drivers/video/fbdev/core/fbcon.c

   1 /*
   2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1995 Geert Uytterhoeven
   5  *
   6  *
   7  *  This file is based on the original Amiga console driver (amicon.c):
   8  *
   9  *      Copyright (C) 1993 Hamish Macdonald
  10  *                         Greg Harp
  11  *      Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
  12  *
  13  *            with work by William Rucklidge (wjr@cs.cornell.edu)
  14  *                         Geert Uytterhoeven
  15  *                         Jes Sorensen (jds@kom.auc.dk)
  16  *                         Martin Apel
  17  *
  18  *  and on the original Atari console driver (atacon.c):
  19  *
  20  *      Copyright (C) 1993 Bjoern Brauel
  21  *                         Roman Hodek
  22  *
  23  *            with work by Guenther Kelleter
  24  *                         Martin Schaller
  25  *                         Andreas Schwab
  26  *
  27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
  28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
  29  *  and software scrollback added by
  30  *                         Jakub Jelinek (jj@ultra.linux.cz)
  31  *
  32  *  Random hacking by Martin Mares <mj@ucw.cz>
  33  *
  34  *      2001 - Documented with DocBook
  35  *      - Brad Douglas <brad@neruo.com>
  36  *
  37  *  The low level operations for the various display memory organizations are
  38  *  now in separate source files.
  39  *
  40  *  Currently the following organizations are supported:
  41  *
  42  *    o afb                     Amiga bitplanes
  43  *    o cfb{2,4,8,16,24,32}     Packed pixels
  44  *    o ilbm                    Amiga interleaved bitplanes
  45  *    o iplan2p[248]            Atari interleaved bitplanes
  46  *    o mfb                     Monochrome
  47  *    o vga                     VGA characters/attributes
  48  *
  49  *  To do:
  50  *
  51  *    - Implement 16 plane mode (iplan2p16)
  52  *
  53  *
  54  *  This file is subject to the terms and conditions of the GNU General Public
  55  *  License.  See the file COPYING in the main directory of this archive for
  56  *  more details.
  57  */
  58
  59 #include <linux/module.h>
  60 #include <linux/types.h>
  61 #include <linux/fs.h>
  62 #include <linux/kernel.h>
  63 #include <linux/delay.h>        /* MSch: for IRQ probe */
  64 #include <linux/console.h>
  65 #include <linux/string.h>
  66 #include <linux/kd.h>
  67 #include <linux/slab.h>
  68 #include <linux/fb.h>
  69 #include <linux/fbcon.h>
  70 #include <linux/vt_kern.h>
  71 #include <linux/selection.h>
  72 #include <linux/font.h>
  73 #include <linux/smp.h>
  74 #include <linux/init.h>
  75 #include <linux/interrupt.h>
  76 #include <linux/crc32.h> /* For counting font checksums */
  77 #include <linux/uaccess.h>
  78 #include <asm/fb.h>
  79 #include <asm/irq.h>
  80
  81 #include "fbcon.h"
  82
  83 /*
  84  * FIXME: Locking
  85  *
  86  * - fbcon state itself is protected by the console_lock, and the code does a
  87  *   pretty good job at making sure that lock is held everywhere it's needed.
  88  *
  89  * - fbcon doesn't bother with fb_lock/unlock at all. This is buggy, since it
  90  *   means concurrent access to the same fbdev from both fbcon and userspace
  91  *   will blow up. To fix this all fbcon calls from fbmem.c need to be moved out
  92  *   of fb_lock/unlock protected sections, since otherwise we'll recurse and
  93  *   deadlock eventually. Aside: Due to these deadlock issues the fbdev code in
  94  *   fbmem.c cannot use locking asserts, and there's lots of callers which get
  95  *   the rules wrong, e.g. fbsysfs.c entirely missed fb_lock/unlock calls too.
  96  */
  97
  98 enum {
  99         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
 100         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
 101         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
 102 };
 103
 104 static struct fbcon_display fb_display[MAX_NR_CONSOLES];
 105
 106 struct fb_info *fbcon_registered_fb[FB_MAX];
 107 int fbcon_num_registered_fb;
 108
 109 #define fbcon_for_each_registered_fb(i)         \
 110         for (i = 0; WARN_CONSOLE_UNLOCKED(), i < FB_MAX; i++)           \
 111                 if (!fbcon_registered_fb[i]) {} else
 112
 113 static signed char con2fb_map[MAX_NR_CONSOLES];
 114 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
 115
 116 static struct fb_info *fbcon_info_from_console(int console)
 117 {
 118         WARN_CONSOLE_UNLOCKED();
 119
 120         return fbcon_registered_fb[con2fb_map[console]];
 121 }
 122
 123 static int logo_lines;
 124 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 125    enums.  */
 126 static int logo_shown = FBCON_LOGO_CANSHOW;
 127 /* console mappings */
 128 static unsigned int first_fb_vc;
 129 static unsigned int last_fb_vc = MAX_NR_CONSOLES - 1;
 130 static int fbcon_is_default = 1;
 131 static int primary_device = -1;
 132 static int fbcon_has_console_bind;
 133
 134 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
 135 static int map_override;
 136
 137 static inline void fbcon_map_override(void)
 138 {
 139         map_override = 1;
 140 }
 141 #else
 142 static inline void fbcon_map_override(void)
 143 {
 144 }
 145 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */
 146
 147 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
 148 static bool deferred_takeover = true;
 149 #else
 150 #define deferred_takeover false
 151 #endif
 152
 153 /* font data */
 154 static char fontname[40];
 155
 156 /* current fb_info */
 157 static int info_idx = -1;
 158
 159 /* console rotation */
 160 static int initial_rotation = -1;
 161 static int fbcon_has_sysfs;
 162 static int margin_color;
 163
 164 static const struct consw fb_con;
 165
 166 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 167
 168 static int fbcon_cursor_noblink;
 169
 170 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 171
 172 /*
 173  *  Interface used by the world
 174  */
 175
 176 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 177 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table);
 178
 179 /*
 180  *  Internal routines
 181  */
 182 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 183                            int unit);
 184 static void fbcon_redraw_move(struct vc_data *vc, struct fbcon_display *p,
 185                               int line, int count, int dy);
 186 static void fbcon_modechanged(struct fb_info *info);
 187 static void fbcon_set_all_vcs(struct fb_info *info);
 188
 189 static struct device *fbcon_device;
 190
 191 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 192 static inline void fbcon_set_rotation(struct fb_info *info)
 193 {
 194         struct fbcon_ops *ops = info->fbcon_par;
 195
 196         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
 197             ops->p->con_rotate < 4)
 198                 ops->rotate = ops->p->con_rotate;
 199         else
 200                 ops->rotate = 0;
 201 }
 202
 203 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 204 {
 205         struct fbcon_ops *ops= info->fbcon_par;
 206         struct fb_info *fb_info;
 207
 208         if (!ops || ops->currcon == -1)
 209                 return;
 210
 211         fb_info = fbcon_info_from_console(ops->currcon);
 212
 213         if (info == fb_info) {
 214                 struct fbcon_display *p = &fb_display[ops->currcon];
 215
 216                 if (rotate < 4)
 217                         p->con_rotate = rotate;
 218                 else
 219                         p->con_rotate = 0;
 220
 221                 fbcon_modechanged(info);
 222         }
 223 }
 224
 225 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 226 {
 227         struct fbcon_ops *ops = info->fbcon_par;
 228         struct vc_data *vc;
 229         struct fbcon_display *p;
 230         int i;
 231
 232         if (!ops || ops->currcon < 0 || rotate > 3)
 233                 return;
 234
 235         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 236                 vc = vc_cons[i].d;
 237                 if (!vc || vc->vc_mode != KD_TEXT ||
 238                     fbcon_info_from_console(i) != info)
 239                         continue;
 240
 241                 p = &fb_display[vc->vc_num];
 242                 p->con_rotate = rotate;
 243         }
 244
 245         fbcon_set_all_vcs(info);
 246 }
 247 #else
 248 static inline void fbcon_set_rotation(struct fb_info *info)
 249 {
 250         struct fbcon_ops *ops = info->fbcon_par;
 251
 252         ops->rotate = FB_ROTATE_UR;
 253 }
 254
 255 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 256 {
 257         return;
 258 }
 259
 260 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 261 {
 262         return;
 263 }
 264 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 265
 266 static int fbcon_get_rotate(struct fb_info *info)
 267 {
 268         struct fbcon_ops *ops = info->fbcon_par;
 269
 270         return (ops) ? ops->rotate : 0;
 271 }
 272
 273 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 274 {
 275         struct fbcon_ops *ops = info->fbcon_par;
 276
 277         return (info->state != FBINFO_STATE_RUNNING ||
 278                 vc->vc_mode != KD_TEXT || ops->graphics);
 279 }
 280
 281 static int get_color(struct vc_data *vc, struct fb_info *info,
 282               u16 c, int is_fg)
 283 {
 284         int depth = fb_get_color_depth(&info->var, &info->fix);
 285         int color = 0;
 286
 287         if (console_blanked) {
 288                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 289
 290                 c = vc->vc_video_erase_char & charmask;
 291         }
 292
 293         if (depth != 1)
 294                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 295                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 296
 297         switch (depth) {
 298         case 1:
 299         {
 300                 int col = mono_col(info);
 301                 /* 0 or 1 */
 302                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 303                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 304
 305                 if (console_blanked)
 306                         fg = bg;
 307
 308                 color = (is_fg) ? fg : bg;
 309                 break;
 310         }
 311         case 2:
 312                 /*
 313                  * Scale down 16-colors to 4 colors. Default 4-color palette
 314                  * is grayscale. However, simply dividing the values by 4
 315                  * will not work, as colors 1, 2 and 3 will be scaled-down
 316                  * to zero rendering them invisible.  So empirically convert
 317                  * colors to a sane 4-level grayscale.
 318                  */
 319                 switch (color) {
 320                 case 0:
 321                         color = 0; /* black */
 322                         break;
 323                 case 1 ... 6:
 324                         color = 2; /* white */
 325                         break;
 326                 case 7 ... 8:
 327                         color = 1; /* gray */
 328                         break;
 329                 default:
 330                         color = 3; /* intense white */
 331                         break;
 332                 }
 333                 break;
 334         case 3:
 335                 /*
 336                  * Last 8 entries of default 16-color palette is a more intense
 337                  * version of the first 8 (i.e., same chrominance, different
 338                  * luminance).
 339                  */
 340                 color &= 7;
 341                 break;
 342         }
 343
 344
 345         return color;
 346 }
 347
 348 static void fb_flashcursor(struct work_struct *work)
 349 {
 350         struct fbcon_ops *ops = container_of(work, struct fbcon_ops, cursor_work.work);
 351         struct fb_info *info;
 352         struct vc_data *vc = NULL;
 353         int c;
 354         int mode;
 355         int ret;
 356
 357         /* FIXME: we should sort out the unbind locking instead */
 358         /* instead we just fail to flash the cursor if we can't get
 359          * the lock instead of blocking fbcon deinit */
 360         ret = console_trylock();
 361         if (ret == 0)
 362                 return;
 363
 364         /* protected by console_lock */
 365         info = ops->info;
 366
 367         if (ops->currcon != -1)
 368                 vc = vc_cons[ops->currcon].d;
 369
 370         if (!vc || !con_is_visible(vc) ||
 371             fbcon_info_from_console(vc->vc_num) != info ||
 372             vc->vc_deccm != 1) {
 373                 console_unlock();
 374                 return;
 375         }
 376
 377         c = scr_readw((u16 *) vc->vc_pos);
 378         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 379                 CM_ERASE : CM_DRAW;
 380         ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
 381                     get_color(vc, info, c, 0));
 382         console_unlock();
 383
 384         queue_delayed_work(system_power_efficient_wq, &ops->cursor_work,
 385                            ops->cur_blink_jiffies);
 386 }
 387
 388 static void fbcon_add_cursor_work(struct fb_info *info)
 389 {
 390         struct fbcon_ops *ops = info->fbcon_par;
 391
 392         if (!fbcon_cursor_noblink)
 393                 queue_delayed_work(system_power_efficient_wq, &ops->cursor_work,
 394                                    ops->cur_blink_jiffies);
 395 }
 396
 397 static void fbcon_del_cursor_work(struct fb_info *info)
 398 {
 399         struct fbcon_ops *ops = info->fbcon_par;
 400
 401         cancel_delayed_work_sync(&ops->cursor_work);
 402 }
 403
 404 #ifndef MODULE
 405 static int __init fb_console_setup(char *this_opt)
 406 {
 407         char *options;
 408         int i, j;
 409
 410         if (!this_opt || !*this_opt)
 411                 return 1;
 412
 413         while ((options = strsep(&this_opt, ",")) != NULL) {
 414                 if (!strncmp(options, "font:", 5)) {
 415                         strscpy(fontname, options + 5, sizeof(fontname));
 416                         continue;
 417                 }
 418
 419                 if (!strncmp(options, "scrollback:", 11)) {
 420                         pr_warn("Ignoring scrollback size option\n");
 421                         continue;
 422                 }
 423
 424                 if (!strncmp(options, "map:", 4)) {
 425                         options += 4;
 426                         if (*options) {
 427                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 428                                         if (!options[j])
 429                                                 j = 0;
 430                                         con2fb_map_boot[i] =
 431                                                 (options[j++]-'0') % FB_MAX;
 432                                 }
 433
 434                                 fbcon_map_override();
 435                         }
 436                         continue;
 437                 }
 438
 439                 if (!strncmp(options, "vc:", 3)) {
 440                         options += 3;
 441                         if (*options)
 442                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 443                         if (first_fb_vc >= MAX_NR_CONSOLES)
 444                                 first_fb_vc = 0;
 445                         if (*options++ == '-')
 446                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 447                         if (last_fb_vc < first_fb_vc || last_fb_vc >= MAX_NR_CONSOLES)
 448                                 last_fb_vc = MAX_NR_CONSOLES - 1;
 449                         fbcon_is_default = 0;
 450                         continue;
 451                 }
 452
 453                 if (!strncmp(options, "rotate:", 7)) {
 454                         options += 7;
 455                         if (*options)
 456                                 initial_rotation = simple_strtoul(options, &options, 0);
 457                         if (initial_rotation > 3)
 458                                 initial_rotation = 0;
 459                         continue;
 460                 }
 461
 462                 if (!strncmp(options, "margin:", 7)) {
 463                         options += 7;
 464                         if (*options)
 465                                 margin_color = simple_strtoul(options, &options, 0);
 466                         continue;
 467                 }
 468 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
 469                 if (!strcmp(options, "nodefer")) {
 470                         deferred_takeover = false;
 471                         continue;
 472                 }
 473 #endif
 474
 475                 if (!strncmp(options, "logo-pos:", 9)) {
 476                         options += 9;
 477                         if (!strcmp(options, "center"))
 478                                 fb_center_logo = true;
 479                         continue;
 480                 }
 481
 482                 if (!strncmp(options, "logo-count:", 11)) {
 483                         options += 11;
 484                         if (*options)
 485                                 fb_logo_count = simple_strtol(options, &options, 0);
 486                         continue;
 487                 }
 488         }
 489         return 1;
 490 }
 491
 492 __setup("fbcon=", fb_console_setup);
 493 #endif
 494
 495 static int search_fb_in_map(int idx)
 496 {
 497         int i, retval = 0;
 498
 499         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 500                 if (con2fb_map[i] == idx)
 501                         retval = 1;
 502         }
 503         return retval;
 504 }
 505
 506 static int search_for_mapped_con(void)
 507 {
 508         int i, retval = 0;
 509
 510         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 511                 if (con2fb_map[i] != -1)
 512                         retval = 1;
 513         }
 514         return retval;
 515 }
 516
 517 static int do_fbcon_takeover(int show_logo)
 518 {
 519         int err, i;
 520
 521         if (!fbcon_num_registered_fb)
 522                 return -ENODEV;
 523
 524         if (!show_logo)
 525                 logo_shown = FBCON_LOGO_DONTSHOW;
 526
 527         for (i = first_fb_vc; i <= last_fb_vc; i++)
 528                 con2fb_map[i] = info_idx;
 529
 530         err = do_take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 531                                 fbcon_is_default);
 532
 533         if (err) {
 534                 for (i = first_fb_vc; i <= last_fb_vc; i++)
 535                         con2fb_map[i] = -1;
 536                 info_idx = -1;
 537         } else {
 538                 fbcon_has_console_bind = 1;
 539         }
 540
 541         return err;
 542 }
 543
 544 #ifdef MODULE
 545 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 546                                int cols, int rows, int new_cols, int new_rows)
 547 {
 548         logo_shown = FBCON_LOGO_DONTSHOW;
 549 }
 550 #else
 551 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 552                                int cols, int rows, int new_cols, int new_rows)
 553 {
 554         /* Need to make room for the logo */
 555         struct fbcon_ops *ops = info->fbcon_par;
 556         int cnt, erase = vc->vc_video_erase_char, step;
 557         unsigned short *save = NULL, *r, *q;
 558         int logo_height;
 559
 560         if (info->fbops->owner) {
 561                 logo_shown = FBCON_LOGO_DONTSHOW;
 562                 return;
 563         }
 564
 565         /*
 566          * remove underline attribute from erase character
 567          * if black and white framebuffer.
 568          */
 569         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 570                 erase &= ~0x400;
 571         logo_height = fb_prepare_logo(info, ops->rotate);
 572         logo_lines = DIV_ROUND_UP(logo_height, vc->vc_font.height);
 573         q = (unsigned short *) (vc->vc_origin +
 574                                 vc->vc_size_row * rows);
 575         step = logo_lines * cols;
 576         for (r = q - logo_lines * cols; r < q; r++)
 577                 if (scr_readw(r) != vc->vc_video_erase_char)
 578                         break;
 579         if (r != q && new_rows >= rows + logo_lines) {
 580                 save = kzalloc(array3_size(logo_lines, new_cols, 2),
 581                                GFP_KERNEL);
 582                 if (save) {
 583                         int i = min(cols, new_cols);
 584                         scr_memsetw(save, erase, array3_size(logo_lines, new_cols, 2));
 585                         r = q - step;
 586                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 587                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 588                         r = q;
 589                 }
 590         }
 591         if (r == q) {
 592                 /* We can scroll screen down */
 593                 r = q - step - cols;
 594                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 595                         scr_memcpyw(r + step, r, vc->vc_size_row);
 596                         r -= cols;
 597                 }
 598                 if (!save) {
 599                         int lines;
 600                         if (vc->state.y + logo_lines >= rows)
 601                                 lines = rows - vc->state.y - 1;
 602                         else
 603                                 lines = logo_lines;
 604                         vc->state.y += lines;
 605                         vc->vc_pos += lines * vc->vc_size_row;
 606                 }
 607         }
 608         scr_memsetw((unsigned short *) vc->vc_origin,
 609                     erase,
 610                     vc->vc_size_row * logo_lines);
 611
 612         if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
 613                 fbcon_clear_margins(vc, 0);
 614                 update_screen(vc);
 615         }
 616
 617         if (save) {
 618                 q = (unsigned short *) (vc->vc_origin +
 619                                         vc->vc_size_row *
 620                                         rows);
 621                 scr_memcpyw(q, save, array3_size(logo_lines, new_cols, 2));
 622                 vc->state.y += logo_lines;
 623                 vc->vc_pos += logo_lines * vc->vc_size_row;
 624                 kfree(save);
 625         }
 626
 627         if (logo_shown == FBCON_LOGO_DONTSHOW)
 628                 return;
 629
 630         if (logo_lines > vc->vc_bottom) {
 631                 logo_shown = FBCON_LOGO_CANSHOW;
 632                 printk(KERN_INFO
 633                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
 634         } else {
 635                 logo_shown = FBCON_LOGO_DRAW;
 636                 vc->vc_top = logo_lines;
 637         }
 638 }
 639 #endif /* MODULE */
 640
 641 #ifdef CONFIG_FB_TILEBLITTING
 642 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 643 {
 644         struct fbcon_ops *ops = info->fbcon_par;
 645
 646         ops->p = &fb_display[vc->vc_num];
 647
 648         if ((info->flags & FBINFO_MISC_TILEBLITTING))
 649                 fbcon_set_tileops(vc, info);
 650         else {
 651                 fbcon_set_rotation(info);
 652                 fbcon_set_bitops(ops);
 653         }
 654 }
 655
 656 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 657 {
 658         int err = 0;
 659
 660         if (info->flags & FBINFO_MISC_TILEBLITTING &&
 661             info->tileops->fb_get_tilemax(info) < charcount)
 662                 err = 1;
 663
 664         return err;
 665 }
 666 #else
 667 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 668 {
 669         struct fbcon_ops *ops = info->fbcon_par;
 670
 671         info->flags &= ~FBINFO_MISC_TILEBLITTING;
 672         ops->p = &fb_display[vc->vc_num];
 673         fbcon_set_rotation(info);
 674         fbcon_set_bitops(ops);
 675 }
 676
 677 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 678 {
 679         return 0;
 680 }
 681
 682 #endif /* CONFIG_MISC_TILEBLITTING */
 683
 684 static void fbcon_release(struct fb_info *info)
 685 {
 686         lock_fb_info(info);
 687         if (info->fbops->fb_release)
 688                 info->fbops->fb_release(info, 0);
 689         unlock_fb_info(info);
 690
 691         module_put(info->fbops->owner);
 692
 693         if (info->fbcon_par) {
 694                 struct fbcon_ops *ops = info->fbcon_par;
 695
 696                 fbcon_del_cursor_work(info);
 697                 kfree(ops->cursor_state.mask);
 698                 kfree(ops->cursor_data);
 699                 kfree(ops->cursor_src);
 700                 kfree(ops->fontbuffer);
 701                 kfree(info->fbcon_par);
 702                 info->fbcon_par = NULL;
 703         }
 704 }
 705
 706 static int fbcon_open(struct fb_info *info)
 707 {
 708         struct fbcon_ops *ops;
 709
 710         if (!try_module_get(info->fbops->owner))
 711                 return -ENODEV;
 712
 713         lock_fb_info(info);
 714         if (info->fbops->fb_open &&
 715             info->fbops->fb_open(info, 0)) {
 716                 unlock_fb_info(info);
 717                 module_put(info->fbops->owner);
 718                 return -ENODEV;
 719         }
 720         unlock_fb_info(info);
 721
 722         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 723         if (!ops) {
 724                 fbcon_release(info);
 725                 return -ENOMEM;
 726         }
 727
 728         INIT_DELAYED_WORK(&ops->cursor_work, fb_flashcursor);
 729         ops->info = info;
 730         info->fbcon_par = ops;
 731         ops->cur_blink_jiffies = HZ / 5;
 732
 733         return 0;
 734 }
 735
 736 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
 737                                   int unit)
 738 {
 739         int err;
 740
 741         err = fbcon_open(info);
 742         if (err)
 743                 return err;
 744
 745         if (vc)
 746                 set_blitting_type(vc, info);
 747
 748         return err;
 749 }
 750
 751 static void con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 752                                    struct fb_info *newinfo)
 753 {
 754         int ret;
 755
 756         fbcon_release(oldinfo);
 757
 758         /*
 759           If oldinfo and newinfo are driving the same hardware,
 760           the fb_release() method of oldinfo may attempt to
 761           restore the hardware state.  This will leave the
 762           newinfo in an undefined state. Thus, a call to
 763           fb_set_par() may be needed for the newinfo.
 764         */
 765         if (newinfo && newinfo->fbops->fb_set_par) {
 766                 ret = newinfo->fbops->fb_set_par(newinfo);
 767
 768                 if (ret)
 769                         printk(KERN_ERR "con2fb_release_oldinfo: "
 770                                 "detected unhandled fb_set_par error, "
 771                                 "error code %d\n", ret);
 772         }
 773 }
 774
 775 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 776                                 int unit, int show_logo)
 777 {
 778         struct fbcon_ops *ops = info->fbcon_par;
 779         int ret;
 780
 781         ops->currcon = fg_console;
 782
 783         if (info->fbops->fb_set_par && !ops->initialized) {
 784                 ret = info->fbops->fb_set_par(info);
 785
 786                 if (ret)
 787                         printk(KERN_ERR "con2fb_init_display: detected "
 788                                 "unhandled fb_set_par error, "
 789                                 "error code %d\n", ret);
 790         }
 791
 792         ops->initialized = true;
 793         ops->graphics = 0;
 794         fbcon_set_disp(info, &info->var, unit);
 795
 796         if (show_logo) {
 797                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 798                 struct fb_info *fg_info =
 799                         fbcon_info_from_console(fg_console);
 800
 801                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 802                                    fg_vc->vc_rows, fg_vc->vc_cols,
 803                                    fg_vc->vc_rows);
 804         }
 805
 806         update_screen(vc_cons[fg_console].d);
 807 }
 808
 809 /**
 810  *      set_con2fb_map - map console to frame buffer device
 811  *      @unit: virtual console number to map
 812  *      @newidx: frame buffer index to map virtual console to
 813  *      @user: user request
 814  *
 815  *      Maps a virtual console @unit to a frame buffer device
 816  *      @newidx.
 817  *
 818  *      This should be called with the console lock held.
 819  */
 820 static int set_con2fb_map(int unit, int newidx, int user)
 821 {
 822         struct vc_data *vc = vc_cons[unit].d;
 823         int oldidx = con2fb_map[unit];
 824         struct fb_info *info = fbcon_registered_fb[newidx];
 825         struct fb_info *oldinfo = NULL;
 826         int found, err = 0, show_logo;
 827
 828         WARN_CONSOLE_UNLOCKED();
 829
 830         if (oldidx == newidx)
 831                 return 0;
 832
 833         if (!info)
 834                 return -EINVAL;
 835
 836         if (!search_for_mapped_con() || !con_is_bound(&fb_con)) {
 837                 info_idx = newidx;
 838                 return do_fbcon_takeover(0);
 839         }
 840
 841         if (oldidx != -1)
 842                 oldinfo = fbcon_registered_fb[oldidx];
 843
 844         found = search_fb_in_map(newidx);
 845
 846         if (!err && !found) {
 847                 err = con2fb_acquire_newinfo(vc, info, unit);
 848                 if (!err)
 849                         con2fb_map[unit] = newidx;
 850         }
 851
 852         /*
 853          * If old fb is not mapped to any of the consoles,
 854          * fbcon should release it.
 855          */
 856         if (!err && oldinfo && !search_fb_in_map(oldidx))
 857                 con2fb_release_oldinfo(vc, oldinfo, info);
 858
 859         show_logo = (fg_console == 0 && !user &&
 860                          logo_shown != FBCON_LOGO_DONTSHOW);
 861
 862         if (!found)
 863                 fbcon_add_cursor_work(info);
 864         con2fb_map_boot[unit] = newidx;
 865         con2fb_init_display(vc, info, unit, show_logo);
 866
 867         if (!search_fb_in_map(info_idx))
 868                 info_idx = newidx;
 869
 870         return err;
 871 }
 872
 873 /*
 874  *  Low Level Operations
 875  */
 876 /* NOTE: fbcon cannot be __init: it may be called from do_take_over_console later */
 877 static int var_to_display(struct fbcon_display *disp,
 878                           struct fb_var_screeninfo *var,
 879                           struct fb_info *info)
 880 {
 881         disp->xres_virtual = var->xres_virtual;
 882         disp->yres_virtual = var->yres_virtual;
 883         disp->bits_per_pixel = var->bits_per_pixel;
 884         disp->grayscale = var->grayscale;
 885         disp->nonstd = var->nonstd;
 886         disp->accel_flags = var->accel_flags;
 887         disp->height = var->height;
 888         disp->width = var->width;
 889         disp->red = var->red;
 890         disp->green = var->green;
 891         disp->blue = var->blue;
 892         disp->transp = var->transp;
 893         disp->rotate = var->rotate;
 894         disp->mode = fb_match_mode(var, &info->modelist);
 895         if (disp->mode == NULL)
 896                 /* This should not happen */
 897                 return -EINVAL;
 898         return 0;
 899 }
 900
 901 static void display_to_var(struct fb_var_screeninfo *var,
 902                            struct fbcon_display *disp)
 903 {
 904         fb_videomode_to_var(var, disp->mode);
 905         var->xres_virtual = disp->xres_virtual;
 906         var->yres_virtual = disp->yres_virtual;
 907         var->bits_per_pixel = disp->bits_per_pixel;
 908         var->grayscale = disp->grayscale;
 909         var->nonstd = disp->nonstd;
 910         var->accel_flags = disp->accel_flags;
 911         var->height = disp->height;
 912         var->width = disp->width;
 913         var->red = disp->red;
 914         var->green = disp->green;
 915         var->blue = disp->blue;
 916         var->transp = disp->transp;
 917         var->rotate = disp->rotate;
 918 }
 919
 920 static const char *fbcon_startup(void)
 921 {
 922         const char *display_desc = "frame buffer device";
 923         struct fbcon_display *p = &fb_display[fg_console];
 924         struct vc_data *vc = vc_cons[fg_console].d;
 925         const struct font_desc *font = NULL;
 926         struct fb_info *info = NULL;
 927         struct fbcon_ops *ops;
 928         int rows, cols;
 929
 930         /*
 931          *  If num_registered_fb is zero, this is a call for the dummy part.
 932          *  The frame buffer devices weren't initialized yet.
 933          */
 934         if (!fbcon_num_registered_fb || info_idx == -1)
 935                 return display_desc;
 936         /*
 937          * Instead of blindly using registered_fb[0], we use info_idx, set by
 938          * fbcon_fb_registered();
 939          */
 940         info = fbcon_registered_fb[info_idx];
 941         if (!info)
 942                 return NULL;
 943
 944         if (fbcon_open(info))
 945                 return NULL;
 946
 947         ops = info->fbcon_par;
 948         ops->currcon = -1;
 949         ops->graphics = 1;
 950         ops->cur_rotate = -1;
 951
 952         p->con_rotate = initial_rotation;
 953         if (p->con_rotate == -1)
 954                 p->con_rotate = info->fbcon_rotate_hint;
 955         if (p->con_rotate == -1)
 956                 p->con_rotate = FB_ROTATE_UR;
 957
 958         set_blitting_type(vc, info);
 959
 960         /* Setup default font */
 961         if (!p->fontdata) {
 962                 if (!fontname[0] || !(font = find_font(fontname)))
 963                         font = get_default_font(info->var.xres,
 964                                                 info->var.yres,
 965                                                 info->pixmap.blit_x,
 966                                                 info->pixmap.blit_y);
 967                 vc->vc_font.width = font->width;
 968                 vc->vc_font.height = font->height;
 969                 vc->vc_font.data = (void *)(p->fontdata = font->data);
 970                 vc->vc_font.charcount = font->charcount;
 971         }
 972
 973         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
 974         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
 975         cols /= vc->vc_font.width;
 976         rows /= vc->vc_font.height;
 977         vc_resize(vc, cols, rows);
 978
 979         pr_debug("mode:   %s\n", info->fix.id);
 980         pr_debug("visual: %d\n", info->fix.visual);
 981         pr_debug("res:    %dx%d-%d\n", info->var.xres,
 982                  info->var.yres,
 983                  info->var.bits_per_pixel);
 984
 985         fbcon_add_cursor_work(info);
 986         return display_desc;
 987 }
 988
 989 static void fbcon_init(struct vc_data *vc, int init)
 990 {
 991         struct fb_info *info;
 992         struct fbcon_ops *ops;
 993         struct vc_data **default_mode = vc->vc_display_fg;
 994         struct vc_data *svc = *default_mode;
 995         struct fbcon_display *t, *p = &fb_display[vc->vc_num];
 996         int logo = 1, new_rows, new_cols, rows, cols;
 997         int ret;
 998
 999         if (WARN_ON(info_idx == -1))
1000             return;
1001
1002         if (con2fb_map[vc->vc_num] == -1)
1003                 con2fb_map[vc->vc_num] = info_idx;
1004
1005         info = fbcon_info_from_console(vc->vc_num);
1006
1007         if (logo_shown < 0 && console_loglevel <= CONSOLE_LOGLEVEL_QUIET)
1008                 logo_shown = FBCON_LOGO_DONTSHOW;
1009
1010         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1011             (info->fix.type == FB_TYPE_TEXT))
1012                 logo = 0;
1013
1014         if (var_to_display(p, &info->var, info))
1015                 return;
1016
1017         if (!info->fbcon_par)
1018                 con2fb_acquire_newinfo(vc, info, vc->vc_num);
1019
1020         /* If we are not the first console on this
1021            fb, copy the font from that console */
1022         t = &fb_display[fg_console];
1023         if (!p->fontdata) {
1024                 if (t->fontdata) {
1025                         struct vc_data *fvc = vc_cons[fg_console].d;
1026
1027                         vc->vc_font.data = (void *)(p->fontdata =
1028                                                     fvc->vc_font.data);
1029                         vc->vc_font.width = fvc->vc_font.width;
1030                         vc->vc_font.height = fvc->vc_font.height;
1031                         vc->vc_font.charcount = fvc->vc_font.charcount;
1032                         p->userfont = t->userfont;
1033
1034                         if (p->userfont)
1035                                 REFCOUNT(p->fontdata)++;
1036                 } else {
1037                         const struct font_desc *font = NULL;
1038
1039                         if (!fontname[0] || !(font = find_font(fontname)))
1040                                 font = get_default_font(info->var.xres,
1041                                                         info->var.yres,
1042                                                         info->pixmap.blit_x,
1043                                                         info->pixmap.blit_y);
1044                         vc->vc_font.width = font->width;
1045                         vc->vc_font.height = font->height;
1046                         vc->vc_font.data = (void *)(p->fontdata = font->data);
1047                         vc->vc_font.charcount = font->charcount;
1048                 }
1049         }
1050
1051         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1052         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1053         if (vc->vc_font.charcount == 256) {
1054                 vc->vc_hi_font_mask = 0;
1055         } else {
1056                 vc->vc_hi_font_mask = 0x100;
1057                 if (vc->vc_can_do_color)
1058                         vc->vc_complement_mask <<= 1;
1059         }
1060
1061         if (!*svc->uni_pagedict_loc)
1062                 con_set_default_unimap(svc);
1063         if (!*vc->uni_pagedict_loc)
1064                 con_copy_unimap(vc, svc);
1065
1066         ops = info->fbcon_par;
1067         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1068
1069         p->con_rotate = initial_rotation;
1070         if (p->con_rotate == -1)
1071                 p->con_rotate = info->fbcon_rotate_hint;
1072         if (p->con_rotate == -1)
1073                 p->con_rotate = FB_ROTATE_UR;
1074
1075         set_blitting_type(vc, info);
1076
1077         cols = vc->vc_cols;
1078         rows = vc->vc_rows;
1079         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1080         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1081         new_cols /= vc->vc_font.width;
1082         new_rows /= vc->vc_font.height;
1083
1084         /*
1085          * We must always set the mode. The mode of the previous console
1086          * driver could be in the same resolution but we are using different
1087          * hardware so we have to initialize the hardware.
1088          *
1089          * We need to do it in fbcon_init() to prevent screen corruption.
1090          */
1091         if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
1092                 if (info->fbops->fb_set_par && !ops->initialized) {
1093                         ret = info->fbops->fb_set_par(info);
1094
1095                         if (ret)
1096                                 printk(KERN_ERR "fbcon_init: detected "
1097                                         "unhandled fb_set_par error, "
1098                                         "error code %d\n", ret);
1099                 }
1100
1101                 ops->initialized = true;
1102         }
1103
1104         ops->graphics = 0;
1105
1106 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
1107         if ((info->flags & FBINFO_HWACCEL_COPYAREA) &&
1108             !(info->flags & FBINFO_HWACCEL_DISABLED))
1109                 p->scrollmode = SCROLL_MOVE;
1110         else /* default to something safe */
1111                 p->scrollmode = SCROLL_REDRAW;
1112 #endif
1113
1114         /*
1115          *  ++guenther: console.c:vc_allocate() relies on initializing
1116          *  vc_{cols,rows}, but we must not set those if we are only
1117          *  resizing the console.
1118          */
1119         if (init) {
1120                 vc->vc_cols = new_cols;
1121                 vc->vc_rows = new_rows;
1122         } else
1123                 vc_resize(vc, new_cols, new_rows);
1124
1125         if (logo)
1126                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1127
1128         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1129                 ops->rotate = FB_ROTATE_UR;
1130                 set_blitting_type(vc, info);
1131         }
1132
1133         ops->p = &fb_display[fg_console];
1134 }
1135
1136 static void fbcon_free_font(struct fbcon_display *p)
1137 {
1138         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
1139                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
1140         p->fontdata = NULL;
1141         p->userfont = 0;
1142 }
1143
1144 static void set_vc_hi_font(struct vc_data *vc, bool set);
1145
1146 static void fbcon_release_all(void)
1147 {
1148         struct fb_info *info;
1149         int i, j, mapped;
1150
1151         fbcon_for_each_registered_fb(i) {
1152                 mapped = 0;
1153                 info = fbcon_registered_fb[i];
1154
1155                 for (j = first_fb_vc; j <= last_fb_vc; j++) {
1156                         if (con2fb_map[j] == i) {
1157                                 mapped = 1;
1158                                 con2fb_map[j] = -1;
1159                         }
1160                 }
1161
1162                 if (mapped)
1163                         fbcon_release(info);
1164         }
1165 }
1166
1167 static void fbcon_deinit(struct vc_data *vc)
1168 {
1169         struct fbcon_display *p = &fb_display[vc->vc_num];
1170         struct fb_info *info;
1171         struct fbcon_ops *ops;
1172         int idx;
1173
1174         fbcon_free_font(p);
1175         idx = con2fb_map[vc->vc_num];
1176
1177         if (idx == -1)
1178                 goto finished;
1179
1180         info = fbcon_registered_fb[idx];
1181
1182         if (!info)
1183                 goto finished;
1184
1185         ops = info->fbcon_par;
1186
1187         if (!ops)
1188                 goto finished;
1189
1190         if (con_is_visible(vc))
1191                 fbcon_del_cursor_work(info);
1192
1193         ops->initialized = false;
1194 finished:
1195
1196         fbcon_free_font(p);
1197         vc->vc_font.data = NULL;
1198
1199         if (vc->vc_hi_font_mask && vc->vc_screenbuf)
1200                 set_vc_hi_font(vc, false);
1201
1202         if (!con_is_bound(&fb_con))
1203                 fbcon_release_all();
1204
1205         if (vc->vc_num == logo_shown)
1206                 logo_shown = FBCON_LOGO_CANSHOW;
1207
1208         return;
1209 }
1210
1211 /* ====================================================================== */
1212
1213 /*  fbcon_XXX routines - interface used by the world
1214  *
1215  *  This system is now divided into two levels because of complications
1216  *  caused by hardware scrolling. Top level functions:
1217  *
1218  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1219  *
1220  *  handles y values in range [0, scr_height-1] that correspond to real
1221  *  screen positions. y_wrap shift means that first line of bitmap may be
1222  *  anywhere on this display. These functions convert lineoffsets to
1223  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1224  *
1225  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1226  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1227  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1228  *
1229  *  WARNING:
1230  *
1231  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1232  *  Implies should only really hardware scroll in rows. Only reason for
1233  *  restriction is simplicity & efficiency at the moment.
1234  */
1235
1236 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1237                         int width)
1238 {
1239         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1240         struct fbcon_ops *ops = info->fbcon_par;
1241
1242         struct fbcon_display *p = &fb_display[vc->vc_num];
1243         u_int y_break;
1244
1245         if (fbcon_is_inactive(vc, info))
1246                 return;
1247
1248         if (!height || !width)
1249                 return;
1250
1251         if (sy < vc->vc_top && vc->vc_top == logo_lines) {
1252                 vc->vc_top = 0;
1253                 /*
1254                  * If the font dimensions are not an integral of the display
1255                  * dimensions then the ops->clear below won't end up clearing
1256                  * the margins.  Call clear_margins here in case the logo
1257                  * bitmap stretched into the margin area.
1258                  */
1259                 fbcon_clear_margins(vc, 0);
1260         }
1261
1262         /* Split blits that cross physical y_wrap boundary */
1263
1264         y_break = p->vrows - p->yscroll;
1265         if (sy < y_break && sy + height - 1 >= y_break) {
1266                 u_int b = y_break - sy;
1267                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1268                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1269                                  width);
1270         } else
1271                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1272 }
1273
1274 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1275                         int count, int ypos, int xpos)
1276 {
1277         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1278         struct fbcon_display *p = &fb_display[vc->vc_num];
1279         struct fbcon_ops *ops = info->fbcon_par;
1280
1281         if (!fbcon_is_inactive(vc, info))
1282                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1283                            get_color(vc, info, scr_readw(s), 1),
1284                            get_color(vc, info, scr_readw(s), 0));
1285 }
1286
1287 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1288 {
1289         unsigned short chr;
1290
1291         scr_writew(c, &chr);
1292         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1293 }
1294
1295 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1296 {
1297         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1298         struct fbcon_ops *ops = info->fbcon_par;
1299
1300         if (!fbcon_is_inactive(vc, info))
1301                 ops->clear_margins(vc, info, margin_color, bottom_only);
1302 }
1303
1304 static void fbcon_cursor(struct vc_data *vc, int mode)
1305 {
1306         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1307         struct fbcon_ops *ops = info->fbcon_par;
1308         int c = scr_readw((u16 *) vc->vc_pos);
1309
1310         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1311
1312         if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
1313                 return;
1314
1315         if (vc->vc_cursor_type & CUR_SW)
1316                 fbcon_del_cursor_work(info);
1317         else
1318                 fbcon_add_cursor_work(info);
1319
1320         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1321
1322         if (!ops->cursor)
1323                 return;
1324
1325         ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
1326                     get_color(vc, info, c, 0));
1327 }
1328
1329 static int scrollback_phys_max = 0;
1330 static int scrollback_max = 0;
1331 static int scrollback_current = 0;
1332
1333 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1334                            int unit)
1335 {
1336         struct fbcon_display *p, *t;
1337         struct vc_data **default_mode, *vc;
1338         struct vc_data *svc;
1339         struct fbcon_ops *ops = info->fbcon_par;
1340         int rows, cols;
1341
1342         p = &fb_display[unit];
1343
1344         if (var_to_display(p, var, info))
1345                 return;
1346
1347         vc = vc_cons[unit].d;
1348
1349         if (!vc)
1350                 return;
1351
1352         default_mode = vc->vc_display_fg;
1353         svc = *default_mode;
1354         t = &fb_display[svc->vc_num];
1355
1356         if (!vc->vc_font.data) {
1357                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1358                 vc->vc_font.width = (*default_mode)->vc_font.width;
1359                 vc->vc_font.height = (*default_mode)->vc_font.height;
1360                 vc->vc_font.charcount = (*default_mode)->vc_font.charcount;
1361                 p->userfont = t->userfont;
1362                 if (p->userfont)
1363                         REFCOUNT(p->fontdata)++;
1364         }
1365
1366         var->activate = FB_ACTIVATE_NOW;
1367         info->var.activate = var->activate;
1368         var->yoffset = info->var.yoffset;
1369         var->xoffset = info->var.xoffset;
1370         fb_set_var(info, var);
1371         ops->var = info->var;
1372         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1373         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1374         if (vc->vc_font.charcount == 256) {
1375                 vc->vc_hi_font_mask = 0;
1376         } else {
1377                 vc->vc_hi_font_mask = 0x100;
1378                 if (vc->vc_can_do_color)
1379                         vc->vc_complement_mask <<= 1;
1380         }
1381
1382         if (!*svc->uni_pagedict_loc)
1383                 con_set_default_unimap(svc);
1384         if (!*vc->uni_pagedict_loc)
1385                 con_copy_unimap(vc, svc);
1386
1387         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1388         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1389         cols /= vc->vc_font.width;
1390         rows /= vc->vc_font.height;
1391         vc_resize(vc, cols, rows);
1392
1393         if (con_is_visible(vc)) {
1394                 update_screen(vc);
1395         }
1396 }
1397
1398 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1399 {
1400         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1401         struct fbcon_ops *ops = info->fbcon_par;
1402         struct fbcon_display *p = &fb_display[vc->vc_num];
1403
1404         p->yscroll += count;
1405         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1406                 p->yscroll -= p->vrows;
1407         ops->var.xoffset = 0;
1408         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1409         ops->var.vmode |= FB_VMODE_YWRAP;
1410         ops->update_start(info);
1411         scrollback_max += count;
1412         if (scrollback_max > scrollback_phys_max)
1413                 scrollback_max = scrollback_phys_max;
1414         scrollback_current = 0;
1415 }
1416
1417 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1418 {
1419         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1420         struct fbcon_ops *ops = info->fbcon_par;
1421         struct fbcon_display *p = &fb_display[vc->vc_num];
1422
1423         p->yscroll -= count;
1424         if (p->yscroll < 0)     /* Deal with wrap */
1425                 p->yscroll += p->vrows;
1426         ops->var.xoffset = 0;
1427         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1428         ops->var.vmode |= FB_VMODE_YWRAP;
1429         ops->update_start(info);
1430         scrollback_max -= count;
1431         if (scrollback_max < 0)
1432                 scrollback_max = 0;
1433         scrollback_current = 0;
1434 }
1435
1436 static __inline__ void ypan_up(struct vc_data *vc, int count)
1437 {
1438         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1439         struct fbcon_display *p = &fb_display[vc->vc_num];
1440         struct fbcon_ops *ops = info->fbcon_par;
1441
1442         p->yscroll += count;
1443         if (p->yscroll > p->vrows - vc->vc_rows) {
1444                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1445                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1446                 p->yscroll -= p->vrows - vc->vc_rows;
1447         }
1448
1449         ops->var.xoffset = 0;
1450         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1451         ops->var.vmode &= ~FB_VMODE_YWRAP;
1452         ops->update_start(info);
1453         fbcon_clear_margins(vc, 1);
1454         scrollback_max += count;
1455         if (scrollback_max > scrollback_phys_max)
1456                 scrollback_max = scrollback_phys_max;
1457         scrollback_current = 0;
1458 }
1459
1460 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1461 {
1462         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1463         struct fbcon_ops *ops = info->fbcon_par;
1464         struct fbcon_display *p = &fb_display[vc->vc_num];
1465
1466         p->yscroll += count;
1467
1468         if (p->yscroll > p->vrows - vc->vc_rows) {
1469                 p->yscroll -= p->vrows - vc->vc_rows;
1470                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1471         }
1472
1473         ops->var.xoffset = 0;
1474         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1475         ops->var.vmode &= ~FB_VMODE_YWRAP;
1476         ops->update_start(info);
1477         fbcon_clear_margins(vc, 1);
1478         scrollback_max += count;
1479         if (scrollback_max > scrollback_phys_max)
1480                 scrollback_max = scrollback_phys_max;
1481         scrollback_current = 0;
1482 }
1483
1484 static __inline__ void ypan_down(struct vc_data *vc, int count)
1485 {
1486         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1487         struct fbcon_display *p = &fb_display[vc->vc_num];
1488         struct fbcon_ops *ops = info->fbcon_par;
1489
1490         p->yscroll -= count;
1491         if (p->yscroll < 0) {
1492                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1493                             0, vc->vc_rows, vc->vc_cols);
1494                 p->yscroll += p->vrows - vc->vc_rows;
1495         }
1496
1497         ops->var.xoffset = 0;
1498         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1499         ops->var.vmode &= ~FB_VMODE_YWRAP;
1500         ops->update_start(info);
1501         fbcon_clear_margins(vc, 1);
1502         scrollback_max -= count;
1503         if (scrollback_max < 0)
1504                 scrollback_max = 0;
1505         scrollback_current = 0;
1506 }
1507
1508 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1509 {
1510         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1511         struct fbcon_ops *ops = info->fbcon_par;
1512         struct fbcon_display *p = &fb_display[vc->vc_num];
1513
1514         p->yscroll -= count;
1515
1516         if (p->yscroll < 0) {
1517                 p->yscroll += p->vrows - vc->vc_rows;
1518                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1519         }
1520
1521         ops->var.xoffset = 0;
1522         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1523         ops->var.vmode &= ~FB_VMODE_YWRAP;
1524         ops->update_start(info);
1525         fbcon_clear_margins(vc, 1);
1526         scrollback_max -= count;
1527         if (scrollback_max < 0)
1528                 scrollback_max = 0;
1529         scrollback_current = 0;
1530 }
1531
1532 static void fbcon_redraw_move(struct vc_data *vc, struct fbcon_display *p,
1533                               int line, int count, int dy)
1534 {
1535         unsigned short *s = (unsigned short *)
1536                 (vc->vc_origin + vc->vc_size_row * line);
1537
1538         while (count--) {
1539                 unsigned short *start = s;
1540                 unsigned short *le = advance_row(s, 1);
1541                 unsigned short c;
1542                 int x = 0;
1543                 unsigned short attr = 1;
1544
1545                 do {
1546                         c = scr_readw(s);
1547                         if (attr != (c & 0xff00)) {
1548                                 attr = c & 0xff00;
1549                                 if (s > start) {
1550                                         fbcon_putcs(vc, start, s - start,
1551                                                     dy, x);
1552                                         x += s - start;
1553                                         start = s;
1554                                 }
1555                         }
1556                         console_conditional_schedule();
1557                         s++;
1558                 } while (s < le);
1559                 if (s > start)
1560                         fbcon_putcs(vc, start, s - start, dy, x);
1561                 console_conditional_schedule();
1562                 dy++;
1563         }
1564 }
1565
1566 static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
1567                         struct fbcon_display *p, int line, int count, int ycount)
1568 {
1569         int offset = ycount * vc->vc_cols;
1570         unsigned short *d = (unsigned short *)
1571             (vc->vc_origin + vc->vc_size_row * line);
1572         unsigned short *s = d + offset;
1573         struct fbcon_ops *ops = info->fbcon_par;
1574
1575         while (count--) {
1576                 unsigned short *start = s;
1577                 unsigned short *le = advance_row(s, 1);
1578                 unsigned short c;
1579                 int x = 0;
1580
1581                 do {
1582                         c = scr_readw(s);
1583
1584                         if (c == scr_readw(d)) {
1585                                 if (s > start) {
1586                                         ops->bmove(vc, info, line + ycount, x,
1587                                                    line, x, 1, s-start);
1588                                         x += s - start + 1;
1589                                         start = s + 1;
1590                                 } else {
1591                                         x++;
1592                                         start++;
1593                                 }
1594                         }
1595
1596                         scr_writew(c, d);
1597                         console_conditional_schedule();
1598                         s++;
1599                         d++;
1600                 } while (s < le);
1601                 if (s > start)
1602                         ops->bmove(vc, info, line + ycount, x, line, x, 1,
1603                                    s-start);
1604                 console_conditional_schedule();
1605                 if (ycount > 0)
1606                         line++;
1607                 else {
1608                         line--;
1609                         /* NOTE: We subtract two lines from these pointers */
1610                         s -= vc->vc_size_row;
1611                         d -= vc->vc_size_row;
1612                 }
1613         }
1614 }
1615
1616 static void fbcon_redraw(struct vc_data *vc, struct fbcon_display *p,
1617                          int line, int count, int offset)
1618 {
1619         unsigned short *d = (unsigned short *)
1620             (vc->vc_origin + vc->vc_size_row * line);
1621         unsigned short *s = d + offset;
1622
1623         while (count--) {
1624                 unsigned short *start = s;
1625                 unsigned short *le = advance_row(s, 1);
1626                 unsigned short c;
1627                 int x = 0;
1628                 unsigned short attr = 1;
1629
1630                 do {
1631                         c = scr_readw(s);
1632                         if (attr != (c & 0xff00)) {
1633                                 attr = c & 0xff00;
1634                                 if (s > start) {
1635                                         fbcon_putcs(vc, start, s - start,
1636                                                     line, x);
1637                                         x += s - start;
1638                                         start = s;
1639                                 }
1640                         }
1641                         if (c == scr_readw(d)) {
1642                                 if (s > start) {
1643                                         fbcon_putcs(vc, start, s - start,
1644                                                      line, x);
1645                                         x += s - start + 1;
1646                                         start = s + 1;
1647                                 } else {
1648                                         x++;
1649                                         start++;
1650                                 }
1651                         }
1652                         scr_writew(c, d);
1653                         console_conditional_schedule();
1654                         s++;
1655                         d++;
1656                 } while (s < le);
1657                 if (s > start)
1658                         fbcon_putcs(vc, start, s - start, line, x);
1659                 console_conditional_schedule();
1660                 if (offset > 0)
1661                         line++;
1662                 else {
1663                         line--;
1664                         /* NOTE: We subtract two lines from these pointers */
1665                         s -= vc->vc_size_row;
1666                         d -= vc->vc_size_row;
1667                 }
1668         }
1669 }
1670
1671 static void fbcon_bmove_rec(struct vc_data *vc, struct fbcon_display *p, int sy, int sx,
1672                             int dy, int dx, int height, int width, u_int y_break)
1673 {
1674         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1675         struct fbcon_ops *ops = info->fbcon_par;
1676         u_int b;
1677
1678         if (sy < y_break && sy + height > y_break) {
1679                 b = y_break - sy;
1680                 if (dy < sy) {  /* Avoid trashing self */
1681                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1682                                         y_break);
1683                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1684                                         height - b, width, y_break);
1685                 } else {
1686                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1687                                         height - b, width, y_break);
1688                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1689                                         y_break);
1690                 }
1691                 return;
1692         }
1693
1694         if (dy < y_break && dy + height > y_break) {
1695                 b = y_break - dy;
1696                 if (dy < sy) {  /* Avoid trashing self */
1697                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1698                                         y_break);
1699                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1700                                         height - b, width, y_break);
1701                 } else {
1702                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1703                                         height - b, width, y_break);
1704                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1705                                         y_break);
1706                 }
1707                 return;
1708         }
1709         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1710                    height, width);
1711 }
1712
1713 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1714                         int height, int width)
1715 {
1716         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1717         struct fbcon_display *p = &fb_display[vc->vc_num];
1718
1719         if (fbcon_is_inactive(vc, info))
1720                 return;
1721
1722         if (!width || !height)
1723                 return;
1724
1725         /*  Split blits that cross physical y_wrap case.
1726          *  Pathological case involves 4 blits, better to use recursive
1727          *  code rather than unrolled case
1728          *
1729          *  Recursive invocations don't need to erase the cursor over and
1730          *  over again, so we use fbcon_bmove_rec()
1731          */
1732         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1733                         p->vrows - p->yscroll);
1734 }
1735
1736 static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
1737                 enum con_scroll dir, unsigned int count)
1738 {
1739         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1740         struct fbcon_display *p = &fb_display[vc->vc_num];
1741         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1742
1743         if (fbcon_is_inactive(vc, info))
1744                 return true;
1745
1746         fbcon_cursor(vc, CM_ERASE);
1747
1748         /*
1749          * ++Geert: Only use ywrap/ypan if the console is in text mode
1750          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1751          *           whole screen (prevents flicker).
1752          */
1753
1754         switch (dir) {
1755         case SM_UP:
1756                 if (count > vc->vc_rows)        /* Maximum realistic size */
1757                         count = vc->vc_rows;
1758                 switch (fb_scrollmode(p)) {
1759                 case SCROLL_MOVE:
1760                         fbcon_redraw_blit(vc, info, p, t, b - t - count,
1761                                      count);
1762                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1763                         scr_memsetw((unsigned short *) (vc->vc_origin +
1764                                                         vc->vc_size_row *
1765                                                         (b - count)),
1766                                     vc->vc_video_erase_char,
1767                                     vc->vc_size_row * count);
1768                         return true;
1769
1770                 case SCROLL_WRAP_MOVE:
1771                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1772                                 if (t > 0)
1773                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1774                                                     vc->vc_cols);
1775                                 ywrap_up(vc, count);
1776                                 if (vc->vc_rows - b > 0)
1777                                         fbcon_bmove(vc, b - count, 0, b, 0,
1778                                                     vc->vc_rows - b,
1779                                                     vc->vc_cols);
1780                         } else if (info->flags & FBINFO_READS_FAST)
1781                                 fbcon_bmove(vc, t + count, 0, t, 0,
1782                                             b - t - count, vc->vc_cols);
1783                         else
1784                                 goto redraw_up;
1785                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1786                         break;
1787
1788                 case SCROLL_PAN_REDRAW:
1789                         if ((p->yscroll + count <=
1790                              2 * (p->vrows - vc->vc_rows))
1791                             && ((!scroll_partial && (b - t == vc->vc_rows))
1792                                 || (scroll_partial
1793                                     && (b - t - count >
1794                                         3 * vc->vc_rows >> 2)))) {
1795                                 if (t > 0)
1796                                         fbcon_redraw_move(vc, p, 0, t, count);
1797                                 ypan_up_redraw(vc, t, count);
1798                                 if (vc->vc_rows - b > 0)
1799                                         fbcon_redraw_move(vc, p, b,
1800                                                           vc->vc_rows - b, b);
1801                         } else
1802                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1803                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1804                         break;
1805
1806                 case SCROLL_PAN_MOVE:
1807                         if ((p->yscroll + count <=
1808                              2 * (p->vrows - vc->vc_rows))
1809                             && ((!scroll_partial && (b - t == vc->vc_rows))
1810                                 || (scroll_partial
1811                                     && (b - t - count >
1812                                         3 * vc->vc_rows >> 2)))) {
1813                                 if (t > 0)
1814                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1815                                                     vc->vc_cols);
1816                                 ypan_up(vc, count);
1817                                 if (vc->vc_rows - b > 0)
1818                                         fbcon_bmove(vc, b - count, 0, b, 0,
1819                                                     vc->vc_rows - b,
1820                                                     vc->vc_cols);
1821                         } else if (info->flags & FBINFO_READS_FAST)
1822                                 fbcon_bmove(vc, t + count, 0, t, 0,
1823                                             b - t - count, vc->vc_cols);
1824                         else
1825                                 goto redraw_up;
1826                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1827                         break;
1828
1829                 case SCROLL_REDRAW:
1830                       redraw_up:
1831                         fbcon_redraw(vc, p, t, b - t - count,
1832                                      count * vc->vc_cols);
1833                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1834                         scr_memsetw((unsigned short *) (vc->vc_origin +
1835                                                         vc->vc_size_row *
1836                                                         (b - count)),
1837                                     vc->vc_video_erase_char,
1838                                     vc->vc_size_row * count);
1839                         return true;
1840                 }
1841                 break;
1842
1843         case SM_DOWN:
1844                 if (count > vc->vc_rows)        /* Maximum realistic size */
1845                         count = vc->vc_rows;
1846                 switch (fb_scrollmode(p)) {
1847                 case SCROLL_MOVE:
1848                         fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
1849                                      -count);
1850                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1851                         scr_memsetw((unsigned short *) (vc->vc_origin +
1852                                                         vc->vc_size_row *
1853                                                         t),
1854                                     vc->vc_video_erase_char,
1855                                     vc->vc_size_row * count);
1856                         return true;
1857
1858                 case SCROLL_WRAP_MOVE:
1859                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1860                                 if (vc->vc_rows - b > 0)
1861                                         fbcon_bmove(vc, b, 0, b - count, 0,
1862                                                     vc->vc_rows - b,
1863                                                     vc->vc_cols);
1864                                 ywrap_down(vc, count);
1865                                 if (t > 0)
1866                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1867                                                     vc->vc_cols);
1868                         } else if (info->flags & FBINFO_READS_FAST)
1869                                 fbcon_bmove(vc, t, 0, t + count, 0,
1870                                             b - t - count, vc->vc_cols);
1871                         else
1872                                 goto redraw_down;
1873                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1874                         break;
1875
1876                 case SCROLL_PAN_MOVE:
1877                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1878                             && ((!scroll_partial && (b - t == vc->vc_rows))
1879                                 || (scroll_partial
1880                                     && (b - t - count >
1881                                         3 * vc->vc_rows >> 2)))) {
1882                                 if (vc->vc_rows - b > 0)
1883                                         fbcon_bmove(vc, b, 0, b - count, 0,
1884                                                     vc->vc_rows - b,
1885                                                     vc->vc_cols);
1886                                 ypan_down(vc, count);
1887                                 if (t > 0)
1888                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1889                                                     vc->vc_cols);
1890                         } else if (info->flags & FBINFO_READS_FAST)
1891                                 fbcon_bmove(vc, t, 0, t + count, 0,
1892                                             b - t - count, vc->vc_cols);
1893                         else
1894                                 goto redraw_down;
1895                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1896                         break;
1897
1898                 case SCROLL_PAN_REDRAW:
1899                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1900                             && ((!scroll_partial && (b - t == vc->vc_rows))
1901                                 || (scroll_partial
1902                                     && (b - t - count >
1903                                         3 * vc->vc_rows >> 2)))) {
1904                                 if (vc->vc_rows - b > 0)
1905                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1906                                                           b - count);
1907                                 ypan_down_redraw(vc, t, count);
1908                                 if (t > 0)
1909                                         fbcon_redraw_move(vc, p, count, t, 0);
1910                         } else
1911                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1912                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1913                         break;
1914
1915                 case SCROLL_REDRAW:
1916                       redraw_down:
1917                         fbcon_redraw(vc, p, b - 1, b - t - count,
1918                                      -count * vc->vc_cols);
1919                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1920                         scr_memsetw((unsigned short *) (vc->vc_origin +
1921                                                         vc->vc_size_row *
1922                                                         t),
1923                                     vc->vc_video_erase_char,
1924                                     vc->vc_size_row * count);
1925                         return true;
1926                 }
1927         }
1928         return false;
1929 }
1930
1931
1932 static void updatescrollmode_accel(struct fbcon_display *p,
1933                                         struct fb_info *info,
1934                                         struct vc_data *vc)
1935 {
1936 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
1937         struct fbcon_ops *ops = info->fbcon_par;
1938         int cap = info->flags;
1939         u16 t = 0;
1940         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
1941                                   info->fix.xpanstep);
1942         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
1943         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1944         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1945                                    info->var.xres_virtual);
1946         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
1947                 divides(ypan, vc->vc_font.height) && vyres > yres;
1948         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
1949                 divides(ywrap, vc->vc_font.height) &&
1950                 divides(vc->vc_font.height, vyres) &&
1951                 divides(vc->vc_font.height, yres);
1952         int reading_fast = cap & FBINFO_READS_FAST;
1953         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
1954                 !(cap & FBINFO_HWACCEL_DISABLED);
1955         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
1956                 !(cap & FBINFO_HWACCEL_DISABLED);
1957
1958         if (good_wrap || good_pan) {
1959                 if (reading_fast || fast_copyarea)
1960                         p->scrollmode = good_wrap ?
1961                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
1962                 else
1963                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
1964                                 SCROLL_PAN_REDRAW;
1965         } else {
1966                 if (reading_fast || (fast_copyarea && !fast_imageblit))
1967                         p->scrollmode = SCROLL_MOVE;
1968                 else
1969                         p->scrollmode = SCROLL_REDRAW;
1970         }
1971 #endif
1972 }
1973
1974 static void updatescrollmode(struct fbcon_display *p,
1975                                         struct fb_info *info,
1976                                         struct vc_data *vc)
1977 {
1978         struct fbcon_ops *ops = info->fbcon_par;
1979         int fh = vc->vc_font.height;
1980         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1981         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1982                                    info->var.xres_virtual);
1983
1984         p->vrows = vyres/fh;
1985         if (yres > (fh * (vc->vc_rows + 1)))
1986                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
1987         if ((yres % fh) && (vyres % fh < yres % fh))
1988                 p->vrows--;
1989
1990         /* update scrollmode in case hardware acceleration is used */
1991         updatescrollmode_accel(p, info, vc);
1992 }
1993
1994 #define PITCH(w) (((w) + 7) >> 3)
1995 #define CALC_FONTSZ(h, p, c) ((h) * (p) * (c)) /* size = height * pitch * charcount */
1996
1997 static int fbcon_resize(struct vc_data *vc, unsigned int width,
1998                         unsigned int height, unsigned int user)
1999 {
2000         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2001         struct fbcon_ops *ops = info->fbcon_par;
2002         struct fbcon_display *p = &fb_display[vc->vc_num];
2003         struct fb_var_screeninfo var = info->var;
2004         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2005
2006         if (p->userfont && FNTSIZE(vc->vc_font.data)) {
2007                 int size;
2008                 int pitch = PITCH(vc->vc_font.width);
2009
2010                 /*
2011                  * If user font, ensure that a possible change to user font
2012                  * height or width will not allow a font data out-of-bounds access.
2013                  * NOTE: must use original charcount in calculation as font
2014                  * charcount can change and cannot be used to determine the
2015                  * font data allocated size.
2016                  */
2017                 if (pitch <= 0)
2018                         return -EINVAL;
2019                 size = CALC_FONTSZ(vc->vc_font.height, pitch, vc->vc_font.charcount);
2020                 if (size > FNTSIZE(vc->vc_font.data))
2021                         return -EINVAL;
2022         }
2023
2024         virt_w = FBCON_SWAP(ops->rotate, width, height);
2025         virt_h = FBCON_SWAP(ops->rotate, height, width);
2026         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2027                                  vc->vc_font.height);
2028         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2029                                  vc->vc_font.width);
2030         var.xres = virt_w * virt_fw;
2031         var.yres = virt_h * virt_fh;
2032         x_diff = info->var.xres - var.xres;
2033         y_diff = info->var.yres - var.yres;
2034         if (x_diff < 0 || x_diff > virt_fw ||
2035             y_diff < 0 || y_diff > virt_fh) {
2036                 const struct fb_videomode *mode;
2037
2038                 pr_debug("attempting resize %ix%i\n", var.xres, var.yres);
2039                 mode = fb_find_best_mode(&var, &info->modelist);
2040                 if (mode == NULL)
2041                         return -EINVAL;
2042                 display_to_var(&var, p);
2043                 fb_videomode_to_var(&var, mode);
2044
2045                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2046                         return -EINVAL;
2047
2048                 pr_debug("resize now %ix%i\n", var.xres, var.yres);
2049                 if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
2050                         var.activate = FB_ACTIVATE_NOW |
2051                                 FB_ACTIVATE_FORCE;
2052                         fb_set_var(info, &var);
2053                 }
2054                 var_to_display(p, &info->var, info);
2055                 ops->var = info->var;
2056         }
2057         updatescrollmode(p, info, vc);
2058         return 0;
2059 }
2060
2061 static int fbcon_switch(struct vc_data *vc)
2062 {
2063         struct fb_info *info, *old_info = NULL;
2064         struct fbcon_ops *ops;
2065         struct fbcon_display *p = &fb_display[vc->vc_num];
2066         struct fb_var_screeninfo var;
2067         int i, ret, prev_console;
2068
2069         info = fbcon_info_from_console(vc->vc_num);
2070         ops = info->fbcon_par;
2071
2072         if (logo_shown >= 0) {
2073                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2074
2075                 if (conp2->vc_top == logo_lines
2076                     && conp2->vc_bottom == conp2->vc_rows)
2077                         conp2->vc_top = 0;
2078                 logo_shown = FBCON_LOGO_CANSHOW;
2079         }
2080
2081         prev_console = ops->currcon;
2082         if (prev_console != -1)
2083                 old_info = fbcon_info_from_console(prev_console);
2084         /*
2085          * FIXME: If we have multiple fbdev's loaded, we need to
2086          * update all info->currcon.  Perhaps, we can place this
2087          * in a centralized structure, but this might break some
2088          * drivers.
2089          *
2090          * info->currcon = vc->vc_num;
2091          */
2092         fbcon_for_each_registered_fb(i) {
2093                 if (fbcon_registered_fb[i]->fbcon_par) {
2094                         struct fbcon_ops *o = fbcon_registered_fb[i]->fbcon_par;
2095
2096                         o->currcon = vc->vc_num;
2097                 }
2098         }
2099         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2100         display_to_var(&var, p);
2101         var.activate = FB_ACTIVATE_NOW;
2102
2103         /*
2104          * make sure we don't unnecessarily trip the memcmp()
2105          * in fb_set_var()
2106          */
2107         info->var.activate = var.activate;
2108         var.vmode |= info->var.vmode & ~FB_VMODE_MASK;
2109         fb_set_var(info, &var);
2110         ops->var = info->var;
2111
2112         if (old_info != NULL && (old_info != info ||
2113                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2114                 if (info->fbops->fb_set_par) {
2115                         ret = info->fbops->fb_set_par(info);
2116
2117                         if (ret)
2118                                 printk(KERN_ERR "fbcon_switch: detected "
2119                                         "unhandled fb_set_par error, "
2120                                         "error code %d\n", ret);
2121                 }
2122
2123                 if (old_info != info)
2124                         fbcon_del_cursor_work(old_info);
2125         }
2126
2127         if (fbcon_is_inactive(vc, info) ||
2128             ops->blank_state != FB_BLANK_UNBLANK)
2129                 fbcon_del_cursor_work(info);
2130         else
2131                 fbcon_add_cursor_work(info);
2132
2133         set_blitting_type(vc, info);
2134         ops->cursor_reset = 1;
2135
2136         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2137                 ops->rotate = FB_ROTATE_UR;
2138                 set_blitting_type(vc, info);
2139         }
2140
2141         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2142         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2143
2144         if (vc->vc_font.charcount > 256)
2145                 vc->vc_complement_mask <<= 1;
2146
2147         updatescrollmode(p, info, vc);
2148
2149         switch (fb_scrollmode(p)) {
2150         case SCROLL_WRAP_MOVE:
2151                 scrollback_phys_max = p->vrows - vc->vc_rows;
2152                 break;
2153         case SCROLL_PAN_MOVE:
2154         case SCROLL_PAN_REDRAW:
2155                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2156                 if (scrollback_phys_max < 0)
2157                         scrollback_phys_max = 0;
2158                 break;
2159         default:
2160                 scrollback_phys_max = 0;
2161                 break;
2162         }
2163
2164         scrollback_max = 0;
2165         scrollback_current = 0;
2166
2167         if (!fbcon_is_inactive(vc, info)) {
2168             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2169             ops->update_start(info);
2170         }
2171
2172         fbcon_set_palette(vc, color_table);
2173         fbcon_clear_margins(vc, 0);
2174
2175         if (logo_shown == FBCON_LOGO_DRAW) {
2176
2177                 logo_shown = fg_console;
2178                 fb_show_logo(info, ops->rotate);
2179                 update_region(vc,
2180                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2181                               vc->vc_size_row * (vc->vc_bottom -
2182                                                  vc->vc_top) / 2);
2183                 return 0;
2184         }
2185         return 1;
2186 }
2187
2188 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2189                                 int blank)
2190 {
2191         if (blank) {
2192                 unsigned short charmask = vc->vc_hi_font_mask ?
2193                         0x1ff : 0xff;
2194                 unsigned short oldc;
2195
2196                 oldc = vc->vc_video_erase_char;
2197                 vc->vc_video_erase_char &= charmask;
2198                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2199                 vc->vc_video_erase_char = oldc;
2200         }
2201 }
2202
2203 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2204 {
2205         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2206         struct fbcon_ops *ops = info->fbcon_par;
2207
2208         if (mode_switch) {
2209                 struct fb_var_screeninfo var = info->var;
2210
2211                 ops->graphics = 1;
2212
2213                 if (!blank) {
2214                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE |
2215                                 FB_ACTIVATE_KD_TEXT;
2216                         fb_set_var(info, &var);
2217                         ops->graphics = 0;
2218                         ops->var = info->var;
2219                 }
2220         }
2221
2222         if (!fbcon_is_inactive(vc, info)) {
2223                 if (ops->blank_state != blank) {
2224                         ops->blank_state = blank;
2225                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2226                         ops->cursor_flash = (!blank);
2227
2228                         if (fb_blank(info, blank))
2229                                 fbcon_generic_blank(vc, info, blank);
2230                 }
2231
2232                 if (!blank)
2233                         update_screen(vc);
2234         }
2235
2236         if (mode_switch || fbcon_is_inactive(vc, info) ||
2237             ops->blank_state != FB_BLANK_UNBLANK)
2238                 fbcon_del_cursor_work(info);
2239         else
2240                 fbcon_add_cursor_work(info);
2241
2242         return 0;
2243 }
2244
2245 static int fbcon_debug_enter(struct vc_data *vc)
2246 {
2247         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2248         struct fbcon_ops *ops = info->fbcon_par;
2249
2250         ops->save_graphics = ops->graphics;
2251         ops->graphics = 0;
2252         if (info->fbops->fb_debug_enter)
2253                 info->fbops->fb_debug_enter(info);
2254         fbcon_set_palette(vc, color_table);
2255         return 0;
2256 }
2257
2258 static int fbcon_debug_leave(struct vc_data *vc)
2259 {
2260         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2261         struct fbcon_ops *ops = info->fbcon_par;
2262
2263         ops->graphics = ops->save_graphics;
2264         if (info->fbops->fb_debug_leave)
2265                 info->fbops->fb_debug_leave(info);
2266         return 0;
2267 }
2268
2269 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2270 {
2271         u8 *fontdata = vc->vc_font.data;
2272         u8 *data = font->data;
2273         int i, j;
2274
2275         font->width = vc->vc_font.width;
2276         font->height = vc->vc_font.height;
2277         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2278         if (!font->data)
2279                 return 0;
2280
2281         if (font->width <= 8) {
2282                 j = vc->vc_font.height;
2283                 if (font->charcount * j > FNTSIZE(fontdata))
2284                         return -EINVAL;
2285
2286                 for (i = 0; i < font->charcount; i++) {
2287                         memcpy(data, fontdata, j);
2288                         memset(data + j, 0, 32 - j);
2289                         data += 32;
2290                         fontdata += j;
2291                 }
2292         } else if (font->width <= 16) {
2293                 j = vc->vc_font.height * 2;
2294                 if (font->charcount * j > FNTSIZE(fontdata))
2295                         return -EINVAL;
2296
2297                 for (i = 0; i < font->charcount; i++) {
2298                         memcpy(data, fontdata, j);
2299                         memset(data + j, 0, 64 - j);
2300                         data += 64;
2301                         fontdata += j;
2302                 }
2303         } else if (font->width <= 24) {
2304                 if (font->charcount * (vc->vc_font.height * sizeof(u32)) > FNTSIZE(fontdata))
2305                         return -EINVAL;
2306
2307                 for (i = 0; i < font->charcount; i++) {
2308                         for (j = 0; j < vc->vc_font.height; j++) {
2309                                 *data++ = fontdata[0];
2310                                 *data++ = fontdata[1];
2311                                 *data++ = fontdata[2];
2312                                 fontdata += sizeof(u32);
2313                         }
2314                         memset(data, 0, 3 * (32 - j));
2315                         data += 3 * (32 - j);
2316                 }
2317         } else {
2318                 j = vc->vc_font.height * 4;
2319                 if (font->charcount * j > FNTSIZE(fontdata))
2320                         return -EINVAL;
2321
2322                 for (i = 0; i < font->charcount; i++) {
2323                         memcpy(data, fontdata, j);
2324                         memset(data + j, 0, 128 - j);
2325                         data += 128;
2326                         fontdata += j;
2327                 }
2328         }
2329         return 0;
2330 }
2331
2332 /* set/clear vc_hi_font_mask and update vc attrs accordingly */
2333 static void set_vc_hi_font(struct vc_data *vc, bool set)
2334 {
2335         if (!set) {
2336                 vc->vc_hi_font_mask = 0;
2337                 if (vc->vc_can_do_color) {
2338                         vc->vc_complement_mask >>= 1;
2339                         vc->vc_s_complement_mask >>= 1;
2340                 }
2341
2342                 /* ++Edmund: reorder the attribute bits */
2343                 if (vc->vc_can_do_color) {
2344                         unsigned short *cp =
2345                             (unsigned short *) vc->vc_origin;
2346                         int count = vc->vc_screenbuf_size / 2;
2347                         unsigned short c;
2348                         for (; count > 0; count--, cp++) {
2349                                 c = scr_readw(cp);
2350                                 scr_writew(((c & 0xfe00) >> 1) |
2351                                            (c & 0xff), cp);
2352                         }
2353                         c = vc->vc_video_erase_char;
2354                         vc->vc_video_erase_char =
2355                             ((c & 0xfe00) >> 1) | (c & 0xff);
2356                         vc->vc_attr >>= 1;
2357                 }
2358         } else {
2359                 vc->vc_hi_font_mask = 0x100;
2360                 if (vc->vc_can_do_color) {
2361                         vc->vc_complement_mask <<= 1;
2362                         vc->vc_s_complement_mask <<= 1;
2363                 }
2364
2365                 /* ++Edmund: reorder the attribute bits */
2366                 {
2367                         unsigned short *cp =
2368                             (unsigned short *) vc->vc_origin;
2369                         int count = vc->vc_screenbuf_size / 2;
2370                         unsigned short c;
2371                         for (; count > 0; count--, cp++) {
2372                                 unsigned short newc;
2373                                 c = scr_readw(cp);
2374                                 if (vc->vc_can_do_color)
2375                                         newc =
2376                                             ((c & 0xff00) << 1) | (c &
2377                                                                    0xff);
2378                                 else
2379                                         newc = c & ~0x100;
2380                                 scr_writew(newc, cp);
2381                         }
2382                         c = vc->vc_video_erase_char;
2383                         if (vc->vc_can_do_color) {
2384                                 vc->vc_video_erase_char =
2385                                     ((c & 0xff00) << 1) | (c & 0xff);
2386                                 vc->vc_attr <<= 1;
2387                         } else
2388                                 vc->vc_video_erase_char = c & ~0x100;
2389                 }
2390         }
2391 }
2392
2393 static int fbcon_do_set_font(struct vc_data *vc, int w, int h, int charcount,
2394                              const u8 * data, int userfont)
2395 {
2396         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2397         struct fbcon_ops *ops = info->fbcon_par;
2398         struct fbcon_display *p = &fb_display[vc->vc_num];
2399         int resize, ret, old_userfont, old_width, old_height, old_charcount;
2400         char *old_data = NULL;
2401
2402         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2403         if (p->userfont)
2404                 old_data = vc->vc_font.data;
2405         vc->vc_font.data = (void *)(p->fontdata = data);
2406         old_userfont = p->userfont;
2407         if ((p->userfont = userfont))
2408                 REFCOUNT(data)++;
2409
2410         old_width = vc->vc_font.width;
2411         old_height = vc->vc_font.height;
2412         old_charcount = vc->vc_font.charcount;
2413
2414         vc->vc_font.width = w;
2415         vc->vc_font.height = h;
2416         vc->vc_font.charcount = charcount;
2417         if (vc->vc_hi_font_mask && charcount == 256)
2418                 set_vc_hi_font(vc, false);
2419         else if (!vc->vc_hi_font_mask && charcount == 512)
2420                 set_vc_hi_font(vc, true);
2421
2422         if (resize) {
2423                 int cols, rows;
2424
2425                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2426                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2427                 cols /= w;
2428                 rows /= h;
2429                 ret = vc_resize(vc, cols, rows);
2430                 if (ret)
2431                         goto err_out;
2432         } else if (con_is_visible(vc)
2433                    && vc->vc_mode == KD_TEXT) {
2434                 fbcon_clear_margins(vc, 0);
2435                 update_screen(vc);
2436         }
2437
2438         if (old_data && (--REFCOUNT(old_data) == 0))
2439                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2440         return 0;
2441
2442 err_out:
2443         p->fontdata = old_data;
2444         vc->vc_font.data = (void *)old_data;
2445
2446         if (userfont) {
2447                 p->userfont = old_userfont;
2448                 if (--REFCOUNT(data) == 0)
2449                         kfree(data - FONT_EXTRA_WORDS * sizeof(int));
2450         }
2451
2452         vc->vc_font.width = old_width;
2453         vc->vc_font.height = old_height;
2454         vc->vc_font.charcount = old_charcount;
2455
2456         return ret;
2457 }
2458
2459 /*
2460  *  User asked to set font; we are guaranteed that
2461  *      a) width and height are in range 1..32
2462  *      b) charcount does not exceed 512
2463  *  but lets not assume that, since someone might someday want to use larger
2464  *  fonts. And charcount of 512 is small for unicode support.
2465  *
2466  *  However, user space gives the font in 32 rows , regardless of
2467  *  actual font height. So a new API is needed if support for larger fonts
2468  *  is ever implemented.
2469  */
2470
2471 static int fbcon_set_font(struct vc_data *vc, struct console_font *font,
2472                           unsigned int flags)
2473 {
2474         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2475         unsigned charcount = font->charcount;
2476         int w = font->width;
2477         int h = font->height;
2478         int size;
2479         int i, csum;
2480         u8 *new_data, *data = font->data;
2481         int pitch = PITCH(font->width);
2482
2483         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2484          * If not this check should be changed to charcount < 256 */
2485         if (charcount != 256 && charcount != 512)
2486                 return -EINVAL;
2487
2488         /* font bigger than screen resolution ? */
2489         if (w > FBCON_SWAP(info->var.rotate, info->var.xres, info->var.yres) ||
2490             h > FBCON_SWAP(info->var.rotate, info->var.yres, info->var.xres))
2491                 return -EINVAL;
2492
2493         /* Make sure drawing engine can handle the font */
2494         if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
2495             !(info->pixmap.blit_y & (1 << (font->height - 1))))
2496                 return -EINVAL;
2497
2498         /* Make sure driver can handle the font length */
2499         if (fbcon_invalid_charcount(info, charcount))
2500                 return -EINVAL;
2501
2502         size = CALC_FONTSZ(h, pitch, charcount);
2503
2504         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2505
2506         if (!new_data)
2507                 return -ENOMEM;
2508
2509         memset(new_data, 0, FONT_EXTRA_WORDS * sizeof(int));
2510
2511         new_data += FONT_EXTRA_WORDS * sizeof(int);
2512         FNTSIZE(new_data) = size;
2513         REFCOUNT(new_data) = 0; /* usage counter */
2514         for (i=0; i< charcount; i++) {
2515                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2516         }
2517
2518         /* Since linux has a nice crc32 function use it for counting font
2519          * checksums. */
2520         csum = crc32(0, new_data, size);
2521
2522         FNTSUM(new_data) = csum;
2523         /* Check if the same font is on some other console already */
2524         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2525                 struct vc_data *tmp = vc_cons[i].d;
2526
2527                 if (fb_display[i].userfont &&
2528                     fb_display[i].fontdata &&
2529                     FNTSUM(fb_display[i].fontdata) == csum &&
2530                     FNTSIZE(fb_display[i].fontdata) == size &&
2531                     tmp->vc_font.width == w &&
2532                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2533                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2534                         new_data = (u8 *)fb_display[i].fontdata;
2535                         break;
2536                 }
2537         }
2538         return fbcon_do_set_font(vc, font->width, font->height, charcount, new_data, 1);
2539 }
2540
2541 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2542 {
2543         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2544         const struct font_desc *f;
2545
2546         if (!name)
2547                 f = get_default_font(info->var.xres, info->var.yres,
2548                                      info->pixmap.blit_x, info->pixmap.blit_y);
2549         else if (!(f = find_font(name)))
2550                 return -ENOENT;
2551
2552         font->width = f->width;
2553         font->height = f->height;
2554         return fbcon_do_set_font(vc, f->width, f->height, f->charcount, f->data, 0);
2555 }
2556
2557 static u16 palette_red[16];
2558 static u16 palette_green[16];
2559 static u16 palette_blue[16];
2560
2561 static struct fb_cmap palette_cmap = {
2562         0, 16, palette_red, palette_green, palette_blue, NULL
2563 };
2564
2565 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table)
2566 {
2567         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2568         int i, j, k, depth;
2569         u8 val;
2570
2571         if (fbcon_is_inactive(vc, info))
2572                 return;
2573
2574         if (!con_is_visible(vc))
2575                 return;
2576
2577         depth = fb_get_color_depth(&info->var, &info->fix);
2578         if (depth > 3) {
2579                 for (i = j = 0; i < 16; i++) {
2580                         k = table[i];
2581                         val = vc->vc_palette[j++];
2582                         palette_red[k] = (val << 8) | val;
2583                         val = vc->vc_palette[j++];
2584                         palette_green[k] = (val << 8) | val;
2585                         val = vc->vc_palette[j++];
2586                         palette_blue[k] = (val << 8) | val;
2587                 }
2588                 palette_cmap.len = 16;
2589                 palette_cmap.start = 0;
2590         /*
2591          * If framebuffer is capable of less than 16 colors,
2592          * use default palette of fbcon.
2593          */
2594         } else
2595                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2596
2597         fb_set_cmap(&palette_cmap, info);
2598 }
2599
2600 static u16 *fbcon_screen_pos(const struct vc_data *vc, int offset)
2601 {
2602         return (u16 *) (vc->vc_origin + offset);
2603 }
2604
2605 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2606                                  int *px, int *py)
2607 {
2608         unsigned long ret;
2609         int x, y;
2610
2611         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2612                 unsigned long offset = (pos - vc->vc_origin) / 2;
2613
2614                 x = offset % vc->vc_cols;
2615                 y = offset / vc->vc_cols;
2616                 ret = pos + (vc->vc_cols - x) * 2;
2617         } else {
2618                 /* Should not happen */
2619                 x = y = 0;
2620                 ret = vc->vc_origin;
2621         }
2622         if (px)
2623                 *px = x;
2624         if (py)
2625                 *py = y;
2626         return ret;
2627 }
2628
2629 /* As we might be inside of softback, we may work with non-contiguous buffer,
2630    that's why we have to use a separate routine. */
2631 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2632 {
2633         while (cnt--) {
2634                 u16 a = scr_readw(p);
2635                 if (!vc->vc_can_do_color)
2636                         a ^= 0x0800;
2637                 else if (vc->vc_hi_font_mask == 0x100)
2638                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2639                             (((a) & 0x0e00) << 4);
2640                 else
2641                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2642                             (((a) & 0x0700) << 4);
2643                 scr_writew(a, p++);
2644         }
2645 }
2646
2647 void fbcon_suspended(struct fb_info *info)
2648 {
2649         struct vc_data *vc = NULL;
2650         struct fbcon_ops *ops = info->fbcon_par;
2651
2652         if (!ops || ops->currcon < 0)
2653                 return;
2654         vc = vc_cons[ops->currcon].d;
2655
2656         /* Clear cursor, restore saved data */
2657         fbcon_cursor(vc, CM_ERASE);
2658 }
2659
2660 void fbcon_resumed(struct fb_info *info)
2661 {
2662         struct vc_data *vc;
2663         struct fbcon_ops *ops = info->fbcon_par;
2664
2665         if (!ops || ops->currcon < 0)
2666                 return;
2667         vc = vc_cons[ops->currcon].d;
2668
2669         update_screen(vc);
2670 }
2671
2672 static void fbcon_modechanged(struct fb_info *info)
2673 {
2674         struct fbcon_ops *ops = info->fbcon_par;
2675         struct vc_data *vc;
2676         struct fbcon_display *p;
2677         int rows, cols;
2678
2679         if (!ops || ops->currcon < 0)
2680                 return;
2681         vc = vc_cons[ops->currcon].d;
2682         if (vc->vc_mode != KD_TEXT ||
2683             fbcon_info_from_console(ops->currcon) != info)
2684                 return;
2685
2686         p = &fb_display[vc->vc_num];
2687         set_blitting_type(vc, info);
2688
2689         if (con_is_visible(vc)) {
2690                 var_to_display(p, &info->var, info);
2691                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2692                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2693                 cols /= vc->vc_font.width;
2694                 rows /= vc->vc_font.height;
2695                 vc_resize(vc, cols, rows);
2696                 updatescrollmode(p, info, vc);
2697                 scrollback_max = 0;
2698                 scrollback_current = 0;
2699
2700                 if (!fbcon_is_inactive(vc, info)) {
2701                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2702                     ops->update_start(info);
2703                 }
2704
2705                 fbcon_set_palette(vc, color_table);
2706                 update_screen(vc);
2707         }
2708 }
2709
2710 static void fbcon_set_all_vcs(struct fb_info *info)
2711 {
2712         struct fbcon_ops *ops = info->fbcon_par;
2713         struct vc_data *vc;
2714         struct fbcon_display *p;
2715         int i, rows, cols, fg = -1;
2716
2717         if (!ops || ops->currcon < 0)
2718                 return;
2719
2720         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2721                 vc = vc_cons[i].d;
2722                 if (!vc || vc->vc_mode != KD_TEXT ||
2723                     fbcon_info_from_console(i) != info)
2724                         continue;
2725
2726                 if (con_is_visible(vc)) {
2727                         fg = i;
2728                         continue;
2729                 }
2730
2731                 p = &fb_display[vc->vc_num];
2732                 set_blitting_type(vc, info);
2733                 var_to_display(p, &info->var, info);
2734                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2735                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2736                 cols /= vc->vc_font.width;
2737                 rows /= vc->vc_font.height;
2738                 vc_resize(vc, cols, rows);
2739         }
2740
2741         if (fg != -1)
2742                 fbcon_modechanged(info);
2743 }
2744
2745
2746 void fbcon_update_vcs(struct fb_info *info, bool all)
2747 {
2748         if (all)
2749                 fbcon_set_all_vcs(info);
2750         else
2751                 fbcon_modechanged(info);
2752 }
2753 EXPORT_SYMBOL(fbcon_update_vcs);
2754
2755 /* let fbcon check if it supports a new screen resolution */
2756 int fbcon_modechange_possible(struct fb_info *info, struct fb_var_screeninfo *var)
2757 {
2758         struct fbcon_ops *ops = info->fbcon_par;
2759         struct vc_data *vc;
2760         unsigned int i;
2761
2762         WARN_CONSOLE_UNLOCKED();
2763
2764         if (!ops)
2765                 return 0;
2766
2767         /* prevent setting a screen size which is smaller than font size */
2768         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2769                 vc = vc_cons[i].d;
2770                 if (!vc || vc->vc_mode != KD_TEXT ||
2771                            fbcon_info_from_console(i) != info)
2772                         continue;
2773
2774                 if (vc->vc_font.width  > FBCON_SWAP(var->rotate, var->xres, var->yres) ||
2775                     vc->vc_font.height > FBCON_SWAP(var->rotate, var->yres, var->xres))
2776                         return -EINVAL;
2777         }
2778
2779         return 0;
2780 }
2781 EXPORT_SYMBOL_GPL(fbcon_modechange_possible);
2782
2783 int fbcon_mode_deleted(struct fb_info *info,
2784                        struct fb_videomode *mode)
2785 {
2786         struct fb_info *fb_info;
2787         struct fbcon_display *p;
2788         int i, j, found = 0;
2789
2790         /* before deletion, ensure that mode is not in use */
2791         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2792                 j = con2fb_map[i];
2793                 if (j == -1)
2794                         continue;
2795                 fb_info = fbcon_registered_fb[j];
2796                 if (fb_info != info)
2797                         continue;
2798                 p = &fb_display[i];
2799                 if (!p || !p->mode)
2800                         continue;
2801                 if (fb_mode_is_equal(p->mode, mode)) {
2802                         found = 1;
2803                         break;
2804                 }
2805         }
2806         return found;
2807 }
2808
2809 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2810 static void fbcon_unbind(void)
2811 {
2812         int ret;
2813
2814         ret = do_unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
2815                                 fbcon_is_default);
2816
2817         if (!ret)
2818                 fbcon_has_console_bind = 0;
2819 }
2820 #else
2821 static inline void fbcon_unbind(void) {}
2822 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
2823
2824 void fbcon_fb_unbind(struct fb_info *info)
2825 {
2826         int i, new_idx = -1;
2827         int idx = info->node;
2828
2829         console_lock();
2830
2831         if (!fbcon_has_console_bind) {
2832                 console_unlock();
2833                 return;
2834         }
2835
2836         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2837                 if (con2fb_map[i] != idx &&
2838                     con2fb_map[i] != -1) {
2839                         new_idx = con2fb_map[i];
2840                         break;
2841                 }
2842         }
2843
2844         if (new_idx != -1) {
2845                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2846                         if (con2fb_map[i] == idx)
2847                                 set_con2fb_map(i, new_idx, 0);
2848                 }
2849         } else {
2850                 struct fb_info *info = fbcon_registered_fb[idx];
2851
2852                 /* This is sort of like set_con2fb_map, except it maps
2853                  * the consoles to no device and then releases the
2854                  * oldinfo to free memory and cancel the cursor blink
2855                  * timer. I can imagine this just becoming part of
2856                  * set_con2fb_map where new_idx is -1
2857                  */
2858                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2859                         if (con2fb_map[i] == idx) {
2860                                 con2fb_map[i] = -1;
2861                                 if (!search_fb_in_map(idx)) {
2862                                         con2fb_release_oldinfo(vc_cons[i].d,
2863                                                                info, NULL);
2864                                 }
2865                         }
2866                 }
2867                 fbcon_unbind();
2868         }
2869
2870         console_unlock();
2871 }
2872
2873 void fbcon_fb_unregistered(struct fb_info *info)
2874 {
2875         int i, idx;
2876
2877         console_lock();
2878
2879         fbcon_registered_fb[info->node] = NULL;
2880         fbcon_num_registered_fb--;
2881
2882         if (deferred_takeover) {
2883                 console_unlock();
2884                 return;
2885         }
2886
2887         idx = info->node;
2888         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2889                 if (con2fb_map[i] == idx)
2890                         con2fb_map[i] = -1;
2891         }
2892
2893         if (idx == info_idx) {
2894                 info_idx = -1;
2895
2896                 fbcon_for_each_registered_fb(i) {
2897                         info_idx = i;
2898                         break;
2899                 }
2900         }
2901
2902         if (info_idx != -1) {
2903                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2904                         if (con2fb_map[i] == -1)
2905                                 con2fb_map[i] = info_idx;
2906                 }
2907         }
2908
2909         if (primary_device == idx)
2910                 primary_device = -1;
2911
2912         if (!fbcon_num_registered_fb)
2913                 do_unregister_con_driver(&fb_con);
2914         console_unlock();
2915 }
2916
2917 void fbcon_remap_all(struct fb_info *info)
2918 {
2919         int i, idx = info->node;
2920
2921         console_lock();
2922         if (deferred_takeover) {
2923                 for (i = first_fb_vc; i <= last_fb_vc; i++)
2924                         con2fb_map_boot[i] = idx;
2925                 fbcon_map_override();
2926                 console_unlock();
2927                 return;
2928         }
2929
2930         for (i = first_fb_vc; i <= last_fb_vc; i++)
2931                 set_con2fb_map(i, idx, 0);
2932
2933         if (con_is_bound(&fb_con)) {
2934                 printk(KERN_INFO "fbcon: Remapping primary device, "
2935                        "fb%i, to tty %i-%i\n", idx,
2936                        first_fb_vc + 1, last_fb_vc + 1);
2937                 info_idx = idx;
2938         }
2939         console_unlock();
2940 }
2941
2942 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
2943 static void fbcon_select_primary(struct fb_info *info)
2944 {
2945         if (!map_override && primary_device == -1 &&
2946             fb_is_primary_device(info)) {
2947                 int i;
2948
2949                 printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
2950                        info->fix.id, info->node);
2951                 primary_device = info->node;
2952
2953                 for (i = first_fb_vc; i <= last_fb_vc; i++)
2954                         con2fb_map_boot[i] = primary_device;
2955
2956                 if (con_is_bound(&fb_con)) {
2957                         printk(KERN_INFO "fbcon: Remapping primary device, "
2958                                "fb%i, to tty %i-%i\n", info->node,
2959                                first_fb_vc + 1, last_fb_vc + 1);
2960                         info_idx = primary_device;
2961                 }
2962         }
2963
2964 }
2965 #else
2966 static inline void fbcon_select_primary(struct fb_info *info)
2967 {
2968         return;
2969 }
2970 #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
2971
2972 static bool lockless_register_fb;
2973 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
2974 MODULE_PARM_DESC(lockless_register_fb,
2975         "Lockless framebuffer registration for debugging [default=off]");
2976
2977 /* called with console_lock held */
2978 static int do_fb_registered(struct fb_info *info)
2979 {
2980         int ret = 0, i, idx;
2981
2982         WARN_CONSOLE_UNLOCKED();
2983
2984         fbcon_registered_fb[info->node] = info;
2985         fbcon_num_registered_fb++;
2986
2987         idx = info->node;
2988         fbcon_select_primary(info);
2989
2990         if (deferred_takeover) {
2991                 pr_info("fbcon: Deferring console take-over\n");
2992                 return 0;
2993         }
2994
2995         if (info_idx == -1) {
2996                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2997                         if (con2fb_map_boot[i] == idx) {
2998                                 info_idx = idx;
2999                                 break;
3000                         }
3001                 }
3002
3003                 if (info_idx != -1)
3004                         ret = do_fbcon_takeover(1);
3005         } else {
3006                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3007                         if (con2fb_map_boot[i] == idx)
3008                                 set_con2fb_map(i, idx, 0);
3009                 }
3010         }
3011
3012         return ret;
3013 }
3014
3015 int fbcon_fb_registered(struct fb_info *info)
3016 {
3017         int ret;
3018
3019         if (!lockless_register_fb)
3020                 console_lock();
3021         else
3022                 atomic_inc(&ignore_console_lock_warning);
3023
3024         ret = do_fb_registered(info);
3025
3026         if (!lockless_register_fb)
3027                 console_unlock();
3028         else
3029                 atomic_dec(&ignore_console_lock_warning);
3030
3031         return ret;
3032 }
3033
3034 void fbcon_fb_blanked(struct fb_info *info, int blank)
3035 {
3036         struct fbcon_ops *ops = info->fbcon_par;
3037         struct vc_data *vc;
3038
3039         if (!ops || ops->currcon < 0)
3040                 return;
3041
3042         vc = vc_cons[ops->currcon].d;
3043         if (vc->vc_mode != KD_TEXT ||
3044                         fbcon_info_from_console(ops->currcon) != info)
3045                 return;
3046
3047         if (con_is_visible(vc)) {
3048                 if (blank)
3049                         do_blank_screen(0);
3050                 else
3051                         do_unblank_screen(0);
3052         }
3053         ops->blank_state = blank;
3054 }
3055
3056 void fbcon_new_modelist(struct fb_info *info)
3057 {
3058         int i;
3059         struct vc_data *vc;
3060         struct fb_var_screeninfo var;
3061         const struct fb_videomode *mode;
3062
3063         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3064                 if (fbcon_info_from_console(i) != info)
3065                         continue;
3066                 if (!fb_display[i].mode)
3067                         continue;
3068                 vc = vc_cons[i].d;
3069                 display_to_var(&var, &fb_display[i]);
3070                 mode = fb_find_nearest_mode(fb_display[i].mode,
3071                                             &info->modelist);
3072                 fb_videomode_to_var(&var, mode);
3073                 fbcon_set_disp(info, &var, vc->vc_num);
3074         }
3075 }
3076
3077 void fbcon_get_requirement(struct fb_info *info,
3078                            struct fb_blit_caps *caps)
3079 {
3080         struct vc_data *vc;
3081
3082         if (caps->flags) {
3083                 int i, charcnt;
3084
3085                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3086                         vc = vc_cons[i].d;
3087                         if (vc && vc->vc_mode == KD_TEXT &&
3088                             info->node == con2fb_map[i]) {
3089                                 caps->x |= 1 << (vc->vc_font.width - 1);
3090                                 caps->y |= 1 << (vc->vc_font.height - 1);
3091                                 charcnt = vc->vc_font.charcount;
3092                                 if (caps->len < charcnt)
3093                                         caps->len = charcnt;
3094                         }
3095                 }
3096         } else {
3097                 vc = vc_cons[fg_console].d;
3098
3099                 if (vc && vc->vc_mode == KD_TEXT &&
3100                     info->node == con2fb_map[fg_console]) {
3101                         caps->x = 1 << (vc->vc_font.width - 1);
3102                         caps->y = 1 << (vc->vc_font.height - 1);
3103                         caps->len = vc->vc_font.charcount;
3104                 }
3105         }
3106 }
3107
3108 int fbcon_set_con2fb_map_ioctl(void __user *argp)
3109 {
3110         struct fb_con2fbmap con2fb;
3111         int ret;
3112
3113         if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
3114                 return -EFAULT;
3115         if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
3116                 return -EINVAL;
3117         if (con2fb.framebuffer >= FB_MAX)
3118                 return -EINVAL;
3119         if (!fbcon_registered_fb[con2fb.framebuffer])
3120                 request_module("fb%d", con2fb.framebuffer);
3121         if (!fbcon_registered_fb[con2fb.framebuffer]) {
3122                 return -EINVAL;
3123         }
3124
3125         console_lock();
3126         ret = set_con2fb_map(con2fb.console - 1,
3127                              con2fb.framebuffer, 1);
3128         console_unlock();
3129
3130         return ret;
3131 }
3132
3133 int fbcon_get_con2fb_map_ioctl(void __user *argp)
3134 {
3135         struct fb_con2fbmap con2fb;
3136
3137         if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
3138                 return -EFAULT;
3139         if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
3140                 return -EINVAL;
3141
3142         console_lock();
3143         con2fb.framebuffer = con2fb_map[con2fb.console - 1];
3144         console_unlock();
3145
3146         return copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
3147 }
3148
3149 /*
3150  *  The console `switch' structure for the frame buffer based console
3151  */
3152
3153 static const struct consw fb_con = {
3154         .owner                  = THIS_MODULE,
3155         .con_startup            = fbcon_startup,
3156         .con_init               = fbcon_init,
3157         .con_deinit             = fbcon_deinit,
3158         .con_clear              = fbcon_clear,
3159         .con_putc               = fbcon_putc,
3160         .con_putcs              = fbcon_putcs,
3161         .con_cursor             = fbcon_cursor,
3162         .con_scroll             = fbcon_scroll,
3163         .con_switch             = fbcon_switch,
3164         .con_blank              = fbcon_blank,
3165         .con_font_set           = fbcon_set_font,
3166         .con_font_get           = fbcon_get_font,
3167         .con_font_default       = fbcon_set_def_font,
3168         .con_set_palette        = fbcon_set_palette,
3169         .con_invert_region      = fbcon_invert_region,
3170         .con_screen_pos         = fbcon_screen_pos,
3171         .con_getxy              = fbcon_getxy,
3172         .con_resize             = fbcon_resize,
3173         .con_debug_enter        = fbcon_debug_enter,
3174         .con_debug_leave        = fbcon_debug_leave,
3175 };
3176
3177 static ssize_t store_rotate(struct device *device,
3178                             struct device_attribute *attr, const char *buf,
3179                             size_t count)
3180 {
3181         struct fb_info *info;
3182         int rotate, idx;
3183         char **last = NULL;
3184
3185         console_lock();
3186         idx = con2fb_map[fg_console];
3187
3188         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3189                 goto err;
3190
3191         info = fbcon_registered_fb[idx];
3192         rotate = simple_strtoul(buf, last, 0);
3193         fbcon_rotate(info, rotate);
3194 err:
3195         console_unlock();
3196         return count;
3197 }
3198
3199 static ssize_t store_rotate_all(struct device *device,
3200                                 struct device_attribute *attr,const char *buf,
3201                                 size_t count)
3202 {
3203         struct fb_info *info;
3204         int rotate, idx;
3205         char **last = NULL;
3206
3207         console_lock();
3208         idx = con2fb_map[fg_console];
3209
3210         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3211                 goto err;
3212
3213         info = fbcon_registered_fb[idx];
3214         rotate = simple_strtoul(buf, last, 0);
3215         fbcon_rotate_all(info, rotate);
3216 err:
3217         console_unlock();
3218         return count;
3219 }
3220
3221 static ssize_t show_rotate(struct device *device,
3222                            struct device_attribute *attr,char *buf)
3223 {
3224         struct fb_info *info;
3225         int rotate = 0, idx;
3226
3227         console_lock();
3228         idx = con2fb_map[fg_console];
3229
3230         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3231                 goto err;
3232
3233         info = fbcon_registered_fb[idx];
3234         rotate = fbcon_get_rotate(info);
3235 err:
3236         console_unlock();
3237         return sysfs_emit(buf, "%d\n", rotate);
3238 }
3239
3240 static ssize_t show_cursor_blink(struct device *device,
3241                                  struct device_attribute *attr, char *buf)
3242 {
3243         struct fb_info *info;
3244         struct fbcon_ops *ops;
3245         int idx, blink = -1;
3246
3247         console_lock();
3248         idx = con2fb_map[fg_console];
3249
3250         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3251                 goto err;
3252
3253         info = fbcon_registered_fb[idx];
3254         ops = info->fbcon_par;
3255
3256         if (!ops)
3257                 goto err;
3258
3259         blink = delayed_work_pending(&ops->cursor_work);
3260 err:
3261         console_unlock();
3262         return sysfs_emit(buf, "%d\n", blink);
3263 }
3264
3265 static ssize_t store_cursor_blink(struct device *device,
3266                                   struct device_attribute *attr,
3267                                   const char *buf, size_t count)
3268 {
3269         struct fb_info *info;
3270         int blink, idx;
3271         char **last = NULL;
3272
3273         console_lock();
3274         idx = con2fb_map[fg_console];
3275
3276         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3277                 goto err;
3278
3279         info = fbcon_registered_fb[idx];
3280
3281         if (!info->fbcon_par)
3282                 goto err;
3283
3284         blink = simple_strtoul(buf, last, 0);
3285
3286         if (blink) {
3287                 fbcon_cursor_noblink = 0;
3288                 fbcon_add_cursor_work(info);
3289         } else {
3290                 fbcon_cursor_noblink = 1;
3291                 fbcon_del_cursor_work(info);
3292         }
3293
3294 err:
3295         console_unlock();
3296         return count;
3297 }
3298
3299 static struct device_attribute device_attrs[] = {
3300         __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
3301         __ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
3302         __ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
3303                store_cursor_blink),
3304 };
3305
3306 static int fbcon_init_device(void)
3307 {
3308         int i, error = 0;
3309
3310         fbcon_has_sysfs = 1;
3311
3312         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3313                 error = device_create_file(fbcon_device, &device_attrs[i]);
3314
3315                 if (error)
3316                         break;
3317         }
3318
3319         if (error) {
3320                 while (--i >= 0)
3321                         device_remove_file(fbcon_device, &device_attrs[i]);
3322
3323                 fbcon_has_sysfs = 0;
3324         }
3325
3326         return 0;
3327 }
3328
3329 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
3330 static void fbcon_register_existing_fbs(struct work_struct *work)
3331 {
3332         int i;
3333
3334         console_lock();
3335
3336         deferred_takeover = false;
3337         logo_shown = FBCON_LOGO_DONTSHOW;
3338
3339         fbcon_for_each_registered_fb(i)
3340                 do_fb_registered(fbcon_registered_fb[i]);
3341
3342         console_unlock();
3343 }
3344
3345 static struct notifier_block fbcon_output_nb;
3346 static DECLARE_WORK(fbcon_deferred_takeover_work, fbcon_register_existing_fbs);
3347
3348 static int fbcon_output_notifier(struct notifier_block *nb,
3349                                  unsigned long action, void *data)
3350 {
3351         WARN_CONSOLE_UNLOCKED();
3352
3353         pr_info("fbcon: Taking over console\n");
3354
3355         dummycon_unregister_output_notifier(&fbcon_output_nb);
3356
3357         /* We may get called in atomic context */
3358         schedule_work(&fbcon_deferred_takeover_work);
3359
3360         return NOTIFY_OK;
3361 }
3362 #endif
3363
3364 static void fbcon_start(void)
3365 {
3366         WARN_CONSOLE_UNLOCKED();
3367
3368 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
3369         if (conswitchp != &dummy_con)
3370                 deferred_takeover = false;
3371
3372         if (deferred_takeover) {
3373                 fbcon_output_nb.notifier_call = fbcon_output_notifier;
3374                 dummycon_register_output_notifier(&fbcon_output_nb);
3375                 return;
3376         }
3377 #endif
3378 }
3379
3380 void __init fb_console_init(void)
3381 {
3382         int i;
3383
3384         console_lock();
3385         fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
3386                                      "fbcon");
3387
3388         if (IS_ERR(fbcon_device)) {
3389                 printk(KERN_WARNING "Unable to create device "
3390                        "for fbcon; errno = %ld\n",
3391                        PTR_ERR(fbcon_device));
3392                 fbcon_device = NULL;
3393         } else
3394                 fbcon_init_device();
3395
3396         for (i = 0; i < MAX_NR_CONSOLES; i++)
3397                 con2fb_map[i] = -1;
3398
3399         fbcon_start();
3400         console_unlock();
3401 }
3402
3403 #ifdef MODULE
3404
3405 static void __exit fbcon_deinit_device(void)
3406 {
3407         int i;
3408
3409         if (fbcon_has_sysfs) {
3410                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3411                         device_remove_file(fbcon_device, &device_attrs[i]);
3412
3413                 fbcon_has_sysfs = 0;
3414         }
3415 }
3416
3417 void __exit fb_console_exit(void)
3418 {
3419 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
3420         console_lock();
3421         if (deferred_takeover)
3422                 dummycon_unregister_output_notifier(&fbcon_output_nb);
3423         console_unlock();
3424
3425         cancel_work_sync(&fbcon_deferred_takeover_work);
3426 #endif
3427
3428         console_lock();
3429         fbcon_deinit_device();
3430         device_destroy(fb_class, MKDEV(0, 0));
3431
3432         do_unregister_con_driver(&fb_con);
3433         console_unlock();
3434 }
3435 #endif