drivers/video/console/fbcon.c

   1 /*
   2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1995 Geert Uytterhoeven
   5  *
   6  *
   7  *  This file is based on the original Amiga console driver (amicon.c):
   8  *
   9  *      Copyright (C) 1993 Hamish Macdonald
  10  *                         Greg Harp
  11  *      Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
  12  *
  13  *            with work by William Rucklidge (wjr@cs.cornell.edu)
  14  *                         Geert Uytterhoeven
  15  *                         Jes Sorensen (jds@kom.auc.dk)
  16  *                         Martin Apel
  17  *
  18  *  and on the original Atari console driver (atacon.c):
  19  *
  20  *      Copyright (C) 1993 Bjoern Brauel
  21  *                         Roman Hodek
  22  *
  23  *            with work by Guenther Kelleter
  24  *                         Martin Schaller
  25  *                         Andreas Schwab
  26  *
  27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
  28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
  29  *  and software scrollback added by
  30  *                         Jakub Jelinek (jj@ultra.linux.cz)
  31  *
  32  *  Random hacking by Martin Mares <mj@ucw.cz>
  33  *
  34  *      2001 - Documented with DocBook
  35  *      - Brad Douglas <brad@neruo.com>
  36  *
  37  *  The low level operations for the various display memory organizations are
  38  *  now in separate source files.
  39  *
  40  *  Currently the following organizations are supported:
  41  *
  42  *    o afb                     Amiga bitplanes
  43  *    o cfb{2,4,8,16,24,32}     Packed pixels
  44  *    o ilbm                    Amiga interleaved bitplanes
  45  *    o iplan2p[248]            Atari interleaved bitplanes
  46  *    o mfb                     Monochrome
  47  *    o vga                     VGA characters/attributes
  48  *
  49  *  To do:
  50  *
  51  *    - Implement 16 plane mode (iplan2p16)
  52  *
  53  *
  54  *  This file is subject to the terms and conditions of the GNU General Public
  55  *  License.  See the file COPYING in the main directory of this archive for
  56  *  more details.
  57  */
  58
  59 #undef FBCONDEBUG
  60
  61 #include <linux/config.h>
  62 #include <linux/module.h>
  63 #include <linux/types.h>
  64 #include <linux/sched.h>
  65 #include <linux/fs.h>
  66 #include <linux/kernel.h>
  67 #include <linux/delay.h>        /* MSch: for IRQ probe */
  68 #include <linux/tty.h>
  69 #include <linux/console.h>
  70 #include <linux/string.h>
  71 #include <linux/kd.h>
  72 #include <linux/slab.h>
  73 #include <linux/fb.h>
  74 #include <linux/vt_kern.h>
  75 #include <linux/selection.h>
  76 #include <linux/font.h>
  77 #include <linux/smp.h>
  78 #include <linux/init.h>
  79 #include <linux/interrupt.h>
  80 #include <linux/crc32.h> /* For counting font checksums */
  81 #include <asm/irq.h>
  82 #include <asm/system.h>
  83 #include <asm/uaccess.h>
  84 #ifdef CONFIG_ATARI
  85 #include <asm/atariints.h>
  86 #endif
  87 #ifdef CONFIG_MAC
  88 #include <asm/macints.h>
  89 #endif
  90 #if defined(__mc68000__) || defined(CONFIG_APUS)
  91 #include <asm/machdep.h>
  92 #include <asm/setup.h>
  93 #endif
  94
  95 #include "fbcon.h"
  96 #ifdef CONFIG_BOOTSPLASH
  97 #include "../bootsplash/bootsplash.h"
  98 #endif
  99
 100 #ifdef FBCONDEBUG
 101 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
 102 #else
 103 #  define DPRINTK(fmt, args...)
 104 #endif
 105
 106 enum {
 107         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
 108         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
 109         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
 110 };
 111
 112 static struct display fb_display[MAX_NR_CONSOLES];
 113
 114 #ifdef CONFIG_BOOTSPLASH
 115 signed char con2fb_map[MAX_NR_CONSOLES];
 116 #else
 117 static signed char con2fb_map[MAX_NR_CONSOLES];
 118 #endif
 119 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
 120 static int logo_height;
 121 static int logo_lines;
 122 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 123    enums.  */
 124 static int logo_shown = FBCON_LOGO_CANSHOW;
 125 /* Software scrollback */
 126 static int fbcon_softback_size = 32768;
 127 static unsigned long softback_buf, softback_curr;
 128 static unsigned long softback_in;
 129 static unsigned long softback_top, softback_end;
 130 static int softback_lines;
 131 /* console mappings */
 132 static int first_fb_vc;
 133 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 134 static int fbcon_is_default = 1;
 135 /* font data */
 136 static char fontname[40];
 137
 138 /* current fb_info */
 139 static int info_idx = -1;
 140
 141 /* console rotation */
 142 static int rotate;
 143
 144 static const struct consw fb_con;
 145
 146 #define CM_SOFTBACK     (8)
 147
 148 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 149
 150 static void fbcon_free_font(struct display *);
 151 static int fbcon_set_origin(struct vc_data *);
 152
 153 #define CURSOR_DRAW_DELAY               (1)
 154
 155 /* # VBL ints between cursor state changes */
 156 #define ATARI_CURSOR_BLINK_RATE         (42)
 157 #define MAC_CURSOR_BLINK_RATE           (32)
 158 #define DEFAULT_CURSOR_BLINK_RATE       (20)
 159
 160 static int vbl_cursor_cnt;
 161
 162 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 163
 164 /*
 165  *  Interface used by the world
 166  */
 167
 168 static const char *fbcon_startup(void);
 169 static void fbcon_init(struct vc_data *vc, int init);
 170 static void fbcon_deinit(struct vc_data *vc);
 171 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 172                         int width);
 173 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
 174 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 175                         int count, int ypos, int xpos);
 176 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 177 static void fbcon_cursor(struct vc_data *vc, int mode);
 178 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 179                         int count);
 180 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
 181                         int height, int width);
 182 static int fbcon_switch(struct vc_data *vc);
 183 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
 184 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
 185 static int fbcon_scrolldelta(struct vc_data *vc, int lines);
 186
 187 /*
 188  *  Internal routines
 189  */
 190 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 191 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 192 static __inline__ void ypan_up(struct vc_data *vc, int count);
 193 static __inline__ void ypan_down(struct vc_data *vc, int count);
 194 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
 195                             int dy, int dx, int height, int width, u_int y_break);
 196 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 197                            struct vc_data *vc);
 198 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 199                               int unit);
 200 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 201                               int line, int count, int dy);
 202 static void fbcon_modechanged(struct fb_info *info);
 203 static void fbcon_set_all_vcs(struct fb_info *info);
 204
 205 #ifdef CONFIG_MAC
 206 /*
 207  * On the Macintoy, there may or may not be a working VBL int. We need to probe
 208  */
 209 static int vbl_detected;
 210
 211 static irqreturn_t fb_vbl_detect(int irq, void *dummy, struct pt_regs *fp)
 212 {
 213         vbl_detected++;
 214         return IRQ_HANDLED;
 215 }
 216 #endif
 217
 218 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 219 static inline void fbcon_set_rotation(struct fb_info *info)
 220 {
 221         struct fbcon_ops *ops = info->fbcon_par;
 222
 223         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
 224             ops->p->con_rotate < 4)
 225                 ops->rotate = ops->p->con_rotate;
 226         else
 227                 ops->rotate = 0;
 228 }
 229
 230 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 231 {
 232         struct fbcon_ops *ops= info->fbcon_par;
 233         struct fb_info *fb_info;
 234
 235         if (!ops || ops->currcon == -1)
 236                 return;
 237
 238         fb_info = registered_fb[con2fb_map[ops->currcon]];
 239
 240         if (info == fb_info) {
 241                 struct display *p = &fb_display[ops->currcon];
 242
 243                 if (rotate < 4)
 244                         p->con_rotate = rotate;
 245                 else
 246                         p->con_rotate = 0;
 247
 248                 fbcon_modechanged(info);
 249         }
 250 }
 251
 252 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 253 {
 254         struct fbcon_ops *ops = info->fbcon_par;
 255         struct vc_data *vc;
 256         struct display *p;
 257         int i;
 258
 259         if (!ops || ops->currcon < 0 || rotate > 3)
 260                 return;
 261
 262         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 263                 vc = vc_cons[i].d;
 264                 if (!vc || vc->vc_mode != KD_TEXT ||
 265                     registered_fb[con2fb_map[i]] != info)
 266                         continue;
 267
 268                 p = &fb_display[vc->vc_num];
 269                 p->con_rotate = rotate;
 270         }
 271
 272         fbcon_set_all_vcs(info);
 273 }
 274 #else
 275 static inline void fbcon_set_rotation(struct fb_info *info)
 276 {
 277         struct fbcon_ops *ops = info->fbcon_par;
 278
 279         ops->rotate = FB_ROTATE_UR;
 280 }
 281
 282 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 283 {
 284         return;
 285 }
 286
 287 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 288 {
 289         return;
 290 }
 291 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 292
 293 static int fbcon_get_rotate(struct fb_info *info)
 294 {
 295         struct fbcon_ops *ops = info->fbcon_par;
 296
 297         return (ops) ? ops->rotate : 0;
 298 }
 299
 300 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 301 {
 302         struct fbcon_ops *ops = info->fbcon_par;
 303
 304         return (info->state != FBINFO_STATE_RUNNING ||
 305                 vc->vc_mode != KD_TEXT || ops->graphics);
 306 }
 307
 308 static inline int get_color(struct vc_data *vc, struct fb_info *info,
 309               u16 c, int is_fg)
 310 {
 311         int depth = fb_get_color_depth(&info->var, &info->fix);
 312         int color = 0;
 313
 314         if (console_blanked) {
 315                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 316
 317                 c = vc->vc_video_erase_char & charmask;
 318         }
 319
 320         if (depth != 1)
 321                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 322                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 323
 324         switch (depth) {
 325         case 1:
 326         {
 327                 int col = ~(0xfff << (max(info->var.green.length,
 328                                           max(info->var.red.length,
 329                                               info->var.blue.length)))) & 0xff;
 330
 331                 /* 0 or 1 */
 332                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 333                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 334
 335                 if (console_blanked)
 336                         fg = bg;
 337
 338                 color = (is_fg) ? fg : bg;
 339                 break;
 340         }
 341         case 2:
 342                 /*
 343                  * Scale down 16-colors to 4 colors. Default 4-color palette
 344                  * is grayscale. However, simply dividing the values by 4
 345                  * will not work, as colors 1, 2 and 3 will be scaled-down
 346                  * to zero rendering them invisible.  So empirically convert
 347                  * colors to a sane 4-level grayscale.
 348                  */
 349                 switch (color) {
 350                 case 0:
 351                         color = 0; /* black */
 352                         break;
 353                 case 1 ... 6:
 354                         color = 2; /* white */
 355                         break;
 356                 case 7 ... 8:
 357                         color = 1; /* gray */
 358                         break;
 359                 default:
 360                         color = 3; /* intense white */
 361                         break;
 362                 }
 363                 break;
 364         case 3:
 365                 /*
 366                  * Last 8 entries of default 16-color palette is a more intense
 367                  * version of the first 8 (i.e., same chrominance, different
 368                  * luminance).
 369                  */
 370                 color &= 7;
 371                 break;
 372         }
 373
 374
 375         return color;
 376 }
 377
 378 static void fbcon_update_softback(struct vc_data *vc)
 379 {
 380         int l = fbcon_softback_size / vc->vc_size_row;
 381
 382         if (l > 5)
 383                 softback_end = softback_buf + l * vc->vc_size_row;
 384         else
 385                 /* Smaller scrollback makes no sense, and 0 would screw
 386                    the operation totally */
 387                 softback_top = 0;
 388 }
 389
 390 static void fb_flashcursor(void *private)
 391 {
 392         struct fb_info *info = private;
 393         struct fbcon_ops *ops = info->fbcon_par;
 394         struct display *p;
 395         struct vc_data *vc = NULL;
 396         int c;
 397         int mode;
 398
 399         if (ops->currcon != -1)
 400                 vc = vc_cons[ops->currcon].d;
 401
 402         if (!vc || !CON_IS_VISIBLE(vc) ||
 403             fbcon_is_inactive(vc, info) ||
 404             registered_fb[con2fb_map[vc->vc_num]] != info ||
 405             vc_cons[ops->currcon].d->vc_deccm != 1)
 406                 return;
 407         acquire_console_sem();
 408         p = &fb_display[vc->vc_num];
 409         c = scr_readw((u16 *) vc->vc_pos);
 410         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 411                 CM_ERASE : CM_DRAW;
 412         ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
 413                     get_color(vc, info, c, 0));
 414         release_console_sem();
 415 }
 416
 417 #if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
 418 static int cursor_blink_rate;
 419 static irqreturn_t fb_vbl_handler(int irq, void *dev_id, struct pt_regs *fp)
 420 {
 421         struct fb_info *info = dev_id;
 422
 423         if (vbl_cursor_cnt && --vbl_cursor_cnt == 0) {
 424                 schedule_work(&info->queue);
 425                 vbl_cursor_cnt = cursor_blink_rate;
 426         }
 427         return IRQ_HANDLED;
 428 }
 429 #endif
 430
 431 static void cursor_timer_handler(unsigned long dev_addr)
 432 {
 433         struct fb_info *info = (struct fb_info *) dev_addr;
 434         struct fbcon_ops *ops = info->fbcon_par;
 435
 436         schedule_work(&info->queue);
 437         mod_timer(&ops->cursor_timer, jiffies + HZ/5);
 438 }
 439
 440 static void fbcon_add_cursor_timer(struct fb_info *info)
 441 {
 442         struct fbcon_ops *ops = info->fbcon_par;
 443
 444         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
 445             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER)) {
 446                 if (!info->queue.func)
 447                         INIT_WORK(&info->queue, fb_flashcursor, info);
 448
 449                 init_timer(&ops->cursor_timer);
 450                 ops->cursor_timer.function = cursor_timer_handler;
 451                 ops->cursor_timer.expires = jiffies + HZ / 5;
 452                 ops->cursor_timer.data = (unsigned long ) info;
 453                 add_timer(&ops->cursor_timer);
 454                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
 455         }
 456 }
 457
 458 static void fbcon_del_cursor_timer(struct fb_info *info)
 459 {
 460         struct fbcon_ops *ops = info->fbcon_par;
 461
 462         if (info->queue.func == fb_flashcursor &&
 463             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
 464                 del_timer_sync(&ops->cursor_timer);
 465                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
 466         }
 467 }
 468
 469 #ifndef MODULE
 470 static int __init fb_console_setup(char *this_opt)
 471 {
 472         char *options;
 473         int i, j;
 474
 475         if (!this_opt || !*this_opt)
 476                 return 1;
 477
 478         while ((options = strsep(&this_opt, ",")) != NULL) {
 479                 if (!strncmp(options, "font:", 5))
 480                         strcpy(fontname, options + 5);
 481
 482                 if (!strncmp(options, "scrollback:", 11)) {
 483                         options += 11;
 484                         if (*options) {
 485                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
 486                                 if (*options == 'k' || *options == 'K') {
 487                                         fbcon_softback_size *= 1024;
 488                                         options++;
 489                                 }
 490                                 if (*options != ',')
 491                                         return 1;
 492                                 options++;
 493                         } else
 494                                 return 1;
 495                 }
 496
 497                 if (!strncmp(options, "map:", 4)) {
 498                         options += 4;
 499                         if (*options)
 500                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 501                                         if (!options[j])
 502                                                 j = 0;
 503                                         con2fb_map_boot[i] =
 504                                                 (options[j++]-'0') % FB_MAX;
 505                                 }
 506                         return 1;
 507                 }
 508
 509                 if (!strncmp(options, "vc:", 3)) {
 510                         options += 3;
 511                         if (*options)
 512                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 513                         if (first_fb_vc < 0)
 514                                 first_fb_vc = 0;
 515                         if (*options++ == '-')
 516                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 517                         fbcon_is_default = 0;
 518                 }
 519
 520                 if (!strncmp(options, "rotate:", 7)) {
 521                         options += 7;
 522                         if (*options)
 523                                 rotate = simple_strtoul(options, &options, 0);
 524                         if (rotate > 3)
 525                                 rotate = 0;
 526                 }
 527         }
 528         return 1;
 529 }
 530
 531 __setup("fbcon=", fb_console_setup);
 532 #endif
 533
 534 static int search_fb_in_map(int idx)
 535 {
 536         int i, retval = 0;
 537
 538         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 539                 if (con2fb_map[i] == idx)
 540                         retval = 1;
 541         }
 542         return retval;
 543 }
 544
 545 static int search_for_mapped_con(void)
 546 {
 547         int i, retval = 0;
 548
 549         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 550                 if (con2fb_map[i] != -1)
 551                         retval = 1;
 552         }
 553         return retval;
 554 }
 555
 556 static int fbcon_takeover(int show_logo)
 557 {
 558         int err, i;
 559
 560         if (!num_registered_fb)
 561                 return -ENODEV;
 562
 563         if (!show_logo)
 564                 logo_shown = FBCON_LOGO_DONTSHOW;
 565
 566         for (i = first_fb_vc; i <= last_fb_vc; i++)
 567                 con2fb_map[i] = info_idx;
 568
 569 #ifdef CONFIG_BOOTSPLASH
 570         splash_init();
 571 #endif
 572
 573         err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 574                                 fbcon_is_default);
 575         if (err) {
 576                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
 577                         con2fb_map[i] = -1;
 578                 }
 579                 info_idx = -1;
 580         }
 581
 582         return err;
 583 }
 584
 585 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 586                                int cols, int rows, int new_cols, int new_rows)
 587 {
 588         /* Need to make room for the logo */
 589         struct fbcon_ops *ops = info->fbcon_par;
 590         int cnt, erase = vc->vc_video_erase_char, step;
 591         unsigned short *save = NULL, *r, *q;
 592
 593         /*
 594          * remove underline attribute from erase character
 595          * if black and white framebuffer.
 596          */
 597         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 598                 erase &= ~0x400;
 599         logo_height = fb_prepare_logo(info, ops->rotate);
 600         logo_lines = (logo_height + vc->vc_font.height - 1) /
 601                 vc->vc_font.height;
 602         q = (unsigned short *) (vc->vc_origin +
 603                                 vc->vc_size_row * rows);
 604         step = logo_lines * cols;
 605         for (r = q - logo_lines * cols; r < q; r++)
 606                 if (scr_readw(r) != vc->vc_video_erase_char)
 607                         break;
 608         if (r != q && new_rows >= rows + logo_lines) {
 609                 save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
 610                 if (save) {
 611                         int i = cols < new_cols ? cols : new_cols;
 612                         scr_memsetw(save, erase, logo_lines * new_cols * 2);
 613                         r = q - step;
 614                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 615                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 616                         r = q;
 617                 }
 618         }
 619         if (r == q) {
 620                 /* We can scroll screen down */
 621                 r = q - step - cols;
 622                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 623                         scr_memcpyw(r + step, r, vc->vc_size_row);
 624                         r -= cols;
 625                 }
 626                 if (!save) {
 627                         vc->vc_y += logo_lines;
 628                         vc->vc_pos += logo_lines * vc->vc_size_row;
 629                 }
 630         }
 631         scr_memsetw((unsigned short *) vc->vc_origin,
 632                     erase,
 633                     vc->vc_size_row * logo_lines);
 634
 635         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
 636                 fbcon_clear_margins(vc, 0);
 637                 update_screen(vc);
 638         }
 639
 640         if (save) {
 641                 q = (unsigned short *) (vc->vc_origin +
 642                                         vc->vc_size_row *
 643                                         rows);
 644                 scr_memcpyw(q, save, logo_lines * new_cols * 2);
 645                 vc->vc_y += logo_lines;
 646                 vc->vc_pos += logo_lines * vc->vc_size_row;
 647                 kfree(save);
 648         }
 649
 650         if (logo_lines > vc->vc_bottom) {
 651                 logo_shown = FBCON_LOGO_CANSHOW;
 652                 printk(KERN_INFO
 653                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
 654         } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
 655                 logo_shown = FBCON_LOGO_DRAW;
 656                 vc->vc_top = logo_lines;
 657         }
 658 }
 659
 660 #ifdef CONFIG_FB_TILEBLITTING
 661 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 662 {
 663         struct fbcon_ops *ops = info->fbcon_par;
 664
 665         ops->p = &fb_display[vc->vc_num];
 666
 667         if ((info->flags & FBINFO_MISC_TILEBLITTING))
 668                 fbcon_set_tileops(vc, info);
 669         else {
 670                 fbcon_set_rotation(info);
 671                 fbcon_set_bitops(ops);
 672         }
 673 }
 674 #else
 675 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 676 {
 677         struct fbcon_ops *ops = info->fbcon_par;
 678
 679         info->flags &= ~FBINFO_MISC_TILEBLITTING;
 680         ops->p = &fb_display[vc->vc_num];
 681         fbcon_set_rotation(info);
 682         fbcon_set_bitops(ops);
 683 }
 684 #endif /* CONFIG_MISC_TILEBLITTING */
 685
 686
 687 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
 688                                   int unit, int oldidx)
 689 {
 690         struct fbcon_ops *ops = NULL;
 691         int err = 0;
 692
 693         if (!try_module_get(info->fbops->owner))
 694                 err = -ENODEV;
 695
 696         if (!err && info->fbops->fb_open &&
 697             info->fbops->fb_open(info, 0))
 698                 err = -ENODEV;
 699
 700         if (!err) {
 701                 ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 702                 if (!ops)
 703                         err = -ENOMEM;
 704         }
 705
 706         if (!err) {
 707                 info->fbcon_par = ops;
 708                 set_blitting_type(vc, info);
 709         }
 710
 711         if (err) {
 712                 con2fb_map[unit] = oldidx;
 713                 module_put(info->fbops->owner);
 714         }
 715
 716         return err;
 717 }
 718
 719 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 720                                   struct fb_info *newinfo, int unit,
 721                                   int oldidx, int found)
 722 {
 723         struct fbcon_ops *ops = oldinfo->fbcon_par;
 724         int err = 0;
 725
 726         if (oldinfo->fbops->fb_release &&
 727             oldinfo->fbops->fb_release(oldinfo, 0)) {
 728                 con2fb_map[unit] = oldidx;
 729                 if (!found && newinfo->fbops->fb_release)
 730                         newinfo->fbops->fb_release(newinfo, 0);
 731                 if (!found)
 732                         module_put(newinfo->fbops->owner);
 733                 err = -ENODEV;
 734         }
 735
 736         if (!err) {
 737                 fbcon_del_cursor_timer(oldinfo);
 738                 kfree(ops->cursor_state.mask);
 739                 kfree(ops->cursor_data);
 740                 kfree(ops->fontbuffer);
 741                 kfree(oldinfo->fbcon_par);
 742                 oldinfo->fbcon_par = NULL;
 743                 module_put(oldinfo->fbops->owner);
 744                 /*
 745                   If oldinfo and newinfo are driving the same hardware,
 746                   the fb_release() method of oldinfo may attempt to
 747                   restore the hardware state.  This will leave the
 748                   newinfo in an undefined state. Thus, a call to
 749                   fb_set_par() may be needed for the newinfo.
 750                 */
 751                 if (newinfo->fbops->fb_set_par)
 752                         newinfo->fbops->fb_set_par(newinfo);
 753         }
 754
 755         return err;
 756 }
 757
 758 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 759                                 int unit, int show_logo)
 760 {
 761         struct fbcon_ops *ops = info->fbcon_par;
 762
 763         ops->currcon = fg_console;
 764
 765         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT))
 766                 info->fbops->fb_set_par(info);
 767
 768         ops->flags |= FBCON_FLAGS_INIT;
 769         ops->graphics = 0;
 770
 771         if (vc)
 772                 fbcon_set_disp(info, &info->var, vc);
 773         else
 774                 fbcon_preset_disp(info, &info->var, unit);
 775
 776         if (show_logo) {
 777                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 778                 struct fb_info *fg_info =
 779                         registered_fb[con2fb_map[fg_console]];
 780
 781                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 782                                    fg_vc->vc_rows, fg_vc->vc_cols,
 783                                    fg_vc->vc_rows);
 784         }
 785
 786         update_screen(vc_cons[fg_console].d);
 787 }
 788
 789 /**
 790  *      set_con2fb_map - map console to frame buffer device
 791  *      @unit: virtual console number to map
 792  *      @newidx: frame buffer index to map virtual console to
 793  *      @user: user request
 794  *
 795  *      Maps a virtual console @unit to a frame buffer device
 796  *      @newidx.
 797  */
 798 static int set_con2fb_map(int unit, int newidx, int user)
 799 {
 800         struct vc_data *vc = vc_cons[unit].d;
 801         int oldidx = con2fb_map[unit];
 802         struct fb_info *info = registered_fb[newidx];
 803         struct fb_info *oldinfo = NULL;
 804         int found, err = 0;
 805
 806         if (oldidx == newidx)
 807                 return 0;
 808
 809         if (!info)
 810                 err =  -EINVAL;
 811
 812         if (!err && !search_for_mapped_con()) {
 813                 info_idx = newidx;
 814                 return fbcon_takeover(0);
 815         }
 816
 817         if (oldidx != -1)
 818                 oldinfo = registered_fb[oldidx];
 819
 820         found = search_fb_in_map(newidx);
 821
 822         acquire_console_sem();
 823         con2fb_map[unit] = newidx;
 824         if (!err && !found)
 825                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 826
 827
 828         /*
 829          * If old fb is not mapped to any of the consoles,
 830          * fbcon should release it.
 831          */
 832         if (!err && oldinfo && !search_fb_in_map(oldidx))
 833                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 834                                              found);
 835
 836         if (!err) {
 837                 int show_logo = (fg_console == 0 && !user &&
 838                                  logo_shown != FBCON_LOGO_DONTSHOW);
 839
 840                 if (!found)
 841                         fbcon_add_cursor_timer(info);
 842                 con2fb_map_boot[unit] = newidx;
 843                 con2fb_init_display(vc, info, unit, show_logo);
 844         }
 845
 846         release_console_sem();
 847         return err;
 848 }
 849
 850 /*
 851  *  Low Level Operations
 852  */
 853 /* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
 854 static int var_to_display(struct display *disp,
 855                           struct fb_var_screeninfo *var,
 856                           struct fb_info *info)
 857 {
 858         disp->xres_virtual = var->xres_virtual;
 859         disp->yres_virtual = var->yres_virtual;
 860         disp->bits_per_pixel = var->bits_per_pixel;
 861         disp->grayscale = var->grayscale;
 862         disp->nonstd = var->nonstd;
 863         disp->accel_flags = var->accel_flags;
 864         disp->height = var->height;
 865         disp->width = var->width;
 866         disp->red = var->red;
 867         disp->green = var->green;
 868         disp->blue = var->blue;
 869         disp->transp = var->transp;
 870         disp->rotate = var->rotate;
 871         disp->mode = fb_match_mode(var, &info->modelist);
 872         if (disp->mode == NULL)
 873                 /* This should not happen */
 874                 return -EINVAL;
 875         return 0;
 876 }
 877
 878 static void display_to_var(struct fb_var_screeninfo *var,
 879                            struct display *disp)
 880 {
 881         fb_videomode_to_var(var, disp->mode);
 882         var->xres_virtual = disp->xres_virtual;
 883         var->yres_virtual = disp->yres_virtual;
 884         var->bits_per_pixel = disp->bits_per_pixel;
 885         var->grayscale = disp->grayscale;
 886         var->nonstd = disp->nonstd;
 887         var->accel_flags = disp->accel_flags;
 888         var->height = disp->height;
 889         var->width = disp->width;
 890         var->red = disp->red;
 891         var->green = disp->green;
 892         var->blue = disp->blue;
 893         var->transp = disp->transp;
 894         var->rotate = disp->rotate;
 895 }
 896
 897 static const char *fbcon_startup(void)
 898 {
 899         const char *display_desc = "frame buffer device";
 900         struct display *p = &fb_display[fg_console];
 901         struct vc_data *vc = vc_cons[fg_console].d;
 902         const struct font_desc *font = NULL;
 903         struct module *owner;
 904         struct fb_info *info = NULL;
 905         struct fbcon_ops *ops;
 906         int rows, cols;
 907         int irqres;
 908
 909         irqres = 1;
 910         /*
 911          *  If num_registered_fb is zero, this is a call for the dummy part.
 912          *  The frame buffer devices weren't initialized yet.
 913          */
 914         if (!num_registered_fb || info_idx == -1)
 915                 return display_desc;
 916         /*
 917          * Instead of blindly using registered_fb[0], we use info_idx, set by
 918          * fb_console_init();
 919          */
 920         info = registered_fb[info_idx];
 921         if (!info)
 922                 return NULL;
 923
 924         owner = info->fbops->owner;
 925         if (!try_module_get(owner))
 926                 return NULL;
 927         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 928                 module_put(owner);
 929                 return NULL;
 930         }
 931
 932         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 933         if (!ops) {
 934                 module_put(owner);
 935                 return NULL;
 936         }
 937
 938         ops->currcon = -1;
 939         ops->graphics = 1;
 940         ops->cur_rotate = -1;
 941         info->fbcon_par = ops;
 942         p->con_rotate = rotate;
 943         set_blitting_type(vc, info);
 944
 945         if (info->fix.type != FB_TYPE_TEXT) {
 946                 if (fbcon_softback_size) {
 947                         if (!softback_buf) {
 948                                 softback_buf =
 949                                     (unsigned long)
 950                                     kmalloc(fbcon_softback_size,
 951                                             GFP_KERNEL);
 952                                 if (!softback_buf) {
 953                                         fbcon_softback_size = 0;
 954                                         softback_top = 0;
 955                                 }
 956                         }
 957                 } else {
 958                         if (softback_buf) {
 959                                 kfree((void *) softback_buf);
 960                                 softback_buf = 0;
 961                                 softback_top = 0;
 962                         }
 963                 }
 964                 if (softback_buf)
 965                         softback_in = softback_top = softback_curr =
 966                             softback_buf;
 967                 softback_lines = 0;
 968         }
 969
 970         /* Setup default font */
 971         if (!p->fontdata) {
 972                 if (!fontname[0] || !(font = find_font(fontname)))
 973                         font = get_default_font(info->var.xres,
 974                                                 info->var.yres);
 975                 vc->vc_font.width = font->width;
 976                 vc->vc_font.height = font->height;
 977                 vc->vc_font.data = (void *)(p->fontdata = font->data);
 978                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
 979         }
 980
 981         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
 982         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
 983         cols /= vc->vc_font.width;
 984         rows /= vc->vc_font.height;
 985         vc_resize(vc, cols, rows);
 986
 987         DPRINTK("mode:   %s\n", info->fix.id);
 988         DPRINTK("visual: %d\n", info->fix.visual);
 989         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
 990                 info->var.yres,
 991                 info->var.bits_per_pixel);
 992
 993 #ifdef CONFIG_ATARI
 994         if (MACH_IS_ATARI) {
 995                 cursor_blink_rate = ATARI_CURSOR_BLINK_RATE;
 996                 irqres =
 997                     request_irq(IRQ_AUTO_4, fb_vbl_handler,
 998                                 IRQ_TYPE_PRIO, "framebuffer vbl",
 999                                 info);
1000         }
1001 #endif                          /* CONFIG_ATARI */
1002
1003 #ifdef CONFIG_MAC
1004         /*
1005          * On a Macintoy, the VBL interrupt may or may not be active.
1006          * As interrupt based cursor is more reliable and race free, we
1007          * probe for VBL interrupts.
1008          */
1009         if (MACH_IS_MAC) {
1010                 int ct = 0;
1011                 /*
1012                  * Probe for VBL: set temp. handler ...
1013                  */
1014                 irqres = request_irq(IRQ_MAC_VBL, fb_vbl_detect, 0,
1015                                      "framebuffer vbl", info);
1016                 vbl_detected = 0;
1017
1018                 /*
1019                  * ... and spin for 20 ms ...
1020                  */
1021                 while (!vbl_detected && ++ct < 1000)
1022                         udelay(20);
1023
1024                 if (ct == 1000)
1025                         printk
1026                             ("fbcon_startup: No VBL detected, using timer based cursor.\n");
1027
1028                 free_irq(IRQ_MAC_VBL, fb_vbl_detect);
1029
1030                 if (vbl_detected) {
1031                         /*
1032                          * interrupt based cursor ok
1033                          */
1034                         cursor_blink_rate = MAC_CURSOR_BLINK_RATE;
1035                         irqres =
1036                             request_irq(IRQ_MAC_VBL, fb_vbl_handler, 0,
1037                                         "framebuffer vbl", info);
1038                 } else {
1039                         /*
1040                          * VBL not detected: fall through, use timer based cursor
1041                          */
1042                         irqres = 1;
1043                 }
1044         }
1045 #endif                          /* CONFIG_MAC */
1046
1047         fbcon_add_cursor_timer(info);
1048         return display_desc;
1049 }
1050
1051 static void fbcon_init(struct vc_data *vc, int init)
1052 {
1053         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1054         struct fbcon_ops *ops;
1055         struct vc_data **default_mode = vc->vc_display_fg;
1056         struct vc_data *svc = *default_mode;
1057         struct display *t, *p = &fb_display[vc->vc_num];
1058         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1059         int cap;
1060
1061         if (info_idx == -1 || info == NULL)
1062             return;
1063
1064         cap = info->flags;
1065
1066         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1067             (info->fix.type == FB_TYPE_TEXT))
1068                 logo = 0;
1069
1070         if (var_to_display(p, &info->var, info))
1071                 return;
1072
1073         /* If we are not the first console on this
1074            fb, copy the font from that console */
1075         t = &fb_display[svc->vc_num];
1076         if (!vc->vc_font.data) {
1077                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1078                 vc->vc_font.width = (*default_mode)->vc_font.width;
1079                 vc->vc_font.height = (*default_mode)->vc_font.height;
1080                 p->userfont = t->userfont;
1081                 if (p->userfont)
1082                         REFCOUNT(p->fontdata)++;
1083         }
1084         if (p->userfont)
1085                 charcnt = FNTCHARCNT(p->fontdata);
1086         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1087         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1088         if (charcnt == 256) {
1089                 vc->vc_hi_font_mask = 0;
1090         } else {
1091                 vc->vc_hi_font_mask = 0x100;
1092                 if (vc->vc_can_do_color)
1093                         vc->vc_complement_mask <<= 1;
1094         }
1095
1096         if (!*svc->vc_uni_pagedir_loc)
1097                 con_set_default_unimap(svc);
1098         if (!*vc->vc_uni_pagedir_loc)
1099                 con_copy_unimap(vc, svc);
1100
1101         ops = info->fbcon_par;
1102         p->con_rotate = rotate;
1103         set_blitting_type(vc, info);
1104
1105         cols = vc->vc_cols;
1106         rows = vc->vc_rows;
1107         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1108         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1109         new_cols /= vc->vc_font.width;
1110         new_rows /= vc->vc_font.height;
1111
1112 #ifdef CONFIG_BOOTSPLASH
1113         if (vc->vc_splash_data && vc->vc_splash_data->splash_state) {
1114                 new_cols = vc->vc_splash_data->splash_text_wi / vc->vc_font.width;
1115                 new_rows = vc->vc_splash_data->splash_text_he / vc->vc_font.height;
1116                 logo = 0;
1117                 con_remap_def_color(vc, vc->vc_splash_data->splash_color << 4 | vc->vc_splash_data->splash_fg_color);
1118         }
1119 #endif
1120
1121         vc_resize(vc, new_cols, new_rows);
1122
1123         /*
1124          * We must always set the mode. The mode of the previous console
1125          * driver could be in the same resolution but we are using different
1126          * hardware so we have to initialize the hardware.
1127          *
1128          * We need to do it in fbcon_init() to prevent screen corruption.
1129          */
1130         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
1131                 if (info->fbops->fb_set_par &&
1132                     !(ops->flags & FBCON_FLAGS_INIT))
1133                         info->fbops->fb_set_par(info);
1134                 ops->flags |= FBCON_FLAGS_INIT;
1135         }
1136
1137         ops->graphics = 0;
1138
1139         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1140             !(cap & FBINFO_HWACCEL_DISABLED))
1141                 p->scrollmode = SCROLL_MOVE;
1142         else /* default to something safe */
1143                 p->scrollmode = SCROLL_REDRAW;
1144
1145         /*
1146          *  ++guenther: console.c:vc_allocate() relies on initializing
1147          *  vc_{cols,rows}, but we must not set those if we are only
1148          *  resizing the console.
1149          */
1150         if (!init) {
1151                 vc->vc_cols = new_cols;
1152                 vc->vc_rows = new_rows;
1153         }
1154
1155         if (logo)
1156                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1157
1158         if (vc == svc && softback_buf)
1159                 fbcon_update_softback(vc);
1160
1161         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1162                 ops->rotate = FB_ROTATE_UR;
1163                 set_blitting_type(vc, info);
1164         }
1165
1166         ops->p = &fb_display[fg_console];
1167 }
1168
1169 static void fbcon_deinit(struct vc_data *vc)
1170 {
1171         struct display *p = &fb_display[vc->vc_num];
1172
1173         if (info_idx != -1)
1174             return;
1175         fbcon_free_font(p);
1176 }
1177
1178 /* ====================================================================== */
1179
1180 /*  fbcon_XXX routines - interface used by the world
1181  *
1182  *  This system is now divided into two levels because of complications
1183  *  caused by hardware scrolling. Top level functions:
1184  *
1185  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1186  *
1187  *  handles y values in range [0, scr_height-1] that correspond to real
1188  *  screen positions. y_wrap shift means that first line of bitmap may be
1189  *  anywhere on this display. These functions convert lineoffsets to
1190  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1191  *
1192  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1193  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1194  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1195  *
1196  *  WARNING:
1197  *
1198  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1199  *  Implies should only really hardware scroll in rows. Only reason for
1200  *  restriction is simplicity & efficiency at the moment.
1201  */
1202
1203 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1204                         int width)
1205 {
1206         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1207         struct fbcon_ops *ops = info->fbcon_par;
1208
1209         struct display *p = &fb_display[vc->vc_num];
1210         u_int y_break;
1211
1212         if (fbcon_is_inactive(vc, info))
1213                 return;
1214
1215         if (!height || !width)
1216                 return;
1217
1218         /* Split blits that cross physical y_wrap boundary */
1219
1220         y_break = p->vrows - p->yscroll;
1221         if (sy < y_break && sy + height - 1 >= y_break) {
1222                 u_int b = y_break - sy;
1223                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1224                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1225                                  width);
1226         } else
1227                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1228 }
1229
1230 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1231                         int count, int ypos, int xpos)
1232 {
1233         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1234         struct display *p = &fb_display[vc->vc_num];
1235         struct fbcon_ops *ops = info->fbcon_par;
1236
1237         if (!fbcon_is_inactive(vc, info))
1238                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1239                            get_color(vc, info, scr_readw(s), 1),
1240                            get_color(vc, info, scr_readw(s), 0));
1241 }
1242
1243 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1244 {
1245         unsigned short chr;
1246
1247         scr_writew(c, &chr);
1248         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1249 }
1250
1251 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1252 {
1253         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1254         struct fbcon_ops *ops = info->fbcon_par;
1255
1256         if (!fbcon_is_inactive(vc, info))
1257                 ops->clear_margins(vc, info, bottom_only);
1258 }
1259
1260 static void fbcon_cursor(struct vc_data *vc, int mode)
1261 {
1262         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1263         struct fbcon_ops *ops = info->fbcon_par;
1264         int y;
1265         int c = scr_readw((u16 *) vc->vc_pos);
1266
1267         if (fbcon_is_inactive(vc, info))
1268                 return;
1269
1270         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1271         if (mode & CM_SOFTBACK) {
1272                 mode &= ~CM_SOFTBACK;
1273                 y = softback_lines;
1274         } else {
1275                 if (softback_lines)
1276                         fbcon_set_origin(vc);
1277                 y = 0;
1278         }
1279
1280         ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
1281                     get_color(vc, info, c, 0));
1282         vbl_cursor_cnt = CURSOR_DRAW_DELAY;
1283 }
1284
1285 static int scrollback_phys_max = 0;
1286 static int scrollback_max = 0;
1287 static int scrollback_current = 0;
1288
1289 /*
1290  * If no vc is existent yet, just set struct display
1291  */
1292 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1293                               int unit)
1294 {
1295         struct display *p = &fb_display[unit];
1296         struct display *t = &fb_display[fg_console];
1297
1298         if (var_to_display(p, var, info))
1299                 return;
1300
1301         p->fontdata = t->fontdata;
1302         p->userfont = t->userfont;
1303         if (p->userfont)
1304                 REFCOUNT(p->fontdata)++;
1305 }
1306
1307 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1308                            struct vc_data *vc)
1309 {
1310         struct display *p = &fb_display[vc->vc_num], *t;
1311         struct vc_data **default_mode = vc->vc_display_fg;
1312         struct vc_data *svc = *default_mode;
1313         struct fbcon_ops *ops = info->fbcon_par;
1314         int rows, cols, charcnt = 256;
1315
1316         if (var_to_display(p, var, info))
1317                 return;
1318         t = &fb_display[svc->vc_num];
1319         if (!vc->vc_font.data) {
1320                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1321                 vc->vc_font.width = (*default_mode)->vc_font.width;
1322                 vc->vc_font.height = (*default_mode)->vc_font.height;
1323                 p->userfont = t->userfont;
1324                 if (p->userfont)
1325                         REFCOUNT(p->fontdata)++;
1326         }
1327         if (p->userfont)
1328                 charcnt = FNTCHARCNT(p->fontdata);
1329
1330         var->activate = FB_ACTIVATE_NOW;
1331         info->var.activate = var->activate;
1332         var->yoffset = info->var.yoffset;
1333         var->xoffset = info->var.xoffset;
1334         fb_set_var(info, var);
1335         ops->var = info->var;
1336         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1337         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1338         if (charcnt == 256) {
1339                 vc->vc_hi_font_mask = 0;
1340         } else {
1341                 vc->vc_hi_font_mask = 0x100;
1342                 if (vc->vc_can_do_color)
1343                         vc->vc_complement_mask <<= 1;
1344         }
1345
1346         if (!*svc->vc_uni_pagedir_loc)
1347                 con_set_default_unimap(svc);
1348         if (!*vc->vc_uni_pagedir_loc)
1349                 con_copy_unimap(vc, svc);
1350
1351         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1352         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1353         cols /= vc->vc_font.width;
1354         rows /= vc->vc_font.height;
1355         vc_resize(vc, cols, rows);
1356
1357         if (CON_IS_VISIBLE(vc)) {
1358                 update_screen(vc);
1359                 if (softback_buf)
1360                         fbcon_update_softback(vc);
1361         }
1362 }
1363
1364 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1365 {
1366         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1367         struct fbcon_ops *ops = info->fbcon_par;
1368         struct display *p = &fb_display[vc->vc_num];
1369
1370         p->yscroll += count;
1371         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1372                 p->yscroll -= p->vrows;
1373         ops->var.xoffset = 0;
1374         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1375         ops->var.vmode |= FB_VMODE_YWRAP;
1376         ops->update_start(info);
1377         scrollback_max += count;
1378         if (scrollback_max > scrollback_phys_max)
1379                 scrollback_max = scrollback_phys_max;
1380         scrollback_current = 0;
1381 }
1382
1383 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1384 {
1385         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1386         struct fbcon_ops *ops = info->fbcon_par;
1387         struct display *p = &fb_display[vc->vc_num];
1388
1389         p->yscroll -= count;
1390         if (p->yscroll < 0)     /* Deal with wrap */
1391                 p->yscroll += p->vrows;
1392         ops->var.xoffset = 0;
1393         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1394         ops->var.vmode |= FB_VMODE_YWRAP;
1395         ops->update_start(info);
1396         scrollback_max -= count;
1397         if (scrollback_max < 0)
1398                 scrollback_max = 0;
1399         scrollback_current = 0;
1400 }
1401
1402 static __inline__ void ypan_up(struct vc_data *vc, int count)
1403 {
1404         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1405         struct display *p = &fb_display[vc->vc_num];
1406         struct fbcon_ops *ops = info->fbcon_par;
1407
1408         p->yscroll += count;
1409         if (p->yscroll > p->vrows - vc->vc_rows) {
1410                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1411                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1412                 p->yscroll -= p->vrows - vc->vc_rows;
1413         }
1414
1415         ops->var.xoffset = 0;
1416         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1417         ops->var.vmode &= ~FB_VMODE_YWRAP;
1418         ops->update_start(info);
1419         fbcon_clear_margins(vc, 1);
1420         scrollback_max += count;
1421         if (scrollback_max > scrollback_phys_max)
1422                 scrollback_max = scrollback_phys_max;
1423         scrollback_current = 0;
1424 }
1425
1426 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1427 {
1428         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1429         struct fbcon_ops *ops = info->fbcon_par;
1430         struct display *p = &fb_display[vc->vc_num];
1431
1432         p->yscroll += count;
1433
1434         if (p->yscroll > p->vrows - vc->vc_rows) {
1435                 p->yscroll -= p->vrows - vc->vc_rows;
1436                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1437         }
1438
1439         ops->var.xoffset = 0;
1440         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1441         ops->var.vmode &= ~FB_VMODE_YWRAP;
1442         ops->update_start(info);
1443         fbcon_clear_margins(vc, 1);
1444         scrollback_max += count;
1445         if (scrollback_max > scrollback_phys_max)
1446                 scrollback_max = scrollback_phys_max;
1447         scrollback_current = 0;
1448 }
1449
1450 static __inline__ void ypan_down(struct vc_data *vc, int count)
1451 {
1452         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1453         struct display *p = &fb_display[vc->vc_num];
1454         struct fbcon_ops *ops = info->fbcon_par;
1455
1456         p->yscroll -= count;
1457         if (p->yscroll < 0) {
1458                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1459                             0, vc->vc_rows, vc->vc_cols);
1460                 p->yscroll += p->vrows - vc->vc_rows;
1461         }
1462
1463         ops->var.xoffset = 0;
1464         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1465         ops->var.vmode &= ~FB_VMODE_YWRAP;
1466         ops->update_start(info);
1467         fbcon_clear_margins(vc, 1);
1468         scrollback_max -= count;
1469         if (scrollback_max < 0)
1470                 scrollback_max = 0;
1471         scrollback_current = 0;
1472 }
1473
1474 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1475 {
1476         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1477         struct fbcon_ops *ops = info->fbcon_par;
1478         struct display *p = &fb_display[vc->vc_num];
1479
1480         p->yscroll -= count;
1481
1482         if (p->yscroll < 0) {
1483                 p->yscroll += p->vrows - vc->vc_rows;
1484                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1485         }
1486
1487         ops->var.xoffset = 0;
1488         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1489         ops->var.vmode &= ~FB_VMODE_YWRAP;
1490         ops->update_start(info);
1491         fbcon_clear_margins(vc, 1);
1492         scrollback_max -= count;
1493         if (scrollback_max < 0)
1494                 scrollback_max = 0;
1495         scrollback_current = 0;
1496 }
1497
1498 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1499                                   long delta)
1500 {
1501         int count = vc->vc_rows;
1502         unsigned short *d, *s;
1503         unsigned long n;
1504         int line = 0;
1505
1506         d = (u16 *) softback_curr;
1507         if (d == (u16 *) softback_in)
1508                 d = (u16 *) vc->vc_origin;
1509         n = softback_curr + delta * vc->vc_size_row;
1510         softback_lines -= delta;
1511         if (delta < 0) {
1512                 if (softback_curr < softback_top && n < softback_buf) {
1513                         n += softback_end - softback_buf;
1514                         if (n < softback_top) {
1515                                 softback_lines -=
1516                                     (softback_top - n) / vc->vc_size_row;
1517                                 n = softback_top;
1518                         }
1519                 } else if (softback_curr >= softback_top
1520                            && n < softback_top) {
1521                         softback_lines -=
1522                             (softback_top - n) / vc->vc_size_row;
1523                         n = softback_top;
1524                 }
1525         } else {
1526                 if (softback_curr > softback_in && n >= softback_end) {
1527                         n += softback_buf - softback_end;
1528                         if (n > softback_in) {
1529                                 n = softback_in;
1530                                 softback_lines = 0;
1531                         }
1532                 } else if (softback_curr <= softback_in && n > softback_in) {
1533                         n = softback_in;
1534                         softback_lines = 0;
1535                 }
1536         }
1537         if (n == softback_curr)
1538                 return;
1539         softback_curr = n;
1540         s = (u16 *) softback_curr;
1541         if (s == (u16 *) softback_in)
1542                 s = (u16 *) vc->vc_origin;
1543         while (count--) {
1544                 unsigned short *start;
1545                 unsigned short *le;
1546                 unsigned short c;
1547                 int x = 0;
1548                 unsigned short attr = 1;
1549
1550                 start = s;
1551                 le = advance_row(s, 1);
1552                 do {
1553                         c = scr_readw(s);
1554                         if (attr != (c & 0xff00)) {
1555                                 attr = c & 0xff00;
1556                                 if (s > start) {
1557                                         fbcon_putcs(vc, start, s - start,
1558                                                     line, x);
1559                                         x += s - start;
1560                                         start = s;
1561                                 }
1562                         }
1563                         if (c == scr_readw(d)) {
1564                                 if (s > start) {
1565                                         fbcon_putcs(vc, start, s - start,
1566                                                     line, x);
1567                                         x += s - start + 1;
1568                                         start = s + 1;
1569                                 } else {
1570                                         x++;
1571                                         start++;
1572                                 }
1573                         }
1574                         s++;
1575                         d++;
1576                 } while (s < le);
1577                 if (s > start)
1578                         fbcon_putcs(vc, start, s - start, line, x);
1579                 line++;
1580                 if (d == (u16 *) softback_end)
1581                         d = (u16 *) softback_buf;
1582                 if (d == (u16 *) softback_in)
1583                         d = (u16 *) vc->vc_origin;
1584                 if (s == (u16 *) softback_end)
1585                         s = (u16 *) softback_buf;
1586                 if (s == (u16 *) softback_in)
1587                         s = (u16 *) vc->vc_origin;
1588         }
1589 }
1590
1591 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1592                               int line, int count, int dy)
1593 {
1594         unsigned short *s = (unsigned short *)
1595                 (vc->vc_origin + vc->vc_size_row * line);
1596
1597         while (count--) {
1598                 unsigned short *start = s;
1599                 unsigned short *le = advance_row(s, 1);
1600                 unsigned short c;
1601                 int x = 0;
1602                 unsigned short attr = 1;
1603
1604                 do {
1605                         c = scr_readw(s);
1606                         if (attr != (c & 0xff00)) {
1607                                 attr = c & 0xff00;
1608                                 if (s > start) {
1609                                         fbcon_putcs(vc, start, s - start,
1610                                                     dy, x);
1611                                         x += s - start;
1612                                         start = s;
1613                                 }
1614                         }
1615                         console_conditional_schedule();
1616                         s++;
1617                 } while (s < le);
1618                 if (s > start)
1619                         fbcon_putcs(vc, start, s - start, dy, x);
1620                 console_conditional_schedule();
1621                 dy++;
1622         }
1623 }
1624
1625 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1626                          int line, int count, int offset)
1627 {
1628         unsigned short *d = (unsigned short *)
1629             (vc->vc_origin + vc->vc_size_row * line);
1630         unsigned short *s = d + offset;
1631
1632         while (count--) {
1633                 unsigned short *start = s;
1634                 unsigned short *le = advance_row(s, 1);
1635                 unsigned short c;
1636                 int x = 0;
1637                 unsigned short attr = 1;
1638
1639                 do {
1640                         c = scr_readw(s);
1641                         if (attr != (c & 0xff00)) {
1642                                 attr = c & 0xff00;
1643                                 if (s > start) {
1644                                         fbcon_putcs(vc, start, s - start,
1645                                                     line, x);
1646                                         x += s - start;
1647                                         start = s;
1648                                 }
1649                         }
1650                         if (c == scr_readw(d)) {
1651                                 if (s > start) {
1652                                         fbcon_putcs(vc, start, s - start,
1653                                                      line, x);
1654                                         x += s - start + 1;
1655                                         start = s + 1;
1656                                 } else {
1657                                         x++;
1658                                         start++;
1659                                 }
1660                         }
1661                         scr_writew(c, d);
1662                         console_conditional_schedule();
1663                         s++;
1664                         d++;
1665                 } while (s < le);
1666                 if (s > start)
1667                         fbcon_putcs(vc, start, s - start, line, x);
1668                 console_conditional_schedule();
1669                 if (offset > 0)
1670                         line++;
1671                 else {
1672                         line--;
1673                         /* NOTE: We subtract two lines from these pointers */
1674                         s -= vc->vc_size_row;
1675                         d -= vc->vc_size_row;
1676                 }
1677         }
1678 }
1679
1680 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1681                                        int count)
1682 {
1683         unsigned short *p;
1684
1685         if (vc->vc_num != fg_console)
1686                 return;
1687         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1688
1689         while (count) {
1690                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1691                 count--;
1692                 p = advance_row(p, 1);
1693                 softback_in += vc->vc_size_row;
1694                 if (softback_in == softback_end)
1695                         softback_in = softback_buf;
1696                 if (softback_in == softback_top) {
1697                         softback_top += vc->vc_size_row;
1698                         if (softback_top == softback_end)
1699                                 softback_top = softback_buf;
1700                 }
1701         }
1702         softback_curr = softback_in;
1703 }
1704
1705 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1706                         int count)
1707 {
1708         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1709         struct display *p = &fb_display[vc->vc_num];
1710         struct fbcon_ops *ops = info->fbcon_par;
1711         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1712
1713         if (fbcon_is_inactive(vc, info))
1714                 return -EINVAL;
1715
1716         fbcon_cursor(vc, CM_ERASE);
1717
1718         /*
1719          * ++Geert: Only use ywrap/ypan if the console is in text mode
1720          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1721          *           whole screen (prevents flicker).
1722          */
1723
1724         switch (dir) {
1725         case SM_UP:
1726                 if (count > vc->vc_rows)        /* Maximum realistic size */
1727                         count = vc->vc_rows;
1728                 if (softback_top)
1729                         fbcon_softback_note(vc, t, count);
1730                 if (logo_shown >= 0)
1731                         goto redraw_up;
1732 #ifdef CONFIG_BOOTSPLASH
1733                 if (info->splash_data)
1734                         goto redraw_up;
1735 #endif
1736                 switch (p->scrollmode) {
1737                 case SCROLL_MOVE:
1738                         ops->bmove(vc, info, t + count, 0, t, 0,
1739                                     b - t - count, vc->vc_cols);
1740                         ops->clear(vc, info, b - count, 0, count,
1741                                   vc->vc_cols);
1742                         break;
1743
1744                 case SCROLL_WRAP_MOVE:
1745                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1746                                 if (t > 0)
1747                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1748                                                     vc->vc_cols);
1749                                 ywrap_up(vc, count);
1750                                 if (vc->vc_rows - b > 0)
1751                                         fbcon_bmove(vc, b - count, 0, b, 0,
1752                                                     vc->vc_rows - b,
1753                                                     vc->vc_cols);
1754                         } else if (info->flags & FBINFO_READS_FAST)
1755                                 fbcon_bmove(vc, t + count, 0, t, 0,
1756                                             b - t - count, vc->vc_cols);
1757                         else
1758                                 goto redraw_up;
1759                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1760                         break;
1761
1762                 case SCROLL_PAN_REDRAW:
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_redraw_move(vc, p, 0, t, count);
1771                                 ypan_up_redraw(vc, t, count);
1772                                 if (vc->vc_rows - b > 0)
1773                                         fbcon_redraw_move(vc, p, b,
1774                                                           vc->vc_rows - b, b);
1775                         } else
1776                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1777                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1778                         break;
1779
1780                 case SCROLL_PAN_MOVE:
1781                         if ((p->yscroll + count <=
1782                              2 * (p->vrows - vc->vc_rows))
1783                             && ((!scroll_partial && (b - t == vc->vc_rows))
1784                                 || (scroll_partial
1785                                     && (b - t - count >
1786                                         3 * vc->vc_rows >> 2)))) {
1787                                 if (t > 0)
1788                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1789                                                     vc->vc_cols);
1790                                 ypan_up(vc, count);
1791                                 if (vc->vc_rows - b > 0)
1792                                         fbcon_bmove(vc, b - count, 0, b, 0,
1793                                                     vc->vc_rows - b,
1794                                                     vc->vc_cols);
1795                         } else if (info->flags & FBINFO_READS_FAST)
1796                                 fbcon_bmove(vc, t + count, 0, t, 0,
1797                                             b - t - count, vc->vc_cols);
1798                         else
1799                                 goto redraw_up;
1800                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1801                         break;
1802
1803                 case SCROLL_REDRAW:
1804                       redraw_up:
1805                         fbcon_redraw(vc, p, t, b - t - count,
1806                                      count * vc->vc_cols);
1807                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1808                         scr_memsetw((unsigned short *) (vc->vc_origin +
1809                                                         vc->vc_size_row *
1810                                                         (b - count)),
1811                                     vc->vc_video_erase_char,
1812                                     vc->vc_size_row * count);
1813                         return 1;
1814                 }
1815                 break;
1816
1817         case SM_DOWN:
1818                 if (count > vc->vc_rows)        /* Maximum realistic size */
1819                         count = vc->vc_rows;
1820                 if (logo_shown >= 0)
1821                         goto redraw_down;
1822 #ifdef CONFIG_BOOTSPLASH
1823                 if (info->splash_data)
1824                         goto redraw_down;
1825 #endif
1826                 switch (p->scrollmode) {
1827                 case SCROLL_MOVE:
1828                         ops->bmove(vc, info, t, 0, t + count, 0,
1829                                     b - t - count, vc->vc_cols);
1830                         ops->clear(vc, info, t, 0, count, vc->vc_cols);
1831                         break;
1832
1833                 case SCROLL_WRAP_MOVE:
1834                         if (b - t - count > 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                                 ywrap_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_MOVE:
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_bmove(vc, b, 0, b - count, 0,
1859                                                     vc->vc_rows - b,
1860                                                     vc->vc_cols);
1861                                 ypan_down(vc, count);
1862                                 if (t > 0)
1863                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1864                                                     vc->vc_cols);
1865                         } else if (info->flags & FBINFO_READS_FAST)
1866                                 fbcon_bmove(vc, t, 0, t + count, 0,
1867                                             b - t - count, vc->vc_cols);
1868                         else
1869                                 goto redraw_down;
1870                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1871                         break;
1872
1873                 case SCROLL_PAN_REDRAW:
1874                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1875                             && ((!scroll_partial && (b - t == vc->vc_rows))
1876                                 || (scroll_partial
1877                                     && (b - t - count >
1878                                         3 * vc->vc_rows >> 2)))) {
1879                                 if (vc->vc_rows - b > 0)
1880                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1881                                                           b - count);
1882                                 ypan_down_redraw(vc, t, count);
1883                                 if (t > 0)
1884                                         fbcon_redraw_move(vc, p, count, t, 0);
1885                         } else
1886                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1887                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1888                         break;
1889
1890                 case SCROLL_REDRAW:
1891                       redraw_down:
1892                         fbcon_redraw(vc, p, b - 1, b - t - count,
1893                                      -count * vc->vc_cols);
1894                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1895                         scr_memsetw((unsigned short *) (vc->vc_origin +
1896                                                         vc->vc_size_row *
1897                                                         t),
1898                                     vc->vc_video_erase_char,
1899                                     vc->vc_size_row * count);
1900                         return 1;
1901                 }
1902         }
1903         return 0;
1904 }
1905
1906
1907 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1908                         int height, int width)
1909 {
1910         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1911         struct display *p = &fb_display[vc->vc_num];
1912
1913         if (fbcon_is_inactive(vc, info))
1914                 return;
1915
1916         if (!width || !height)
1917                 return;
1918
1919         /*  Split blits that cross physical y_wrap case.
1920          *  Pathological case involves 4 blits, better to use recursive
1921          *  code rather than unrolled case
1922          *
1923          *  Recursive invocations don't need to erase the cursor over and
1924          *  over again, so we use fbcon_bmove_rec()
1925          */
1926         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1927                         p->vrows - p->yscroll);
1928 }
1929
1930 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
1931                             int dy, int dx, int height, int width, u_int y_break)
1932 {
1933         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1934         struct fbcon_ops *ops = info->fbcon_par;
1935         u_int b;
1936
1937         if (sy < y_break && sy + height > y_break) {
1938                 b = y_break - sy;
1939                 if (dy < sy) {  /* Avoid trashing self */
1940                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1941                                         y_break);
1942                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1943                                         height - b, width, y_break);
1944                 } else {
1945                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1946                                         height - b, width, y_break);
1947                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1948                                         y_break);
1949                 }
1950                 return;
1951         }
1952
1953         if (dy < y_break && dy + height > y_break) {
1954                 b = y_break - dy;
1955                 if (dy < sy) {  /* Avoid trashing self */
1956                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1957                                         y_break);
1958                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1959                                         height - b, width, y_break);
1960                 } else {
1961                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1962                                         height - b, width, y_break);
1963                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1964                                         y_break);
1965                 }
1966                 return;
1967         }
1968
1969 #ifdef CONFIG_BOOTSPLASH
1970         if (info->splash_data && sy == dy && height == 1) {
1971                 /* must use slower redraw bmove to keep background pic intact */
1972                 splash_bmove_redraw(info->splash_data, vc, info, sy, sx, dx, width);
1973                 return;
1974         }
1975 #endif
1976         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1977                    height, width);
1978 }
1979
1980 static __inline__ void updatescrollmode(struct display *p,
1981                                         struct fb_info *info,
1982                                         struct vc_data *vc)
1983 {
1984         struct fbcon_ops *ops = info->fbcon_par;
1985         int fh = vc->vc_font.height;
1986         int cap = info->flags;
1987         u16 t = 0;
1988         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
1989                                   info->fix.xpanstep);
1990         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
1991         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1992         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
1993                                    info->var.xres_virtual);
1994         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
1995                 divides(ypan, vc->vc_font.height) && vyres > yres;
1996         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
1997                 divides(ywrap, vc->vc_font.height) &&
1998                 divides(vc->vc_font.height, vyres) &&
1999                 divides(vc->vc_font.height, yres);
2000         int reading_fast = cap & FBINFO_READS_FAST;
2001         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
2002                 !(cap & FBINFO_HWACCEL_DISABLED);
2003         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
2004                 !(cap & FBINFO_HWACCEL_DISABLED);
2005
2006         p->vrows = vyres/fh;
2007         if (yres > (fh * (vc->vc_rows + 1)))
2008                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
2009         if ((yres % fh) && (vyres % fh < yres % fh))
2010                 p->vrows--;
2011
2012         if (good_wrap || good_pan) {
2013                 if (reading_fast || fast_copyarea)
2014                         p->scrollmode = good_wrap ?
2015                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
2016                 else
2017                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
2018                                 SCROLL_PAN_REDRAW;
2019         } else {
2020                 if (reading_fast || (fast_copyarea && !fast_imageblit))
2021                         p->scrollmode = SCROLL_MOVE;
2022                 else
2023                         p->scrollmode = SCROLL_REDRAW;
2024         }
2025 }
2026
2027 static int fbcon_resize(struct vc_data *vc, unsigned int width,
2028                         unsigned int height)
2029 {
2030         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2031         struct fbcon_ops *ops = info->fbcon_par;
2032         struct display *p = &fb_display[vc->vc_num];
2033         struct fb_var_screeninfo var = info->var;
2034         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2035
2036         virt_w = FBCON_SWAP(ops->rotate, width, height);
2037         virt_h = FBCON_SWAP(ops->rotate, height, width);
2038         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2039                                  vc->vc_font.height);
2040         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2041                                  vc->vc_font.width);
2042         var.xres = virt_w * virt_fw;
2043         var.yres = virt_h * virt_fh;
2044         x_diff = info->var.xres - var.xres;
2045         y_diff = info->var.yres - var.yres;
2046         if (x_diff < 0 || x_diff > virt_fw ||
2047             y_diff < 0 || y_diff > virt_fh) {
2048                 struct fb_videomode *mode;
2049
2050                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2051                 mode = fb_find_best_mode(&var, &info->modelist);
2052                 if (mode == NULL)
2053                         return -EINVAL;
2054                 display_to_var(&var, p);
2055                 fb_videomode_to_var(&var, mode);
2056
2057                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2058                         return -EINVAL;
2059
2060                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2061                 if (CON_IS_VISIBLE(vc)) {
2062                         var.activate = FB_ACTIVATE_NOW |
2063                                 FB_ACTIVATE_FORCE;
2064                         fb_set_var(info, &var);
2065                 }
2066                 var_to_display(p, &info->var, info);
2067                 ops->var = info->var;
2068         }
2069         updatescrollmode(p, info, vc);
2070         return 0;
2071 }
2072
2073 static int fbcon_switch(struct vc_data *vc)
2074 {
2075         struct fb_info *info, *old_info = NULL;
2076         struct fbcon_ops *ops;
2077         struct display *p = &fb_display[vc->vc_num];
2078         struct fb_var_screeninfo var;
2079         int i, prev_console, charcnt = 256;
2080
2081         info = registered_fb[con2fb_map[vc->vc_num]];
2082         ops = info->fbcon_par;
2083
2084 #ifdef CONFIG_BOOTSPLASH
2085         splash_prepare(vc, info);
2086 #endif
2087
2088         if (softback_top) {
2089                 if (softback_lines)
2090                         fbcon_set_origin(vc);
2091                 softback_top = softback_curr = softback_in = softback_buf;
2092                 softback_lines = 0;
2093                 fbcon_update_softback(vc);
2094         }
2095
2096         if (logo_shown >= 0) {
2097                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2098
2099                 if (conp2->vc_top == logo_lines
2100                     && conp2->vc_bottom == conp2->vc_rows)
2101                         conp2->vc_top = 0;
2102                 logo_shown = FBCON_LOGO_CANSHOW;
2103         }
2104
2105         prev_console = ops->currcon;
2106         if (prev_console != -1)
2107                 old_info = registered_fb[con2fb_map[prev_console]];
2108         /*
2109          * FIXME: If we have multiple fbdev's loaded, we need to
2110          * update all info->currcon.  Perhaps, we can place this
2111          * in a centralized structure, but this might break some
2112          * drivers.
2113          *
2114          * info->currcon = vc->vc_num;
2115          */
2116         for (i = 0; i < FB_MAX; i++) {
2117                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2118                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2119
2120                         o->currcon = vc->vc_num;
2121                 }
2122         }
2123         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2124         display_to_var(&var, p);
2125         var.activate = FB_ACTIVATE_NOW;
2126
2127         /*
2128          * make sure we don't unnecessarily trip the memcmp()
2129          * in fb_set_var()
2130          */
2131         info->var.activate = var.activate;
2132         var.yoffset = info->var.yoffset;
2133         var.xoffset = info->var.xoffset;
2134         var.vmode = info->var.vmode;
2135         fb_set_var(info, &var);
2136         ops->var = info->var;
2137
2138         if (old_info != NULL && (old_info != info ||
2139                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2140                 if (info->fbops->fb_set_par)
2141                         info->fbops->fb_set_par(info);
2142
2143                 if (old_info != info) {
2144                         fbcon_del_cursor_timer(old_info);
2145                         fbcon_add_cursor_timer(info);
2146                 }
2147         }
2148
2149         set_blitting_type(vc, info);
2150         ops->cursor_reset = 1;
2151
2152         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2153                 ops->rotate = FB_ROTATE_UR;
2154                 set_blitting_type(vc, info);
2155         }
2156
2157         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2158         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2159
2160         if (p->userfont)
2161                 charcnt = FNTCHARCNT(vc->vc_font.data);
2162
2163         if (charcnt > 256)
2164                 vc->vc_complement_mask <<= 1;
2165
2166         updatescrollmode(p, info, vc);
2167
2168         switch (p->scrollmode) {
2169         case SCROLL_WRAP_MOVE:
2170                 scrollback_phys_max = p->vrows - vc->vc_rows;
2171                 break;
2172         case SCROLL_PAN_MOVE:
2173         case SCROLL_PAN_REDRAW:
2174                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2175                 if (scrollback_phys_max < 0)
2176                         scrollback_phys_max = 0;
2177                 break;
2178         default:
2179                 scrollback_phys_max = 0;
2180                 break;
2181         }
2182
2183         scrollback_max = 0;
2184         scrollback_current = 0;
2185
2186         if (!fbcon_is_inactive(vc, info)) {
2187             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2188             ops->update_start(info);
2189         }
2190
2191         fbcon_set_palette(vc, color_table);
2192         fbcon_clear_margins(vc, 0);
2193
2194         if (logo_shown == FBCON_LOGO_DRAW) {
2195
2196                 logo_shown = fg_console;
2197                 /* This is protected above by initmem_freed */
2198                 fb_show_logo(info, ops->rotate);
2199                 update_region(vc,
2200                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2201                               vc->vc_size_row * (vc->vc_bottom -
2202                                                  vc->vc_top) / 2);
2203                 return 0;
2204         }
2205         return 1;
2206 }
2207
2208 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2209                                 int blank)
2210 {
2211 #ifdef CONFIG_BOOTSPLASH
2212         if (info->splash_data) {
2213                 splash_blank(info->splash_data, vc, info, blank);
2214                 return;
2215         }
2216 #endif
2217         if (blank) {
2218                 unsigned short charmask = vc->vc_hi_font_mask ?
2219                         0x1ff : 0xff;
2220                 unsigned short oldc;
2221
2222                 oldc = vc->vc_video_erase_char;
2223                 vc->vc_video_erase_char &= charmask;
2224                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2225                 vc->vc_video_erase_char = oldc;
2226         }
2227 }
2228
2229 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2230 {
2231         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2232         struct fbcon_ops *ops = info->fbcon_par;
2233
2234         if (mode_switch) {
2235                 struct fb_var_screeninfo var = info->var;
2236
2237                 ops->graphics = 1;
2238
2239                 if (!blank) {
2240                         if (info->fbops->fb_save_state)
2241                                 info->fbops->fb_save_state(info);
2242                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2243                         fb_set_var(info, &var);
2244                         ops->graphics = 0;
2245                         ops->var = info->var;
2246                 } else if (info->fbops->fb_restore_state)
2247                         info->fbops->fb_restore_state(info);
2248         }
2249
2250         if (!fbcon_is_inactive(vc, info)) {
2251                 if (ops->blank_state != blank) {
2252                         ops->blank_state = blank;
2253                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2254                         ops->cursor_flash = (!blank);
2255
2256                         if (fb_blank(info, blank))
2257                                 fbcon_generic_blank(vc, info, blank);
2258                 }
2259
2260                 if (!blank)
2261                         update_screen(vc);
2262         }
2263
2264         if (!blank)
2265                 fbcon_add_cursor_timer(info);
2266         else
2267                 fbcon_del_cursor_timer(info);
2268
2269         return 0;
2270 }
2271
2272 static void fbcon_free_font(struct display *p)
2273 {
2274         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
2275                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
2276         p->fontdata = NULL;
2277         p->userfont = 0;
2278 }
2279
2280 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2281 {
2282         u8 *fontdata = vc->vc_font.data;
2283         u8 *data = font->data;
2284         int i, j;
2285
2286         font->width = vc->vc_font.width;
2287         font->height = vc->vc_font.height;
2288         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2289         if (!font->data)
2290                 return 0;
2291
2292         if (font->width <= 8) {
2293                 j = vc->vc_font.height;
2294                 for (i = 0; i < font->charcount; i++) {
2295                         memcpy(data, fontdata, j);
2296                         memset(data + j, 0, 32 - j);
2297                         data += 32;
2298                         fontdata += j;
2299                 }
2300         } else if (font->width <= 16) {
2301                 j = vc->vc_font.height * 2;
2302                 for (i = 0; i < font->charcount; i++) {
2303                         memcpy(data, fontdata, j);
2304                         memset(data + j, 0, 64 - j);
2305                         data += 64;
2306                         fontdata += j;
2307                 }
2308         } else if (font->width <= 24) {
2309                 for (i = 0; i < font->charcount; i++) {
2310                         for (j = 0; j < vc->vc_font.height; j++) {
2311                                 *data++ = fontdata[0];
2312                                 *data++ = fontdata[1];
2313                                 *data++ = fontdata[2];
2314                                 fontdata += sizeof(u32);
2315                         }
2316                         memset(data, 0, 3 * (32 - j));
2317                         data += 3 * (32 - j);
2318                 }
2319         } else {
2320                 j = vc->vc_font.height * 4;
2321                 for (i = 0; i < font->charcount; i++) {
2322                         memcpy(data, fontdata, j);
2323                         memset(data + j, 0, 128 - j);
2324                         data += 128;
2325                         fontdata += j;
2326                 }
2327         }
2328         return 0;
2329 }
2330
2331 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2332                              const u8 * data, int userfont)
2333 {
2334         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2335         struct fbcon_ops *ops = info->fbcon_par;
2336         struct display *p = &fb_display[vc->vc_num];
2337         int resize;
2338         int cnt;
2339         char *old_data = NULL;
2340
2341         if (CON_IS_VISIBLE(vc) && softback_lines)
2342                 fbcon_set_origin(vc);
2343
2344         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2345         if (p->userfont)
2346                 old_data = vc->vc_font.data;
2347         if (userfont)
2348                 cnt = FNTCHARCNT(data);
2349         else
2350                 cnt = 256;
2351         vc->vc_font.data = (void *)(p->fontdata = data);
2352         if ((p->userfont = userfont))
2353                 REFCOUNT(data)++;
2354         vc->vc_font.width = w;
2355         vc->vc_font.height = h;
2356         if (vc->vc_hi_font_mask && cnt == 256) {
2357                 vc->vc_hi_font_mask = 0;
2358                 if (vc->vc_can_do_color) {
2359                         vc->vc_complement_mask >>= 1;
2360                         vc->vc_s_complement_mask >>= 1;
2361                 }
2362
2363                 /* ++Edmund: reorder the attribute bits */
2364                 if (vc->vc_can_do_color) {
2365                         unsigned short *cp =
2366                             (unsigned short *) vc->vc_origin;
2367                         int count = vc->vc_screenbuf_size / 2;
2368                         unsigned short c;
2369                         for (; count > 0; count--, cp++) {
2370                                 c = scr_readw(cp);
2371                                 scr_writew(((c & 0xfe00) >> 1) |
2372                                            (c & 0xff), cp);
2373                         }
2374                         c = vc->vc_video_erase_char;
2375                         vc->vc_video_erase_char =
2376                             ((c & 0xfe00) >> 1) | (c & 0xff);
2377                         vc->vc_attr >>= 1;
2378                 }
2379         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2380                 vc->vc_hi_font_mask = 0x100;
2381                 if (vc->vc_can_do_color) {
2382                         vc->vc_complement_mask <<= 1;
2383                         vc->vc_s_complement_mask <<= 1;
2384                 }
2385
2386                 /* ++Edmund: reorder the attribute bits */
2387                 {
2388                         unsigned short *cp =
2389                             (unsigned short *) vc->vc_origin;
2390                         int count = vc->vc_screenbuf_size / 2;
2391                         unsigned short c;
2392                         for (; count > 0; count--, cp++) {
2393                                 unsigned short newc;
2394                                 c = scr_readw(cp);
2395                                 if (vc->vc_can_do_color)
2396                                         newc =
2397                                             ((c & 0xff00) << 1) | (c &
2398                                                                    0xff);
2399                                 else
2400                                         newc = c & ~0x100;
2401                                 scr_writew(newc, cp);
2402                         }
2403                         c = vc->vc_video_erase_char;
2404                         if (vc->vc_can_do_color) {
2405                                 vc->vc_video_erase_char =
2406                                     ((c & 0xff00) << 1) | (c & 0xff);
2407                                 vc->vc_attr <<= 1;
2408                         } else
2409                                 vc->vc_video_erase_char = c & ~0x100;
2410                 }
2411
2412         }
2413
2414         if (resize) {
2415                 int cols, rows;
2416
2417                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2418                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2419 #ifdef CONFIG_BOOTSPLASH
2420                 if (info->splash_data) {
2421                         cols = info->splash_data->splash_text_wi;
2422                         rows = info->splash_data->splash_text_he;
2423                 }
2424 #endif
2425                 cols /= w;
2426                 rows /= h;
2427                 vc_resize(vc, cols, rows);
2428                 if (CON_IS_VISIBLE(vc) && softback_buf)
2429                         fbcon_update_softback(vc);
2430         } else if (CON_IS_VISIBLE(vc)
2431                    && vc->vc_mode == KD_TEXT) {
2432                 fbcon_clear_margins(vc, 0);
2433                 update_screen(vc);
2434         }
2435
2436         if (old_data && (--REFCOUNT(old_data) == 0))
2437                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2438         return 0;
2439 }
2440
2441 static int fbcon_copy_font(struct vc_data *vc, int con)
2442 {
2443         struct display *od = &fb_display[con];
2444         struct console_font *f = &vc->vc_font;
2445
2446         if (od->fontdata == f->data)
2447                 return 0;       /* already the same font... */
2448         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2449 }
2450
2451 /*
2452  *  User asked to set font; we are guaranteed that
2453  *      a) width and height are in range 1..32
2454  *      b) charcount does not exceed 512
2455  *  but lets not assume that, since someone might someday want to use larger
2456  *  fonts. And charcount of 512 is small for unicode support.
2457  *
2458  *  However, user space gives the font in 32 rows , regardless of
2459  *  actual font height. So a new API is needed if support for larger fonts
2460  *  is ever implemented.
2461  */
2462
2463 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2464 {
2465         unsigned charcount = font->charcount;
2466         int w = font->width;
2467         int h = font->height;
2468         int size;
2469         int i, csum;
2470         u8 *new_data, *data = font->data;
2471         int pitch = (font->width+7) >> 3;
2472
2473         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2474          * If not this check should be changed to charcount < 256 */
2475         if (charcount != 256 && charcount != 512)
2476                 return -EINVAL;
2477
2478         size = h * pitch * charcount;
2479
2480         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2481
2482         if (!new_data)
2483                 return -ENOMEM;
2484
2485         new_data += FONT_EXTRA_WORDS * sizeof(int);
2486         FNTSIZE(new_data) = size;
2487         FNTCHARCNT(new_data) = charcount;
2488         REFCOUNT(new_data) = 0; /* usage counter */
2489         for (i=0; i< charcount; i++) {
2490                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2491         }
2492
2493         /* Since linux has a nice crc32 function use it for counting font
2494          * checksums. */
2495         csum = crc32(0, new_data, size);
2496
2497         FNTSUM(new_data) = csum;
2498         /* Check if the same font is on some other console already */
2499         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2500                 struct vc_data *tmp = vc_cons[i].d;
2501
2502                 if (fb_display[i].userfont &&
2503                     fb_display[i].fontdata &&
2504                     FNTSUM(fb_display[i].fontdata) == csum &&
2505                     FNTSIZE(fb_display[i].fontdata) == size &&
2506                     tmp->vc_font.width == w &&
2507                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2508                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2509                         new_data = (u8 *)fb_display[i].fontdata;
2510                         break;
2511                 }
2512         }
2513         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2514 }
2515
2516 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2517 {
2518         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2519         const struct font_desc *f;
2520
2521         if (!name)
2522                 f = get_default_font(info->var.xres, info->var.yres);
2523         else if (!(f = find_font(name)))
2524                 return -ENOENT;
2525
2526         font->width = f->width;
2527         font->height = f->height;
2528         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2529 }
2530
2531 static u16 palette_red[16];
2532 static u16 palette_green[16];
2533 static u16 palette_blue[16];
2534
2535 static struct fb_cmap palette_cmap = {
2536         0, 16, palette_red, palette_green, palette_blue, NULL
2537 };
2538
2539 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
2540 {
2541         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2542         int i, j, k, depth;
2543         u8 val;
2544
2545         if (fbcon_is_inactive(vc, info))
2546                 return -EINVAL;
2547
2548         if (!CON_IS_VISIBLE(vc))
2549                 return 0;
2550
2551         depth = fb_get_color_depth(&info->var, &info->fix);
2552         if (depth > 3) {
2553                 for (i = j = 0; i < 16; i++) {
2554                         k = table[i];
2555                         val = vc->vc_palette[j++];
2556                         palette_red[k] = (val << 8) | val;
2557                         val = vc->vc_palette[j++];
2558                         palette_green[k] = (val << 8) | val;
2559                         val = vc->vc_palette[j++];
2560                         palette_blue[k] = (val << 8) | val;
2561                 }
2562                 palette_cmap.len = 16;
2563                 palette_cmap.start = 0;
2564         /*
2565          * If framebuffer is capable of less than 16 colors,
2566          * use default palette of fbcon.
2567          */
2568         } else
2569                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2570
2571         return fb_set_cmap(&palette_cmap, info);
2572 }
2573
2574 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2575 {
2576         unsigned long p;
2577         int line;
2578
2579         if (vc->vc_num != fg_console || !softback_lines)
2580                 return (u16 *) (vc->vc_origin + offset);
2581         line = offset / vc->vc_size_row;
2582         if (line >= softback_lines)
2583                 return (u16 *) (vc->vc_origin + offset -
2584                                 softback_lines * vc->vc_size_row);
2585         p = softback_curr + offset;
2586         if (p >= softback_end)
2587                 p += softback_buf - softback_end;
2588         return (u16 *) p;
2589 }
2590
2591 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2592                                  int *px, int *py)
2593 {
2594         unsigned long ret;
2595         int x, y;
2596
2597         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2598                 unsigned long offset = (pos - vc->vc_origin) / 2;
2599
2600                 x = offset % vc->vc_cols;
2601                 y = offset / vc->vc_cols;
2602                 if (vc->vc_num == fg_console)
2603                         y += softback_lines;
2604                 ret = pos + (vc->vc_cols - x) * 2;
2605         } else if (vc->vc_num == fg_console && softback_lines) {
2606                 unsigned long offset = pos - softback_curr;
2607
2608                 if (pos < softback_curr)
2609                         offset += softback_end - softback_buf;
2610                 offset /= 2;
2611                 x = offset % vc->vc_cols;
2612                 y = offset / vc->vc_cols;
2613                 ret = pos + (vc->vc_cols - x) * 2;
2614                 if (ret == softback_end)
2615                         ret = softback_buf;
2616                 if (ret == softback_in)
2617                         ret = vc->vc_origin;
2618         } else {
2619                 /* Should not happen */
2620                 x = y = 0;
2621                 ret = vc->vc_origin;
2622         }
2623         if (px)
2624                 *px = x;
2625         if (py)
2626                 *py = y;
2627         return ret;
2628 }
2629
2630 /* As we might be inside of softback, we may work with non-contiguous buffer,
2631    that's why we have to use a separate routine. */
2632 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2633 {
2634         while (cnt--) {
2635                 u16 a = scr_readw(p);
2636                 if (!vc->vc_can_do_color)
2637                         a ^= 0x0800;
2638                 else if (vc->vc_hi_font_mask == 0x100)
2639                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2640                             (((a) & 0x0e00) << 4);
2641                 else
2642                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2643                             (((a) & 0x0700) << 4);
2644                 scr_writew(a, p++);
2645                 if (p == (u16 *) softback_end)
2646                         p = (u16 *) softback_buf;
2647                 if (p == (u16 *) softback_in)
2648                         p = (u16 *) vc->vc_origin;
2649         }
2650 }
2651
2652 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
2653 {
2654         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2655         struct fbcon_ops *ops = info->fbcon_par;
2656         struct display *p = &fb_display[fg_console];
2657         int offset, limit, scrollback_old;
2658
2659         if (softback_top) {
2660                 if (vc->vc_num != fg_console)
2661                         return 0;
2662                 if (vc->vc_mode != KD_TEXT || !lines)
2663                         return 0;
2664                 if (logo_shown >= 0) {
2665                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2666
2667                         if (conp2->vc_top == logo_lines
2668                             && conp2->vc_bottom == conp2->vc_rows)
2669                                 conp2->vc_top = 0;
2670                         if (logo_shown == vc->vc_num) {
2671                                 unsigned long p, q;
2672                                 int i;
2673
2674                                 p = softback_in;
2675                                 q = vc->vc_origin +
2676                                     logo_lines * vc->vc_size_row;
2677                                 for (i = 0; i < logo_lines; i++) {
2678                                         if (p == softback_top)
2679                                                 break;
2680                                         if (p == softback_buf)
2681                                                 p = softback_end;
2682                                         p -= vc->vc_size_row;
2683                                         q -= vc->vc_size_row;
2684                                         scr_memcpyw((u16 *) q, (u16 *) p,
2685                                                     vc->vc_size_row);
2686                                 }
2687                                 softback_in = softback_curr = p;
2688                                 update_region(vc, vc->vc_origin,
2689                                               logo_lines * vc->vc_cols);
2690                         }
2691                         logo_shown = FBCON_LOGO_CANSHOW;
2692                 }
2693                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2694                 fbcon_redraw_softback(vc, p, lines);
2695                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2696                 return 0;
2697         }
2698
2699         if (!scrollback_phys_max)
2700                 return -ENOSYS;
2701
2702         scrollback_old = scrollback_current;
2703         scrollback_current -= lines;
2704         if (scrollback_current < 0)
2705                 scrollback_current = 0;
2706         else if (scrollback_current > scrollback_max)
2707                 scrollback_current = scrollback_max;
2708         if (scrollback_current == scrollback_old)
2709                 return 0;
2710
2711         if (fbcon_is_inactive(vc, info))
2712                 return 0;
2713
2714         fbcon_cursor(vc, CM_ERASE);
2715
2716         offset = p->yscroll - scrollback_current;
2717         limit = p->vrows;
2718         switch (p->scrollmode) {
2719         case SCROLL_WRAP_MOVE:
2720                 info->var.vmode |= FB_VMODE_YWRAP;
2721                 break;
2722         case SCROLL_PAN_MOVE:
2723         case SCROLL_PAN_REDRAW:
2724                 limit -= vc->vc_rows;
2725                 info->var.vmode &= ~FB_VMODE_YWRAP;
2726                 break;
2727         }
2728         if (offset < 0)
2729                 offset += limit;
2730         else if (offset >= limit)
2731                 offset -= limit;
2732
2733         ops->var.xoffset = 0;
2734         ops->var.yoffset = offset * vc->vc_font.height;
2735         ops->update_start(info);
2736
2737         if (!scrollback_current)
2738                 fbcon_cursor(vc, CM_DRAW);
2739         return 0;
2740 }
2741
2742 static int fbcon_set_origin(struct vc_data *vc)
2743 {
2744         if (softback_lines)
2745                 fbcon_scrolldelta(vc, softback_lines);
2746         return 0;
2747 }
2748
2749 static void fbcon_suspended(struct fb_info *info)
2750 {
2751         struct vc_data *vc = NULL;
2752         struct fbcon_ops *ops = info->fbcon_par;
2753
2754         if (!ops || ops->currcon < 0)
2755                 return;
2756         vc = vc_cons[ops->currcon].d;
2757
2758         /* Clear cursor, restore saved data */
2759         fbcon_cursor(vc, CM_ERASE);
2760 }
2761
2762 static void fbcon_resumed(struct fb_info *info)
2763 {
2764         struct vc_data *vc;
2765         struct fbcon_ops *ops = info->fbcon_par;
2766
2767         if (!ops || ops->currcon < 0)
2768                 return;
2769         vc = vc_cons[ops->currcon].d;
2770
2771         update_screen(vc);
2772 }
2773
2774 static void fbcon_modechanged(struct fb_info *info)
2775 {
2776         struct fbcon_ops *ops = info->fbcon_par;
2777         struct vc_data *vc;
2778         struct display *p;
2779         int rows, cols;
2780
2781         if (!ops || ops->currcon < 0)
2782                 return;
2783         vc = vc_cons[ops->currcon].d;
2784         if (vc->vc_mode != KD_TEXT ||
2785             registered_fb[con2fb_map[ops->currcon]] != info)
2786                 return;
2787
2788         p = &fb_display[vc->vc_num];
2789         set_blitting_type(vc, info);
2790
2791         if (CON_IS_VISIBLE(vc)) {
2792                 var_to_display(p, &info->var, info);
2793                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2794                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2795                 cols /= vc->vc_font.width;
2796                 rows /= vc->vc_font.height;
2797                 vc_resize(vc, cols, rows);
2798                 updatescrollmode(p, info, vc);
2799                 scrollback_max = 0;
2800                 scrollback_current = 0;
2801
2802                 if (!fbcon_is_inactive(vc, info)) {
2803                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2804                     ops->update_start(info);
2805                 }
2806
2807                 fbcon_set_palette(vc, color_table);
2808                 update_screen(vc);
2809                 if (softback_buf)
2810                         fbcon_update_softback(vc);
2811         }
2812 }
2813
2814 static void fbcon_set_all_vcs(struct fb_info *info)
2815 {
2816         struct fbcon_ops *ops = info->fbcon_par;
2817         struct vc_data *vc;
2818         struct display *p;
2819         int i, rows, cols;
2820
2821         if (!ops || ops->currcon < 0)
2822                 return;
2823
2824         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2825                 vc = vc_cons[i].d;
2826                 if (!vc || vc->vc_mode != KD_TEXT ||
2827                     registered_fb[con2fb_map[i]] != info)
2828                         continue;
2829
2830                 p = &fb_display[vc->vc_num];
2831                 set_blitting_type(vc, info);
2832                 var_to_display(p, &info->var, info);
2833                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2834                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2835                 cols /= vc->vc_font.width;
2836                 rows /= vc->vc_font.height;
2837                 vc_resize(vc, cols, rows);
2838
2839                 if (CON_IS_VISIBLE(vc)) {
2840                         updatescrollmode(p, info, vc);
2841                         scrollback_max = 0;
2842                         scrollback_current = 0;
2843
2844                         if (!fbcon_is_inactive(vc, info)) {
2845                             ops->var.xoffset = ops->var.yoffset =
2846                                 p->yscroll = 0;
2847                             ops->update_start(info);
2848                         }
2849
2850                         fbcon_set_palette(vc, color_table);
2851                         update_screen(vc);
2852                         if (softback_buf)
2853                                 fbcon_update_softback(vc);
2854                 }
2855         }
2856
2857         ops->p = &fb_display[ops->currcon];
2858 }
2859
2860 static int fbcon_mode_deleted(struct fb_info *info,
2861                               struct fb_videomode *mode)
2862 {
2863         struct fb_info *fb_info;
2864         struct display *p;
2865         int i, j, found = 0;
2866
2867         /* before deletion, ensure that mode is not in use */
2868         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2869                 j = con2fb_map[i];
2870                 if (j == -1)
2871                         continue;
2872                 fb_info = registered_fb[j];
2873                 if (fb_info != info)
2874                         continue;
2875                 p = &fb_display[i];
2876                 if (!p || !p->mode)
2877                         continue;
2878                 if (fb_mode_is_equal(p->mode, mode)) {
2879                         found = 1;
2880                         break;
2881                 }
2882         }
2883         return found;
2884 }
2885
2886 static int fbcon_fb_registered(int idx)
2887 {
2888         int ret = 0, i;
2889
2890         if (info_idx == -1) {
2891                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2892                         if (con2fb_map_boot[i] == idx) {
2893                                 info_idx = idx;
2894                                 break;
2895                         }
2896                 }
2897                 if (info_idx != -1)
2898                         ret = fbcon_takeover(1);
2899         } else {
2900                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2901                         if (con2fb_map_boot[i] == idx)
2902                                 set_con2fb_map(i, idx, 0);
2903                 }
2904         }
2905
2906         return ret;
2907 }
2908
2909 static void fbcon_fb_blanked(struct fb_info *info, int blank)
2910 {
2911         struct fbcon_ops *ops = info->fbcon_par;
2912         struct vc_data *vc;
2913
2914         if (!ops || ops->currcon < 0)
2915                 return;
2916
2917         vc = vc_cons[ops->currcon].d;
2918         if (vc->vc_mode != KD_TEXT ||
2919                         registered_fb[con2fb_map[ops->currcon]] != info)
2920                 return;
2921
2922         if (CON_IS_VISIBLE(vc)) {
2923                 if (blank)
2924                         do_blank_screen(0);
2925                 else
2926                         do_unblank_screen(0);
2927         }
2928         ops->blank_state = blank;
2929 }
2930
2931 static void fbcon_new_modelist(struct fb_info *info)
2932 {
2933         int i;
2934         struct vc_data *vc;
2935         struct fb_var_screeninfo var;
2936         struct fb_videomode *mode;
2937
2938         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2939                 if (registered_fb[con2fb_map[i]] != info)
2940                         continue;
2941                 if (!fb_display[i].mode)
2942                         continue;
2943                 vc = vc_cons[i].d;
2944                 display_to_var(&var, &fb_display[i]);
2945                 mode = fb_find_nearest_mode(fb_display[i].mode,
2946                                             &info->modelist);
2947                 fb_videomode_to_var(&var, mode);
2948
2949                 if (vc)
2950                         fbcon_set_disp(info, &var, vc);
2951                 else
2952                         fbcon_preset_disp(info, &var, i);
2953
2954         }
2955 }
2956
2957 static int fbcon_event_notify(struct notifier_block *self,
2958                               unsigned long action, void *data)
2959 {
2960         struct fb_event *event = data;
2961         struct fb_info *info = event->info;
2962         struct fb_videomode *mode;
2963         struct fb_con2fbmap *con2fb;
2964         int ret = 0;
2965
2966         switch(action) {
2967         case FB_EVENT_SUSPEND:
2968                 fbcon_suspended(info);
2969                 break;
2970         case FB_EVENT_RESUME:
2971                 fbcon_resumed(info);
2972                 break;
2973         case FB_EVENT_MODE_CHANGE:
2974                 fbcon_modechanged(info);
2975                 break;
2976         case FB_EVENT_MODE_CHANGE_ALL:
2977                 fbcon_set_all_vcs(info);
2978                 break;
2979         case FB_EVENT_MODE_DELETE:
2980                 mode = event->data;
2981                 ret = fbcon_mode_deleted(info, mode);
2982                 break;
2983         case FB_EVENT_FB_REGISTERED:
2984                 ret = fbcon_fb_registered(info->node);
2985                 break;
2986         case FB_EVENT_SET_CONSOLE_MAP:
2987                 con2fb = event->data;
2988                 ret = set_con2fb_map(con2fb->console - 1,
2989                                      con2fb->framebuffer, 1);
2990                 break;
2991         case FB_EVENT_GET_CONSOLE_MAP:
2992                 con2fb = event->data;
2993                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
2994                 break;
2995         case FB_EVENT_BLANK:
2996                 fbcon_fb_blanked(info, *(int *)event->data);
2997                 break;
2998         case FB_EVENT_NEW_MODELIST:
2999                 fbcon_new_modelist(info);
3000                 break;
3001         case FB_EVENT_SET_CON_ROTATE:
3002                 fbcon_rotate(info, *(int *)event->data);
3003                 break;
3004         case FB_EVENT_GET_CON_ROTATE:
3005                 ret = fbcon_get_rotate(info);
3006                 break;
3007         case FB_EVENT_SET_CON_ROTATE_ALL:
3008                 fbcon_rotate_all(info, *(int *)event->data);
3009         }
3010
3011         return ret;
3012 }
3013
3014 /*
3015  *  The console `switch' structure for the frame buffer based console
3016  */
3017
3018 static const struct consw fb_con = {
3019         .owner                  = THIS_MODULE,
3020         .con_startup            = fbcon_startup,
3021         .con_init               = fbcon_init,
3022         .con_deinit             = fbcon_deinit,
3023         .con_clear              = fbcon_clear,
3024         .con_putc               = fbcon_putc,
3025         .con_putcs              = fbcon_putcs,
3026         .con_cursor             = fbcon_cursor,
3027         .con_scroll             = fbcon_scroll,
3028         .con_bmove              = fbcon_bmove,
3029         .con_switch             = fbcon_switch,
3030         .con_blank              = fbcon_blank,
3031         .con_font_set           = fbcon_set_font,
3032         .con_font_get           = fbcon_get_font,
3033         .con_font_default       = fbcon_set_def_font,
3034         .con_font_copy          = fbcon_copy_font,
3035         .con_set_palette        = fbcon_set_palette,
3036         .con_scrolldelta        = fbcon_scrolldelta,
3037         .con_set_origin         = fbcon_set_origin,
3038         .con_invert_region      = fbcon_invert_region,
3039         .con_screen_pos         = fbcon_screen_pos,
3040         .con_getxy              = fbcon_getxy,
3041         .con_resize             = fbcon_resize,
3042 };
3043
3044 static struct notifier_block fbcon_event_notifier = {
3045         .notifier_call  = fbcon_event_notify,
3046 };
3047
3048 static int __init fb_console_init(void)
3049 {
3050         int i;
3051
3052         acquire_console_sem();
3053         fb_register_client(&fbcon_event_notifier);
3054         release_console_sem();
3055
3056         for (i = 0; i < MAX_NR_CONSOLES; i++)
3057                 con2fb_map[i] = -1;
3058
3059         if (num_registered_fb) {
3060                 for (i = 0; i < FB_MAX; i++) {
3061                         if (registered_fb[i] != NULL) {
3062                                 info_idx = i;
3063                                 break;
3064                         }
3065                 }
3066                 fbcon_takeover(0);
3067         }
3068
3069         return 0;
3070 }
3071
3072 module_init(fb_console_init);
3073
3074 #ifdef MODULE
3075
3076 static void __exit fb_console_exit(void)
3077 {
3078         acquire_console_sem();
3079         fb_unregister_client(&fbcon_event_notifier);
3080         release_console_sem();
3081         give_up_console(&fb_con);
3082 }
3083
3084 module_exit(fb_console_exit);
3085
3086 #endif
3087
3088 MODULE_LICENSE("GPL");