drivers/video/fbdev/core/fbcon.c

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