drivers/video/fbdev/core/fbcon.c

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