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_is_sel(vc))
 894                 clear_selection();
 895
 896         vc->vc_sw->con_cursor(vc, CM_ERASE);
 897         hide_softcursor(vc);
 898 }
 899
 900 static void set_cursor(struct vc_data *vc)
 901 {
 902         if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
 903                 return;
 904         if (vc->vc_deccm) {
 905                 if (vc_is_sel(vc))
 906                         clear_selection();
 907                 add_softcursor(vc);
 908                 if ((vc->vc_cursor_type & 0x0f) != 1)
 909                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 910         } else
 911                 hide_cursor(vc);
 912 }
 913
 914 static void set_origin(struct vc_data *vc)
 915 {
 916         WARN_CONSOLE_UNLOCKED();
 917
 918         if (!con_is_visible(vc) ||
 919             !vc->vc_sw->con_set_origin ||
 920             !vc->vc_sw->con_set_origin(vc))
 921                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 922         vc->vc_visible_origin = vc->vc_origin;
 923         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 924         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 925 }
 926
 927 static void save_screen(struct vc_data *vc)
 928 {
 929         WARN_CONSOLE_UNLOCKED();
 930
 931         if (vc->vc_sw->con_save_screen)
 932                 vc->vc_sw->con_save_screen(vc);
 933 }
 934
 935 static void flush_scrollback(struct vc_data *vc)
 936 {
 937         WARN_CONSOLE_UNLOCKED();
 938
 939         set_origin(vc);
 940         if (vc->vc_sw->con_flush_scrollback) {
 941                 vc->vc_sw->con_flush_scrollback(vc);
 942         } else if (con_is_visible(vc)) {
 943                 /*
 944                  * When no con_flush_scrollback method is provided then the
 945                  * legacy way for flushing the scrollback buffer is to use
 946                  * a side effect of the con_switch method. We do it only on
 947                  * the foreground console as background consoles have no
 948                  * scrollback buffers in that case and we obviously don't
 949                  * want to switch to them.
 950                  */
 951                 hide_cursor(vc);
 952                 vc->vc_sw->con_switch(vc);
 953                 set_cursor(vc);
 954         }
 955 }
 956
 957 /*
 958  *      Redrawing of screen
 959  */
 960
 961 void clear_buffer_attributes(struct vc_data *vc)
 962 {
 963         unsigned short *p = (unsigned short *)vc->vc_origin;
 964         int count = vc->vc_screenbuf_size / 2;
 965         int mask = vc->vc_hi_font_mask | 0xff;
 966
 967         for (; count > 0; count--, p++) {
 968                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 969         }
 970 }
 971
 972 void redraw_screen(struct vc_data *vc, int is_switch)
 973 {
 974         int redraw = 0;
 975
 976         WARN_CONSOLE_UNLOCKED();
 977
 978         if (!vc) {
 979                 /* strange ... */
 980                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 981                 return;
 982         }
 983
 984         if (is_switch) {
 985                 struct vc_data *old_vc = vc_cons[fg_console].d;
 986                 if (old_vc == vc)
 987                         return;
 988                 if (!con_is_visible(vc))
 989                         redraw = 1;
 990                 *vc->vc_display_fg = vc;
 991                 fg_console = vc->vc_num;
 992                 hide_cursor(old_vc);
 993                 if (!con_is_visible(old_vc)) {
 994                         save_screen(old_vc);
 995                         set_origin(old_vc);
 996                 }
 997                 if (tty0dev)
 998                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 999         } else {
1000                 hide_cursor(vc);
1001                 redraw = 1;
1002         }
1003
1004         if (redraw) {
1005                 int update;
1006                 int old_was_color = vc->vc_can_do_color;
1007
1008                 set_origin(vc);
1009                 update = vc->vc_sw->con_switch(vc);
1010                 set_palette(vc);
1011                 /*
1012                  * If console changed from mono<->color, the best we can do
1013                  * is to clear the buffer attributes. As it currently stands,
1014                  * rebuilding new attributes from the old buffer is not doable
1015                  * without overly complex code.
1016                  */
1017                 if (old_was_color != vc->vc_can_do_color) {
1018                         update_attr(vc);
1019                         clear_buffer_attributes(vc);
1020                 }
1021
1022                 if (update && vc->vc_mode != KD_GRAPHICS)
1023                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1024         }
1025         set_cursor(vc);
1026         if (is_switch) {
1027                 set_leds();
1028                 compute_shiftstate();
1029                 notify_update(vc);
1030         }
1031 }
1032
1033 /*
1034  *      Allocation, freeing and resizing of VTs.
1035  */
1036
1037 int vc_cons_allocated(unsigned int i)
1038 {
1039         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1040 }
1041
1042 static void visual_init(struct vc_data *vc, int num, int init)
1043 {
1044         /* ++Geert: vc->vc_sw->con_init determines console size */
1045         if (vc->vc_sw)
1046                 module_put(vc->vc_sw->owner);
1047         vc->vc_sw = conswitchp;
1048 #ifndef VT_SINGLE_DRIVER
1049         if (con_driver_map[num])
1050                 vc->vc_sw = con_driver_map[num];
1051 #endif
1052         __module_get(vc->vc_sw->owner);
1053         vc->vc_num = num;
1054         vc->vc_display_fg = &master_display_fg;
1055         if (vc->vc_uni_pagedir_loc)
1056                 con_free_unimap(vc);
1057         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1058         vc->vc_uni_pagedir = NULL;
1059         vc->vc_hi_font_mask = 0;
1060         vc->vc_complement_mask = 0;
1061         vc->vc_can_do_color = 0;
1062         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1063         vc->vc_sw->con_init(vc, init);
1064         if (!vc->vc_complement_mask)
1065                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1066         vc->vc_s_complement_mask = vc->vc_complement_mask;
1067         vc->vc_size_row = vc->vc_cols << 1;
1068         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1069 }
1070
1071
1072 static void visual_deinit(struct vc_data *vc)
1073 {
1074         vc->vc_sw->con_deinit(vc);
1075         module_put(vc->vc_sw->owner);
1076 }
1077
1078 static void vc_port_destruct(struct tty_port *port)
1079 {
1080         struct vc_data *vc = container_of(port, struct vc_data, port);
1081
1082         kfree(vc);
1083 }
1084
1085 static const struct tty_port_operations vc_port_ops = {
1086         .destruct = vc_port_destruct,
1087 };
1088
1089 int vc_allocate(unsigned int currcons)  /* return 0 on success */
1090 {
1091         struct vt_notifier_param param;
1092         struct vc_data *vc;
1093
1094         WARN_CONSOLE_UNLOCKED();
1095
1096         if (currcons >= MAX_NR_CONSOLES)
1097                 return -ENXIO;
1098
1099         if (vc_cons[currcons].d)
1100                 return 0;
1101
1102         /* due to the granularity of kmalloc, we waste some memory here */
1103         /* the alloc is done in two steps, to optimize the common situation
1104            of a 25x80 console (structsize=216, screenbuf_size=4000) */
1105         /* although the numbers above are not valid since long ago, the
1106            point is still up-to-date and the comment still has its value
1107            even if only as a historical artifact.  --mj, July 1998 */
1108         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1109         if (!vc)
1110                 return -ENOMEM;
1111
1112         vc_cons[currcons].d = vc;
1113         tty_port_init(&vc->port);
1114         vc->port.ops = &vc_port_ops;
1115         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1116
1117         visual_init(vc, currcons, 1);
1118
1119         if (!*vc->vc_uni_pagedir_loc)
1120                 con_set_default_unimap(vc);
1121
1122         vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1123         if (!vc->vc_screenbuf)
1124                 goto err_free;
1125
1126         /* If no drivers have overridden us and the user didn't pass a
1127            boot option, default to displaying the cursor */
1128         if (global_cursor_default == -1)
1129                 global_cursor_default = 1;
1130
1131         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1132         vcs_make_sysfs(currcons);
1133         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1134
1135         return 0;
1136 err_free:
1137         visual_deinit(vc);
1138         kfree(vc);
1139         vc_cons[currcons].d = NULL;
1140         return -ENOMEM;
1141 }
1142
1143 static inline int resize_screen(struct vc_data *vc, int width, int height,
1144                                 int user)
1145 {
1146         /* Resizes the resolution of the display adapater */
1147         int err = 0;
1148
1149         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1150                 err = vc->vc_sw->con_resize(vc, width, height, user);
1151
1152         return err;
1153 }
1154
1155 /*
1156  * Change # of rows and columns (0 means unchanged/the size of fg_console)
1157  * [this is to be used together with some user program
1158  * like resize that changes the hardware videomode]
1159  */
1160 #define VC_RESIZE_MAXCOL (32767)
1161 #define VC_RESIZE_MAXROW (32767)
1162
1163 /**
1164  *      vc_do_resize    -       resizing method for the tty
1165  *      @tty: tty being resized
1166  *      @real_tty: real tty (different to tty if a pty/tty pair)
1167  *      @vc: virtual console private data
1168  *      @cols: columns
1169  *      @lines: lines
1170  *
1171  *      Resize a virtual console, clipping according to the actual constraints.
1172  *      If the caller passes a tty structure then update the termios winsize
1173  *      information and perform any necessary signal handling.
1174  *
1175  *      Caller must hold the console semaphore. Takes the termios rwsem and
1176  *      ctrl_lock of the tty IFF a tty is passed.
1177  */
1178
1179 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1180                                 unsigned int cols, unsigned int lines)
1181 {
1182         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1183         unsigned long end;
1184         unsigned int old_rows, old_row_size, first_copied_row;
1185         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1186         unsigned int user;
1187         unsigned short *newscreen;
1188         struct uni_screen *new_uniscr = NULL;
1189
1190         WARN_CONSOLE_UNLOCKED();
1191
1192         if (!vc)
1193                 return -ENXIO;
1194
1195         user = vc->vc_resize_user;
1196         vc->vc_resize_user = 0;
1197
1198         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1199                 return -EINVAL;
1200
1201         new_cols = (cols ? cols : vc->vc_cols);
1202         new_rows = (lines ? lines : vc->vc_rows);
1203         new_row_size = new_cols << 1;
1204         new_screen_size = new_row_size * new_rows;
1205
1206         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1207                 return 0;
1208
1209         if (new_screen_size > (4 << 20))
1210                 return -EINVAL;
1211         newscreen = kzalloc(new_screen_size, GFP_USER);
1212         if (!newscreen)
1213                 return -ENOMEM;
1214
1215         if (get_vc_uniscr(vc)) {
1216                 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1217                 if (!new_uniscr) {
1218                         kfree(newscreen);
1219                         return -ENOMEM;
1220                 }
1221         }
1222
1223         if (vc_is_sel(vc))
1224                 clear_selection();
1225
1226         old_rows = vc->vc_rows;
1227         old_row_size = vc->vc_size_row;
1228
1229         err = resize_screen(vc, new_cols, new_rows, user);
1230         if (err) {
1231                 kfree(newscreen);
1232                 kfree(new_uniscr);
1233                 return err;
1234         }
1235
1236         vc->vc_rows = new_rows;
1237         vc->vc_cols = new_cols;
1238         vc->vc_size_row = new_row_size;
1239         vc->vc_screenbuf_size = new_screen_size;
1240
1241         rlth = min(old_row_size, new_row_size);
1242         rrem = new_row_size - rlth;
1243         old_origin = vc->vc_origin;
1244         new_origin = (long) newscreen;
1245         new_scr_end = new_origin + new_screen_size;
1246
1247         if (vc->vc_y > new_rows) {
1248                 if (old_rows - vc->vc_y < new_rows) {
1249                         /*
1250                          * Cursor near the bottom, copy contents from the
1251                          * bottom of buffer
1252                          */
1253                         first_copied_row = (old_rows - new_rows);
1254                 } else {
1255                         /*
1256                          * Cursor is in no man's land, copy 1/2 screenful
1257                          * from the top and bottom of cursor position
1258                          */
1259                         first_copied_row = (vc->vc_y - new_rows/2);
1260                 }
1261                 old_origin += first_copied_row * old_row_size;
1262         } else
1263                 first_copied_row = 0;
1264         end = old_origin + old_row_size * min(old_rows, new_rows);
1265
1266         vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1267                             get_vc_uniscr(vc), rlth/2, first_copied_row,
1268                             min(old_rows, new_rows));
1269         vc_uniscr_set(vc, new_uniscr);
1270
1271         update_attr(vc);
1272
1273         while (old_origin < end) {
1274                 scr_memcpyw((unsigned short *) new_origin,
1275                             (unsigned short *) old_origin, rlth);
1276                 if (rrem)
1277                         scr_memsetw((void *)(new_origin + rlth),
1278                                     vc->vc_video_erase_char, rrem);
1279                 old_origin += old_row_size;
1280                 new_origin += new_row_size;
1281         }
1282         if (new_scr_end > new_origin)
1283                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1284                             new_scr_end - new_origin);
1285         kfree(vc->vc_screenbuf);
1286         vc->vc_screenbuf = newscreen;
1287         vc->vc_screenbuf_size = new_screen_size;
1288         set_origin(vc);
1289
1290         /* do part of a reset_terminal() */
1291         vc->vc_top = 0;
1292         vc->vc_bottom = vc->vc_rows;
1293         gotoxy(vc, vc->vc_x, vc->vc_y);
1294         save_cur(vc);
1295
1296         if (tty) {
1297                 /* Rewrite the requested winsize data with the actual
1298                    resulting sizes */
1299                 struct winsize ws;
1300                 memset(&ws, 0, sizeof(ws));
1301                 ws.ws_row = vc->vc_rows;
1302                 ws.ws_col = vc->vc_cols;
1303                 ws.ws_ypixel = vc->vc_scan_lines;
1304                 tty_do_resize(tty, &ws);
1305         }
1306
1307         if (con_is_visible(vc))
1308                 update_screen(vc);
1309         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1310         notify_update(vc);
1311         return err;
1312 }
1313
1314 /**
1315  *      vc_resize               -       resize a VT
1316  *      @vc: virtual console
1317  *      @cols: columns
1318  *      @rows: rows
1319  *
1320  *      Resize a virtual console as seen from the console end of things. We
1321  *      use the common vc_do_resize methods to update the structures. The
1322  *      caller must hold the console sem to protect console internals and
1323  *      vc->port.tty
1324  */
1325
1326 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1327 {
1328         return vc_do_resize(vc->port.tty, vc, cols, rows);
1329 }
1330
1331 /**
1332  *      vt_resize               -       resize a VT
1333  *      @tty: tty to resize
1334  *      @ws: winsize attributes
1335  *
1336  *      Resize a virtual terminal. This is called by the tty layer as we
1337  *      register our own handler for resizing. The mutual helper does all
1338  *      the actual work.
1339  *
1340  *      Takes the console sem and the called methods then take the tty
1341  *      termios_rwsem and the tty ctrl_lock in that order.
1342  */
1343 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1344 {
1345         struct vc_data *vc = tty->driver_data;
1346         int ret;
1347
1348         console_lock();
1349         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1350         console_unlock();
1351         return ret;
1352 }
1353
1354 struct vc_data *vc_deallocate(unsigned int currcons)
1355 {
1356         struct vc_data *vc = NULL;
1357
1358         WARN_CONSOLE_UNLOCKED();
1359
1360         if (vc_cons_allocated(currcons)) {
1361                 struct vt_notifier_param param;
1362
1363                 param.vc = vc = vc_cons[currcons].d;
1364                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1365                 vcs_remove_sysfs(currcons);
1366                 visual_deinit(vc);
1367                 put_pid(vc->vt_pid);
1368                 vc_uniscr_set(vc, NULL);
1369                 kfree(vc->vc_screenbuf);
1370                 vc_cons[currcons].d = NULL;
1371         }
1372         return vc;
1373 }
1374
1375 /*
1376  *      VT102 emulator
1377  */
1378
1379 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1380
1381 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1382 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1383 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1384
1385 #define decarm          VC_REPEAT
1386 #define decckm          VC_CKMODE
1387 #define kbdapplic       VC_APPLIC
1388 #define lnm             VC_CRLF
1389
1390 /*
1391  * this is what the terminal answers to a ESC-Z or csi0c query.
1392  */
1393 #define VT100ID "\033[?1;2c"
1394 #define VT102ID "\033[?6c"
1395
1396 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1397                                        8,12,10,14, 9,13,11,15 };
1398
1399 /* the default colour table, for VGA+ colour systems */
1400 unsigned char default_red[] = {
1401         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1402         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1403 };
1404 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1405
1406 unsigned char default_grn[] = {
1407         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1408         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1409 };
1410 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1411
1412 unsigned char default_blu[] = {
1413         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1414         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1415 };
1416 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1417
1418 /*
1419  * gotoxy() must verify all boundaries, because the arguments
1420  * might also be negative. If the given position is out of
1421  * bounds, the cursor is placed at the nearest margin.
1422  */
1423 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1424 {
1425         int min_y, max_y;
1426
1427         if (new_x < 0)
1428                 vc->vc_x = 0;
1429         else {
1430                 if (new_x >= vc->vc_cols)
1431                         vc->vc_x = vc->vc_cols - 1;
1432                 else
1433                         vc->vc_x = new_x;
1434         }
1435
1436         if (vc->vc_decom) {
1437                 min_y = vc->vc_top;
1438                 max_y = vc->vc_bottom;
1439         } else {
1440                 min_y = 0;
1441                 max_y = vc->vc_rows;
1442         }
1443         if (new_y < min_y)
1444                 vc->vc_y = min_y;
1445         else if (new_y >= max_y)
1446                 vc->vc_y = max_y - 1;
1447         else
1448                 vc->vc_y = new_y;
1449         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1450         vc->vc_need_wrap = 0;
1451 }
1452
1453 /* for absolute user moves, when decom is set */
1454 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1455 {
1456         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1457 }
1458
1459 void scrollback(struct vc_data *vc)
1460 {
1461         scrolldelta(-(vc->vc_rows / 2));
1462 }
1463
1464 void scrollfront(struct vc_data *vc, int lines)
1465 {
1466         if (!lines)
1467                 lines = vc->vc_rows / 2;
1468         scrolldelta(lines);
1469 }
1470
1471 static void lf(struct vc_data *vc)
1472 {
1473         /* don't scroll if above bottom of scrolling region, or
1474          * if below scrolling region
1475          */
1476         if (vc->vc_y + 1 == vc->vc_bottom)
1477                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1478         else if (vc->vc_y < vc->vc_rows - 1) {
1479                 vc->vc_y++;
1480                 vc->vc_pos += vc->vc_size_row;
1481         }
1482         vc->vc_need_wrap = 0;
1483         notify_write(vc, '\n');
1484 }
1485
1486 static void ri(struct vc_data *vc)
1487 {
1488         /* don't scroll if below top of scrolling region, or
1489          * if above scrolling region
1490          */
1491         if (vc->vc_y == vc->vc_top)
1492                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1493         else if (vc->vc_y > 0) {
1494                 vc->vc_y--;
1495                 vc->vc_pos -= vc->vc_size_row;
1496         }
1497         vc->vc_need_wrap = 0;
1498 }
1499
1500 static inline void cr(struct vc_data *vc)
1501 {
1502         vc->vc_pos -= vc->vc_x << 1;
1503         vc->vc_need_wrap = vc->vc_x = 0;
1504         notify_write(vc, '\r');
1505 }
1506
1507 static inline void bs(struct vc_data *vc)
1508 {
1509         if (vc->vc_x) {
1510                 vc->vc_pos -= 2;
1511                 vc->vc_x--;
1512                 vc->vc_need_wrap = 0;
1513                 notify_write(vc, '\b');
1514         }
1515 }
1516
1517 static inline void del(struct vc_data *vc)
1518 {
1519         /* ignored */
1520 }
1521
1522 static void csi_J(struct vc_data *vc, int vpar)
1523 {
1524         unsigned int count;
1525         unsigned short * start;
1526
1527         switch (vpar) {
1528                 case 0: /* erase from cursor to end of display */
1529                         vc_uniscr_clear_line(vc, vc->vc_x,
1530                                              vc->vc_cols - vc->vc_x);
1531                         vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1532                                               vc->vc_rows - vc->vc_y - 1);
1533                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1534                         start = (unsigned short *)vc->vc_pos;
1535                         break;
1536                 case 1: /* erase from start to cursor */
1537                         vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1538                         vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1539                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1540                         start = (unsigned short *)vc->vc_origin;
1541                         break;
1542                 case 3: /* include scrollback */
1543                         flush_scrollback(vc);
1544                         /* fallthrough */
1545                 case 2: /* erase whole display */
1546                         vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1547                         count = vc->vc_cols * vc->vc_rows;
1548                         start = (unsigned short *)vc->vc_origin;
1549                         break;
1550                 default:
1551                         return;
1552         }
1553         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1554         if (con_should_update(vc))
1555                 do_update_region(vc, (unsigned long) start, count);
1556         vc->vc_need_wrap = 0;
1557 }
1558
1559 static void csi_K(struct vc_data *vc, int vpar)
1560 {
1561         unsigned int count;
1562         unsigned short *start = (unsigned short *)vc->vc_pos;
1563         int offset;
1564
1565         switch (vpar) {
1566                 case 0: /* erase from cursor to end of line */
1567                         offset = 0;
1568                         count = vc->vc_cols - vc->vc_x;
1569                         break;
1570                 case 1: /* erase from start of line to cursor */
1571                         offset = -vc->vc_x;
1572                         count = vc->vc_x + 1;
1573                         break;
1574                 case 2: /* erase whole line */
1575                         offset = -vc->vc_x;
1576                         count = vc->vc_cols;
1577                         break;
1578                 default:
1579                         return;
1580         }
1581         vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1582         scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1583         vc->vc_need_wrap = 0;
1584         if (con_should_update(vc))
1585                 do_update_region(vc, (unsigned long)(start + offset), count);
1586 }
1587
1588 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1589 {                                         /* not vt100? */
1590         int count;
1591
1592         if (!vpar)
1593                 vpar++;
1594         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1595
1596         vc_uniscr_clear_line(vc, vc->vc_x, count);
1597         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1598         if (con_should_update(vc))
1599                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1600         vc->vc_need_wrap = 0;
1601 }
1602
1603 static void default_attr(struct vc_data *vc)
1604 {
1605         vc->vc_intensity = 1;
1606         vc->vc_italic = 0;
1607         vc->vc_underline = 0;
1608         vc->vc_reverse = 0;
1609         vc->vc_blink = 0;
1610         vc->vc_color = vc->vc_def_color;
1611 }
1612
1613 struct rgb { u8 r; u8 g; u8 b; };
1614
1615 static void rgb_from_256(int i, struct rgb *c)
1616 {
1617         if (i < 8) {            /* Standard colours. */
1618                 c->r = i&1 ? 0xaa : 0x00;
1619                 c->g = i&2 ? 0xaa : 0x00;
1620                 c->b = i&4 ? 0xaa : 0x00;
1621         } else if (i < 16) {
1622                 c->r = i&1 ? 0xff : 0x55;
1623                 c->g = i&2 ? 0xff : 0x55;
1624                 c->b = i&4 ? 0xff : 0x55;
1625         } else if (i < 232) {   /* 6x6x6 colour cube. */
1626                 c->r = (i - 16) / 36 * 85 / 2;
1627                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1628                 c->b = (i - 16) % 6 * 85 / 2;
1629         } else                  /* Grayscale ramp. */
1630                 c->r = c->g = c->b = i * 10 - 2312;
1631 }
1632
1633 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1634 {
1635         u8 hue = 0, max = max3(c->r, c->g, c->b);
1636
1637         if (c->r > max / 2)
1638                 hue |= 4;
1639         if (c->g > max / 2)
1640                 hue |= 2;
1641         if (c->b > max / 2)
1642                 hue |= 1;
1643
1644         if (hue == 7 && max <= 0x55) {
1645                 hue = 0;
1646                 vc->vc_intensity = 2;
1647         } else if (max > 0xaa)
1648                 vc->vc_intensity = 2;
1649         else
1650                 vc->vc_intensity = 1;
1651
1652         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1653 }
1654
1655 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1656 {
1657         /* For backgrounds, err on the dark side. */
1658         vc->vc_color = (vc->vc_color & 0x0f)
1659                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1660 }
1661
1662 /*
1663  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1664  * and thus need to be detected and ignored by hand. That standard also
1665  * wants : rather than ; as separators but sequences containing : are currently
1666  * completely ignored by the parser.
1667  *
1668  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1669  * supporting them.
1670  */
1671 static int vc_t416_color(struct vc_data *vc, int i,
1672                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1673 {
1674         struct rgb c;
1675
1676         i++;
1677         if (i > vc->vc_npar)
1678                 return i;
1679
1680         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1681                 /* 256 colours */
1682                 i++;
1683                 rgb_from_256(vc->vc_par[i], &c);
1684         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1685                 /* 24 bit */
1686                 c.r = vc->vc_par[i + 1];
1687                 c.g = vc->vc_par[i + 2];
1688                 c.b = vc->vc_par[i + 3];
1689                 i += 3;
1690         } else
1691                 return i;
1692
1693         set_color(vc, &c);
1694
1695         return i;
1696 }
1697
1698 /* console_lock is held */
1699 static void csi_m(struct vc_data *vc)
1700 {
1701         int i;
1702
1703         for (i = 0; i <= vc->vc_npar; i++)
1704                 switch (vc->vc_par[i]) {
1705                 case 0: /* all attributes off */
1706                         default_attr(vc);
1707                         break;
1708                 case 1:
1709                         vc->vc_intensity = 2;
1710                         break;
1711                 case 2:
1712                         vc->vc_intensity = 0;
1713                         break;
1714                 case 3:
1715                         vc->vc_italic = 1;
1716                         break;
1717                 case 21:
1718                         /*
1719                          * No console drivers support double underline, so
1720                          * convert it to a single underline.
1721                          */
1722                 case 4:
1723                         vc->vc_underline = 1;
1724                         break;
1725                 case 5:
1726                         vc->vc_blink = 1;
1727                         break;
1728                 case 7:
1729                         vc->vc_reverse = 1;
1730                         break;
1731                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1732                           * Select primary font, don't display control chars if
1733                           * defined, don't set bit 8 on output.
1734                           */
1735                         vc->vc_translate = set_translate(vc->vc_charset == 0
1736                                         ? vc->vc_G0_charset
1737                                         : vc->vc_G1_charset, vc);
1738                         vc->vc_disp_ctrl = 0;
1739                         vc->vc_toggle_meta = 0;
1740                         break;
1741                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1742                           * Select first alternate font, lets chars < 32 be
1743                           * displayed as ROM chars.
1744                           */
1745                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1746                         vc->vc_disp_ctrl = 1;
1747                         vc->vc_toggle_meta = 0;
1748                         break;
1749                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1750                           * Select second alternate font, toggle high bit
1751                           * before displaying as ROM char.
1752                           */
1753                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1754                         vc->vc_disp_ctrl = 1;
1755                         vc->vc_toggle_meta = 1;
1756                         break;
1757                 case 22:
1758                         vc->vc_intensity = 1;
1759                         break;
1760                 case 23:
1761                         vc->vc_italic = 0;
1762                         break;
1763                 case 24:
1764                         vc->vc_underline = 0;
1765                         break;
1766                 case 25:
1767                         vc->vc_blink = 0;
1768                         break;
1769                 case 27:
1770                         vc->vc_reverse = 0;
1771                         break;
1772                 case 38:
1773                         i = vc_t416_color(vc, i, rgb_foreground);
1774                         break;
1775                 case 48:
1776                         i = vc_t416_color(vc, i, rgb_background);
1777                         break;
1778                 case 39:
1779                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1780                                 (vc->vc_color & 0xf0);
1781                         break;
1782                 case 49:
1783                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1784                                 (vc->vc_color & 0x0f);
1785                         break;
1786                 default:
1787                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1788                                 if (vc->vc_par[i] < 100)
1789                                         vc->vc_intensity = 2;
1790                                 vc->vc_par[i] -= 60;
1791                         }
1792                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1793                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1794                                         | (vc->vc_color & 0xf0);
1795                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1796                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1797                                         | (vc->vc_color & 0x0f);
1798                         break;
1799                 }
1800         update_attr(vc);
1801 }
1802
1803 static void respond_string(const char *p, struct tty_port *port)
1804 {
1805         while (*p) {
1806                 tty_insert_flip_char(port, *p, 0);
1807                 p++;
1808         }
1809         tty_schedule_flip(port);
1810 }
1811
1812 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1813 {
1814         char buf[40];
1815
1816         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1817         respond_string(buf, tty->port);
1818 }
1819
1820 static inline void status_report(struct tty_struct *tty)
1821 {
1822         respond_string("\033[0n", tty->port);   /* Terminal ok */
1823 }
1824
1825 static inline void respond_ID(struct tty_struct *tty)
1826 {
1827         respond_string(VT102ID, tty->port);
1828 }
1829
1830 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1831 {
1832         char buf[8];
1833
1834         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1835                 (char)('!' + mry));
1836         respond_string(buf, tty->port);
1837 }
1838
1839 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1840 int mouse_reporting(void)
1841 {
1842         return vc_cons[fg_console].d->vc_report_mouse;
1843 }
1844
1845 /* console_lock is held */
1846 static void set_mode(struct vc_data *vc, int on_off)
1847 {
1848         int i;
1849
1850         for (i = 0; i <= vc->vc_npar; i++)
1851                 if (vc->vc_priv == EPdec) {
1852                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1853                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1854                                 if (on_off)
1855                                         set_kbd(vc, decckm);
1856                                 else
1857                                         clr_kbd(vc, decckm);
1858                                 break;
1859                         case 3: /* 80/132 mode switch unimplemented */
1860 #if 0
1861                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1862                                 /* this alone does not suffice; some user mode
1863                                    utility has to change the hardware regs */
1864 #endif
1865                                 break;
1866                         case 5:                 /* Inverted screen on/off */
1867                                 if (vc->vc_decscnm != on_off) {
1868                                         vc->vc_decscnm = on_off;
1869                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1870                                         update_attr(vc);
1871                                 }
1872                                 break;
1873                         case 6:                 /* Origin relative/absolute */
1874                                 vc->vc_decom = on_off;
1875                                 gotoxay(vc, 0, 0);
1876                                 break;
1877                         case 7:                 /* Autowrap on/off */
1878                                 vc->vc_decawm = on_off;
1879                                 break;
1880                         case 8:                 /* Autorepeat on/off */
1881                                 if (on_off)
1882                                         set_kbd(vc, decarm);
1883                                 else
1884                                         clr_kbd(vc, decarm);
1885                                 break;
1886                         case 9:
1887                                 vc->vc_report_mouse = on_off ? 1 : 0;
1888                                 break;
1889                         case 25:                /* Cursor on/off */
1890                                 vc->vc_deccm = on_off;
1891                                 break;
1892                         case 1000:
1893                                 vc->vc_report_mouse = on_off ? 2 : 0;
1894                                 break;
1895                         }
1896                 } else {
1897                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1898                         case 3:                 /* Monitor (display ctrls) */
1899                                 vc->vc_disp_ctrl = on_off;
1900                                 break;
1901                         case 4:                 /* Insert Mode on/off */
1902                                 vc->vc_decim = on_off;
1903                                 break;
1904                         case 20:                /* Lf, Enter == CrLf/Lf */
1905                                 if (on_off)
1906                                         set_kbd(vc, lnm);
1907                                 else
1908                                         clr_kbd(vc, lnm);
1909                                 break;
1910                         }
1911                 }
1912 }
1913
1914 /* console_lock is held */
1915 static void setterm_command(struct vc_data *vc)
1916 {
1917         switch (vc->vc_par[0]) {
1918         case 1: /* set color for underline mode */
1919                 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1920                         vc->vc_ulcolor = color_table[vc->vc_par[1]];
1921                         if (vc->vc_underline)
1922                                 update_attr(vc);
1923                 }
1924                 break;
1925         case 2: /* set color for half intensity mode */
1926                 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1927                         vc->vc_halfcolor = color_table[vc->vc_par[1]];
1928                         if (vc->vc_intensity == 0)
1929                                 update_attr(vc);
1930                 }
1931                 break;
1932         case 8: /* store colors as defaults */
1933                 vc->vc_def_color = vc->vc_attr;
1934                 if (vc->vc_hi_font_mask == 0x100)
1935                         vc->vc_def_color >>= 1;
1936                 default_attr(vc);
1937                 update_attr(vc);
1938                 break;
1939         case 9: /* set blanking interval */
1940                 blankinterval = min(vc->vc_par[1], 60U) * 60;
1941                 poke_blanked_console();
1942                 break;
1943         case 10: /* set bell frequency in Hz */
1944                 if (vc->vc_npar >= 1)
1945                         vc->vc_bell_pitch = vc->vc_par[1];
1946                 else
1947                         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1948                 break;
1949         case 11: /* set bell duration in msec */
1950                 if (vc->vc_npar >= 1)
1951                         vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1952                                 msecs_to_jiffies(vc->vc_par[1]) : 0;
1953                 else
1954                         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1955                 break;
1956         case 12: /* bring specified console to the front */
1957                 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1958                         set_console(vc->vc_par[1] - 1);
1959                 break;
1960         case 13: /* unblank the screen */
1961                 poke_blanked_console();
1962                 break;
1963         case 14: /* set vesa powerdown interval */
1964                 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1965                 break;
1966         case 15: /* activate the previous console */
1967                 set_console(last_console);
1968                 break;
1969         case 16: /* set cursor blink duration in msec */
1970                 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1971                                 vc->vc_par[1] <= USHRT_MAX)
1972                         vc->vc_cur_blink_ms = vc->vc_par[1];
1973                 else
1974                         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1975                 break;
1976         }
1977 }
1978
1979 /* console_lock is held */
1980 static void csi_at(struct vc_data *vc, unsigned int nr)
1981 {
1982         if (nr > vc->vc_cols - vc->vc_x)
1983                 nr = vc->vc_cols - vc->vc_x;
1984         else if (!nr)
1985                 nr = 1;
1986         insert_char(vc, nr);
1987 }
1988
1989 /* console_lock is held */
1990 static void csi_L(struct vc_data *vc, unsigned int nr)
1991 {
1992         if (nr > vc->vc_rows - vc->vc_y)
1993                 nr = vc->vc_rows - vc->vc_y;
1994         else if (!nr)
1995                 nr = 1;
1996         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1997         vc->vc_need_wrap = 0;
1998 }
1999
2000 /* console_lock is held */
2001 static void csi_P(struct vc_data *vc, unsigned int nr)
2002 {
2003         if (nr > vc->vc_cols - vc->vc_x)
2004                 nr = vc->vc_cols - vc->vc_x;
2005         else if (!nr)
2006                 nr = 1;
2007         delete_char(vc, nr);
2008 }
2009
2010 /* console_lock is held */
2011 static void csi_M(struct vc_data *vc, unsigned int nr)
2012 {
2013         if (nr > vc->vc_rows - vc->vc_y)
2014                 nr = vc->vc_rows - vc->vc_y;
2015         else if (!nr)
2016                 nr=1;
2017         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
2018         vc->vc_need_wrap = 0;
2019 }
2020
2021 /* console_lock is held (except via vc_init->reset_terminal */
2022 static void save_cur(struct vc_data *vc)
2023 {
2024         vc->vc_saved_x          = vc->vc_x;
2025         vc->vc_saved_y          = vc->vc_y;
2026         vc->vc_s_intensity      = vc->vc_intensity;
2027         vc->vc_s_italic         = vc->vc_italic;
2028         vc->vc_s_underline      = vc->vc_underline;
2029         vc->vc_s_blink          = vc->vc_blink;
2030         vc->vc_s_reverse        = vc->vc_reverse;
2031         vc->vc_s_charset        = vc->vc_charset;
2032         vc->vc_s_color          = vc->vc_color;
2033         vc->vc_saved_G0         = vc->vc_G0_charset;
2034         vc->vc_saved_G1         = vc->vc_G1_charset;
2035 }
2036
2037 /* console_lock is held */
2038 static void restore_cur(struct vc_data *vc)
2039 {
2040         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2041         vc->vc_intensity        = vc->vc_s_intensity;
2042         vc->vc_italic           = vc->vc_s_italic;
2043         vc->vc_underline        = vc->vc_s_underline;
2044         vc->vc_blink            = vc->vc_s_blink;
2045         vc->vc_reverse          = vc->vc_s_reverse;
2046         vc->vc_charset          = vc->vc_s_charset;
2047         vc->vc_color            = vc->vc_s_color;
2048         vc->vc_G0_charset       = vc->vc_saved_G0;
2049         vc->vc_G1_charset       = vc->vc_saved_G1;
2050         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2051         update_attr(vc);
2052         vc->vc_need_wrap = 0;
2053 }
2054
2055 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2056         EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2057         ESpalette, ESosc };
2058
2059 /* console_lock is held (except via vc_init()) */
2060 static void reset_terminal(struct vc_data *vc, int do_clear)
2061 {
2062         vc->vc_top              = 0;
2063         vc->vc_bottom           = vc->vc_rows;
2064         vc->vc_state            = ESnormal;
2065         vc->vc_priv             = EPecma;
2066         vc->vc_translate        = set_translate(LAT1_MAP, vc);
2067         vc->vc_G0_charset       = LAT1_MAP;
2068         vc->vc_G1_charset       = GRAF_MAP;
2069         vc->vc_charset          = 0;
2070         vc->vc_need_wrap        = 0;
2071         vc->vc_report_mouse     = 0;
2072         vc->vc_utf              = default_utf8;
2073         vc->vc_utf_count        = 0;
2074
2075         vc->vc_disp_ctrl        = 0;
2076         vc->vc_toggle_meta      = 0;
2077
2078         vc->vc_decscnm          = 0;
2079         vc->vc_decom            = 0;
2080         vc->vc_decawm           = 1;
2081         vc->vc_deccm            = global_cursor_default;
2082         vc->vc_decim            = 0;
2083
2084         vt_reset_keyboard(vc->vc_num);
2085
2086         vc->vc_cursor_type = cur_default;
2087         vc->vc_complement_mask = vc->vc_s_complement_mask;
2088
2089         default_attr(vc);
2090         update_attr(vc);
2091
2092         vc->vc_tab_stop[0]      =
2093         vc->vc_tab_stop[1]      =
2094         vc->vc_tab_stop[2]      =
2095         vc->vc_tab_stop[3]      =
2096         vc->vc_tab_stop[4]      =
2097         vc->vc_tab_stop[5]      =
2098         vc->vc_tab_stop[6]      =
2099         vc->vc_tab_stop[7]      = 0x01010101;
2100
2101         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2102         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2103         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2104
2105         gotoxy(vc, 0, 0);
2106         save_cur(vc);
2107         if (do_clear)
2108             csi_J(vc, 2);
2109 }
2110
2111 /* console_lock is held */
2112 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2113 {
2114         /*
2115          *  Control characters can be used in the _middle_
2116          *  of an escape sequence.
2117          */
2118         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2119                 return;
2120         switch (c) {
2121         case 0:
2122                 return;
2123         case 7:
2124                 if (vc->vc_state == ESosc)
2125                         vc->vc_state = ESnormal;
2126                 else if (vc->vc_bell_duration)
2127                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2128                 return;
2129         case 8:
2130                 bs(vc);
2131                 return;
2132         case 9:
2133                 vc->vc_pos -= (vc->vc_x << 1);
2134                 while (vc->vc_x < vc->vc_cols - 1) {
2135                         vc->vc_x++;
2136                         if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
2137                                 break;
2138                 }
2139                 vc->vc_pos += (vc->vc_x << 1);
2140                 notify_write(vc, '\t');
2141                 return;
2142         case 10: case 11: case 12:
2143                 lf(vc);
2144                 if (!is_kbd(vc, lnm))
2145                         return;
2146                 /* fall through */
2147         case 13:
2148                 cr(vc);
2149                 return;
2150         case 14:
2151                 vc->vc_charset = 1;
2152                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2153                 vc->vc_disp_ctrl = 1;
2154                 return;
2155         case 15:
2156                 vc->vc_charset = 0;
2157                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2158                 vc->vc_disp_ctrl = 0;
2159                 return;
2160         case 24: case 26:
2161                 vc->vc_state = ESnormal;
2162                 return;
2163         case 27:
2164                 vc->vc_state = ESesc;
2165                 return;
2166         case 127:
2167                 del(vc);
2168                 return;
2169         case 128+27:
2170                 vc->vc_state = ESsquare;
2171                 return;
2172         }
2173         switch(vc->vc_state) {
2174         case ESesc:
2175                 vc->vc_state = ESnormal;
2176                 switch (c) {
2177                 case '[':
2178                         vc->vc_state = ESsquare;
2179                         return;
2180                 case ']':
2181                         vc->vc_state = ESnonstd;
2182                         return;
2183                 case '%':
2184                         vc->vc_state = ESpercent;
2185                         return;
2186                 case 'E':
2187                         cr(vc);
2188                         lf(vc);
2189                         return;
2190                 case 'M':
2191                         ri(vc);
2192                         return;
2193                 case 'D':
2194                         lf(vc);
2195                         return;
2196                 case 'H':
2197                         vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
2198                         return;
2199                 case 'Z':
2200                         respond_ID(tty);
2201                         return;
2202                 case '7':
2203                         save_cur(vc);
2204                         return;
2205                 case '8':
2206                         restore_cur(vc);
2207                         return;
2208                 case '(':
2209                         vc->vc_state = ESsetG0;
2210                         return;
2211                 case ')':
2212                         vc->vc_state = ESsetG1;
2213                         return;
2214                 case '#':
2215                         vc->vc_state = EShash;
2216                         return;
2217                 case 'c':
2218                         reset_terminal(vc, 1);
2219                         return;
2220                 case '>':  /* Numeric keypad */
2221                         clr_kbd(vc, kbdapplic);
2222                         return;
2223                 case '=':  /* Appl. keypad */
2224                         set_kbd(vc, kbdapplic);
2225                         return;
2226                 }
2227                 return;
2228         case ESnonstd:
2229                 if (c=='P') {   /* palette escape sequence */
2230                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2231                                 vc->vc_par[vc->vc_npar] = 0;
2232                         vc->vc_npar = 0;
2233                         vc->vc_state = ESpalette;
2234                         return;
2235                 } else if (c=='R') {   /* reset palette */
2236                         reset_palette(vc);
2237                         vc->vc_state = ESnormal;
2238                 } else if (c>='0' && c<='9')
2239                         vc->vc_state = ESosc;
2240                 else
2241                         vc->vc_state = ESnormal;
2242                 return;
2243         case ESpalette:
2244                 if (isxdigit(c)) {
2245                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2246                         if (vc->vc_npar == 7) {
2247                                 int i = vc->vc_par[0] * 3, j = 1;
2248                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2249                                 vc->vc_palette[i++] += vc->vc_par[j++];
2250                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2251                                 vc->vc_palette[i++] += vc->vc_par[j++];
2252                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2253                                 vc->vc_palette[i] += vc->vc_par[j];
2254                                 set_palette(vc);
2255                                 vc->vc_state = ESnormal;
2256                         }
2257                 } else
2258                         vc->vc_state = ESnormal;
2259                 return;
2260         case ESsquare:
2261                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2262                         vc->vc_par[vc->vc_npar] = 0;
2263                 vc->vc_npar = 0;
2264                 vc->vc_state = ESgetpars;
2265                 if (c == '[') { /* Function key */
2266                         vc->vc_state=ESfunckey;
2267                         return;
2268                 }
2269                 switch (c) {
2270                 case '?':
2271                         vc->vc_priv = EPdec;
2272                         return;
2273                 case '>':
2274                         vc->vc_priv = EPgt;
2275                         return;
2276                 case '=':
2277                         vc->vc_priv = EPeq;
2278                         return;
2279                 case '<':
2280                         vc->vc_priv = EPlt;
2281                         return;
2282                 }
2283                 vc->vc_priv = EPecma;
2284                 /* fall through */
2285         case ESgetpars:
2286                 if (c == ';' && vc->vc_npar < NPAR - 1) {
2287                         vc->vc_npar++;
2288                         return;
2289                 } else if (c>='0' && c<='9') {
2290                         vc->vc_par[vc->vc_npar] *= 10;
2291                         vc->vc_par[vc->vc_npar] += c - '0';
2292                         return;
2293                 }
2294                 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2295                         vc->vc_state = EScsiignore;
2296                         return;
2297                 }
2298                 vc->vc_state = ESnormal;
2299                 switch(c) {
2300                 case 'h':
2301                         if (vc->vc_priv <= EPdec)
2302                                 set_mode(vc, 1);
2303                         return;
2304                 case 'l':
2305                         if (vc->vc_priv <= EPdec)
2306                                 set_mode(vc, 0);
2307                         return;
2308                 case 'c':
2309                         if (vc->vc_priv == EPdec) {
2310                                 if (vc->vc_par[0])
2311                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2312                                 else
2313                                         vc->vc_cursor_type = cur_default;
2314                                 return;
2315                         }
2316                         break;
2317                 case 'm':
2318                         if (vc->vc_priv == EPdec) {
2319                                 clear_selection();
2320                                 if (vc->vc_par[0])
2321                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2322                                 else
2323                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
2324                                 return;
2325                         }
2326                         break;
2327                 case 'n':
2328                         if (vc->vc_priv == EPecma) {
2329                                 if (vc->vc_par[0] == 5)
2330                                         status_report(tty);
2331                                 else if (vc->vc_par[0] == 6)
2332                                         cursor_report(vc, tty);
2333                         }
2334                         return;
2335                 }
2336                 if (vc->vc_priv != EPecma) {
2337                         vc->vc_priv = EPecma;
2338                         return;
2339                 }
2340                 switch(c) {
2341                 case 'G': case '`':
2342                         if (vc->vc_par[0])
2343                                 vc->vc_par[0]--;
2344                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
2345                         return;
2346                 case 'A':
2347                         if (!vc->vc_par[0])
2348                                 vc->vc_par[0]++;
2349                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2350                         return;
2351                 case 'B': case 'e':
2352                         if (!vc->vc_par[0])
2353                                 vc->vc_par[0]++;
2354                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2355                         return;
2356                 case 'C': case 'a':
2357                         if (!vc->vc_par[0])
2358                                 vc->vc_par[0]++;
2359                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2360                         return;
2361                 case 'D':
2362                         if (!vc->vc_par[0])
2363                                 vc->vc_par[0]++;
2364                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2365                         return;
2366                 case 'E':
2367                         if (!vc->vc_par[0])
2368                                 vc->vc_par[0]++;
2369                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2370                         return;
2371                 case 'F':
2372                         if (!vc->vc_par[0])
2373                                 vc->vc_par[0]++;
2374                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2375                         return;
2376                 case 'd':
2377                         if (vc->vc_par[0])
2378                                 vc->vc_par[0]--;
2379                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2380                         return;
2381                 case 'H': case 'f':
2382                         if (vc->vc_par[0])
2383                                 vc->vc_par[0]--;
2384                         if (vc->vc_par[1])
2385                                 vc->vc_par[1]--;
2386                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2387                         return;
2388                 case 'J':
2389                         csi_J(vc, vc->vc_par[0]);
2390                         return;
2391                 case 'K':
2392                         csi_K(vc, vc->vc_par[0]);
2393                         return;
2394                 case 'L':
2395                         csi_L(vc, vc->vc_par[0]);
2396                         return;
2397                 case 'M':
2398                         csi_M(vc, vc->vc_par[0]);
2399                         return;
2400                 case 'P':
2401                         csi_P(vc, vc->vc_par[0]);
2402                         return;
2403                 case 'c':
2404                         if (!vc->vc_par[0])
2405                                 respond_ID(tty);
2406                         return;
2407                 case 'g':
2408                         if (!vc->vc_par[0])
2409                                 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2410                         else if (vc->vc_par[0] == 3) {
2411                                 vc->vc_tab_stop[0] =
2412                                         vc->vc_tab_stop[1] =
2413                                         vc->vc_tab_stop[2] =
2414                                         vc->vc_tab_stop[3] =
2415                                         vc->vc_tab_stop[4] =
2416                                         vc->vc_tab_stop[5] =
2417                                         vc->vc_tab_stop[6] =
2418                                         vc->vc_tab_stop[7] = 0;
2419                         }
2420                         return;
2421                 case 'm':
2422                         csi_m(vc);
2423                         return;
2424                 case 'q': /* DECLL - but only 3 leds */
2425                         /* map 0,1,2,3 to 0,1,2,4 */
2426                         if (vc->vc_par[0] < 4)
2427                                 vt_set_led_state(vc->vc_num,
2428                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2429                         return;
2430                 case 'r':
2431                         if (!vc->vc_par[0])
2432                                 vc->vc_par[0]++;
2433                         if (!vc->vc_par[1])
2434                                 vc->vc_par[1] = vc->vc_rows;
2435                         /* Minimum allowed region is 2 lines */
2436                         if (vc->vc_par[0] < vc->vc_par[1] &&
2437                             vc->vc_par[1] <= vc->vc_rows) {
2438                                 vc->vc_top = vc->vc_par[0] - 1;
2439                                 vc->vc_bottom = vc->vc_par[1];
2440                                 gotoxay(vc, 0, 0);
2441                         }
2442                         return;
2443                 case 's':
2444                         save_cur(vc);
2445                         return;
2446                 case 'u':
2447                         restore_cur(vc);
2448                         return;
2449                 case 'X':
2450                         csi_X(vc, vc->vc_par[0]);
2451                         return;
2452                 case '@':
2453                         csi_at(vc, vc->vc_par[0]);
2454                         return;
2455                 case ']': /* setterm functions */
2456                         setterm_command(vc);
2457                         return;
2458                 }
2459                 return;
2460         case EScsiignore:
2461                 if (c >= 20 && c <= 0x3f)
2462                         return;
2463                 vc->vc_state = ESnormal;
2464                 return;
2465         case ESpercent:
2466                 vc->vc_state = ESnormal;
2467                 switch (c) {
2468                 case '@':  /* defined in ISO 2022 */
2469                         vc->vc_utf = 0;
2470                         return;
2471                 case 'G':  /* prelim official escape code */
2472                 case '8':  /* retained for compatibility */
2473                         vc->vc_utf = 1;
2474                         return;
2475                 }
2476                 return;
2477         case ESfunckey:
2478                 vc->vc_state = ESnormal;
2479                 return;
2480         case EShash:
2481                 vc->vc_state = ESnormal;
2482                 if (c == '8') {
2483                         /* DEC screen alignment test. kludge :-) */
2484                         vc->vc_video_erase_char =
2485                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2486                         csi_J(vc, 2);
2487                         vc->vc_video_erase_char =
2488                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2489                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2490                 }
2491                 return;
2492         case ESsetG0:
2493                 if (c == '0')
2494                         vc->vc_G0_charset = GRAF_MAP;
2495                 else if (c == 'B')
2496                         vc->vc_G0_charset = LAT1_MAP;
2497                 else if (c == 'U')
2498                         vc->vc_G0_charset = IBMPC_MAP;
2499                 else if (c == 'K')
2500                         vc->vc_G0_charset = USER_MAP;
2501                 if (vc->vc_charset == 0)
2502                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2503                 vc->vc_state = ESnormal;
2504                 return;
2505         case ESsetG1:
2506                 if (c == '0')
2507                         vc->vc_G1_charset = GRAF_MAP;
2508                 else if (c == 'B')
2509                         vc->vc_G1_charset = LAT1_MAP;
2510                 else if (c == 'U')
2511                         vc->vc_G1_charset = IBMPC_MAP;
2512                 else if (c == 'K')
2513                         vc->vc_G1_charset = USER_MAP;
2514                 if (vc->vc_charset == 1)
2515                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2516                 vc->vc_state = ESnormal;
2517                 return;
2518         case ESosc:
2519                 return;
2520         default:
2521                 vc->vc_state = ESnormal;
2522         }
2523 }
2524
2525 /* is_double_width() is based on the wcwidth() implementation by
2526  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2527  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2528  */
2529 struct interval {
2530         uint32_t first;
2531         uint32_t last;
2532 };
2533
2534 static int ucs_cmp(const void *key, const void *elt)
2535 {
2536         uint32_t ucs = *(uint32_t *)key;
2537         struct interval e = *(struct interval *) elt;
2538
2539         if (ucs > e.last)
2540                 return 1;
2541         else if (ucs < e.first)
2542                 return -1;
2543         return 0;
2544 }
2545
2546 static int is_double_width(uint32_t ucs)
2547 {
2548         static const struct interval double_width[] = {
2549                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2550                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2551                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2552                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2553         };
2554         if (ucs < double_width[0].first ||
2555             ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2556                 return 0;
2557
2558         return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2559                         sizeof(struct interval), ucs_cmp) != NULL;
2560 }
2561
2562 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2563                 unsigned long draw_to, int *draw_x)
2564 {
2565         if (*draw_x < 0)
2566                 return;
2567
2568         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2569                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2570         *draw_x = -1;
2571 }
2572
2573 /* acquires console_lock */
2574 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2575 {
2576         int c, next_c, tc, ok, n = 0, draw_x = -1;
2577         unsigned int currcons;
2578         unsigned long draw_from = 0, draw_to = 0;
2579         struct vc_data *vc;
2580         unsigned char vc_attr;
2581         struct vt_notifier_param param;
2582         uint8_t rescan;
2583         uint8_t inverse;
2584         uint8_t width;
2585         u16 himask, charmask;
2586
2587         if (in_interrupt())
2588                 return count;
2589
2590         console_lock();
2591         vc = tty->driver_data;
2592         if (vc == NULL) {
2593                 pr_err("vt: argh, driver_data is NULL !\n");
2594                 console_unlock();
2595                 return 0;
2596         }
2597
2598         currcons = vc->vc_num;
2599         if (!vc_cons_allocated(currcons)) {
2600                 /* could this happen? */
2601                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2602                 console_unlock();
2603                 return 0;
2604         }
2605
2606         himask = vc->vc_hi_font_mask;
2607         charmask = himask ? 0x1ff : 0xff;
2608
2609         /* undraw cursor first */
2610         if (con_is_fg(vc))
2611                 hide_cursor(vc);
2612
2613         param.vc = vc;
2614
2615         while (!tty->stopped && count) {
2616                 int orig = *buf;
2617                 c = orig;
2618                 buf++;
2619                 n++;
2620                 count--;
2621                 rescan = 0;
2622                 inverse = 0;
2623                 width = 1;
2624
2625                 /* Do no translation at all in control states */
2626                 if (vc->vc_state != ESnormal) {
2627                         tc = c;
2628                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2629                     /* Combine UTF-8 into Unicode in vc_utf_char.
2630                      * vc_utf_count is the number of continuation bytes still
2631                      * expected to arrive.
2632                      * vc_npar is the number of continuation bytes arrived so
2633                      * far
2634                      */
2635 rescan_last_byte:
2636                     if ((c & 0xc0) == 0x80) {
2637                         /* Continuation byte received */
2638                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2639                         if (vc->vc_utf_count) {
2640                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2641                             vc->vc_npar++;
2642                             if (--vc->vc_utf_count) {
2643                                 /* Still need some bytes */
2644                                 continue;
2645                             }
2646                             /* Got a whole character */
2647                             c = vc->vc_utf_char;
2648                             /* Reject overlong sequences */
2649                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2650                                         c > utf8_length_changes[vc->vc_npar])
2651                                 c = 0xfffd;
2652                         } else {
2653                             /* Unexpected continuation byte */
2654                             vc->vc_utf_count = 0;
2655                             c = 0xfffd;
2656                         }
2657                     } else {
2658                         /* Single ASCII byte or first byte of a sequence received */
2659                         if (vc->vc_utf_count) {
2660                             /* Continuation byte expected */
2661                             rescan = 1;
2662                             vc->vc_utf_count = 0;
2663                             c = 0xfffd;
2664                         } else if (c > 0x7f) {
2665                             /* First byte of a multibyte sequence received */
2666                             vc->vc_npar = 0;
2667                             if ((c & 0xe0) == 0xc0) {
2668                                 vc->vc_utf_count = 1;
2669                                 vc->vc_utf_char = (c & 0x1f);
2670                             } else if ((c & 0xf0) == 0xe0) {
2671                                 vc->vc_utf_count = 2;
2672                                 vc->vc_utf_char = (c & 0x0f);
2673                             } else if ((c & 0xf8) == 0xf0) {
2674                                 vc->vc_utf_count = 3;
2675                                 vc->vc_utf_char = (c & 0x07);
2676                             } else if ((c & 0xfc) == 0xf8) {
2677                                 vc->vc_utf_count = 4;
2678                                 vc->vc_utf_char = (c & 0x03);
2679                             } else if ((c & 0xfe) == 0xfc) {
2680                                 vc->vc_utf_count = 5;
2681                                 vc->vc_utf_char = (c & 0x01);
2682                             } else {
2683                                 /* 254 and 255 are invalid */
2684                                 c = 0xfffd;
2685                             }
2686                             if (vc->vc_utf_count) {
2687                                 /* Still need some bytes */
2688                                 continue;
2689                             }
2690                         }
2691                         /* Nothing to do if an ASCII byte was received */
2692                     }
2693                     /* End of UTF-8 decoding. */
2694                     /* c is the received character, or U+FFFD for invalid sequences. */
2695                     /* Replace invalid Unicode code points with U+FFFD too */
2696                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2697                         c = 0xfffd;
2698                     tc = c;
2699                 } else {        /* no utf or alternate charset mode */
2700                     tc = vc_translate(vc, c);
2701                 }
2702
2703                 param.c = tc;
2704                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2705                                         &param) == NOTIFY_STOP)
2706                         continue;
2707
2708                 /* If the original code was a control character we
2709                  * only allow a glyph to be displayed if the code is
2710                  * not normally used (such as for cursor movement) or
2711                  * if the disp_ctrl mode has been explicitly enabled.
2712                  * Certain characters (as given by the CTRL_ALWAYS
2713                  * bitmap) are always displayed as control characters,
2714                  * as the console would be pretty useless without
2715                  * them; to display an arbitrary font position use the
2716                  * direct-to-font zone in UTF-8 mode.
2717                  */
2718                 ok = tc && (c >= 32 ||
2719                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2720                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2721                         && (c != 127 || vc->vc_disp_ctrl)
2722                         && (c != 128+27);
2723
2724                 if (vc->vc_state == ESnormal && ok) {
2725                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2726                                 if (is_double_width(c))
2727                                         width = 2;
2728                         }
2729                         /* Now try to find out how to display it */
2730                         tc = conv_uni_to_pc(vc, tc);
2731                         if (tc & ~charmask) {
2732                                 if (tc == -1 || tc == -2) {
2733                                     continue; /* nothing to display */
2734                                 }
2735                                 /* Glyph not found */
2736                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2737                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2738                                        This would make absolutely no sense with Unicode in mind,
2739                                        but do this for ASCII characters since a font may lack
2740                                        Unicode mapping info and we don't want to end up with
2741                                        having question marks only. */
2742                                     tc = c;
2743                                 } else {
2744                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2745                                     tc = conv_uni_to_pc(vc, 0xfffd);
2746                                     if (tc < 0) {
2747                                         inverse = 1;
2748                                         tc = conv_uni_to_pc(vc, '?');
2749                                         if (tc < 0) tc = '?';
2750                                     }
2751                                 }
2752                         }
2753
2754                         if (!inverse) {
2755                                 vc_attr = vc->vc_attr;
2756                         } else {
2757                                 /* invert vc_attr */
2758                                 if (!vc->vc_can_do_color) {
2759                                         vc_attr = (vc->vc_attr) ^ 0x08;
2760                                 } else if (vc->vc_hi_font_mask == 0x100) {
2761                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2762                                 } else {
2763                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2764                                 }
2765                                 con_flush(vc, draw_from, draw_to, &draw_x);
2766                         }
2767
2768                         next_c = c;
2769                         while (1) {
2770                                 if (vc->vc_need_wrap || vc->vc_decim)
2771                                         con_flush(vc, draw_from, draw_to,
2772                                                         &draw_x);
2773                                 if (vc->vc_need_wrap) {
2774                                         cr(vc);
2775                                         lf(vc);
2776                                 }
2777                                 if (vc->vc_decim)
2778                                         insert_char(vc, 1);
2779                                 vc_uniscr_putc(vc, next_c);
2780                                 scr_writew(himask ?
2781                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2782                                              (vc_attr << 8) + tc,
2783                                            (u16 *) vc->vc_pos);
2784                                 if (con_should_update(vc) && draw_x < 0) {
2785                                         draw_x = vc->vc_x;
2786                                         draw_from = vc->vc_pos;
2787                                 }
2788                                 if (vc->vc_x == vc->vc_cols - 1) {
2789                                         vc->vc_need_wrap = vc->vc_decawm;
2790                                         draw_to = vc->vc_pos + 2;
2791                                 } else {
2792                                         vc->vc_x++;
2793                                         draw_to = (vc->vc_pos += 2);
2794                                 }
2795
2796                                 if (!--width) break;
2797
2798                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2799                                 if (tc < 0) tc = ' ';
2800                                 next_c = ' ';
2801                         }
2802                         notify_write(vc, c);
2803
2804                         if (inverse)
2805                                 con_flush(vc, draw_from, draw_to, &draw_x);
2806
2807                         if (rescan) {
2808                                 rescan = 0;
2809                                 inverse = 0;
2810                                 width = 1;
2811                                 c = orig;
2812                                 goto rescan_last_byte;
2813                         }
2814                         continue;
2815                 }
2816                 con_flush(vc, draw_from, draw_to, &draw_x);
2817                 do_con_trol(tty, vc, orig);
2818         }
2819         con_flush(vc, draw_from, draw_to, &draw_x);
2820         vc_uniscr_debug_check(vc);
2821         console_conditional_schedule();
2822         notify_update(vc);
2823         console_unlock();
2824         return n;
2825 }
2826
2827 /*
2828  * This is the console switching callback.
2829  *
2830  * Doing console switching in a process context allows
2831  * us to do the switches asynchronously (needed when we want
2832  * to switch due to a keyboard interrupt).  Synchronization
2833  * with other console code and prevention of re-entrancy is
2834  * ensured with console_lock.
2835  */
2836 static void console_callback(struct work_struct *ignored)
2837 {
2838         console_lock();
2839
2840         if (want_console >= 0) {
2841                 if (want_console != fg_console &&
2842                     vc_cons_allocated(want_console)) {
2843                         hide_cursor(vc_cons[fg_console].d);
2844                         change_console(vc_cons[want_console].d);
2845                         /* we only changed when the console had already
2846                            been allocated - a new console is not created
2847                            in an interrupt routine */
2848                 }
2849                 want_console = -1;
2850         }
2851         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2852                 do_poke_blanked_console = 0;
2853                 poke_blanked_console();
2854         }
2855         if (scrollback_delta) {
2856                 struct vc_data *vc = vc_cons[fg_console].d;
2857                 clear_selection();
2858                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2859                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2860                 scrollback_delta = 0;
2861         }
2862         if (blank_timer_expired) {
2863                 do_blank_screen(0);
2864                 blank_timer_expired = 0;
2865         }
2866         notify_update(vc_cons[fg_console].d);
2867
2868         console_unlock();
2869 }
2870
2871 int set_console(int nr)
2872 {
2873         struct vc_data *vc = vc_cons[fg_console].d;
2874
2875         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2876                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2877
2878                 /*
2879                  * Console switch will fail in console_callback() or
2880                  * change_console() so there is no point scheduling
2881                  * the callback
2882                  *
2883                  * Existing set_console() users don't check the return
2884                  * value so this shouldn't break anything
2885                  */
2886                 return -EINVAL;
2887         }
2888
2889         want_console = nr;
2890         schedule_console_callback();
2891
2892         return 0;
2893 }
2894
2895 struct tty_driver *console_driver;
2896
2897 #ifdef CONFIG_VT_CONSOLE
2898
2899 /**
2900  * vt_kmsg_redirect() - Sets/gets the kernel message console
2901  * @new:        The new virtual terminal number or -1 if the console should stay
2902  *              unchanged
2903  *
2904  * By default, the kernel messages are always printed on the current virtual
2905  * console. However, the user may modify that default with the
2906  * TIOCL_SETKMSGREDIRECT ioctl call.
2907  *
2908  * This function sets the kernel message console to be @new. It returns the old
2909  * virtual console number. The virtual terminal number 0 (both as parameter and
2910  * return value) means no redirection (i.e. always printed on the currently
2911  * active console).
2912  *
2913  * The parameter -1 means that only the current console is returned, but the
2914  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2915  * case to make the code more understandable.
2916  *
2917  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2918  * the parameter and always returns 0.
2919  */
2920 int vt_kmsg_redirect(int new)
2921 {
2922         static int kmsg_con;
2923
2924         if (new != -1)
2925                 return xchg(&kmsg_con, new);
2926         else
2927                 return kmsg_con;
2928 }
2929
2930 /*
2931  *      Console on virtual terminal
2932  *
2933  * The console must be locked when we get here.
2934  */
2935
2936 static void vt_console_print(struct console *co, const char *b, unsigned count)
2937 {
2938         struct vc_data *vc = vc_cons[fg_console].d;
2939         unsigned char c;
2940         static DEFINE_SPINLOCK(printing_lock);
2941         const ushort *start;
2942         ushort start_x, cnt;
2943         int kmsg_console;
2944
2945         /* console busy or not yet initialized */
2946         if (!printable)
2947                 return;
2948         if (!spin_trylock(&printing_lock))
2949                 return;
2950
2951         kmsg_console = vt_get_kmsg_redirect();
2952         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2953                 vc = vc_cons[kmsg_console - 1].d;
2954
2955         if (!vc_cons_allocated(fg_console)) {
2956                 /* impossible */
2957                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2958                 goto quit;
2959         }
2960
2961         if (vc->vc_mode != KD_TEXT)
2962                 goto quit;
2963
2964         /* undraw cursor first */
2965         if (con_is_fg(vc))
2966                 hide_cursor(vc);
2967
2968         start = (ushort *)vc->vc_pos;
2969         start_x = vc->vc_x;
2970         cnt = 0;
2971         while (count--) {
2972                 c = *b++;
2973                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2974                         if (cnt && con_is_visible(vc))
2975                                 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2976                         cnt = 0;
2977                         if (c == 8) {           /* backspace */
2978                                 bs(vc);
2979                                 start = (ushort *)vc->vc_pos;
2980                                 start_x = vc->vc_x;
2981                                 continue;
2982                         }
2983                         if (c != 13)
2984                                 lf(vc);
2985                         cr(vc);
2986                         start = (ushort *)vc->vc_pos;
2987                         start_x = vc->vc_x;
2988                         if (c == 10 || c == 13)
2989                                 continue;
2990                 }
2991                 vc_uniscr_putc(vc, c);
2992                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2993                 notify_write(vc, c);
2994                 cnt++;
2995                 if (vc->vc_x == vc->vc_cols - 1) {
2996                         vc->vc_need_wrap = 1;
2997                 } else {
2998                         vc->vc_pos += 2;
2999                         vc->vc_x++;
3000                 }
3001         }
3002         if (cnt && con_is_visible(vc))
3003                 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
3004         set_cursor(vc);
3005         notify_update(vc);
3006
3007 quit:
3008         spin_unlock(&printing_lock);
3009 }
3010
3011 static struct tty_driver *vt_console_device(struct console *c, int *index)
3012 {
3013         *index = c->index ? c->index-1 : fg_console;
3014         return console_driver;
3015 }
3016
3017 static struct console vt_console_driver = {
3018         .name           = "tty",
3019         .write          = vt_console_print,
3020         .device         = vt_console_device,
3021         .unblank        = unblank_screen,
3022         .flags          = CON_PRINTBUFFER,
3023         .index          = -1,
3024 };
3025 #endif
3026
3027 /*
3028  *      Handling of Linux-specific VC ioctls
3029  */
3030
3031 /*
3032  * Generally a bit racy with respect to console_lock();.
3033  *
3034  * There are some functions which don't need it.
3035  *
3036  * There are some functions which can sleep for arbitrary periods
3037  * (paste_selection) but we don't need the lock there anyway.
3038  *
3039  * set_selection_user has locking, and definitely needs it
3040  */
3041
3042 int tioclinux(struct tty_struct *tty, unsigned long arg)
3043 {
3044         char type, data;
3045         char __user *p = (char __user *)arg;
3046         int lines;
3047         int ret;
3048
3049         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3050                 return -EPERM;
3051         if (get_user(type, p))
3052                 return -EFAULT;
3053         ret = 0;
3054
3055         switch (type)
3056         {
3057                 case TIOCL_SETSEL:
3058                         ret = set_selection_user((struct tiocl_selection
3059                                                  __user *)(p+1), tty);
3060                         break;
3061                 case TIOCL_PASTESEL:
3062                         ret = paste_selection(tty);
3063                         break;
3064                 case TIOCL_UNBLANKSCREEN:
3065                         console_lock();
3066                         unblank_screen();
3067                         console_unlock();
3068                         break;
3069                 case TIOCL_SELLOADLUT:
3070                         console_lock();
3071                         ret = sel_loadlut(p);
3072                         console_unlock();
3073                         break;
3074                 case TIOCL_GETSHIFTSTATE:
3075
3076         /*
3077          * Make it possible to react to Shift+Mousebutton.
3078          * Note that 'shift_state' is an undocumented
3079          * kernel-internal variable; programs not closely
3080          * related to the kernel should not use this.
3081          */
3082                         data = vt_get_shift_state();
3083                         ret = put_user(data, p);
3084                         break;
3085                 case TIOCL_GETMOUSEREPORTING:
3086                         console_lock(); /* May be overkill */
3087                         data = mouse_reporting();
3088                         console_unlock();
3089                         ret = put_user(data, p);
3090                         break;
3091                 case TIOCL_SETVESABLANK:
3092                         console_lock();
3093                         ret = set_vesa_blanking(p);
3094                         console_unlock();
3095                         break;
3096                 case TIOCL_GETKMSGREDIRECT:
3097                         data = vt_get_kmsg_redirect();
3098                         ret = put_user(data, p);
3099                         break;
3100                 case TIOCL_SETKMSGREDIRECT:
3101                         if (!capable(CAP_SYS_ADMIN)) {
3102                                 ret = -EPERM;
3103                         } else {
3104                                 if (get_user(data, p+1))
3105                                         ret = -EFAULT;
3106                                 else
3107                                         vt_kmsg_redirect(data);
3108                         }
3109                         break;
3110                 case TIOCL_GETFGCONSOLE:
3111                         /* No locking needed as this is a transiently
3112                            correct return anyway if the caller hasn't
3113                            disabled switching */
3114                         ret = fg_console;
3115                         break;
3116                 case TIOCL_SCROLLCONSOLE:
3117                         if (get_user(lines, (s32 __user *)(p+4))) {
3118                                 ret = -EFAULT;
3119                         } else {
3120                                 /* Need the console lock here. Note that lots
3121                                    of other calls need fixing before the lock
3122                                    is actually useful ! */
3123                                 console_lock();
3124                                 scrollfront(vc_cons[fg_console].d, lines);
3125                                 console_unlock();
3126                                 ret = 0;
3127                         }
3128                         break;
3129                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3130                         console_lock();
3131                         ignore_poke = 1;
3132                         do_blank_screen(0);
3133                         console_unlock();
3134                         break;
3135                 case TIOCL_BLANKEDSCREEN:
3136                         ret = console_blanked;
3137                         break;
3138                 default:
3139                         ret = -EINVAL;
3140                         break;
3141         }
3142         return ret;
3143 }
3144
3145 /*
3146  * /dev/ttyN handling
3147  */
3148
3149 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3150 {
3151         int     retval;
3152
3153         retval = do_con_write(tty, buf, count);
3154         con_flush_chars(tty);
3155
3156         return retval;
3157 }
3158
3159 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3160 {
3161         if (in_interrupt())
3162                 return 0;       /* n_r3964 calls put_char() from interrupt context */
3163         return do_con_write(tty, &ch, 1);
3164 }
3165
3166 static int con_write_room(struct tty_struct *tty)
3167 {
3168         if (tty->stopped)
3169                 return 0;
3170         return 32768;           /* No limit, really; we're not buffering */
3171 }
3172
3173 static int con_chars_in_buffer(struct tty_struct *tty)
3174 {
3175         return 0;               /* we're not buffering */
3176 }
3177
3178 /*
3179  * con_throttle and con_unthrottle are only used for
3180  * paste_selection(), which has to stuff in a large number of
3181  * characters...
3182  */
3183 static void con_throttle(struct tty_struct *tty)
3184 {
3185 }
3186
3187 static void con_unthrottle(struct tty_struct *tty)
3188 {
3189         struct vc_data *vc = tty->driver_data;
3190
3191         wake_up_interruptible(&vc->paste_wait);
3192 }
3193
3194 /*
3195  * Turn the Scroll-Lock LED on when the tty is stopped
3196  */
3197 static void con_stop(struct tty_struct *tty)
3198 {
3199         int console_num;
3200         if (!tty)
3201                 return;
3202         console_num = tty->index;
3203         if (!vc_cons_allocated(console_num))
3204                 return;
3205         vt_kbd_con_stop(console_num);
3206 }
3207
3208 /*
3209  * Turn the Scroll-Lock LED off when the console is started
3210  */
3211 static void con_start(struct tty_struct *tty)
3212 {
3213         int console_num;
3214         if (!tty)
3215                 return;
3216         console_num = tty->index;
3217         if (!vc_cons_allocated(console_num))
3218                 return;
3219         vt_kbd_con_start(console_num);
3220 }
3221
3222 static void con_flush_chars(struct tty_struct *tty)
3223 {
3224         struct vc_data *vc;
3225
3226         if (in_interrupt())     /* from flush_to_ldisc */
3227                 return;
3228
3229         /* if we race with con_close(), vt may be null */
3230         console_lock();
3231         vc = tty->driver_data;
3232         if (vc)
3233                 set_cursor(vc);
3234         console_unlock();
3235 }
3236
3237 /*
3238  * Allocate the console screen memory.
3239  */
3240 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3241 {
3242         unsigned int currcons = tty->index;
3243         struct vc_data *vc;
3244         int ret;
3245
3246         console_lock();
3247         ret = vc_allocate(currcons);
3248         if (ret)
3249                 goto unlock;
3250
3251         vc = vc_cons[currcons].d;
3252
3253         /* Still being freed */
3254         if (vc->port.tty) {
3255                 ret = -ERESTARTSYS;
3256                 goto unlock;
3257         }
3258
3259         ret = tty_port_install(&vc->port, driver, tty);
3260         if (ret)
3261                 goto unlock;
3262
3263         tty->driver_data = vc;
3264         vc->port.tty = tty;
3265         tty_port_get(&vc->port);
3266
3267         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3268                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3269                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3270         }
3271         if (vc->vc_utf)
3272                 tty->termios.c_iflag |= IUTF8;
3273         else
3274                 tty->termios.c_iflag &= ~IUTF8;
3275 unlock:
3276         console_unlock();
3277         return ret;
3278 }
3279
3280 static int con_open(struct tty_struct *tty, struct file *filp)
3281 {
3282         /* everything done in install */
3283         return 0;
3284 }
3285
3286
3287 static void con_close(struct tty_struct *tty, struct file *filp)
3288 {
3289         /* Nothing to do - we defer to shutdown */
3290 }
3291
3292 static void con_shutdown(struct tty_struct *tty)
3293 {
3294         struct vc_data *vc = tty->driver_data;
3295         BUG_ON(vc == NULL);
3296         console_lock();
3297         vc->port.tty = NULL;
3298         console_unlock();
3299 }
3300
3301 static void con_cleanup(struct tty_struct *tty)
3302 {
3303         struct vc_data *vc = tty->driver_data;
3304
3305         tty_port_put(&vc->port);
3306 }
3307
3308 static int default_color           = 7; /* white */
3309 static int default_italic_color    = 2; // green (ASCII)
3310 static int default_underline_color = 3; // cyan (ASCII)
3311 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3312 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3313 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3314
3315 static void vc_init(struct vc_data *vc, unsigned int rows,
3316                     unsigned int cols, int do_clear)
3317 {
3318         int j, k ;
3319
3320         vc->vc_cols = cols;
3321         vc->vc_rows = rows;
3322         vc->vc_size_row = cols << 1;
3323         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3324
3325         set_origin(vc);
3326         vc->vc_pos = vc->vc_origin;
3327         reset_vc(vc);
3328         for (j=k=0; j<16; j++) {
3329                 vc->vc_palette[k++] = default_red[j] ;
3330                 vc->vc_palette[k++] = default_grn[j] ;
3331                 vc->vc_palette[k++] = default_blu[j] ;
3332         }
3333         vc->vc_def_color       = default_color;
3334         vc->vc_ulcolor         = default_underline_color;
3335         vc->vc_itcolor         = default_italic_color;
3336         vc->vc_halfcolor       = 0x08;   /* grey */
3337         init_waitqueue_head(&vc->paste_wait);
3338         reset_terminal(vc, do_clear);
3339 }
3340
3341 /*
3342  * This routine initializes console interrupts, and does nothing
3343  * else. If you want the screen to clear, call tty_write with
3344  * the appropriate escape-sequence.
3345  */
3346
3347 static int __init con_init(void)
3348 {
3349         const char *display_desc = NULL;
3350         struct vc_data *vc;
3351         unsigned int currcons = 0, i;
3352
3353         console_lock();
3354
3355         if (!conswitchp)
3356                 conswitchp = &dummy_con;
3357         display_desc = conswitchp->con_startup();
3358         if (!display_desc) {
3359                 fg_console = 0;
3360                 console_unlock();
3361                 return 0;
3362         }
3363
3364         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3365                 struct con_driver *con_driver = &registered_con_driver[i];
3366
3367                 if (con_driver->con == NULL) {
3368                         con_driver->con = conswitchp;
3369                         con_driver->desc = display_desc;
3370                         con_driver->flag = CON_DRIVER_FLAG_INIT;
3371                         con_driver->first = 0;
3372                         con_driver->last = MAX_NR_CONSOLES - 1;
3373                         break;
3374                 }
3375         }
3376
3377         for (i = 0; i < MAX_NR_CONSOLES; i++)
3378                 con_driver_map[i] = conswitchp;
3379
3380         if (blankinterval) {
3381                 blank_state = blank_normal_wait;
3382                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3383         }
3384
3385         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3386                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3387                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3388                 tty_port_init(&vc->port);
3389                 visual_init(vc, currcons, 1);
3390                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3391                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3392                         currcons || !vc->vc_sw->con_save_screen);
3393         }
3394         currcons = fg_console = 0;
3395         master_display_fg = vc = vc_cons[currcons].d;
3396         set_origin(vc);
3397         save_screen(vc);
3398         gotoxy(vc, vc->vc_x, vc->vc_y);
3399         csi_J(vc, 0);
3400         update_screen(vc);
3401         pr_info("Console: %s %s %dx%d\n",
3402                 vc->vc_can_do_color ? "colour" : "mono",
3403                 display_desc, vc->vc_cols, vc->vc_rows);
3404         printable = 1;
3405
3406         console_unlock();
3407
3408 #ifdef CONFIG_VT_CONSOLE
3409         register_console(&vt_console_driver);
3410 #endif
3411         return 0;
3412 }
3413 console_initcall(con_init);
3414
3415 static const struct tty_operations con_ops = {
3416         .install = con_install,
3417         .open = con_open,
3418         .close = con_close,
3419         .write = con_write,
3420         .write_room = con_write_room,
3421         .put_char = con_put_char,
3422         .flush_chars = con_flush_chars,
3423         .chars_in_buffer = con_chars_in_buffer,
3424         .ioctl = vt_ioctl,
3425 #ifdef CONFIG_COMPAT
3426         .compat_ioctl = vt_compat_ioctl,
3427 #endif
3428         .stop = con_stop,
3429         .start = con_start,
3430         .throttle = con_throttle,
3431         .unthrottle = con_unthrottle,
3432         .resize = vt_resize,
3433         .shutdown = con_shutdown,
3434         .cleanup = con_cleanup,
3435 };
3436
3437 static struct cdev vc0_cdev;
3438
3439 static ssize_t show_tty_active(struct device *dev,
3440                                 struct device_attribute *attr, char *buf)
3441 {
3442         return sprintf(buf, "tty%d\n", fg_console + 1);
3443 }
3444 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3445
3446 static struct attribute *vt_dev_attrs[] = {
3447         &dev_attr_active.attr,
3448         NULL
3449 };
3450
3451 ATTRIBUTE_GROUPS(vt_dev);
3452
3453 int __init vty_init(const struct file_operations *console_fops)
3454 {
3455         cdev_init(&vc0_cdev, console_fops);
3456         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3457             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3458                 panic("Couldn't register /dev/tty0 driver\n");
3459         tty0dev = device_create_with_groups(tty_class, NULL,
3460                                             MKDEV(TTY_MAJOR, 0), NULL,
3461                                             vt_dev_groups, "tty0");
3462         if (IS_ERR(tty0dev))
3463                 tty0dev = NULL;
3464
3465         vcs_init();
3466
3467         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3468         if (!console_driver)
3469                 panic("Couldn't allocate console driver\n");
3470
3471         console_driver->name = "tty";
3472         console_driver->name_base = 1;
3473         console_driver->major = TTY_MAJOR;
3474         console_driver->minor_start = 1;
3475         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3476         console_driver->init_termios = tty_std_termios;
3477         if (default_utf8)
3478                 console_driver->init_termios.c_iflag |= IUTF8;
3479         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3480         tty_set_operations(console_driver, &con_ops);
3481         if (tty_register_driver(console_driver))
3482                 panic("Couldn't register console driver\n");
3483         kbd_init();
3484         console_map_init();
3485 #ifdef CONFIG_MDA_CONSOLE
3486         mda_console_init();
3487 #endif
3488         return 0;
3489 }
3490
3491 #ifndef VT_SINGLE_DRIVER
3492
3493 static struct class *vtconsole_class;
3494
3495 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3496                            int deflt)
3497 {
3498         struct module *owner = csw->owner;
3499         const char *desc = NULL;
3500         struct con_driver *con_driver;
3501         int i, j = -1, k = -1, retval = -ENODEV;
3502
3503         if (!try_module_get(owner))
3504                 return -ENODEV;
3505
3506         WARN_CONSOLE_UNLOCKED();
3507
3508         /* check if driver is registered */
3509         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3510                 con_driver = &registered_con_driver[i];
3511
3512                 if (con_driver->con == csw) {
3513                         desc = con_driver->desc;
3514                         retval = 0;
3515                         break;
3516                 }
3517         }
3518
3519         if (retval)
3520                 goto err;
3521
3522         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3523                 csw->con_startup();
3524                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3525         }
3526
3527         if (deflt) {
3528                 if (conswitchp)
3529                         module_put(conswitchp->owner);
3530
3531                 __module_get(owner);
3532                 conswitchp = csw;
3533         }
3534
3535         first = max(first, con_driver->first);
3536         last = min(last, con_driver->last);
3537
3538         for (i = first; i <= last; i++) {
3539                 int old_was_color;
3540                 struct vc_data *vc = vc_cons[i].d;
3541
3542                 if (con_driver_map[i])
3543                         module_put(con_driver_map[i]->owner);
3544                 __module_get(owner);
3545                 con_driver_map[i] = csw;
3546
3547                 if (!vc || !vc->vc_sw)
3548                         continue;
3549
3550                 j = i;
3551
3552                 if (con_is_visible(vc)) {
3553                         k = i;
3554                         save_screen(vc);
3555                 }
3556
3557                 old_was_color = vc->vc_can_do_color;
3558                 vc->vc_sw->con_deinit(vc);
3559                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3560                 visual_init(vc, i, 0);
3561                 set_origin(vc);
3562                 update_attr(vc);
3563
3564                 /* If the console changed between mono <-> color, then
3565                  * the attributes in the screenbuf will be wrong.  The
3566                  * following resets all attributes to something sane.
3567                  */
3568                 if (old_was_color != vc->vc_can_do_color)
3569                         clear_buffer_attributes(vc);
3570         }
3571
3572         pr_info("Console: switching ");
3573         if (!deflt)
3574                 pr_cont("consoles %d-%d ", first + 1, last + 1);
3575         if (j >= 0) {
3576                 struct vc_data *vc = vc_cons[j].d;
3577
3578                 pr_cont("to %s %s %dx%d\n",
3579                         vc->vc_can_do_color ? "colour" : "mono",
3580                         desc, vc->vc_cols, vc->vc_rows);
3581
3582                 if (k >= 0) {
3583                         vc = vc_cons[k].d;
3584                         update_screen(vc);
3585                 }
3586         } else {
3587                 pr_cont("to %s\n", desc);
3588         }
3589
3590         retval = 0;
3591 err:
3592         module_put(owner);
3593         return retval;
3594 };
3595
3596
3597 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3598 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3599 {
3600         struct module *owner = csw->owner;
3601         const struct consw *defcsw = NULL;
3602         struct con_driver *con_driver = NULL, *con_back = NULL;
3603         int i, retval = -ENODEV;
3604
3605         if (!try_module_get(owner))
3606                 return -ENODEV;
3607
3608         WARN_CONSOLE_UNLOCKED();
3609
3610         /* check if driver is registered and if it is unbindable */
3611         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3612                 con_driver = &registered_con_driver[i];
3613
3614                 if (con_driver->con == csw &&
3615                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3616                         retval = 0;
3617                         break;
3618                 }
3619         }
3620
3621         if (retval)
3622                 goto err;
3623
3624         retval = -ENODEV;
3625
3626         /* check if backup driver exists */
3627         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3628                 con_back = &registered_con_driver[i];
3629
3630                 if (con_back->con && con_back->con != csw) {
3631                         defcsw = con_back->con;
3632                         retval = 0;
3633                         break;
3634                 }
3635         }
3636
3637         if (retval)
3638                 goto err;
3639
3640         if (!con_is_bound(csw))
3641                 goto err;
3642
3643         first = max(first, con_driver->first);
3644         last = min(last, con_driver->last);
3645
3646         for (i = first; i <= last; i++) {
3647                 if (con_driver_map[i] == csw) {
3648                         module_put(csw->owner);
3649                         con_driver_map[i] = NULL;
3650                 }
3651         }
3652
3653         if (!con_is_bound(defcsw)) {
3654                 const struct consw *defconsw = conswitchp;
3655
3656                 defcsw->con_startup();
3657                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3658                 /*
3659                  * vgacon may change the default driver to point
3660                  * to dummycon, we restore it here...
3661                  */
3662                 conswitchp = defconsw;
3663         }
3664
3665         if (!con_is_bound(csw))
3666                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3667
3668         /* ignore return value, binding should not fail */
3669         do_bind_con_driver(defcsw, first, last, deflt);
3670 err:
3671         module_put(owner);
3672         return retval;
3673
3674 }
3675 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3676
3677 static int vt_bind(struct con_driver *con)
3678 {
3679         const struct consw *defcsw = NULL, *csw = NULL;
3680         int i, more = 1, first = -1, last = -1, deflt = 0;
3681
3682         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3683                 goto err;
3684
3685         csw = con->con;
3686
3687         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3688                 struct con_driver *con = &registered_con_driver[i];
3689
3690                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3691                         defcsw = con->con;
3692                         break;
3693                 }
3694         }
3695
3696         if (!defcsw)
3697                 goto err;
3698
3699         while (more) {
3700                 more = 0;
3701
3702                 for (i = con->first; i <= con->last; i++) {
3703                         if (con_driver_map[i] == defcsw) {
3704                                 if (first == -1)
3705                                         first = i;
3706                                 last = i;
3707                                 more = 1;
3708                         } else if (first != -1)
3709                                 break;
3710                 }
3711
3712                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3713                         deflt = 1;
3714
3715                 if (first != -1)
3716                         do_bind_con_driver(csw, first, last, deflt);
3717
3718                 first = -1;
3719                 last = -1;
3720                 deflt = 0;
3721         }
3722
3723 err:
3724         return 0;
3725 }
3726
3727 static int vt_unbind(struct con_driver *con)
3728 {
3729         const struct consw *csw = NULL;
3730         int i, more = 1, first = -1, last = -1, deflt = 0;
3731         int ret;
3732
3733         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3734                 goto err;
3735
3736         csw = con->con;
3737
3738         while (more) {
3739                 more = 0;
3740
3741                 for (i = con->first; i <= con->last; i++) {
3742                         if (con_driver_map[i] == csw) {
3743                                 if (first == -1)
3744                                         first = i;
3745                                 last = i;
3746                                 more = 1;
3747                         } else if (first != -1)
3748                                 break;
3749                 }
3750
3751                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3752                         deflt = 1;
3753
3754                 if (first != -1) {
3755                         ret = do_unbind_con_driver(csw, first, last, deflt);
3756                         if (ret != 0)
3757                                 return ret;
3758                 }
3759
3760                 first = -1;
3761                 last = -1;
3762                 deflt = 0;
3763         }
3764
3765 err:
3766         return 0;
3767 }
3768 #else
3769 static inline int vt_bind(struct con_driver *con)
3770 {
3771         return 0;
3772 }
3773 static inline int vt_unbind(struct con_driver *con)
3774 {
3775         return 0;
3776 }
3777 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3778
3779 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3780                           const char *buf, size_t count)
3781 {
3782         struct con_driver *con = dev_get_drvdata(dev);
3783         int bind = simple_strtoul(buf, NULL, 0);
3784
3785         console_lock();
3786
3787         if (bind)
3788                 vt_bind(con);
3789         else
3790                 vt_unbind(con);
3791
3792         console_unlock();
3793
3794         return count;
3795 }
3796
3797 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3798                          char *buf)
3799 {
3800         struct con_driver *con = dev_get_drvdata(dev);
3801         int bind;
3802
3803         console_lock();
3804         bind = con_is_bound(con->con);
3805         console_unlock();
3806
3807         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3808 }
3809
3810 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3811                          char *buf)
3812 {
3813         struct con_driver *con = dev_get_drvdata(dev);
3814
3815         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3816                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3817                          con->desc);
3818
3819 }
3820
3821 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3822 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3823
3824 static struct attribute *con_dev_attrs[] = {
3825         &dev_attr_bind.attr,
3826         &dev_attr_name.attr,
3827         NULL
3828 };
3829
3830 ATTRIBUTE_GROUPS(con_dev);
3831
3832 static int vtconsole_init_device(struct con_driver *con)
3833 {
3834         con->flag |= CON_DRIVER_FLAG_ATTR;
3835         return 0;
3836 }
3837
3838 static void vtconsole_deinit_device(struct con_driver *con)
3839 {
3840         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3841 }
3842
3843 /**
3844  * con_is_bound - checks if driver is bound to the console
3845  * @csw: console driver
3846  *
3847  * RETURNS: zero if unbound, nonzero if bound
3848  *
3849  * Drivers can call this and if zero, they should release
3850  * all resources allocated on con_startup()
3851  */
3852 int con_is_bound(const struct consw *csw)
3853 {
3854         int i, bound = 0;
3855
3856         WARN_CONSOLE_UNLOCKED();
3857
3858         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3859                 if (con_driver_map[i] == csw) {
3860                         bound = 1;
3861                         break;
3862                 }
3863         }
3864
3865         return bound;
3866 }
3867 EXPORT_SYMBOL(con_is_bound);
3868
3869 /**
3870  * con_is_visible - checks whether the current console is visible
3871  * @vc: virtual console
3872  *
3873  * RETURNS: zero if not visible, nonzero if visible
3874  */
3875 bool con_is_visible(const struct vc_data *vc)
3876 {
3877         WARN_CONSOLE_UNLOCKED();
3878
3879         return *vc->vc_display_fg == vc;
3880 }
3881 EXPORT_SYMBOL(con_is_visible);
3882
3883 /**
3884  * con_debug_enter - prepare the console for the kernel debugger
3885  * @sw: console driver
3886  *
3887  * Called when the console is taken over by the kernel debugger, this
3888  * function needs to save the current console state, then put the console
3889  * into a state suitable for the kernel debugger.
3890  *
3891  * RETURNS:
3892  * Zero on success, nonzero if a failure occurred when trying to prepare
3893  * the console for the debugger.
3894  */
3895 int con_debug_enter(struct vc_data *vc)
3896 {
3897         int ret = 0;
3898
3899         saved_fg_console = fg_console;
3900         saved_last_console = last_console;
3901         saved_want_console = want_console;
3902         saved_vc_mode = vc->vc_mode;
3903         saved_console_blanked = console_blanked;
3904         vc->vc_mode = KD_TEXT;
3905         console_blanked = 0;
3906         if (vc->vc_sw->con_debug_enter)
3907                 ret = vc->vc_sw->con_debug_enter(vc);
3908 #ifdef CONFIG_KGDB_KDB
3909         /* Set the initial LINES variable if it is not already set */
3910         if (vc->vc_rows < 999) {
3911                 int linecount;
3912                 char lns[4];
3913                 const char *setargs[3] = {
3914                         "set",
3915                         "LINES",
3916                         lns,
3917                 };
3918                 if (kdbgetintenv(setargs[0], &linecount)) {
3919                         snprintf(lns, 4, "%i", vc->vc_rows);
3920                         kdb_set(2, setargs);
3921                 }
3922         }
3923         if (vc->vc_cols < 999) {
3924                 int colcount;
3925                 char cols[4];
3926                 const char *setargs[3] = {
3927                         "set",
3928                         "COLUMNS",
3929                         cols,
3930                 };
3931                 if (kdbgetintenv(setargs[0], &colcount)) {
3932                         snprintf(cols, 4, "%i", vc->vc_cols);
3933                         kdb_set(2, setargs);
3934                 }
3935         }
3936 #endif /* CONFIG_KGDB_KDB */
3937         return ret;
3938 }
3939 EXPORT_SYMBOL_GPL(con_debug_enter);
3940
3941 /**
3942  * con_debug_leave - restore console state
3943  * @sw: console driver
3944  *
3945  * Restore the console state to what it was before the kernel debugger
3946  * was invoked.
3947  *
3948  * RETURNS:
3949  * Zero on success, nonzero if a failure occurred when trying to restore
3950  * the console.
3951  */
3952 int con_debug_leave(void)
3953 {
3954         struct vc_data *vc;
3955         int ret = 0;
3956
3957         fg_console = saved_fg_console;
3958         last_console = saved_last_console;
3959         want_console = saved_want_console;
3960         console_blanked = saved_console_blanked;
3961         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3962
3963         vc = vc_cons[fg_console].d;
3964         if (vc->vc_sw->con_debug_leave)
3965                 ret = vc->vc_sw->con_debug_leave(vc);
3966         return ret;
3967 }
3968 EXPORT_SYMBOL_GPL(con_debug_leave);
3969
3970 static int do_register_con_driver(const struct consw *csw, int first, int last)
3971 {
3972         struct module *owner = csw->owner;
3973         struct con_driver *con_driver;
3974         const char *desc;
3975         int i, retval;
3976
3977         WARN_CONSOLE_UNLOCKED();
3978
3979         if (!try_module_get(owner))
3980                 return -ENODEV;
3981
3982         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3983                 con_driver = &registered_con_driver[i];
3984
3985                 /* already registered */
3986                 if (con_driver->con == csw) {
3987                         retval = -EBUSY;
3988                         goto err;
3989                 }
3990         }
3991
3992         desc = csw->con_startup();
3993         if (!desc) {
3994                 retval = -ENODEV;
3995                 goto err;
3996         }
3997
3998         retval = -EINVAL;
3999
4000         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4001                 con_driver = &registered_con_driver[i];
4002
4003                 if (con_driver->con == NULL &&
4004                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4005                         con_driver->con = csw;
4006                         con_driver->desc = desc;
4007                         con_driver->node = i;
4008                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
4009                                            CON_DRIVER_FLAG_INIT;
4010                         con_driver->first = first;
4011                         con_driver->last = last;
4012                         retval = 0;
4013                         break;
4014                 }
4015         }
4016
4017         if (retval)
4018                 goto err;
4019
4020         con_driver->dev =
4021                 device_create_with_groups(vtconsole_class, NULL,
4022                                           MKDEV(0, con_driver->node),
4023                                           con_driver, con_dev_groups,
4024                                           "vtcon%i", con_driver->node);
4025         if (IS_ERR(con_driver->dev)) {
4026                 pr_warn("Unable to create device for %s; errno = %ld\n",
4027                         con_driver->desc, PTR_ERR(con_driver->dev));
4028                 con_driver->dev = NULL;
4029         } else {
4030                 vtconsole_init_device(con_driver);
4031         }
4032
4033 err:
4034         module_put(owner);
4035         return retval;
4036 }
4037
4038
4039 /**
4040  * do_unregister_con_driver - unregister console driver from console layer
4041  * @csw: console driver
4042  *
4043  * DESCRIPTION: All drivers that registers to the console layer must
4044  * call this function upon exit, or if the console driver is in a state
4045  * where it won't be able to handle console services, such as the
4046  * framebuffer console without loaded framebuffer drivers.
4047  *
4048  * The driver must unbind first prior to unregistration.
4049  */
4050 int do_unregister_con_driver(const struct consw *csw)
4051 {
4052         int i;
4053
4054         /* cannot unregister a bound driver */
4055         if (con_is_bound(csw))
4056                 return -EBUSY;
4057
4058         if (csw == conswitchp)
4059                 return -EINVAL;
4060
4061         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4062                 struct con_driver *con_driver = &registered_con_driver[i];
4063
4064                 if (con_driver->con == csw) {
4065                         /*
4066                          * Defer the removal of the sysfs entries since that
4067                          * will acquire the kernfs s_active lock and we can't
4068                          * acquire this lock while holding the console lock:
4069                          * the unbind sysfs entry imposes already the opposite
4070                          * order. Reset con already here to prevent any later
4071                          * lookup to succeed and mark this slot as zombie, so
4072                          * it won't get reused until we complete the removal
4073                          * in the deferred work.
4074                          */
4075                         con_driver->con = NULL;
4076                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4077                         schedule_work(&con_driver_unregister_work);
4078
4079                         return 0;
4080                 }
4081         }
4082
4083         return -ENODEV;
4084 }
4085 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4086
4087 static void con_driver_unregister_callback(struct work_struct *ignored)
4088 {
4089         int i;
4090
4091         console_lock();
4092
4093         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4094                 struct con_driver *con_driver = &registered_con_driver[i];
4095
4096                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4097                         continue;
4098
4099                 console_unlock();
4100
4101                 vtconsole_deinit_device(con_driver);
4102                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4103
4104                 console_lock();
4105
4106                 if (WARN_ON_ONCE(con_driver->con))
4107                         con_driver->con = NULL;
4108                 con_driver->desc = NULL;
4109                 con_driver->dev = NULL;
4110                 con_driver->node = 0;
4111                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4112                 con_driver->flag = 0;
4113                 con_driver->first = 0;
4114                 con_driver->last = 0;
4115         }
4116
4117         console_unlock();
4118 }
4119
4120 /*
4121  *      If we support more console drivers, this function is used
4122  *      when a driver wants to take over some existing consoles
4123  *      and become default driver for newly opened ones.
4124  *
4125  *      do_take_over_console is basically a register followed by bind
4126  */
4127 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4128 {
4129         int err;
4130
4131         err = do_register_con_driver(csw, first, last);
4132         /*
4133          * If we get an busy error we still want to bind the console driver
4134          * and return success, as we may have unbound the console driver
4135          * but not unregistered it.
4136          */
4137         if (err == -EBUSY)
4138                 err = 0;
4139         if (!err)
4140                 do_bind_con_driver(csw, first, last, deflt);
4141
4142         return err;
4143 }
4144 EXPORT_SYMBOL_GPL(do_take_over_console);
4145
4146
4147 /*
4148  * give_up_console is a wrapper to unregister_con_driver. It will only
4149  * work if driver is fully unbound.
4150  */
4151 void give_up_console(const struct consw *csw)
4152 {
4153         console_lock();
4154         do_unregister_con_driver(csw);
4155         console_unlock();
4156 }
4157
4158 static int __init vtconsole_class_init(void)
4159 {
4160         int i;
4161
4162         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4163         if (IS_ERR(vtconsole_class)) {
4164                 pr_warn("Unable to create vt console class; errno = %ld\n",
4165                         PTR_ERR(vtconsole_class));
4166                 vtconsole_class = NULL;
4167         }
4168
4169         /* Add system drivers to sysfs */
4170         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4171                 struct con_driver *con = &registered_con_driver[i];
4172
4173                 if (con->con && !con->dev) {
4174                         con->dev =
4175                                 device_create_with_groups(vtconsole_class, NULL,
4176                                                           MKDEV(0, con->node),
4177                                                           con, con_dev_groups,
4178                                                           "vtcon%i", con->node);
4179
4180                         if (IS_ERR(con->dev)) {
4181                                 pr_warn("Unable to create device for %s; errno = %ld\n",
4182                                         con->desc, PTR_ERR(con->dev));
4183                                 con->dev = NULL;
4184                         } else {
4185                                 vtconsole_init_device(con);
4186                         }
4187                 }
4188         }
4189
4190         return 0;
4191 }
4192 postcore_initcall(vtconsole_class_init);
4193
4194 #endif
4195
4196 /*
4197  *      Screen blanking
4198  */
4199
4200 static int set_vesa_blanking(char __user *p)
4201 {
4202         unsigned int mode;
4203
4204         if (get_user(mode, p + 1))
4205                 return -EFAULT;
4206
4207         vesa_blank_mode = (mode < 4) ? mode : 0;
4208         return 0;
4209 }
4210
4211 void do_blank_screen(int entering_gfx)
4212 {
4213         struct vc_data *vc = vc_cons[fg_console].d;
4214         int i;
4215
4216         might_sleep();
4217
4218         WARN_CONSOLE_UNLOCKED();
4219
4220         if (console_blanked) {
4221                 if (blank_state == blank_vesa_wait) {
4222                         blank_state = blank_off;
4223                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4224                 }
4225                 return;
4226         }
4227
4228         /* entering graphics mode? */
4229         if (entering_gfx) {
4230                 hide_cursor(vc);
4231                 save_screen(vc);
4232                 vc->vc_sw->con_blank(vc, -1, 1);
4233                 console_blanked = fg_console + 1;
4234                 blank_state = blank_off;
4235                 set_origin(vc);
4236                 return;
4237         }
4238
4239         blank_state = blank_off;
4240
4241         /* don't blank graphics */
4242         if (vc->vc_mode != KD_TEXT) {
4243                 console_blanked = fg_console + 1;
4244                 return;
4245         }
4246
4247         hide_cursor(vc);
4248         del_timer_sync(&console_timer);
4249         blank_timer_expired = 0;
4250
4251         save_screen(vc);
4252         /* In case we need to reset origin, blanking hook returns 1 */
4253         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4254         console_blanked = fg_console + 1;
4255         if (i)
4256                 set_origin(vc);
4257
4258         if (console_blank_hook && console_blank_hook(1))
4259                 return;
4260
4261         if (vesa_off_interval && vesa_blank_mode) {
4262                 blank_state = blank_vesa_wait;
4263                 mod_timer(&console_timer, jiffies + vesa_off_interval);
4264         }
4265         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4266 }
4267 EXPORT_SYMBOL(do_blank_screen);
4268
4269 /*
4270  * Called by timer as well as from vt_console_driver
4271  */
4272 void do_unblank_screen(int leaving_gfx)
4273 {
4274         struct vc_data *vc;
4275
4276         /* This should now always be called from a "sane" (read: can schedule)
4277          * context for the sake of the low level drivers, except in the special
4278          * case of oops_in_progress
4279          */
4280         if (!oops_in_progress)
4281                 might_sleep();
4282
4283         WARN_CONSOLE_UNLOCKED();
4284
4285         ignore_poke = 0;
4286         if (!console_blanked)
4287                 return;
4288         if (!vc_cons_allocated(fg_console)) {
4289                 /* impossible */
4290                 pr_warn("unblank_screen: tty %d not allocated ??\n",
4291                         fg_console + 1);
4292                 return;
4293         }
4294         vc = vc_cons[fg_console].d;
4295         if (vc->vc_mode != KD_TEXT)
4296                 return; /* but leave console_blanked != 0 */
4297
4298         if (blankinterval) {
4299                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4300                 blank_state = blank_normal_wait;
4301         }
4302
4303         console_blanked = 0;
4304         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4305                 /* Low-level driver cannot restore -> do it ourselves */
4306                 update_screen(vc);
4307         if (console_blank_hook)
4308                 console_blank_hook(0);
4309         set_palette(vc);
4310         set_cursor(vc);
4311         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4312 }
4313 EXPORT_SYMBOL(do_unblank_screen);
4314
4315 /*
4316  * This is called by the outside world to cause a forced unblank, mostly for
4317  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4318  * call it with 1 as an argument and so force a mode restore... that may kill
4319  * X or at least garbage the screen but would also make the Oops visible...
4320  */
4321 void unblank_screen(void)
4322 {
4323         do_unblank_screen(0);
4324 }
4325
4326 /*
4327  * We defer the timer blanking to work queue so it can take the console mutex
4328  * (console operations can still happen at irq time, but only from printk which
4329  * has the console mutex. Not perfect yet, but better than no locking
4330  */
4331 static void blank_screen_t(struct timer_list *unused)
4332 {
4333         blank_timer_expired = 1;
4334         schedule_work(&console_work);
4335 }
4336
4337 void poke_blanked_console(void)
4338 {
4339         WARN_CONSOLE_UNLOCKED();
4340
4341         /* Add this so we quickly catch whoever might call us in a non
4342          * safe context. Nowadays, unblank_screen() isn't to be called in
4343          * atomic contexts and is allowed to schedule (with the special case
4344          * of oops_in_progress, but that isn't of any concern for this
4345          * function. --BenH.
4346          */
4347         might_sleep();
4348
4349         /* This isn't perfectly race free, but a race here would be mostly harmless,
4350          * at worse, we'll do a spurrious blank and it's unlikely
4351          */
4352         del_timer(&console_timer);
4353         blank_timer_expired = 0;
4354
4355         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4356                 return;
4357         if (console_blanked)
4358                 unblank_screen();
4359         else if (blankinterval) {
4360                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4361                 blank_state = blank_normal_wait;
4362         }
4363 }
4364
4365 /*
4366  *      Palettes
4367  */
4368
4369 static void set_palette(struct vc_data *vc)
4370 {
4371         WARN_CONSOLE_UNLOCKED();
4372
4373         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4374                 vc->vc_sw->con_set_palette(vc, color_table);
4375 }
4376
4377 /*
4378  * Load palette into the DAC registers. arg points to a colour
4379  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4380  */
4381
4382 int con_set_cmap(unsigned char __user *arg)
4383 {
4384         int i, j, k;
4385         unsigned char colormap[3*16];
4386
4387         if (copy_from_user(colormap, arg, sizeof(colormap)))
4388                 return -EFAULT;
4389
4390         console_lock();
4391         for (i = k = 0; i < 16; i++) {
4392                 default_red[i] = colormap[k++];
4393                 default_grn[i] = colormap[k++];
4394                 default_blu[i] = colormap[k++];
4395         }
4396         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4397                 if (!vc_cons_allocated(i))
4398                         continue;
4399                 for (j = k = 0; j < 16; j++) {
4400                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4401                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4402                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4403                 }
4404                 set_palette(vc_cons[i].d);
4405         }
4406         console_unlock();
4407
4408         return 0;
4409 }
4410
4411 int con_get_cmap(unsigned char __user *arg)
4412 {
4413         int i, k;
4414         unsigned char colormap[3*16];
4415
4416         console_lock();
4417         for (i = k = 0; i < 16; i++) {
4418                 colormap[k++] = default_red[i];
4419                 colormap[k++] = default_grn[i];
4420                 colormap[k++] = default_blu[i];
4421         }
4422         console_unlock();
4423
4424         if (copy_to_user(arg, colormap, sizeof(colormap)))
4425                 return -EFAULT;
4426
4427         return 0;
4428 }
4429
4430 void reset_palette(struct vc_data *vc)
4431 {
4432         int j, k;
4433         for (j=k=0; j<16; j++) {
4434                 vc->vc_palette[k++] = default_red[j];
4435                 vc->vc_palette[k++] = default_grn[j];
4436                 vc->vc_palette[k++] = default_blu[j];
4437         }
4438         set_palette(vc);
4439 }
4440
4441 /*
4442  *  Font switching
4443  *
4444  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4445  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4446  *  depending on width) reserved for each character which is kinda wasty, but
4447  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
4448  *  is up to the actual low-level console-driver convert data into its favorite
4449  *  format (maybe we should add a `fontoffset' field to the `display'
4450  *  structure so we won't have to convert the fontdata all the time.
4451  *  /Jes
4452  */
4453
4454 #define max_font_size 65536
4455
4456 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4457 {
4458         struct console_font font;
4459         int rc = -EINVAL;
4460         int c;
4461
4462         if (op->data) {
4463                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4464                 if (!font.data)
4465                         return -ENOMEM;
4466         } else
4467                 font.data = NULL;
4468
4469         console_lock();
4470         if (vc->vc_mode != KD_TEXT)
4471                 rc = -EINVAL;
4472         else if (vc->vc_sw->con_font_get)
4473                 rc = vc->vc_sw->con_font_get(vc, &font);
4474         else
4475                 rc = -ENOSYS;
4476         console_unlock();
4477
4478         if (rc)
4479                 goto out;
4480
4481         c = (font.width+7)/8 * 32 * font.charcount;
4482
4483         if (op->data && font.charcount > op->charcount)
4484                 rc = -ENOSPC;
4485         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4486                 if (font.width > op->width || font.height > op->height)
4487                         rc = -ENOSPC;
4488         } else {
4489                 if (font.width != 8)
4490                         rc = -EIO;
4491                 else if ((op->height && font.height > op->height) ||
4492                          font.height > 32)
4493                         rc = -ENOSPC;
4494         }
4495         if (rc)
4496                 goto out;
4497
4498         op->height = font.height;
4499         op->width = font.width;
4500         op->charcount = font.charcount;
4501
4502         if (op->data && copy_to_user(op->data, font.data, c))
4503                 rc = -EFAULT;
4504
4505 out:
4506         kfree(font.data);
4507         return rc;
4508 }
4509
4510 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4511 {
4512         struct console_font font;
4513         int rc = -EINVAL;
4514         int size;
4515
4516         if (vc->vc_mode != KD_TEXT)
4517                 return -EINVAL;
4518         if (!op->data)
4519                 return -EINVAL;
4520         if (op->charcount > 512)
4521                 return -EINVAL;
4522         if (op->width <= 0 || op->width > 32 || op->height > 32)
4523                 return -EINVAL;
4524         size = (op->width+7)/8 * 32 * op->charcount;
4525         if (size > max_font_size)
4526                 return -ENOSPC;
4527
4528         font.data = memdup_user(op->data, size);
4529         if (IS_ERR(font.data))
4530                 return PTR_ERR(font.data);
4531
4532         if (!op->height) {              /* Need to guess font height [compat] */
4533                 int h, i;
4534                 u8 *charmap = font.data;
4535
4536                 /*
4537                  * If from KDFONTOP ioctl, don't allow things which can be done
4538                  * in userland,so that we can get rid of this soon
4539                  */
4540                 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4541                         kfree(font.data);
4542                         return -EINVAL;
4543                 }
4544
4545                 for (h = 32; h > 0; h--)
4546                         for (i = 0; i < op->charcount; i++)
4547                                 if (charmap[32*i+h-1])
4548                                         goto nonzero;
4549
4550                 kfree(font.data);
4551                 return -EINVAL;
4552
4553         nonzero:
4554                 op->height = h;
4555         }
4556
4557         font.charcount = op->charcount;
4558         font.width = op->width;
4559         font.height = op->height;
4560
4561         console_lock();
4562         if (vc->vc_mode != KD_TEXT)
4563                 rc = -EINVAL;
4564         else if (vc->vc_sw->con_font_set)
4565                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4566         else
4567                 rc = -ENOSYS;
4568         console_unlock();
4569         kfree(font.data);
4570         return rc;
4571 }
4572
4573 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4574 {
4575         struct console_font font = {.width = op->width, .height = op->height};
4576         char name[MAX_FONT_NAME];
4577         char *s = name;
4578         int rc;
4579
4580
4581         if (!op->data)
4582                 s = NULL;
4583         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4584                 return -EFAULT;
4585         else
4586                 name[MAX_FONT_NAME - 1] = 0;
4587
4588         console_lock();
4589         if (vc->vc_mode != KD_TEXT) {
4590                 console_unlock();
4591                 return -EINVAL;
4592         }
4593         if (vc->vc_sw->con_font_default)
4594                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4595         else
4596                 rc = -ENOSYS;
4597         console_unlock();
4598         if (!rc) {
4599                 op->width = font.width;
4600                 op->height = font.height;
4601         }
4602         return rc;
4603 }
4604
4605 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4606 {
4607         int con = op->height;
4608         int rc;
4609
4610
4611         console_lock();
4612         if (vc->vc_mode != KD_TEXT)
4613                 rc = -EINVAL;
4614         else if (!vc->vc_sw->con_font_copy)
4615                 rc = -ENOSYS;
4616         else if (con < 0 || !vc_cons_allocated(con))
4617                 rc = -ENOTTY;
4618         else if (con == vc->vc_num)     /* nothing to do */
4619                 rc = 0;
4620         else
4621                 rc = vc->vc_sw->con_font_copy(vc, con);
4622         console_unlock();
4623         return rc;
4624 }
4625
4626 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4627 {
4628         switch (op->op) {
4629         case KD_FONT_OP_SET:
4630                 return con_font_set(vc, op);
4631         case KD_FONT_OP_GET:
4632                 return con_font_get(vc, op);
4633         case KD_FONT_OP_SET_DEFAULT:
4634                 return con_font_default(vc, op);
4635         case KD_FONT_OP_COPY:
4636                 return con_font_copy(vc, op);
4637         }
4638         return -ENOSYS;
4639 }
4640
4641 /*
4642  *      Interface exported to selection and vcs.
4643  */
4644
4645 /* used by selection */
4646 u16 screen_glyph(struct vc_data *vc, int offset)
4647 {
4648         u16 w = scr_readw(screenpos(vc, offset, 1));
4649         u16 c = w & 0xff;
4650
4651         if (w & vc->vc_hi_font_mask)
4652                 c |= 0x100;
4653         return c;
4654 }
4655 EXPORT_SYMBOL_GPL(screen_glyph);
4656
4657 u32 screen_glyph_unicode(struct vc_data *vc, int n)
4658 {
4659         struct uni_screen *uniscr = get_vc_uniscr(vc);
4660
4661         if (uniscr)
4662                 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4663         return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4664 }
4665 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4666
4667 /* used by vcs - note the word offset */
4668 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4669 {
4670         return screenpos(vc, 2 * w_offset, viewed);
4671 }
4672 EXPORT_SYMBOL_GPL(screen_pos);
4673
4674 void getconsxy(struct vc_data *vc, unsigned char *p)
4675 {
4676         /* clamp values if they don't fit */
4677         p[0] = min(vc->vc_x, 0xFFu);
4678         p[1] = min(vc->vc_y, 0xFFu);
4679 }
4680
4681 void putconsxy(struct vc_data *vc, unsigned char *p)
4682 {
4683         hide_cursor(vc);
4684         gotoxy(vc, p[0], p[1]);
4685         set_cursor(vc);
4686 }
4687
4688 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4689 {
4690         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4691                 return softcursor_original;
4692         return scr_readw(org);
4693 }
4694
4695 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4696 {
4697         scr_writew(val, org);
4698         if ((unsigned long)org == vc->vc_pos) {
4699                 softcursor_original = -1;
4700                 add_softcursor(vc);
4701         }
4702 }
4703
4704 void vcs_scr_updated(struct vc_data *vc)
4705 {
4706         notify_update(vc);
4707 }
4708
4709 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4710                 unsigned int rolled_over, void *base, unsigned int size)
4711 {
4712         unsigned long ubase = (unsigned long)base;
4713         ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4714         ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4715         ptrdiff_t origin = (void *)c->vc_origin - base;
4716         int margin = c->vc_size_row * 4;
4717         int from, wrap, from_off, avail;
4718
4719         /* Turn scrollback off */
4720         if (!lines) {
4721                 c->vc_visible_origin = c->vc_origin;
4722                 return;
4723         }
4724
4725         /* Do we have already enough to allow jumping from 0 to the end? */
4726         if (rolled_over > scr_end + margin) {
4727                 from = scr_end;
4728                 wrap = rolled_over + c->vc_size_row;
4729         } else {
4730                 from = 0;
4731                 wrap = size;
4732         }
4733
4734         from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4735         avail = (origin - from + wrap) % wrap;
4736
4737         /* Only a little piece would be left? Show all incl. the piece! */
4738         if (avail < 2 * margin)
4739                 margin = 0;
4740         if (from_off < margin)
4741                 from_off = 0;
4742         if (from_off > avail - margin)
4743                 from_off = avail;
4744
4745         c->vc_visible_origin = ubase + (from + from_off) % wrap;
4746 }
4747 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4748
4749 /*
4750  *      Visible symbols for modules
4751  */
4752
4753 EXPORT_SYMBOL(color_table);
4754 EXPORT_SYMBOL(default_red);
4755 EXPORT_SYMBOL(default_grn);
4756 EXPORT_SYMBOL(default_blu);
4757 EXPORT_SYMBOL(update_region);
4758 EXPORT_SYMBOL(redraw_screen);
4759 EXPORT_SYMBOL(vc_resize);
4760 EXPORT_SYMBOL(fg_console);
4761 EXPORT_SYMBOL(console_blank_hook);
4762 EXPORT_SYMBOL(console_blanked);
4763 EXPORT_SYMBOL(vc_cons);
4764 EXPORT_SYMBOL(global_cursor_default);
4765 #ifndef VT_SINGLE_DRIVER
4766 EXPORT_SYMBOL(give_up_console);
4767 #endif