drivers/video/console/fbcon.c

   1 /*
   2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1995 Geert Uytterhoeven
   5  *
   6  *
   7  *  This file is based on the original Amiga console driver (amicon.c):
   8  *
   9  *      Copyright (C) 1993 Hamish Macdonald
  10  *                         Greg Harp
  11  *      Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
  12  *
  13  *            with work by William Rucklidge (wjr@cs.cornell.edu)
  14  *                         Geert Uytterhoeven
  15  *                         Jes Sorensen (jds@kom.auc.dk)
  16  *                         Martin Apel
  17  *
  18  *  and on the original Atari console driver (atacon.c):
  19  *
  20  *      Copyright (C) 1993 Bjoern Brauel
  21  *                         Roman Hodek
  22  *
  23  *            with work by Guenther Kelleter
  24  *                         Martin Schaller
  25  *                         Andreas Schwab
  26  *
  27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
  28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
  29  *  and software scrollback added by
  30  *                         Jakub Jelinek (jj@ultra.linux.cz)
  31  *
  32  *  Random hacking by Martin Mares <mj@ucw.cz>
  33  *
  34  *      2001 - Documented with DocBook
  35  *      - Brad Douglas <brad@neruo.com>
  36  *
  37  *  The low level operations for the various display memory organizations are
  38  *  now in separate source files.
  39  *
  40  *  Currently the following organizations are supported:
  41  *
  42  *    o afb                     Amiga bitplanes
  43  *    o cfb{2,4,8,16,24,32}     Packed pixels
  44  *    o ilbm                    Amiga interleaved bitplanes
  45  *    o iplan2p[248]            Atari interleaved bitplanes
  46  *    o mfb                     Monochrome
  47  *    o vga                     VGA characters/attributes
  48  *
  49  *  To do:
  50  *
  51  *    - Implement 16 plane mode (iplan2p16)
  52  *
  53  *
  54  *  This file is subject to the terms and conditions of the GNU General Public
  55  *  License.  See the file COPYING in the main directory of this archive for
  56  *  more details.
  57  */
  58
  59 #undef FBCONDEBUG
  60
  61 #include <linux/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 static struct display fb_display[MAX_NR_CONSOLES];
 110
 111 static signed char con2fb_map[MAX_NR_CONSOLES];
 112 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
 113 static int logo_height;
 114 static int logo_lines;
 115 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 116    enums.  */
 117 static int logo_shown = FBCON_LOGO_CANSHOW;
 118 /* Software scrollback */
 119 static int fbcon_softback_size = 32768;
 120 static unsigned long softback_buf, softback_curr;
 121 static unsigned long softback_in;
 122 static unsigned long softback_top, softback_end;
 123 static int softback_lines;
 124 /* console mappings */
 125 static int first_fb_vc;
 126 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 127 static int fbcon_is_default = 1;
 128 /* font data */
 129 static char fontname[40];
 130
 131 /* current fb_info */
 132 static int info_idx = -1;
 133
 134 /* console rotation */
 135 static int rotate;
 136
 137 static const struct consw fb_con;
 138
 139 #define CM_SOFTBACK     (8)
 140
 141 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 142
 143 static void fbcon_free_font(struct display *);
 144 static int fbcon_set_origin(struct vc_data *);
 145
 146 #define CURSOR_DRAW_DELAY               (1)
 147
 148 /* # VBL ints between cursor state changes */
 149 #define ATARI_CURSOR_BLINK_RATE         (42)
 150 #define MAC_CURSOR_BLINK_RATE           (32)
 151 #define DEFAULT_CURSOR_BLINK_RATE       (20)
 152
 153 static int vbl_cursor_cnt;
 154
 155 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 156
 157 /*
 158  *  Interface used by the world
 159  */
 160
 161 static const char *fbcon_startup(void);
 162 static void fbcon_init(struct vc_data *vc, int init);
 163 static void fbcon_deinit(struct vc_data *vc);
 164 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 165                         int width);
 166 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
 167 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 168                         int count, int ypos, int xpos);
 169 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 170 static void fbcon_cursor(struct vc_data *vc, int mode);
 171 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 172                         int count);
 173 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
 174                         int height, int width);
 175 static int fbcon_switch(struct vc_data *vc);
 176 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
 177 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
 178 static int fbcon_scrolldelta(struct vc_data *vc, int lines);
 179
 180 /*
 181  *  Internal routines
 182  */
 183 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 184 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 185 static __inline__ void ypan_up(struct vc_data *vc, int count);
 186 static __inline__ void ypan_down(struct vc_data *vc, int count);
 187 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
 188                             int dy, int dx, int height, int width, u_int y_break);
 189 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 190                            struct vc_data *vc);
 191 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 192                               int unit);
 193 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 194                               int line, int count, int dy);
 195 static void fbcon_modechanged(struct fb_info *info);
 196 static void fbcon_set_all_vcs(struct fb_info *info);
 197
 198 #ifdef CONFIG_MAC
 199 /*
 200  * On the Macintoy, there may or may not be a working VBL int. We need to probe
 201  */
 202 static int vbl_detected;
 203
 204 static irqreturn_t fb_vbl_detect(int irq, void *dummy, struct pt_regs *fp)
 205 {
 206         vbl_detected++;
 207         return IRQ_HANDLED;
 208 }
 209 #endif
 210
 211 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 212 static inline void fbcon_set_rotation(struct fb_info *info)
 213 {
 214         struct fbcon_ops *ops = info->fbcon_par;
 215
 216         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
 217             ops->p->con_rotate < 4)
 218                 ops->rotate = ops->p->con_rotate;
 219         else
 220                 ops->rotate = 0;
 221 }
 222
 223 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 224 {
 225         struct fbcon_ops *ops= info->fbcon_par;
 226         struct fb_info *fb_info;
 227
 228         if (!ops || ops->currcon == -1)
 229                 return;
 230
 231         fb_info = registered_fb[con2fb_map[ops->currcon]];
 232
 233         if (info == fb_info) {
 234                 struct display *p = &fb_display[ops->currcon];
 235
 236                 if (rotate < 4)
 237                         p->con_rotate = rotate;
 238                 else
 239                         p->con_rotate = 0;
 240
 241                 fbcon_modechanged(info);
 242         }
 243 }
 244
 245 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 246 {
 247         struct fbcon_ops *ops = info->fbcon_par;
 248         struct vc_data *vc;
 249         struct display *p;
 250         int i;
 251
 252         if (!ops || ops->currcon < 0 || rotate > 3)
 253                 return;
 254
 255         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 256                 vc = vc_cons[i].d;
 257                 if (!vc || vc->vc_mode != KD_TEXT ||
 258                     registered_fb[con2fb_map[i]] != info)
 259                         continue;
 260
 261                 p = &fb_display[vc->vc_num];
 262                 p->con_rotate = rotate;
 263         }
 264
 265         fbcon_set_all_vcs(info);
 266 }
 267 #else
 268 static inline void fbcon_set_rotation(struct fb_info *info)
 269 {
 270         struct fbcon_ops *ops = info->fbcon_par;
 271
 272         ops->rotate = FB_ROTATE_UR;
 273 }
 274
 275 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 276 {
 277         return;
 278 }
 279
 280 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 281 {
 282         return;
 283 }
 284 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 285
 286 static int fbcon_get_rotate(struct fb_info *info)
 287 {
 288         struct fbcon_ops *ops = info->fbcon_par;
 289
 290         return (ops) ? ops->rotate : 0;
 291 }
 292
 293 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 294 {
 295         struct fbcon_ops *ops = info->fbcon_par;
 296
 297         return (info->state != FBINFO_STATE_RUNNING ||
 298                 vc->vc_mode != KD_TEXT || ops->graphics);
 299 }
 300
 301 static inline int get_color(struct vc_data *vc, struct fb_info *info,
 302               u16 c, int is_fg)
 303 {
 304         int depth = fb_get_color_depth(&info->var, &info->fix);
 305         int color = 0;
 306
 307         if (console_blanked) {
 308                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 309
 310                 c = vc->vc_video_erase_char & charmask;
 311         }
 312
 313         if (depth != 1)
 314                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 315                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 316
 317         switch (depth) {
 318         case 1:
 319         {
 320                 int col = ~(0xfff << (max(info->var.green.length,
 321                                           max(info->var.red.length,
 322                                               info->var.blue.length)))) & 0xff;
 323
 324                 /* 0 or 1 */
 325                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 326                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 327
 328                 if (console_blanked)
 329                         fg = bg;
 330
 331                 color = (is_fg) ? fg : bg;
 332                 break;
 333         }
 334         case 2:
 335                 /*
 336                  * Scale down 16-colors to 4 colors. Default 4-color palette
 337                  * is grayscale. However, simply dividing the values by 4
 338                  * will not work, as colors 1, 2 and 3 will be scaled-down
 339                  * to zero rendering them invisible.  So empirically convert
 340                  * colors to a sane 4-level grayscale.
 341                  */
 342                 switch (color) {
 343                 case 0:
 344                         color = 0; /* black */
 345                         break;
 346                 case 1 ... 6:
 347                         color = 2; /* white */
 348                         break;
 349                 case 7 ... 8:
 350                         color = 1; /* gray */
 351                         break;
 352                 default:
 353                         color = 3; /* intense white */
 354                         break;
 355                 }
 356                 break;
 357         case 3:
 358                 /*
 359                  * Last 8 entries of default 16-color palette is a more intense
 360                  * version of the first 8 (i.e., same chrominance, different
 361                  * luminance).
 362                  */
 363                 color &= 7;
 364                 break;
 365         }
 366
 367
 368         return color;
 369 }
 370
 371 static void fbcon_update_softback(struct vc_data *vc)
 372 {
 373         int l = fbcon_softback_size / vc->vc_size_row;
 374
 375         if (l > 5)
 376                 softback_end = softback_buf + l * vc->vc_size_row;
 377         else
 378                 /* Smaller scrollback makes no sense, and 0 would screw
 379                    the operation totally */
 380                 softback_top = 0;
 381 }
 382
 383 static void fb_flashcursor(void *private)
 384 {
 385         struct fb_info *info = private;
 386         struct fbcon_ops *ops = info->fbcon_par;
 387         struct display *p;
 388         struct vc_data *vc = NULL;
 389         int c;
 390         int mode;
 391
 392         if (ops->currcon != -1)
 393                 vc = vc_cons[ops->currcon].d;
 394
 395         if (!vc || !CON_IS_VISIBLE(vc) ||
 396             fbcon_is_inactive(vc, info) ||
 397             registered_fb[con2fb_map[vc->vc_num]] != info ||
 398             vc_cons[ops->currcon].d->vc_deccm != 1)
 399                 return;
 400         acquire_console_sem();
 401         p = &fb_display[vc->vc_num];
 402         c = scr_readw((u16 *) vc->vc_pos);
 403         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 404                 CM_ERASE : CM_DRAW;
 405         ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
 406                     get_color(vc, info, c, 0));
 407         release_console_sem();
 408 }
 409
 410 #if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
 411 static int cursor_blink_rate;
 412 static irqreturn_t fb_vbl_handler(int irq, void *dev_id, struct pt_regs *fp)
 413 {
 414         struct fb_info *info = dev_id;
 415
 416         if (vbl_cursor_cnt && --vbl_cursor_cnt == 0) {
 417                 schedule_work(&info->queue);
 418                 vbl_cursor_cnt = cursor_blink_rate;
 419         }
 420         return IRQ_HANDLED;
 421 }
 422 #endif
 423
 424 static void cursor_timer_handler(unsigned long dev_addr)
 425 {
 426         struct fb_info *info = (struct fb_info *) dev_addr;
 427         struct fbcon_ops *ops = info->fbcon_par;
 428
 429         schedule_work(&info->queue);
 430         mod_timer(&ops->cursor_timer, jiffies + HZ/5);
 431 }
 432
 433 static void fbcon_add_cursor_timer(struct fb_info *info)
 434 {
 435         struct fbcon_ops *ops = info->fbcon_par;
 436
 437         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
 438             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER)) {
 439                 if (!info->queue.func)
 440                         INIT_WORK(&info->queue, fb_flashcursor, info);
 441
 442                 init_timer(&ops->cursor_timer);
 443                 ops->cursor_timer.function = cursor_timer_handler;
 444                 ops->cursor_timer.expires = jiffies + HZ / 5;
 445                 ops->cursor_timer.data = (unsigned long ) info;
 446                 add_timer(&ops->cursor_timer);
 447                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
 448         }
 449 }
 450
 451 static void fbcon_del_cursor_timer(struct fb_info *info)
 452 {
 453         struct fbcon_ops *ops = info->fbcon_par;
 454
 455         if (info->queue.func == fb_flashcursor &&
 456             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
 457                 del_timer_sync(&ops->cursor_timer);
 458                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
 459         }
 460 }
 461
 462 #ifndef MODULE
 463 static int __init fb_console_setup(char *this_opt)
 464 {
 465         char *options;
 466         int i, j;
 467
 468         if (!this_opt || !*this_opt)
 469                 return 1;
 470
 471         while ((options = strsep(&this_opt, ",")) != NULL) {
 472                 if (!strncmp(options, "font:", 5))
 473                         strcpy(fontname, options + 5);
 474
 475                 if (!strncmp(options, "scrollback:", 11)) {
 476                         options += 11;
 477                         if (*options) {
 478                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
 479                                 if (*options == 'k' || *options == 'K') {
 480                                         fbcon_softback_size *= 1024;
 481                                         options++;
 482                                 }
 483                                 if (*options != ',')
 484                                         return 1;
 485                                 options++;
 486                         } else
 487                                 return 1;
 488                 }
 489
 490                 if (!strncmp(options, "map:", 4)) {
 491                         options += 4;
 492                         if (*options)
 493                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 494                                         if (!options[j])
 495                                                 j = 0;
 496                                         con2fb_map_boot[i] =
 497                                                 (options[j++]-'0') % FB_MAX;
 498                                 }
 499                         return 1;
 500                 }
 501
 502                 if (!strncmp(options, "vc:", 3)) {
 503                         options += 3;
 504                         if (*options)
 505                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 506                         if (first_fb_vc < 0)
 507                                 first_fb_vc = 0;
 508                         if (*options++ == '-')
 509                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 510                         fbcon_is_default = 0;
 511                 }
 512
 513                 if (!strncmp(options, "rotate:", 7)) {
 514                         options += 7;
 515                         if (*options)
 516                                 rotate = simple_strtoul(options, &options, 0);
 517                         if (rotate > 3)
 518                                 rotate = 0;
 519                 }
 520         }
 521         return 1;
 522 }
 523
 524 __setup("fbcon=", fb_console_setup);
 525 #endif
 526
 527 static int search_fb_in_map(int idx)
 528 {
 529         int i, retval = 0;
 530
 531         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 532                 if (con2fb_map[i] == idx)
 533                         retval = 1;
 534         }
 535         return retval;
 536 }
 537
 538 static int search_for_mapped_con(void)
 539 {
 540         int i, retval = 0;
 541
 542         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 543                 if (con2fb_map[i] != -1)
 544                         retval = 1;
 545         }
 546         return retval;
 547 }
 548
 549 static int fbcon_takeover(int show_logo)
 550 {
 551         int err, i;
 552
 553         if (!num_registered_fb)
 554                 return -ENODEV;
 555
 556         if (!show_logo)
 557                 logo_shown = FBCON_LOGO_DONTSHOW;
 558
 559         for (i = first_fb_vc; i <= last_fb_vc; i++)
 560                 con2fb_map[i] = info_idx;
 561
 562         err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 563                                 fbcon_is_default);
 564         if (err) {
 565                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
 566                         con2fb_map[i] = -1;
 567                 }
 568                 info_idx = -1;
 569         }
 570
 571         return err;
 572 }
 573
 574 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 575                                int cols, int rows, int new_cols, int new_rows)
 576 {
 577         /* Need to make room for the logo */
 578         struct fbcon_ops *ops = info->fbcon_par;
 579         int cnt, erase = vc->vc_video_erase_char, step;
 580         unsigned short *save = NULL, *r, *q;
 581
 582         /*
 583          * remove underline attribute from erase character
 584          * if black and white framebuffer.
 585          */
 586         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 587                 erase &= ~0x400;
 588         logo_height = fb_prepare_logo(info, ops->rotate);
 589         logo_lines = (logo_height + vc->vc_font.height - 1) /
 590                 vc->vc_font.height;
 591         q = (unsigned short *) (vc->vc_origin +
 592                                 vc->vc_size_row * rows);
 593         step = logo_lines * cols;
 594         for (r = q - logo_lines * cols; r < q; r++)
 595                 if (scr_readw(r) != vc->vc_video_erase_char)
 596                         break;
 597         if (r != q && new_rows >= rows + logo_lines) {
 598                 save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
 599                 if (save) {
 600                         int i = cols < new_cols ? cols : new_cols;
 601                         scr_memsetw(save, erase, logo_lines * new_cols * 2);
 602                         r = q - step;
 603                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 604                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 605                         r = q;
 606                 }
 607         }
 608         if (r == q) {
 609                 /* We can scroll screen down */
 610                 r = q - step - cols;
 611                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 612                         scr_memcpyw(r + step, r, vc->vc_size_row);
 613                         r -= cols;
 614                 }
 615                 if (!save) {
 616                         vc->vc_y += logo_lines;
 617                         vc->vc_pos += logo_lines * vc->vc_size_row;
 618                 }
 619         }
 620         scr_memsetw((unsigned short *) vc->vc_origin,
 621                     erase,
 622                     vc->vc_size_row * logo_lines);
 623
 624         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
 625                 fbcon_clear_margins(vc, 0);
 626                 update_screen(vc);
 627         }
 628
 629         if (save) {
 630                 q = (unsigned short *) (vc->vc_origin +
 631                                         vc->vc_size_row *
 632                                         rows);
 633                 scr_memcpyw(q, save, logo_lines * new_cols * 2);
 634                 vc->vc_y += logo_lines;
 635                 vc->vc_pos += logo_lines * vc->vc_size_row;
 636                 kfree(save);
 637         }
 638
 639         if (logo_lines > vc->vc_bottom) {
 640                 logo_shown = FBCON_LOGO_CANSHOW;
 641                 printk(KERN_INFO
 642                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
 643         } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
 644                 logo_shown = FBCON_LOGO_DRAW;
 645                 vc->vc_top = logo_lines;
 646         }
 647 }
 648
 649 #ifdef CONFIG_FB_TILEBLITTING
 650 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 651 {
 652         struct fbcon_ops *ops = info->fbcon_par;
 653
 654         ops->p = &fb_display[vc->vc_num];
 655
 656         if ((info->flags & FBINFO_MISC_TILEBLITTING))
 657                 fbcon_set_tileops(vc, info);
 658         else {
 659                 fbcon_set_rotation(info);
 660                 fbcon_set_bitops(ops);
 661         }
 662 }
 663 #else
 664 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 665 {
 666         struct fbcon_ops *ops = info->fbcon_par;
 667
 668         info->flags &= ~FBINFO_MISC_TILEBLITTING;
 669         ops->p = &fb_display[vc->vc_num];
 670         fbcon_set_rotation(info);
 671         fbcon_set_bitops(ops);
 672 }
 673 #endif /* CONFIG_MISC_TILEBLITTING */
 674
 675
 676 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
 677                                   int unit, int oldidx)
 678 {
 679         struct fbcon_ops *ops = NULL;
 680         int err = 0;
 681
 682         if (!try_module_get(info->fbops->owner))
 683                 err = -ENODEV;
 684
 685         if (!err && info->fbops->fb_open &&
 686             info->fbops->fb_open(info, 0))
 687                 err = -ENODEV;
 688
 689         if (!err) {
 690                 ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 691                 if (!ops)
 692                         err = -ENOMEM;
 693         }
 694
 695         if (!err) {
 696                 info->fbcon_par = ops;
 697                 set_blitting_type(vc, info);
 698         }
 699
 700         if (err) {
 701                 con2fb_map[unit] = oldidx;
 702                 module_put(info->fbops->owner);
 703         }
 704
 705         return err;
 706 }
 707
 708 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 709                                   struct fb_info *newinfo, int unit,
 710                                   int oldidx, int found)
 711 {
 712         struct fbcon_ops *ops = oldinfo->fbcon_par;
 713         int err = 0;
 714
 715         if (oldinfo->fbops->fb_release &&
 716             oldinfo->fbops->fb_release(oldinfo, 0)) {
 717                 con2fb_map[unit] = oldidx;
 718                 if (!found && newinfo->fbops->fb_release)
 719                         newinfo->fbops->fb_release(newinfo, 0);
 720                 if (!found)
 721                         module_put(newinfo->fbops->owner);
 722                 err = -ENODEV;
 723         }
 724
 725         if (!err) {
 726                 fbcon_del_cursor_timer(oldinfo);
 727                 kfree(ops->cursor_state.mask);
 728                 kfree(ops->cursor_data);
 729                 kfree(ops->fontbuffer);
 730                 kfree(oldinfo->fbcon_par);
 731                 oldinfo->fbcon_par = NULL;
 732                 module_put(oldinfo->fbops->owner);
 733                 /*
 734                   If oldinfo and newinfo are driving the same hardware,
 735                   the fb_release() method of oldinfo may attempt to
 736                   restore the hardware state.  This will leave the
 737                   newinfo in an undefined state. Thus, a call to
 738                   fb_set_par() may be needed for the newinfo.
 739                 */
 740                 if (newinfo->fbops->fb_set_par)
 741                         newinfo->fbops->fb_set_par(newinfo);
 742         }
 743
 744         return err;
 745 }
 746
 747 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 748                                 int unit, int show_logo)
 749 {
 750         struct fbcon_ops *ops = info->fbcon_par;
 751
 752         ops->currcon = fg_console;
 753
 754         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT))
 755                 info->fbops->fb_set_par(info);
 756
 757         ops->flags |= FBCON_FLAGS_INIT;
 758         ops->graphics = 0;
 759
 760         if (vc)
 761                 fbcon_set_disp(info, &info->var, vc);
 762         else
 763                 fbcon_preset_disp(info, &info->var, unit);
 764
 765         if (show_logo) {
 766                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 767                 struct fb_info *fg_info =
 768                         registered_fb[con2fb_map[fg_console]];
 769
 770                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 771                                    fg_vc->vc_rows, fg_vc->vc_cols,
 772                                    fg_vc->vc_rows);
 773         }
 774
 775         update_screen(vc_cons[fg_console].d);
 776 }
 777
 778 /**
 779  *      set_con2fb_map - map console to frame buffer device
 780  *      @unit: virtual console number to map
 781  *      @newidx: frame buffer index to map virtual console to
 782  *      @user: user request
 783  *
 784  *      Maps a virtual console @unit to a frame buffer device
 785  *      @newidx.
 786  */
 787 static int set_con2fb_map(int unit, int newidx, int user)
 788 {
 789         struct vc_data *vc = vc_cons[unit].d;
 790         int oldidx = con2fb_map[unit];
 791         struct fb_info *info = registered_fb[newidx];
 792         struct fb_info *oldinfo = NULL;
 793         int found, err = 0;
 794
 795         if (oldidx == newidx)
 796                 return 0;
 797
 798         if (!info)
 799                 err =  -EINVAL;
 800
 801         if (!err && !search_for_mapped_con()) {
 802                 info_idx = newidx;
 803                 return fbcon_takeover(0);
 804         }
 805
 806         if (oldidx != -1)
 807                 oldinfo = registered_fb[oldidx];
 808
 809         found = search_fb_in_map(newidx);
 810
 811         acquire_console_sem();
 812         con2fb_map[unit] = newidx;
 813         if (!err && !found)
 814                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 815
 816
 817         /*
 818          * If old fb is not mapped to any of the consoles,
 819          * fbcon should release it.
 820          */
 821         if (!err && oldinfo && !search_fb_in_map(oldidx))
 822                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 823                                              found);
 824
 825         if (!err) {
 826                 int show_logo = (fg_console == 0 && !user &&
 827                                  logo_shown != FBCON_LOGO_DONTSHOW);
 828
 829                 if (!found)
 830                         fbcon_add_cursor_timer(info);
 831                 con2fb_map_boot[unit] = newidx;
 832                 con2fb_init_display(vc, info, unit, show_logo);
 833         }
 834
 835         release_console_sem();
 836         return err;
 837 }
 838
 839 /*
 840  *  Low Level Operations
 841  */
 842 /* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
 843 static int var_to_display(struct display *disp,
 844                           struct fb_var_screeninfo *var,
 845                           struct fb_info *info)
 846 {
 847         disp->xres_virtual = var->xres_virtual;
 848         disp->yres_virtual = var->yres_virtual;
 849         disp->bits_per_pixel = var->bits_per_pixel;
 850         disp->grayscale = var->grayscale;
 851         disp->nonstd = var->nonstd;
 852         disp->accel_flags = var->accel_flags;
 853         disp->height = var->height;
 854         disp->width = var->width;
 855         disp->red = var->red;
 856         disp->green = var->green;
 857         disp->blue = var->blue;
 858         disp->transp = var->transp;
 859         disp->rotate = var->rotate;
 860         disp->mode = fb_match_mode(var, &info->modelist);
 861         if (disp->mode == NULL)
 862                 /* This should not happen */
 863                 return -EINVAL;
 864         return 0;
 865 }
 866
 867 static void display_to_var(struct fb_var_screeninfo *var,
 868                            struct display *disp)
 869 {
 870         fb_videomode_to_var(var, disp->mode);
 871         var->xres_virtual = disp->xres_virtual;
 872         var->yres_virtual = disp->yres_virtual;
 873         var->bits_per_pixel = disp->bits_per_pixel;
 874         var->grayscale = disp->grayscale;
 875         var->nonstd = disp->nonstd;
 876         var->accel_flags = disp->accel_flags;
 877         var->height = disp->height;
 878         var->width = disp->width;
 879         var->red = disp->red;
 880         var->green = disp->green;
 881         var->blue = disp->blue;
 882         var->transp = disp->transp;
 883         var->rotate = disp->rotate;
 884 }
 885
 886 static const char *fbcon_startup(void)
 887 {
 888         const char *display_desc = "frame buffer device";
 889         struct display *p = &fb_display[fg_console];
 890         struct vc_data *vc = vc_cons[fg_console].d;
 891         const struct font_desc *font = NULL;
 892         struct module *owner;
 893         struct fb_info *info = NULL;
 894         struct fbcon_ops *ops;
 895         int rows, cols;
 896         int irqres;
 897
 898         irqres = 1;
 899         /*
 900          *  If num_registered_fb is zero, this is a call for the dummy part.
 901          *  The frame buffer devices weren't initialized yet.
 902          */
 903         if (!num_registered_fb || info_idx == -1)
 904                 return display_desc;
 905         /*
 906          * Instead of blindly using registered_fb[0], we use info_idx, set by
 907          * fb_console_init();
 908          */
 909         info = registered_fb[info_idx];
 910         if (!info)
 911                 return NULL;
 912
 913         owner = info->fbops->owner;
 914         if (!try_module_get(owner))
 915                 return NULL;
 916         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 917                 module_put(owner);
 918                 return NULL;
 919         }
 920
 921         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 922         if (!ops) {
 923                 module_put(owner);
 924                 return NULL;
 925         }
 926
 927         ops->currcon = -1;
 928         ops->graphics = 1;
 929         ops->cur_rotate = -1;
 930         info->fbcon_par = ops;
 931         p->con_rotate = rotate;
 932         set_blitting_type(vc, info);
 933
 934         if (info->fix.type != FB_TYPE_TEXT) {
 935                 if (fbcon_softback_size) {
 936                         if (!softback_buf) {
 937                                 softback_buf =
 938                                     (unsigned long)
 939                                     kmalloc(fbcon_softback_size,
 940                                             GFP_KERNEL);
 941                                 if (!softback_buf) {
 942                                         fbcon_softback_size = 0;
 943                                         softback_top = 0;
 944                                 }
 945                         }
 946                 } else {
 947                         if (softback_buf) {
 948                                 kfree((void *) softback_buf);
 949                                 softback_buf = 0;
 950                                 softback_top = 0;
 951                         }
 952                 }
 953                 if (softback_buf)
 954                         softback_in = softback_top = softback_curr =
 955                             softback_buf;
 956                 softback_lines = 0;
 957         }
 958
 959         /* Setup default font */
 960         if (!p->fontdata) {
 961                 if (!fontname[0] || !(font = find_font(fontname)))
 962                         font = get_default_font(info->var.xres,
 963                                                 info->var.yres);
 964                 vc->vc_font.width = font->width;
 965                 vc->vc_font.height = font->height;
 966                 vc->vc_font.data = (void *)(p->fontdata = font->data);
 967                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
 968         }
 969
 970         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
 971         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
 972         cols /= vc->vc_font.width;
 973         rows /= vc->vc_font.height;
 974         vc_resize(vc, cols, rows);
 975
 976         DPRINTK("mode:   %s\n", info->fix.id);
 977         DPRINTK("visual: %d\n", info->fix.visual);
 978         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
 979                 info->var.yres,
 980                 info->var.bits_per_pixel);
 981
 982 #ifdef CONFIG_ATARI
 983         if (MACH_IS_ATARI) {
 984                 cursor_blink_rate = ATARI_CURSOR_BLINK_RATE;
 985                 irqres =
 986                     request_irq(IRQ_AUTO_4, fb_vbl_handler,
 987                                 IRQ_TYPE_PRIO, "framebuffer vbl",
 988                                 info);
 989         }
 990 #endif                          /* CONFIG_ATARI */
 991
 992 #ifdef CONFIG_MAC
 993         /*
 994          * On a Macintoy, the VBL interrupt may or may not be active.
 995          * As interrupt based cursor is more reliable and race free, we
 996          * probe for VBL interrupts.
 997          */
 998         if (MACH_IS_MAC) {
 999                 int ct = 0;
1000                 /*
1001                  * Probe for VBL: set temp. handler ...
1002                  */
1003                 irqres = request_irq(IRQ_MAC_VBL, fb_vbl_detect, 0,
1004                                      "framebuffer vbl", info);
1005                 vbl_detected = 0;
1006
1007                 /*
1008                  * ... and spin for 20 ms ...
1009                  */
1010                 while (!vbl_detected && ++ct < 1000)
1011                         udelay(20);
1012
1013                 if (ct == 1000)
1014                         printk
1015                             ("fbcon_startup: No VBL detected, using timer based cursor.\n");
1016
1017                 free_irq(IRQ_MAC_VBL, fb_vbl_detect);
1018
1019                 if (vbl_detected) {
1020                         /*
1021                          * interrupt based cursor ok
1022                          */
1023                         cursor_blink_rate = MAC_CURSOR_BLINK_RATE;
1024                         irqres =
1025                             request_irq(IRQ_MAC_VBL, fb_vbl_handler, 0,
1026                                         "framebuffer vbl", info);
1027                 } else {
1028                         /*
1029                          * VBL not detected: fall through, use timer based cursor
1030                          */
1031                         irqres = 1;
1032                 }
1033         }
1034 #endif                          /* CONFIG_MAC */
1035
1036         fbcon_add_cursor_timer(info);
1037         return display_desc;
1038 }
1039
1040 static void fbcon_init(struct vc_data *vc, int init)
1041 {
1042         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1043         struct fbcon_ops *ops;
1044         struct vc_data **default_mode = vc->vc_display_fg;
1045         struct vc_data *svc = *default_mode;
1046         struct display *t, *p = &fb_display[vc->vc_num];
1047         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1048         int cap;
1049
1050         if (info_idx == -1 || info == NULL)
1051             return;
1052
1053         cap = info->flags;
1054
1055         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1056             (info->fix.type == FB_TYPE_TEXT))
1057                 logo = 0;
1058
1059         if (var_to_display(p, &info->var, info))
1060                 return;
1061
1062         /* If we are not the first console on this
1063            fb, copy the font from that console */
1064         t = &fb_display[svc->vc_num];
1065         if (!vc->vc_font.data) {
1066                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1067                 vc->vc_font.width = (*default_mode)->vc_font.width;
1068                 vc->vc_font.height = (*default_mode)->vc_font.height;
1069                 p->userfont = t->userfont;
1070                 if (p->userfont)
1071                         REFCOUNT(p->fontdata)++;
1072         }
1073         if (p->userfont)
1074                 charcnt = FNTCHARCNT(p->fontdata);
1075         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1076         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1077         if (charcnt == 256) {
1078                 vc->vc_hi_font_mask = 0;
1079         } else {
1080                 vc->vc_hi_font_mask = 0x100;
1081                 if (vc->vc_can_do_color)
1082                         vc->vc_complement_mask <<= 1;
1083         }
1084
1085         if (!*svc->vc_uni_pagedir_loc)
1086                 con_set_default_unimap(svc);
1087         if (!*vc->vc_uni_pagedir_loc)
1088                 con_copy_unimap(vc, svc);
1089
1090         ops = info->fbcon_par;
1091         p->con_rotate = rotate;
1092         set_blitting_type(vc, info);
1093
1094         cols = vc->vc_cols;
1095         rows = vc->vc_rows;
1096         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1097         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1098         new_cols /= vc->vc_font.width;
1099         new_rows /= vc->vc_font.height;
1100         vc_resize(vc, new_cols, new_rows);
1101
1102         /*
1103          * We must always set the mode. The mode of the previous console
1104          * driver could be in the same resolution but we are using different
1105          * hardware so we have to initialize the hardware.
1106          *
1107          * We need to do it in fbcon_init() to prevent screen corruption.
1108          */
1109         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
1110                 if (info->fbops->fb_set_par &&
1111                     !(ops->flags & FBCON_FLAGS_INIT))
1112                         info->fbops->fb_set_par(info);
1113                 ops->flags |= FBCON_FLAGS_INIT;
1114         }
1115
1116         ops->graphics = 0;
1117
1118         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1119             !(cap & FBINFO_HWACCEL_DISABLED))
1120                 p->scrollmode = SCROLL_MOVE;
1121         else /* default to something safe */
1122                 p->scrollmode = SCROLL_REDRAW;
1123
1124         /*
1125          *  ++guenther: console.c:vc_allocate() relies on initializing
1126          *  vc_{cols,rows}, but we must not set those if we are only
1127          *  resizing the console.
1128          */
1129         if (!init) {
1130                 vc->vc_cols = new_cols;
1131                 vc->vc_rows = new_rows;
1132         }
1133
1134         if (logo)
1135                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1136
1137         if (vc == svc && softback_buf)
1138                 fbcon_update_softback(vc);
1139
1140         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1141                 ops->rotate = FB_ROTATE_UR;
1142                 set_blitting_type(vc, info);
1143         }
1144
1145         ops->p = &fb_display[fg_console];
1146 }
1147
1148 static void fbcon_deinit(struct vc_data *vc)
1149 {
1150         struct display *p = &fb_display[vc->vc_num];
1151
1152         if (info_idx != -1)
1153             return;
1154         fbcon_free_font(p);
1155 }
1156
1157 /* ====================================================================== */
1158
1159 /*  fbcon_XXX routines - interface used by the world
1160  *
1161  *  This system is now divided into two levels because of complications
1162  *  caused by hardware scrolling. Top level functions:
1163  *
1164  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1165  *
1166  *  handles y values in range [0, scr_height-1] that correspond to real
1167  *  screen positions. y_wrap shift means that first line of bitmap may be
1168  *  anywhere on this display. These functions convert lineoffsets to
1169  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1170  *
1171  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1172  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1173  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1174  *
1175  *  WARNING:
1176  *
1177  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1178  *  Implies should only really hardware scroll in rows. Only reason for
1179  *  restriction is simplicity & efficiency at the moment.
1180  */
1181
1182 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1183                         int width)
1184 {
1185         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1186         struct fbcon_ops *ops = info->fbcon_par;
1187
1188         struct display *p = &fb_display[vc->vc_num];
1189         u_int y_break;
1190
1191         if (fbcon_is_inactive(vc, info))
1192                 return;
1193
1194         if (!height || !width)
1195                 return;
1196
1197         /* Split blits that cross physical y_wrap boundary */
1198
1199         y_break = p->vrows - p->yscroll;
1200         if (sy < y_break && sy + height - 1 >= y_break) {
1201                 u_int b = y_break - sy;
1202                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1203                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1204                                  width);
1205         } else
1206                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1207 }
1208
1209 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1210                         int count, int ypos, int xpos)
1211 {
1212         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1213         struct display *p = &fb_display[vc->vc_num];
1214         struct fbcon_ops *ops = info->fbcon_par;
1215
1216         if (!fbcon_is_inactive(vc, info))
1217                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1218                            get_color(vc, info, scr_readw(s), 1),
1219                            get_color(vc, info, scr_readw(s), 0));
1220 }
1221
1222 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1223 {
1224         unsigned short chr;
1225
1226         scr_writew(c, &chr);
1227         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1228 }
1229
1230 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1231 {
1232         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1233         struct fbcon_ops *ops = info->fbcon_par;
1234
1235         if (!fbcon_is_inactive(vc, info))
1236                 ops->clear_margins(vc, info, bottom_only);
1237 }
1238
1239 static void fbcon_cursor(struct vc_data *vc, int mode)
1240 {
1241         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1242         struct fbcon_ops *ops = info->fbcon_par;
1243         int y;
1244         int c = scr_readw((u16 *) vc->vc_pos);
1245
1246         if (fbcon_is_inactive(vc, info))
1247                 return;
1248
1249         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1250         if (mode & CM_SOFTBACK) {
1251                 mode &= ~CM_SOFTBACK;
1252                 y = softback_lines;
1253         } else {
1254                 if (softback_lines)
1255                         fbcon_set_origin(vc);
1256                 y = 0;
1257         }
1258
1259         ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
1260                     get_color(vc, info, c, 0));
1261         vbl_cursor_cnt = CURSOR_DRAW_DELAY;
1262 }
1263
1264 static int scrollback_phys_max = 0;
1265 static int scrollback_max = 0;
1266 static int scrollback_current = 0;
1267
1268 /*
1269  * If no vc is existent yet, just set struct display
1270  */
1271 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1272                               int unit)
1273 {
1274         struct display *p = &fb_display[unit];
1275         struct display *t = &fb_display[fg_console];
1276
1277         if (var_to_display(p, var, info))
1278                 return;
1279
1280         p->fontdata = t->fontdata;
1281         p->userfont = t->userfont;
1282         if (p->userfont)
1283                 REFCOUNT(p->fontdata)++;
1284 }
1285
1286 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1287                            struct vc_data *vc)
1288 {
1289         struct display *p = &fb_display[vc->vc_num], *t;
1290         struct vc_data **default_mode = vc->vc_display_fg;
1291         struct vc_data *svc = *default_mode;
1292         struct fbcon_ops *ops = info->fbcon_par;
1293         int rows, cols, charcnt = 256;
1294
1295         if (var_to_display(p, var, info))
1296                 return;
1297         t = &fb_display[svc->vc_num];
1298         if (!vc->vc_font.data) {
1299                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1300                 vc->vc_font.width = (*default_mode)->vc_font.width;
1301                 vc->vc_font.height = (*default_mode)->vc_font.height;
1302                 p->userfont = t->userfont;
1303                 if (p->userfont)
1304                         REFCOUNT(p->fontdata)++;
1305         }
1306         if (p->userfont)
1307                 charcnt = FNTCHARCNT(p->fontdata);
1308
1309         var->activate = FB_ACTIVATE_NOW;
1310         info->var.activate = var->activate;
1311         var->yoffset = info->var.yoffset;
1312         var->xoffset = info->var.xoffset;
1313         fb_set_var(info, var);
1314         ops->var = info->var;
1315         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1316         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1317         if (charcnt == 256) {
1318                 vc->vc_hi_font_mask = 0;
1319         } else {
1320                 vc->vc_hi_font_mask = 0x100;
1321                 if (vc->vc_can_do_color)
1322                         vc->vc_complement_mask <<= 1;
1323         }
1324
1325         if (!*svc->vc_uni_pagedir_loc)
1326                 con_set_default_unimap(svc);
1327         if (!*vc->vc_uni_pagedir_loc)
1328                 con_copy_unimap(vc, svc);
1329
1330         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1331         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1332         cols /= vc->vc_font.width;
1333         rows /= vc->vc_font.height;
1334         vc_resize(vc, cols, rows);
1335
1336         if (CON_IS_VISIBLE(vc)) {
1337                 update_screen(vc);
1338                 if (softback_buf)
1339                         fbcon_update_softback(vc);
1340         }
1341 }
1342
1343 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1344 {
1345         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1346         struct fbcon_ops *ops = info->fbcon_par;
1347         struct display *p = &fb_display[vc->vc_num];
1348
1349         p->yscroll += count;
1350         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1351                 p->yscroll -= p->vrows;
1352         ops->var.xoffset = 0;
1353         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1354         ops->var.vmode |= FB_VMODE_YWRAP;
1355         ops->update_start(info);
1356         scrollback_max += count;
1357         if (scrollback_max > scrollback_phys_max)
1358                 scrollback_max = scrollback_phys_max;
1359         scrollback_current = 0;
1360 }
1361
1362 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1363 {
1364         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1365         struct fbcon_ops *ops = info->fbcon_par;
1366         struct display *p = &fb_display[vc->vc_num];
1367
1368         p->yscroll -= count;
1369         if (p->yscroll < 0)     /* Deal with wrap */
1370                 p->yscroll += p->vrows;
1371         ops->var.xoffset = 0;
1372         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1373         ops->var.vmode |= FB_VMODE_YWRAP;
1374         ops->update_start(info);
1375         scrollback_max -= count;
1376         if (scrollback_max < 0)
1377                 scrollback_max = 0;
1378         scrollback_current = 0;
1379 }
1380
1381 static __inline__ void ypan_up(struct vc_data *vc, int count)
1382 {
1383         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1384         struct display *p = &fb_display[vc->vc_num];
1385         struct fbcon_ops *ops = info->fbcon_par;
1386
1387         p->yscroll += count;
1388         if (p->yscroll > p->vrows - vc->vc_rows) {
1389                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1390                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1391                 p->yscroll -= p->vrows - vc->vc_rows;
1392         }
1393
1394         ops->var.xoffset = 0;
1395         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1396         ops->var.vmode &= ~FB_VMODE_YWRAP;
1397         ops->update_start(info);
1398         fbcon_clear_margins(vc, 1);
1399         scrollback_max += count;
1400         if (scrollback_max > scrollback_phys_max)
1401                 scrollback_max = scrollback_phys_max;
1402         scrollback_current = 0;
1403 }
1404
1405 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1406 {
1407         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1408         struct fbcon_ops *ops = info->fbcon_par;
1409         struct display *p = &fb_display[vc->vc_num];
1410
1411         p->yscroll += count;
1412
1413         if (p->yscroll > p->vrows - vc->vc_rows) {
1414                 p->yscroll -= p->vrows - vc->vc_rows;
1415                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1416         }
1417
1418         ops->var.xoffset = 0;
1419         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1420         ops->var.vmode &= ~FB_VMODE_YWRAP;
1421         ops->update_start(info);
1422         fbcon_clear_margins(vc, 1);
1423         scrollback_max += count;
1424         if (scrollback_max > scrollback_phys_max)
1425                 scrollback_max = scrollback_phys_max;
1426         scrollback_current = 0;
1427 }
1428
1429 static __inline__ void ypan_down(struct vc_data *vc, int count)
1430 {
1431         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1432         struct display *p = &fb_display[vc->vc_num];
1433         struct fbcon_ops *ops = info->fbcon_par;
1434
1435         p->yscroll -= count;
1436         if (p->yscroll < 0) {
1437                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1438                             0, vc->vc_rows, vc->vc_cols);
1439                 p->yscroll += p->vrows - vc->vc_rows;
1440         }
1441
1442         ops->var.xoffset = 0;
1443         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1444         ops->var.vmode &= ~FB_VMODE_YWRAP;
1445         ops->update_start(info);
1446         fbcon_clear_margins(vc, 1);
1447         scrollback_max -= count;
1448         if (scrollback_max < 0)
1449                 scrollback_max = 0;
1450         scrollback_current = 0;
1451 }
1452
1453 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1454 {
1455         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1456         struct fbcon_ops *ops = info->fbcon_par;
1457         struct display *p = &fb_display[vc->vc_num];
1458
1459         p->yscroll -= count;
1460
1461         if (p->yscroll < 0) {
1462                 p->yscroll += p->vrows - vc->vc_rows;
1463                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1464         }
1465
1466         ops->var.xoffset = 0;
1467         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1468         ops->var.vmode &= ~FB_VMODE_YWRAP;
1469         ops->update_start(info);
1470         fbcon_clear_margins(vc, 1);
1471         scrollback_max -= count;
1472         if (scrollback_max < 0)
1473                 scrollback_max = 0;
1474         scrollback_current = 0;
1475 }
1476
1477 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1478                                   long delta)
1479 {
1480         int count = vc->vc_rows;
1481         unsigned short *d, *s;
1482         unsigned long n;
1483         int line = 0;
1484
1485         d = (u16 *) softback_curr;
1486         if (d == (u16 *) softback_in)
1487                 d = (u16 *) vc->vc_origin;
1488         n = softback_curr + delta * vc->vc_size_row;
1489         softback_lines -= delta;
1490         if (delta < 0) {
1491                 if (softback_curr < softback_top && n < softback_buf) {
1492                         n += softback_end - softback_buf;
1493                         if (n < softback_top) {
1494                                 softback_lines -=
1495                                     (softback_top - n) / vc->vc_size_row;
1496                                 n = softback_top;
1497                         }
1498                 } else if (softback_curr >= softback_top
1499                            && n < softback_top) {
1500                         softback_lines -=
1501                             (softback_top - n) / vc->vc_size_row;
1502                         n = softback_top;
1503                 }
1504         } else {
1505                 if (softback_curr > softback_in && n >= softback_end) {
1506                         n += softback_buf - softback_end;
1507                         if (n > softback_in) {
1508                                 n = softback_in;
1509                                 softback_lines = 0;
1510                         }
1511                 } else if (softback_curr <= softback_in && n > softback_in) {
1512                         n = softback_in;
1513                         softback_lines = 0;
1514                 }
1515         }
1516         if (n == softback_curr)
1517                 return;
1518         softback_curr = n;
1519         s = (u16 *) softback_curr;
1520         if (s == (u16 *) softback_in)
1521                 s = (u16 *) vc->vc_origin;
1522         while (count--) {
1523                 unsigned short *start;
1524                 unsigned short *le;
1525                 unsigned short c;
1526                 int x = 0;
1527                 unsigned short attr = 1;
1528
1529                 start = s;
1530                 le = advance_row(s, 1);
1531                 do {
1532                         c = scr_readw(s);
1533                         if (attr != (c & 0xff00)) {
1534                                 attr = c & 0xff00;
1535                                 if (s > start) {
1536                                         fbcon_putcs(vc, start, s - start,
1537                                                     line, x);
1538                                         x += s - start;
1539                                         start = s;
1540                                 }
1541                         }
1542                         if (c == scr_readw(d)) {
1543                                 if (s > start) {
1544                                         fbcon_putcs(vc, start, s - start,
1545                                                     line, x);
1546                                         x += s - start + 1;
1547                                         start = s + 1;
1548                                 } else {
1549                                         x++;
1550                                         start++;
1551                                 }
1552                         }
1553                         s++;
1554                         d++;
1555                 } while (s < le);
1556                 if (s > start)
1557                         fbcon_putcs(vc, start, s - start, line, x);
1558                 line++;
1559                 if (d == (u16 *) softback_end)
1560                         d = (u16 *) softback_buf;
1561                 if (d == (u16 *) softback_in)
1562                         d = (u16 *) vc->vc_origin;
1563                 if (s == (u16 *) softback_end)
1564                         s = (u16 *) softback_buf;
1565                 if (s == (u16 *) softback_in)
1566                         s = (u16 *) vc->vc_origin;
1567         }
1568 }
1569
1570 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1571                               int line, int count, int dy)
1572 {
1573         unsigned short *s = (unsigned short *)
1574                 (vc->vc_origin + vc->vc_size_row * line);
1575
1576         while (count--) {
1577                 unsigned short *start = s;
1578                 unsigned short *le = advance_row(s, 1);
1579                 unsigned short c;
1580                 int x = 0;
1581                 unsigned short attr = 1;
1582
1583                 do {
1584                         c = scr_readw(s);
1585                         if (attr != (c & 0xff00)) {
1586                                 attr = c & 0xff00;
1587                                 if (s > start) {
1588                                         fbcon_putcs(vc, start, s - start,
1589                                                     dy, x);
1590                                         x += s - start;
1591                                         start = s;
1592                                 }
1593                         }
1594                         console_conditional_schedule();
1595                         s++;
1596                 } while (s < le);
1597                 if (s > start)
1598                         fbcon_putcs(vc, start, s - start, dy, x);
1599                 console_conditional_schedule();
1600                 dy++;
1601         }
1602 }
1603
1604 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1605                          int line, int count, int offset)
1606 {
1607         unsigned short *d = (unsigned short *)
1608             (vc->vc_origin + vc->vc_size_row * line);
1609         unsigned short *s = d + offset;
1610
1611         while (count--) {
1612                 unsigned short *start = s;
1613                 unsigned short *le = advance_row(s, 1);
1614                 unsigned short c;
1615                 int x = 0;
1616                 unsigned short attr = 1;
1617
1618                 do {
1619                         c = scr_readw(s);
1620                         if (attr != (c & 0xff00)) {
1621                                 attr = c & 0xff00;
1622                                 if (s > start) {
1623                                         fbcon_putcs(vc, start, s - start,
1624                                                     line, x);
1625                                         x += s - start;
1626                                         start = s;
1627                                 }
1628                         }
1629                         if (c == scr_readw(d)) {
1630                                 if (s > start) {
1631                                         fbcon_putcs(vc, start, s - start,
1632                                                      line, x);
1633                                         x += s - start + 1;
1634                                         start = s + 1;
1635                                 } else {
1636                                         x++;
1637                                         start++;
1638                                 }
1639                         }
1640                         scr_writew(c, d);
1641                         console_conditional_schedule();
1642                         s++;
1643                         d++;
1644                 } while (s < le);
1645                 if (s > start)
1646                         fbcon_putcs(vc, start, s - start, line, x);
1647                 console_conditional_schedule();
1648                 if (offset > 0)
1649                         line++;
1650                 else {
1651                         line--;
1652                         /* NOTE: We subtract two lines from these pointers */
1653                         s -= vc->vc_size_row;
1654                         d -= vc->vc_size_row;
1655                 }
1656         }
1657 }
1658
1659 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1660                                        int count)
1661 {
1662         unsigned short *p;
1663
1664         if (vc->vc_num != fg_console)
1665                 return;
1666         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1667
1668         while (count) {
1669                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1670                 count--;
1671                 p = advance_row(p, 1);
1672                 softback_in += vc->vc_size_row;
1673                 if (softback_in == softback_end)
1674                         softback_in = softback_buf;
1675                 if (softback_in == softback_top) {
1676                         softback_top += vc->vc_size_row;
1677                         if (softback_top == softback_end)
1678                                 softback_top = softback_buf;
1679                 }
1680         }
1681         softback_curr = softback_in;
1682 }
1683
1684 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1685                         int count)
1686 {
1687         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1688         struct display *p = &fb_display[vc->vc_num];
1689         struct fbcon_ops *ops = info->fbcon_par;
1690         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1691
1692         if (fbcon_is_inactive(vc, info))
1693                 return -EINVAL;
1694
1695         fbcon_cursor(vc, CM_ERASE);
1696
1697         /*
1698          * ++Geert: Only use ywrap/ypan if the console is in text mode
1699          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1700          *           whole screen (prevents flicker).
1701          */
1702
1703         switch (dir) {
1704         case SM_UP:
1705                 if (count > vc->vc_rows)        /* Maximum realistic size */
1706                         count = vc->vc_rows;
1707                 if (softback_top)
1708                         fbcon_softback_note(vc, t, count);
1709                 if (logo_shown >= 0)
1710                         goto redraw_up;
1711                 switch (p->scrollmode) {
1712                 case SCROLL_MOVE:
1713                         ops->bmove(vc, info, t + count, 0, t, 0,
1714                                     b - t - count, vc->vc_cols);
1715                         ops->clear(vc, info, b - count, 0, count,
1716                                   vc->vc_cols);
1717                         break;
1718
1719                 case SCROLL_WRAP_MOVE:
1720                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1721                                 if (t > 0)
1722                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1723                                                     vc->vc_cols);
1724                                 ywrap_up(vc, count);
1725                                 if (vc->vc_rows - b > 0)
1726                                         fbcon_bmove(vc, b - count, 0, b, 0,
1727                                                     vc->vc_rows - b,
1728                                                     vc->vc_cols);
1729                         } else if (info->flags & FBINFO_READS_FAST)
1730                                 fbcon_bmove(vc, t + count, 0, t, 0,
1731                                             b - t - count, vc->vc_cols);
1732                         else
1733                                 goto redraw_up;
1734                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1735                         break;
1736
1737                 case SCROLL_PAN_REDRAW:
1738                         if ((p->yscroll + count <=
1739                              2 * (p->vrows - vc->vc_rows))
1740                             && ((!scroll_partial && (b - t == vc->vc_rows))
1741                                 || (scroll_partial
1742                                     && (b - t - count >
1743                                         3 * vc->vc_rows >> 2)))) {
1744                                 if (t > 0)
1745                                         fbcon_redraw_move(vc, p, 0, t, count);
1746                                 ypan_up_redraw(vc, t, count);
1747                                 if (vc->vc_rows - b > 0)
1748                                         fbcon_redraw_move(vc, p, b,
1749                                                           vc->vc_rows - b, b);
1750                         } else
1751                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1752                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1753                         break;
1754
1755                 case SCROLL_PAN_MOVE:
1756                         if ((p->yscroll + count <=
1757                              2 * (p->vrows - vc->vc_rows))
1758                             && ((!scroll_partial && (b - t == vc->vc_rows))
1759                                 || (scroll_partial
1760                                     && (b - t - count >
1761                                         3 * vc->vc_rows >> 2)))) {
1762                                 if (t > 0)
1763                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1764                                                     vc->vc_cols);
1765                                 ypan_up(vc, count);
1766                                 if (vc->vc_rows - b > 0)
1767                                         fbcon_bmove(vc, b - count, 0, b, 0,
1768                                                     vc->vc_rows - b,
1769                                                     vc->vc_cols);
1770                         } else if (info->flags & FBINFO_READS_FAST)
1771                                 fbcon_bmove(vc, t + count, 0, t, 0,
1772                                             b - t - count, vc->vc_cols);
1773                         else
1774                                 goto redraw_up;
1775                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1776                         break;
1777
1778                 case SCROLL_REDRAW:
1779                       redraw_up:
1780                         fbcon_redraw(vc, p, t, b - t - count,
1781                                      count * vc->vc_cols);
1782                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1783                         scr_memsetw((unsigned short *) (vc->vc_origin +
1784                                                         vc->vc_size_row *
1785                                                         (b - count)),
1786                                     vc->vc_video_erase_char,
1787                                     vc->vc_size_row * count);
1788                         return 1;
1789                 }
1790                 break;
1791
1792         case SM_DOWN:
1793                 if (count > vc->vc_rows)        /* Maximum realistic size */
1794                         count = vc->vc_rows;
1795                 if (logo_shown >= 0)
1796                         goto redraw_down;
1797                 switch (p->scrollmode) {
1798                 case SCROLL_MOVE:
1799                         ops->bmove(vc, info, t, 0, t + count, 0,
1800                                     b - t - count, vc->vc_cols);
1801                         ops->clear(vc, info, t, 0, count, vc->vc_cols);
1802                         break;
1803
1804                 case SCROLL_WRAP_MOVE:
1805                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1806                                 if (vc->vc_rows - b > 0)
1807                                         fbcon_bmove(vc, b, 0, b - count, 0,
1808                                                     vc->vc_rows - b,
1809                                                     vc->vc_cols);
1810                                 ywrap_down(vc, count);
1811                                 if (t > 0)
1812                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1813                                                     vc->vc_cols);
1814                         } else if (info->flags & FBINFO_READS_FAST)
1815                                 fbcon_bmove(vc, t, 0, t + count, 0,
1816                                             b - t - count, vc->vc_cols);
1817                         else
1818                                 goto redraw_down;
1819                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1820                         break;
1821
1822                 case SCROLL_PAN_MOVE:
1823                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1824                             && ((!scroll_partial && (b - t == vc->vc_rows))
1825                                 || (scroll_partial
1826                                     && (b - t - count >
1827                                         3 * vc->vc_rows >> 2)))) {
1828                                 if (vc->vc_rows - b > 0)
1829                                         fbcon_bmove(vc, b, 0, b - count, 0,
1830                                                     vc->vc_rows - b,
1831                                                     vc->vc_cols);
1832                                 ypan_down(vc, count);
1833                                 if (t > 0)
1834                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1835                                                     vc->vc_cols);
1836                         } else if (info->flags & FBINFO_READS_FAST)
1837                                 fbcon_bmove(vc, t, 0, t + count, 0,
1838                                             b - t - count, vc->vc_cols);
1839                         else
1840                                 goto redraw_down;
1841                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1842                         break;
1843
1844                 case SCROLL_PAN_REDRAW:
1845                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1846                             && ((!scroll_partial && (b - t == vc->vc_rows))
1847                                 || (scroll_partial
1848                                     && (b - t - count >
1849                                         3 * vc->vc_rows >> 2)))) {
1850                                 if (vc->vc_rows - b > 0)
1851                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1852                                                           b - count);
1853                                 ypan_down_redraw(vc, t, count);
1854                                 if (t > 0)
1855                                         fbcon_redraw_move(vc, p, count, t, 0);
1856                         } else
1857                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1858                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1859                         break;
1860
1861                 case SCROLL_REDRAW:
1862                       redraw_down:
1863                         fbcon_redraw(vc, p, b - 1, b - t - count,
1864                                      -count * vc->vc_cols);
1865                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1866                         scr_memsetw((unsigned short *) (vc->vc_origin +
1867                                                         vc->vc_size_row *
1868                                                         t),
1869                                     vc->vc_video_erase_char,
1870                                     vc->vc_size_row * count);
1871                         return 1;
1872                 }
1873         }
1874         return 0;
1875 }
1876
1877
1878 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1879                         int height, int width)
1880 {
1881         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1882         struct display *p = &fb_display[vc->vc_num];
1883
1884         if (fbcon_is_inactive(vc, info))
1885                 return;
1886
1887         if (!width || !height)
1888                 return;
1889
1890         /*  Split blits that cross physical y_wrap case.
1891          *  Pathological case involves 4 blits, better to use recursive
1892          *  code rather than unrolled case
1893          *
1894          *  Recursive invocations don't need to erase the cursor over and
1895          *  over again, so we use fbcon_bmove_rec()
1896          */
1897         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1898                         p->vrows - p->yscroll);
1899 }
1900
1901 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
1902                             int dy, int dx, int height, int width, u_int y_break)
1903 {
1904         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1905         struct fbcon_ops *ops = info->fbcon_par;
1906         u_int b;
1907
1908         if (sy < y_break && sy + height > y_break) {
1909                 b = y_break - sy;
1910                 if (dy < sy) {  /* Avoid trashing self */
1911                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1912                                         y_break);
1913                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1914                                         height - b, width, y_break);
1915                 } else {
1916                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1917                                         height - b, width, y_break);
1918                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1919                                         y_break);
1920                 }
1921                 return;
1922         }
1923
1924         if (dy < y_break && dy + height > y_break) {
1925                 b = y_break - dy;
1926                 if (dy < sy) {  /* Avoid trashing self */
1927                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1928                                         y_break);
1929                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1930                                         height - b, width, y_break);
1931                 } else {
1932                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1933                                         height - b, width, y_break);
1934                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1935                                         y_break);
1936                 }
1937                 return;
1938         }
1939         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1940                    height, width);
1941 }
1942
1943 static __inline__ void updatescrollmode(struct display *p,
1944                                         struct fb_info *info,
1945                                         struct vc_data *vc)
1946 {
1947         struct fbcon_ops *ops = info->fbcon_par;
1948         int fh = vc->vc_font.height;
1949         int cap = info->flags;
1950         u16 t = 0;
1951         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
1952                                   info->fix.xpanstep);
1953         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
1954         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1955         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1956                                    info->var.xres_virtual);
1957         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
1958                 divides(ypan, vc->vc_font.height) && vyres > yres;
1959         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
1960                 divides(ywrap, vc->vc_font.height) &&
1961                 divides(vc->vc_font.height, vyres) &&
1962                 divides(vc->vc_font.height, yres);
1963         int reading_fast = cap & FBINFO_READS_FAST;
1964         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
1965                 !(cap & FBINFO_HWACCEL_DISABLED);
1966         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
1967                 !(cap & FBINFO_HWACCEL_DISABLED);
1968
1969         p->vrows = vyres/fh;
1970         if (yres > (fh * (vc->vc_rows + 1)))
1971                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
1972         if ((yres % fh) && (vyres % fh < yres % fh))
1973                 p->vrows--;
1974
1975         if (good_wrap || good_pan) {
1976                 if (reading_fast || fast_copyarea)
1977                         p->scrollmode = good_wrap ?
1978                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
1979                 else
1980                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
1981                                 SCROLL_PAN_REDRAW;
1982         } else {
1983                 if (reading_fast || (fast_copyarea && !fast_imageblit))
1984                         p->scrollmode = SCROLL_MOVE;
1985                 else
1986                         p->scrollmode = SCROLL_REDRAW;
1987         }
1988 }
1989
1990 static int fbcon_resize(struct vc_data *vc, unsigned int width,
1991                         unsigned int height)
1992 {
1993         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1994         struct fbcon_ops *ops = info->fbcon_par;
1995         struct display *p = &fb_display[vc->vc_num];
1996         struct fb_var_screeninfo var = info->var;
1997         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
1998
1999         virt_w = FBCON_SWAP(ops->rotate, width, height);
2000         virt_h = FBCON_SWAP(ops->rotate, height, width);
2001         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2002                                  vc->vc_font.height);
2003         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2004                                  vc->vc_font.width);
2005         var.xres = virt_w * virt_fw;
2006         var.yres = virt_h * virt_fh;
2007         x_diff = info->var.xres - var.xres;
2008         y_diff = info->var.yres - var.yres;
2009         if (x_diff < 0 || x_diff > virt_fw ||
2010             y_diff < 0 || y_diff > virt_fh) {
2011                 struct fb_videomode *mode;
2012
2013                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2014                 mode = fb_find_best_mode(&var, &info->modelist);
2015                 if (mode == NULL)
2016                         return -EINVAL;
2017                 display_to_var(&var, p);
2018                 fb_videomode_to_var(&var, mode);
2019
2020                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2021                         return -EINVAL;
2022
2023                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2024                 if (CON_IS_VISIBLE(vc)) {
2025                         var.activate = FB_ACTIVATE_NOW |
2026                                 FB_ACTIVATE_FORCE;
2027                         fb_set_var(info, &var);
2028                 }
2029                 var_to_display(p, &info->var, info);
2030                 ops->var = info->var;
2031         }
2032         updatescrollmode(p, info, vc);
2033         return 0;
2034 }
2035
2036 static int fbcon_switch(struct vc_data *vc)
2037 {
2038         struct fb_info *info, *old_info = NULL;
2039         struct fbcon_ops *ops;
2040         struct display *p = &fb_display[vc->vc_num];
2041         struct fb_var_screeninfo var;
2042         int i, prev_console, charcnt = 256;
2043
2044         info = registered_fb[con2fb_map[vc->vc_num]];
2045         ops = info->fbcon_par;
2046
2047         if (softback_top) {
2048                 if (softback_lines)
2049                         fbcon_set_origin(vc);
2050                 softback_top = softback_curr = softback_in = softback_buf;
2051                 softback_lines = 0;
2052                 fbcon_update_softback(vc);
2053         }
2054
2055         if (logo_shown >= 0) {
2056                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2057
2058                 if (conp2->vc_top == logo_lines
2059                     && conp2->vc_bottom == conp2->vc_rows)
2060                         conp2->vc_top = 0;
2061                 logo_shown = FBCON_LOGO_CANSHOW;
2062         }
2063
2064         prev_console = ops->currcon;
2065         if (prev_console != -1)
2066                 old_info = registered_fb[con2fb_map[prev_console]];
2067         /*
2068          * FIXME: If we have multiple fbdev's loaded, we need to
2069          * update all info->currcon.  Perhaps, we can place this
2070          * in a centralized structure, but this might break some
2071          * drivers.
2072          *
2073          * info->currcon = vc->vc_num;
2074          */
2075         for (i = 0; i < FB_MAX; i++) {
2076                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2077                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2078
2079                         o->currcon = vc->vc_num;
2080                 }
2081         }
2082         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2083         display_to_var(&var, p);
2084         var.activate = FB_ACTIVATE_NOW;
2085
2086         /*
2087          * make sure we don't unnecessarily trip the memcmp()
2088          * in fb_set_var()
2089          */
2090         info->var.activate = var.activate;
2091         var.yoffset = info->var.yoffset;
2092         var.xoffset = info->var.xoffset;
2093         var.vmode = info->var.vmode;
2094         fb_set_var(info, &var);
2095         ops->var = info->var;
2096
2097         if (old_info != NULL && (old_info != info ||
2098                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2099                 if (info->fbops->fb_set_par)
2100                         info->fbops->fb_set_par(info);
2101
2102                 if (old_info != info) {
2103                         fbcon_del_cursor_timer(old_info);
2104                         fbcon_add_cursor_timer(info);
2105                 }
2106         }
2107
2108         set_blitting_type(vc, info);
2109         ops->cursor_reset = 1;
2110
2111         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2112                 ops->rotate = FB_ROTATE_UR;
2113                 set_blitting_type(vc, info);
2114         }
2115
2116         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2117         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2118
2119         if (p->userfont)
2120                 charcnt = FNTCHARCNT(vc->vc_font.data);
2121
2122         if (charcnt > 256)
2123                 vc->vc_complement_mask <<= 1;
2124
2125         updatescrollmode(p, info, vc);
2126
2127         switch (p->scrollmode) {
2128         case SCROLL_WRAP_MOVE:
2129                 scrollback_phys_max = p->vrows - vc->vc_rows;
2130                 break;
2131         case SCROLL_PAN_MOVE:
2132         case SCROLL_PAN_REDRAW:
2133                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2134                 if (scrollback_phys_max < 0)
2135                         scrollback_phys_max = 0;
2136                 break;
2137         default:
2138                 scrollback_phys_max = 0;
2139                 break;
2140         }
2141
2142         scrollback_max = 0;
2143         scrollback_current = 0;
2144
2145         if (!fbcon_is_inactive(vc, info)) {
2146             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2147             ops->update_start(info);
2148         }
2149
2150         fbcon_set_palette(vc, color_table);
2151         fbcon_clear_margins(vc, 0);
2152
2153         if (logo_shown == FBCON_LOGO_DRAW) {
2154
2155                 logo_shown = fg_console;
2156                 /* This is protected above by initmem_freed */
2157                 fb_show_logo(info, ops->rotate);
2158                 update_region(vc,
2159                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2160                               vc->vc_size_row * (vc->vc_bottom -
2161                                                  vc->vc_top) / 2);
2162                 return 0;
2163         }
2164         return 1;
2165 }
2166
2167 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2168                                 int blank)
2169 {
2170         if (blank) {
2171                 unsigned short charmask = vc->vc_hi_font_mask ?
2172                         0x1ff : 0xff;
2173                 unsigned short oldc;
2174
2175                 oldc = vc->vc_video_erase_char;
2176                 vc->vc_video_erase_char &= charmask;
2177                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2178                 vc->vc_video_erase_char = oldc;
2179         }
2180 }
2181
2182 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2183 {
2184         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2185         struct fbcon_ops *ops = info->fbcon_par;
2186
2187         if (mode_switch) {
2188                 struct fb_var_screeninfo var = info->var;
2189
2190                 ops->graphics = 1;
2191
2192                 if (!blank) {
2193                         if (info->fbops->fb_save_state)
2194                                 info->fbops->fb_save_state(info);
2195                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2196                         fb_set_var(info, &var);
2197                         ops->graphics = 0;
2198                         ops->var = info->var;
2199                 } else if (info->fbops->fb_restore_state)
2200                         info->fbops->fb_restore_state(info);
2201         }
2202
2203         if (!fbcon_is_inactive(vc, info)) {
2204                 if (ops->blank_state != blank) {
2205                         ops->blank_state = blank;
2206                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2207                         ops->cursor_flash = (!blank);
2208
2209                         if (fb_blank(info, blank))
2210                                 fbcon_generic_blank(vc, info, blank);
2211                 }
2212
2213                 if (!blank)
2214                         update_screen(vc);
2215         }
2216
2217         if (!blank)
2218                 fbcon_add_cursor_timer(info);
2219         else
2220                 fbcon_del_cursor_timer(info);
2221
2222         return 0;
2223 }
2224
2225 static void fbcon_free_font(struct display *p)
2226 {
2227         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
2228                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
2229         p->fontdata = NULL;
2230         p->userfont = 0;
2231 }
2232
2233 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2234 {
2235         u8 *fontdata = vc->vc_font.data;
2236         u8 *data = font->data;
2237         int i, j;
2238
2239         font->width = vc->vc_font.width;
2240         font->height = vc->vc_font.height;
2241         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2242         if (!font->data)
2243                 return 0;
2244
2245         if (font->width <= 8) {
2246                 j = vc->vc_font.height;
2247                 for (i = 0; i < font->charcount; i++) {
2248                         memcpy(data, fontdata, j);
2249                         memset(data + j, 0, 32 - j);
2250                         data += 32;
2251                         fontdata += j;
2252                 }
2253         } else if (font->width <= 16) {
2254                 j = vc->vc_font.height * 2;
2255                 for (i = 0; i < font->charcount; i++) {
2256                         memcpy(data, fontdata, j);
2257                         memset(data + j, 0, 64 - j);
2258                         data += 64;
2259                         fontdata += j;
2260                 }
2261         } else if (font->width <= 24) {
2262                 for (i = 0; i < font->charcount; i++) {
2263                         for (j = 0; j < vc->vc_font.height; j++) {
2264                                 *data++ = fontdata[0];
2265                                 *data++ = fontdata[1];
2266                                 *data++ = fontdata[2];
2267                                 fontdata += sizeof(u32);
2268                         }
2269                         memset(data, 0, 3 * (32 - j));
2270                         data += 3 * (32 - j);
2271                 }
2272         } else {
2273                 j = vc->vc_font.height * 4;
2274                 for (i = 0; i < font->charcount; i++) {
2275                         memcpy(data, fontdata, j);
2276                         memset(data + j, 0, 128 - j);
2277                         data += 128;
2278                         fontdata += j;
2279                 }
2280         }
2281         return 0;
2282 }
2283
2284 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2285                              const u8 * data, int userfont)
2286 {
2287         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2288         struct fbcon_ops *ops = info->fbcon_par;
2289         struct display *p = &fb_display[vc->vc_num];
2290         int resize;
2291         int cnt;
2292         char *old_data = NULL;
2293
2294         if (CON_IS_VISIBLE(vc) && softback_lines)
2295                 fbcon_set_origin(vc);
2296
2297         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2298         if (p->userfont)
2299                 old_data = vc->vc_font.data;
2300         if (userfont)
2301                 cnt = FNTCHARCNT(data);
2302         else
2303                 cnt = 256;
2304         vc->vc_font.data = (void *)(p->fontdata = data);
2305         if ((p->userfont = userfont))
2306                 REFCOUNT(data)++;
2307         vc->vc_font.width = w;
2308         vc->vc_font.height = h;
2309         if (vc->vc_hi_font_mask && cnt == 256) {
2310                 vc->vc_hi_font_mask = 0;
2311                 if (vc->vc_can_do_color) {
2312                         vc->vc_complement_mask >>= 1;
2313                         vc->vc_s_complement_mask >>= 1;
2314                 }
2315
2316                 /* ++Edmund: reorder the attribute bits */
2317                 if (vc->vc_can_do_color) {
2318                         unsigned short *cp =
2319                             (unsigned short *) vc->vc_origin;
2320                         int count = vc->vc_screenbuf_size / 2;
2321                         unsigned short c;
2322                         for (; count > 0; count--, cp++) {
2323                                 c = scr_readw(cp);
2324                                 scr_writew(((c & 0xfe00) >> 1) |
2325                                            (c & 0xff), cp);
2326                         }
2327                         c = vc->vc_video_erase_char;
2328                         vc->vc_video_erase_char =
2329                             ((c & 0xfe00) >> 1) | (c & 0xff);
2330                         vc->vc_attr >>= 1;
2331                 }
2332         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2333                 vc->vc_hi_font_mask = 0x100;
2334                 if (vc->vc_can_do_color) {
2335                         vc->vc_complement_mask <<= 1;
2336                         vc->vc_s_complement_mask <<= 1;
2337                 }
2338
2339                 /* ++Edmund: reorder the attribute bits */
2340                 {
2341                         unsigned short *cp =
2342                             (unsigned short *) vc->vc_origin;
2343                         int count = vc->vc_screenbuf_size / 2;
2344                         unsigned short c;
2345                         for (; count > 0; count--, cp++) {
2346                                 unsigned short newc;
2347                                 c = scr_readw(cp);
2348                                 if (vc->vc_can_do_color)
2349                                         newc =
2350                                             ((c & 0xff00) << 1) | (c &
2351                                                                    0xff);
2352                                 else
2353                                         newc = c & ~0x100;
2354                                 scr_writew(newc, cp);
2355                         }
2356                         c = vc->vc_video_erase_char;
2357                         if (vc->vc_can_do_color) {
2358                                 vc->vc_video_erase_char =
2359                                     ((c & 0xff00) << 1) | (c & 0xff);
2360                                 vc->vc_attr <<= 1;
2361                         } else
2362                                 vc->vc_video_erase_char = c & ~0x100;
2363                 }
2364
2365         }
2366
2367         if (resize) {
2368                 int cols, rows;
2369
2370                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2371                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2372                 cols /= w;
2373                 rows /= h;
2374                 vc_resize(vc, cols, rows);
2375                 if (CON_IS_VISIBLE(vc) && softback_buf)
2376                         fbcon_update_softback(vc);
2377         } else if (CON_IS_VISIBLE(vc)
2378                    && vc->vc_mode == KD_TEXT) {
2379                 fbcon_clear_margins(vc, 0);
2380                 update_screen(vc);
2381         }
2382
2383         if (old_data && (--REFCOUNT(old_data) == 0))
2384                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2385         return 0;
2386 }
2387
2388 static int fbcon_copy_font(struct vc_data *vc, int con)
2389 {
2390         struct display *od = &fb_display[con];
2391         struct console_font *f = &vc->vc_font;
2392
2393         if (od->fontdata == f->data)
2394                 return 0;       /* already the same font... */
2395         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2396 }
2397
2398 /*
2399  *  User asked to set font; we are guaranteed that
2400  *      a) width and height are in range 1..32
2401  *      b) charcount does not exceed 512
2402  *  but lets not assume that, since someone might someday want to use larger
2403  *  fonts. And charcount of 512 is small for unicode support.
2404  *
2405  *  However, user space gives the font in 32 rows , regardless of
2406  *  actual font height. So a new API is needed if support for larger fonts
2407  *  is ever implemented.
2408  */
2409
2410 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2411 {
2412         unsigned charcount = font->charcount;
2413         int w = font->width;
2414         int h = font->height;
2415         int size;
2416         int i, csum;
2417         u8 *new_data, *data = font->data;
2418         int pitch = (font->width+7) >> 3;
2419
2420         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2421          * If not this check should be changed to charcount < 256 */
2422         if (charcount != 256 && charcount != 512)
2423                 return -EINVAL;
2424
2425         size = h * pitch * charcount;
2426
2427         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2428
2429         if (!new_data)
2430                 return -ENOMEM;
2431
2432         new_data += FONT_EXTRA_WORDS * sizeof(int);
2433         FNTSIZE(new_data) = size;
2434         FNTCHARCNT(new_data) = charcount;
2435         REFCOUNT(new_data) = 0; /* usage counter */
2436         for (i=0; i< charcount; i++) {
2437                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2438         }
2439
2440         /* Since linux has a nice crc32 function use it for counting font
2441          * checksums. */
2442         csum = crc32(0, new_data, size);
2443
2444         FNTSUM(new_data) = csum;
2445         /* Check if the same font is on some other console already */
2446         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2447                 struct vc_data *tmp = vc_cons[i].d;
2448
2449                 if (fb_display[i].userfont &&
2450                     fb_display[i].fontdata &&
2451                     FNTSUM(fb_display[i].fontdata) == csum &&
2452                     FNTSIZE(fb_display[i].fontdata) == size &&
2453                     tmp->vc_font.width == w &&
2454                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2455                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2456                         new_data = (u8 *)fb_display[i].fontdata;
2457                         break;
2458                 }
2459         }
2460         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2461 }
2462
2463 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2464 {
2465         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2466         const struct font_desc *f;
2467
2468         if (!name)
2469                 f = get_default_font(info->var.xres, info->var.yres);
2470         else if (!(f = find_font(name)))
2471                 return -ENOENT;
2472
2473         font->width = f->width;
2474         font->height = f->height;
2475         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2476 }
2477
2478 static u16 palette_red[16];
2479 static u16 palette_green[16];
2480 static u16 palette_blue[16];
2481
2482 static struct fb_cmap palette_cmap = {
2483         0, 16, palette_red, palette_green, palette_blue, NULL
2484 };
2485
2486 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
2487 {
2488         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2489         int i, j, k, depth;
2490         u8 val;
2491
2492         if (fbcon_is_inactive(vc, info))
2493                 return -EINVAL;
2494
2495         if (!CON_IS_VISIBLE(vc))
2496                 return 0;
2497
2498         depth = fb_get_color_depth(&info->var, &info->fix);
2499         if (depth > 3) {
2500                 for (i = j = 0; i < 16; i++) {
2501                         k = table[i];
2502                         val = vc->vc_palette[j++];
2503                         palette_red[k] = (val << 8) | val;
2504                         val = vc->vc_palette[j++];
2505                         palette_green[k] = (val << 8) | val;
2506                         val = vc->vc_palette[j++];
2507                         palette_blue[k] = (val << 8) | val;
2508                 }
2509                 palette_cmap.len = 16;
2510                 palette_cmap.start = 0;
2511         /*
2512          * If framebuffer is capable of less than 16 colors,
2513          * use default palette of fbcon.
2514          */
2515         } else
2516                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2517
2518         return fb_set_cmap(&palette_cmap, info);
2519 }
2520
2521 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2522 {
2523         unsigned long p;
2524         int line;
2525
2526         if (vc->vc_num != fg_console || !softback_lines)
2527                 return (u16 *) (vc->vc_origin + offset);
2528         line = offset / vc->vc_size_row;
2529         if (line >= softback_lines)
2530                 return (u16 *) (vc->vc_origin + offset -
2531                                 softback_lines * vc->vc_size_row);
2532         p = softback_curr + offset;
2533         if (p >= softback_end)
2534                 p += softback_buf - softback_end;
2535         return (u16 *) p;
2536 }
2537
2538 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2539                                  int *px, int *py)
2540 {
2541         unsigned long ret;
2542         int x, y;
2543
2544         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2545                 unsigned long offset = (pos - vc->vc_origin) / 2;
2546
2547                 x = offset % vc->vc_cols;
2548                 y = offset / vc->vc_cols;
2549                 if (vc->vc_num == fg_console)
2550                         y += softback_lines;
2551                 ret = pos + (vc->vc_cols - x) * 2;
2552         } else if (vc->vc_num == fg_console && softback_lines) {
2553                 unsigned long offset = pos - softback_curr;
2554
2555                 if (pos < softback_curr)
2556                         offset += softback_end - softback_buf;
2557                 offset /= 2;
2558                 x = offset % vc->vc_cols;
2559                 y = offset / vc->vc_cols;
2560                 ret = pos + (vc->vc_cols - x) * 2;
2561                 if (ret == softback_end)
2562                         ret = softback_buf;
2563                 if (ret == softback_in)
2564                         ret = vc->vc_origin;
2565         } else {
2566                 /* Should not happen */
2567                 x = y = 0;
2568                 ret = vc->vc_origin;
2569         }
2570         if (px)
2571                 *px = x;
2572         if (py)
2573                 *py = y;
2574         return ret;
2575 }
2576
2577 /* As we might be inside of softback, we may work with non-contiguous buffer,
2578    that's why we have to use a separate routine. */
2579 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2580 {
2581         while (cnt--) {
2582                 u16 a = scr_readw(p);
2583                 if (!vc->vc_can_do_color)
2584                         a ^= 0x0800;
2585                 else if (vc->vc_hi_font_mask == 0x100)
2586                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2587                             (((a) & 0x0e00) << 4);
2588                 else
2589                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2590                             (((a) & 0x0700) << 4);
2591                 scr_writew(a, p++);
2592                 if (p == (u16 *) softback_end)
2593                         p = (u16 *) softback_buf;
2594                 if (p == (u16 *) softback_in)
2595                         p = (u16 *) vc->vc_origin;
2596         }
2597 }
2598
2599 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
2600 {
2601         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2602         struct fbcon_ops *ops = info->fbcon_par;
2603         struct display *p = &fb_display[fg_console];
2604         int offset, limit, scrollback_old;
2605
2606         if (softback_top) {
2607                 if (vc->vc_num != fg_console)
2608                         return 0;
2609                 if (vc->vc_mode != KD_TEXT || !lines)
2610                         return 0;
2611                 if (logo_shown >= 0) {
2612                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2613
2614                         if (conp2->vc_top == logo_lines
2615                             && conp2->vc_bottom == conp2->vc_rows)
2616                                 conp2->vc_top = 0;
2617                         if (logo_shown == vc->vc_num) {
2618                                 unsigned long p, q;
2619                                 int i;
2620
2621                                 p = softback_in;
2622                                 q = vc->vc_origin +
2623                                     logo_lines * vc->vc_size_row;
2624                                 for (i = 0; i < logo_lines; i++) {
2625                                         if (p == softback_top)
2626                                                 break;
2627                                         if (p == softback_buf)
2628                                                 p = softback_end;
2629                                         p -= vc->vc_size_row;
2630                                         q -= vc->vc_size_row;
2631                                         scr_memcpyw((u16 *) q, (u16 *) p,
2632                                                     vc->vc_size_row);
2633                                 }
2634                                 softback_in = softback_curr = p;
2635                                 update_region(vc, vc->vc_origin,
2636                                               logo_lines * vc->vc_cols);
2637                         }
2638                         logo_shown = FBCON_LOGO_CANSHOW;
2639                 }
2640                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2641                 fbcon_redraw_softback(vc, p, lines);
2642                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2643                 return 0;
2644         }
2645
2646         if (!scrollback_phys_max)
2647                 return -ENOSYS;
2648
2649         scrollback_old = scrollback_current;
2650         scrollback_current -= lines;
2651         if (scrollback_current < 0)
2652                 scrollback_current = 0;
2653         else if (scrollback_current > scrollback_max)
2654                 scrollback_current = scrollback_max;
2655         if (scrollback_current == scrollback_old)
2656                 return 0;
2657
2658         if (fbcon_is_inactive(vc, info))
2659                 return 0;
2660
2661         fbcon_cursor(vc, CM_ERASE);
2662
2663         offset = p->yscroll - scrollback_current;
2664         limit = p->vrows;
2665         switch (p->scrollmode) {
2666         case SCROLL_WRAP_MOVE:
2667                 info->var.vmode |= FB_VMODE_YWRAP;
2668                 break;
2669         case SCROLL_PAN_MOVE:
2670         case SCROLL_PAN_REDRAW:
2671                 limit -= vc->vc_rows;
2672                 info->var.vmode &= ~FB_VMODE_YWRAP;
2673                 break;
2674         }
2675         if (offset < 0)
2676                 offset += limit;
2677         else if (offset >= limit)
2678                 offset -= limit;
2679
2680         ops->var.xoffset = 0;
2681         ops->var.yoffset = offset * vc->vc_font.height;
2682         ops->update_start(info);
2683
2684         if (!scrollback_current)
2685                 fbcon_cursor(vc, CM_DRAW);
2686         return 0;
2687 }
2688
2689 static int fbcon_set_origin(struct vc_data *vc)
2690 {
2691         if (softback_lines)
2692                 fbcon_scrolldelta(vc, softback_lines);
2693         return 0;
2694 }
2695
2696 static void fbcon_suspended(struct fb_info *info)
2697 {
2698         struct vc_data *vc = NULL;
2699         struct fbcon_ops *ops = info->fbcon_par;
2700
2701         if (!ops || ops->currcon < 0)
2702                 return;
2703         vc = vc_cons[ops->currcon].d;
2704
2705         /* Clear cursor, restore saved data */
2706         fbcon_cursor(vc, CM_ERASE);
2707 }
2708
2709 static void fbcon_resumed(struct fb_info *info)
2710 {
2711         struct vc_data *vc;
2712         struct fbcon_ops *ops = info->fbcon_par;
2713
2714         if (!ops || ops->currcon < 0)
2715                 return;
2716         vc = vc_cons[ops->currcon].d;
2717
2718         update_screen(vc);
2719 }
2720
2721 static void fbcon_modechanged(struct fb_info *info)
2722 {
2723         struct fbcon_ops *ops = info->fbcon_par;
2724         struct vc_data *vc;
2725         struct display *p;
2726         int rows, cols;
2727
2728         if (!ops || ops->currcon < 0)
2729                 return;
2730         vc = vc_cons[ops->currcon].d;
2731         if (vc->vc_mode != KD_TEXT ||
2732             registered_fb[con2fb_map[ops->currcon]] != info)
2733                 return;
2734
2735         p = &fb_display[vc->vc_num];
2736         set_blitting_type(vc, info);
2737
2738         if (CON_IS_VISIBLE(vc)) {
2739                 var_to_display(p, &info->var, info);
2740                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2741                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2742                 cols /= vc->vc_font.width;
2743                 rows /= vc->vc_font.height;
2744                 vc_resize(vc, cols, rows);
2745                 updatescrollmode(p, info, vc);
2746                 scrollback_max = 0;
2747                 scrollback_current = 0;
2748
2749                 if (!fbcon_is_inactive(vc, info)) {
2750                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2751                     ops->update_start(info);
2752                 }
2753
2754                 fbcon_set_palette(vc, color_table);
2755                 update_screen(vc);
2756                 if (softback_buf)
2757                         fbcon_update_softback(vc);
2758         }
2759 }
2760
2761 static void fbcon_set_all_vcs(struct fb_info *info)
2762 {
2763         struct fbcon_ops *ops = info->fbcon_par;
2764         struct vc_data *vc;
2765         struct display *p;
2766         int i, rows, cols;
2767
2768         if (!ops || ops->currcon < 0)
2769                 return;
2770
2771         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2772                 vc = vc_cons[i].d;
2773                 if (!vc || vc->vc_mode != KD_TEXT ||
2774                     registered_fb[con2fb_map[i]] != info)
2775                         continue;
2776
2777                 p = &fb_display[vc->vc_num];
2778                 set_blitting_type(vc, info);
2779                 var_to_display(p, &info->var, info);
2780                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2781                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2782                 cols /= vc->vc_font.width;
2783                 rows /= vc->vc_font.height;
2784                 vc_resize(vc, cols, rows);
2785
2786                 if (CON_IS_VISIBLE(vc)) {
2787                         updatescrollmode(p, info, vc);
2788                         scrollback_max = 0;
2789                         scrollback_current = 0;
2790
2791                         if (!fbcon_is_inactive(vc, info)) {
2792                             ops->var.xoffset = ops->var.yoffset =
2793                                 p->yscroll = 0;
2794                             ops->update_start(info);
2795                         }
2796
2797                         fbcon_set_palette(vc, color_table);
2798                         update_screen(vc);
2799                         if (softback_buf)
2800                                 fbcon_update_softback(vc);
2801                 }
2802         }
2803
2804         ops->p = &fb_display[ops->currcon];
2805 }
2806
2807 static int fbcon_mode_deleted(struct fb_info *info,
2808                               struct fb_videomode *mode)
2809 {
2810         struct fb_info *fb_info;
2811         struct display *p;
2812         int i, j, found = 0;
2813
2814         /* before deletion, ensure that mode is not in use */
2815         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2816                 j = con2fb_map[i];
2817                 if (j == -1)
2818                         continue;
2819                 fb_info = registered_fb[j];
2820                 if (fb_info != info)
2821                         continue;
2822                 p = &fb_display[i];
2823                 if (!p || !p->mode)
2824                         continue;
2825                 if (fb_mode_is_equal(p->mode, mode)) {
2826                         found = 1;
2827                         break;
2828                 }
2829         }
2830         return found;
2831 }
2832
2833 static int fbcon_fb_registered(int idx)
2834 {
2835         int ret = 0, i;
2836
2837         if (info_idx == -1) {
2838                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2839                         if (con2fb_map_boot[i] == idx) {
2840                                 info_idx = idx;
2841                                 break;
2842                         }
2843                 }
2844                 if (info_idx != -1)
2845                         ret = fbcon_takeover(1);
2846         } else {
2847                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2848                         if (con2fb_map_boot[i] == idx)
2849                                 set_con2fb_map(i, idx, 0);
2850                 }
2851         }
2852
2853         return ret;
2854 }
2855
2856 static void fbcon_fb_blanked(struct fb_info *info, int blank)
2857 {
2858         struct fbcon_ops *ops = info->fbcon_par;
2859         struct vc_data *vc;
2860
2861         if (!ops || ops->currcon < 0)
2862                 return;
2863
2864         vc = vc_cons[ops->currcon].d;
2865         if (vc->vc_mode != KD_TEXT ||
2866                         registered_fb[con2fb_map[ops->currcon]] != info)
2867                 return;
2868
2869         if (CON_IS_VISIBLE(vc)) {
2870                 if (blank)
2871                         do_blank_screen(0);
2872                 else
2873                         do_unblank_screen(0);
2874         }
2875         ops->blank_state = blank;
2876 }
2877
2878 static void fbcon_new_modelist(struct fb_info *info)
2879 {
2880         int i;
2881         struct vc_data *vc;
2882         struct fb_var_screeninfo var;
2883         struct fb_videomode *mode;
2884
2885         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2886                 if (registered_fb[con2fb_map[i]] != info)
2887                         continue;
2888                 if (!fb_display[i].mode)
2889                         continue;
2890                 vc = vc_cons[i].d;
2891                 display_to_var(&var, &fb_display[i]);
2892                 mode = fb_find_nearest_mode(fb_display[i].mode,
2893                                             &info->modelist);
2894                 fb_videomode_to_var(&var, mode);
2895
2896                 if (vc)
2897                         fbcon_set_disp(info, &var, vc);
2898                 else
2899                         fbcon_preset_disp(info, &var, i);
2900
2901         }
2902 }
2903
2904 static int fbcon_event_notify(struct notifier_block *self,
2905                               unsigned long action, void *data)
2906 {
2907         struct fb_event *event = data;
2908         struct fb_info *info = event->info;
2909         struct fb_videomode *mode;
2910         struct fb_con2fbmap *con2fb;
2911         int ret = 0;
2912
2913         switch(action) {
2914         case FB_EVENT_SUSPEND:
2915                 fbcon_suspended(info);
2916                 break;
2917         case FB_EVENT_RESUME:
2918                 fbcon_resumed(info);
2919                 break;
2920         case FB_EVENT_MODE_CHANGE:
2921                 fbcon_modechanged(info);
2922                 break;
2923         case FB_EVENT_MODE_CHANGE_ALL:
2924                 fbcon_set_all_vcs(info);
2925                 break;
2926         case FB_EVENT_MODE_DELETE:
2927                 mode = event->data;
2928                 ret = fbcon_mode_deleted(info, mode);
2929                 break;
2930         case FB_EVENT_FB_REGISTERED:
2931                 ret = fbcon_fb_registered(info->node);
2932                 break;
2933         case FB_EVENT_SET_CONSOLE_MAP:
2934                 con2fb = event->data;
2935                 ret = set_con2fb_map(con2fb->console - 1,
2936                                      con2fb->framebuffer, 1);
2937                 break;
2938         case FB_EVENT_GET_CONSOLE_MAP:
2939                 con2fb = event->data;
2940                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
2941                 break;
2942         case FB_EVENT_BLANK:
2943                 fbcon_fb_blanked(info, *(int *)event->data);
2944                 break;
2945         case FB_EVENT_NEW_MODELIST:
2946                 fbcon_new_modelist(info);
2947                 break;
2948         case FB_EVENT_SET_CON_ROTATE:
2949                 fbcon_rotate(info, *(int *)event->data);
2950                 break;
2951         case FB_EVENT_GET_CON_ROTATE:
2952                 ret = fbcon_get_rotate(info);
2953                 break;
2954         case FB_EVENT_SET_CON_ROTATE_ALL:
2955                 fbcon_rotate_all(info, *(int *)event->data);
2956         }
2957
2958         return ret;
2959 }
2960
2961 /*
2962  *  The console `switch' structure for the frame buffer based console
2963  */
2964
2965 static const struct consw fb_con = {
2966         .owner                  = THIS_MODULE,
2967         .con_startup            = fbcon_startup,
2968         .con_init               = fbcon_init,
2969         .con_deinit             = fbcon_deinit,
2970         .con_clear              = fbcon_clear,
2971         .con_putc               = fbcon_putc,
2972         .con_putcs              = fbcon_putcs,
2973         .con_cursor             = fbcon_cursor,
2974         .con_scroll             = fbcon_scroll,
2975         .con_bmove              = fbcon_bmove,
2976         .con_switch             = fbcon_switch,
2977         .con_blank              = fbcon_blank,
2978         .con_font_set           = fbcon_set_font,
2979         .con_font_get           = fbcon_get_font,
2980         .con_font_default       = fbcon_set_def_font,
2981         .con_font_copy          = fbcon_copy_font,
2982         .con_set_palette        = fbcon_set_palette,
2983         .con_scrolldelta        = fbcon_scrolldelta,
2984         .con_set_origin         = fbcon_set_origin,
2985         .con_invert_region      = fbcon_invert_region,
2986         .con_screen_pos         = fbcon_screen_pos,
2987         .con_getxy              = fbcon_getxy,
2988         .con_resize             = fbcon_resize,
2989 };
2990
2991 static struct notifier_block fbcon_event_notifier = {
2992         .notifier_call  = fbcon_event_notify,
2993 };
2994
2995 static int __init fb_console_init(void)
2996 {
2997         int i;
2998
2999         acquire_console_sem();
3000         fb_register_client(&fbcon_event_notifier);
3001         release_console_sem();
3002
3003         for (i = 0; i < MAX_NR_CONSOLES; i++)
3004                 con2fb_map[i] = -1;
3005
3006         if (num_registered_fb) {
3007                 for (i = 0; i < FB_MAX; i++) {
3008                         if (registered_fb[i] != NULL) {
3009                                 info_idx = i;
3010                                 break;
3011                         }
3012                 }
3013                 fbcon_takeover(0);
3014         }
3015
3016         return 0;
3017 }
3018
3019 module_init(fb_console_init);
3020
3021 #ifdef MODULE
3022
3023 static void __exit fb_console_exit(void)
3024 {
3025         acquire_console_sem();
3026         fb_unregister_client(&fbcon_event_notifier);
3027         release_console_sem();
3028         give_up_console(&fb_con);
3029 }
3030
3031 module_exit(fb_console_exit);
3032
3033 #endif
3034
3035 MODULE_LICENSE("GPL");