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   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/config.h>
  62 #include <linux/module.h>
  63 #include <linux/types.h>
  64 #include <linux/sched.h>
  65 #include <linux/fs.h>
  66 #include <linux/kernel.h>
  67 #include <linux/delay.h>        /* MSch: for IRQ probe */
  68 #include <linux/tty.h>
  69 #include <linux/console.h>
  70 #include <linux/string.h>
  71 #include <linux/kd.h>
  72 #include <linux/slab.h>
  73 #include <linux/fb.h>
  74 #include <linux/vt_kern.h>
  75 #include <linux/selection.h>
  76 #include <linux/font.h>
  77 #include <linux/smp.h>
  78 #include <linux/init.h>
  79 #include <linux/interrupt.h>
  80 #include <linux/crc32.h> /* For counting font checksums */
  81 #include <asm/irq.h>
  82 #include <asm/system.h>
  83 #include <asm/uaccess.h>
  84 #ifdef CONFIG_ATARI
  85 #include <asm/atariints.h>
  86 #endif
  87 #ifdef CONFIG_MAC
  88 #include <asm/macints.h>
  89 #endif
  90 #if defined(__mc68000__) || defined(CONFIG_APUS)
  91 #include <asm/machdep.h>
  92 #include <asm/setup.h>
  93 #endif
  94
  95 #include "fbcon.h"
  96
  97 #ifdef FBCONDEBUG
  98 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
  99 #else
 100 #  define DPRINTK(fmt, args...)
 101 #endif
 102
 103 enum {
 104         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
 105         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
 106         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
 107 };
 108
 109 struct display fb_display[MAX_NR_CONSOLES];
 110 static signed char con2fb_map[MAX_NR_CONSOLES];
 111 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
 112 static int logo_height;
 113 static int logo_lines;
 114 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 115    enums.  */
 116 static int logo_shown = FBCON_LOGO_CANSHOW;
 117 /* Software scrollback */
 118 static int fbcon_softback_size = 32768;
 119 static unsigned long softback_buf, softback_curr;
 120 static unsigned long softback_in;
 121 static unsigned long softback_top, softback_end;
 122 static int softback_lines;
 123 /* console mappings */
 124 static int first_fb_vc;
 125 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 126 static int fbcon_is_default = 1;
 127 /* font data */
 128 static char fontname[40];
 129
 130 /* current fb_info */
 131 static int info_idx = -1;
 132
 133 static const struct consw fb_con;
 134
 135 #define CM_SOFTBACK     (8)
 136
 137 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 138
 139 static void fbcon_free_font(struct display *);
 140 static int fbcon_set_origin(struct vc_data *);
 141
 142 #define CURSOR_DRAW_DELAY               (1)
 143
 144 /* # VBL ints between cursor state changes */
 145 #define ATARI_CURSOR_BLINK_RATE         (42)
 146 #define MAC_CURSOR_BLINK_RATE           (32)
 147 #define DEFAULT_CURSOR_BLINK_RATE       (20)
 148
 149 static int vbl_cursor_cnt;
 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 int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
 174 static int fbcon_scrolldelta(struct vc_data *vc, int lines);
 175
 176 /*
 177  *  Internal routines
 178  */
 179 static __inline__ int real_y(struct display *p, int ypos);
 180 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 181 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 182 static __inline__ void ypan_up(struct vc_data *vc, int count);
 183 static __inline__ void ypan_down(struct vc_data *vc, int count);
 184 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
 185                             int dy, int dx, int height, int width, u_int y_break);
 186 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 187                            struct vc_data *vc);
 188 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 189                               int unit);
 190 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 191                               int line, int count, int dy);
 192
 193 #ifdef CONFIG_MAC
 194 /*
 195  * On the Macintoy, there may or may not be a working VBL int. We need to probe
 196  */
 197 static int vbl_detected;
 198
 199 static irqreturn_t fb_vbl_detect(int irq, void *dummy, struct pt_regs *fp)
 200 {
 201         vbl_detected++;
 202         return IRQ_HANDLED;
 203 }
 204 #endif
 205
 206 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 207 {
 208         struct fbcon_ops *ops = info->fbcon_par;
 209
 210         return (info->state != FBINFO_STATE_RUNNING ||
 211                 vc->vc_mode != KD_TEXT || ops->graphics);
 212 }
 213
 214 static inline int get_color(struct vc_data *vc, struct fb_info *info,
 215               u16 c, int is_fg)
 216 {
 217         int depth = fb_get_color_depth(&info->var, &info->fix);
 218         int color = 0;
 219
 220         if (console_blanked) {
 221                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 222
 223                 c = vc->vc_video_erase_char & charmask;
 224         }
 225
 226         if (depth != 1)
 227                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 228                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 229
 230         switch (depth) {
 231         case 1:
 232         {
 233                 int col = ~(0xfff << (max(info->var.green.length,
 234                                           max(info->var.red.length,
 235                                               info->var.blue.length)))) & 0xff;
 236
 237                 /* 0 or 1 */
 238                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 239                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 240
 241                 if (console_blanked)
 242                         fg = bg;
 243
 244                 color = (is_fg) ? fg : bg;
 245                 break;
 246         }
 247         case 2:
 248                 /*
 249                  * Scale down 16-colors to 4 colors. Default 4-color palette
 250                  * is grayscale. However, simply dividing the values by 4
 251                  * will not work, as colors 1, 2 and 3 will be scaled-down
 252                  * to zero rendering them invisible.  So empirically convert
 253                  * colors to a sane 4-level grayscale.
 254                  */
 255                 switch (color) {
 256                 case 0:
 257                         color = 0; /* black */
 258                         break;
 259                 case 1 ... 6:
 260                         color = 2; /* white */
 261                         break;
 262                 case 7 ... 8:
 263                         color = 1; /* gray */
 264                         break;
 265                 default:
 266                         color = 3; /* intense white */
 267                         break;
 268                 }
 269                 break;
 270         case 3:
 271                 /*
 272                  * Last 8 entries of default 16-color palette is a more intense
 273                  * version of the first 8 (i.e., same chrominance, different
 274                  * luminance).
 275                  */
 276                 color &= 7;
 277                 break;
 278         }
 279
 280
 281         return color;
 282 }
 283
 284 static void fbcon_update_softback(struct vc_data *vc)
 285 {
 286         int l = fbcon_softback_size / vc->vc_size_row;
 287
 288         if (l > 5)
 289                 softback_end = softback_buf + l * vc->vc_size_row;
 290         else
 291                 /* Smaller scrollback makes no sense, and 0 would screw
 292                    the operation totally */
 293                 softback_top = 0;
 294 }
 295
 296 static void fb_flashcursor(void *private)
 297 {
 298         struct fb_info *info = private;
 299         struct fbcon_ops *ops = info->fbcon_par;
 300         struct display *p;
 301         struct vc_data *vc = NULL;
 302         int c;
 303         int mode;
 304
 305         if (ops->currcon != -1)
 306                 vc = vc_cons[ops->currcon].d;
 307
 308         if (!vc || !CON_IS_VISIBLE(vc) ||
 309             fbcon_is_inactive(vc, info) ||
 310             registered_fb[con2fb_map[vc->vc_num]] != info ||
 311             vc_cons[ops->currcon].d->vc_deccm != 1)
 312                 return;
 313         acquire_console_sem();
 314         p = &fb_display[vc->vc_num];
 315         c = scr_readw((u16 *) vc->vc_pos);
 316         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 317                 CM_ERASE : CM_DRAW;
 318         ops->cursor(vc, info, p, mode, softback_lines, get_color(vc, info, c, 1),
 319                     get_color(vc, info, c, 0));
 320         release_console_sem();
 321 }
 322
 323 #if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
 324 static int cursor_blink_rate;
 325 static irqreturn_t fb_vbl_handler(int irq, void *dev_id, struct pt_regs *fp)
 326 {
 327         struct fb_info *info = dev_id;
 328
 329         if (vbl_cursor_cnt && --vbl_cursor_cnt == 0) {
 330                 schedule_work(&info->queue);
 331                 vbl_cursor_cnt = cursor_blink_rate;
 332         }
 333         return IRQ_HANDLED;
 334 }
 335 #endif
 336
 337 static void cursor_timer_handler(unsigned long dev_addr)
 338 {
 339         struct fb_info *info = (struct fb_info *) dev_addr;
 340         struct fbcon_ops *ops = info->fbcon_par;
 341
 342         schedule_work(&info->queue);
 343         mod_timer(&ops->cursor_timer, jiffies + HZ/5);
 344 }
 345
 346 static void fbcon_add_cursor_timer(struct fb_info *info)
 347 {
 348         struct fbcon_ops *ops = info->fbcon_par;
 349
 350         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
 351             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER)) {
 352                 if (!info->queue.func)
 353                         INIT_WORK(&info->queue, fb_flashcursor, info);
 354
 355                 init_timer(&ops->cursor_timer);
 356                 ops->cursor_timer.function = cursor_timer_handler;
 357                 ops->cursor_timer.expires = jiffies + HZ / 5;
 358                 ops->cursor_timer.data = (unsigned long ) info;
 359                 add_timer(&ops->cursor_timer);
 360                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
 361         }
 362 }
 363
 364 static void fbcon_del_cursor_timer(struct fb_info *info)
 365 {
 366         struct fbcon_ops *ops = info->fbcon_par;
 367
 368         if (info->queue.func == fb_flashcursor &&
 369             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
 370                 del_timer_sync(&ops->cursor_timer);
 371                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
 372         }
 373 }
 374
 375 #ifndef MODULE
 376 static int __init fb_console_setup(char *this_opt)
 377 {
 378         char *options;
 379         int i, j;
 380
 381         if (!this_opt || !*this_opt)
 382                 return 0;
 383
 384         while ((options = strsep(&this_opt, ",")) != NULL) {
 385                 if (!strncmp(options, "font:", 5))
 386                         strcpy(fontname, options + 5);
 387
 388                 if (!strncmp(options, "scrollback:", 11)) {
 389                         options += 11;
 390                         if (*options) {
 391                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
 392                                 if (*options == 'k' || *options == 'K') {
 393                                         fbcon_softback_size *= 1024;
 394                                         options++;
 395                                 }
 396                                 if (*options != ',')
 397                                         return 0;
 398                                 options++;
 399                         } else
 400                                 return 0;
 401                 }
 402
 403                 if (!strncmp(options, "map:", 4)) {
 404                         options += 4;
 405                         if (*options)
 406                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 407                                         if (!options[j])
 408                                                 j = 0;
 409                                         con2fb_map_boot[i] =
 410                                                 (options[j++]-'0') % FB_MAX;
 411                                 }
 412                         return 0;
 413                 }
 414
 415                 if (!strncmp(options, "vc:", 3)) {
 416                         options += 3;
 417                         if (*options)
 418                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 419                         if (first_fb_vc < 0)
 420                                 first_fb_vc = 0;
 421                         if (*options++ == '-')
 422                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 423                         fbcon_is_default = 0;
 424                 }
 425         }
 426         return 0;
 427 }
 428
 429 __setup("fbcon=", fb_console_setup);
 430 #endif
 431
 432 static int search_fb_in_map(int idx)
 433 {
 434         int i, retval = 0;
 435
 436         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 437                 if (con2fb_map[i] == idx)
 438                         retval = 1;
 439         }
 440         return retval;
 441 }
 442
 443 static int search_for_mapped_con(void)
 444 {
 445         int i, retval = 0;
 446
 447         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 448                 if (con2fb_map[i] != -1)
 449                         retval = 1;
 450         }
 451         return retval;
 452 }
 453
 454 static int fbcon_takeover(int show_logo)
 455 {
 456         int err, i;
 457
 458         if (!num_registered_fb)
 459                 return -ENODEV;
 460
 461         if (!show_logo)
 462                 logo_shown = FBCON_LOGO_DONTSHOW;
 463
 464         for (i = first_fb_vc; i <= last_fb_vc; i++)
 465                 con2fb_map[i] = info_idx;
 466
 467         err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 468                                 fbcon_is_default);
 469         if (err) {
 470                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
 471                         con2fb_map[i] = -1;
 472                 }
 473                 info_idx = -1;
 474         }
 475
 476         return err;
 477 }
 478
 479 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 480                                int cols, int rows, int new_cols, int new_rows)
 481 {
 482         /* Need to make room for the logo */
 483         int cnt, erase = vc->vc_video_erase_char, step;
 484         unsigned short *save = NULL, *r, *q;
 485
 486         /*
 487          * remove underline attribute from erase character
 488          * if black and white framebuffer.
 489          */
 490         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 491                 erase &= ~0x400;
 492         logo_height = fb_prepare_logo(info);
 493         logo_lines = (logo_height + vc->vc_font.height - 1) /
 494                 vc->vc_font.height;
 495         q = (unsigned short *) (vc->vc_origin +
 496                                 vc->vc_size_row * rows);
 497         step = logo_lines * cols;
 498         for (r = q - logo_lines * cols; r < q; r++)
 499                 if (scr_readw(r) != vc->vc_video_erase_char)
 500                         break;
 501         if (r != q && new_rows >= rows + logo_lines) {
 502                 save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
 503                 if (save) {
 504                         int i = cols < new_cols ? cols : new_cols;
 505                         scr_memsetw(save, erase, logo_lines * new_cols * 2);
 506                         r = q - step;
 507                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 508                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 509                         r = q;
 510                 }
 511         }
 512         if (r == q) {
 513                 /* We can scroll screen down */
 514                 r = q - step - cols;
 515                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 516                         scr_memcpyw(r + step, r, vc->vc_size_row);
 517                         r -= cols;
 518                 }
 519                 if (!save) {
 520                         vc->vc_y += logo_lines;
 521                         vc->vc_pos += logo_lines * vc->vc_size_row;
 522                 }
 523         }
 524         scr_memsetw((unsigned short *) vc->vc_origin,
 525                     erase,
 526                     vc->vc_size_row * logo_lines);
 527
 528         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
 529                 fbcon_clear_margins(vc, 0);
 530                 update_screen(vc);
 531         }
 532
 533         if (save) {
 534                 q = (unsigned short *) (vc->vc_origin +
 535                                         vc->vc_size_row *
 536                                         rows);
 537                 scr_memcpyw(q, save, logo_lines * new_cols * 2);
 538                 vc->vc_y += logo_lines;
 539                 vc->vc_pos += logo_lines * vc->vc_size_row;
 540                 kfree(save);
 541         }
 542
 543         if (logo_lines > vc->vc_bottom) {
 544                 logo_shown = FBCON_LOGO_CANSHOW;
 545                 printk(KERN_INFO
 546                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
 547         } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
 548                 logo_shown = FBCON_LOGO_DRAW;
 549                 vc->vc_top = logo_lines;
 550         }
 551 }
 552
 553 #ifdef CONFIG_FB_TILEBLITTING
 554 static void set_blitting_type(struct vc_data *vc, struct fb_info *info,
 555                               struct display *p)
 556 {
 557         struct fbcon_ops *ops = info->fbcon_par;
 558
 559         if ((info->flags & FBINFO_MISC_TILEBLITTING))
 560                 fbcon_set_tileops(vc, info, p, ops);
 561         else
 562                 fbcon_set_bitops(ops);
 563 }
 564 #else
 565 static void set_blitting_type(struct vc_data *vc, struct fb_info *info,
 566                               struct display *p)
 567 {
 568         struct fbcon_ops *ops = info->fbcon_par;
 569
 570         info->flags &= ~FBINFO_MISC_TILEBLITTING;
 571         fbcon_set_bitops(ops);
 572 }
 573 #endif /* CONFIG_MISC_TILEBLITTING */
 574
 575
 576 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
 577                                   int unit, int oldidx)
 578 {
 579         struct fbcon_ops *ops = NULL;
 580         int err = 0;
 581
 582         if (!try_module_get(info->fbops->owner))
 583                 err = -ENODEV;
 584
 585         if (!err && info->fbops->fb_open &&
 586             info->fbops->fb_open(info, 0))
 587                 err = -ENODEV;
 588
 589         if (!err) {
 590                 ops = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 591                 if (!ops)
 592                         err = -ENOMEM;
 593         }
 594
 595         if (!err) {
 596                 memset(ops, 0, sizeof(struct fbcon_ops));
 597                 info->fbcon_par = ops;
 598                 set_blitting_type(vc, info, NULL);
 599         }
 600
 601         if (err) {
 602                 con2fb_map[unit] = oldidx;
 603                 module_put(info->fbops->owner);
 604         }
 605
 606         return err;
 607 }
 608
 609 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 610                                   struct fb_info *newinfo, int unit,
 611                                   int oldidx, int found)
 612 {
 613         struct fbcon_ops *ops = oldinfo->fbcon_par;
 614         int err = 0;
 615
 616         if (oldinfo->fbops->fb_release &&
 617             oldinfo->fbops->fb_release(oldinfo, 0)) {
 618                 con2fb_map[unit] = oldidx;
 619                 if (!found && newinfo->fbops->fb_release)
 620                         newinfo->fbops->fb_release(newinfo, 0);
 621                 if (!found)
 622                         module_put(newinfo->fbops->owner);
 623                 err = -ENODEV;
 624         }
 625
 626         if (!err) {
 627                 fbcon_del_cursor_timer(oldinfo);
 628                 kfree(ops->cursor_state.mask);
 629                 kfree(ops->cursor_data);
 630                 kfree(oldinfo->fbcon_par);
 631                 oldinfo->fbcon_par = NULL;
 632                 module_put(oldinfo->fbops->owner);
 633                 /*
 634                   If oldinfo and newinfo are driving the same hardware,
 635                   the fb_release() method of oldinfo may attempt to
 636                   restore the hardware state.  This will leave the
 637                   newinfo in an undefined state. Thus, a call to
 638                   fb_set_par() may be needed for the newinfo.
 639                 */
 640                 if (newinfo->fbops->fb_set_par)
 641                         newinfo->fbops->fb_set_par(newinfo);
 642         }
 643
 644         return err;
 645 }
 646
 647 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 648                                 int unit, int show_logo)
 649 {
 650         struct fbcon_ops *ops = info->fbcon_par;
 651
 652         ops->currcon = fg_console;
 653
 654         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT))
 655                 info->fbops->fb_set_par(info);
 656
 657         ops->flags |= FBCON_FLAGS_INIT;
 658         ops->graphics = 0;
 659
 660         if (vc)
 661                 fbcon_set_disp(info, &info->var, vc);
 662         else
 663                 fbcon_preset_disp(info, &info->var, unit);
 664
 665         if (show_logo) {
 666                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 667                 struct fb_info *fg_info =
 668                         registered_fb[con2fb_map[fg_console]];
 669
 670                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 671                                    fg_vc->vc_rows, fg_vc->vc_cols,
 672                                    fg_vc->vc_rows);
 673         }
 674
 675         update_screen(vc_cons[fg_console].d);
 676 }
 677
 678 /**
 679  *      set_con2fb_map - map console to frame buffer device
 680  *      @unit: virtual console number to map
 681  *      @newidx: frame buffer index to map virtual console to
 682  *      @user: user request
 683  *
 684  *      Maps a virtual console @unit to a frame buffer device
 685  *      @newidx.
 686  */
 687 static int set_con2fb_map(int unit, int newidx, int user)
 688 {
 689         struct vc_data *vc = vc_cons[unit].d;
 690         int oldidx = con2fb_map[unit];
 691         struct fb_info *info = registered_fb[newidx];
 692         struct fb_info *oldinfo = NULL;
 693         int found, err = 0;
 694
 695         if (oldidx == newidx)
 696                 return 0;
 697
 698         if (!info)
 699                 err =  -EINVAL;
 700
 701         if (!err && !search_for_mapped_con()) {
 702                 info_idx = newidx;
 703                 return fbcon_takeover(0);
 704         }
 705
 706         if (oldidx != -1)
 707                 oldinfo = registered_fb[oldidx];
 708
 709         found = search_fb_in_map(newidx);
 710
 711         acquire_console_sem();
 712         con2fb_map[unit] = newidx;
 713         if (!err && !found)
 714                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 715
 716
 717         /*
 718          * If old fb is not mapped to any of the consoles,
 719          * fbcon should release it.
 720          */
 721         if (!err && oldinfo && !search_fb_in_map(oldidx))
 722                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 723                                              found);
 724
 725         if (!err) {
 726                 int show_logo = (fg_console == 0 && !user &&
 727                                  logo_shown != FBCON_LOGO_DONTSHOW);
 728
 729                 if (!found)
 730                         fbcon_add_cursor_timer(info);
 731                 con2fb_map_boot[unit] = newidx;
 732                 con2fb_init_display(vc, info, unit, show_logo);
 733         }
 734
 735         release_console_sem();
 736         return err;
 737 }
 738
 739 /*
 740  *  Low Level Operations
 741  */
 742 /* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
 743 static int var_to_display(struct display *disp,
 744                           struct fb_var_screeninfo *var,
 745                           struct fb_info *info)
 746 {
 747         disp->xres_virtual = var->xres_virtual;
 748         disp->yres_virtual = var->yres_virtual;
 749         disp->bits_per_pixel = var->bits_per_pixel;
 750         disp->grayscale = var->grayscale;
 751         disp->nonstd = var->nonstd;
 752         disp->accel_flags = var->accel_flags;
 753         disp->height = var->height;
 754         disp->width = var->width;
 755         disp->red = var->red;
 756         disp->green = var->green;
 757         disp->blue = var->blue;
 758         disp->transp = var->transp;
 759         disp->rotate = var->rotate;
 760         disp->mode = fb_match_mode(var, &info->modelist);
 761         if (disp->mode == NULL)
 762                 /* This should not happen */
 763                 return -EINVAL;
 764         return 0;
 765 }
 766
 767 static void display_to_var(struct fb_var_screeninfo *var,
 768                            struct display *disp)
 769 {
 770         fb_videomode_to_var(var, disp->mode);
 771         var->xres_virtual = disp->xres_virtual;
 772         var->yres_virtual = disp->yres_virtual;
 773         var->bits_per_pixel = disp->bits_per_pixel;
 774         var->grayscale = disp->grayscale;
 775         var->nonstd = disp->nonstd;
 776         var->accel_flags = disp->accel_flags;
 777         var->height = disp->height;
 778         var->width = disp->width;
 779         var->red = disp->red;
 780         var->green = disp->green;
 781         var->blue = disp->blue;
 782         var->transp = disp->transp;
 783         var->rotate = disp->rotate;
 784 }
 785
 786 static const char *fbcon_startup(void)
 787 {
 788         const char *display_desc = "frame buffer device";
 789         struct display *p = &fb_display[fg_console];
 790         struct vc_data *vc = vc_cons[fg_console].d;
 791         const struct font_desc *font = NULL;
 792         struct module *owner;
 793         struct fb_info *info = NULL;
 794         struct fbcon_ops *ops;
 795         int rows, cols;
 796         int irqres;
 797
 798         irqres = 1;
 799         /*
 800          *  If num_registered_fb is zero, this is a call for the dummy part.
 801          *  The frame buffer devices weren't initialized yet.
 802          */
 803         if (!num_registered_fb || info_idx == -1)
 804                 return display_desc;
 805         /*
 806          * Instead of blindly using registered_fb[0], we use info_idx, set by
 807          * fb_console_init();
 808          */
 809         info = registered_fb[info_idx];
 810         if (!info)
 811                 return NULL;
 812
 813         owner = info->fbops->owner;
 814         if (!try_module_get(owner))
 815                 return NULL;
 816         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 817                 module_put(owner);
 818                 return NULL;
 819         }
 820
 821         ops = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 822         if (!ops) {
 823                 module_put(owner);
 824                 return NULL;
 825         }
 826
 827         memset(ops, 0, sizeof(struct fbcon_ops));
 828         ops->currcon = -1;
 829         ops->graphics = 1;
 830         info->fbcon_par = ops;
 831         set_blitting_type(vc, info, NULL);
 832
 833         if (info->fix.type != FB_TYPE_TEXT) {
 834                 if (fbcon_softback_size) {
 835                         if (!softback_buf) {
 836                                 softback_buf =
 837                                     (unsigned long)
 838                                     kmalloc(fbcon_softback_size,
 839                                             GFP_KERNEL);
 840                                 if (!softback_buf) {
 841                                         fbcon_softback_size = 0;
 842                                         softback_top = 0;
 843                                 }
 844                         }
 845                 } else {
 846                         if (softback_buf) {
 847                                 kfree((void *) softback_buf);
 848                                 softback_buf = 0;
 849                                 softback_top = 0;
 850                         }
 851                 }
 852                 if (softback_buf)
 853                         softback_in = softback_top = softback_curr =
 854                             softback_buf;
 855                 softback_lines = 0;
 856         }
 857
 858         /* Setup default font */
 859         if (!p->fontdata) {
 860                 if (!fontname[0] || !(font = find_font(fontname)))
 861                         font = get_default_font(info->var.xres,
 862                                                 info->var.yres);
 863                 vc->vc_font.width = font->width;
 864                 vc->vc_font.height = font->height;
 865                 vc->vc_font.data = (void *)(p->fontdata = font->data);
 866                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
 867         }
 868
 869         cols = info->var.xres / vc->vc_font.width;
 870         rows = info->var.yres / vc->vc_font.height;
 871         vc_resize(vc, cols, rows);
 872
 873         DPRINTK("mode:   %s\n", info->fix.id);
 874         DPRINTK("visual: %d\n", info->fix.visual);
 875         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
 876                 info->var.yres,
 877                 info->var.bits_per_pixel);
 878
 879 #ifdef CONFIG_ATARI
 880         if (MACH_IS_ATARI) {
 881                 cursor_blink_rate = ATARI_CURSOR_BLINK_RATE;
 882                 irqres =
 883                     request_irq(IRQ_AUTO_4, fb_vbl_handler,
 884                                 IRQ_TYPE_PRIO, "framebuffer vbl",
 885                                 info);
 886         }
 887 #endif                          /* CONFIG_ATARI */
 888
 889 #ifdef CONFIG_MAC
 890         /*
 891          * On a Macintoy, the VBL interrupt may or may not be active.
 892          * As interrupt based cursor is more reliable and race free, we
 893          * probe for VBL interrupts.
 894          */
 895         if (MACH_IS_MAC) {
 896                 int ct = 0;
 897                 /*
 898                  * Probe for VBL: set temp. handler ...
 899                  */
 900                 irqres = request_irq(IRQ_MAC_VBL, fb_vbl_detect, 0,
 901                                      "framebuffer vbl", info);
 902                 vbl_detected = 0;
 903
 904                 /*
 905                  * ... and spin for 20 ms ...
 906                  */
 907                 while (!vbl_detected && ++ct < 1000)
 908                         udelay(20);
 909
 910                 if (ct == 1000)
 911                         printk
 912                             ("fbcon_startup: No VBL detected, using timer based cursor.\n");
 913
 914                 free_irq(IRQ_MAC_VBL, fb_vbl_detect);
 915
 916                 if (vbl_detected) {
 917                         /*
 918                          * interrupt based cursor ok
 919                          */
 920                         cursor_blink_rate = MAC_CURSOR_BLINK_RATE;
 921                         irqres =
 922                             request_irq(IRQ_MAC_VBL, fb_vbl_handler, 0,
 923                                         "framebuffer vbl", info);
 924                 } else {
 925                         /*
 926                          * VBL not detected: fall through, use timer based cursor
 927                          */
 928                         irqres = 1;
 929                 }
 930         }
 931 #endif                          /* CONFIG_MAC */
 932
 933         fbcon_add_cursor_timer(info);
 934         return display_desc;
 935 }
 936
 937 static void fbcon_init(struct vc_data *vc, int init)
 938 {
 939         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
 940         struct fbcon_ops *ops;
 941         struct vc_data **default_mode = vc->vc_display_fg;
 942         struct vc_data *svc = *default_mode;
 943         struct display *t, *p = &fb_display[vc->vc_num];
 944         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
 945         int cap;
 946
 947         if (info_idx == -1 || info == NULL)
 948             return;
 949
 950         cap = info->flags;
 951
 952         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
 953             (info->fix.type == FB_TYPE_TEXT))
 954                 logo = 0;
 955
 956         info->var.xoffset = info->var.yoffset = p->yscroll = 0; /* reset wrap/pan */
 957
 958         if (var_to_display(p, &info->var, info))
 959                 return;
 960
 961         /* If we are not the first console on this
 962            fb, copy the font from that console */
 963         t = &fb_display[svc->vc_num];
 964         if (!vc->vc_font.data) {
 965                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
 966                 vc->vc_font.width = (*default_mode)->vc_font.width;
 967                 vc->vc_font.height = (*default_mode)->vc_font.height;
 968                 p->userfont = t->userfont;
 969                 if (p->userfont)
 970                         REFCOUNT(p->fontdata)++;
 971         }
 972         if (p->userfont)
 973                 charcnt = FNTCHARCNT(p->fontdata);
 974         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
 975         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 976         if (charcnt == 256) {
 977                 vc->vc_hi_font_mask = 0;
 978         } else {
 979                 vc->vc_hi_font_mask = 0x100;
 980                 if (vc->vc_can_do_color)
 981                         vc->vc_complement_mask <<= 1;
 982         }
 983
 984         if (!*svc->vc_uni_pagedir_loc)
 985                 con_set_default_unimap(svc);
 986         if (!*vc->vc_uni_pagedir_loc)
 987                 con_copy_unimap(vc, svc);
 988
 989         cols = vc->vc_cols;
 990         rows = vc->vc_rows;
 991         new_cols = info->var.xres / vc->vc_font.width;
 992         new_rows = info->var.yres / vc->vc_font.height;
 993         vc_resize(vc, new_cols, new_rows);
 994
 995         ops = info->fbcon_par;
 996         /*
 997          * We must always set the mode. The mode of the previous console
 998          * driver could be in the same resolution but we are using different
 999          * hardware so we have to initialize the hardware.
1000          *
1001          * We need to do it in fbcon_init() to prevent screen corruption.
1002          */
1003         if (CON_IS_VISIBLE(vc)) {
1004                 if (info->fbops->fb_set_par &&
1005                     !(ops->flags & FBCON_FLAGS_INIT))
1006                         info->fbops->fb_set_par(info);
1007                 ops->flags |= FBCON_FLAGS_INIT;
1008         }
1009
1010         ops->graphics = 0;
1011
1012         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1013             !(cap & FBINFO_HWACCEL_DISABLED))
1014                 p->scrollmode = SCROLL_MOVE;
1015         else /* default to something safe */
1016                 p->scrollmode = SCROLL_REDRAW;
1017
1018         /*
1019          *  ++guenther: console.c:vc_allocate() relies on initializing
1020          *  vc_{cols,rows}, but we must not set those if we are only
1021          *  resizing the console.
1022          */
1023         if (!init) {
1024                 vc->vc_cols = new_cols;
1025                 vc->vc_rows = new_rows;
1026         }
1027
1028         if (logo)
1029                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1030
1031         if (vc == svc && softback_buf)
1032                 fbcon_update_softback(vc);
1033 }
1034
1035 static void fbcon_deinit(struct vc_data *vc)
1036 {
1037         struct display *p = &fb_display[vc->vc_num];
1038
1039         if (info_idx != -1)
1040             return;
1041         fbcon_free_font(p);
1042 }
1043
1044 /* ====================================================================== */
1045
1046 /*  fbcon_XXX routines - interface used by the world
1047  *
1048  *  This system is now divided into two levels because of complications
1049  *  caused by hardware scrolling. Top level functions:
1050  *
1051  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1052  *
1053  *  handles y values in range [0, scr_height-1] that correspond to real
1054  *  screen positions. y_wrap shift means that first line of bitmap may be
1055  *  anywhere on this display. These functions convert lineoffsets to
1056  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1057  *
1058  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1059  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1060  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1061  *
1062  *  WARNING:
1063  *
1064  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1065  *  Implies should only really hardware scroll in rows. Only reason for
1066  *  restriction is simplicity & efficiency at the moment.
1067  */
1068
1069 static __inline__ int real_y(struct display *p, int ypos)
1070 {
1071         int rows = p->vrows;
1072
1073         ypos += p->yscroll;
1074         return ypos < rows ? ypos : ypos - rows;
1075 }
1076
1077
1078 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1079                         int width)
1080 {
1081         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1082         struct fbcon_ops *ops = info->fbcon_par;
1083
1084         struct display *p = &fb_display[vc->vc_num];
1085         u_int y_break;
1086
1087         if (fbcon_is_inactive(vc, info))
1088                 return;
1089
1090         if (!height || !width)
1091                 return;
1092
1093         /* Split blits that cross physical y_wrap boundary */
1094
1095         y_break = p->vrows - p->yscroll;
1096         if (sy < y_break && sy + height - 1 >= y_break) {
1097                 u_int b = y_break - sy;
1098                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1099                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1100                                  width);
1101         } else
1102                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1103 }
1104
1105 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1106                         int count, int ypos, int xpos)
1107 {
1108         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1109         struct display *p = &fb_display[vc->vc_num];
1110         struct fbcon_ops *ops = info->fbcon_par;
1111
1112         if (!fbcon_is_inactive(vc, info))
1113                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1114                            get_color(vc, info, scr_readw(s), 1),
1115                            get_color(vc, info, scr_readw(s), 0));
1116 }
1117
1118 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1119 {
1120         unsigned short chr;
1121
1122         scr_writew(c, &chr);
1123         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1124 }
1125
1126 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1127 {
1128         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1129         struct fbcon_ops *ops = info->fbcon_par;
1130
1131         if (!fbcon_is_inactive(vc, info))
1132                 ops->clear_margins(vc, info, bottom_only);
1133 }
1134
1135 static void fbcon_cursor(struct vc_data *vc, int mode)
1136 {
1137         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1138         struct fbcon_ops *ops = info->fbcon_par;
1139         struct display *p = &fb_display[vc->vc_num];
1140         int y;
1141         int c = scr_readw((u16 *) vc->vc_pos);
1142
1143         if (fbcon_is_inactive(vc, info))
1144                 return;
1145
1146         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1147         if (mode & CM_SOFTBACK) {
1148                 mode &= ~CM_SOFTBACK;
1149                 y = softback_lines;
1150         } else {
1151                 if (softback_lines)
1152                         fbcon_set_origin(vc);
1153                 y = 0;
1154         }
1155
1156         ops->cursor(vc, info, p, mode, y, get_color(vc, info, c, 1),
1157                     get_color(vc, info, c, 0));
1158         vbl_cursor_cnt = CURSOR_DRAW_DELAY;
1159 }
1160
1161 static int scrollback_phys_max = 0;
1162 static int scrollback_max = 0;
1163 static int scrollback_current = 0;
1164
1165 static int update_var(int con, struct fb_info *info)
1166 {
1167         if (con == ((struct fbcon_ops *)info->fbcon_par)->currcon)
1168                 return fb_pan_display(info, &info->var);
1169         return 0;
1170 }
1171
1172 /*
1173  * If no vc is existent yet, just set struct display
1174  */
1175 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1176                               int unit)
1177 {
1178         struct display *p = &fb_display[unit];
1179         struct display *t = &fb_display[fg_console];
1180
1181         var->xoffset = var->yoffset = p->yscroll = 0;
1182         if (var_to_display(p, var, info))
1183                 return;
1184
1185         p->fontdata = t->fontdata;
1186         p->userfont = t->userfont;
1187         if (p->userfont)
1188                 REFCOUNT(p->fontdata)++;
1189 }
1190
1191 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1192                            struct vc_data *vc)
1193 {
1194         struct display *p = &fb_display[vc->vc_num], *t;
1195         struct vc_data **default_mode = vc->vc_display_fg;
1196         struct vc_data *svc = *default_mode;
1197         int rows, cols, charcnt = 256;
1198
1199         var->xoffset = var->yoffset = p->yscroll = 0;
1200         if (var_to_display(p, var, info))
1201                 return;
1202         t = &fb_display[svc->vc_num];
1203         if (!vc->vc_font.data) {
1204                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1205                 vc->vc_font.width = (*default_mode)->vc_font.width;
1206                 vc->vc_font.height = (*default_mode)->vc_font.height;
1207                 p->userfont = t->userfont;
1208                 if (p->userfont)
1209                         REFCOUNT(p->fontdata)++;
1210         }
1211         if (p->userfont)
1212                 charcnt = FNTCHARCNT(p->fontdata);
1213
1214         var->activate = FB_ACTIVATE_NOW;
1215         info->var.activate = var->activate;
1216         info->var.yoffset = info->var.xoffset = 0;
1217         fb_set_var(info, var);
1218
1219         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1220         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1221         if (charcnt == 256) {
1222                 vc->vc_hi_font_mask = 0;
1223         } else {
1224                 vc->vc_hi_font_mask = 0x100;
1225                 if (vc->vc_can_do_color)
1226                         vc->vc_complement_mask <<= 1;
1227         }
1228
1229         if (!*svc->vc_uni_pagedir_loc)
1230                 con_set_default_unimap(svc);
1231         if (!*vc->vc_uni_pagedir_loc)
1232                 con_copy_unimap(vc, svc);
1233
1234         cols = var->xres / vc->vc_font.width;
1235         rows = var->yres / vc->vc_font.height;
1236         vc_resize(vc, cols, rows);
1237         if (CON_IS_VISIBLE(vc)) {
1238                 update_screen(vc);
1239                 if (softback_buf)
1240                         fbcon_update_softback(vc);
1241         }
1242 }
1243
1244 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1245 {
1246         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1247         struct display *p = &fb_display[vc->vc_num];
1248
1249         p->yscroll += count;
1250         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1251                 p->yscroll -= p->vrows;
1252         info->var.xoffset = 0;
1253         info->var.yoffset = p->yscroll * vc->vc_font.height;
1254         info->var.vmode |= FB_VMODE_YWRAP;
1255         update_var(vc->vc_num, info);
1256         scrollback_max += count;
1257         if (scrollback_max > scrollback_phys_max)
1258                 scrollback_max = scrollback_phys_max;
1259         scrollback_current = 0;
1260 }
1261
1262 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1263 {
1264         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1265         struct display *p = &fb_display[vc->vc_num];
1266
1267         p->yscroll -= count;
1268         if (p->yscroll < 0)     /* Deal with wrap */
1269                 p->yscroll += p->vrows;
1270         info->var.xoffset = 0;
1271         info->var.yoffset = p->yscroll * vc->vc_font.height;
1272         info->var.vmode |= FB_VMODE_YWRAP;
1273         update_var(vc->vc_num, info);
1274         scrollback_max -= count;
1275         if (scrollback_max < 0)
1276                 scrollback_max = 0;
1277         scrollback_current = 0;
1278 }
1279
1280 static __inline__ void ypan_up(struct vc_data *vc, int count)
1281 {
1282         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1283         struct display *p = &fb_display[vc->vc_num];
1284         struct fbcon_ops *ops = info->fbcon_par;
1285
1286         p->yscroll += count;
1287         if (p->yscroll > p->vrows - vc->vc_rows) {
1288                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1289                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1290                 p->yscroll -= p->vrows - vc->vc_rows;
1291         }
1292         info->var.xoffset = 0;
1293         info->var.yoffset = p->yscroll * vc->vc_font.height;
1294         info->var.vmode &= ~FB_VMODE_YWRAP;
1295         update_var(vc->vc_num, info);
1296         fbcon_clear_margins(vc, 1);
1297         scrollback_max += count;
1298         if (scrollback_max > scrollback_phys_max)
1299                 scrollback_max = scrollback_phys_max;
1300         scrollback_current = 0;
1301 }
1302
1303 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1304 {
1305         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1306         struct display *p = &fb_display[vc->vc_num];
1307         int redraw = 0;
1308
1309         p->yscroll += count;
1310         if (p->yscroll > p->vrows - vc->vc_rows) {
1311                 p->yscroll -= p->vrows - vc->vc_rows;
1312                 redraw = 1;
1313         }
1314
1315         info->var.xoffset = 0;
1316         info->var.yoffset = p->yscroll * vc->vc_font.height;
1317         info->var.vmode &= ~FB_VMODE_YWRAP;
1318         if (redraw)
1319                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1320         update_var(vc->vc_num, info);
1321         fbcon_clear_margins(vc, 1);
1322         scrollback_max += count;
1323         if (scrollback_max > scrollback_phys_max)
1324                 scrollback_max = scrollback_phys_max;
1325         scrollback_current = 0;
1326 }
1327
1328 static __inline__ void ypan_down(struct vc_data *vc, int count)
1329 {
1330         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1331         struct display *p = &fb_display[vc->vc_num];
1332         struct fbcon_ops *ops = info->fbcon_par;
1333
1334         p->yscroll -= count;
1335         if (p->yscroll < 0) {
1336                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1337                             0, vc->vc_rows, vc->vc_cols);
1338                 p->yscroll += p->vrows - vc->vc_rows;
1339         }
1340         info->var.xoffset = 0;
1341         info->var.yoffset = p->yscroll * vc->vc_font.height;
1342         info->var.vmode &= ~FB_VMODE_YWRAP;
1343         update_var(vc->vc_num, info);
1344         fbcon_clear_margins(vc, 1);
1345         scrollback_max -= count;
1346         if (scrollback_max < 0)
1347                 scrollback_max = 0;
1348         scrollback_current = 0;
1349 }
1350
1351 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1352 {
1353         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1354         struct display *p = &fb_display[vc->vc_num];
1355         int redraw = 0;
1356
1357         p->yscroll -= count;
1358         if (p->yscroll < 0) {
1359                 p->yscroll += p->vrows - vc->vc_rows;
1360                 redraw = 1;
1361         }
1362         info->var.xoffset = 0;
1363         info->var.yoffset = p->yscroll * vc->vc_font.height;
1364         info->var.vmode &= ~FB_VMODE_YWRAP;
1365         if (redraw)
1366                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1367         update_var(vc->vc_num, info);
1368         fbcon_clear_margins(vc, 1);
1369         scrollback_max -= count;
1370         if (scrollback_max < 0)
1371                 scrollback_max = 0;
1372         scrollback_current = 0;
1373 }
1374
1375 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1376                                   long delta)
1377 {
1378         int count = vc->vc_rows;
1379         unsigned short *d, *s;
1380         unsigned long n;
1381         int line = 0;
1382
1383         d = (u16 *) softback_curr;
1384         if (d == (u16 *) softback_in)
1385                 d = (u16 *) vc->vc_origin;
1386         n = softback_curr + delta * vc->vc_size_row;
1387         softback_lines -= delta;
1388         if (delta < 0) {
1389                 if (softback_curr < softback_top && n < softback_buf) {
1390                         n += softback_end - softback_buf;
1391                         if (n < softback_top) {
1392                                 softback_lines -=
1393                                     (softback_top - n) / vc->vc_size_row;
1394                                 n = softback_top;
1395                         }
1396                 } else if (softback_curr >= softback_top
1397                            && n < softback_top) {
1398                         softback_lines -=
1399                             (softback_top - n) / vc->vc_size_row;
1400                         n = softback_top;
1401                 }
1402         } else {
1403                 if (softback_curr > softback_in && n >= softback_end) {
1404                         n += softback_buf - softback_end;
1405                         if (n > softback_in) {
1406                                 n = softback_in;
1407                                 softback_lines = 0;
1408                         }
1409                 } else if (softback_curr <= softback_in && n > softback_in) {
1410                         n = softback_in;
1411                         softback_lines = 0;
1412                 }
1413         }
1414         if (n == softback_curr)
1415                 return;
1416         softback_curr = n;
1417         s = (u16 *) softback_curr;
1418         if (s == (u16 *) softback_in)
1419                 s = (u16 *) vc->vc_origin;
1420         while (count--) {
1421                 unsigned short *start;
1422                 unsigned short *le;
1423                 unsigned short c;
1424                 int x = 0;
1425                 unsigned short attr = 1;
1426
1427                 start = s;
1428                 le = advance_row(s, 1);
1429                 do {
1430                         c = scr_readw(s);
1431                         if (attr != (c & 0xff00)) {
1432                                 attr = c & 0xff00;
1433                                 if (s > start) {
1434                                         fbcon_putcs(vc, start, s - start,
1435                                                     line, x);
1436                                         x += s - start;
1437                                         start = s;
1438                                 }
1439                         }
1440                         if (c == scr_readw(d)) {
1441                                 if (s > start) {
1442                                         fbcon_putcs(vc, start, s - start,
1443                                                     line, x);
1444                                         x += s - start + 1;
1445                                         start = s + 1;
1446                                 } else {
1447                                         x++;
1448                                         start++;
1449                                 }
1450                         }
1451                         s++;
1452                         d++;
1453                 } while (s < le);
1454                 if (s > start)
1455                         fbcon_putcs(vc, start, s - start, line, x);
1456                 line++;
1457                 if (d == (u16 *) softback_end)
1458                         d = (u16 *) softback_buf;
1459                 if (d == (u16 *) softback_in)
1460                         d = (u16 *) vc->vc_origin;
1461                 if (s == (u16 *) softback_end)
1462                         s = (u16 *) softback_buf;
1463                 if (s == (u16 *) softback_in)
1464                         s = (u16 *) vc->vc_origin;
1465         }
1466 }
1467
1468 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1469                               int line, int count, int dy)
1470 {
1471         unsigned short *s = (unsigned short *)
1472                 (vc->vc_origin + vc->vc_size_row * line);
1473
1474         while (count--) {
1475                 unsigned short *start = s;
1476                 unsigned short *le = advance_row(s, 1);
1477                 unsigned short c;
1478                 int x = 0;
1479                 unsigned short attr = 1;
1480
1481                 do {
1482                         c = scr_readw(s);
1483                         if (attr != (c & 0xff00)) {
1484                                 attr = c & 0xff00;
1485                                 if (s > start) {
1486                                         fbcon_putcs(vc, start, s - start,
1487                                                     dy, x);
1488                                         x += s - start;
1489                                         start = s;
1490                                 }
1491                         }
1492                         console_conditional_schedule();
1493                         s++;
1494                 } while (s < le);
1495                 if (s > start)
1496                         fbcon_putcs(vc, start, s - start, dy, x);
1497                 console_conditional_schedule();
1498                 dy++;
1499         }
1500 }
1501
1502 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1503                          int line, int count, int offset)
1504 {
1505         unsigned short *d = (unsigned short *)
1506             (vc->vc_origin + vc->vc_size_row * line);
1507         unsigned short *s = d + offset;
1508
1509         while (count--) {
1510                 unsigned short *start = s;
1511                 unsigned short *le = advance_row(s, 1);
1512                 unsigned short c;
1513                 int x = 0;
1514                 unsigned short attr = 1;
1515
1516                 do {
1517                         c = scr_readw(s);
1518                         if (attr != (c & 0xff00)) {
1519                                 attr = c & 0xff00;
1520                                 if (s > start) {
1521                                         fbcon_putcs(vc, start, s - start,
1522                                                     line, x);
1523                                         x += s - start;
1524                                         start = s;
1525                                 }
1526                         }
1527                         if (c == scr_readw(d)) {
1528                                 if (s > start) {
1529                                         fbcon_putcs(vc, start, s - start,
1530                                                      line, x);
1531                                         x += s - start + 1;
1532                                         start = s + 1;
1533                                 } else {
1534                                         x++;
1535                                         start++;
1536                                 }
1537                         }
1538                         scr_writew(c, d);
1539                         console_conditional_schedule();
1540                         s++;
1541                         d++;
1542                 } while (s < le);
1543                 if (s > start)
1544                         fbcon_putcs(vc, start, s - start, line, x);
1545                 console_conditional_schedule();
1546                 if (offset > 0)
1547                         line++;
1548                 else {
1549                         line--;
1550                         /* NOTE: We subtract two lines from these pointers */
1551                         s -= vc->vc_size_row;
1552                         d -= vc->vc_size_row;
1553                 }
1554         }
1555 }
1556
1557 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1558                                        int count)
1559 {
1560         unsigned short *p;
1561
1562         if (vc->vc_num != fg_console)
1563                 return;
1564         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1565
1566         while (count) {
1567                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1568                 count--;
1569                 p = advance_row(p, 1);
1570                 softback_in += vc->vc_size_row;
1571                 if (softback_in == softback_end)
1572                         softback_in = softback_buf;
1573                 if (softback_in == softback_top) {
1574                         softback_top += vc->vc_size_row;
1575                         if (softback_top == softback_end)
1576                                 softback_top = softback_buf;
1577                 }
1578         }
1579         softback_curr = softback_in;
1580 }
1581
1582 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1583                         int count)
1584 {
1585         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1586         struct display *p = &fb_display[vc->vc_num];
1587         struct fbcon_ops *ops = info->fbcon_par;
1588         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1589
1590         if (fbcon_is_inactive(vc, info))
1591                 return -EINVAL;
1592
1593         fbcon_cursor(vc, CM_ERASE);
1594
1595         /*
1596          * ++Geert: Only use ywrap/ypan if the console is in text mode
1597          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1598          *           whole screen (prevents flicker).
1599          */
1600
1601         switch (dir) {
1602         case SM_UP:
1603                 if (count > vc->vc_rows)        /* Maximum realistic size */
1604                         count = vc->vc_rows;
1605                 if (softback_top)
1606                         fbcon_softback_note(vc, t, count);
1607                 if (logo_shown >= 0)
1608                         goto redraw_up;
1609                 switch (p->scrollmode) {
1610                 case SCROLL_MOVE:
1611                         ops->bmove(vc, info, t + count, 0, t, 0,
1612                                     b - t - count, vc->vc_cols);
1613                         ops->clear(vc, info, b - count, 0, count,
1614                                   vc->vc_cols);
1615                         break;
1616
1617                 case SCROLL_WRAP_MOVE:
1618                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1619                                 if (t > 0)
1620                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1621                                                     vc->vc_cols);
1622                                 ywrap_up(vc, count);
1623                                 if (vc->vc_rows - b > 0)
1624                                         fbcon_bmove(vc, b - count, 0, b, 0,
1625                                                     vc->vc_rows - b,
1626                                                     vc->vc_cols);
1627                         } else if (info->flags & FBINFO_READS_FAST)
1628                                 fbcon_bmove(vc, t + count, 0, t, 0,
1629                                             b - t - count, vc->vc_cols);
1630                         else
1631                                 goto redraw_up;
1632                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1633                         break;
1634
1635                 case SCROLL_PAN_REDRAW:
1636                         if ((p->yscroll + count <=
1637                              2 * (p->vrows - vc->vc_rows))
1638                             && ((!scroll_partial && (b - t == vc->vc_rows))
1639                                 || (scroll_partial
1640                                     && (b - t - count >
1641                                         3 * vc->vc_rows >> 2)))) {
1642                                 if (t > 0)
1643                                         fbcon_redraw_move(vc, p, 0, t, count);
1644                                 ypan_up_redraw(vc, t, count);
1645                                 if (vc->vc_rows - b > 0)
1646                                         fbcon_redraw_move(vc, p, b - count,
1647                                                           vc->vc_rows - b, b);
1648                         } else
1649                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1650                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1651                         break;
1652
1653                 case SCROLL_PAN_MOVE:
1654                         if ((p->yscroll + count <=
1655                              2 * (p->vrows - vc->vc_rows))
1656                             && ((!scroll_partial && (b - t == vc->vc_rows))
1657                                 || (scroll_partial
1658                                     && (b - t - count >
1659                                         3 * vc->vc_rows >> 2)))) {
1660                                 if (t > 0)
1661                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1662                                                     vc->vc_cols);
1663                                 ypan_up(vc, count);
1664                                 if (vc->vc_rows - b > 0)
1665                                         fbcon_bmove(vc, b - count, 0, b, 0,
1666                                                     vc->vc_rows - b,
1667                                                     vc->vc_cols);
1668                         } else if (info->flags & FBINFO_READS_FAST)
1669                                 fbcon_bmove(vc, t + count, 0, t, 0,
1670                                             b - t - count, vc->vc_cols);
1671                         else
1672                                 goto redraw_up;
1673                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1674                         break;
1675
1676                 case SCROLL_REDRAW:
1677                       redraw_up:
1678                         fbcon_redraw(vc, p, t, b - t - count,
1679                                      count * vc->vc_cols);
1680                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1681                         scr_memsetw((unsigned short *) (vc->vc_origin +
1682                                                         vc->vc_size_row *
1683                                                         (b - count)),
1684                                     vc->vc_video_erase_char,
1685                                     vc->vc_size_row * count);
1686                         return 1;
1687                 }
1688                 break;
1689
1690         case SM_DOWN:
1691                 if (count > vc->vc_rows)        /* Maximum realistic size */
1692                         count = vc->vc_rows;
1693                 if (logo_shown >= 0)
1694                         goto redraw_down;
1695                 switch (p->scrollmode) {
1696                 case SCROLL_MOVE:
1697                         ops->bmove(vc, info, t, 0, t + count, 0,
1698                                     b - t - count, vc->vc_cols);
1699                         ops->clear(vc, info, t, 0, count, vc->vc_cols);
1700                         break;
1701
1702                 case SCROLL_WRAP_MOVE:
1703                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1704                                 if (vc->vc_rows - b > 0)
1705                                         fbcon_bmove(vc, b, 0, b - count, 0,
1706                                                     vc->vc_rows - b,
1707                                                     vc->vc_cols);
1708                                 ywrap_down(vc, count);
1709                                 if (t > 0)
1710                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1711                                                     vc->vc_cols);
1712                         } else if (info->flags & FBINFO_READS_FAST)
1713                                 fbcon_bmove(vc, t, 0, t + count, 0,
1714                                             b - t - count, vc->vc_cols);
1715                         else
1716                                 goto redraw_down;
1717                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1718                         break;
1719
1720                 case SCROLL_PAN_MOVE:
1721                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1722                             && ((!scroll_partial && (b - t == vc->vc_rows))
1723                                 || (scroll_partial
1724                                     && (b - t - count >
1725                                         3 * vc->vc_rows >> 2)))) {
1726                                 if (vc->vc_rows - b > 0)
1727                                         fbcon_bmove(vc, b, 0, b - count, 0,
1728                                                     vc->vc_rows - b,
1729                                                     vc->vc_cols);
1730                                 ypan_down(vc, count);
1731                                 if (t > 0)
1732                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1733                                                     vc->vc_cols);
1734                         } else if (info->flags & FBINFO_READS_FAST)
1735                                 fbcon_bmove(vc, t, 0, t + count, 0,
1736                                             b - t - count, vc->vc_cols);
1737                         else
1738                                 goto redraw_down;
1739                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1740                         break;
1741
1742                 case SCROLL_PAN_REDRAW:
1743                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1744                             && ((!scroll_partial && (b - t == vc->vc_rows))
1745                                 || (scroll_partial
1746                                     && (b - t - count >
1747                                         3 * vc->vc_rows >> 2)))) {
1748                                 if (vc->vc_rows - b > 0)
1749                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1750                                                           b - count);
1751                                 ypan_down_redraw(vc, t, count);
1752                                 if (t > 0)
1753                                         fbcon_redraw_move(vc, p, count, t, 0);
1754                         } else
1755                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1756                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1757                         break;
1758
1759                 case SCROLL_REDRAW:
1760                       redraw_down:
1761                         fbcon_redraw(vc, p, b - 1, b - t - count,
1762                                      -count * vc->vc_cols);
1763                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1764                         scr_memsetw((unsigned short *) (vc->vc_origin +
1765                                                         vc->vc_size_row *
1766                                                         t),
1767                                     vc->vc_video_erase_char,
1768                                     vc->vc_size_row * count);
1769                         return 1;
1770                 }
1771         }
1772         return 0;
1773 }
1774
1775
1776 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1777                         int height, int width)
1778 {
1779         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1780         struct display *p = &fb_display[vc->vc_num];
1781
1782         if (fbcon_is_inactive(vc, info))
1783                 return;
1784
1785         if (!width || !height)
1786                 return;
1787
1788         /*  Split blits that cross physical y_wrap case.
1789          *  Pathological case involves 4 blits, better to use recursive
1790          *  code rather than unrolled case
1791          *
1792          *  Recursive invocations don't need to erase the cursor over and
1793          *  over again, so we use fbcon_bmove_rec()
1794          */
1795         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1796                         p->vrows - p->yscroll);
1797 }
1798
1799 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
1800                             int dy, int dx, int height, int width, u_int y_break)
1801 {
1802         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1803         struct fbcon_ops *ops = info->fbcon_par;
1804         u_int b;
1805
1806         if (sy < y_break && sy + height > y_break) {
1807                 b = y_break - sy;
1808                 if (dy < sy) {  /* Avoid trashing self */
1809                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1810                                         y_break);
1811                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1812                                         height - b, width, y_break);
1813                 } else {
1814                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1815                                         height - b, width, y_break);
1816                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1817                                         y_break);
1818                 }
1819                 return;
1820         }
1821
1822         if (dy < y_break && dy + height > y_break) {
1823                 b = y_break - dy;
1824                 if (dy < sy) {  /* Avoid trashing self */
1825                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1826                                         y_break);
1827                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1828                                         height - b, width, y_break);
1829                 } else {
1830                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1831                                         height - b, width, y_break);
1832                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1833                                         y_break);
1834                 }
1835                 return;
1836         }
1837         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1838                    height, width);
1839 }
1840
1841 static __inline__ void updatescrollmode(struct display *p, struct fb_info *info,
1842                                         struct vc_data *vc)
1843 {
1844         int fh = vc->vc_font.height;
1845         int cap = info->flags;
1846         int good_pan = (cap & FBINFO_HWACCEL_YPAN)
1847                  && divides(info->fix.ypanstep, vc->vc_font.height)
1848                  && info->var.yres_virtual > info->var.yres;
1849         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP)
1850                  && divides(info->fix.ywrapstep, vc->vc_font.height)
1851                  && divides(vc->vc_font.height, info->var.yres_virtual);
1852         int reading_fast = cap & FBINFO_READS_FAST;
1853         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) && !(cap & FBINFO_HWACCEL_DISABLED);
1854         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) && !(cap & FBINFO_HWACCEL_DISABLED);
1855
1856         p->vrows = info->var.yres_virtual/fh;
1857         if (info->var.yres > (fh * (vc->vc_rows + 1)))
1858                 p->vrows -= (info->var.yres - (fh * vc->vc_rows)) / fh;
1859         if ((info->var.yres % fh) && (info->var.yres_virtual % fh <
1860                                       info->var.yres % fh))
1861                 p->vrows--;
1862
1863         if (good_wrap || good_pan) {
1864                 if (reading_fast || fast_copyarea)
1865                         p->scrollmode = good_wrap ? SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
1866                 else
1867                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
1868                                 SCROLL_PAN_REDRAW;
1869         } else {
1870                 if (reading_fast || (fast_copyarea && !fast_imageblit))
1871                         p->scrollmode = SCROLL_MOVE;
1872                 else
1873                         p->scrollmode = SCROLL_REDRAW;
1874         }
1875 }
1876
1877 static int fbcon_resize(struct vc_data *vc, unsigned int width,
1878                         unsigned int height)
1879 {
1880         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1881         struct display *p = &fb_display[vc->vc_num];
1882         struct fb_var_screeninfo var = info->var;
1883         int x_diff, y_diff;
1884         int fw = vc->vc_font.width;
1885         int fh = vc->vc_font.height;
1886
1887         var.xres = width * fw;
1888         var.yres = height * fh;
1889         x_diff = info->var.xres - var.xres;
1890         y_diff = info->var.yres - var.yres;
1891         if (x_diff < 0 || x_diff > fw || (y_diff < 0 || y_diff > fh)) {
1892                 struct fb_videomode *mode;
1893
1894                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
1895                 mode = fb_find_best_mode(&var, &info->modelist);
1896                 if (mode == NULL)
1897                         return -EINVAL;
1898                 display_to_var(&var, p);
1899                 fb_videomode_to_var(&var, mode);
1900
1901                 if (width > var.xres/fw || height > var.yres/fh)
1902                         return -EINVAL;
1903
1904                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
1905                 if (CON_IS_VISIBLE(vc)) {
1906                         var.activate = FB_ACTIVATE_NOW |
1907                                 FB_ACTIVATE_FORCE;
1908                         fb_set_var(info, &var);
1909                 }
1910                 var_to_display(p, &info->var, info);
1911         }
1912         updatescrollmode(p, info, vc);
1913         return 0;
1914 }
1915
1916 static int fbcon_switch(struct vc_data *vc)
1917 {
1918         struct fb_info *info, *old_info = NULL;
1919         struct display *p = &fb_display[vc->vc_num];
1920         struct fb_var_screeninfo var;
1921         int i, prev_console;
1922
1923         info = registered_fb[con2fb_map[vc->vc_num]];
1924
1925         if (softback_top) {
1926                 if (softback_lines)
1927                         fbcon_set_origin(vc);
1928                 softback_top = softback_curr = softback_in = softback_buf;
1929                 softback_lines = 0;
1930                 fbcon_update_softback(vc);
1931         }
1932
1933         if (logo_shown >= 0) {
1934                 struct vc_data *conp2 = vc_cons[logo_shown].d;
1935
1936                 if (conp2->vc_top == logo_lines
1937                     && conp2->vc_bottom == conp2->vc_rows)
1938                         conp2->vc_top = 0;
1939                 logo_shown = FBCON_LOGO_CANSHOW;
1940         }
1941
1942         prev_console = ((struct fbcon_ops *)info->fbcon_par)->currcon;
1943         if (prev_console != -1)
1944                 old_info = registered_fb[con2fb_map[prev_console]];
1945         /*
1946          * FIXME: If we have multiple fbdev's loaded, we need to
1947          * update all info->currcon.  Perhaps, we can place this
1948          * in a centralized structure, but this might break some
1949          * drivers.
1950          *
1951          * info->currcon = vc->vc_num;
1952          */
1953         for (i = 0; i < FB_MAX; i++) {
1954                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
1955                         struct fbcon_ops *ops = registered_fb[i]->fbcon_par;
1956
1957                         ops->currcon = vc->vc_num;
1958                 }
1959         }
1960         memset(&var, 0, sizeof(struct fb_var_screeninfo));
1961         display_to_var(&var, p);
1962         var.activate = FB_ACTIVATE_NOW;
1963
1964         /*
1965          * make sure we don't unnecessarily trip the memcmp()
1966          * in fb_set_var()
1967          */
1968         info->var.activate = var.activate;
1969         info->var.yoffset = info->var.xoffset = p->yscroll = 0;
1970         fb_set_var(info, &var);
1971
1972         if (old_info != NULL && old_info != info) {
1973                 if (info->fbops->fb_set_par)
1974                         info->fbops->fb_set_par(info);
1975                 fbcon_del_cursor_timer(old_info);
1976                 fbcon_add_cursor_timer(info);
1977         }
1978
1979         set_blitting_type(vc, info, p);
1980         ((struct fbcon_ops *)info->fbcon_par)->cursor_reset = 1;
1981
1982         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1983         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1984         updatescrollmode(p, info, vc);
1985
1986         switch (p->scrollmode) {
1987         case SCROLL_WRAP_MOVE:
1988                 scrollback_phys_max = p->vrows - vc->vc_rows;
1989                 break;
1990         case SCROLL_PAN_MOVE:
1991         case SCROLL_PAN_REDRAW:
1992                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
1993                 if (scrollback_phys_max < 0)
1994                         scrollback_phys_max = 0;
1995                 break;
1996         default:
1997                 scrollback_phys_max = 0;
1998                 break;
1999         }
2000         scrollback_max = 0;
2001         scrollback_current = 0;
2002
2003         update_var(vc->vc_num, info);
2004         fbcon_set_palette(vc, color_table);
2005         fbcon_clear_margins(vc, 0);
2006
2007         if (logo_shown == FBCON_LOGO_DRAW) {
2008
2009                 logo_shown = fg_console;
2010                 /* This is protected above by initmem_freed */
2011                 fb_show_logo(info);
2012                 update_region(vc,
2013                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2014                               vc->vc_size_row * (vc->vc_bottom -
2015                                                  vc->vc_top) / 2);
2016                 return 0;
2017         }
2018         return 1;
2019 }
2020
2021 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2022                                 int blank)
2023 {
2024         if (blank) {
2025                 unsigned short charmask = vc->vc_hi_font_mask ?
2026                         0x1ff : 0xff;
2027                 unsigned short oldc;
2028
2029                 oldc = vc->vc_video_erase_char;
2030                 vc->vc_video_erase_char &= charmask;
2031                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2032                 vc->vc_video_erase_char = oldc;
2033         }
2034 }
2035
2036 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2037 {
2038         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2039         struct fbcon_ops *ops = info->fbcon_par;
2040
2041         if (mode_switch) {
2042                 struct fb_var_screeninfo var = info->var;
2043
2044                 ops->graphics = 1;
2045
2046                 if (!blank) {
2047                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2048                         fb_set_var(info, &var);
2049                         ops->graphics = 0;
2050                 }
2051         }
2052
2053         if (!fbcon_is_inactive(vc, info)) {
2054                 if (ops->blank_state != blank) {
2055                         ops->blank_state = blank;
2056                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2057                         ops->cursor_flash = (!blank);
2058
2059                         if (fb_blank(info, blank))
2060                                 fbcon_generic_blank(vc, info, blank);
2061                 }
2062
2063                 if (!blank)
2064                         update_screen(vc);
2065         }
2066
2067         if (!blank)
2068                 fbcon_add_cursor_timer(info);
2069         else
2070                 fbcon_del_cursor_timer(info);
2071
2072         return 0;
2073 }
2074
2075 static void fbcon_free_font(struct display *p)
2076 {
2077         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
2078                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
2079         p->fontdata = NULL;
2080         p->userfont = 0;
2081 }
2082
2083 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2084 {
2085         u8 *fontdata = vc->vc_font.data;
2086         u8 *data = font->data;
2087         int i, j;
2088
2089         font->width = vc->vc_font.width;
2090         font->height = vc->vc_font.height;
2091         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2092         if (!font->data)
2093                 return 0;
2094
2095         if (font->width <= 8) {
2096                 j = vc->vc_font.height;
2097                 for (i = 0; i < font->charcount; i++) {
2098                         memcpy(data, fontdata, j);
2099                         memset(data + j, 0, 32 - j);
2100                         data += 32;
2101                         fontdata += j;
2102                 }
2103         } else if (font->width <= 16) {
2104                 j = vc->vc_font.height * 2;
2105                 for (i = 0; i < font->charcount; i++) {
2106                         memcpy(data, fontdata, j);
2107                         memset(data + j, 0, 64 - j);
2108                         data += 64;
2109                         fontdata += j;
2110                 }
2111         } else if (font->width <= 24) {
2112                 for (i = 0; i < font->charcount; i++) {
2113                         for (j = 0; j < vc->vc_font.height; j++) {
2114                                 *data++ = fontdata[0];
2115                                 *data++ = fontdata[1];
2116                                 *data++ = fontdata[2];
2117                                 fontdata += sizeof(u32);
2118                         }
2119                         memset(data, 0, 3 * (32 - j));
2120                         data += 3 * (32 - j);
2121                 }
2122         } else {
2123                 j = vc->vc_font.height * 4;
2124                 for (i = 0; i < font->charcount; i++) {
2125                         memcpy(data, fontdata, j);
2126                         memset(data + j, 0, 128 - j);
2127                         data += 128;
2128                         fontdata += j;
2129                 }
2130         }
2131         return 0;
2132 }
2133
2134 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2135                              const u8 * data, int userfont)
2136 {
2137         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2138         struct display *p = &fb_display[vc->vc_num];
2139         int resize;
2140         int cnt;
2141         char *old_data = NULL;
2142
2143         if (CON_IS_VISIBLE(vc) && softback_lines)
2144                 fbcon_set_origin(vc);
2145
2146         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2147         if (p->userfont)
2148                 old_data = vc->vc_font.data;
2149         if (userfont)
2150                 cnt = FNTCHARCNT(data);
2151         else
2152                 cnt = 256;
2153         vc->vc_font.data = (void *)(p->fontdata = data);
2154         if ((p->userfont = userfont))
2155                 REFCOUNT(data)++;
2156         vc->vc_font.width = w;
2157         vc->vc_font.height = h;
2158         if (vc->vc_hi_font_mask && cnt == 256) {
2159                 vc->vc_hi_font_mask = 0;
2160                 if (vc->vc_can_do_color) {
2161                         vc->vc_complement_mask >>= 1;
2162                         vc->vc_s_complement_mask >>= 1;
2163                 }
2164
2165                 /* ++Edmund: reorder the attribute bits */
2166                 if (vc->vc_can_do_color) {
2167                         unsigned short *cp =
2168                             (unsigned short *) vc->vc_origin;
2169                         int count = vc->vc_screenbuf_size / 2;
2170                         unsigned short c;
2171                         for (; count > 0; count--, cp++) {
2172                                 c = scr_readw(cp);
2173                                 scr_writew(((c & 0xfe00) >> 1) |
2174                                            (c & 0xff), cp);
2175                         }
2176                         c = vc->vc_video_erase_char;
2177                         vc->vc_video_erase_char =
2178                             ((c & 0xfe00) >> 1) | (c & 0xff);
2179                         vc->vc_attr >>= 1;
2180                 }
2181         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2182                 vc->vc_hi_font_mask = 0x100;
2183                 if (vc->vc_can_do_color) {
2184                         vc->vc_complement_mask <<= 1;
2185                         vc->vc_s_complement_mask <<= 1;
2186                 }
2187
2188                 /* ++Edmund: reorder the attribute bits */
2189                 {
2190                         unsigned short *cp =
2191                             (unsigned short *) vc->vc_origin;
2192                         int count = vc->vc_screenbuf_size / 2;
2193                         unsigned short c;
2194                         for (; count > 0; count--, cp++) {
2195                                 unsigned short newc;
2196                                 c = scr_readw(cp);
2197                                 if (vc->vc_can_do_color)
2198                                         newc =
2199                                             ((c & 0xff00) << 1) | (c &
2200                                                                    0xff);
2201                                 else
2202                                         newc = c & ~0x100;
2203                                 scr_writew(newc, cp);
2204                         }
2205                         c = vc->vc_video_erase_char;
2206                         if (vc->vc_can_do_color) {
2207                                 vc->vc_video_erase_char =
2208                                     ((c & 0xff00) << 1) | (c & 0xff);
2209                                 vc->vc_attr <<= 1;
2210                         } else
2211                                 vc->vc_video_erase_char = c & ~0x100;
2212                 }
2213
2214         }
2215
2216         if (resize) {
2217                 /* reset wrap/pan */
2218                 info->var.xoffset = info->var.yoffset = p->yscroll = 0;
2219                 vc_resize(vc, info->var.xres / w, info->var.yres / h);
2220                 if (CON_IS_VISIBLE(vc) && softback_buf)
2221                         fbcon_update_softback(vc);
2222         } else if (CON_IS_VISIBLE(vc)
2223                    && vc->vc_mode == KD_TEXT) {
2224                 fbcon_clear_margins(vc, 0);
2225                 update_screen(vc);
2226         }
2227
2228         if (old_data && (--REFCOUNT(old_data) == 0))
2229                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2230         return 0;
2231 }
2232
2233 static int fbcon_copy_font(struct vc_data *vc, int con)
2234 {
2235         struct display *od = &fb_display[con];
2236         struct console_font *f = &vc->vc_font;
2237
2238         if (od->fontdata == f->data)
2239                 return 0;       /* already the same font... */
2240         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2241 }
2242
2243 /*
2244  *  User asked to set font; we are guaranteed that
2245  *      a) width and height are in range 1..32
2246  *      b) charcount does not exceed 512
2247  *  but lets not assume that, since someone might someday want to use larger
2248  *  fonts. And charcount of 512 is small for unicode support.
2249  *
2250  *  However, user space gives the font in 32 rows , regardless of
2251  *  actual font height. So a new API is needed if support for larger fonts
2252  *  is ever implemented.
2253  */
2254
2255 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2256 {
2257         unsigned charcount = font->charcount;
2258         int w = font->width;
2259         int h = font->height;
2260         int size;
2261         int i, csum;
2262         u8 *new_data, *data = font->data;
2263         int pitch = (font->width+7) >> 3;
2264
2265         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2266          * If not this check should be changed to charcount < 256 */
2267         if (charcount != 256 && charcount != 512)
2268                 return -EINVAL;
2269
2270         size = h * pitch * charcount;
2271
2272         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2273
2274         if (!new_data)
2275                 return -ENOMEM;
2276
2277         new_data += FONT_EXTRA_WORDS * sizeof(int);
2278         FNTSIZE(new_data) = size;
2279         FNTCHARCNT(new_data) = charcount;
2280         REFCOUNT(new_data) = 0; /* usage counter */
2281         for (i=0; i< charcount; i++) {
2282                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2283         }
2284
2285         /* Since linux has a nice crc32 function use it for counting font
2286          * checksums. */
2287         csum = crc32(0, new_data, size);
2288
2289         FNTSUM(new_data) = csum;
2290         /* Check if the same font is on some other console already */
2291         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2292                 struct vc_data *tmp = vc_cons[i].d;
2293
2294                 if (fb_display[i].userfont &&
2295                     fb_display[i].fontdata &&
2296                     FNTSUM(fb_display[i].fontdata) == csum &&
2297                     FNTSIZE(fb_display[i].fontdata) == size &&
2298                     tmp->vc_font.width == w &&
2299                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2300                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2301                         new_data = (u8 *)fb_display[i].fontdata;
2302                         break;
2303                 }
2304         }
2305         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2306 }
2307
2308 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2309 {
2310         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2311         const struct font_desc *f;
2312
2313         if (!name)
2314                 f = get_default_font(info->var.xres, info->var.yres);
2315         else if (!(f = find_font(name)))
2316                 return -ENOENT;
2317
2318         font->width = f->width;
2319         font->height = f->height;
2320         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2321 }
2322
2323 static u16 palette_red[16];
2324 static u16 palette_green[16];
2325 static u16 palette_blue[16];
2326
2327 static struct fb_cmap palette_cmap = {
2328         0, 16, palette_red, palette_green, palette_blue, NULL
2329 };
2330
2331 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
2332 {
2333         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2334         int i, j, k, depth;
2335         u8 val;
2336
2337         if (fbcon_is_inactive(vc, info))
2338                 return -EINVAL;
2339
2340         if (!CON_IS_VISIBLE(vc))
2341                 return 0;
2342
2343         depth = fb_get_color_depth(&info->var, &info->fix);
2344         if (depth > 3) {
2345                 for (i = j = 0; i < 16; i++) {
2346                         k = table[i];
2347                         val = vc->vc_palette[j++];
2348                         palette_red[k] = (val << 8) | val;
2349                         val = vc->vc_palette[j++];
2350                         palette_green[k] = (val << 8) | val;
2351                         val = vc->vc_palette[j++];
2352                         palette_blue[k] = (val << 8) | val;
2353                 }
2354                 palette_cmap.len = 16;
2355                 palette_cmap.start = 0;
2356         /*
2357          * If framebuffer is capable of less than 16 colors,
2358          * use default palette of fbcon.
2359          */
2360         } else
2361                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2362
2363         return fb_set_cmap(&palette_cmap, info);
2364 }
2365
2366 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2367 {
2368         unsigned long p;
2369         int line;
2370
2371         if (vc->vc_num != fg_console || !softback_lines)
2372                 return (u16 *) (vc->vc_origin + offset);
2373         line = offset / vc->vc_size_row;
2374         if (line >= softback_lines)
2375                 return (u16 *) (vc->vc_origin + offset -
2376                                 softback_lines * vc->vc_size_row);
2377         p = softback_curr + offset;
2378         if (p >= softback_end)
2379                 p += softback_buf - softback_end;
2380         return (u16 *) p;
2381 }
2382
2383 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2384                                  int *px, int *py)
2385 {
2386         unsigned long ret;
2387         int x, y;
2388
2389         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2390                 unsigned long offset = (pos - vc->vc_origin) / 2;
2391
2392                 x = offset % vc->vc_cols;
2393                 y = offset / vc->vc_cols;
2394                 if (vc->vc_num == fg_console)
2395                         y += softback_lines;
2396                 ret = pos + (vc->vc_cols - x) * 2;
2397         } else if (vc->vc_num == fg_console && softback_lines) {
2398                 unsigned long offset = pos - softback_curr;
2399
2400                 if (pos < softback_curr)
2401                         offset += softback_end - softback_buf;
2402                 offset /= 2;
2403                 x = offset % vc->vc_cols;
2404                 y = offset / vc->vc_cols;
2405                 ret = pos + (vc->vc_cols - x) * 2;
2406                 if (ret == softback_end)
2407                         ret = softback_buf;
2408                 if (ret == softback_in)
2409                         ret = vc->vc_origin;
2410         } else {
2411                 /* Should not happen */
2412                 x = y = 0;
2413                 ret = vc->vc_origin;
2414         }
2415         if (px)
2416                 *px = x;
2417         if (py)
2418                 *py = y;
2419         return ret;
2420 }
2421
2422 /* As we might be inside of softback, we may work with non-contiguous buffer,
2423    that's why we have to use a separate routine. */
2424 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2425 {
2426         while (cnt--) {
2427                 u16 a = scr_readw(p);
2428                 if (!vc->vc_can_do_color)
2429                         a ^= 0x0800;
2430                 else if (vc->vc_hi_font_mask == 0x100)
2431                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2432                             (((a) & 0x0e00) << 4);
2433                 else
2434                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2435                             (((a) & 0x0700) << 4);
2436                 scr_writew(a, p++);
2437                 if (p == (u16 *) softback_end)
2438                         p = (u16 *) softback_buf;
2439                 if (p == (u16 *) softback_in)
2440                         p = (u16 *) vc->vc_origin;
2441         }
2442 }
2443
2444 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
2445 {
2446         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2447         struct display *p = &fb_display[fg_console];
2448         int offset, limit, scrollback_old;
2449
2450         if (softback_top) {
2451                 if (vc->vc_num != fg_console)
2452                         return 0;
2453                 if (vc->vc_mode != KD_TEXT || !lines)
2454                         return 0;
2455                 if (logo_shown >= 0) {
2456                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2457
2458                         if (conp2->vc_top == logo_lines
2459                             && conp2->vc_bottom == conp2->vc_rows)
2460                                 conp2->vc_top = 0;
2461                         if (logo_shown == vc->vc_num) {
2462                                 unsigned long p, q;
2463                                 int i;
2464
2465                                 p = softback_in;
2466                                 q = vc->vc_origin +
2467                                     logo_lines * vc->vc_size_row;
2468                                 for (i = 0; i < logo_lines; i++) {
2469                                         if (p == softback_top)
2470                                                 break;
2471                                         if (p == softback_buf)
2472                                                 p = softback_end;
2473                                         p -= vc->vc_size_row;
2474                                         q -= vc->vc_size_row;
2475                                         scr_memcpyw((u16 *) q, (u16 *) p,
2476                                                     vc->vc_size_row);
2477                                 }
2478                                 softback_in = p;
2479                                 update_region(vc, vc->vc_origin,
2480                                               logo_lines * vc->vc_cols);
2481                         }
2482                         logo_shown = FBCON_LOGO_CANSHOW;
2483                 }
2484                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2485                 fbcon_redraw_softback(vc, p, lines);
2486                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2487                 return 0;
2488         }
2489
2490         if (!scrollback_phys_max)
2491                 return -ENOSYS;
2492
2493         scrollback_old = scrollback_current;
2494         scrollback_current -= lines;
2495         if (scrollback_current < 0)
2496                 scrollback_current = 0;
2497         else if (scrollback_current > scrollback_max)
2498                 scrollback_current = scrollback_max;
2499         if (scrollback_current == scrollback_old)
2500                 return 0;
2501
2502         if (fbcon_is_inactive(vc, info))
2503                 return 0;
2504
2505         fbcon_cursor(vc, CM_ERASE);
2506
2507         offset = p->yscroll - scrollback_current;
2508         limit = p->vrows;
2509         switch (p->scrollmode) {
2510         case SCROLL_WRAP_MOVE:
2511                 info->var.vmode |= FB_VMODE_YWRAP;
2512                 break;
2513         case SCROLL_PAN_MOVE:
2514         case SCROLL_PAN_REDRAW:
2515                 limit -= vc->vc_rows;
2516                 info->var.vmode &= ~FB_VMODE_YWRAP;
2517                 break;
2518         }
2519         if (offset < 0)
2520                 offset += limit;
2521         else if (offset >= limit)
2522                 offset -= limit;
2523         info->var.xoffset = 0;
2524         info->var.yoffset = offset * vc->vc_font.height;
2525         update_var(vc->vc_num, info);
2526         if (!scrollback_current)
2527                 fbcon_cursor(vc, CM_DRAW);
2528         return 0;
2529 }
2530
2531 static int fbcon_set_origin(struct vc_data *vc)
2532 {
2533         if (softback_lines)
2534                 fbcon_scrolldelta(vc, softback_lines);
2535         return 0;
2536 }
2537
2538 static void fbcon_suspended(struct fb_info *info)
2539 {
2540         struct vc_data *vc = NULL;
2541         struct fbcon_ops *ops = info->fbcon_par;
2542
2543         if (!ops || ops->currcon < 0)
2544                 return;
2545         vc = vc_cons[ops->currcon].d;
2546
2547         /* Clear cursor, restore saved data */
2548         fbcon_cursor(vc, CM_ERASE);
2549 }
2550
2551 static void fbcon_resumed(struct fb_info *info)
2552 {
2553         struct vc_data *vc;
2554         struct fbcon_ops *ops = info->fbcon_par;
2555
2556         if (!ops || ops->currcon < 0)
2557                 return;
2558         vc = vc_cons[ops->currcon].d;
2559
2560         update_screen(vc);
2561 }
2562
2563 static void fbcon_modechanged(struct fb_info *info)
2564 {
2565         struct fbcon_ops *ops = info->fbcon_par;
2566         struct vc_data *vc;
2567         struct display *p;
2568         int rows, cols;
2569
2570         if (!ops || ops->currcon < 0)
2571                 return;
2572         vc = vc_cons[ops->currcon].d;
2573         if (vc->vc_mode != KD_TEXT || registered_fb[con2fb_map[ops->currcon]] != info)
2574                 return;
2575
2576         p = &fb_display[vc->vc_num];
2577
2578         info->var.xoffset = info->var.yoffset = p->yscroll = 0;
2579
2580         if (CON_IS_VISIBLE(vc)) {
2581                 var_to_display(p, &info->var, info);
2582                 cols = info->var.xres / vc->vc_font.width;
2583                 rows = info->var.yres / vc->vc_font.height;
2584                 vc_resize(vc, cols, rows);
2585                 updatescrollmode(p, info, vc);
2586                 scrollback_max = 0;
2587                 scrollback_current = 0;
2588                 update_var(vc->vc_num, info);
2589                 fbcon_set_palette(vc, color_table);
2590                 update_screen(vc);
2591                 if (softback_buf)
2592                         fbcon_update_softback(vc);
2593         }
2594 }
2595
2596 static void fbcon_set_all_vcs(struct fb_info *info)
2597 {
2598         struct fbcon_ops *ops = info->fbcon_par;
2599         struct vc_data *vc;
2600         struct display *p;
2601         int i, rows, cols;
2602
2603         if (!ops || ops->currcon < 0)
2604                 return;
2605
2606         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2607                 vc = vc_cons[i].d;
2608                 if (!vc || vc->vc_mode != KD_TEXT ||
2609                     registered_fb[con2fb_map[i]] != info)
2610                         continue;
2611
2612                 p = &fb_display[vc->vc_num];
2613
2614                 info->var.xoffset = info->var.yoffset = p->yscroll = 0;
2615                 var_to_display(p, &info->var, info);
2616                 cols = info->var.xres / vc->vc_font.width;
2617                 rows = info->var.yres / vc->vc_font.height;
2618                 vc_resize(vc, cols, rows);
2619
2620                 if (CON_IS_VISIBLE(vc)) {
2621                         updatescrollmode(p, info, vc);
2622                         scrollback_max = 0;
2623                         scrollback_current = 0;
2624                         update_var(vc->vc_num, info);
2625                         fbcon_set_palette(vc, color_table);
2626                         update_screen(vc);
2627                         if (softback_buf)
2628                                 fbcon_update_softback(vc);
2629                 }
2630         }
2631 }
2632
2633 static int fbcon_mode_deleted(struct fb_info *info,
2634                               struct fb_videomode *mode)
2635 {
2636         struct fb_info *fb_info;
2637         struct display *p;
2638         int i, j, found = 0;
2639
2640         /* before deletion, ensure that mode is not in use */
2641         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2642                 j = con2fb_map[i];
2643                 if (j == -1)
2644                         continue;
2645                 fb_info = registered_fb[j];
2646                 if (fb_info != info)
2647                         continue;
2648                 p = &fb_display[i];
2649                 if (!p || !p->mode)
2650                         continue;
2651                 if (fb_mode_is_equal(p->mode, mode)) {
2652                         found = 1;
2653                         break;
2654                 }
2655         }
2656         return found;
2657 }
2658
2659 static int fbcon_fb_registered(int idx)
2660 {
2661         int ret = 0, i;
2662
2663         if (info_idx == -1) {
2664                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2665                         if (con2fb_map_boot[i] == idx) {
2666                                 info_idx = idx;
2667                                 break;
2668                         }
2669                 }
2670                 if (info_idx != -1)
2671                         ret = fbcon_takeover(1);
2672         } else {
2673                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2674                         if (con2fb_map_boot[i] == idx)
2675                                 set_con2fb_map(i, idx, 0);
2676                 }
2677         }
2678
2679         return ret;
2680 }
2681
2682 static void fbcon_fb_blanked(struct fb_info *info, int blank)
2683 {
2684         struct fbcon_ops *ops = info->fbcon_par;
2685         struct vc_data *vc;
2686
2687         if (!ops || ops->currcon < 0)
2688                 return;
2689
2690         vc = vc_cons[ops->currcon].d;
2691         if (vc->vc_mode != KD_TEXT ||
2692                         registered_fb[con2fb_map[ops->currcon]] != info)
2693                 return;
2694
2695         if (CON_IS_VISIBLE(vc)) {
2696                 if (blank)
2697                         do_blank_screen(0);
2698                 else
2699                         do_unblank_screen(0);
2700         }
2701         ops->blank_state = blank;
2702 }
2703
2704 static void fbcon_new_modelist(struct fb_info *info)
2705 {
2706         int i;
2707         struct vc_data *vc;
2708         struct fb_var_screeninfo var;
2709         struct fb_videomode *mode;
2710
2711         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2712                 if (registered_fb[con2fb_map[i]] != info)
2713                         continue;
2714                 if (!fb_display[i].mode)
2715                         continue;
2716                 vc = vc_cons[i].d;
2717                 display_to_var(&var, &fb_display[i]);
2718                 mode = fb_find_nearest_mode(&var, &info->modelist);
2719                 fb_videomode_to_var(&var, mode);
2720
2721                 if (vc)
2722                         fbcon_set_disp(info, &var, vc);
2723                 else
2724                         fbcon_preset_disp(info, &var, i);
2725
2726         }
2727 }
2728
2729 static int fbcon_event_notify(struct notifier_block *self,
2730                               unsigned long action, void *data)
2731 {
2732         struct fb_event *event = data;
2733         struct fb_info *info = event->info;
2734         struct fb_videomode *mode;
2735         struct fb_con2fbmap *con2fb;
2736         int ret = 0;
2737
2738         switch(action) {
2739         case FB_EVENT_SUSPEND:
2740                 fbcon_suspended(info);
2741                 break;
2742         case FB_EVENT_RESUME:
2743                 fbcon_resumed(info);
2744                 break;
2745         case FB_EVENT_MODE_CHANGE:
2746                 fbcon_modechanged(info);
2747                 break;
2748         case FB_EVENT_MODE_CHANGE_ALL:
2749                 fbcon_set_all_vcs(info);
2750                 break;
2751         case FB_EVENT_MODE_DELETE:
2752                 mode = event->data;
2753                 ret = fbcon_mode_deleted(info, mode);
2754                 break;
2755         case FB_EVENT_FB_REGISTERED:
2756                 ret = fbcon_fb_registered(info->node);
2757                 break;
2758         case FB_EVENT_SET_CONSOLE_MAP:
2759                 con2fb = event->data;
2760                 ret = set_con2fb_map(con2fb->console - 1,
2761                                      con2fb->framebuffer, 1);
2762                 break;
2763         case FB_EVENT_GET_CONSOLE_MAP:
2764                 con2fb = event->data;
2765                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
2766                 break;
2767         case FB_EVENT_BLANK:
2768                 fbcon_fb_blanked(info, *(int *)event->data);
2769                 break;
2770         case FB_EVENT_NEW_MODELIST:
2771                 fbcon_new_modelist(info);
2772                 break;
2773         }
2774
2775         return ret;
2776 }
2777
2778 /*
2779  *  The console `switch' structure for the frame buffer based console
2780  */
2781
2782 static const struct consw fb_con = {
2783         .owner                  = THIS_MODULE,
2784         .con_startup            = fbcon_startup,
2785         .con_init               = fbcon_init,
2786         .con_deinit             = fbcon_deinit,
2787         .con_clear              = fbcon_clear,
2788         .con_putc               = fbcon_putc,
2789         .con_putcs              = fbcon_putcs,
2790         .con_cursor             = fbcon_cursor,
2791         .con_scroll             = fbcon_scroll,
2792         .con_bmove              = fbcon_bmove,
2793         .con_switch             = fbcon_switch,
2794         .con_blank              = fbcon_blank,
2795         .con_font_set           = fbcon_set_font,
2796         .con_font_get           = fbcon_get_font,
2797         .con_font_default       = fbcon_set_def_font,
2798         .con_font_copy          = fbcon_copy_font,
2799         .con_set_palette        = fbcon_set_palette,
2800         .con_scrolldelta        = fbcon_scrolldelta,
2801         .con_set_origin         = fbcon_set_origin,
2802         .con_invert_region      = fbcon_invert_region,
2803         .con_screen_pos         = fbcon_screen_pos,
2804         .con_getxy              = fbcon_getxy,
2805         .con_resize             = fbcon_resize,
2806 };
2807
2808 static struct notifier_block fbcon_event_notifier = {
2809         .notifier_call  = fbcon_event_notify,
2810 };
2811
2812 static int __init fb_console_init(void)
2813 {
2814         int i;
2815
2816         acquire_console_sem();
2817         fb_register_client(&fbcon_event_notifier);
2818         release_console_sem();
2819
2820         for (i = 0; i < MAX_NR_CONSOLES; i++)
2821                 con2fb_map[i] = -1;
2822
2823         if (num_registered_fb) {
2824                 for (i = 0; i < FB_MAX; i++) {
2825                         if (registered_fb[i] != NULL) {
2826                                 info_idx = i;
2827                                 break;
2828                         }
2829                 }
2830                 fbcon_takeover(0);
2831         }
2832
2833         return 0;
2834 }
2835
2836 module_init(fb_console_init);
2837
2838 #ifdef MODULE
2839
2840 static void __exit fb_console_exit(void)
2841 {
2842         acquire_console_sem();
2843         fb_unregister_client(&fbcon_event_notifier);
2844         release_console_sem();
2845         give_up_console(&fb_con);
2846 }
2847
2848 module_exit(fb_console_exit);
2849
2850 #endif
2851
2852 MODULE_LICENSE("GPL");