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   1 /*
   2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1995 Geert Uytterhoeven
   5  *
   6  *
   7  *  This file is based on the original Amiga console driver (amicon.c):
   8  *
   9  *      Copyright (C) 1993 Hamish Macdonald
  10  *                         Greg Harp
  11  *      Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
  12  *
  13  *            with work by William Rucklidge (wjr@cs.cornell.edu)
  14  *                         Geert Uytterhoeven
  15  *                         Jes Sorensen (jds@kom.auc.dk)
  16  *                         Martin Apel
  17  *
  18  *  and on the original Atari console driver (atacon.c):
  19  *
  20  *      Copyright (C) 1993 Bjoern Brauel
  21  *                         Roman Hodek
  22  *
  23  *            with work by Guenther Kelleter
  24  *                         Martin Schaller
  25  *                         Andreas Schwab
  26  *
  27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
  28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
  29  *  and software scrollback added by
  30  *                         Jakub Jelinek (jj@ultra.linux.cz)
  31  *
  32  *  Random hacking by Martin Mares <mj@ucw.cz>
  33  *
  34  *      2001 - Documented with DocBook
  35  *      - Brad Douglas <brad@neruo.com>
  36  *
  37  *  The low level operations for the various display memory organizations are
  38  *  now in separate source files.
  39  *
  40  *  Currently the following organizations are supported:
  41  *
  42  *    o afb                     Amiga bitplanes
  43  *    o cfb{2,4,8,16,24,32}     Packed pixels
  44  *    o ilbm                    Amiga interleaved bitplanes
  45  *    o iplan2p[248]            Atari interleaved bitplanes
  46  *    o mfb                     Monochrome
  47  *    o vga                     VGA characters/attributes
  48  *
  49  *  To do:
  50  *
  51  *    - Implement 16 plane mode (iplan2p16)
  52  *
  53  *
  54  *  This file is subject to the terms and conditions of the GNU General Public
  55  *  License.  See the file COPYING in the main directory of this archive for
  56  *  more details.
  57  */
  58
  59 #undef FBCONDEBUG
  60
  61 #include <linux/config.h>
  62 #include <linux/module.h>
  63 #include <linux/types.h>
  64 #include <linux/sched.h>
  65 #include <linux/fs.h>
  66 #include <linux/kernel.h>
  67 #include <linux/delay.h>        /* MSch: for IRQ probe */
  68 #include <linux/tty.h>
  69 #include <linux/console.h>
  70 #include <linux/string.h>
  71 #include <linux/kd.h>
  72 #include <linux/slab.h>
  73 #include <linux/fb.h>
  74 #include <linux/vt_kern.h>
  75 #include <linux/selection.h>
  76 #include <linux/font.h>
  77 #include <linux/smp.h>
  78 #include <linux/init.h>
  79 #include <linux/interrupt.h>
  80 #include <linux/crc32.h> /* For counting font checksums */
  81 #include <asm/irq.h>
  82 #include <asm/system.h>
  83 #include <asm/uaccess.h>
  84 #ifdef CONFIG_ATARI
  85 #include <asm/atariints.h>
  86 #endif
  87 #ifdef CONFIG_MAC
  88 #include <asm/macints.h>
  89 #endif
  90 #if defined(__mc68000__) || defined(CONFIG_APUS)
  91 #include <asm/machdep.h>
  92 #include <asm/setup.h>
  93 #endif
  94
  95 #include "fbcon.h"
  96
  97 #ifdef FBCONDEBUG
  98 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
  99 #else
 100 #  define DPRINTK(fmt, args...)
 101 #endif
 102
 103 enum {
 104         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
 105         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
 106         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
 107 };
 108
 109 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 0;
 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 0;
 485                                 options++;
 486                         } else
 487                                 return 0;
 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 0;
 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 0;
 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 = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 691                 if (!ops)
 692                         err = -ENOMEM;
 693         }
 694
 695         if (!err) {
 696                 memset(ops, 0, sizeof(struct fbcon_ops));
 697                 info->fbcon_par = ops;
 698                 set_blitting_type(vc, info);
 699         }
 700
 701         if (err) {
 702                 con2fb_map[unit] = oldidx;
 703                 module_put(info->fbops->owner);
 704         }
 705
 706         return err;
 707 }
 708
 709 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 710                                   struct fb_info *newinfo, int unit,
 711                                   int oldidx, int found)
 712 {
 713         struct fbcon_ops *ops = oldinfo->fbcon_par;
 714         int err = 0;
 715
 716         if (oldinfo->fbops->fb_release &&
 717             oldinfo->fbops->fb_release(oldinfo, 0)) {
 718                 con2fb_map[unit] = oldidx;
 719                 if (!found && newinfo->fbops->fb_release)
 720                         newinfo->fbops->fb_release(newinfo, 0);
 721                 if (!found)
 722                         module_put(newinfo->fbops->owner);
 723                 err = -ENODEV;
 724         }
 725
 726         if (!err) {
 727                 fbcon_del_cursor_timer(oldinfo);
 728                 kfree(ops->cursor_state.mask);
 729                 kfree(ops->cursor_data);
 730                 kfree(ops->fontbuffer);
 731                 kfree(oldinfo->fbcon_par);
 732                 oldinfo->fbcon_par = NULL;
 733                 module_put(oldinfo->fbops->owner);
 734                 /*
 735                   If oldinfo and newinfo are driving the same hardware,
 736                   the fb_release() method of oldinfo may attempt to
 737                   restore the hardware state.  This will leave the
 738                   newinfo in an undefined state. Thus, a call to
 739                   fb_set_par() may be needed for the newinfo.
 740                 */
 741                 if (newinfo->fbops->fb_set_par)
 742                         newinfo->fbops->fb_set_par(newinfo);
 743         }
 744
 745         return err;
 746 }
 747
 748 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 749                                 int unit, int show_logo)
 750 {
 751         struct fbcon_ops *ops = info->fbcon_par;
 752
 753         ops->currcon = fg_console;
 754
 755         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT))
 756                 info->fbops->fb_set_par(info);
 757
 758         ops->flags |= FBCON_FLAGS_INIT;
 759         ops->graphics = 0;
 760
 761         if (vc)
 762                 fbcon_set_disp(info, &info->var, vc);
 763         else
 764                 fbcon_preset_disp(info, &info->var, unit);
 765
 766         if (show_logo) {
 767                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 768                 struct fb_info *fg_info =
 769                         registered_fb[con2fb_map[fg_console]];
 770
 771                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 772                                    fg_vc->vc_rows, fg_vc->vc_cols,
 773                                    fg_vc->vc_rows);
 774         }
 775
 776         update_screen(vc_cons[fg_console].d);
 777 }
 778
 779 /**
 780  *      set_con2fb_map - map console to frame buffer device
 781  *      @unit: virtual console number to map
 782  *      @newidx: frame buffer index to map virtual console to
 783  *      @user: user request
 784  *
 785  *      Maps a virtual console @unit to a frame buffer device
 786  *      @newidx.
 787  */
 788 static int set_con2fb_map(int unit, int newidx, int user)
 789 {
 790         struct vc_data *vc = vc_cons[unit].d;
 791         int oldidx = con2fb_map[unit];
 792         struct fb_info *info = registered_fb[newidx];
 793         struct fb_info *oldinfo = NULL;
 794         int found, err = 0;
 795
 796         if (oldidx == newidx)
 797                 return 0;
 798
 799         if (!info)
 800                 err =  -EINVAL;
 801
 802         if (!err && !search_for_mapped_con()) {
 803                 info_idx = newidx;
 804                 return fbcon_takeover(0);
 805         }
 806
 807         if (oldidx != -1)
 808                 oldinfo = registered_fb[oldidx];
 809
 810         found = search_fb_in_map(newidx);
 811
 812         acquire_console_sem();
 813         con2fb_map[unit] = newidx;
 814         if (!err && !found)
 815                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 816
 817
 818         /*
 819          * If old fb is not mapped to any of the consoles,
 820          * fbcon should release it.
 821          */
 822         if (!err && oldinfo && !search_fb_in_map(oldidx))
 823                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 824                                              found);
 825
 826         if (!err) {
 827                 int show_logo = (fg_console == 0 && !user &&
 828                                  logo_shown != FBCON_LOGO_DONTSHOW);
 829
 830                 if (!found)
 831                         fbcon_add_cursor_timer(info);
 832                 con2fb_map_boot[unit] = newidx;
 833                 con2fb_init_display(vc, info, unit, show_logo);
 834         }
 835
 836         release_console_sem();
 837         return err;
 838 }
 839
 840 /*
 841  *  Low Level Operations
 842  */
 843 /* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
 844 static int var_to_display(struct display *disp,
 845                           struct fb_var_screeninfo *var,
 846                           struct fb_info *info)
 847 {
 848         disp->xres_virtual = var->xres_virtual;
 849         disp->yres_virtual = var->yres_virtual;
 850         disp->bits_per_pixel = var->bits_per_pixel;
 851         disp->grayscale = var->grayscale;
 852         disp->nonstd = var->nonstd;
 853         disp->accel_flags = var->accel_flags;
 854         disp->height = var->height;
 855         disp->width = var->width;
 856         disp->red = var->red;
 857         disp->green = var->green;
 858         disp->blue = var->blue;
 859         disp->transp = var->transp;
 860         disp->rotate = var->rotate;
 861         disp->mode = fb_match_mode(var, &info->modelist);
 862         if (disp->mode == NULL)
 863                 /* This should not happen */
 864                 return -EINVAL;
 865         return 0;
 866 }
 867
 868 static void display_to_var(struct fb_var_screeninfo *var,
 869                            struct display *disp)
 870 {
 871         fb_videomode_to_var(var, disp->mode);
 872         var->xres_virtual = disp->xres_virtual;
 873         var->yres_virtual = disp->yres_virtual;
 874         var->bits_per_pixel = disp->bits_per_pixel;
 875         var->grayscale = disp->grayscale;
 876         var->nonstd = disp->nonstd;
 877         var->accel_flags = disp->accel_flags;
 878         var->height = disp->height;
 879         var->width = disp->width;
 880         var->red = disp->red;
 881         var->green = disp->green;
 882         var->blue = disp->blue;
 883         var->transp = disp->transp;
 884         var->rotate = disp->rotate;
 885 }
 886
 887 static const char *fbcon_startup(void)
 888 {
 889         const char *display_desc = "frame buffer device";
 890         struct display *p = &fb_display[fg_console];
 891         struct vc_data *vc = vc_cons[fg_console].d;
 892         const struct font_desc *font = NULL;
 893         struct module *owner;
 894         struct fb_info *info = NULL;
 895         struct fbcon_ops *ops;
 896         int rows, cols;
 897         int irqres;
 898
 899         irqres = 1;
 900         /*
 901          *  If num_registered_fb is zero, this is a call for the dummy part.
 902          *  The frame buffer devices weren't initialized yet.
 903          */
 904         if (!num_registered_fb || info_idx == -1)
 905                 return display_desc;
 906         /*
 907          * Instead of blindly using registered_fb[0], we use info_idx, set by
 908          * fb_console_init();
 909          */
 910         info = registered_fb[info_idx];
 911         if (!info)
 912                 return NULL;
 913
 914         owner = info->fbops->owner;
 915         if (!try_module_get(owner))
 916                 return NULL;
 917         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 918                 module_put(owner);
 919                 return NULL;
 920         }
 921
 922         ops = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 923         if (!ops) {
 924                 module_put(owner);
 925                 return NULL;
 926         }
 927
 928         memset(ops, 0, sizeof(struct fbcon_ops));
 929         ops->currcon = -1;
 930         ops->graphics = 1;
 931         ops->cur_rotate = -1;
 932         info->fbcon_par = ops;
 933         p->con_rotate = rotate;
 934         set_blitting_type(vc, info);
 935
 936         if (info->fix.type != FB_TYPE_TEXT) {
 937                 if (fbcon_softback_size) {
 938                         if (!softback_buf) {
 939                                 softback_buf =
 940                                     (unsigned long)
 941                                     kmalloc(fbcon_softback_size,
 942                                             GFP_KERNEL);
 943                                 if (!softback_buf) {
 944                                         fbcon_softback_size = 0;
 945                                         softback_top = 0;
 946                                 }
 947                         }
 948                 } else {
 949                         if (softback_buf) {
 950                                 kfree((void *) softback_buf);
 951                                 softback_buf = 0;
 952                                 softback_top = 0;
 953                         }
 954                 }
 955                 if (softback_buf)
 956                         softback_in = softback_top = softback_curr =
 957                             softback_buf;
 958                 softback_lines = 0;
 959         }
 960
 961         /* Setup default font */
 962         if (!p->fontdata) {
 963                 if (!fontname[0] || !(font = find_font(fontname)))
 964                         font = get_default_font(info->var.xres,
 965                                                 info->var.yres);
 966                 vc->vc_font.width = font->width;
 967                 vc->vc_font.height = font->height;
 968                 vc->vc_font.data = (void *)(p->fontdata = font->data);
 969                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
 970         }
 971
 972         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
 973         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
 974         cols /= vc->vc_font.width;
 975         rows /= vc->vc_font.height;
 976         vc_resize(vc, cols, rows);
 977
 978         DPRINTK("mode:   %s\n", info->fix.id);
 979         DPRINTK("visual: %d\n", info->fix.visual);
 980         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
 981                 info->var.yres,
 982                 info->var.bits_per_pixel);
 983
 984 #ifdef CONFIG_ATARI
 985         if (MACH_IS_ATARI) {
 986                 cursor_blink_rate = ATARI_CURSOR_BLINK_RATE;
 987                 irqres =
 988                     request_irq(IRQ_AUTO_4, fb_vbl_handler,
 989                                 IRQ_TYPE_PRIO, "framebuffer vbl",
 990                                 info);
 991         }
 992 #endif                          /* CONFIG_ATARI */
 993
 994 #ifdef CONFIG_MAC
 995         /*
 996          * On a Macintoy, the VBL interrupt may or may not be active.
 997          * As interrupt based cursor is more reliable and race free, we
 998          * probe for VBL interrupts.
 999          */
1000         if (MACH_IS_MAC) {
1001                 int ct = 0;
1002                 /*
1003                  * Probe for VBL: set temp. handler ...
1004                  */
1005                 irqres = request_irq(IRQ_MAC_VBL, fb_vbl_detect, 0,
1006                                      "framebuffer vbl", info);
1007                 vbl_detected = 0;
1008
1009                 /*
1010                  * ... and spin for 20 ms ...
1011                  */
1012                 while (!vbl_detected && ++ct < 1000)
1013                         udelay(20);
1014
1015                 if (ct == 1000)
1016                         printk
1017                             ("fbcon_startup: No VBL detected, using timer based cursor.\n");
1018
1019                 free_irq(IRQ_MAC_VBL, fb_vbl_detect);
1020
1021                 if (vbl_detected) {
1022                         /*
1023                          * interrupt based cursor ok
1024                          */
1025                         cursor_blink_rate = MAC_CURSOR_BLINK_RATE;
1026                         irqres =
1027                             request_irq(IRQ_MAC_VBL, fb_vbl_handler, 0,
1028                                         "framebuffer vbl", info);
1029                 } else {
1030                         /*
1031                          * VBL not detected: fall through, use timer based cursor
1032                          */
1033                         irqres = 1;
1034                 }
1035         }
1036 #endif                          /* CONFIG_MAC */
1037
1038         fbcon_add_cursor_timer(info);
1039         return display_desc;
1040 }
1041
1042 static void fbcon_init(struct vc_data *vc, int init)
1043 {
1044         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1045         struct fbcon_ops *ops;
1046         struct vc_data **default_mode = vc->vc_display_fg;
1047         struct vc_data *svc = *default_mode;
1048         struct display *t, *p = &fb_display[vc->vc_num];
1049         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1050         int cap;
1051
1052         if (info_idx == -1 || info == NULL)
1053             return;
1054
1055         cap = info->flags;
1056
1057         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1058             (info->fix.type == FB_TYPE_TEXT))
1059                 logo = 0;
1060
1061         if (var_to_display(p, &info->var, info))
1062                 return;
1063
1064         /* If we are not the first console on this
1065            fb, copy the font from that console */
1066         t = &fb_display[svc->vc_num];
1067         if (!vc->vc_font.data) {
1068                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1069                 vc->vc_font.width = (*default_mode)->vc_font.width;
1070                 vc->vc_font.height = (*default_mode)->vc_font.height;
1071                 p->userfont = t->userfont;
1072                 if (p->userfont)
1073                         REFCOUNT(p->fontdata)++;
1074         }
1075         if (p->userfont)
1076                 charcnt = FNTCHARCNT(p->fontdata);
1077         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1078         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1079         if (charcnt == 256) {
1080                 vc->vc_hi_font_mask = 0;
1081         } else {
1082                 vc->vc_hi_font_mask = 0x100;
1083                 if (vc->vc_can_do_color)
1084                         vc->vc_complement_mask <<= 1;
1085         }
1086
1087         if (!*svc->vc_uni_pagedir_loc)
1088                 con_set_default_unimap(svc);
1089         if (!*vc->vc_uni_pagedir_loc)
1090                 con_copy_unimap(vc, svc);
1091
1092         ops = info->fbcon_par;
1093         p->con_rotate = rotate;
1094         set_blitting_type(vc, info);
1095
1096         cols = vc->vc_cols;
1097         rows = vc->vc_rows;
1098         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1099         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1100         new_cols /= vc->vc_font.width;
1101         new_rows /= vc->vc_font.height;
1102         vc_resize(vc, new_cols, new_rows);
1103
1104         /*
1105          * We must always set the mode. The mode of the previous console
1106          * driver could be in the same resolution but we are using different
1107          * hardware so we have to initialize the hardware.
1108          *
1109          * We need to do it in fbcon_init() to prevent screen corruption.
1110          */
1111         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
1112                 if (info->fbops->fb_set_par &&
1113                     !(ops->flags & FBCON_FLAGS_INIT))
1114                         info->fbops->fb_set_par(info);
1115                 ops->flags |= FBCON_FLAGS_INIT;
1116         }
1117
1118         ops->graphics = 0;
1119
1120         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1121             !(cap & FBINFO_HWACCEL_DISABLED))
1122                 p->scrollmode = SCROLL_MOVE;
1123         else /* default to something safe */
1124                 p->scrollmode = SCROLL_REDRAW;
1125
1126         /*
1127          *  ++guenther: console.c:vc_allocate() relies on initializing
1128          *  vc_{cols,rows}, but we must not set those if we are only
1129          *  resizing the console.
1130          */
1131         if (!init) {
1132                 vc->vc_cols = new_cols;
1133                 vc->vc_rows = new_rows;
1134         }
1135
1136         if (logo)
1137                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1138
1139         if (vc == svc && softback_buf)
1140                 fbcon_update_softback(vc);
1141
1142         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1143                 ops->rotate = FB_ROTATE_UR;
1144                 set_blitting_type(vc, info);
1145         }
1146
1147 }
1148
1149 static void fbcon_deinit(struct vc_data *vc)
1150 {
1151         struct display *p = &fb_display[vc->vc_num];
1152
1153         if (info_idx != -1)
1154             return;
1155         fbcon_free_font(p);
1156 }
1157
1158 /* ====================================================================== */
1159
1160 /*  fbcon_XXX routines - interface used by the world
1161  *
1162  *  This system is now divided into two levels because of complications
1163  *  caused by hardware scrolling. Top level functions:
1164  *
1165  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1166  *
1167  *  handles y values in range [0, scr_height-1] that correspond to real
1168  *  screen positions. y_wrap shift means that first line of bitmap may be
1169  *  anywhere on this display. These functions convert lineoffsets to
1170  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1171  *
1172  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1173  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1174  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1175  *
1176  *  WARNING:
1177  *
1178  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1179  *  Implies should only really hardware scroll in rows. Only reason for
1180  *  restriction is simplicity & efficiency at the moment.
1181  */
1182
1183 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1184                         int width)
1185 {
1186         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1187         struct fbcon_ops *ops = info->fbcon_par;
1188
1189         struct display *p = &fb_display[vc->vc_num];
1190         u_int y_break;
1191
1192         if (fbcon_is_inactive(vc, info))
1193                 return;
1194
1195         if (!height || !width)
1196                 return;
1197
1198         /* Split blits that cross physical y_wrap boundary */
1199
1200         y_break = p->vrows - p->yscroll;
1201         if (sy < y_break && sy + height - 1 >= y_break) {
1202                 u_int b = y_break - sy;
1203                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1204                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1205                                  width);
1206         } else
1207                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1208 }
1209
1210 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1211                         int count, int ypos, int xpos)
1212 {
1213         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1214         struct display *p = &fb_display[vc->vc_num];
1215         struct fbcon_ops *ops = info->fbcon_par;
1216
1217         if (!fbcon_is_inactive(vc, info))
1218                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1219                            get_color(vc, info, scr_readw(s), 1),
1220                            get_color(vc, info, scr_readw(s), 0));
1221 }
1222
1223 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1224 {
1225         unsigned short chr;
1226
1227         scr_writew(c, &chr);
1228         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1229 }
1230
1231 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1232 {
1233         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1234         struct fbcon_ops *ops = info->fbcon_par;
1235
1236         if (!fbcon_is_inactive(vc, info))
1237                 ops->clear_margins(vc, info, bottom_only);
1238 }
1239
1240 static void fbcon_cursor(struct vc_data *vc, int mode)
1241 {
1242         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1243         struct fbcon_ops *ops = info->fbcon_par;
1244         int y;
1245         int c = scr_readw((u16 *) vc->vc_pos);
1246
1247         if (fbcon_is_inactive(vc, info))
1248                 return;
1249
1250         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1251         if (mode & CM_SOFTBACK) {
1252                 mode &= ~CM_SOFTBACK;
1253                 y = softback_lines;
1254         } else {
1255                 if (softback_lines)
1256                         fbcon_set_origin(vc);
1257                 y = 0;
1258         }
1259
1260         ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
1261                     get_color(vc, info, c, 0));
1262         vbl_cursor_cnt = CURSOR_DRAW_DELAY;
1263 }
1264
1265 static int scrollback_phys_max = 0;
1266 static int scrollback_max = 0;
1267 static int scrollback_current = 0;
1268
1269 /*
1270  * If no vc is existent yet, just set struct display
1271  */
1272 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1273                               int unit)
1274 {
1275         struct display *p = &fb_display[unit];
1276         struct display *t = &fb_display[fg_console];
1277
1278         if (var_to_display(p, var, info))
1279                 return;
1280
1281         p->fontdata = t->fontdata;
1282         p->userfont = t->userfont;
1283         if (p->userfont)
1284                 REFCOUNT(p->fontdata)++;
1285 }
1286
1287 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1288                            struct vc_data *vc)
1289 {
1290         struct display *p = &fb_display[vc->vc_num], *t;
1291         struct vc_data **default_mode = vc->vc_display_fg;
1292         struct vc_data *svc = *default_mode;
1293         struct fbcon_ops *ops = info->fbcon_par;
1294         int rows, cols, charcnt = 256;
1295
1296         if (var_to_display(p, var, info))
1297                 return;
1298         t = &fb_display[svc->vc_num];
1299         if (!vc->vc_font.data) {
1300                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1301                 vc->vc_font.width = (*default_mode)->vc_font.width;
1302                 vc->vc_font.height = (*default_mode)->vc_font.height;
1303                 p->userfont = t->userfont;
1304                 if (p->userfont)
1305                         REFCOUNT(p->fontdata)++;
1306         }
1307         if (p->userfont)
1308                 charcnt = FNTCHARCNT(p->fontdata);
1309
1310         var->activate = FB_ACTIVATE_NOW;
1311         info->var.activate = var->activate;
1312         var->yoffset = info->var.yoffset;
1313         var->xoffset = info->var.xoffset;
1314         fb_set_var(info, var);
1315         ops->var = info->var;
1316         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1317         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1318         if (charcnt == 256) {
1319                 vc->vc_hi_font_mask = 0;
1320         } else {
1321                 vc->vc_hi_font_mask = 0x100;
1322                 if (vc->vc_can_do_color)
1323                         vc->vc_complement_mask <<= 1;
1324         }
1325
1326         if (!*svc->vc_uni_pagedir_loc)
1327                 con_set_default_unimap(svc);
1328         if (!*vc->vc_uni_pagedir_loc)
1329                 con_copy_unimap(vc, svc);
1330
1331         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1332         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1333         cols /= vc->vc_font.width;
1334         rows /= vc->vc_font.height;
1335         vc_resize(vc, cols, rows);
1336
1337         if (CON_IS_VISIBLE(vc)) {
1338                 update_screen(vc);
1339                 if (softback_buf)
1340                         fbcon_update_softback(vc);
1341         }
1342 }
1343
1344 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1345 {
1346         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1347         struct fbcon_ops *ops = info->fbcon_par;
1348         struct display *p = &fb_display[vc->vc_num];
1349
1350         p->yscroll += count;
1351         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1352                 p->yscroll -= p->vrows;
1353         ops->var.xoffset = 0;
1354         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1355         ops->var.vmode |= FB_VMODE_YWRAP;
1356         ops->update_start(info);
1357         scrollback_max += count;
1358         if (scrollback_max > scrollback_phys_max)
1359                 scrollback_max = scrollback_phys_max;
1360         scrollback_current = 0;
1361 }
1362
1363 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1364 {
1365         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1366         struct fbcon_ops *ops = info->fbcon_par;
1367         struct display *p = &fb_display[vc->vc_num];
1368
1369         p->yscroll -= count;
1370         if (p->yscroll < 0)     /* Deal with wrap */
1371                 p->yscroll += p->vrows;
1372         ops->var.xoffset = 0;
1373         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1374         ops->var.vmode |= FB_VMODE_YWRAP;
1375         ops->update_start(info);
1376         scrollback_max -= count;
1377         if (scrollback_max < 0)
1378                 scrollback_max = 0;
1379         scrollback_current = 0;
1380 }
1381
1382 static __inline__ void ypan_up(struct vc_data *vc, int count)
1383 {
1384         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1385         struct display *p = &fb_display[vc->vc_num];
1386         struct fbcon_ops *ops = info->fbcon_par;
1387
1388         p->yscroll += count;
1389         if (p->yscroll > p->vrows - vc->vc_rows) {
1390                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1391                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1392                 p->yscroll -= p->vrows - vc->vc_rows;
1393         }
1394
1395         ops->var.xoffset = 0;
1396         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1397         ops->var.vmode &= ~FB_VMODE_YWRAP;
1398         ops->update_start(info);
1399         fbcon_clear_margins(vc, 1);
1400         scrollback_max += count;
1401         if (scrollback_max > scrollback_phys_max)
1402                 scrollback_max = scrollback_phys_max;
1403         scrollback_current = 0;
1404 }
1405
1406 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1407 {
1408         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1409         struct fbcon_ops *ops = info->fbcon_par;
1410         struct display *p = &fb_display[vc->vc_num];
1411         int redraw = 0;
1412
1413         p->yscroll += count;
1414         if (p->yscroll > p->vrows - vc->vc_rows) {
1415                 p->yscroll -= p->vrows - vc->vc_rows;
1416                 redraw = 1;
1417         }
1418
1419         if (redraw)
1420                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1421
1422         ops->var.xoffset = 0;
1423         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1424         ops->var.vmode &= ~FB_VMODE_YWRAP;
1425         ops->update_start(info);
1426         fbcon_clear_margins(vc, 1);
1427         scrollback_max += count;
1428         if (scrollback_max > scrollback_phys_max)
1429                 scrollback_max = scrollback_phys_max;
1430         scrollback_current = 0;
1431 }
1432
1433 static __inline__ void ypan_down(struct vc_data *vc, int count)
1434 {
1435         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1436         struct display *p = &fb_display[vc->vc_num];
1437         struct fbcon_ops *ops = info->fbcon_par;
1438
1439         p->yscroll -= count;
1440         if (p->yscroll < 0) {
1441                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1442                             0, vc->vc_rows, vc->vc_cols);
1443                 p->yscroll += p->vrows - vc->vc_rows;
1444         }
1445
1446         ops->var.xoffset = 0;
1447         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1448         ops->var.vmode &= ~FB_VMODE_YWRAP;
1449         ops->update_start(info);
1450         fbcon_clear_margins(vc, 1);
1451         scrollback_max -= count;
1452         if (scrollback_max < 0)
1453                 scrollback_max = 0;
1454         scrollback_current = 0;
1455 }
1456
1457 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1458 {
1459         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1460         struct fbcon_ops *ops = info->fbcon_par;
1461         struct display *p = &fb_display[vc->vc_num];
1462         int redraw = 0;
1463
1464         p->yscroll -= count;
1465         if (p->yscroll < 0) {
1466                 p->yscroll += p->vrows - vc->vc_rows;
1467                 redraw = 1;
1468         }
1469
1470         if (redraw)
1471                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1472
1473         ops->var.xoffset = 0;
1474         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1475         ops->var.vmode &= ~FB_VMODE_YWRAP;
1476         ops->update_start(info);
1477         fbcon_clear_margins(vc, 1);
1478         scrollback_max -= count;
1479         if (scrollback_max < 0)
1480                 scrollback_max = 0;
1481         scrollback_current = 0;
1482 }
1483
1484 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1485                                   long delta)
1486 {
1487         int count = vc->vc_rows;
1488         unsigned short *d, *s;
1489         unsigned long n;
1490         int line = 0;
1491
1492         d = (u16 *) softback_curr;
1493         if (d == (u16 *) softback_in)
1494                 d = (u16 *) vc->vc_origin;
1495         n = softback_curr + delta * vc->vc_size_row;
1496         softback_lines -= delta;
1497         if (delta < 0) {
1498                 if (softback_curr < softback_top && n < softback_buf) {
1499                         n += softback_end - softback_buf;
1500                         if (n < softback_top) {
1501                                 softback_lines -=
1502                                     (softback_top - n) / vc->vc_size_row;
1503                                 n = softback_top;
1504                         }
1505                 } else if (softback_curr >= softback_top
1506                            && n < softback_top) {
1507                         softback_lines -=
1508                             (softback_top - n) / vc->vc_size_row;
1509                         n = softback_top;
1510                 }
1511         } else {
1512                 if (softback_curr > softback_in && n >= softback_end) {
1513                         n += softback_buf - softback_end;
1514                         if (n > softback_in) {
1515                                 n = softback_in;
1516                                 softback_lines = 0;
1517                         }
1518                 } else if (softback_curr <= softback_in && n > softback_in) {
1519                         n = softback_in;
1520                         softback_lines = 0;
1521                 }
1522         }
1523         if (n == softback_curr)
1524                 return;
1525         softback_curr = n;
1526         s = (u16 *) softback_curr;
1527         if (s == (u16 *) softback_in)
1528                 s = (u16 *) vc->vc_origin;
1529         while (count--) {
1530                 unsigned short *start;
1531                 unsigned short *le;
1532                 unsigned short c;
1533                 int x = 0;
1534                 unsigned short attr = 1;
1535
1536                 start = s;
1537                 le = advance_row(s, 1);
1538                 do {
1539                         c = scr_readw(s);
1540                         if (attr != (c & 0xff00)) {
1541                                 attr = c & 0xff00;
1542                                 if (s > start) {
1543                                         fbcon_putcs(vc, start, s - start,
1544                                                     line, x);
1545                                         x += s - start;
1546                                         start = s;
1547                                 }
1548                         }
1549                         if (c == scr_readw(d)) {
1550                                 if (s > start) {
1551                                         fbcon_putcs(vc, start, s - start,
1552                                                     line, x);
1553                                         x += s - start + 1;
1554                                         start = s + 1;
1555                                 } else {
1556                                         x++;
1557                                         start++;
1558                                 }
1559                         }
1560                         s++;
1561                         d++;
1562                 } while (s < le);
1563                 if (s > start)
1564                         fbcon_putcs(vc, start, s - start, line, x);
1565                 line++;
1566                 if (d == (u16 *) softback_end)
1567                         d = (u16 *) softback_buf;
1568                 if (d == (u16 *) softback_in)
1569                         d = (u16 *) vc->vc_origin;
1570                 if (s == (u16 *) softback_end)
1571                         s = (u16 *) softback_buf;
1572                 if (s == (u16 *) softback_in)
1573                         s = (u16 *) vc->vc_origin;
1574         }
1575 }
1576
1577 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1578                               int line, int count, int dy)
1579 {
1580         unsigned short *s = (unsigned short *)
1581                 (vc->vc_origin + vc->vc_size_row * line);
1582
1583         while (count--) {
1584                 unsigned short *start = s;
1585                 unsigned short *le = advance_row(s, 1);
1586                 unsigned short c;
1587                 int x = 0;
1588                 unsigned short attr = 1;
1589
1590                 do {
1591                         c = scr_readw(s);
1592                         if (attr != (c & 0xff00)) {
1593                                 attr = c & 0xff00;
1594                                 if (s > start) {
1595                                         fbcon_putcs(vc, start, s - start,
1596                                                     dy, x);
1597                                         x += s - start;
1598                                         start = s;
1599                                 }
1600                         }
1601                         console_conditional_schedule();
1602                         s++;
1603                 } while (s < le);
1604                 if (s > start)
1605                         fbcon_putcs(vc, start, s - start, dy, x);
1606                 console_conditional_schedule();
1607                 dy++;
1608         }
1609 }
1610
1611 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1612                          int line, int count, int offset)
1613 {
1614         unsigned short *d = (unsigned short *)
1615             (vc->vc_origin + vc->vc_size_row * line);
1616         unsigned short *s = d + offset;
1617
1618         while (count--) {
1619                 unsigned short *start = s;
1620                 unsigned short *le = advance_row(s, 1);
1621                 unsigned short c;
1622                 int x = 0;
1623                 unsigned short attr = 1;
1624
1625                 do {
1626                         c = scr_readw(s);
1627                         if (attr != (c & 0xff00)) {
1628                                 attr = c & 0xff00;
1629                                 if (s > start) {
1630                                         fbcon_putcs(vc, start, s - start,
1631                                                     line, x);
1632                                         x += s - start;
1633                                         start = s;
1634                                 }
1635                         }
1636                         if (c == scr_readw(d)) {
1637                                 if (s > start) {
1638                                         fbcon_putcs(vc, start, s - start,
1639                                                      line, x);
1640                                         x += s - start + 1;
1641                                         start = s + 1;
1642                                 } else {
1643                                         x++;
1644                                         start++;
1645                                 }
1646                         }
1647                         scr_writew(c, d);
1648                         console_conditional_schedule();
1649                         s++;
1650                         d++;
1651                 } while (s < le);
1652                 if (s > start)
1653                         fbcon_putcs(vc, start, s - start, line, x);
1654                 console_conditional_schedule();
1655                 if (offset > 0)
1656                         line++;
1657                 else {
1658                         line--;
1659                         /* NOTE: We subtract two lines from these pointers */
1660                         s -= vc->vc_size_row;
1661                         d -= vc->vc_size_row;
1662                 }
1663         }
1664 }
1665
1666 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1667                                        int count)
1668 {
1669         unsigned short *p;
1670
1671         if (vc->vc_num != fg_console)
1672                 return;
1673         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1674
1675         while (count) {
1676                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1677                 count--;
1678                 p = advance_row(p, 1);
1679                 softback_in += vc->vc_size_row;
1680                 if (softback_in == softback_end)
1681                         softback_in = softback_buf;
1682                 if (softback_in == softback_top) {
1683                         softback_top += vc->vc_size_row;
1684                         if (softback_top == softback_end)
1685                                 softback_top = softback_buf;
1686                 }
1687         }
1688         softback_curr = softback_in;
1689 }
1690
1691 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1692                         int count)
1693 {
1694         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1695         struct display *p = &fb_display[vc->vc_num];
1696         struct fbcon_ops *ops = info->fbcon_par;
1697         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1698
1699         if (fbcon_is_inactive(vc, info))
1700                 return -EINVAL;
1701
1702         fbcon_cursor(vc, CM_ERASE);
1703
1704         /*
1705          * ++Geert: Only use ywrap/ypan if the console is in text mode
1706          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1707          *           whole screen (prevents flicker).
1708          */
1709
1710         switch (dir) {
1711         case SM_UP:
1712                 if (count > vc->vc_rows)        /* Maximum realistic size */
1713                         count = vc->vc_rows;
1714                 if (softback_top)
1715                         fbcon_softback_note(vc, t, count);
1716                 if (logo_shown >= 0)
1717                         goto redraw_up;
1718                 switch (p->scrollmode) {
1719                 case SCROLL_MOVE:
1720                         ops->bmove(vc, info, t + count, 0, t, 0,
1721                                     b - t - count, vc->vc_cols);
1722                         ops->clear(vc, info, b - count, 0, count,
1723                                   vc->vc_cols);
1724                         break;
1725
1726                 case SCROLL_WRAP_MOVE:
1727                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1728                                 if (t > 0)
1729                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1730                                                     vc->vc_cols);
1731                                 ywrap_up(vc, count);
1732                                 if (vc->vc_rows - b > 0)
1733                                         fbcon_bmove(vc, b - count, 0, b, 0,
1734                                                     vc->vc_rows - b,
1735                                                     vc->vc_cols);
1736                         } else if (info->flags & FBINFO_READS_FAST)
1737                                 fbcon_bmove(vc, t + count, 0, t, 0,
1738                                             b - t - count, vc->vc_cols);
1739                         else
1740                                 goto redraw_up;
1741                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1742                         break;
1743
1744                 case SCROLL_PAN_REDRAW:
1745                         if ((p->yscroll + count <=
1746                              2 * (p->vrows - vc->vc_rows))
1747                             && ((!scroll_partial && (b - t == vc->vc_rows))
1748                                 || (scroll_partial
1749                                     && (b - t - count >
1750                                         3 * vc->vc_rows >> 2)))) {
1751                                 if (t > 0)
1752                                         fbcon_redraw_move(vc, p, 0, t, count);
1753                                 ypan_up_redraw(vc, t, count);
1754                                 if (vc->vc_rows - b > 0)
1755                                         fbcon_redraw_move(vc, p, b - count,
1756                                                           vc->vc_rows - b, b);
1757                         } else
1758                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1759                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1760                         break;
1761
1762                 case SCROLL_PAN_MOVE:
1763                         if ((p->yscroll + count <=
1764                              2 * (p->vrows - vc->vc_rows))
1765                             && ((!scroll_partial && (b - t == vc->vc_rows))
1766                                 || (scroll_partial
1767                                     && (b - t - count >
1768                                         3 * vc->vc_rows >> 2)))) {
1769                                 if (t > 0)
1770                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1771                                                     vc->vc_cols);
1772                                 ypan_up(vc, count);
1773                                 if (vc->vc_rows - b > 0)
1774                                         fbcon_bmove(vc, b - count, 0, b, 0,
1775                                                     vc->vc_rows - b,
1776                                                     vc->vc_cols);
1777                         } else if (info->flags & FBINFO_READS_FAST)
1778                                 fbcon_bmove(vc, t + count, 0, t, 0,
1779                                             b - t - count, vc->vc_cols);
1780                         else
1781                                 goto redraw_up;
1782                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1783                         break;
1784
1785                 case SCROLL_REDRAW:
1786                       redraw_up:
1787                         fbcon_redraw(vc, p, t, b - t - count,
1788                                      count * vc->vc_cols);
1789                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1790                         scr_memsetw((unsigned short *) (vc->vc_origin +
1791                                                         vc->vc_size_row *
1792                                                         (b - count)),
1793                                     vc->vc_video_erase_char,
1794                                     vc->vc_size_row * count);
1795                         return 1;
1796                 }
1797                 break;
1798
1799         case SM_DOWN:
1800                 if (count > vc->vc_rows)        /* Maximum realistic size */
1801                         count = vc->vc_rows;
1802                 if (logo_shown >= 0)
1803                         goto redraw_down;
1804                 switch (p->scrollmode) {
1805                 case SCROLL_MOVE:
1806                         ops->bmove(vc, info, t, 0, t + count, 0,
1807                                     b - t - count, vc->vc_cols);
1808                         ops->clear(vc, info, t, 0, count, vc->vc_cols);
1809                         break;
1810
1811                 case SCROLL_WRAP_MOVE:
1812                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1813                                 if (vc->vc_rows - b > 0)
1814                                         fbcon_bmove(vc, b, 0, b - count, 0,
1815                                                     vc->vc_rows - b,
1816                                                     vc->vc_cols);
1817                                 ywrap_down(vc, count);
1818                                 if (t > 0)
1819                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1820                                                     vc->vc_cols);
1821                         } else if (info->flags & FBINFO_READS_FAST)
1822                                 fbcon_bmove(vc, t, 0, t + count, 0,
1823                                             b - t - count, vc->vc_cols);
1824                         else
1825                                 goto redraw_down;
1826                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1827                         break;
1828
1829                 case SCROLL_PAN_MOVE:
1830                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1831                             && ((!scroll_partial && (b - t == vc->vc_rows))
1832                                 || (scroll_partial
1833                                     && (b - t - count >
1834                                         3 * vc->vc_rows >> 2)))) {
1835                                 if (vc->vc_rows - b > 0)
1836                                         fbcon_bmove(vc, b, 0, b - count, 0,
1837                                                     vc->vc_rows - b,
1838                                                     vc->vc_cols);
1839                                 ypan_down(vc, count);
1840                                 if (t > 0)
1841                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1842                                                     vc->vc_cols);
1843                         } else if (info->flags & FBINFO_READS_FAST)
1844                                 fbcon_bmove(vc, t, 0, t + count, 0,
1845                                             b - t - count, vc->vc_cols);
1846                         else
1847                                 goto redraw_down;
1848                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1849                         break;
1850
1851                 case SCROLL_PAN_REDRAW:
1852                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1853                             && ((!scroll_partial && (b - t == vc->vc_rows))
1854                                 || (scroll_partial
1855                                     && (b - t - count >
1856                                         3 * vc->vc_rows >> 2)))) {
1857                                 if (vc->vc_rows - b > 0)
1858                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1859                                                           b - count);
1860                                 ypan_down_redraw(vc, t, count);
1861                                 if (t > 0)
1862                                         fbcon_redraw_move(vc, p, count, t, 0);
1863                         } else
1864                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1865                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1866                         break;
1867
1868                 case SCROLL_REDRAW:
1869                       redraw_down:
1870                         fbcon_redraw(vc, p, b - 1, b - t - count,
1871                                      -count * vc->vc_cols);
1872                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1873                         scr_memsetw((unsigned short *) (vc->vc_origin +
1874                                                         vc->vc_size_row *
1875                                                         t),
1876                                     vc->vc_video_erase_char,
1877                                     vc->vc_size_row * count);
1878                         return 1;
1879                 }
1880         }
1881         return 0;
1882 }
1883
1884
1885 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1886                         int height, int width)
1887 {
1888         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1889         struct display *p = &fb_display[vc->vc_num];
1890
1891         if (fbcon_is_inactive(vc, info))
1892                 return;
1893
1894         if (!width || !height)
1895                 return;
1896
1897         /*  Split blits that cross physical y_wrap case.
1898          *  Pathological case involves 4 blits, better to use recursive
1899          *  code rather than unrolled case
1900          *
1901          *  Recursive invocations don't need to erase the cursor over and
1902          *  over again, so we use fbcon_bmove_rec()
1903          */
1904         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1905                         p->vrows - p->yscroll);
1906 }
1907
1908 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
1909                             int dy, int dx, int height, int width, u_int y_break)
1910 {
1911         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1912         struct fbcon_ops *ops = info->fbcon_par;
1913         u_int b;
1914
1915         if (sy < y_break && sy + height > y_break) {
1916                 b = y_break - sy;
1917                 if (dy < sy) {  /* Avoid trashing self */
1918                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1919                                         y_break);
1920                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1921                                         height - b, width, y_break);
1922                 } else {
1923                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1924                                         height - b, width, y_break);
1925                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1926                                         y_break);
1927                 }
1928                 return;
1929         }
1930
1931         if (dy < y_break && dy + height > y_break) {
1932                 b = y_break - dy;
1933                 if (dy < sy) {  /* Avoid trashing self */
1934                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1935                                         y_break);
1936                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1937                                         height - b, width, y_break);
1938                 } else {
1939                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1940                                         height - b, width, y_break);
1941                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1942                                         y_break);
1943                 }
1944                 return;
1945         }
1946         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1947                    height, width);
1948 }
1949
1950 static __inline__ void updatescrollmode(struct display *p,
1951                                         struct fb_info *info,
1952                                         struct vc_data *vc)
1953 {
1954         struct fbcon_ops *ops = info->fbcon_par;
1955         int fh = vc->vc_font.height;
1956         int cap = info->flags;
1957         u16 t = 0;
1958         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
1959                                   info->fix.xpanstep);
1960         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
1961         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1962         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1963                                    info->var.xres_virtual);
1964         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
1965                 divides(ypan, vc->vc_font.height) && vyres > yres;
1966         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
1967                 divides(ywrap, vc->vc_font.height) &&
1968                 divides(vc->vc_font.height, vyres);
1969         int reading_fast = cap & FBINFO_READS_FAST;
1970         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
1971                 !(cap & FBINFO_HWACCEL_DISABLED);
1972         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
1973                 !(cap & FBINFO_HWACCEL_DISABLED);
1974
1975         p->vrows = vyres/fh;
1976         if (yres > (fh * (vc->vc_rows + 1)))
1977                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
1978         if ((yres % fh) && (vyres % fh < yres % fh))
1979                 p->vrows--;
1980
1981         if (good_wrap || good_pan) {
1982                 if (reading_fast || fast_copyarea)
1983                         p->scrollmode = good_wrap ?
1984                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
1985                 else
1986                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
1987                                 SCROLL_PAN_REDRAW;
1988         } else {
1989                 if (reading_fast || (fast_copyarea && !fast_imageblit))
1990                         p->scrollmode = SCROLL_MOVE;
1991                 else
1992                         p->scrollmode = SCROLL_REDRAW;
1993         }
1994 }
1995
1996 static int fbcon_resize(struct vc_data *vc, unsigned int width,
1997                         unsigned int height)
1998 {
1999         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2000         struct fbcon_ops *ops = info->fbcon_par;
2001         struct display *p = &fb_display[vc->vc_num];
2002         struct fb_var_screeninfo var = info->var;
2003         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2004
2005         virt_w = FBCON_SWAP(ops->rotate, width, height);
2006         virt_h = FBCON_SWAP(ops->rotate, height, width);
2007         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2008                                  vc->vc_font.height);
2009         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2010                                  vc->vc_font.width);
2011         var.xres = virt_w * virt_fw;
2012         var.yres = virt_h * virt_fh;
2013         x_diff = info->var.xres - var.xres;
2014         y_diff = info->var.yres - var.yres;
2015         if (x_diff < 0 || x_diff > virt_fw ||
2016             y_diff < 0 || y_diff > virt_fh) {
2017                 struct fb_videomode *mode;
2018
2019                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2020                 mode = fb_find_best_mode(&var, &info->modelist);
2021                 if (mode == NULL)
2022                         return -EINVAL;
2023                 display_to_var(&var, p);
2024                 fb_videomode_to_var(&var, mode);
2025
2026                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2027                         return -EINVAL;
2028
2029                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2030                 if (CON_IS_VISIBLE(vc)) {
2031                         var.activate = FB_ACTIVATE_NOW |
2032                                 FB_ACTIVATE_FORCE;
2033                         fb_set_var(info, &var);
2034                 }
2035                 var_to_display(p, &info->var, info);
2036                 ops->var = info->var;
2037         }
2038         updatescrollmode(p, info, vc);
2039         return 0;
2040 }
2041
2042 static int fbcon_switch(struct vc_data *vc)
2043 {
2044         struct fb_info *info, *old_info = NULL;
2045         struct fbcon_ops *ops;
2046         struct display *p = &fb_display[vc->vc_num];
2047         struct fb_var_screeninfo var;
2048         int i, prev_console, charcnt = 256;
2049
2050         info = registered_fb[con2fb_map[vc->vc_num]];
2051         ops = info->fbcon_par;
2052
2053         if (softback_top) {
2054                 if (softback_lines)
2055                         fbcon_set_origin(vc);
2056                 softback_top = softback_curr = softback_in = softback_buf;
2057                 softback_lines = 0;
2058                 fbcon_update_softback(vc);
2059         }
2060
2061         if (logo_shown >= 0) {
2062                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2063
2064                 if (conp2->vc_top == logo_lines
2065                     && conp2->vc_bottom == conp2->vc_rows)
2066                         conp2->vc_top = 0;
2067                 logo_shown = FBCON_LOGO_CANSHOW;
2068         }
2069
2070         prev_console = ops->currcon;
2071         if (prev_console != -1)
2072                 old_info = registered_fb[con2fb_map[prev_console]];
2073         /*
2074          * FIXME: If we have multiple fbdev's loaded, we need to
2075          * update all info->currcon.  Perhaps, we can place this
2076          * in a centralized structure, but this might break some
2077          * drivers.
2078          *
2079          * info->currcon = vc->vc_num;
2080          */
2081         for (i = 0; i < FB_MAX; i++) {
2082                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2083                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2084
2085                         o->currcon = vc->vc_num;
2086                 }
2087         }
2088         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2089         display_to_var(&var, p);
2090         var.activate = FB_ACTIVATE_NOW;
2091
2092         /*
2093          * make sure we don't unnecessarily trip the memcmp()
2094          * in fb_set_var()
2095          */
2096         info->var.activate = var.activate;
2097         var.yoffset = info->var.yoffset;
2098         var.xoffset = info->var.xoffset;
2099         var.vmode = info->var.vmode;
2100         fb_set_var(info, &var);
2101         ops->var = info->var;
2102
2103         if (old_info != NULL && (old_info != info ||
2104                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2105                 if (info->fbops->fb_set_par)
2106                         info->fbops->fb_set_par(info);
2107                 fbcon_del_cursor_timer(old_info);
2108                 fbcon_add_cursor_timer(info);
2109         }
2110
2111         set_blitting_type(vc, info);
2112         ops->cursor_reset = 1;
2113
2114         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2115                 ops->rotate = FB_ROTATE_UR;
2116                 set_blitting_type(vc, info);
2117         }
2118
2119         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2120         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2121
2122         if (p->userfont)
2123                 charcnt = FNTCHARCNT(vc->vc_font.data);
2124
2125         if (charcnt > 256)
2126                 vc->vc_complement_mask <<= 1;
2127
2128         updatescrollmode(p, info, vc);
2129
2130         switch (p->scrollmode) {
2131         case SCROLL_WRAP_MOVE:
2132                 scrollback_phys_max = p->vrows - vc->vc_rows;
2133                 break;
2134         case SCROLL_PAN_MOVE:
2135         case SCROLL_PAN_REDRAW:
2136                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2137                 if (scrollback_phys_max < 0)
2138                         scrollback_phys_max = 0;
2139                 break;
2140         default:
2141                 scrollback_phys_max = 0;
2142                 break;
2143         }
2144
2145         scrollback_max = 0;
2146         scrollback_current = 0;
2147
2148         if (!fbcon_is_inactive(vc, info)) {
2149             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2150             ops->update_start(info);
2151         }
2152
2153         fbcon_set_palette(vc, color_table);
2154         fbcon_clear_margins(vc, 0);
2155
2156         if (logo_shown == FBCON_LOGO_DRAW) {
2157
2158                 logo_shown = fg_console;
2159                 /* This is protected above by initmem_freed */
2160                 fb_show_logo(info, ops->rotate);
2161                 update_region(vc,
2162                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2163                               vc->vc_size_row * (vc->vc_bottom -
2164                                                  vc->vc_top) / 2);
2165                 return 0;
2166         }
2167         return 1;
2168 }
2169
2170 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2171                                 int blank)
2172 {
2173         if (blank) {
2174                 unsigned short charmask = vc->vc_hi_font_mask ?
2175                         0x1ff : 0xff;
2176                 unsigned short oldc;
2177
2178                 oldc = vc->vc_video_erase_char;
2179                 vc->vc_video_erase_char &= charmask;
2180                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2181                 vc->vc_video_erase_char = oldc;
2182         }
2183 }
2184
2185 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2186 {
2187         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2188         struct fbcon_ops *ops = info->fbcon_par;
2189
2190         if (mode_switch) {
2191                 struct fb_var_screeninfo var = info->var;
2192
2193                 ops->graphics = 1;
2194
2195                 if (!blank) {
2196                         if (info->fbops->fb_save_state)
2197                                 info->fbops->fb_save_state(info);
2198                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2199                         fb_set_var(info, &var);
2200                         ops->graphics = 0;
2201                         ops->var = info->var;
2202                 } else if (info->fbops->fb_restore_state)
2203                         info->fbops->fb_restore_state(info);
2204         }
2205
2206         if (!fbcon_is_inactive(vc, info)) {
2207                 if (ops->blank_state != blank) {
2208                         ops->blank_state = blank;
2209                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2210                         ops->cursor_flash = (!blank);
2211
2212                         if (fb_blank(info, blank))
2213                                 fbcon_generic_blank(vc, info, blank);
2214                 }
2215
2216                 if (!blank)
2217                         update_screen(vc);
2218         }
2219
2220         if (!blank)
2221                 fbcon_add_cursor_timer(info);
2222         else
2223                 fbcon_del_cursor_timer(info);
2224
2225         return 0;
2226 }
2227
2228 static void fbcon_free_font(struct display *p)
2229 {
2230         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
2231                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
2232         p->fontdata = NULL;
2233         p->userfont = 0;
2234 }
2235
2236 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2237 {
2238         u8 *fontdata = vc->vc_font.data;
2239         u8 *data = font->data;
2240         int i, j;
2241
2242         font->width = vc->vc_font.width;
2243         font->height = vc->vc_font.height;
2244         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2245         if (!font->data)
2246                 return 0;
2247
2248         if (font->width <= 8) {
2249                 j = vc->vc_font.height;
2250                 for (i = 0; i < font->charcount; i++) {
2251                         memcpy(data, fontdata, j);
2252                         memset(data + j, 0, 32 - j);
2253                         data += 32;
2254                         fontdata += j;
2255                 }
2256         } else if (font->width <= 16) {
2257                 j = vc->vc_font.height * 2;
2258                 for (i = 0; i < font->charcount; i++) {
2259                         memcpy(data, fontdata, j);
2260                         memset(data + j, 0, 64 - j);
2261                         data += 64;
2262                         fontdata += j;
2263                 }
2264         } else if (font->width <= 24) {
2265                 for (i = 0; i < font->charcount; i++) {
2266                         for (j = 0; j < vc->vc_font.height; j++) {
2267                                 *data++ = fontdata[0];
2268                                 *data++ = fontdata[1];
2269                                 *data++ = fontdata[2];
2270                                 fontdata += sizeof(u32);
2271                         }
2272                         memset(data, 0, 3 * (32 - j));
2273                         data += 3 * (32 - j);
2274                 }
2275         } else {
2276                 j = vc->vc_font.height * 4;
2277                 for (i = 0; i < font->charcount; i++) {
2278                         memcpy(data, fontdata, j);
2279                         memset(data + j, 0, 128 - j);
2280                         data += 128;
2281                         fontdata += j;
2282                 }
2283         }
2284         return 0;
2285 }
2286
2287 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2288                              const u8 * data, int userfont)
2289 {
2290         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2291         struct fbcon_ops *ops = info->fbcon_par;
2292         struct display *p = &fb_display[vc->vc_num];
2293         int resize;
2294         int cnt;
2295         char *old_data = NULL;
2296
2297         if (CON_IS_VISIBLE(vc) && softback_lines)
2298                 fbcon_set_origin(vc);
2299
2300         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2301         if (p->userfont)
2302                 old_data = vc->vc_font.data;
2303         if (userfont)
2304                 cnt = FNTCHARCNT(data);
2305         else
2306                 cnt = 256;
2307         vc->vc_font.data = (void *)(p->fontdata = data);
2308         if ((p->userfont = userfont))
2309                 REFCOUNT(data)++;
2310         vc->vc_font.width = w;
2311         vc->vc_font.height = h;
2312         if (vc->vc_hi_font_mask && cnt == 256) {
2313                 vc->vc_hi_font_mask = 0;
2314                 if (vc->vc_can_do_color) {
2315                         vc->vc_complement_mask >>= 1;
2316                         vc->vc_s_complement_mask >>= 1;
2317                 }
2318
2319                 /* ++Edmund: reorder the attribute bits */
2320                 if (vc->vc_can_do_color) {
2321                         unsigned short *cp =
2322                             (unsigned short *) vc->vc_origin;
2323                         int count = vc->vc_screenbuf_size / 2;
2324                         unsigned short c;
2325                         for (; count > 0; count--, cp++) {
2326                                 c = scr_readw(cp);
2327                                 scr_writew(((c & 0xfe00) >> 1) |
2328                                            (c & 0xff), cp);
2329                         }
2330                         c = vc->vc_video_erase_char;
2331                         vc->vc_video_erase_char =
2332                             ((c & 0xfe00) >> 1) | (c & 0xff);
2333                         vc->vc_attr >>= 1;
2334                 }
2335         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2336                 vc->vc_hi_font_mask = 0x100;
2337                 if (vc->vc_can_do_color) {
2338                         vc->vc_complement_mask <<= 1;
2339                         vc->vc_s_complement_mask <<= 1;
2340                 }
2341
2342                 /* ++Edmund: reorder the attribute bits */
2343                 {
2344                         unsigned short *cp =
2345                             (unsigned short *) vc->vc_origin;
2346                         int count = vc->vc_screenbuf_size / 2;
2347                         unsigned short c;
2348                         for (; count > 0; count--, cp++) {
2349                                 unsigned short newc;
2350                                 c = scr_readw(cp);
2351                                 if (vc->vc_can_do_color)
2352                                         newc =
2353                                             ((c & 0xff00) << 1) | (c &
2354                                                                    0xff);
2355                                 else
2356                                         newc = c & ~0x100;
2357                                 scr_writew(newc, cp);
2358                         }
2359                         c = vc->vc_video_erase_char;
2360                         if (vc->vc_can_do_color) {
2361                                 vc->vc_video_erase_char =
2362                                     ((c & 0xff00) << 1) | (c & 0xff);
2363                                 vc->vc_attr <<= 1;
2364                         } else
2365                                 vc->vc_video_erase_char = c & ~0x100;
2366                 }
2367
2368         }
2369
2370         if (resize) {
2371                 int cols, rows;
2372
2373                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2374                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2375                 cols /= w;
2376                 rows /= h;
2377                 vc_resize(vc, cols, rows);
2378                 if (CON_IS_VISIBLE(vc) && softback_buf)
2379                         fbcon_update_softback(vc);
2380         } else if (CON_IS_VISIBLE(vc)
2381                    && vc->vc_mode == KD_TEXT) {
2382                 fbcon_clear_margins(vc, 0);
2383                 update_screen(vc);
2384         }
2385
2386         if (old_data && (--REFCOUNT(old_data) == 0))
2387                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2388         return 0;
2389 }
2390
2391 static int fbcon_copy_font(struct vc_data *vc, int con)
2392 {
2393         struct display *od = &fb_display[con];
2394         struct console_font *f = &vc->vc_font;
2395
2396         if (od->fontdata == f->data)
2397                 return 0;       /* already the same font... */
2398         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2399 }
2400
2401 /*
2402  *  User asked to set font; we are guaranteed that
2403  *      a) width and height are in range 1..32
2404  *      b) charcount does not exceed 512
2405  *  but lets not assume that, since someone might someday want to use larger
2406  *  fonts. And charcount of 512 is small for unicode support.
2407  *
2408  *  However, user space gives the font in 32 rows , regardless of
2409  *  actual font height. So a new API is needed if support for larger fonts
2410  *  is ever implemented.
2411  */
2412
2413 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2414 {
2415         unsigned charcount = font->charcount;
2416         int w = font->width;
2417         int h = font->height;
2418         int size;
2419         int i, csum;
2420         u8 *new_data, *data = font->data;
2421         int pitch = (font->width+7) >> 3;
2422
2423         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2424          * If not this check should be changed to charcount < 256 */
2425         if (charcount != 256 && charcount != 512)
2426                 return -EINVAL;
2427
2428         size = h * pitch * charcount;
2429
2430         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2431
2432         if (!new_data)
2433                 return -ENOMEM;
2434
2435         new_data += FONT_EXTRA_WORDS * sizeof(int);
2436         FNTSIZE(new_data) = size;
2437         FNTCHARCNT(new_data) = charcount;
2438         REFCOUNT(new_data) = 0; /* usage counter */
2439         for (i=0; i< charcount; i++) {
2440                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2441         }
2442
2443         /* Since linux has a nice crc32 function use it for counting font
2444          * checksums. */
2445         csum = crc32(0, new_data, size);
2446
2447         FNTSUM(new_data) = csum;
2448         /* Check if the same font is on some other console already */
2449         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2450                 struct vc_data *tmp = vc_cons[i].d;
2451
2452                 if (fb_display[i].userfont &&
2453                     fb_display[i].fontdata &&
2454                     FNTSUM(fb_display[i].fontdata) == csum &&
2455                     FNTSIZE(fb_display[i].fontdata) == size &&
2456                     tmp->vc_font.width == w &&
2457                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2458                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2459                         new_data = (u8 *)fb_display[i].fontdata;
2460                         break;
2461                 }
2462         }
2463         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2464 }
2465
2466 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2467 {
2468         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2469         const struct font_desc *f;
2470
2471         if (!name)
2472                 f = get_default_font(info->var.xres, info->var.yres);
2473         else if (!(f = find_font(name)))
2474                 return -ENOENT;
2475
2476         font->width = f->width;
2477         font->height = f->height;
2478         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2479 }
2480
2481 static u16 palette_red[16];
2482 static u16 palette_green[16];
2483 static u16 palette_blue[16];
2484
2485 static struct fb_cmap palette_cmap = {
2486         0, 16, palette_red, palette_green, palette_blue, NULL
2487 };
2488
2489 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
2490 {
2491         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2492         int i, j, k, depth;
2493         u8 val;
2494
2495         if (fbcon_is_inactive(vc, info))
2496                 return -EINVAL;
2497
2498         if (!CON_IS_VISIBLE(vc))
2499                 return 0;
2500
2501         depth = fb_get_color_depth(&info->var, &info->fix);
2502         if (depth > 3) {
2503                 for (i = j = 0; i < 16; i++) {
2504                         k = table[i];
2505                         val = vc->vc_palette[j++];
2506                         palette_red[k] = (val << 8) | val;
2507                         val = vc->vc_palette[j++];
2508                         palette_green[k] = (val << 8) | val;
2509                         val = vc->vc_palette[j++];
2510                         palette_blue[k] = (val << 8) | val;
2511                 }
2512                 palette_cmap.len = 16;
2513                 palette_cmap.start = 0;
2514         /*
2515          * If framebuffer is capable of less than 16 colors,
2516          * use default palette of fbcon.
2517          */
2518         } else
2519                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2520
2521         return fb_set_cmap(&palette_cmap, info);
2522 }
2523
2524 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2525 {
2526         unsigned long p;
2527         int line;
2528
2529         if (vc->vc_num != fg_console || !softback_lines)
2530                 return (u16 *) (vc->vc_origin + offset);
2531         line = offset / vc->vc_size_row;
2532         if (line >= softback_lines)
2533                 return (u16 *) (vc->vc_origin + offset -
2534                                 softback_lines * vc->vc_size_row);
2535         p = softback_curr + offset;
2536         if (p >= softback_end)
2537                 p += softback_buf - softback_end;
2538         return (u16 *) p;
2539 }
2540
2541 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2542                                  int *px, int *py)
2543 {
2544         unsigned long ret;
2545         int x, y;
2546
2547         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2548                 unsigned long offset = (pos - vc->vc_origin) / 2;
2549
2550                 x = offset % vc->vc_cols;
2551                 y = offset / vc->vc_cols;
2552                 if (vc->vc_num == fg_console)
2553                         y += softback_lines;
2554                 ret = pos + (vc->vc_cols - x) * 2;
2555         } else if (vc->vc_num == fg_console && softback_lines) {
2556                 unsigned long offset = pos - softback_curr;
2557
2558                 if (pos < softback_curr)
2559                         offset += softback_end - softback_buf;
2560                 offset /= 2;
2561                 x = offset % vc->vc_cols;
2562                 y = offset / vc->vc_cols;
2563                 ret = pos + (vc->vc_cols - x) * 2;
2564                 if (ret == softback_end)
2565                         ret = softback_buf;
2566                 if (ret == softback_in)
2567                         ret = vc->vc_origin;
2568         } else {
2569                 /* Should not happen */
2570                 x = y = 0;
2571                 ret = vc->vc_origin;
2572         }
2573         if (px)
2574                 *px = x;
2575         if (py)
2576                 *py = y;
2577         return ret;
2578 }
2579
2580 /* As we might be inside of softback, we may work with non-contiguous buffer,
2581    that's why we have to use a separate routine. */
2582 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2583 {
2584         while (cnt--) {
2585                 u16 a = scr_readw(p);
2586                 if (!vc->vc_can_do_color)
2587                         a ^= 0x0800;
2588                 else if (vc->vc_hi_font_mask == 0x100)
2589                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2590                             (((a) & 0x0e00) << 4);
2591                 else
2592                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2593                             (((a) & 0x0700) << 4);
2594                 scr_writew(a, p++);
2595                 if (p == (u16 *) softback_end)
2596                         p = (u16 *) softback_buf;
2597                 if (p == (u16 *) softback_in)
2598                         p = (u16 *) vc->vc_origin;
2599         }
2600 }
2601
2602 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
2603 {
2604         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2605         struct fbcon_ops *ops = info->fbcon_par;
2606         struct display *p = &fb_display[fg_console];
2607         int offset, limit, scrollback_old;
2608
2609         if (softback_top) {
2610                 if (vc->vc_num != fg_console)
2611                         return 0;
2612                 if (vc->vc_mode != KD_TEXT || !lines)
2613                         return 0;
2614                 if (logo_shown >= 0) {
2615                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2616
2617                         if (conp2->vc_top == logo_lines
2618                             && conp2->vc_bottom == conp2->vc_rows)
2619                                 conp2->vc_top = 0;
2620                         if (logo_shown == vc->vc_num) {
2621                                 unsigned long p, q;
2622                                 int i;
2623
2624                                 p = softback_in;
2625                                 q = vc->vc_origin +
2626                                     logo_lines * vc->vc_size_row;
2627                                 for (i = 0; i < logo_lines; i++) {
2628                                         if (p == softback_top)
2629                                                 break;
2630                                         if (p == softback_buf)
2631                                                 p = softback_end;
2632                                         p -= vc->vc_size_row;
2633                                         q -= vc->vc_size_row;
2634                                         scr_memcpyw((u16 *) q, (u16 *) p,
2635                                                     vc->vc_size_row);
2636                                 }
2637                                 softback_in = p;
2638                                 update_region(vc, vc->vc_origin,
2639                                               logo_lines * vc->vc_cols);
2640                         }
2641                         logo_shown = FBCON_LOGO_CANSHOW;
2642                 }
2643                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2644                 fbcon_redraw_softback(vc, p, lines);
2645                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2646                 return 0;
2647         }
2648
2649         if (!scrollback_phys_max)
2650                 return -ENOSYS;
2651
2652         scrollback_old = scrollback_current;
2653         scrollback_current -= lines;
2654         if (scrollback_current < 0)
2655                 scrollback_current = 0;
2656         else if (scrollback_current > scrollback_max)
2657                 scrollback_current = scrollback_max;
2658         if (scrollback_current == scrollback_old)
2659                 return 0;
2660
2661         if (fbcon_is_inactive(vc, info))
2662                 return 0;
2663
2664         fbcon_cursor(vc, CM_ERASE);
2665
2666         offset = p->yscroll - scrollback_current;
2667         limit = p->vrows;
2668         switch (p->scrollmode) {
2669         case SCROLL_WRAP_MOVE:
2670                 info->var.vmode |= FB_VMODE_YWRAP;
2671                 break;
2672         case SCROLL_PAN_MOVE:
2673         case SCROLL_PAN_REDRAW:
2674                 limit -= vc->vc_rows;
2675                 info->var.vmode &= ~FB_VMODE_YWRAP;
2676                 break;
2677         }
2678         if (offset < 0)
2679                 offset += limit;
2680         else if (offset >= limit)
2681                 offset -= limit;
2682
2683         ops->var.xoffset = 0;
2684         ops->var.yoffset = offset * vc->vc_font.height;
2685         ops->update_start(info);
2686
2687         if (!scrollback_current)
2688                 fbcon_cursor(vc, CM_DRAW);
2689         return 0;
2690 }
2691
2692 static int fbcon_set_origin(struct vc_data *vc)
2693 {
2694         if (softback_lines)
2695                 fbcon_scrolldelta(vc, softback_lines);
2696         return 0;
2697 }
2698
2699 static void fbcon_suspended(struct fb_info *info)
2700 {
2701         struct vc_data *vc = NULL;
2702         struct fbcon_ops *ops = info->fbcon_par;
2703
2704         if (!ops || ops->currcon < 0)
2705                 return;
2706         vc = vc_cons[ops->currcon].d;
2707
2708         /* Clear cursor, restore saved data */
2709         fbcon_cursor(vc, CM_ERASE);
2710 }
2711
2712 static void fbcon_resumed(struct fb_info *info)
2713 {
2714         struct vc_data *vc;
2715         struct fbcon_ops *ops = info->fbcon_par;
2716
2717         if (!ops || ops->currcon < 0)
2718                 return;
2719         vc = vc_cons[ops->currcon].d;
2720
2721         update_screen(vc);
2722 }
2723
2724 static void fbcon_modechanged(struct fb_info *info)
2725 {
2726         struct fbcon_ops *ops = info->fbcon_par;
2727         struct vc_data *vc;
2728         struct display *p;
2729         int rows, cols;
2730
2731         if (!ops || ops->currcon < 0)
2732                 return;
2733         vc = vc_cons[ops->currcon].d;
2734         if (vc->vc_mode != KD_TEXT ||
2735             registered_fb[con2fb_map[ops->currcon]] != info)
2736                 return;
2737
2738         p = &fb_display[vc->vc_num];
2739         set_blitting_type(vc, info);
2740
2741         if (CON_IS_VISIBLE(vc)) {
2742                 var_to_display(p, &info->var, info);
2743                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2744                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2745                 cols /= vc->vc_font.width;
2746                 rows /= vc->vc_font.height;
2747                 vc_resize(vc, cols, rows);
2748                 updatescrollmode(p, info, vc);
2749                 scrollback_max = 0;
2750                 scrollback_current = 0;
2751
2752                 if (!fbcon_is_inactive(vc, info)) {
2753                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2754                     ops->update_start(info);
2755                 }
2756
2757                 fbcon_set_palette(vc, color_table);
2758                 update_screen(vc);
2759                 if (softback_buf)
2760                         fbcon_update_softback(vc);
2761         }
2762 }
2763
2764 static void fbcon_set_all_vcs(struct fb_info *info)
2765 {
2766         struct fbcon_ops *ops = info->fbcon_par;
2767         struct vc_data *vc;
2768         struct display *p;
2769         int i, rows, cols;
2770
2771         if (!ops || ops->currcon < 0)
2772                 return;
2773
2774         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2775                 vc = vc_cons[i].d;
2776                 if (!vc || vc->vc_mode != KD_TEXT ||
2777                     registered_fb[con2fb_map[i]] != info)
2778                         continue;
2779
2780                 p = &fb_display[vc->vc_num];
2781                 set_blitting_type(vc, info);
2782                 var_to_display(p, &info->var, info);
2783                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2784                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2785                 cols /= vc->vc_font.width;
2786                 rows /= vc->vc_font.height;
2787                 vc_resize(vc, cols, rows);
2788
2789                 if (CON_IS_VISIBLE(vc)) {
2790                         updatescrollmode(p, info, vc);
2791                         scrollback_max = 0;
2792                         scrollback_current = 0;
2793
2794                         if (!fbcon_is_inactive(vc, info)) {
2795                             ops->var.xoffset = ops->var.yoffset =
2796                                 p->yscroll = 0;
2797                             ops->update_start(info);
2798                         }
2799
2800                         fbcon_set_palette(vc, color_table);
2801                         update_screen(vc);
2802                         if (softback_buf)
2803                                 fbcon_update_softback(vc);
2804                 }
2805         }
2806 }
2807
2808 static int fbcon_mode_deleted(struct fb_info *info,
2809                               struct fb_videomode *mode)
2810 {
2811         struct fb_info *fb_info;
2812         struct display *p;
2813         int i, j, found = 0;
2814
2815         /* before deletion, ensure that mode is not in use */
2816         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2817                 j = con2fb_map[i];
2818                 if (j == -1)
2819                         continue;
2820                 fb_info = registered_fb[j];
2821                 if (fb_info != info)
2822                         continue;
2823                 p = &fb_display[i];
2824                 if (!p || !p->mode)
2825                         continue;
2826                 if (fb_mode_is_equal(p->mode, mode)) {
2827                         found = 1;
2828                         break;
2829                 }
2830         }
2831         return found;
2832 }
2833
2834 static int fbcon_fb_registered(int idx)
2835 {
2836         int ret = 0, i;
2837
2838         if (info_idx == -1) {
2839                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2840                         if (con2fb_map_boot[i] == idx) {
2841                                 info_idx = idx;
2842                                 break;
2843                         }
2844                 }
2845                 if (info_idx != -1)
2846                         ret = fbcon_takeover(1);
2847         } else {
2848                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2849                         if (con2fb_map_boot[i] == idx)
2850                                 set_con2fb_map(i, idx, 0);
2851                 }
2852         }
2853
2854         return ret;
2855 }
2856
2857 static void fbcon_fb_blanked(struct fb_info *info, int blank)
2858 {
2859         struct fbcon_ops *ops = info->fbcon_par;
2860         struct vc_data *vc;
2861
2862         if (!ops || ops->currcon < 0)
2863                 return;
2864
2865         vc = vc_cons[ops->currcon].d;
2866         if (vc->vc_mode != KD_TEXT ||
2867                         registered_fb[con2fb_map[ops->currcon]] != info)
2868                 return;
2869
2870         if (CON_IS_VISIBLE(vc)) {
2871                 if (blank)
2872                         do_blank_screen(0);
2873                 else
2874                         do_unblank_screen(0);
2875         }
2876         ops->blank_state = blank;
2877 }
2878
2879 static void fbcon_new_modelist(struct fb_info *info)
2880 {
2881         int i;
2882         struct vc_data *vc;
2883         struct fb_var_screeninfo var;
2884         struct fb_videomode *mode;
2885
2886         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2887                 if (registered_fb[con2fb_map[i]] != info)
2888                         continue;
2889                 if (!fb_display[i].mode)
2890                         continue;
2891                 vc = vc_cons[i].d;
2892                 display_to_var(&var, &fb_display[i]);
2893                 mode = fb_find_nearest_mode(fb_display[i].mode,
2894                                             &info->modelist);
2895                 fb_videomode_to_var(&var, mode);
2896
2897                 if (vc)
2898                         fbcon_set_disp(info, &var, vc);
2899                 else
2900                         fbcon_preset_disp(info, &var, i);
2901
2902         }
2903 }
2904
2905 static int fbcon_event_notify(struct notifier_block *self,
2906                               unsigned long action, void *data)
2907 {
2908         struct fb_event *event = data;
2909         struct fb_info *info = event->info;
2910         struct fb_videomode *mode;
2911         struct fb_con2fbmap *con2fb;
2912         int ret = 0;
2913
2914         switch(action) {
2915         case FB_EVENT_SUSPEND:
2916                 fbcon_suspended(info);
2917                 break;
2918         case FB_EVENT_RESUME:
2919                 fbcon_resumed(info);
2920                 break;
2921         case FB_EVENT_MODE_CHANGE:
2922                 fbcon_modechanged(info);
2923                 break;
2924         case FB_EVENT_MODE_CHANGE_ALL:
2925                 fbcon_set_all_vcs(info);
2926                 break;
2927         case FB_EVENT_MODE_DELETE:
2928                 mode = event->data;
2929                 ret = fbcon_mode_deleted(info, mode);
2930                 break;
2931         case FB_EVENT_FB_REGISTERED:
2932                 ret = fbcon_fb_registered(info->node);
2933                 break;
2934         case FB_EVENT_SET_CONSOLE_MAP:
2935                 con2fb = event->data;
2936                 ret = set_con2fb_map(con2fb->console - 1,
2937                                      con2fb->framebuffer, 1);
2938                 break;
2939         case FB_EVENT_GET_CONSOLE_MAP:
2940                 con2fb = event->data;
2941                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
2942                 break;
2943         case FB_EVENT_BLANK:
2944                 fbcon_fb_blanked(info, *(int *)event->data);
2945                 break;
2946         case FB_EVENT_NEW_MODELIST:
2947                 fbcon_new_modelist(info);
2948                 break;
2949         case FB_EVENT_SET_CON_ROTATE:
2950                 fbcon_rotate(info, *(int *)event->data);
2951                 break;
2952         case FB_EVENT_GET_CON_ROTATE:
2953                 ret = fbcon_get_rotate(info);
2954                 break;
2955         case FB_EVENT_SET_CON_ROTATE_ALL:
2956                 fbcon_rotate_all(info, *(int *)event->data);
2957         }
2958
2959         return ret;
2960 }
2961
2962 /*
2963  *  The console `switch' structure for the frame buffer based console
2964  */
2965
2966 static const struct consw fb_con = {
2967         .owner                  = THIS_MODULE,
2968         .con_startup            = fbcon_startup,
2969         .con_init               = fbcon_init,
2970         .con_deinit             = fbcon_deinit,
2971         .con_clear              = fbcon_clear,
2972         .con_putc               = fbcon_putc,
2973         .con_putcs              = fbcon_putcs,
2974         .con_cursor             = fbcon_cursor,
2975         .con_scroll             = fbcon_scroll,
2976         .con_bmove              = fbcon_bmove,
2977         .con_switch             = fbcon_switch,
2978         .con_blank              = fbcon_blank,
2979         .con_font_set           = fbcon_set_font,
2980         .con_font_get           = fbcon_get_font,
2981         .con_font_default       = fbcon_set_def_font,
2982         .con_font_copy          = fbcon_copy_font,
2983         .con_set_palette        = fbcon_set_palette,
2984         .con_scrolldelta        = fbcon_scrolldelta,
2985         .con_set_origin         = fbcon_set_origin,
2986         .con_invert_region      = fbcon_invert_region,
2987         .con_screen_pos         = fbcon_screen_pos,
2988         .con_getxy              = fbcon_getxy,
2989         .con_resize             = fbcon_resize,
2990 };
2991
2992 static struct notifier_block fbcon_event_notifier = {
2993         .notifier_call  = fbcon_event_notify,
2994 };
2995
2996 static int __init fb_console_init(void)
2997 {
2998         int i;
2999
3000         acquire_console_sem();
3001         fb_register_client(&fbcon_event_notifier);
3002         release_console_sem();
3003
3004         for (i = 0; i < MAX_NR_CONSOLES; i++)
3005                 con2fb_map[i] = -1;
3006
3007         if (num_registered_fb) {
3008                 for (i = 0; i < FB_MAX; i++) {
3009                         if (registered_fb[i] != NULL) {
3010                                 info_idx = i;
3011                                 break;
3012                         }
3013                 }
3014                 fbcon_takeover(0);
3015         }
3016
3017         return 0;
3018 }
3019
3020 module_init(fb_console_init);
3021
3022 #ifdef MODULE
3023
3024 static void __exit fb_console_exit(void)
3025 {
3026         acquire_console_sem();
3027         fb_unregister_client(&fbcon_event_notifier);
3028         release_console_sem();
3029         give_up_console(&fb_con);
3030 }
3031
3032 module_exit(fb_console_exit);
3033
3034 #endif
3035
3036 MODULE_LICENSE("GPL");