drivers/video/console/fbcon.c

   1 /*
   2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1995 Geert Uytterhoeven
   5  *
   6  *
   7  *  This file is based on the original Amiga console driver (amicon.c):
   8  *
   9  *      Copyright (C) 1993 Hamish Macdonald
  10  *                         Greg Harp
  11  *      Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
  12  *
  13  *            with work by William Rucklidge (wjr@cs.cornell.edu)
  14  *                         Geert Uytterhoeven
  15  *                         Jes Sorensen (jds@kom.auc.dk)
  16  *                         Martin Apel
  17  *
  18  *  and on the original Atari console driver (atacon.c):
  19  *
  20  *      Copyright (C) 1993 Bjoern Brauel
  21  *                         Roman Hodek
  22  *
  23  *            with work by Guenther Kelleter
  24  *                         Martin Schaller
  25  *                         Andreas Schwab
  26  *
  27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
  28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
  29  *  and software scrollback added by
  30  *                         Jakub Jelinek (jj@ultra.linux.cz)
  31  *
  32  *  Random hacking by Martin Mares <mj@ucw.cz>
  33  *
  34  *      2001 - Documented with DocBook
  35  *      - Brad Douglas <brad@neruo.com>
  36  *
  37  *  The low level operations for the various display memory organizations are
  38  *  now in separate source files.
  39  *
  40  *  Currently the following organizations are supported:
  41  *
  42  *    o afb                     Amiga bitplanes
  43  *    o cfb{2,4,8,16,24,32}     Packed pixels
  44  *    o ilbm                    Amiga interleaved bitplanes
  45  *    o iplan2p[248]            Atari interleaved bitplanes
  46  *    o mfb                     Monochrome
  47  *    o vga                     VGA characters/attributes
  48  *
  49  *  To do:
  50  *
  51  *    - Implement 16 plane mode (iplan2p16)
  52  *
  53  *
  54  *  This file is subject to the terms and conditions of the GNU General Public
  55  *  License.  See the file COPYING in the main directory of this archive for
  56  *  more details.
  57  */
  58
  59 #undef FBCONDEBUG
  60
  61 #include <linux/module.h>
  62 #include <linux/types.h>
  63 #include <linux/fs.h>
  64 #include <linux/kernel.h>
  65 #include <linux/delay.h>        /* MSch: for IRQ probe */
  66 #include <linux/console.h>
  67 #include <linux/string.h>
  68 #include <linux/kd.h>
  69 #include <linux/slab.h>
  70 #include <linux/fb.h>
  71 #include <linux/vt_kern.h>
  72 #include <linux/selection.h>
  73 #include <linux/font.h>
  74 #include <linux/smp.h>
  75 #include <linux/init.h>
  76 #include <linux/interrupt.h>
  77 #include <linux/crc32.h> /* For counting font checksums */
  78 #include <asm/fb.h>
  79 #include <asm/irq.h>
  80
  81 #include "fbcon.h"
  82
  83 #ifdef FBCONDEBUG
  84 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __func__ , ## args)
  85 #else
  86 #  define DPRINTK(fmt, args...)
  87 #endif
  88
  89 enum {
  90         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
  91         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
  92         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
  93 };
  94
  95 static struct display fb_display[MAX_NR_CONSOLES];
  96
  97 static signed char con2fb_map[MAX_NR_CONSOLES];
  98 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
  99
 100 static int logo_lines;
 101 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 102    enums.  */
 103 static int logo_shown = FBCON_LOGO_CANSHOW;
 104 /* Software scrollback */
 105 static int fbcon_softback_size = 32768;
 106 static unsigned long softback_buf, softback_curr;
 107 static unsigned long softback_in;
 108 static unsigned long softback_top, softback_end;
 109 static int softback_lines;
 110 /* console mappings */
 111 static int first_fb_vc;
 112 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 113 static int fbcon_is_default = 1;
 114 static int fbcon_has_exited;
 115 static int primary_device = -1;
 116 static int fbcon_has_console_bind;
 117
 118 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
 119 static int map_override;
 120
 121 static inline void fbcon_map_override(void)
 122 {
 123         map_override = 1;
 124 }
 125 #else
 126 static inline void fbcon_map_override(void)
 127 {
 128 }
 129 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */
 130
 131 /* font data */
 132 static char fontname[40];
 133
 134 /* current fb_info */
 135 static int info_idx = -1;
 136
 137 /* console rotation */
 138 static int initial_rotation;
 139 static int fbcon_has_sysfs;
 140
 141 static const struct consw fb_con;
 142
 143 #define CM_SOFTBACK     (8)
 144
 145 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 146
 147 static int fbcon_set_origin(struct vc_data *);
 148
 149 static int fbcon_cursor_noblink;
 150
 151 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 152
 153 /*
 154  *  Interface used by the world
 155  */
 156
 157 static const char *fbcon_startup(void);
 158 static void fbcon_init(struct vc_data *vc, int init);
 159 static void fbcon_deinit(struct vc_data *vc);
 160 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 161                         int width);
 162 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
 163 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 164                         int count, int ypos, int xpos);
 165 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 166 static void fbcon_cursor(struct vc_data *vc, int mode);
 167 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 168                         int count);
 169 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
 170                         int height, int width);
 171 static int fbcon_switch(struct vc_data *vc);
 172 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
 173 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table);
 174
 175 /*
 176  *  Internal routines
 177  */
 178 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 179 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 180 static __inline__ void ypan_up(struct vc_data *vc, int count);
 181 static __inline__ void ypan_down(struct vc_data *vc, int count);
 182 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
 183                             int dy, int dx, int height, int width, u_int y_break);
 184 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 185                            int unit);
 186 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 187                               int line, int count, int dy);
 188 static void fbcon_modechanged(struct fb_info *info);
 189 static void fbcon_set_all_vcs(struct fb_info *info);
 190 static void fbcon_start(void);
 191 static void fbcon_exit(void);
 192 static struct device *fbcon_device;
 193
 194 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 195 static inline void fbcon_set_rotation(struct fb_info *info)
 196 {
 197         struct fbcon_ops *ops = info->fbcon_par;
 198
 199         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
 200             ops->p->con_rotate < 4)
 201                 ops->rotate = ops->p->con_rotate;
 202         else
 203                 ops->rotate = 0;
 204 }
 205
 206 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 207 {
 208         struct fbcon_ops *ops= info->fbcon_par;
 209         struct fb_info *fb_info;
 210
 211         if (!ops || ops->currcon == -1)
 212                 return;
 213
 214         fb_info = registered_fb[con2fb_map[ops->currcon]];
 215
 216         if (info == fb_info) {
 217                 struct display *p = &fb_display[ops->currcon];
 218
 219                 if (rotate < 4)
 220                         p->con_rotate = rotate;
 221                 else
 222                         p->con_rotate = 0;
 223
 224                 fbcon_modechanged(info);
 225         }
 226 }
 227
 228 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 229 {
 230         struct fbcon_ops *ops = info->fbcon_par;
 231         struct vc_data *vc;
 232         struct display *p;
 233         int i;
 234
 235         if (!ops || ops->currcon < 0 || rotate > 3)
 236                 return;
 237
 238         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 239                 vc = vc_cons[i].d;
 240                 if (!vc || vc->vc_mode != KD_TEXT ||
 241                     registered_fb[con2fb_map[i]] != info)
 242                         continue;
 243
 244                 p = &fb_display[vc->vc_num];
 245                 p->con_rotate = rotate;
 246         }
 247
 248         fbcon_set_all_vcs(info);
 249 }
 250 #else
 251 static inline void fbcon_set_rotation(struct fb_info *info)
 252 {
 253         struct fbcon_ops *ops = info->fbcon_par;
 254
 255         ops->rotate = FB_ROTATE_UR;
 256 }
 257
 258 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 259 {
 260         return;
 261 }
 262
 263 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 264 {
 265         return;
 266 }
 267 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 268
 269 static int fbcon_get_rotate(struct fb_info *info)
 270 {
 271         struct fbcon_ops *ops = info->fbcon_par;
 272
 273         return (ops) ? ops->rotate : 0;
 274 }
 275
 276 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 277 {
 278         struct fbcon_ops *ops = info->fbcon_par;
 279
 280         return (info->state != FBINFO_STATE_RUNNING ||
 281                 vc->vc_mode != KD_TEXT || ops->graphics) &&
 282                 !vt_force_oops_output(vc);
 283 }
 284
 285 static int get_color(struct vc_data *vc, struct fb_info *info,
 286               u16 c, int is_fg)
 287 {
 288         int depth = fb_get_color_depth(&info->var, &info->fix);
 289         int color = 0;
 290
 291         if (console_blanked) {
 292                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 293
 294                 c = vc->vc_video_erase_char & charmask;
 295         }
 296
 297         if (depth != 1)
 298                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 299                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 300
 301         switch (depth) {
 302         case 1:
 303         {
 304                 int col = mono_col(info);
 305                 /* 0 or 1 */
 306                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 307                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 308
 309                 if (console_blanked)
 310                         fg = bg;
 311
 312                 color = (is_fg) ? fg : bg;
 313                 break;
 314         }
 315         case 2:
 316                 /*
 317                  * Scale down 16-colors to 4 colors. Default 4-color palette
 318                  * is grayscale. However, simply dividing the values by 4
 319                  * will not work, as colors 1, 2 and 3 will be scaled-down
 320                  * to zero rendering them invisible.  So empirically convert
 321                  * colors to a sane 4-level grayscale.
 322                  */
 323                 switch (color) {
 324                 case 0:
 325                         color = 0; /* black */
 326                         break;
 327                 case 1 ... 6:
 328                         color = 2; /* white */
 329                         break;
 330                 case 7 ... 8:
 331                         color = 1; /* gray */
 332                         break;
 333                 default:
 334                         color = 3; /* intense white */
 335                         break;
 336                 }
 337                 break;
 338         case 3:
 339                 /*
 340                  * Last 8 entries of default 16-color palette is a more intense
 341                  * version of the first 8 (i.e., same chrominance, different
 342                  * luminance).
 343                  */
 344                 color &= 7;
 345                 break;
 346         }
 347
 348
 349         return color;
 350 }
 351
 352 static void fbcon_update_softback(struct vc_data *vc)
 353 {
 354         int l = fbcon_softback_size / vc->vc_size_row;
 355
 356         if (l > 5)
 357                 softback_end = softback_buf + l * vc->vc_size_row;
 358         else
 359                 /* Smaller scrollback makes no sense, and 0 would screw
 360                    the operation totally */
 361                 softback_top = 0;
 362 }
 363
 364 static void fb_flashcursor(struct work_struct *work)
 365 {
 366         struct fb_info *info = container_of(work, struct fb_info, queue);
 367         struct fbcon_ops *ops = info->fbcon_par;
 368         struct vc_data *vc = NULL;
 369         int c;
 370         int mode;
 371         int ret;
 372
 373         /* FIXME: we should sort out the unbind locking instead */
 374         /* instead we just fail to flash the cursor if we can't get
 375          * the lock instead of blocking fbcon deinit */
 376         ret = console_trylock();
 377         if (ret == 0)
 378                 return;
 379
 380         if (ops && ops->currcon != -1)
 381                 vc = vc_cons[ops->currcon].d;
 382
 383         if (!vc || !CON_IS_VISIBLE(vc) ||
 384             registered_fb[con2fb_map[vc->vc_num]] != info ||
 385             vc->vc_deccm != 1) {
 386                 console_unlock();
 387                 return;
 388         }
 389
 390         c = scr_readw((u16 *) vc->vc_pos);
 391         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 392                 CM_ERASE : CM_DRAW;
 393         ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
 394                     get_color(vc, info, c, 0));
 395         console_unlock();
 396 }
 397
 398 static void cursor_timer_handler(unsigned long dev_addr)
 399 {
 400         struct fb_info *info = (struct fb_info *) dev_addr;
 401         struct fbcon_ops *ops = info->fbcon_par;
 402
 403         queue_work(system_power_efficient_wq, &info->queue);
 404         mod_timer(&ops->cursor_timer, jiffies + ops->cur_blink_jiffies);
 405 }
 406
 407 static void fbcon_add_cursor_timer(struct fb_info *info)
 408 {
 409         struct fbcon_ops *ops = info->fbcon_par;
 410
 411         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
 412             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER) &&
 413             !fbcon_cursor_noblink) {
 414                 if (!info->queue.func)
 415                         INIT_WORK(&info->queue, fb_flashcursor);
 416
 417                 init_timer(&ops->cursor_timer);
 418                 ops->cursor_timer.function = cursor_timer_handler;
 419                 ops->cursor_timer.expires = jiffies + ops->cur_blink_jiffies;
 420                 ops->cursor_timer.data = (unsigned long ) info;
 421                 add_timer(&ops->cursor_timer);
 422                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
 423         }
 424 }
 425
 426 static void fbcon_del_cursor_timer(struct fb_info *info)
 427 {
 428         struct fbcon_ops *ops = info->fbcon_par;
 429
 430         if (info->queue.func == fb_flashcursor &&
 431             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
 432                 del_timer_sync(&ops->cursor_timer);
 433                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
 434         }
 435 }
 436
 437 #ifndef MODULE
 438 static int __init fb_console_setup(char *this_opt)
 439 {
 440         char *options;
 441         int i, j;
 442
 443         if (!this_opt || !*this_opt)
 444                 return 1;
 445
 446         while ((options = strsep(&this_opt, ",")) != NULL) {
 447                 if (!strncmp(options, "font:", 5)) {
 448                         strlcpy(fontname, options + 5, sizeof(fontname));
 449                         continue;
 450                 }
 451
 452                 if (!strncmp(options, "scrollback:", 11)) {
 453                         options += 11;
 454                         if (*options) {
 455                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
 456                                 if (*options == 'k' || *options == 'K') {
 457                                         fbcon_softback_size *= 1024;
 458                                 }
 459                         }
 460                         continue;
 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                         continue;
 476                 }
 477
 478                 if (!strncmp(options, "vc:", 3)) {
 479                         options += 3;
 480                         if (*options)
 481                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 482                         if (first_fb_vc < 0)
 483                                 first_fb_vc = 0;
 484                         if (*options++ == '-')
 485                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 486                         fbcon_is_default = 0;
 487                         continue;
 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                         continue;
 497                 }
 498         }
 499         return 1;
 500 }
 501
 502 __setup("fbcon=", fb_console_setup);
 503 #endif
 504
 505 static int search_fb_in_map(int idx)
 506 {
 507         int i, retval = 0;
 508
 509         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 510                 if (con2fb_map[i] == idx)
 511                         retval = 1;
 512         }
 513         return retval;
 514 }
 515
 516 static int search_for_mapped_con(void)
 517 {
 518         int i, retval = 0;
 519
 520         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 521                 if (con2fb_map[i] != -1)
 522                         retval = 1;
 523         }
 524         return retval;
 525 }
 526
 527 static int do_fbcon_takeover(int show_logo)
 528 {
 529         int err, i;
 530
 531         if (!num_registered_fb)
 532                 return -ENODEV;
 533
 534         if (!show_logo)
 535                 logo_shown = FBCON_LOGO_DONTSHOW;
 536
 537         for (i = first_fb_vc; i <= last_fb_vc; i++)
 538                 con2fb_map[i] = info_idx;
 539
 540         err = do_take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 541                                 fbcon_is_default);
 542
 543         if (err) {
 544                 for (i = first_fb_vc; i <= last_fb_vc; i++)
 545                         con2fb_map[i] = -1;
 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                 ops->cur_blink_jiffies = HZ / 5;
 712                 info->fbcon_par = ops;
 713
 714                 if (vc)
 715                         set_blitting_type(vc, info);
 716         }
 717
 718         if (err) {
 719                 con2fb_map[unit] = oldidx;
 720                 module_put(info->fbops->owner);
 721         }
 722
 723         return err;
 724 }
 725
 726 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 727                                   struct fb_info *newinfo, int unit,
 728                                   int oldidx, int found)
 729 {
 730         struct fbcon_ops *ops = oldinfo->fbcon_par;
 731         int err = 0, ret;
 732
 733         if (oldinfo->fbops->fb_release &&
 734             oldinfo->fbops->fb_release(oldinfo, 0)) {
 735                 con2fb_map[unit] = oldidx;
 736                 if (!found && newinfo->fbops->fb_release)
 737                         newinfo->fbops->fb_release(newinfo, 0);
 738                 if (!found)
 739                         module_put(newinfo->fbops->owner);
 740                 err = -ENODEV;
 741         }
 742
 743         if (!err) {
 744                 fbcon_del_cursor_timer(oldinfo);
 745                 kfree(ops->cursor_state.mask);
 746                 kfree(ops->cursor_data);
 747                 kfree(ops->cursor_src);
 748                 kfree(ops->fontbuffer);
 749                 kfree(oldinfo->fbcon_par);
 750                 oldinfo->fbcon_par = NULL;
 751                 module_put(oldinfo->fbops->owner);
 752                 /*
 753                   If oldinfo and newinfo are driving the same hardware,
 754                   the fb_release() method of oldinfo may attempt to
 755                   restore the hardware state.  This will leave the
 756                   newinfo in an undefined state. Thus, a call to
 757                   fb_set_par() may be needed for the newinfo.
 758                 */
 759                 if (newinfo && newinfo->fbops->fb_set_par) {
 760                         ret = newinfo->fbops->fb_set_par(newinfo);
 761
 762                         if (ret)
 763                                 printk(KERN_ERR "con2fb_release_oldinfo: "
 764                                         "detected unhandled fb_set_par error, "
 765                                         "error code %d\n", ret);
 766                 }
 767         }
 768
 769         return err;
 770 }
 771
 772 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 773                                 int unit, int show_logo)
 774 {
 775         struct fbcon_ops *ops = info->fbcon_par;
 776         int ret;
 777
 778         ops->currcon = fg_console;
 779
 780         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT)) {
 781                 ret = info->fbops->fb_set_par(info);
 782
 783                 if (ret)
 784                         printk(KERN_ERR "con2fb_init_display: detected "
 785                                 "unhandled fb_set_par error, "
 786                                 "error code %d\n", ret);
 787         }
 788
 789         ops->flags |= FBCON_FLAGS_INIT;
 790         ops->graphics = 0;
 791         fbcon_set_disp(info, &info->var, unit);
 792
 793         if (show_logo) {
 794                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 795                 struct fb_info *fg_info =
 796                         registered_fb[con2fb_map[fg_console]];
 797
 798                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 799                                    fg_vc->vc_rows, fg_vc->vc_cols,
 800                                    fg_vc->vc_rows);
 801         }
 802
 803         update_screen(vc_cons[fg_console].d);
 804 }
 805
 806 /**
 807  *      set_con2fb_map - map console to frame buffer device
 808  *      @unit: virtual console number to map
 809  *      @newidx: frame buffer index to map virtual console to
 810  *      @user: user request
 811  *
 812  *      Maps a virtual console @unit to a frame buffer device
 813  *      @newidx.
 814  *
 815  *      This should be called with the console lock held.
 816  */
 817 static int set_con2fb_map(int unit, int newidx, int user)
 818 {
 819         struct vc_data *vc = vc_cons[unit].d;
 820         int oldidx = con2fb_map[unit];
 821         struct fb_info *info = registered_fb[newidx];
 822         struct fb_info *oldinfo = NULL;
 823         int found, err = 0;
 824
 825         if (oldidx == newidx)
 826                 return 0;
 827
 828         if (!info)
 829                 return -EINVAL;
 830
 831         if (!search_for_mapped_con() || !con_is_bound(&fb_con)) {
 832                 info_idx = newidx;
 833                 return do_fbcon_takeover(0);
 834         }
 835
 836         if (oldidx != -1)
 837                 oldinfo = registered_fb[oldidx];
 838
 839         found = search_fb_in_map(newidx);
 840
 841         con2fb_map[unit] = newidx;
 842         if (!err && !found)
 843                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 844
 845
 846         /*
 847          * If old fb is not mapped to any of the consoles,
 848          * fbcon should release it.
 849          */
 850         if (!err && oldinfo && !search_fb_in_map(oldidx))
 851                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 852                                              found);
 853
 854         if (!err) {
 855                 int show_logo = (fg_console == 0 && !user &&
 856                                  logo_shown != FBCON_LOGO_DONTSHOW);
 857
 858                 if (!found)
 859                         fbcon_add_cursor_timer(info);
 860                 con2fb_map_boot[unit] = newidx;
 861                 con2fb_init_display(vc, info, unit, show_logo);
 862         }
 863
 864         if (!search_fb_in_map(info_idx))
 865                 info_idx = newidx;
 866
 867         return err;
 868 }
 869
 870 /*
 871  *  Low Level Operations
 872  */
 873 /* NOTE: fbcon cannot be __init: it may be called from do_take_over_console later */
 874 static int var_to_display(struct display *disp,
 875                           struct fb_var_screeninfo *var,
 876                           struct fb_info *info)
 877 {
 878         disp->xres_virtual = var->xres_virtual;
 879         disp->yres_virtual = var->yres_virtual;
 880         disp->bits_per_pixel = var->bits_per_pixel;
 881         disp->grayscale = var->grayscale;
 882         disp->nonstd = var->nonstd;
 883         disp->accel_flags = var->accel_flags;
 884         disp->height = var->height;
 885         disp->width = var->width;
 886         disp->red = var->red;
 887         disp->green = var->green;
 888         disp->blue = var->blue;
 889         disp->transp = var->transp;
 890         disp->rotate = var->rotate;
 891         disp->mode = fb_match_mode(var, &info->modelist);
 892         if (disp->mode == NULL)
 893                 /* This should not happen */
 894                 return -EINVAL;
 895         return 0;
 896 }
 897
 898 static void display_to_var(struct fb_var_screeninfo *var,
 899                            struct display *disp)
 900 {
 901         fb_videomode_to_var(var, disp->mode);
 902         var->xres_virtual = disp->xres_virtual;
 903         var->yres_virtual = disp->yres_virtual;
 904         var->bits_per_pixel = disp->bits_per_pixel;
 905         var->grayscale = disp->grayscale;
 906         var->nonstd = disp->nonstd;
 907         var->accel_flags = disp->accel_flags;
 908         var->height = disp->height;
 909         var->width = disp->width;
 910         var->red = disp->red;
 911         var->green = disp->green;
 912         var->blue = disp->blue;
 913         var->transp = disp->transp;
 914         var->rotate = disp->rotate;
 915 }
 916
 917 static const char *fbcon_startup(void)
 918 {
 919         const char *display_desc = "frame buffer device";
 920         struct display *p = &fb_display[fg_console];
 921         struct vc_data *vc = vc_cons[fg_console].d;
 922         const struct font_desc *font = NULL;
 923         struct module *owner;
 924         struct fb_info *info = NULL;
 925         struct fbcon_ops *ops;
 926         int rows, cols;
 927
 928         /*
 929          *  If num_registered_fb is zero, this is a call for the dummy part.
 930          *  The frame buffer devices weren't initialized yet.
 931          */
 932         if (!num_registered_fb || info_idx == -1)
 933                 return display_desc;
 934         /*
 935          * Instead of blindly using registered_fb[0], we use info_idx, set by
 936          * fb_console_init();
 937          */
 938         info = registered_fb[info_idx];
 939         if (!info)
 940                 return NULL;
 941
 942         owner = info->fbops->owner;
 943         if (!try_module_get(owner))
 944                 return NULL;
 945         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 946                 module_put(owner);
 947                 return NULL;
 948         }
 949
 950         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 951         if (!ops) {
 952                 module_put(owner);
 953                 return NULL;
 954         }
 955
 956         ops->currcon = -1;
 957         ops->graphics = 1;
 958         ops->cur_rotate = -1;
 959         ops->cur_blink_jiffies = HZ / 5;
 960         info->fbcon_par = ops;
 961         p->con_rotate = initial_rotation;
 962         set_blitting_type(vc, info);
 963
 964         if (info->fix.type != FB_TYPE_TEXT) {
 965                 if (fbcon_softback_size) {
 966                         if (!softback_buf) {
 967                                 softback_buf =
 968                                     (unsigned long)
 969                                     kmalloc(fbcon_softback_size,
 970                                             GFP_KERNEL);
 971                                 if (!softback_buf) {
 972                                         fbcon_softback_size = 0;
 973                                         softback_top = 0;
 974                                 }
 975                         }
 976                 } else {
 977                         if (softback_buf) {
 978                                 kfree((void *) softback_buf);
 979                                 softback_buf = 0;
 980                                 softback_top = 0;
 981                         }
 982                 }
 983                 if (softback_buf)
 984                         softback_in = softback_top = softback_curr =
 985                             softback_buf;
 986                 softback_lines = 0;
 987         }
 988
 989         /* Setup default font */
 990         if (!p->fontdata && !vc->vc_font.data) {
 991                 if (!fontname[0] || !(font = find_font(fontname)))
 992                         font = get_default_font(info->var.xres,
 993                                                 info->var.yres,
 994                                                 info->pixmap.blit_x,
 995                                                 info->pixmap.blit_y);
 996                 vc->vc_font.width = font->width;
 997                 vc->vc_font.height = font->height;
 998                 vc->vc_font.data = (void *)(p->fontdata = font->data);
 999                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
1000         } else {
1001                 p->fontdata = vc->vc_font.data;
1002         }
1003
1004         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1005         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1006         cols /= vc->vc_font.width;
1007         rows /= vc->vc_font.height;
1008         vc_resize(vc, cols, rows);
1009
1010         DPRINTK("mode:   %s\n", info->fix.id);
1011         DPRINTK("visual: %d\n", info->fix.visual);
1012         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
1013                 info->var.yres,
1014                 info->var.bits_per_pixel);
1015
1016         fbcon_add_cursor_timer(info);
1017         fbcon_has_exited = 0;
1018         return display_desc;
1019 }
1020
1021 static void fbcon_init(struct vc_data *vc, int init)
1022 {
1023         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1024         struct fbcon_ops *ops;
1025         struct vc_data **default_mode = vc->vc_display_fg;
1026         struct vc_data *svc = *default_mode;
1027         struct display *t, *p = &fb_display[vc->vc_num];
1028         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1029         int cap, ret;
1030
1031         if (info_idx == -1 || info == NULL)
1032             return;
1033
1034         cap = info->flags;
1035
1036         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1037             (info->fix.type == FB_TYPE_TEXT))
1038                 logo = 0;
1039
1040         if (var_to_display(p, &info->var, info))
1041                 return;
1042
1043         if (!info->fbcon_par)
1044                 con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);
1045
1046         /* If we are not the first console on this
1047            fb, copy the font from that console */
1048         t = &fb_display[fg_console];
1049         if (!p->fontdata) {
1050                 if (t->fontdata) {
1051                         struct vc_data *fvc = vc_cons[fg_console].d;
1052
1053                         vc->vc_font.data = (void *)(p->fontdata =
1054                                                     fvc->vc_font.data);
1055                         vc->vc_font.width = fvc->vc_font.width;
1056                         vc->vc_font.height = fvc->vc_font.height;
1057                         p->userfont = t->userfont;
1058
1059                         if (p->userfont)
1060                                 REFCOUNT(p->fontdata)++;
1061                 } else {
1062                         const struct font_desc *font = NULL;
1063
1064                         if (!fontname[0] || !(font = find_font(fontname)))
1065                                 font = get_default_font(info->var.xres,
1066                                                         info->var.yres,
1067                                                         info->pixmap.blit_x,
1068                                                         info->pixmap.blit_y);
1069                         vc->vc_font.width = font->width;
1070                         vc->vc_font.height = font->height;
1071                         vc->vc_font.data = (void *)(p->fontdata = font->data);
1072                         vc->vc_font.charcount = 256; /* FIXME  Need to
1073                                                         support more fonts */
1074                 }
1075         }
1076
1077         if (p->userfont)
1078                 charcnt = FNTCHARCNT(p->fontdata);
1079
1080         vc->vc_panic_force_write = !!(info->flags & FBINFO_CAN_FORCE_OUTPUT);
1081         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1082         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1083         if (charcnt == 256) {
1084                 vc->vc_hi_font_mask = 0;
1085         } else {
1086                 vc->vc_hi_font_mask = 0x100;
1087                 if (vc->vc_can_do_color)
1088                         vc->vc_complement_mask <<= 1;
1089         }
1090
1091         if (!*svc->vc_uni_pagedir_loc)
1092                 con_set_default_unimap(svc);
1093         if (!*vc->vc_uni_pagedir_loc)
1094                 con_copy_unimap(vc, svc);
1095
1096         ops = info->fbcon_par;
1097         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1098         p->con_rotate = initial_rotation;
1099         set_blitting_type(vc, info);
1100
1101         cols = vc->vc_cols;
1102         rows = vc->vc_rows;
1103         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1104         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1105         new_cols /= vc->vc_font.width;
1106         new_rows /= vc->vc_font.height;
1107
1108         /*
1109          * We must always set the mode. The mode of the previous console
1110          * driver could be in the same resolution but we are using different
1111          * hardware so we have to initialize the hardware.
1112          *
1113          * We need to do it in fbcon_init() to prevent screen corruption.
1114          */
1115         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
1116                 if (info->fbops->fb_set_par &&
1117                     !(ops->flags & FBCON_FLAGS_INIT)) {
1118                         ret = info->fbops->fb_set_par(info);
1119
1120                         if (ret)
1121                                 printk(KERN_ERR "fbcon_init: detected "
1122                                         "unhandled fb_set_par error, "
1123                                         "error code %d\n", ret);
1124                 }
1125
1126                 ops->flags |= FBCON_FLAGS_INIT;
1127         }
1128
1129         ops->graphics = 0;
1130
1131         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1132             !(cap & FBINFO_HWACCEL_DISABLED))
1133                 p->scrollmode = SCROLL_MOVE;
1134         else /* default to something safe */
1135                 p->scrollmode = SCROLL_REDRAW;
1136
1137         /*
1138          *  ++guenther: console.c:vc_allocate() relies on initializing
1139          *  vc_{cols,rows}, but we must not set those if we are only
1140          *  resizing the console.
1141          */
1142         if (init) {
1143                 vc->vc_cols = new_cols;
1144                 vc->vc_rows = new_rows;
1145         } else
1146                 vc_resize(vc, new_cols, new_rows);
1147
1148         if (logo)
1149                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1150
1151         if (vc == svc && softback_buf)
1152                 fbcon_update_softback(vc);
1153
1154         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1155                 ops->rotate = FB_ROTATE_UR;
1156                 set_blitting_type(vc, info);
1157         }
1158
1159         ops->p = &fb_display[fg_console];
1160 }
1161
1162 static void fbcon_free_font(struct display *p, bool freefont)
1163 {
1164         if (freefont && p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
1165                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
1166         p->fontdata = NULL;
1167         p->userfont = 0;
1168 }
1169
1170 static void fbcon_deinit(struct vc_data *vc)
1171 {
1172         struct display *p = &fb_display[vc->vc_num];
1173         struct fb_info *info;
1174         struct fbcon_ops *ops;
1175         int idx;
1176         bool free_font = true;
1177
1178         idx = con2fb_map[vc->vc_num];
1179
1180         if (idx == -1)
1181                 goto finished;
1182
1183         info = registered_fb[idx];
1184
1185         if (!info)
1186                 goto finished;
1187
1188         if (info->flags & FBINFO_MISC_FIRMWARE)
1189                 free_font = false;
1190         ops = info->fbcon_par;
1191
1192         if (!ops)
1193                 goto finished;
1194
1195         if (CON_IS_VISIBLE(vc))
1196                 fbcon_del_cursor_timer(info);
1197
1198         ops->flags &= ~FBCON_FLAGS_INIT;
1199 finished:
1200
1201         fbcon_free_font(p, free_font);
1202         if (free_font)
1203                 vc->vc_font.data = NULL;
1204
1205         if (!con_is_bound(&fb_con))
1206                 fbcon_exit();
1207
1208         return;
1209 }
1210
1211 /* ====================================================================== */
1212
1213 /*  fbcon_XXX routines - interface used by the world
1214  *
1215  *  This system is now divided into two levels because of complications
1216  *  caused by hardware scrolling. Top level functions:
1217  *
1218  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1219  *
1220  *  handles y values in range [0, scr_height-1] that correspond to real
1221  *  screen positions. y_wrap shift means that first line of bitmap may be
1222  *  anywhere on this display. These functions convert lineoffsets to
1223  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1224  *
1225  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1226  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1227  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1228  *
1229  *  WARNING:
1230  *
1231  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1232  *  Implies should only really hardware scroll in rows. Only reason for
1233  *  restriction is simplicity & efficiency at the moment.
1234  */
1235
1236 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1237                         int width)
1238 {
1239         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1240         struct fbcon_ops *ops = info->fbcon_par;
1241
1242         struct display *p = &fb_display[vc->vc_num];
1243         u_int y_break;
1244
1245         if (fbcon_is_inactive(vc, info))
1246                 return;
1247
1248         if (!height || !width)
1249                 return;
1250
1251         if (sy < vc->vc_top && vc->vc_top == logo_lines) {
1252                 vc->vc_top = 0;
1253                 /*
1254                  * If the font dimensions are not an integral of the display
1255                  * dimensions then the ops->clear below won't end up clearing
1256                  * the margins.  Call clear_margins here in case the logo
1257                  * bitmap stretched into the margin area.
1258                  */
1259                 fbcon_clear_margins(vc, 0);
1260         }
1261
1262         /* Split blits that cross physical y_wrap boundary */
1263
1264         y_break = p->vrows - p->yscroll;
1265         if (sy < y_break && sy + height - 1 >= y_break) {
1266                 u_int b = y_break - sy;
1267                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1268                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1269                                  width);
1270         } else
1271                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1272 }
1273
1274 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1275                         int count, int ypos, int xpos)
1276 {
1277         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1278         struct display *p = &fb_display[vc->vc_num];
1279         struct fbcon_ops *ops = info->fbcon_par;
1280
1281         if (!fbcon_is_inactive(vc, info))
1282                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1283                            get_color(vc, info, scr_readw(s), 1),
1284                            get_color(vc, info, scr_readw(s), 0));
1285 }
1286
1287 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1288 {
1289         unsigned short chr;
1290
1291         scr_writew(c, &chr);
1292         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1293 }
1294
1295 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1296 {
1297         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1298         struct fbcon_ops *ops = info->fbcon_par;
1299
1300         if (!fbcon_is_inactive(vc, info))
1301                 ops->clear_margins(vc, info, bottom_only);
1302 }
1303
1304 static void fbcon_cursor(struct vc_data *vc, int mode)
1305 {
1306         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1307         struct fbcon_ops *ops = info->fbcon_par;
1308         int y;
1309         int c = scr_readw((u16 *) vc->vc_pos);
1310
1311         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1312
1313         if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
1314                 return;
1315
1316         if (vc->vc_cursor_type & 0x10)
1317                 fbcon_del_cursor_timer(info);
1318         else
1319                 fbcon_add_cursor_timer(info);
1320
1321         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1322         if (mode & CM_SOFTBACK) {
1323                 mode &= ~CM_SOFTBACK;
1324                 y = softback_lines;
1325         } else {
1326                 if (softback_lines)
1327                         fbcon_set_origin(vc);
1328                 y = 0;
1329         }
1330
1331         ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
1332                     get_color(vc, info, c, 0));
1333 }
1334
1335 static int scrollback_phys_max = 0;
1336 static int scrollback_max = 0;
1337 static int scrollback_current = 0;
1338
1339 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1340                            int unit)
1341 {
1342         struct display *p, *t;
1343         struct vc_data **default_mode, *vc;
1344         struct vc_data *svc;
1345         struct fbcon_ops *ops = info->fbcon_par;
1346         int rows, cols, charcnt = 256;
1347
1348         p = &fb_display[unit];
1349
1350         if (var_to_display(p, var, info))
1351                 return;
1352
1353         vc = vc_cons[unit].d;
1354
1355         if (!vc)
1356                 return;
1357
1358         default_mode = vc->vc_display_fg;
1359         svc = *default_mode;
1360         t = &fb_display[svc->vc_num];
1361
1362         if (!vc->vc_font.data) {
1363                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1364                 vc->vc_font.width = (*default_mode)->vc_font.width;
1365                 vc->vc_font.height = (*default_mode)->vc_font.height;
1366                 p->userfont = t->userfont;
1367                 if (p->userfont)
1368                         REFCOUNT(p->fontdata)++;
1369         }
1370         if (p->userfont)
1371                 charcnt = FNTCHARCNT(p->fontdata);
1372
1373         var->activate = FB_ACTIVATE_NOW;
1374         info->var.activate = var->activate;
1375         var->yoffset = info->var.yoffset;
1376         var->xoffset = info->var.xoffset;
1377         fb_set_var(info, var);
1378         ops->var = info->var;
1379         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1380         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1381         if (charcnt == 256) {
1382                 vc->vc_hi_font_mask = 0;
1383         } else {
1384                 vc->vc_hi_font_mask = 0x100;
1385                 if (vc->vc_can_do_color)
1386                         vc->vc_complement_mask <<= 1;
1387         }
1388
1389         if (!*svc->vc_uni_pagedir_loc)
1390                 con_set_default_unimap(svc);
1391         if (!*vc->vc_uni_pagedir_loc)
1392                 con_copy_unimap(vc, svc);
1393
1394         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1395         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1396         cols /= vc->vc_font.width;
1397         rows /= vc->vc_font.height;
1398         vc_resize(vc, cols, rows);
1399
1400         if (CON_IS_VISIBLE(vc)) {
1401                 update_screen(vc);
1402                 if (softback_buf)
1403                         fbcon_update_softback(vc);
1404         }
1405 }
1406
1407 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1408 {
1409         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1410         struct fbcon_ops *ops = info->fbcon_par;
1411         struct display *p = &fb_display[vc->vc_num];
1412
1413         p->yscroll += count;
1414         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1415                 p->yscroll -= p->vrows;
1416         ops->var.xoffset = 0;
1417         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1418         ops->var.vmode |= FB_VMODE_YWRAP;
1419         ops->update_start(info);
1420         scrollback_max += count;
1421         if (scrollback_max > scrollback_phys_max)
1422                 scrollback_max = scrollback_phys_max;
1423         scrollback_current = 0;
1424 }
1425
1426 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1427 {
1428         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1429         struct fbcon_ops *ops = info->fbcon_par;
1430         struct display *p = &fb_display[vc->vc_num];
1431
1432         p->yscroll -= count;
1433         if (p->yscroll < 0)     /* Deal with wrap */
1434                 p->yscroll += p->vrows;
1435         ops->var.xoffset = 0;
1436         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1437         ops->var.vmode |= FB_VMODE_YWRAP;
1438         ops->update_start(info);
1439         scrollback_max -= count;
1440         if (scrollback_max < 0)
1441                 scrollback_max = 0;
1442         scrollback_current = 0;
1443 }
1444
1445 static __inline__ void ypan_up(struct vc_data *vc, int count)
1446 {
1447         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1448         struct display *p = &fb_display[vc->vc_num];
1449         struct fbcon_ops *ops = info->fbcon_par;
1450
1451         p->yscroll += count;
1452         if (p->yscroll > p->vrows - vc->vc_rows) {
1453                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1454                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1455                 p->yscroll -= p->vrows - vc->vc_rows;
1456         }
1457
1458         ops->var.xoffset = 0;
1459         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1460         ops->var.vmode &= ~FB_VMODE_YWRAP;
1461         ops->update_start(info);
1462         fbcon_clear_margins(vc, 1);
1463         scrollback_max += count;
1464         if (scrollback_max > scrollback_phys_max)
1465                 scrollback_max = scrollback_phys_max;
1466         scrollback_current = 0;
1467 }
1468
1469 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1470 {
1471         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1472         struct fbcon_ops *ops = info->fbcon_par;
1473         struct display *p = &fb_display[vc->vc_num];
1474
1475         p->yscroll += count;
1476
1477         if (p->yscroll > p->vrows - vc->vc_rows) {
1478                 p->yscroll -= p->vrows - vc->vc_rows;
1479                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1480         }
1481
1482         ops->var.xoffset = 0;
1483         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1484         ops->var.vmode &= ~FB_VMODE_YWRAP;
1485         ops->update_start(info);
1486         fbcon_clear_margins(vc, 1);
1487         scrollback_max += count;
1488         if (scrollback_max > scrollback_phys_max)
1489                 scrollback_max = scrollback_phys_max;
1490         scrollback_current = 0;
1491 }
1492
1493 static __inline__ void ypan_down(struct vc_data *vc, int count)
1494 {
1495         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1496         struct display *p = &fb_display[vc->vc_num];
1497         struct fbcon_ops *ops = info->fbcon_par;
1498
1499         p->yscroll -= count;
1500         if (p->yscroll < 0) {
1501                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1502                             0, vc->vc_rows, vc->vc_cols);
1503                 p->yscroll += p->vrows - vc->vc_rows;
1504         }
1505
1506         ops->var.xoffset = 0;
1507         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1508         ops->var.vmode &= ~FB_VMODE_YWRAP;
1509         ops->update_start(info);
1510         fbcon_clear_margins(vc, 1);
1511         scrollback_max -= count;
1512         if (scrollback_max < 0)
1513                 scrollback_max = 0;
1514         scrollback_current = 0;
1515 }
1516
1517 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1518 {
1519         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1520         struct fbcon_ops *ops = info->fbcon_par;
1521         struct display *p = &fb_display[vc->vc_num];
1522
1523         p->yscroll -= count;
1524
1525         if (p->yscroll < 0) {
1526                 p->yscroll += p->vrows - vc->vc_rows;
1527                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1528         }
1529
1530         ops->var.xoffset = 0;
1531         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1532         ops->var.vmode &= ~FB_VMODE_YWRAP;
1533         ops->update_start(info);
1534         fbcon_clear_margins(vc, 1);
1535         scrollback_max -= count;
1536         if (scrollback_max < 0)
1537                 scrollback_max = 0;
1538         scrollback_current = 0;
1539 }
1540
1541 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1542                                   long delta)
1543 {
1544         int count = vc->vc_rows;
1545         unsigned short *d, *s;
1546         unsigned long n;
1547         int line = 0;
1548
1549         d = (u16 *) softback_curr;
1550         if (d == (u16 *) softback_in)
1551                 d = (u16 *) vc->vc_origin;
1552         n = softback_curr + delta * vc->vc_size_row;
1553         softback_lines -= delta;
1554         if (delta < 0) {
1555                 if (softback_curr < softback_top && n < softback_buf) {
1556                         n += softback_end - softback_buf;
1557                         if (n < softback_top) {
1558                                 softback_lines -=
1559                                     (softback_top - n) / vc->vc_size_row;
1560                                 n = softback_top;
1561                         }
1562                 } else if (softback_curr >= softback_top
1563                            && n < softback_top) {
1564                         softback_lines -=
1565                             (softback_top - n) / vc->vc_size_row;
1566                         n = softback_top;
1567                 }
1568         } else {
1569                 if (softback_curr > softback_in && n >= softback_end) {
1570                         n += softback_buf - softback_end;
1571                         if (n > softback_in) {
1572                                 n = softback_in;
1573                                 softback_lines = 0;
1574                         }
1575                 } else if (softback_curr <= softback_in && n > softback_in) {
1576                         n = softback_in;
1577                         softback_lines = 0;
1578                 }
1579         }
1580         if (n == softback_curr)
1581                 return;
1582         softback_curr = n;
1583         s = (u16 *) softback_curr;
1584         if (s == (u16 *) softback_in)
1585                 s = (u16 *) vc->vc_origin;
1586         while (count--) {
1587                 unsigned short *start;
1588                 unsigned short *le;
1589                 unsigned short c;
1590                 int x = 0;
1591                 unsigned short attr = 1;
1592
1593                 start = s;
1594                 le = advance_row(s, 1);
1595                 do {
1596                         c = scr_readw(s);
1597                         if (attr != (c & 0xff00)) {
1598                                 attr = c & 0xff00;
1599                                 if (s > start) {
1600                                         fbcon_putcs(vc, start, s - start,
1601                                                     line, x);
1602                                         x += s - start;
1603                                         start = s;
1604                                 }
1605                         }
1606                         if (c == scr_readw(d)) {
1607                                 if (s > start) {
1608                                         fbcon_putcs(vc, start, s - start,
1609                                                     line, x);
1610                                         x += s - start + 1;
1611                                         start = s + 1;
1612                                 } else {
1613                                         x++;
1614                                         start++;
1615                                 }
1616                         }
1617                         s++;
1618                         d++;
1619                 } while (s < le);
1620                 if (s > start)
1621                         fbcon_putcs(vc, start, s - start, line, x);
1622                 line++;
1623                 if (d == (u16 *) softback_end)
1624                         d = (u16 *) softback_buf;
1625                 if (d == (u16 *) softback_in)
1626                         d = (u16 *) vc->vc_origin;
1627                 if (s == (u16 *) softback_end)
1628                         s = (u16 *) softback_buf;
1629                 if (s == (u16 *) softback_in)
1630                         s = (u16 *) vc->vc_origin;
1631         }
1632 }
1633
1634 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1635                               int line, int count, int dy)
1636 {
1637         unsigned short *s = (unsigned short *)
1638                 (vc->vc_origin + vc->vc_size_row * line);
1639
1640         while (count--) {
1641                 unsigned short *start = s;
1642                 unsigned short *le = advance_row(s, 1);
1643                 unsigned short c;
1644                 int x = 0;
1645                 unsigned short attr = 1;
1646
1647                 do {
1648                         c = scr_readw(s);
1649                         if (attr != (c & 0xff00)) {
1650                                 attr = c & 0xff00;
1651                                 if (s > start) {
1652                                         fbcon_putcs(vc, start, s - start,
1653                                                     dy, x);
1654                                         x += s - start;
1655                                         start = s;
1656                                 }
1657                         }
1658                         console_conditional_schedule();
1659                         s++;
1660                 } while (s < le);
1661                 if (s > start)
1662                         fbcon_putcs(vc, start, s - start, dy, x);
1663                 console_conditional_schedule();
1664                 dy++;
1665         }
1666 }
1667
1668 static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
1669                         struct display *p, int line, int count, int ycount)
1670 {
1671         int offset = ycount * vc->vc_cols;
1672         unsigned short *d = (unsigned short *)
1673             (vc->vc_origin + vc->vc_size_row * line);
1674         unsigned short *s = d + offset;
1675         struct fbcon_ops *ops = info->fbcon_par;
1676
1677         while (count--) {
1678                 unsigned short *start = s;
1679                 unsigned short *le = advance_row(s, 1);
1680                 unsigned short c;
1681                 int x = 0;
1682
1683                 do {
1684                         c = scr_readw(s);
1685
1686                         if (c == scr_readw(d)) {
1687                                 if (s > start) {
1688                                         ops->bmove(vc, info, line + ycount, x,
1689                                                    line, x, 1, s-start);
1690                                         x += s - start + 1;
1691                                         start = s + 1;
1692                                 } else {
1693                                         x++;
1694                                         start++;
1695                                 }
1696                         }
1697
1698                         scr_writew(c, d);
1699                         console_conditional_schedule();
1700                         s++;
1701                         d++;
1702                 } while (s < le);
1703                 if (s > start)
1704                         ops->bmove(vc, info, line + ycount, x, line, x, 1,
1705                                    s-start);
1706                 console_conditional_schedule();
1707                 if (ycount > 0)
1708                         line++;
1709                 else {
1710                         line--;
1711                         /* NOTE: We subtract two lines from these pointers */
1712                         s -= vc->vc_size_row;
1713                         d -= vc->vc_size_row;
1714                 }
1715         }
1716 }
1717
1718 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1719                          int line, int count, int offset)
1720 {
1721         unsigned short *d = (unsigned short *)
1722             (vc->vc_origin + vc->vc_size_row * line);
1723         unsigned short *s = d + offset;
1724
1725         while (count--) {
1726                 unsigned short *start = s;
1727                 unsigned short *le = advance_row(s, 1);
1728                 unsigned short c;
1729                 int x = 0;
1730                 unsigned short attr = 1;
1731
1732                 do {
1733                         c = scr_readw(s);
1734                         if (attr != (c & 0xff00)) {
1735                                 attr = c & 0xff00;
1736                                 if (s > start) {
1737                                         fbcon_putcs(vc, start, s - start,
1738                                                     line, x);
1739                                         x += s - start;
1740                                         start = s;
1741                                 }
1742                         }
1743                         if (c == scr_readw(d)) {
1744                                 if (s > start) {
1745                                         fbcon_putcs(vc, start, s - start,
1746                                                      line, x);
1747                                         x += s - start + 1;
1748                                         start = s + 1;
1749                                 } else {
1750                                         x++;
1751                                         start++;
1752                                 }
1753                         }
1754                         scr_writew(c, d);
1755                         console_conditional_schedule();
1756                         s++;
1757                         d++;
1758                 } while (s < le);
1759                 if (s > start)
1760                         fbcon_putcs(vc, start, s - start, line, x);
1761                 console_conditional_schedule();
1762                 if (offset > 0)
1763                         line++;
1764                 else {
1765                         line--;
1766                         /* NOTE: We subtract two lines from these pointers */
1767                         s -= vc->vc_size_row;
1768                         d -= vc->vc_size_row;
1769                 }
1770         }
1771 }
1772
1773 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1774                                        int count)
1775 {
1776         unsigned short *p;
1777
1778         if (vc->vc_num != fg_console)
1779                 return;
1780         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1781
1782         while (count) {
1783                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1784                 count--;
1785                 p = advance_row(p, 1);
1786                 softback_in += vc->vc_size_row;
1787                 if (softback_in == softback_end)
1788                         softback_in = softback_buf;
1789                 if (softback_in == softback_top) {
1790                         softback_top += vc->vc_size_row;
1791                         if (softback_top == softback_end)
1792                                 softback_top = softback_buf;
1793                 }
1794         }
1795         softback_curr = softback_in;
1796 }
1797
1798 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1799                         int count)
1800 {
1801         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1802         struct display *p = &fb_display[vc->vc_num];
1803         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1804
1805         if (fbcon_is_inactive(vc, info))
1806                 return -EINVAL;
1807
1808         fbcon_cursor(vc, CM_ERASE);
1809
1810         /*
1811          * ++Geert: Only use ywrap/ypan if the console is in text mode
1812          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1813          *           whole screen (prevents flicker).
1814          */
1815
1816         switch (dir) {
1817         case SM_UP:
1818                 if (count > vc->vc_rows)        /* Maximum realistic size */
1819                         count = vc->vc_rows;
1820                 if (softback_top)
1821                         fbcon_softback_note(vc, t, count);
1822                 if (logo_shown >= 0)
1823                         goto redraw_up;
1824                 switch (p->scrollmode) {
1825                 case SCROLL_MOVE:
1826                         fbcon_redraw_blit(vc, info, p, t, b - t - count,
1827                                      count);
1828                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1829                         scr_memsetw((unsigned short *) (vc->vc_origin +
1830                                                         vc->vc_size_row *
1831                                                         (b - count)),
1832                                     vc->vc_video_erase_char,
1833                                     vc->vc_size_row * count);
1834                         return 1;
1835                         break;
1836
1837                 case SCROLL_WRAP_MOVE:
1838                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1839                                 if (t > 0)
1840                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1841                                                     vc->vc_cols);
1842                                 ywrap_up(vc, count);
1843                                 if (vc->vc_rows - b > 0)
1844                                         fbcon_bmove(vc, b - count, 0, b, 0,
1845                                                     vc->vc_rows - b,
1846                                                     vc->vc_cols);
1847                         } else if (info->flags & FBINFO_READS_FAST)
1848                                 fbcon_bmove(vc, t + count, 0, t, 0,
1849                                             b - t - count, vc->vc_cols);
1850                         else
1851                                 goto redraw_up;
1852                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1853                         break;
1854
1855                 case SCROLL_PAN_REDRAW:
1856                         if ((p->yscroll + count <=
1857                              2 * (p->vrows - vc->vc_rows))
1858                             && ((!scroll_partial && (b - t == vc->vc_rows))
1859                                 || (scroll_partial
1860                                     && (b - t - count >
1861                                         3 * vc->vc_rows >> 2)))) {
1862                                 if (t > 0)
1863                                         fbcon_redraw_move(vc, p, 0, t, count);
1864                                 ypan_up_redraw(vc, t, count);
1865                                 if (vc->vc_rows - b > 0)
1866                                         fbcon_redraw_move(vc, p, b,
1867                                                           vc->vc_rows - b, b);
1868                         } else
1869                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1870                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1871                         break;
1872
1873                 case SCROLL_PAN_MOVE:
1874                         if ((p->yscroll + count <=
1875                              2 * (p->vrows - vc->vc_rows))
1876                             && ((!scroll_partial && (b - t == vc->vc_rows))
1877                                 || (scroll_partial
1878                                     && (b - t - count >
1879                                         3 * vc->vc_rows >> 2)))) {
1880                                 if (t > 0)
1881                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1882                                                     vc->vc_cols);
1883                                 ypan_up(vc, count);
1884                                 if (vc->vc_rows - b > 0)
1885                                         fbcon_bmove(vc, b - count, 0, b, 0,
1886                                                     vc->vc_rows - b,
1887                                                     vc->vc_cols);
1888                         } else if (info->flags & FBINFO_READS_FAST)
1889                                 fbcon_bmove(vc, t + count, 0, t, 0,
1890                                             b - t - count, vc->vc_cols);
1891                         else
1892                                 goto redraw_up;
1893                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1894                         break;
1895
1896                 case SCROLL_REDRAW:
1897                       redraw_up:
1898                         fbcon_redraw(vc, p, t, b - t - count,
1899                                      count * vc->vc_cols);
1900                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1901                         scr_memsetw((unsigned short *) (vc->vc_origin +
1902                                                         vc->vc_size_row *
1903                                                         (b - count)),
1904                                     vc->vc_video_erase_char,
1905                                     vc->vc_size_row * count);
1906                         return 1;
1907                 }
1908                 break;
1909
1910         case SM_DOWN:
1911                 if (count > vc->vc_rows)        /* Maximum realistic size */
1912                         count = vc->vc_rows;
1913                 if (logo_shown >= 0)
1914                         goto redraw_down;
1915                 switch (p->scrollmode) {
1916                 case SCROLL_MOVE:
1917                         fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
1918                                      -count);
1919                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1920                         scr_memsetw((unsigned short *) (vc->vc_origin +
1921                                                         vc->vc_size_row *
1922                                                         t),
1923                                     vc->vc_video_erase_char,
1924                                     vc->vc_size_row * count);
1925                         return 1;
1926                         break;
1927
1928                 case SCROLL_WRAP_MOVE:
1929                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1930                                 if (vc->vc_rows - b > 0)
1931                                         fbcon_bmove(vc, b, 0, b - count, 0,
1932                                                     vc->vc_rows - b,
1933                                                     vc->vc_cols);
1934                                 ywrap_down(vc, count);
1935                                 if (t > 0)
1936                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1937                                                     vc->vc_cols);
1938                         } else if (info->flags & FBINFO_READS_FAST)
1939                                 fbcon_bmove(vc, t, 0, t + count, 0,
1940                                             b - t - count, vc->vc_cols);
1941                         else
1942                                 goto redraw_down;
1943                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1944                         break;
1945
1946                 case SCROLL_PAN_MOVE:
1947                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1948                             && ((!scroll_partial && (b - t == vc->vc_rows))
1949                                 || (scroll_partial
1950                                     && (b - t - count >
1951                                         3 * vc->vc_rows >> 2)))) {
1952                                 if (vc->vc_rows - b > 0)
1953                                         fbcon_bmove(vc, b, 0, b - count, 0,
1954                                                     vc->vc_rows - b,
1955                                                     vc->vc_cols);
1956                                 ypan_down(vc, count);
1957                                 if (t > 0)
1958                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1959                                                     vc->vc_cols);
1960                         } else if (info->flags & FBINFO_READS_FAST)
1961                                 fbcon_bmove(vc, t, 0, t + count, 0,
1962                                             b - t - count, vc->vc_cols);
1963                         else
1964                                 goto redraw_down;
1965                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1966                         break;
1967
1968                 case SCROLL_PAN_REDRAW:
1969                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1970                             && ((!scroll_partial && (b - t == vc->vc_rows))
1971                                 || (scroll_partial
1972                                     && (b - t - count >
1973                                         3 * vc->vc_rows >> 2)))) {
1974                                 if (vc->vc_rows - b > 0)
1975                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1976                                                           b - count);
1977                                 ypan_down_redraw(vc, t, count);
1978                                 if (t > 0)
1979                                         fbcon_redraw_move(vc, p, count, t, 0);
1980                         } else
1981                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1982                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1983                         break;
1984
1985                 case SCROLL_REDRAW:
1986                       redraw_down:
1987                         fbcon_redraw(vc, p, b - 1, b - t - count,
1988                                      -count * vc->vc_cols);
1989                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1990                         scr_memsetw((unsigned short *) (vc->vc_origin +
1991                                                         vc->vc_size_row *
1992                                                         t),
1993                                     vc->vc_video_erase_char,
1994                                     vc->vc_size_row * count);
1995                         return 1;
1996                 }
1997         }
1998         return 0;
1999 }
2000
2001
2002 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
2003                         int height, int width)
2004 {
2005         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2006         struct display *p = &fb_display[vc->vc_num];
2007
2008         if (fbcon_is_inactive(vc, info))
2009                 return;
2010
2011         if (!width || !height)
2012                 return;
2013
2014         /*  Split blits that cross physical y_wrap case.
2015          *  Pathological case involves 4 blits, better to use recursive
2016          *  code rather than unrolled case
2017          *
2018          *  Recursive invocations don't need to erase the cursor over and
2019          *  over again, so we use fbcon_bmove_rec()
2020          */
2021         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
2022                         p->vrows - p->yscroll);
2023 }
2024
2025 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
2026                             int dy, int dx, int height, int width, u_int y_break)
2027 {
2028         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2029         struct fbcon_ops *ops = info->fbcon_par;
2030         u_int b;
2031
2032         if (sy < y_break && sy + height > y_break) {
2033                 b = y_break - sy;
2034                 if (dy < sy) {  /* Avoid trashing self */
2035                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2036                                         y_break);
2037                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2038                                         height - b, width, y_break);
2039                 } else {
2040                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2041                                         height - b, width, y_break);
2042                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2043                                         y_break);
2044                 }
2045                 return;
2046         }
2047
2048         if (dy < y_break && dy + height > y_break) {
2049                 b = y_break - dy;
2050                 if (dy < sy) {  /* Avoid trashing self */
2051                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2052                                         y_break);
2053                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2054                                         height - b, width, y_break);
2055                 } else {
2056                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2057                                         height - b, width, y_break);
2058                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2059                                         y_break);
2060                 }
2061                 return;
2062         }
2063         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
2064                    height, width);
2065 }
2066
2067 static void updatescrollmode(struct display *p,
2068                                         struct fb_info *info,
2069                                         struct vc_data *vc)
2070 {
2071         struct fbcon_ops *ops = info->fbcon_par;
2072         int fh = vc->vc_font.height;
2073         int cap = info->flags;
2074         u16 t = 0;
2075         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
2076                                   info->fix.xpanstep);
2077         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
2078         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2079         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
2080                                    info->var.xres_virtual);
2081         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
2082                 divides(ypan, vc->vc_font.height) && vyres > yres;
2083         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
2084                 divides(ywrap, vc->vc_font.height) &&
2085                 divides(vc->vc_font.height, vyres) &&
2086                 divides(vc->vc_font.height, yres);
2087         int reading_fast = cap & FBINFO_READS_FAST;
2088         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
2089                 !(cap & FBINFO_HWACCEL_DISABLED);
2090         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
2091                 !(cap & FBINFO_HWACCEL_DISABLED);
2092
2093         p->vrows = vyres/fh;
2094         if (yres > (fh * (vc->vc_rows + 1)))
2095                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
2096         if ((yres % fh) && (vyres % fh < yres % fh))
2097                 p->vrows--;
2098
2099         if (good_wrap || good_pan) {
2100                 if (reading_fast || fast_copyarea)
2101                         p->scrollmode = good_wrap ?
2102                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
2103                 else
2104                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
2105                                 SCROLL_PAN_REDRAW;
2106         } else {
2107                 if (reading_fast || (fast_copyarea && !fast_imageblit))
2108                         p->scrollmode = SCROLL_MOVE;
2109                 else
2110                         p->scrollmode = SCROLL_REDRAW;
2111         }
2112 }
2113
2114 static int fbcon_resize(struct vc_data *vc, unsigned int width,
2115                         unsigned int height, unsigned int user)
2116 {
2117         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2118         struct fbcon_ops *ops = info->fbcon_par;
2119         struct display *p = &fb_display[vc->vc_num];
2120         struct fb_var_screeninfo var = info->var;
2121         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2122
2123         virt_w = FBCON_SWAP(ops->rotate, width, height);
2124         virt_h = FBCON_SWAP(ops->rotate, height, width);
2125         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2126                                  vc->vc_font.height);
2127         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2128                                  vc->vc_font.width);
2129         var.xres = virt_w * virt_fw;
2130         var.yres = virt_h * virt_fh;
2131         x_diff = info->var.xres - var.xres;
2132         y_diff = info->var.yres - var.yres;
2133         if (x_diff < 0 || x_diff > virt_fw ||
2134             y_diff < 0 || y_diff > virt_fh) {
2135                 const struct fb_videomode *mode;
2136
2137                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2138                 mode = fb_find_best_mode(&var, &info->modelist);
2139                 if (mode == NULL)
2140                         return -EINVAL;
2141                 display_to_var(&var, p);
2142                 fb_videomode_to_var(&var, mode);
2143
2144                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2145                         return -EINVAL;
2146
2147                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2148                 if (CON_IS_VISIBLE(vc)) {
2149                         var.activate = FB_ACTIVATE_NOW |
2150                                 FB_ACTIVATE_FORCE;
2151                         fb_set_var(info, &var);
2152                 }
2153                 var_to_display(p, &info->var, info);
2154                 ops->var = info->var;
2155         }
2156         updatescrollmode(p, info, vc);
2157         return 0;
2158 }
2159
2160 static int fbcon_switch(struct vc_data *vc)
2161 {
2162         struct fb_info *info, *old_info = NULL;
2163         struct fbcon_ops *ops;
2164         struct display *p = &fb_display[vc->vc_num];
2165         struct fb_var_screeninfo var;
2166         int i, ret, prev_console, charcnt = 256;
2167
2168         info = registered_fb[con2fb_map[vc->vc_num]];
2169         ops = info->fbcon_par;
2170
2171         if (softback_top) {
2172                 if (softback_lines)
2173                         fbcon_set_origin(vc);
2174                 softback_top = softback_curr = softback_in = softback_buf;
2175                 softback_lines = 0;
2176                 fbcon_update_softback(vc);
2177         }
2178
2179         if (logo_shown >= 0) {
2180                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2181
2182                 if (conp2->vc_top == logo_lines
2183                     && conp2->vc_bottom == conp2->vc_rows)
2184                         conp2->vc_top = 0;
2185                 logo_shown = FBCON_LOGO_CANSHOW;
2186         }
2187
2188         prev_console = ops->currcon;
2189         if (prev_console != -1)
2190                 old_info = registered_fb[con2fb_map[prev_console]];
2191         /*
2192          * FIXME: If we have multiple fbdev's loaded, we need to
2193          * update all info->currcon.  Perhaps, we can place this
2194          * in a centralized structure, but this might break some
2195          * drivers.
2196          *
2197          * info->currcon = vc->vc_num;
2198          */
2199         for (i = 0; i < FB_MAX; i++) {
2200                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2201                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2202
2203                         o->currcon = vc->vc_num;
2204                 }
2205         }
2206         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2207         display_to_var(&var, p);
2208         var.activate = FB_ACTIVATE_NOW;
2209
2210         /*
2211          * make sure we don't unnecessarily trip the memcmp()
2212          * in fb_set_var()
2213          */
2214         info->var.activate = var.activate;
2215         var.vmode |= info->var.vmode & ~FB_VMODE_MASK;
2216         fb_set_var(info, &var);
2217         ops->var = info->var;
2218
2219         if (old_info != NULL && (old_info != info ||
2220                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2221                 if (info->fbops->fb_set_par) {
2222                         ret = info->fbops->fb_set_par(info);
2223
2224                         if (ret)
2225                                 printk(KERN_ERR "fbcon_switch: detected "
2226                                         "unhandled fb_set_par error, "
2227                                         "error code %d\n", ret);
2228                 }
2229
2230                 if (old_info != info)
2231                         fbcon_del_cursor_timer(old_info);
2232         }
2233
2234         if (fbcon_is_inactive(vc, info) ||
2235             ops->blank_state != FB_BLANK_UNBLANK)
2236                 fbcon_del_cursor_timer(info);
2237         else
2238                 fbcon_add_cursor_timer(info);
2239
2240         set_blitting_type(vc, info);
2241         ops->cursor_reset = 1;
2242
2243         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2244                 ops->rotate = FB_ROTATE_UR;
2245                 set_blitting_type(vc, info);
2246         }
2247
2248         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2249         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2250
2251         if (p->userfont)
2252                 charcnt = FNTCHARCNT(vc->vc_font.data);
2253
2254         if (charcnt > 256)
2255                 vc->vc_complement_mask <<= 1;
2256
2257         updatescrollmode(p, info, vc);
2258
2259         switch (p->scrollmode) {
2260         case SCROLL_WRAP_MOVE:
2261                 scrollback_phys_max = p->vrows - vc->vc_rows;
2262                 break;
2263         case SCROLL_PAN_MOVE:
2264         case SCROLL_PAN_REDRAW:
2265                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2266                 if (scrollback_phys_max < 0)
2267                         scrollback_phys_max = 0;
2268                 break;
2269         default:
2270                 scrollback_phys_max = 0;
2271                 break;
2272         }
2273
2274         scrollback_max = 0;
2275         scrollback_current = 0;
2276
2277         if (!fbcon_is_inactive(vc, info)) {
2278             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2279             ops->update_start(info);
2280         }
2281
2282         fbcon_set_palette(vc, color_table);
2283         fbcon_clear_margins(vc, 0);
2284
2285         if (logo_shown == FBCON_LOGO_DRAW) {
2286
2287                 logo_shown = fg_console;
2288                 /* This is protected above by initmem_freed */
2289                 fb_show_logo(info, ops->rotate);
2290                 update_region(vc,
2291                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2292                               vc->vc_size_row * (vc->vc_bottom -
2293                                                  vc->vc_top) / 2);
2294                 return 0;
2295         }
2296         return 1;
2297 }
2298
2299 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2300                                 int blank)
2301 {
2302         struct fb_event event;
2303
2304         if (blank) {
2305                 unsigned short charmask = vc->vc_hi_font_mask ?
2306                         0x1ff : 0xff;
2307                 unsigned short oldc;
2308
2309                 oldc = vc->vc_video_erase_char;
2310                 vc->vc_video_erase_char &= charmask;
2311                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2312                 vc->vc_video_erase_char = oldc;
2313         }
2314
2315
2316         if (!lock_fb_info(info))
2317                 return;
2318         event.info = info;
2319         event.data = &blank;
2320         fb_notifier_call_chain(FB_EVENT_CONBLANK, &event);
2321         unlock_fb_info(info);
2322 }
2323
2324 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2325 {
2326         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2327         struct fbcon_ops *ops = info->fbcon_par;
2328
2329         if (mode_switch) {
2330                 struct fb_var_screeninfo var = info->var;
2331
2332                 ops->graphics = 1;
2333
2334                 if (!blank) {
2335                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2336                         fb_set_var(info, &var);
2337                         ops->graphics = 0;
2338                         ops->var = info->var;
2339                 }
2340         }
2341
2342         if (!fbcon_is_inactive(vc, info)) {
2343                 if (ops->blank_state != blank) {
2344                         ops->blank_state = blank;
2345                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2346                         ops->cursor_flash = (!blank);
2347
2348                         if (!(info->flags & FBINFO_MISC_USEREVENT))
2349                                 if (fb_blank(info, blank))
2350                                         fbcon_generic_blank(vc, info, blank);
2351                 }
2352
2353                 if (!blank)
2354                         update_screen(vc);
2355         }
2356
2357         if (mode_switch || fbcon_is_inactive(vc, info) ||
2358             ops->blank_state != FB_BLANK_UNBLANK)
2359                 fbcon_del_cursor_timer(info);
2360         else
2361                 fbcon_add_cursor_timer(info);
2362
2363         return 0;
2364 }
2365
2366 static int fbcon_debug_enter(struct vc_data *vc)
2367 {
2368         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2369         struct fbcon_ops *ops = info->fbcon_par;
2370
2371         ops->save_graphics = ops->graphics;
2372         ops->graphics = 0;
2373         if (info->fbops->fb_debug_enter)
2374                 info->fbops->fb_debug_enter(info);
2375         fbcon_set_palette(vc, color_table);
2376         return 0;
2377 }
2378
2379 static int fbcon_debug_leave(struct vc_data *vc)
2380 {
2381         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2382         struct fbcon_ops *ops = info->fbcon_par;
2383
2384         ops->graphics = ops->save_graphics;
2385         if (info->fbops->fb_debug_leave)
2386                 info->fbops->fb_debug_leave(info);
2387         return 0;
2388 }
2389
2390 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2391 {
2392         u8 *fontdata = vc->vc_font.data;
2393         u8 *data = font->data;
2394         int i, j;
2395
2396         font->width = vc->vc_font.width;
2397         font->height = vc->vc_font.height;
2398         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2399         if (!font->data)
2400                 return 0;
2401
2402         if (font->width <= 8) {
2403                 j = vc->vc_font.height;
2404                 for (i = 0; i < font->charcount; i++) {
2405                         memcpy(data, fontdata, j);
2406                         memset(data + j, 0, 32 - j);
2407                         data += 32;
2408                         fontdata += j;
2409                 }
2410         } else if (font->width <= 16) {
2411                 j = vc->vc_font.height * 2;
2412                 for (i = 0; i < font->charcount; i++) {
2413                         memcpy(data, fontdata, j);
2414                         memset(data + j, 0, 64 - j);
2415                         data += 64;
2416                         fontdata += j;
2417                 }
2418         } else if (font->width <= 24) {
2419                 for (i = 0; i < font->charcount; i++) {
2420                         for (j = 0; j < vc->vc_font.height; j++) {
2421                                 *data++ = fontdata[0];
2422                                 *data++ = fontdata[1];
2423                                 *data++ = fontdata[2];
2424                                 fontdata += sizeof(u32);
2425                         }
2426                         memset(data, 0, 3 * (32 - j));
2427                         data += 3 * (32 - j);
2428                 }
2429         } else {
2430                 j = vc->vc_font.height * 4;
2431                 for (i = 0; i < font->charcount; i++) {
2432                         memcpy(data, fontdata, j);
2433                         memset(data + j, 0, 128 - j);
2434                         data += 128;
2435                         fontdata += j;
2436                 }
2437         }
2438         return 0;
2439 }
2440
2441 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2442                              const u8 * data, int userfont)
2443 {
2444         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2445         struct fbcon_ops *ops = info->fbcon_par;
2446         struct display *p = &fb_display[vc->vc_num];
2447         int resize;
2448         int cnt;
2449         char *old_data = NULL;
2450
2451         if (CON_IS_VISIBLE(vc) && softback_lines)
2452                 fbcon_set_origin(vc);
2453
2454         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2455         if (p->userfont)
2456                 old_data = vc->vc_font.data;
2457         if (userfont)
2458                 cnt = FNTCHARCNT(data);
2459         else
2460                 cnt = 256;
2461         vc->vc_font.data = (void *)(p->fontdata = data);
2462         if ((p->userfont = userfont))
2463                 REFCOUNT(data)++;
2464         vc->vc_font.width = w;
2465         vc->vc_font.height = h;
2466         if (vc->vc_hi_font_mask && cnt == 256) {
2467                 vc->vc_hi_font_mask = 0;
2468                 if (vc->vc_can_do_color) {
2469                         vc->vc_complement_mask >>= 1;
2470                         vc->vc_s_complement_mask >>= 1;
2471                 }
2472
2473                 /* ++Edmund: reorder the attribute bits */
2474                 if (vc->vc_can_do_color) {
2475                         unsigned short *cp =
2476                             (unsigned short *) vc->vc_origin;
2477                         int count = vc->vc_screenbuf_size / 2;
2478                         unsigned short c;
2479                         for (; count > 0; count--, cp++) {
2480                                 c = scr_readw(cp);
2481                                 scr_writew(((c & 0xfe00) >> 1) |
2482                                            (c & 0xff), cp);
2483                         }
2484                         c = vc->vc_video_erase_char;
2485                         vc->vc_video_erase_char =
2486                             ((c & 0xfe00) >> 1) | (c & 0xff);
2487                         vc->vc_attr >>= 1;
2488                 }
2489         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2490                 vc->vc_hi_font_mask = 0x100;
2491                 if (vc->vc_can_do_color) {
2492                         vc->vc_complement_mask <<= 1;
2493                         vc->vc_s_complement_mask <<= 1;
2494                 }
2495
2496                 /* ++Edmund: reorder the attribute bits */
2497                 {
2498                         unsigned short *cp =
2499                             (unsigned short *) vc->vc_origin;
2500                         int count = vc->vc_screenbuf_size / 2;
2501                         unsigned short c;
2502                         for (; count > 0; count--, cp++) {
2503                                 unsigned short newc;
2504                                 c = scr_readw(cp);
2505                                 if (vc->vc_can_do_color)
2506                                         newc =
2507                                             ((c & 0xff00) << 1) | (c &
2508                                                                    0xff);
2509                                 else
2510                                         newc = c & ~0x100;
2511                                 scr_writew(newc, cp);
2512                         }
2513                         c = vc->vc_video_erase_char;
2514                         if (vc->vc_can_do_color) {
2515                                 vc->vc_video_erase_char =
2516                                     ((c & 0xff00) << 1) | (c & 0xff);
2517                                 vc->vc_attr <<= 1;
2518                         } else
2519                                 vc->vc_video_erase_char = c & ~0x100;
2520                 }
2521
2522         }
2523
2524         if (resize) {
2525                 int cols, rows;
2526
2527                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2528                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2529                 cols /= w;
2530                 rows /= h;
2531                 vc_resize(vc, cols, rows);
2532                 if (CON_IS_VISIBLE(vc) && softback_buf)
2533                         fbcon_update_softback(vc);
2534         } else if (CON_IS_VISIBLE(vc)
2535                    && vc->vc_mode == KD_TEXT) {
2536                 fbcon_clear_margins(vc, 0);
2537                 update_screen(vc);
2538         }
2539
2540         if (old_data && (--REFCOUNT(old_data) == 0))
2541                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2542         return 0;
2543 }
2544
2545 static int fbcon_copy_font(struct vc_data *vc, int con)
2546 {
2547         struct display *od = &fb_display[con];
2548         struct console_font *f = &vc->vc_font;
2549
2550         if (od->fontdata == f->data)
2551                 return 0;       /* already the same font... */
2552         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2553 }
2554
2555 /*
2556  *  User asked to set font; we are guaranteed that
2557  *      a) width and height are in range 1..32
2558  *      b) charcount does not exceed 512
2559  *  but lets not assume that, since someone might someday want to use larger
2560  *  fonts. And charcount of 512 is small for unicode support.
2561  *
2562  *  However, user space gives the font in 32 rows , regardless of
2563  *  actual font height. So a new API is needed if support for larger fonts
2564  *  is ever implemented.
2565  */
2566
2567 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2568 {
2569         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2570         unsigned charcount = font->charcount;
2571         int w = font->width;
2572         int h = font->height;
2573         int size;
2574         int i, csum;
2575         u8 *new_data, *data = font->data;
2576         int pitch = (font->width+7) >> 3;
2577
2578         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2579          * If not this check should be changed to charcount < 256 */
2580         if (charcount != 256 && charcount != 512)
2581                 return -EINVAL;
2582
2583         /* Make sure drawing engine can handle the font */
2584         if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
2585             !(info->pixmap.blit_y & (1 << (font->height - 1))))
2586                 return -EINVAL;
2587
2588         /* Make sure driver can handle the font length */
2589         if (fbcon_invalid_charcount(info, charcount))
2590                 return -EINVAL;
2591
2592         size = h * pitch * charcount;
2593
2594         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2595
2596         if (!new_data)
2597                 return -ENOMEM;
2598
2599         new_data += FONT_EXTRA_WORDS * sizeof(int);
2600         FNTSIZE(new_data) = size;
2601         FNTCHARCNT(new_data) = charcount;
2602         REFCOUNT(new_data) = 0; /* usage counter */
2603         for (i=0; i< charcount; i++) {
2604                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2605         }
2606
2607         /* Since linux has a nice crc32 function use it for counting font
2608          * checksums. */
2609         csum = crc32(0, new_data, size);
2610
2611         FNTSUM(new_data) = csum;
2612         /* Check if the same font is on some other console already */
2613         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2614                 struct vc_data *tmp = vc_cons[i].d;
2615
2616                 if (fb_display[i].userfont &&
2617                     fb_display[i].fontdata &&
2618                     FNTSUM(fb_display[i].fontdata) == csum &&
2619                     FNTSIZE(fb_display[i].fontdata) == size &&
2620                     tmp->vc_font.width == w &&
2621                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2622                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2623                         new_data = (u8 *)fb_display[i].fontdata;
2624                         break;
2625                 }
2626         }
2627         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2628 }
2629
2630 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2631 {
2632         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2633         const struct font_desc *f;
2634
2635         if (!name)
2636                 f = get_default_font(info->var.xres, info->var.yres,
2637                                      info->pixmap.blit_x, info->pixmap.blit_y);
2638         else if (!(f = find_font(name)))
2639                 return -ENOENT;
2640
2641         font->width = f->width;
2642         font->height = f->height;
2643         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2644 }
2645
2646 static u16 palette_red[16];
2647 static u16 palette_green[16];
2648 static u16 palette_blue[16];
2649
2650 static struct fb_cmap palette_cmap = {
2651         0, 16, palette_red, palette_green, palette_blue, NULL
2652 };
2653
2654 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table)
2655 {
2656         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2657         int i, j, k, depth;
2658         u8 val;
2659
2660         if (fbcon_is_inactive(vc, info))
2661                 return;
2662
2663         if (!CON_IS_VISIBLE(vc))
2664                 return;
2665
2666         depth = fb_get_color_depth(&info->var, &info->fix);
2667         if (depth > 3) {
2668                 for (i = j = 0; i < 16; i++) {
2669                         k = table[i];
2670                         val = vc->vc_palette[j++];
2671                         palette_red[k] = (val << 8) | val;
2672                         val = vc->vc_palette[j++];
2673                         palette_green[k] = (val << 8) | val;
2674                         val = vc->vc_palette[j++];
2675                         palette_blue[k] = (val << 8) | val;
2676                 }
2677                 palette_cmap.len = 16;
2678                 palette_cmap.start = 0;
2679         /*
2680          * If framebuffer is capable of less than 16 colors,
2681          * use default palette of fbcon.
2682          */
2683         } else
2684                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2685
2686         fb_set_cmap(&palette_cmap, info);
2687 }
2688
2689 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2690 {
2691         unsigned long p;
2692         int line;
2693
2694         if (vc->vc_num != fg_console || !softback_lines)
2695                 return (u16 *) (vc->vc_origin + offset);
2696         line = offset / vc->vc_size_row;
2697         if (line >= softback_lines)
2698                 return (u16 *) (vc->vc_origin + offset -
2699                                 softback_lines * vc->vc_size_row);
2700         p = softback_curr + offset;
2701         if (p >= softback_end)
2702                 p += softback_buf - softback_end;
2703         return (u16 *) p;
2704 }
2705
2706 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2707                                  int *px, int *py)
2708 {
2709         unsigned long ret;
2710         int x, y;
2711
2712         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2713                 unsigned long offset = (pos - vc->vc_origin) / 2;
2714
2715                 x = offset % vc->vc_cols;
2716                 y = offset / vc->vc_cols;
2717                 if (vc->vc_num == fg_console)
2718                         y += softback_lines;
2719                 ret = pos + (vc->vc_cols - x) * 2;
2720         } else if (vc->vc_num == fg_console && softback_lines) {
2721                 unsigned long offset = pos - softback_curr;
2722
2723                 if (pos < softback_curr)
2724                         offset += softback_end - softback_buf;
2725                 offset /= 2;
2726                 x = offset % vc->vc_cols;
2727                 y = offset / vc->vc_cols;
2728                 ret = pos + (vc->vc_cols - x) * 2;
2729                 if (ret == softback_end)
2730                         ret = softback_buf;
2731                 if (ret == softback_in)
2732                         ret = vc->vc_origin;
2733         } else {
2734                 /* Should not happen */
2735                 x = y = 0;
2736                 ret = vc->vc_origin;
2737         }
2738         if (px)
2739                 *px = x;
2740         if (py)
2741                 *py = y;
2742         return ret;
2743 }
2744
2745 /* As we might be inside of softback, we may work with non-contiguous buffer,
2746    that's why we have to use a separate routine. */
2747 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2748 {
2749         while (cnt--) {
2750                 u16 a = scr_readw(p);
2751                 if (!vc->vc_can_do_color)
2752                         a ^= 0x0800;
2753                 else if (vc->vc_hi_font_mask == 0x100)
2754                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2755                             (((a) & 0x0e00) << 4);
2756                 else
2757                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2758                             (((a) & 0x0700) << 4);
2759                 scr_writew(a, p++);
2760                 if (p == (u16 *) softback_end)
2761                         p = (u16 *) softback_buf;
2762                 if (p == (u16 *) softback_in)
2763                         p = (u16 *) vc->vc_origin;
2764         }
2765 }
2766
2767 static void fbcon_scrolldelta(struct vc_data *vc, int lines)
2768 {
2769         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2770         struct fbcon_ops *ops = info->fbcon_par;
2771         struct display *disp = &fb_display[fg_console];
2772         int offset, limit, scrollback_old;
2773
2774         if (softback_top) {
2775                 if (vc->vc_num != fg_console)
2776                         return;
2777                 if (vc->vc_mode != KD_TEXT || !lines)
2778                         return;
2779                 if (logo_shown >= 0) {
2780                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2781
2782                         if (conp2->vc_top == logo_lines
2783                             && conp2->vc_bottom == conp2->vc_rows)
2784                                 conp2->vc_top = 0;
2785                         if (logo_shown == vc->vc_num) {
2786                                 unsigned long p, q;
2787                                 int i;
2788
2789                                 p = softback_in;
2790                                 q = vc->vc_origin +
2791                                     logo_lines * vc->vc_size_row;
2792                                 for (i = 0; i < logo_lines; i++) {
2793                                         if (p == softback_top)
2794                                                 break;
2795                                         if (p == softback_buf)
2796                                                 p = softback_end;
2797                                         p -= vc->vc_size_row;
2798                                         q -= vc->vc_size_row;
2799                                         scr_memcpyw((u16 *) q, (u16 *) p,
2800                                                     vc->vc_size_row);
2801                                 }
2802                                 softback_in = softback_curr = p;
2803                                 update_region(vc, vc->vc_origin,
2804                                               logo_lines * vc->vc_cols);
2805                         }
2806                         logo_shown = FBCON_LOGO_CANSHOW;
2807                 }
2808                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2809                 fbcon_redraw_softback(vc, disp, lines);
2810                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2811                 return;
2812         }
2813
2814         if (!scrollback_phys_max)
2815                 return;
2816
2817         scrollback_old = scrollback_current;
2818         scrollback_current -= lines;
2819         if (scrollback_current < 0)
2820                 scrollback_current = 0;
2821         else if (scrollback_current > scrollback_max)
2822                 scrollback_current = scrollback_max;
2823         if (scrollback_current == scrollback_old)
2824                 return;
2825
2826         if (fbcon_is_inactive(vc, info))
2827                 return;
2828
2829         fbcon_cursor(vc, CM_ERASE);
2830
2831         offset = disp->yscroll - scrollback_current;
2832         limit = disp->vrows;
2833         switch (disp->scrollmode) {
2834         case SCROLL_WRAP_MOVE:
2835                 info->var.vmode |= FB_VMODE_YWRAP;
2836                 break;
2837         case SCROLL_PAN_MOVE:
2838         case SCROLL_PAN_REDRAW:
2839                 limit -= vc->vc_rows;
2840                 info->var.vmode &= ~FB_VMODE_YWRAP;
2841                 break;
2842         }
2843         if (offset < 0)
2844                 offset += limit;
2845         else if (offset >= limit)
2846                 offset -= limit;
2847
2848         ops->var.xoffset = 0;
2849         ops->var.yoffset = offset * vc->vc_font.height;
2850         ops->update_start(info);
2851
2852         if (!scrollback_current)
2853                 fbcon_cursor(vc, CM_DRAW);
2854 }
2855
2856 static int fbcon_set_origin(struct vc_data *vc)
2857 {
2858         if (softback_lines)
2859                 fbcon_scrolldelta(vc, softback_lines);
2860         return 0;
2861 }
2862
2863 static void fbcon_suspended(struct fb_info *info)
2864 {
2865         struct vc_data *vc = NULL;
2866         struct fbcon_ops *ops = info->fbcon_par;
2867
2868         if (!ops || ops->currcon < 0)
2869                 return;
2870         vc = vc_cons[ops->currcon].d;
2871
2872         /* Clear cursor, restore saved data */
2873         fbcon_cursor(vc, CM_ERASE);
2874 }
2875
2876 static void fbcon_resumed(struct fb_info *info)
2877 {
2878         struct vc_data *vc;
2879         struct fbcon_ops *ops = info->fbcon_par;
2880
2881         if (!ops || ops->currcon < 0)
2882                 return;
2883         vc = vc_cons[ops->currcon].d;
2884
2885         update_screen(vc);
2886 }
2887
2888 static void fbcon_modechanged(struct fb_info *info)
2889 {
2890         struct fbcon_ops *ops = info->fbcon_par;
2891         struct vc_data *vc;
2892         struct display *p;
2893         int rows, cols;
2894
2895         if (!ops || ops->currcon < 0)
2896                 return;
2897         vc = vc_cons[ops->currcon].d;
2898         if (vc->vc_mode != KD_TEXT ||
2899             registered_fb[con2fb_map[ops->currcon]] != info)
2900                 return;
2901
2902         p = &fb_display[vc->vc_num];
2903         set_blitting_type(vc, info);
2904
2905         if (CON_IS_VISIBLE(vc)) {
2906                 var_to_display(p, &info->var, info);
2907                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2908                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2909                 cols /= vc->vc_font.width;
2910                 rows /= vc->vc_font.height;
2911                 vc_resize(vc, cols, rows);
2912                 updatescrollmode(p, info, vc);
2913                 scrollback_max = 0;
2914                 scrollback_current = 0;
2915
2916                 if (!fbcon_is_inactive(vc, info)) {
2917                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2918                     ops->update_start(info);
2919                 }
2920
2921                 fbcon_set_palette(vc, color_table);
2922                 update_screen(vc);
2923                 if (softback_buf)
2924                         fbcon_update_softback(vc);
2925         }
2926 }
2927
2928 static void fbcon_set_all_vcs(struct fb_info *info)
2929 {
2930         struct fbcon_ops *ops = info->fbcon_par;
2931         struct vc_data *vc;
2932         struct display *p;
2933         int i, rows, cols, fg = -1;
2934
2935         if (!ops || ops->currcon < 0)
2936                 return;
2937
2938         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2939                 vc = vc_cons[i].d;
2940                 if (!vc || vc->vc_mode != KD_TEXT ||
2941                     registered_fb[con2fb_map[i]] != info)
2942                         continue;
2943
2944                 if (CON_IS_VISIBLE(vc)) {
2945                         fg = i;
2946                         continue;
2947                 }
2948
2949                 p = &fb_display[vc->vc_num];
2950                 set_blitting_type(vc, info);
2951                 var_to_display(p, &info->var, info);
2952                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2953                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2954                 cols /= vc->vc_font.width;
2955                 rows /= vc->vc_font.height;
2956                 vc_resize(vc, cols, rows);
2957         }
2958
2959         if (fg != -1)
2960                 fbcon_modechanged(info);
2961 }
2962
2963 static int fbcon_mode_deleted(struct fb_info *info,
2964                               struct fb_videomode *mode)
2965 {
2966         struct fb_info *fb_info;
2967         struct display *p;
2968         int i, j, found = 0;
2969
2970         /* before deletion, ensure that mode is not in use */
2971         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2972                 j = con2fb_map[i];
2973                 if (j == -1)
2974                         continue;
2975                 fb_info = registered_fb[j];
2976                 if (fb_info != info)
2977                         continue;
2978                 p = &fb_display[i];
2979                 if (!p || !p->mode)
2980                         continue;
2981                 if (fb_mode_is_equal(p->mode, mode)) {
2982                         found = 1;
2983                         break;
2984                 }
2985         }
2986         return found;
2987 }
2988
2989 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2990 static int fbcon_unbind(void)
2991 {
2992         int ret;
2993
2994         ret = do_unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
2995                                 fbcon_is_default);
2996
2997         if (!ret)
2998                 fbcon_has_console_bind = 0;
2999
3000         return ret;
3001 }
3002 #else
3003 static inline int fbcon_unbind(void)
3004 {
3005         return -EINVAL;
3006 }
3007 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3008
3009 /* called with console_lock held */
3010 static int fbcon_fb_unbind(int idx)
3011 {
3012         int i, new_idx = -1, ret = 0;
3013
3014         if (!fbcon_has_console_bind)
3015                 return 0;
3016
3017         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3018                 if (con2fb_map[i] != idx &&
3019                     con2fb_map[i] != -1) {
3020                         new_idx = i;
3021                         break;
3022                 }
3023         }
3024
3025         if (new_idx != -1) {
3026                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3027                         if (con2fb_map[i] == idx)
3028                                 set_con2fb_map(i, new_idx, 0);
3029                 }
3030         } else {
3031                 struct fb_info *info = registered_fb[idx];
3032
3033                 /* This is sort of like set_con2fb_map, except it maps
3034                  * the consoles to no device and then releases the
3035                  * oldinfo to free memory and cancel the cursor blink
3036                  * timer. I can imagine this just becoming part of
3037                  * set_con2fb_map where new_idx is -1
3038                  */
3039                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3040                         if (con2fb_map[i] == idx) {
3041                                 con2fb_map[i] = -1;
3042                                 if (!search_fb_in_map(idx)) {
3043                                         ret = con2fb_release_oldinfo(vc_cons[i].d,
3044                                                                      info, NULL, i,
3045                                                                      idx, 0);
3046                                         if (ret) {
3047                                                 con2fb_map[i] = idx;
3048                                                 return ret;
3049                                         }
3050                                 }
3051                         }
3052                 }
3053                 ret = fbcon_unbind();
3054         }
3055
3056         return ret;
3057 }
3058
3059 /* called with console_lock held */
3060 static int fbcon_fb_unregistered(struct fb_info *info)
3061 {
3062         int i, idx;
3063
3064         idx = info->node;
3065         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3066                 if (con2fb_map[i] == idx)
3067                         con2fb_map[i] = -1;
3068         }
3069
3070         if (idx == info_idx) {
3071                 info_idx = -1;
3072
3073                 for (i = 0; i < FB_MAX; i++) {
3074                         if (registered_fb[i] != NULL) {
3075                                 info_idx = i;
3076                                 break;
3077                         }
3078                 }
3079         }
3080
3081         if (info_idx != -1) {
3082                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3083                         if (con2fb_map[i] == -1)
3084                                 con2fb_map[i] = info_idx;
3085                 }
3086         }
3087
3088         if (primary_device == idx)
3089                 primary_device = -1;
3090
3091         if (!num_registered_fb)
3092                 do_unregister_con_driver(&fb_con);
3093
3094         return 0;
3095 }
3096
3097 /* called with console_lock held */
3098 static void fbcon_remap_all(int idx)
3099 {
3100         int i;
3101         for (i = first_fb_vc; i <= last_fb_vc; i++)
3102                 set_con2fb_map(i, idx, 0);
3103
3104         if (con_is_bound(&fb_con)) {
3105                 printk(KERN_INFO "fbcon: Remapping primary device, "
3106                        "fb%i, to tty %i-%i\n", idx,
3107                        first_fb_vc + 1, last_fb_vc + 1);
3108                 info_idx = idx;
3109         }
3110 }
3111
3112 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
3113 static void fbcon_select_primary(struct fb_info *info)
3114 {
3115         if (!map_override && primary_device == -1 &&
3116             fb_is_primary_device(info)) {
3117                 int i;
3118
3119                 printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
3120                        info->fix.id, info->node);
3121                 primary_device = info->node;
3122
3123                 for (i = first_fb_vc; i <= last_fb_vc; i++)
3124                         con2fb_map_boot[i] = primary_device;
3125
3126                 if (con_is_bound(&fb_con)) {
3127                         printk(KERN_INFO "fbcon: Remapping primary device, "
3128                                "fb%i, to tty %i-%i\n", info->node,
3129                                first_fb_vc + 1, last_fb_vc + 1);
3130                         info_idx = primary_device;
3131                 }
3132         }
3133
3134 }
3135 #else
3136 static inline void fbcon_select_primary(struct fb_info *info)
3137 {
3138         return;
3139 }
3140 #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
3141
3142 /* called with console_lock held */
3143 static int fbcon_fb_registered(struct fb_info *info)
3144 {
3145         int ret = 0, i, idx;
3146
3147         idx = info->node;
3148         fbcon_select_primary(info);
3149
3150         if (info_idx == -1) {
3151                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3152                         if (con2fb_map_boot[i] == idx) {
3153                                 info_idx = idx;
3154                                 break;
3155                         }
3156                 }
3157
3158                 if (info_idx != -1)
3159                         ret = do_fbcon_takeover(1);
3160         } else {
3161                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3162                         if (con2fb_map_boot[i] == idx)
3163                                 set_con2fb_map(i, idx, 0);
3164                 }
3165         }
3166
3167         return ret;
3168 }
3169
3170 static void fbcon_fb_blanked(struct fb_info *info, int blank)
3171 {
3172         struct fbcon_ops *ops = info->fbcon_par;
3173         struct vc_data *vc;
3174
3175         if (!ops || ops->currcon < 0)
3176                 return;
3177
3178         vc = vc_cons[ops->currcon].d;
3179         if (vc->vc_mode != KD_TEXT ||
3180                         registered_fb[con2fb_map[ops->currcon]] != info)
3181                 return;
3182
3183         if (CON_IS_VISIBLE(vc)) {
3184                 if (blank)
3185                         do_blank_screen(0);
3186                 else
3187                         do_unblank_screen(0);
3188         }
3189         ops->blank_state = blank;
3190 }
3191
3192 static void fbcon_new_modelist(struct fb_info *info)
3193 {
3194         int i;
3195         struct vc_data *vc;
3196         struct fb_var_screeninfo var;
3197         const struct fb_videomode *mode;
3198
3199         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3200                 if (registered_fb[con2fb_map[i]] != info)
3201                         continue;
3202                 if (!fb_display[i].mode)
3203                         continue;
3204                 vc = vc_cons[i].d;
3205                 display_to_var(&var, &fb_display[i]);
3206                 mode = fb_find_nearest_mode(fb_display[i].mode,
3207                                             &info->modelist);
3208                 fb_videomode_to_var(&var, mode);
3209                 fbcon_set_disp(info, &var, vc->vc_num);
3210         }
3211 }
3212
3213 static void fbcon_get_requirement(struct fb_info *info,
3214                                   struct fb_blit_caps *caps)
3215 {
3216         struct vc_data *vc;
3217         struct display *p;
3218
3219         if (caps->flags) {
3220                 int i, charcnt;
3221
3222                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3223                         vc = vc_cons[i].d;
3224                         if (vc && vc->vc_mode == KD_TEXT &&
3225                             info->node == con2fb_map[i]) {
3226                                 p = &fb_display[i];
3227                                 caps->x |= 1 << (vc->vc_font.width - 1);
3228                                 caps->y |= 1 << (vc->vc_font.height - 1);
3229                                 charcnt = (p->userfont) ?
3230                                         FNTCHARCNT(p->fontdata) : 256;
3231                                 if (caps->len < charcnt)
3232                                         caps->len = charcnt;
3233                         }
3234                 }
3235         } else {
3236                 vc = vc_cons[fg_console].d;
3237
3238                 if (vc && vc->vc_mode == KD_TEXT &&
3239                     info->node == con2fb_map[fg_console]) {
3240                         p = &fb_display[fg_console];
3241                         caps->x = 1 << (vc->vc_font.width - 1);
3242                         caps->y = 1 << (vc->vc_font.height - 1);
3243                         caps->len = (p->userfont) ?
3244                                 FNTCHARCNT(p->fontdata) : 256;
3245                 }
3246         }
3247 }
3248
3249 static int fbcon_event_notify(struct notifier_block *self,
3250                               unsigned long action, void *data)
3251 {
3252         struct fb_event *event = data;
3253         struct fb_info *info = event->info;
3254         struct fb_videomode *mode;
3255         struct fb_con2fbmap *con2fb;
3256         struct fb_blit_caps *caps;
3257         int idx, ret = 0;
3258
3259         /*
3260          * ignore all events except driver registration and deregistration
3261          * if fbcon is not active
3262          */
3263         if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
3264                                   action == FB_EVENT_FB_UNREGISTERED))
3265                 goto done;
3266
3267         switch(action) {
3268         case FB_EVENT_SUSPEND:
3269                 fbcon_suspended(info);
3270                 break;
3271         case FB_EVENT_RESUME:
3272                 fbcon_resumed(info);
3273                 break;
3274         case FB_EVENT_MODE_CHANGE:
3275                 fbcon_modechanged(info);
3276                 break;
3277         case FB_EVENT_MODE_CHANGE_ALL:
3278                 fbcon_set_all_vcs(info);
3279                 break;
3280         case FB_EVENT_MODE_DELETE:
3281                 mode = event->data;
3282                 ret = fbcon_mode_deleted(info, mode);
3283                 break;
3284         case FB_EVENT_FB_UNBIND:
3285                 idx = info->node;
3286                 ret = fbcon_fb_unbind(idx);
3287                 break;
3288         case FB_EVENT_FB_REGISTERED:
3289                 ret = fbcon_fb_registered(info);
3290                 break;
3291         case FB_EVENT_FB_UNREGISTERED:
3292                 ret = fbcon_fb_unregistered(info);
3293                 break;
3294         case FB_EVENT_SET_CONSOLE_MAP:
3295                 /* called with console lock held */
3296                 con2fb = event->data;
3297                 ret = set_con2fb_map(con2fb->console - 1,
3298                                      con2fb->framebuffer, 1);
3299                 break;
3300         case FB_EVENT_GET_CONSOLE_MAP:
3301                 con2fb = event->data;
3302                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
3303                 break;
3304         case FB_EVENT_BLANK:
3305                 fbcon_fb_blanked(info, *(int *)event->data);
3306                 break;
3307         case FB_EVENT_NEW_MODELIST:
3308                 fbcon_new_modelist(info);
3309                 break;
3310         case FB_EVENT_GET_REQ:
3311                 caps = event->data;
3312                 fbcon_get_requirement(info, caps);
3313                 break;
3314         case FB_EVENT_REMAP_ALL_CONSOLE:
3315                 idx = info->node;
3316                 fbcon_remap_all(idx);
3317                 break;
3318         }
3319 done:
3320         return ret;
3321 }
3322
3323 /*
3324  *  The console `switch' structure for the frame buffer based console
3325  */
3326
3327 static const struct consw fb_con = {
3328         .owner                  = THIS_MODULE,
3329         .con_startup            = fbcon_startup,
3330         .con_init               = fbcon_init,
3331         .con_deinit             = fbcon_deinit,
3332         .con_clear              = fbcon_clear,
3333         .con_putc               = fbcon_putc,
3334         .con_putcs              = fbcon_putcs,
3335         .con_cursor             = fbcon_cursor,
3336         .con_scroll             = fbcon_scroll,
3337         .con_switch             = fbcon_switch,
3338         .con_blank              = fbcon_blank,
3339         .con_font_set           = fbcon_set_font,
3340         .con_font_get           = fbcon_get_font,
3341         .con_font_default       = fbcon_set_def_font,
3342         .con_font_copy          = fbcon_copy_font,
3343         .con_set_palette        = fbcon_set_palette,
3344         .con_scrolldelta        = fbcon_scrolldelta,
3345         .con_set_origin         = fbcon_set_origin,
3346         .con_invert_region      = fbcon_invert_region,
3347         .con_screen_pos         = fbcon_screen_pos,
3348         .con_getxy              = fbcon_getxy,
3349         .con_resize             = fbcon_resize,
3350         .con_debug_enter        = fbcon_debug_enter,
3351         .con_debug_leave        = fbcon_debug_leave,
3352 };
3353
3354 static struct notifier_block fbcon_event_notifier = {
3355         .notifier_call  = fbcon_event_notify,
3356 };
3357
3358 static ssize_t store_rotate(struct device *device,
3359                             struct device_attribute *attr, const char *buf,
3360                             size_t count)
3361 {
3362         struct fb_info *info;
3363         int rotate, idx;
3364         char **last = NULL;
3365
3366         if (fbcon_has_exited)
3367                 return count;
3368
3369         console_lock();
3370         idx = con2fb_map[fg_console];
3371
3372         if (idx == -1 || registered_fb[idx] == NULL)
3373                 goto err;
3374
3375         info = registered_fb[idx];
3376         rotate = simple_strtoul(buf, last, 0);
3377         fbcon_rotate(info, rotate);
3378 err:
3379         console_unlock();
3380         return count;
3381 }
3382
3383 static ssize_t store_rotate_all(struct device *device,
3384                                 struct device_attribute *attr,const char *buf,
3385                                 size_t count)
3386 {
3387         struct fb_info *info;
3388         int rotate, idx;
3389         char **last = NULL;
3390
3391         if (fbcon_has_exited)
3392                 return count;
3393
3394         console_lock();
3395         idx = con2fb_map[fg_console];
3396
3397         if (idx == -1 || registered_fb[idx] == NULL)
3398                 goto err;
3399
3400         info = registered_fb[idx];
3401         rotate = simple_strtoul(buf, last, 0);
3402         fbcon_rotate_all(info, rotate);
3403 err:
3404         console_unlock();
3405         return count;
3406 }
3407
3408 static ssize_t show_rotate(struct device *device,
3409                            struct device_attribute *attr,char *buf)
3410 {
3411         struct fb_info *info;
3412         int rotate = 0, idx;
3413
3414         if (fbcon_has_exited)
3415                 return 0;
3416
3417         console_lock();
3418         idx = con2fb_map[fg_console];
3419
3420         if (idx == -1 || registered_fb[idx] == NULL)
3421                 goto err;
3422
3423         info = registered_fb[idx];
3424         rotate = fbcon_get_rotate(info);
3425 err:
3426         console_unlock();
3427         return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
3428 }
3429
3430 static ssize_t show_cursor_blink(struct device *device,
3431                                  struct device_attribute *attr, char *buf)
3432 {
3433         struct fb_info *info;
3434         struct fbcon_ops *ops;
3435         int idx, blink = -1;
3436
3437         if (fbcon_has_exited)
3438                 return 0;
3439
3440         console_lock();
3441         idx = con2fb_map[fg_console];
3442
3443         if (idx == -1 || registered_fb[idx] == NULL)
3444                 goto err;
3445
3446         info = registered_fb[idx];
3447         ops = info->fbcon_par;
3448
3449         if (!ops)
3450                 goto err;
3451
3452         blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0;
3453 err:
3454         console_unlock();
3455         return snprintf(buf, PAGE_SIZE, "%d\n", blink);
3456 }
3457
3458 static ssize_t store_cursor_blink(struct device *device,
3459                                   struct device_attribute *attr,
3460                                   const char *buf, size_t count)
3461 {
3462         struct fb_info *info;
3463         int blink, idx;
3464         char **last = NULL;
3465
3466         if (fbcon_has_exited)
3467                 return count;
3468
3469         console_lock();
3470         idx = con2fb_map[fg_console];
3471
3472         if (idx == -1 || registered_fb[idx] == NULL)
3473                 goto err;
3474
3475         info = registered_fb[idx];
3476
3477         if (!info->fbcon_par)
3478                 goto err;
3479
3480         blink = simple_strtoul(buf, last, 0);
3481
3482         if (blink) {
3483                 fbcon_cursor_noblink = 0;
3484                 fbcon_add_cursor_timer(info);
3485         } else {
3486                 fbcon_cursor_noblink = 1;
3487                 fbcon_del_cursor_timer(info);
3488         }
3489
3490 err:
3491         console_unlock();
3492         return count;
3493 }
3494
3495 static struct device_attribute device_attrs[] = {
3496         __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
3497         __ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
3498         __ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
3499                store_cursor_blink),
3500 };
3501
3502 static int fbcon_init_device(void)
3503 {
3504         int i, error = 0;
3505
3506         fbcon_has_sysfs = 1;
3507
3508         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3509                 error = device_create_file(fbcon_device, &device_attrs[i]);
3510
3511                 if (error)
3512                         break;
3513         }
3514
3515         if (error) {
3516                 while (--i >= 0)
3517                         device_remove_file(fbcon_device, &device_attrs[i]);
3518
3519                 fbcon_has_sysfs = 0;
3520         }
3521
3522         return 0;
3523 }
3524
3525 static void fbcon_start(void)
3526 {
3527         if (num_registered_fb) {
3528                 int i;
3529
3530                 console_lock();
3531
3532                 for (i = 0; i < FB_MAX; i++) {
3533                         if (registered_fb[i] != NULL) {
3534                                 info_idx = i;
3535                                 break;
3536                         }
3537                 }
3538
3539                 do_fbcon_takeover(0);
3540                 console_unlock();
3541
3542         }
3543 }
3544
3545 static void fbcon_exit(void)
3546 {
3547         struct fb_info *info;
3548         int i, j, mapped;
3549
3550         if (fbcon_has_exited)
3551                 return;
3552
3553         kfree((void *)softback_buf);
3554         softback_buf = 0UL;
3555
3556         for (i = 0; i < FB_MAX; i++) {
3557                 int pending = 0;
3558
3559                 mapped = 0;
3560                 info = registered_fb[i];
3561
3562                 if (info == NULL)
3563                         continue;
3564
3565                 if (info->queue.func)
3566                         pending = cancel_work_sync(&info->queue);
3567                 DPRINTK("fbcon: %s pending work\n", (pending ? "canceled" :
3568                         "no"));
3569
3570                 for (j = first_fb_vc; j <= last_fb_vc; j++) {
3571                         if (con2fb_map[j] == i) {
3572                                 mapped = 1;
3573                                 break;
3574                         }
3575                 }
3576
3577                 if (mapped) {
3578                         if (info->fbops->fb_release)
3579                                 info->fbops->fb_release(info, 0);
3580                         module_put(info->fbops->owner);
3581
3582                         if (info->fbcon_par) {
3583                                 struct fbcon_ops *ops = info->fbcon_par;
3584
3585                                 fbcon_del_cursor_timer(info);
3586                                 kfree(ops->cursor_src);
3587                                 kfree(ops->cursor_state.mask);
3588                                 kfree(info->fbcon_par);
3589                                 info->fbcon_par = NULL;
3590                         }
3591
3592                         if (info->queue.func == fb_flashcursor)
3593                                 info->queue.func = NULL;
3594                 }
3595         }
3596
3597         fbcon_has_exited = 1;
3598 }
3599
3600 static int __init fb_console_init(void)
3601 {
3602         int i;
3603
3604         console_lock();
3605         fb_register_client(&fbcon_event_notifier);
3606         fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
3607                                      "fbcon");
3608
3609         if (IS_ERR(fbcon_device)) {
3610                 printk(KERN_WARNING "Unable to create device "
3611                        "for fbcon; errno = %ld\n",
3612                        PTR_ERR(fbcon_device));
3613                 fbcon_device = NULL;
3614         } else
3615                 fbcon_init_device();
3616
3617         for (i = 0; i < MAX_NR_CONSOLES; i++)
3618                 con2fb_map[i] = -1;
3619
3620         console_unlock();
3621         fbcon_start();
3622         return 0;
3623 }
3624
3625 fs_initcall(fb_console_init);
3626
3627 #ifdef MODULE
3628
3629 static void __exit fbcon_deinit_device(void)
3630 {
3631         int i;
3632
3633         if (fbcon_has_sysfs) {
3634                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3635                         device_remove_file(fbcon_device, &device_attrs[i]);
3636
3637                 fbcon_has_sysfs = 0;
3638         }
3639 }
3640
3641 static void __exit fb_console_exit(void)
3642 {
3643         console_lock();
3644         fb_unregister_client(&fbcon_event_notifier);
3645         fbcon_deinit_device();
3646         device_destroy(fb_class, MKDEV(0, 0));
3647         fbcon_exit();
3648         do_unregister_con_driver(&fb_con);
3649         console_unlock();
3650 }
3651
3652 module_exit(fb_console_exit);
3653
3654 #endif
3655
3656 MODULE_LICENSE("GPL");