drivers/video/fbdev/core/fbcon.c

   1 /*
   2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1995 Geert Uytterhoeven
   5  *
   6  *
   7  *  This file is based on the original Amiga console driver (amicon.c):
   8  *
   9  *      Copyright (C) 1993 Hamish Macdonald
  10  *                         Greg Harp
  11  *      Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
  12  *
  13  *            with work by William Rucklidge (wjr@cs.cornell.edu)
  14  *                         Geert Uytterhoeven
  15  *                         Jes Sorensen (jds@kom.auc.dk)
  16  *                         Martin Apel
  17  *
  18  *  and on the original Atari console driver (atacon.c):
  19  *
  20  *      Copyright (C) 1993 Bjoern Brauel
  21  *                         Roman Hodek
  22  *
  23  *            with work by Guenther Kelleter
  24  *                         Martin Schaller
  25  *                         Andreas Schwab
  26  *
  27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
  28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
  29  *  and software scrollback added by
  30  *                         Jakub Jelinek (jj@ultra.linux.cz)
  31  *
  32  *  Random hacking by Martin Mares <mj@ucw.cz>
  33  *
  34  *      2001 - Documented with DocBook
  35  *      - Brad Douglas <brad@neruo.com>
  36  *
  37  *  The low level operations for the various display memory organizations are
  38  *  now in separate source files.
  39  *
  40  *  Currently the following organizations are supported:
  41  *
  42  *    o afb                     Amiga bitplanes
  43  *    o cfb{2,4,8,16,24,32}     Packed pixels
  44  *    o ilbm                    Amiga interleaved bitplanes
  45  *    o iplan2p[248]            Atari interleaved bitplanes
  46  *    o mfb                     Monochrome
  47  *    o vga                     VGA characters/attributes
  48  *
  49  *  To do:
  50  *
  51  *    - Implement 16 plane mode (iplan2p16)
  52  *
  53  *
  54  *  This file is subject to the terms and conditions of the GNU General Public
  55  *  License.  See the file COPYING in the main directory of this archive for
  56  *  more details.
  57  */
  58
  59 #include <linux/module.h>
  60 #include <linux/types.h>
  61 #include <linux/fs.h>
  62 #include <linux/kernel.h>
  63 #include <linux/delay.h>        /* MSch: for IRQ probe */
  64 #include <linux/console.h>
  65 #include <linux/string.h>
  66 #include <linux/kd.h>
  67 #include <linux/slab.h>
  68 #include <linux/fb.h>
  69 #include <linux/fbcon.h>
  70 #include <linux/vt_kern.h>
  71 #include <linux/selection.h>
  72 #include <linux/font.h>
  73 #include <linux/smp.h>
  74 #include <linux/init.h>
  75 #include <linux/interrupt.h>
  76 #include <linux/crc32.h> /* For counting font checksums */
  77 #include <linux/uaccess.h>
  78 #include <asm/fb.h>
  79 #include <asm/irq.h>
  80
  81 #include "fbcon.h"
  82
  83 /*
  84  * FIXME: Locking
  85  *
  86  * - fbcon state itself is protected by the console_lock, and the code does a
  87  *   pretty good job at making sure that lock is held everywhere it's needed.
  88  *
  89  * - access to the registered_fb array is entirely unprotected. This should use
  90  *   proper object lifetime handling, i.e. get/put_fb_info. This also means
  91  *   switching from indices to proper pointers for fb_info everywhere.
  92  *
  93  * - fbcon doesn't bother with fb_lock/unlock at all. This is buggy, since it
  94  *   means concurrent access to the same fbdev from both fbcon and userspace
  95  *   will blow up. To fix this all fbcon calls from fbmem.c need to be moved out
  96  *   of fb_lock/unlock protected sections, since otherwise we'll recurse and
  97  *   deadlock eventually. Aside: Due to these deadlock issues the fbdev code in
  98  *   fbmem.c cannot use locking asserts, and there's lots of callers which get
  99  *   the rules wrong, e.g. fbsysfs.c entirely missed fb_lock/unlock calls too.
 100  */
 101
 102 enum {
 103         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
 104         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
 105         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
 106 };
 107
 108 static struct fbcon_display fb_display[MAX_NR_CONSOLES];
 109
 110 static signed char con2fb_map[MAX_NR_CONSOLES];
 111 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
 112
 113 static int logo_lines;
 114 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 115    enums.  */
 116 static int logo_shown = FBCON_LOGO_CANSHOW;
 117 /* console mappings */
 118 static int first_fb_vc;
 119 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 120 static int fbcon_is_default = 1;
 121 static int primary_device = -1;
 122 static int fbcon_has_console_bind;
 123
 124 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
 125 static int map_override;
 126
 127 static inline void fbcon_map_override(void)
 128 {
 129         map_override = 1;
 130 }
 131 #else
 132 static inline void fbcon_map_override(void)
 133 {
 134 }
 135 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */
 136
 137 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
 138 static bool deferred_takeover = true;
 139 #else
 140 #define deferred_takeover false
 141 #endif
 142
 143 /* font data */
 144 static char fontname[40];
 145
 146 /* current fb_info */
 147 static int info_idx = -1;
 148
 149 /* console rotation */
 150 static int initial_rotation = -1;
 151 static int fbcon_has_sysfs;
 152 static int margin_color;
 153
 154 static const struct consw fb_con;
 155
 156 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 157
 158 static int fbcon_cursor_noblink;
 159
 160 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 161
 162 /*
 163  *  Interface used by the world
 164  */
 165
 166 static const char *fbcon_startup(void);
 167 static void fbcon_init(struct vc_data *vc, int init);
 168 static void fbcon_deinit(struct vc_data *vc);
 169 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 170                         int width);
 171 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
 172 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 173                         int count, int ypos, int xpos);
 174 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 175 static void fbcon_cursor(struct vc_data *vc, int mode);
 176 static int fbcon_switch(struct vc_data *vc);
 177 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
 178 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table);
 179
 180 /*
 181  *  Internal routines
 182  */
 183 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 184                            int unit);
 185 static void fbcon_modechanged(struct fb_info *info);
 186 static void fbcon_set_all_vcs(struct fb_info *info);
 187 static void fbcon_start(void);
 188 static void fbcon_exit(void);
 189 static struct device *fbcon_device;
 190
 191 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 192 static inline void fbcon_set_rotation(struct fb_info *info)
 193 {
 194         struct fbcon_ops *ops = info->fbcon_par;
 195
 196         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
 197             ops->p->con_rotate < 4)
 198                 ops->rotate = ops->p->con_rotate;
 199         else
 200                 ops->rotate = 0;
 201 }
 202
 203 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 204 {
 205         struct fbcon_ops *ops= info->fbcon_par;
 206         struct fb_info *fb_info;
 207
 208         if (!ops || ops->currcon == -1)
 209                 return;
 210
 211         fb_info = registered_fb[con2fb_map[ops->currcon]];
 212
 213         if (info == fb_info) {
 214                 struct fbcon_display *p = &fb_display[ops->currcon];
 215
 216                 if (rotate < 4)
 217                         p->con_rotate = rotate;
 218                 else
 219                         p->con_rotate = 0;
 220
 221                 fbcon_modechanged(info);
 222         }
 223 }
 224
 225 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 226 {
 227         struct fbcon_ops *ops = info->fbcon_par;
 228         struct vc_data *vc;
 229         struct fbcon_display *p;
 230         int i;
 231
 232         if (!ops || ops->currcon < 0 || rotate > 3)
 233                 return;
 234
 235         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 236                 vc = vc_cons[i].d;
 237                 if (!vc || vc->vc_mode != KD_TEXT ||
 238                     registered_fb[con2fb_map[i]] != info)
 239                         continue;
 240
 241                 p = &fb_display[vc->vc_num];
 242                 p->con_rotate = rotate;
 243         }
 244
 245         fbcon_set_all_vcs(info);
 246 }
 247 #else
 248 static inline void fbcon_set_rotation(struct fb_info *info)
 249 {
 250         struct fbcon_ops *ops = info->fbcon_par;
 251
 252         ops->rotate = FB_ROTATE_UR;
 253 }
 254
 255 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 256 {
 257         return;
 258 }
 259
 260 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 261 {
 262         return;
 263 }
 264 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 265
 266 static int fbcon_get_rotate(struct fb_info *info)
 267 {
 268         struct fbcon_ops *ops = info->fbcon_par;
 269
 270         return (ops) ? ops->rotate : 0;
 271 }
 272
 273 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 274 {
 275         struct fbcon_ops *ops = info->fbcon_par;
 276
 277         return (info->state != FBINFO_STATE_RUNNING ||
 278                 vc->vc_mode != KD_TEXT || ops->graphics);
 279 }
 280
 281 static int get_color(struct vc_data *vc, struct fb_info *info,
 282               u16 c, int is_fg)
 283 {
 284         int depth = fb_get_color_depth(&info->var, &info->fix);
 285         int color = 0;
 286
 287         if (console_blanked) {
 288                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 289
 290                 c = vc->vc_video_erase_char & charmask;
 291         }
 292
 293         if (depth != 1)
 294                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 295                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 296
 297         switch (depth) {
 298         case 1:
 299         {
 300                 int col = mono_col(info);
 301                 /* 0 or 1 */
 302                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 303                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 304
 305                 if (console_blanked)
 306                         fg = bg;
 307
 308                 color = (is_fg) ? fg : bg;
 309                 break;
 310         }
 311         case 2:
 312                 /*
 313                  * Scale down 16-colors to 4 colors. Default 4-color palette
 314                  * is grayscale. However, simply dividing the values by 4
 315                  * will not work, as colors 1, 2 and 3 will be scaled-down
 316                  * to zero rendering them invisible.  So empirically convert
 317                  * colors to a sane 4-level grayscale.
 318                  */
 319                 switch (color) {
 320                 case 0:
 321                         color = 0; /* black */
 322                         break;
 323                 case 1 ... 6:
 324                         color = 2; /* white */
 325                         break;
 326                 case 7 ... 8:
 327                         color = 1; /* gray */
 328                         break;
 329                 default:
 330                         color = 3; /* intense white */
 331                         break;
 332                 }
 333                 break;
 334         case 3:
 335                 /*
 336                  * Last 8 entries of default 16-color palette is a more intense
 337                  * version of the first 8 (i.e., same chrominance, different
 338                  * luminance).
 339                  */
 340                 color &= 7;
 341                 break;
 342         }
 343
 344
 345         return color;
 346 }
 347
 348 static void fb_flashcursor(struct work_struct *work)
 349 {
 350         struct fb_info *info = container_of(work, struct fb_info, queue);
 351         struct fbcon_ops *ops = info->fbcon_par;
 352         struct vc_data *vc = NULL;
 353         int c;
 354         int mode;
 355         int ret;
 356
 357         /* FIXME: we should sort out the unbind locking instead */
 358         /* instead we just fail to flash the cursor if we can't get
 359          * the lock instead of blocking fbcon deinit */
 360         ret = console_trylock();
 361         if (ret == 0)
 362                 return;
 363
 364         if (ops && ops->currcon != -1)
 365                 vc = vc_cons[ops->currcon].d;
 366
 367         if (!vc || !con_is_visible(vc) ||
 368             registered_fb[con2fb_map[vc->vc_num]] != info ||
 369             vc->vc_deccm != 1) {
 370                 console_unlock();
 371                 return;
 372         }
 373
 374         c = scr_readw((u16 *) vc->vc_pos);
 375         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 376                 CM_ERASE : CM_DRAW;
 377         ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
 378                     get_color(vc, info, c, 0));
 379         console_unlock();
 380 }
 381
 382 static void cursor_timer_handler(struct timer_list *t)
 383 {
 384         struct fbcon_ops *ops = from_timer(ops, t, cursor_timer);
 385         struct fb_info *info = ops->info;
 386
 387         queue_work(system_power_efficient_wq, &info->queue);
 388         mod_timer(&ops->cursor_timer, jiffies + ops->cur_blink_jiffies);
 389 }
 390
 391 static void fbcon_add_cursor_timer(struct fb_info *info)
 392 {
 393         struct fbcon_ops *ops = info->fbcon_par;
 394
 395         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
 396             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER) &&
 397             !fbcon_cursor_noblink) {
 398                 if (!info->queue.func)
 399                         INIT_WORK(&info->queue, fb_flashcursor);
 400
 401                 timer_setup(&ops->cursor_timer, cursor_timer_handler, 0);
 402                 mod_timer(&ops->cursor_timer, jiffies + ops->cur_blink_jiffies);
 403                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
 404         }
 405 }
 406
 407 static void fbcon_del_cursor_timer(struct fb_info *info)
 408 {
 409         struct fbcon_ops *ops = info->fbcon_par;
 410
 411         if (info->queue.func == fb_flashcursor &&
 412             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
 413                 del_timer_sync(&ops->cursor_timer);
 414                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
 415         }
 416 }
 417
 418 #ifndef MODULE
 419 static int __init fb_console_setup(char *this_opt)
 420 {
 421         char *options;
 422         int i, j;
 423
 424         if (!this_opt || !*this_opt)
 425                 return 1;
 426
 427         while ((options = strsep(&this_opt, ",")) != NULL) {
 428                 if (!strncmp(options, "font:", 5)) {
 429                         strlcpy(fontname, options + 5, sizeof(fontname));
 430                         continue;
 431                 }
 432
 433                 if (!strncmp(options, "scrollback:", 11)) {
 434                         pr_warn("Ignoring scrollback size option\n");
 435                         continue;
 436                 }
 437
 438                 if (!strncmp(options, "map:", 4)) {
 439                         options += 4;
 440                         if (*options) {
 441                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 442                                         if (!options[j])
 443                                                 j = 0;
 444                                         con2fb_map_boot[i] =
 445                                                 (options[j++]-'0') % FB_MAX;
 446                                 }
 447
 448                                 fbcon_map_override();
 449                         }
 450                         continue;
 451                 }
 452
 453                 if (!strncmp(options, "vc:", 3)) {
 454                         options += 3;
 455                         if (*options)
 456                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 457                         if (first_fb_vc < 0)
 458                                 first_fb_vc = 0;
 459                         if (*options++ == '-')
 460                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 461                         fbcon_is_default = 0;
 462                         continue;
 463                 }
 464
 465                 if (!strncmp(options, "rotate:", 7)) {
 466                         options += 7;
 467                         if (*options)
 468                                 initial_rotation = simple_strtoul(options, &options, 0);
 469                         if (initial_rotation > 3)
 470                                 initial_rotation = 0;
 471                         continue;
 472                 }
 473
 474                 if (!strncmp(options, "margin:", 7)) {
 475                         options += 7;
 476                         if (*options)
 477                                 margin_color = simple_strtoul(options, &options, 0);
 478                         continue;
 479                 }
 480 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
 481                 if (!strcmp(options, "nodefer")) {
 482                         deferred_takeover = false;
 483                         continue;
 484                 }
 485 #endif
 486
 487                 if (!strncmp(options, "logo-pos:", 9)) {
 488                         options += 9;
 489                         if (!strcmp(options, "center"))
 490                                 fb_center_logo = true;
 491                         continue;
 492                 }
 493
 494                 if (!strncmp(options, "logo-count:", 11)) {
 495                         options += 11;
 496                         if (*options)
 497                                 fb_logo_count = simple_strtol(options, &options, 0);
 498                         continue;
 499                 }
 500         }
 501         return 1;
 502 }
 503
 504 __setup("fbcon=", fb_console_setup);
 505 #endif
 506
 507 static int search_fb_in_map(int idx)
 508 {
 509         int i, retval = 0;
 510
 511         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 512                 if (con2fb_map[i] == idx)
 513                         retval = 1;
 514         }
 515         return retval;
 516 }
 517
 518 static int search_for_mapped_con(void)
 519 {
 520         int i, retval = 0;
 521
 522         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 523                 if (con2fb_map[i] != -1)
 524                         retval = 1;
 525         }
 526         return retval;
 527 }
 528
 529 static int do_fbcon_takeover(int show_logo)
 530 {
 531         int err, i;
 532
 533         if (!num_registered_fb)
 534                 return -ENODEV;
 535
 536         if (!show_logo)
 537                 logo_shown = FBCON_LOGO_DONTSHOW;
 538
 539         for (i = first_fb_vc; i <= last_fb_vc; i++)
 540                 con2fb_map[i] = info_idx;
 541
 542         err = do_take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 543                                 fbcon_is_default);
 544
 545         if (err) {
 546                 for (i = first_fb_vc; i <= last_fb_vc; i++)
 547                         con2fb_map[i] = -1;
 548                 info_idx = -1;
 549         } else {
 550                 fbcon_has_console_bind = 1;
 551         }
 552
 553         return err;
 554 }
 555
 556 #ifdef MODULE
 557 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 558                                int cols, int rows, int new_cols, int new_rows)
 559 {
 560         logo_shown = FBCON_LOGO_DONTSHOW;
 561 }
 562 #else
 563 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 564                                int cols, int rows, int new_cols, int new_rows)
 565 {
 566         /* Need to make room for the logo */
 567         struct fbcon_ops *ops = info->fbcon_par;
 568         int cnt, erase = vc->vc_video_erase_char, step;
 569         unsigned short *save = NULL, *r, *q;
 570         int logo_height;
 571
 572         if (info->fbops->owner) {
 573                 logo_shown = FBCON_LOGO_DONTSHOW;
 574                 return;
 575         }
 576
 577         /*
 578          * remove underline attribute from erase character
 579          * if black and white framebuffer.
 580          */
 581         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 582                 erase &= ~0x400;
 583         logo_height = fb_prepare_logo(info, ops->rotate);
 584         logo_lines = DIV_ROUND_UP(logo_height, vc->vc_font.height);
 585         q = (unsigned short *) (vc->vc_origin +
 586                                 vc->vc_size_row * rows);
 587         step = logo_lines * cols;
 588         for (r = q - logo_lines * cols; r < q; r++)
 589                 if (scr_readw(r) != vc->vc_video_erase_char)
 590                         break;
 591         if (r != q && new_rows >= rows + logo_lines) {
 592                 save = kmalloc(array3_size(logo_lines, new_cols, 2),
 593                                GFP_KERNEL);
 594                 if (save) {
 595                         int i = cols < new_cols ? cols : new_cols;
 596                         scr_memsetw(save, erase, array3_size(logo_lines, new_cols, 2));
 597                         r = q - step;
 598                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 599                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 600                         r = q;
 601                 }
 602         }
 603         if (r == q) {
 604                 /* We can scroll screen down */
 605                 r = q - step - cols;
 606                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 607                         scr_memcpyw(r + step, r, vc->vc_size_row);
 608                         r -= cols;
 609                 }
 610                 if (!save) {
 611                         int lines;
 612                         if (vc->state.y + logo_lines >= rows)
 613                                 lines = rows - vc->state.y - 1;
 614                         else
 615                                 lines = logo_lines;
 616                         vc->state.y += lines;
 617                         vc->vc_pos += lines * vc->vc_size_row;
 618                 }
 619         }
 620         scr_memsetw((unsigned short *) vc->vc_origin,
 621                     erase,
 622                     vc->vc_size_row * logo_lines);
 623
 624         if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
 625                 fbcon_clear_margins(vc, 0);
 626                 update_screen(vc);
 627         }
 628
 629         if (save) {
 630                 q = (unsigned short *) (vc->vc_origin +
 631                                         vc->vc_size_row *
 632                                         rows);
 633                 scr_memcpyw(q, save, array3_size(logo_lines, new_cols, 2));
 634                 vc->state.y += logo_lines;
 635                 vc->vc_pos += logo_lines * vc->vc_size_row;
 636                 kfree(save);
 637         }
 638
 639         if (logo_shown == FBCON_LOGO_DONTSHOW)
 640                 return;
 641
 642         if (logo_lines > vc->vc_bottom) {
 643                 logo_shown = FBCON_LOGO_CANSHOW;
 644                 printk(KERN_INFO
 645                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
 646         } else {
 647                 logo_shown = FBCON_LOGO_DRAW;
 648                 vc->vc_top = logo_lines;
 649         }
 650 }
 651 #endif /* MODULE */
 652
 653 #ifdef CONFIG_FB_TILEBLITTING
 654 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 655 {
 656         struct fbcon_ops *ops = info->fbcon_par;
 657
 658         ops->p = &fb_display[vc->vc_num];
 659
 660         if ((info->flags & FBINFO_MISC_TILEBLITTING))
 661                 fbcon_set_tileops(vc, info);
 662         else {
 663                 fbcon_set_rotation(info);
 664                 fbcon_set_bitops(ops);
 665         }
 666 }
 667
 668 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 669 {
 670         int err = 0;
 671
 672         if (info->flags & FBINFO_MISC_TILEBLITTING &&
 673             info->tileops->fb_get_tilemax(info) < charcount)
 674                 err = 1;
 675
 676         return err;
 677 }
 678 #else
 679 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 680 {
 681         struct fbcon_ops *ops = info->fbcon_par;
 682
 683         info->flags &= ~FBINFO_MISC_TILEBLITTING;
 684         ops->p = &fb_display[vc->vc_num];
 685         fbcon_set_rotation(info);
 686         fbcon_set_bitops(ops);
 687 }
 688
 689 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 690 {
 691         return 0;
 692 }
 693
 694 #endif /* CONFIG_MISC_TILEBLITTING */
 695
 696
 697 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
 698                                   int unit, int oldidx)
 699 {
 700         struct fbcon_ops *ops = NULL;
 701         int err = 0;
 702
 703         if (!try_module_get(info->fbops->owner))
 704                 err = -ENODEV;
 705
 706         if (!err && info->fbops->fb_open &&
 707             info->fbops->fb_open(info, 0))
 708                 err = -ENODEV;
 709
 710         if (!err) {
 711                 ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 712                 if (!ops)
 713                         err = -ENOMEM;
 714         }
 715
 716         if (!err) {
 717                 ops->cur_blink_jiffies = HZ / 5;
 718                 ops->info = info;
 719                 info->fbcon_par = ops;
 720
 721                 if (vc)
 722                         set_blitting_type(vc, info);
 723         }
 724
 725         if (err) {
 726                 con2fb_map[unit] = oldidx;
 727                 module_put(info->fbops->owner);
 728         }
 729
 730         return err;
 731 }
 732
 733 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 734                                   struct fb_info *newinfo, int unit,
 735                                   int oldidx, int found)
 736 {
 737         struct fbcon_ops *ops = oldinfo->fbcon_par;
 738         int err = 0, ret;
 739
 740         if (oldinfo->fbops->fb_release &&
 741             oldinfo->fbops->fb_release(oldinfo, 0)) {
 742                 con2fb_map[unit] = oldidx;
 743                 if (!found && newinfo->fbops->fb_release)
 744                         newinfo->fbops->fb_release(newinfo, 0);
 745                 if (!found)
 746                         module_put(newinfo->fbops->owner);
 747                 err = -ENODEV;
 748         }
 749
 750         if (!err) {
 751                 fbcon_del_cursor_timer(oldinfo);
 752                 kfree(ops->cursor_state.mask);
 753                 kfree(ops->cursor_data);
 754                 kfree(ops->cursor_src);
 755                 kfree(ops->fontbuffer);
 756                 kfree(oldinfo->fbcon_par);
 757                 oldinfo->fbcon_par = NULL;
 758                 module_put(oldinfo->fbops->owner);
 759                 /*
 760                   If oldinfo and newinfo are driving the same hardware,
 761                   the fb_release() method of oldinfo may attempt to
 762                   restore the hardware state.  This will leave the
 763                   newinfo in an undefined state. Thus, a call to
 764                   fb_set_par() may be needed for the newinfo.
 765                 */
 766                 if (newinfo && newinfo->fbops->fb_set_par) {
 767                         ret = newinfo->fbops->fb_set_par(newinfo);
 768
 769                         if (ret)
 770                                 printk(KERN_ERR "con2fb_release_oldinfo: "
 771                                         "detected unhandled fb_set_par error, "
 772                                         "error code %d\n", ret);
 773                 }
 774         }
 775
 776         return err;
 777 }
 778
 779 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 780                                 int unit, int show_logo)
 781 {
 782         struct fbcon_ops *ops = info->fbcon_par;
 783         int ret;
 784
 785         ops->currcon = fg_console;
 786
 787         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT)) {
 788                 ret = info->fbops->fb_set_par(info);
 789
 790                 if (ret)
 791                         printk(KERN_ERR "con2fb_init_display: detected "
 792                                 "unhandled fb_set_par error, "
 793                                 "error code %d\n", ret);
 794         }
 795
 796         ops->flags |= FBCON_FLAGS_INIT;
 797         ops->graphics = 0;
 798         fbcon_set_disp(info, &info->var, unit);
 799
 800         if (show_logo) {
 801                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 802                 struct fb_info *fg_info =
 803                         registered_fb[con2fb_map[fg_console]];
 804
 805                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 806                                    fg_vc->vc_rows, fg_vc->vc_cols,
 807                                    fg_vc->vc_rows);
 808         }
 809
 810         update_screen(vc_cons[fg_console].d);
 811 }
 812
 813 /**
 814  *      set_con2fb_map - map console to frame buffer device
 815  *      @unit: virtual console number to map
 816  *      @newidx: frame buffer index to map virtual console to
 817  *      @user: user request
 818  *
 819  *      Maps a virtual console @unit to a frame buffer device
 820  *      @newidx.
 821  *
 822  *      This should be called with the console lock held.
 823  */
 824 static int set_con2fb_map(int unit, int newidx, int user)
 825 {
 826         struct vc_data *vc = vc_cons[unit].d;
 827         int oldidx = con2fb_map[unit];
 828         struct fb_info *info = registered_fb[newidx];
 829         struct fb_info *oldinfo = NULL;
 830         int found, err = 0;
 831
 832         WARN_CONSOLE_UNLOCKED();
 833
 834         if (oldidx == newidx)
 835                 return 0;
 836
 837         if (!info)
 838                 return -EINVAL;
 839
 840         if (!search_for_mapped_con() || !con_is_bound(&fb_con)) {
 841                 info_idx = newidx;
 842                 return do_fbcon_takeover(0);
 843         }
 844
 845         if (oldidx != -1)
 846                 oldinfo = registered_fb[oldidx];
 847
 848         found = search_fb_in_map(newidx);
 849
 850         con2fb_map[unit] = newidx;
 851         if (!err && !found)
 852                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 853
 854         /*
 855          * If old fb is not mapped to any of the consoles,
 856          * fbcon should release it.
 857          */
 858         if (!err && oldinfo && !search_fb_in_map(oldidx))
 859                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 860                                              found);
 861
 862         if (!err) {
 863                 int show_logo = (fg_console == 0 && !user &&
 864                                  logo_shown != FBCON_LOGO_DONTSHOW);
 865
 866                 if (!found)
 867                         fbcon_add_cursor_timer(info);
 868                 con2fb_map_boot[unit] = newidx;
 869                 con2fb_init_display(vc, info, unit, show_logo);
 870         }
 871
 872         if (!search_fb_in_map(info_idx))
 873                 info_idx = newidx;
 874
 875         return err;
 876 }
 877
 878 /*
 879  *  Low Level Operations
 880  */
 881 /* NOTE: fbcon cannot be __init: it may be called from do_take_over_console later */
 882 static int var_to_display(struct fbcon_display *disp,
 883                           struct fb_var_screeninfo *var,
 884                           struct fb_info *info)
 885 {
 886         disp->xres_virtual = var->xres_virtual;
 887         disp->yres_virtual = var->yres_virtual;
 888         disp->bits_per_pixel = var->bits_per_pixel;
 889         disp->grayscale = var->grayscale;
 890         disp->nonstd = var->nonstd;
 891         disp->accel_flags = var->accel_flags;
 892         disp->height = var->height;
 893         disp->width = var->width;
 894         disp->red = var->red;
 895         disp->green = var->green;
 896         disp->blue = var->blue;
 897         disp->transp = var->transp;
 898         disp->rotate = var->rotate;
 899         disp->mode = fb_match_mode(var, &info->modelist);
 900         if (disp->mode == NULL)
 901                 /* This should not happen */
 902                 return -EINVAL;
 903         return 0;
 904 }
 905
 906 static void display_to_var(struct fb_var_screeninfo *var,
 907                            struct fbcon_display *disp)
 908 {
 909         fb_videomode_to_var(var, disp->mode);
 910         var->xres_virtual = disp->xres_virtual;
 911         var->yres_virtual = disp->yres_virtual;
 912         var->bits_per_pixel = disp->bits_per_pixel;
 913         var->grayscale = disp->grayscale;
 914         var->nonstd = disp->nonstd;
 915         var->accel_flags = disp->accel_flags;
 916         var->height = disp->height;
 917         var->width = disp->width;
 918         var->red = disp->red;
 919         var->green = disp->green;
 920         var->blue = disp->blue;
 921         var->transp = disp->transp;
 922         var->rotate = disp->rotate;
 923 }
 924
 925 static const char *fbcon_startup(void)
 926 {
 927         const char *display_desc = "frame buffer device";
 928         struct fbcon_display *p = &fb_display[fg_console];
 929         struct vc_data *vc = vc_cons[fg_console].d;
 930         const struct font_desc *font = NULL;
 931         struct module *owner;
 932         struct fb_info *info = NULL;
 933         struct fbcon_ops *ops;
 934         int rows, cols;
 935
 936         /*
 937          *  If num_registered_fb is zero, this is a call for the dummy part.
 938          *  The frame buffer devices weren't initialized yet.
 939          */
 940         if (!num_registered_fb || info_idx == -1)
 941                 return display_desc;
 942         /*
 943          * Instead of blindly using registered_fb[0], we use info_idx, set by
 944          * fb_console_init();
 945          */
 946         info = registered_fb[info_idx];
 947         if (!info)
 948                 return NULL;
 949
 950         owner = info->fbops->owner;
 951         if (!try_module_get(owner))
 952                 return NULL;
 953         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 954                 module_put(owner);
 955                 return NULL;
 956         }
 957
 958         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 959         if (!ops) {
 960                 module_put(owner);
 961                 return NULL;
 962         }
 963
 964         ops->currcon = -1;
 965         ops->graphics = 1;
 966         ops->cur_rotate = -1;
 967         ops->cur_blink_jiffies = HZ / 5;
 968         ops->info = info;
 969         info->fbcon_par = ops;
 970
 971         p->con_rotate = initial_rotation;
 972         if (p->con_rotate == -1)
 973                 p->con_rotate = info->fbcon_rotate_hint;
 974         if (p->con_rotate == -1)
 975                 p->con_rotate = FB_ROTATE_UR;
 976
 977         set_blitting_type(vc, info);
 978
 979         /* Setup default font */
 980         if (!p->fontdata && !vc->vc_font.data) {
 981                 if (!fontname[0] || !(font = find_font(fontname)))
 982                         font = get_default_font(info->var.xres,
 983                                                 info->var.yres,
 984                                                 info->pixmap.blit_x,
 985                                                 info->pixmap.blit_y);
 986                 vc->vc_font.width = font->width;
 987                 vc->vc_font.height = font->height;
 988                 vc->vc_font.data = (void *)(p->fontdata = font->data);
 989                 vc->vc_font.charcount = font->charcount;
 990         } else {
 991                 p->fontdata = vc->vc_font.data;
 992         }
 993
 994         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
 995         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
 996         cols /= vc->vc_font.width;
 997         rows /= vc->vc_font.height;
 998         vc_resize(vc, cols, rows);
 999
1000         pr_debug("mode:   %s\n", info->fix.id);
1001         pr_debug("visual: %d\n", info->fix.visual);
1002         pr_debug("res:    %dx%d-%d\n", info->var.xres,
1003                  info->var.yres,
1004                  info->var.bits_per_pixel);
1005
1006         fbcon_add_cursor_timer(info);
1007         return display_desc;
1008 }
1009
1010 static void fbcon_init(struct vc_data *vc, int init)
1011 {
1012         struct fb_info *info;
1013         struct fbcon_ops *ops;
1014         struct vc_data **default_mode = vc->vc_display_fg;
1015         struct vc_data *svc = *default_mode;
1016         struct fbcon_display *t, *p = &fb_display[vc->vc_num];
1017         int logo = 1, new_rows, new_cols, rows, cols;
1018         int ret;
1019
1020         if (WARN_ON(info_idx == -1))
1021             return;
1022
1023         if (con2fb_map[vc->vc_num] == -1)
1024                 con2fb_map[vc->vc_num] = info_idx;
1025
1026         info = registered_fb[con2fb_map[vc->vc_num]];
1027
1028         if (logo_shown < 0 && console_loglevel <= CONSOLE_LOGLEVEL_QUIET)
1029                 logo_shown = FBCON_LOGO_DONTSHOW;
1030
1031         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1032             (info->fix.type == FB_TYPE_TEXT))
1033                 logo = 0;
1034
1035         if (var_to_display(p, &info->var, info))
1036                 return;
1037
1038         if (!info->fbcon_par)
1039                 con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);
1040
1041         /* If we are not the first console on this
1042            fb, copy the font from that console */
1043         t = &fb_display[fg_console];
1044         if (!p->fontdata) {
1045                 if (t->fontdata) {
1046                         struct vc_data *fvc = vc_cons[fg_console].d;
1047
1048                         vc->vc_font.data = (void *)(p->fontdata =
1049                                                     fvc->vc_font.data);
1050                         vc->vc_font.width = fvc->vc_font.width;
1051                         vc->vc_font.height = fvc->vc_font.height;
1052                         vc->vc_font.charcount = fvc->vc_font.charcount;
1053                         p->userfont = t->userfont;
1054
1055                         if (p->userfont)
1056                                 REFCOUNT(p->fontdata)++;
1057                 } else {
1058                         const struct font_desc *font = NULL;
1059
1060                         if (!fontname[0] || !(font = find_font(fontname)))
1061                                 font = get_default_font(info->var.xres,
1062                                                         info->var.yres,
1063                                                         info->pixmap.blit_x,
1064                                                         info->pixmap.blit_y);
1065                         vc->vc_font.width = font->width;
1066                         vc->vc_font.height = font->height;
1067                         vc->vc_font.data = (void *)(p->fontdata = font->data);
1068                         vc->vc_font.charcount = font->charcount;
1069                 }
1070         }
1071
1072         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1073         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1074         if (vc->vc_font.charcount == 256) {
1075                 vc->vc_hi_font_mask = 0;
1076         } else {
1077                 vc->vc_hi_font_mask = 0x100;
1078                 if (vc->vc_can_do_color)
1079                         vc->vc_complement_mask <<= 1;
1080         }
1081
1082         if (!*svc->vc_uni_pagedir_loc)
1083                 con_set_default_unimap(svc);
1084         if (!*vc->vc_uni_pagedir_loc)
1085                 con_copy_unimap(vc, svc);
1086
1087         ops = info->fbcon_par;
1088         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1089
1090         p->con_rotate = initial_rotation;
1091         if (p->con_rotate == -1)
1092                 p->con_rotate = info->fbcon_rotate_hint;
1093         if (p->con_rotate == -1)
1094                 p->con_rotate = FB_ROTATE_UR;
1095
1096         set_blitting_type(vc, info);
1097
1098         cols = vc->vc_cols;
1099         rows = vc->vc_rows;
1100         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1101         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1102         new_cols /= vc->vc_font.width;
1103         new_rows /= vc->vc_font.height;
1104
1105         /*
1106          * We must always set the mode. The mode of the previous console
1107          * driver could be in the same resolution but we are using different
1108          * hardware so we have to initialize the hardware.
1109          *
1110          * We need to do it in fbcon_init() to prevent screen corruption.
1111          */
1112         if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
1113                 if (info->fbops->fb_set_par &&
1114                     !(ops->flags & FBCON_FLAGS_INIT)) {
1115                         ret = info->fbops->fb_set_par(info);
1116
1117                         if (ret)
1118                                 printk(KERN_ERR "fbcon_init: detected "
1119                                         "unhandled fb_set_par error, "
1120                                         "error code %d\n", ret);
1121                 }
1122
1123                 ops->flags |= FBCON_FLAGS_INIT;
1124         }
1125
1126         ops->graphics = 0;
1127
1128         /*
1129          *  ++guenther: console.c:vc_allocate() relies on initializing
1130          *  vc_{cols,rows}, but we must not set those if we are only
1131          *  resizing the console.
1132          */
1133         if (init) {
1134                 vc->vc_cols = new_cols;
1135                 vc->vc_rows = new_rows;
1136         } else
1137                 vc_resize(vc, new_cols, new_rows);
1138
1139         if (logo)
1140                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1141
1142         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1143                 ops->rotate = FB_ROTATE_UR;
1144                 set_blitting_type(vc, info);
1145         }
1146
1147         ops->p = &fb_display[fg_console];
1148 }
1149
1150 static void fbcon_free_font(struct fbcon_display *p, bool freefont)
1151 {
1152         if (freefont && p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
1153                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
1154         p->fontdata = NULL;
1155         p->userfont = 0;
1156 }
1157
1158 static void set_vc_hi_font(struct vc_data *vc, bool set);
1159
1160 static void fbcon_deinit(struct vc_data *vc)
1161 {
1162         struct fbcon_display *p = &fb_display[vc->vc_num];
1163         struct fb_info *info;
1164         struct fbcon_ops *ops;
1165         int idx;
1166         bool free_font = true;
1167
1168         idx = con2fb_map[vc->vc_num];
1169
1170         if (idx == -1)
1171                 goto finished;
1172
1173         info = registered_fb[idx];
1174
1175         if (!info)
1176                 goto finished;
1177
1178         if (info->flags & FBINFO_MISC_FIRMWARE)
1179                 free_font = false;
1180         ops = info->fbcon_par;
1181
1182         if (!ops)
1183                 goto finished;
1184
1185         if (con_is_visible(vc))
1186                 fbcon_del_cursor_timer(info);
1187
1188         ops->flags &= ~FBCON_FLAGS_INIT;
1189 finished:
1190
1191         fbcon_free_font(p, free_font);
1192         if (free_font)
1193                 vc->vc_font.data = NULL;
1194
1195         if (vc->vc_hi_font_mask && vc->vc_screenbuf)
1196                 set_vc_hi_font(vc, false);
1197
1198         if (!con_is_bound(&fb_con))
1199                 fbcon_exit();
1200
1201         if (vc->vc_num == logo_shown)
1202                 logo_shown = FBCON_LOGO_CANSHOW;
1203
1204         return;
1205 }
1206
1207 /* ====================================================================== */
1208
1209 /*  fbcon_XXX routines - interface used by the world
1210  *
1211  *  This system is now divided into two levels because of complications
1212  *  caused by hardware scrolling. Top level functions:
1213  *
1214  *      fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1215  *
1216  *  handles y values in range [0, scr_height-1] that correspond to real
1217  *  screen positions. y_wrap shift means that first line of bitmap may be
1218  *  anywhere on this display. These functions convert lineoffsets to
1219  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1220  *
1221  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1222  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1223  *
1224  *  WARNING:
1225  *
1226  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1227  *  Implies should only really hardware scroll in rows. Only reason for
1228  *  restriction is simplicity & efficiency at the moment.
1229  */
1230
1231 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1232                         int width)
1233 {
1234         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1235         struct fbcon_ops *ops = info->fbcon_par;
1236
1237         struct fbcon_display *p = &fb_display[vc->vc_num];
1238         u_int y_break;
1239
1240         if (fbcon_is_inactive(vc, info))
1241                 return;
1242
1243         if (!height || !width)
1244                 return;
1245
1246         if (sy < vc->vc_top && vc->vc_top == logo_lines) {
1247                 vc->vc_top = 0;
1248                 /*
1249                  * If the font dimensions are not an integral of the display
1250                  * dimensions then the ops->clear below won't end up clearing
1251                  * the margins.  Call clear_margins here in case the logo
1252                  * bitmap stretched into the margin area.
1253                  */
1254                 fbcon_clear_margins(vc, 0);
1255         }
1256
1257         /* Split blits that cross physical y_wrap boundary */
1258
1259         y_break = p->vrows - p->yscroll;
1260         if (sy < y_break && sy + height - 1 >= y_break) {
1261                 u_int b = y_break - sy;
1262                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1263                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1264                                  width);
1265         } else
1266                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1267 }
1268
1269 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1270                         int count, int ypos, int xpos)
1271 {
1272         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1273         struct fbcon_display *p = &fb_display[vc->vc_num];
1274         struct fbcon_ops *ops = info->fbcon_par;
1275
1276         if (!fbcon_is_inactive(vc, info))
1277                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1278                            get_color(vc, info, scr_readw(s), 1),
1279                            get_color(vc, info, scr_readw(s), 0));
1280 }
1281
1282 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1283 {
1284         unsigned short chr;
1285
1286         scr_writew(c, &chr);
1287         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1288 }
1289
1290 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1291 {
1292         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1293         struct fbcon_ops *ops = info->fbcon_par;
1294
1295         if (!fbcon_is_inactive(vc, info))
1296                 ops->clear_margins(vc, info, margin_color, bottom_only);
1297 }
1298
1299 static void fbcon_cursor(struct vc_data *vc, int mode)
1300 {
1301         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1302         struct fbcon_ops *ops = info->fbcon_par;
1303         int c = scr_readw((u16 *) vc->vc_pos);
1304
1305         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1306
1307         if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
1308                 return;
1309
1310         if (vc->vc_cursor_type & CUR_SW)
1311                 fbcon_del_cursor_timer(info);
1312         else
1313                 fbcon_add_cursor_timer(info);
1314
1315         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1316
1317         if (!ops->cursor)
1318                 return;
1319
1320         ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
1321                     get_color(vc, info, c, 0));
1322 }
1323
1324 static int scrollback_phys_max = 0;
1325 static int scrollback_max = 0;
1326 static int scrollback_current = 0;
1327
1328 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1329                            int unit)
1330 {
1331         struct fbcon_display *p, *t;
1332         struct vc_data **default_mode, *vc;
1333         struct vc_data *svc;
1334         struct fbcon_ops *ops = info->fbcon_par;
1335         int rows, cols;
1336
1337         p = &fb_display[unit];
1338
1339         if (var_to_display(p, var, info))
1340                 return;
1341
1342         vc = vc_cons[unit].d;
1343
1344         if (!vc)
1345                 return;
1346
1347         default_mode = vc->vc_display_fg;
1348         svc = *default_mode;
1349         t = &fb_display[svc->vc_num];
1350
1351         if (!vc->vc_font.data) {
1352                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1353                 vc->vc_font.width = (*default_mode)->vc_font.width;
1354                 vc->vc_font.height = (*default_mode)->vc_font.height;
1355                 vc->vc_font.charcount = (*default_mode)->vc_font.charcount;
1356                 p->userfont = t->userfont;
1357                 if (p->userfont)
1358                         REFCOUNT(p->fontdata)++;
1359         }
1360
1361         var->activate = FB_ACTIVATE_NOW;
1362         info->var.activate = var->activate;
1363         var->yoffset = info->var.yoffset;
1364         var->xoffset = info->var.xoffset;
1365         fb_set_var(info, var);
1366         ops->var = info->var;
1367         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1368         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1369         if (vc->vc_font.charcount == 256) {
1370                 vc->vc_hi_font_mask = 0;
1371         } else {
1372                 vc->vc_hi_font_mask = 0x100;
1373                 if (vc->vc_can_do_color)
1374                         vc->vc_complement_mask <<= 1;
1375         }
1376
1377         if (!*svc->vc_uni_pagedir_loc)
1378                 con_set_default_unimap(svc);
1379         if (!*vc->vc_uni_pagedir_loc)
1380                 con_copy_unimap(vc, svc);
1381
1382         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1383         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1384         cols /= vc->vc_font.width;
1385         rows /= vc->vc_font.height;
1386         vc_resize(vc, cols, rows);
1387
1388         if (con_is_visible(vc)) {
1389                 update_screen(vc);
1390         }
1391 }
1392
1393 static void fbcon_redraw(struct vc_data *vc, struct fbcon_display *p,
1394                          int line, int count, int offset)
1395 {
1396         unsigned short *d = (unsigned short *)
1397             (vc->vc_origin + vc->vc_size_row * line);
1398         unsigned short *s = d + offset;
1399
1400         while (count--) {
1401                 unsigned short *start = s;
1402                 unsigned short *le = advance_row(s, 1);
1403                 unsigned short c;
1404                 int x = 0;
1405                 unsigned short attr = 1;
1406
1407                 do {
1408                         c = scr_readw(s);
1409                         if (attr != (c & 0xff00)) {
1410                                 attr = c & 0xff00;
1411                                 if (s > start) {
1412                                         fbcon_putcs(vc, start, s - start,
1413                                                     line, x);
1414                                         x += s - start;
1415                                         start = s;
1416                                 }
1417                         }
1418                         if (c == scr_readw(d)) {
1419                                 if (s > start) {
1420                                         fbcon_putcs(vc, start, s - start,
1421                                                      line, x);
1422                                         x += s - start + 1;
1423                                         start = s + 1;
1424                                 } else {
1425                                         x++;
1426                                         start++;
1427                                 }
1428                         }
1429                         scr_writew(c, d);
1430                         console_conditional_schedule();
1431                         s++;
1432                         d++;
1433                 } while (s < le);
1434                 if (s > start)
1435                         fbcon_putcs(vc, start, s - start, line, x);
1436                 console_conditional_schedule();
1437                 if (offset > 0)
1438                         line++;
1439                 else {
1440                         line--;
1441                         /* NOTE: We subtract two lines from these pointers */
1442                         s -= vc->vc_size_row;
1443                         d -= vc->vc_size_row;
1444                 }
1445         }
1446 }
1447
1448 static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
1449                 enum con_scroll dir, unsigned int count)
1450 {
1451         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1452         struct fbcon_display *p = &fb_display[vc->vc_num];
1453
1454         if (fbcon_is_inactive(vc, info))
1455                 return true;
1456
1457         fbcon_cursor(vc, CM_ERASE);
1458
1459         /*
1460          * ++Geert: Only use ywrap/ypan if the console is in text mode
1461          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1462          *           whole screen (prevents flicker).
1463          */
1464
1465         switch (dir) {
1466         case SM_UP:
1467                 if (count > vc->vc_rows)        /* Maximum realistic size */
1468                         count = vc->vc_rows;
1469                 fbcon_redraw(vc, p, t, b - t - count,
1470                              count * vc->vc_cols);
1471                 fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1472                 scr_memsetw((unsigned short *) (vc->vc_origin +
1473                                                 vc->vc_size_row *
1474                                                 (b - count)),
1475                             vc->vc_video_erase_char,
1476                             vc->vc_size_row * count);
1477                 return true;
1478
1479         case SM_DOWN:
1480                 if (count > vc->vc_rows)        /* Maximum realistic size */
1481                         count = vc->vc_rows;
1482                 fbcon_redraw(vc, p, b - 1, b - t - count,
1483                              -count * vc->vc_cols);
1484                 fbcon_clear(vc, t, 0, count, vc->vc_cols);
1485                 scr_memsetw((unsigned short *) (vc->vc_origin +
1486                                                 vc->vc_size_row *
1487                                                 t),
1488                             vc->vc_video_erase_char,
1489                             vc->vc_size_row * count);
1490                 return true;
1491         }
1492         return false;
1493 }
1494
1495 static void updatescrollmode(struct fbcon_display *p,
1496                                         struct fb_info *info,
1497                                         struct vc_data *vc)
1498 {
1499         struct fbcon_ops *ops = info->fbcon_par;
1500         int fh = vc->vc_font.height;
1501         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1502         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1503                                    info->var.xres_virtual);
1504
1505         p->vrows = vyres/fh;
1506         if (yres > (fh * (vc->vc_rows + 1)))
1507                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
1508         if ((yres % fh) && (vyres % fh < yres % fh))
1509                 p->vrows--;
1510 }
1511
1512 #define PITCH(w) (((w) + 7) >> 3)
1513 #define CALC_FONTSZ(h, p, c) ((h) * (p) * (c)) /* size = height * pitch * charcount */
1514
1515 static int fbcon_resize(struct vc_data *vc, unsigned int width,
1516                         unsigned int height, unsigned int user)
1517 {
1518         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1519         struct fbcon_ops *ops = info->fbcon_par;
1520         struct fbcon_display *p = &fb_display[vc->vc_num];
1521         struct fb_var_screeninfo var = info->var;
1522         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
1523
1524         if (p->userfont && FNTSIZE(vc->vc_font.data)) {
1525                 int size;
1526                 int pitch = PITCH(vc->vc_font.width);
1527
1528                 /*
1529                  * If user font, ensure that a possible change to user font
1530                  * height or width will not allow a font data out-of-bounds access.
1531                  * NOTE: must use original charcount in calculation as font
1532                  * charcount can change and cannot be used to determine the
1533                  * font data allocated size.
1534                  */
1535                 if (pitch <= 0)
1536                         return -EINVAL;
1537                 size = CALC_FONTSZ(vc->vc_font.height, pitch, vc->vc_font.charcount);
1538                 if (size > FNTSIZE(vc->vc_font.data))
1539                         return -EINVAL;
1540         }
1541
1542         virt_w = FBCON_SWAP(ops->rotate, width, height);
1543         virt_h = FBCON_SWAP(ops->rotate, height, width);
1544         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
1545                                  vc->vc_font.height);
1546         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
1547                                  vc->vc_font.width);
1548         var.xres = virt_w * virt_fw;
1549         var.yres = virt_h * virt_fh;
1550         x_diff = info->var.xres - var.xres;
1551         y_diff = info->var.yres - var.yres;
1552         if (x_diff < 0 || x_diff > virt_fw ||
1553             y_diff < 0 || y_diff > virt_fh) {
1554                 const struct fb_videomode *mode;
1555
1556                 pr_debug("attempting resize %ix%i\n", var.xres, var.yres);
1557                 mode = fb_find_best_mode(&var, &info->modelist);
1558                 if (mode == NULL)
1559                         return -EINVAL;
1560                 display_to_var(&var, p);
1561                 fb_videomode_to_var(&var, mode);
1562
1563                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
1564                         return -EINVAL;
1565
1566                 pr_debug("resize now %ix%i\n", var.xres, var.yres);
1567                 if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
1568                         var.activate = FB_ACTIVATE_NOW |
1569                                 FB_ACTIVATE_FORCE;
1570                         fb_set_var(info, &var);
1571                 }
1572                 var_to_display(p, &info->var, info);
1573                 ops->var = info->var;
1574         }
1575         updatescrollmode(p, info, vc);
1576         return 0;
1577 }
1578
1579 static int fbcon_switch(struct vc_data *vc)
1580 {
1581         struct fb_info *info, *old_info = NULL;
1582         struct fbcon_ops *ops;
1583         struct fbcon_display *p = &fb_display[vc->vc_num];
1584         struct fb_var_screeninfo var;
1585         int i, ret, prev_console;
1586
1587         info = registered_fb[con2fb_map[vc->vc_num]];
1588         ops = info->fbcon_par;
1589
1590         if (logo_shown >= 0) {
1591                 struct vc_data *conp2 = vc_cons[logo_shown].d;
1592
1593                 if (conp2->vc_top == logo_lines
1594                     && conp2->vc_bottom == conp2->vc_rows)
1595                         conp2->vc_top = 0;
1596                 logo_shown = FBCON_LOGO_CANSHOW;
1597         }
1598
1599         prev_console = ops->currcon;
1600         if (prev_console != -1)
1601                 old_info = registered_fb[con2fb_map[prev_console]];
1602         /*
1603          * FIXME: If we have multiple fbdev's loaded, we need to
1604          * update all info->currcon.  Perhaps, we can place this
1605          * in a centralized structure, but this might break some
1606          * drivers.
1607          *
1608          * info->currcon = vc->vc_num;
1609          */
1610         for_each_registered_fb(i) {
1611                 if (registered_fb[i]->fbcon_par) {
1612                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
1613
1614                         o->currcon = vc->vc_num;
1615                 }
1616         }
1617         memset(&var, 0, sizeof(struct fb_var_screeninfo));
1618         display_to_var(&var, p);
1619         var.activate = FB_ACTIVATE_NOW;
1620
1621         /*
1622          * make sure we don't unnecessarily trip the memcmp()
1623          * in fb_set_var()
1624          */
1625         info->var.activate = var.activate;
1626         var.vmode |= info->var.vmode & ~FB_VMODE_MASK;
1627         fb_set_var(info, &var);
1628         ops->var = info->var;
1629
1630         if (old_info != NULL && (old_info != info ||
1631                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
1632                 if (info->fbops->fb_set_par) {
1633                         ret = info->fbops->fb_set_par(info);
1634
1635                         if (ret)
1636                                 printk(KERN_ERR "fbcon_switch: detected "
1637                                         "unhandled fb_set_par error, "
1638                                         "error code %d\n", ret);
1639                 }
1640
1641                 if (old_info != info)
1642                         fbcon_del_cursor_timer(old_info);
1643         }
1644
1645         if (fbcon_is_inactive(vc, info) ||
1646             ops->blank_state != FB_BLANK_UNBLANK)
1647                 fbcon_del_cursor_timer(info);
1648         else
1649                 fbcon_add_cursor_timer(info);
1650
1651         set_blitting_type(vc, info);
1652         ops->cursor_reset = 1;
1653
1654         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1655                 ops->rotate = FB_ROTATE_UR;
1656                 set_blitting_type(vc, info);
1657         }
1658
1659         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1660         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1661
1662         if (vc->vc_font.charcount > 256)
1663                 vc->vc_complement_mask <<= 1;
1664
1665         updatescrollmode(p, info, vc);
1666
1667         scrollback_phys_max = 0;
1668         scrollback_max = 0;
1669         scrollback_current = 0;
1670
1671         if (!fbcon_is_inactive(vc, info)) {
1672             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
1673             ops->update_start(info);
1674         }
1675
1676         fbcon_set_palette(vc, color_table);
1677         fbcon_clear_margins(vc, 0);
1678
1679         if (logo_shown == FBCON_LOGO_DRAW) {
1680
1681                 logo_shown = fg_console;
1682                 /* This is protected above by initmem_freed */
1683                 fb_show_logo(info, ops->rotate);
1684                 update_region(vc,
1685                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
1686                               vc->vc_size_row * (vc->vc_bottom -
1687                                                  vc->vc_top) / 2);
1688                 return 0;
1689         }
1690         return 1;
1691 }
1692
1693 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
1694                                 int blank)
1695 {
1696         if (blank) {
1697                 unsigned short charmask = vc->vc_hi_font_mask ?
1698                         0x1ff : 0xff;
1699                 unsigned short oldc;
1700
1701                 oldc = vc->vc_video_erase_char;
1702                 vc->vc_video_erase_char &= charmask;
1703                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
1704                 vc->vc_video_erase_char = oldc;
1705         }
1706 }
1707
1708 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
1709 {
1710         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1711         struct fbcon_ops *ops = info->fbcon_par;
1712
1713         if (mode_switch) {
1714                 struct fb_var_screeninfo var = info->var;
1715
1716                 ops->graphics = 1;
1717
1718                 if (!blank) {
1719                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE |
1720                                 FB_ACTIVATE_KD_TEXT;
1721                         fb_set_var(info, &var);
1722                         ops->graphics = 0;
1723                         ops->var = info->var;
1724                 }
1725         }
1726
1727         if (!fbcon_is_inactive(vc, info)) {
1728                 if (ops->blank_state != blank) {
1729                         ops->blank_state = blank;
1730                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
1731                         ops->cursor_flash = (!blank);
1732
1733                         if (fb_blank(info, blank))
1734                                 fbcon_generic_blank(vc, info, blank);
1735                 }
1736
1737                 if (!blank)
1738                         update_screen(vc);
1739         }
1740
1741         if (mode_switch || fbcon_is_inactive(vc, info) ||
1742             ops->blank_state != FB_BLANK_UNBLANK)
1743                 fbcon_del_cursor_timer(info);
1744         else
1745                 fbcon_add_cursor_timer(info);
1746
1747         return 0;
1748 }
1749
1750 static int fbcon_debug_enter(struct vc_data *vc)
1751 {
1752         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1753         struct fbcon_ops *ops = info->fbcon_par;
1754
1755         ops->save_graphics = ops->graphics;
1756         ops->graphics = 0;
1757         if (info->fbops->fb_debug_enter)
1758                 info->fbops->fb_debug_enter(info);
1759         fbcon_set_palette(vc, color_table);
1760         return 0;
1761 }
1762
1763 static int fbcon_debug_leave(struct vc_data *vc)
1764 {
1765         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1766         struct fbcon_ops *ops = info->fbcon_par;
1767
1768         ops->graphics = ops->save_graphics;
1769         if (info->fbops->fb_debug_leave)
1770                 info->fbops->fb_debug_leave(info);
1771         return 0;
1772 }
1773
1774 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
1775 {
1776         u8 *fontdata = vc->vc_font.data;
1777         u8 *data = font->data;
1778         int i, j;
1779
1780         font->width = vc->vc_font.width;
1781         font->height = vc->vc_font.height;
1782         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
1783         if (!font->data)
1784                 return 0;
1785
1786         if (font->width <= 8) {
1787                 j = vc->vc_font.height;
1788                 if (font->charcount * j > FNTSIZE(fontdata))
1789                         return -EINVAL;
1790
1791                 for (i = 0; i < font->charcount; i++) {
1792                         memcpy(data, fontdata, j);
1793                         memset(data + j, 0, 32 - j);
1794                         data += 32;
1795                         fontdata += j;
1796                 }
1797         } else if (font->width <= 16) {
1798                 j = vc->vc_font.height * 2;
1799                 if (font->charcount * j > FNTSIZE(fontdata))
1800                         return -EINVAL;
1801
1802                 for (i = 0; i < font->charcount; i++) {
1803                         memcpy(data, fontdata, j);
1804                         memset(data + j, 0, 64 - j);
1805                         data += 64;
1806                         fontdata += j;
1807                 }
1808         } else if (font->width <= 24) {
1809                 if (font->charcount * (vc->vc_font.height * sizeof(u32)) > FNTSIZE(fontdata))
1810                         return -EINVAL;
1811
1812                 for (i = 0; i < font->charcount; i++) {
1813                         for (j = 0; j < vc->vc_font.height; j++) {
1814                                 *data++ = fontdata[0];
1815                                 *data++ = fontdata[1];
1816                                 *data++ = fontdata[2];
1817                                 fontdata += sizeof(u32);
1818                         }
1819                         memset(data, 0, 3 * (32 - j));
1820                         data += 3 * (32 - j);
1821                 }
1822         } else {
1823                 j = vc->vc_font.height * 4;
1824                 if (font->charcount * j > FNTSIZE(fontdata))
1825                         return -EINVAL;
1826
1827                 for (i = 0; i < font->charcount; i++) {
1828                         memcpy(data, fontdata, j);
1829                         memset(data + j, 0, 128 - j);
1830                         data += 128;
1831                         fontdata += j;
1832                 }
1833         }
1834         return 0;
1835 }
1836
1837 /* set/clear vc_hi_font_mask and update vc attrs accordingly */
1838 static void set_vc_hi_font(struct vc_data *vc, bool set)
1839 {
1840         if (!set) {
1841                 vc->vc_hi_font_mask = 0;
1842                 if (vc->vc_can_do_color) {
1843                         vc->vc_complement_mask >>= 1;
1844                         vc->vc_s_complement_mask >>= 1;
1845                 }
1846
1847                 /* ++Edmund: reorder the attribute bits */
1848                 if (vc->vc_can_do_color) {
1849                         unsigned short *cp =
1850                             (unsigned short *) vc->vc_origin;
1851                         int count = vc->vc_screenbuf_size / 2;
1852                         unsigned short c;
1853                         for (; count > 0; count--, cp++) {
1854                                 c = scr_readw(cp);
1855                                 scr_writew(((c & 0xfe00) >> 1) |
1856                                            (c & 0xff), cp);
1857                         }
1858                         c = vc->vc_video_erase_char;
1859                         vc->vc_video_erase_char =
1860                             ((c & 0xfe00) >> 1) | (c & 0xff);
1861                         vc->vc_attr >>= 1;
1862                 }
1863         } else {
1864                 vc->vc_hi_font_mask = 0x100;
1865                 if (vc->vc_can_do_color) {
1866                         vc->vc_complement_mask <<= 1;
1867                         vc->vc_s_complement_mask <<= 1;
1868                 }
1869
1870                 /* ++Edmund: reorder the attribute bits */
1871                 {
1872                         unsigned short *cp =
1873                             (unsigned short *) vc->vc_origin;
1874                         int count = vc->vc_screenbuf_size / 2;
1875                         unsigned short c;
1876                         for (; count > 0; count--, cp++) {
1877                                 unsigned short newc;
1878                                 c = scr_readw(cp);
1879                                 if (vc->vc_can_do_color)
1880                                         newc =
1881                                             ((c & 0xff00) << 1) | (c &
1882                                                                    0xff);
1883                                 else
1884                                         newc = c & ~0x100;
1885                                 scr_writew(newc, cp);
1886                         }
1887                         c = vc->vc_video_erase_char;
1888                         if (vc->vc_can_do_color) {
1889                                 vc->vc_video_erase_char =
1890                                     ((c & 0xff00) << 1) | (c & 0xff);
1891                                 vc->vc_attr <<= 1;
1892                         } else
1893                                 vc->vc_video_erase_char = c & ~0x100;
1894                 }
1895         }
1896 }
1897
1898 static int fbcon_do_set_font(struct vc_data *vc, int w, int h, int charcount,
1899                              const u8 * data, int userfont)
1900 {
1901         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1902         struct fbcon_ops *ops = info->fbcon_par;
1903         struct fbcon_display *p = &fb_display[vc->vc_num];
1904         int resize;
1905         char *old_data = NULL;
1906
1907         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
1908         if (p->userfont)
1909                 old_data = vc->vc_font.data;
1910         vc->vc_font.data = (void *)(p->fontdata = data);
1911         if ((p->userfont = userfont))
1912                 REFCOUNT(data)++;
1913         vc->vc_font.width = w;
1914         vc->vc_font.height = h;
1915         vc->vc_font.charcount = charcount;
1916         if (vc->vc_hi_font_mask && charcount == 256)
1917                 set_vc_hi_font(vc, false);
1918         else if (!vc->vc_hi_font_mask && charcount == 512)
1919                 set_vc_hi_font(vc, true);
1920
1921         if (resize) {
1922                 int cols, rows;
1923
1924                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1925                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1926                 cols /= w;
1927                 rows /= h;
1928                 vc_resize(vc, cols, rows);
1929         } else if (con_is_visible(vc)
1930                    && vc->vc_mode == KD_TEXT) {
1931                 fbcon_clear_margins(vc, 0);
1932                 update_screen(vc);
1933         }
1934
1935         if (old_data && (--REFCOUNT(old_data) == 0))
1936                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
1937         return 0;
1938 }
1939
1940 /*
1941  *  User asked to set font; we are guaranteed that
1942  *      a) width and height are in range 1..32
1943  *      b) charcount does not exceed 512
1944  *  but lets not assume that, since someone might someday want to use larger
1945  *  fonts. And charcount of 512 is small for unicode support.
1946  *
1947  *  However, user space gives the font in 32 rows , regardless of
1948  *  actual font height. So a new API is needed if support for larger fonts
1949  *  is ever implemented.
1950  */
1951
1952 static int fbcon_set_font(struct vc_data *vc, struct console_font *font,
1953                           unsigned int flags)
1954 {
1955         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1956         unsigned charcount = font->charcount;
1957         int w = font->width;
1958         int h = font->height;
1959         int size;
1960         int i, csum;
1961         u8 *new_data, *data = font->data;
1962         int pitch = PITCH(font->width);
1963
1964         /* Is there a reason why fbconsole couldn't handle any charcount >256?
1965          * If not this check should be changed to charcount < 256 */
1966         if (charcount != 256 && charcount != 512)
1967                 return -EINVAL;
1968
1969         /* Make sure drawing engine can handle the font */
1970         if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
1971             !(info->pixmap.blit_y & (1 << (font->height - 1))))
1972                 return -EINVAL;
1973
1974         /* Make sure driver can handle the font length */
1975         if (fbcon_invalid_charcount(info, charcount))
1976                 return -EINVAL;
1977
1978         size = CALC_FONTSZ(h, pitch, charcount);
1979
1980         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
1981
1982         if (!new_data)
1983                 return -ENOMEM;
1984
1985         memset(new_data, 0, FONT_EXTRA_WORDS * sizeof(int));
1986
1987         new_data += FONT_EXTRA_WORDS * sizeof(int);
1988         FNTSIZE(new_data) = size;
1989         REFCOUNT(new_data) = 0; /* usage counter */
1990         for (i=0; i< charcount; i++) {
1991                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
1992         }
1993
1994         /* Since linux has a nice crc32 function use it for counting font
1995          * checksums. */
1996         csum = crc32(0, new_data, size);
1997
1998         FNTSUM(new_data) = csum;
1999         /* Check if the same font is on some other console already */
2000         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2001                 struct vc_data *tmp = vc_cons[i].d;
2002
2003                 if (fb_display[i].userfont &&
2004                     fb_display[i].fontdata &&
2005                     FNTSUM(fb_display[i].fontdata) == csum &&
2006                     FNTSIZE(fb_display[i].fontdata) == size &&
2007                     tmp->vc_font.width == w &&
2008                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2009                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2010                         new_data = (u8 *)fb_display[i].fontdata;
2011                         break;
2012                 }
2013         }
2014         return fbcon_do_set_font(vc, font->width, font->height, charcount, new_data, 1);
2015 }
2016
2017 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2018 {
2019         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2020         const struct font_desc *f;
2021
2022         if (!name)
2023                 f = get_default_font(info->var.xres, info->var.yres,
2024                                      info->pixmap.blit_x, info->pixmap.blit_y);
2025         else if (!(f = find_font(name)))
2026                 return -ENOENT;
2027
2028         font->width = f->width;
2029         font->height = f->height;
2030         return fbcon_do_set_font(vc, f->width, f->height, f->charcount, f->data, 0);
2031 }
2032
2033 static u16 palette_red[16];
2034 static u16 palette_green[16];
2035 static u16 palette_blue[16];
2036
2037 static struct fb_cmap palette_cmap = {
2038         0, 16, palette_red, palette_green, palette_blue, NULL
2039 };
2040
2041 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table)
2042 {
2043         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2044         int i, j, k, depth;
2045         u8 val;
2046
2047         if (fbcon_is_inactive(vc, info))
2048                 return;
2049
2050         if (!con_is_visible(vc))
2051                 return;
2052
2053         depth = fb_get_color_depth(&info->var, &info->fix);
2054         if (depth > 3) {
2055                 for (i = j = 0; i < 16; i++) {
2056                         k = table[i];
2057                         val = vc->vc_palette[j++];
2058                         palette_red[k] = (val << 8) | val;
2059                         val = vc->vc_palette[j++];
2060                         palette_green[k] = (val << 8) | val;
2061                         val = vc->vc_palette[j++];
2062                         palette_blue[k] = (val << 8) | val;
2063                 }
2064                 palette_cmap.len = 16;
2065                 palette_cmap.start = 0;
2066         /*
2067          * If framebuffer is capable of less than 16 colors,
2068          * use default palette of fbcon.
2069          */
2070         } else
2071                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2072
2073         fb_set_cmap(&palette_cmap, info);
2074 }
2075
2076 static u16 *fbcon_screen_pos(const struct vc_data *vc, int offset)
2077 {
2078         return (u16 *) (vc->vc_origin + offset);
2079 }
2080
2081 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2082                                  int *px, int *py)
2083 {
2084         unsigned long ret;
2085         int x, y;
2086
2087         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2088                 unsigned long offset = (pos - vc->vc_origin) / 2;
2089
2090                 x = offset % vc->vc_cols;
2091                 y = offset / vc->vc_cols;
2092                 ret = pos + (vc->vc_cols - x) * 2;
2093         } else {
2094                 /* Should not happen */
2095                 x = y = 0;
2096                 ret = vc->vc_origin;
2097         }
2098         if (px)
2099                 *px = x;
2100         if (py)
2101                 *py = y;
2102         return ret;
2103 }
2104
2105 /* As we might be inside of softback, we may work with non-contiguous buffer,
2106    that's why we have to use a separate routine. */
2107 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2108 {
2109         while (cnt--) {
2110                 u16 a = scr_readw(p);
2111                 if (!vc->vc_can_do_color)
2112                         a ^= 0x0800;
2113                 else if (vc->vc_hi_font_mask == 0x100)
2114                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2115                             (((a) & 0x0e00) << 4);
2116                 else
2117                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2118                             (((a) & 0x0700) << 4);
2119                 scr_writew(a, p++);
2120         }
2121 }
2122
2123 void fbcon_suspended(struct fb_info *info)
2124 {
2125         struct vc_data *vc = NULL;
2126         struct fbcon_ops *ops = info->fbcon_par;
2127
2128         if (!ops || ops->currcon < 0)
2129                 return;
2130         vc = vc_cons[ops->currcon].d;
2131
2132         /* Clear cursor, restore saved data */
2133         fbcon_cursor(vc, CM_ERASE);
2134 }
2135
2136 void fbcon_resumed(struct fb_info *info)
2137 {
2138         struct vc_data *vc;
2139         struct fbcon_ops *ops = info->fbcon_par;
2140
2141         if (!ops || ops->currcon < 0)
2142                 return;
2143         vc = vc_cons[ops->currcon].d;
2144
2145         update_screen(vc);
2146 }
2147
2148 static void fbcon_modechanged(struct fb_info *info)
2149 {
2150         struct fbcon_ops *ops = info->fbcon_par;
2151         struct vc_data *vc;
2152         struct fbcon_display *p;
2153         int rows, cols;
2154
2155         if (!ops || ops->currcon < 0)
2156                 return;
2157         vc = vc_cons[ops->currcon].d;
2158         if (vc->vc_mode != KD_TEXT ||
2159             registered_fb[con2fb_map[ops->currcon]] != info)
2160                 return;
2161
2162         p = &fb_display[vc->vc_num];
2163         set_blitting_type(vc, info);
2164
2165         if (con_is_visible(vc)) {
2166                 var_to_display(p, &info->var, info);
2167                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2168                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2169                 cols /= vc->vc_font.width;
2170                 rows /= vc->vc_font.height;
2171                 vc_resize(vc, cols, rows);
2172                 updatescrollmode(p, info, vc);
2173                 scrollback_max = 0;
2174                 scrollback_current = 0;
2175
2176                 if (!fbcon_is_inactive(vc, info)) {
2177                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2178                     ops->update_start(info);
2179                 }
2180
2181                 fbcon_set_palette(vc, color_table);
2182                 update_screen(vc);
2183         }
2184 }
2185
2186 static void fbcon_set_all_vcs(struct fb_info *info)
2187 {
2188         struct fbcon_ops *ops = info->fbcon_par;
2189         struct vc_data *vc;
2190         struct fbcon_display *p;
2191         int i, rows, cols, fg = -1;
2192
2193         if (!ops || ops->currcon < 0)
2194                 return;
2195
2196         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2197                 vc = vc_cons[i].d;
2198                 if (!vc || vc->vc_mode != KD_TEXT ||
2199                     registered_fb[con2fb_map[i]] != info)
2200                         continue;
2201
2202                 if (con_is_visible(vc)) {
2203                         fg = i;
2204                         continue;
2205                 }
2206
2207                 p = &fb_display[vc->vc_num];
2208                 set_blitting_type(vc, info);
2209                 var_to_display(p, &info->var, info);
2210                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2211                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2212                 cols /= vc->vc_font.width;
2213                 rows /= vc->vc_font.height;
2214                 vc_resize(vc, cols, rows);
2215         }
2216
2217         if (fg != -1)
2218                 fbcon_modechanged(info);
2219 }
2220
2221
2222 void fbcon_update_vcs(struct fb_info *info, bool all)
2223 {
2224         if (all)
2225                 fbcon_set_all_vcs(info);
2226         else
2227                 fbcon_modechanged(info);
2228 }
2229 EXPORT_SYMBOL(fbcon_update_vcs);
2230
2231 int fbcon_mode_deleted(struct fb_info *info,
2232                        struct fb_videomode *mode)
2233 {
2234         struct fb_info *fb_info;
2235         struct fbcon_display *p;
2236         int i, j, found = 0;
2237
2238         /* before deletion, ensure that mode is not in use */
2239         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2240                 j = con2fb_map[i];
2241                 if (j == -1)
2242                         continue;
2243                 fb_info = registered_fb[j];
2244                 if (fb_info != info)
2245                         continue;
2246                 p = &fb_display[i];
2247                 if (!p || !p->mode)
2248                         continue;
2249                 if (fb_mode_is_equal(p->mode, mode)) {
2250                         found = 1;
2251                         break;
2252                 }
2253         }
2254         return found;
2255 }
2256
2257 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2258 static void fbcon_unbind(void)
2259 {
2260         int ret;
2261
2262         ret = do_unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
2263                                 fbcon_is_default);
2264
2265         if (!ret)
2266                 fbcon_has_console_bind = 0;
2267 }
2268 #else
2269 static inline void fbcon_unbind(void) {}
2270 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
2271
2272 /* called with console_lock held */
2273 void fbcon_fb_unbind(struct fb_info *info)
2274 {
2275         int i, new_idx = -1, ret = 0;
2276         int idx = info->node;
2277
2278         WARN_CONSOLE_UNLOCKED();
2279
2280         if (!fbcon_has_console_bind)
2281                 return;
2282
2283         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2284                 if (con2fb_map[i] != idx &&
2285                     con2fb_map[i] != -1) {
2286                         new_idx = con2fb_map[i];
2287                         break;
2288                 }
2289         }
2290
2291         if (new_idx != -1) {
2292                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2293                         if (con2fb_map[i] == idx)
2294                                 set_con2fb_map(i, new_idx, 0);
2295                 }
2296         } else {
2297                 struct fb_info *info = registered_fb[idx];
2298
2299                 /* This is sort of like set_con2fb_map, except it maps
2300                  * the consoles to no device and then releases the
2301                  * oldinfo to free memory and cancel the cursor blink
2302                  * timer. I can imagine this just becoming part of
2303                  * set_con2fb_map where new_idx is -1
2304                  */
2305                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2306                         if (con2fb_map[i] == idx) {
2307                                 con2fb_map[i] = -1;
2308                                 if (!search_fb_in_map(idx)) {
2309                                         ret = con2fb_release_oldinfo(vc_cons[i].d,
2310                                                                      info, NULL, i,
2311                                                                      idx, 0);
2312                                         if (ret) {
2313                                                 con2fb_map[i] = idx;
2314                                                 return;
2315                                         }
2316                                 }
2317                         }
2318                 }
2319                 fbcon_unbind();
2320         }
2321 }
2322
2323 /* called with console_lock held */
2324 void fbcon_fb_unregistered(struct fb_info *info)
2325 {
2326         int i, idx;
2327
2328         WARN_CONSOLE_UNLOCKED();
2329
2330         if (deferred_takeover)
2331                 return;
2332
2333         idx = info->node;
2334         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2335                 if (con2fb_map[i] == idx)
2336                         con2fb_map[i] = -1;
2337         }
2338
2339         if (idx == info_idx) {
2340                 info_idx = -1;
2341
2342                 for_each_registered_fb(i) {
2343                         info_idx = i;
2344                         break;
2345                 }
2346         }
2347
2348         if (info_idx != -1) {
2349                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2350                         if (con2fb_map[i] == -1)
2351                                 con2fb_map[i] = info_idx;
2352                 }
2353         }
2354
2355         if (primary_device == idx)
2356                 primary_device = -1;
2357
2358         if (!num_registered_fb)
2359                 do_unregister_con_driver(&fb_con);
2360 }
2361
2362 void fbcon_remap_all(struct fb_info *info)
2363 {
2364         int i, idx = info->node;
2365
2366         console_lock();
2367         if (deferred_takeover) {
2368                 for (i = first_fb_vc; i <= last_fb_vc; i++)
2369                         con2fb_map_boot[i] = idx;
2370                 fbcon_map_override();
2371                 console_unlock();
2372                 return;
2373         }
2374
2375         for (i = first_fb_vc; i <= last_fb_vc; i++)
2376                 set_con2fb_map(i, idx, 0);
2377
2378         if (con_is_bound(&fb_con)) {
2379                 printk(KERN_INFO "fbcon: Remapping primary device, "
2380                        "fb%i, to tty %i-%i\n", idx,
2381                        first_fb_vc + 1, last_fb_vc + 1);
2382                 info_idx = idx;
2383         }
2384         console_unlock();
2385 }
2386
2387 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
2388 static void fbcon_select_primary(struct fb_info *info)
2389 {
2390         if (!map_override && primary_device == -1 &&
2391             fb_is_primary_device(info)) {
2392                 int i;
2393
2394                 printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
2395                        info->fix.id, info->node);
2396                 primary_device = info->node;
2397
2398                 for (i = first_fb_vc; i <= last_fb_vc; i++)
2399                         con2fb_map_boot[i] = primary_device;
2400
2401                 if (con_is_bound(&fb_con)) {
2402                         printk(KERN_INFO "fbcon: Remapping primary device, "
2403                                "fb%i, to tty %i-%i\n", info->node,
2404                                first_fb_vc + 1, last_fb_vc + 1);
2405                         info_idx = primary_device;
2406                 }
2407         }
2408
2409 }
2410 #else
2411 static inline void fbcon_select_primary(struct fb_info *info)
2412 {
2413         return;
2414 }
2415 #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
2416
2417 /* called with console_lock held */
2418 int fbcon_fb_registered(struct fb_info *info)
2419 {
2420         int ret = 0, i, idx;
2421
2422         WARN_CONSOLE_UNLOCKED();
2423
2424         idx = info->node;
2425         fbcon_select_primary(info);
2426
2427         if (deferred_takeover) {
2428                 pr_info("fbcon: Deferring console take-over\n");
2429                 return 0;
2430         }
2431
2432         if (info_idx == -1) {
2433                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2434                         if (con2fb_map_boot[i] == idx) {
2435                                 info_idx = idx;
2436                                 break;
2437                         }
2438                 }
2439
2440                 if (info_idx != -1)
2441                         ret = do_fbcon_takeover(1);
2442         } else {
2443                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2444                         if (con2fb_map_boot[i] == idx)
2445                                 set_con2fb_map(i, idx, 0);
2446                 }
2447         }
2448
2449         return ret;
2450 }
2451
2452 void fbcon_fb_blanked(struct fb_info *info, int blank)
2453 {
2454         struct fbcon_ops *ops = info->fbcon_par;
2455         struct vc_data *vc;
2456
2457         if (!ops || ops->currcon < 0)
2458                 return;
2459
2460         vc = vc_cons[ops->currcon].d;
2461         if (vc->vc_mode != KD_TEXT ||
2462                         registered_fb[con2fb_map[ops->currcon]] != info)
2463                 return;
2464
2465         if (con_is_visible(vc)) {
2466                 if (blank)
2467                         do_blank_screen(0);
2468                 else
2469                         do_unblank_screen(0);
2470         }
2471         ops->blank_state = blank;
2472 }
2473
2474 void fbcon_new_modelist(struct fb_info *info)
2475 {
2476         int i;
2477         struct vc_data *vc;
2478         struct fb_var_screeninfo var;
2479         const struct fb_videomode *mode;
2480
2481         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2482                 if (registered_fb[con2fb_map[i]] != info)
2483                         continue;
2484                 if (!fb_display[i].mode)
2485                         continue;
2486                 vc = vc_cons[i].d;
2487                 display_to_var(&var, &fb_display[i]);
2488                 mode = fb_find_nearest_mode(fb_display[i].mode,
2489                                             &info->modelist);
2490                 fb_videomode_to_var(&var, mode);
2491                 fbcon_set_disp(info, &var, vc->vc_num);
2492         }
2493 }
2494
2495 void fbcon_get_requirement(struct fb_info *info,
2496                            struct fb_blit_caps *caps)
2497 {
2498         struct vc_data *vc;
2499
2500         if (caps->flags) {
2501                 int i, charcnt;
2502
2503                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
2504                         vc = vc_cons[i].d;
2505                         if (vc && vc->vc_mode == KD_TEXT &&
2506                             info->node == con2fb_map[i]) {
2507                                 caps->x |= 1 << (vc->vc_font.width - 1);
2508                                 caps->y |= 1 << (vc->vc_font.height - 1);
2509                                 charcnt = vc->vc_font.charcount;
2510                                 if (caps->len < charcnt)
2511                                         caps->len = charcnt;
2512                         }
2513                 }
2514         } else {
2515                 vc = vc_cons[fg_console].d;
2516
2517                 if (vc && vc->vc_mode == KD_TEXT &&
2518                     info->node == con2fb_map[fg_console]) {
2519                         caps->x = 1 << (vc->vc_font.width - 1);
2520                         caps->y = 1 << (vc->vc_font.height - 1);
2521                         caps->len = vc->vc_font.charcount;
2522                 }
2523         }
2524 }
2525
2526 int fbcon_set_con2fb_map_ioctl(void __user *argp)
2527 {
2528         struct fb_con2fbmap con2fb;
2529         int ret;
2530
2531         if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
2532                 return -EFAULT;
2533         if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
2534                 return -EINVAL;
2535         if (con2fb.framebuffer >= FB_MAX)
2536                 return -EINVAL;
2537         if (!registered_fb[con2fb.framebuffer])
2538                 request_module("fb%d", con2fb.framebuffer);
2539         if (!registered_fb[con2fb.framebuffer]) {
2540                 return -EINVAL;
2541         }
2542
2543         console_lock();
2544         ret = set_con2fb_map(con2fb.console - 1,
2545                              con2fb.framebuffer, 1);
2546         console_unlock();
2547
2548         return ret;
2549 }
2550
2551 int fbcon_get_con2fb_map_ioctl(void __user *argp)
2552 {
2553         struct fb_con2fbmap con2fb;
2554
2555         if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
2556                 return -EFAULT;
2557         if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
2558                 return -EINVAL;
2559
2560         console_lock();
2561         con2fb.framebuffer = con2fb_map[con2fb.console - 1];
2562         console_unlock();
2563
2564         return copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
2565 }
2566
2567 /*
2568  *  The console `switch' structure for the frame buffer based console
2569  */
2570
2571 static const struct consw fb_con = {
2572         .owner                  = THIS_MODULE,
2573         .con_startup            = fbcon_startup,
2574         .con_init               = fbcon_init,
2575         .con_deinit             = fbcon_deinit,
2576         .con_clear              = fbcon_clear,
2577         .con_putc               = fbcon_putc,
2578         .con_putcs              = fbcon_putcs,
2579         .con_cursor             = fbcon_cursor,
2580         .con_scroll             = fbcon_scroll,
2581         .con_switch             = fbcon_switch,
2582         .con_blank              = fbcon_blank,
2583         .con_font_set           = fbcon_set_font,
2584         .con_font_get           = fbcon_get_font,
2585         .con_font_default       = fbcon_set_def_font,
2586         .con_set_palette        = fbcon_set_palette,
2587         .con_invert_region      = fbcon_invert_region,
2588         .con_screen_pos         = fbcon_screen_pos,
2589         .con_getxy              = fbcon_getxy,
2590         .con_resize             = fbcon_resize,
2591         .con_debug_enter        = fbcon_debug_enter,
2592         .con_debug_leave        = fbcon_debug_leave,
2593 };
2594
2595 static ssize_t store_rotate(struct device *device,
2596                             struct device_attribute *attr, const char *buf,
2597                             size_t count)
2598 {
2599         struct fb_info *info;
2600         int rotate, idx;
2601         char **last = NULL;
2602
2603         console_lock();
2604         idx = con2fb_map[fg_console];
2605
2606         if (idx == -1 || registered_fb[idx] == NULL)
2607                 goto err;
2608
2609         info = registered_fb[idx];
2610         rotate = simple_strtoul(buf, last, 0);
2611         fbcon_rotate(info, rotate);
2612 err:
2613         console_unlock();
2614         return count;
2615 }
2616
2617 static ssize_t store_rotate_all(struct device *device,
2618                                 struct device_attribute *attr,const char *buf,
2619                                 size_t count)
2620 {
2621         struct fb_info *info;
2622         int rotate, idx;
2623         char **last = NULL;
2624
2625         console_lock();
2626         idx = con2fb_map[fg_console];
2627
2628         if (idx == -1 || registered_fb[idx] == NULL)
2629                 goto err;
2630
2631         info = registered_fb[idx];
2632         rotate = simple_strtoul(buf, last, 0);
2633         fbcon_rotate_all(info, rotate);
2634 err:
2635         console_unlock();
2636         return count;
2637 }
2638
2639 static ssize_t show_rotate(struct device *device,
2640                            struct device_attribute *attr,char *buf)
2641 {
2642         struct fb_info *info;
2643         int rotate = 0, idx;
2644
2645         console_lock();
2646         idx = con2fb_map[fg_console];
2647
2648         if (idx == -1 || registered_fb[idx] == NULL)
2649                 goto err;
2650
2651         info = registered_fb[idx];
2652         rotate = fbcon_get_rotate(info);
2653 err:
2654         console_unlock();
2655         return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
2656 }
2657
2658 static ssize_t show_cursor_blink(struct device *device,
2659                                  struct device_attribute *attr, char *buf)
2660 {
2661         struct fb_info *info;
2662         struct fbcon_ops *ops;
2663         int idx, blink = -1;
2664
2665         console_lock();
2666         idx = con2fb_map[fg_console];
2667
2668         if (idx == -1 || registered_fb[idx] == NULL)
2669                 goto err;
2670
2671         info = registered_fb[idx];
2672         ops = info->fbcon_par;
2673
2674         if (!ops)
2675                 goto err;
2676
2677         blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0;
2678 err:
2679         console_unlock();
2680         return snprintf(buf, PAGE_SIZE, "%d\n", blink);
2681 }
2682
2683 static ssize_t store_cursor_blink(struct device *device,
2684                                   struct device_attribute *attr,
2685                                   const char *buf, size_t count)
2686 {
2687         struct fb_info *info;
2688         int blink, idx;
2689         char **last = NULL;
2690
2691         console_lock();
2692         idx = con2fb_map[fg_console];
2693
2694         if (idx == -1 || registered_fb[idx] == NULL)
2695                 goto err;
2696
2697         info = registered_fb[idx];
2698
2699         if (!info->fbcon_par)
2700                 goto err;
2701
2702         blink = simple_strtoul(buf, last, 0);
2703
2704         if (blink) {
2705                 fbcon_cursor_noblink = 0;
2706                 fbcon_add_cursor_timer(info);
2707         } else {
2708                 fbcon_cursor_noblink = 1;
2709                 fbcon_del_cursor_timer(info);
2710         }
2711
2712 err:
2713         console_unlock();
2714         return count;
2715 }
2716
2717 static struct device_attribute device_attrs[] = {
2718         __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
2719         __ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
2720         __ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
2721                store_cursor_blink),
2722 };
2723
2724 static int fbcon_init_device(void)
2725 {
2726         int i, error = 0;
2727
2728         fbcon_has_sysfs = 1;
2729
2730         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
2731                 error = device_create_file(fbcon_device, &device_attrs[i]);
2732
2733                 if (error)
2734                         break;
2735         }
2736
2737         if (error) {
2738                 while (--i >= 0)
2739                         device_remove_file(fbcon_device, &device_attrs[i]);
2740
2741                 fbcon_has_sysfs = 0;
2742         }
2743
2744         return 0;
2745 }
2746
2747 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
2748 static void fbcon_register_existing_fbs(struct work_struct *work)
2749 {
2750         int i;
2751
2752         console_lock();
2753
2754         for_each_registered_fb(i)
2755                 fbcon_fb_registered(registered_fb[i]);
2756
2757         console_unlock();
2758 }
2759
2760 static struct notifier_block fbcon_output_nb;
2761 static DECLARE_WORK(fbcon_deferred_takeover_work, fbcon_register_existing_fbs);
2762
2763 static int fbcon_output_notifier(struct notifier_block *nb,
2764                                  unsigned long action, void *data)
2765 {
2766         WARN_CONSOLE_UNLOCKED();
2767
2768         pr_info("fbcon: Taking over console\n");
2769
2770         dummycon_unregister_output_notifier(&fbcon_output_nb);
2771         deferred_takeover = false;
2772         logo_shown = FBCON_LOGO_DONTSHOW;
2773
2774         /* We may get called in atomic context */
2775         schedule_work(&fbcon_deferred_takeover_work);
2776
2777         return NOTIFY_OK;
2778 }
2779 #endif
2780
2781 static void fbcon_start(void)
2782 {
2783         WARN_CONSOLE_UNLOCKED();
2784
2785 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
2786         if (conswitchp != &dummy_con)
2787                 deferred_takeover = false;
2788
2789         if (deferred_takeover) {
2790                 fbcon_output_nb.notifier_call = fbcon_output_notifier;
2791                 dummycon_register_output_notifier(&fbcon_output_nb);
2792                 return;
2793         }
2794 #endif
2795
2796         if (num_registered_fb) {
2797                 int i;
2798
2799                 for_each_registered_fb(i) {
2800                         info_idx = i;
2801                         break;
2802                 }
2803
2804                 do_fbcon_takeover(0);
2805         }
2806 }
2807
2808 static void fbcon_exit(void)
2809 {
2810         struct fb_info *info;
2811         int i, j, mapped;
2812
2813 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
2814         if (deferred_takeover) {
2815                 dummycon_unregister_output_notifier(&fbcon_output_nb);
2816                 deferred_takeover = false;
2817         }
2818 #endif
2819
2820         for_each_registered_fb(i) {
2821                 int pending = 0;
2822
2823                 mapped = 0;
2824                 info = registered_fb[i];
2825
2826                 if (info->queue.func)
2827                         pending = cancel_work_sync(&info->queue);
2828                 pr_debug("fbcon: %s pending work\n", (pending ? "canceled" : "no"));
2829
2830                 for (j = first_fb_vc; j <= last_fb_vc; j++) {
2831                         if (con2fb_map[j] == i) {
2832                                 mapped = 1;
2833                                 con2fb_map[j] = -1;
2834                         }
2835                 }
2836
2837                 if (mapped) {
2838                         if (info->fbops->fb_release)
2839                                 info->fbops->fb_release(info, 0);
2840                         module_put(info->fbops->owner);
2841
2842                         if (info->fbcon_par) {
2843                                 struct fbcon_ops *ops = info->fbcon_par;
2844
2845                                 fbcon_del_cursor_timer(info);
2846                                 kfree(ops->cursor_src);
2847                                 kfree(ops->cursor_state.mask);
2848                                 kfree(info->fbcon_par);
2849                                 info->fbcon_par = NULL;
2850                         }
2851
2852                         if (info->queue.func == fb_flashcursor)
2853                                 info->queue.func = NULL;
2854                 }
2855         }
2856 }
2857
2858 void __init fb_console_init(void)
2859 {
2860         int i;
2861
2862         console_lock();
2863         fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
2864                                      "fbcon");
2865
2866         if (IS_ERR(fbcon_device)) {
2867                 printk(KERN_WARNING "Unable to create device "
2868                        "for fbcon; errno = %ld\n",
2869                        PTR_ERR(fbcon_device));
2870                 fbcon_device = NULL;
2871         } else
2872                 fbcon_init_device();
2873
2874         for (i = 0; i < MAX_NR_CONSOLES; i++)
2875                 con2fb_map[i] = -1;
2876
2877         fbcon_start();
2878         console_unlock();
2879 }
2880
2881 #ifdef MODULE
2882
2883 static void __exit fbcon_deinit_device(void)
2884 {
2885         int i;
2886
2887         if (fbcon_has_sysfs) {
2888                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
2889                         device_remove_file(fbcon_device, &device_attrs[i]);
2890
2891                 fbcon_has_sysfs = 0;
2892         }
2893 }
2894
2895 void __exit fb_console_exit(void)
2896 {
2897         console_lock();
2898         fbcon_deinit_device();
2899         device_destroy(fb_class, MKDEV(0, 0));
2900         fbcon_exit();
2901         do_unregister_con_driver(&fb_con);
2902         console_unlock();
2903 }
2904 #endif