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 #include <asm/system.h>
  81
  82 #include "fbcon.h"
  83
  84 #ifdef FBCONDEBUG
  85 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __func__ , ## args)
  86 #else
  87 #  define DPRINTK(fmt, args...)
  88 #endif
  89
  90 enum {
  91         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
  92         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
  93         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
  94 };
  95
  96 static struct display fb_display[MAX_NR_CONSOLES];
  97
  98 static signed char con2fb_map[MAX_NR_CONSOLES];
  99 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
 100
 101 static int logo_lines;
 102 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 103    enums.  */
 104 static int logo_shown = FBCON_LOGO_CANSHOW;
 105 /* Software scrollback */
 106 static int fbcon_softback_size = 32768;
 107 static unsigned long softback_buf, softback_curr;
 108 static unsigned long softback_in;
 109 static unsigned long softback_top, softback_end;
 110 static int softback_lines;
 111 /* console mappings */
 112 static int first_fb_vc;
 113 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 114 static int fbcon_is_default = 1;
 115 static int fbcon_has_exited;
 116 static int primary_device = -1;
 117 static int fbcon_has_console_bind;
 118
 119 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
 120 static int map_override;
 121
 122 static inline void fbcon_map_override(void)
 123 {
 124         map_override = 1;
 125 }
 126 #else
 127 static inline void fbcon_map_override(void)
 128 {
 129 }
 130 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */
 131
 132 /* font data */
 133 static char fontname[40];
 134
 135 /* current fb_info */
 136 static int info_idx = -1;
 137
 138 /* console rotation */
 139 static int initial_rotation;
 140 static int fbcon_has_sysfs;
 141
 142 static const struct consw fb_con;
 143
 144 #define CM_SOFTBACK     (8)
 145
 146 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 147
 148 static int fbcon_set_origin(struct vc_data *);
 149
 150 #define CURSOR_DRAW_DELAY               (1)
 151
 152 static int vbl_cursor_cnt;
 153 static int fbcon_cursor_noblink;
 154
 155 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 156
 157 /*
 158  *  Interface used by the world
 159  */
 160
 161 static const char *fbcon_startup(void);
 162 static void fbcon_init(struct vc_data *vc, int init);
 163 static void fbcon_deinit(struct vc_data *vc);
 164 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 165                         int width);
 166 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
 167 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 168                         int count, int ypos, int xpos);
 169 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 170 static void fbcon_cursor(struct vc_data *vc, int mode);
 171 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 172                         int count);
 173 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
 174                         int height, int width);
 175 static int fbcon_switch(struct vc_data *vc);
 176 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
 177 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
 178 static int fbcon_scrolldelta(struct vc_data *vc, int lines);
 179
 180 /*
 181  *  Internal routines
 182  */
 183 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 184 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 185 static __inline__ void ypan_up(struct vc_data *vc, int count);
 186 static __inline__ void ypan_down(struct vc_data *vc, int count);
 187 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
 188                             int dy, int dx, int height, int width, u_int y_break);
 189 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 190                            int unit);
 191 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 192                               int line, int count, int dy);
 193 static void fbcon_modechanged(struct fb_info *info);
 194 static void fbcon_set_all_vcs(struct fb_info *info);
 195 static void fbcon_start(void);
 196 static void fbcon_exit(void);
 197 static struct device *fbcon_device;
 198
 199 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 200 static inline void fbcon_set_rotation(struct fb_info *info)
 201 {
 202         struct fbcon_ops *ops = info->fbcon_par;
 203
 204         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
 205             ops->p->con_rotate < 4)
 206                 ops->rotate = ops->p->con_rotate;
 207         else
 208                 ops->rotate = 0;
 209 }
 210
 211 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 212 {
 213         struct fbcon_ops *ops= info->fbcon_par;
 214         struct fb_info *fb_info;
 215
 216         if (!ops || ops->currcon == -1)
 217                 return;
 218
 219         fb_info = registered_fb[con2fb_map[ops->currcon]];
 220
 221         if (info == fb_info) {
 222                 struct display *p = &fb_display[ops->currcon];
 223
 224                 if (rotate < 4)
 225                         p->con_rotate = rotate;
 226                 else
 227                         p->con_rotate = 0;
 228
 229                 fbcon_modechanged(info);
 230         }
 231 }
 232
 233 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 234 {
 235         struct fbcon_ops *ops = info->fbcon_par;
 236         struct vc_data *vc;
 237         struct display *p;
 238         int i;
 239
 240         if (!ops || ops->currcon < 0 || rotate > 3)
 241                 return;
 242
 243         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 244                 vc = vc_cons[i].d;
 245                 if (!vc || vc->vc_mode != KD_TEXT ||
 246                     registered_fb[con2fb_map[i]] != info)
 247                         continue;
 248
 249                 p = &fb_display[vc->vc_num];
 250                 p->con_rotate = rotate;
 251         }
 252
 253         fbcon_set_all_vcs(info);
 254 }
 255 #else
 256 static inline void fbcon_set_rotation(struct fb_info *info)
 257 {
 258         struct fbcon_ops *ops = info->fbcon_par;
 259
 260         ops->rotate = FB_ROTATE_UR;
 261 }
 262
 263 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 264 {
 265         return;
 266 }
 267
 268 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 269 {
 270         return;
 271 }
 272 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 273
 274 static int fbcon_get_rotate(struct fb_info *info)
 275 {
 276         struct fbcon_ops *ops = info->fbcon_par;
 277
 278         return (ops) ? ops->rotate : 0;
 279 }
 280
 281 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 282 {
 283         struct fbcon_ops *ops = info->fbcon_par;
 284
 285         return (info->state != FBINFO_STATE_RUNNING ||
 286                 vc->vc_mode != KD_TEXT || ops->graphics) &&
 287                 !vt_force_oops_output(vc);
 288 }
 289
 290 static int get_color(struct vc_data *vc, struct fb_info *info,
 291               u16 c, int is_fg)
 292 {
 293         int depth = fb_get_color_depth(&info->var, &info->fix);
 294         int color = 0;
 295
 296         if (console_blanked) {
 297                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 298
 299                 c = vc->vc_video_erase_char & charmask;
 300         }
 301
 302         if (depth != 1)
 303                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 304                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 305
 306         switch (depth) {
 307         case 1:
 308         {
 309                 int col = mono_col(info);
 310                 /* 0 or 1 */
 311                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 312                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 313
 314                 if (console_blanked)
 315                         fg = bg;
 316
 317                 color = (is_fg) ? fg : bg;
 318                 break;
 319         }
 320         case 2:
 321                 /*
 322                  * Scale down 16-colors to 4 colors. Default 4-color palette
 323                  * is grayscale. However, simply dividing the values by 4
 324                  * will not work, as colors 1, 2 and 3 will be scaled-down
 325                  * to zero rendering them invisible.  So empirically convert
 326                  * colors to a sane 4-level grayscale.
 327                  */
 328                 switch (color) {
 329                 case 0:
 330                         color = 0; /* black */
 331                         break;
 332                 case 1 ... 6:
 333                         color = 2; /* white */
 334                         break;
 335                 case 7 ... 8:
 336                         color = 1; /* gray */
 337                         break;
 338                 default:
 339                         color = 3; /* intense white */
 340                         break;
 341                 }
 342                 break;
 343         case 3:
 344                 /*
 345                  * Last 8 entries of default 16-color palette is a more intense
 346                  * version of the first 8 (i.e., same chrominance, different
 347                  * luminance).
 348                  */
 349                 color &= 7;
 350                 break;
 351         }
 352
 353
 354         return color;
 355 }
 356
 357 static void fbcon_update_softback(struct vc_data *vc)
 358 {
 359         int l = fbcon_softback_size / vc->vc_size_row;
 360
 361         if (l > 5)
 362                 softback_end = softback_buf + l * vc->vc_size_row;
 363         else
 364                 /* Smaller scrollback makes no sense, and 0 would screw
 365                    the operation totally */
 366                 softback_top = 0;
 367 }
 368
 369 static void fb_flashcursor(struct work_struct *work)
 370 {
 371         struct fb_info *info = container_of(work, struct fb_info, queue);
 372         struct fbcon_ops *ops = info->fbcon_par;
 373         struct vc_data *vc = NULL;
 374         int c;
 375         int mode;
 376
 377         console_lock();
 378         if (ops && ops->currcon != -1)
 379                 vc = vc_cons[ops->currcon].d;
 380
 381         if (!vc || !CON_IS_VISIBLE(vc) ||
 382             registered_fb[con2fb_map[vc->vc_num]] != info ||
 383             vc->vc_deccm != 1) {
 384                 console_unlock();
 385                 return;
 386         }
 387
 388         c = scr_readw((u16 *) vc->vc_pos);
 389         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 390                 CM_ERASE : CM_DRAW;
 391         ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
 392                     get_color(vc, info, c, 0));
 393         console_unlock();
 394 }
 395
 396 static void cursor_timer_handler(unsigned long dev_addr)
 397 {
 398         struct fb_info *info = (struct fb_info *) dev_addr;
 399         struct fbcon_ops *ops = info->fbcon_par;
 400
 401         schedule_work(&info->queue);
 402         mod_timer(&ops->cursor_timer, jiffies + HZ/5);
 403 }
 404
 405 static void fbcon_add_cursor_timer(struct fb_info *info)
 406 {
 407         struct fbcon_ops *ops = info->fbcon_par;
 408
 409         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
 410             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER) &&
 411             !fbcon_cursor_noblink) {
 412                 if (!info->queue.func)
 413                         INIT_WORK(&info->queue, fb_flashcursor);
 414
 415                 init_timer(&ops->cursor_timer);
 416                 ops->cursor_timer.function = cursor_timer_handler;
 417                 ops->cursor_timer.expires = jiffies + HZ / 5;
 418                 ops->cursor_timer.data = (unsigned long ) info;
 419                 add_timer(&ops->cursor_timer);
 420                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
 421         }
 422 }
 423
 424 static void fbcon_del_cursor_timer(struct fb_info *info)
 425 {
 426         struct fbcon_ops *ops = info->fbcon_par;
 427
 428         if (info->queue.func == fb_flashcursor &&
 429             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
 430                 del_timer_sync(&ops->cursor_timer);
 431                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
 432         }
 433 }
 434
 435 #ifndef MODULE
 436 static int __init fb_console_setup(char *this_opt)
 437 {
 438         char *options;
 439         int i, j;
 440
 441         if (!this_opt || !*this_opt)
 442                 return 1;
 443
 444         while ((options = strsep(&this_opt, ",")) != NULL) {
 445                 if (!strncmp(options, "font:", 5))
 446                         strcpy(fontname, options + 5);
 447
 448                 if (!strncmp(options, "scrollback:", 11)) {
 449                         options += 11;
 450                         if (*options) {
 451                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
 452                                 if (*options == 'k' || *options == 'K') {
 453                                         fbcon_softback_size *= 1024;
 454                                         options++;
 455                                 }
 456                                 if (*options != ',')
 457                                         return 1;
 458                                 options++;
 459                         } else
 460                                 return 1;
 461                 }
 462
 463                 if (!strncmp(options, "map:", 4)) {
 464                         options += 4;
 465                         if (*options) {
 466                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 467                                         if (!options[j])
 468                                                 j = 0;
 469                                         con2fb_map_boot[i] =
 470                                                 (options[j++]-'0') % FB_MAX;
 471                                 }
 472
 473                                 fbcon_map_override();
 474                         }
 475
 476                         return 1;
 477                 }
 478
 479                 if (!strncmp(options, "vc:", 3)) {
 480                         options += 3;
 481                         if (*options)
 482                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 483                         if (first_fb_vc < 0)
 484                                 first_fb_vc = 0;
 485                         if (*options++ == '-')
 486                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 487                         fbcon_is_default = 0;
 488                 }
 489
 490                 if (!strncmp(options, "rotate:", 7)) {
 491                         options += 7;
 492                         if (*options)
 493                                 initial_rotation = simple_strtoul(options, &options, 0);
 494                         if (initial_rotation > 3)
 495                                 initial_rotation = 0;
 496                 }
 497         }
 498         return 1;
 499 }
 500
 501 __setup("fbcon=", fb_console_setup);
 502 #endif
 503
 504 static int search_fb_in_map(int idx)
 505 {
 506         int i, retval = 0;
 507
 508         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 509                 if (con2fb_map[i] == idx)
 510                         retval = 1;
 511         }
 512         return retval;
 513 }
 514
 515 static int search_for_mapped_con(void)
 516 {
 517         int i, retval = 0;
 518
 519         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 520                 if (con2fb_map[i] != -1)
 521                         retval = 1;
 522         }
 523         return retval;
 524 }
 525
 526 static int fbcon_takeover(int show_logo)
 527 {
 528         int err, i;
 529
 530         if (!num_registered_fb)
 531                 return -ENODEV;
 532
 533         if (!show_logo)
 534                 logo_shown = FBCON_LOGO_DONTSHOW;
 535
 536         for (i = first_fb_vc; i <= last_fb_vc; i++)
 537                 con2fb_map[i] = info_idx;
 538
 539         err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 540                                 fbcon_is_default);
 541
 542         if (err) {
 543                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
 544                         con2fb_map[i] = -1;
 545                 }
 546                 info_idx = -1;
 547         } else {
 548                 fbcon_has_console_bind = 1;
 549         }
 550
 551         return err;
 552 }
 553
 554 #ifdef MODULE
 555 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 556                                int cols, int rows, int new_cols, int new_rows)
 557 {
 558         logo_shown = FBCON_LOGO_DONTSHOW;
 559 }
 560 #else
 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         /* Need to make room for the logo */
 565         struct fbcon_ops *ops = info->fbcon_par;
 566         int cnt, erase = vc->vc_video_erase_char, step;
 567         unsigned short *save = NULL, *r, *q;
 568         int logo_height;
 569
 570         if (info->flags & FBINFO_MODULE) {
 571                 logo_shown = FBCON_LOGO_DONTSHOW;
 572                 return;
 573         }
 574
 575         /*
 576          * remove underline attribute from erase character
 577          * if black and white framebuffer.
 578          */
 579         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 580                 erase &= ~0x400;
 581         logo_height = fb_prepare_logo(info, ops->rotate);
 582         logo_lines = DIV_ROUND_UP(logo_height, vc->vc_font.height);
 583         q = (unsigned short *) (vc->vc_origin +
 584                                 vc->vc_size_row * rows);
 585         step = logo_lines * cols;
 586         for (r = q - logo_lines * cols; r < q; r++)
 587                 if (scr_readw(r) != vc->vc_video_erase_char)
 588                         break;
 589         if (r != q && new_rows >= rows + logo_lines) {
 590                 save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
 591                 if (save) {
 592                         int i = cols < new_cols ? cols : new_cols;
 593                         scr_memsetw(save, erase, logo_lines * new_cols * 2);
 594                         r = q - step;
 595                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 596                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 597                         r = q;
 598                 }
 599         }
 600         if (r == q) {
 601                 /* We can scroll screen down */
 602                 r = q - step - cols;
 603                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 604                         scr_memcpyw(r + step, r, vc->vc_size_row);
 605                         r -= cols;
 606                 }
 607                 if (!save) {
 608                         int lines;
 609                         if (vc->vc_y + logo_lines >= rows)
 610                                 lines = rows - vc->vc_y - 1;
 611                         else
 612                                 lines = logo_lines;
 613                         vc->vc_y += lines;
 614                         vc->vc_pos += lines * vc->vc_size_row;
 615                 }
 616         }
 617         scr_memsetw((unsigned short *) vc->vc_origin,
 618                     erase,
 619                     vc->vc_size_row * logo_lines);
 620
 621         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
 622                 fbcon_clear_margins(vc, 0);
 623                 update_screen(vc);
 624         }
 625
 626         if (save) {
 627                 q = (unsigned short *) (vc->vc_origin +
 628                                         vc->vc_size_row *
 629                                         rows);
 630                 scr_memcpyw(q, save, logo_lines * new_cols * 2);
 631                 vc->vc_y += logo_lines;
 632                 vc->vc_pos += logo_lines * vc->vc_size_row;
 633                 kfree(save);
 634         }
 635
 636         if (logo_lines > vc->vc_bottom) {
 637                 logo_shown = FBCON_LOGO_CANSHOW;
 638                 printk(KERN_INFO
 639                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
 640         } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
 641                 logo_shown = FBCON_LOGO_DRAW;
 642                 vc->vc_top = logo_lines;
 643         }
 644 }
 645 #endif /* MODULE */
 646
 647 #ifdef CONFIG_FB_TILEBLITTING
 648 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 649 {
 650         struct fbcon_ops *ops = info->fbcon_par;
 651
 652         ops->p = &fb_display[vc->vc_num];
 653
 654         if ((info->flags & FBINFO_MISC_TILEBLITTING))
 655                 fbcon_set_tileops(vc, info);
 656         else {
 657                 fbcon_set_rotation(info);
 658                 fbcon_set_bitops(ops);
 659         }
 660 }
 661
 662 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 663 {
 664         int err = 0;
 665
 666         if (info->flags & FBINFO_MISC_TILEBLITTING &&
 667             info->tileops->fb_get_tilemax(info) < charcount)
 668                 err = 1;
 669
 670         return err;
 671 }
 672 #else
 673 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 674 {
 675         struct fbcon_ops *ops = info->fbcon_par;
 676
 677         info->flags &= ~FBINFO_MISC_TILEBLITTING;
 678         ops->p = &fb_display[vc->vc_num];
 679         fbcon_set_rotation(info);
 680         fbcon_set_bitops(ops);
 681 }
 682
 683 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 684 {
 685         return 0;
 686 }
 687
 688 #endif /* CONFIG_MISC_TILEBLITTING */
 689
 690
 691 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
 692                                   int unit, int oldidx)
 693 {
 694         struct fbcon_ops *ops = NULL;
 695         int err = 0;
 696
 697         if (!try_module_get(info->fbops->owner))
 698                 err = -ENODEV;
 699
 700         if (!err && info->fbops->fb_open &&
 701             info->fbops->fb_open(info, 0))
 702                 err = -ENODEV;
 703
 704         if (!err) {
 705                 ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 706                 if (!ops)
 707                         err = -ENOMEM;
 708         }
 709
 710         if (!err) {
 711                 info->fbcon_par = ops;
 712
 713                 if (vc)
 714                         set_blitting_type(vc, info);
 715         }
 716
 717         if (err) {
 718                 con2fb_map[unit] = oldidx;
 719                 module_put(info->fbops->owner);
 720         }
 721
 722         return err;
 723 }
 724
 725 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 726                                   struct fb_info *newinfo, int unit,
 727                                   int oldidx, int found)
 728 {
 729         struct fbcon_ops *ops = oldinfo->fbcon_par;
 730         int err = 0, ret;
 731
 732         if (oldinfo->fbops->fb_release &&
 733             oldinfo->fbops->fb_release(oldinfo, 0)) {
 734                 con2fb_map[unit] = oldidx;
 735                 if (!found && newinfo->fbops->fb_release)
 736                         newinfo->fbops->fb_release(newinfo, 0);
 737                 if (!found)
 738                         module_put(newinfo->fbops->owner);
 739                 err = -ENODEV;
 740         }
 741
 742         if (!err) {
 743                 fbcon_del_cursor_timer(oldinfo);
 744                 kfree(ops->cursor_state.mask);
 745                 kfree(ops->cursor_data);
 746                 kfree(ops->fontbuffer);
 747                 kfree(oldinfo->fbcon_par);
 748                 oldinfo->fbcon_par = NULL;
 749                 module_put(oldinfo->fbops->owner);
 750                 /*
 751                   If oldinfo and newinfo are driving the same hardware,
 752                   the fb_release() method of oldinfo may attempt to
 753                   restore the hardware state.  This will leave the
 754                   newinfo in an undefined state. Thus, a call to
 755                   fb_set_par() may be needed for the newinfo.
 756                 */
 757                 if (newinfo->fbops->fb_set_par) {
 758                         ret = newinfo->fbops->fb_set_par(newinfo);
 759
 760                         if (ret)
 761                                 printk(KERN_ERR "con2fb_release_oldinfo: "
 762                                         "detected unhandled fb_set_par error, "
 763                                         "error code %d\n", ret);
 764                 }
 765         }
 766
 767         return err;
 768 }
 769
 770 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 771                                 int unit, int show_logo)
 772 {
 773         struct fbcon_ops *ops = info->fbcon_par;
 774         int ret;
 775
 776         ops->currcon = fg_console;
 777
 778         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT)) {
 779                 ret = info->fbops->fb_set_par(info);
 780
 781                 if (ret)
 782                         printk(KERN_ERR "con2fb_init_display: detected "
 783                                 "unhandled fb_set_par error, "
 784                                 "error code %d\n", ret);
 785         }
 786
 787         ops->flags |= FBCON_FLAGS_INIT;
 788         ops->graphics = 0;
 789         fbcon_set_disp(info, &info->var, unit);
 790
 791         if (show_logo) {
 792                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 793                 struct fb_info *fg_info =
 794                         registered_fb[con2fb_map[fg_console]];
 795
 796                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 797                                    fg_vc->vc_rows, fg_vc->vc_cols,
 798                                    fg_vc->vc_rows);
 799         }
 800
 801         update_screen(vc_cons[fg_console].d);
 802 }
 803
 804 /**
 805  *      set_con2fb_map - map console to frame buffer device
 806  *      @unit: virtual console number to map
 807  *      @newidx: frame buffer index to map virtual console to
 808  *      @user: user request
 809  *
 810  *      Maps a virtual console @unit to a frame buffer device
 811  *      @newidx.
 812  */
 813 static int set_con2fb_map(int unit, int newidx, int user)
 814 {
 815         struct vc_data *vc = vc_cons[unit].d;
 816         int oldidx = con2fb_map[unit];
 817         struct fb_info *info = registered_fb[newidx];
 818         struct fb_info *oldinfo = NULL;
 819         int found, err = 0;
 820
 821         if (oldidx == newidx)
 822                 return 0;
 823
 824         if (!info)
 825                 return -EINVAL;
 826
 827         if (!search_for_mapped_con() || !con_is_bound(&fb_con)) {
 828                 info_idx = newidx;
 829                 return fbcon_takeover(0);
 830         }
 831
 832         if (oldidx != -1)
 833                 oldinfo = registered_fb[oldidx];
 834
 835         found = search_fb_in_map(newidx);
 836
 837         console_lock();
 838         con2fb_map[unit] = newidx;
 839         if (!err && !found)
 840                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 841
 842
 843         /*
 844          * If old fb is not mapped to any of the consoles,
 845          * fbcon should release it.
 846          */
 847         if (!err && oldinfo && !search_fb_in_map(oldidx))
 848                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 849                                              found);
 850
 851         if (!err) {
 852                 int show_logo = (fg_console == 0 && !user &&
 853                                  logo_shown != FBCON_LOGO_DONTSHOW);
 854
 855                 if (!found)
 856                         fbcon_add_cursor_timer(info);
 857                 con2fb_map_boot[unit] = newidx;
 858                 con2fb_init_display(vc, info, unit, show_logo);
 859         }
 860
 861         if (!search_fb_in_map(info_idx))
 862                 info_idx = newidx;
 863
 864         console_unlock();
 865         return err;
 866 }
 867
 868 /*
 869  *  Low Level Operations
 870  */
 871 /* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
 872 static int var_to_display(struct display *disp,
 873                           struct fb_var_screeninfo *var,
 874                           struct fb_info *info)
 875 {
 876         disp->xres_virtual = var->xres_virtual;
 877         disp->yres_virtual = var->yres_virtual;
 878         disp->bits_per_pixel = var->bits_per_pixel;
 879         disp->grayscale = var->grayscale;
 880         disp->nonstd = var->nonstd;
 881         disp->accel_flags = var->accel_flags;
 882         disp->height = var->height;
 883         disp->width = var->width;
 884         disp->red = var->red;
 885         disp->green = var->green;
 886         disp->blue = var->blue;
 887         disp->transp = var->transp;
 888         disp->rotate = var->rotate;
 889         disp->mode = fb_match_mode(var, &info->modelist);
 890         if (disp->mode == NULL)
 891                 /* This should not happen */
 892                 return -EINVAL;
 893         return 0;
 894 }
 895
 896 static void display_to_var(struct fb_var_screeninfo *var,
 897                            struct display *disp)
 898 {
 899         fb_videomode_to_var(var, disp->mode);
 900         var->xres_virtual = disp->xres_virtual;
 901         var->yres_virtual = disp->yres_virtual;
 902         var->bits_per_pixel = disp->bits_per_pixel;
 903         var->grayscale = disp->grayscale;
 904         var->nonstd = disp->nonstd;
 905         var->accel_flags = disp->accel_flags;
 906         var->height = disp->height;
 907         var->width = disp->width;
 908         var->red = disp->red;
 909         var->green = disp->green;
 910         var->blue = disp->blue;
 911         var->transp = disp->transp;
 912         var->rotate = disp->rotate;
 913 }
 914
 915 static const char *fbcon_startup(void)
 916 {
 917         const char *display_desc = "frame buffer device";
 918         struct display *p = &fb_display[fg_console];
 919         struct vc_data *vc = vc_cons[fg_console].d;
 920         const struct font_desc *font = NULL;
 921         struct module *owner;
 922         struct fb_info *info = NULL;
 923         struct fbcon_ops *ops;
 924         int rows, cols;
 925
 926         /*
 927          *  If num_registered_fb is zero, this is a call for the dummy part.
 928          *  The frame buffer devices weren't initialized yet.
 929          */
 930         if (!num_registered_fb || info_idx == -1)
 931                 return display_desc;
 932         /*
 933          * Instead of blindly using registered_fb[0], we use info_idx, set by
 934          * fb_console_init();
 935          */
 936         info = registered_fb[info_idx];
 937         if (!info)
 938                 return NULL;
 939
 940         owner = info->fbops->owner;
 941         if (!try_module_get(owner))
 942                 return NULL;
 943         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 944                 module_put(owner);
 945                 return NULL;
 946         }
 947
 948         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 949         if (!ops) {
 950                 module_put(owner);
 951                 return NULL;
 952         }
 953
 954         ops->currcon = -1;
 955         ops->graphics = 1;
 956         ops->cur_rotate = -1;
 957         info->fbcon_par = ops;
 958         p->con_rotate = initial_rotation;
 959         set_blitting_type(vc, info);
 960
 961         if (info->fix.type != FB_TYPE_TEXT) {
 962                 if (fbcon_softback_size) {
 963                         if (!softback_buf) {
 964                                 softback_buf =
 965                                     (unsigned long)
 966                                     kmalloc(fbcon_softback_size,
 967                                             GFP_KERNEL);
 968                                 if (!softback_buf) {
 969                                         fbcon_softback_size = 0;
 970                                         softback_top = 0;
 971                                 }
 972                         }
 973                 } else {
 974                         if (softback_buf) {
 975                                 kfree((void *) softback_buf);
 976                                 softback_buf = 0;
 977                                 softback_top = 0;
 978                         }
 979                 }
 980                 if (softback_buf)
 981                         softback_in = softback_top = softback_curr =
 982                             softback_buf;
 983                 softback_lines = 0;
 984         }
 985
 986         /* Setup default font */
 987         if (!p->fontdata) {
 988                 if (!fontname[0] || !(font = find_font(fontname)))
 989                         font = get_default_font(info->var.xres,
 990                                                 info->var.yres,
 991                                                 info->pixmap.blit_x,
 992                                                 info->pixmap.blit_y);
 993                 vc->vc_font.width = font->width;
 994                 vc->vc_font.height = font->height;
 995                 vc->vc_font.data = (void *)(p->fontdata = font->data);
 996                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
 997         }
 998
 999         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1000         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1001         cols /= vc->vc_font.width;
1002         rows /= vc->vc_font.height;
1003         vc_resize(vc, cols, rows);
1004
1005         DPRINTK("mode:   %s\n", info->fix.id);
1006         DPRINTK("visual: %d\n", info->fix.visual);
1007         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
1008                 info->var.yres,
1009                 info->var.bits_per_pixel);
1010
1011         fbcon_add_cursor_timer(info);
1012         fbcon_has_exited = 0;
1013         return display_desc;
1014 }
1015
1016 static void fbcon_init(struct vc_data *vc, int init)
1017 {
1018         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1019         struct fbcon_ops *ops;
1020         struct vc_data **default_mode = vc->vc_display_fg;
1021         struct vc_data *svc = *default_mode;
1022         struct display *t, *p = &fb_display[vc->vc_num];
1023         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1024         int cap, ret;
1025
1026         if (info_idx == -1 || info == NULL)
1027             return;
1028
1029         cap = info->flags;
1030
1031         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1032             (info->fix.type == FB_TYPE_TEXT))
1033                 logo = 0;
1034
1035         if (var_to_display(p, &info->var, info))
1036                 return;
1037
1038         if (!info->fbcon_par)
1039                 con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);
1040
1041         /* If we are not the first console on this
1042            fb, copy the font from that console */
1043         t = &fb_display[fg_console];
1044         if (!p->fontdata) {
1045                 if (t->fontdata) {
1046                         struct vc_data *fvc = vc_cons[fg_console].d;
1047
1048                         vc->vc_font.data = (void *)(p->fontdata =
1049                                                     fvc->vc_font.data);
1050                         vc->vc_font.width = fvc->vc_font.width;
1051                         vc->vc_font.height = fvc->vc_font.height;
1052                         p->userfont = t->userfont;
1053
1054                         if (p->userfont)
1055                                 REFCOUNT(p->fontdata)++;
1056                 } else {
1057                         const struct font_desc *font = NULL;
1058
1059                         if (!fontname[0] || !(font = find_font(fontname)))
1060                                 font = get_default_font(info->var.xres,
1061                                                         info->var.yres,
1062                                                         info->pixmap.blit_x,
1063                                                         info->pixmap.blit_y);
1064                         vc->vc_font.width = font->width;
1065                         vc->vc_font.height = font->height;
1066                         vc->vc_font.data = (void *)(p->fontdata = font->data);
1067                         vc->vc_font.charcount = 256; /* FIXME  Need to
1068                                                         support more fonts */
1069                 }
1070         }
1071
1072         if (p->userfont)
1073                 charcnt = FNTCHARCNT(p->fontdata);
1074
1075         vc->vc_panic_force_write = !!(info->flags & FBINFO_CAN_FORCE_OUTPUT);
1076         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1077         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1078         if (charcnt == 256) {
1079                 vc->vc_hi_font_mask = 0;
1080         } else {
1081                 vc->vc_hi_font_mask = 0x100;
1082                 if (vc->vc_can_do_color)
1083                         vc->vc_complement_mask <<= 1;
1084         }
1085
1086         if (!*svc->vc_uni_pagedir_loc)
1087                 con_set_default_unimap(svc);
1088         if (!*vc->vc_uni_pagedir_loc)
1089                 con_copy_unimap(vc, svc);
1090
1091         ops = info->fbcon_par;
1092         p->con_rotate = initial_rotation;
1093         set_blitting_type(vc, info);
1094
1095         cols = vc->vc_cols;
1096         rows = vc->vc_rows;
1097         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1098         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1099         new_cols /= vc->vc_font.width;
1100         new_rows /= vc->vc_font.height;
1101
1102         /*
1103          * We must always set the mode. The mode of the previous console
1104          * driver could be in the same resolution but we are using different
1105          * hardware so we have to initialize the hardware.
1106          *
1107          * We need to do it in fbcon_init() to prevent screen corruption.
1108          */
1109         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
1110                 if (info->fbops->fb_set_par &&
1111                     !(ops->flags & FBCON_FLAGS_INIT)) {
1112                         ret = info->fbops->fb_set_par(info);
1113
1114                         if (ret)
1115                                 printk(KERN_ERR "fbcon_init: detected "
1116                                         "unhandled fb_set_par error, "
1117                                         "error code %d\n", ret);
1118                 }
1119
1120                 ops->flags |= FBCON_FLAGS_INIT;
1121         }
1122
1123         ops->graphics = 0;
1124
1125         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1126             !(cap & FBINFO_HWACCEL_DISABLED))
1127                 p->scrollmode = SCROLL_MOVE;
1128         else /* default to something safe */
1129                 p->scrollmode = SCROLL_REDRAW;
1130
1131         /*
1132          *  ++guenther: console.c:vc_allocate() relies on initializing
1133          *  vc_{cols,rows}, but we must not set those if we are only
1134          *  resizing the console.
1135          */
1136         if (init) {
1137                 vc->vc_cols = new_cols;
1138                 vc->vc_rows = new_rows;
1139         } else
1140                 vc_resize(vc, new_cols, new_rows);
1141
1142         if (logo)
1143                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1144
1145         if (vc == svc && softback_buf)
1146                 fbcon_update_softback(vc);
1147
1148         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1149                 ops->rotate = FB_ROTATE_UR;
1150                 set_blitting_type(vc, info);
1151         }
1152
1153         ops->p = &fb_display[fg_console];
1154 }
1155
1156 static void fbcon_free_font(struct display *p)
1157 {
1158         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
1159                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
1160         p->fontdata = NULL;
1161         p->userfont = 0;
1162 }
1163
1164 static void fbcon_deinit(struct vc_data *vc)
1165 {
1166         struct display *p = &fb_display[vc->vc_num];
1167         struct fb_info *info;
1168         struct fbcon_ops *ops;
1169         int idx;
1170
1171         fbcon_free_font(p);
1172         idx = con2fb_map[vc->vc_num];
1173
1174         if (idx == -1)
1175                 goto finished;
1176
1177         info = registered_fb[idx];
1178
1179         if (!info)
1180                 goto finished;
1181
1182         ops = info->fbcon_par;
1183
1184         if (!ops)
1185                 goto finished;
1186
1187         if (CON_IS_VISIBLE(vc))
1188                 fbcon_del_cursor_timer(info);
1189
1190         ops->flags &= ~FBCON_FLAGS_INIT;
1191 finished:
1192
1193         if (!con_is_bound(&fb_con))
1194                 fbcon_exit();
1195
1196         return;
1197 }
1198
1199 /* ====================================================================== */
1200
1201 /*  fbcon_XXX routines - interface used by the world
1202  *
1203  *  This system is now divided into two levels because of complications
1204  *  caused by hardware scrolling. Top level functions:
1205  *
1206  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1207  *
1208  *  handles y values in range [0, scr_height-1] that correspond to real
1209  *  screen positions. y_wrap shift means that first line of bitmap may be
1210  *  anywhere on this display. These functions convert lineoffsets to
1211  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1212  *
1213  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1214  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1215  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1216  *
1217  *  WARNING:
1218  *
1219  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1220  *  Implies should only really hardware scroll in rows. Only reason for
1221  *  restriction is simplicity & efficiency at the moment.
1222  */
1223
1224 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1225                         int width)
1226 {
1227         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1228         struct fbcon_ops *ops = info->fbcon_par;
1229
1230         struct display *p = &fb_display[vc->vc_num];
1231         u_int y_break;
1232
1233         if (fbcon_is_inactive(vc, info))
1234                 return;
1235
1236         if (!height || !width)
1237                 return;
1238
1239         if (sy < vc->vc_top && vc->vc_top == logo_lines)
1240                 vc->vc_top = 0;
1241
1242         /* Split blits that cross physical y_wrap boundary */
1243
1244         y_break = p->vrows - p->yscroll;
1245         if (sy < y_break && sy + height - 1 >= y_break) {
1246                 u_int b = y_break - sy;
1247                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1248                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1249                                  width);
1250         } else
1251                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1252 }
1253
1254 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1255                         int count, int ypos, int xpos)
1256 {
1257         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1258         struct display *p = &fb_display[vc->vc_num];
1259         struct fbcon_ops *ops = info->fbcon_par;
1260
1261         if (!fbcon_is_inactive(vc, info))
1262                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1263                            get_color(vc, info, scr_readw(s), 1),
1264                            get_color(vc, info, scr_readw(s), 0));
1265 }
1266
1267 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1268 {
1269         unsigned short chr;
1270
1271         scr_writew(c, &chr);
1272         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1273 }
1274
1275 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1276 {
1277         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1278         struct fbcon_ops *ops = info->fbcon_par;
1279
1280         if (!fbcon_is_inactive(vc, info))
1281                 ops->clear_margins(vc, info, bottom_only);
1282 }
1283
1284 static void fbcon_cursor(struct vc_data *vc, int mode)
1285 {
1286         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1287         struct fbcon_ops *ops = info->fbcon_par;
1288         int y;
1289         int c = scr_readw((u16 *) vc->vc_pos);
1290
1291         if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
1292                 return;
1293
1294         if (vc->vc_cursor_type & 0x10)
1295                 fbcon_del_cursor_timer(info);
1296         else
1297                 fbcon_add_cursor_timer(info);
1298
1299         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1300         if (mode & CM_SOFTBACK) {
1301                 mode &= ~CM_SOFTBACK;
1302                 y = softback_lines;
1303         } else {
1304                 if (softback_lines)
1305                         fbcon_set_origin(vc);
1306                 y = 0;
1307         }
1308
1309         ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
1310                     get_color(vc, info, c, 0));
1311         vbl_cursor_cnt = CURSOR_DRAW_DELAY;
1312 }
1313
1314 static int scrollback_phys_max = 0;
1315 static int scrollback_max = 0;
1316 static int scrollback_current = 0;
1317
1318 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1319                            int unit)
1320 {
1321         struct display *p, *t;
1322         struct vc_data **default_mode, *vc;
1323         struct vc_data *svc;
1324         struct fbcon_ops *ops = info->fbcon_par;
1325         int rows, cols, charcnt = 256;
1326
1327         p = &fb_display[unit];
1328
1329         if (var_to_display(p, var, info))
1330                 return;
1331
1332         vc = vc_cons[unit].d;
1333
1334         if (!vc)
1335                 return;
1336
1337         default_mode = vc->vc_display_fg;
1338         svc = *default_mode;
1339         t = &fb_display[svc->vc_num];
1340
1341         if (!vc->vc_font.data) {
1342                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1343                 vc->vc_font.width = (*default_mode)->vc_font.width;
1344                 vc->vc_font.height = (*default_mode)->vc_font.height;
1345                 p->userfont = t->userfont;
1346                 if (p->userfont)
1347                         REFCOUNT(p->fontdata)++;
1348         }
1349         if (p->userfont)
1350                 charcnt = FNTCHARCNT(p->fontdata);
1351
1352         var->activate = FB_ACTIVATE_NOW;
1353         info->var.activate = var->activate;
1354         var->yoffset = info->var.yoffset;
1355         var->xoffset = info->var.xoffset;
1356         fb_set_var(info, var);
1357         ops->var = info->var;
1358         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1359         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1360         if (charcnt == 256) {
1361                 vc->vc_hi_font_mask = 0;
1362         } else {
1363                 vc->vc_hi_font_mask = 0x100;
1364                 if (vc->vc_can_do_color)
1365                         vc->vc_complement_mask <<= 1;
1366         }
1367
1368         if (!*svc->vc_uni_pagedir_loc)
1369                 con_set_default_unimap(svc);
1370         if (!*vc->vc_uni_pagedir_loc)
1371                 con_copy_unimap(vc, svc);
1372
1373         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1374         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1375         cols /= vc->vc_font.width;
1376         rows /= vc->vc_font.height;
1377         vc_resize(vc, cols, rows);
1378
1379         if (CON_IS_VISIBLE(vc)) {
1380                 update_screen(vc);
1381                 if (softback_buf)
1382                         fbcon_update_softback(vc);
1383         }
1384 }
1385
1386 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1387 {
1388         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1389         struct fbcon_ops *ops = info->fbcon_par;
1390         struct display *p = &fb_display[vc->vc_num];
1391
1392         p->yscroll += count;
1393         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1394                 p->yscroll -= p->vrows;
1395         ops->var.xoffset = 0;
1396         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1397         ops->var.vmode |= FB_VMODE_YWRAP;
1398         ops->update_start(info);
1399         scrollback_max += count;
1400         if (scrollback_max > scrollback_phys_max)
1401                 scrollback_max = scrollback_phys_max;
1402         scrollback_current = 0;
1403 }
1404
1405 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1406 {
1407         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1408         struct fbcon_ops *ops = info->fbcon_par;
1409         struct display *p = &fb_display[vc->vc_num];
1410
1411         p->yscroll -= count;
1412         if (p->yscroll < 0)     /* Deal with wrap */
1413                 p->yscroll += p->vrows;
1414         ops->var.xoffset = 0;
1415         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1416         ops->var.vmode |= FB_VMODE_YWRAP;
1417         ops->update_start(info);
1418         scrollback_max -= count;
1419         if (scrollback_max < 0)
1420                 scrollback_max = 0;
1421         scrollback_current = 0;
1422 }
1423
1424 static __inline__ void ypan_up(struct vc_data *vc, int count)
1425 {
1426         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1427         struct display *p = &fb_display[vc->vc_num];
1428         struct fbcon_ops *ops = info->fbcon_par;
1429
1430         p->yscroll += count;
1431         if (p->yscroll > p->vrows - vc->vc_rows) {
1432                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1433                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1434                 p->yscroll -= p->vrows - vc->vc_rows;
1435         }
1436
1437         ops->var.xoffset = 0;
1438         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1439         ops->var.vmode &= ~FB_VMODE_YWRAP;
1440         ops->update_start(info);
1441         fbcon_clear_margins(vc, 1);
1442         scrollback_max += count;
1443         if (scrollback_max > scrollback_phys_max)
1444                 scrollback_max = scrollback_phys_max;
1445         scrollback_current = 0;
1446 }
1447
1448 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1449 {
1450         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1451         struct fbcon_ops *ops = info->fbcon_par;
1452         struct display *p = &fb_display[vc->vc_num];
1453
1454         p->yscroll += count;
1455
1456         if (p->yscroll > p->vrows - vc->vc_rows) {
1457                 p->yscroll -= p->vrows - vc->vc_rows;
1458                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1459         }
1460
1461         ops->var.xoffset = 0;
1462         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1463         ops->var.vmode &= ~FB_VMODE_YWRAP;
1464         ops->update_start(info);
1465         fbcon_clear_margins(vc, 1);
1466         scrollback_max += count;
1467         if (scrollback_max > scrollback_phys_max)
1468                 scrollback_max = scrollback_phys_max;
1469         scrollback_current = 0;
1470 }
1471
1472 static __inline__ void ypan_down(struct vc_data *vc, int count)
1473 {
1474         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1475         struct display *p = &fb_display[vc->vc_num];
1476         struct fbcon_ops *ops = info->fbcon_par;
1477
1478         p->yscroll -= count;
1479         if (p->yscroll < 0) {
1480                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1481                             0, vc->vc_rows, vc->vc_cols);
1482                 p->yscroll += p->vrows - vc->vc_rows;
1483         }
1484
1485         ops->var.xoffset = 0;
1486         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1487         ops->var.vmode &= ~FB_VMODE_YWRAP;
1488         ops->update_start(info);
1489         fbcon_clear_margins(vc, 1);
1490         scrollback_max -= count;
1491         if (scrollback_max < 0)
1492                 scrollback_max = 0;
1493         scrollback_current = 0;
1494 }
1495
1496 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1497 {
1498         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1499         struct fbcon_ops *ops = info->fbcon_par;
1500         struct display *p = &fb_display[vc->vc_num];
1501
1502         p->yscroll -= count;
1503
1504         if (p->yscroll < 0) {
1505                 p->yscroll += p->vrows - vc->vc_rows;
1506                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1507         }
1508
1509         ops->var.xoffset = 0;
1510         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1511         ops->var.vmode &= ~FB_VMODE_YWRAP;
1512         ops->update_start(info);
1513         fbcon_clear_margins(vc, 1);
1514         scrollback_max -= count;
1515         if (scrollback_max < 0)
1516                 scrollback_max = 0;
1517         scrollback_current = 0;
1518 }
1519
1520 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1521                                   long delta)
1522 {
1523         int count = vc->vc_rows;
1524         unsigned short *d, *s;
1525         unsigned long n;
1526         int line = 0;
1527
1528         d = (u16 *) softback_curr;
1529         if (d == (u16 *) softback_in)
1530                 d = (u16 *) vc->vc_origin;
1531         n = softback_curr + delta * vc->vc_size_row;
1532         softback_lines -= delta;
1533         if (delta < 0) {
1534                 if (softback_curr < softback_top && n < softback_buf) {
1535                         n += softback_end - softback_buf;
1536                         if (n < softback_top) {
1537                                 softback_lines -=
1538                                     (softback_top - n) / vc->vc_size_row;
1539                                 n = softback_top;
1540                         }
1541                 } else if (softback_curr >= softback_top
1542                            && n < softback_top) {
1543                         softback_lines -=
1544                             (softback_top - n) / vc->vc_size_row;
1545                         n = softback_top;
1546                 }
1547         } else {
1548                 if (softback_curr > softback_in && n >= softback_end) {
1549                         n += softback_buf - softback_end;
1550                         if (n > softback_in) {
1551                                 n = softback_in;
1552                                 softback_lines = 0;
1553                         }
1554                 } else if (softback_curr <= softback_in && n > softback_in) {
1555                         n = softback_in;
1556                         softback_lines = 0;
1557                 }
1558         }
1559         if (n == softback_curr)
1560                 return;
1561         softback_curr = n;
1562         s = (u16 *) softback_curr;
1563         if (s == (u16 *) softback_in)
1564                 s = (u16 *) vc->vc_origin;
1565         while (count--) {
1566                 unsigned short *start;
1567                 unsigned short *le;
1568                 unsigned short c;
1569                 int x = 0;
1570                 unsigned short attr = 1;
1571
1572                 start = s;
1573                 le = advance_row(s, 1);
1574                 do {
1575                         c = scr_readw(s);
1576                         if (attr != (c & 0xff00)) {
1577                                 attr = c & 0xff00;
1578                                 if (s > start) {
1579                                         fbcon_putcs(vc, start, s - start,
1580                                                     line, x);
1581                                         x += s - start;
1582                                         start = s;
1583                                 }
1584                         }
1585                         if (c == scr_readw(d)) {
1586                                 if (s > start) {
1587                                         fbcon_putcs(vc, start, s - start,
1588                                                     line, x);
1589                                         x += s - start + 1;
1590                                         start = s + 1;
1591                                 } else {
1592                                         x++;
1593                                         start++;
1594                                 }
1595                         }
1596                         s++;
1597                         d++;
1598                 } while (s < le);
1599                 if (s > start)
1600                         fbcon_putcs(vc, start, s - start, line, x);
1601                 line++;
1602                 if (d == (u16 *) softback_end)
1603                         d = (u16 *) softback_buf;
1604                 if (d == (u16 *) softback_in)
1605                         d = (u16 *) vc->vc_origin;
1606                 if (s == (u16 *) softback_end)
1607                         s = (u16 *) softback_buf;
1608                 if (s == (u16 *) softback_in)
1609                         s = (u16 *) vc->vc_origin;
1610         }
1611 }
1612
1613 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1614                               int line, int count, int dy)
1615 {
1616         unsigned short *s = (unsigned short *)
1617                 (vc->vc_origin + vc->vc_size_row * line);
1618
1619         while (count--) {
1620                 unsigned short *start = s;
1621                 unsigned short *le = advance_row(s, 1);
1622                 unsigned short c;
1623                 int x = 0;
1624                 unsigned short attr = 1;
1625
1626                 do {
1627                         c = scr_readw(s);
1628                         if (attr != (c & 0xff00)) {
1629                                 attr = c & 0xff00;
1630                                 if (s > start) {
1631                                         fbcon_putcs(vc, start, s - start,
1632                                                     dy, x);
1633                                         x += s - start;
1634                                         start = s;
1635                                 }
1636                         }
1637                         console_conditional_schedule();
1638                         s++;
1639                 } while (s < le);
1640                 if (s > start)
1641                         fbcon_putcs(vc, start, s - start, dy, x);
1642                 console_conditional_schedule();
1643                 dy++;
1644         }
1645 }
1646
1647 static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
1648                         struct display *p, int line, int count, int ycount)
1649 {
1650         int offset = ycount * vc->vc_cols;
1651         unsigned short *d = (unsigned short *)
1652             (vc->vc_origin + vc->vc_size_row * line);
1653         unsigned short *s = d + offset;
1654         struct fbcon_ops *ops = info->fbcon_par;
1655
1656         while (count--) {
1657                 unsigned short *start = s;
1658                 unsigned short *le = advance_row(s, 1);
1659                 unsigned short c;
1660                 int x = 0;
1661
1662                 do {
1663                         c = scr_readw(s);
1664
1665                         if (c == scr_readw(d)) {
1666                                 if (s > start) {
1667                                         ops->bmove(vc, info, line + ycount, x,
1668                                                    line, x, 1, s-start);
1669                                         x += s - start + 1;
1670                                         start = s + 1;
1671                                 } else {
1672                                         x++;
1673                                         start++;
1674                                 }
1675                         }
1676
1677                         scr_writew(c, d);
1678                         console_conditional_schedule();
1679                         s++;
1680                         d++;
1681                 } while (s < le);
1682                 if (s > start)
1683                         ops->bmove(vc, info, line + ycount, x, line, x, 1,
1684                                    s-start);
1685                 console_conditional_schedule();
1686                 if (ycount > 0)
1687                         line++;
1688                 else {
1689                         line--;
1690                         /* NOTE: We subtract two lines from these pointers */
1691                         s -= vc->vc_size_row;
1692                         d -= vc->vc_size_row;
1693                 }
1694         }
1695 }
1696
1697 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1698                          int line, int count, int offset)
1699 {
1700         unsigned short *d = (unsigned short *)
1701             (vc->vc_origin + vc->vc_size_row * line);
1702         unsigned short *s = d + offset;
1703
1704         while (count--) {
1705                 unsigned short *start = s;
1706                 unsigned short *le = advance_row(s, 1);
1707                 unsigned short c;
1708                 int x = 0;
1709                 unsigned short attr = 1;
1710
1711                 do {
1712                         c = scr_readw(s);
1713                         if (attr != (c & 0xff00)) {
1714                                 attr = c & 0xff00;
1715                                 if (s > start) {
1716                                         fbcon_putcs(vc, start, s - start,
1717                                                     line, x);
1718                                         x += s - start;
1719                                         start = s;
1720                                 }
1721                         }
1722                         if (c == scr_readw(d)) {
1723                                 if (s > start) {
1724                                         fbcon_putcs(vc, start, s - start,
1725                                                      line, x);
1726                                         x += s - start + 1;
1727                                         start = s + 1;
1728                                 } else {
1729                                         x++;
1730                                         start++;
1731                                 }
1732                         }
1733                         scr_writew(c, d);
1734                         console_conditional_schedule();
1735                         s++;
1736                         d++;
1737                 } while (s < le);
1738                 if (s > start)
1739                         fbcon_putcs(vc, start, s - start, line, x);
1740                 console_conditional_schedule();
1741                 if (offset > 0)
1742                         line++;
1743                 else {
1744                         line--;
1745                         /* NOTE: We subtract two lines from these pointers */
1746                         s -= vc->vc_size_row;
1747                         d -= vc->vc_size_row;
1748                 }
1749         }
1750 }
1751
1752 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1753                                        int count)
1754 {
1755         unsigned short *p;
1756
1757         if (vc->vc_num != fg_console)
1758                 return;
1759         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1760
1761         while (count) {
1762                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1763                 count--;
1764                 p = advance_row(p, 1);
1765                 softback_in += vc->vc_size_row;
1766                 if (softback_in == softback_end)
1767                         softback_in = softback_buf;
1768                 if (softback_in == softback_top) {
1769                         softback_top += vc->vc_size_row;
1770                         if (softback_top == softback_end)
1771                                 softback_top = softback_buf;
1772                 }
1773         }
1774         softback_curr = softback_in;
1775 }
1776
1777 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1778                         int count)
1779 {
1780         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1781         struct display *p = &fb_display[vc->vc_num];
1782         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1783
1784         if (fbcon_is_inactive(vc, info))
1785                 return -EINVAL;
1786
1787         fbcon_cursor(vc, CM_ERASE);
1788
1789         /*
1790          * ++Geert: Only use ywrap/ypan if the console is in text mode
1791          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1792          *           whole screen (prevents flicker).
1793          */
1794
1795         switch (dir) {
1796         case SM_UP:
1797                 if (count > vc->vc_rows)        /* Maximum realistic size */
1798                         count = vc->vc_rows;
1799                 if (softback_top)
1800                         fbcon_softback_note(vc, t, count);
1801                 if (logo_shown >= 0)
1802                         goto redraw_up;
1803                 switch (p->scrollmode) {
1804                 case SCROLL_MOVE:
1805                         fbcon_redraw_blit(vc, info, p, t, b - t - count,
1806                                      count);
1807                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1808                         scr_memsetw((unsigned short *) (vc->vc_origin +
1809                                                         vc->vc_size_row *
1810                                                         (b - count)),
1811                                     vc->vc_video_erase_char,
1812                                     vc->vc_size_row * count);
1813                         return 1;
1814                         break;
1815
1816                 case SCROLL_WRAP_MOVE:
1817                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1818                                 if (t > 0)
1819                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1820                                                     vc->vc_cols);
1821                                 ywrap_up(vc, count);
1822                                 if (vc->vc_rows - b > 0)
1823                                         fbcon_bmove(vc, b - count, 0, b, 0,
1824                                                     vc->vc_rows - b,
1825                                                     vc->vc_cols);
1826                         } else if (info->flags & FBINFO_READS_FAST)
1827                                 fbcon_bmove(vc, t + count, 0, t, 0,
1828                                             b - t - count, vc->vc_cols);
1829                         else
1830                                 goto redraw_up;
1831                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1832                         break;
1833
1834                 case SCROLL_PAN_REDRAW:
1835                         if ((p->yscroll + count <=
1836                              2 * (p->vrows - vc->vc_rows))
1837                             && ((!scroll_partial && (b - t == vc->vc_rows))
1838                                 || (scroll_partial
1839                                     && (b - t - count >
1840                                         3 * vc->vc_rows >> 2)))) {
1841                                 if (t > 0)
1842                                         fbcon_redraw_move(vc, p, 0, t, count);
1843                                 ypan_up_redraw(vc, t, count);
1844                                 if (vc->vc_rows - b > 0)
1845                                         fbcon_redraw_move(vc, p, b,
1846                                                           vc->vc_rows - b, b);
1847                         } else
1848                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1849                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1850                         break;
1851
1852                 case SCROLL_PAN_MOVE:
1853                         if ((p->yscroll + count <=
1854                              2 * (p->vrows - vc->vc_rows))
1855                             && ((!scroll_partial && (b - t == vc->vc_rows))
1856                                 || (scroll_partial
1857                                     && (b - t - count >
1858                                         3 * vc->vc_rows >> 2)))) {
1859                                 if (t > 0)
1860                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1861                                                     vc->vc_cols);
1862                                 ypan_up(vc, count);
1863                                 if (vc->vc_rows - b > 0)
1864                                         fbcon_bmove(vc, b - count, 0, b, 0,
1865                                                     vc->vc_rows - b,
1866                                                     vc->vc_cols);
1867                         } else if (info->flags & FBINFO_READS_FAST)
1868                                 fbcon_bmove(vc, t + count, 0, t, 0,
1869                                             b - t - count, vc->vc_cols);
1870                         else
1871                                 goto redraw_up;
1872                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1873                         break;
1874
1875                 case SCROLL_REDRAW:
1876                       redraw_up:
1877                         fbcon_redraw(vc, p, t, b - t - count,
1878                                      count * vc->vc_cols);
1879                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1880                         scr_memsetw((unsigned short *) (vc->vc_origin +
1881                                                         vc->vc_size_row *
1882                                                         (b - count)),
1883                                     vc->vc_video_erase_char,
1884                                     vc->vc_size_row * count);
1885                         return 1;
1886                 }
1887                 break;
1888
1889         case SM_DOWN:
1890                 if (count > vc->vc_rows)        /* Maximum realistic size */
1891                         count = vc->vc_rows;
1892                 if (logo_shown >= 0)
1893                         goto redraw_down;
1894                 switch (p->scrollmode) {
1895                 case SCROLL_MOVE:
1896                         fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
1897                                      -count);
1898                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1899                         scr_memsetw((unsigned short *) (vc->vc_origin +
1900                                                         vc->vc_size_row *
1901                                                         t),
1902                                     vc->vc_video_erase_char,
1903                                     vc->vc_size_row * count);
1904                         return 1;
1905                         break;
1906
1907                 case SCROLL_WRAP_MOVE:
1908                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1909                                 if (vc->vc_rows - b > 0)
1910                                         fbcon_bmove(vc, b, 0, b - count, 0,
1911                                                     vc->vc_rows - b,
1912                                                     vc->vc_cols);
1913                                 ywrap_down(vc, count);
1914                                 if (t > 0)
1915                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1916                                                     vc->vc_cols);
1917                         } else if (info->flags & FBINFO_READS_FAST)
1918                                 fbcon_bmove(vc, t, 0, t + count, 0,
1919                                             b - t - count, vc->vc_cols);
1920                         else
1921                                 goto redraw_down;
1922                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1923                         break;
1924
1925                 case SCROLL_PAN_MOVE:
1926                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1927                             && ((!scroll_partial && (b - t == vc->vc_rows))
1928                                 || (scroll_partial
1929                                     && (b - t - count >
1930                                         3 * vc->vc_rows >> 2)))) {
1931                                 if (vc->vc_rows - b > 0)
1932                                         fbcon_bmove(vc, b, 0, b - count, 0,
1933                                                     vc->vc_rows - b,
1934                                                     vc->vc_cols);
1935                                 ypan_down(vc, count);
1936                                 if (t > 0)
1937                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1938                                                     vc->vc_cols);
1939                         } else if (info->flags & FBINFO_READS_FAST)
1940                                 fbcon_bmove(vc, t, 0, t + count, 0,
1941                                             b - t - count, vc->vc_cols);
1942                         else
1943                                 goto redraw_down;
1944                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1945                         break;
1946
1947                 case SCROLL_PAN_REDRAW:
1948                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1949                             && ((!scroll_partial && (b - t == vc->vc_rows))
1950                                 || (scroll_partial
1951                                     && (b - t - count >
1952                                         3 * vc->vc_rows >> 2)))) {
1953                                 if (vc->vc_rows - b > 0)
1954                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1955                                                           b - count);
1956                                 ypan_down_redraw(vc, t, count);
1957                                 if (t > 0)
1958                                         fbcon_redraw_move(vc, p, count, t, 0);
1959                         } else
1960                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1961                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1962                         break;
1963
1964                 case SCROLL_REDRAW:
1965                       redraw_down:
1966                         fbcon_redraw(vc, p, b - 1, b - t - count,
1967                                      -count * vc->vc_cols);
1968                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1969                         scr_memsetw((unsigned short *) (vc->vc_origin +
1970                                                         vc->vc_size_row *
1971                                                         t),
1972                                     vc->vc_video_erase_char,
1973                                     vc->vc_size_row * count);
1974                         return 1;
1975                 }
1976         }
1977         return 0;
1978 }
1979
1980
1981 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1982                         int height, int width)
1983 {
1984         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1985         struct display *p = &fb_display[vc->vc_num];
1986
1987         if (fbcon_is_inactive(vc, info))
1988                 return;
1989
1990         if (!width || !height)
1991                 return;
1992
1993         /*  Split blits that cross physical y_wrap case.
1994          *  Pathological case involves 4 blits, better to use recursive
1995          *  code rather than unrolled case
1996          *
1997          *  Recursive invocations don't need to erase the cursor over and
1998          *  over again, so we use fbcon_bmove_rec()
1999          */
2000         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
2001                         p->vrows - p->yscroll);
2002 }
2003
2004 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
2005                             int dy, int dx, int height, int width, u_int y_break)
2006 {
2007         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2008         struct fbcon_ops *ops = info->fbcon_par;
2009         u_int b;
2010
2011         if (sy < y_break && sy + height > y_break) {
2012                 b = y_break - sy;
2013                 if (dy < sy) {  /* Avoid trashing self */
2014                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2015                                         y_break);
2016                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2017                                         height - b, width, y_break);
2018                 } else {
2019                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2020                                         height - b, width, y_break);
2021                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2022                                         y_break);
2023                 }
2024                 return;
2025         }
2026
2027         if (dy < y_break && dy + height > y_break) {
2028                 b = y_break - dy;
2029                 if (dy < sy) {  /* Avoid trashing self */
2030                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2031                                         y_break);
2032                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2033                                         height - b, width, y_break);
2034                 } else {
2035                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2036                                         height - b, width, y_break);
2037                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2038                                         y_break);
2039                 }
2040                 return;
2041         }
2042         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
2043                    height, width);
2044 }
2045
2046 static void updatescrollmode(struct display *p,
2047                                         struct fb_info *info,
2048                                         struct vc_data *vc)
2049 {
2050         struct fbcon_ops *ops = info->fbcon_par;
2051         int fh = vc->vc_font.height;
2052         int cap = info->flags;
2053         u16 t = 0;
2054         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
2055                                   info->fix.xpanstep);
2056         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
2057         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2058         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
2059                                    info->var.xres_virtual);
2060         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
2061                 divides(ypan, vc->vc_font.height) && vyres > yres;
2062         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
2063                 divides(ywrap, vc->vc_font.height) &&
2064                 divides(vc->vc_font.height, vyres) &&
2065                 divides(vc->vc_font.height, yres);
2066         int reading_fast = cap & FBINFO_READS_FAST;
2067         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
2068                 !(cap & FBINFO_HWACCEL_DISABLED);
2069         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
2070                 !(cap & FBINFO_HWACCEL_DISABLED);
2071
2072         p->vrows = vyres/fh;
2073         if (yres > (fh * (vc->vc_rows + 1)))
2074                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
2075         if ((yres % fh) && (vyres % fh < yres % fh))
2076                 p->vrows--;
2077
2078         if (good_wrap || good_pan) {
2079                 if (reading_fast || fast_copyarea)
2080                         p->scrollmode = good_wrap ?
2081                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
2082                 else
2083                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
2084                                 SCROLL_PAN_REDRAW;
2085         } else {
2086                 if (reading_fast || (fast_copyarea && !fast_imageblit))
2087                         p->scrollmode = SCROLL_MOVE;
2088                 else
2089                         p->scrollmode = SCROLL_REDRAW;
2090         }
2091 }
2092
2093 static int fbcon_resize(struct vc_data *vc, unsigned int width,
2094                         unsigned int height, unsigned int user)
2095 {
2096         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2097         struct fbcon_ops *ops = info->fbcon_par;
2098         struct display *p = &fb_display[vc->vc_num];
2099         struct fb_var_screeninfo var = info->var;
2100         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2101
2102         virt_w = FBCON_SWAP(ops->rotate, width, height);
2103         virt_h = FBCON_SWAP(ops->rotate, height, width);
2104         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2105                                  vc->vc_font.height);
2106         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2107                                  vc->vc_font.width);
2108         var.xres = virt_w * virt_fw;
2109         var.yres = virt_h * virt_fh;
2110         x_diff = info->var.xres - var.xres;
2111         y_diff = info->var.yres - var.yres;
2112         if (x_diff < 0 || x_diff > virt_fw ||
2113             y_diff < 0 || y_diff > virt_fh) {
2114                 const struct fb_videomode *mode;
2115
2116                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2117                 mode = fb_find_best_mode(&var, &info->modelist);
2118                 if (mode == NULL)
2119                         return -EINVAL;
2120                 display_to_var(&var, p);
2121                 fb_videomode_to_var(&var, mode);
2122
2123                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2124                         return -EINVAL;
2125
2126                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2127                 if (CON_IS_VISIBLE(vc)) {
2128                         var.activate = FB_ACTIVATE_NOW |
2129                                 FB_ACTIVATE_FORCE;
2130                         fb_set_var(info, &var);
2131                 }
2132                 var_to_display(p, &info->var, info);
2133                 ops->var = info->var;
2134         }
2135         updatescrollmode(p, info, vc);
2136         return 0;
2137 }
2138
2139 static int fbcon_switch(struct vc_data *vc)
2140 {
2141         struct fb_info *info, *old_info = NULL;
2142         struct fbcon_ops *ops;
2143         struct display *p = &fb_display[vc->vc_num];
2144         struct fb_var_screeninfo var;
2145         int i, ret, prev_console, charcnt = 256;
2146
2147         info = registered_fb[con2fb_map[vc->vc_num]];
2148         ops = info->fbcon_par;
2149
2150         if (softback_top) {
2151                 if (softback_lines)
2152                         fbcon_set_origin(vc);
2153                 softback_top = softback_curr = softback_in = softback_buf;
2154                 softback_lines = 0;
2155                 fbcon_update_softback(vc);
2156         }
2157
2158         if (logo_shown >= 0) {
2159                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2160
2161                 if (conp2->vc_top == logo_lines
2162                     && conp2->vc_bottom == conp2->vc_rows)
2163                         conp2->vc_top = 0;
2164                 logo_shown = FBCON_LOGO_CANSHOW;
2165         }
2166
2167         prev_console = ops->currcon;
2168         if (prev_console != -1)
2169                 old_info = registered_fb[con2fb_map[prev_console]];
2170         /*
2171          * FIXME: If we have multiple fbdev's loaded, we need to
2172          * update all info->currcon.  Perhaps, we can place this
2173          * in a centralized structure, but this might break some
2174          * drivers.
2175          *
2176          * info->currcon = vc->vc_num;
2177          */
2178         for (i = 0; i < FB_MAX; i++) {
2179                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2180                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2181
2182                         o->currcon = vc->vc_num;
2183                 }
2184         }
2185         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2186         display_to_var(&var, p);
2187         var.activate = FB_ACTIVATE_NOW;
2188
2189         /*
2190          * make sure we don't unnecessarily trip the memcmp()
2191          * in fb_set_var()
2192          */
2193         info->var.activate = var.activate;
2194         var.vmode |= info->var.vmode & ~FB_VMODE_MASK;
2195         fb_set_var(info, &var);
2196         ops->var = info->var;
2197
2198         if (old_info != NULL && (old_info != info ||
2199                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2200                 if (info->fbops->fb_set_par) {
2201                         ret = info->fbops->fb_set_par(info);
2202
2203                         if (ret)
2204                                 printk(KERN_ERR "fbcon_switch: detected "
2205                                         "unhandled fb_set_par error, "
2206                                         "error code %d\n", ret);
2207                 }
2208
2209                 if (old_info != info)
2210                         fbcon_del_cursor_timer(old_info);
2211         }
2212
2213         if (fbcon_is_inactive(vc, info) ||
2214             ops->blank_state != FB_BLANK_UNBLANK)
2215                 fbcon_del_cursor_timer(info);
2216         else
2217                 fbcon_add_cursor_timer(info);
2218
2219         set_blitting_type(vc, info);
2220         ops->cursor_reset = 1;
2221
2222         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2223                 ops->rotate = FB_ROTATE_UR;
2224                 set_blitting_type(vc, info);
2225         }
2226
2227         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2228         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2229
2230         if (p->userfont)
2231                 charcnt = FNTCHARCNT(vc->vc_font.data);
2232
2233         if (charcnt > 256)
2234                 vc->vc_complement_mask <<= 1;
2235
2236         updatescrollmode(p, info, vc);
2237
2238         switch (p->scrollmode) {
2239         case SCROLL_WRAP_MOVE:
2240                 scrollback_phys_max = p->vrows - vc->vc_rows;
2241                 break;
2242         case SCROLL_PAN_MOVE:
2243         case SCROLL_PAN_REDRAW:
2244                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2245                 if (scrollback_phys_max < 0)
2246                         scrollback_phys_max = 0;
2247                 break;
2248         default:
2249                 scrollback_phys_max = 0;
2250                 break;
2251         }
2252
2253         scrollback_max = 0;
2254         scrollback_current = 0;
2255
2256         if (!fbcon_is_inactive(vc, info)) {
2257             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2258             ops->update_start(info);
2259         }
2260
2261         fbcon_set_palette(vc, color_table);
2262         fbcon_clear_margins(vc, 0);
2263
2264         if (logo_shown == FBCON_LOGO_DRAW) {
2265
2266                 logo_shown = fg_console;
2267                 /* This is protected above by initmem_freed */
2268                 fb_show_logo(info, ops->rotate);
2269                 update_region(vc,
2270                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2271                               vc->vc_size_row * (vc->vc_bottom -
2272                                                  vc->vc_top) / 2);
2273                 return 0;
2274         }
2275         return 1;
2276 }
2277
2278 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2279                                 int blank)
2280 {
2281         struct fb_event event;
2282
2283         if (blank) {
2284                 unsigned short charmask = vc->vc_hi_font_mask ?
2285                         0x1ff : 0xff;
2286                 unsigned short oldc;
2287
2288                 oldc = vc->vc_video_erase_char;
2289                 vc->vc_video_erase_char &= charmask;
2290                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2291                 vc->vc_video_erase_char = oldc;
2292         }
2293
2294
2295         if (!lock_fb_info(info))
2296                 return;
2297         event.info = info;
2298         event.data = &blank;
2299         fb_notifier_call_chain(FB_EVENT_CONBLANK, &event);
2300         unlock_fb_info(info);
2301 }
2302
2303 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2304 {
2305         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2306         struct fbcon_ops *ops = info->fbcon_par;
2307
2308         if (mode_switch) {
2309                 struct fb_var_screeninfo var = info->var;
2310
2311                 ops->graphics = 1;
2312
2313                 if (!blank) {
2314                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2315                         fb_set_var(info, &var);
2316                         ops->graphics = 0;
2317                         ops->var = info->var;
2318                 }
2319         }
2320
2321         if (!fbcon_is_inactive(vc, info)) {
2322                 if (ops->blank_state != blank) {
2323                         ops->blank_state = blank;
2324                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2325                         ops->cursor_flash = (!blank);
2326
2327                         if (!(info->flags & FBINFO_MISC_USEREVENT))
2328                                 if (fb_blank(info, blank))
2329                                         fbcon_generic_blank(vc, info, blank);
2330                 }
2331
2332                 if (!blank)
2333                         update_screen(vc);
2334         }
2335
2336         if (mode_switch || fbcon_is_inactive(vc, info) ||
2337             ops->blank_state != FB_BLANK_UNBLANK)
2338                 fbcon_del_cursor_timer(info);
2339         else
2340                 fbcon_add_cursor_timer(info);
2341
2342         return 0;
2343 }
2344
2345 static int fbcon_debug_enter(struct vc_data *vc)
2346 {
2347         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2348         struct fbcon_ops *ops = info->fbcon_par;
2349
2350         ops->save_graphics = ops->graphics;
2351         ops->graphics = 0;
2352         if (info->fbops->fb_debug_enter)
2353                 info->fbops->fb_debug_enter(info);
2354         fbcon_set_palette(vc, color_table);
2355         return 0;
2356 }
2357
2358 static int fbcon_debug_leave(struct vc_data *vc)
2359 {
2360         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2361         struct fbcon_ops *ops = info->fbcon_par;
2362
2363         ops->graphics = ops->save_graphics;
2364         if (info->fbops->fb_debug_leave)
2365                 info->fbops->fb_debug_leave(info);
2366         return 0;
2367 }
2368
2369 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2370 {
2371         u8 *fontdata = vc->vc_font.data;
2372         u8 *data = font->data;
2373         int i, j;
2374
2375         font->width = vc->vc_font.width;
2376         font->height = vc->vc_font.height;
2377         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2378         if (!font->data)
2379                 return 0;
2380
2381         if (font->width <= 8) {
2382                 j = vc->vc_font.height;
2383                 for (i = 0; i < font->charcount; i++) {
2384                         memcpy(data, fontdata, j);
2385                         memset(data + j, 0, 32 - j);
2386                         data += 32;
2387                         fontdata += j;
2388                 }
2389         } else if (font->width <= 16) {
2390                 j = vc->vc_font.height * 2;
2391                 for (i = 0; i < font->charcount; i++) {
2392                         memcpy(data, fontdata, j);
2393                         memset(data + j, 0, 64 - j);
2394                         data += 64;
2395                         fontdata += j;
2396                 }
2397         } else if (font->width <= 24) {
2398                 for (i = 0; i < font->charcount; i++) {
2399                         for (j = 0; j < vc->vc_font.height; j++) {
2400                                 *data++ = fontdata[0];
2401                                 *data++ = fontdata[1];
2402                                 *data++ = fontdata[2];
2403                                 fontdata += sizeof(u32);
2404                         }
2405                         memset(data, 0, 3 * (32 - j));
2406                         data += 3 * (32 - j);
2407                 }
2408         } else {
2409                 j = vc->vc_font.height * 4;
2410                 for (i = 0; i < font->charcount; i++) {
2411                         memcpy(data, fontdata, j);
2412                         memset(data + j, 0, 128 - j);
2413                         data += 128;
2414                         fontdata += j;
2415                 }
2416         }
2417         return 0;
2418 }
2419
2420 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2421                              const u8 * data, int userfont)
2422 {
2423         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2424         struct fbcon_ops *ops = info->fbcon_par;
2425         struct display *p = &fb_display[vc->vc_num];
2426         int resize;
2427         int cnt;
2428         char *old_data = NULL;
2429
2430         if (CON_IS_VISIBLE(vc) && softback_lines)
2431                 fbcon_set_origin(vc);
2432
2433         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2434         if (p->userfont)
2435                 old_data = vc->vc_font.data;
2436         if (userfont)
2437                 cnt = FNTCHARCNT(data);
2438         else
2439                 cnt = 256;
2440         vc->vc_font.data = (void *)(p->fontdata = data);
2441         if ((p->userfont = userfont))
2442                 REFCOUNT(data)++;
2443         vc->vc_font.width = w;
2444         vc->vc_font.height = h;
2445         if (vc->vc_hi_font_mask && cnt == 256) {
2446                 vc->vc_hi_font_mask = 0;
2447                 if (vc->vc_can_do_color) {
2448                         vc->vc_complement_mask >>= 1;
2449                         vc->vc_s_complement_mask >>= 1;
2450                 }
2451
2452                 /* ++Edmund: reorder the attribute bits */
2453                 if (vc->vc_can_do_color) {
2454                         unsigned short *cp =
2455                             (unsigned short *) vc->vc_origin;
2456                         int count = vc->vc_screenbuf_size / 2;
2457                         unsigned short c;
2458                         for (; count > 0; count--, cp++) {
2459                                 c = scr_readw(cp);
2460                                 scr_writew(((c & 0xfe00) >> 1) |
2461                                            (c & 0xff), cp);
2462                         }
2463                         c = vc->vc_video_erase_char;
2464                         vc->vc_video_erase_char =
2465                             ((c & 0xfe00) >> 1) | (c & 0xff);
2466                         vc->vc_attr >>= 1;
2467                 }
2468         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2469                 vc->vc_hi_font_mask = 0x100;
2470                 if (vc->vc_can_do_color) {
2471                         vc->vc_complement_mask <<= 1;
2472                         vc->vc_s_complement_mask <<= 1;
2473                 }
2474
2475                 /* ++Edmund: reorder the attribute bits */
2476                 {
2477                         unsigned short *cp =
2478                             (unsigned short *) vc->vc_origin;
2479                         int count = vc->vc_screenbuf_size / 2;
2480                         unsigned short c;
2481                         for (; count > 0; count--, cp++) {
2482                                 unsigned short newc;
2483                                 c = scr_readw(cp);
2484                                 if (vc->vc_can_do_color)
2485                                         newc =
2486                                             ((c & 0xff00) << 1) | (c &
2487                                                                    0xff);
2488                                 else
2489                                         newc = c & ~0x100;
2490                                 scr_writew(newc, cp);
2491                         }
2492                         c = vc->vc_video_erase_char;
2493                         if (vc->vc_can_do_color) {
2494                                 vc->vc_video_erase_char =
2495                                     ((c & 0xff00) << 1) | (c & 0xff);
2496                                 vc->vc_attr <<= 1;
2497                         } else
2498                                 vc->vc_video_erase_char = c & ~0x100;
2499                 }
2500
2501         }
2502
2503         if (resize) {
2504                 int cols, rows;
2505
2506                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2507                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2508                 cols /= w;
2509                 rows /= h;
2510                 vc_resize(vc, cols, rows);
2511                 if (CON_IS_VISIBLE(vc) && softback_buf)
2512                         fbcon_update_softback(vc);
2513         } else if (CON_IS_VISIBLE(vc)
2514                    && vc->vc_mode == KD_TEXT) {
2515                 fbcon_clear_margins(vc, 0);
2516                 update_screen(vc);
2517         }
2518
2519         if (old_data && (--REFCOUNT(old_data) == 0))
2520                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2521         return 0;
2522 }
2523
2524 static int fbcon_copy_font(struct vc_data *vc, int con)
2525 {
2526         struct display *od = &fb_display[con];
2527         struct console_font *f = &vc->vc_font;
2528
2529         if (od->fontdata == f->data)
2530                 return 0;       /* already the same font... */
2531         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2532 }
2533
2534 /*
2535  *  User asked to set font; we are guaranteed that
2536  *      a) width and height are in range 1..32
2537  *      b) charcount does not exceed 512
2538  *  but lets not assume that, since someone might someday want to use larger
2539  *  fonts. And charcount of 512 is small for unicode support.
2540  *
2541  *  However, user space gives the font in 32 rows , regardless of
2542  *  actual font height. So a new API is needed if support for larger fonts
2543  *  is ever implemented.
2544  */
2545
2546 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2547 {
2548         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2549         unsigned charcount = font->charcount;
2550         int w = font->width;
2551         int h = font->height;
2552         int size;
2553         int i, csum;
2554         u8 *new_data, *data = font->data;
2555         int pitch = (font->width+7) >> 3;
2556
2557         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2558          * If not this check should be changed to charcount < 256 */
2559         if (charcount != 256 && charcount != 512)
2560                 return -EINVAL;
2561
2562         /* Make sure drawing engine can handle the font */
2563         if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
2564             !(info->pixmap.blit_y & (1 << (font->height - 1))))
2565                 return -EINVAL;
2566
2567         /* Make sure driver can handle the font length */
2568         if (fbcon_invalid_charcount(info, charcount))
2569                 return -EINVAL;
2570
2571         size = h * pitch * charcount;
2572
2573         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2574
2575         if (!new_data)
2576                 return -ENOMEM;
2577
2578         new_data += FONT_EXTRA_WORDS * sizeof(int);
2579         FNTSIZE(new_data) = size;
2580         FNTCHARCNT(new_data) = charcount;
2581         REFCOUNT(new_data) = 0; /* usage counter */
2582         for (i=0; i< charcount; i++) {
2583                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2584         }
2585
2586         /* Since linux has a nice crc32 function use it for counting font
2587          * checksums. */
2588         csum = crc32(0, new_data, size);
2589
2590         FNTSUM(new_data) = csum;
2591         /* Check if the same font is on some other console already */
2592         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2593                 struct vc_data *tmp = vc_cons[i].d;
2594
2595                 if (fb_display[i].userfont &&
2596                     fb_display[i].fontdata &&
2597                     FNTSUM(fb_display[i].fontdata) == csum &&
2598                     FNTSIZE(fb_display[i].fontdata) == size &&
2599                     tmp->vc_font.width == w &&
2600                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2601                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2602                         new_data = (u8 *)fb_display[i].fontdata;
2603                         break;
2604                 }
2605         }
2606         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2607 }
2608
2609 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2610 {
2611         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2612         const struct font_desc *f;
2613
2614         if (!name)
2615                 f = get_default_font(info->var.xres, info->var.yres,
2616                                      info->pixmap.blit_x, info->pixmap.blit_y);
2617         else if (!(f = find_font(name)))
2618                 return -ENOENT;
2619
2620         font->width = f->width;
2621         font->height = f->height;
2622         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2623 }
2624
2625 static u16 palette_red[16];
2626 static u16 palette_green[16];
2627 static u16 palette_blue[16];
2628
2629 static struct fb_cmap palette_cmap = {
2630         0, 16, palette_red, palette_green, palette_blue, NULL
2631 };
2632
2633 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
2634 {
2635         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2636         int i, j, k, depth;
2637         u8 val;
2638
2639         if (fbcon_is_inactive(vc, info))
2640                 return -EINVAL;
2641
2642         if (!CON_IS_VISIBLE(vc))
2643                 return 0;
2644
2645         depth = fb_get_color_depth(&info->var, &info->fix);
2646         if (depth > 3) {
2647                 for (i = j = 0; i < 16; i++) {
2648                         k = table[i];
2649                         val = vc->vc_palette[j++];
2650                         palette_red[k] = (val << 8) | val;
2651                         val = vc->vc_palette[j++];
2652                         palette_green[k] = (val << 8) | val;
2653                         val = vc->vc_palette[j++];
2654                         palette_blue[k] = (val << 8) | val;
2655                 }
2656                 palette_cmap.len = 16;
2657                 palette_cmap.start = 0;
2658         /*
2659          * If framebuffer is capable of less than 16 colors,
2660          * use default palette of fbcon.
2661          */
2662         } else
2663                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2664
2665         return fb_set_cmap(&palette_cmap, info);
2666 }
2667
2668 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2669 {
2670         unsigned long p;
2671         int line;
2672
2673         if (vc->vc_num != fg_console || !softback_lines)
2674                 return (u16 *) (vc->vc_origin + offset);
2675         line = offset / vc->vc_size_row;
2676         if (line >= softback_lines)
2677                 return (u16 *) (vc->vc_origin + offset -
2678                                 softback_lines * vc->vc_size_row);
2679         p = softback_curr + offset;
2680         if (p >= softback_end)
2681                 p += softback_buf - softback_end;
2682         return (u16 *) p;
2683 }
2684
2685 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2686                                  int *px, int *py)
2687 {
2688         unsigned long ret;
2689         int x, y;
2690
2691         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2692                 unsigned long offset = (pos - vc->vc_origin) / 2;
2693
2694                 x = offset % vc->vc_cols;
2695                 y = offset / vc->vc_cols;
2696                 if (vc->vc_num == fg_console)
2697                         y += softback_lines;
2698                 ret = pos + (vc->vc_cols - x) * 2;
2699         } else if (vc->vc_num == fg_console && softback_lines) {
2700                 unsigned long offset = pos - softback_curr;
2701
2702                 if (pos < softback_curr)
2703                         offset += softback_end - softback_buf;
2704                 offset /= 2;
2705                 x = offset % vc->vc_cols;
2706                 y = offset / vc->vc_cols;
2707                 ret = pos + (vc->vc_cols - x) * 2;
2708                 if (ret == softback_end)
2709                         ret = softback_buf;
2710                 if (ret == softback_in)
2711                         ret = vc->vc_origin;
2712         } else {
2713                 /* Should not happen */
2714                 x = y = 0;
2715                 ret = vc->vc_origin;
2716         }
2717         if (px)
2718                 *px = x;
2719         if (py)
2720                 *py = y;
2721         return ret;
2722 }
2723
2724 /* As we might be inside of softback, we may work with non-contiguous buffer,
2725    that's why we have to use a separate routine. */
2726 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2727 {
2728         while (cnt--) {
2729                 u16 a = scr_readw(p);
2730                 if (!vc->vc_can_do_color)
2731                         a ^= 0x0800;
2732                 else if (vc->vc_hi_font_mask == 0x100)
2733                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2734                             (((a) & 0x0e00) << 4);
2735                 else
2736                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2737                             (((a) & 0x0700) << 4);
2738                 scr_writew(a, p++);
2739                 if (p == (u16 *) softback_end)
2740                         p = (u16 *) softback_buf;
2741                 if (p == (u16 *) softback_in)
2742                         p = (u16 *) vc->vc_origin;
2743         }
2744 }
2745
2746 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
2747 {
2748         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2749         struct fbcon_ops *ops = info->fbcon_par;
2750         struct display *disp = &fb_display[fg_console];
2751         int offset, limit, scrollback_old;
2752
2753         if (softback_top) {
2754                 if (vc->vc_num != fg_console)
2755                         return 0;
2756                 if (vc->vc_mode != KD_TEXT || !lines)
2757                         return 0;
2758                 if (logo_shown >= 0) {
2759                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2760
2761                         if (conp2->vc_top == logo_lines
2762                             && conp2->vc_bottom == conp2->vc_rows)
2763                                 conp2->vc_top = 0;
2764                         if (logo_shown == vc->vc_num) {
2765                                 unsigned long p, q;
2766                                 int i;
2767
2768                                 p = softback_in;
2769                                 q = vc->vc_origin +
2770                                     logo_lines * vc->vc_size_row;
2771                                 for (i = 0; i < logo_lines; i++) {
2772                                         if (p == softback_top)
2773                                                 break;
2774                                         if (p == softback_buf)
2775                                                 p = softback_end;
2776                                         p -= vc->vc_size_row;
2777                                         q -= vc->vc_size_row;
2778                                         scr_memcpyw((u16 *) q, (u16 *) p,
2779                                                     vc->vc_size_row);
2780                                 }
2781                                 softback_in = softback_curr = p;
2782                                 update_region(vc, vc->vc_origin,
2783                                               logo_lines * vc->vc_cols);
2784                         }
2785                         logo_shown = FBCON_LOGO_CANSHOW;
2786                 }
2787                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2788                 fbcon_redraw_softback(vc, disp, lines);
2789                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2790                 return 0;
2791         }
2792
2793         if (!scrollback_phys_max)
2794                 return -ENOSYS;
2795
2796         scrollback_old = scrollback_current;
2797         scrollback_current -= lines;
2798         if (scrollback_current < 0)
2799                 scrollback_current = 0;
2800         else if (scrollback_current > scrollback_max)
2801                 scrollback_current = scrollback_max;
2802         if (scrollback_current == scrollback_old)
2803                 return 0;
2804
2805         if (fbcon_is_inactive(vc, info))
2806                 return 0;
2807
2808         fbcon_cursor(vc, CM_ERASE);
2809
2810         offset = disp->yscroll - scrollback_current;
2811         limit = disp->vrows;
2812         switch (disp->scrollmode) {
2813         case SCROLL_WRAP_MOVE:
2814                 info->var.vmode |= FB_VMODE_YWRAP;
2815                 break;
2816         case SCROLL_PAN_MOVE:
2817         case SCROLL_PAN_REDRAW:
2818                 limit -= vc->vc_rows;
2819                 info->var.vmode &= ~FB_VMODE_YWRAP;
2820                 break;
2821         }
2822         if (offset < 0)
2823                 offset += limit;
2824         else if (offset >= limit)
2825                 offset -= limit;
2826
2827         ops->var.xoffset = 0;
2828         ops->var.yoffset = offset * vc->vc_font.height;
2829         ops->update_start(info);
2830
2831         if (!scrollback_current)
2832                 fbcon_cursor(vc, CM_DRAW);
2833         return 0;
2834 }
2835
2836 static int fbcon_set_origin(struct vc_data *vc)
2837 {
2838         if (softback_lines)
2839                 fbcon_scrolldelta(vc, softback_lines);
2840         return 0;
2841 }
2842
2843 static void fbcon_suspended(struct fb_info *info)
2844 {
2845         struct vc_data *vc = NULL;
2846         struct fbcon_ops *ops = info->fbcon_par;
2847
2848         if (!ops || ops->currcon < 0)
2849                 return;
2850         vc = vc_cons[ops->currcon].d;
2851
2852         /* Clear cursor, restore saved data */
2853         fbcon_cursor(vc, CM_ERASE);
2854 }
2855
2856 static void fbcon_resumed(struct fb_info *info)
2857 {
2858         struct vc_data *vc;
2859         struct fbcon_ops *ops = info->fbcon_par;
2860
2861         if (!ops || ops->currcon < 0)
2862                 return;
2863         vc = vc_cons[ops->currcon].d;
2864
2865         update_screen(vc);
2866 }
2867
2868 static void fbcon_modechanged(struct fb_info *info)
2869 {
2870         struct fbcon_ops *ops = info->fbcon_par;
2871         struct vc_data *vc;
2872         struct display *p;
2873         int rows, cols;
2874
2875         if (!ops || ops->currcon < 0)
2876                 return;
2877         vc = vc_cons[ops->currcon].d;
2878         if (vc->vc_mode != KD_TEXT ||
2879             registered_fb[con2fb_map[ops->currcon]] != info)
2880                 return;
2881
2882         p = &fb_display[vc->vc_num];
2883         set_blitting_type(vc, info);
2884
2885         if (CON_IS_VISIBLE(vc)) {
2886                 var_to_display(p, &info->var, info);
2887                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2888                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2889                 cols /= vc->vc_font.width;
2890                 rows /= vc->vc_font.height;
2891                 vc_resize(vc, cols, rows);
2892                 updatescrollmode(p, info, vc);
2893                 scrollback_max = 0;
2894                 scrollback_current = 0;
2895
2896                 if (!fbcon_is_inactive(vc, info)) {
2897                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2898                     ops->update_start(info);
2899                 }
2900
2901                 fbcon_set_palette(vc, color_table);
2902                 update_screen(vc);
2903                 if (softback_buf)
2904                         fbcon_update_softback(vc);
2905         }
2906 }
2907
2908 static void fbcon_set_all_vcs(struct fb_info *info)
2909 {
2910         struct fbcon_ops *ops = info->fbcon_par;
2911         struct vc_data *vc;
2912         struct display *p;
2913         int i, rows, cols, fg = -1;
2914
2915         if (!ops || ops->currcon < 0)
2916                 return;
2917
2918         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2919                 vc = vc_cons[i].d;
2920                 if (!vc || vc->vc_mode != KD_TEXT ||
2921                     registered_fb[con2fb_map[i]] != info)
2922                         continue;
2923
2924                 if (CON_IS_VISIBLE(vc)) {
2925                         fg = i;
2926                         continue;
2927                 }
2928
2929                 p = &fb_display[vc->vc_num];
2930                 set_blitting_type(vc, info);
2931                 var_to_display(p, &info->var, info);
2932                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2933                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2934                 cols /= vc->vc_font.width;
2935                 rows /= vc->vc_font.height;
2936                 vc_resize(vc, cols, rows);
2937         }
2938
2939         if (fg != -1)
2940                 fbcon_modechanged(info);
2941 }
2942
2943 static int fbcon_mode_deleted(struct fb_info *info,
2944                               struct fb_videomode *mode)
2945 {
2946         struct fb_info *fb_info;
2947         struct display *p;
2948         int i, j, found = 0;
2949
2950         /* before deletion, ensure that mode is not in use */
2951         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2952                 j = con2fb_map[i];
2953                 if (j == -1)
2954                         continue;
2955                 fb_info = registered_fb[j];
2956                 if (fb_info != info)
2957                         continue;
2958                 p = &fb_display[i];
2959                 if (!p || !p->mode)
2960                         continue;
2961                 if (fb_mode_is_equal(p->mode, mode)) {
2962                         found = 1;
2963                         break;
2964                 }
2965         }
2966         return found;
2967 }
2968
2969 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2970 static int fbcon_unbind(void)
2971 {
2972         int ret;
2973
2974         ret = unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
2975                                 fbcon_is_default);
2976
2977         if (!ret)
2978                 fbcon_has_console_bind = 0;
2979
2980         return ret;
2981 }
2982 #else
2983 static inline int fbcon_unbind(void)
2984 {
2985         return -EINVAL;
2986 }
2987 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
2988
2989 static int fbcon_fb_unbind(int idx)
2990 {
2991         int i, new_idx = -1, ret = 0;
2992
2993         if (!fbcon_has_console_bind)
2994                 return 0;
2995
2996         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2997                 if (con2fb_map[i] != idx &&
2998                     con2fb_map[i] != -1) {
2999                         new_idx = i;
3000                         break;
3001                 }
3002         }
3003
3004         if (new_idx != -1) {
3005                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3006                         if (con2fb_map[i] == idx)
3007                                 set_con2fb_map(i, new_idx, 0);
3008                 }
3009         } else
3010                 ret = fbcon_unbind();
3011
3012         return ret;
3013 }
3014
3015 static int fbcon_fb_unregistered(struct fb_info *info)
3016 {
3017         int i, idx;
3018
3019         idx = info->node;
3020         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3021                 if (con2fb_map[i] == idx)
3022                         con2fb_map[i] = -1;
3023         }
3024
3025         if (idx == info_idx) {
3026                 info_idx = -1;
3027
3028                 for (i = 0; i < FB_MAX; i++) {
3029                         if (registered_fb[i] != NULL) {
3030                                 info_idx = i;
3031                                 break;
3032                         }
3033                 }
3034         }
3035
3036         if (info_idx != -1) {
3037                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3038                         if (con2fb_map[i] == -1)
3039                                 con2fb_map[i] = info_idx;
3040                 }
3041         }
3042
3043         if (primary_device == idx)
3044                 primary_device = -1;
3045
3046         if (!num_registered_fb)
3047                 unregister_con_driver(&fb_con);
3048
3049         return 0;
3050 }
3051
3052 static void fbcon_remap_all(int idx)
3053 {
3054         int i;
3055         for (i = first_fb_vc; i <= last_fb_vc; i++)
3056                 set_con2fb_map(i, idx, 0);
3057
3058         if (con_is_bound(&fb_con)) {
3059                 printk(KERN_INFO "fbcon: Remapping primary device, "
3060                        "fb%i, to tty %i-%i\n", idx,
3061                        first_fb_vc + 1, last_fb_vc + 1);
3062                 info_idx = idx;
3063         }
3064 }
3065
3066 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
3067 static void fbcon_select_primary(struct fb_info *info)
3068 {
3069         if (!map_override && primary_device == -1 &&
3070             fb_is_primary_device(info)) {
3071                 int i;
3072
3073                 printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
3074                        info->fix.id, info->node);
3075                 primary_device = info->node;
3076
3077                 for (i = first_fb_vc; i <= last_fb_vc; i++)
3078                         con2fb_map_boot[i] = primary_device;
3079
3080                 if (con_is_bound(&fb_con)) {
3081                         printk(KERN_INFO "fbcon: Remapping primary device, "
3082                                "fb%i, to tty %i-%i\n", info->node,
3083                                first_fb_vc + 1, last_fb_vc + 1);
3084                         info_idx = primary_device;
3085                 }
3086         }
3087
3088 }
3089 #else
3090 static inline void fbcon_select_primary(struct fb_info *info)
3091 {
3092         return;
3093 }
3094 #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
3095
3096 static int fbcon_fb_registered(struct fb_info *info)
3097 {
3098         int ret = 0, i, idx;
3099
3100         idx = info->node;
3101         fbcon_select_primary(info);
3102
3103         if (info_idx == -1) {
3104                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3105                         if (con2fb_map_boot[i] == idx) {
3106                                 info_idx = idx;
3107                                 break;
3108                         }
3109                 }
3110
3111                 if (info_idx != -1)
3112                         ret = fbcon_takeover(1);
3113         } else {
3114                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3115                         if (con2fb_map_boot[i] == idx)
3116                                 set_con2fb_map(i, idx, 0);
3117                 }
3118         }
3119
3120         return ret;
3121 }
3122
3123 static void fbcon_fb_blanked(struct fb_info *info, int blank)
3124 {
3125         struct fbcon_ops *ops = info->fbcon_par;
3126         struct vc_data *vc;
3127
3128         if (!ops || ops->currcon < 0)
3129                 return;
3130
3131         vc = vc_cons[ops->currcon].d;
3132         if (vc->vc_mode != KD_TEXT ||
3133                         registered_fb[con2fb_map[ops->currcon]] != info)
3134                 return;
3135
3136         if (CON_IS_VISIBLE(vc)) {
3137                 if (blank)
3138                         do_blank_screen(0);
3139                 else
3140                         do_unblank_screen(0);
3141         }
3142         ops->blank_state = blank;
3143 }
3144
3145 static void fbcon_new_modelist(struct fb_info *info)
3146 {
3147         int i;
3148         struct vc_data *vc;
3149         struct fb_var_screeninfo var;
3150         const struct fb_videomode *mode;
3151
3152         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3153                 if (registered_fb[con2fb_map[i]] != info)
3154                         continue;
3155                 if (!fb_display[i].mode)
3156                         continue;
3157                 vc = vc_cons[i].d;
3158                 display_to_var(&var, &fb_display[i]);
3159                 mode = fb_find_nearest_mode(fb_display[i].mode,
3160                                             &info->modelist);
3161                 fb_videomode_to_var(&var, mode);
3162                 fbcon_set_disp(info, &var, vc->vc_num);
3163         }
3164 }
3165
3166 static void fbcon_get_requirement(struct fb_info *info,
3167                                   struct fb_blit_caps *caps)
3168 {
3169         struct vc_data *vc;
3170         struct display *p;
3171
3172         if (caps->flags) {
3173                 int i, charcnt;
3174
3175                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3176                         vc = vc_cons[i].d;
3177                         if (vc && vc->vc_mode == KD_TEXT &&
3178                             info->node == con2fb_map[i]) {
3179                                 p = &fb_display[i];
3180                                 caps->x |= 1 << (vc->vc_font.width - 1);
3181                                 caps->y |= 1 << (vc->vc_font.height - 1);
3182                                 charcnt = (p->userfont) ?
3183                                         FNTCHARCNT(p->fontdata) : 256;
3184                                 if (caps->len < charcnt)
3185                                         caps->len = charcnt;
3186                         }
3187                 }
3188         } else {
3189                 vc = vc_cons[fg_console].d;
3190
3191                 if (vc && vc->vc_mode == KD_TEXT &&
3192                     info->node == con2fb_map[fg_console]) {
3193                         p = &fb_display[fg_console];
3194                         caps->x = 1 << (vc->vc_font.width - 1);
3195                         caps->y = 1 << (vc->vc_font.height - 1);
3196                         caps->len = (p->userfont) ?
3197                                 FNTCHARCNT(p->fontdata) : 256;
3198                 }
3199         }
3200 }
3201
3202 static int fbcon_event_notify(struct notifier_block *self,
3203                               unsigned long action, void *data)
3204 {
3205         struct fb_event *event = data;
3206         struct fb_info *info = event->info;
3207         struct fb_videomode *mode;
3208         struct fb_con2fbmap *con2fb;
3209         struct fb_blit_caps *caps;
3210         int idx, ret = 0;
3211
3212         /*
3213          * ignore all events except driver registration and deregistration
3214          * if fbcon is not active
3215          */
3216         if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
3217                                   action == FB_EVENT_FB_UNREGISTERED))
3218                 goto done;
3219
3220         switch(action) {
3221         case FB_EVENT_SUSPEND:
3222                 fbcon_suspended(info);
3223                 break;
3224         case FB_EVENT_RESUME:
3225                 fbcon_resumed(info);
3226                 break;
3227         case FB_EVENT_MODE_CHANGE:
3228                 fbcon_modechanged(info);
3229                 break;
3230         case FB_EVENT_MODE_CHANGE_ALL:
3231                 fbcon_set_all_vcs(info);
3232                 break;
3233         case FB_EVENT_MODE_DELETE:
3234                 mode = event->data;
3235                 ret = fbcon_mode_deleted(info, mode);
3236                 break;
3237         case FB_EVENT_FB_UNBIND:
3238                 idx = info->node;
3239                 ret = fbcon_fb_unbind(idx);
3240                 break;
3241         case FB_EVENT_FB_REGISTERED:
3242                 ret = fbcon_fb_registered(info);
3243                 break;
3244         case FB_EVENT_FB_UNREGISTERED:
3245                 ret = fbcon_fb_unregistered(info);
3246                 break;
3247         case FB_EVENT_SET_CONSOLE_MAP:
3248                 con2fb = event->data;
3249                 ret = set_con2fb_map(con2fb->console - 1,
3250                                      con2fb->framebuffer, 1);
3251                 break;
3252         case FB_EVENT_GET_CONSOLE_MAP:
3253                 con2fb = event->data;
3254                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
3255                 break;
3256         case FB_EVENT_BLANK:
3257                 fbcon_fb_blanked(info, *(int *)event->data);
3258                 break;
3259         case FB_EVENT_NEW_MODELIST:
3260                 fbcon_new_modelist(info);
3261                 break;
3262         case FB_EVENT_GET_REQ:
3263                 caps = event->data;
3264                 fbcon_get_requirement(info, caps);
3265                 break;
3266         case FB_EVENT_REMAP_ALL_CONSOLE:
3267                 idx = info->node;
3268                 fbcon_remap_all(idx);
3269                 break;
3270         }
3271 done:
3272         return ret;
3273 }
3274
3275 /*
3276  *  The console `switch' structure for the frame buffer based console
3277  */
3278
3279 static const struct consw fb_con = {
3280         .owner                  = THIS_MODULE,
3281         .con_startup            = fbcon_startup,
3282         .con_init               = fbcon_init,
3283         .con_deinit             = fbcon_deinit,
3284         .con_clear              = fbcon_clear,
3285         .con_putc               = fbcon_putc,
3286         .con_putcs              = fbcon_putcs,
3287         .con_cursor             = fbcon_cursor,
3288         .con_scroll             = fbcon_scroll,
3289         .con_bmove              = fbcon_bmove,
3290         .con_switch             = fbcon_switch,
3291         .con_blank              = fbcon_blank,
3292         .con_font_set           = fbcon_set_font,
3293         .con_font_get           = fbcon_get_font,
3294         .con_font_default       = fbcon_set_def_font,
3295         .con_font_copy          = fbcon_copy_font,
3296         .con_set_palette        = fbcon_set_palette,
3297         .con_scrolldelta        = fbcon_scrolldelta,
3298         .con_set_origin         = fbcon_set_origin,
3299         .con_invert_region      = fbcon_invert_region,
3300         .con_screen_pos         = fbcon_screen_pos,
3301         .con_getxy              = fbcon_getxy,
3302         .con_resize             = fbcon_resize,
3303         .con_debug_enter        = fbcon_debug_enter,
3304         .con_debug_leave        = fbcon_debug_leave,
3305 };
3306
3307 static struct notifier_block fbcon_event_notifier = {
3308         .notifier_call  = fbcon_event_notify,
3309 };
3310
3311 static ssize_t store_rotate(struct device *device,
3312                             struct device_attribute *attr, const char *buf,
3313                             size_t count)
3314 {
3315         struct fb_info *info;
3316         int rotate, idx;
3317         char **last = NULL;
3318
3319         if (fbcon_has_exited)
3320                 return count;
3321
3322         console_lock();
3323         idx = con2fb_map[fg_console];
3324
3325         if (idx == -1 || registered_fb[idx] == NULL)
3326                 goto err;
3327
3328         info = registered_fb[idx];
3329         rotate = simple_strtoul(buf, last, 0);
3330         fbcon_rotate(info, rotate);
3331 err:
3332         console_unlock();
3333         return count;
3334 }
3335
3336 static ssize_t store_rotate_all(struct device *device,
3337                                 struct device_attribute *attr,const char *buf,
3338                                 size_t count)
3339 {
3340         struct fb_info *info;
3341         int rotate, idx;
3342         char **last = NULL;
3343
3344         if (fbcon_has_exited)
3345                 return count;
3346
3347         console_lock();
3348         idx = con2fb_map[fg_console];
3349
3350         if (idx == -1 || registered_fb[idx] == NULL)
3351                 goto err;
3352
3353         info = registered_fb[idx];
3354         rotate = simple_strtoul(buf, last, 0);
3355         fbcon_rotate_all(info, rotate);
3356 err:
3357         console_unlock();
3358         return count;
3359 }
3360
3361 static ssize_t show_rotate(struct device *device,
3362                            struct device_attribute *attr,char *buf)
3363 {
3364         struct fb_info *info;
3365         int rotate = 0, idx;
3366
3367         if (fbcon_has_exited)
3368                 return 0;
3369
3370         console_lock();
3371         idx = con2fb_map[fg_console];
3372
3373         if (idx == -1 || registered_fb[idx] == NULL)
3374                 goto err;
3375
3376         info = registered_fb[idx];
3377         rotate = fbcon_get_rotate(info);
3378 err:
3379         console_unlock();
3380         return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
3381 }
3382
3383 static ssize_t show_cursor_blink(struct device *device,
3384                                  struct device_attribute *attr, char *buf)
3385 {
3386         struct fb_info *info;
3387         struct fbcon_ops *ops;
3388         int idx, blink = -1;
3389
3390         if (fbcon_has_exited)
3391                 return 0;
3392
3393         console_lock();
3394         idx = con2fb_map[fg_console];
3395
3396         if (idx == -1 || registered_fb[idx] == NULL)
3397                 goto err;
3398
3399         info = registered_fb[idx];
3400         ops = info->fbcon_par;
3401
3402         if (!ops)
3403                 goto err;
3404
3405         blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0;
3406 err:
3407         console_unlock();
3408         return snprintf(buf, PAGE_SIZE, "%d\n", blink);
3409 }
3410
3411 static ssize_t store_cursor_blink(struct device *device,
3412                                   struct device_attribute *attr,
3413                                   const char *buf, size_t count)
3414 {
3415         struct fb_info *info;
3416         int blink, idx;
3417         char **last = NULL;
3418
3419         if (fbcon_has_exited)
3420                 return count;
3421
3422         console_lock();
3423         idx = con2fb_map[fg_console];
3424
3425         if (idx == -1 || registered_fb[idx] == NULL)
3426                 goto err;
3427
3428         info = registered_fb[idx];
3429
3430         if (!info->fbcon_par)
3431                 goto err;
3432
3433         blink = simple_strtoul(buf, last, 0);
3434
3435         if (blink) {
3436                 fbcon_cursor_noblink = 0;
3437                 fbcon_add_cursor_timer(info);
3438         } else {
3439                 fbcon_cursor_noblink = 1;
3440                 fbcon_del_cursor_timer(info);
3441         }
3442
3443 err:
3444         console_unlock();
3445         return count;
3446 }
3447
3448 static struct device_attribute device_attrs[] = {
3449         __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
3450         __ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
3451         __ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
3452                store_cursor_blink),
3453 };
3454
3455 static int fbcon_init_device(void)
3456 {
3457         int i, error = 0;
3458
3459         fbcon_has_sysfs = 1;
3460
3461         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3462                 error = device_create_file(fbcon_device, &device_attrs[i]);
3463
3464                 if (error)
3465                         break;
3466         }
3467
3468         if (error) {
3469                 while (--i >= 0)
3470                         device_remove_file(fbcon_device, &device_attrs[i]);
3471
3472                 fbcon_has_sysfs = 0;
3473         }
3474
3475         return 0;
3476 }
3477
3478 static void fbcon_start(void)
3479 {
3480         if (num_registered_fb) {
3481                 int i;
3482
3483                 console_lock();
3484
3485                 for (i = 0; i < FB_MAX; i++) {
3486                         if (registered_fb[i] != NULL) {
3487                                 info_idx = i;
3488                                 break;
3489                         }
3490                 }
3491
3492                 console_unlock();
3493                 fbcon_takeover(0);
3494         }
3495 }
3496
3497 static void fbcon_exit(void)
3498 {
3499         struct fb_info *info;
3500         int i, j, mapped;
3501
3502         if (fbcon_has_exited)
3503                 return;
3504
3505         kfree((void *)softback_buf);
3506         softback_buf = 0UL;
3507
3508         for (i = 0; i < FB_MAX; i++) {
3509                 int pending = 0;
3510
3511                 mapped = 0;
3512                 info = registered_fb[i];
3513
3514                 if (info == NULL)
3515                         continue;
3516
3517                 if (info->queue.func)
3518                         pending = cancel_work_sync(&info->queue);
3519                 DPRINTK("fbcon: %s pending work\n", (pending ? "canceled" :
3520                         "no"));
3521
3522                 for (j = first_fb_vc; j <= last_fb_vc; j++) {
3523                         if (con2fb_map[j] == i)
3524                                 mapped = 1;
3525                 }
3526
3527                 if (mapped) {
3528                         if (info->fbops->fb_release)
3529                                 info->fbops->fb_release(info, 0);
3530                         module_put(info->fbops->owner);
3531
3532                         if (info->fbcon_par) {
3533                                 struct fbcon_ops *ops = info->fbcon_par;
3534
3535                                 fbcon_del_cursor_timer(info);
3536                                 kfree(ops->cursor_src);
3537                                 kfree(info->fbcon_par);
3538                                 info->fbcon_par = NULL;
3539                         }
3540
3541                         if (info->queue.func == fb_flashcursor)
3542                                 info->queue.func = NULL;
3543                 }
3544         }
3545
3546         fbcon_has_exited = 1;
3547 }
3548
3549 static int __init fb_console_init(void)
3550 {
3551         int i;
3552
3553         console_lock();
3554         fb_register_client(&fbcon_event_notifier);
3555         fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
3556                                      "fbcon");
3557
3558         if (IS_ERR(fbcon_device)) {
3559                 printk(KERN_WARNING "Unable to create device "
3560                        "for fbcon; errno = %ld\n",
3561                        PTR_ERR(fbcon_device));
3562                 fbcon_device = NULL;
3563         } else
3564                 fbcon_init_device();
3565
3566         for (i = 0; i < MAX_NR_CONSOLES; i++)
3567                 con2fb_map[i] = -1;
3568
3569         console_unlock();
3570         fbcon_start();
3571         return 0;
3572 }
3573
3574 module_init(fb_console_init);
3575
3576 #ifdef MODULE
3577
3578 static void __exit fbcon_deinit_device(void)
3579 {
3580         int i;
3581
3582         if (fbcon_has_sysfs) {
3583                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3584                         device_remove_file(fbcon_device, &device_attrs[i]);
3585
3586                 fbcon_has_sysfs = 0;
3587         }
3588 }
3589
3590 static void __exit fb_console_exit(void)
3591 {
3592         console_lock();
3593         fb_unregister_client(&fbcon_event_notifier);
3594         fbcon_deinit_device();
3595         device_destroy(fb_class, MKDEV(0, 0));
3596         fbcon_exit();
3597         console_unlock();
3598         unregister_con_driver(&fb_con);
3599 }
3600
3601 module_exit(fb_console_exit);
3602
3603 #endif
3604
3605 MODULE_LICENSE("GPL");