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