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 if (con_is_visible(vc)) {
 942                 /*
 943                  * When no con_flush_scrollback method is provided then the
 944                  * legacy way for flushing the scrollback buffer is to use
 945                  * a side effect of the con_switch method. We do it only on
 946                  * the foreground console as background consoles have no
 947                  * scrollback buffers in that case and we obviously don't
 948                  * want to switch to them.
 949                  */
 950                 hide_cursor(vc);
 951                 vc->vc_sw->con_switch(vc);
 952                 set_cursor(vc);
 953         }
 954 }
 955
 956 /*
 957  *      Redrawing of screen
 958  */
 959
 960 void clear_buffer_attributes(struct vc_data *vc)
 961 {
 962         unsigned short *p = (unsigned short *)vc->vc_origin;
 963         int count = vc->vc_screenbuf_size / 2;
 964         int mask = vc->vc_hi_font_mask | 0xff;
 965
 966         for (; count > 0; count--, p++) {
 967                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 968         }
 969 }
 970
 971 void redraw_screen(struct vc_data *vc, int is_switch)
 972 {
 973         int redraw = 0;
 974
 975         WARN_CONSOLE_UNLOCKED();
 976
 977         if (!vc) {
 978                 /* strange ... */
 979                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 980                 return;
 981         }
 982
 983         if (is_switch) {
 984                 struct vc_data *old_vc = vc_cons[fg_console].d;
 985                 if (old_vc == vc)
 986                         return;
 987                 if (!con_is_visible(vc))
 988                         redraw = 1;
 989                 *vc->vc_display_fg = vc;
 990                 fg_console = vc->vc_num;
 991                 hide_cursor(old_vc);
 992                 if (!con_is_visible(old_vc)) {
 993                         save_screen(old_vc);
 994                         set_origin(old_vc);
 995                 }
 996                 if (tty0dev)
 997                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 998         } else {
 999                 hide_cursor(vc);
1000                 redraw = 1;
1001         }
1002
1003         if (redraw) {
1004                 int update;
1005                 int old_was_color = vc->vc_can_do_color;
1006
1007                 set_origin(vc);
1008                 update = vc->vc_sw->con_switch(vc);
1009                 set_palette(vc);
1010                 /*
1011                  * If console changed from mono<->color, the best we can do
1012                  * is to clear the buffer attributes. As it currently stands,
1013                  * rebuilding new attributes from the old buffer is not doable
1014                  * without overly complex code.
1015                  */
1016                 if (old_was_color != vc->vc_can_do_color) {
1017                         update_attr(vc);
1018                         clear_buffer_attributes(vc);
1019                 }
1020
1021                 if (update && vc->vc_mode != KD_GRAPHICS)
1022                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1023         }
1024         set_cursor(vc);
1025         if (is_switch) {
1026                 set_leds();
1027                 compute_shiftstate();
1028                 notify_update(vc);
1029         }
1030 }
1031
1032 /*
1033  *      Allocation, freeing and resizing of VTs.
1034  */
1035
1036 int vc_cons_allocated(unsigned int i)
1037 {
1038         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1039 }
1040
1041 static void visual_init(struct vc_data *vc, int num, int init)
1042 {
1043         /* ++Geert: vc->vc_sw->con_init determines console size */
1044         if (vc->vc_sw)
1045                 module_put(vc->vc_sw->owner);
1046         vc->vc_sw = conswitchp;
1047 #ifndef VT_SINGLE_DRIVER
1048         if (con_driver_map[num])
1049                 vc->vc_sw = con_driver_map[num];
1050 #endif
1051         __module_get(vc->vc_sw->owner);
1052         vc->vc_num = num;
1053         vc->vc_display_fg = &master_display_fg;
1054         if (vc->vc_uni_pagedir_loc)
1055                 con_free_unimap(vc);
1056         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1057         vc->vc_uni_pagedir = NULL;
1058         vc->vc_hi_font_mask = 0;
1059         vc->vc_complement_mask = 0;
1060         vc->vc_can_do_color = 0;
1061         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1062         vc->vc_sw->con_init(vc, init);
1063         if (!vc->vc_complement_mask)
1064                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1065         vc->vc_s_complement_mask = vc->vc_complement_mask;
1066         vc->vc_size_row = vc->vc_cols << 1;
1067         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1068 }
1069
1070
1071 static void visual_deinit(struct vc_data *vc)
1072 {
1073         vc->vc_sw->con_deinit(vc);
1074         module_put(vc->vc_sw->owner);
1075 }
1076
1077 int vc_allocate(unsigned int currcons)  /* return 0 on success */
1078 {
1079         struct vt_notifier_param param;
1080         struct vc_data *vc;
1081
1082         WARN_CONSOLE_UNLOCKED();
1083
1084         if (currcons >= MAX_NR_CONSOLES)
1085                 return -ENXIO;
1086
1087         if (vc_cons[currcons].d)
1088                 return 0;
1089
1090         /* due to the granularity of kmalloc, we waste some memory here */
1091         /* the alloc is done in two steps, to optimize the common situation
1092            of a 25x80 console (structsize=216, screenbuf_size=4000) */
1093         /* although the numbers above are not valid since long ago, the
1094            point is still up-to-date and the comment still has its value
1095            even if only as a historical artifact.  --mj, July 1998 */
1096         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1097         if (!vc)
1098                 return -ENOMEM;
1099
1100         vc_cons[currcons].d = vc;
1101         tty_port_init(&vc->port);
1102         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1103
1104         visual_init(vc, currcons, 1);
1105
1106         if (!*vc->vc_uni_pagedir_loc)
1107                 con_set_default_unimap(vc);
1108
1109         vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1110         if (!vc->vc_screenbuf)
1111                 goto err_free;
1112
1113         /* If no drivers have overridden us and the user didn't pass a
1114            boot option, default to displaying the cursor */
1115         if (global_cursor_default == -1)
1116                 global_cursor_default = 1;
1117
1118         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1119         vcs_make_sysfs(currcons);
1120         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1121
1122         return 0;
1123 err_free:
1124         visual_deinit(vc);
1125         kfree(vc);
1126         vc_cons[currcons].d = NULL;
1127         return -ENOMEM;
1128 }
1129
1130 static inline int resize_screen(struct vc_data *vc, int width, int height,
1131                                 int user)
1132 {
1133         /* Resizes the resolution of the display adapater */
1134         int err = 0;
1135
1136         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1137                 err = vc->vc_sw->con_resize(vc, width, height, user);
1138
1139         return err;
1140 }
1141
1142 /*
1143  * Change # of rows and columns (0 means unchanged/the size of fg_console)
1144  * [this is to be used together with some user program
1145  * like resize that changes the hardware videomode]
1146  */
1147 #define VC_RESIZE_MAXCOL (32767)
1148 #define VC_RESIZE_MAXROW (32767)
1149
1150 /**
1151  *      vc_do_resize    -       resizing method for the tty
1152  *      @tty: tty being resized
1153  *      @real_tty: real tty (different to tty if a pty/tty pair)
1154  *      @vc: virtual console private data
1155  *      @cols: columns
1156  *      @lines: lines
1157  *
1158  *      Resize a virtual console, clipping according to the actual constraints.
1159  *      If the caller passes a tty structure then update the termios winsize
1160  *      information and perform any necessary signal handling.
1161  *
1162  *      Caller must hold the console semaphore. Takes the termios rwsem and
1163  *      ctrl_lock of the tty IFF a tty is passed.
1164  */
1165
1166 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1167                                 unsigned int cols, unsigned int lines)
1168 {
1169         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1170         unsigned long end;
1171         unsigned int old_rows, old_row_size, first_copied_row;
1172         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1173         unsigned int user;
1174         unsigned short *newscreen;
1175         struct uni_screen *new_uniscr = NULL;
1176
1177         WARN_CONSOLE_UNLOCKED();
1178
1179         if (!vc)
1180                 return -ENXIO;
1181
1182         user = vc->vc_resize_user;
1183         vc->vc_resize_user = 0;
1184
1185         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1186                 return -EINVAL;
1187
1188         new_cols = (cols ? cols : vc->vc_cols);
1189         new_rows = (lines ? lines : vc->vc_rows);
1190         new_row_size = new_cols << 1;
1191         new_screen_size = new_row_size * new_rows;
1192
1193         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1194                 return 0;
1195
1196         if (new_screen_size > (4 << 20))
1197                 return -EINVAL;
1198         newscreen = kzalloc(new_screen_size, GFP_USER);
1199         if (!newscreen)
1200                 return -ENOMEM;
1201
1202         if (get_vc_uniscr(vc)) {
1203                 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1204                 if (!new_uniscr) {
1205                         kfree(newscreen);
1206                         return -ENOMEM;
1207                 }
1208         }
1209
1210         if (vc == sel_cons)
1211                 clear_selection();
1212
1213         old_rows = vc->vc_rows;
1214         old_row_size = vc->vc_size_row;
1215
1216         err = resize_screen(vc, new_cols, new_rows, user);
1217         if (err) {
1218                 kfree(newscreen);
1219                 kfree(new_uniscr);
1220                 return err;
1221         }
1222
1223         vc->vc_rows = new_rows;
1224         vc->vc_cols = new_cols;
1225         vc->vc_size_row = new_row_size;
1226         vc->vc_screenbuf_size = new_screen_size;
1227
1228         rlth = min(old_row_size, new_row_size);
1229         rrem = new_row_size - rlth;
1230         old_origin = vc->vc_origin;
1231         new_origin = (long) newscreen;
1232         new_scr_end = new_origin + new_screen_size;
1233
1234         if (vc->vc_y > new_rows) {
1235                 if (old_rows - vc->vc_y < new_rows) {
1236                         /*
1237                          * Cursor near the bottom, copy contents from the
1238                          * bottom of buffer
1239                          */
1240                         first_copied_row = (old_rows - new_rows);
1241                 } else {
1242                         /*
1243                          * Cursor is in no man's land, copy 1/2 screenful
1244                          * from the top and bottom of cursor position
1245                          */
1246                         first_copied_row = (vc->vc_y - new_rows/2);
1247                 }
1248                 old_origin += first_copied_row * old_row_size;
1249         } else
1250                 first_copied_row = 0;
1251         end = old_origin + old_row_size * min(old_rows, new_rows);
1252
1253         vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1254                             get_vc_uniscr(vc), rlth/2, first_copied_row,
1255                             min(old_rows, new_rows));
1256         vc_uniscr_set(vc, new_uniscr);
1257
1258         update_attr(vc);
1259
1260         while (old_origin < end) {
1261                 scr_memcpyw((unsigned short *) new_origin,
1262                             (unsigned short *) old_origin, rlth);
1263                 if (rrem)
1264                         scr_memsetw((void *)(new_origin + rlth),
1265                                     vc->vc_video_erase_char, rrem);
1266                 old_origin += old_row_size;
1267                 new_origin += new_row_size;
1268         }
1269         if (new_scr_end > new_origin)
1270                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1271                             new_scr_end - new_origin);
1272         kfree(vc->vc_screenbuf);
1273         vc->vc_screenbuf = newscreen;
1274         vc->vc_screenbuf_size = new_screen_size;
1275         set_origin(vc);
1276
1277         /* do part of a reset_terminal() */
1278         vc->vc_top = 0;
1279         vc->vc_bottom = vc->vc_rows;
1280         gotoxy(vc, vc->vc_x, vc->vc_y);
1281         save_cur(vc);
1282
1283         if (tty) {
1284                 /* Rewrite the requested winsize data with the actual
1285                    resulting sizes */
1286                 struct winsize ws;
1287                 memset(&ws, 0, sizeof(ws));
1288                 ws.ws_row = vc->vc_rows;
1289                 ws.ws_col = vc->vc_cols;
1290                 ws.ws_ypixel = vc->vc_scan_lines;
1291                 tty_do_resize(tty, &ws);
1292         }
1293
1294         if (con_is_visible(vc))
1295                 update_screen(vc);
1296         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1297         notify_update(vc);
1298         return err;
1299 }
1300
1301 /**
1302  *      vc_resize               -       resize a VT
1303  *      @vc: virtual console
1304  *      @cols: columns
1305  *      @rows: rows
1306  *
1307  *      Resize a virtual console as seen from the console end of things. We
1308  *      use the common vc_do_resize methods to update the structures. The
1309  *      caller must hold the console sem to protect console internals and
1310  *      vc->port.tty
1311  */
1312
1313 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1314 {
1315         return vc_do_resize(vc->port.tty, vc, cols, rows);
1316 }
1317
1318 /**
1319  *      vt_resize               -       resize a VT
1320  *      @tty: tty to resize
1321  *      @ws: winsize attributes
1322  *
1323  *      Resize a virtual terminal. This is called by the tty layer as we
1324  *      register our own handler for resizing. The mutual helper does all
1325  *      the actual work.
1326  *
1327  *      Takes the console sem and the called methods then take the tty
1328  *      termios_rwsem and the tty ctrl_lock in that order.
1329  */
1330 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1331 {
1332         struct vc_data *vc = tty->driver_data;
1333         int ret;
1334
1335         console_lock();
1336         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1337         console_unlock();
1338         return ret;
1339 }
1340
1341 struct vc_data *vc_deallocate(unsigned int currcons)
1342 {
1343         struct vc_data *vc = NULL;
1344
1345         WARN_CONSOLE_UNLOCKED();
1346
1347         if (vc_cons_allocated(currcons)) {
1348                 struct vt_notifier_param param;
1349
1350                 param.vc = vc = vc_cons[currcons].d;
1351                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1352                 vcs_remove_sysfs(currcons);
1353                 visual_deinit(vc);
1354                 put_pid(vc->vt_pid);
1355                 vc_uniscr_set(vc, NULL);
1356                 kfree(vc->vc_screenbuf);
1357                 vc_cons[currcons].d = NULL;
1358         }
1359         return vc;
1360 }
1361
1362 /*
1363  *      VT102 emulator
1364  */
1365
1366 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1367
1368 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1369 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1370 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1371
1372 #define decarm          VC_REPEAT
1373 #define decckm          VC_CKMODE
1374 #define kbdapplic       VC_APPLIC
1375 #define lnm             VC_CRLF
1376
1377 /*
1378  * this is what the terminal answers to a ESC-Z or csi0c query.
1379  */
1380 #define VT100ID "\033[?1;2c"
1381 #define VT102ID "\033[?6c"
1382
1383 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1384                                        8,12,10,14, 9,13,11,15 };
1385
1386 /* the default colour table, for VGA+ colour systems */
1387 unsigned char default_red[] = {
1388         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1389         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1390 };
1391 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1392
1393 unsigned char default_grn[] = {
1394         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1395         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1396 };
1397 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1398
1399 unsigned char default_blu[] = {
1400         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1401         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1402 };
1403 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1404
1405 /*
1406  * gotoxy() must verify all boundaries, because the arguments
1407  * might also be negative. If the given position is out of
1408  * bounds, the cursor is placed at the nearest margin.
1409  */
1410 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1411 {
1412         int min_y, max_y;
1413
1414         if (new_x < 0)
1415                 vc->vc_x = 0;
1416         else {
1417                 if (new_x >= vc->vc_cols)
1418                         vc->vc_x = vc->vc_cols - 1;
1419                 else
1420                         vc->vc_x = new_x;
1421         }
1422
1423         if (vc->vc_decom) {
1424                 min_y = vc->vc_top;
1425                 max_y = vc->vc_bottom;
1426         } else {
1427                 min_y = 0;
1428                 max_y = vc->vc_rows;
1429         }
1430         if (new_y < min_y)
1431                 vc->vc_y = min_y;
1432         else if (new_y >= max_y)
1433                 vc->vc_y = max_y - 1;
1434         else
1435                 vc->vc_y = new_y;
1436         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1437         vc->vc_need_wrap = 0;
1438 }
1439
1440 /* for absolute user moves, when decom is set */
1441 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1442 {
1443         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1444 }
1445
1446 void scrollback(struct vc_data *vc)
1447 {
1448         scrolldelta(-(vc->vc_rows / 2));
1449 }
1450
1451 void scrollfront(struct vc_data *vc, int lines)
1452 {
1453         if (!lines)
1454                 lines = vc->vc_rows / 2;
1455         scrolldelta(lines);
1456 }
1457
1458 static void lf(struct vc_data *vc)
1459 {
1460         /* don't scroll if above bottom of scrolling region, or
1461          * if below scrolling region
1462          */
1463         if (vc->vc_y + 1 == vc->vc_bottom)
1464                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1465         else if (vc->vc_y < vc->vc_rows - 1) {
1466                 vc->vc_y++;
1467                 vc->vc_pos += vc->vc_size_row;
1468         }
1469         vc->vc_need_wrap = 0;
1470         notify_write(vc, '\n');
1471 }
1472
1473 static void ri(struct vc_data *vc)
1474 {
1475         /* don't scroll if below top of scrolling region, or
1476          * if above scrolling region
1477          */
1478         if (vc->vc_y == vc->vc_top)
1479                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1480         else if (vc->vc_y > 0) {
1481                 vc->vc_y--;
1482                 vc->vc_pos -= vc->vc_size_row;
1483         }
1484         vc->vc_need_wrap = 0;
1485 }
1486
1487 static inline void cr(struct vc_data *vc)
1488 {
1489         vc->vc_pos -= vc->vc_x << 1;
1490         vc->vc_need_wrap = vc->vc_x = 0;
1491         notify_write(vc, '\r');
1492 }
1493
1494 static inline void bs(struct vc_data *vc)
1495 {
1496         if (vc->vc_x) {
1497                 vc->vc_pos -= 2;
1498                 vc->vc_x--;
1499                 vc->vc_need_wrap = 0;
1500                 notify_write(vc, '\b');
1501         }
1502 }
1503
1504 static inline void del(struct vc_data *vc)
1505 {
1506         /* ignored */
1507 }
1508
1509 static void csi_J(struct vc_data *vc, int vpar)
1510 {
1511         unsigned int count;
1512         unsigned short * start;
1513
1514         switch (vpar) {
1515                 case 0: /* erase from cursor to end of display */
1516                         vc_uniscr_clear_line(vc, vc->vc_x,
1517                                              vc->vc_cols - vc->vc_x);
1518                         vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1519                                               vc->vc_rows - vc->vc_y - 1);
1520                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1521                         start = (unsigned short *)vc->vc_pos;
1522                         break;
1523                 case 1: /* erase from start to cursor */
1524                         vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1525                         vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1526                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1527                         start = (unsigned short *)vc->vc_origin;
1528                         break;
1529                 case 3: /* include scrollback */
1530                         flush_scrollback(vc);
1531                         /* fallthrough */
1532                 case 2: /* erase whole display */
1533                         vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1534                         count = vc->vc_cols * vc->vc_rows;
1535                         start = (unsigned short *)vc->vc_origin;
1536                         break;
1537                 default:
1538                         return;
1539         }
1540         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1541         if (con_should_update(vc))
1542                 do_update_region(vc, (unsigned long) start, count);
1543         vc->vc_need_wrap = 0;
1544 }
1545
1546 static void csi_K(struct vc_data *vc, int vpar)
1547 {
1548         unsigned int count;
1549         unsigned short *start = (unsigned short *)vc->vc_pos;
1550         int offset;
1551
1552         switch (vpar) {
1553                 case 0: /* erase from cursor to end of line */
1554                         offset = 0;
1555                         count = vc->vc_cols - vc->vc_x;
1556                         break;
1557                 case 1: /* erase from start of line to cursor */
1558                         offset = -vc->vc_x;
1559                         count = vc->vc_x + 1;
1560                         break;
1561                 case 2: /* erase whole line */
1562                         offset = -vc->vc_x;
1563                         count = vc->vc_cols;
1564                         break;
1565                 default:
1566                         return;
1567         }
1568         vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1569         scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1570         vc->vc_need_wrap = 0;
1571         if (con_should_update(vc))
1572                 do_update_region(vc, (unsigned long)(start + offset), count);
1573 }
1574
1575 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1576 {                                         /* not vt100? */
1577         int count;
1578
1579         if (!vpar)
1580                 vpar++;
1581         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1582
1583         vc_uniscr_clear_line(vc, vc->vc_x, count);
1584         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1585         if (con_should_update(vc))
1586                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1587         vc->vc_need_wrap = 0;
1588 }
1589
1590 static void default_attr(struct vc_data *vc)
1591 {
1592         vc->vc_intensity = 1;
1593         vc->vc_italic = 0;
1594         vc->vc_underline = 0;
1595         vc->vc_reverse = 0;
1596         vc->vc_blink = 0;
1597         vc->vc_color = vc->vc_def_color;
1598 }
1599
1600 struct rgb { u8 r; u8 g; u8 b; };
1601
1602 static void rgb_from_256(int i, struct rgb *c)
1603 {
1604         if (i < 8) {            /* Standard colours. */
1605                 c->r = i&1 ? 0xaa : 0x00;
1606                 c->g = i&2 ? 0xaa : 0x00;
1607                 c->b = i&4 ? 0xaa : 0x00;
1608         } else if (i < 16) {
1609                 c->r = i&1 ? 0xff : 0x55;
1610                 c->g = i&2 ? 0xff : 0x55;
1611                 c->b = i&4 ? 0xff : 0x55;
1612         } else if (i < 232) {   /* 6x6x6 colour cube. */
1613                 c->r = (i - 16) / 36 * 85 / 2;
1614                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1615                 c->b = (i - 16) % 6 * 85 / 2;
1616         } else                  /* Grayscale ramp. */
1617                 c->r = c->g = c->b = i * 10 - 2312;
1618 }
1619
1620 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1621 {
1622         u8 hue = 0, max = max3(c->r, c->g, c->b);
1623
1624         if (c->r > max / 2)
1625                 hue |= 4;
1626         if (c->g > max / 2)
1627                 hue |= 2;
1628         if (c->b > max / 2)
1629                 hue |= 1;
1630
1631         if (hue == 7 && max <= 0x55) {
1632                 hue = 0;
1633                 vc->vc_intensity = 2;
1634         } else if (max > 0xaa)
1635                 vc->vc_intensity = 2;
1636         else
1637                 vc->vc_intensity = 1;
1638
1639         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1640 }
1641
1642 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1643 {
1644         /* For backgrounds, err on the dark side. */
1645         vc->vc_color = (vc->vc_color & 0x0f)
1646                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1647 }
1648
1649 /*
1650  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1651  * and thus need to be detected and ignored by hand. That standard also
1652  * wants : rather than ; as separators but sequences containing : are currently
1653  * completely ignored by the parser.
1654  *
1655  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1656  * supporting them.
1657  */
1658 static int vc_t416_color(struct vc_data *vc, int i,
1659                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1660 {
1661         struct rgb c;
1662
1663         i++;
1664         if (i > vc->vc_npar)
1665                 return i;
1666
1667         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1668                 /* 256 colours */
1669                 i++;
1670                 rgb_from_256(vc->vc_par[i], &c);
1671         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1672                 /* 24 bit */
1673                 c.r = vc->vc_par[i + 1];
1674                 c.g = vc->vc_par[i + 2];
1675                 c.b = vc->vc_par[i + 3];
1676                 i += 3;
1677         } else
1678                 return i;
1679
1680         set_color(vc, &c);
1681
1682         return i;
1683 }
1684
1685 /* console_lock is held */
1686 static void csi_m(struct vc_data *vc)
1687 {
1688         int i;
1689
1690         for (i = 0; i <= vc->vc_npar; i++)
1691                 switch (vc->vc_par[i]) {
1692                 case 0: /* all attributes off */
1693                         default_attr(vc);
1694                         break;
1695                 case 1:
1696                         vc->vc_intensity = 2;
1697                         break;
1698                 case 2:
1699                         vc->vc_intensity = 0;
1700                         break;
1701                 case 3:
1702                         vc->vc_italic = 1;
1703                         break;
1704                 case 21:
1705                         /*
1706                          * No console drivers support double underline, so
1707                          * convert it to a single underline.
1708                          */
1709                 case 4:
1710                         vc->vc_underline = 1;
1711                         break;
1712                 case 5:
1713                         vc->vc_blink = 1;
1714                         break;
1715                 case 7:
1716                         vc->vc_reverse = 1;
1717                         break;
1718                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1719                           * Select primary font, don't display control chars if
1720                           * defined, don't set bit 8 on output.
1721                           */
1722                         vc->vc_translate = set_translate(vc->vc_charset == 0
1723                                         ? vc->vc_G0_charset
1724                                         : vc->vc_G1_charset, vc);
1725                         vc->vc_disp_ctrl = 0;
1726                         vc->vc_toggle_meta = 0;
1727                         break;
1728                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1729                           * Select first alternate font, lets chars < 32 be
1730                           * displayed as ROM chars.
1731                           */
1732                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1733                         vc->vc_disp_ctrl = 1;
1734                         vc->vc_toggle_meta = 0;
1735                         break;
1736                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1737                           * Select second alternate font, toggle high bit
1738                           * before displaying as ROM char.
1739                           */
1740                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1741                         vc->vc_disp_ctrl = 1;
1742                         vc->vc_toggle_meta = 1;
1743                         break;
1744                 case 22:
1745                         vc->vc_intensity = 1;
1746                         break;
1747                 case 23:
1748                         vc->vc_italic = 0;
1749                         break;
1750                 case 24:
1751                         vc->vc_underline = 0;
1752                         break;
1753                 case 25:
1754                         vc->vc_blink = 0;
1755                         break;
1756                 case 27:
1757                         vc->vc_reverse = 0;
1758                         break;
1759                 case 38:
1760                         i = vc_t416_color(vc, i, rgb_foreground);
1761                         break;
1762                 case 48:
1763                         i = vc_t416_color(vc, i, rgb_background);
1764                         break;
1765                 case 39:
1766                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1767                                 (vc->vc_color & 0xf0);
1768                         break;
1769                 case 49:
1770                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1771                                 (vc->vc_color & 0x0f);
1772                         break;
1773                 default:
1774                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1775                                 if (vc->vc_par[i] < 100)
1776                                         vc->vc_intensity = 2;
1777                                 vc->vc_par[i] -= 60;
1778                         }
1779                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1780                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1781                                         | (vc->vc_color & 0xf0);
1782                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1783                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1784                                         | (vc->vc_color & 0x0f);
1785                         break;
1786                 }
1787         update_attr(vc);
1788 }
1789
1790 static void respond_string(const char *p, struct tty_port *port)
1791 {
1792         while (*p) {
1793                 tty_insert_flip_char(port, *p, 0);
1794                 p++;
1795         }
1796         tty_schedule_flip(port);
1797 }
1798
1799 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1800 {
1801         char buf[40];
1802
1803         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1804         respond_string(buf, tty->port);
1805 }
1806
1807 static inline void status_report(struct tty_struct *tty)
1808 {
1809         respond_string("\033[0n", tty->port);   /* Terminal ok */
1810 }
1811
1812 static inline void respond_ID(struct tty_struct *tty)
1813 {
1814         respond_string(VT102ID, tty->port);
1815 }
1816
1817 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1818 {
1819         char buf[8];
1820
1821         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1822                 (char)('!' + mry));
1823         respond_string(buf, tty->port);
1824 }
1825
1826 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1827 int mouse_reporting(void)
1828 {
1829         return vc_cons[fg_console].d->vc_report_mouse;
1830 }
1831
1832 /* console_lock is held */
1833 static void set_mode(struct vc_data *vc, int on_off)
1834 {
1835         int i;
1836
1837         for (i = 0; i <= vc->vc_npar; i++)
1838                 if (vc->vc_priv == EPdec) {
1839                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1840                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1841                                 if (on_off)
1842                                         set_kbd(vc, decckm);
1843                                 else
1844                                         clr_kbd(vc, decckm);
1845                                 break;
1846                         case 3: /* 80/132 mode switch unimplemented */
1847 #if 0
1848                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1849                                 /* this alone does not suffice; some user mode
1850                                    utility has to change the hardware regs */
1851 #endif
1852                                 break;
1853                         case 5:                 /* Inverted screen on/off */
1854                                 if (vc->vc_decscnm != on_off) {
1855                                         vc->vc_decscnm = on_off;
1856                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1857                                         update_attr(vc);
1858                                 }
1859                                 break;
1860                         case 6:                 /* Origin relative/absolute */
1861                                 vc->vc_decom = on_off;
1862                                 gotoxay(vc, 0, 0);
1863                                 break;
1864                         case 7:                 /* Autowrap on/off */
1865                                 vc->vc_decawm = on_off;
1866                                 break;
1867                         case 8:                 /* Autorepeat on/off */
1868                                 if (on_off)
1869                                         set_kbd(vc, decarm);
1870                                 else
1871                                         clr_kbd(vc, decarm);
1872                                 break;
1873                         case 9:
1874                                 vc->vc_report_mouse = on_off ? 1 : 0;
1875                                 break;
1876                         case 25:                /* Cursor on/off */
1877                                 vc->vc_deccm = on_off;
1878                                 break;
1879                         case 1000:
1880                                 vc->vc_report_mouse = on_off ? 2 : 0;
1881                                 break;
1882                         }
1883                 } else {
1884                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1885                         case 3:                 /* Monitor (display ctrls) */
1886                                 vc->vc_disp_ctrl = on_off;
1887                                 break;
1888                         case 4:                 /* Insert Mode on/off */
1889                                 vc->vc_decim = on_off;
1890                                 break;
1891                         case 20:                /* Lf, Enter == CrLf/Lf */
1892                                 if (on_off)
1893                                         set_kbd(vc, lnm);
1894                                 else
1895                                         clr_kbd(vc, lnm);
1896                                 break;
1897                         }
1898                 }
1899 }
1900
1901 /* console_lock is held */
1902 static void setterm_command(struct vc_data *vc)
1903 {
1904         switch(vc->vc_par[0]) {
1905                 case 1: /* set color for underline mode */
1906                         if (vc->vc_can_do_color &&
1907                                         vc->vc_par[1] < 16) {
1908                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1909                                 if (vc->vc_underline)
1910                                         update_attr(vc);
1911                         }
1912                         break;
1913                 case 2: /* set color for half intensity mode */
1914                         if (vc->vc_can_do_color &&
1915                                         vc->vc_par[1] < 16) {
1916                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1917                                 if (vc->vc_intensity == 0)
1918                                         update_attr(vc);
1919                         }
1920                         break;
1921                 case 8: /* store colors as defaults */
1922                         vc->vc_def_color = vc->vc_attr;
1923                         if (vc->vc_hi_font_mask == 0x100)
1924                                 vc->vc_def_color >>= 1;
1925                         default_attr(vc);
1926                         update_attr(vc);
1927                         break;
1928                 case 9: /* set blanking interval */
1929                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1930                         poke_blanked_console();
1931                         break;
1932                 case 10: /* set bell frequency in Hz */
1933                         if (vc->vc_npar >= 1)
1934                                 vc->vc_bell_pitch = vc->vc_par[1];
1935                         else
1936                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1937                         break;
1938                 case 11: /* set bell duration in msec */
1939                         if (vc->vc_npar >= 1)
1940                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1941                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1942                         else
1943                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1944                         break;
1945                 case 12: /* bring specified console to the front */
1946                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1947                                 set_console(vc->vc_par[1] - 1);
1948                         break;
1949                 case 13: /* unblank the screen */
1950                         poke_blanked_console();
1951                         break;
1952                 case 14: /* set vesa powerdown interval */
1953                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1954                         break;
1955                 case 15: /* activate the previous console */
1956                         set_console(last_console);
1957                         break;
1958                 case 16: /* set cursor blink duration in msec */
1959                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1960                                         vc->vc_par[1] <= USHRT_MAX)
1961                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1962                         else
1963                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1964                         break;
1965         }
1966 }
1967
1968 /* console_lock is held */
1969 static void csi_at(struct vc_data *vc, unsigned int nr)
1970 {
1971         if (nr > vc->vc_cols - vc->vc_x)
1972                 nr = vc->vc_cols - vc->vc_x;
1973         else if (!nr)
1974                 nr = 1;
1975         insert_char(vc, nr);
1976 }
1977
1978 /* console_lock is held */
1979 static void csi_L(struct vc_data *vc, unsigned int nr)
1980 {
1981         if (nr > vc->vc_rows - vc->vc_y)
1982                 nr = vc->vc_rows - vc->vc_y;
1983         else if (!nr)
1984                 nr = 1;
1985         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1986         vc->vc_need_wrap = 0;
1987 }
1988
1989 /* console_lock is held */
1990 static void csi_P(struct vc_data *vc, unsigned int nr)
1991 {
1992         if (nr > vc->vc_cols - vc->vc_x)
1993                 nr = vc->vc_cols - vc->vc_x;
1994         else if (!nr)
1995                 nr = 1;
1996         delete_char(vc, nr);
1997 }
1998
1999 /* console_lock is held */
2000 static void csi_M(struct vc_data *vc, unsigned int nr)
2001 {
2002         if (nr > vc->vc_rows - vc->vc_y)
2003                 nr = vc->vc_rows - vc->vc_y;
2004         else if (!nr)
2005                 nr=1;
2006         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
2007         vc->vc_need_wrap = 0;
2008 }
2009
2010 /* console_lock is held (except via vc_init->reset_terminal */
2011 static void save_cur(struct vc_data *vc)
2012 {
2013         vc->vc_saved_x          = vc->vc_x;
2014         vc->vc_saved_y          = vc->vc_y;
2015         vc->vc_s_intensity      = vc->vc_intensity;
2016         vc->vc_s_italic         = vc->vc_italic;
2017         vc->vc_s_underline      = vc->vc_underline;
2018         vc->vc_s_blink          = vc->vc_blink;
2019         vc->vc_s_reverse        = vc->vc_reverse;
2020         vc->vc_s_charset        = vc->vc_charset;
2021         vc->vc_s_color          = vc->vc_color;
2022         vc->vc_saved_G0         = vc->vc_G0_charset;
2023         vc->vc_saved_G1         = vc->vc_G1_charset;
2024 }
2025
2026 /* console_lock is held */
2027 static void restore_cur(struct vc_data *vc)
2028 {
2029         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2030         vc->vc_intensity        = vc->vc_s_intensity;
2031         vc->vc_italic           = vc->vc_s_italic;
2032         vc->vc_underline        = vc->vc_s_underline;
2033         vc->vc_blink            = vc->vc_s_blink;
2034         vc->vc_reverse          = vc->vc_s_reverse;
2035         vc->vc_charset          = vc->vc_s_charset;
2036         vc->vc_color            = vc->vc_s_color;
2037         vc->vc_G0_charset       = vc->vc_saved_G0;
2038         vc->vc_G1_charset       = vc->vc_saved_G1;
2039         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2040         update_attr(vc);
2041         vc->vc_need_wrap = 0;
2042 }
2043
2044 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2045         EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2046         ESpalette, ESosc };
2047
2048 /* console_lock is held (except via vc_init()) */
2049 static void reset_terminal(struct vc_data *vc, int do_clear)
2050 {
2051         vc->vc_top              = 0;
2052         vc->vc_bottom           = vc->vc_rows;
2053         vc->vc_state            = ESnormal;
2054         vc->vc_priv             = EPecma;
2055         vc->vc_translate        = set_translate(LAT1_MAP, vc);
2056         vc->vc_G0_charset       = LAT1_MAP;
2057         vc->vc_G1_charset       = GRAF_MAP;
2058         vc->vc_charset          = 0;
2059         vc->vc_need_wrap        = 0;
2060         vc->vc_report_mouse     = 0;
2061         vc->vc_utf              = default_utf8;
2062         vc->vc_utf_count        = 0;
2063
2064         vc->vc_disp_ctrl        = 0;
2065         vc->vc_toggle_meta      = 0;
2066
2067         vc->vc_decscnm          = 0;
2068         vc->vc_decom            = 0;
2069         vc->vc_decawm           = 1;
2070         vc->vc_deccm            = global_cursor_default;
2071         vc->vc_decim            = 0;
2072
2073         vt_reset_keyboard(vc->vc_num);
2074
2075         vc->vc_cursor_type = cur_default;
2076         vc->vc_complement_mask = vc->vc_s_complement_mask;
2077
2078         default_attr(vc);
2079         update_attr(vc);
2080
2081         vc->vc_tab_stop[0]      =
2082         vc->vc_tab_stop[1]      =
2083         vc->vc_tab_stop[2]      =
2084         vc->vc_tab_stop[3]      =
2085         vc->vc_tab_stop[4]      =
2086         vc->vc_tab_stop[5]      =
2087         vc->vc_tab_stop[6]      =
2088         vc->vc_tab_stop[7]      = 0x01010101;
2089
2090         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2091         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2092         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2093
2094         gotoxy(vc, 0, 0);
2095         save_cur(vc);
2096         if (do_clear)
2097             csi_J(vc, 2);
2098 }
2099
2100 /* console_lock is held */
2101 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2102 {
2103         /*
2104          *  Control characters can be used in the _middle_
2105          *  of an escape sequence.
2106          */
2107         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2108                 return;
2109         switch (c) {
2110         case 0:
2111                 return;
2112         case 7:
2113                 if (vc->vc_state == ESosc)
2114                         vc->vc_state = ESnormal;
2115                 else if (vc->vc_bell_duration)
2116                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2117                 return;
2118         case 8:
2119                 bs(vc);
2120                 return;
2121         case 9:
2122                 vc->vc_pos -= (vc->vc_x << 1);
2123                 while (vc->vc_x < vc->vc_cols - 1) {
2124                         vc->vc_x++;
2125                         if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
2126                                 break;
2127                 }
2128                 vc->vc_pos += (vc->vc_x << 1);
2129                 notify_write(vc, '\t');
2130                 return;
2131         case 10: case 11: case 12:
2132                 lf(vc);
2133                 if (!is_kbd(vc, lnm))
2134                         return;
2135                 /* fall through */
2136         case 13:
2137                 cr(vc);
2138                 return;
2139         case 14:
2140                 vc->vc_charset = 1;
2141                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2142                 vc->vc_disp_ctrl = 1;
2143                 return;
2144         case 15:
2145                 vc->vc_charset = 0;
2146                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2147                 vc->vc_disp_ctrl = 0;
2148                 return;
2149         case 24: case 26:
2150                 vc->vc_state = ESnormal;
2151                 return;
2152         case 27:
2153                 vc->vc_state = ESesc;
2154                 return;
2155         case 127:
2156                 del(vc);
2157                 return;
2158         case 128+27:
2159                 vc->vc_state = ESsquare;
2160                 return;
2161         }
2162         switch(vc->vc_state) {
2163         case ESesc:
2164                 vc->vc_state = ESnormal;
2165                 switch (c) {
2166                 case '[':
2167                         vc->vc_state = ESsquare;
2168                         return;
2169                 case ']':
2170                         vc->vc_state = ESnonstd;
2171                         return;
2172                 case '%':
2173                         vc->vc_state = ESpercent;
2174                         return;
2175                 case 'E':
2176                         cr(vc);
2177                         lf(vc);
2178                         return;
2179                 case 'M':
2180                         ri(vc);
2181                         return;
2182                 case 'D':
2183                         lf(vc);
2184                         return;
2185                 case 'H':
2186                         vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
2187                         return;
2188                 case 'Z':
2189                         respond_ID(tty);
2190                         return;
2191                 case '7':
2192                         save_cur(vc);
2193                         return;
2194                 case '8':
2195                         restore_cur(vc);
2196                         return;
2197                 case '(':
2198                         vc->vc_state = ESsetG0;
2199                         return;
2200                 case ')':
2201                         vc->vc_state = ESsetG1;
2202                         return;
2203                 case '#':
2204                         vc->vc_state = EShash;
2205                         return;
2206                 case 'c':
2207                         reset_terminal(vc, 1);
2208                         return;
2209                 case '>':  /* Numeric keypad */
2210                         clr_kbd(vc, kbdapplic);
2211                         return;
2212                 case '=':  /* Appl. keypad */
2213                         set_kbd(vc, kbdapplic);
2214                         return;
2215                 }
2216                 return;
2217         case ESnonstd:
2218                 if (c=='P') {   /* palette escape sequence */
2219                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2220                                 vc->vc_par[vc->vc_npar] = 0;
2221                         vc->vc_npar = 0;
2222                         vc->vc_state = ESpalette;
2223                         return;
2224                 } else if (c=='R') {   /* reset palette */
2225                         reset_palette(vc);
2226                         vc->vc_state = ESnormal;
2227                 } else if (c>='0' && c<='9')
2228                         vc->vc_state = ESosc;
2229                 else
2230                         vc->vc_state = ESnormal;
2231                 return;
2232         case ESpalette:
2233                 if (isxdigit(c)) {
2234                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2235                         if (vc->vc_npar == 7) {
2236                                 int i = vc->vc_par[0] * 3, j = 1;
2237                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2238                                 vc->vc_palette[i++] += vc->vc_par[j++];
2239                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2240                                 vc->vc_palette[i++] += vc->vc_par[j++];
2241                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2242                                 vc->vc_palette[i] += vc->vc_par[j];
2243                                 set_palette(vc);
2244                                 vc->vc_state = ESnormal;
2245                         }
2246                 } else
2247                         vc->vc_state = ESnormal;
2248                 return;
2249         case ESsquare:
2250                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2251                         vc->vc_par[vc->vc_npar] = 0;
2252                 vc->vc_npar = 0;
2253                 vc->vc_state = ESgetpars;
2254                 if (c == '[') { /* Function key */
2255                         vc->vc_state=ESfunckey;
2256                         return;
2257                 }
2258                 switch (c) {
2259                 case '?':
2260                         vc->vc_priv = EPdec;
2261                         return;
2262                 case '>':
2263                         vc->vc_priv = EPgt;
2264                         return;
2265                 case '=':
2266                         vc->vc_priv = EPeq;
2267                         return;
2268                 case '<':
2269                         vc->vc_priv = EPlt;
2270                         return;
2271                 }
2272                 vc->vc_priv = EPecma;
2273                 /* fall through */
2274         case ESgetpars:
2275                 if (c == ';' && vc->vc_npar < NPAR - 1) {
2276                         vc->vc_npar++;
2277                         return;
2278                 } else if (c>='0' && c<='9') {
2279                         vc->vc_par[vc->vc_npar] *= 10;
2280                         vc->vc_par[vc->vc_npar] += c - '0';
2281                         return;
2282                 }
2283                 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2284                         vc->vc_state = EScsiignore;
2285                         return;
2286                 }
2287                 vc->vc_state = ESnormal;
2288                 switch(c) {
2289                 case 'h':
2290                         if (vc->vc_priv <= EPdec)
2291                                 set_mode(vc, 1);
2292                         return;
2293                 case 'l':
2294                         if (vc->vc_priv <= EPdec)
2295                                 set_mode(vc, 0);
2296                         return;
2297                 case 'c':
2298                         if (vc->vc_priv == EPdec) {
2299                                 if (vc->vc_par[0])
2300                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2301                                 else
2302                                         vc->vc_cursor_type = cur_default;
2303                                 return;
2304                         }
2305                         break;
2306                 case 'm':
2307                         if (vc->vc_priv == EPdec) {
2308                                 clear_selection();
2309                                 if (vc->vc_par[0])
2310                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2311                                 else
2312                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
2313                                 return;
2314                         }
2315                         break;
2316                 case 'n':
2317                         if (vc->vc_priv == EPecma) {
2318                                 if (vc->vc_par[0] == 5)
2319                                         status_report(tty);
2320                                 else if (vc->vc_par[0] == 6)
2321                                         cursor_report(vc, tty);
2322                         }
2323                         return;
2324                 }
2325                 if (vc->vc_priv != EPecma) {
2326                         vc->vc_priv = EPecma;
2327                         return;
2328                 }
2329                 switch(c) {
2330                 case 'G': case '`':
2331                         if (vc->vc_par[0])
2332                                 vc->vc_par[0]--;
2333                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
2334                         return;
2335                 case 'A':
2336                         if (!vc->vc_par[0])
2337                                 vc->vc_par[0]++;
2338                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2339                         return;
2340                 case 'B': case 'e':
2341                         if (!vc->vc_par[0])
2342                                 vc->vc_par[0]++;
2343                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2344                         return;
2345                 case 'C': case 'a':
2346                         if (!vc->vc_par[0])
2347                                 vc->vc_par[0]++;
2348                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2349                         return;
2350                 case 'D':
2351                         if (!vc->vc_par[0])
2352                                 vc->vc_par[0]++;
2353                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2354                         return;
2355                 case 'E':
2356                         if (!vc->vc_par[0])
2357                                 vc->vc_par[0]++;
2358                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2359                         return;
2360                 case 'F':
2361                         if (!vc->vc_par[0])
2362                                 vc->vc_par[0]++;
2363                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2364                         return;
2365                 case 'd':
2366                         if (vc->vc_par[0])
2367                                 vc->vc_par[0]--;
2368                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2369                         return;
2370                 case 'H': case 'f':
2371                         if (vc->vc_par[0])
2372                                 vc->vc_par[0]--;
2373                         if (vc->vc_par[1])
2374                                 vc->vc_par[1]--;
2375                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2376                         return;
2377                 case 'J':
2378                         csi_J(vc, vc->vc_par[0]);
2379                         return;
2380                 case 'K':
2381                         csi_K(vc, vc->vc_par[0]);
2382                         return;
2383                 case 'L':
2384                         csi_L(vc, vc->vc_par[0]);
2385                         return;
2386                 case 'M':
2387                         csi_M(vc, vc->vc_par[0]);
2388                         return;
2389                 case 'P':
2390                         csi_P(vc, vc->vc_par[0]);
2391                         return;
2392                 case 'c':
2393                         if (!vc->vc_par[0])
2394                                 respond_ID(tty);
2395                         return;
2396                 case 'g':
2397                         if (!vc->vc_par[0])
2398                                 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2399                         else if (vc->vc_par[0] == 3) {
2400                                 vc->vc_tab_stop[0] =
2401                                         vc->vc_tab_stop[1] =
2402                                         vc->vc_tab_stop[2] =
2403                                         vc->vc_tab_stop[3] =
2404                                         vc->vc_tab_stop[4] =
2405                                         vc->vc_tab_stop[5] =
2406                                         vc->vc_tab_stop[6] =
2407                                         vc->vc_tab_stop[7] = 0;
2408                         }
2409                         return;
2410                 case 'm':
2411                         csi_m(vc);
2412                         return;
2413                 case 'q': /* DECLL - but only 3 leds */
2414                         /* map 0,1,2,3 to 0,1,2,4 */
2415                         if (vc->vc_par[0] < 4)
2416                                 vt_set_led_state(vc->vc_num,
2417                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2418                         return;
2419                 case 'r':
2420                         if (!vc->vc_par[0])
2421                                 vc->vc_par[0]++;
2422                         if (!vc->vc_par[1])
2423                                 vc->vc_par[1] = vc->vc_rows;
2424                         /* Minimum allowed region is 2 lines */
2425                         if (vc->vc_par[0] < vc->vc_par[1] &&
2426                             vc->vc_par[1] <= vc->vc_rows) {
2427                                 vc->vc_top = vc->vc_par[0] - 1;
2428                                 vc->vc_bottom = vc->vc_par[1];
2429                                 gotoxay(vc, 0, 0);
2430                         }
2431                         return;
2432                 case 's':
2433                         save_cur(vc);
2434                         return;
2435                 case 'u':
2436                         restore_cur(vc);
2437                         return;
2438                 case 'X':
2439                         csi_X(vc, vc->vc_par[0]);
2440                         return;
2441                 case '@':
2442                         csi_at(vc, vc->vc_par[0]);
2443                         return;
2444                 case ']': /* setterm functions */
2445                         setterm_command(vc);
2446                         return;
2447                 }
2448                 return;
2449         case EScsiignore:
2450                 if (c >= 20 && c <= 0x3f)
2451                         return;
2452                 vc->vc_state = ESnormal;
2453                 return;
2454         case ESpercent:
2455                 vc->vc_state = ESnormal;
2456                 switch (c) {
2457                 case '@':  /* defined in ISO 2022 */
2458                         vc->vc_utf = 0;
2459                         return;
2460                 case 'G':  /* prelim official escape code */
2461                 case '8':  /* retained for compatibility */
2462                         vc->vc_utf = 1;
2463                         return;
2464                 }
2465                 return;
2466         case ESfunckey:
2467                 vc->vc_state = ESnormal;
2468                 return;
2469         case EShash:
2470                 vc->vc_state = ESnormal;
2471                 if (c == '8') {
2472                         /* DEC screen alignment test. kludge :-) */
2473                         vc->vc_video_erase_char =
2474                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2475                         csi_J(vc, 2);
2476                         vc->vc_video_erase_char =
2477                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2478                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2479                 }
2480                 return;
2481         case ESsetG0:
2482                 if (c == '0')
2483                         vc->vc_G0_charset = GRAF_MAP;
2484                 else if (c == 'B')
2485                         vc->vc_G0_charset = LAT1_MAP;
2486                 else if (c == 'U')
2487                         vc->vc_G0_charset = IBMPC_MAP;
2488                 else if (c == 'K')
2489                         vc->vc_G0_charset = USER_MAP;
2490                 if (vc->vc_charset == 0)
2491                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2492                 vc->vc_state = ESnormal;
2493                 return;
2494         case ESsetG1:
2495                 if (c == '0')
2496                         vc->vc_G1_charset = GRAF_MAP;
2497                 else if (c == 'B')
2498                         vc->vc_G1_charset = LAT1_MAP;
2499                 else if (c == 'U')
2500                         vc->vc_G1_charset = IBMPC_MAP;
2501                 else if (c == 'K')
2502                         vc->vc_G1_charset = USER_MAP;
2503                 if (vc->vc_charset == 1)
2504                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2505                 vc->vc_state = ESnormal;
2506                 return;
2507         case ESosc:
2508                 return;
2509         default:
2510                 vc->vc_state = ESnormal;
2511         }
2512 }
2513
2514 /* is_double_width() is based on the wcwidth() implementation by
2515  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2516  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2517  */
2518 struct interval {
2519         uint32_t first;
2520         uint32_t last;
2521 };
2522
2523 static int ucs_cmp(const void *key, const void *elt)
2524 {
2525         uint32_t ucs = *(uint32_t *)key;
2526         struct interval e = *(struct interval *) elt;
2527
2528         if (ucs > e.last)
2529                 return 1;
2530         else if (ucs < e.first)
2531                 return -1;
2532         return 0;
2533 }
2534
2535 static int is_double_width(uint32_t ucs)
2536 {
2537         static const struct interval double_width[] = {
2538                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2539                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2540                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2541                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2542         };
2543         if (ucs < double_width[0].first ||
2544             ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2545                 return 0;
2546
2547         return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2548                         sizeof(struct interval), ucs_cmp) != NULL;
2549 }
2550
2551 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2552                 unsigned long draw_to, int *draw_x)
2553 {
2554         if (*draw_x < 0)
2555                 return;
2556
2557         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2558                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2559         *draw_x = -1;
2560 }
2561
2562 /* acquires console_lock */
2563 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2564 {
2565         int c, next_c, tc, ok, n = 0, draw_x = -1;
2566         unsigned int currcons;
2567         unsigned long draw_from = 0, draw_to = 0;
2568         struct vc_data *vc;
2569         unsigned char vc_attr;
2570         struct vt_notifier_param param;
2571         uint8_t rescan;
2572         uint8_t inverse;
2573         uint8_t width;
2574         u16 himask, charmask;
2575
2576         if (in_interrupt())
2577                 return count;
2578
2579         might_sleep();
2580
2581         console_lock();
2582         vc = tty->driver_data;
2583         if (vc == NULL) {
2584                 pr_err("vt: argh, driver_data is NULL !\n");
2585                 console_unlock();
2586                 return 0;
2587         }
2588
2589         currcons = vc->vc_num;
2590         if (!vc_cons_allocated(currcons)) {
2591                 /* could this happen? */
2592                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2593                 console_unlock();
2594                 return 0;
2595         }
2596
2597         himask = vc->vc_hi_font_mask;
2598         charmask = himask ? 0x1ff : 0xff;
2599
2600         /* undraw cursor first */
2601         if (con_is_fg(vc))
2602                 hide_cursor(vc);
2603
2604         param.vc = vc;
2605
2606         while (!tty->stopped && count) {
2607                 int orig = *buf;
2608                 c = orig;
2609                 buf++;
2610                 n++;
2611                 count--;
2612                 rescan = 0;
2613                 inverse = 0;
2614                 width = 1;
2615
2616                 /* Do no translation at all in control states */
2617                 if (vc->vc_state != ESnormal) {
2618                         tc = c;
2619                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2620                     /* Combine UTF-8 into Unicode in vc_utf_char.
2621                      * vc_utf_count is the number of continuation bytes still
2622                      * expected to arrive.
2623                      * vc_npar is the number of continuation bytes arrived so
2624                      * far
2625                      */
2626 rescan_last_byte:
2627                     if ((c & 0xc0) == 0x80) {
2628                         /* Continuation byte received */
2629                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2630                         if (vc->vc_utf_count) {
2631                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2632                             vc->vc_npar++;
2633                             if (--vc->vc_utf_count) {
2634                                 /* Still need some bytes */
2635                                 continue;
2636                             }
2637                             /* Got a whole character */
2638                             c = vc->vc_utf_char;
2639                             /* Reject overlong sequences */
2640                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2641                                         c > utf8_length_changes[vc->vc_npar])
2642                                 c = 0xfffd;
2643                         } else {
2644                             /* Unexpected continuation byte */
2645                             vc->vc_utf_count = 0;
2646                             c = 0xfffd;
2647                         }
2648                     } else {
2649                         /* Single ASCII byte or first byte of a sequence received */
2650                         if (vc->vc_utf_count) {
2651                             /* Continuation byte expected */
2652                             rescan = 1;
2653                             vc->vc_utf_count = 0;
2654                             c = 0xfffd;
2655                         } else if (c > 0x7f) {
2656                             /* First byte of a multibyte sequence received */
2657                             vc->vc_npar = 0;
2658                             if ((c & 0xe0) == 0xc0) {
2659                                 vc->vc_utf_count = 1;
2660                                 vc->vc_utf_char = (c & 0x1f);
2661                             } else if ((c & 0xf0) == 0xe0) {
2662                                 vc->vc_utf_count = 2;
2663                                 vc->vc_utf_char = (c & 0x0f);
2664                             } else if ((c & 0xf8) == 0xf0) {
2665                                 vc->vc_utf_count = 3;
2666                                 vc->vc_utf_char = (c & 0x07);
2667                             } else if ((c & 0xfc) == 0xf8) {
2668                                 vc->vc_utf_count = 4;
2669                                 vc->vc_utf_char = (c & 0x03);
2670                             } else if ((c & 0xfe) == 0xfc) {
2671                                 vc->vc_utf_count = 5;
2672                                 vc->vc_utf_char = (c & 0x01);
2673                             } else {
2674                                 /* 254 and 255 are invalid */
2675                                 c = 0xfffd;
2676                             }
2677                             if (vc->vc_utf_count) {
2678                                 /* Still need some bytes */
2679                                 continue;
2680                             }
2681                         }
2682                         /* Nothing to do if an ASCII byte was received */
2683                     }
2684                     /* End of UTF-8 decoding. */
2685                     /* c is the received character, or U+FFFD for invalid sequences. */
2686                     /* Replace invalid Unicode code points with U+FFFD too */
2687                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2688                         c = 0xfffd;
2689                     tc = c;
2690                 } else {        /* no utf or alternate charset mode */
2691                     tc = vc_translate(vc, c);
2692                 }
2693
2694                 param.c = tc;
2695                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2696                                         &param) == NOTIFY_STOP)
2697                         continue;
2698
2699                 /* If the original code was a control character we
2700                  * only allow a glyph to be displayed if the code is
2701                  * not normally used (such as for cursor movement) or
2702                  * if the disp_ctrl mode has been explicitly enabled.
2703                  * Certain characters (as given by the CTRL_ALWAYS
2704                  * bitmap) are always displayed as control characters,
2705                  * as the console would be pretty useless without
2706                  * them; to display an arbitrary font position use the
2707                  * direct-to-font zone in UTF-8 mode.
2708                  */
2709                 ok = tc && (c >= 32 ||
2710                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2711                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2712                         && (c != 127 || vc->vc_disp_ctrl)
2713                         && (c != 128+27);
2714
2715                 if (vc->vc_state == ESnormal && ok) {
2716                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2717                                 if (is_double_width(c))
2718                                         width = 2;
2719                         }
2720                         /* Now try to find out how to display it */
2721                         tc = conv_uni_to_pc(vc, tc);
2722                         if (tc & ~charmask) {
2723                                 if (tc == -1 || tc == -2) {
2724                                     continue; /* nothing to display */
2725                                 }
2726                                 /* Glyph not found */
2727                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2728                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2729                                        This would make absolutely no sense with Unicode in mind,
2730                                        but do this for ASCII characters since a font may lack
2731                                        Unicode mapping info and we don't want to end up with
2732                                        having question marks only. */
2733                                     tc = c;
2734                                 } else {
2735                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2736                                     tc = conv_uni_to_pc(vc, 0xfffd);
2737                                     if (tc < 0) {
2738                                         inverse = 1;
2739                                         tc = conv_uni_to_pc(vc, '?');
2740                                         if (tc < 0) tc = '?';
2741                                     }
2742                                 }
2743                         }
2744
2745                         if (!inverse) {
2746                                 vc_attr = vc->vc_attr;
2747                         } else {
2748                                 /* invert vc_attr */
2749                                 if (!vc->vc_can_do_color) {
2750                                         vc_attr = (vc->vc_attr) ^ 0x08;
2751                                 } else if (vc->vc_hi_font_mask == 0x100) {
2752                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2753                                 } else {
2754                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2755                                 }
2756                                 con_flush(vc, draw_from, draw_to, &draw_x);
2757                         }
2758
2759                         next_c = c;
2760                         while (1) {
2761                                 if (vc->vc_need_wrap || vc->vc_decim)
2762                                         con_flush(vc, draw_from, draw_to,
2763                                                         &draw_x);
2764                                 if (vc->vc_need_wrap) {
2765                                         cr(vc);
2766                                         lf(vc);
2767                                 }
2768                                 if (vc->vc_decim)
2769                                         insert_char(vc, 1);
2770                                 vc_uniscr_putc(vc, next_c);
2771                                 scr_writew(himask ?
2772                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2773                                              (vc_attr << 8) + tc,
2774                                            (u16 *) vc->vc_pos);
2775                                 if (con_should_update(vc) && draw_x < 0) {
2776                                         draw_x = vc->vc_x;
2777                                         draw_from = vc->vc_pos;
2778                                 }
2779                                 if (vc->vc_x == vc->vc_cols - 1) {
2780                                         vc->vc_need_wrap = vc->vc_decawm;
2781                                         draw_to = vc->vc_pos + 2;
2782                                 } else {
2783                                         vc->vc_x++;
2784                                         draw_to = (vc->vc_pos += 2);
2785                                 }
2786
2787                                 if (!--width) break;
2788
2789                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2790                                 if (tc < 0) tc = ' ';
2791                                 next_c = ' ';
2792                         }
2793                         notify_write(vc, c);
2794
2795                         if (inverse)
2796                                 con_flush(vc, draw_from, draw_to, &draw_x);
2797
2798                         if (rescan) {
2799                                 rescan = 0;
2800                                 inverse = 0;
2801                                 width = 1;
2802                                 c = orig;
2803                                 goto rescan_last_byte;
2804                         }
2805                         continue;
2806                 }
2807                 con_flush(vc, draw_from, draw_to, &draw_x);
2808                 do_con_trol(tty, vc, orig);
2809         }
2810         con_flush(vc, draw_from, draw_to, &draw_x);
2811         vc_uniscr_debug_check(vc);
2812         console_conditional_schedule();
2813         notify_update(vc);
2814         console_unlock();
2815         return n;
2816 }
2817
2818 /*
2819  * This is the console switching callback.
2820  *
2821  * Doing console switching in a process context allows
2822  * us to do the switches asynchronously (needed when we want
2823  * to switch due to a keyboard interrupt).  Synchronization
2824  * with other console code and prevention of re-entrancy is
2825  * ensured with console_lock.
2826  */
2827 static void console_callback(struct work_struct *ignored)
2828 {
2829         console_lock();
2830
2831         if (want_console >= 0) {
2832                 if (want_console != fg_console &&
2833                     vc_cons_allocated(want_console)) {
2834                         hide_cursor(vc_cons[fg_console].d);
2835                         change_console(vc_cons[want_console].d);
2836                         /* we only changed when the console had already
2837                            been allocated - a new console is not created
2838                            in an interrupt routine */
2839                 }
2840                 want_console = -1;
2841         }
2842         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2843                 do_poke_blanked_console = 0;
2844                 poke_blanked_console();
2845         }
2846         if (scrollback_delta) {
2847                 struct vc_data *vc = vc_cons[fg_console].d;
2848                 clear_selection();
2849                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2850                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2851                 scrollback_delta = 0;
2852         }
2853         if (blank_timer_expired) {
2854                 do_blank_screen(0);
2855                 blank_timer_expired = 0;
2856         }
2857         notify_update(vc_cons[fg_console].d);
2858
2859         console_unlock();
2860 }
2861
2862 int set_console(int nr)
2863 {
2864         struct vc_data *vc = vc_cons[fg_console].d;
2865
2866         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2867                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2868
2869                 /*
2870                  * Console switch will fail in console_callback() or
2871                  * change_console() so there is no point scheduling
2872                  * the callback
2873                  *
2874                  * Existing set_console() users don't check the return
2875                  * value so this shouldn't break anything
2876                  */
2877                 return -EINVAL;
2878         }
2879
2880         want_console = nr;
2881         schedule_console_callback();
2882
2883         return 0;
2884 }
2885
2886 struct tty_driver *console_driver;
2887
2888 #ifdef CONFIG_VT_CONSOLE
2889
2890 /**
2891  * vt_kmsg_redirect() - Sets/gets the kernel message console
2892  * @new:        The new virtual terminal number or -1 if the console should stay
2893  *              unchanged
2894  *
2895  * By default, the kernel messages are always printed on the current virtual
2896  * console. However, the user may modify that default with the
2897  * TIOCL_SETKMSGREDIRECT ioctl call.
2898  *
2899  * This function sets the kernel message console to be @new. It returns the old
2900  * virtual console number. The virtual terminal number 0 (both as parameter and
2901  * return value) means no redirection (i.e. always printed on the currently
2902  * active console).
2903  *
2904  * The parameter -1 means that only the current console is returned, but the
2905  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2906  * case to make the code more understandable.
2907  *
2908  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2909  * the parameter and always returns 0.
2910  */
2911 int vt_kmsg_redirect(int new)
2912 {
2913         static int kmsg_con;
2914
2915         if (new != -1)
2916                 return xchg(&kmsg_con, new);
2917         else
2918                 return kmsg_con;
2919 }
2920
2921 /*
2922  *      Console on virtual terminal
2923  *
2924  * The console must be locked when we get here.
2925  */
2926
2927 static void vt_console_print(struct console *co, const char *b, unsigned count)
2928 {
2929         struct vc_data *vc = vc_cons[fg_console].d;
2930         unsigned char c;
2931         static DEFINE_SPINLOCK(printing_lock);
2932         const ushort *start;
2933         ushort start_x, cnt;
2934         int kmsg_console;
2935
2936         /* console busy or not yet initialized */
2937         if (!printable)
2938                 return;
2939         if (!spin_trylock(&printing_lock))
2940                 return;
2941
2942         kmsg_console = vt_get_kmsg_redirect();
2943         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2944                 vc = vc_cons[kmsg_console - 1].d;
2945
2946         if (!vc_cons_allocated(fg_console)) {
2947                 /* impossible */
2948                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2949                 goto quit;
2950         }
2951
2952         if (vc->vc_mode != KD_TEXT)
2953                 goto quit;
2954
2955         /* undraw cursor first */
2956         if (con_is_fg(vc))
2957                 hide_cursor(vc);
2958
2959         start = (ushort *)vc->vc_pos;
2960         start_x = vc->vc_x;
2961         cnt = 0;
2962         while (count--) {
2963                 c = *b++;
2964                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2965                         if (cnt && con_is_visible(vc))
2966                                 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2967                         cnt = 0;
2968                         if (c == 8) {           /* backspace */
2969                                 bs(vc);
2970                                 start = (ushort *)vc->vc_pos;
2971                                 start_x = vc->vc_x;
2972                                 continue;
2973                         }
2974                         if (c != 13)
2975                                 lf(vc);
2976                         cr(vc);
2977                         start = (ushort *)vc->vc_pos;
2978                         start_x = vc->vc_x;
2979                         if (c == 10 || c == 13)
2980                                 continue;
2981                 }
2982                 vc_uniscr_putc(vc, c);
2983                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2984                 notify_write(vc, c);
2985                 cnt++;
2986                 if (vc->vc_x == vc->vc_cols - 1) {
2987                         vc->vc_need_wrap = 1;
2988                 } else {
2989                         vc->vc_pos += 2;
2990                         vc->vc_x++;
2991                 }
2992         }
2993         if (cnt && con_is_visible(vc))
2994                 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2995         set_cursor(vc);
2996         notify_update(vc);
2997
2998 quit:
2999         spin_unlock(&printing_lock);
3000 }
3001
3002 static struct tty_driver *vt_console_device(struct console *c, int *index)
3003 {
3004         *index = c->index ? c->index-1 : fg_console;
3005         return console_driver;
3006 }
3007
3008 static struct console vt_console_driver = {
3009         .name           = "tty",
3010         .write          = vt_console_print,
3011         .device         = vt_console_device,
3012         .unblank        = unblank_screen,
3013         .flags          = CON_PRINTBUFFER,
3014         .index          = -1,
3015 };
3016 #endif
3017
3018 /*
3019  *      Handling of Linux-specific VC ioctls
3020  */
3021
3022 /*
3023  * Generally a bit racy with respect to console_lock();.
3024  *
3025  * There are some functions which don't need it.
3026  *
3027  * There are some functions which can sleep for arbitrary periods
3028  * (paste_selection) but we don't need the lock there anyway.
3029  *
3030  * set_selection_user has locking, and definitely needs it
3031  */
3032
3033 int tioclinux(struct tty_struct *tty, unsigned long arg)
3034 {
3035         char type, data;
3036         char __user *p = (char __user *)arg;
3037         int lines;
3038         int ret;
3039
3040         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3041                 return -EPERM;
3042         if (get_user(type, p))
3043                 return -EFAULT;
3044         ret = 0;
3045
3046         switch (type)
3047         {
3048                 case TIOCL_SETSEL:
3049                         console_lock();
3050                         ret = set_selection_user((struct tiocl_selection
3051                                                  __user *)(p+1), tty);
3052                         console_unlock();
3053                         break;
3054                 case TIOCL_PASTESEL:
3055                         ret = paste_selection(tty);
3056                         break;
3057                 case TIOCL_UNBLANKSCREEN:
3058                         console_lock();
3059                         unblank_screen();
3060                         console_unlock();
3061                         break;
3062                 case TIOCL_SELLOADLUT:
3063                         console_lock();
3064                         ret = sel_loadlut(p);
3065                         console_unlock();
3066                         break;
3067                 case TIOCL_GETSHIFTSTATE:
3068
3069         /*
3070          * Make it possible to react to Shift+Mousebutton.
3071          * Note that 'shift_state' is an undocumented
3072          * kernel-internal variable; programs not closely
3073          * related to the kernel should not use this.
3074          */
3075                         data = vt_get_shift_state();
3076                         ret = put_user(data, p);
3077                         break;
3078                 case TIOCL_GETMOUSEREPORTING:
3079                         console_lock(); /* May be overkill */
3080                         data = mouse_reporting();
3081                         console_unlock();
3082                         ret = put_user(data, p);
3083                         break;
3084                 case TIOCL_SETVESABLANK:
3085                         console_lock();
3086                         ret = set_vesa_blanking(p);
3087                         console_unlock();
3088                         break;
3089                 case TIOCL_GETKMSGREDIRECT:
3090                         data = vt_get_kmsg_redirect();
3091                         ret = put_user(data, p);
3092                         break;
3093                 case TIOCL_SETKMSGREDIRECT:
3094                         if (!capable(CAP_SYS_ADMIN)) {
3095                                 ret = -EPERM;
3096                         } else {
3097                                 if (get_user(data, p+1))
3098                                         ret = -EFAULT;
3099                                 else
3100                                         vt_kmsg_redirect(data);
3101                         }
3102                         break;
3103                 case TIOCL_GETFGCONSOLE:
3104                         /* No locking needed as this is a transiently
3105                            correct return anyway if the caller hasn't
3106                            disabled switching */
3107                         ret = fg_console;
3108                         break;
3109                 case TIOCL_SCROLLCONSOLE:
3110                         if (get_user(lines, (s32 __user *)(p+4))) {
3111                                 ret = -EFAULT;
3112                         } else {
3113                                 /* Need the console lock here. Note that lots
3114                                    of other calls need fixing before the lock
3115                                    is actually useful ! */
3116                                 console_lock();
3117                                 scrollfront(vc_cons[fg_console].d, lines);
3118                                 console_unlock();
3119                                 ret = 0;
3120                         }
3121                         break;
3122                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3123                         console_lock();
3124                         ignore_poke = 1;
3125                         do_blank_screen(0);
3126                         console_unlock();
3127                         break;
3128                 case TIOCL_BLANKEDSCREEN:
3129                         ret = console_blanked;
3130                         break;
3131                 default:
3132                         ret = -EINVAL;
3133                         break;
3134         }
3135         return ret;
3136 }
3137
3138 /*
3139  * /dev/ttyN handling
3140  */
3141
3142 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3143 {
3144         int     retval;
3145
3146         retval = do_con_write(tty, buf, count);
3147         con_flush_chars(tty);
3148
3149         return retval;
3150 }
3151
3152 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3153 {
3154         if (in_interrupt())
3155                 return 0;       /* n_r3964 calls put_char() from interrupt context */
3156         return do_con_write(tty, &ch, 1);
3157 }
3158
3159 static int con_write_room(struct tty_struct *tty)
3160 {
3161         if (tty->stopped)
3162                 return 0;
3163         return 32768;           /* No limit, really; we're not buffering */
3164 }
3165
3166 static int con_chars_in_buffer(struct tty_struct *tty)
3167 {
3168         return 0;               /* we're not buffering */
3169 }
3170
3171 /*
3172  * con_throttle and con_unthrottle are only used for
3173  * paste_selection(), which has to stuff in a large number of
3174  * characters...
3175  */
3176 static void con_throttle(struct tty_struct *tty)
3177 {
3178 }
3179
3180 static void con_unthrottle(struct tty_struct *tty)
3181 {
3182         struct vc_data *vc = tty->driver_data;
3183
3184         wake_up_interruptible(&vc->paste_wait);
3185 }
3186
3187 /*
3188  * Turn the Scroll-Lock LED on when the tty is stopped
3189  */
3190 static void con_stop(struct tty_struct *tty)
3191 {
3192         int console_num;
3193         if (!tty)
3194                 return;
3195         console_num = tty->index;
3196         if (!vc_cons_allocated(console_num))
3197                 return;
3198         vt_kbd_con_stop(console_num);
3199 }
3200
3201 /*
3202  * Turn the Scroll-Lock LED off when the console is started
3203  */
3204 static void con_start(struct tty_struct *tty)
3205 {
3206         int console_num;
3207         if (!tty)
3208                 return;
3209         console_num = tty->index;
3210         if (!vc_cons_allocated(console_num))
3211                 return;
3212         vt_kbd_con_start(console_num);
3213 }
3214
3215 static void con_flush_chars(struct tty_struct *tty)
3216 {
3217         struct vc_data *vc;
3218
3219         if (in_interrupt())     /* from flush_to_ldisc */
3220                 return;
3221
3222         /* if we race with con_close(), vt may be null */
3223         console_lock();
3224         vc = tty->driver_data;
3225         if (vc)
3226                 set_cursor(vc);
3227         console_unlock();
3228 }
3229
3230 /*
3231  * Allocate the console screen memory.
3232  */
3233 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3234 {
3235         unsigned int currcons = tty->index;
3236         struct vc_data *vc;
3237         int ret;
3238
3239         console_lock();
3240         ret = vc_allocate(currcons);
3241         if (ret)
3242                 goto unlock;
3243
3244         vc = vc_cons[currcons].d;
3245
3246         /* Still being freed */
3247         if (vc->port.tty) {
3248                 ret = -ERESTARTSYS;
3249                 goto unlock;
3250         }
3251
3252         ret = tty_port_install(&vc->port, driver, tty);
3253         if (ret)
3254                 goto unlock;
3255
3256         tty->driver_data = vc;
3257         vc->port.tty = tty;
3258
3259         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3260                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3261                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3262         }
3263         if (vc->vc_utf)
3264                 tty->termios.c_iflag |= IUTF8;
3265         else
3266                 tty->termios.c_iflag &= ~IUTF8;
3267 unlock:
3268         console_unlock();
3269         return ret;
3270 }
3271
3272 static int con_open(struct tty_struct *tty, struct file *filp)
3273 {
3274         /* everything done in install */
3275         return 0;
3276 }
3277
3278
3279 static void con_close(struct tty_struct *tty, struct file *filp)
3280 {
3281         /* Nothing to do - we defer to shutdown */
3282 }
3283
3284 static void con_shutdown(struct tty_struct *tty)
3285 {
3286         struct vc_data *vc = tty->driver_data;
3287         BUG_ON(vc == NULL);
3288         console_lock();
3289         vc->port.tty = NULL;
3290         console_unlock();
3291 }
3292
3293 static int default_color           = 7; /* white */
3294 static int default_italic_color    = 2; // green (ASCII)
3295 static int default_underline_color = 3; // cyan (ASCII)
3296 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3297 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3298 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3299
3300 static void vc_init(struct vc_data *vc, unsigned int rows,
3301                     unsigned int cols, int do_clear)
3302 {
3303         int j, k ;
3304
3305         vc->vc_cols = cols;
3306         vc->vc_rows = rows;
3307         vc->vc_size_row = cols << 1;
3308         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3309
3310         set_origin(vc);
3311         vc->vc_pos = vc->vc_origin;
3312         reset_vc(vc);
3313         for (j=k=0; j<16; j++) {
3314                 vc->vc_palette[k++] = default_red[j] ;
3315                 vc->vc_palette[k++] = default_grn[j] ;
3316                 vc->vc_palette[k++] = default_blu[j] ;
3317         }
3318         vc->vc_def_color       = default_color;
3319         vc->vc_ulcolor         = default_underline_color;
3320         vc->vc_itcolor         = default_italic_color;
3321         vc->vc_halfcolor       = 0x08;   /* grey */
3322         init_waitqueue_head(&vc->paste_wait);
3323         reset_terminal(vc, do_clear);
3324 }
3325
3326 /*
3327  * This routine initializes console interrupts, and does nothing
3328  * else. If you want the screen to clear, call tty_write with
3329  * the appropriate escape-sequence.
3330  */
3331
3332 static int __init con_init(void)
3333 {
3334         const char *display_desc = NULL;
3335         struct vc_data *vc;
3336         unsigned int currcons = 0, i;
3337
3338         console_lock();
3339
3340         if (!conswitchp)
3341                 conswitchp = &dummy_con;
3342         display_desc = conswitchp->con_startup();
3343         if (!display_desc) {
3344                 fg_console = 0;
3345                 console_unlock();
3346                 return 0;
3347         }
3348
3349         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3350                 struct con_driver *con_driver = &registered_con_driver[i];
3351
3352                 if (con_driver->con == NULL) {
3353                         con_driver->con = conswitchp;
3354                         con_driver->desc = display_desc;
3355                         con_driver->flag = CON_DRIVER_FLAG_INIT;
3356                         con_driver->first = 0;
3357                         con_driver->last = MAX_NR_CONSOLES - 1;
3358                         break;
3359                 }
3360         }
3361
3362         for (i = 0; i < MAX_NR_CONSOLES; i++)
3363                 con_driver_map[i] = conswitchp;
3364
3365         if (blankinterval) {
3366                 blank_state = blank_normal_wait;
3367                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3368         }
3369
3370         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3371                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3372                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3373                 tty_port_init(&vc->port);
3374                 visual_init(vc, currcons, 1);
3375                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3376                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3377                         currcons || !vc->vc_sw->con_save_screen);
3378         }
3379         currcons = fg_console = 0;
3380         master_display_fg = vc = vc_cons[currcons].d;
3381         set_origin(vc);
3382         save_screen(vc);
3383         gotoxy(vc, vc->vc_x, vc->vc_y);
3384         csi_J(vc, 0);
3385         update_screen(vc);
3386         pr_info("Console: %s %s %dx%d\n",
3387                 vc->vc_can_do_color ? "colour" : "mono",
3388                 display_desc, vc->vc_cols, vc->vc_rows);
3389         printable = 1;
3390
3391         console_unlock();
3392
3393 #ifdef CONFIG_VT_CONSOLE
3394         register_console(&vt_console_driver);
3395 #endif
3396         return 0;
3397 }
3398 console_initcall(con_init);
3399
3400 static const struct tty_operations con_ops = {
3401         .install = con_install,
3402         .open = con_open,
3403         .close = con_close,
3404         .write = con_write,
3405         .write_room = con_write_room,
3406         .put_char = con_put_char,
3407         .flush_chars = con_flush_chars,
3408         .chars_in_buffer = con_chars_in_buffer,
3409         .ioctl = vt_ioctl,
3410 #ifdef CONFIG_COMPAT
3411         .compat_ioctl = vt_compat_ioctl,
3412 #endif
3413         .stop = con_stop,
3414         .start = con_start,
3415         .throttle = con_throttle,
3416         .unthrottle = con_unthrottle,
3417         .resize = vt_resize,
3418         .shutdown = con_shutdown
3419 };
3420
3421 static struct cdev vc0_cdev;
3422
3423 static ssize_t show_tty_active(struct device *dev,
3424                                 struct device_attribute *attr, char *buf)
3425 {
3426         return sprintf(buf, "tty%d\n", fg_console + 1);
3427 }
3428 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3429
3430 static struct attribute *vt_dev_attrs[] = {
3431         &dev_attr_active.attr,
3432         NULL
3433 };
3434
3435 ATTRIBUTE_GROUPS(vt_dev);
3436
3437 int __init vty_init(const struct file_operations *console_fops)
3438 {
3439         cdev_init(&vc0_cdev, console_fops);
3440         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3441             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3442                 panic("Couldn't register /dev/tty0 driver\n");
3443         tty0dev = device_create_with_groups(tty_class, NULL,
3444                                             MKDEV(TTY_MAJOR, 0), NULL,
3445                                             vt_dev_groups, "tty0");
3446         if (IS_ERR(tty0dev))
3447                 tty0dev = NULL;
3448
3449         vcs_init();
3450
3451         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3452         if (!console_driver)
3453                 panic("Couldn't allocate console driver\n");
3454
3455         console_driver->name = "tty";
3456         console_driver->name_base = 1;
3457         console_driver->major = TTY_MAJOR;
3458         console_driver->minor_start = 1;
3459         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3460         console_driver->init_termios = tty_std_termios;
3461         if (default_utf8)
3462                 console_driver->init_termios.c_iflag |= IUTF8;
3463         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3464         tty_set_operations(console_driver, &con_ops);
3465         if (tty_register_driver(console_driver))
3466                 panic("Couldn't register console driver\n");
3467         kbd_init();
3468         console_map_init();
3469 #ifdef CONFIG_MDA_CONSOLE
3470         mda_console_init();
3471 #endif
3472         return 0;
3473 }
3474
3475 #ifndef VT_SINGLE_DRIVER
3476
3477 static struct class *vtconsole_class;
3478
3479 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3480                            int deflt)
3481 {
3482         struct module *owner = csw->owner;
3483         const char *desc = NULL;
3484         struct con_driver *con_driver;
3485         int i, j = -1, k = -1, retval = -ENODEV;
3486
3487         if (!try_module_get(owner))
3488                 return -ENODEV;
3489
3490         WARN_CONSOLE_UNLOCKED();
3491
3492         /* check if driver is registered */
3493         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3494                 con_driver = &registered_con_driver[i];
3495
3496                 if (con_driver->con == csw) {
3497                         desc = con_driver->desc;
3498                         retval = 0;
3499                         break;
3500                 }
3501         }
3502
3503         if (retval)
3504                 goto err;
3505
3506         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3507                 csw->con_startup();
3508                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3509         }
3510
3511         if (deflt) {
3512                 if (conswitchp)
3513                         module_put(conswitchp->owner);
3514
3515                 __module_get(owner);
3516                 conswitchp = csw;
3517         }
3518
3519         first = max(first, con_driver->first);
3520         last = min(last, con_driver->last);
3521
3522         for (i = first; i <= last; i++) {
3523                 int old_was_color;
3524                 struct vc_data *vc = vc_cons[i].d;
3525
3526                 if (con_driver_map[i])
3527                         module_put(con_driver_map[i]->owner);
3528                 __module_get(owner);
3529                 con_driver_map[i] = csw;
3530
3531                 if (!vc || !vc->vc_sw)
3532                         continue;
3533
3534                 j = i;
3535
3536                 if (con_is_visible(vc)) {
3537                         k = i;
3538                         save_screen(vc);
3539                 }
3540
3541                 old_was_color = vc->vc_can_do_color;
3542                 vc->vc_sw->con_deinit(vc);
3543                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3544                 visual_init(vc, i, 0);
3545                 set_origin(vc);
3546                 update_attr(vc);
3547
3548                 /* If the console changed between mono <-> color, then
3549                  * the attributes in the screenbuf will be wrong.  The
3550                  * following resets all attributes to something sane.
3551                  */
3552                 if (old_was_color != vc->vc_can_do_color)
3553                         clear_buffer_attributes(vc);
3554         }
3555
3556         pr_info("Console: switching ");
3557         if (!deflt)
3558                 pr_cont("consoles %d-%d ", first + 1, last + 1);
3559         if (j >= 0) {
3560                 struct vc_data *vc = vc_cons[j].d;
3561
3562                 pr_cont("to %s %s %dx%d\n",
3563                         vc->vc_can_do_color ? "colour" : "mono",
3564                         desc, vc->vc_cols, vc->vc_rows);
3565
3566                 if (k >= 0) {
3567                         vc = vc_cons[k].d;
3568                         update_screen(vc);
3569                 }
3570         } else {
3571                 pr_cont("to %s\n", desc);
3572         }
3573
3574         retval = 0;
3575 err:
3576         module_put(owner);
3577         return retval;
3578 };
3579
3580
3581 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3582 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3583 {
3584         struct module *owner = csw->owner;
3585         const struct consw *defcsw = NULL;
3586         struct con_driver *con_driver = NULL, *con_back = NULL;
3587         int i, retval = -ENODEV;
3588
3589         if (!try_module_get(owner))
3590                 return -ENODEV;
3591
3592         WARN_CONSOLE_UNLOCKED();
3593
3594         /* check if driver is registered and if it is unbindable */
3595         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3596                 con_driver = &registered_con_driver[i];
3597
3598                 if (con_driver->con == csw &&
3599                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3600                         retval = 0;
3601                         break;
3602                 }
3603         }
3604
3605         if (retval)
3606                 goto err;
3607
3608         retval = -ENODEV;
3609
3610         /* check if backup driver exists */
3611         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3612                 con_back = &registered_con_driver[i];
3613
3614                 if (con_back->con && con_back->con != csw) {
3615                         defcsw = con_back->con;
3616                         retval = 0;
3617                         break;
3618                 }
3619         }
3620
3621         if (retval)
3622                 goto err;
3623
3624         if (!con_is_bound(csw))
3625                 goto err;
3626
3627         first = max(first, con_driver->first);
3628         last = min(last, con_driver->last);
3629
3630         for (i = first; i <= last; i++) {
3631                 if (con_driver_map[i] == csw) {
3632                         module_put(csw->owner);
3633                         con_driver_map[i] = NULL;
3634                 }
3635         }
3636
3637         if (!con_is_bound(defcsw)) {
3638                 const struct consw *defconsw = conswitchp;
3639
3640                 defcsw->con_startup();
3641                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3642                 /*
3643                  * vgacon may change the default driver to point
3644                  * to dummycon, we restore it here...
3645                  */
3646                 conswitchp = defconsw;
3647         }
3648
3649         if (!con_is_bound(csw))
3650                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3651
3652         /* ignore return value, binding should not fail */
3653         do_bind_con_driver(defcsw, first, last, deflt);
3654 err:
3655         module_put(owner);
3656         return retval;
3657
3658 }
3659 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3660
3661 static int vt_bind(struct con_driver *con)
3662 {
3663         const struct consw *defcsw = NULL, *csw = NULL;
3664         int i, more = 1, first = -1, last = -1, deflt = 0;
3665
3666         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3667                 goto err;
3668
3669         csw = con->con;
3670
3671         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3672                 struct con_driver *con = &registered_con_driver[i];
3673
3674                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3675                         defcsw = con->con;
3676                         break;
3677                 }
3678         }
3679
3680         if (!defcsw)
3681                 goto err;
3682
3683         while (more) {
3684                 more = 0;
3685
3686                 for (i = con->first; i <= con->last; i++) {
3687                         if (con_driver_map[i] == defcsw) {
3688                                 if (first == -1)
3689                                         first = i;
3690                                 last = i;
3691                                 more = 1;
3692                         } else if (first != -1)
3693                                 break;
3694                 }
3695
3696                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3697                         deflt = 1;
3698
3699                 if (first != -1)
3700                         do_bind_con_driver(csw, first, last, deflt);
3701
3702                 first = -1;
3703                 last = -1;
3704                 deflt = 0;
3705         }
3706
3707 err:
3708         return 0;
3709 }
3710
3711 static int vt_unbind(struct con_driver *con)
3712 {
3713         const struct consw *csw = NULL;
3714         int i, more = 1, first = -1, last = -1, deflt = 0;
3715         int ret;
3716
3717         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3718                 goto err;
3719
3720         csw = con->con;
3721
3722         while (more) {
3723                 more = 0;
3724
3725                 for (i = con->first; i <= con->last; i++) {
3726                         if (con_driver_map[i] == csw) {
3727                                 if (first == -1)
3728                                         first = i;
3729                                 last = i;
3730                                 more = 1;
3731                         } else if (first != -1)
3732                                 break;
3733                 }
3734
3735                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3736                         deflt = 1;
3737
3738                 if (first != -1) {
3739                         ret = do_unbind_con_driver(csw, first, last, deflt);
3740                         if (ret != 0)
3741                                 return ret;
3742                 }
3743
3744                 first = -1;
3745                 last = -1;
3746                 deflt = 0;
3747         }
3748
3749 err:
3750         return 0;
3751 }
3752 #else
3753 static inline int vt_bind(struct con_driver *con)
3754 {
3755         return 0;
3756 }
3757 static inline int vt_unbind(struct con_driver *con)
3758 {
3759         return 0;
3760 }
3761 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3762
3763 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3764                           const char *buf, size_t count)
3765 {
3766         struct con_driver *con = dev_get_drvdata(dev);
3767         int bind = simple_strtoul(buf, NULL, 0);
3768
3769         console_lock();
3770
3771         if (bind)
3772                 vt_bind(con);
3773         else
3774                 vt_unbind(con);
3775
3776         console_unlock();
3777
3778         return count;
3779 }
3780
3781 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3782                          char *buf)
3783 {
3784         struct con_driver *con = dev_get_drvdata(dev);
3785         int bind;
3786
3787         console_lock();
3788         bind = con_is_bound(con->con);
3789         console_unlock();
3790
3791         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3792 }
3793
3794 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3795                          char *buf)
3796 {
3797         struct con_driver *con = dev_get_drvdata(dev);
3798
3799         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3800                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3801                          con->desc);
3802
3803 }
3804
3805 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3806 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3807
3808 static struct attribute *con_dev_attrs[] = {
3809         &dev_attr_bind.attr,
3810         &dev_attr_name.attr,
3811         NULL
3812 };
3813
3814 ATTRIBUTE_GROUPS(con_dev);
3815
3816 static int vtconsole_init_device(struct con_driver *con)
3817 {
3818         con->flag |= CON_DRIVER_FLAG_ATTR;
3819         return 0;
3820 }
3821
3822 static void vtconsole_deinit_device(struct con_driver *con)
3823 {
3824         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3825 }
3826
3827 /**
3828  * con_is_bound - checks if driver is bound to the console
3829  * @csw: console driver
3830  *
3831  * RETURNS: zero if unbound, nonzero if bound
3832  *
3833  * Drivers can call this and if zero, they should release
3834  * all resources allocated on con_startup()
3835  */
3836 int con_is_bound(const struct consw *csw)
3837 {
3838         int i, bound = 0;
3839
3840         WARN_CONSOLE_UNLOCKED();
3841
3842         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3843                 if (con_driver_map[i] == csw) {
3844                         bound = 1;
3845                         break;
3846                 }
3847         }
3848
3849         return bound;
3850 }
3851 EXPORT_SYMBOL(con_is_bound);
3852
3853 /**
3854  * con_is_visible - checks whether the current console is visible
3855  * @vc: virtual console
3856  *
3857  * RETURNS: zero if not visible, nonzero if visible
3858  */
3859 bool con_is_visible(const struct vc_data *vc)
3860 {
3861         WARN_CONSOLE_UNLOCKED();
3862
3863         return *vc->vc_display_fg == vc;
3864 }
3865 EXPORT_SYMBOL(con_is_visible);
3866
3867 /**
3868  * con_debug_enter - prepare the console for the kernel debugger
3869  * @sw: console driver
3870  *
3871  * Called when the console is taken over by the kernel debugger, this
3872  * function needs to save the current console state, then put the console
3873  * into a state suitable for the kernel debugger.
3874  *
3875  * RETURNS:
3876  * Zero on success, nonzero if a failure occurred when trying to prepare
3877  * the console for the debugger.
3878  */
3879 int con_debug_enter(struct vc_data *vc)
3880 {
3881         int ret = 0;
3882
3883         saved_fg_console = fg_console;
3884         saved_last_console = last_console;
3885         saved_want_console = want_console;
3886         saved_vc_mode = vc->vc_mode;
3887         saved_console_blanked = console_blanked;
3888         vc->vc_mode = KD_TEXT;
3889         console_blanked = 0;
3890         if (vc->vc_sw->con_debug_enter)
3891                 ret = vc->vc_sw->con_debug_enter(vc);
3892 #ifdef CONFIG_KGDB_KDB
3893         /* Set the initial LINES variable if it is not already set */
3894         if (vc->vc_rows < 999) {
3895                 int linecount;
3896                 char lns[4];
3897                 const char *setargs[3] = {
3898                         "set",
3899                         "LINES",
3900                         lns,
3901                 };
3902                 if (kdbgetintenv(setargs[0], &linecount)) {
3903                         snprintf(lns, 4, "%i", vc->vc_rows);
3904                         kdb_set(2, setargs);
3905                 }
3906         }
3907         if (vc->vc_cols < 999) {
3908                 int colcount;
3909                 char cols[4];
3910                 const char *setargs[3] = {
3911                         "set",
3912                         "COLUMNS",
3913                         cols,
3914                 };
3915                 if (kdbgetintenv(setargs[0], &colcount)) {
3916                         snprintf(cols, 4, "%i", vc->vc_cols);
3917                         kdb_set(2, setargs);
3918                 }
3919         }
3920 #endif /* CONFIG_KGDB_KDB */
3921         return ret;
3922 }
3923 EXPORT_SYMBOL_GPL(con_debug_enter);
3924
3925 /**
3926  * con_debug_leave - restore console state
3927  * @sw: console driver
3928  *
3929  * Restore the console state to what it was before the kernel debugger
3930  * was invoked.
3931  *
3932  * RETURNS:
3933  * Zero on success, nonzero if a failure occurred when trying to restore
3934  * the console.
3935  */
3936 int con_debug_leave(void)
3937 {
3938         struct vc_data *vc;
3939         int ret = 0;
3940
3941         fg_console = saved_fg_console;
3942         last_console = saved_last_console;
3943         want_console = saved_want_console;
3944         console_blanked = saved_console_blanked;
3945         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3946
3947         vc = vc_cons[fg_console].d;
3948         if (vc->vc_sw->con_debug_leave)
3949                 ret = vc->vc_sw->con_debug_leave(vc);
3950         return ret;
3951 }
3952 EXPORT_SYMBOL_GPL(con_debug_leave);
3953
3954 static int do_register_con_driver(const struct consw *csw, int first, int last)
3955 {
3956         struct module *owner = csw->owner;
3957         struct con_driver *con_driver;
3958         const char *desc;
3959         int i, retval;
3960
3961         WARN_CONSOLE_UNLOCKED();
3962
3963         if (!try_module_get(owner))
3964                 return -ENODEV;
3965
3966         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3967                 con_driver = &registered_con_driver[i];
3968
3969                 /* already registered */
3970                 if (con_driver->con == csw) {
3971                         retval = -EBUSY;
3972                         goto err;
3973                 }
3974         }
3975
3976         desc = csw->con_startup();
3977         if (!desc) {
3978                 retval = -ENODEV;
3979                 goto err;
3980         }
3981
3982         retval = -EINVAL;
3983
3984         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3985                 con_driver = &registered_con_driver[i];
3986
3987                 if (con_driver->con == NULL &&
3988                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3989                         con_driver->con = csw;
3990                         con_driver->desc = desc;
3991                         con_driver->node = i;
3992                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3993                                            CON_DRIVER_FLAG_INIT;
3994                         con_driver->first = first;
3995                         con_driver->last = last;
3996                         retval = 0;
3997                         break;
3998                 }
3999         }
4000
4001         if (retval)
4002                 goto err;
4003
4004         con_driver->dev =
4005                 device_create_with_groups(vtconsole_class, NULL,
4006                                           MKDEV(0, con_driver->node),
4007                                           con_driver, con_dev_groups,
4008                                           "vtcon%i", con_driver->node);
4009         if (IS_ERR(con_driver->dev)) {
4010                 pr_warn("Unable to create device for %s; errno = %ld\n",
4011                         con_driver->desc, PTR_ERR(con_driver->dev));
4012                 con_driver->dev = NULL;
4013         } else {
4014                 vtconsole_init_device(con_driver);
4015         }
4016
4017 err:
4018         module_put(owner);
4019         return retval;
4020 }
4021
4022
4023 /**
4024  * do_unregister_con_driver - unregister console driver from console layer
4025  * @csw: console driver
4026  *
4027  * DESCRIPTION: All drivers that registers to the console layer must
4028  * call this function upon exit, or if the console driver is in a state
4029  * where it won't be able to handle console services, such as the
4030  * framebuffer console without loaded framebuffer drivers.
4031  *
4032  * The driver must unbind first prior to unregistration.
4033  */
4034 int do_unregister_con_driver(const struct consw *csw)
4035 {
4036         int i;
4037
4038         /* cannot unregister a bound driver */
4039         if (con_is_bound(csw))
4040                 return -EBUSY;
4041
4042         if (csw == conswitchp)
4043                 return -EINVAL;
4044
4045         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4046                 struct con_driver *con_driver = &registered_con_driver[i];
4047
4048                 if (con_driver->con == csw) {
4049                         /*
4050                          * Defer the removal of the sysfs entries since that
4051                          * will acquire the kernfs s_active lock and we can't
4052                          * acquire this lock while holding the console lock:
4053                          * the unbind sysfs entry imposes already the opposite
4054                          * order. Reset con already here to prevent any later
4055                          * lookup to succeed and mark this slot as zombie, so
4056                          * it won't get reused until we complete the removal
4057                          * in the deferred work.
4058                          */
4059                         con_driver->con = NULL;
4060                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4061                         schedule_work(&con_driver_unregister_work);
4062
4063                         return 0;
4064                 }
4065         }
4066
4067         return -ENODEV;
4068 }
4069 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4070
4071 static void con_driver_unregister_callback(struct work_struct *ignored)
4072 {
4073         int i;
4074
4075         console_lock();
4076
4077         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4078                 struct con_driver *con_driver = &registered_con_driver[i];
4079
4080                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4081                         continue;
4082
4083                 console_unlock();
4084
4085                 vtconsole_deinit_device(con_driver);
4086                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4087
4088                 console_lock();
4089
4090                 if (WARN_ON_ONCE(con_driver->con))
4091                         con_driver->con = NULL;
4092                 con_driver->desc = NULL;
4093                 con_driver->dev = NULL;
4094                 con_driver->node = 0;
4095                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4096                 con_driver->flag = 0;
4097                 con_driver->first = 0;
4098                 con_driver->last = 0;
4099         }
4100
4101         console_unlock();
4102 }
4103
4104 /*
4105  *      If we support more console drivers, this function is used
4106  *      when a driver wants to take over some existing consoles
4107  *      and become default driver for newly opened ones.
4108  *
4109  *      do_take_over_console is basically a register followed by bind
4110  */
4111 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4112 {
4113         int err;
4114
4115         err = do_register_con_driver(csw, first, last);
4116         /*
4117          * If we get an busy error we still want to bind the console driver
4118          * and return success, as we may have unbound the console driver
4119          * but not unregistered it.
4120          */
4121         if (err == -EBUSY)
4122                 err = 0;
4123         if (!err)
4124                 do_bind_con_driver(csw, first, last, deflt);
4125
4126         return err;
4127 }
4128 EXPORT_SYMBOL_GPL(do_take_over_console);
4129
4130
4131 /*
4132  * give_up_console is a wrapper to unregister_con_driver. It will only
4133  * work if driver is fully unbound.
4134  */
4135 void give_up_console(const struct consw *csw)
4136 {
4137         console_lock();
4138         do_unregister_con_driver(csw);
4139         console_unlock();
4140 }
4141
4142 static int __init vtconsole_class_init(void)
4143 {
4144         int i;
4145
4146         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4147         if (IS_ERR(vtconsole_class)) {
4148                 pr_warn("Unable to create vt console class; errno = %ld\n",
4149                         PTR_ERR(vtconsole_class));
4150                 vtconsole_class = NULL;
4151         }
4152
4153         /* Add system drivers to sysfs */
4154         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4155                 struct con_driver *con = &registered_con_driver[i];
4156
4157                 if (con->con && !con->dev) {
4158                         con->dev =
4159                                 device_create_with_groups(vtconsole_class, NULL,
4160                                                           MKDEV(0, con->node),
4161                                                           con, con_dev_groups,
4162                                                           "vtcon%i", con->node);
4163
4164                         if (IS_ERR(con->dev)) {
4165                                 pr_warn("Unable to create device for %s; errno = %ld\n",
4166                                         con->desc, PTR_ERR(con->dev));
4167                                 con->dev = NULL;
4168                         } else {
4169                                 vtconsole_init_device(con);
4170                         }
4171                 }
4172         }
4173
4174         return 0;
4175 }
4176 postcore_initcall(vtconsole_class_init);
4177
4178 #endif
4179
4180 /*
4181  *      Screen blanking
4182  */
4183
4184 static int set_vesa_blanking(char __user *p)
4185 {
4186         unsigned int mode;
4187
4188         if (get_user(mode, p + 1))
4189                 return -EFAULT;
4190
4191         vesa_blank_mode = (mode < 4) ? mode : 0;
4192         return 0;
4193 }
4194
4195 void do_blank_screen(int entering_gfx)
4196 {
4197         struct vc_data *vc = vc_cons[fg_console].d;
4198         int i;
4199
4200         might_sleep();
4201
4202         WARN_CONSOLE_UNLOCKED();
4203
4204         if (console_blanked) {
4205                 if (blank_state == blank_vesa_wait) {
4206                         blank_state = blank_off;
4207                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4208                 }
4209                 return;
4210         }
4211
4212         /* entering graphics mode? */
4213         if (entering_gfx) {
4214                 hide_cursor(vc);
4215                 save_screen(vc);
4216                 vc->vc_sw->con_blank(vc, -1, 1);
4217                 console_blanked = fg_console + 1;
4218                 blank_state = blank_off;
4219                 set_origin(vc);
4220                 return;
4221         }
4222
4223         blank_state = blank_off;
4224
4225         /* don't blank graphics */
4226         if (vc->vc_mode != KD_TEXT) {
4227                 console_blanked = fg_console + 1;
4228                 return;
4229         }
4230
4231         hide_cursor(vc);
4232         del_timer_sync(&console_timer);
4233         blank_timer_expired = 0;
4234
4235         save_screen(vc);
4236         /* In case we need to reset origin, blanking hook returns 1 */
4237         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4238         console_blanked = fg_console + 1;
4239         if (i)
4240                 set_origin(vc);
4241
4242         if (console_blank_hook && console_blank_hook(1))
4243                 return;
4244
4245         if (vesa_off_interval && vesa_blank_mode) {
4246                 blank_state = blank_vesa_wait;
4247                 mod_timer(&console_timer, jiffies + vesa_off_interval);
4248         }
4249         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4250 }
4251 EXPORT_SYMBOL(do_blank_screen);
4252
4253 /*
4254  * Called by timer as well as from vt_console_driver
4255  */
4256 void do_unblank_screen(int leaving_gfx)
4257 {
4258         struct vc_data *vc;
4259
4260         /* This should now always be called from a "sane" (read: can schedule)
4261          * context for the sake of the low level drivers, except in the special
4262          * case of oops_in_progress
4263          */
4264         if (!oops_in_progress)
4265                 might_sleep();
4266
4267         WARN_CONSOLE_UNLOCKED();
4268
4269         ignore_poke = 0;
4270         if (!console_blanked)
4271                 return;
4272         if (!vc_cons_allocated(fg_console)) {
4273                 /* impossible */
4274                 pr_warn("unblank_screen: tty %d not allocated ??\n",
4275                         fg_console + 1);
4276                 return;
4277         }
4278         vc = vc_cons[fg_console].d;
4279         if (vc->vc_mode != KD_TEXT)
4280                 return; /* but leave console_blanked != 0 */
4281
4282         if (blankinterval) {
4283                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4284                 blank_state = blank_normal_wait;
4285         }
4286
4287         console_blanked = 0;
4288         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4289                 /* Low-level driver cannot restore -> do it ourselves */
4290                 update_screen(vc);
4291         if (console_blank_hook)
4292                 console_blank_hook(0);
4293         set_palette(vc);
4294         set_cursor(vc);
4295         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4296 }
4297 EXPORT_SYMBOL(do_unblank_screen);
4298
4299 /*
4300  * This is called by the outside world to cause a forced unblank, mostly for
4301  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4302  * call it with 1 as an argument and so force a mode restore... that may kill
4303  * X or at least garbage the screen but would also make the Oops visible...
4304  */
4305 void unblank_screen(void)
4306 {
4307         do_unblank_screen(0);
4308 }
4309
4310 /*
4311  * We defer the timer blanking to work queue so it can take the console mutex
4312  * (console operations can still happen at irq time, but only from printk which
4313  * has the console mutex. Not perfect yet, but better than no locking
4314  */
4315 static void blank_screen_t(struct timer_list *unused)
4316 {
4317         blank_timer_expired = 1;
4318         schedule_work(&console_work);
4319 }
4320
4321 void poke_blanked_console(void)
4322 {
4323         WARN_CONSOLE_UNLOCKED();
4324
4325         /* Add this so we quickly catch whoever might call us in a non
4326          * safe context. Nowadays, unblank_screen() isn't to be called in
4327          * atomic contexts and is allowed to schedule (with the special case
4328          * of oops_in_progress, but that isn't of any concern for this
4329          * function. --BenH.
4330          */
4331         might_sleep();
4332
4333         /* This isn't perfectly race free, but a race here would be mostly harmless,
4334          * at worse, we'll do a spurrious blank and it's unlikely
4335          */
4336         del_timer(&console_timer);
4337         blank_timer_expired = 0;
4338
4339         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4340                 return;
4341         if (console_blanked)
4342                 unblank_screen();
4343         else if (blankinterval) {
4344                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4345                 blank_state = blank_normal_wait;
4346         }
4347 }
4348
4349 /*
4350  *      Palettes
4351  */
4352
4353 static void set_palette(struct vc_data *vc)
4354 {
4355         WARN_CONSOLE_UNLOCKED();
4356
4357         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4358                 vc->vc_sw->con_set_palette(vc, color_table);
4359 }
4360
4361 /*
4362  * Load palette into the DAC registers. arg points to a colour
4363  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4364  */
4365
4366 int con_set_cmap(unsigned char __user *arg)
4367 {
4368         int i, j, k;
4369         unsigned char colormap[3*16];
4370
4371         if (copy_from_user(colormap, arg, sizeof(colormap)))
4372                 return -EFAULT;
4373
4374         console_lock();
4375         for (i = k = 0; i < 16; i++) {
4376                 default_red[i] = colormap[k++];
4377                 default_grn[i] = colormap[k++];
4378                 default_blu[i] = colormap[k++];
4379         }
4380         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4381                 if (!vc_cons_allocated(i))
4382                         continue;
4383                 for (j = k = 0; j < 16; j++) {
4384                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4385                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4386                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4387                 }
4388                 set_palette(vc_cons[i].d);
4389         }
4390         console_unlock();
4391
4392         return 0;
4393 }
4394
4395 int con_get_cmap(unsigned char __user *arg)
4396 {
4397         int i, k;
4398         unsigned char colormap[3*16];
4399
4400         console_lock();
4401         for (i = k = 0; i < 16; i++) {
4402                 colormap[k++] = default_red[i];
4403                 colormap[k++] = default_grn[i];
4404                 colormap[k++] = default_blu[i];
4405         }
4406         console_unlock();
4407
4408         if (copy_to_user(arg, colormap, sizeof(colormap)))
4409                 return -EFAULT;
4410
4411         return 0;
4412 }
4413
4414 void reset_palette(struct vc_data *vc)
4415 {
4416         int j, k;
4417         for (j=k=0; j<16; j++) {
4418                 vc->vc_palette[k++] = default_red[j];
4419                 vc->vc_palette[k++] = default_grn[j];
4420                 vc->vc_palette[k++] = default_blu[j];
4421         }
4422         set_palette(vc);
4423 }
4424
4425 /*
4426  *  Font switching
4427  *
4428  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4429  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4430  *  depending on width) reserved for each character which is kinda wasty, but
4431  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4432  *  is up to the actual low-level console-driver convert data into its favorite
4433  *  format (maybe we should add a `fontoffset' field to the `display'
4434  *  structure so we won't have to convert the fontdata all the time.
4435  *  /Jes
4436  */
4437
4438 #define max_font_size 65536
4439
4440 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4441 {
4442         struct console_font font;
4443         int rc = -EINVAL;
4444         int c;
4445
4446         if (op->data) {
4447                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4448                 if (!font.data)
4449                         return -ENOMEM;
4450         } else
4451                 font.data = NULL;
4452
4453         console_lock();
4454         if (vc->vc_mode != KD_TEXT)
4455                 rc = -EINVAL;
4456         else if (vc->vc_sw->con_font_get)
4457                 rc = vc->vc_sw->con_font_get(vc, &font);
4458         else
4459                 rc = -ENOSYS;
4460         console_unlock();
4461
4462         if (rc)
4463                 goto out;
4464
4465         c = (font.width+7)/8 * 32 * font.charcount;
4466
4467         if (op->data && font.charcount > op->charcount)
4468                 rc = -ENOSPC;
4469         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4470                 if (font.width > op->width || font.height > op->height)
4471                         rc = -ENOSPC;
4472         } else {
4473                 if (font.width != 8)
4474                         rc = -EIO;
4475                 else if ((op->height && font.height > op->height) ||
4476                          font.height > 32)
4477                         rc = -ENOSPC;
4478         }
4479         if (rc)
4480                 goto out;
4481
4482         op->height = font.height;
4483         op->width = font.width;
4484         op->charcount = font.charcount;
4485
4486         if (op->data && copy_to_user(op->data, font.data, c))
4487                 rc = -EFAULT;
4488
4489 out:
4490         kfree(font.data);
4491         return rc;
4492 }
4493
4494 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4495 {
4496         struct console_font font;
4497         int rc = -EINVAL;
4498         int size;
4499
4500         if (vc->vc_mode != KD_TEXT)
4501                 return -EINVAL;
4502         if (!op->data)
4503                 return -EINVAL;
4504         if (op->charcount > 512)
4505                 return -EINVAL;
4506         if (op->width <= 0 || op->width > 32 || op->height > 32)
4507                 return -EINVAL;
4508         size = (op->width+7)/8 * 32 * op->charcount;
4509         if (size > max_font_size)
4510                 return -ENOSPC;
4511
4512         font.data = memdup_user(op->data, size);
4513         if (IS_ERR(font.data))
4514                 return PTR_ERR(font.data);
4515
4516         if (!op->height) {              /* Need to guess font height [compat] */
4517                 int h, i;
4518                 u8 *charmap = font.data;
4519
4520                 /*
4521                  * If from KDFONTOP ioctl, don't allow things which can be done
4522                  * in userland,so that we can get rid of this soon
4523                  */
4524                 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4525                         kfree(font.data);
4526                         return -EINVAL;
4527                 }
4528
4529                 for (h = 32; h > 0; h--)
4530                         for (i = 0; i < op->charcount; i++)
4531                                 if (charmap[32*i+h-1])
4532                                         goto nonzero;
4533
4534                 kfree(font.data);
4535                 return -EINVAL;
4536
4537         nonzero:
4538                 op->height = h;
4539         }
4540
4541         font.charcount = op->charcount;
4542         font.width = op->width;
4543         font.height = op->height;
4544
4545         console_lock();
4546         if (vc->vc_mode != KD_TEXT)
4547                 rc = -EINVAL;
4548         else if (vc->vc_sw->con_font_set)
4549                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4550         else
4551                 rc = -ENOSYS;
4552         console_unlock();
4553         kfree(font.data);
4554         return rc;
4555 }
4556
4557 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4558 {
4559         struct console_font font = {.width = op->width, .height = op->height};
4560         char name[MAX_FONT_NAME];
4561         char *s = name;
4562         int rc;
4563
4564
4565         if (!op->data)
4566                 s = NULL;
4567         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4568                 return -EFAULT;
4569         else
4570                 name[MAX_FONT_NAME - 1] = 0;
4571
4572         console_lock();
4573         if (vc->vc_mode != KD_TEXT) {
4574                 console_unlock();
4575                 return -EINVAL;
4576         }
4577         if (vc->vc_sw->con_font_default)
4578                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4579         else
4580                 rc = -ENOSYS;
4581         console_unlock();
4582         if (!rc) {
4583                 op->width = font.width;
4584                 op->height = font.height;
4585         }
4586         return rc;
4587 }
4588
4589 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4590 {
4591         int con = op->height;
4592         int rc;
4593
4594
4595         console_lock();
4596         if (vc->vc_mode != KD_TEXT)
4597                 rc = -EINVAL;
4598         else if (!vc->vc_sw->con_font_copy)
4599                 rc = -ENOSYS;
4600         else if (con < 0 || !vc_cons_allocated(con))
4601                 rc = -ENOTTY;
4602         else if (con == vc->vc_num)     /* nothing to do */
4603                 rc = 0;
4604         else
4605                 rc = vc->vc_sw->con_font_copy(vc, con);
4606         console_unlock();
4607         return rc;
4608 }
4609
4610 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4611 {
4612         switch (op->op) {
4613         case KD_FONT_OP_SET:
4614                 return con_font_set(vc, op);
4615         case KD_FONT_OP_GET:
4616                 return con_font_get(vc, op);
4617         case KD_FONT_OP_SET_DEFAULT:
4618                 return con_font_default(vc, op);
4619         case KD_FONT_OP_COPY:
4620                 return con_font_copy(vc, op);
4621         }
4622         return -ENOSYS;
4623 }
4624
4625 /*
4626  *      Interface exported to selection and vcs.
4627  */
4628
4629 /* used by selection */
4630 u16 screen_glyph(struct vc_data *vc, int offset)
4631 {
4632         u16 w = scr_readw(screenpos(vc, offset, 1));
4633         u16 c = w & 0xff;
4634
4635         if (w & vc->vc_hi_font_mask)
4636                 c |= 0x100;
4637         return c;
4638 }
4639 EXPORT_SYMBOL_GPL(screen_glyph);
4640
4641 u32 screen_glyph_unicode(struct vc_data *vc, int n)
4642 {
4643         struct uni_screen *uniscr = get_vc_uniscr(vc);
4644
4645         if (uniscr)
4646                 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4647         return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4648 }
4649 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4650
4651 /* used by vcs - note the word offset */
4652 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4653 {
4654         return screenpos(vc, 2 * w_offset, viewed);
4655 }
4656 EXPORT_SYMBOL_GPL(screen_pos);
4657
4658 void getconsxy(struct vc_data *vc, unsigned char *p)
4659 {
4660         /* clamp values if they don't fit */
4661         p[0] = min(vc->vc_x, 0xFFu);
4662         p[1] = min(vc->vc_y, 0xFFu);
4663 }
4664
4665 void putconsxy(struct vc_data *vc, unsigned char *p)
4666 {
4667         hide_cursor(vc);
4668         gotoxy(vc, p[0], p[1]);
4669         set_cursor(vc);
4670 }
4671
4672 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4673 {
4674         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4675                 return softcursor_original;
4676         return scr_readw(org);
4677 }
4678
4679 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4680 {
4681         scr_writew(val, org);
4682         if ((unsigned long)org == vc->vc_pos) {
4683                 softcursor_original = -1;
4684                 add_softcursor(vc);
4685         }
4686 }
4687
4688 void vcs_scr_updated(struct vc_data *vc)
4689 {
4690         notify_update(vc);
4691 }
4692
4693 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4694                 unsigned int rolled_over, void *base, unsigned int size)
4695 {
4696         unsigned long ubase = (unsigned long)base;
4697         ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4698         ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4699         ptrdiff_t origin = (void *)c->vc_origin - base;
4700         int margin = c->vc_size_row * 4;
4701         int from, wrap, from_off, avail;
4702
4703         /* Turn scrollback off */
4704         if (!lines) {
4705                 c->vc_visible_origin = c->vc_origin;
4706                 return;
4707         }
4708
4709         /* Do we have already enough to allow jumping from 0 to the end? */
4710         if (rolled_over > scr_end + margin) {
4711                 from = scr_end;
4712                 wrap = rolled_over + c->vc_size_row;
4713         } else {
4714                 from = 0;
4715                 wrap = size;
4716         }
4717
4718         from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4719         avail = (origin - from + wrap) % wrap;
4720
4721         /* Only a little piece would be left? Show all incl. the piece! */
4722         if (avail < 2 * margin)
4723                 margin = 0;
4724         if (from_off < margin)
4725                 from_off = 0;
4726         if (from_off > avail - margin)
4727                 from_off = avail;
4728
4729         c->vc_visible_origin = ubase + (from + from_off) % wrap;
4730 }
4731 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4732
4733 /*
4734  *      Visible symbols for modules
4735  */
4736
4737 EXPORT_SYMBOL(color_table);
4738 EXPORT_SYMBOL(default_red);
4739 EXPORT_SYMBOL(default_grn);
4740 EXPORT_SYMBOL(default_blu);
4741 EXPORT_SYMBOL(update_region);
4742 EXPORT_SYMBOL(redraw_screen);
4743 EXPORT_SYMBOL(vc_resize);
4744 EXPORT_SYMBOL(fg_console);
4745 EXPORT_SYMBOL(console_blank_hook);
4746 EXPORT_SYMBOL(console_blanked);
4747 EXPORT_SYMBOL(vc_cons);
4748 EXPORT_SYMBOL(global_cursor_default);
4749 #ifndef VT_SINGLE_DRIVER
4750 EXPORT_SYMBOL(give_up_console);
4751 #endif