drivers/video/console/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 #undef FBCONDEBUG
  60
  61 #include <linux/module.h>
  62 #include <linux/types.h>
  63 #include <linux/fs.h>
  64 #include <linux/kernel.h>
  65 #include <linux/delay.h>        /* MSch: for IRQ probe */
  66 #include <linux/console.h>
  67 #include <linux/string.h>
  68 #include <linux/kd.h>
  69 #include <linux/slab.h>
  70 #include <linux/fb.h>
  71 #include <linux/vt_kern.h>
  72 #include <linux/selection.h>
  73 #include <linux/font.h>
  74 #include <linux/smp.h>
  75 #include <linux/init.h>
  76 #include <linux/interrupt.h>
  77 #include <linux/crc32.h> /* For counting font checksums */
  78 #include <asm/fb.h>
  79 #include <asm/irq.h>
  80
  81 #include "fbcon.h"
  82
  83 #ifdef FBCONDEBUG
  84 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __func__ , ## args)
  85 #else
  86 #  define DPRINTK(fmt, args...)
  87 #endif
  88
  89 enum {
  90         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
  91         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
  92         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
  93 };
  94
  95 static struct display fb_display[MAX_NR_CONSOLES];
  96
  97 static signed char con2fb_map[MAX_NR_CONSOLES];
  98 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
  99
 100 static int logo_lines;
 101 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 102    enums.  */
 103 static int logo_shown = FBCON_LOGO_CANSHOW;
 104 /* Software scrollback */
 105 static int fbcon_softback_size = 32768;
 106 static unsigned long softback_buf, softback_curr;
 107 static unsigned long softback_in;
 108 static unsigned long softback_top, softback_end;
 109 static int softback_lines;
 110 /* console mappings */
 111 static int first_fb_vc;
 112 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 113 static int fbcon_is_default = 1;
 114 static int fbcon_has_exited;
 115 static int primary_device = -1;
 116 static int fbcon_has_console_bind;
 117
 118 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
 119 static int map_override;
 120
 121 static inline void fbcon_map_override(void)
 122 {
 123         map_override = 1;
 124 }
 125 #else
 126 static inline void fbcon_map_override(void)
 127 {
 128 }
 129 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */
 130
 131 /* font data */
 132 static char fontname[40];
 133
 134 /* current fb_info */
 135 static int info_idx = -1;
 136
 137 /* console rotation */
 138 static int initial_rotation;
 139 static int fbcon_has_sysfs;
 140
 141 static const struct consw fb_con;
 142
 143 #define CM_SOFTBACK     (8)
 144
 145 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 146
 147 static int fbcon_set_origin(struct vc_data *);
 148
 149 #define CURSOR_DRAW_DELAY               (1)
 150
 151 static int vbl_cursor_cnt;
 152 static int fbcon_cursor_noblink;
 153
 154 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 155
 156 /*
 157  *  Interface used by the world
 158  */
 159
 160 static const char *fbcon_startup(void);
 161 static void fbcon_init(struct vc_data *vc, int init);
 162 static void fbcon_deinit(struct vc_data *vc);
 163 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 164                         int width);
 165 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
 166 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 167                         int count, int ypos, int xpos);
 168 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 169 static void fbcon_cursor(struct vc_data *vc, int mode);
 170 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 171                         int count);
 172 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
 173                         int height, int width);
 174 static int fbcon_switch(struct vc_data *vc);
 175 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
 176 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
 177 static int fbcon_scrolldelta(struct vc_data *vc, int lines);
 178
 179 /*
 180  *  Internal routines
 181  */
 182 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 183 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 184 static __inline__ void ypan_up(struct vc_data *vc, int count);
 185 static __inline__ void ypan_down(struct vc_data *vc, int count);
 186 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
 187                             int dy, int dx, int height, int width, u_int y_break);
 188 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 189                            int unit);
 190 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 191                               int line, int count, int dy);
 192 static void fbcon_modechanged(struct fb_info *info);
 193 static void fbcon_set_all_vcs(struct fb_info *info);
 194 static void fbcon_start(void);
 195 static void fbcon_exit(void);
 196 static struct device *fbcon_device;
 197
 198 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 199 static inline void fbcon_set_rotation(struct fb_info *info)
 200 {
 201         struct fbcon_ops *ops = info->fbcon_par;
 202
 203         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
 204             ops->p->con_rotate < 4)
 205                 ops->rotate = ops->p->con_rotate;
 206         else
 207                 ops->rotate = 0;
 208 }
 209
 210 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 211 {
 212         struct fbcon_ops *ops= info->fbcon_par;
 213         struct fb_info *fb_info;
 214
 215         if (!ops || ops->currcon == -1)
 216                 return;
 217
 218         fb_info = registered_fb[con2fb_map[ops->currcon]];
 219
 220         if (info == fb_info) {
 221                 struct display *p = &fb_display[ops->currcon];
 222
 223                 if (rotate < 4)
 224                         p->con_rotate = rotate;
 225                 else
 226                         p->con_rotate = 0;
 227
 228                 fbcon_modechanged(info);
 229         }
 230 }
 231
 232 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 233 {
 234         struct fbcon_ops *ops = info->fbcon_par;
 235         struct vc_data *vc;
 236         struct display *p;
 237         int i;
 238
 239         if (!ops || ops->currcon < 0 || rotate > 3)
 240                 return;
 241
 242         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 243                 vc = vc_cons[i].d;
 244                 if (!vc || vc->vc_mode != KD_TEXT ||
 245                     registered_fb[con2fb_map[i]] != info)
 246                         continue;
 247
 248                 p = &fb_display[vc->vc_num];
 249                 p->con_rotate = rotate;
 250         }
 251
 252         fbcon_set_all_vcs(info);
 253 }
 254 #else
 255 static inline void fbcon_set_rotation(struct fb_info *info)
 256 {
 257         struct fbcon_ops *ops = info->fbcon_par;
 258
 259         ops->rotate = FB_ROTATE_UR;
 260 }
 261
 262 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 263 {
 264         return;
 265 }
 266
 267 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 268 {
 269         return;
 270 }
 271 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 272
 273 static int fbcon_get_rotate(struct fb_info *info)
 274 {
 275         struct fbcon_ops *ops = info->fbcon_par;
 276
 277         return (ops) ? ops->rotate : 0;
 278 }
 279
 280 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 281 {
 282         struct fbcon_ops *ops = info->fbcon_par;
 283
 284         return (info->state != FBINFO_STATE_RUNNING ||
 285                 vc->vc_mode != KD_TEXT || ops->graphics) &&
 286                 !vt_force_oops_output(vc);
 287 }
 288
 289 static int get_color(struct vc_data *vc, struct fb_info *info,
 290               u16 c, int is_fg)
 291 {
 292         int depth = fb_get_color_depth(&info->var, &info->fix);
 293         int color = 0;
 294
 295         if (console_blanked) {
 296                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 297
 298                 c = vc->vc_video_erase_char & charmask;
 299         }
 300
 301         if (depth != 1)
 302                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 303                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 304
 305         switch (depth) {
 306         case 1:
 307         {
 308                 int col = mono_col(info);
 309                 /* 0 or 1 */
 310                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 311                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 312
 313                 if (console_blanked)
 314                         fg = bg;
 315
 316                 color = (is_fg) ? fg : bg;
 317                 break;
 318         }
 319         case 2:
 320                 /*
 321                  * Scale down 16-colors to 4 colors. Default 4-color palette
 322                  * is grayscale. However, simply dividing the values by 4
 323                  * will not work, as colors 1, 2 and 3 will be scaled-down
 324                  * to zero rendering them invisible.  So empirically convert
 325                  * colors to a sane 4-level grayscale.
 326                  */
 327                 switch (color) {
 328                 case 0:
 329                         color = 0; /* black */
 330                         break;
 331                 case 1 ... 6:
 332                         color = 2; /* white */
 333                         break;
 334                 case 7 ... 8:
 335                         color = 1; /* gray */
 336                         break;
 337                 default:
 338                         color = 3; /* intense white */
 339                         break;
 340                 }
 341                 break;
 342         case 3:
 343                 /*
 344                  * Last 8 entries of default 16-color palette is a more intense
 345                  * version of the first 8 (i.e., same chrominance, different
 346                  * luminance).
 347                  */
 348                 color &= 7;
 349                 break;
 350         }
 351
 352
 353         return color;
 354 }
 355
 356 static void fbcon_update_softback(struct vc_data *vc)
 357 {
 358         int l = fbcon_softback_size / vc->vc_size_row;
 359
 360         if (l > 5)
 361                 softback_end = softback_buf + l * vc->vc_size_row;
 362         else
 363                 /* Smaller scrollback makes no sense, and 0 would screw
 364                    the operation totally */
 365                 softback_top = 0;
 366 }
 367
 368 static void fb_flashcursor(struct work_struct *work)
 369 {
 370         struct fb_info *info = container_of(work, struct fb_info, queue);
 371         struct fbcon_ops *ops = info->fbcon_par;
 372         struct vc_data *vc = NULL;
 373         int c;
 374         int mode;
 375         int ret;
 376
 377         /* FIXME: we should sort out the unbind locking instead */
 378         /* instead we just fail to flash the cursor if we can't get
 379          * the lock instead of blocking fbcon deinit */
 380         ret = console_trylock();
 381         if (ret == 0)
 382                 return;
 383
 384         if (ops && ops->currcon != -1)
 385                 vc = vc_cons[ops->currcon].d;
 386
 387         if (!vc || !CON_IS_VISIBLE(vc) ||
 388             registered_fb[con2fb_map[vc->vc_num]] != info ||
 389             vc->vc_deccm != 1) {
 390                 console_unlock();
 391                 return;
 392         }
 393
 394         c = scr_readw((u16 *) vc->vc_pos);
 395         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 396                 CM_ERASE : CM_DRAW;
 397         ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
 398                     get_color(vc, info, c, 0));
 399         console_unlock();
 400 }
 401
 402 static void cursor_timer_handler(unsigned long dev_addr)
 403 {
 404         struct fb_info *info = (struct fb_info *) dev_addr;
 405         struct fbcon_ops *ops = info->fbcon_par;
 406
 407         schedule_work(&info->queue);
 408         mod_timer(&ops->cursor_timer, jiffies + HZ/5);
 409 }
 410
 411 static void fbcon_add_cursor_timer(struct fb_info *info)
 412 {
 413         struct fbcon_ops *ops = info->fbcon_par;
 414
 415         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
 416             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER) &&
 417             !fbcon_cursor_noblink) {
 418                 if (!info->queue.func)
 419                         INIT_WORK(&info->queue, fb_flashcursor);
 420
 421                 init_timer(&ops->cursor_timer);
 422                 ops->cursor_timer.function = cursor_timer_handler;
 423                 ops->cursor_timer.expires = jiffies + HZ / 5;
 424                 ops->cursor_timer.data = (unsigned long ) info;
 425                 add_timer(&ops->cursor_timer);
 426                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
 427         }
 428 }
 429
 430 static void fbcon_del_cursor_timer(struct fb_info *info)
 431 {
 432         struct fbcon_ops *ops = info->fbcon_par;
 433
 434         if (info->queue.func == fb_flashcursor &&
 435             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
 436                 del_timer_sync(&ops->cursor_timer);
 437                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
 438         }
 439 }
 440
 441 #ifndef MODULE
 442 static int __init fb_console_setup(char *this_opt)
 443 {
 444         char *options;
 445         int i, j;
 446
 447         if (!this_opt || !*this_opt)
 448                 return 1;
 449
 450         while ((options = strsep(&this_opt, ",")) != NULL) {
 451                 if (!strncmp(options, "font:", 5))
 452                         strlcpy(fontname, options + 5, sizeof(fontname));
 453
 454                 if (!strncmp(options, "scrollback:", 11)) {
 455                         options += 11;
 456                         if (*options) {
 457                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
 458                                 if (*options == 'k' || *options == 'K') {
 459                                         fbcon_softback_size *= 1024;
 460                                         options++;
 461                                 }
 462                                 if (*options != ',')
 463                                         return 1;
 464                                 options++;
 465                         } else
 466                                 return 1;
 467                 }
 468
 469                 if (!strncmp(options, "map:", 4)) {
 470                         options += 4;
 471                         if (*options) {
 472                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 473                                         if (!options[j])
 474                                                 j = 0;
 475                                         con2fb_map_boot[i] =
 476                                                 (options[j++]-'0') % FB_MAX;
 477                                 }
 478
 479                                 fbcon_map_override();
 480                         }
 481
 482                         return 1;
 483                 }
 484
 485                 if (!strncmp(options, "vc:", 3)) {
 486                         options += 3;
 487                         if (*options)
 488                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 489                         if (first_fb_vc < 0)
 490                                 first_fb_vc = 0;
 491                         if (*options++ == '-')
 492                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 493                         fbcon_is_default = 0;
 494                 }
 495
 496                 if (!strncmp(options, "rotate:", 7)) {
 497                         options += 7;
 498                         if (*options)
 499                                 initial_rotation = simple_strtoul(options, &options, 0);
 500                         if (initial_rotation > 3)
 501                                 initial_rotation = 0;
 502                 }
 503         }
 504         return 1;
 505 }
 506
 507 __setup("fbcon=", fb_console_setup);
 508 #endif
 509
 510 static int search_fb_in_map(int idx)
 511 {
 512         int i, retval = 0;
 513
 514         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 515                 if (con2fb_map[i] == idx)
 516                         retval = 1;
 517         }
 518         return retval;
 519 }
 520
 521 static int search_for_mapped_con(void)
 522 {
 523         int i, retval = 0;
 524
 525         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 526                 if (con2fb_map[i] != -1)
 527                         retval = 1;
 528         }
 529         return retval;
 530 }
 531
 532 static int fbcon_takeover(int show_logo)
 533 {
 534         int err, i;
 535
 536         if (!num_registered_fb)
 537                 return -ENODEV;
 538
 539         if (!show_logo)
 540                 logo_shown = FBCON_LOGO_DONTSHOW;
 541
 542         for (i = first_fb_vc; i <= last_fb_vc; i++)
 543                 con2fb_map[i] = info_idx;
 544
 545         err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 546                                 fbcon_is_default);
 547
 548         if (err) {
 549                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
 550                         con2fb_map[i] = -1;
 551                 }
 552                 info_idx = -1;
 553         } else {
 554                 fbcon_has_console_bind = 1;
 555         }
 556
 557         return err;
 558 }
 559
 560 #ifdef MODULE
 561 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 562                                int cols, int rows, int new_cols, int new_rows)
 563 {
 564         logo_shown = FBCON_LOGO_DONTSHOW;
 565 }
 566 #else
 567 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 568                                int cols, int rows, int new_cols, int new_rows)
 569 {
 570         /* Need to make room for the logo */
 571         struct fbcon_ops *ops = info->fbcon_par;
 572         int cnt, erase = vc->vc_video_erase_char, step;
 573         unsigned short *save = NULL, *r, *q;
 574         int logo_height;
 575
 576         if (info->flags & FBINFO_MODULE) {
 577                 logo_shown = FBCON_LOGO_DONTSHOW;
 578                 return;
 579         }
 580
 581         /*
 582          * remove underline attribute from erase character
 583          * if black and white framebuffer.
 584          */
 585         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 586                 erase &= ~0x400;
 587         logo_height = fb_prepare_logo(info, ops->rotate);
 588         logo_lines = DIV_ROUND_UP(logo_height, vc->vc_font.height);
 589         q = (unsigned short *) (vc->vc_origin +
 590                                 vc->vc_size_row * rows);
 591         step = logo_lines * cols;
 592         for (r = q - logo_lines * cols; r < q; r++)
 593                 if (scr_readw(r) != vc->vc_video_erase_char)
 594                         break;
 595         if (r != q && new_rows >= rows + logo_lines) {
 596                 save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
 597                 if (save) {
 598                         int i = cols < new_cols ? cols : new_cols;
 599                         scr_memsetw(save, erase, logo_lines * new_cols * 2);
 600                         r = q - step;
 601                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 602                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 603                         r = q;
 604                 }
 605         }
 606         if (r == q) {
 607                 /* We can scroll screen down */
 608                 r = q - step - cols;
 609                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 610                         scr_memcpyw(r + step, r, vc->vc_size_row);
 611                         r -= cols;
 612                 }
 613                 if (!save) {
 614                         int lines;
 615                         if (vc->vc_y + logo_lines >= rows)
 616                                 lines = rows - vc->vc_y - 1;
 617                         else
 618                                 lines = logo_lines;
 619                         vc->vc_y += lines;
 620                         vc->vc_pos += lines * vc->vc_size_row;
 621                 }
 622         }
 623         scr_memsetw((unsigned short *) vc->vc_origin,
 624                     erase,
 625                     vc->vc_size_row * logo_lines);
 626
 627         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
 628                 fbcon_clear_margins(vc, 0);
 629                 update_screen(vc);
 630         }
 631
 632         if (save) {
 633                 q = (unsigned short *) (vc->vc_origin +
 634                                         vc->vc_size_row *
 635                                         rows);
 636                 scr_memcpyw(q, save, logo_lines * new_cols * 2);
 637                 vc->vc_y += logo_lines;
 638                 vc->vc_pos += logo_lines * vc->vc_size_row;
 639                 kfree(save);
 640         }
 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 if (logo_shown != FBCON_LOGO_DONTSHOW) {
 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                 info->fbcon_par = ops;
 718
 719                 if (vc)
 720                         set_blitting_type(vc, info);
 721         }
 722
 723         if (err) {
 724                 con2fb_map[unit] = oldidx;
 725                 module_put(info->fbops->owner);
 726         }
 727
 728         return err;
 729 }
 730
 731 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 732                                   struct fb_info *newinfo, int unit,
 733                                   int oldidx, int found)
 734 {
 735         struct fbcon_ops *ops = oldinfo->fbcon_par;
 736         int err = 0, ret;
 737
 738         if (oldinfo->fbops->fb_release &&
 739             oldinfo->fbops->fb_release(oldinfo, 0)) {
 740                 con2fb_map[unit] = oldidx;
 741                 if (!found && newinfo->fbops->fb_release)
 742                         newinfo->fbops->fb_release(newinfo, 0);
 743                 if (!found)
 744                         module_put(newinfo->fbops->owner);
 745                 err = -ENODEV;
 746         }
 747
 748         if (!err) {
 749                 fbcon_del_cursor_timer(oldinfo);
 750                 kfree(ops->cursor_state.mask);
 751                 kfree(ops->cursor_data);
 752                 kfree(ops->fontbuffer);
 753                 kfree(oldinfo->fbcon_par);
 754                 oldinfo->fbcon_par = NULL;
 755                 module_put(oldinfo->fbops->owner);
 756                 /*
 757                   If oldinfo and newinfo are driving the same hardware,
 758                   the fb_release() method of oldinfo may attempt to
 759                   restore the hardware state.  This will leave the
 760                   newinfo in an undefined state. Thus, a call to
 761                   fb_set_par() may be needed for the newinfo.
 762                 */
 763                 if (newinfo->fbops->fb_set_par) {
 764                         ret = newinfo->fbops->fb_set_par(newinfo);
 765
 766                         if (ret)
 767                                 printk(KERN_ERR "con2fb_release_oldinfo: "
 768                                         "detected unhandled fb_set_par error, "
 769                                         "error code %d\n", ret);
 770                 }
 771         }
 772
 773         return err;
 774 }
 775
 776 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 777                                 int unit, int show_logo)
 778 {
 779         struct fbcon_ops *ops = info->fbcon_par;
 780         int ret;
 781
 782         ops->currcon = fg_console;
 783
 784         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT)) {
 785                 ret = info->fbops->fb_set_par(info);
 786
 787                 if (ret)
 788                         printk(KERN_ERR "con2fb_init_display: detected "
 789                                 "unhandled fb_set_par error, "
 790                                 "error code %d\n", ret);
 791         }
 792
 793         ops->flags |= FBCON_FLAGS_INIT;
 794         ops->graphics = 0;
 795         fbcon_set_disp(info, &info->var, unit);
 796
 797         if (show_logo) {
 798                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 799                 struct fb_info *fg_info =
 800                         registered_fb[con2fb_map[fg_console]];
 801
 802                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 803                                    fg_vc->vc_rows, fg_vc->vc_cols,
 804                                    fg_vc->vc_rows);
 805         }
 806
 807         update_screen(vc_cons[fg_console].d);
 808 }
 809
 810 /**
 811  *      set_con2fb_map - map console to frame buffer device
 812  *      @unit: virtual console number to map
 813  *      @newidx: frame buffer index to map virtual console to
 814  *      @user: user request
 815  *
 816  *      Maps a virtual console @unit to a frame buffer device
 817  *      @newidx.
 818  */
 819 static int set_con2fb_map(int unit, int newidx, int user)
 820 {
 821         struct vc_data *vc = vc_cons[unit].d;
 822         int oldidx = con2fb_map[unit];
 823         struct fb_info *info = registered_fb[newidx];
 824         struct fb_info *oldinfo = NULL;
 825         int found, err = 0;
 826
 827         if (oldidx == newidx)
 828                 return 0;
 829
 830         if (!info)
 831                 return -EINVAL;
 832
 833         if (!search_for_mapped_con() || !con_is_bound(&fb_con)) {
 834                 info_idx = newidx;
 835                 return fbcon_takeover(0);
 836         }
 837
 838         if (oldidx != -1)
 839                 oldinfo = registered_fb[oldidx];
 840
 841         found = search_fb_in_map(newidx);
 842
 843         console_lock();
 844         con2fb_map[unit] = newidx;
 845         if (!err && !found)
 846                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 847
 848
 849         /*
 850          * If old fb is not mapped to any of the consoles,
 851          * fbcon should release it.
 852          */
 853         if (!err && oldinfo && !search_fb_in_map(oldidx))
 854                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 855                                              found);
 856
 857         if (!err) {
 858                 int show_logo = (fg_console == 0 && !user &&
 859                                  logo_shown != FBCON_LOGO_DONTSHOW);
 860
 861                 if (!found)
 862                         fbcon_add_cursor_timer(info);
 863                 con2fb_map_boot[unit] = newidx;
 864                 con2fb_init_display(vc, info, unit, show_logo);
 865         }
 866
 867         if (!search_fb_in_map(info_idx))
 868                 info_idx = newidx;
 869
 870         console_unlock();
 871         return err;
 872 }
 873
 874 /*
 875  *  Low Level Operations
 876  */
 877 /* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
 878 static int var_to_display(struct display *disp,
 879                           struct fb_var_screeninfo *var,
 880                           struct fb_info *info)
 881 {
 882         disp->xres_virtual = var->xres_virtual;
 883         disp->yres_virtual = var->yres_virtual;
 884         disp->bits_per_pixel = var->bits_per_pixel;
 885         disp->grayscale = var->grayscale;
 886         disp->nonstd = var->nonstd;
 887         disp->accel_flags = var->accel_flags;
 888         disp->height = var->height;
 889         disp->width = var->width;
 890         disp->red = var->red;
 891         disp->green = var->green;
 892         disp->blue = var->blue;
 893         disp->transp = var->transp;
 894         disp->rotate = var->rotate;
 895         disp->mode = fb_match_mode(var, &info->modelist);
 896         if (disp->mode == NULL)
 897                 /* This should not happen */
 898                 return -EINVAL;
 899         return 0;
 900 }
 901
 902 static void display_to_var(struct fb_var_screeninfo *var,
 903                            struct display *disp)
 904 {
 905         fb_videomode_to_var(var, disp->mode);
 906         var->xres_virtual = disp->xres_virtual;
 907         var->yres_virtual = disp->yres_virtual;
 908         var->bits_per_pixel = disp->bits_per_pixel;
 909         var->grayscale = disp->grayscale;
 910         var->nonstd = disp->nonstd;
 911         var->accel_flags = disp->accel_flags;
 912         var->height = disp->height;
 913         var->width = disp->width;
 914         var->red = disp->red;
 915         var->green = disp->green;
 916         var->blue = disp->blue;
 917         var->transp = disp->transp;
 918         var->rotate = disp->rotate;
 919 }
 920
 921 static const char *fbcon_startup(void)
 922 {
 923         const char *display_desc = "frame buffer device";
 924         struct display *p = &fb_display[fg_console];
 925         struct vc_data *vc = vc_cons[fg_console].d;
 926         const struct font_desc *font = NULL;
 927         struct module *owner;
 928         struct fb_info *info = NULL;
 929         struct fbcon_ops *ops;
 930         int rows, cols;
 931
 932         /*
 933          *  If num_registered_fb is zero, this is a call for the dummy part.
 934          *  The frame buffer devices weren't initialized yet.
 935          */
 936         if (!num_registered_fb || info_idx == -1)
 937                 return display_desc;
 938         /*
 939          * Instead of blindly using registered_fb[0], we use info_idx, set by
 940          * fb_console_init();
 941          */
 942         info = registered_fb[info_idx];
 943         if (!info)
 944                 return NULL;
 945
 946         owner = info->fbops->owner;
 947         if (!try_module_get(owner))
 948                 return NULL;
 949         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 950                 module_put(owner);
 951                 return NULL;
 952         }
 953
 954         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 955         if (!ops) {
 956                 module_put(owner);
 957                 return NULL;
 958         }
 959
 960         ops->currcon = -1;
 961         ops->graphics = 1;
 962         ops->cur_rotate = -1;
 963         info->fbcon_par = ops;
 964         p->con_rotate = initial_rotation;
 965         set_blitting_type(vc, info);
 966
 967         if (info->fix.type != FB_TYPE_TEXT) {
 968                 if (fbcon_softback_size) {
 969                         if (!softback_buf) {
 970                                 softback_buf =
 971                                     (unsigned long)
 972                                     kmalloc(fbcon_softback_size,
 973                                             GFP_KERNEL);
 974                                 if (!softback_buf) {
 975                                         fbcon_softback_size = 0;
 976                                         softback_top = 0;
 977                                 }
 978                         }
 979                 } else {
 980                         if (softback_buf) {
 981                                 kfree((void *) softback_buf);
 982                                 softback_buf = 0;
 983                                 softback_top = 0;
 984                         }
 985                 }
 986                 if (softback_buf)
 987                         softback_in = softback_top = softback_curr =
 988                             softback_buf;
 989                 softback_lines = 0;
 990         }
 991
 992         /* Setup default font */
 993         if (!p->fontdata) {
 994                 if (!fontname[0] || !(font = find_font(fontname)))
 995                         font = get_default_font(info->var.xres,
 996                                                 info->var.yres,
 997                                                 info->pixmap.blit_x,
 998                                                 info->pixmap.blit_y);
 999                 vc->vc_font.width = font->width;
1000                 vc->vc_font.height = font->height;
1001                 vc->vc_font.data = (void *)(p->fontdata = font->data);
1002                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
1003         }
1004
1005         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1006         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1007         cols /= vc->vc_font.width;
1008         rows /= vc->vc_font.height;
1009         vc_resize(vc, cols, rows);
1010
1011         DPRINTK("mode:   %s\n", info->fix.id);
1012         DPRINTK("visual: %d\n", info->fix.visual);
1013         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
1014                 info->var.yres,
1015                 info->var.bits_per_pixel);
1016
1017         fbcon_add_cursor_timer(info);
1018         fbcon_has_exited = 0;
1019         return display_desc;
1020 }
1021
1022 static void fbcon_init(struct vc_data *vc, int init)
1023 {
1024         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1025         struct fbcon_ops *ops;
1026         struct vc_data **default_mode = vc->vc_display_fg;
1027         struct vc_data *svc = *default_mode;
1028         struct display *t, *p = &fb_display[vc->vc_num];
1029         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1030         int cap, ret;
1031
1032         if (info_idx == -1 || info == NULL)
1033             return;
1034
1035         cap = info->flags;
1036
1037         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1038             (info->fix.type == FB_TYPE_TEXT))
1039                 logo = 0;
1040
1041         if (var_to_display(p, &info->var, info))
1042                 return;
1043
1044         if (!info->fbcon_par)
1045                 con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);
1046
1047         /* If we are not the first console on this
1048            fb, copy the font from that console */
1049         t = &fb_display[fg_console];
1050         if (!p->fontdata) {
1051                 if (t->fontdata) {
1052                         struct vc_data *fvc = vc_cons[fg_console].d;
1053
1054                         vc->vc_font.data = (void *)(p->fontdata =
1055                                                     fvc->vc_font.data);
1056                         vc->vc_font.width = fvc->vc_font.width;
1057                         vc->vc_font.height = fvc->vc_font.height;
1058                         p->userfont = t->userfont;
1059
1060                         if (p->userfont)
1061                                 REFCOUNT(p->fontdata)++;
1062                 } else {
1063                         const struct font_desc *font = NULL;
1064
1065                         if (!fontname[0] || !(font = find_font(fontname)))
1066                                 font = get_default_font(info->var.xres,
1067                                                         info->var.yres,
1068                                                         info->pixmap.blit_x,
1069                                                         info->pixmap.blit_y);
1070                         vc->vc_font.width = font->width;
1071                         vc->vc_font.height = font->height;
1072                         vc->vc_font.data = (void *)(p->fontdata = font->data);
1073                         vc->vc_font.charcount = 256; /* FIXME  Need to
1074                                                         support more fonts */
1075                 }
1076         }
1077
1078         if (p->userfont)
1079                 charcnt = FNTCHARCNT(p->fontdata);
1080
1081         vc->vc_panic_force_write = !!(info->flags & FBINFO_CAN_FORCE_OUTPUT);
1082         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1083         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1084         if (charcnt == 256) {
1085                 vc->vc_hi_font_mask = 0;
1086         } else {
1087                 vc->vc_hi_font_mask = 0x100;
1088                 if (vc->vc_can_do_color)
1089                         vc->vc_complement_mask <<= 1;
1090         }
1091
1092         if (!*svc->vc_uni_pagedir_loc)
1093                 con_set_default_unimap(svc);
1094         if (!*vc->vc_uni_pagedir_loc)
1095                 con_copy_unimap(vc, svc);
1096
1097         ops = info->fbcon_par;
1098         p->con_rotate = initial_rotation;
1099         set_blitting_type(vc, info);
1100
1101         cols = vc->vc_cols;
1102         rows = vc->vc_rows;
1103         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1104         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1105         new_cols /= vc->vc_font.width;
1106         new_rows /= vc->vc_font.height;
1107
1108         /*
1109          * We must always set the mode. The mode of the previous console
1110          * driver could be in the same resolution but we are using different
1111          * hardware so we have to initialize the hardware.
1112          *
1113          * We need to do it in fbcon_init() to prevent screen corruption.
1114          */
1115         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
1116                 if (info->fbops->fb_set_par &&
1117                     !(ops->flags & FBCON_FLAGS_INIT)) {
1118                         ret = info->fbops->fb_set_par(info);
1119
1120                         if (ret)
1121                                 printk(KERN_ERR "fbcon_init: detected "
1122                                         "unhandled fb_set_par error, "
1123                                         "error code %d\n", ret);
1124                 }
1125
1126                 ops->flags |= FBCON_FLAGS_INIT;
1127         }
1128
1129         ops->graphics = 0;
1130
1131         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1132             !(cap & FBINFO_HWACCEL_DISABLED))
1133                 p->scrollmode = SCROLL_MOVE;
1134         else /* default to something safe */
1135                 p->scrollmode = SCROLL_REDRAW;
1136
1137         /*
1138          *  ++guenther: console.c:vc_allocate() relies on initializing
1139          *  vc_{cols,rows}, but we must not set those if we are only
1140          *  resizing the console.
1141          */
1142         if (init) {
1143                 vc->vc_cols = new_cols;
1144                 vc->vc_rows = new_rows;
1145         } else
1146                 vc_resize(vc, new_cols, new_rows);
1147
1148         if (logo)
1149                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1150
1151         if (vc == svc && softback_buf)
1152                 fbcon_update_softback(vc);
1153
1154         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1155                 ops->rotate = FB_ROTATE_UR;
1156                 set_blitting_type(vc, info);
1157         }
1158
1159         ops->p = &fb_display[fg_console];
1160 }
1161
1162 static void fbcon_free_font(struct display *p)
1163 {
1164         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
1165                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
1166         p->fontdata = NULL;
1167         p->userfont = 0;
1168 }
1169
1170 static void fbcon_deinit(struct vc_data *vc)
1171 {
1172         struct display *p = &fb_display[vc->vc_num];
1173         struct fb_info *info;
1174         struct fbcon_ops *ops;
1175         int idx;
1176
1177         fbcon_free_font(p);
1178         idx = con2fb_map[vc->vc_num];
1179
1180         if (idx == -1)
1181                 goto finished;
1182
1183         info = registered_fb[idx];
1184
1185         if (!info)
1186                 goto finished;
1187
1188         ops = info->fbcon_par;
1189
1190         if (!ops)
1191                 goto finished;
1192
1193         if (CON_IS_VISIBLE(vc))
1194                 fbcon_del_cursor_timer(info);
1195
1196         ops->flags &= ~FBCON_FLAGS_INIT;
1197 finished:
1198
1199         if (!con_is_bound(&fb_con))
1200                 fbcon_exit();
1201
1202         return;
1203 }
1204
1205 /* ====================================================================== */
1206
1207 /*  fbcon_XXX routines - interface used by the world
1208  *
1209  *  This system is now divided into two levels because of complications
1210  *  caused by hardware scrolling. Top level functions:
1211  *
1212  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1213  *
1214  *  handles y values in range [0, scr_height-1] that correspond to real
1215  *  screen positions. y_wrap shift means that first line of bitmap may be
1216  *  anywhere on this display. These functions convert lineoffsets to
1217  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1218  *
1219  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1220  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1221  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1222  *
1223  *  WARNING:
1224  *
1225  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1226  *  Implies should only really hardware scroll in rows. Only reason for
1227  *  restriction is simplicity & efficiency at the moment.
1228  */
1229
1230 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1231                         int width)
1232 {
1233         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1234         struct fbcon_ops *ops = info->fbcon_par;
1235
1236         struct display *p = &fb_display[vc->vc_num];
1237         u_int y_break;
1238
1239         if (fbcon_is_inactive(vc, info))
1240                 return;
1241
1242         if (!height || !width)
1243                 return;
1244
1245         if (sy < vc->vc_top && vc->vc_top == logo_lines)
1246                 vc->vc_top = 0;
1247
1248         /* Split blits that cross physical y_wrap boundary */
1249
1250         y_break = p->vrows - p->yscroll;
1251         if (sy < y_break && sy + height - 1 >= y_break) {
1252                 u_int b = y_break - sy;
1253                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1254                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1255                                  width);
1256         } else
1257                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1258 }
1259
1260 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1261                         int count, int ypos, int xpos)
1262 {
1263         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1264         struct display *p = &fb_display[vc->vc_num];
1265         struct fbcon_ops *ops = info->fbcon_par;
1266
1267         if (!fbcon_is_inactive(vc, info))
1268                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1269                            get_color(vc, info, scr_readw(s), 1),
1270                            get_color(vc, info, scr_readw(s), 0));
1271 }
1272
1273 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1274 {
1275         unsigned short chr;
1276
1277         scr_writew(c, &chr);
1278         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1279 }
1280
1281 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1282 {
1283         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1284         struct fbcon_ops *ops = info->fbcon_par;
1285
1286         if (!fbcon_is_inactive(vc, info))
1287                 ops->clear_margins(vc, info, bottom_only);
1288 }
1289
1290 static void fbcon_cursor(struct vc_data *vc, int mode)
1291 {
1292         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1293         struct fbcon_ops *ops = info->fbcon_par;
1294         int y;
1295         int c = scr_readw((u16 *) vc->vc_pos);
1296
1297         if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
1298                 return;
1299
1300         if (vc->vc_cursor_type & 0x10)
1301                 fbcon_del_cursor_timer(info);
1302         else
1303                 fbcon_add_cursor_timer(info);
1304
1305         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1306         if (mode & CM_SOFTBACK) {
1307                 mode &= ~CM_SOFTBACK;
1308                 y = softback_lines;
1309         } else {
1310                 if (softback_lines)
1311                         fbcon_set_origin(vc);
1312                 y = 0;
1313         }
1314
1315         ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
1316                     get_color(vc, info, c, 0));
1317         vbl_cursor_cnt = CURSOR_DRAW_DELAY;
1318 }
1319
1320 static int scrollback_phys_max = 0;
1321 static int scrollback_max = 0;
1322 static int scrollback_current = 0;
1323
1324 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1325                            int unit)
1326 {
1327         struct display *p, *t;
1328         struct vc_data **default_mode, *vc;
1329         struct vc_data *svc;
1330         struct fbcon_ops *ops = info->fbcon_par;
1331         int rows, cols, charcnt = 256;
1332
1333         p = &fb_display[unit];
1334
1335         if (var_to_display(p, var, info))
1336                 return;
1337
1338         vc = vc_cons[unit].d;
1339
1340         if (!vc)
1341                 return;
1342
1343         default_mode = vc->vc_display_fg;
1344         svc = *default_mode;
1345         t = &fb_display[svc->vc_num];
1346
1347         if (!vc->vc_font.data) {
1348                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1349                 vc->vc_font.width = (*default_mode)->vc_font.width;
1350                 vc->vc_font.height = (*default_mode)->vc_font.height;
1351                 p->userfont = t->userfont;
1352                 if (p->userfont)
1353                         REFCOUNT(p->fontdata)++;
1354         }
1355         if (p->userfont)
1356                 charcnt = FNTCHARCNT(p->fontdata);
1357
1358         var->activate = FB_ACTIVATE_NOW;
1359         info->var.activate = var->activate;
1360         var->yoffset = info->var.yoffset;
1361         var->xoffset = info->var.xoffset;
1362         fb_set_var(info, var);
1363         ops->var = info->var;
1364         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1365         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1366         if (charcnt == 256) {
1367                 vc->vc_hi_font_mask = 0;
1368         } else {
1369                 vc->vc_hi_font_mask = 0x100;
1370                 if (vc->vc_can_do_color)
1371                         vc->vc_complement_mask <<= 1;
1372         }
1373
1374         if (!*svc->vc_uni_pagedir_loc)
1375                 con_set_default_unimap(svc);
1376         if (!*vc->vc_uni_pagedir_loc)
1377                 con_copy_unimap(vc, svc);
1378
1379         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1380         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1381         cols /= vc->vc_font.width;
1382         rows /= vc->vc_font.height;
1383         vc_resize(vc, cols, rows);
1384
1385         if (CON_IS_VISIBLE(vc)) {
1386                 update_screen(vc);
1387                 if (softback_buf)
1388                         fbcon_update_softback(vc);
1389         }
1390 }
1391
1392 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1393 {
1394         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1395         struct fbcon_ops *ops = info->fbcon_par;
1396         struct display *p = &fb_display[vc->vc_num];
1397
1398         p->yscroll += count;
1399         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1400                 p->yscroll -= p->vrows;
1401         ops->var.xoffset = 0;
1402         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1403         ops->var.vmode |= FB_VMODE_YWRAP;
1404         ops->update_start(info);
1405         scrollback_max += count;
1406         if (scrollback_max > scrollback_phys_max)
1407                 scrollback_max = scrollback_phys_max;
1408         scrollback_current = 0;
1409 }
1410
1411 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1412 {
1413         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1414         struct fbcon_ops *ops = info->fbcon_par;
1415         struct display *p = &fb_display[vc->vc_num];
1416
1417         p->yscroll -= count;
1418         if (p->yscroll < 0)     /* Deal with wrap */
1419                 p->yscroll += p->vrows;
1420         ops->var.xoffset = 0;
1421         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1422         ops->var.vmode |= FB_VMODE_YWRAP;
1423         ops->update_start(info);
1424         scrollback_max -= count;
1425         if (scrollback_max < 0)
1426                 scrollback_max = 0;
1427         scrollback_current = 0;
1428 }
1429
1430 static __inline__ void ypan_up(struct vc_data *vc, int count)
1431 {
1432         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1433         struct display *p = &fb_display[vc->vc_num];
1434         struct fbcon_ops *ops = info->fbcon_par;
1435
1436         p->yscroll += count;
1437         if (p->yscroll > p->vrows - vc->vc_rows) {
1438                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1439                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1440                 p->yscroll -= p->vrows - vc->vc_rows;
1441         }
1442
1443         ops->var.xoffset = 0;
1444         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1445         ops->var.vmode &= ~FB_VMODE_YWRAP;
1446         ops->update_start(info);
1447         fbcon_clear_margins(vc, 1);
1448         scrollback_max += count;
1449         if (scrollback_max > scrollback_phys_max)
1450                 scrollback_max = scrollback_phys_max;
1451         scrollback_current = 0;
1452 }
1453
1454 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1455 {
1456         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1457         struct fbcon_ops *ops = info->fbcon_par;
1458         struct display *p = &fb_display[vc->vc_num];
1459
1460         p->yscroll += count;
1461
1462         if (p->yscroll > p->vrows - vc->vc_rows) {
1463                 p->yscroll -= p->vrows - vc->vc_rows;
1464                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1465         }
1466
1467         ops->var.xoffset = 0;
1468         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1469         ops->var.vmode &= ~FB_VMODE_YWRAP;
1470         ops->update_start(info);
1471         fbcon_clear_margins(vc, 1);
1472         scrollback_max += count;
1473         if (scrollback_max > scrollback_phys_max)
1474                 scrollback_max = scrollback_phys_max;
1475         scrollback_current = 0;
1476 }
1477
1478 static __inline__ void ypan_down(struct vc_data *vc, int count)
1479 {
1480         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1481         struct display *p = &fb_display[vc->vc_num];
1482         struct fbcon_ops *ops = info->fbcon_par;
1483
1484         p->yscroll -= count;
1485         if (p->yscroll < 0) {
1486                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1487                             0, vc->vc_rows, vc->vc_cols);
1488                 p->yscroll += p->vrows - vc->vc_rows;
1489         }
1490
1491         ops->var.xoffset = 0;
1492         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1493         ops->var.vmode &= ~FB_VMODE_YWRAP;
1494         ops->update_start(info);
1495         fbcon_clear_margins(vc, 1);
1496         scrollback_max -= count;
1497         if (scrollback_max < 0)
1498                 scrollback_max = 0;
1499         scrollback_current = 0;
1500 }
1501
1502 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1503 {
1504         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1505         struct fbcon_ops *ops = info->fbcon_par;
1506         struct display *p = &fb_display[vc->vc_num];
1507
1508         p->yscroll -= count;
1509
1510         if (p->yscroll < 0) {
1511                 p->yscroll += p->vrows - vc->vc_rows;
1512                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1513         }
1514
1515         ops->var.xoffset = 0;
1516         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1517         ops->var.vmode &= ~FB_VMODE_YWRAP;
1518         ops->update_start(info);
1519         fbcon_clear_margins(vc, 1);
1520         scrollback_max -= count;
1521         if (scrollback_max < 0)
1522                 scrollback_max = 0;
1523         scrollback_current = 0;
1524 }
1525
1526 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1527                                   long delta)
1528 {
1529         int count = vc->vc_rows;
1530         unsigned short *d, *s;
1531         unsigned long n;
1532         int line = 0;
1533
1534         d = (u16 *) softback_curr;
1535         if (d == (u16 *) softback_in)
1536                 d = (u16 *) vc->vc_origin;
1537         n = softback_curr + delta * vc->vc_size_row;
1538         softback_lines -= delta;
1539         if (delta < 0) {
1540                 if (softback_curr < softback_top && n < softback_buf) {
1541                         n += softback_end - softback_buf;
1542                         if (n < softback_top) {
1543                                 softback_lines -=
1544                                     (softback_top - n) / vc->vc_size_row;
1545                                 n = softback_top;
1546                         }
1547                 } else if (softback_curr >= softback_top
1548                            && n < softback_top) {
1549                         softback_lines -=
1550                             (softback_top - n) / vc->vc_size_row;
1551                         n = softback_top;
1552                 }
1553         } else {
1554                 if (softback_curr > softback_in && n >= softback_end) {
1555                         n += softback_buf - softback_end;
1556                         if (n > softback_in) {
1557                                 n = softback_in;
1558                                 softback_lines = 0;
1559                         }
1560                 } else if (softback_curr <= softback_in && n > softback_in) {
1561                         n = softback_in;
1562                         softback_lines = 0;
1563                 }
1564         }
1565         if (n == softback_curr)
1566                 return;
1567         softback_curr = n;
1568         s = (u16 *) softback_curr;
1569         if (s == (u16 *) softback_in)
1570                 s = (u16 *) vc->vc_origin;
1571         while (count--) {
1572                 unsigned short *start;
1573                 unsigned short *le;
1574                 unsigned short c;
1575                 int x = 0;
1576                 unsigned short attr = 1;
1577
1578                 start = s;
1579                 le = advance_row(s, 1);
1580                 do {
1581                         c = scr_readw(s);
1582                         if (attr != (c & 0xff00)) {
1583                                 attr = c & 0xff00;
1584                                 if (s > start) {
1585                                         fbcon_putcs(vc, start, s - start,
1586                                                     line, x);
1587                                         x += s - start;
1588                                         start = s;
1589                                 }
1590                         }
1591                         if (c == scr_readw(d)) {
1592                                 if (s > start) {
1593                                         fbcon_putcs(vc, start, s - start,
1594                                                     line, x);
1595                                         x += s - start + 1;
1596                                         start = s + 1;
1597                                 } else {
1598                                         x++;
1599                                         start++;
1600                                 }
1601                         }
1602                         s++;
1603                         d++;
1604                 } while (s < le);
1605                 if (s > start)
1606                         fbcon_putcs(vc, start, s - start, line, x);
1607                 line++;
1608                 if (d == (u16 *) softback_end)
1609                         d = (u16 *) softback_buf;
1610                 if (d == (u16 *) softback_in)
1611                         d = (u16 *) vc->vc_origin;
1612                 if (s == (u16 *) softback_end)
1613                         s = (u16 *) softback_buf;
1614                 if (s == (u16 *) softback_in)
1615                         s = (u16 *) vc->vc_origin;
1616         }
1617 }
1618
1619 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1620                               int line, int count, int dy)
1621 {
1622         unsigned short *s = (unsigned short *)
1623                 (vc->vc_origin + vc->vc_size_row * line);
1624
1625         while (count--) {
1626                 unsigned short *start = s;
1627                 unsigned short *le = advance_row(s, 1);
1628                 unsigned short c;
1629                 int x = 0;
1630                 unsigned short attr = 1;
1631
1632                 do {
1633                         c = scr_readw(s);
1634                         if (attr != (c & 0xff00)) {
1635                                 attr = c & 0xff00;
1636                                 if (s > start) {
1637                                         fbcon_putcs(vc, start, s - start,
1638                                                     dy, x);
1639                                         x += s - start;
1640                                         start = s;
1641                                 }
1642                         }
1643                         console_conditional_schedule();
1644                         s++;
1645                 } while (s < le);
1646                 if (s > start)
1647                         fbcon_putcs(vc, start, s - start, dy, x);
1648                 console_conditional_schedule();
1649                 dy++;
1650         }
1651 }
1652
1653 static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
1654                         struct display *p, int line, int count, int ycount)
1655 {
1656         int offset = ycount * vc->vc_cols;
1657         unsigned short *d = (unsigned short *)
1658             (vc->vc_origin + vc->vc_size_row * line);
1659         unsigned short *s = d + offset;
1660         struct fbcon_ops *ops = info->fbcon_par;
1661
1662         while (count--) {
1663                 unsigned short *start = s;
1664                 unsigned short *le = advance_row(s, 1);
1665                 unsigned short c;
1666                 int x = 0;
1667
1668                 do {
1669                         c = scr_readw(s);
1670
1671                         if (c == scr_readw(d)) {
1672                                 if (s > start) {
1673                                         ops->bmove(vc, info, line + ycount, x,
1674                                                    line, x, 1, s-start);
1675                                         x += s - start + 1;
1676                                         start = s + 1;
1677                                 } else {
1678                                         x++;
1679                                         start++;
1680                                 }
1681                         }
1682
1683                         scr_writew(c, d);
1684                         console_conditional_schedule();
1685                         s++;
1686                         d++;
1687                 } while (s < le);
1688                 if (s > start)
1689                         ops->bmove(vc, info, line + ycount, x, line, x, 1,
1690                                    s-start);
1691                 console_conditional_schedule();
1692                 if (ycount > 0)
1693                         line++;
1694                 else {
1695                         line--;
1696                         /* NOTE: We subtract two lines from these pointers */
1697                         s -= vc->vc_size_row;
1698                         d -= vc->vc_size_row;
1699                 }
1700         }
1701 }
1702
1703 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1704                          int line, int count, int offset)
1705 {
1706         unsigned short *d = (unsigned short *)
1707             (vc->vc_origin + vc->vc_size_row * line);
1708         unsigned short *s = d + offset;
1709
1710         while (count--) {
1711                 unsigned short *start = s;
1712                 unsigned short *le = advance_row(s, 1);
1713                 unsigned short c;
1714                 int x = 0;
1715                 unsigned short attr = 1;
1716
1717                 do {
1718                         c = scr_readw(s);
1719                         if (attr != (c & 0xff00)) {
1720                                 attr = c & 0xff00;
1721                                 if (s > start) {
1722                                         fbcon_putcs(vc, start, s - start,
1723                                                     line, x);
1724                                         x += s - start;
1725                                         start = s;
1726                                 }
1727                         }
1728                         if (c == scr_readw(d)) {
1729                                 if (s > start) {
1730                                         fbcon_putcs(vc, start, s - start,
1731                                                      line, x);
1732                                         x += s - start + 1;
1733                                         start = s + 1;
1734                                 } else {
1735                                         x++;
1736                                         start++;
1737                                 }
1738                         }
1739                         scr_writew(c, d);
1740                         console_conditional_schedule();
1741                         s++;
1742                         d++;
1743                 } while (s < le);
1744                 if (s > start)
1745                         fbcon_putcs(vc, start, s - start, line, x);
1746                 console_conditional_schedule();
1747                 if (offset > 0)
1748                         line++;
1749                 else {
1750                         line--;
1751                         /* NOTE: We subtract two lines from these pointers */
1752                         s -= vc->vc_size_row;
1753                         d -= vc->vc_size_row;
1754                 }
1755         }
1756 }
1757
1758 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1759                                        int count)
1760 {
1761         unsigned short *p;
1762
1763         if (vc->vc_num != fg_console)
1764                 return;
1765         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1766
1767         while (count) {
1768                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1769                 count--;
1770                 p = advance_row(p, 1);
1771                 softback_in += vc->vc_size_row;
1772                 if (softback_in == softback_end)
1773                         softback_in = softback_buf;
1774                 if (softback_in == softback_top) {
1775                         softback_top += vc->vc_size_row;
1776                         if (softback_top == softback_end)
1777                                 softback_top = softback_buf;
1778                 }
1779         }
1780         softback_curr = softback_in;
1781 }
1782
1783 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1784                         int count)
1785 {
1786         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1787         struct display *p = &fb_display[vc->vc_num];
1788         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1789
1790         if (fbcon_is_inactive(vc, info))
1791                 return -EINVAL;
1792
1793         fbcon_cursor(vc, CM_ERASE);
1794
1795         /*
1796          * ++Geert: Only use ywrap/ypan if the console is in text mode
1797          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1798          *           whole screen (prevents flicker).
1799          */
1800
1801         switch (dir) {
1802         case SM_UP:
1803                 if (count > vc->vc_rows)        /* Maximum realistic size */
1804                         count = vc->vc_rows;
1805                 if (softback_top)
1806                         fbcon_softback_note(vc, t, count);
1807                 if (logo_shown >= 0)
1808                         goto redraw_up;
1809                 switch (p->scrollmode) {
1810                 case SCROLL_MOVE:
1811                         fbcon_redraw_blit(vc, info, p, t, b - t - count,
1812                                      count);
1813                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1814                         scr_memsetw((unsigned short *) (vc->vc_origin +
1815                                                         vc->vc_size_row *
1816                                                         (b - count)),
1817                                     vc->vc_video_erase_char,
1818                                     vc->vc_size_row * count);
1819                         return 1;
1820                         break;
1821
1822                 case SCROLL_WRAP_MOVE:
1823                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1824                                 if (t > 0)
1825                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1826                                                     vc->vc_cols);
1827                                 ywrap_up(vc, count);
1828                                 if (vc->vc_rows - b > 0)
1829                                         fbcon_bmove(vc, b - count, 0, b, 0,
1830                                                     vc->vc_rows - b,
1831                                                     vc->vc_cols);
1832                         } else if (info->flags & FBINFO_READS_FAST)
1833                                 fbcon_bmove(vc, t + count, 0, t, 0,
1834                                             b - t - count, vc->vc_cols);
1835                         else
1836                                 goto redraw_up;
1837                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1838                         break;
1839
1840                 case SCROLL_PAN_REDRAW:
1841                         if ((p->yscroll + count <=
1842                              2 * (p->vrows - vc->vc_rows))
1843                             && ((!scroll_partial && (b - t == vc->vc_rows))
1844                                 || (scroll_partial
1845                                     && (b - t - count >
1846                                         3 * vc->vc_rows >> 2)))) {
1847                                 if (t > 0)
1848                                         fbcon_redraw_move(vc, p, 0, t, count);
1849                                 ypan_up_redraw(vc, t, count);
1850                                 if (vc->vc_rows - b > 0)
1851                                         fbcon_redraw_move(vc, p, b,
1852                                                           vc->vc_rows - b, b);
1853                         } else
1854                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1855                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1856                         break;
1857
1858                 case SCROLL_PAN_MOVE:
1859                         if ((p->yscroll + count <=
1860                              2 * (p->vrows - vc->vc_rows))
1861                             && ((!scroll_partial && (b - t == vc->vc_rows))
1862                                 || (scroll_partial
1863                                     && (b - t - count >
1864                                         3 * vc->vc_rows >> 2)))) {
1865                                 if (t > 0)
1866                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1867                                                     vc->vc_cols);
1868                                 ypan_up(vc, count);
1869                                 if (vc->vc_rows - b > 0)
1870                                         fbcon_bmove(vc, b - count, 0, b, 0,
1871                                                     vc->vc_rows - b,
1872                                                     vc->vc_cols);
1873                         } else if (info->flags & FBINFO_READS_FAST)
1874                                 fbcon_bmove(vc, t + count, 0, t, 0,
1875                                             b - t - count, vc->vc_cols);
1876                         else
1877                                 goto redraw_up;
1878                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1879                         break;
1880
1881                 case SCROLL_REDRAW:
1882                       redraw_up:
1883                         fbcon_redraw(vc, p, t, b - t - count,
1884                                      count * vc->vc_cols);
1885                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1886                         scr_memsetw((unsigned short *) (vc->vc_origin +
1887                                                         vc->vc_size_row *
1888                                                         (b - count)),
1889                                     vc->vc_video_erase_char,
1890                                     vc->vc_size_row * count);
1891                         return 1;
1892                 }
1893                 break;
1894
1895         case SM_DOWN:
1896                 if (count > vc->vc_rows)        /* Maximum realistic size */
1897                         count = vc->vc_rows;
1898                 if (logo_shown >= 0)
1899                         goto redraw_down;
1900                 switch (p->scrollmode) {
1901                 case SCROLL_MOVE:
1902                         fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
1903                                      -count);
1904                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1905                         scr_memsetw((unsigned short *) (vc->vc_origin +
1906                                                         vc->vc_size_row *
1907                                                         t),
1908                                     vc->vc_video_erase_char,
1909                                     vc->vc_size_row * count);
1910                         return 1;
1911                         break;
1912
1913                 case SCROLL_WRAP_MOVE:
1914                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1915                                 if (vc->vc_rows - b > 0)
1916                                         fbcon_bmove(vc, b, 0, b - count, 0,
1917                                                     vc->vc_rows - b,
1918                                                     vc->vc_cols);
1919                                 ywrap_down(vc, count);
1920                                 if (t > 0)
1921                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1922                                                     vc->vc_cols);
1923                         } else if (info->flags & FBINFO_READS_FAST)
1924                                 fbcon_bmove(vc, t, 0, t + count, 0,
1925                                             b - t - count, vc->vc_cols);
1926                         else
1927                                 goto redraw_down;
1928                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1929                         break;
1930
1931                 case SCROLL_PAN_MOVE:
1932                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1933                             && ((!scroll_partial && (b - t == vc->vc_rows))
1934                                 || (scroll_partial
1935                                     && (b - t - count >
1936                                         3 * vc->vc_rows >> 2)))) {
1937                                 if (vc->vc_rows - b > 0)
1938                                         fbcon_bmove(vc, b, 0, b - count, 0,
1939                                                     vc->vc_rows - b,
1940                                                     vc->vc_cols);
1941                                 ypan_down(vc, count);
1942                                 if (t > 0)
1943                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1944                                                     vc->vc_cols);
1945                         } else if (info->flags & FBINFO_READS_FAST)
1946                                 fbcon_bmove(vc, t, 0, t + count, 0,
1947                                             b - t - count, vc->vc_cols);
1948                         else
1949                                 goto redraw_down;
1950                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1951                         break;
1952
1953                 case SCROLL_PAN_REDRAW:
1954                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1955                             && ((!scroll_partial && (b - t == vc->vc_rows))
1956                                 || (scroll_partial
1957                                     && (b - t - count >
1958                                         3 * vc->vc_rows >> 2)))) {
1959                                 if (vc->vc_rows - b > 0)
1960                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1961                                                           b - count);
1962                                 ypan_down_redraw(vc, t, count);
1963                                 if (t > 0)
1964                                         fbcon_redraw_move(vc, p, count, t, 0);
1965                         } else
1966                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1967                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1968                         break;
1969
1970                 case SCROLL_REDRAW:
1971                       redraw_down:
1972                         fbcon_redraw(vc, p, b - 1, b - t - count,
1973                                      -count * vc->vc_cols);
1974                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1975                         scr_memsetw((unsigned short *) (vc->vc_origin +
1976                                                         vc->vc_size_row *
1977                                                         t),
1978                                     vc->vc_video_erase_char,
1979                                     vc->vc_size_row * count);
1980                         return 1;
1981                 }
1982         }
1983         return 0;
1984 }
1985
1986
1987 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1988                         int height, int width)
1989 {
1990         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1991         struct display *p = &fb_display[vc->vc_num];
1992
1993         if (fbcon_is_inactive(vc, info))
1994                 return;
1995
1996         if (!width || !height)
1997                 return;
1998
1999         /*  Split blits that cross physical y_wrap case.
2000          *  Pathological case involves 4 blits, better to use recursive
2001          *  code rather than unrolled case
2002          *
2003          *  Recursive invocations don't need to erase the cursor over and
2004          *  over again, so we use fbcon_bmove_rec()
2005          */
2006         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
2007                         p->vrows - p->yscroll);
2008 }
2009
2010 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
2011                             int dy, int dx, int height, int width, u_int y_break)
2012 {
2013         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2014         struct fbcon_ops *ops = info->fbcon_par;
2015         u_int b;
2016
2017         if (sy < y_break && sy + height > y_break) {
2018                 b = y_break - sy;
2019                 if (dy < sy) {  /* Avoid trashing self */
2020                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2021                                         y_break);
2022                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2023                                         height - b, width, y_break);
2024                 } else {
2025                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2026                                         height - b, width, y_break);
2027                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2028                                         y_break);
2029                 }
2030                 return;
2031         }
2032
2033         if (dy < y_break && dy + height > y_break) {
2034                 b = y_break - dy;
2035                 if (dy < sy) {  /* Avoid trashing self */
2036                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2037                                         y_break);
2038                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2039                                         height - b, width, y_break);
2040                 } else {
2041                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2042                                         height - b, width, y_break);
2043                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2044                                         y_break);
2045                 }
2046                 return;
2047         }
2048         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
2049                    height, width);
2050 }
2051
2052 static void updatescrollmode(struct display *p,
2053                                         struct fb_info *info,
2054                                         struct vc_data *vc)
2055 {
2056         struct fbcon_ops *ops = info->fbcon_par;
2057         int fh = vc->vc_font.height;
2058         int cap = info->flags;
2059         u16 t = 0;
2060         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
2061                                   info->fix.xpanstep);
2062         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
2063         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2064         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
2065                                    info->var.xres_virtual);
2066         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
2067                 divides(ypan, vc->vc_font.height) && vyres > yres;
2068         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
2069                 divides(ywrap, vc->vc_font.height) &&
2070                 divides(vc->vc_font.height, vyres) &&
2071                 divides(vc->vc_font.height, yres);
2072         int reading_fast = cap & FBINFO_READS_FAST;
2073         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
2074                 !(cap & FBINFO_HWACCEL_DISABLED);
2075         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
2076                 !(cap & FBINFO_HWACCEL_DISABLED);
2077
2078         p->vrows = vyres/fh;
2079         if (yres > (fh * (vc->vc_rows + 1)))
2080                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
2081         if ((yres % fh) && (vyres % fh < yres % fh))
2082                 p->vrows--;
2083
2084         if (good_wrap || good_pan) {
2085                 if (reading_fast || fast_copyarea)
2086                         p->scrollmode = good_wrap ?
2087                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
2088                 else
2089                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
2090                                 SCROLL_PAN_REDRAW;
2091         } else {
2092                 if (reading_fast || (fast_copyarea && !fast_imageblit))
2093                         p->scrollmode = SCROLL_MOVE;
2094                 else
2095                         p->scrollmode = SCROLL_REDRAW;
2096         }
2097 }
2098
2099 static int fbcon_resize(struct vc_data *vc, unsigned int width,
2100                         unsigned int height, unsigned int user)
2101 {
2102         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2103         struct fbcon_ops *ops = info->fbcon_par;
2104         struct display *p = &fb_display[vc->vc_num];
2105         struct fb_var_screeninfo var = info->var;
2106         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2107
2108         virt_w = FBCON_SWAP(ops->rotate, width, height);
2109         virt_h = FBCON_SWAP(ops->rotate, height, width);
2110         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2111                                  vc->vc_font.height);
2112         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2113                                  vc->vc_font.width);
2114         var.xres = virt_w * virt_fw;
2115         var.yres = virt_h * virt_fh;
2116         x_diff = info->var.xres - var.xres;
2117         y_diff = info->var.yres - var.yres;
2118         if (x_diff < 0 || x_diff > virt_fw ||
2119             y_diff < 0 || y_diff > virt_fh) {
2120                 const struct fb_videomode *mode;
2121
2122                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2123                 mode = fb_find_best_mode(&var, &info->modelist);
2124                 if (mode == NULL)
2125                         return -EINVAL;
2126                 display_to_var(&var, p);
2127                 fb_videomode_to_var(&var, mode);
2128
2129                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2130                         return -EINVAL;
2131
2132                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2133                 if (CON_IS_VISIBLE(vc)) {
2134                         var.activate = FB_ACTIVATE_NOW |
2135                                 FB_ACTIVATE_FORCE;
2136                         fb_set_var(info, &var);
2137                 }
2138                 var_to_display(p, &info->var, info);
2139                 ops->var = info->var;
2140         }
2141         updatescrollmode(p, info, vc);
2142         return 0;
2143 }
2144
2145 static int fbcon_switch(struct vc_data *vc)
2146 {
2147         struct fb_info *info, *old_info = NULL;
2148         struct fbcon_ops *ops;
2149         struct display *p = &fb_display[vc->vc_num];
2150         struct fb_var_screeninfo var;
2151         int i, ret, prev_console, charcnt = 256;
2152
2153         info = registered_fb[con2fb_map[vc->vc_num]];
2154         ops = info->fbcon_par;
2155
2156         if (softback_top) {
2157                 if (softback_lines)
2158                         fbcon_set_origin(vc);
2159                 softback_top = softback_curr = softback_in = softback_buf;
2160                 softback_lines = 0;
2161                 fbcon_update_softback(vc);
2162         }
2163
2164         if (logo_shown >= 0) {
2165                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2166
2167                 if (conp2->vc_top == logo_lines
2168                     && conp2->vc_bottom == conp2->vc_rows)
2169                         conp2->vc_top = 0;
2170                 logo_shown = FBCON_LOGO_CANSHOW;
2171         }
2172
2173         prev_console = ops->currcon;
2174         if (prev_console != -1)
2175                 old_info = registered_fb[con2fb_map[prev_console]];
2176         /*
2177          * FIXME: If we have multiple fbdev's loaded, we need to
2178          * update all info->currcon.  Perhaps, we can place this
2179          * in a centralized structure, but this might break some
2180          * drivers.
2181          *
2182          * info->currcon = vc->vc_num;
2183          */
2184         for (i = 0; i < FB_MAX; i++) {
2185                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2186                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2187
2188                         o->currcon = vc->vc_num;
2189                 }
2190         }
2191         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2192         display_to_var(&var, p);
2193         var.activate = FB_ACTIVATE_NOW;
2194
2195         /*
2196          * make sure we don't unnecessarily trip the memcmp()
2197          * in fb_set_var()
2198          */
2199         info->var.activate = var.activate;
2200         var.vmode |= info->var.vmode & ~FB_VMODE_MASK;
2201         fb_set_var(info, &var);
2202         ops->var = info->var;
2203
2204         if (old_info != NULL && (old_info != info ||
2205                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2206                 if (info->fbops->fb_set_par) {
2207                         ret = info->fbops->fb_set_par(info);
2208
2209                         if (ret)
2210                                 printk(KERN_ERR "fbcon_switch: detected "
2211                                         "unhandled fb_set_par error, "
2212                                         "error code %d\n", ret);
2213                 }
2214
2215                 if (old_info != info)
2216                         fbcon_del_cursor_timer(old_info);
2217         }
2218
2219         if (fbcon_is_inactive(vc, info) ||
2220             ops->blank_state != FB_BLANK_UNBLANK)
2221                 fbcon_del_cursor_timer(info);
2222         else
2223                 fbcon_add_cursor_timer(info);
2224
2225         set_blitting_type(vc, info);
2226         ops->cursor_reset = 1;
2227
2228         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2229                 ops->rotate = FB_ROTATE_UR;
2230                 set_blitting_type(vc, info);
2231         }
2232
2233         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2234         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2235
2236         if (p->userfont)
2237                 charcnt = FNTCHARCNT(vc->vc_font.data);
2238
2239         if (charcnt > 256)
2240                 vc->vc_complement_mask <<= 1;
2241
2242         updatescrollmode(p, info, vc);
2243
2244         switch (p->scrollmode) {
2245         case SCROLL_WRAP_MOVE:
2246                 scrollback_phys_max = p->vrows - vc->vc_rows;
2247                 break;
2248         case SCROLL_PAN_MOVE:
2249         case SCROLL_PAN_REDRAW:
2250                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2251                 if (scrollback_phys_max < 0)
2252                         scrollback_phys_max = 0;
2253                 break;
2254         default:
2255                 scrollback_phys_max = 0;
2256                 break;
2257         }
2258
2259         scrollback_max = 0;
2260         scrollback_current = 0;
2261
2262         if (!fbcon_is_inactive(vc, info)) {
2263             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2264             ops->update_start(info);
2265         }
2266
2267         fbcon_set_palette(vc, color_table);
2268         fbcon_clear_margins(vc, 0);
2269
2270         if (logo_shown == FBCON_LOGO_DRAW) {
2271
2272                 logo_shown = fg_console;
2273                 /* This is protected above by initmem_freed */
2274                 fb_show_logo(info, ops->rotate);
2275                 update_region(vc,
2276                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2277                               vc->vc_size_row * (vc->vc_bottom -
2278                                                  vc->vc_top) / 2);
2279                 return 0;
2280         }
2281         return 1;
2282 }
2283
2284 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2285                                 int blank)
2286 {
2287         struct fb_event event;
2288
2289         if (blank) {
2290                 unsigned short charmask = vc->vc_hi_font_mask ?
2291                         0x1ff : 0xff;
2292                 unsigned short oldc;
2293
2294                 oldc = vc->vc_video_erase_char;
2295                 vc->vc_video_erase_char &= charmask;
2296                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2297                 vc->vc_video_erase_char = oldc;
2298         }
2299
2300
2301         if (!lock_fb_info(info))
2302                 return;
2303         event.info = info;
2304         event.data = &blank;
2305         fb_notifier_call_chain(FB_EVENT_CONBLANK, &event);
2306         unlock_fb_info(info);
2307 }
2308
2309 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2310 {
2311         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2312         struct fbcon_ops *ops = info->fbcon_par;
2313
2314         if (mode_switch) {
2315                 struct fb_var_screeninfo var = info->var;
2316
2317                 ops->graphics = 1;
2318
2319                 if (!blank) {
2320                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2321                         fb_set_var(info, &var);
2322                         ops->graphics = 0;
2323                         ops->var = info->var;
2324                 }
2325         }
2326
2327         if (!fbcon_is_inactive(vc, info)) {
2328                 if (ops->blank_state != blank) {
2329                         ops->blank_state = blank;
2330                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2331                         ops->cursor_flash = (!blank);
2332
2333                         if (!(info->flags & FBINFO_MISC_USEREVENT))
2334                                 if (fb_blank(info, blank))
2335                                         fbcon_generic_blank(vc, info, blank);
2336                 }
2337
2338                 if (!blank)
2339                         update_screen(vc);
2340         }
2341
2342         if (mode_switch || fbcon_is_inactive(vc, info) ||
2343             ops->blank_state != FB_BLANK_UNBLANK)
2344                 fbcon_del_cursor_timer(info);
2345         else
2346                 fbcon_add_cursor_timer(info);
2347
2348         return 0;
2349 }
2350
2351 static int fbcon_debug_enter(struct vc_data *vc)
2352 {
2353         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2354         struct fbcon_ops *ops = info->fbcon_par;
2355
2356         ops->save_graphics = ops->graphics;
2357         ops->graphics = 0;
2358         if (info->fbops->fb_debug_enter)
2359                 info->fbops->fb_debug_enter(info);
2360         fbcon_set_palette(vc, color_table);
2361         return 0;
2362 }
2363
2364 static int fbcon_debug_leave(struct vc_data *vc)
2365 {
2366         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2367         struct fbcon_ops *ops = info->fbcon_par;
2368
2369         ops->graphics = ops->save_graphics;
2370         if (info->fbops->fb_debug_leave)
2371                 info->fbops->fb_debug_leave(info);
2372         return 0;
2373 }
2374
2375 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2376 {
2377         u8 *fontdata = vc->vc_font.data;
2378         u8 *data = font->data;
2379         int i, j;
2380
2381         font->width = vc->vc_font.width;
2382         font->height = vc->vc_font.height;
2383         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2384         if (!font->data)
2385                 return 0;
2386
2387         if (font->width <= 8) {
2388                 j = vc->vc_font.height;
2389                 for (i = 0; i < font->charcount; i++) {
2390                         memcpy(data, fontdata, j);
2391                         memset(data + j, 0, 32 - j);
2392                         data += 32;
2393                         fontdata += j;
2394                 }
2395         } else if (font->width <= 16) {
2396                 j = vc->vc_font.height * 2;
2397                 for (i = 0; i < font->charcount; i++) {
2398                         memcpy(data, fontdata, j);
2399                         memset(data + j, 0, 64 - j);
2400                         data += 64;
2401                         fontdata += j;
2402                 }
2403         } else if (font->width <= 24) {
2404                 for (i = 0; i < font->charcount; i++) {
2405                         for (j = 0; j < vc->vc_font.height; j++) {
2406                                 *data++ = fontdata[0];
2407                                 *data++ = fontdata[1];
2408                                 *data++ = fontdata[2];
2409                                 fontdata += sizeof(u32);
2410                         }
2411                         memset(data, 0, 3 * (32 - j));
2412                         data += 3 * (32 - j);
2413                 }
2414         } else {
2415                 j = vc->vc_font.height * 4;
2416                 for (i = 0; i < font->charcount; i++) {
2417                         memcpy(data, fontdata, j);
2418                         memset(data + j, 0, 128 - j);
2419                         data += 128;
2420                         fontdata += j;
2421                 }
2422         }
2423         return 0;
2424 }
2425
2426 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2427                              const u8 * data, int userfont)
2428 {
2429         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2430         struct fbcon_ops *ops = info->fbcon_par;
2431         struct display *p = &fb_display[vc->vc_num];
2432         int resize;
2433         int cnt;
2434         char *old_data = NULL;
2435
2436         if (CON_IS_VISIBLE(vc) && softback_lines)
2437                 fbcon_set_origin(vc);
2438
2439         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2440         if (p->userfont)
2441                 old_data = vc->vc_font.data;
2442         if (userfont)
2443                 cnt = FNTCHARCNT(data);
2444         else
2445                 cnt = 256;
2446         vc->vc_font.data = (void *)(p->fontdata = data);
2447         if ((p->userfont = userfont))
2448                 REFCOUNT(data)++;
2449         vc->vc_font.width = w;
2450         vc->vc_font.height = h;
2451         if (vc->vc_hi_font_mask && cnt == 256) {
2452                 vc->vc_hi_font_mask = 0;
2453                 if (vc->vc_can_do_color) {
2454                         vc->vc_complement_mask >>= 1;
2455                         vc->vc_s_complement_mask >>= 1;
2456                 }
2457
2458                 /* ++Edmund: reorder the attribute bits */
2459                 if (vc->vc_can_do_color) {
2460                         unsigned short *cp =
2461                             (unsigned short *) vc->vc_origin;
2462                         int count = vc->vc_screenbuf_size / 2;
2463                         unsigned short c;
2464                         for (; count > 0; count--, cp++) {
2465                                 c = scr_readw(cp);
2466                                 scr_writew(((c & 0xfe00) >> 1) |
2467                                            (c & 0xff), cp);
2468                         }
2469                         c = vc->vc_video_erase_char;
2470                         vc->vc_video_erase_char =
2471                             ((c & 0xfe00) >> 1) | (c & 0xff);
2472                         vc->vc_attr >>= 1;
2473                 }
2474         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2475                 vc->vc_hi_font_mask = 0x100;
2476                 if (vc->vc_can_do_color) {
2477                         vc->vc_complement_mask <<= 1;
2478                         vc->vc_s_complement_mask <<= 1;
2479                 }
2480
2481                 /* ++Edmund: reorder the attribute bits */
2482                 {
2483                         unsigned short *cp =
2484                             (unsigned short *) vc->vc_origin;
2485                         int count = vc->vc_screenbuf_size / 2;
2486                         unsigned short c;
2487                         for (; count > 0; count--, cp++) {
2488                                 unsigned short newc;
2489                                 c = scr_readw(cp);
2490                                 if (vc->vc_can_do_color)
2491                                         newc =
2492                                             ((c & 0xff00) << 1) | (c &
2493                                                                    0xff);
2494                                 else
2495                                         newc = c & ~0x100;
2496                                 scr_writew(newc, cp);
2497                         }
2498                         c = vc->vc_video_erase_char;
2499                         if (vc->vc_can_do_color) {
2500                                 vc->vc_video_erase_char =
2501                                     ((c & 0xff00) << 1) | (c & 0xff);
2502                                 vc->vc_attr <<= 1;
2503                         } else
2504                                 vc->vc_video_erase_char = c & ~0x100;
2505                 }
2506
2507         }
2508
2509         if (resize) {
2510                 int cols, rows;
2511
2512                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2513                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2514                 cols /= w;
2515                 rows /= h;
2516                 vc_resize(vc, cols, rows);
2517                 if (CON_IS_VISIBLE(vc) && softback_buf)
2518                         fbcon_update_softback(vc);
2519         } else if (CON_IS_VISIBLE(vc)
2520                    && vc->vc_mode == KD_TEXT) {
2521                 fbcon_clear_margins(vc, 0);
2522                 update_screen(vc);
2523         }
2524
2525         if (old_data && (--REFCOUNT(old_data) == 0))
2526                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2527         return 0;
2528 }
2529
2530 static int fbcon_copy_font(struct vc_data *vc, int con)
2531 {
2532         struct display *od = &fb_display[con];
2533         struct console_font *f = &vc->vc_font;
2534
2535         if (od->fontdata == f->data)
2536                 return 0;       /* already the same font... */
2537         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2538 }
2539
2540 /*
2541  *  User asked to set font; we are guaranteed that
2542  *      a) width and height are in range 1..32
2543  *      b) charcount does not exceed 512
2544  *  but lets not assume that, since someone might someday want to use larger
2545  *  fonts. And charcount of 512 is small for unicode support.
2546  *
2547  *  However, user space gives the font in 32 rows , regardless of
2548  *  actual font height. So a new API is needed if support for larger fonts
2549  *  is ever implemented.
2550  */
2551
2552 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2553 {
2554         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2555         unsigned charcount = font->charcount;
2556         int w = font->width;
2557         int h = font->height;
2558         int size;
2559         int i, csum;
2560         u8 *new_data, *data = font->data;
2561         int pitch = (font->width+7) >> 3;
2562
2563         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2564          * If not this check should be changed to charcount < 256 */
2565         if (charcount != 256 && charcount != 512)
2566                 return -EINVAL;
2567
2568         /* Make sure drawing engine can handle the font */
2569         if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
2570             !(info->pixmap.blit_y & (1 << (font->height - 1))))
2571                 return -EINVAL;
2572
2573         /* Make sure driver can handle the font length */
2574         if (fbcon_invalid_charcount(info, charcount))
2575                 return -EINVAL;
2576
2577         size = h * pitch * charcount;
2578
2579         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2580
2581         if (!new_data)
2582                 return -ENOMEM;
2583
2584         new_data += FONT_EXTRA_WORDS * sizeof(int);
2585         FNTSIZE(new_data) = size;
2586         FNTCHARCNT(new_data) = charcount;
2587         REFCOUNT(new_data) = 0; /* usage counter */
2588         for (i=0; i< charcount; i++) {
2589                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2590         }
2591
2592         /* Since linux has a nice crc32 function use it for counting font
2593          * checksums. */
2594         csum = crc32(0, new_data, size);
2595
2596         FNTSUM(new_data) = csum;
2597         /* Check if the same font is on some other console already */
2598         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2599                 struct vc_data *tmp = vc_cons[i].d;
2600
2601                 if (fb_display[i].userfont &&
2602                     fb_display[i].fontdata &&
2603                     FNTSUM(fb_display[i].fontdata) == csum &&
2604                     FNTSIZE(fb_display[i].fontdata) == size &&
2605                     tmp->vc_font.width == w &&
2606                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2607                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2608                         new_data = (u8 *)fb_display[i].fontdata;
2609                         break;
2610                 }
2611         }
2612         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2613 }
2614
2615 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2616 {
2617         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2618         const struct font_desc *f;
2619
2620         if (!name)
2621                 f = get_default_font(info->var.xres, info->var.yres,
2622                                      info->pixmap.blit_x, info->pixmap.blit_y);
2623         else if (!(f = find_font(name)))
2624                 return -ENOENT;
2625
2626         font->width = f->width;
2627         font->height = f->height;
2628         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2629 }
2630
2631 static u16 palette_red[16];
2632 static u16 palette_green[16];
2633 static u16 palette_blue[16];
2634
2635 static struct fb_cmap palette_cmap = {
2636         0, 16, palette_red, palette_green, palette_blue, NULL
2637 };
2638
2639 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
2640 {
2641         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2642         int i, j, k, depth;
2643         u8 val;
2644
2645         if (fbcon_is_inactive(vc, info))
2646                 return -EINVAL;
2647
2648         if (!CON_IS_VISIBLE(vc))
2649                 return 0;
2650
2651         depth = fb_get_color_depth(&info->var, &info->fix);
2652         if (depth > 3) {
2653                 for (i = j = 0; i < 16; i++) {
2654                         k = table[i];
2655                         val = vc->vc_palette[j++];
2656                         palette_red[k] = (val << 8) | val;
2657                         val = vc->vc_palette[j++];
2658                         palette_green[k] = (val << 8) | val;
2659                         val = vc->vc_palette[j++];
2660                         palette_blue[k] = (val << 8) | val;
2661                 }
2662                 palette_cmap.len = 16;
2663                 palette_cmap.start = 0;
2664         /*
2665          * If framebuffer is capable of less than 16 colors,
2666          * use default palette of fbcon.
2667          */
2668         } else
2669                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2670
2671         return fb_set_cmap(&palette_cmap, info);
2672 }
2673
2674 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2675 {
2676         unsigned long p;
2677         int line;
2678
2679         if (vc->vc_num != fg_console || !softback_lines)
2680                 return (u16 *) (vc->vc_origin + offset);
2681         line = offset / vc->vc_size_row;
2682         if (line >= softback_lines)
2683                 return (u16 *) (vc->vc_origin + offset -
2684                                 softback_lines * vc->vc_size_row);
2685         p = softback_curr + offset;
2686         if (p >= softback_end)
2687                 p += softback_buf - softback_end;
2688         return (u16 *) p;
2689 }
2690
2691 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2692                                  int *px, int *py)
2693 {
2694         unsigned long ret;
2695         int x, y;
2696
2697         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2698                 unsigned long offset = (pos - vc->vc_origin) / 2;
2699
2700                 x = offset % vc->vc_cols;
2701                 y = offset / vc->vc_cols;
2702                 if (vc->vc_num == fg_console)
2703                         y += softback_lines;
2704                 ret = pos + (vc->vc_cols - x) * 2;
2705         } else if (vc->vc_num == fg_console && softback_lines) {
2706                 unsigned long offset = pos - softback_curr;
2707
2708                 if (pos < softback_curr)
2709                         offset += softback_end - softback_buf;
2710                 offset /= 2;
2711                 x = offset % vc->vc_cols;
2712                 y = offset / vc->vc_cols;
2713                 ret = pos + (vc->vc_cols - x) * 2;
2714                 if (ret == softback_end)
2715                         ret = softback_buf;
2716                 if (ret == softback_in)
2717                         ret = vc->vc_origin;
2718         } else {
2719                 /* Should not happen */
2720                 x = y = 0;
2721                 ret = vc->vc_origin;
2722         }
2723         if (px)
2724                 *px = x;
2725         if (py)
2726                 *py = y;
2727         return ret;
2728 }
2729
2730 /* As we might be inside of softback, we may work with non-contiguous buffer,
2731    that's why we have to use a separate routine. */
2732 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2733 {
2734         while (cnt--) {
2735                 u16 a = scr_readw(p);
2736                 if (!vc->vc_can_do_color)
2737                         a ^= 0x0800;
2738                 else if (vc->vc_hi_font_mask == 0x100)
2739                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2740                             (((a) & 0x0e00) << 4);
2741                 else
2742                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2743                             (((a) & 0x0700) << 4);
2744                 scr_writew(a, p++);
2745                 if (p == (u16 *) softback_end)
2746                         p = (u16 *) softback_buf;
2747                 if (p == (u16 *) softback_in)
2748                         p = (u16 *) vc->vc_origin;
2749         }
2750 }
2751
2752 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
2753 {
2754         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2755         struct fbcon_ops *ops = info->fbcon_par;
2756         struct display *disp = &fb_display[fg_console];
2757         int offset, limit, scrollback_old;
2758
2759         if (softback_top) {
2760                 if (vc->vc_num != fg_console)
2761                         return 0;
2762                 if (vc->vc_mode != KD_TEXT || !lines)
2763                         return 0;
2764                 if (logo_shown >= 0) {
2765                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2766
2767                         if (conp2->vc_top == logo_lines
2768                             && conp2->vc_bottom == conp2->vc_rows)
2769                                 conp2->vc_top = 0;
2770                         if (logo_shown == vc->vc_num) {
2771                                 unsigned long p, q;
2772                                 int i;
2773
2774                                 p = softback_in;
2775                                 q = vc->vc_origin +
2776                                     logo_lines * vc->vc_size_row;
2777                                 for (i = 0; i < logo_lines; i++) {
2778                                         if (p == softback_top)
2779                                                 break;
2780                                         if (p == softback_buf)
2781                                                 p = softback_end;
2782                                         p -= vc->vc_size_row;
2783                                         q -= vc->vc_size_row;
2784                                         scr_memcpyw((u16 *) q, (u16 *) p,
2785                                                     vc->vc_size_row);
2786                                 }
2787                                 softback_in = softback_curr = p;
2788                                 update_region(vc, vc->vc_origin,
2789                                               logo_lines * vc->vc_cols);
2790                         }
2791                         logo_shown = FBCON_LOGO_CANSHOW;
2792                 }
2793                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2794                 fbcon_redraw_softback(vc, disp, lines);
2795                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2796                 return 0;
2797         }
2798
2799         if (!scrollback_phys_max)
2800                 return -ENOSYS;
2801
2802         scrollback_old = scrollback_current;
2803         scrollback_current -= lines;
2804         if (scrollback_current < 0)
2805                 scrollback_current = 0;
2806         else if (scrollback_current > scrollback_max)
2807                 scrollback_current = scrollback_max;
2808         if (scrollback_current == scrollback_old)
2809                 return 0;
2810
2811         if (fbcon_is_inactive(vc, info))
2812                 return 0;
2813
2814         fbcon_cursor(vc, CM_ERASE);
2815
2816         offset = disp->yscroll - scrollback_current;
2817         limit = disp->vrows;
2818         switch (disp->scrollmode) {
2819         case SCROLL_WRAP_MOVE:
2820                 info->var.vmode |= FB_VMODE_YWRAP;
2821                 break;
2822         case SCROLL_PAN_MOVE:
2823         case SCROLL_PAN_REDRAW:
2824                 limit -= vc->vc_rows;
2825                 info->var.vmode &= ~FB_VMODE_YWRAP;
2826                 break;
2827         }
2828         if (offset < 0)
2829                 offset += limit;
2830         else if (offset >= limit)
2831                 offset -= limit;
2832
2833         ops->var.xoffset = 0;
2834         ops->var.yoffset = offset * vc->vc_font.height;
2835         ops->update_start(info);
2836
2837         if (!scrollback_current)
2838                 fbcon_cursor(vc, CM_DRAW);
2839         return 0;
2840 }
2841
2842 static int fbcon_set_origin(struct vc_data *vc)
2843 {
2844         if (softback_lines)
2845                 fbcon_scrolldelta(vc, softback_lines);
2846         return 0;
2847 }
2848
2849 static void fbcon_suspended(struct fb_info *info)
2850 {
2851         struct vc_data *vc = NULL;
2852         struct fbcon_ops *ops = info->fbcon_par;
2853
2854         if (!ops || ops->currcon < 0)
2855                 return;
2856         vc = vc_cons[ops->currcon].d;
2857
2858         /* Clear cursor, restore saved data */
2859         fbcon_cursor(vc, CM_ERASE);
2860 }
2861
2862 static void fbcon_resumed(struct fb_info *info)
2863 {
2864         struct vc_data *vc;
2865         struct fbcon_ops *ops = info->fbcon_par;
2866
2867         if (!ops || ops->currcon < 0)
2868                 return;
2869         vc = vc_cons[ops->currcon].d;
2870
2871         update_screen(vc);
2872 }
2873
2874 static void fbcon_modechanged(struct fb_info *info)
2875 {
2876         struct fbcon_ops *ops = info->fbcon_par;
2877         struct vc_data *vc;
2878         struct display *p;
2879         int rows, cols;
2880
2881         if (!ops || ops->currcon < 0)
2882                 return;
2883         vc = vc_cons[ops->currcon].d;
2884         if (vc->vc_mode != KD_TEXT ||
2885             registered_fb[con2fb_map[ops->currcon]] != info)
2886                 return;
2887
2888         p = &fb_display[vc->vc_num];
2889         set_blitting_type(vc, info);
2890
2891         if (CON_IS_VISIBLE(vc)) {
2892                 var_to_display(p, &info->var, info);
2893                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2894                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2895                 cols /= vc->vc_font.width;
2896                 rows /= vc->vc_font.height;
2897                 vc_resize(vc, cols, rows);
2898                 updatescrollmode(p, info, vc);
2899                 scrollback_max = 0;
2900                 scrollback_current = 0;
2901
2902                 if (!fbcon_is_inactive(vc, info)) {
2903                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2904                     ops->update_start(info);
2905                 }
2906
2907                 fbcon_set_palette(vc, color_table);
2908                 update_screen(vc);
2909                 if (softback_buf)
2910                         fbcon_update_softback(vc);
2911         }
2912 }
2913
2914 static void fbcon_set_all_vcs(struct fb_info *info)
2915 {
2916         struct fbcon_ops *ops = info->fbcon_par;
2917         struct vc_data *vc;
2918         struct display *p;
2919         int i, rows, cols, fg = -1;
2920
2921         if (!ops || ops->currcon < 0)
2922                 return;
2923
2924         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2925                 vc = vc_cons[i].d;
2926                 if (!vc || vc->vc_mode != KD_TEXT ||
2927                     registered_fb[con2fb_map[i]] != info)
2928                         continue;
2929
2930                 if (CON_IS_VISIBLE(vc)) {
2931                         fg = i;
2932                         continue;
2933                 }
2934
2935                 p = &fb_display[vc->vc_num];
2936                 set_blitting_type(vc, info);
2937                 var_to_display(p, &info->var, info);
2938                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2939                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2940                 cols /= vc->vc_font.width;
2941                 rows /= vc->vc_font.height;
2942                 vc_resize(vc, cols, rows);
2943         }
2944
2945         if (fg != -1)
2946                 fbcon_modechanged(info);
2947 }
2948
2949 static int fbcon_mode_deleted(struct fb_info *info,
2950                               struct fb_videomode *mode)
2951 {
2952         struct fb_info *fb_info;
2953         struct display *p;
2954         int i, j, found = 0;
2955
2956         /* before deletion, ensure that mode is not in use */
2957         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2958                 j = con2fb_map[i];
2959                 if (j == -1)
2960                         continue;
2961                 fb_info = registered_fb[j];
2962                 if (fb_info != info)
2963                         continue;
2964                 p = &fb_display[i];
2965                 if (!p || !p->mode)
2966                         continue;
2967                 if (fb_mode_is_equal(p->mode, mode)) {
2968                         found = 1;
2969                         break;
2970                 }
2971         }
2972         return found;
2973 }
2974
2975 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2976 static int fbcon_unbind(void)
2977 {
2978         int ret;
2979
2980         ret = unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
2981                                 fbcon_is_default);
2982
2983         if (!ret)
2984                 fbcon_has_console_bind = 0;
2985
2986         return ret;
2987 }
2988 #else
2989 static inline int fbcon_unbind(void)
2990 {
2991         return -EINVAL;
2992 }
2993 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
2994
2995 static int fbcon_fb_unbind(int idx)
2996 {
2997         int i, new_idx = -1, ret = 0;
2998
2999         if (!fbcon_has_console_bind)
3000                 return 0;
3001
3002         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3003                 if (con2fb_map[i] != idx &&
3004                     con2fb_map[i] != -1) {
3005                         new_idx = i;
3006                         break;
3007                 }
3008         }
3009
3010         if (new_idx != -1) {
3011                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3012                         if (con2fb_map[i] == idx)
3013                                 set_con2fb_map(i, new_idx, 0);
3014                 }
3015         } else
3016                 ret = fbcon_unbind();
3017
3018         return ret;
3019 }
3020
3021 static int fbcon_fb_unregistered(struct fb_info *info)
3022 {
3023         int i, idx;
3024
3025         idx = info->node;
3026         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3027                 if (con2fb_map[i] == idx)
3028                         con2fb_map[i] = -1;
3029         }
3030
3031         if (idx == info_idx) {
3032                 info_idx = -1;
3033
3034                 for (i = 0; i < FB_MAX; i++) {
3035                         if (registered_fb[i] != NULL) {
3036                                 info_idx = i;
3037                                 break;
3038                         }
3039                 }
3040         }
3041
3042         if (info_idx != -1) {
3043                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3044                         if (con2fb_map[i] == -1)
3045                                 con2fb_map[i] = info_idx;
3046                 }
3047         }
3048
3049         if (primary_device == idx)
3050                 primary_device = -1;
3051
3052         if (!num_registered_fb)
3053                 unregister_con_driver(&fb_con);
3054
3055         return 0;
3056 }
3057
3058 static void fbcon_remap_all(int idx)
3059 {
3060         int i;
3061         for (i = first_fb_vc; i <= last_fb_vc; i++)
3062                 set_con2fb_map(i, idx, 0);
3063
3064         if (con_is_bound(&fb_con)) {
3065                 printk(KERN_INFO "fbcon: Remapping primary device, "
3066                        "fb%i, to tty %i-%i\n", idx,
3067                        first_fb_vc + 1, last_fb_vc + 1);
3068                 info_idx = idx;
3069         }
3070 }
3071
3072 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
3073 static void fbcon_select_primary(struct fb_info *info)
3074 {
3075         if (!map_override && primary_device == -1 &&
3076             fb_is_primary_device(info)) {
3077                 int i;
3078
3079                 printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
3080                        info->fix.id, info->node);
3081                 primary_device = info->node;
3082
3083                 for (i = first_fb_vc; i <= last_fb_vc; i++)
3084                         con2fb_map_boot[i] = primary_device;
3085
3086                 if (con_is_bound(&fb_con)) {
3087                         printk(KERN_INFO "fbcon: Remapping primary device, "
3088                                "fb%i, to tty %i-%i\n", info->node,
3089                                first_fb_vc + 1, last_fb_vc + 1);
3090                         info_idx = primary_device;
3091                 }
3092         }
3093
3094 }
3095 #else
3096 static inline void fbcon_select_primary(struct fb_info *info)
3097 {
3098         return;
3099 }
3100 #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
3101
3102 static int fbcon_fb_registered(struct fb_info *info)
3103 {
3104         int ret = 0, i, idx;
3105
3106         idx = info->node;
3107         fbcon_select_primary(info);
3108
3109         if (info_idx == -1) {
3110                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3111                         if (con2fb_map_boot[i] == idx) {
3112                                 info_idx = idx;
3113                                 break;
3114                         }
3115                 }
3116
3117                 if (info_idx != -1)
3118                         ret = fbcon_takeover(1);
3119         } else {
3120                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3121                         if (con2fb_map_boot[i] == idx)
3122                                 set_con2fb_map(i, idx, 0);
3123                 }
3124         }
3125
3126         return ret;
3127 }
3128
3129 static void fbcon_fb_blanked(struct fb_info *info, int blank)
3130 {
3131         struct fbcon_ops *ops = info->fbcon_par;
3132         struct vc_data *vc;
3133
3134         if (!ops || ops->currcon < 0)
3135                 return;
3136
3137         vc = vc_cons[ops->currcon].d;
3138         if (vc->vc_mode != KD_TEXT ||
3139                         registered_fb[con2fb_map[ops->currcon]] != info)
3140                 return;
3141
3142         if (CON_IS_VISIBLE(vc)) {
3143                 if (blank)
3144                         do_blank_screen(0);
3145                 else
3146                         do_unblank_screen(0);
3147         }
3148         ops->blank_state = blank;
3149 }
3150
3151 static void fbcon_new_modelist(struct fb_info *info)
3152 {
3153         int i;
3154         struct vc_data *vc;
3155         struct fb_var_screeninfo var;
3156         const struct fb_videomode *mode;
3157
3158         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3159                 if (registered_fb[con2fb_map[i]] != info)
3160                         continue;
3161                 if (!fb_display[i].mode)
3162                         continue;
3163                 vc = vc_cons[i].d;
3164                 display_to_var(&var, &fb_display[i]);
3165                 mode = fb_find_nearest_mode(fb_display[i].mode,
3166                                             &info->modelist);
3167                 fb_videomode_to_var(&var, mode);
3168                 fbcon_set_disp(info, &var, vc->vc_num);
3169         }
3170 }
3171
3172 static void fbcon_get_requirement(struct fb_info *info,
3173                                   struct fb_blit_caps *caps)
3174 {
3175         struct vc_data *vc;
3176         struct display *p;
3177
3178         if (caps->flags) {
3179                 int i, charcnt;
3180
3181                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3182                         vc = vc_cons[i].d;
3183                         if (vc && vc->vc_mode == KD_TEXT &&
3184                             info->node == con2fb_map[i]) {
3185                                 p = &fb_display[i];
3186                                 caps->x |= 1 << (vc->vc_font.width - 1);
3187                                 caps->y |= 1 << (vc->vc_font.height - 1);
3188                                 charcnt = (p->userfont) ?
3189                                         FNTCHARCNT(p->fontdata) : 256;
3190                                 if (caps->len < charcnt)
3191                                         caps->len = charcnt;
3192                         }
3193                 }
3194         } else {
3195                 vc = vc_cons[fg_console].d;
3196
3197                 if (vc && vc->vc_mode == KD_TEXT &&
3198                     info->node == con2fb_map[fg_console]) {
3199                         p = &fb_display[fg_console];
3200                         caps->x = 1 << (vc->vc_font.width - 1);
3201                         caps->y = 1 << (vc->vc_font.height - 1);
3202                         caps->len = (p->userfont) ?
3203                                 FNTCHARCNT(p->fontdata) : 256;
3204                 }
3205         }
3206 }
3207
3208 static int fbcon_event_notify(struct notifier_block *self,
3209                               unsigned long action, void *data)
3210 {
3211         struct fb_event *event = data;
3212         struct fb_info *info = event->info;
3213         struct fb_videomode *mode;
3214         struct fb_con2fbmap *con2fb;
3215         struct fb_blit_caps *caps;
3216         int idx, ret = 0;
3217
3218         /*
3219          * ignore all events except driver registration and deregistration
3220          * if fbcon is not active
3221          */
3222         if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
3223                                   action == FB_EVENT_FB_UNREGISTERED))
3224                 goto done;
3225
3226         switch(action) {
3227         case FB_EVENT_SUSPEND:
3228                 fbcon_suspended(info);
3229                 break;
3230         case FB_EVENT_RESUME:
3231                 fbcon_resumed(info);
3232                 break;
3233         case FB_EVENT_MODE_CHANGE:
3234                 fbcon_modechanged(info);
3235                 break;
3236         case FB_EVENT_MODE_CHANGE_ALL:
3237                 fbcon_set_all_vcs(info);
3238                 break;
3239         case FB_EVENT_MODE_DELETE:
3240                 mode = event->data;
3241                 ret = fbcon_mode_deleted(info, mode);
3242                 break;
3243         case FB_EVENT_FB_UNBIND:
3244                 idx = info->node;
3245                 ret = fbcon_fb_unbind(idx);
3246                 break;
3247         case FB_EVENT_FB_REGISTERED:
3248                 ret = fbcon_fb_registered(info);
3249                 break;
3250         case FB_EVENT_FB_UNREGISTERED:
3251                 ret = fbcon_fb_unregistered(info);
3252                 break;
3253         case FB_EVENT_SET_CONSOLE_MAP:
3254                 con2fb = event->data;
3255                 ret = set_con2fb_map(con2fb->console - 1,
3256                                      con2fb->framebuffer, 1);
3257                 break;
3258         case FB_EVENT_GET_CONSOLE_MAP:
3259                 con2fb = event->data;
3260                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
3261                 break;
3262         case FB_EVENT_BLANK:
3263                 fbcon_fb_blanked(info, *(int *)event->data);
3264                 break;
3265         case FB_EVENT_NEW_MODELIST:
3266                 fbcon_new_modelist(info);
3267                 break;
3268         case FB_EVENT_GET_REQ:
3269                 caps = event->data;
3270                 fbcon_get_requirement(info, caps);
3271                 break;
3272         case FB_EVENT_REMAP_ALL_CONSOLE:
3273                 idx = info->node;
3274                 fbcon_remap_all(idx);
3275                 break;
3276         }
3277 done:
3278         return ret;
3279 }
3280
3281 /*
3282  *  The console `switch' structure for the frame buffer based console
3283  */
3284
3285 static const struct consw fb_con = {
3286         .owner                  = THIS_MODULE,
3287         .con_startup            = fbcon_startup,
3288         .con_init               = fbcon_init,
3289         .con_deinit             = fbcon_deinit,
3290         .con_clear              = fbcon_clear,
3291         .con_putc               = fbcon_putc,
3292         .con_putcs              = fbcon_putcs,
3293         .con_cursor             = fbcon_cursor,
3294         .con_scroll             = fbcon_scroll,
3295         .con_bmove              = fbcon_bmove,
3296         .con_switch             = fbcon_switch,
3297         .con_blank              = fbcon_blank,
3298         .con_font_set           = fbcon_set_font,
3299         .con_font_get           = fbcon_get_font,
3300         .con_font_default       = fbcon_set_def_font,
3301         .con_font_copy          = fbcon_copy_font,
3302         .con_set_palette        = fbcon_set_palette,
3303         .con_scrolldelta        = fbcon_scrolldelta,
3304         .con_set_origin         = fbcon_set_origin,
3305         .con_invert_region      = fbcon_invert_region,
3306         .con_screen_pos         = fbcon_screen_pos,
3307         .con_getxy              = fbcon_getxy,
3308         .con_resize             = fbcon_resize,
3309         .con_debug_enter        = fbcon_debug_enter,
3310         .con_debug_leave        = fbcon_debug_leave,
3311 };
3312
3313 static struct notifier_block fbcon_event_notifier = {
3314         .notifier_call  = fbcon_event_notify,
3315 };
3316
3317 static ssize_t store_rotate(struct device *device,
3318                             struct device_attribute *attr, const char *buf,
3319                             size_t count)
3320 {
3321         struct fb_info *info;
3322         int rotate, idx;
3323         char **last = NULL;
3324
3325         if (fbcon_has_exited)
3326                 return count;
3327
3328         console_lock();
3329         idx = con2fb_map[fg_console];
3330
3331         if (idx == -1 || registered_fb[idx] == NULL)
3332                 goto err;
3333
3334         info = registered_fb[idx];
3335         rotate = simple_strtoul(buf, last, 0);
3336         fbcon_rotate(info, rotate);
3337 err:
3338         console_unlock();
3339         return count;
3340 }
3341
3342 static ssize_t store_rotate_all(struct device *device,
3343                                 struct device_attribute *attr,const char *buf,
3344                                 size_t count)
3345 {
3346         struct fb_info *info;
3347         int rotate, idx;
3348         char **last = NULL;
3349
3350         if (fbcon_has_exited)
3351                 return count;
3352
3353         console_lock();
3354         idx = con2fb_map[fg_console];
3355
3356         if (idx == -1 || registered_fb[idx] == NULL)
3357                 goto err;
3358
3359         info = registered_fb[idx];
3360         rotate = simple_strtoul(buf, last, 0);
3361         fbcon_rotate_all(info, rotate);
3362 err:
3363         console_unlock();
3364         return count;
3365 }
3366
3367 static ssize_t show_rotate(struct device *device,
3368                            struct device_attribute *attr,char *buf)
3369 {
3370         struct fb_info *info;
3371         int rotate = 0, idx;
3372
3373         if (fbcon_has_exited)
3374                 return 0;
3375
3376         console_lock();
3377         idx = con2fb_map[fg_console];
3378
3379         if (idx == -1 || registered_fb[idx] == NULL)
3380                 goto err;
3381
3382         info = registered_fb[idx];
3383         rotate = fbcon_get_rotate(info);
3384 err:
3385         console_unlock();
3386         return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
3387 }
3388
3389 static ssize_t show_cursor_blink(struct device *device,
3390                                  struct device_attribute *attr, char *buf)
3391 {
3392         struct fb_info *info;
3393         struct fbcon_ops *ops;
3394         int idx, blink = -1;
3395
3396         if (fbcon_has_exited)
3397                 return 0;
3398
3399         console_lock();
3400         idx = con2fb_map[fg_console];
3401
3402         if (idx == -1 || registered_fb[idx] == NULL)
3403                 goto err;
3404
3405         info = registered_fb[idx];
3406         ops = info->fbcon_par;
3407
3408         if (!ops)
3409                 goto err;
3410
3411         blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0;
3412 err:
3413         console_unlock();
3414         return snprintf(buf, PAGE_SIZE, "%d\n", blink);
3415 }
3416
3417 static ssize_t store_cursor_blink(struct device *device,
3418                                   struct device_attribute *attr,
3419                                   const char *buf, size_t count)
3420 {
3421         struct fb_info *info;
3422         int blink, idx;
3423         char **last = NULL;
3424
3425         if (fbcon_has_exited)
3426                 return count;
3427
3428         console_lock();
3429         idx = con2fb_map[fg_console];
3430
3431         if (idx == -1 || registered_fb[idx] == NULL)
3432                 goto err;
3433
3434         info = registered_fb[idx];
3435
3436         if (!info->fbcon_par)
3437                 goto err;
3438
3439         blink = simple_strtoul(buf, last, 0);
3440
3441         if (blink) {
3442                 fbcon_cursor_noblink = 0;
3443                 fbcon_add_cursor_timer(info);
3444         } else {
3445                 fbcon_cursor_noblink = 1;
3446                 fbcon_del_cursor_timer(info);
3447         }
3448
3449 err:
3450         console_unlock();
3451         return count;
3452 }
3453
3454 static struct device_attribute device_attrs[] = {
3455         __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
3456         __ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
3457         __ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
3458                store_cursor_blink),
3459 };
3460
3461 static int fbcon_init_device(void)
3462 {
3463         int i, error = 0;
3464
3465         fbcon_has_sysfs = 1;
3466
3467         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3468                 error = device_create_file(fbcon_device, &device_attrs[i]);
3469
3470                 if (error)
3471                         break;
3472         }
3473
3474         if (error) {
3475                 while (--i >= 0)
3476                         device_remove_file(fbcon_device, &device_attrs[i]);
3477
3478                 fbcon_has_sysfs = 0;
3479         }
3480
3481         return 0;
3482 }
3483
3484 static void fbcon_start(void)
3485 {
3486         if (num_registered_fb) {
3487                 int i;
3488
3489                 console_lock();
3490
3491                 for (i = 0; i < FB_MAX; i++) {
3492                         if (registered_fb[i] != NULL) {
3493                                 info_idx = i;
3494                                 break;
3495                         }
3496                 }
3497
3498                 console_unlock();
3499                 fbcon_takeover(0);
3500         }
3501 }
3502
3503 static void fbcon_exit(void)
3504 {
3505         struct fb_info *info;
3506         int i, j, mapped;
3507
3508         if (fbcon_has_exited)
3509                 return;
3510
3511         kfree((void *)softback_buf);
3512         softback_buf = 0UL;
3513
3514         for (i = 0; i < FB_MAX; i++) {
3515                 int pending = 0;
3516
3517                 mapped = 0;
3518                 info = registered_fb[i];
3519
3520                 if (info == NULL)
3521                         continue;
3522
3523                 if (info->queue.func)
3524                         pending = cancel_work_sync(&info->queue);
3525                 DPRINTK("fbcon: %s pending work\n", (pending ? "canceled" :
3526                         "no"));
3527
3528                 for (j = first_fb_vc; j <= last_fb_vc; j++) {
3529                         if (con2fb_map[j] == i)
3530                                 mapped = 1;
3531                 }
3532
3533                 if (mapped) {
3534                         if (info->fbops->fb_release)
3535                                 info->fbops->fb_release(info, 0);
3536                         module_put(info->fbops->owner);
3537
3538                         if (info->fbcon_par) {
3539                                 struct fbcon_ops *ops = info->fbcon_par;
3540
3541                                 fbcon_del_cursor_timer(info);
3542                                 kfree(ops->cursor_src);
3543                                 kfree(info->fbcon_par);
3544                                 info->fbcon_par = NULL;
3545                         }
3546
3547                         if (info->queue.func == fb_flashcursor)
3548                                 info->queue.func = NULL;
3549                 }
3550         }
3551
3552         fbcon_has_exited = 1;
3553 }
3554
3555 static int __init fb_console_init(void)
3556 {
3557         int i;
3558
3559         console_lock();
3560         fb_register_client(&fbcon_event_notifier);
3561         fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
3562                                      "fbcon");
3563
3564         if (IS_ERR(fbcon_device)) {
3565                 printk(KERN_WARNING "Unable to create device "
3566                        "for fbcon; errno = %ld\n",
3567                        PTR_ERR(fbcon_device));
3568                 fbcon_device = NULL;
3569         } else
3570                 fbcon_init_device();
3571
3572         for (i = 0; i < MAX_NR_CONSOLES; i++)
3573                 con2fb_map[i] = -1;
3574
3575         console_unlock();
3576         fbcon_start();
3577         return 0;
3578 }
3579
3580 module_init(fb_console_init);
3581
3582 #ifdef MODULE
3583
3584 static void __exit fbcon_deinit_device(void)
3585 {
3586         int i;
3587
3588         if (fbcon_has_sysfs) {
3589                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3590                         device_remove_file(fbcon_device, &device_attrs[i]);
3591
3592                 fbcon_has_sysfs = 0;
3593         }
3594 }
3595
3596 static void __exit fb_console_exit(void)
3597 {
3598         console_lock();
3599         fb_unregister_client(&fbcon_event_notifier);
3600         fbcon_deinit_device();
3601         device_destroy(fb_class, MKDEV(0, 0));
3602         fbcon_exit();
3603         console_unlock();
3604         unregister_con_driver(&fb_con);
3605 }
3606
3607 module_exit(fb_console_exit);
3608
3609 #endif
3610
3611 MODULE_LICENSE("GPL");