drivers/video/fbdev/core/fbcon.c

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