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/irq.h>
  79
  80 #include "fbcon.h"
  81 #include "fb_internal.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 static struct fb_info *fbcon_registered_fb[FB_MAX];
 107 static 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         bool enable;
 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         enable = ops->cursor_flash && !ops->cursor_state.enable;
 379         ops->cursor(vc, info, enable, get_color(vc, info, c, 1),
 380                     get_color(vc, info, c, 0));
 381         console_unlock();
 382
 383         queue_delayed_work(system_power_efficient_wq, &ops->cursor_work,
 384                            ops->cur_blink_jiffies);
 385 }
 386
 387 static void fbcon_add_cursor_work(struct fb_info *info)
 388 {
 389         struct fbcon_ops *ops = info->fbcon_par;
 390
 391         if (!fbcon_cursor_noblink)
 392                 queue_delayed_work(system_power_efficient_wq, &ops->cursor_work,
 393                                    ops->cur_blink_jiffies);
 394 }
 395
 396 static void fbcon_del_cursor_work(struct fb_info *info)
 397 {
 398         struct fbcon_ops *ops = info->fbcon_par;
 399
 400         cancel_delayed_work_sync(&ops->cursor_work);
 401 }
 402
 403 #ifndef MODULE
 404 static int __init fb_console_setup(char *this_opt)
 405 {
 406         char *options;
 407         int i, j;
 408
 409         if (!this_opt || !*this_opt)
 410                 return 1;
 411
 412         while ((options = strsep(&this_opt, ",")) != NULL) {
 413                 if (!strncmp(options, "font:", 5)) {
 414                         strscpy(fontname, options + 5, sizeof(fontname));
 415                         continue;
 416                 }
 417
 418                 if (!strncmp(options, "scrollback:", 11)) {
 419                         pr_warn("Ignoring scrollback size option\n");
 420                         continue;
 421                 }
 422
 423                 if (!strncmp(options, "map:", 4)) {
 424                         options += 4;
 425                         if (*options) {
 426                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 427                                         if (!options[j])
 428                                                 j = 0;
 429                                         con2fb_map_boot[i] =
 430                                                 (options[j++]-'0') % FB_MAX;
 431                                 }
 432
 433                                 fbcon_map_override();
 434                         }
 435                         continue;
 436                 }
 437
 438                 if (!strncmp(options, "vc:", 3)) {
 439                         options += 3;
 440                         if (*options)
 441                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 442                         if (first_fb_vc >= MAX_NR_CONSOLES)
 443                                 first_fb_vc = 0;
 444                         if (*options++ == '-')
 445                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 446                         if (last_fb_vc < first_fb_vc || last_fb_vc >= MAX_NR_CONSOLES)
 447                                 last_fb_vc = MAX_NR_CONSOLES - 1;
 448                         fbcon_is_default = 0;
 449                         continue;
 450                 }
 451
 452                 if (!strncmp(options, "rotate:", 7)) {
 453                         options += 7;
 454                         if (*options)
 455                                 initial_rotation = simple_strtoul(options, &options, 0);
 456                         if (initial_rotation > 3)
 457                                 initial_rotation = 0;
 458                         continue;
 459                 }
 460
 461                 if (!strncmp(options, "margin:", 7)) {
 462                         options += 7;
 463                         if (*options)
 464                                 margin_color = simple_strtoul(options, &options, 0);
 465                         continue;
 466                 }
 467 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
 468                 if (!strcmp(options, "nodefer")) {
 469                         deferred_takeover = false;
 470                         continue;
 471                 }
 472 #endif
 473
 474 #ifdef CONFIG_LOGO
 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 #endif
 489         }
 490         return 1;
 491 }
 492
 493 __setup("fbcon=", fb_console_setup);
 494 #endif
 495
 496 static int search_fb_in_map(int idx)
 497 {
 498         int i, retval = 0;
 499
 500         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 501                 if (con2fb_map[i] == idx)
 502                         retval = 1;
 503         }
 504         return retval;
 505 }
 506
 507 static int search_for_mapped_con(void)
 508 {
 509         int i, retval = 0;
 510
 511         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 512                 if (con2fb_map[i] != -1)
 513                         retval = 1;
 514         }
 515         return retval;
 516 }
 517
 518 static int do_fbcon_takeover(int show_logo)
 519 {
 520         int err, i;
 521
 522         if (!fbcon_num_registered_fb)
 523                 return -ENODEV;
 524
 525         if (!show_logo)
 526                 logo_shown = FBCON_LOGO_DONTSHOW;
 527
 528         for (i = first_fb_vc; i <= last_fb_vc; i++)
 529                 con2fb_map[i] = info_idx;
 530
 531         err = do_take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 532                                 fbcon_is_default);
 533
 534         if (err) {
 535                 for (i = first_fb_vc; i <= last_fb_vc; i++)
 536                         con2fb_map[i] = -1;
 537                 info_idx = -1;
 538         } else {
 539                 fbcon_has_console_bind = 1;
 540         }
 541
 542         return err;
 543 }
 544
 545 #ifdef MODULE
 546 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 547                                int cols, int rows, int new_cols, int new_rows)
 548 {
 549         logo_shown = FBCON_LOGO_DONTSHOW;
 550 }
 551 #else
 552 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 553                                int cols, int rows, int new_cols, int new_rows)
 554 {
 555         /* Need to make room for the logo */
 556         struct fbcon_ops *ops = info->fbcon_par;
 557         int cnt, erase = vc->vc_video_erase_char, step;
 558         unsigned short *save = NULL, *r, *q;
 559         int logo_height;
 560
 561         if (info->fbops->owner) {
 562                 logo_shown = FBCON_LOGO_DONTSHOW;
 563                 return;
 564         }
 565
 566         /*
 567          * remove underline attribute from erase character
 568          * if black and white framebuffer.
 569          */
 570         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 571                 erase &= ~0x400;
 572         logo_height = fb_prepare_logo(info, ops->rotate);
 573         logo_lines = DIV_ROUND_UP(logo_height, vc->vc_font.height);
 574         q = (unsigned short *) (vc->vc_origin +
 575                                 vc->vc_size_row * rows);
 576         step = logo_lines * cols;
 577         for (r = q - logo_lines * cols; r < q; r++)
 578                 if (scr_readw(r) != vc->vc_video_erase_char)
 579                         break;
 580         if (r != q && new_rows >= rows + logo_lines) {
 581                 save = kmalloc(array3_size(logo_lines, new_cols, 2),
 582                                GFP_KERNEL);
 583                 if (save) {
 584                         int i = min(cols, new_cols);
 585                         scr_memsetw(save, erase, array3_size(logo_lines, new_cols, 2));
 586                         r = q - step;
 587                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 588                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 589                         r = q;
 590                 }
 591         }
 592         if (r == q) {
 593                 /* We can scroll screen down */
 594                 r = q - step - cols;
 595                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 596                         scr_memcpyw(r + step, r, vc->vc_size_row);
 597                         r -= cols;
 598                 }
 599                 if (!save) {
 600                         int lines;
 601                         if (vc->state.y + logo_lines >= rows)
 602                                 lines = rows - vc->state.y - 1;
 603                         else
 604                                 lines = logo_lines;
 605                         vc->state.y += lines;
 606                         vc->vc_pos += lines * vc->vc_size_row;
 607                 }
 608         }
 609         scr_memsetw((unsigned short *) vc->vc_origin,
 610                     erase,
 611                     vc->vc_size_row * logo_lines);
 612
 613         if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
 614                 fbcon_clear_margins(vc, 0);
 615                 update_screen(vc);
 616         }
 617
 618         if (save) {
 619                 q = (unsigned short *) (vc->vc_origin +
 620                                         vc->vc_size_row *
 621                                         rows);
 622                 scr_memcpyw(q, save, array3_size(logo_lines, new_cols, 2));
 623                 vc->state.y += logo_lines;
 624                 vc->vc_pos += logo_lines * vc->vc_size_row;
 625                 kfree(save);
 626         }
 627
 628         if (logo_shown == FBCON_LOGO_DONTSHOW)
 629                 return;
 630
 631         if (logo_lines > vc->vc_bottom) {
 632                 logo_shown = FBCON_LOGO_CANSHOW;
 633                 pr_info("fbcon: 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 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         if (!search_fb_in_map(newidx)) {
 845                 err = con2fb_acquire_newinfo(vc, info, unit);
 846                 if (err)
 847                         return err;
 848
 849                 fbcon_add_cursor_work(info);
 850         }
 851
 852         con2fb_map[unit] = newidx;
 853
 854         /*
 855          * If old fb is not mapped to any of the consoles,
 856          * fbcon should release it.
 857          */
 858         if (oldinfo && !search_fb_in_map(oldidx))
 859                 con2fb_release_oldinfo(vc, oldinfo, info);
 860
 861         show_logo = (fg_console == 0 && !user &&
 862                          logo_shown != FBCON_LOGO_DONTSHOW);
 863
 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         static 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, bool 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, unsigned int sy, unsigned int sx,
1237                           unsigned int height, unsigned 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_clear(struct vc_data *vc, unsigned int sy, unsigned int sx,
1275                         unsigned int width)
1276 {
1277         __fbcon_clear(vc, sy, sx, 1, width);
1278 }
1279
1280 static void fbcon_putcs(struct vc_data *vc, const u16 *s, unsigned int count,
1281                         unsigned int ypos, unsigned int xpos)
1282 {
1283         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1284         struct fbcon_display *p = &fb_display[vc->vc_num];
1285         struct fbcon_ops *ops = info->fbcon_par;
1286
1287         if (!fbcon_is_inactive(vc, info))
1288                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1289                            get_color(vc, info, scr_readw(s), 1),
1290                            get_color(vc, info, scr_readw(s), 0));
1291 }
1292
1293 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1294 {
1295         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1296         struct fbcon_ops *ops = info->fbcon_par;
1297
1298         if (!fbcon_is_inactive(vc, info))
1299                 ops->clear_margins(vc, info, margin_color, bottom_only);
1300 }
1301
1302 static void fbcon_cursor(struct vc_data *vc, bool enable)
1303 {
1304         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1305         struct fbcon_ops *ops = info->fbcon_par;
1306         int c = scr_readw((u16 *) vc->vc_pos);
1307
1308         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1309
1310         if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
1311                 return;
1312
1313         if (vc->vc_cursor_type & CUR_SW)
1314                 fbcon_del_cursor_work(info);
1315         else
1316                 fbcon_add_cursor_work(info);
1317
1318         ops->cursor_flash = enable;
1319
1320         if (!ops->cursor)
1321                 return;
1322
1323         ops->cursor(vc, info, enable, get_color(vc, info, c, 1),
1324                     get_color(vc, info, c, 0));
1325 }
1326
1327 static int scrollback_phys_max = 0;
1328 static int scrollback_max = 0;
1329 static int scrollback_current = 0;
1330
1331 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1332                            int unit)
1333 {
1334         struct fbcon_display *p, *t;
1335         struct vc_data **default_mode, *vc;
1336         struct vc_data *svc;
1337         struct fbcon_ops *ops = info->fbcon_par;
1338         int rows, cols;
1339
1340         p = &fb_display[unit];
1341
1342         if (var_to_display(p, var, info))
1343                 return;
1344
1345         vc = vc_cons[unit].d;
1346
1347         if (!vc)
1348                 return;
1349
1350         default_mode = vc->vc_display_fg;
1351         svc = *default_mode;
1352         t = &fb_display[svc->vc_num];
1353
1354         if (!vc->vc_font.data) {
1355                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1356                 vc->vc_font.width = (*default_mode)->vc_font.width;
1357                 vc->vc_font.height = (*default_mode)->vc_font.height;
1358                 vc->vc_font.charcount = (*default_mode)->vc_font.charcount;
1359                 p->userfont = t->userfont;
1360                 if (p->userfont)
1361                         REFCOUNT(p->fontdata)++;
1362         }
1363
1364         var->activate = FB_ACTIVATE_NOW;
1365         info->var.activate = var->activate;
1366         var->yoffset = info->var.yoffset;
1367         var->xoffset = info->var.xoffset;
1368         fb_set_var(info, var);
1369         ops->var = info->var;
1370         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1371         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1372         if (vc->vc_font.charcount == 256) {
1373                 vc->vc_hi_font_mask = 0;
1374         } else {
1375                 vc->vc_hi_font_mask = 0x100;
1376                 if (vc->vc_can_do_color)
1377                         vc->vc_complement_mask <<= 1;
1378         }
1379
1380         if (!*svc->uni_pagedict_loc)
1381                 con_set_default_unimap(svc);
1382         if (!*vc->uni_pagedict_loc)
1383                 con_copy_unimap(vc, svc);
1384
1385         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1386         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1387         cols /= vc->vc_font.width;
1388         rows /= vc->vc_font.height;
1389         vc_resize(vc, cols, rows);
1390
1391         if (con_is_visible(vc)) {
1392                 update_screen(vc);
1393         }
1394 }
1395
1396 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1397 {
1398         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1399         struct fbcon_ops *ops = info->fbcon_par;
1400         struct fbcon_display *p = &fb_display[vc->vc_num];
1401
1402         p->yscroll += count;
1403         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1404                 p->yscroll -= p->vrows;
1405         ops->var.xoffset = 0;
1406         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1407         ops->var.vmode |= FB_VMODE_YWRAP;
1408         ops->update_start(info);
1409         scrollback_max += count;
1410         if (scrollback_max > scrollback_phys_max)
1411                 scrollback_max = scrollback_phys_max;
1412         scrollback_current = 0;
1413 }
1414
1415 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1416 {
1417         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1418         struct fbcon_ops *ops = info->fbcon_par;
1419         struct fbcon_display *p = &fb_display[vc->vc_num];
1420
1421         p->yscroll -= count;
1422         if (p->yscroll < 0)     /* Deal with wrap */
1423                 p->yscroll += p->vrows;
1424         ops->var.xoffset = 0;
1425         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1426         ops->var.vmode |= FB_VMODE_YWRAP;
1427         ops->update_start(info);
1428         scrollback_max -= count;
1429         if (scrollback_max < 0)
1430                 scrollback_max = 0;
1431         scrollback_current = 0;
1432 }
1433
1434 static __inline__ void ypan_up(struct vc_data *vc, int count)
1435 {
1436         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1437         struct fbcon_display *p = &fb_display[vc->vc_num];
1438         struct fbcon_ops *ops = info->fbcon_par;
1439
1440         p->yscroll += count;
1441         if (p->yscroll > p->vrows - vc->vc_rows) {
1442                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1443                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1444                 p->yscroll -= p->vrows - vc->vc_rows;
1445         }
1446
1447         ops->var.xoffset = 0;
1448         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1449         ops->var.vmode &= ~FB_VMODE_YWRAP;
1450         ops->update_start(info);
1451         fbcon_clear_margins(vc, 1);
1452         scrollback_max += count;
1453         if (scrollback_max > scrollback_phys_max)
1454                 scrollback_max = scrollback_phys_max;
1455         scrollback_current = 0;
1456 }
1457
1458 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1459 {
1460         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1461         struct fbcon_ops *ops = info->fbcon_par;
1462         struct fbcon_display *p = &fb_display[vc->vc_num];
1463
1464         p->yscroll += count;
1465
1466         if (p->yscroll > p->vrows - vc->vc_rows) {
1467                 p->yscroll -= p->vrows - vc->vc_rows;
1468                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1469         }
1470
1471         ops->var.xoffset = 0;
1472         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1473         ops->var.vmode &= ~FB_VMODE_YWRAP;
1474         ops->update_start(info);
1475         fbcon_clear_margins(vc, 1);
1476         scrollback_max += count;
1477         if (scrollback_max > scrollback_phys_max)
1478                 scrollback_max = scrollback_phys_max;
1479         scrollback_current = 0;
1480 }
1481
1482 static __inline__ void ypan_down(struct vc_data *vc, int count)
1483 {
1484         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1485         struct fbcon_display *p = &fb_display[vc->vc_num];
1486         struct fbcon_ops *ops = info->fbcon_par;
1487
1488         p->yscroll -= count;
1489         if (p->yscroll < 0) {
1490                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1491                             0, vc->vc_rows, vc->vc_cols);
1492                 p->yscroll += p->vrows - vc->vc_rows;
1493         }
1494
1495         ops->var.xoffset = 0;
1496         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1497         ops->var.vmode &= ~FB_VMODE_YWRAP;
1498         ops->update_start(info);
1499         fbcon_clear_margins(vc, 1);
1500         scrollback_max -= count;
1501         if (scrollback_max < 0)
1502                 scrollback_max = 0;
1503         scrollback_current = 0;
1504 }
1505
1506 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1507 {
1508         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1509         struct fbcon_ops *ops = info->fbcon_par;
1510         struct fbcon_display *p = &fb_display[vc->vc_num];
1511
1512         p->yscroll -= count;
1513
1514         if (p->yscroll < 0) {
1515                 p->yscroll += p->vrows - vc->vc_rows;
1516                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1517         }
1518
1519         ops->var.xoffset = 0;
1520         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1521         ops->var.vmode &= ~FB_VMODE_YWRAP;
1522         ops->update_start(info);
1523         fbcon_clear_margins(vc, 1);
1524         scrollback_max -= count;
1525         if (scrollback_max < 0)
1526                 scrollback_max = 0;
1527         scrollback_current = 0;
1528 }
1529
1530 static void fbcon_redraw_move(struct vc_data *vc, struct fbcon_display *p,
1531                               int line, int count, int dy)
1532 {
1533         unsigned short *s = (unsigned short *)
1534                 (vc->vc_origin + vc->vc_size_row * line);
1535
1536         while (count--) {
1537                 unsigned short *start = s;
1538                 unsigned short *le = advance_row(s, 1);
1539                 unsigned short c;
1540                 int x = 0;
1541                 unsigned short attr = 1;
1542
1543                 do {
1544                         c = scr_readw(s);
1545                         if (attr != (c & 0xff00)) {
1546                                 attr = c & 0xff00;
1547                                 if (s > start) {
1548                                         fbcon_putcs(vc, start, s - start,
1549                                                     dy, x);
1550                                         x += s - start;
1551                                         start = s;
1552                                 }
1553                         }
1554                         console_conditional_schedule();
1555                         s++;
1556                 } while (s < le);
1557                 if (s > start)
1558                         fbcon_putcs(vc, start, s - start, dy, x);
1559                 console_conditional_schedule();
1560                 dy++;
1561         }
1562 }
1563
1564 static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
1565                         struct fbcon_display *p, int line, int count, int ycount)
1566 {
1567         int offset = ycount * vc->vc_cols;
1568         unsigned short *d = (unsigned short *)
1569             (vc->vc_origin + vc->vc_size_row * line);
1570         unsigned short *s = d + offset;
1571         struct fbcon_ops *ops = info->fbcon_par;
1572
1573         while (count--) {
1574                 unsigned short *start = s;
1575                 unsigned short *le = advance_row(s, 1);
1576                 unsigned short c;
1577                 int x = 0;
1578
1579                 do {
1580                         c = scr_readw(s);
1581
1582                         if (c == scr_readw(d)) {
1583                                 if (s > start) {
1584                                         ops->bmove(vc, info, line + ycount, x,
1585                                                    line, x, 1, s-start);
1586                                         x += s - start + 1;
1587                                         start = s + 1;
1588                                 } else {
1589                                         x++;
1590                                         start++;
1591                                 }
1592                         }
1593
1594                         scr_writew(c, d);
1595                         console_conditional_schedule();
1596                         s++;
1597                         d++;
1598                 } while (s < le);
1599                 if (s > start)
1600                         ops->bmove(vc, info, line + ycount, x, line, x, 1,
1601                                    s-start);
1602                 console_conditional_schedule();
1603                 if (ycount > 0)
1604                         line++;
1605                 else {
1606                         line--;
1607                         /* NOTE: We subtract two lines from these pointers */
1608                         s -= vc->vc_size_row;
1609                         d -= vc->vc_size_row;
1610                 }
1611         }
1612 }
1613
1614 static void fbcon_redraw(struct vc_data *vc, int line, int count, int offset)
1615 {
1616         unsigned short *d = (unsigned short *)
1617             (vc->vc_origin + vc->vc_size_row * line);
1618         unsigned short *s = d + offset;
1619
1620         while (count--) {
1621                 unsigned short *start = s;
1622                 unsigned short *le = advance_row(s, 1);
1623                 unsigned short c;
1624                 int x = 0;
1625                 unsigned short attr = 1;
1626
1627                 do {
1628                         c = scr_readw(s);
1629                         if (attr != (c & 0xff00)) {
1630                                 attr = c & 0xff00;
1631                                 if (s > start) {
1632                                         fbcon_putcs(vc, start, s - start,
1633                                                     line, x);
1634                                         x += s - start;
1635                                         start = s;
1636                                 }
1637                         }
1638                         if (c == scr_readw(d)) {
1639                                 if (s > start) {
1640                                         fbcon_putcs(vc, start, s - start,
1641                                                      line, x);
1642                                         x += s - start + 1;
1643                                         start = s + 1;
1644                                 } else {
1645                                         x++;
1646                                         start++;
1647                                 }
1648                         }
1649                         scr_writew(c, d);
1650                         console_conditional_schedule();
1651                         s++;
1652                         d++;
1653                 } while (s < le);
1654                 if (s > start)
1655                         fbcon_putcs(vc, start, s - start, line, x);
1656                 console_conditional_schedule();
1657                 if (offset > 0)
1658                         line++;
1659                 else {
1660                         line--;
1661                         /* NOTE: We subtract two lines from these pointers */
1662                         s -= vc->vc_size_row;
1663                         d -= vc->vc_size_row;
1664                 }
1665         }
1666 }
1667
1668 static void fbcon_bmove_rec(struct vc_data *vc, struct fbcon_display *p, int sy, int sx,
1669                             int dy, int dx, int height, int width, u_int y_break)
1670 {
1671         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1672         struct fbcon_ops *ops = info->fbcon_par;
1673         u_int b;
1674
1675         if (sy < y_break && sy + height > y_break) {
1676                 b = y_break - sy;
1677                 if (dy < sy) {  /* Avoid trashing self */
1678                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1679                                         y_break);
1680                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1681                                         height - b, width, y_break);
1682                 } else {
1683                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1684                                         height - b, width, y_break);
1685                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1686                                         y_break);
1687                 }
1688                 return;
1689         }
1690
1691         if (dy < y_break && dy + height > y_break) {
1692                 b = y_break - dy;
1693                 if (dy < sy) {  /* Avoid trashing self */
1694                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1695                                         y_break);
1696                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1697                                         height - b, width, y_break);
1698                 } else {
1699                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1700                                         height - b, width, y_break);
1701                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1702                                         y_break);
1703                 }
1704                 return;
1705         }
1706         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1707                    height, width);
1708 }
1709
1710 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1711                         int height, int width)
1712 {
1713         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1714         struct fbcon_display *p = &fb_display[vc->vc_num];
1715
1716         if (fbcon_is_inactive(vc, info))
1717                 return;
1718
1719         if (!width || !height)
1720                 return;
1721
1722         /*  Split blits that cross physical y_wrap case.
1723          *  Pathological case involves 4 blits, better to use recursive
1724          *  code rather than unrolled case
1725          *
1726          *  Recursive invocations don't need to erase the cursor over and
1727          *  over again, so we use fbcon_bmove_rec()
1728          */
1729         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1730                         p->vrows - p->yscroll);
1731 }
1732
1733 static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
1734                 enum con_scroll dir, unsigned int count)
1735 {
1736         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1737         struct fbcon_display *p = &fb_display[vc->vc_num];
1738         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1739
1740         if (fbcon_is_inactive(vc, info))
1741                 return true;
1742
1743         fbcon_cursor(vc, false);
1744
1745         /*
1746          * ++Geert: Only use ywrap/ypan if the console is in text mode
1747          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1748          *           whole screen (prevents flicker).
1749          */
1750
1751         switch (dir) {
1752         case SM_UP:
1753                 if (count > vc->vc_rows)        /* Maximum realistic size */
1754                         count = vc->vc_rows;
1755                 switch (fb_scrollmode(p)) {
1756                 case SCROLL_MOVE:
1757                         fbcon_redraw_blit(vc, info, p, t, b - t - count,
1758                                      count);
1759                         __fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1760                         scr_memsetw((unsigned short *) (vc->vc_origin +
1761                                                         vc->vc_size_row *
1762                                                         (b - count)),
1763                                     vc->vc_video_erase_char,
1764                                     vc->vc_size_row * count);
1765                         return true;
1766
1767                 case SCROLL_WRAP_MOVE:
1768                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1769                                 if (t > 0)
1770                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1771                                                     vc->vc_cols);
1772                                 ywrap_up(vc, count);
1773                                 if (vc->vc_rows - b > 0)
1774                                         fbcon_bmove(vc, b - count, 0, b, 0,
1775                                                     vc->vc_rows - b,
1776                                                     vc->vc_cols);
1777                         } else if (info->flags & FBINFO_READS_FAST)
1778                                 fbcon_bmove(vc, t + count, 0, t, 0,
1779                                             b - t - count, vc->vc_cols);
1780                         else
1781                                 goto redraw_up;
1782                         __fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1783                         break;
1784
1785                 case SCROLL_PAN_REDRAW:
1786                         if ((p->yscroll + count <=
1787                              2 * (p->vrows - vc->vc_rows))
1788                             && ((!scroll_partial && (b - t == vc->vc_rows))
1789                                 || (scroll_partial
1790                                     && (b - t - count >
1791                                         3 * vc->vc_rows >> 2)))) {
1792                                 if (t > 0)
1793                                         fbcon_redraw_move(vc, p, 0, t, count);
1794                                 ypan_up_redraw(vc, t, count);
1795                                 if (vc->vc_rows - b > 0)
1796                                         fbcon_redraw_move(vc, p, b,
1797                                                           vc->vc_rows - b, b);
1798                         } else
1799                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1800                         __fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1801                         break;
1802
1803                 case SCROLL_PAN_MOVE:
1804                         if ((p->yscroll + count <=
1805                              2 * (p->vrows - vc->vc_rows))
1806                             && ((!scroll_partial && (b - t == vc->vc_rows))
1807                                 || (scroll_partial
1808                                     && (b - t - count >
1809                                         3 * vc->vc_rows >> 2)))) {
1810                                 if (t > 0)
1811                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1812                                                     vc->vc_cols);
1813                                 ypan_up(vc, count);
1814                                 if (vc->vc_rows - b > 0)
1815                                         fbcon_bmove(vc, b - count, 0, b, 0,
1816                                                     vc->vc_rows - b,
1817                                                     vc->vc_cols);
1818                         } else if (info->flags & FBINFO_READS_FAST)
1819                                 fbcon_bmove(vc, t + count, 0, t, 0,
1820                                             b - t - count, vc->vc_cols);
1821                         else
1822                                 goto redraw_up;
1823                         __fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1824                         break;
1825
1826                 case SCROLL_REDRAW:
1827                       redraw_up:
1828                         fbcon_redraw(vc, t, b - t - count,
1829                                      count * vc->vc_cols);
1830                         __fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1831                         scr_memsetw((unsigned short *) (vc->vc_origin +
1832                                                         vc->vc_size_row *
1833                                                         (b - count)),
1834                                     vc->vc_video_erase_char,
1835                                     vc->vc_size_row * count);
1836                         return true;
1837                 }
1838                 break;
1839
1840         case SM_DOWN:
1841                 if (count > vc->vc_rows)        /* Maximum realistic size */
1842                         count = vc->vc_rows;
1843                 switch (fb_scrollmode(p)) {
1844                 case SCROLL_MOVE:
1845                         fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
1846                                      -count);
1847                         __fbcon_clear(vc, t, 0, count, vc->vc_cols);
1848                         scr_memsetw((unsigned short *) (vc->vc_origin +
1849                                                         vc->vc_size_row *
1850                                                         t),
1851                                     vc->vc_video_erase_char,
1852                                     vc->vc_size_row * count);
1853                         return true;
1854
1855                 case SCROLL_WRAP_MOVE:
1856                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1857                                 if (vc->vc_rows - b > 0)
1858                                         fbcon_bmove(vc, b, 0, b - count, 0,
1859                                                     vc->vc_rows - b,
1860                                                     vc->vc_cols);
1861                                 ywrap_down(vc, count);
1862                                 if (t > 0)
1863                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1864                                                     vc->vc_cols);
1865                         } else if (info->flags & FBINFO_READS_FAST)
1866                                 fbcon_bmove(vc, t, 0, t + count, 0,
1867                                             b - t - count, vc->vc_cols);
1868                         else
1869                                 goto redraw_down;
1870                         __fbcon_clear(vc, t, 0, count, vc->vc_cols);
1871                         break;
1872
1873                 case SCROLL_PAN_MOVE:
1874                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1875                             && ((!scroll_partial && (b - t == vc->vc_rows))
1876                                 || (scroll_partial
1877                                     && (b - t - count >
1878                                         3 * vc->vc_rows >> 2)))) {
1879                                 if (vc->vc_rows - b > 0)
1880                                         fbcon_bmove(vc, b, 0, b - count, 0,
1881                                                     vc->vc_rows - b,
1882                                                     vc->vc_cols);
1883                                 ypan_down(vc, count);
1884                                 if (t > 0)
1885                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1886                                                     vc->vc_cols);
1887                         } else if (info->flags & FBINFO_READS_FAST)
1888                                 fbcon_bmove(vc, t, 0, t + count, 0,
1889                                             b - t - count, vc->vc_cols);
1890                         else
1891                                 goto redraw_down;
1892                         __fbcon_clear(vc, t, 0, count, vc->vc_cols);
1893                         break;
1894
1895                 case SCROLL_PAN_REDRAW:
1896                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1897                             && ((!scroll_partial && (b - t == vc->vc_rows))
1898                                 || (scroll_partial
1899                                     && (b - t - count >
1900                                         3 * vc->vc_rows >> 2)))) {
1901                                 if (vc->vc_rows - b > 0)
1902                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1903                                                           b - count);
1904                                 ypan_down_redraw(vc, t, count);
1905                                 if (t > 0)
1906                                         fbcon_redraw_move(vc, p, count, t, 0);
1907                         } else
1908                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1909                         __fbcon_clear(vc, t, 0, count, vc->vc_cols);
1910                         break;
1911
1912                 case SCROLL_REDRAW:
1913                       redraw_down:
1914                         fbcon_redraw(vc, b - 1, b - t - count,
1915                                      -count * vc->vc_cols);
1916                         __fbcon_clear(vc, t, 0, count, vc->vc_cols);
1917                         scr_memsetw((unsigned short *) (vc->vc_origin +
1918                                                         vc->vc_size_row *
1919                                                         t),
1920                                     vc->vc_video_erase_char,
1921                                     vc->vc_size_row * count);
1922                         return true;
1923                 }
1924         }
1925         return false;
1926 }
1927
1928
1929 static void updatescrollmode_accel(struct fbcon_display *p,
1930                                         struct fb_info *info,
1931                                         struct vc_data *vc)
1932 {
1933 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
1934         struct fbcon_ops *ops = info->fbcon_par;
1935         int cap = info->flags;
1936         u16 t = 0;
1937         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
1938                                   info->fix.xpanstep);
1939         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
1940         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1941         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1942                                    info->var.xres_virtual);
1943         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
1944                 divides(ypan, vc->vc_font.height) && vyres > yres;
1945         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
1946                 divides(ywrap, vc->vc_font.height) &&
1947                 divides(vc->vc_font.height, vyres) &&
1948                 divides(vc->vc_font.height, yres);
1949         int reading_fast = cap & FBINFO_READS_FAST;
1950         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
1951                 !(cap & FBINFO_HWACCEL_DISABLED);
1952         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
1953                 !(cap & FBINFO_HWACCEL_DISABLED);
1954
1955         if (good_wrap || good_pan) {
1956                 if (reading_fast || fast_copyarea)
1957                         p->scrollmode = good_wrap ?
1958                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
1959                 else
1960                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
1961                                 SCROLL_PAN_REDRAW;
1962         } else {
1963                 if (reading_fast || (fast_copyarea && !fast_imageblit))
1964                         p->scrollmode = SCROLL_MOVE;
1965                 else
1966                         p->scrollmode = SCROLL_REDRAW;
1967         }
1968 #endif
1969 }
1970
1971 static void updatescrollmode(struct fbcon_display *p,
1972                                         struct fb_info *info,
1973                                         struct vc_data *vc)
1974 {
1975         struct fbcon_ops *ops = info->fbcon_par;
1976         int fh = vc->vc_font.height;
1977         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1978         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1979                                    info->var.xres_virtual);
1980
1981         p->vrows = vyres/fh;
1982         if (yres > (fh * (vc->vc_rows + 1)))
1983                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
1984         if ((yres % fh) && (vyres % fh < yres % fh))
1985                 p->vrows--;
1986
1987         /* update scrollmode in case hardware acceleration is used */
1988         updatescrollmode_accel(p, info, vc);
1989 }
1990
1991 #define PITCH(w) (((w) + 7) >> 3)
1992 #define CALC_FONTSZ(h, p, c) ((h) * (p) * (c)) /* size = height * pitch * charcount */
1993
1994 static int fbcon_resize(struct vc_data *vc, unsigned int width,
1995                         unsigned int height, bool from_user)
1996 {
1997         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
1998         struct fbcon_ops *ops = info->fbcon_par;
1999         struct fbcon_display *p = &fb_display[vc->vc_num];
2000         struct fb_var_screeninfo var = info->var;
2001         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2002
2003         if (p->userfont && FNTSIZE(vc->vc_font.data)) {
2004                 int size;
2005                 int pitch = PITCH(vc->vc_font.width);
2006
2007                 /*
2008                  * If user font, ensure that a possible change to user font
2009                  * height or width will not allow a font data out-of-bounds access.
2010                  * NOTE: must use original charcount in calculation as font
2011                  * charcount can change and cannot be used to determine the
2012                  * font data allocated size.
2013                  */
2014                 if (pitch <= 0)
2015                         return -EINVAL;
2016                 size = CALC_FONTSZ(vc->vc_font.height, pitch, vc->vc_font.charcount);
2017                 if (size > FNTSIZE(vc->vc_font.data))
2018                         return -EINVAL;
2019         }
2020
2021         virt_w = FBCON_SWAP(ops->rotate, width, height);
2022         virt_h = FBCON_SWAP(ops->rotate, height, width);
2023         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2024                                  vc->vc_font.height);
2025         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2026                                  vc->vc_font.width);
2027         var.xres = virt_w * virt_fw;
2028         var.yres = virt_h * virt_fh;
2029         x_diff = info->var.xres - var.xres;
2030         y_diff = info->var.yres - var.yres;
2031         if (x_diff < 0 || x_diff > virt_fw ||
2032             y_diff < 0 || y_diff > virt_fh) {
2033                 const struct fb_videomode *mode;
2034
2035                 pr_debug("attempting resize %ix%i\n", var.xres, var.yres);
2036                 mode = fb_find_best_mode(&var, &info->modelist);
2037                 if (mode == NULL)
2038                         return -EINVAL;
2039                 display_to_var(&var, p);
2040                 fb_videomode_to_var(&var, mode);
2041
2042                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2043                         return -EINVAL;
2044
2045                 pr_debug("resize now %ix%i\n", var.xres, var.yres);
2046                 if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
2047                         var.activate = FB_ACTIVATE_NOW |
2048                                 FB_ACTIVATE_FORCE;
2049                         fb_set_var(info, &var);
2050                 }
2051                 var_to_display(p, &info->var, info);
2052                 ops->var = info->var;
2053         }
2054         updatescrollmode(p, info, vc);
2055         return 0;
2056 }
2057
2058 static bool fbcon_switch(struct vc_data *vc)
2059 {
2060         struct fb_info *info, *old_info = NULL;
2061         struct fbcon_ops *ops;
2062         struct fbcon_display *p = &fb_display[vc->vc_num];
2063         struct fb_var_screeninfo var;
2064         int i, ret, prev_console;
2065
2066         info = fbcon_info_from_console(vc->vc_num);
2067         ops = info->fbcon_par;
2068
2069         if (logo_shown >= 0) {
2070                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2071
2072                 if (conp2->vc_top == logo_lines
2073                     && conp2->vc_bottom == conp2->vc_rows)
2074                         conp2->vc_top = 0;
2075                 logo_shown = FBCON_LOGO_CANSHOW;
2076         }
2077
2078         prev_console = ops->currcon;
2079         if (prev_console != -1)
2080                 old_info = fbcon_info_from_console(prev_console);
2081         /*
2082          * FIXME: If we have multiple fbdev's loaded, we need to
2083          * update all info->currcon.  Perhaps, we can place this
2084          * in a centralized structure, but this might break some
2085          * drivers.
2086          *
2087          * info->currcon = vc->vc_num;
2088          */
2089         fbcon_for_each_registered_fb(i) {
2090                 if (fbcon_registered_fb[i]->fbcon_par) {
2091                         struct fbcon_ops *o = fbcon_registered_fb[i]->fbcon_par;
2092
2093                         o->currcon = vc->vc_num;
2094                 }
2095         }
2096         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2097         display_to_var(&var, p);
2098         var.activate = FB_ACTIVATE_NOW;
2099
2100         /*
2101          * make sure we don't unnecessarily trip the memcmp()
2102          * in fb_set_var()
2103          */
2104         info->var.activate = var.activate;
2105         var.vmode |= info->var.vmode & ~FB_VMODE_MASK;
2106         fb_set_var(info, &var);
2107         ops->var = info->var;
2108
2109         if (old_info != NULL && (old_info != info ||
2110                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2111                 if (info->fbops->fb_set_par) {
2112                         ret = info->fbops->fb_set_par(info);
2113
2114                         if (ret)
2115                                 printk(KERN_ERR "fbcon_switch: detected "
2116                                         "unhandled fb_set_par error, "
2117                                         "error code %d\n", ret);
2118                 }
2119
2120                 if (old_info != info)
2121                         fbcon_del_cursor_work(old_info);
2122         }
2123
2124         if (fbcon_is_inactive(vc, info) ||
2125             ops->blank_state != FB_BLANK_UNBLANK)
2126                 fbcon_del_cursor_work(info);
2127         else
2128                 fbcon_add_cursor_work(info);
2129
2130         set_blitting_type(vc, info);
2131         ops->cursor_reset = 1;
2132
2133         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2134                 ops->rotate = FB_ROTATE_UR;
2135                 set_blitting_type(vc, info);
2136         }
2137
2138         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2139         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2140
2141         if (vc->vc_font.charcount > 256)
2142                 vc->vc_complement_mask <<= 1;
2143
2144         updatescrollmode(p, info, vc);
2145
2146         switch (fb_scrollmode(p)) {
2147         case SCROLL_WRAP_MOVE:
2148                 scrollback_phys_max = p->vrows - vc->vc_rows;
2149                 break;
2150         case SCROLL_PAN_MOVE:
2151         case SCROLL_PAN_REDRAW:
2152                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2153                 if (scrollback_phys_max < 0)
2154                         scrollback_phys_max = 0;
2155                 break;
2156         default:
2157                 scrollback_phys_max = 0;
2158                 break;
2159         }
2160
2161         scrollback_max = 0;
2162         scrollback_current = 0;
2163
2164         if (!fbcon_is_inactive(vc, info)) {
2165             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2166             ops->update_start(info);
2167         }
2168
2169         fbcon_set_palette(vc, color_table);
2170         fbcon_clear_margins(vc, 0);
2171
2172         if (logo_shown == FBCON_LOGO_DRAW) {
2173
2174                 logo_shown = fg_console;
2175                 fb_show_logo(info, ops->rotate);
2176                 update_region(vc,
2177                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2178                               vc->vc_size_row * (vc->vc_bottom -
2179                                                  vc->vc_top) / 2);
2180                 return false;
2181         }
2182         return true;
2183 }
2184
2185 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2186                                 int blank)
2187 {
2188         if (blank) {
2189                 unsigned short charmask = vc->vc_hi_font_mask ?
2190                         0x1ff : 0xff;
2191                 unsigned short oldc;
2192
2193                 oldc = vc->vc_video_erase_char;
2194                 vc->vc_video_erase_char &= charmask;
2195                 __fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2196                 vc->vc_video_erase_char = oldc;
2197         }
2198 }
2199
2200 static bool fbcon_blank(struct vc_data *vc, enum vesa_blank_mode blank,
2201                         bool mode_switch)
2202 {
2203         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2204         struct fbcon_ops *ops = info->fbcon_par;
2205
2206         if (mode_switch) {
2207                 struct fb_var_screeninfo var = info->var;
2208
2209                 ops->graphics = 1;
2210
2211                 if (!blank) {
2212                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE |
2213                                 FB_ACTIVATE_KD_TEXT;
2214                         fb_set_var(info, &var);
2215                         ops->graphics = 0;
2216                         ops->var = info->var;
2217                 }
2218         }
2219
2220         if (!fbcon_is_inactive(vc, info)) {
2221                 if (ops->blank_state != blank) {
2222                         ops->blank_state = blank;
2223                         fbcon_cursor(vc, !blank);
2224                         ops->cursor_flash = (!blank);
2225
2226                         if (fb_blank(info, blank))
2227                                 fbcon_generic_blank(vc, info, blank);
2228                 }
2229
2230                 if (!blank)
2231                         update_screen(vc);
2232         }
2233
2234         if (mode_switch || fbcon_is_inactive(vc, info) ||
2235             ops->blank_state != FB_BLANK_UNBLANK)
2236                 fbcon_del_cursor_work(info);
2237         else
2238                 fbcon_add_cursor_work(info);
2239
2240         return false;
2241 }
2242
2243 static void fbcon_debug_enter(struct vc_data *vc)
2244 {
2245         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2246         struct fbcon_ops *ops = info->fbcon_par;
2247
2248         ops->save_graphics = ops->graphics;
2249         ops->graphics = 0;
2250         if (info->fbops->fb_debug_enter)
2251                 info->fbops->fb_debug_enter(info);
2252         fbcon_set_palette(vc, color_table);
2253 }
2254
2255 static void fbcon_debug_leave(struct vc_data *vc)
2256 {
2257         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2258         struct fbcon_ops *ops = info->fbcon_par;
2259
2260         ops->graphics = ops->save_graphics;
2261         if (info->fbops->fb_debug_leave)
2262                 info->fbops->fb_debug_leave(info);
2263 }
2264
2265 static int fbcon_get_font(struct vc_data *vc, struct console_font *font, unsigned int vpitch)
2266 {
2267         u8 *fontdata = vc->vc_font.data;
2268         u8 *data = font->data;
2269         int i, j;
2270
2271         font->width = vc->vc_font.width;
2272         font->height = vc->vc_font.height;
2273         if (font->height > vpitch)
2274                 return -ENOSPC;
2275         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2276         if (!font->data)
2277                 return 0;
2278
2279         if (font->width <= 8) {
2280                 j = vc->vc_font.height;
2281                 if (font->charcount * j > FNTSIZE(fontdata))
2282                         return -EINVAL;
2283
2284                 for (i = 0; i < font->charcount; i++) {
2285                         memcpy(data, fontdata, j);
2286                         memset(data + j, 0, vpitch - j);
2287                         data += vpitch;
2288                         fontdata += j;
2289                 }
2290         } else if (font->width <= 16) {
2291                 j = vc->vc_font.height * 2;
2292                 if (font->charcount * j > FNTSIZE(fontdata))
2293                         return -EINVAL;
2294
2295                 for (i = 0; i < font->charcount; i++) {
2296                         memcpy(data, fontdata, j);
2297                         memset(data + j, 0, 2*vpitch - j);
2298                         data += 2*vpitch;
2299                         fontdata += j;
2300                 }
2301         } else if (font->width <= 24) {
2302                 if (font->charcount * (vc->vc_font.height * sizeof(u32)) > FNTSIZE(fontdata))
2303                         return -EINVAL;
2304
2305                 for (i = 0; i < font->charcount; i++) {
2306                         for (j = 0; j < vc->vc_font.height; j++) {
2307                                 *data++ = fontdata[0];
2308                                 *data++ = fontdata[1];
2309                                 *data++ = fontdata[2];
2310                                 fontdata += sizeof(u32);
2311                         }
2312                         memset(data, 0, 3 * (vpitch - j));
2313                         data += 3 * (vpitch - j);
2314                 }
2315         } else {
2316                 j = vc->vc_font.height * 4;
2317                 if (font->charcount * j > FNTSIZE(fontdata))
2318                         return -EINVAL;
2319
2320                 for (i = 0; i < font->charcount; i++) {
2321                         memcpy(data, fontdata, j);
2322                         memset(data + j, 0, 4 * vpitch - j);
2323                         data += 4 * vpitch;
2324                         fontdata += j;
2325                 }
2326         }
2327         return 0;
2328 }
2329
2330 /* set/clear vc_hi_font_mask and update vc attrs accordingly */
2331 static void set_vc_hi_font(struct vc_data *vc, bool set)
2332 {
2333         if (!set) {
2334                 vc->vc_hi_font_mask = 0;
2335                 if (vc->vc_can_do_color) {
2336                         vc->vc_complement_mask >>= 1;
2337                         vc->vc_s_complement_mask >>= 1;
2338                 }
2339
2340                 /* ++Edmund: reorder the attribute bits */
2341                 if (vc->vc_can_do_color) {
2342                         unsigned short *cp =
2343                             (unsigned short *) vc->vc_origin;
2344                         int count = vc->vc_screenbuf_size / 2;
2345                         unsigned short c;
2346                         for (; count > 0; count--, cp++) {
2347                                 c = scr_readw(cp);
2348                                 scr_writew(((c & 0xfe00) >> 1) |
2349                                            (c & 0xff), cp);
2350                         }
2351                         c = vc->vc_video_erase_char;
2352                         vc->vc_video_erase_char =
2353                             ((c & 0xfe00) >> 1) | (c & 0xff);
2354                         vc->vc_attr >>= 1;
2355                 }
2356         } else {
2357                 vc->vc_hi_font_mask = 0x100;
2358                 if (vc->vc_can_do_color) {
2359                         vc->vc_complement_mask <<= 1;
2360                         vc->vc_s_complement_mask <<= 1;
2361                 }
2362
2363                 /* ++Edmund: reorder the attribute bits */
2364                 {
2365                         unsigned short *cp =
2366                             (unsigned short *) vc->vc_origin;
2367                         int count = vc->vc_screenbuf_size / 2;
2368                         unsigned short c;
2369                         for (; count > 0; count--, cp++) {
2370                                 unsigned short newc;
2371                                 c = scr_readw(cp);
2372                                 if (vc->vc_can_do_color)
2373                                         newc =
2374                                             ((c & 0xff00) << 1) | (c &
2375                                                                    0xff);
2376                                 else
2377                                         newc = c & ~0x100;
2378                                 scr_writew(newc, cp);
2379                         }
2380                         c = vc->vc_video_erase_char;
2381                         if (vc->vc_can_do_color) {
2382                                 vc->vc_video_erase_char =
2383                                     ((c & 0xff00) << 1) | (c & 0xff);
2384                                 vc->vc_attr <<= 1;
2385                         } else
2386                                 vc->vc_video_erase_char = c & ~0x100;
2387                 }
2388         }
2389 }
2390
2391 static int fbcon_do_set_font(struct vc_data *vc, int w, int h, int charcount,
2392                              const u8 * data, int userfont)
2393 {
2394         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2395         struct fbcon_ops *ops = info->fbcon_par;
2396         struct fbcon_display *p = &fb_display[vc->vc_num];
2397         int resize, ret, old_userfont, old_width, old_height, old_charcount;
2398         u8 *old_data = vc->vc_font.data;
2399
2400         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2401         vc->vc_font.data = (void *)(p->fontdata = data);
2402         old_userfont = p->userfont;
2403         if ((p->userfont = userfont))
2404                 REFCOUNT(data)++;
2405
2406         old_width = vc->vc_font.width;
2407         old_height = vc->vc_font.height;
2408         old_charcount = vc->vc_font.charcount;
2409
2410         vc->vc_font.width = w;
2411         vc->vc_font.height = h;
2412         vc->vc_font.charcount = charcount;
2413         if (vc->vc_hi_font_mask && charcount == 256)
2414                 set_vc_hi_font(vc, false);
2415         else if (!vc->vc_hi_font_mask && charcount == 512)
2416                 set_vc_hi_font(vc, true);
2417
2418         if (resize) {
2419                 int cols, rows;
2420
2421                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2422                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2423                 cols /= w;
2424                 rows /= h;
2425                 ret = vc_resize(vc, cols, rows);
2426                 if (ret)
2427                         goto err_out;
2428         } else if (con_is_visible(vc)
2429                    && vc->vc_mode == KD_TEXT) {
2430                 fbcon_clear_margins(vc, 0);
2431                 update_screen(vc);
2432         }
2433
2434         if (old_userfont && (--REFCOUNT(old_data) == 0))
2435                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2436         return 0;
2437
2438 err_out:
2439         p->fontdata = old_data;
2440         vc->vc_font.data = old_data;
2441
2442         if (userfont) {
2443                 p->userfont = old_userfont;
2444                 if (--REFCOUNT(data) == 0)
2445                         kfree(data - FONT_EXTRA_WORDS * sizeof(int));
2446         }
2447
2448         vc->vc_font.width = old_width;
2449         vc->vc_font.height = old_height;
2450         vc->vc_font.charcount = old_charcount;
2451
2452         return ret;
2453 }
2454
2455 /*
2456  *  User asked to set font; we are guaranteed that charcount does not exceed 512
2457  *  but lets not assume that, since charcount of 512 is small for unicode support.
2458  */
2459
2460 static int fbcon_set_font(struct vc_data *vc, const struct console_font *font,
2461                           unsigned int vpitch, unsigned int flags)
2462 {
2463         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2464         unsigned charcount = font->charcount;
2465         int w = font->width;
2466         int h = font->height;
2467         int size;
2468         int i, csum;
2469         u8 *new_data, *data = font->data;
2470         int pitch = PITCH(font->width);
2471
2472         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2473          * If not this check should be changed to charcount < 256 */
2474         if (charcount != 256 && charcount != 512)
2475                 return -EINVAL;
2476
2477         /* font bigger than screen resolution ? */
2478         if (w > FBCON_SWAP(info->var.rotate, info->var.xres, info->var.yres) ||
2479             h > FBCON_SWAP(info->var.rotate, info->var.yres, info->var.xres))
2480                 return -EINVAL;
2481
2482         if (font->width > FB_MAX_BLIT_WIDTH || font->height > FB_MAX_BLIT_HEIGHT)
2483                 return -EINVAL;
2484
2485         /* Make sure drawing engine can handle the font */
2486         if (!test_bit(font->width - 1, info->pixmap.blit_x) ||
2487             !test_bit(font->height - 1, info->pixmap.blit_y))
2488                 return -EINVAL;
2489
2490         /* Make sure driver can handle the font length */
2491         if (fbcon_invalid_charcount(info, charcount))
2492                 return -EINVAL;
2493
2494         size = CALC_FONTSZ(h, pitch, charcount);
2495
2496         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2497
2498         if (!new_data)
2499                 return -ENOMEM;
2500
2501         memset(new_data, 0, FONT_EXTRA_WORDS * sizeof(int));
2502
2503         new_data += FONT_EXTRA_WORDS * sizeof(int);
2504         FNTSIZE(new_data) = size;
2505         REFCOUNT(new_data) = 0; /* usage counter */
2506         for (i=0; i< charcount; i++) {
2507                 memcpy(new_data + i*h*pitch, data +  i*vpitch*pitch, h*pitch);
2508         }
2509
2510         /* Since linux has a nice crc32 function use it for counting font
2511          * checksums. */
2512         csum = crc32(0, new_data, size);
2513
2514         FNTSUM(new_data) = csum;
2515         /* Check if the same font is on some other console already */
2516         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2517                 struct vc_data *tmp = vc_cons[i].d;
2518
2519                 if (fb_display[i].userfont &&
2520                     fb_display[i].fontdata &&
2521                     FNTSUM(fb_display[i].fontdata) == csum &&
2522                     FNTSIZE(fb_display[i].fontdata) == size &&
2523                     tmp->vc_font.width == w &&
2524                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2525                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2526                         new_data = (u8 *)fb_display[i].fontdata;
2527                         break;
2528                 }
2529         }
2530         return fbcon_do_set_font(vc, font->width, font->height, charcount, new_data, 1);
2531 }
2532
2533 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font,
2534                               const char *name)
2535 {
2536         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2537         const struct font_desc *f;
2538
2539         if (!name)
2540                 f = get_default_font(info->var.xres, info->var.yres,
2541                                      info->pixmap.blit_x, info->pixmap.blit_y);
2542         else if (!(f = find_font(name)))
2543                 return -ENOENT;
2544
2545         font->width = f->width;
2546         font->height = f->height;
2547         return fbcon_do_set_font(vc, f->width, f->height, f->charcount, f->data, 0);
2548 }
2549
2550 static u16 palette_red[16];
2551 static u16 palette_green[16];
2552 static u16 palette_blue[16];
2553
2554 static struct fb_cmap palette_cmap = {
2555         0, 16, palette_red, palette_green, palette_blue, NULL
2556 };
2557
2558 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table)
2559 {
2560         struct fb_info *info = fbcon_info_from_console(vc->vc_num);
2561         int i, j, k, depth;
2562         u8 val;
2563
2564         if (fbcon_is_inactive(vc, info))
2565                 return;
2566
2567         if (!con_is_visible(vc))
2568                 return;
2569
2570         depth = fb_get_color_depth(&info->var, &info->fix);
2571         if (depth > 3) {
2572                 for (i = j = 0; i < 16; i++) {
2573                         k = table[i];
2574                         val = vc->vc_palette[j++];
2575                         palette_red[k] = (val << 8) | val;
2576                         val = vc->vc_palette[j++];
2577                         palette_green[k] = (val << 8) | val;
2578                         val = vc->vc_palette[j++];
2579                         palette_blue[k] = (val << 8) | val;
2580                 }
2581                 palette_cmap.len = 16;
2582                 palette_cmap.start = 0;
2583         /*
2584          * If framebuffer is capable of less than 16 colors,
2585          * use default palette of fbcon.
2586          */
2587         } else
2588                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2589
2590         fb_set_cmap(&palette_cmap, info);
2591 }
2592
2593 /* As we might be inside of softback, we may work with non-contiguous buffer,
2594    that's why we have to use a separate routine. */
2595 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2596 {
2597         while (cnt--) {
2598                 u16 a = scr_readw(p);
2599                 if (!vc->vc_can_do_color)
2600                         a ^= 0x0800;
2601                 else if (vc->vc_hi_font_mask == 0x100)
2602                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2603                             (((a) & 0x0e00) << 4);
2604                 else
2605                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2606                             (((a) & 0x0700) << 4);
2607                 scr_writew(a, p++);
2608         }
2609 }
2610
2611 void fbcon_suspended(struct fb_info *info)
2612 {
2613         struct vc_data *vc = NULL;
2614         struct fbcon_ops *ops = info->fbcon_par;
2615
2616         if (!ops || ops->currcon < 0)
2617                 return;
2618         vc = vc_cons[ops->currcon].d;
2619
2620         /* Clear cursor, restore saved data */
2621         fbcon_cursor(vc, false);
2622 }
2623
2624 void fbcon_resumed(struct fb_info *info)
2625 {
2626         struct vc_data *vc;
2627         struct fbcon_ops *ops = info->fbcon_par;
2628
2629         if (!ops || ops->currcon < 0)
2630                 return;
2631         vc = vc_cons[ops->currcon].d;
2632
2633         update_screen(vc);
2634 }
2635
2636 static void fbcon_modechanged(struct fb_info *info)
2637 {
2638         struct fbcon_ops *ops = info->fbcon_par;
2639         struct vc_data *vc;
2640         struct fbcon_display *p;
2641         int rows, cols;
2642
2643         if (!ops || ops->currcon < 0)
2644                 return;
2645         vc = vc_cons[ops->currcon].d;
2646         if (vc->vc_mode != KD_TEXT ||
2647             fbcon_info_from_console(ops->currcon) != info)
2648                 return;
2649
2650         p = &fb_display[vc->vc_num];
2651         set_blitting_type(vc, info);
2652
2653         if (con_is_visible(vc)) {
2654                 var_to_display(p, &info->var, info);
2655                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2656                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2657                 cols /= vc->vc_font.width;
2658                 rows /= vc->vc_font.height;
2659                 vc_resize(vc, cols, rows);
2660                 updatescrollmode(p, info, vc);
2661                 scrollback_max = 0;
2662                 scrollback_current = 0;
2663
2664                 if (!fbcon_is_inactive(vc, info)) {
2665                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2666                     ops->update_start(info);
2667                 }
2668
2669                 fbcon_set_palette(vc, color_table);
2670                 update_screen(vc);
2671         }
2672 }
2673
2674 static void fbcon_set_all_vcs(struct fb_info *info)
2675 {
2676         struct fbcon_ops *ops = info->fbcon_par;
2677         struct vc_data *vc;
2678         struct fbcon_display *p;
2679         int i, rows, cols, fg = -1;
2680
2681         if (!ops || ops->currcon < 0)
2682                 return;
2683
2684         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2685                 vc = vc_cons[i].d;
2686                 if (!vc || vc->vc_mode != KD_TEXT ||
2687                     fbcon_info_from_console(i) != info)
2688                         continue;
2689
2690                 if (con_is_visible(vc)) {
2691                         fg = i;
2692                         continue;
2693                 }
2694
2695                 p = &fb_display[vc->vc_num];
2696                 set_blitting_type(vc, info);
2697                 var_to_display(p, &info->var, info);
2698                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2699                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2700                 cols /= vc->vc_font.width;
2701                 rows /= vc->vc_font.height;
2702                 vc_resize(vc, cols, rows);
2703         }
2704
2705         if (fg != -1)
2706                 fbcon_modechanged(info);
2707 }
2708
2709
2710 void fbcon_update_vcs(struct fb_info *info, bool all)
2711 {
2712         if (all)
2713                 fbcon_set_all_vcs(info);
2714         else
2715                 fbcon_modechanged(info);
2716 }
2717 EXPORT_SYMBOL(fbcon_update_vcs);
2718
2719 /* let fbcon check if it supports a new screen resolution */
2720 int fbcon_modechange_possible(struct fb_info *info, struct fb_var_screeninfo *var)
2721 {
2722         struct fbcon_ops *ops = info->fbcon_par;
2723         struct vc_data *vc;
2724         unsigned int i;
2725
2726         WARN_CONSOLE_UNLOCKED();
2727
2728         if (!ops)
2729                 return 0;
2730
2731         /* prevent setting a screen size which is smaller than font size */
2732         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2733                 vc = vc_cons[i].d;
2734                 if (!vc || vc->vc_mode != KD_TEXT ||
2735                            fbcon_info_from_console(i) != info)
2736                         continue;
2737
2738                 if (vc->vc_font.width  > FBCON_SWAP(var->rotate, var->xres, var->yres) ||
2739                     vc->vc_font.height > FBCON_SWAP(var->rotate, var->yres, var->xres))
2740                         return -EINVAL;
2741         }
2742
2743         return 0;
2744 }
2745 EXPORT_SYMBOL_GPL(fbcon_modechange_possible);
2746
2747 int fbcon_mode_deleted(struct fb_info *info,
2748                        struct fb_videomode *mode)
2749 {
2750         struct fb_info *fb_info;
2751         struct fbcon_display *p;
2752         int i, j, found = 0;
2753
2754         /* before deletion, ensure that mode is not in use */
2755         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2756                 j = con2fb_map[i];
2757                 if (j == -1)
2758                         continue;
2759                 fb_info = fbcon_registered_fb[j];
2760                 if (fb_info != info)
2761                         continue;
2762                 p = &fb_display[i];
2763                 if (!p || !p->mode)
2764                         continue;
2765                 if (fb_mode_is_equal(p->mode, mode)) {
2766                         found = 1;
2767                         break;
2768                 }
2769         }
2770         return found;
2771 }
2772
2773 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2774 static void fbcon_unbind(void)
2775 {
2776         int ret;
2777
2778         ret = do_unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
2779                                 fbcon_is_default);
2780
2781         if (!ret)
2782                 fbcon_has_console_bind = 0;
2783 }
2784 #else
2785 static inline void fbcon_unbind(void) {}
2786 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
2787
2788 void fbcon_fb_unbind(struct fb_info *info)
2789 {
2790         int i, new_idx = -1;
2791         int idx = info->node;
2792
2793         console_lock();
2794
2795         if (!fbcon_has_console_bind) {
2796                 console_unlock();
2797                 return;
2798         }
2799
2800         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2801                 if (con2fb_map[i] != idx &&
2802                     con2fb_map[i] != -1) {
2803                         new_idx = con2fb_map[i];
2804                         break;
2805                 }
2806         }
2807
2808         if (new_idx != -1) {
2809                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2810                         if (con2fb_map[i] == idx)
2811                                 set_con2fb_map(i, new_idx, 0);
2812                 }
2813         } else {
2814                 struct fb_info *info = fbcon_registered_fb[idx];
2815
2816                 /* This is sort of like set_con2fb_map, except it maps
2817                  * the consoles to no device and then releases the
2818                  * oldinfo to free memory and cancel the cursor blink
2819                  * timer. I can imagine this just becoming part of
2820                  * set_con2fb_map where new_idx is -1
2821                  */
2822                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2823                         if (con2fb_map[i] == idx) {
2824                                 con2fb_map[i] = -1;
2825                                 if (!search_fb_in_map(idx)) {
2826                                         con2fb_release_oldinfo(vc_cons[i].d,
2827                                                                info, NULL);
2828                                 }
2829                         }
2830                 }
2831                 fbcon_unbind();
2832         }
2833
2834         console_unlock();
2835 }
2836
2837 void fbcon_fb_unregistered(struct fb_info *info)
2838 {
2839         int i, idx;
2840
2841         console_lock();
2842
2843         fbcon_registered_fb[info->node] = NULL;
2844         fbcon_num_registered_fb--;
2845
2846         if (deferred_takeover) {
2847                 console_unlock();
2848                 return;
2849         }
2850
2851         idx = info->node;
2852         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2853                 if (con2fb_map[i] == idx)
2854                         con2fb_map[i] = -1;
2855         }
2856
2857         if (idx == info_idx) {
2858                 info_idx = -1;
2859
2860                 fbcon_for_each_registered_fb(i) {
2861                         info_idx = i;
2862                         break;
2863                 }
2864         }
2865
2866         if (info_idx != -1) {
2867                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2868                         if (con2fb_map[i] == -1)
2869                                 con2fb_map[i] = info_idx;
2870                 }
2871         }
2872
2873         if (primary_device == idx)
2874                 primary_device = -1;
2875
2876         if (!fbcon_num_registered_fb)
2877                 do_unregister_con_driver(&fb_con);
2878         console_unlock();
2879 }
2880
2881 void fbcon_remap_all(struct fb_info *info)
2882 {
2883         int i, idx = info->node;
2884
2885         console_lock();
2886         if (deferred_takeover) {
2887                 for (i = first_fb_vc; i <= last_fb_vc; i++)
2888                         con2fb_map_boot[i] = idx;
2889                 fbcon_map_override();
2890                 console_unlock();
2891                 return;
2892         }
2893
2894         for (i = first_fb_vc; i <= last_fb_vc; i++)
2895                 set_con2fb_map(i, idx, 0);
2896
2897         if (con_is_bound(&fb_con)) {
2898                 printk(KERN_INFO "fbcon: Remapping primary device, "
2899                        "fb%i, to tty %i-%i\n", idx,
2900                        first_fb_vc + 1, last_fb_vc + 1);
2901                 info_idx = idx;
2902         }
2903         console_unlock();
2904 }
2905
2906 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
2907 static void fbcon_select_primary(struct fb_info *info)
2908 {
2909         if (!map_override && primary_device == -1 &&
2910             fb_is_primary_device(info)) {
2911                 int i;
2912
2913                 printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
2914                        info->fix.id, info->node);
2915                 primary_device = info->node;
2916
2917                 for (i = first_fb_vc; i <= last_fb_vc; i++)
2918                         con2fb_map_boot[i] = primary_device;
2919
2920                 if (con_is_bound(&fb_con)) {
2921                         printk(KERN_INFO "fbcon: Remapping primary device, "
2922                                "fb%i, to tty %i-%i\n", info->node,
2923                                first_fb_vc + 1, last_fb_vc + 1);
2924                         info_idx = primary_device;
2925                 }
2926         }
2927
2928 }
2929 #else
2930 static inline void fbcon_select_primary(struct fb_info *info)
2931 {
2932         return;
2933 }
2934 #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
2935
2936 static bool lockless_register_fb;
2937 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
2938 MODULE_PARM_DESC(lockless_register_fb,
2939         "Lockless framebuffer registration for debugging [default=off]");
2940
2941 /* called with console_lock held */
2942 static int do_fb_registered(struct fb_info *info)
2943 {
2944         int ret = 0, i, idx;
2945
2946         WARN_CONSOLE_UNLOCKED();
2947
2948         fbcon_registered_fb[info->node] = info;
2949         fbcon_num_registered_fb++;
2950
2951         idx = info->node;
2952         fbcon_select_primary(info);
2953
2954         if (deferred_takeover) {
2955                 pr_info("fbcon: Deferring console take-over\n");
2956                 return 0;
2957         }
2958
2959         if (info_idx == -1) {
2960                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2961                         if (con2fb_map_boot[i] == idx) {
2962                                 info_idx = idx;
2963                                 break;
2964                         }
2965                 }
2966
2967                 if (info_idx != -1)
2968                         ret = do_fbcon_takeover(1);
2969         } else {
2970                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2971                         if (con2fb_map_boot[i] == idx)
2972                                 set_con2fb_map(i, idx, 0);
2973                 }
2974         }
2975
2976         return ret;
2977 }
2978
2979 int fbcon_fb_registered(struct fb_info *info)
2980 {
2981         int ret;
2982
2983         if (!lockless_register_fb)
2984                 console_lock();
2985         else
2986                 atomic_inc(&ignore_console_lock_warning);
2987
2988         ret = do_fb_registered(info);
2989
2990         if (!lockless_register_fb)
2991                 console_unlock();
2992         else
2993                 atomic_dec(&ignore_console_lock_warning);
2994
2995         return ret;
2996 }
2997
2998 void fbcon_fb_blanked(struct fb_info *info, int blank)
2999 {
3000         struct fbcon_ops *ops = info->fbcon_par;
3001         struct vc_data *vc;
3002
3003         if (!ops || ops->currcon < 0)
3004                 return;
3005
3006         vc = vc_cons[ops->currcon].d;
3007         if (vc->vc_mode != KD_TEXT ||
3008                         fbcon_info_from_console(ops->currcon) != info)
3009                 return;
3010
3011         if (con_is_visible(vc)) {
3012                 if (blank)
3013                         do_blank_screen(0);
3014                 else
3015                         do_unblank_screen(0);
3016         }
3017         ops->blank_state = blank;
3018 }
3019
3020 void fbcon_new_modelist(struct fb_info *info)
3021 {
3022         int i;
3023         struct vc_data *vc;
3024         struct fb_var_screeninfo var;
3025         const struct fb_videomode *mode;
3026
3027         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3028                 if (fbcon_info_from_console(i) != info)
3029                         continue;
3030                 if (!fb_display[i].mode)
3031                         continue;
3032                 vc = vc_cons[i].d;
3033                 display_to_var(&var, &fb_display[i]);
3034                 mode = fb_find_nearest_mode(fb_display[i].mode,
3035                                             &info->modelist);
3036                 fb_videomode_to_var(&var, mode);
3037                 fbcon_set_disp(info, &var, vc->vc_num);
3038         }
3039 }
3040
3041 void fbcon_get_requirement(struct fb_info *info,
3042                            struct fb_blit_caps *caps)
3043 {
3044         struct vc_data *vc;
3045
3046         if (caps->flags) {
3047                 int i, charcnt;
3048
3049                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3050                         vc = vc_cons[i].d;
3051                         if (vc && vc->vc_mode == KD_TEXT &&
3052                             info->node == con2fb_map[i]) {
3053                                 set_bit(vc->vc_font.width - 1, caps->x);
3054                                 set_bit(vc->vc_font.height - 1, caps->y);
3055                                 charcnt = vc->vc_font.charcount;
3056                                 if (caps->len < charcnt)
3057                                         caps->len = charcnt;
3058                         }
3059                 }
3060         } else {
3061                 vc = vc_cons[fg_console].d;
3062
3063                 if (vc && vc->vc_mode == KD_TEXT &&
3064                     info->node == con2fb_map[fg_console]) {
3065                         bitmap_zero(caps->x, FB_MAX_BLIT_WIDTH);
3066                         set_bit(vc->vc_font.width - 1, caps->x);
3067                         bitmap_zero(caps->y, FB_MAX_BLIT_HEIGHT);
3068                         set_bit(vc->vc_font.height - 1, caps->y);
3069                         caps->len = vc->vc_font.charcount;
3070                 }
3071         }
3072 }
3073
3074 int fbcon_set_con2fb_map_ioctl(void __user *argp)
3075 {
3076         struct fb_con2fbmap con2fb;
3077         int ret;
3078
3079         if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
3080                 return -EFAULT;
3081         if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
3082                 return -EINVAL;
3083         if (con2fb.framebuffer >= FB_MAX)
3084                 return -EINVAL;
3085         if (!fbcon_registered_fb[con2fb.framebuffer])
3086                 request_module("fb%d", con2fb.framebuffer);
3087         if (!fbcon_registered_fb[con2fb.framebuffer]) {
3088                 return -EINVAL;
3089         }
3090
3091         console_lock();
3092         ret = set_con2fb_map(con2fb.console - 1,
3093                              con2fb.framebuffer, 1);
3094         console_unlock();
3095
3096         return ret;
3097 }
3098
3099 int fbcon_get_con2fb_map_ioctl(void __user *argp)
3100 {
3101         struct fb_con2fbmap con2fb;
3102
3103         if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
3104                 return -EFAULT;
3105         if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
3106                 return -EINVAL;
3107
3108         console_lock();
3109         con2fb.framebuffer = con2fb_map[con2fb.console - 1];
3110         console_unlock();
3111
3112         return copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
3113 }
3114
3115 /*
3116  *  The console `switch' structure for the frame buffer based console
3117  */
3118
3119 static const struct consw fb_con = {
3120         .owner                  = THIS_MODULE,
3121         .con_startup            = fbcon_startup,
3122         .con_init               = fbcon_init,
3123         .con_deinit             = fbcon_deinit,
3124         .con_clear              = fbcon_clear,
3125         .con_putcs              = fbcon_putcs,
3126         .con_cursor             = fbcon_cursor,
3127         .con_scroll             = fbcon_scroll,
3128         .con_switch             = fbcon_switch,
3129         .con_blank              = fbcon_blank,
3130         .con_font_set           = fbcon_set_font,
3131         .con_font_get           = fbcon_get_font,
3132         .con_font_default       = fbcon_set_def_font,
3133         .con_set_palette        = fbcon_set_palette,
3134         .con_invert_region      = fbcon_invert_region,
3135         .con_resize             = fbcon_resize,
3136         .con_debug_enter        = fbcon_debug_enter,
3137         .con_debug_leave        = fbcon_debug_leave,
3138 };
3139
3140 static ssize_t store_rotate(struct device *device,
3141                             struct device_attribute *attr, const char *buf,
3142                             size_t count)
3143 {
3144         struct fb_info *info;
3145         int rotate, idx;
3146         char **last = NULL;
3147
3148         console_lock();
3149         idx = con2fb_map[fg_console];
3150
3151         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3152                 goto err;
3153
3154         info = fbcon_registered_fb[idx];
3155         rotate = simple_strtoul(buf, last, 0);
3156         fbcon_rotate(info, rotate);
3157 err:
3158         console_unlock();
3159         return count;
3160 }
3161
3162 static ssize_t store_rotate_all(struct device *device,
3163                                 struct device_attribute *attr,const char *buf,
3164                                 size_t count)
3165 {
3166         struct fb_info *info;
3167         int rotate, idx;
3168         char **last = NULL;
3169
3170         console_lock();
3171         idx = con2fb_map[fg_console];
3172
3173         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3174                 goto err;
3175
3176         info = fbcon_registered_fb[idx];
3177         rotate = simple_strtoul(buf, last, 0);
3178         fbcon_rotate_all(info, rotate);
3179 err:
3180         console_unlock();
3181         return count;
3182 }
3183
3184 static ssize_t show_rotate(struct device *device,
3185                            struct device_attribute *attr,char *buf)
3186 {
3187         struct fb_info *info;
3188         int rotate = 0, idx;
3189
3190         console_lock();
3191         idx = con2fb_map[fg_console];
3192
3193         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3194                 goto err;
3195
3196         info = fbcon_registered_fb[idx];
3197         rotate = fbcon_get_rotate(info);
3198 err:
3199         console_unlock();
3200         return sysfs_emit(buf, "%d\n", rotate);
3201 }
3202
3203 static ssize_t show_cursor_blink(struct device *device,
3204                                  struct device_attribute *attr, char *buf)
3205 {
3206         struct fb_info *info;
3207         struct fbcon_ops *ops;
3208         int idx, blink = -1;
3209
3210         console_lock();
3211         idx = con2fb_map[fg_console];
3212
3213         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3214                 goto err;
3215
3216         info = fbcon_registered_fb[idx];
3217         ops = info->fbcon_par;
3218
3219         if (!ops)
3220                 goto err;
3221
3222         blink = delayed_work_pending(&ops->cursor_work);
3223 err:
3224         console_unlock();
3225         return sysfs_emit(buf, "%d\n", blink);
3226 }
3227
3228 static ssize_t store_cursor_blink(struct device *device,
3229                                   struct device_attribute *attr,
3230                                   const char *buf, size_t count)
3231 {
3232         struct fb_info *info;
3233         int blink, idx;
3234         char **last = NULL;
3235
3236         console_lock();
3237         idx = con2fb_map[fg_console];
3238
3239         if (idx == -1 || fbcon_registered_fb[idx] == NULL)
3240                 goto err;
3241
3242         info = fbcon_registered_fb[idx];
3243
3244         if (!info->fbcon_par)
3245                 goto err;
3246
3247         blink = simple_strtoul(buf, last, 0);
3248
3249         if (blink) {
3250                 fbcon_cursor_noblink = 0;
3251                 fbcon_add_cursor_work(info);
3252         } else {
3253                 fbcon_cursor_noblink = 1;
3254                 fbcon_del_cursor_work(info);
3255         }
3256
3257 err:
3258         console_unlock();
3259         return count;
3260 }
3261
3262 static struct device_attribute device_attrs[] = {
3263         __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
3264         __ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
3265         __ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
3266                store_cursor_blink),
3267 };
3268
3269 static int fbcon_init_device(void)
3270 {
3271         int i, error = 0;
3272
3273         fbcon_has_sysfs = 1;
3274
3275         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3276                 error = device_create_file(fbcon_device, &device_attrs[i]);
3277
3278                 if (error)
3279                         break;
3280         }
3281
3282         if (error) {
3283                 while (--i >= 0)
3284                         device_remove_file(fbcon_device, &device_attrs[i]);
3285
3286                 fbcon_has_sysfs = 0;
3287         }
3288
3289         return 0;
3290 }
3291
3292 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
3293 static void fbcon_register_existing_fbs(struct work_struct *work)
3294 {
3295         int i;
3296
3297         console_lock();
3298
3299         deferred_takeover = false;
3300         logo_shown = FBCON_LOGO_DONTSHOW;
3301
3302         fbcon_for_each_registered_fb(i)
3303                 do_fb_registered(fbcon_registered_fb[i]);
3304
3305         console_unlock();
3306 }
3307
3308 static struct notifier_block fbcon_output_nb;
3309 static DECLARE_WORK(fbcon_deferred_takeover_work, fbcon_register_existing_fbs);
3310
3311 static int fbcon_output_notifier(struct notifier_block *nb,
3312                                  unsigned long action, void *data)
3313 {
3314         WARN_CONSOLE_UNLOCKED();
3315
3316         pr_info("fbcon: Taking over console\n");
3317
3318         dummycon_unregister_output_notifier(&fbcon_output_nb);
3319
3320         /* We may get called in atomic context */
3321         schedule_work(&fbcon_deferred_takeover_work);
3322
3323         return NOTIFY_OK;
3324 }
3325 #endif
3326
3327 static void fbcon_start(void)
3328 {
3329         WARN_CONSOLE_UNLOCKED();
3330
3331 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
3332         if (conswitchp != &dummy_con)
3333                 deferred_takeover = false;
3334
3335         if (deferred_takeover) {
3336                 fbcon_output_nb.notifier_call = fbcon_output_notifier;
3337                 dummycon_register_output_notifier(&fbcon_output_nb);
3338                 return;
3339         }
3340 #endif
3341 }
3342
3343 void __init fb_console_init(void)
3344 {
3345         int i;
3346
3347         console_lock();
3348         fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
3349                                      "fbcon");
3350
3351         if (IS_ERR(fbcon_device)) {
3352                 printk(KERN_WARNING "Unable to create device "
3353                        "for fbcon; errno = %ld\n",
3354                        PTR_ERR(fbcon_device));
3355                 fbcon_device = NULL;
3356         } else
3357                 fbcon_init_device();
3358
3359         for (i = 0; i < MAX_NR_CONSOLES; i++)
3360                 con2fb_map[i] = -1;
3361
3362         fbcon_start();
3363         console_unlock();
3364 }
3365
3366 #ifdef MODULE
3367
3368 static void __exit fbcon_deinit_device(void)
3369 {
3370         int i;
3371
3372         if (fbcon_has_sysfs) {
3373                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3374                         device_remove_file(fbcon_device, &device_attrs[i]);
3375
3376                 fbcon_has_sysfs = 0;
3377         }
3378 }
3379
3380 void __exit fb_console_exit(void)
3381 {
3382 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
3383         console_lock();
3384         if (deferred_takeover)
3385                 dummycon_unregister_output_notifier(&fbcon_output_nb);
3386         console_unlock();
3387
3388         cancel_work_sync(&fbcon_deferred_takeover_work);
3389 #endif
3390
3391         console_lock();
3392         fbcon_deinit_device();
3393         device_destroy(fb_class, MKDEV(0, 0));
3394
3395         do_unregister_con_driver(&fb_con);
3396         console_unlock();
3397 }
3398 #endif