                 vc->vc_sw->con_set_palette(vc, color_table);
3978 }
3979
3980 /*
3981  * Load palette into the DAC registers. arg points to a colour
3982  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3983  */
3984
3985 int con_set_cmap(unsigned char __user *arg)
3986 {
3987         int i, j, k;
3988         unsigned char colormap[3*16];
3989
3990         if (copy_from_user(colormap, arg, sizeof(colormap)))
3991                 return -EFAULT;
3992
3993         console_lock();
3994         for (i = k = 0; i < 16; i++) {
3995                 default_red[i] = colormap[k++];
3996                 default_grn[i] = colormap[k++];
3997                 default_blu[i] = colormap[k++];
3998         }
3999         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4000                 if (!vc_cons_allocated(i))
4001                         continue;
4002                 for (j = k = 0; j < 16; j++) {
4003                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4004                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4005                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4006                 }
4007                 set_palette(vc_cons[i].d);
4008         }
4009         console_unlock();
4010
4011         return 0;
4012 }
4013
4014 int con_get_cmap(unsigned char __user *arg)
4015 {
4016         int i, k;
4017         unsigned char colormap[3*16];
4018
4019         console_lock();
4020         for (i = k = 0; i < 16; i++) {
4021                 colormap[k++] = default_red[i];
4022                 colormap[k++] = default_grn[i];
4023                 colormap[k++] = default_blu[i];
4024         }
4025         console_unlock();
4026
4027         if (copy_to_user(arg, colormap, sizeof(colormap)))
4028                 return -EFAULT;
4029
4030         return 0;
4031 }
4032
4033 void reset_palette(struct vc_data *vc)
4034 {
4035         int j, k;
4036         for (j=k=0; j<16; j++) {
4037                 vc->vc_palette[k++] = default_red[j];
4038                 vc->vc_palette[k++] = default_grn[j];
4039                 vc->vc_palette[k++] = default_blu[j];
4040         }
4041         set_palette(vc);
4042 }
4043
4044 /*
4045  *  Font switching
4046  *
4047  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4048  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4049  *  depending on width) reserved for each character which is kinda wasty, but
4050  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4051  *  is up to the actual low-level console-driver convert data into its favorite
4052  *  format (maybe we should add a `fontoffset' field to the `display'
4053  *  structure so we won't have to convert the fontdata all the time.
4054  *  /Jes
4055  */
4056
4057 #define max_font_size 65536
4058
4059 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4060 {
4061         struct console_font font;
4062         int rc = -EINVAL;
4063         int c;
4064
4065         if (op->data) {
4066                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4067                 if (!font.data)
4068                         return -ENOMEM;
4069         } else
4070                 font.data = NULL;
4071
4072         console_lock();
4073         if (vc->vc_mode != KD_TEXT)
4074                 rc = -EINVAL;
4075         else if (vc->vc_sw->con_font_get)
4076                 rc = vc->vc_sw->con_font_get(vc, &font);
4077         else
4078                 rc = -ENOSYS;
4079         console_unlock();
4080
4081         if (rc)
4082                 goto out;
4083
4084         c = (font.width+7)/8 * 32 * font.charcount;
4085
4086         if (op->data && font.charcount > op->charcount)
4087                 rc = -ENOSPC;
4088         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4089                 if (font.width > op->width || font.height > op->height)
4090                         rc = -ENOSPC;
4091         } else {
4092                 if (font.width != 8)
4093                         rc = -EIO;
4094                 else if ((op->height && font.height > op->height) ||
4095                          font.height > 32)
4096                         rc = -ENOSPC;
4097         }
4098         if (rc)
4099                 goto out;
4100
4101         op->height = font.height;
4102         op->width = font.width;
4103         op->charcount = font.charcount;
4104
4105         if (op->data && copy_to_user(op->data, font.data, c))
4106                 rc = -EFAULT;
4107
4108 out:
4109         kfree(font.data);
4110         return rc;
4111 }
4112
4113 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4114 {
4115         struct console_font font;
4116         int rc = -EINVAL;
4117         int size;
4118
4119         if (vc->vc_mode != KD_TEXT)
4120                 return -EINVAL;
4121         if (!op->data)
4122                 return -EINVAL;
4123         if (op->charcount > 512)
4124                 return -EINVAL;
4125         if (op->width <= 0 || op->width > 32 || op->height > 32)
4126                 return -EINVAL;
4127         size = (op->width+7)/8 * 32 * op->charcount;
4128         if (size > max_font_size)
4129                 return -ENOSPC;
4130
4131         font.data = memdup_user(op->data, size);
4132         if (IS_ERR(font.data))
4133                 return PTR_ERR(font.data);
4134
4135         if (!op->height) {              /* Need to guess font height [compat] */
4136                 int h, i;
4137                 u8 *charmap = font.data;
4138
4139                 /*
4140                  * If from KDFONTOP ioctl, don't allow things which can be done
4141                  * in userland,so that we can get rid of this soon
4142                  */
4143                 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4144                         kfree(font.data);
4145                         return -EINVAL;
4146                 }
4147
4148                 for (h = 32; h > 0; h--)
4149                         for (i = 0; i < op->charcount; i++)
4150                                 if (charmap[32*i+h-1])
4151                                         goto nonzero;
4152
4153                 kfree(font.data);
4154                 return -EINVAL;
4155
4156         nonzero:
4157                 op->height = h;
4158         }
4159
4160         font.charcount = op->charcount;
4161         font.width = op->width;
4162         font.height = op->height;
4163
4164         console_lock();
4165         if (vc->vc_mode != KD_TEXT)
4166                 rc = -EINVAL;
4167         else if (vc->vc_sw->con_font_set)
4168                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4169         else
4170                 rc = -ENOSYS;
4171         console_unlock();
4172         kfree(font.data);
4173         return rc;
4174 }
4175
4176 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4177 {
4178         struct console_font font = {.width = op->width, .height = op->height};
4179         char name[MAX_FONT_NAME];
4180         char *s = name;
4181         int rc;
4182
4183
4184         if (!op->data)
4185                 s = NULL;
4186         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4187                 return -EFAULT;
4188         else
4189                 name[MAX_FONT_NAME - 1] = 0;
4190
4191         console_lock();
4192         if (vc->vc_mode != KD_TEXT) {
4193                 console_unlock();
4194                 return -EINVAL;
4195         }
4196         if (vc->vc_sw->con_font_default)
4197                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4198         else
4199                 rc = -ENOSYS;
4200         console_unlock();
4201         if (!rc) {
4202                 op->width = font.width;
4203                 op->height = font.height;
4204         }
4205         return rc;
4206 }
4207
4208 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4209 {
4210         int con = op->height;
4211         int rc;
4212
4213
4214         console_lock();
4215         if (vc->vc_mode != KD_TEXT)
4216                 rc = -EINVAL;
4217         else if (!vc->vc_sw->con_font_copy)
4218                 rc = -ENOSYS;
4219         else if (con < 0 || !vc_cons_allocated(con))
4220                 rc = -ENOTTY;
4221         else if (con == vc->vc_num)     /* nothing to do */
4222                 rc = 0;
4223         else
4224                 rc = vc->vc_sw->con_font_copy(vc, con);
4225         console_unlock();
4226         return rc;
4227 }
4228
4229 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4230 {
4231         switch (op->op) {
4232         case KD_FONT_OP_SET:
4233                 return con_font_set(vc, op);
4234         case KD_FONT_OP_GET:
4235                 return con_font_get(vc, op);
4236         case KD_FONT_OP_SET_DEFAULT:
4237                 return con_font_default(vc, op);
4238         case KD_FONT_OP_COPY:
4239                 return con_font_copy(vc, op);
4240         }
4241         return -ENOSYS;
4242 }
4243
4244 /*
4245  *      Interface exported to selection and vcs.
4246  */
4247
4248 /* used by selection */
4249 u16 screen_glyph(struct vc_data *vc, int offset)
4250 {
4251         u16 w = scr_readw(screenpos(vc, offset, 1));
4252         u16 c = w & 0xff;
4253
4254         if (w & vc->vc_hi_font_mask)
4255                 c |= 0x100;
4256         return c;
4257 }
4258 EXPORT_SYMBOL_GPL(screen_glyph);
4259
4260 /* used by vcs - note the word offset */
4261 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4262 {
4263         return screenpos(vc, 2 * w_offset, viewed);
4264 }
4265 EXPORT_SYMBOL_GPL(screen_pos);
4266
4267 void getconsxy(struct vc_data *vc, unsigned char *p)
4268 {
4269         p[0] = vc->vc_x;
4270         p[1] = vc->vc_y;
4271 }
4272
4273 void putconsxy(struct vc_data *vc, unsigned char *p)
4274 {
4275         hide_cursor(vc);
4276         gotoxy(vc, p[0], p[1]);
4277         set_cursor(vc);
4278 }
4279
4280 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4281 {
4282         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4283                 return softcursor_original;
4284         return scr_readw(org);
4285 }
4286
4287 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4288 {
4289         scr_writew(val, org);
4290         if ((unsigned long)org == vc->vc_pos) {
4291                 softcursor_original = -1;
4292                 add_softcursor(vc);
4293         }
4294 }
4295
4296 void vcs_scr_updated(struct vc_data *vc)
4297 {
4298         notify_update(vc);
4299 }
4300
4301 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4302                 unsigned int rolled_over, void *base, unsigned int size)
4303 {
4304         unsigned long ubase = (unsigned long)base;
4305         ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4306         ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4307         ptrdiff_t origin = (void *)c->vc_origin - base;
4308         int margin = c->vc_size_row * 4;
4309         int from, wrap, from_off, avail;
4310
4311         /* Turn scrollback off */
4312         if (!lines) {
4313                 c->vc_visible_origin = c->vc_origin;
4314                 return;
4315         }
4316
4317         /* Do we have already enough to allow jumping from 0 to the end? */
4318         if (rolled_over > scr_end + margin) {
4319                 from = scr_end;
4320                 wrap = rolled_over + c->vc_size_row;
4321         } else {
4322                 from = 0;
4323                 wrap = size;
4324         }
4325
4326         from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4327         avail = (origin - from + wrap) % wrap;
4328
4329         /* Only a little piece would be left? Show all incl. the piece! */
4330         if (avail < 2 * margin)
4331                 margin = 0;
4332         if (from_off < margin)
4333                 from_off = 0;
4334         if (from_off > avail - margin)
4335                 from_off = avail;
4336
4337         c->vc_visible_origin = ubase + (from + from_off) % wrap;
4338 }
4339 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4340
4341 /*
4342  *      Visible symbols for modules
4343  */
4344
4345 EXPORT_SYMBOL(color_table);
4346 EXPORT_SYMBOL(default_red);
4347 EXPORT_SYMBOL(default_grn);
4348 EXPORT_SYMBOL(default_blu);
4349 EXPORT_SYMBOL(update_region);
4350 EXPORT_SYMBOL(redraw_screen);
4351 EXPORT_SYMBOL(vc_resize);
4352 EXPORT_SYMBOL(fg_console);
4353 EXPORT_SYMBOL(console_blank_hook);
4354 EXPORT_SYMBOL(console_blanked);
4355 EXPORT_SYMBOL(vc_cons);
4356 EXPORT_SYMBOL(global_cursor_default);
4357 #ifndef VT_SINGLE_DRIVER
4358 EXPORT_SYMBOL(give_up_console);
4359 #endif