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 #include <linux/gcd.h>
 108
 109 #define MAX_NR_CON_DRIVER 16
 110
 111 #define CON_DRIVER_FLAG_MODULE 1
 112 #define CON_DRIVER_FLAG_INIT   2
 113 #define CON_DRIVER_FLAG_ATTR   4
 114 #define CON_DRIVER_FLAG_ZOMBIE 8
 115
 116 struct con_driver {
 117         const struct consw *con;
 118         const char *desc;
 119         struct device *dev;
 120         int node;
 121         int first;
 122         int last;
 123         int flag;
 124 };
 125
 126 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 127 const struct consw *conswitchp;
 128
 129 /* A bitmap for codes <32. A bit of 1 indicates that the code
 130  * corresponding to that bit number invokes some special action
 131  * (such as cursor movement) and should not be displayed as a
 132  * glyph unless the disp_ctrl mode is explicitly enabled.
 133  */
 134 #define CTRL_ACTION 0x0d00ff81
 135 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 136
 137 /*
 138  * Here is the default bell parameters: 750HZ, 1/8th of a second
 139  */
 140 #define DEFAULT_BELL_PITCH      750
 141 #define DEFAULT_BELL_DURATION   (HZ/8)
 142 #define DEFAULT_CURSOR_BLINK_MS 200
 143
 144 struct vc vc_cons [MAX_NR_CONSOLES];
 145
 146 #ifndef VT_SINGLE_DRIVER
 147 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 148 #endif
 149
 150 static int con_open(struct tty_struct *, struct file *);
 151 static void vc_init(struct vc_data *vc, unsigned int rows,
 152                     unsigned int cols, int do_clear);
 153 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 154 static void save_cur(struct vc_data *vc);
 155 static void reset_terminal(struct vc_data *vc, int do_clear);
 156 static void con_flush_chars(struct tty_struct *tty);
 157 static int set_vesa_blanking(char __user *p);
 158 static void set_cursor(struct vc_data *vc);
 159 static void hide_cursor(struct vc_data *vc);
 160 static void console_callback(struct work_struct *ignored);
 161 static void con_driver_unregister_callback(struct work_struct *ignored);
 162 static void blank_screen_t(struct timer_list *unused);
 163 static void set_palette(struct vc_data *vc);
 164
 165 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 166
 167 static int printable;           /* Is console ready for printing? */
 168 int default_utf8 = true;
 169 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 170 int global_cursor_default = -1;
 171 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 172
 173 static int cur_default = CUR_DEFAULT;
 174 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 175
 176 /*
 177  * ignore_poke: don't unblank the screen when things are typed.  This is
 178  * mainly for the privacy of braille terminal users.
 179  */
 180 static int ignore_poke;
 181
 182 int do_poke_blanked_console;
 183 int console_blanked;
 184
 185 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 186 static int vesa_off_interval;
 187 static int blankinterval;
 188 core_param(consoleblank, blankinterval, int, 0444);
 189
 190 static DECLARE_WORK(console_work, console_callback);
 191 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 192
 193 /*
 194  * fg_console is the current virtual console,
 195  * last_console is the last used one,
 196  * want_console is the console we want to switch to,
 197  * saved_* variants are for save/restore around kernel debugger enter/leave
 198  */
 199 int fg_console;
 200 int last_console;
 201 int want_console = -1;
 202 static int saved_fg_console;
 203 static int saved_last_console;
 204 static int saved_want_console;
 205 static int saved_vc_mode;
 206 static int saved_console_blanked;
 207
 208 /*
 209  * For each existing display, we have a pointer to console currently visible
 210  * on that display, allowing consoles other than fg_console to be refreshed
 211  * appropriately. Unless the low-level driver supplies its own display_fg
 212  * variable, we use this one for the "master display".
 213  */
 214 static struct vc_data *master_display_fg;
 215
 216 /*
 217  * Unfortunately, we need to delay tty echo when we're currently writing to the
 218  * console since the code is (and always was) not re-entrant, so we schedule
 219  * all flip requests to process context with schedule-task() and run it from
 220  * console_callback().
 221  */
 222
 223 /*
 224  * For the same reason, we defer scrollback to the console callback.
 225  */
 226 static int scrollback_delta;
 227
 228 /*
 229  * Hook so that the power management routines can (un)blank
 230  * the console on our behalf.
 231  */
 232 int (*console_blank_hook)(int);
 233
 234 static DEFINE_TIMER(console_timer, blank_screen_t);
 235 static int blank_state;
 236 static int blank_timer_expired;
 237 enum {
 238         blank_off = 0,
 239         blank_normal_wait,
 240         blank_vesa_wait,
 241 };
 242
 243 /*
 244  * /sys/class/tty/tty0/
 245  *
 246  * the attribute 'active' contains the name of the current vc
 247  * console and it supports poll() to detect vc switches
 248  */
 249 static struct device *tty0dev;
 250
 251 /*
 252  * Notifier list for console events.
 253  */
 254 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 255
 256 int register_vt_notifier(struct notifier_block *nb)
 257 {
 258         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 259 }
 260 EXPORT_SYMBOL_GPL(register_vt_notifier);
 261
 262 int unregister_vt_notifier(struct notifier_block *nb)
 263 {
 264         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 265 }
 266 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 267
 268 static void notify_write(struct vc_data *vc, unsigned int unicode)
 269 {
 270         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 271         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 272 }
 273
 274 static void notify_update(struct vc_data *vc)
 275 {
 276         struct vt_notifier_param param = { .vc = vc };
 277         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 278 }
 279 /*
 280  *      Low-Level Functions
 281  */
 282
 283 static inline bool con_is_fg(const struct vc_data *vc)
 284 {
 285         return vc->vc_num == fg_console;
 286 }
 287
 288 static inline bool con_should_update(const struct vc_data *vc)
 289 {
 290         return con_is_visible(vc) && !console_blanked;
 291 }
 292
 293 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 294 {
 295         unsigned short *p;
 296
 297         if (!viewed)
 298                 p = (unsigned short *)(vc->vc_origin + offset);
 299         else if (!vc->vc_sw->con_screen_pos)
 300                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 301         else
 302                 p = vc->vc_sw->con_screen_pos(vc, offset);
 303         return p;
 304 }
 305
 306 /* Called  from the keyboard irq path.. */
 307 static inline void scrolldelta(int lines)
 308 {
 309         /* FIXME */
 310         /* scrolldelta needs some kind of consistency lock, but the BKL was
 311            and still is not protecting versus the scheduled back end */
 312         scrollback_delta += lines;
 313         schedule_console_callback();
 314 }
 315
 316 void schedule_console_callback(void)
 317 {
 318         schedule_work(&console_work);
 319 }
 320
 321 /*
 322  * Code to manage unicode-based screen buffers
 323  */
 324
 325 #ifdef NO_VC_UNI_SCREEN
 326 /* this disables and optimizes related code away at compile time */
 327 #define get_vc_uniscr(vc) NULL
 328 #else
 329 #define get_vc_uniscr(vc) vc->vc_uni_screen
 330 #endif
 331
 332 #define VC_UNI_SCREEN_DEBUG 0
 333
 334 typedef uint32_t char32_t;
 335
 336 /*
 337  * Our screen buffer is preceded by an array of line pointers so that
 338  * scrolling only implies some pointer shuffling.
 339  */
 340 struct uni_screen {
 341         char32_t *lines[0];
 342 };
 343
 344 static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
 345 {
 346         struct uni_screen *uniscr;
 347         void *p;
 348         unsigned int memsize, i;
 349
 350         /* allocate everything in one go */
 351         memsize = cols * rows * sizeof(char32_t);
 352         memsize += rows * sizeof(char32_t *);
 353         p = kmalloc(memsize, GFP_KERNEL);
 354         if (!p)
 355                 return NULL;
 356
 357         /* initial line pointers */
 358         uniscr = p;
 359         p = uniscr->lines + rows;
 360         for (i = 0; i < rows; i++) {
 361                 uniscr->lines[i] = p;
 362                 p += cols * sizeof(char32_t);
 363         }
 364         return uniscr;
 365 }
 366
 367 static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
 368 {
 369         kfree(vc->vc_uni_screen);
 370         vc->vc_uni_screen = new_uniscr;
 371 }
 372
 373 static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
 374 {
 375         struct uni_screen *uniscr = get_vc_uniscr(vc);
 376
 377         if (uniscr)
 378                 uniscr->lines[vc->vc_y][vc->vc_x] = uc;
 379 }
 380
 381 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
 382 {
 383         struct uni_screen *uniscr = get_vc_uniscr(vc);
 384
 385         if (uniscr) {
 386                 char32_t *ln = uniscr->lines[vc->vc_y];
 387                 unsigned int x = vc->vc_x, cols = vc->vc_cols;
 388
 389                 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
 390                 memset32(&ln[x], ' ', nr);
 391         }
 392 }
 393
 394 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
 395 {
 396         struct uni_screen *uniscr = get_vc_uniscr(vc);
 397
 398         if (uniscr) {
 399                 char32_t *ln = uniscr->lines[vc->vc_y];
 400                 unsigned int x = vc->vc_x, cols = vc->vc_cols;
 401
 402                 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
 403                 memset32(&ln[cols - nr], ' ', nr);
 404         }
 405 }
 406
 407 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
 408                                  unsigned int nr)
 409 {
 410         struct uni_screen *uniscr = get_vc_uniscr(vc);
 411
 412         if (uniscr) {
 413                 char32_t *ln = uniscr->lines[vc->vc_y];
 414
 415                 memset32(&ln[x], ' ', nr);
 416         }
 417 }
 418
 419 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
 420                                   unsigned int nr)
 421 {
 422         struct uni_screen *uniscr = get_vc_uniscr(vc);
 423
 424         if (uniscr) {
 425                 unsigned int cols = vc->vc_cols;
 426
 427                 while (nr--)
 428                         memset32(uniscr->lines[y++], ' ', cols);
 429         }
 430 }
 431
 432 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 433                              enum con_scroll dir, unsigned int nr)
 434 {
 435         struct uni_screen *uniscr = get_vc_uniscr(vc);
 436
 437         if (uniscr) {
 438                 unsigned int i, j, k, sz, d, clear;
 439
 440                 sz = b - t;
 441                 clear = b - nr;
 442                 d = nr;
 443                 if (dir == SM_DOWN) {
 444                         clear = t;
 445                         d = sz - nr;
 446                 }
 447                 for (i = 0; i < gcd(d, sz); i++) {
 448                         char32_t *tmp = uniscr->lines[t + i];
 449                         j = i;
 450                         while (1) {
 451                                 k = j + d;
 452                                 if (k >= sz)
 453                                         k -= sz;
 454                                 if (k == i)
 455                                         break;
 456                                 uniscr->lines[t + j] = uniscr->lines[t + k];
 457                                 j = k;
 458                         }
 459                         uniscr->lines[t + j] = tmp;
 460                 }
 461                 vc_uniscr_clear_lines(vc, clear, nr);
 462         }
 463 }
 464
 465 static void vc_uniscr_copy_area(struct uni_screen *dst,
 466                                 unsigned int dst_cols,
 467                                 unsigned int dst_rows,
 468                                 struct uni_screen *src,
 469                                 unsigned int src_cols,
 470                                 unsigned int src_top_row,
 471                                 unsigned int src_bot_row)
 472 {
 473         unsigned int dst_row = 0;
 474
 475         if (!dst)
 476                 return;
 477
 478         while (src_top_row < src_bot_row) {
 479                 char32_t *src_line = src->lines[src_top_row];
 480                 char32_t *dst_line = dst->lines[dst_row];
 481
 482                 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
 483                 if (dst_cols - src_cols)
 484                         memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
 485                 src_top_row++;
 486                 dst_row++;
 487         }
 488         while (dst_row < dst_rows) {
 489                 char32_t *dst_line = dst->lines[dst_row];
 490
 491                 memset32(dst_line, ' ', dst_cols);
 492                 dst_row++;
 493         }
 494 }
 495
 496 /*
 497  * Called from vcs_read() to make sure unicode screen retrieval is possible.
 498  * This will initialize the unicode screen buffer if not already done.
 499  * This returns 0 if OK, or a negative error code otherwise.
 500  * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
 501  */
 502 int vc_uniscr_check(struct vc_data *vc)
 503 {
 504         struct uni_screen *uniscr;
 505         unsigned short *p;
 506         int x, y, mask;
 507
 508         if (__is_defined(NO_VC_UNI_SCREEN))
 509                 return -EOPNOTSUPP;
 510
 511         WARN_CONSOLE_UNLOCKED();
 512
 513         if (!vc->vc_utf)
 514                 return -ENODATA;
 515
 516         if (vc->vc_uni_screen)
 517                 return 0;
 518
 519         uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
 520         if (!uniscr)
 521                 return -ENOMEM;
 522
 523         /*
 524          * Let's populate it initially with (imperfect) reverse translation.
 525          * This is the next best thing we can do short of having it enabled
 526          * from the start even when no users rely on this functionality. True
 527          * unicode content will be available after a complete screen refresh.
 528          */
 529         p = (unsigned short *)vc->vc_origin;
 530         mask = vc->vc_hi_font_mask | 0xff;
 531         for (y = 0; y < vc->vc_rows; y++) {
 532                 char32_t *line = uniscr->lines[y];
 533                 for (x = 0; x < vc->vc_cols; x++) {
 534                         u16 glyph = scr_readw(p++) & mask;
 535                         line[x] = inverse_translate(vc, glyph, true);
 536                 }
 537         }
 538
 539         vc->vc_uni_screen = uniscr;
 540         return 0;
 541 }
 542
 543 /*
 544  * Called from vcs_read() to get the unicode data from the screen.
 545  * This must be preceded by a successful call to vc_uniscr_check() once
 546  * the console lock has been taken.
 547  */
 548 void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
 549                          unsigned int row, unsigned int col, unsigned int nr)
 550 {
 551         struct uni_screen *uniscr = get_vc_uniscr(vc);
 552         int offset = row * vc->vc_size_row + col * 2;
 553         unsigned long pos;
 554
 555         BUG_ON(!uniscr);
 556
 557         pos = (unsigned long)screenpos(vc, offset, viewed);
 558         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
 559                 /*
 560                  * Desired position falls in the main screen buffer.
 561                  * However the actual row/col might be different if
 562                  * scrollback is active.
 563                  */
 564                 row = (pos - vc->vc_origin) / vc->vc_size_row;
 565                 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
 566                 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
 567         } else {
 568                 /*
 569                  * Scrollback is active. For now let's simply backtranslate
 570                  * the screen glyphs until the unicode screen buffer does
 571                  * synchronize with console display drivers for a scrollback
 572                  * buffer of its own.
 573                  */
 574                 u16 *p = (u16 *)pos;
 575                 int mask = vc->vc_hi_font_mask | 0xff;
 576                 char32_t *uni_buf = dest;
 577                 while (nr--) {
 578                         u16 glyph = scr_readw(p++) & mask;
 579                         *uni_buf++ = inverse_translate(vc, glyph, true);
 580                 }
 581         }
 582 }
 583
 584 /* this is for validation and debugging only */
 585 static void vc_uniscr_debug_check(struct vc_data *vc)
 586 {
 587         struct uni_screen *uniscr = get_vc_uniscr(vc);
 588         unsigned short *p;
 589         int x, y, mask;
 590
 591         if (!VC_UNI_SCREEN_DEBUG || !uniscr)
 592                 return;
 593
 594         WARN_CONSOLE_UNLOCKED();
 595
 596         /*
 597          * Make sure our unicode screen translates into the same glyphs
 598          * as the actual screen. This is brutal indeed.
 599          */
 600         p = (unsigned short *)vc->vc_origin;
 601         mask = vc->vc_hi_font_mask | 0xff;
 602         for (y = 0; y < vc->vc_rows; y++) {
 603                 char32_t *line = uniscr->lines[y];
 604                 for (x = 0; x < vc->vc_cols; x++) {
 605                         u16 glyph = scr_readw(p++) & mask;
 606                         char32_t uc = line[x];
 607                         int tc = conv_uni_to_pc(vc, uc);
 608                         if (tc == -4)
 609                                 tc = conv_uni_to_pc(vc, 0xfffd);
 610                         if (tc == -4)
 611                                 tc = conv_uni_to_pc(vc, '?');
 612                         if (tc != glyph)
 613                                 pr_err_ratelimited(
 614                                         "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
 615                                         __func__, x, y, glyph, tc);
 616                 }
 617         }
 618 }
 619
 620
 621 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 622                 enum con_scroll dir, unsigned int nr)
 623 {
 624         u16 *clear, *d, *s;
 625
 626         if (t + nr >= b)
 627                 nr = b - t - 1;
 628         if (b > vc->vc_rows || t >= b || nr < 1)
 629                 return;
 630         vc_uniscr_scroll(vc, t, b, dir, nr);
 631         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
 632                 return;
 633
 634         s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
 635         d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 636
 637         if (dir == SM_UP) {
 638                 clear = s + (b - t - nr) * vc->vc_cols;
 639                 swap(s, d);
 640         }
 641         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 642         scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
 643 }
 644
 645 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 646 {
 647         unsigned int xx, yy, offset;
 648         u16 *p;
 649
 650         p = (u16 *) start;
 651         if (!vc->vc_sw->con_getxy) {
 652                 offset = (start - vc->vc_origin) / 2;
 653                 xx = offset % vc->vc_cols;
 654                 yy = offset / vc->vc_cols;
 655         } else {
 656                 int nxx, nyy;
 657                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 658                 xx = nxx; yy = nyy;
 659         }
 660         for(;;) {
 661                 u16 attrib = scr_readw(p) & 0xff00;
 662                 int startx = xx;
 663                 u16 *q = p;
 664                 while (xx < vc->vc_cols && count) {
 665                         if (attrib != (scr_readw(p) & 0xff00)) {
 666                                 if (p > q)
 667                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 668                                 startx = xx;
 669                                 q = p;
 670                                 attrib = scr_readw(p) & 0xff00;
 671                         }
 672                         p++;
 673                         xx++;
 674                         count--;
 675                 }
 676                 if (p > q)
 677                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 678                 if (!count)
 679                         break;
 680                 xx = 0;
 681                 yy++;
 682                 if (vc->vc_sw->con_getxy) {
 683                         p = (u16 *)start;
 684                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 685                 }
 686         }
 687 }
 688
 689 void update_region(struct vc_data *vc, unsigned long start, int count)
 690 {
 691         WARN_CONSOLE_UNLOCKED();
 692
 693         if (con_should_update(vc)) {
 694                 hide_cursor(vc);
 695                 do_update_region(vc, start, count);
 696                 set_cursor(vc);
 697         }
 698 }
 699
 700 /* Structure of attributes is hardware-dependent */
 701
 702 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 703     u8 _underline, u8 _reverse, u8 _italic)
 704 {
 705         if (vc->vc_sw->con_build_attr)
 706                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 707                        _blink, _underline, _reverse, _italic);
 708
 709 /*
 710  * ++roman: I completely changed the attribute format for monochrome
 711  * mode (!can_do_color). The formerly used MDA (monochrome display
 712  * adapter) format didn't allow the combination of certain effects.
 713  * Now the attribute is just a bit vector:
 714  *  Bit 0..1: intensity (0..2)
 715  *  Bit 2   : underline
 716  *  Bit 3   : reverse
 717  *  Bit 7   : blink
 718  */
 719         {
 720         u8 a = _color;
 721         if (!vc->vc_can_do_color)
 722                 return _intensity |
 723                        (_italic ? 2 : 0) |
 724                        (_underline ? 4 : 0) |
 725                        (_reverse ? 8 : 0) |
 726                        (_blink ? 0x80 : 0);
 727         if (_italic)
 728                 a = (a & 0xF0) | vc->vc_itcolor;
 729         else if (_underline)
 730                 a = (a & 0xf0) | vc->vc_ulcolor;
 731         else if (_intensity == 0)
 732                 a = (a & 0xf0) | vc->vc_halfcolor;
 733         if (_reverse)
 734                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 735         if (_blink)
 736                 a ^= 0x80;
 737         if (_intensity == 2)
 738                 a ^= 0x08;
 739         if (vc->vc_hi_font_mask == 0x100)
 740                 a <<= 1;
 741         return a;
 742         }
 743 }
 744
 745 static void update_attr(struct vc_data *vc)
 746 {
 747         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 748                       vc->vc_blink, vc->vc_underline,
 749                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 750         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 751 }
 752
 753 /* Note: inverting the screen twice should revert to the original state */
 754 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 755 {
 756         unsigned short *p;
 757
 758         WARN_CONSOLE_UNLOCKED();
 759
 760         count /= 2;
 761         p = screenpos(vc, offset, viewed);
 762         if (vc->vc_sw->con_invert_region) {
 763                 vc->vc_sw->con_invert_region(vc, p, count);
 764         } else {
 765                 u16 *q = p;
 766                 int cnt = count;
 767                 u16 a;
 768
 769                 if (!vc->vc_can_do_color) {
 770                         while (cnt--) {
 771                             a = scr_readw(q);
 772                             a ^= 0x0800;
 773                             scr_writew(a, q);
 774                             q++;
 775                         }
 776                 } else if (vc->vc_hi_font_mask == 0x100) {
 777                         while (cnt--) {
 778                                 a = scr_readw(q);
 779                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 780                                 scr_writew(a, q);
 781                                 q++;
 782                         }
 783                 } else {
 784                         while (cnt--) {
 785                                 a = scr_readw(q);
 786                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 787                                 scr_writew(a, q);
 788                                 q++;
 789                         }
 790                 }
 791         }
 792
 793         if (con_should_update(vc))
 794                 do_update_region(vc, (unsigned long) p, count);
 795         notify_update(vc);
 796 }
 797
 798 /* used by selection: complement pointer position */
 799 void complement_pos(struct vc_data *vc, int offset)
 800 {
 801         static int old_offset = -1;
 802         static unsigned short old;
 803         static unsigned short oldx, oldy;
 804
 805         WARN_CONSOLE_UNLOCKED();
 806
 807         if (old_offset != -1 && old_offset >= 0 &&
 808             old_offset < vc->vc_screenbuf_size) {
 809                 scr_writew(old, screenpos(vc, old_offset, 1));
 810                 if (con_should_update(vc))
 811                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 812                 notify_update(vc);
 813         }
 814
 815         old_offset = offset;
 816
 817         if (offset != -1 && offset >= 0 &&
 818             offset < vc->vc_screenbuf_size) {
 819                 unsigned short new;
 820                 unsigned short *p;
 821                 p = screenpos(vc, offset, 1);
 822                 old = scr_readw(p);
 823                 new = old ^ vc->vc_complement_mask;
 824                 scr_writew(new, p);
 825                 if (con_should_update(vc)) {
 826                         oldx = (offset >> 1) % vc->vc_cols;
 827                         oldy = (offset >> 1) / vc->vc_cols;
 828                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 829                 }
 830                 notify_update(vc);
 831         }
 832 }
 833
 834 static void insert_char(struct vc_data *vc, unsigned int nr)
 835 {
 836         unsigned short *p = (unsigned short *) vc->vc_pos;
 837
 838         vc_uniscr_insert(vc, nr);
 839         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 840         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 841         vc->vc_need_wrap = 0;
 842         if (con_should_update(vc))
 843                 do_update_region(vc, (unsigned long) p,
 844                         vc->vc_cols - vc->vc_x);
 845 }
 846
 847 static void delete_char(struct vc_data *vc, unsigned int nr)
 848 {
 849         unsigned short *p = (unsigned short *) vc->vc_pos;
 850
 851         vc_uniscr_delete(vc, nr);
 852         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 853         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 854                         nr * 2);
 855         vc->vc_need_wrap = 0;
 856         if (con_should_update(vc))
 857                 do_update_region(vc, (unsigned long) p,
 858                         vc->vc_cols - vc->vc_x);
 859 }
 860
 861 static int softcursor_original = -1;
 862
 863 static void add_softcursor(struct vc_data *vc)
 864 {
 865         int i = scr_readw((u16 *) vc->vc_pos);
 866         u32 type = vc->vc_cursor_type;
 867
 868         if (! (type & 0x10)) return;
 869         if (softcursor_original != -1) return;
 870         softcursor_original = i;
 871         i |= ((type >> 8) & 0xff00 );
 872         i ^= ((type) & 0xff00 );
 873         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 874         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 875         scr_writew(i, (u16 *) vc->vc_pos);
 876         if (con_should_update(vc))
 877                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 878 }
 879
 880 static void hide_softcursor(struct vc_data *vc)
 881 {
 882         if (softcursor_original != -1) {
 883                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 884                 if (con_should_update(vc))
 885                         vc->vc_sw->con_putc(vc, softcursor_original,
 886                                         vc->vc_y, vc->vc_x);
 887                 softcursor_original = -1;
 888         }
 889 }
 890
 891 static void hide_cursor(struct vc_data *vc)
 892 {
 893         if (vc == sel_cons)
 894                 clear_selection();
 895         vc->vc_sw->con_cursor(vc, CM_ERASE);
 896         hide_softcursor(vc);
 897 }
 898
 899 static void set_cursor(struct vc_data *vc)
 900 {
 901         if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
 902                 return;
 903         if (vc->vc_deccm) {
 904                 if (vc == sel_cons)
 905                         clear_selection();
 906                 add_softcursor(vc);
 907                 if ((vc->vc_cursor_type & 0x0f) != 1)
 908                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 909         } else
 910                 hide_cursor(vc);
 911 }
 912
 913 static void set_origin(struct vc_data *vc)
 914 {
 915         WARN_CONSOLE_UNLOCKED();
 916
 917         if (!con_is_visible(vc) ||
 918             !vc->vc_sw->con_set_origin ||
 919             !vc->vc_sw->con_set_origin(vc))
 920                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 921         vc->vc_visible_origin = vc->vc_origin;
 922         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 923         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 924 }
 925
 926 static void save_screen(struct vc_data *vc)
 927 {
 928         WARN_CONSOLE_UNLOCKED();
 929
 930         if (vc->vc_sw->con_save_screen)
 931                 vc->vc_sw->con_save_screen(vc);
 932 }
 933
 934 static void flush_scrollback(struct vc_data *vc)
 935 {
 936         WARN_CONSOLE_UNLOCKED();
 937
 938         set_origin(vc);
 939         if (vc->vc_sw->con_flush_scrollback)
 940                 vc->vc_sw->con_flush_scrollback(vc);
 941         else
 942                 vc->vc_sw->con_switch(vc);
 943 }
 944
 945 /*
 946  *      Redrawing of screen
 947  */
 948
 949 void clear_buffer_attributes(struct vc_data *vc)
 950 {
 951         unsigned short *p = (unsigned short *)vc->vc_origin;
 952         int count = vc->vc_screenbuf_size / 2;
 953         int mask = vc->vc_hi_font_mask | 0xff;
 954
 955         for (; count > 0; count--, p++) {
 956                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 957         }
 958 }
 959
 960 void redraw_screen(struct vc_data *vc, int is_switch)
 961 {
 962         int redraw = 0;
 963
 964         WARN_CONSOLE_UNLOCKED();
 965
 966         if (!vc) {
 967                 /* strange ... */
 968                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 969                 return;
 970         }
 971
 972         if (is_switch) {
 973                 struct vc_data *old_vc = vc_cons[fg_console].d;
 974                 if (old_vc == vc)
 975                         return;
 976                 if (!con_is_visible(vc))
 977                         redraw = 1;
 978                 *vc->vc_display_fg = vc;
 979                 fg_console = vc->vc_num;
 980                 hide_cursor(old_vc);
 981                 if (!con_is_visible(old_vc)) {
 982                         save_screen(old_vc);
 983                         set_origin(old_vc);
 984                 }
 985                 if (tty0dev)
 986                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 987         } else {
 988                 hide_cursor(vc);
 989                 redraw = 1;
 990         }
 991
 992         if (redraw) {
 993                 int update;
 994                 int old_was_color = vc->vc_can_do_color;
 995
 996                 set_origin(vc);
 997                 update = vc->vc_sw->con_switch(vc);
 998                 set_palette(vc);
 999                 /*
1000                  * If console changed from mono<->color, the best we can do
1001                  * is to clear the buffer attributes. As it currently stands,
1002                  * rebuilding new attributes from the old buffer is not doable
1003                  * without overly complex code.
1004                  */
1005                 if (old_was_color != vc->vc_can_do_color) {
1006                         update_attr(vc);
1007                         clear_buffer_attributes(vc);
1008                 }
1009
1010                 if (update && vc->vc_mode != KD_GRAPHICS)
1011                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1012         }
1013         set_cursor(vc);
1014         if (is_switch) {
1015                 set_leds();
1016                 compute_shiftstate();
1017                 notify_update(vc);
1018         }
1019 }
1020
1021 /*
1022  *      Allocation, freeing and resizing of VTs.
1023  */
1024
1025 int vc_cons_allocated(unsigned int i)
1026 {
1027         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1028 }
1029
1030 static void visual_init(struct vc_data *vc, int num, int init)
1031 {
1032         /* ++Geert: vc->vc_sw->con_init determines console size */
1033         if (vc->vc_sw)
1034                 module_put(vc->vc_sw->owner);
1035         vc->vc_sw = conswitchp;
1036 #ifndef VT_SINGLE_DRIVER
1037         if (con_driver_map[num])
1038                 vc->vc_sw = con_driver_map[num];
1039 #endif
1040         __module_get(vc->vc_sw->owner);
1041         vc->vc_num = num;
1042         vc->vc_display_fg = &master_display_fg;
1043         if (vc->vc_uni_pagedir_loc)
1044                 con_free_unimap(vc);
1045         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1046         vc->vc_uni_pagedir = NULL;
1047         vc->vc_hi_font_mask = 0;
1048         vc->vc_complement_mask = 0;
1049         vc->vc_can_do_color = 0;
1050         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1051         vc->vc_sw->con_init(vc, init);
1052         if (!vc->vc_complement_mask)
1053                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1054         vc->vc_s_complement_mask = vc->vc_complement_mask;
1055         vc->vc_size_row = vc->vc_cols << 1;
1056         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1057 }
1058
1059
1060 static void visual_deinit(struct vc_data *vc)
1061 {
1062         vc->vc_sw->con_deinit(vc);
1063         module_put(vc->vc_sw->owner);
1064 }
1065
1066 int vc_allocate(unsigned int currcons)  /* return 0 on success */
1067 {
1068         struct vt_notifier_param param;
1069         struct vc_data *vc;
1070
1071         WARN_CONSOLE_UNLOCKED();
1072
1073         if (currcons >= MAX_NR_CONSOLES)
1074                 return -ENXIO;
1075
1076         if (vc_cons[currcons].d)
1077                 return 0;
1078
1079         /* due to the granularity of kmalloc, we waste some memory here */
1080         /* the alloc is done in two steps, to optimize the common situation
1081            of a 25x80 console (structsize=216, screenbuf_size=4000) */
1082         /* although the numbers above are not valid since long ago, the
1083            point is still up-to-date and the comment still has its value
1084            even if only as a historical artifact.  --mj, July 1998 */
1085         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1086         if (!vc)
1087                 return -ENOMEM;
1088
1089         vc_cons[currcons].d = vc;
1090         tty_port_init(&vc->port);
1091         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1092
1093         visual_init(vc, currcons, 1);
1094
1095         if (!*vc->vc_uni_pagedir_loc)
1096                 con_set_default_unimap(vc);
1097
1098         vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1099         if (!vc->vc_screenbuf)
1100                 goto err_free;
1101
1102         /* If no drivers have overridden us and the user didn't pass a
1103            boot option, default to displaying the cursor */
1104         if (global_cursor_default == -1)
1105                 global_cursor_default = 1;
1106
1107         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1108         vcs_make_sysfs(currcons);
1109         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1110
1111         return 0;
1112 err_free:
1113         visual_deinit(vc);
1114         kfree(vc);
1115         vc_cons[currcons].d = NULL;
1116         return -ENOMEM;
1117 }
1118
1119 static inline int resize_screen(struct vc_data *vc, int width, int height,
1120                                 int user)
1121 {
1122         /* Resizes the resolution of the display adapater */
1123         int err = 0;
1124
1125         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1126                 err = vc->vc_sw->con_resize(vc, width, height, user);
1127
1128         return err;
1129 }
1130
1131 /*
1132  * Change # of rows and columns (0 means unchanged/the size of fg_console)
1133  * [this is to be used together with some user program
1134  * like resize that changes the hardware videomode]
1135  */
1136 #define VC_RESIZE_MAXCOL (32767)
1137 #define VC_RESIZE_MAXROW (32767)
1138
1139 /**
1140  *      vc_do_resize    -       resizing method for the tty
1141  *      @tty: tty being resized
1142  *      @real_tty: real tty (different to tty if a pty/tty pair)
1143  *      @vc: virtual console private data
1144  *      @cols: columns
1145  *      @lines: lines
1146  *
1147  *      Resize a virtual console, clipping according to the actual constraints.
1148  *      If the caller passes a tty structure then update the termios winsize
1149  *      information and perform any necessary signal handling.
1150  *
1151  *      Caller must hold the console semaphore. Takes the termios rwsem and
1152  *      ctrl_lock of the tty IFF a tty is passed.
1153  */
1154
1155 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1156                                 unsigned int cols, unsigned int lines)
1157 {
1158         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1159         unsigned long end;
1160         unsigned int old_rows, old_row_size, first_copied_row;
1161         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1162         unsigned int user;
1163         unsigned short *newscreen;
1164         struct uni_screen *new_uniscr = NULL;
1165
1166         WARN_CONSOLE_UNLOCKED();
1167
1168         if (!vc)
1169                 return -ENXIO;
1170
1171         user = vc->vc_resize_user;
1172         vc->vc_resize_user = 0;
1173
1174         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1175                 return -EINVAL;
1176
1177         new_cols = (cols ? cols : vc->vc_cols);
1178         new_rows = (lines ? lines : vc->vc_rows);
1179         new_row_size = new_cols << 1;
1180         new_screen_size = new_row_size * new_rows;
1181
1182         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1183                 return 0;
1184
1185         if (new_screen_size > (4 << 20))
1186                 return -EINVAL;
1187         newscreen = kzalloc(new_screen_size, GFP_USER);
1188         if (!newscreen)
1189                 return -ENOMEM;
1190
1191         if (get_vc_uniscr(vc)) {
1192                 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1193                 if (!new_uniscr) {
1194                         kfree(newscreen);
1195                         return -ENOMEM;
1196                 }
1197         }
1198
1199         if (vc == sel_cons)
1200                 clear_selection();
1201
1202         old_rows = vc->vc_rows;
1203         old_row_size = vc->vc_size_row;
1204
1205         err = resize_screen(vc, new_cols, new_rows, user);
1206         if (err) {
1207                 kfree(newscreen);
1208                 kfree(new_uniscr);
1209                 return err;
1210         }
1211
1212         vc->vc_rows = new_rows;
1213         vc->vc_cols = new_cols;
1214         vc->vc_size_row = new_row_size;
1215         vc->vc_screenbuf_size = new_screen_size;
1216
1217         rlth = min(old_row_size, new_row_size);
1218         rrem = new_row_size - rlth;
1219         old_origin = vc->vc_origin;
1220         new_origin = (long) newscreen;
1221         new_scr_end = new_origin + new_screen_size;
1222
1223         if (vc->vc_y > new_rows) {
1224                 if (old_rows - vc->vc_y < new_rows) {
1225                         /*
1226                          * Cursor near the bottom, copy contents from the
1227                          * bottom of buffer
1228                          */
1229                         first_copied_row = (old_rows - new_rows);
1230                 } else {
1231                         /*
1232                          * Cursor is in no man's land, copy 1/2 screenful
1233                          * from the top and bottom of cursor position
1234                          */
1235                         first_copied_row = (vc->vc_y - new_rows/2);
1236                 }
1237                 old_origin += first_copied_row * old_row_size;
1238         } else
1239                 first_copied_row = 0;
1240         end = old_origin + old_row_size * min(old_rows, new_rows);
1241
1242         vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1243                             get_vc_uniscr(vc), rlth/2, first_copied_row,
1244                             min(old_rows, new_rows));
1245         vc_uniscr_set(vc, new_uniscr);
1246
1247         update_attr(vc);
1248
1249         while (old_origin < end) {
1250                 scr_memcpyw((unsigned short *) new_origin,
1251                             (unsigned short *) old_origin, rlth);
1252                 if (rrem)
1253                         scr_memsetw((void *)(new_origin + rlth),
1254                                     vc->vc_video_erase_char, rrem);
1255                 old_origin += old_row_size;
1256                 new_origin += new_row_size;
1257         }
1258         if (new_scr_end > new_origin)
1259                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1260                             new_scr_end - new_origin);
1261         kfree(vc->vc_screenbuf);
1262         vc->vc_screenbuf = newscreen;
1263         vc->vc_screenbuf_size = new_screen_size;
1264         set_origin(vc);
1265
1266         /* do part of a reset_terminal() */
1267         vc->vc_top = 0;
1268         vc->vc_bottom = vc->vc_rows;
1269         gotoxy(vc, vc->vc_x, vc->vc_y);
1270         save_cur(vc);
1271
1272         if (tty) {
1273                 /* Rewrite the requested winsize data with the actual
1274                    resulting sizes */
1275                 struct winsize ws;
1276                 memset(&ws, 0, sizeof(ws));
1277                 ws.ws_row = vc->vc_rows;
1278                 ws.ws_col = vc->vc_cols;
1279                 ws.ws_ypixel = vc->vc_scan_lines;
1280                 tty_do_resize(tty, &ws);
1281         }
1282
1283         if (con_is_visible(vc))
1284                 update_screen(vc);
1285         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1286         notify_update(vc);
1287         return err;
1288 }
1289
1290 /**
1291  *      vc_resize               -       resize a VT
1292  *      @vc: virtual console
1293  *      @cols: columns
1294  *      @rows: rows
1295  *
1296  *      Resize a virtual console as seen from the console end of things. We
1297  *      use the common vc_do_resize methods to update the structures. The
1298  *      caller must hold the console sem to protect console internals and
1299  *      vc->port.tty
1300  */
1301
1302 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1303 {
1304         return vc_do_resize(vc->port.tty, vc, cols, rows);
1305 }
1306
1307 /**
1308  *      vt_resize               -       resize a VT
1309  *      @tty: tty to resize
1310  *      @ws: winsize attributes
1311  *
1312  *      Resize a virtual terminal. This is called by the tty layer as we
1313  *      register our own handler for resizing. The mutual helper does all
1314  *      the actual work.
1315  *
1316  *      Takes the console sem and the called methods then take the tty
1317  *      termios_rwsem and the tty ctrl_lock in that order.
1318  */
1319 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1320 {
1321         struct vc_data *vc = tty->driver_data;
1322         int ret;
1323
1324         console_lock();
1325         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1326         console_unlock();
1327         return ret;
1328 }
1329
1330 struct vc_data *vc_deallocate(unsigned int currcons)
1331 {
1332         struct vc_data *vc = NULL;
1333
1334         WARN_CONSOLE_UNLOCKED();
1335
1336         if (vc_cons_allocated(currcons)) {
1337                 struct vt_notifier_param param;
1338
1339                 param.vc = vc = vc_cons[currcons].d;
1340                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1341                 vcs_remove_sysfs(currcons);
1342                 visual_deinit(vc);
1343                 put_pid(vc->vt_pid);
1344                 vc_uniscr_set(vc, NULL);
1345                 kfree(vc->vc_screenbuf);
1346                 vc_cons[currcons].d = NULL;
1347         }
1348         return vc;
1349 }
1350
1351 /*
1352  *      VT102 emulator
1353  */
1354
1355 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1356
1357 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1358 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1359 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1360
1361 #define decarm          VC_REPEAT
1362 #define decckm          VC_CKMODE
1363 #define kbdapplic       VC_APPLIC
1364 #define lnm             VC_CRLF
1365
1366 /*
1367  * this is what the terminal answers to a ESC-Z or csi0c query.
1368  */
1369 #define VT100ID "\033[?1;2c"
1370 #define VT102ID "\033[?6c"
1371
1372 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1373                                        8,12,10,14, 9,13,11,15 };
1374
1375 /* the default colour table, for VGA+ colour systems */
1376 unsigned char default_red[] = {
1377         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1378         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1379 };
1380 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1381
1382 unsigned char default_grn[] = {
1383         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1384         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1385 };
1386 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1387
1388 unsigned char default_blu[] = {
1389         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1390         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1391 };
1392 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1393
1394 /*
1395  * gotoxy() must verify all boundaries, because the arguments
1396  * might also be negative. If the given position is out of
1397  * bounds, the cursor is placed at the nearest margin.
1398  */
1399 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1400 {
1401         int min_y, max_y;
1402
1403         if (new_x < 0)
1404                 vc->vc_x = 0;
1405         else {
1406                 if (new_x >= vc->vc_cols)
1407                         vc->vc_x = vc->vc_cols - 1;
1408                 else
1409                         vc->vc_x = new_x;
1410         }
1411
1412         if (vc->vc_decom) {
1413                 min_y = vc->vc_top;
1414                 max_y = vc->vc_bottom;
1415         } else {
1416                 min_y = 0;
1417                 max_y = vc->vc_rows;
1418         }
1419         if (new_y < min_y)
1420                 vc->vc_y = min_y;
1421         else if (new_y >= max_y)
1422                 vc->vc_y = max_y - 1;
1423         else
1424                 vc->vc_y = new_y;
1425         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1426         vc->vc_need_wrap = 0;
1427 }
1428
1429 /* for absolute user moves, when decom is set */
1430 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1431 {
1432         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1433 }
1434
1435 void scrollback(struct vc_data *vc)
1436 {
1437         scrolldelta(-(vc->vc_rows / 2));
1438 }
1439
1440 void scrollfront(struct vc_data *vc, int lines)
1441 {
1442         if (!lines)
1443                 lines = vc->vc_rows / 2;
1444         scrolldelta(lines);
1445 }
1446
1447 static void lf(struct vc_data *vc)
1448 {
1449         /* don't scroll if above bottom of scrolling region, or
1450          * if below scrolling region
1451          */
1452         if (vc->vc_y + 1 == vc->vc_bottom)
1453                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1454         else if (vc->vc_y < vc->vc_rows - 1) {
1455                 vc->vc_y++;
1456                 vc->vc_pos += vc->vc_size_row;
1457         }
1458         vc->vc_need_wrap = 0;
1459         notify_write(vc, '\n');
1460 }
1461
1462 static void ri(struct vc_data *vc)
1463 {
1464         /* don't scroll if below top of scrolling region, or
1465          * if above scrolling region
1466          */
1467         if (vc->vc_y == vc->vc_top)
1468                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1469         else if (vc->vc_y > 0) {
1470                 vc->vc_y--;
1471                 vc->vc_pos -= vc->vc_size_row;
1472         }
1473         vc->vc_need_wrap = 0;
1474 }
1475
1476 static inline void cr(struct vc_data *vc)
1477 {
1478         vc->vc_pos -= vc->vc_x << 1;
1479         vc->vc_need_wrap = vc->vc_x = 0;
1480         notify_write(vc, '\r');
1481 }
1482
1483 static inline void bs(struct vc_data *vc)
1484 {
1485         if (vc->vc_x) {
1486                 vc->vc_pos -= 2;
1487                 vc->vc_x--;
1488                 vc->vc_need_wrap = 0;
1489                 notify_write(vc, '\b');
1490         }
1491 }
1492
1493 static inline void del(struct vc_data *vc)
1494 {
1495         /* ignored */
1496 }
1497
1498 static void csi_J(struct vc_data *vc, int vpar)
1499 {
1500         unsigned int count;
1501         unsigned short * start;
1502
1503         switch (vpar) {
1504                 case 0: /* erase from cursor to end of display */
1505                         vc_uniscr_clear_line(vc, vc->vc_x,
1506                                              vc->vc_cols - vc->vc_x);
1507                         vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1508                                               vc->vc_rows - vc->vc_y - 1);
1509                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1510                         start = (unsigned short *)vc->vc_pos;
1511                         break;
1512                 case 1: /* erase from start to cursor */
1513                         vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1514                         vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1515                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1516                         start = (unsigned short *)vc->vc_origin;
1517                         break;
1518                 case 3: /* include scrollback */
1519                         flush_scrollback(vc);
1520                         /* fallthrough */
1521                 case 2: /* erase whole display */
1522                         vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1523                         count = vc->vc_cols * vc->vc_rows;
1524                         start = (unsigned short *)vc->vc_origin;
1525                         break;
1526                 default:
1527                         return;
1528         }
1529         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1530         if (con_should_update(vc))
1531                 do_update_region(vc, (unsigned long) start, count);
1532         vc->vc_need_wrap = 0;
1533 }
1534
1535 static void csi_K(struct vc_data *vc, int vpar)
1536 {
1537         unsigned int count;
1538         unsigned short *start = (unsigned short *)vc->vc_pos;
1539         int offset;
1540
1541         switch (vpar) {
1542                 case 0: /* erase from cursor to end of line */
1543                         offset = 0;
1544                         count = vc->vc_cols - vc->vc_x;
1545                         break;
1546                 case 1: /* erase from start of line to cursor */
1547                         offset = -vc->vc_x;
1548                         count = vc->vc_x + 1;
1549                         break;
1550                 case 2: /* erase whole line */
1551                         offset = -vc->vc_x;
1552                         count = vc->vc_cols;
1553                         break;
1554                 default:
1555                         return;
1556         }
1557         vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1558         scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1559         vc->vc_need_wrap = 0;
1560         if (con_should_update(vc))
1561                 do_update_region(vc, (unsigned long)(start + offset), count);
1562 }
1563
1564 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1565 {                                         /* not vt100? */
1566         int count;
1567
1568         if (!vpar)
1569                 vpar++;
1570         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1571
1572         vc_uniscr_clear_line(vc, vc->vc_x, count);
1573         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1574         if (con_should_update(vc))
1575                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1576         vc->vc_need_wrap = 0;
1577 }
1578
1579 static void default_attr(struct vc_data *vc)
1580 {
1581         vc->vc_intensity = 1;
1582         vc->vc_italic = 0;
1583         vc->vc_underline = 0;
1584         vc->vc_reverse = 0;
1585         vc->vc_blink = 0;
1586         vc->vc_color = vc->vc_def_color;
1587 }
1588
1589 struct rgb { u8 r; u8 g; u8 b; };
1590
1591 static void rgb_from_256(int i, struct rgb *c)
1592 {
1593         if (i < 8) {            /* Standard colours. */
1594                 c->r = i&1 ? 0xaa : 0x00;
1595                 c->g = i&2 ? 0xaa : 0x00;
1596                 c->b = i&4 ? 0xaa : 0x00;
1597         } else if (i < 16) {
1598                 c->r = i&1 ? 0xff : 0x55;
1599                 c->g = i&2 ? 0xff : 0x55;
1600                 c->b = i&4 ? 0xff : 0x55;
1601         } else if (i < 232) {   /* 6x6x6 colour cube. */
1602                 c->r = (i - 16) / 36 * 85 / 2;
1603                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1604                 c->b = (i - 16) % 6 * 85 / 2;
1605         } else                  /* Grayscale ramp. */
1606                 c->r = c->g = c->b = i * 10 - 2312;
1607 }
1608
1609 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1610 {
1611         u8 hue = 0, max = max3(c->r, c->g, c->b);
1612
1613         if (c->r > max / 2)
1614                 hue |= 4;
1615         if (c->g > max / 2)
1616                 hue |= 2;
1617         if (c->b > max / 2)
1618                 hue |= 1;
1619
1620         if (hue == 7 && max <= 0x55) {
1621                 hue = 0;
1622                 vc->vc_intensity = 2;
1623         } else if (max > 0xaa)
1624                 vc->vc_intensity = 2;
1625         else
1626                 vc->vc_intensity = 1;
1627
1628         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1629 }
1630
1631 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1632 {
1633         /* For backgrounds, err on the dark side. */
1634         vc->vc_color = (vc->vc_color & 0x0f)
1635                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1636 }
1637
1638 /*
1639  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1640  * and thus need to be detected and ignored by hand. That standard also
1641  * wants : rather than ; as separators but sequences containing : are currently
1642  * completely ignored by the parser.
1643  *
1644  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1645  * supporting them.
1646  */
1647 static int vc_t416_color(struct vc_data *vc, int i,
1648                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1649 {
1650         struct rgb c;
1651
1652         i++;
1653         if (i > vc->vc_npar)
1654                 return i;
1655
1656         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1657                 /* 256 colours */
1658                 i++;
1659                 rgb_from_256(vc->vc_par[i], &c);
1660         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1661                 /* 24 bit */
1662                 c.r = vc->vc_par[i + 1];
1663                 c.g = vc->vc_par[i + 2];
1664                 c.b = vc->vc_par[i + 3];
1665                 i += 3;
1666         } else
1667                 return i;
1668
1669         set_color(vc, &c);
1670
1671         return i;
1672 }
1673
1674 /* console_lock is held */
1675 static void csi_m(struct vc_data *vc)
1676 {
1677         int i;
1678
1679         for (i = 0; i <= vc->vc_npar; i++)
1680                 switch (vc->vc_par[i]) {
1681                 case 0: /* all attributes off */
1682                         default_attr(vc);
1683                         break;
1684                 case 1:
1685                         vc->vc_intensity = 2;
1686                         break;
1687                 case 2:
1688                         vc->vc_intensity = 0;
1689                         break;
1690                 case 3:
1691                         vc->vc_italic = 1;
1692                         break;
1693                 case 21:
1694                         /*
1695                          * No console drivers support double underline, so
1696                          * convert it to a single underline.
1697                          */
1698                 case 4:
1699                         vc->vc_underline = 1;
1700                         break;
1701                 case 5:
1702                         vc->vc_blink = 1;
1703                         break;
1704                 case 7:
1705                         vc->vc_reverse = 1;
1706                         break;
1707                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1708                           * Select primary font, don't display control chars if
1709                           * defined, don't set bit 8 on output.
1710                           */
1711                         vc->vc_translate = set_translate(vc->vc_charset == 0
1712                                         ? vc->vc_G0_charset
1713                                         : vc->vc_G1_charset, vc);
1714                         vc->vc_disp_ctrl = 0;
1715                         vc->vc_toggle_meta = 0;
1716                         break;
1717                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1718                           * Select first alternate font, lets chars < 32 be
1719                           * displayed as ROM chars.
1720                           */
1721                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1722                         vc->vc_disp_ctrl = 1;
1723                         vc->vc_toggle_meta = 0;
1724                         break;
1725                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1726                           * Select second alternate font, toggle high bit
1727                           * before displaying as ROM char.
1728                           */
1729                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1730                         vc->vc_disp_ctrl = 1;
1731                         vc->vc_toggle_meta = 1;
1732                         break;
1733                 case 22:
1734                         vc->vc_intensity = 1;
1735                         break;
1736                 case 23:
1737                         vc->vc_italic = 0;
1738                         break;
1739                 case 24:
1740                         vc->vc_underline = 0;
1741                         break;
1742                 case 25:
1743                         vc->vc_blink = 0;
1744                         break;
1745                 case 27:
1746                         vc->vc_reverse = 0;
1747                         break;
1748                 case 38:
1749                         i = vc_t416_color(vc, i, rgb_foreground);
1750                         break;
1751                 case 48:
1752                         i = vc_t416_color(vc, i, rgb_background);
1753                         break;
1754                 case 39:
1755                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1756                                 (vc->vc_color & 0xf0);
1757                         break;
1758                 case 49:
1759                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1760                                 (vc->vc_color & 0x0f);
1761                         break;
1762                 default:
1763                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1764                                 if (vc->vc_par[i] < 100)
1765                                         vc->vc_intensity = 2;
1766                                 vc->vc_par[i] -= 60;
1767                         }
1768                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1769                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1770                                         | (vc->vc_color & 0xf0);
1771                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1772                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1773                                         | (vc->vc_color & 0x0f);
1774                         break;
1775                 }
1776         update_attr(vc);
1777 }
1778
1779 static void respond_string(const char *p, struct tty_port *port)
1780 {
1781         while (*p) {
1782                 tty_insert_flip_char(port, *p, 0);
1783                 p++;
1784         }
1785         tty_schedule_flip(port);
1786 }
1787
1788 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1789 {
1790         char buf[40];
1791
1792         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1793         respond_string(buf, tty->port);
1794 }
1795
1796 static inline void status_report(struct tty_struct *tty)
1797 {
1798         respond_string("\033[0n", tty->port);   /* Terminal ok */
1799 }
1800
1801 static inline void respond_ID(struct tty_struct *tty)
1802 {
1803         respond_string(VT102ID, tty->port);
1804 }
1805
1806 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1807 {
1808         char buf[8];
1809
1810         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1811                 (char)('!' + mry));
1812         respond_string(buf, tty->port);
1813 }
1814
1815 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1816 int mouse_reporting(void)
1817 {
1818         return vc_cons[fg_console].d->vc_report_mouse;
1819 }
1820
1821 /* console_lock is held */
1822 static void set_mode(struct vc_data *vc, int on_off)
1823 {
1824         int i;
1825
1826         for (i = 0; i <= vc->vc_npar; i++)
1827                 if (vc->vc_priv == EPdec) {
1828                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1829                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1830                                 if (on_off)
1831                                         set_kbd(vc, decckm);
1832                                 else
1833                                         clr_kbd(vc, decckm);
1834                                 break;
1835                         case 3: /* 80/132 mode switch unimplemented */
1836 #if 0
1837                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1838                                 /* this alone does not suffice; some user mode
1839                                    utility has to change the hardware regs */
1840 #endif
1841                                 break;
1842                         case 5:                 /* Inverted screen on/off */
1843                                 if (vc->vc_decscnm != on_off) {
1844                                         vc->vc_decscnm = on_off;
1845                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1846                                         update_attr(vc);
1847                                 }
1848                                 break;
1849                         case 6:                 /* Origin relative/absolute */
1850                                 vc->vc_decom = on_off;
1851                                 gotoxay(vc, 0, 0);
1852                                 break;
1853                         case 7:                 /* Autowrap on/off */
1854                                 vc->vc_decawm = on_off;
1855                                 break;
1856                         case 8:                 /* Autorepeat on/off */
1857                                 if (on_off)
1858                                         set_kbd(vc, decarm);
1859                                 else
1860                                         clr_kbd(vc, decarm);
1861                                 break;
1862                         case 9:
1863                                 vc->vc_report_mouse = on_off ? 1 : 0;
1864                                 break;
1865                         case 25:                /* Cursor on/off */
1866                                 vc->vc_deccm = on_off;
1867                                 break;
1868                         case 1000:
1869                                 vc->vc_report_mouse = on_off ? 2 : 0;
1870                                 break;
1871                         }
1872                 } else {
1873                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1874                         case 3:                 /* Monitor (display ctrls) */
1875                                 vc->vc_disp_ctrl = on_off;
1876                                 break;
1877                         case 4:                 /* Insert Mode on/off */
1878                                 vc->vc_decim = on_off;
1879                                 break;
1880                         case 20:                /* Lf, Enter == CrLf/Lf */
1881                                 if (on_off)
1882                                         set_kbd(vc, lnm);
1883                                 else
1884                                         clr_kbd(vc, lnm);
1885                                 break;
1886                         }
1887                 }
1888 }
1889
1890 /* console_lock is held */
1891 static void setterm_command(struct vc_data *vc)
1892 {
1893         switch(vc->vc_par[0]) {
1894                 case 1: /* set color for underline mode */
1895                         if (vc->vc_can_do_color &&
1896                                         vc->vc_par[1] < 16) {
1897                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1898                                 if (vc->vc_underline)
1899                                         update_attr(vc);
1900                         }
1901                         break;
1902                 case 2: /* set color for half intensity mode */
1903                         if (vc->vc_can_do_color &&
1904                                         vc->vc_par[1] < 16) {
1905                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1906                                 if (vc->vc_intensity == 0)
1907                                         update_attr(vc);
1908                         }
1909                         break;
1910                 case 8: /* store colors as defaults */
1911                         vc->vc_def_color = vc->vc_attr;
1912                         if (vc->vc_hi_font_mask == 0x100)
1913                                 vc->vc_def_color >>= 1;
1914                         default_attr(vc);
1915                         update_attr(vc);
1916                         break;
1917                 case 9: /* set blanking interval */
1918                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1919                         poke_blanked_console();
1920                         break;
1921                 case 10: /* set bell frequency in Hz */
1922                         if (vc->vc_npar >= 1)
1923                                 vc->vc_bell_pitch = vc->vc_par[1];
1924                         else
1925                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1926                         break;
1927                 case 11: /* set bell duration in msec */
1928                         if (vc->vc_npar >= 1)
1929                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1930                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1931                         else
1932                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1933                         break;
1934                 case 12: /* bring specified console to the front */
1935                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1936                                 set_console(vc->vc_par[1] - 1);
1937                         break;
1938                 case 13: /* unblank the screen */
1939                         poke_blanked_console();
1940                         break;
1941                 case 14: /* set vesa powerdown interval */
1942                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1943                         break;
1944                 case 15: /* activate the previous console */
1945                         set_console(last_console);
1946                         break;
1947                 case 16: /* set cursor blink duration in msec */
1948                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1949                                         vc->vc_par[1] <= USHRT_MAX)
1950                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1951                         else
1952                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1953                         break;
1954         }
1955 }
1956
1957 /* console_lock is held */
1958 static void csi_at(struct vc_data *vc, unsigned int nr)
1959 {
1960         if (nr > vc->vc_cols - vc->vc_x)
1961                 nr = vc->vc_cols - vc->vc_x;
1962         else if (!nr)
1963                 nr = 1;
1964         insert_char(vc, nr);
1965 }
1966
1967 /* console_lock is held */
1968 static void csi_L(struct vc_data *vc, unsigned int nr)
1969 {
1970         if (nr > vc->vc_rows - vc->vc_y)
1971                 nr = vc->vc_rows - vc->vc_y;
1972         else if (!nr)
1973                 nr = 1;
1974         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1975         vc->vc_need_wrap = 0;
1976 }
1977
1978 /* console_lock is held */
1979 static void csi_P(struct vc_data *vc, unsigned int nr)
1980 {
1981         if (nr > vc->vc_cols - vc->vc_x)
1982                 nr = vc->vc_cols - vc->vc_x;
1983         else if (!nr)
1984                 nr = 1;
1985         delete_char(vc, nr);
1986 }
1987
1988 /* console_lock is held */
1989 static void csi_M(struct vc_data *vc, unsigned int nr)
1990 {
1991         if (nr > vc->vc_rows - vc->vc_y)
1992                 nr = vc->vc_rows - vc->vc_y;
1993         else if (!nr)
1994                 nr=1;
1995         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1996         vc->vc_need_wrap = 0;
1997 }
1998
1999 /* console_lock is held (except via vc_init->reset_terminal */
2000 static void save_cur(struct vc_data *vc)
2001 {
2002         vc->vc_saved_x          = vc->vc_x;
2003         vc->vc_saved_y          = vc->vc_y;
2004         vc->vc_s_intensity      = vc->vc_intensity;
2005         vc->vc_s_italic         = vc->vc_italic;
2006         vc->vc_s_underline      = vc->vc_underline;
2007         vc->vc_s_blink          = vc->vc_blink;
2008         vc->vc_s_reverse        = vc->vc_reverse;
2009         vc->vc_s_charset        = vc->vc_charset;
2010         vc->vc_s_color          = vc->vc_color;
2011         vc->vc_saved_G0         = vc->vc_G0_charset;
2012         vc->vc_saved_G1         = vc->vc_G1_charset;
2013 }
2014
2015 /* console_lock is held */
2016 static void restore_cur(struct vc_data *vc)
2017 {
2018         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2019         vc->vc_intensity        = vc->vc_s_intensity;
2020         vc->vc_italic           = vc->vc_s_italic;
2021         vc->vc_underline        = vc->vc_s_underline;
2022         vc->vc_blink            = vc->vc_s_blink;
2023         vc->vc_reverse          = vc->vc_s_reverse;
2024         vc->vc_charset          = vc->vc_s_charset;
2025         vc->vc_color            = vc->vc_s_color;
2026         vc->vc_G0_charset       = vc->vc_saved_G0;
2027         vc->vc_G1_charset       = vc->vc_saved_G1;
2028         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2029         update_attr(vc);
2030         vc->vc_need_wrap = 0;
2031 }
2032
2033 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2034         EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2035         ESpalette, ESosc };
2036
2037 /* console_lock is held (except via vc_init()) */
2038 static void reset_terminal(struct vc_data *vc, int do_clear)
2039 {
2040         vc->vc_top              = 0;
2041         vc->vc_bottom           = vc->vc_rows;
2042         vc->vc_state            = ESnormal;
2043         vc->vc_priv             = EPecma;
2044         vc->vc_translate        = set_translate(LAT1_MAP, vc);
2045         vc->vc_G0_charset       = LAT1_MAP;
2046         vc->vc_G1_charset       = GRAF_MAP;
2047         vc->vc_charset          = 0;
2048         vc->vc_need_wrap        = 0;
2049         vc->vc_report_mouse     = 0;
2050         vc->vc_utf              = default_utf8;
2051         vc->vc_utf_count        = 0;
2052
2053         vc->vc_disp_ctrl        = 0;
2054         vc->vc_toggle_meta      = 0;
2055
2056         vc->vc_decscnm          = 0;
2057         vc->vc_decom            = 0;
2058         vc->vc_decawm           = 1;
2059         vc->vc_deccm            = global_cursor_default;
2060         vc->vc_decim            = 0;
2061
2062         vt_reset_keyboard(vc->vc_num);
2063
2064         vc->vc_cursor_type = cur_default;
2065         vc->vc_complement_mask = vc->vc_s_complement_mask;
2066
2067         default_attr(vc);
2068         update_attr(vc);
2069
2070         vc->vc_tab_stop[0]      =
2071         vc->vc_tab_stop[1]      =
2072         vc->vc_tab_stop[2]      =
2073         vc->vc_tab_stop[3]      =
2074         vc->vc_tab_stop[4]      =
2075         vc->vc_tab_stop[5]      =
2076         vc->vc_tab_stop[6]      =
2077         vc->vc_tab_stop[7]      = 0x01010101;
2078
2079         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2080         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2081         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2082
2083         gotoxy(vc, 0, 0);
2084         save_cur(vc);
2085         if (do_clear)
2086             csi_J(vc, 2);
2087 }
2088
2089 /* console_lock is held */
2090 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2091 {
2092         /*
2093          *  Control characters can be used in the _middle_
2094          *  of an escape sequence.
2095          */
2096         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2097                 return;
2098         switch (c) {
2099         case 0:
2100                 return;
2101         case 7:
2102                 if (vc->vc_state == ESosc)
2103                         vc->vc_state = ESnormal;
2104                 else if (vc->vc_bell_duration)
2105                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2106                 return;
2107         case 8:
2108                 bs(vc);
2109                 return;
2110         case 9:
2111                 vc->vc_pos -= (vc->vc_x << 1);
2112                 while (vc->vc_x < vc->vc_cols - 1) {
2113                         vc->vc_x++;
2114                         if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
2115                                 break;
2116                 }
2117                 vc->vc_pos += (vc->vc_x << 1);
2118                 notify_write(vc, '\t');
2119                 return;
2120         case 10: case 11: case 12:
2121                 lf(vc);
2122                 if (!is_kbd(vc, lnm))
2123                         return;
2124                 /* fall through */
2125         case 13:
2126                 cr(vc);
2127                 return;
2128         case 14:
2129                 vc->vc_charset = 1;
2130                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2131                 vc->vc_disp_ctrl = 1;
2132                 return;
2133         case 15:
2134                 vc->vc_charset = 0;
2135                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2136                 vc->vc_disp_ctrl = 0;
2137                 return;
2138         case 24: case 26:
2139                 vc->vc_state = ESnormal;
2140                 return;
2141         case 27:
2142                 vc->vc_state = ESesc;
2143                 return;
2144         case 127:
2145                 del(vc);
2146                 return;
2147         case 128+27:
2148                 vc->vc_state = ESsquare;
2149                 return;
2150         }
2151         switch(vc->vc_state) {
2152         case ESesc:
2153                 vc->vc_state = ESnormal;
2154                 switch (c) {
2155                 case '[':
2156                         vc->vc_state = ESsquare;
2157                         return;
2158                 case ']':
2159                         vc->vc_state = ESnonstd;
2160                         return;
2161                 case '%':
2162                         vc->vc_state = ESpercent;
2163                         return;
2164                 case 'E':
2165                         cr(vc);
2166                         lf(vc);
2167                         return;
2168                 case 'M':
2169                         ri(vc);
2170                         return;
2171                 case 'D':
2172                         lf(vc);
2173                         return;
2174                 case 'H':
2175                         vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
2176                         return;
2177                 case 'Z':
2178                         respond_ID(tty);
2179                         return;
2180                 case '7':
2181                         save_cur(vc);
2182                         return;
2183                 case '8':
2184                         restore_cur(vc);
2185                         return;
2186                 case '(':
2187                         vc->vc_state = ESsetG0;
2188                         return;
2189                 case ')':
2190                         vc->vc_state = ESsetG1;
2191                         return;
2192                 case '#':
2193                         vc->vc_state = EShash;
2194                         return;
2195                 case 'c':
2196                         reset_terminal(vc, 1);
2197                         return;
2198                 case '>':  /* Numeric keypad */
2199                         clr_kbd(vc, kbdapplic);
2200                         return;
2201                 case '=':  /* Appl. keypad */
2202                         set_kbd(vc, kbdapplic);
2203                         return;
2204                 }
2205                 return;
2206         case ESnonstd:
2207                 if (c=='P') {   /* palette escape sequence */
2208                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2209                                 vc->vc_par[vc->vc_npar] = 0;
2210                         vc->vc_npar = 0;
2211                         vc->vc_state = ESpalette;
2212                         return;
2213                 } else if (c=='R') {   /* reset palette */
2214                         reset_palette(vc);
2215                         vc->vc_state = ESnormal;
2216                 } else if (c>='0' && c<='9')
2217                         vc->vc_state = ESosc;
2218                 else
2219                         vc->vc_state = ESnormal;
2220                 return;
2221         case ESpalette:
2222                 if (isxdigit(c)) {
2223                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2224                         if (vc->vc_npar == 7) {
2225                                 int i = vc->vc_par[0] * 3, j = 1;
2226                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2227                                 vc->vc_palette[i++] += vc->vc_par[j++];
2228                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2229                                 vc->vc_palette[i++] += vc->vc_par[j++];
2230                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2231                                 vc->vc_palette[i] += vc->vc_par[j];
2232                                 set_palette(vc);
2233                                 vc->vc_state = ESnormal;
2234                         }
2235                 } else
2236                         vc->vc_state = ESnormal;
2237                 return;
2238         case ESsquare:
2239                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2240                         vc->vc_par[vc->vc_npar] = 0;
2241                 vc->vc_npar = 0;
2242                 vc->vc_state = ESgetpars;
2243                 if (c == '[') { /* Function key */
2244                         vc->vc_state=ESfunckey;
2245                         return;
2246                 }
2247                 switch (c) {
2248                 case '?':
2249                         vc->vc_priv = EPdec;
2250                         return;
2251                 case '>':
2252                         vc->vc_priv = EPgt;
2253                         return;
2254                 case '=':
2255                         vc->vc_priv = EPeq;
2256                         return;
2257                 case '<':
2258                         vc->vc_priv = EPlt;
2259                         return;
2260                 }
2261                 vc->vc_priv = EPecma;
2262                 /* fall through */
2263         case ESgetpars:
2264                 if (c == ';' && vc->vc_npar < NPAR - 1) {
2265                         vc->vc_npar++;
2266                         return;
2267                 } else if (c>='0' && c<='9') {
2268                         vc->vc_par[vc->vc_npar] *= 10;
2269                         vc->vc_par[vc->vc_npar] += c - '0';
2270                         return;
2271                 }
2272                 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2273                         vc->vc_state = EScsiignore;
2274                         return;
2275                 }
2276                 vc->vc_state = ESnormal;
2277                 switch(c) {
2278                 case 'h':
2279                         if (vc->vc_priv <= EPdec)
2280                                 set_mode(vc, 1);
2281                         return;
2282                 case 'l':
2283                         if (vc->vc_priv <= EPdec)
2284                                 set_mode(vc, 0);
2285                         return;
2286                 case 'c':
2287                         if (vc->vc_priv == EPdec) {
2288                                 if (vc->vc_par[0])
2289                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2290                                 else
2291                                         vc->vc_cursor_type = cur_default;
2292                                 return;
2293                         }
2294                         break;
2295                 case 'm':
2296                         if (vc->vc_priv == EPdec) {
2297                                 clear_selection();
2298                                 if (vc->vc_par[0])
2299                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2300                                 else
2301                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
2302                                 return;
2303                         }
2304                         break;
2305                 case 'n':
2306                         if (vc->vc_priv == EPecma) {
2307                                 if (vc->vc_par[0] == 5)
2308                                         status_report(tty);
2309                                 else if (vc->vc_par[0] == 6)
2310                                         cursor_report(vc, tty);
2311                         }
2312                         return;
2313                 }
2314                 if (vc->vc_priv != EPecma) {
2315                         vc->vc_priv = EPecma;
2316                         return;
2317                 }
2318                 switch(c) {
2319                 case 'G': case '`':
2320                         if (vc->vc_par[0])
2321                                 vc->vc_par[0]--;
2322                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
2323                         return;
2324                 case 'A':
2325                         if (!vc->vc_par[0])
2326                                 vc->vc_par[0]++;
2327                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2328                         return;
2329                 case 'B': case 'e':
2330                         if (!vc->vc_par[0])
2331                                 vc->vc_par[0]++;
2332                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2333                         return;
2334                 case 'C': case 'a':
2335                         if (!vc->vc_par[0])
2336                                 vc->vc_par[0]++;
2337                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2338                         return;
2339                 case 'D':
2340                         if (!vc->vc_par[0])
2341                                 vc->vc_par[0]++;
2342                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2343                         return;
2344                 case 'E':
2345                         if (!vc->vc_par[0])
2346                                 vc->vc_par[0]++;
2347                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2348                         return;
2349                 case 'F':
2350                         if (!vc->vc_par[0])
2351                                 vc->vc_par[0]++;
2352                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2353                         return;
2354                 case 'd':
2355                         if (vc->vc_par[0])
2356                                 vc->vc_par[0]--;
2357                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2358                         return;
2359                 case 'H': case 'f':
2360                         if (vc->vc_par[0])
2361                                 vc->vc_par[0]--;
2362                         if (vc->vc_par[1])
2363                                 vc->vc_par[1]--;
2364                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2365                         return;
2366                 case 'J':
2367                         csi_J(vc, vc->vc_par[0]);
2368                         return;
2369                 case 'K':
2370                         csi_K(vc, vc->vc_par[0]);
2371                         return;
2372                 case 'L':
2373                         csi_L(vc, vc->vc_par[0]);
2374                         return;
2375                 case 'M':
2376                         csi_M(vc, vc->vc_par[0]);
2377                         return;
2378                 case 'P':
2379                         csi_P(vc, vc->vc_par[0]);
2380                         return;
2381                 case 'c':
2382                         if (!vc->vc_par[0])
2383                                 respond_ID(tty);
2384                         return;
2385                 case 'g':
2386                         if (!vc->vc_par[0])
2387                                 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2388                         else if (vc->vc_par[0] == 3) {
2389                                 vc->vc_tab_stop[0] =
2390                                         vc->vc_tab_stop[1] =
2391                                         vc->vc_tab_stop[2] =
2392                                         vc->vc_tab_stop[3] =
2393                                         vc->vc_tab_stop[4] =
2394                                         vc->vc_tab_stop[5] =
2395                                         vc->vc_tab_stop[6] =
2396                                         vc->vc_tab_stop[7] = 0;
2397                         }
2398                         return;
2399                 case 'm':
2400                         csi_m(vc);
2401                         return;
2402                 case 'q': /* DECLL - but only 3 leds */
2403                         /* map 0,1,2,3 to 0,1,2,4 */
2404                         if (vc->vc_par[0] < 4)
2405                                 vt_set_led_state(vc->vc_num,
2406                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2407                         return;
2408                 case 'r':
2409                         if (!vc->vc_par[0])
2410                                 vc->vc_par[0]++;
2411                         if (!vc->vc_par[1])
2412                                 vc->vc_par[1] = vc->vc_rows;
2413                         /* Minimum allowed region is 2 lines */
2414                         if (vc->vc_par[0] < vc->vc_par[1] &&
2415                             vc->vc_par[1] <= vc->vc_rows) {
2416                                 vc->vc_top = vc->vc_par[0] - 1;
2417                                 vc->vc_bottom = vc->vc_par[1];
2418                                 gotoxay(vc, 0, 0);
2419                         }
2420                         return;
2421                 case 's':
2422                         save_cur(vc);
2423                         return;
2424                 case 'u':
2425                         restore_cur(vc);
2426                         return;
2427                 case 'X':
2428                         csi_X(vc, vc->vc_par[0]);
2429                         return;
2430                 case '@':
2431                         csi_at(vc, vc->vc_par[0]);
2432                         return;
2433                 case ']': /* setterm functions */
2434                         setterm_command(vc);
2435                         return;
2436                 }
2437                 return;
2438         case EScsiignore:
2439                 if (c >= 20 && c <= 0x3f)
2440                         return;
2441                 vc->vc_state = ESnormal;
2442                 return;
2443         case ESpercent:
2444                 vc->vc_state = ESnormal;
2445                 switch (c) {
2446                 case '@':  /* defined in ISO 2022 */
2447                         vc->vc_utf = 0;
2448                         return;
2449                 case 'G':  /* prelim official escape code */
2450                 case '8':  /* retained for compatibility */
2451                         vc->vc_utf = 1;
2452                         return;
2453                 }
2454                 return;
2455         case ESfunckey:
2456                 vc->vc_state = ESnormal;
2457                 return;
2458         case EShash:
2459                 vc->vc_state = ESnormal;
2460                 if (c == '8') {
2461                         /* DEC screen alignment test. kludge :-) */
2462                         vc->vc_video_erase_char =
2463                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2464                         csi_J(vc, 2);
2465                         vc->vc_video_erase_char =
2466                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2467                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2468                 }
2469                 return;
2470         case ESsetG0:
2471                 if (c == '0')
2472                         vc->vc_G0_charset = GRAF_MAP;
2473                 else if (c == 'B')
2474                         vc->vc_G0_charset = LAT1_MAP;
2475                 else if (c == 'U')
2476                         vc->vc_G0_charset = IBMPC_MAP;
2477                 else if (c == 'K')
2478                         vc->vc_G0_charset = USER_MAP;
2479                 if (vc->vc_charset == 0)
2480                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2481                 vc->vc_state = ESnormal;
2482                 return;
2483         case ESsetG1:
2484                 if (c == '0')
2485                         vc->vc_G1_charset = GRAF_MAP;
2486                 else if (c == 'B')
2487                         vc->vc_G1_charset = LAT1_MAP;
2488                 else if (c == 'U')
2489                         vc->vc_G1_charset = IBMPC_MAP;
2490                 else if (c == 'K')
2491                         vc->vc_G1_charset = USER_MAP;
2492                 if (vc->vc_charset == 1)
2493                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2494                 vc->vc_state = ESnormal;
2495                 return;
2496         case ESosc:
2497                 return;
2498         default:
2499                 vc->vc_state = ESnormal;
2500         }
2501 }
2502
2503 /* is_double_width() is based on the wcwidth() implementation by
2504  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2505  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2506  */
2507 struct interval {
2508         uint32_t first;
2509         uint32_t last;
2510 };
2511
2512 static int ucs_cmp(const void *key, const void *elt)
2513 {
2514         uint32_t ucs = *(uint32_t *)key;
2515         struct interval e = *(struct interval *) elt;
2516
2517         if (ucs > e.last)
2518                 return 1;
2519         else if (ucs < e.first)
2520                 return -1;
2521         return 0;
2522 }
2523
2524 static int is_double_width(uint32_t ucs)
2525 {
2526         static const struct interval double_width[] = {
2527                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2528                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2529                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2530                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2531         };
2532         if (ucs < double_width[0].first ||
2533             ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2534                 return 0;
2535
2536         return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2537                         sizeof(struct interval), ucs_cmp) != NULL;
2538 }
2539
2540 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2541                 unsigned long draw_to, int *draw_x)
2542 {
2543         if (*draw_x < 0)
2544                 return;
2545
2546         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2547                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2548         *draw_x = -1;
2549 }
2550
2551 /* acquires console_lock */
2552 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2553 {
2554         int c, next_c, tc, ok, n = 0, draw_x = -1;
2555         unsigned int currcons;
2556         unsigned long draw_from = 0, draw_to = 0;
2557         struct vc_data *vc;
2558         unsigned char vc_attr;
2559         struct vt_notifier_param param;
2560         uint8_t rescan;
2561         uint8_t inverse;
2562         uint8_t width;
2563         u16 himask, charmask;
2564
2565         if (in_interrupt())
2566                 return count;
2567
2568         might_sleep();
2569
2570         console_lock();
2571         vc = tty->driver_data;
2572         if (vc == NULL) {
2573                 pr_err("vt: argh, driver_data is NULL !\n");
2574                 console_unlock();
2575                 return 0;
2576         }
2577
2578         currcons = vc->vc_num;
2579         if (!vc_cons_allocated(currcons)) {
2580                 /* could this happen? */
2581                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2582                 console_unlock();
2583                 return 0;
2584         }
2585
2586         himask = vc->vc_hi_font_mask;
2587         charmask = himask ? 0x1ff : 0xff;
2588
2589         /* undraw cursor first */
2590         if (con_is_fg(vc))
2591                 hide_cursor(vc);
2592
2593         param.vc = vc;
2594
2595         while (!tty->stopped && count) {
2596                 int orig = *buf;
2597                 c = orig;
2598                 buf++;
2599                 n++;
2600                 count--;
2601                 rescan = 0;
2602                 inverse = 0;
2603                 width = 1;
2604
2605                 /* Do no translation at all in control states */
2606                 if (vc->vc_state != ESnormal) {
2607                         tc = c;
2608                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2609                     /* Combine UTF-8 into Unicode in vc_utf_char.
2610                      * vc_utf_count is the number of continuation bytes still
2611                      * expected to arrive.
2612                      * vc_npar is the number of continuation bytes arrived so
2613                      * far
2614                      */
2615 rescan_last_byte:
2616                     if ((c & 0xc0) == 0x80) {
2617                         /* Continuation byte received */
2618                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2619                         if (vc->vc_utf_count) {
2620                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2621                             vc->vc_npar++;
2622                             if (--vc->vc_utf_count) {
2623                                 /* Still need some bytes */
2624                                 continue;
2625                             }
2626                             /* Got a whole character */
2627                             c = vc->vc_utf_char;
2628                             /* Reject overlong sequences */
2629                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2630                                         c > utf8_length_changes[vc->vc_npar])
2631                                 c = 0xfffd;
2632                         } else {
2633                             /* Unexpected continuation byte */
2634                             vc->vc_utf_count = 0;
2635                             c = 0xfffd;
2636                         }
2637                     } else {
2638                         /* Single ASCII byte or first byte of a sequence received */
2639                         if (vc->vc_utf_count) {
2640                             /* Continuation byte expected */
2641                             rescan = 1;
2642                             vc->vc_utf_count = 0;
2643                             c = 0xfffd;
2644                         } else if (c > 0x7f) {
2645                             /* First byte of a multibyte sequence received */
2646                             vc->vc_npar = 0;
2647                             if ((c & 0xe0) == 0xc0) {
2648                                 vc->vc_utf_count = 1;
2649                                 vc->vc_utf_char = (c & 0x1f);
2650                             } else if ((c & 0xf0) == 0xe0) {
2651                                 vc->vc_utf_count = 2;
2652                                 vc->vc_utf_char = (c & 0x0f);
2653                             } else if ((c & 0xf8) == 0xf0) {
2654                                 vc->vc_utf_count = 3;
2655                                 vc->vc_utf_char = (c & 0x07);
2656                             } else if ((c & 0xfc) == 0xf8) {
2657                                 vc->vc_utf_count = 4;
2658                                 vc->vc_utf_char = (c & 0x03);
2659                             } else if ((c & 0xfe) == 0xfc) {
2660                                 vc->vc_utf_count = 5;
2661                                 vc->vc_utf_char = (c & 0x01);
2662                             } else {
2663                                 /* 254 and 255 are invalid */
2664                                 c = 0xfffd;
2665                             }
2666                             if (vc->vc_utf_count) {
2667                                 /* Still need some bytes */
2668                                 continue;
2669                             }
2670                         }
2671                         /* Nothing to do if an ASCII byte was received */
2672                     }
2673                     /* End of UTF-8 decoding. */
2674                     /* c is the received character, or U+FFFD for invalid sequences. */
2675                     /* Replace invalid Unicode code points with U+FFFD too */
2676                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2677                         c = 0xfffd;
2678                     tc = c;
2679                 } else {        /* no utf or alternate charset mode */
2680                     tc = vc_translate(vc, c);
2681                 }
2682
2683                 param.c = tc;
2684                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2685                                         &param) == NOTIFY_STOP)
2686                         continue;
2687
2688                 /* If the original code was a control character we
2689                  * only allow a glyph to be displayed if the code is
2690                  * not normally used (such as for cursor movement) or
2691                  * if the disp_ctrl mode has been explicitly enabled.
2692                  * Certain characters (as given by the CTRL_ALWAYS
2693                  * bitmap) are always displayed as control characters,
2694                  * as the console would be pretty useless without
2695                  * them; to display an arbitrary font position use the
2696                  * direct-to-font zone in UTF-8 mode.
2697                  */
2698                 ok = tc && (c >= 32 ||
2699                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2700                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2701                         && (c != 127 || vc->vc_disp_ctrl)
2702                         && (c != 128+27);
2703
2704                 if (vc->vc_state == ESnormal && ok) {
2705                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2706                                 if (is_double_width(c))
2707                                         width = 2;
2708                         }
2709                         /* Now try to find out how to display it */
2710                         tc = conv_uni_to_pc(vc, tc);
2711                         if (tc & ~charmask) {
2712                                 if (tc == -1 || tc == -2) {
2713                                     continue; /* nothing to display */
2714                                 }
2715                                 /* Glyph not found */
2716                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2717                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2718                                        This would make absolutely no sense with Unicode in mind,
2719                                        but do this for ASCII characters since a font may lack
2720                                        Unicode mapping info and we don't want to end up with
2721                                        having question marks only. */
2722                                     tc = c;
2723                                 } else {
2724                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2725                                     tc = conv_uni_to_pc(vc, 0xfffd);
2726                                     if (tc < 0) {
2727                                         inverse = 1;
2728                                         tc = conv_uni_to_pc(vc, '?');
2729                                         if (tc < 0) tc = '?';
2730                                     }
2731                                 }
2732                         }
2733
2734                         if (!inverse) {
2735                                 vc_attr = vc->vc_attr;
2736                         } else {
2737                                 /* invert vc_attr */
2738                                 if (!vc->vc_can_do_color) {
2739                                         vc_attr = (vc->vc_attr) ^ 0x08;
2740                                 } else if (vc->vc_hi_font_mask == 0x100) {
2741                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2742                                 } else {
2743                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2744                                 }
2745                                 con_flush(vc, draw_from, draw_to, &draw_x);
2746                         }
2747
2748                         next_c = c;
2749                         while (1) {
2750                                 if (vc->vc_need_wrap || vc->vc_decim)
2751                                         con_flush(vc, draw_from, draw_to,
2752                                                         &draw_x);
2753                                 if (vc->vc_need_wrap) {
2754                                         cr(vc);
2755                                         lf(vc);
2756                                 }
2757                                 if (vc->vc_decim)
2758                                         insert_char(vc, 1);
2759                                 vc_uniscr_putc(vc, next_c);
2760                                 scr_writew(himask ?
2761                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2762                                              (vc_attr << 8) + tc,
2763                                            (u16 *) vc->vc_pos);
2764                                 if (con_should_update(vc) && draw_x < 0) {
2765                                         draw_x = vc->vc_x;
2766                                         draw_from = vc->vc_pos;
2767                                 }
2768                                 if (vc->vc_x == vc->vc_cols - 1) {
2769                                         vc->vc_need_wrap = vc->vc_decawm;
2770                                         draw_to = vc->vc_pos + 2;
2771                                 } else {
2772                                         vc->vc_x++;
2773                                         draw_to = (vc->vc_pos += 2);
2774                                 }
2775
2776                                 if (!--width) break;
2777
2778                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2779                                 if (tc < 0) tc = ' ';
2780                                 next_c = ' ';
2781                         }
2782                         notify_write(vc, c);
2783
2784                         if (inverse)
2785                                 con_flush(vc, draw_from, draw_to, &draw_x);
2786
2787                         if (rescan) {
2788                                 rescan = 0;
2789                                 inverse = 0;
2790                                 width = 1;
2791                                 c = orig;
2792                                 goto rescan_last_byte;
2793                         }
2794                         continue;
2795                 }
2796                 con_flush(vc, draw_from, draw_to, &draw_x);
2797                 do_con_trol(tty, vc, orig);
2798         }
2799         con_flush(vc, draw_from, draw_to, &draw_x);
2800         vc_uniscr_debug_check(vc);
2801         console_conditional_schedule();
2802         notify_update(vc);
2803         console_unlock();
2804         return n;
2805 }
2806
2807 /*
2808  * This is the console switching callback.
2809  *
2810  * Doing console switching in a process context allows
2811  * us to do the switches asynchronously (needed when we want
2812  * to switch due to a keyboard interrupt).  Synchronization
2813  * with other console code and prevention of re-entrancy is
2814  * ensured with console_lock.
2815  */
2816 static void console_callback(struct work_struct *ignored)
2817 {
2818         console_lock();
2819
2820         if (want_console >= 0) {
2821                 if (want_console != fg_console &&
2822                     vc_cons_allocated(want_console)) {
2823                         hide_cursor(vc_cons[fg_console].d);
2824                         change_console(vc_cons[want_console].d);
2825                         /* we only changed when the console had already
2826                            been allocated - a new console is not created
2827                            in an interrupt routine */
2828                 }
2829                 want_console = -1;
2830         }
2831         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2832                 do_poke_blanked_console = 0;
2833                 poke_blanked_console();
2834         }
2835         if (scrollback_delta) {
2836                 struct vc_data *vc = vc_cons[fg_console].d;
2837                 clear_selection();
2838                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2839                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2840                 scrollback_delta = 0;
2841         }
2842         if (blank_timer_expired) {
2843                 do_blank_screen(0);
2844                 blank_timer_expired = 0;
2845         }
2846         notify_update(vc_cons[fg_console].d);
2847
2848         console_unlock();
2849 }
2850
2851 int set_console(int nr)
2852 {
2853         struct vc_data *vc = vc_cons[fg_console].d;
2854
2855         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2856                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2857
2858                 /*
2859                  * Console switch will fail in console_callback() or
2860                  * change_console() so there is no point scheduling
2861                  * the callback
2862                  *
2863                  * Existing set_console() users don't check the return
2864                  * value so this shouldn't break anything
2865                  */
2866                 return -EINVAL;
2867         }
2868
2869         want_console = nr;
2870         schedule_console_callback();
2871
2872         return 0;
2873 }
2874
2875 struct tty_driver *console_driver;
2876
2877 #ifdef CONFIG_VT_CONSOLE
2878
2879 /**
2880  * vt_kmsg_redirect() - Sets/gets the kernel message console
2881  * @new:        The new virtual terminal number or -1 if the console should stay
2882  *              unchanged
2883  *
2884  * By default, the kernel messages are always printed on the current virtual
2885  * console. However, the user may modify that default with the
2886  * TIOCL_SETKMSGREDIRECT ioctl call.
2887  *
2888  * This function sets the kernel message console to be @new. It returns the old
2889  * virtual console number. The virtual terminal number 0 (both as parameter and
2890  * return value) means no redirection (i.e. always printed on the currently
2891  * active console).
2892  *
2893  * The parameter -1 means that only the current console is returned, but the
2894  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2895  * case to make the code more understandable.
2896  *
2897  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2898  * the parameter and always returns 0.
2899  */
2900 int vt_kmsg_redirect(int new)
2901 {
2902         static int kmsg_con;
2903
2904         if (new != -1)
2905                 return xchg(&kmsg_con, new);
2906         else
2907                 return kmsg_con;
2908 }
2909
2910 /*
2911  *      Console on virtual terminal
2912  *
2913  * The console must be locked when we get here.
2914  */
2915
2916 static void vt_console_print(struct console *co, const char *b, unsigned count)
2917 {
2918         struct vc_data *vc = vc_cons[fg_console].d;
2919         unsigned char c;
2920         static DEFINE_SPINLOCK(printing_lock);
2921         const ushort *start;
2922         ushort start_x, cnt;
2923         int kmsg_console;
2924
2925         /* console busy or not yet initialized */
2926         if (!printable)
2927                 return;
2928         if (!spin_trylock(&printing_lock))
2929                 return;
2930
2931         kmsg_console = vt_get_kmsg_redirect();
2932         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2933                 vc = vc_cons[kmsg_console - 1].d;
2934
2935         if (!vc_cons_allocated(fg_console)) {
2936                 /* impossible */
2937                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2938                 goto quit;
2939         }
2940
2941         if (vc->vc_mode != KD_TEXT)
2942                 goto quit;
2943
2944         /* undraw cursor first */
2945         if (con_is_fg(vc))
2946                 hide_cursor(vc);
2947
2948         start = (ushort *)vc->vc_pos;
2949         start_x = vc->vc_x;
2950         cnt = 0;
2951         while (count--) {
2952                 c = *b++;
2953                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2954                         if (cnt && con_is_visible(vc))
2955                                 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2956                         cnt = 0;
2957                         if (c == 8) {           /* backspace */
2958                                 bs(vc);
2959                                 start = (ushort *)vc->vc_pos;
2960                                 start_x = vc->vc_x;
2961                                 continue;
2962                         }
2963                         if (c != 13)
2964                                 lf(vc);
2965                         cr(vc);
2966                         start = (ushort *)vc->vc_pos;
2967                         start_x = vc->vc_x;
2968                         if (c == 10 || c == 13)
2969                                 continue;
2970                 }
2971                 vc_uniscr_putc(vc, c);
2972                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2973                 notify_write(vc, c);
2974                 cnt++;
2975                 if (vc->vc_x == vc->vc_cols - 1) {
2976                         vc->vc_need_wrap = 1;
2977                 } else {
2978                         vc->vc_pos += 2;
2979                         vc->vc_x++;
2980                 }
2981         }
2982         if (cnt && con_is_visible(vc))
2983                 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2984         set_cursor(vc);
2985         notify_update(vc);
2986
2987 quit:
2988         spin_unlock(&printing_lock);
2989 }
2990
2991 static struct tty_driver *vt_console_device(struct console *c, int *index)
2992 {
2993         *index = c->index ? c->index-1 : fg_console;
2994         return console_driver;
2995 }
2996
2997 static struct console vt_console_driver = {
2998         .name           = "tty",
2999         .write          = vt_console_print,
3000         .device         = vt_console_device,
3001         .unblank        = unblank_screen,
3002         .flags          = CON_PRINTBUFFER,
3003         .index          = -1,
3004 };
3005 #endif
3006
3007 /*
3008  *      Handling of Linux-specific VC ioctls
3009  */
3010
3011 /*
3012  * Generally a bit racy with respect to console_lock();.
3013  *
3014  * There are some functions which don't need it.
3015  *
3016  * There are some functions which can sleep for arbitrary periods
3017  * (paste_selection) but we don't need the lock there anyway.
3018  *
3019  * set_selection_user has locking, and definitely needs it
3020  */
3021
3022 int tioclinux(struct tty_struct *tty, unsigned long arg)
3023 {
3024         char type, data;
3025         char __user *p = (char __user *)arg;
3026         int lines;
3027         int ret;
3028
3029         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3030                 return -EPERM;
3031         if (get_user(type, p))
3032                 return -EFAULT;
3033         ret = 0;
3034
3035         switch (type)
3036         {
3037                 case TIOCL_SETSEL:
3038                         console_lock();
3039                         ret = set_selection_user((struct tiocl_selection
3040                                                  __user *)(p+1), tty);
3041                         console_unlock();
3042                         break;
3043                 case TIOCL_PASTESEL:
3044                         ret = paste_selection(tty);
3045                         break;
3046                 case TIOCL_UNBLANKSCREEN:
3047                         console_lock();
3048                         unblank_screen();
3049                         console_unlock();
3050                         break;
3051                 case TIOCL_SELLOADLUT:
3052                         console_lock();
3053                         ret = sel_loadlut(p);
3054                         console_unlock();
3055                         break;
3056                 case TIOCL_GETSHIFTSTATE:
3057
3058         /*
3059          * Make it possible to react to Shift+Mousebutton.
3060          * Note that 'shift_state' is an undocumented
3061          * kernel-internal variable; programs not closely
3062          * related to the kernel should not use this.
3063          */
3064                         data = vt_get_shift_state();
3065                         ret = put_user(data, p);
3066                         break;
3067                 case TIOCL_GETMOUSEREPORTING:
3068                         console_lock(); /* May be overkill */
3069                         data = mouse_reporting();
3070                         console_unlock();
3071                         ret = put_user(data, p);
3072                         break;
3073                 case TIOCL_SETVESABLANK:
3074                         console_lock();
3075                         ret = set_vesa_blanking(p);
3076                         console_unlock();
3077                         break;
3078                 case TIOCL_GETKMSGREDIRECT:
3079                         data = vt_get_kmsg_redirect();
3080                         ret = put_user(data, p);
3081                         break;
3082                 case TIOCL_SETKMSGREDIRECT:
3083                         if (!capable(CAP_SYS_ADMIN)) {
3084                                 ret = -EPERM;
3085                         } else {
3086                                 if (get_user(data, p+1))
3087                                         ret = -EFAULT;
3088                                 else
3089                                         vt_kmsg_redirect(data);
3090                         }
3091                         break;
3092                 case TIOCL_GETFGCONSOLE:
3093                         /* No locking needed as this is a transiently
3094                            correct return anyway if the caller hasn't
3095                            disabled switching */
3096                         ret = fg_console;
3097                         break;
3098                 case TIOCL_SCROLLCONSOLE:
3099                         if (get_user(lines, (s32 __user *)(p+4))) {
3100                                 ret = -EFAULT;
3101                         } else {
3102                                 /* Need the console lock here. Note that lots
3103                                    of other calls need fixing before the lock
3104                                    is actually useful ! */
3105                                 console_lock();
3106                                 scrollfront(vc_cons[fg_console].d, lines);
3107                                 console_unlock();
3108                                 ret = 0;
3109                         }
3110                         break;
3111                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3112                         console_lock();
3113                         ignore_poke = 1;
3114                         do_blank_screen(0);
3115                         console_unlock();
3116                         break;
3117                 case TIOCL_BLANKEDSCREEN:
3118                         ret = console_blanked;
3119                         break;
3120                 default:
3121                         ret = -EINVAL;
3122                         break;
3123         }
3124         return ret;
3125 }
3126
3127 /*
3128  * /dev/ttyN handling
3129  */
3130
3131 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3132 {
3133         int     retval;
3134
3135         retval = do_con_write(tty, buf, count);
3136         con_flush_chars(tty);
3137
3138         return retval;
3139 }
3140
3141 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3142 {
3143         if (in_interrupt())
3144                 return 0;       /* n_r3964 calls put_char() from interrupt context */
3145         return do_con_write(tty, &ch, 1);
3146 }
3147
3148 static int con_write_room(struct tty_struct *tty)
3149 {
3150         if (tty->stopped)
3151                 return 0;
3152         return 32768;           /* No limit, really; we're not buffering */
3153 }
3154
3155 static int con_chars_in_buffer(struct tty_struct *tty)
3156 {
3157         return 0;               /* we're not buffering */
3158 }
3159
3160 /*
3161  * con_throttle and con_unthrottle are only used for
3162  * paste_selection(), which has to stuff in a large number of
3163  * characters...
3164  */
3165 static void con_throttle(struct tty_struct *tty)
3166 {
3167 }
3168
3169 static void con_unthrottle(struct tty_struct *tty)
3170 {
3171         struct vc_data *vc = tty->driver_data;
3172
3173         wake_up_interruptible(&vc->paste_wait);
3174 }
3175
3176 /*
3177  * Turn the Scroll-Lock LED on when the tty is stopped
3178  */
3179 static void con_stop(struct tty_struct *tty)
3180 {
3181         int console_num;
3182         if (!tty)
3183                 return;
3184         console_num = tty->index;
3185         if (!vc_cons_allocated(console_num))
3186                 return;
3187         vt_kbd_con_stop(console_num);
3188 }
3189
3190 /*
3191  * Turn the Scroll-Lock LED off when the console is started
3192  */
3193 static void con_start(struct tty_struct *tty)
3194 {
3195         int console_num;
3196         if (!tty)
3197                 return;
3198         console_num = tty->index;
3199         if (!vc_cons_allocated(console_num))
3200                 return;
3201         vt_kbd_con_start(console_num);
3202 }
3203
3204 static void con_flush_chars(struct tty_struct *tty)
3205 {
3206         struct vc_data *vc;
3207
3208         if (in_interrupt())     /* from flush_to_ldisc */
3209                 return;
3210
3211         /* if we race with con_close(), vt may be null */
3212         console_lock();
3213         vc = tty->driver_data;
3214         if (vc)
3215                 set_cursor(vc);
3216         console_unlock();
3217 }
3218
3219 /*
3220  * Allocate the console screen memory.
3221  */
3222 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3223 {
3224         unsigned int currcons = tty->index;
3225         struct vc_data *vc;
3226         int ret;
3227
3228         console_lock();
3229         ret = vc_allocate(currcons);
3230         if (ret)
3231                 goto unlock;
3232
3233         vc = vc_cons[currcons].d;
3234
3235         /* Still being freed */
3236         if (vc->port.tty) {
3237                 ret = -ERESTARTSYS;
3238                 goto unlock;
3239         }
3240
3241         ret = tty_port_install(&vc->port, driver, tty);
3242         if (ret)
3243                 goto unlock;
3244
3245         tty->driver_data = vc;
3246         vc->port.tty = tty;
3247
3248         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3249                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3250                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3251         }
3252         if (vc->vc_utf)
3253                 tty->termios.c_iflag |= IUTF8;
3254         else
3255                 tty->termios.c_iflag &= ~IUTF8;
3256 unlock:
3257         console_unlock();
3258         return ret;
3259 }
3260
3261 static int con_open(struct tty_struct *tty, struct file *filp)
3262 {
3263         /* everything done in install */
3264         return 0;
3265 }
3266
3267
3268 static void con_close(struct tty_struct *tty, struct file *filp)
3269 {
3270         /* Nothing to do - we defer to shutdown */
3271 }
3272
3273 static void con_shutdown(struct tty_struct *tty)
3274 {
3275         struct vc_data *vc = tty->driver_data;
3276         BUG_ON(vc == NULL);
3277         console_lock();
3278         vc->port.tty = NULL;
3279         console_unlock();
3280 }
3281
3282 static int default_color           = 7; /* white */
3283 static int default_italic_color    = 2; // green (ASCII)
3284 static int default_underline_color = 3; // cyan (ASCII)
3285 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3286 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3287 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3288
3289 static void vc_init(struct vc_data *vc, unsigned int rows,
3290                     unsigned int cols, int do_clear)
3291 {
3292         int j, k ;
3293
3294         vc->vc_cols = cols;
3295         vc->vc_rows = rows;
3296         vc->vc_size_row = cols << 1;
3297         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3298
3299         set_origin(vc);
3300         vc->vc_pos = vc->vc_origin;
3301         reset_vc(vc);
3302         for (j=k=0; j<16; j++) {
3303                 vc->vc_palette[k++] = default_red[j] ;
3304                 vc->vc_palette[k++] = default_grn[j] ;
3305                 vc->vc_palette[k++] = default_blu[j] ;
3306         }
3307         vc->vc_def_color       = default_color;
3308         vc->vc_ulcolor         = default_underline_color;
3309         vc->vc_itcolor         = default_italic_color;
3310         vc->vc_halfcolor       = 0x08;   /* grey */
3311         init_waitqueue_head(&vc->paste_wait);
3312         reset_terminal(vc, do_clear);
3313 }
3314
3315 /*
3316  * This routine initializes console interrupts, and does nothing
3317  * else. If you want the screen to clear, call tty_write with
3318  * the appropriate escape-sequence.
3319  */
3320
3321 static int __init con_init(void)
3322 {
3323         const char *display_desc = NULL;
3324         struct vc_data *vc;
3325         unsigned int currcons = 0, i;
3326
3327         console_lock();
3328
3329         if (conswitchp)
3330                 display_desc = conswitchp->con_startup();
3331         if (!display_desc) {
3332                 fg_console = 0;
3333                 console_unlock();
3334                 return 0;
3335         }
3336
3337         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3338                 struct con_driver *con_driver = &registered_con_driver[i];
3339
3340                 if (con_driver->con == NULL) {
3341                         con_driver->con = conswitchp;
3342                         con_driver->desc = display_desc;
3343                         con_driver->flag = CON_DRIVER_FLAG_INIT;
3344                         con_driver->first = 0;
3345                         con_driver->last = MAX_NR_CONSOLES - 1;
3346                         break;
3347                 }
3348         }
3349
3350         for (i = 0; i < MAX_NR_CONSOLES; i++)
3351                 con_driver_map[i] = conswitchp;
3352
3353         if (blankinterval) {
3354                 blank_state = blank_normal_wait;
3355                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3356         }
3357
3358         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3359                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3360                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3361                 tty_port_init(&vc->port);
3362                 visual_init(vc, currcons, 1);
3363                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3364                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3365                         currcons || !vc->vc_sw->con_save_screen);
3366         }
3367         currcons = fg_console = 0;
3368         master_display_fg = vc = vc_cons[currcons].d;
3369         set_origin(vc);
3370         save_screen(vc);
3371         gotoxy(vc, vc->vc_x, vc->vc_y);
3372         csi_J(vc, 0);
3373         update_screen(vc);
3374         pr_info("Console: %s %s %dx%d\n",
3375                 vc->vc_can_do_color ? "colour" : "mono",
3376                 display_desc, vc->vc_cols, vc->vc_rows);
3377         printable = 1;
3378
3379         console_unlock();
3380
3381 #ifdef CONFIG_VT_CONSOLE
3382         register_console(&vt_console_driver);
3383 #endif
3384         return 0;
3385 }
3386 console_initcall(con_init);
3387
3388 static const struct tty_operations con_ops = {
3389         .install = con_install,
3390         .open = con_open,
3391         .close = con_close,
3392         .write = con_write,
3393         .write_room = con_write_room,
3394         .put_char = con_put_char,
3395         .flush_chars = con_flush_chars,
3396         .chars_in_buffer = con_chars_in_buffer,
3397         .ioctl = vt_ioctl,
3398 #ifdef CONFIG_COMPAT
3399         .compat_ioctl = vt_compat_ioctl,
3400 #endif
3401         .stop = con_stop,
3402         .start = con_start,
3403         .throttle = con_throttle,
3404         .unthrottle = con_unthrottle,
3405         .resize = vt_resize,
3406         .shutdown = con_shutdown
3407 };
3408
3409 static struct cdev vc0_cdev;
3410
3411 static ssize_t show_tty_active(struct device *dev,
3412                                 struct device_attribute *attr, char *buf)
3413 {
3414         return sprintf(buf, "tty%d\n", fg_console + 1);
3415 }
3416 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3417
3418 static struct attribute *vt_dev_attrs[] = {
3419         &dev_attr_active.attr,
3420         NULL
3421 };
3422
3423 ATTRIBUTE_GROUPS(vt_dev);
3424
3425 int __init vty_init(const struct file_operations *console_fops)
3426 {
3427         cdev_init(&vc0_cdev, console_fops);
3428         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3429             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3430                 panic("Couldn't register /dev/tty0 driver\n");
3431         tty0dev = device_create_with_groups(tty_class, NULL,
3432                                             MKDEV(TTY_MAJOR, 0), NULL,
3433                                             vt_dev_groups, "tty0");
3434         if (IS_ERR(tty0dev))
3435                 tty0dev = NULL;
3436
3437         vcs_init();
3438
3439         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3440         if (!console_driver)
3441                 panic("Couldn't allocate console driver\n");
3442
3443         console_driver->name = "tty";
3444         console_driver->name_base = 1;
3445         console_driver->major = TTY_MAJOR;
3446         console_driver->minor_start = 1;
3447         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3448         console_driver->init_termios = tty_std_termios;
3449         if (default_utf8)
3450                 console_driver->init_termios.c_iflag |= IUTF8;
3451         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3452         tty_set_operations(console_driver, &con_ops);
3453         if (tty_register_driver(console_driver))
3454                 panic("Couldn't register console driver\n");
3455         kbd_init();
3456         console_map_init();
3457 #ifdef CONFIG_MDA_CONSOLE
3458         mda_console_init();
3459 #endif
3460         return 0;
3461 }
3462
3463 #ifndef VT_SINGLE_DRIVER
3464
3465 static struct class *vtconsole_class;
3466
3467 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3468                            int deflt)
3469 {
3470         struct module *owner = csw->owner;
3471         const char *desc = NULL;
3472         struct con_driver *con_driver;
3473         int i, j = -1, k = -1, retval = -ENODEV;
3474
3475         if (!try_module_get(owner))
3476                 return -ENODEV;
3477
3478         WARN_CONSOLE_UNLOCKED();
3479
3480         /* check if driver is registered */
3481         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3482                 con_driver = &registered_con_driver[i];
3483
3484                 if (con_driver->con == csw) {
3485                         desc = con_driver->desc;
3486                         retval = 0;
3487                         break;
3488                 }
3489         }
3490
3491         if (retval)
3492                 goto err;
3493
3494         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3495                 csw->con_startup();
3496                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3497         }
3498
3499         if (deflt) {
3500                 if (conswitchp)
3501                         module_put(conswitchp->owner);
3502
3503                 __module_get(owner);
3504                 conswitchp = csw;
3505         }
3506
3507         first = max(first, con_driver->first);
3508         last = min(last, con_driver->last);
3509
3510         for (i = first; i <= last; i++) {
3511                 int old_was_color;
3512                 struct vc_data *vc = vc_cons[i].d;
3513
3514                 if (con_driver_map[i])
3515                         module_put(con_driver_map[i]->owner);
3516                 __module_get(owner);
3517                 con_driver_map[i] = csw;
3518
3519                 if (!vc || !vc->vc_sw)
3520                         continue;
3521
3522                 j = i;
3523
3524                 if (con_is_visible(vc)) {
3525                         k = i;
3526                         save_screen(vc);
3527                 }
3528
3529                 old_was_color = vc->vc_can_do_color;
3530                 vc->vc_sw->con_deinit(vc);
3531                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3532                 visual_init(vc, i, 0);
3533                 set_origin(vc);
3534                 update_attr(vc);
3535
3536                 /* If the console changed between mono <-> color, then
3537                  * the attributes in the screenbuf will be wrong.  The
3538                  * following resets all attributes to something sane.
3539                  */
3540                 if (old_was_color != vc->vc_can_do_color)
3541                         clear_buffer_attributes(vc);
3542         }
3543
3544         pr_info("Console: switching ");
3545         if (!deflt)
3546                 pr_cont("consoles %d-%d ", first + 1, last + 1);
3547         if (j >= 0) {
3548                 struct vc_data *vc = vc_cons[j].d;
3549
3550                 pr_cont("to %s %s %dx%d\n",
3551                         vc->vc_can_do_color ? "colour" : "mono",
3552                         desc, vc->vc_cols, vc->vc_rows);
3553
3554                 if (k >= 0) {
3555                         vc = vc_cons[k].d;
3556                         update_screen(vc);
3557                 }
3558         } else {
3559                 pr_cont("to %s\n", desc);
3560         }
3561
3562         retval = 0;
3563 err:
3564         module_put(owner);
3565         return retval;
3566 };
3567
3568
3569 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3570 /* unlocked version of unbind_con_driver() */
3571 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3572 {
3573         struct module *owner = csw->owner;
3574         const struct consw *defcsw = NULL;
3575         struct con_driver *con_driver = NULL, *con_back = NULL;
3576         int i, retval = -ENODEV;
3577
3578         if (!try_module_get(owner))
3579                 return -ENODEV;
3580
3581         WARN_CONSOLE_UNLOCKED();
3582
3583         /* check if driver is registered and if it is unbindable */
3584         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3585                 con_driver = &registered_con_driver[i];
3586
3587                 if (con_driver->con == csw &&
3588                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3589                         retval = 0;
3590                         break;
3591                 }
3592         }
3593
3594         if (retval)
3595                 goto err;
3596
3597         retval = -ENODEV;
3598
3599         /* check if backup driver exists */
3600         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3601                 con_back = &registered_con_driver[i];
3602
3603                 if (con_back->con && con_back->con != csw) {
3604                         defcsw = con_back->con;
3605                         retval = 0;
3606                         break;
3607                 }
3608         }
3609
3610         if (retval)
3611                 goto err;
3612
3613         if (!con_is_bound(csw))
3614                 goto err;
3615
3616         first = max(first, con_driver->first);
3617         last = min(last, con_driver->last);
3618
3619         for (i = first; i <= last; i++) {
3620                 if (con_driver_map[i] == csw) {
3621                         module_put(csw->owner);
3622                         con_driver_map[i] = NULL;
3623                 }
3624         }
3625
3626         if (!con_is_bound(defcsw)) {
3627                 const struct consw *defconsw = conswitchp;
3628
3629                 defcsw->con_startup();
3630                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3631                 /*
3632                  * vgacon may change the default driver to point
3633                  * to dummycon, we restore it here...
3634                  */
3635                 conswitchp = defconsw;
3636         }
3637
3638         if (!con_is_bound(csw))
3639                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3640
3641         /* ignore return value, binding should not fail */
3642         do_bind_con_driver(defcsw, first, last, deflt);
3643 err:
3644         module_put(owner);
3645         return retval;
3646
3647 }
3648 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3649
3650 static int vt_bind(struct con_driver *con)
3651 {
3652         const struct consw *defcsw = NULL, *csw = NULL;
3653         int i, more = 1, first = -1, last = -1, deflt = 0;
3654
3655         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3656                 goto err;
3657
3658         csw = con->con;
3659
3660         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3661                 struct con_driver *con = &registered_con_driver[i];
3662
3663                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3664                         defcsw = con->con;
3665                         break;
3666                 }
3667         }
3668
3669         if (!defcsw)
3670                 goto err;
3671
3672         while (more) {
3673                 more = 0;
3674
3675                 for (i = con->first; i <= con->last; i++) {
3676                         if (con_driver_map[i] == defcsw) {
3677                                 if (first == -1)
3678                                         first = i;
3679                                 last = i;
3680                                 more = 1;
3681                         } else if (first != -1)
3682                                 break;
3683                 }
3684
3685                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3686                         deflt = 1;
3687
3688                 if (first != -1)
3689                         do_bind_con_driver(csw, first, last, deflt);
3690
3691                 first = -1;
3692                 last = -1;
3693                 deflt = 0;
3694         }
3695
3696 err:
3697         return 0;
3698 }
3699
3700 static int vt_unbind(struct con_driver *con)
3701 {
3702         const struct consw *csw = NULL;
3703         int i, more = 1, first = -1, last = -1, deflt = 0;
3704         int ret;
3705
3706         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3707                 goto err;
3708
3709         csw = con->con;
3710
3711         while (more) {
3712                 more = 0;
3713
3714                 for (i = con->first; i <= con->last; i++) {
3715                         if (con_driver_map[i] == csw) {
3716                                 if (first == -1)
3717                                         first = i;
3718                                 last = i;
3719                                 more = 1;
3720                         } else if (first != -1)
3721                                 break;
3722                 }
3723
3724                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3725                         deflt = 1;
3726
3727                 if (first != -1) {
3728                         ret = do_unbind_con_driver(csw, first, last, deflt);
3729                         if (ret != 0)
3730                                 return ret;
3731                 }
3732
3733                 first = -1;
3734                 last = -1;
3735                 deflt = 0;
3736         }
3737
3738 err:
3739         return 0;
3740 }
3741 #else
3742 static inline int vt_bind(struct con_driver *con)
3743 {
3744         return 0;
3745 }
3746 static inline int vt_unbind(struct con_driver *con)
3747 {
3748         return 0;
3749 }
3750 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3751
3752 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3753                           const char *buf, size_t count)
3754 {
3755         struct con_driver *con = dev_get_drvdata(dev);
3756         int bind = simple_strtoul(buf, NULL, 0);
3757
3758         console_lock();
3759
3760         if (bind)
3761                 vt_bind(con);
3762         else
3763                 vt_unbind(con);
3764
3765         console_unlock();
3766
3767         return count;
3768 }
3769
3770 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3771                          char *buf)
3772 {
3773         struct con_driver *con = dev_get_drvdata(dev);
3774         int bind;
3775
3776         console_lock();
3777         bind = con_is_bound(con->con);
3778         console_unlock();
3779
3780         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3781 }
3782
3783 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3784                          char *buf)
3785 {
3786         struct con_driver *con = dev_get_drvdata(dev);
3787
3788         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3789                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3790                          con->desc);
3791
3792 }
3793
3794 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3795 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3796
3797 static struct attribute *con_dev_attrs[] = {
3798         &dev_attr_bind.attr,
3799         &dev_attr_name.attr,
3800         NULL
3801 };
3802
3803 ATTRIBUTE_GROUPS(con_dev);
3804
3805 static int vtconsole_init_device(struct con_driver *con)
3806 {
3807         con->flag |= CON_DRIVER_FLAG_ATTR;
3808         return 0;
3809 }
3810
3811 static void vtconsole_deinit_device(struct con_driver *con)
3812 {
3813         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3814 }
3815
3816 /**
3817  * con_is_bound - checks if driver is bound to the console
3818  * @csw: console driver
3819  *
3820  * RETURNS: zero if unbound, nonzero if bound
3821  *
3822  * Drivers can call this and if zero, they should release
3823  * all resources allocated on con_startup()
3824  */
3825 int con_is_bound(const struct consw *csw)
3826 {
3827         int i, bound = 0;
3828
3829         WARN_CONSOLE_UNLOCKED();
3830
3831         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3832                 if (con_driver_map[i] == csw) {
3833                         bound = 1;
3834                         break;
3835                 }
3836         }
3837
3838         return bound;
3839 }
3840 EXPORT_SYMBOL(con_is_bound);
3841
3842 /**
3843  * con_is_visible - checks whether the current console is visible
3844  * @vc: virtual console
3845  *
3846  * RETURNS: zero if not visible, nonzero if visible
3847  */
3848 bool con_is_visible(const struct vc_data *vc)
3849 {
3850         WARN_CONSOLE_UNLOCKED();
3851
3852         return *vc->vc_display_fg == vc;
3853 }
3854 EXPORT_SYMBOL(con_is_visible);
3855
3856 /**
3857  * con_debug_enter - prepare the console for the kernel debugger
3858  * @sw: console driver
3859  *
3860  * Called when the console is taken over by the kernel debugger, this
3861  * function needs to save the current console state, then put the console
3862  * into a state suitable for the kernel debugger.
3863  *
3864  * RETURNS:
3865  * Zero on success, nonzero if a failure occurred when trying to prepare
3866  * the console for the debugger.
3867  */
3868 int con_debug_enter(struct vc_data *vc)
3869 {
3870         int ret = 0;
3871
3872         saved_fg_console = fg_console;
3873         saved_last_console = last_console;
3874         saved_want_console = want_console;
3875         saved_vc_mode = vc->vc_mode;
3876         saved_console_blanked = console_blanked;
3877         vc->vc_mode = KD_TEXT;
3878         console_blanked = 0;
3879         if (vc->vc_sw->con_debug_enter)
3880                 ret = vc->vc_sw->con_debug_enter(vc);
3881 #ifdef CONFIG_KGDB_KDB
3882         /* Set the initial LINES variable if it is not already set */
3883         if (vc->vc_rows < 999) {
3884                 int linecount;
3885                 char lns[4];
3886                 const char *setargs[3] = {
3887                         "set",
3888                         "LINES",
3889                         lns,
3890                 };
3891                 if (kdbgetintenv(setargs[0], &linecount)) {
3892                         snprintf(lns, 4, "%i", vc->vc_rows);
3893                         kdb_set(2, setargs);
3894                 }
3895         }
3896         if (vc->vc_cols < 999) {
3897                 int colcount;
3898                 char cols[4];
3899                 const char *setargs[3] = {
3900                         "set",
3901                         "COLUMNS",
3902                         cols,
3903                 };
3904                 if (kdbgetintenv(setargs[0], &colcount)) {
3905                         snprintf(cols, 4, "%i", vc->vc_cols);
3906                         kdb_set(2, setargs);
3907                 }
3908         }
3909 #endif /* CONFIG_KGDB_KDB */
3910         return ret;
3911 }
3912 EXPORT_SYMBOL_GPL(con_debug_enter);
3913
3914 /**
3915  * con_debug_leave - restore console state
3916  * @sw: console driver
3917  *
3918  * Restore the console state to what it was before the kernel debugger
3919  * was invoked.
3920  *
3921  * RETURNS:
3922  * Zero on success, nonzero if a failure occurred when trying to restore
3923  * the console.
3924  */
3925 int con_debug_leave(void)
3926 {
3927         struct vc_data *vc;
3928         int ret = 0;
3929
3930         fg_console = saved_fg_console;
3931         last_console = saved_last_console;
3932         want_console = saved_want_console;
3933         console_blanked = saved_console_blanked;
3934         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3935
3936         vc = vc_cons[fg_console].d;
3937         if (vc->vc_sw->con_debug_leave)
3938                 ret = vc->vc_sw->con_debug_leave(vc);
3939         return ret;
3940 }
3941 EXPORT_SYMBOL_GPL(con_debug_leave);
3942
3943 static int do_register_con_driver(const struct consw *csw, int first, int last)
3944 {
3945         struct module *owner = csw->owner;
3946         struct con_driver *con_driver;
3947         const char *desc;
3948         int i, retval;
3949
3950         WARN_CONSOLE_UNLOCKED();
3951
3952         if (!try_module_get(owner))
3953                 return -ENODEV;
3954
3955         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3956                 con_driver = &registered_con_driver[i];
3957
3958                 /* already registered */
3959                 if (con_driver->con == csw) {
3960                         retval = -EBUSY;
3961                         goto err;
3962                 }
3963         }
3964
3965         desc = csw->con_startup();
3966         if (!desc) {
3967                 retval = -ENODEV;
3968                 goto err;
3969         }
3970
3971         retval = -EINVAL;
3972
3973         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3974                 con_driver = &registered_con_driver[i];
3975
3976                 if (con_driver->con == NULL &&
3977                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3978                         con_driver->con = csw;
3979                         con_driver->desc = desc;
3980                         con_driver->node = i;
3981                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3982                                            CON_DRIVER_FLAG_INIT;
3983                         con_driver->first = first;
3984                         con_driver->last = last;
3985                         retval = 0;
3986                         break;
3987                 }
3988         }
3989
3990         if (retval)
3991                 goto err;
3992
3993         con_driver->dev =
3994                 device_create_with_groups(vtconsole_class, NULL,
3995                                           MKDEV(0, con_driver->node),
3996                                           con_driver, con_dev_groups,
3997                                           "vtcon%i", con_driver->node);
3998         if (IS_ERR(con_driver->dev)) {
3999                 pr_warn("Unable to create device for %s; errno = %ld\n",
4000                         con_driver->desc, PTR_ERR(con_driver->dev));
4001                 con_driver->dev = NULL;
4002         } else {
4003                 vtconsole_init_device(con_driver);
4004         }
4005
4006 err:
4007         module_put(owner);
4008         return retval;
4009 }
4010
4011
4012 /**
4013  * do_unregister_con_driver - unregister console driver from console layer
4014  * @csw: console driver
4015  *
4016  * DESCRIPTION: All drivers that registers to the console layer must
4017  * call this function upon exit, or if the console driver is in a state
4018  * where it won't be able to handle console services, such as the
4019  * framebuffer console without loaded framebuffer drivers.
4020  *
4021  * The driver must unbind first prior to unregistration.
4022  */
4023 int do_unregister_con_driver(const struct consw *csw)
4024 {
4025         int i;
4026
4027         /* cannot unregister a bound driver */
4028         if (con_is_bound(csw))
4029                 return -EBUSY;
4030
4031         if (csw == conswitchp)
4032                 return -EINVAL;
4033
4034         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4035                 struct con_driver *con_driver = &registered_con_driver[i];
4036
4037                 if (con_driver->con == csw) {
4038                         /*
4039                          * Defer the removal of the sysfs entries since that
4040                          * will acquire the kernfs s_active lock and we can't
4041                          * acquire this lock while holding the console lock:
4042                          * the unbind sysfs entry imposes already the opposite
4043                          * order. Reset con already here to prevent any later
4044                          * lookup to succeed and mark this slot as zombie, so
4045                          * it won't get reused until we complete the removal
4046                          * in the deferred work.
4047                          */
4048                         con_driver->con = NULL;
4049                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4050                         schedule_work(&con_driver_unregister_work);
4051
4052                         return 0;
4053                 }
4054         }
4055
4056         return -ENODEV;
4057 }
4058 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4059
4060 static void con_driver_unregister_callback(struct work_struct *ignored)
4061 {
4062         int i;
4063
4064         console_lock();
4065
4066         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4067                 struct con_driver *con_driver = &registered_con_driver[i];
4068
4069                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4070                         continue;
4071
4072                 console_unlock();
4073
4074                 vtconsole_deinit_device(con_driver);
4075                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4076
4077                 console_lock();
4078
4079                 if (WARN_ON_ONCE(con_driver->con))
4080                         con_driver->con = NULL;
4081                 con_driver->desc = NULL;
4082                 con_driver->dev = NULL;
4083                 con_driver->node = 0;
4084                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4085                 con_driver->flag = 0;
4086                 con_driver->first = 0;
4087                 con_driver->last = 0;
4088         }
4089
4090         console_unlock();
4091 }
4092
4093 /*
4094  *      If we support more console drivers, this function is used
4095  *      when a driver wants to take over some existing consoles
4096  *      and become default driver for newly opened ones.
4097  *
4098  *      do_take_over_console is basically a register followed by unbind
4099  */
4100 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4101 {
4102         int err;
4103
4104         err = do_register_con_driver(csw, first, last);
4105         /*
4106          * If we get an busy error we still want to bind the console driver
4107          * and return success, as we may have unbound the console driver
4108          * but not unregistered it.
4109          */
4110         if (err == -EBUSY)
4111                 err = 0;
4112         if (!err)
4113                 do_bind_con_driver(csw, first, last, deflt);
4114
4115         return err;
4116 }
4117 EXPORT_SYMBOL_GPL(do_take_over_console);
4118
4119
4120 /*
4121  * give_up_console is a wrapper to unregister_con_driver. It will only
4122  * work if driver is fully unbound.
4123  */
4124 void give_up_console(const struct consw *csw)
4125 {
4126         console_lock();
4127         do_unregister_con_driver(csw);
4128         console_unlock();
4129 }
4130
4131 static int __init vtconsole_class_init(void)
4132 {
4133         int i;
4134
4135         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4136         if (IS_ERR(vtconsole_class)) {
4137                 pr_warn("Unable to create vt console class; errno = %ld\n",
4138                         PTR_ERR(vtconsole_class));
4139                 vtconsole_class = NULL;
4140         }
4141
4142         /* Add system drivers to sysfs */
4143         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4144                 struct con_driver *con = &registered_con_driver[i];
4145
4146                 if (con->con && !con->dev) {
4147                         con->dev =
4148                                 device_create_with_groups(vtconsole_class, NULL,
4149                                                           MKDEV(0, con->node),
4150                                                           con, con_dev_groups,
4151                                                           "vtcon%i", con->node);
4152
4153                         if (IS_ERR(con->dev)) {
4154                                 pr_warn("Unable to create device for %s; errno = %ld\n",
4155                                         con->desc, PTR_ERR(con->dev));
4156                                 con->dev = NULL;
4157                         } else {
4158                                 vtconsole_init_device(con);
4159                         }
4160                 }
4161         }
4162
4163         return 0;
4164 }
4165 postcore_initcall(vtconsole_class_init);
4166
4167 #endif
4168
4169 /*
4170  *      Screen blanking
4171  */
4172
4173 static int set_vesa_blanking(char __user *p)
4174 {
4175         unsigned int mode;
4176
4177         if (get_user(mode, p + 1))
4178                 return -EFAULT;
4179
4180         vesa_blank_mode = (mode < 4) ? mode : 0;
4181         return 0;
4182 }
4183
4184 void do_blank_screen(int entering_gfx)
4185 {
4186         struct vc_data *vc = vc_cons[fg_console].d;
4187         int i;
4188
4189         might_sleep();
4190
4191         WARN_CONSOLE_UNLOCKED();
4192
4193         if (console_blanked) {
4194                 if (blank_state == blank_vesa_wait) {
4195                         blank_state = blank_off;
4196                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4197                 }
4198                 return;
4199         }
4200
4201         /* entering graphics mode? */
4202         if (entering_gfx) {
4203                 hide_cursor(vc);
4204                 save_screen(vc);
4205                 vc->vc_sw->con_blank(vc, -1, 1);
4206                 console_blanked = fg_console + 1;
4207                 blank_state = blank_off;
4208                 set_origin(vc);
4209                 return;
4210         }
4211
4212         blank_state = blank_off;
4213
4214         /* don't blank graphics */
4215         if (vc->vc_mode != KD_TEXT) {
4216                 console_blanked = fg_console + 1;
4217                 return;
4218         }
4219
4220         hide_cursor(vc);
4221         del_timer_sync(&console_timer);
4222         blank_timer_expired = 0;
4223
4224         save_screen(vc);
4225         /* In case we need to reset origin, blanking hook returns 1 */
4226         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4227         console_blanked = fg_console + 1;
4228         if (i)
4229                 set_origin(vc);
4230
4231         if (console_blank_hook && console_blank_hook(1))
4232                 return;
4233
4234         if (vesa_off_interval && vesa_blank_mode) {
4235                 blank_state = blank_vesa_wait;
4236                 mod_timer(&console_timer, jiffies + vesa_off_interval);
4237         }
4238         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4239 }
4240 EXPORT_SYMBOL(do_blank_screen);
4241
4242 /*
4243  * Called by timer as well as from vt_console_driver
4244  */
4245 void do_unblank_screen(int leaving_gfx)
4246 {
4247         struct vc_data *vc;
4248
4249         /* This should now always be called from a "sane" (read: can schedule)
4250          * context for the sake of the low level drivers, except in the special
4251          * case of oops_in_progress
4252          */
4253         if (!oops_in_progress)
4254                 might_sleep();
4255
4256         WARN_CONSOLE_UNLOCKED();
4257
4258         ignore_poke = 0;
4259         if (!console_blanked)
4260                 return;
4261         if (!vc_cons_allocated(fg_console)) {
4262                 /* impossible */
4263                 pr_warn("unblank_screen: tty %d not allocated ??\n",
4264                         fg_console + 1);
4265                 return;
4266         }
4267         vc = vc_cons[fg_console].d;
4268         if (vc->vc_mode != KD_TEXT)
4269                 return; /* but leave console_blanked != 0 */
4270
4271         if (blankinterval) {
4272                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4273                 blank_state = blank_normal_wait;
4274         }
4275
4276         console_blanked = 0;
4277         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4278                 /* Low-level driver cannot restore -> do it ourselves */
4279                 update_screen(vc);
4280         if (console_blank_hook)
4281                 console_blank_hook(0);
4282         set_palette(vc);
4283         set_cursor(vc);
4284         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4285 }
4286 EXPORT_SYMBOL(do_unblank_screen);
4287
4288 /*
4289  * This is called by the outside world to cause a forced unblank, mostly for
4290  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4291  * call it with 1 as an argument and so force a mode restore... that may kill
4292  * X or at least garbage the screen but would also make the Oops visible...
4293  */
4294 void unblank_screen(void)
4295 {
4296         do_unblank_screen(0);
4297 }
4298
4299 /*
4300  * We defer the timer blanking to work queue so it can take the console mutex
4301  * (console operations can still happen at irq time, but only from printk which
4302  * has the console mutex. Not perfect yet, but better than no locking
4303  */
4304 static void blank_screen_t(struct timer_list *unused)
4305 {
4306         blank_timer_expired = 1;
4307         schedule_work(&console_work);
4308 }
4309
4310 void poke_blanked_console(void)
4311 {
4312         WARN_CONSOLE_UNLOCKED();
4313
4314         /* Add this so we quickly catch whoever might call us in a non
4315          * safe context. Nowadays, unblank_screen() isn't to be called in
4316          * atomic contexts and is allowed to schedule (with the special case
4317          * of oops_in_progress, but that isn't of any concern for this
4318          * function. --BenH.
4319          */
4320         might_sleep();
4321
4322         /* This isn't perfectly race free, but a race here would be mostly harmless,
4323          * at worse, we'll do a spurrious blank and it's unlikely
4324          */
4325         del_timer(&console_timer);
4326         blank_timer_expired = 0;
4327
4328         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4329                 return;
4330         if (console_blanked)
4331                 unblank_screen();
4332         else if (blankinterval) {
4333                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4334                 blank_state = blank_normal_wait;
4335         }
4336 }
4337
4338 /*
4339  *      Palettes
4340  */
4341
4342 static void set_palette(struct vc_data *vc)
4343 {
4344         WARN_CONSOLE_UNLOCKED();
4345
4346         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4347                 vc->vc_sw->con_set_palette(vc, color_table);
4348 }
4349
4350 /*
4351  * Load palette into the DAC registers. arg points to a colour
4352  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4353  */
4354
4355 int con_set_cmap(unsigned char __user *arg)
4356 {
4357         int i, j, k;
4358         unsigned char colormap[3*16];
4359
4360         if (copy_from_user(colormap, arg, sizeof(colormap)))
4361                 return -EFAULT;
4362
4363         console_lock();
4364         for (i = k = 0; i < 16; i++) {
4365                 default_red[i] = colormap[k++];
4366                 default_grn[i] = colormap[k++];
4367                 default_blu[i] = colormap[k++];
4368         }
4369         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4370                 if (!vc_cons_allocated(i))
4371                         continue;
4372                 for (j = k = 0; j < 16; j++) {
4373                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4374                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4375                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4376                 }
4377                 set_palette(vc_cons[i].d);
4378         }
4379         console_unlock();
4380
4381         return 0;
4382 }
4383
4384 int con_get_cmap(unsigned char __user *arg)
4385 {
4386         int i, k;
4387         unsigned char colormap[3*16];
4388
4389         console_lock();
4390         for (i = k = 0; i < 16; i++) {
4391                 colormap[k++] = default_red[i];
4392                 colormap[k++] = default_grn[i];
4393                 colormap[k++] = default_blu[i];
4394         }
4395         console_unlock();
4396
4397         if (copy_to_user(arg, colormap, sizeof(colormap)))
4398                 return -EFAULT;
4399
4400         return 0;
4401 }
4402
4403 void reset_palette(struct vc_data *vc)
4404 {
4405         int j, k;
4406         for (j=k=0; j<16; j++) {
4407                 vc->vc_palette[k++] = default_red[j];
4408                 vc->vc_palette[k++] = default_grn[j];
4409                 vc->vc_palette[k++] = default_blu[j];
4410         }
4411         set_palette(vc);
4412 }
4413
4414 /*
4415  *  Font switching
4416  *
4417  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4418  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4419  *  depending on width) reserved for each character which is kinda wasty, but
4420  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4421  *  is up to the actual low-level console-driver convert data into its favorite
4422  *  format (maybe we should add a `fontoffset' field to the `display'
4423  *  structure so we won't have to convert the fontdata all the time.
4424  *  /Jes
4425  */
4426
4427 #define max_font_size 65536
4428
4429 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4430 {
4431         struct console_font font;
4432         int rc = -EINVAL;
4433         int c;
4434
4435         if (op->data) {
4436                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4437                 if (!font.data)
4438                         return -ENOMEM;
4439         } else
4440                 font.data = NULL;
4441
4442         console_lock();
4443         if (vc->vc_mode != KD_TEXT)
4444                 rc = -EINVAL;
4445         else if (vc->vc_sw->con_font_get)
4446                 rc = vc->vc_sw->con_font_get(vc, &font);
4447         else
4448                 rc = -ENOSYS;
4449         console_unlock();
4450
4451         if (rc)
4452                 goto out;
4453
4454         c = (font.width+7)/8 * 32 * font.charcount;
4455
4456         if (op->data && font.charcount > op->charcount)
4457                 rc = -ENOSPC;
4458         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4459                 if (font.width > op->width || font.height > op->height)
4460                         rc = -ENOSPC;
4461         } else {
4462                 if (font.width != 8)
4463                         rc = -EIO;
4464                 else if ((op->height && font.height > op->height) ||
4465                          font.height > 32)
4466                         rc = -ENOSPC;
4467         }
4468         if (rc)
4469                 goto out;
4470
4471         op->height = font.height;
4472         op->width = font.width;
4473         op->charcount = font.charcount;
4474
4475         if (op->data && copy_to_user(op->data, font.data, c))
4476                 rc = -EFAULT;
4477
4478 out:
4479         kfree(font.data);
4480         return rc;
4481 }
4482
4483 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4484 {
4485         struct console_font font;
4486         int rc = -EINVAL;
4487         int size;
4488
4489         if (vc->vc_mode != KD_TEXT)
4490                 return -EINVAL;
4491         if (!op->data)
4492                 return -EINVAL;
4493         if (op->charcount > 512)
4494                 return -EINVAL;
4495         if (op->width <= 0 || op->width > 32 || op->height > 32)
4496                 return -EINVAL;
4497         size = (op->width+7)/8 * 32 * op->charcount;
4498         if (size > max_font_size)
4499                 return -ENOSPC;
4500
4501         font.data = memdup_user(op->data, size);
4502         if (IS_ERR(font.data))
4503                 return PTR_ERR(font.data);
4504
4505         if (!op->height) {              /* Need to guess font height [compat] */
4506                 int h, i;
4507                 u8 *charmap = font.data;
4508
4509                 /*
4510                  * If from KDFONTOP ioctl, don't allow things which can be done
4511                  * in userland,so that we can get rid of this soon
4512                  */
4513                 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4514                         kfree(font.data);
4515                         return -EINVAL;
4516                 }
4517
4518                 for (h = 32; h > 0; h--)
4519                         for (i = 0; i < op->charcount; i++)
4520                                 if (charmap[32*i+h-1])
4521                                         goto nonzero;
4522
4523                 kfree(font.data);
4524                 return -EINVAL;
4525
4526         nonzero:
4527                 op->height = h;
4528         }
4529
4530         font.charcount = op->charcount;
4531         font.width = op->width;
4532         font.height = op->height;
4533
4534         console_lock();
4535         if (vc->vc_mode != KD_TEXT)
4536                 rc = -EINVAL;
4537         else if (vc->vc_sw->con_font_set)
4538                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4539         else
4540                 rc = -ENOSYS;
4541         console_unlock();
4542         kfree(font.data);
4543         return rc;
4544 }
4545
4546 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4547 {
4548         struct console_font font = {.width = op->width, .height = op->height};
4549         char name[MAX_FONT_NAME];
4550         char *s = name;
4551         int rc;
4552
4553
4554         if (!op->data)
4555                 s = NULL;
4556         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4557                 return -EFAULT;
4558         else
4559                 name[MAX_FONT_NAME - 1] = 0;
4560
4561         console_lock();
4562         if (vc->vc_mode != KD_TEXT) {
4563                 console_unlock();
4564                 return -EINVAL;
4565         }
4566         if (vc->vc_sw->con_font_default)
4567                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4568         else
4569                 rc = -ENOSYS;
4570         console_unlock();
4571         if (!rc) {
4572                 op->width = font.width;
4573                 op->height = font.height;
4574         }
4575         return rc;
4576 }
4577
4578 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4579 {
4580         int con = op->height;
4581         int rc;
4582
4583
4584         console_lock();
4585         if (vc->vc_mode != KD_TEXT)
4586                 rc = -EINVAL;
4587         else if (!vc->vc_sw->con_font_copy)
4588                 rc = -ENOSYS;
4589         else if (con < 0 || !vc_cons_allocated(con))
4590                 rc = -ENOTTY;
4591         else if (con == vc->vc_num)     /* nothing to do */
4592                 rc = 0;
4593         else
4594                 rc = vc->vc_sw->con_font_copy(vc, con);
4595         console_unlock();
4596         return rc;
4597 }
4598
4599 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4600 {
4601         switch (op->op) {
4602         case KD_FONT_OP_SET:
4603                 return con_font_set(vc, op);
4604         case KD_FONT_OP_GET:
4605                 return con_font_get(vc, op);
4606         case KD_FONT_OP_SET_DEFAULT:
4607                 return con_font_default(vc, op);
4608         case KD_FONT_OP_COPY:
4609                 return con_font_copy(vc, op);
4610         }
4611         return -ENOSYS;
4612 }
4613
4614 /*
4615  *      Interface exported to selection and vcs.
4616  */
4617
4618 /* used by selection */
4619 u16 screen_glyph(struct vc_data *vc, int offset)
4620 {
4621         u16 w = scr_readw(screenpos(vc, offset, 1));
4622         u16 c = w & 0xff;
4623
4624         if (w & vc->vc_hi_font_mask)
4625                 c |= 0x100;
4626         return c;
4627 }
4628 EXPORT_SYMBOL_GPL(screen_glyph);
4629
4630 u32 screen_glyph_unicode(struct vc_data *vc, int n)
4631 {
4632         struct uni_screen *uniscr = get_vc_uniscr(vc);
4633
4634         if (uniscr)
4635                 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4636         return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4637 }
4638 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4639
4640 /* used by vcs - note the word offset */
4641 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4642 {
4643         return screenpos(vc, 2 * w_offset, viewed);
4644 }
4645 EXPORT_SYMBOL_GPL(screen_pos);
4646
4647 void getconsxy(struct vc_data *vc, unsigned char *p)
4648 {
4649         /* clamp values if they don't fit */
4650         p[0] = min(vc->vc_x, 0xFFu);
4651         p[1] = min(vc->vc_y, 0xFFu);
4652 }
4653
4654 void putconsxy(struct vc_data *vc, unsigned char *p)
4655 {
4656         hide_cursor(vc);
4657         gotoxy(vc, p[0], p[1]);
4658         set_cursor(vc);
4659 }
4660
4661 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4662 {
4663         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4664                 return softcursor_original;
4665         return scr_readw(org);
4666 }
4667
4668 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4669 {
4670         scr_writew(val, org);
4671         if ((unsigned long)org == vc->vc_pos) {
4672                 softcursor_original = -1;
4673                 add_softcursor(vc);
4674         }
4675 }
4676
4677 void vcs_scr_updated(struct vc_data *vc)
4678 {
4679         notify_update(vc);
4680 }
4681
4682 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4683                 unsigned int rolled_over, void *base, unsigned int size)
4684 {
4685         unsigned long ubase = (unsigned long)base;
4686         ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4687         ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4688         ptrdiff_t origin = (void *)c->vc_origin - base;
4689         int margin = c->vc_size_row * 4;
4690         int from, wrap, from_off, avail;
4691
4692         /* Turn scrollback off */
4693         if (!lines) {
4694                 c->vc_visible_origin = c->vc_origin;
4695                 return;
4696         }
4697
4698         /* Do we have already enough to allow jumping from 0 to the end? */
4699         if (rolled_over > scr_end + margin) {
4700                 from = scr_end;
4701                 wrap = rolled_over + c->vc_size_row;
4702         } else {
4703                 from = 0;
4704                 wrap = size;
4705         }
4706
4707         from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4708         avail = (origin - from + wrap) % wrap;
4709
4710         /* Only a little piece would be left? Show all incl. the piece! */
4711         if (avail < 2 * margin)
4712                 margin = 0;
4713         if (from_off < margin)
4714                 from_off = 0;
4715         if (from_off > avail - margin)
4716                 from_off = avail;
4717
4718         c->vc_visible_origin = ubase + (from + from_off) % wrap;
4719 }
4720 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4721
4722 /*
4723  *      Visible symbols for modules
4724  */
4725
4726 EXPORT_SYMBOL(color_table);
4727 EXPORT_SYMBOL(default_red);
4728 EXPORT_SYMBOL(default_grn);
4729 EXPORT_SYMBOL(default_blu);
4730 EXPORT_SYMBOL(update_region);
4731 EXPORT_SYMBOL(redraw_screen);
4732 EXPORT_SYMBOL(vc_resize);
4733 EXPORT_SYMBOL(fg_console);
4734 EXPORT_SYMBOL(console_blank_hook);
4735 EXPORT_SYMBOL(console_blanked);
4736 EXPORT_SYMBOL(vc_cons);
4737 EXPORT_SYMBOL(global_cursor_default);
4738 #ifndef VT_SINGLE_DRIVER
4739 EXPORT_SYMBOL(give_up_console);
4740 #endif