drivers/video/fbdev/core/fbcon.c

   1 /*
   2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1995 Geert Uytterhoeven
   5  *
   6  *
   7  *  This file is based on the original Amiga console driver (amicon.c):
   8  *
   9  *      Copyright (C) 1993 Hamish Macdonald
  10  *                         Greg Harp
  11  *      Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
  12  *
  13  *            with work by William Rucklidge (wjr@cs.cornell.edu)
  14  *                         Geert Uytterhoeven
  15  *                         Jes Sorensen (jds@kom.auc.dk)
  16  *                         Martin Apel
  17  *
  18  *  and on the original Atari console driver (atacon.c):
  19  *
  20  *      Copyright (C) 1993 Bjoern Brauel
  21  *                         Roman Hodek
  22  *
  23  *            with work by Guenther Kelleter
  24  *                         Martin Schaller
  25  *                         Andreas Schwab
  26  *
  27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
  28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
  29  *  and software scrollback added by
  30  *                         Jakub Jelinek (jj@ultra.linux.cz)
  31  *
  32  *  Random hacking by Martin Mares <mj@ucw.cz>
  33  *
  34  *      2001 - Documented with DocBook
  35  *      - Brad Douglas <brad@neruo.com>
  36  *
  37  *  The low level operations for the various display memory organizations are
  38  *  now in separate source files.
  39  *
  40  *  Currently the following organizations are supported:
  41  *
  42  *    o afb                     Amiga bitplanes
  43  *    o cfb{2,4,8,16,24,32}     Packed pixels
  44  *    o ilbm                    Amiga interleaved bitplanes
  45  *    o iplan2p[248]            Atari interleaved bitplanes
  46  *    o mfb                     Monochrome
  47  *    o vga                     VGA characters/attributes
  48  *
  49  *  To do:
  50  *
  51  *    - Implement 16 plane mode (iplan2p16)
  52  *
  53  *
  54  *  This file is subject to the terms and conditions of the GNU General Public
  55  *  License.  See the file COPYING in the main directory of this archive for
  56  *  more details.
  57  */
  58
  59 #undef FBCONDEBUG
  60
  61 #include <linux/module.h>
  62 #include <linux/types.h>
  63 #include <linux/fs.h>
  64 #include <linux/kernel.h>
  65 #include <linux/delay.h>        /* MSch: for IRQ probe */
  66 #include <linux/console.h>
  67 #include <linux/string.h>
  68 #include <linux/kd.h>
  69 #include <linux/slab.h>
  70 #include <linux/fb.h>
  71 #include <linux/fbcon.h>
  72 #include <linux/vt_kern.h>
  73 #include <linux/selection.h>
  74 #include <linux/font.h>
  75 #include <linux/smp.h>
  76 #include <linux/init.h>
  77 #include <linux/interrupt.h>
  78 #include <linux/crc32.h> /* For counting font checksums */
  79 #include <asm/fb.h>
  80 #include <asm/irq.h>
  81
  82 #include "fbcon.h"
  83
  84 #ifdef FBCONDEBUG
  85 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __func__ , ## args)
  86 #else
  87 #  define DPRINTK(fmt, args...)
  88 #endif
  89
  90 enum {
  91         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
  92         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
  93         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
  94 };
  95
  96 static struct display fb_display[MAX_NR_CONSOLES];
  97
  98 static signed char con2fb_map[MAX_NR_CONSOLES];
  99 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
 100
 101 static int logo_lines;
 102 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 103    enums.  */
 104 static int logo_shown = FBCON_LOGO_CANSHOW;
 105 /* Software scrollback */
 106 static int fbcon_softback_size = 32768;
 107 static unsigned long softback_buf, softback_curr;
 108 static unsigned long softback_in;
 109 static unsigned long softback_top, softback_end;
 110 static int softback_lines;
 111 /* console mappings */
 112 static int first_fb_vc;
 113 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 114 static int fbcon_is_default = 1;
 115 static int fbcon_has_exited;
 116 static int primary_device = -1;
 117 static int fbcon_has_console_bind;
 118
 119 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
 120 static int map_override;
 121
 122 static inline void fbcon_map_override(void)
 123 {
 124         map_override = 1;
 125 }
 126 #else
 127 static inline void fbcon_map_override(void)
 128 {
 129 }
 130 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */
 131
 132 /* font data */
 133 static char fontname[40];
 134
 135 /* current fb_info */
 136 static int info_idx = -1;
 137
 138 /* console rotation */
 139 static int initial_rotation = -1;
 140 static int fbcon_has_sysfs;
 141 static int margin_color;
 142
 143 static const struct consw fb_con;
 144
 145 #define CM_SOFTBACK     (8)
 146
 147 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 148
 149 static int fbcon_set_origin(struct vc_data *);
 150
 151 static int fbcon_cursor_noblink;
 152
 153 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 154
 155 /*
 156  *  Interface used by the world
 157  */
 158
 159 static const char *fbcon_startup(void);
 160 static void fbcon_init(struct vc_data *vc, int init);
 161 static void fbcon_deinit(struct vc_data *vc);
 162 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 163                         int width);
 164 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
 165 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 166                         int count, int ypos, int xpos);
 167 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 168 static void fbcon_cursor(struct vc_data *vc, int mode);
 169 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
 170                         int height, int width);
 171 static int fbcon_switch(struct vc_data *vc);
 172 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
 173 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table);
 174
 175 /*
 176  *  Internal routines
 177  */
 178 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 179 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 180 static __inline__ void ypan_up(struct vc_data *vc, int count);
 181 static __inline__ void ypan_down(struct vc_data *vc, int count);
 182 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
 183                             int dy, int dx, int height, int width, u_int y_break);
 184 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 185                            int unit);
 186 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 187                               int line, int count, int dy);
 188 static void fbcon_modechanged(struct fb_info *info);
 189 static void fbcon_set_all_vcs(struct fb_info *info);
 190 static void fbcon_start(void);
 191 static void fbcon_exit(void);
 192 static struct device *fbcon_device;
 193
 194 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 195 static inline void fbcon_set_rotation(struct fb_info *info)
 196 {
 197         struct fbcon_ops *ops = info->fbcon_par;
 198
 199         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
 200             ops->p->con_rotate < 4)
 201                 ops->rotate = ops->p->con_rotate;
 202         else
 203                 ops->rotate = 0;
 204 }
 205
 206 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 207 {
 208         struct fbcon_ops *ops= info->fbcon_par;
 209         struct fb_info *fb_info;
 210
 211         if (!ops || ops->currcon == -1)
 212                 return;
 213
 214         fb_info = registered_fb[con2fb_map[ops->currcon]];
 215
 216         if (info == fb_info) {
 217                 struct display *p = &fb_display[ops->currcon];
 218
 219                 if (rotate < 4)
 220                         p->con_rotate = rotate;
 221                 else
 222                         p->con_rotate = 0;
 223
 224                 fbcon_modechanged(info);
 225         }
 226 }
 227
 228 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 229 {
 230         struct fbcon_ops *ops = info->fbcon_par;
 231         struct vc_data *vc;
 232         struct display *p;
 233         int i;
 234
 235         if (!ops || ops->currcon < 0 || rotate > 3)
 236                 return;
 237
 238         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 239                 vc = vc_cons[i].d;
 240                 if (!vc || vc->vc_mode != KD_TEXT ||
 241                     registered_fb[con2fb_map[i]] != info)
 242                         continue;
 243
 244                 p = &fb_display[vc->vc_num];
 245                 p->con_rotate = rotate;
 246         }
 247
 248         fbcon_set_all_vcs(info);
 249 }
 250 #else
 251 static inline void fbcon_set_rotation(struct fb_info *info)
 252 {
 253         struct fbcon_ops *ops = info->fbcon_par;
 254
 255         ops->rotate = FB_ROTATE_UR;
 256 }
 257
 258 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 259 {
 260         return;
 261 }
 262
 263 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 264 {
 265         return;
 266 }
 267 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 268
 269 static int fbcon_get_rotate(struct fb_info *info)
 270 {
 271         struct fbcon_ops *ops = info->fbcon_par;
 272
 273         return (ops) ? ops->rotate : 0;
 274 }
 275
 276 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 277 {
 278         struct fbcon_ops *ops = info->fbcon_par;
 279
 280         return (info->state != FBINFO_STATE_RUNNING ||
 281                 vc->vc_mode != KD_TEXT || ops->graphics) &&
 282                 !vt_force_oops_output(vc);
 283 }
 284
 285 static int get_color(struct vc_data *vc, struct fb_info *info,
 286               u16 c, int is_fg)
 287 {
 288         int depth = fb_get_color_depth(&info->var, &info->fix);
 289         int color = 0;
 290
 291         if (console_blanked) {
 292                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 293
 294                 c = vc->vc_video_erase_char & charmask;
 295         }
 296
 297         if (depth != 1)
 298                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 299                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 300
 301         switch (depth) {
 302         case 1:
 303         {
 304                 int col = mono_col(info);
 305                 /* 0 or 1 */
 306                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 307                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 308
 309                 if (console_blanked)
 310                         fg = bg;
 311
 312                 color = (is_fg) ? fg : bg;
 313                 break;
 314         }
 315         case 2:
 316                 /*
 317                  * Scale down 16-colors to 4 colors. Default 4-color palette
 318                  * is grayscale. However, simply dividing the values by 4
 319                  * will not work, as colors 1, 2 and 3 will be scaled-down
 320                  * to zero rendering them invisible.  So empirically convert
 321                  * colors to a sane 4-level grayscale.
 322                  */
 323                 switch (color) {
 324                 case 0:
 325                         color = 0; /* black */
 326                         break;
 327                 case 1 ... 6:
 328                         color = 2; /* white */
 329                         break;
 330                 case 7 ... 8:
 331                         color = 1; /* gray */
 332                         break;
 333                 default:
 334                         color = 3; /* intense white */
 335                         break;
 336                 }
 337                 break;
 338         case 3:
 339                 /*
 340                  * Last 8 entries of default 16-color palette is a more intense
 341                  * version of the first 8 (i.e., same chrominance, different
 342                  * luminance).
 343                  */
 344                 color &= 7;
 345                 break;
 346         }
 347
 348
 349         return color;
 350 }
 351
 352 static void fbcon_update_softback(struct vc_data *vc)
 353 {
 354         int l = fbcon_softback_size / vc->vc_size_row;
 355
 356         if (l > 5)
 357                 softback_end = softback_buf + l * vc->vc_size_row;
 358         else
 359                 /* Smaller scrollback makes no sense, and 0 would screw
 360                    the operation totally */
 361                 softback_top = 0;
 362 }
 363
 364 static void fb_flashcursor(struct work_struct *work)
 365 {
 366         struct fb_info *info = container_of(work, struct fb_info, queue);
 367         struct fbcon_ops *ops = info->fbcon_par;
 368         struct vc_data *vc = NULL;
 369         int c;
 370         int mode;
 371         int ret;
 372
 373         /* FIXME: we should sort out the unbind locking instead */
 374         /* instead we just fail to flash the cursor if we can't get
 375          * the lock instead of blocking fbcon deinit */
 376         ret = console_trylock();
 377         if (ret == 0)
 378                 return;
 379
 380         if (ops && ops->currcon != -1)
 381                 vc = vc_cons[ops->currcon].d;
 382
 383         if (!vc || !con_is_visible(vc) ||
 384             registered_fb[con2fb_map[vc->vc_num]] != info ||
 385             vc->vc_deccm != 1) {
 386                 console_unlock();
 387                 return;
 388         }
 389
 390         c = scr_readw((u16 *) vc->vc_pos);
 391         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 392                 CM_ERASE : CM_DRAW;
 393         ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
 394                     get_color(vc, info, c, 0));
 395         console_unlock();
 396 }
 397
 398 static void cursor_timer_handler(struct timer_list *t)
 399 {
 400         struct fbcon_ops *ops = from_timer(ops, t, cursor_timer);
 401         struct fb_info *info = ops->info;
 402
 403         queue_work(system_power_efficient_wq, &info->queue);
 404         mod_timer(&ops->cursor_timer, jiffies + ops->cur_blink_jiffies);
 405 }
 406
 407 static void fbcon_add_cursor_timer(struct fb_info *info)
 408 {
 409         struct fbcon_ops *ops = info->fbcon_par;
 410
 411         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
 412             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER) &&
 413             !fbcon_cursor_noblink) {
 414                 if (!info->queue.func)
 415                         INIT_WORK(&info->queue, fb_flashcursor);
 416
 417                 timer_setup(&ops->cursor_timer, cursor_timer_handler, 0);
 418                 mod_timer(&ops->cursor_timer, jiffies + ops->cur_blink_jiffies);
 419                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
 420         }
 421 }
 422
 423 static void fbcon_del_cursor_timer(struct fb_info *info)
 424 {
 425         struct fbcon_ops *ops = info->fbcon_par;
 426
 427         if (info->queue.func == fb_flashcursor &&
 428             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
 429                 del_timer_sync(&ops->cursor_timer);
 430                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
 431         }
 432 }
 433
 434 #ifndef MODULE
 435 static int __init fb_console_setup(char *this_opt)
 436 {
 437         char *options;
 438         int i, j;
 439
 440         if (!this_opt || !*this_opt)
 441                 return 1;
 442
 443         while ((options = strsep(&this_opt, ",")) != NULL) {
 444                 if (!strncmp(options, "font:", 5)) {
 445                         strlcpy(fontname, options + 5, sizeof(fontname));
 446                         continue;
 447                 }
 448
 449                 if (!strncmp(options, "scrollback:", 11)) {
 450                         options += 11;
 451                         if (*options) {
 452                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
 453                                 if (*options == 'k' || *options == 'K') {
 454                                         fbcon_softback_size *= 1024;
 455                                 }
 456                         }
 457                         continue;
 458                 }
 459
 460                 if (!strncmp(options, "map:", 4)) {
 461                         options += 4;
 462                         if (*options) {
 463                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 464                                         if (!options[j])
 465                                                 j = 0;
 466                                         con2fb_map_boot[i] =
 467                                                 (options[j++]-'0') % FB_MAX;
 468                                 }
 469
 470                                 fbcon_map_override();
 471                         }
 472                         continue;
 473                 }
 474
 475                 if (!strncmp(options, "vc:", 3)) {
 476                         options += 3;
 477                         if (*options)
 478                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 479                         if (first_fb_vc < 0)
 480                                 first_fb_vc = 0;
 481                         if (*options++ == '-')
 482                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 483                         fbcon_is_default = 0;
 484                         continue;
 485                 }
 486
 487                 if (!strncmp(options, "rotate:", 7)) {
 488                         options += 7;
 489                         if (*options)
 490                                 initial_rotation = simple_strtoul(options, &options, 0);
 491                         if (initial_rotation > 3)
 492                                 initial_rotation = 0;
 493                         continue;
 494                 }
 495
 496                 if (!strncmp(options, "margin:", 7)) {
 497                         options += 7;
 498                         if (*options)
 499                                 margin_color = simple_strtoul(options, &options, 0);
 500                         continue;
 501                 }
 502         }
 503         return 1;
 504 }
 505
 506 __setup("fbcon=", fb_console_setup);
 507 #endif
 508
 509 static int search_fb_in_map(int idx)
 510 {
 511         int i, retval = 0;
 512
 513         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 514                 if (con2fb_map[i] == idx)
 515                         retval = 1;
 516         }
 517         return retval;
 518 }
 519
 520 static int search_for_mapped_con(void)
 521 {
 522         int i, retval = 0;
 523
 524         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 525                 if (con2fb_map[i] != -1)
 526                         retval = 1;
 527         }
 528         return retval;
 529 }
 530
 531 static int do_fbcon_takeover(int show_logo)
 532 {
 533         int err, i;
 534
 535         if (!num_registered_fb)
 536                 return -ENODEV;
 537
 538         if (!show_logo)
 539                 logo_shown = FBCON_LOGO_DONTSHOW;
 540
 541         for (i = first_fb_vc; i <= last_fb_vc; i++)
 542                 con2fb_map[i] = info_idx;
 543
 544         err = do_take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 545                                 fbcon_is_default);
 546
 547         if (err) {
 548                 for (i = first_fb_vc; i <= last_fb_vc; i++)
 549                         con2fb_map[i] = -1;
 550                 info_idx = -1;
 551         } else {
 552                 fbcon_has_console_bind = 1;
 553         }
 554
 555         return err;
 556 }
 557
 558 #ifdef MODULE
 559 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 560                                int cols, int rows, int new_cols, int new_rows)
 561 {
 562         logo_shown = FBCON_LOGO_DONTSHOW;
 563 }
 564 #else
 565 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 566                                int cols, int rows, int new_cols, int new_rows)
 567 {
 568         /* Need to make room for the logo */
 569         struct fbcon_ops *ops = info->fbcon_par;
 570         int cnt, erase = vc->vc_video_erase_char, step;
 571         unsigned short *save = NULL, *r, *q;
 572         int logo_height;
 573
 574         if (info->fbops->owner) {
 575                 logo_shown = FBCON_LOGO_DONTSHOW;
 576                 return;
 577         }
 578
 579         /*
 580          * remove underline attribute from erase character
 581          * if black and white framebuffer.
 582          */
 583         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 584                 erase &= ~0x400;
 585         logo_height = fb_prepare_logo(info, ops->rotate);
 586         logo_lines = DIV_ROUND_UP(logo_height, vc->vc_font.height);
 587         q = (unsigned short *) (vc->vc_origin +
 588                                 vc->vc_size_row * rows);
 589         step = logo_lines * cols;
 590         for (r = q - logo_lines * cols; r < q; r++)
 591                 if (scr_readw(r) != vc->vc_video_erase_char)
 592                         break;
 593         if (r != q && new_rows >= rows + logo_lines) {
 594                 save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
 595                 if (save) {
 596                         int i = cols < new_cols ? cols : new_cols;
 597                         scr_memsetw(save, erase, logo_lines * new_cols * 2);
 598                         r = q - step;
 599                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 600                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 601                         r = q;
 602                 }
 603         }
 604         if (r == q) {
 605                 /* We can scroll screen down */
 606                 r = q - step - cols;
 607                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 608                         scr_memcpyw(r + step, r, vc->vc_size_row);
 609                         r -= cols;
 610                 }
 611                 if (!save) {
 612                         int lines;
 613                         if (vc->vc_y + logo_lines >= rows)
 614                                 lines = rows - vc->vc_y - 1;
 615                         else
 616                                 lines = logo_lines;
 617                         vc->vc_y += lines;
 618                         vc->vc_pos += lines * vc->vc_size_row;
 619                 }
 620         }
 621         scr_memsetw((unsigned short *) vc->vc_origin,
 622                     erase,
 623                     vc->vc_size_row * logo_lines);
 624
 625         if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
 626                 fbcon_clear_margins(vc, 0);
 627                 update_screen(vc);
 628         }
 629
 630         if (save) {
 631                 q = (unsigned short *) (vc->vc_origin +
 632                                         vc->vc_size_row *
 633                                         rows);
 634                 scr_memcpyw(q, save, logo_lines * new_cols * 2);
 635                 vc->vc_y += logo_lines;
 636                 vc->vc_pos += logo_lines * vc->vc_size_row;
 637                 kfree(save);
 638         }
 639
 640         if (logo_lines > vc->vc_bottom) {
 641                 logo_shown = FBCON_LOGO_CANSHOW;
 642                 printk(KERN_INFO
 643                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
 644         } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
 645                 logo_shown = FBCON_LOGO_DRAW;
 646                 vc->vc_top = logo_lines;
 647         }
 648 }
 649 #endif /* MODULE */
 650
 651 #ifdef CONFIG_FB_TILEBLITTING
 652 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 653 {
 654         struct fbcon_ops *ops = info->fbcon_par;
 655
 656         ops->p = &fb_display[vc->vc_num];
 657
 658         if ((info->flags & FBINFO_MISC_TILEBLITTING))
 659                 fbcon_set_tileops(vc, info);
 660         else {
 661                 fbcon_set_rotation(info);
 662                 fbcon_set_bitops(ops);
 663         }
 664 }
 665
 666 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 667 {
 668         int err = 0;
 669
 670         if (info->flags & FBINFO_MISC_TILEBLITTING &&
 671             info->tileops->fb_get_tilemax(info) < charcount)
 672                 err = 1;
 673
 674         return err;
 675 }
 676 #else
 677 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 678 {
 679         struct fbcon_ops *ops = info->fbcon_par;
 680
 681         info->flags &= ~FBINFO_MISC_TILEBLITTING;
 682         ops->p = &fb_display[vc->vc_num];
 683         fbcon_set_rotation(info);
 684         fbcon_set_bitops(ops);
 685 }
 686
 687 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 688 {
 689         return 0;
 690 }
 691
 692 #endif /* CONFIG_MISC_TILEBLITTING */
 693
 694
 695 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
 696                                   int unit, int oldidx)
 697 {
 698         struct fbcon_ops *ops = NULL;
 699         int err = 0;
 700
 701         if (!try_module_get(info->fbops->owner))
 702                 err = -ENODEV;
 703
 704         if (!err && info->fbops->fb_open &&
 705             info->fbops->fb_open(info, 0))
 706                 err = -ENODEV;
 707
 708         if (!err) {
 709                 ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 710                 if (!ops)
 711                         err = -ENOMEM;
 712         }
 713
 714         if (!err) {
 715                 ops->cur_blink_jiffies = HZ / 5;
 716                 ops->info = info;
 717                 info->fbcon_par = ops;
 718
 719                 if (vc)
 720                         set_blitting_type(vc, info);
 721         }
 722
 723         if (err) {
 724                 con2fb_map[unit] = oldidx;
 725                 module_put(info->fbops->owner);
 726         }
 727
 728         return err;
 729 }
 730
 731 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 732                                   struct fb_info *newinfo, int unit,
 733                                   int oldidx, int found)
 734 {
 735         struct fbcon_ops *ops = oldinfo->fbcon_par;
 736         int err = 0, ret;
 737
 738         if (oldinfo->fbops->fb_release &&
 739             oldinfo->fbops->fb_release(oldinfo, 0)) {
 740                 con2fb_map[unit] = oldidx;
 741                 if (!found && newinfo->fbops->fb_release)
 742                         newinfo->fbops->fb_release(newinfo, 0);
 743                 if (!found)
 744                         module_put(newinfo->fbops->owner);
 745                 err = -ENODEV;
 746         }
 747
 748         if (!err) {
 749                 fbcon_del_cursor_timer(oldinfo);
 750                 kfree(ops->cursor_state.mask);
 751                 kfree(ops->cursor_data);
 752                 kfree(ops->cursor_src);
 753                 kfree(ops->fontbuffer);
 754                 kfree(oldinfo->fbcon_par);
 755                 oldinfo->fbcon_par = NULL;
 756                 module_put(oldinfo->fbops->owner);
 757                 /*
 758                   If oldinfo and newinfo are driving the same hardware,
 759                   the fb_release() method of oldinfo may attempt to
 760                   restore the hardware state.  This will leave the
 761                   newinfo in an undefined state. Thus, a call to
 762                   fb_set_par() may be needed for the newinfo.
 763                 */
 764                 if (newinfo && newinfo->fbops->fb_set_par) {
 765                         ret = newinfo->fbops->fb_set_par(newinfo);
 766
 767                         if (ret)
 768                                 printk(KERN_ERR "con2fb_release_oldinfo: "
 769                                         "detected unhandled fb_set_par error, "
 770                                         "error code %d\n", ret);
 771                 }
 772         }
 773
 774         return err;
 775 }
 776
 777 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 778                                 int unit, int show_logo)
 779 {
 780         struct fbcon_ops *ops = info->fbcon_par;
 781         int ret;
 782
 783         ops->currcon = fg_console;
 784
 785         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT)) {
 786                 ret = info->fbops->fb_set_par(info);
 787
 788                 if (ret)
 789                         printk(KERN_ERR "con2fb_init_display: detected "
 790                                 "unhandled fb_set_par error, "
 791                                 "error code %d\n", ret);
 792         }
 793
 794         ops->flags |= FBCON_FLAGS_INIT;
 795         ops->graphics = 0;
 796         fbcon_set_disp(info, &info->var, unit);
 797
 798         if (show_logo) {
 799                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 800                 struct fb_info *fg_info =
 801                         registered_fb[con2fb_map[fg_console]];
 802
 803                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 804                                    fg_vc->vc_rows, fg_vc->vc_cols,
 805                                    fg_vc->vc_rows);
 806         }
 807
 808         update_screen(vc_cons[fg_console].d);
 809 }
 810
 811 /**
 812  *      set_con2fb_map - map console to frame buffer device
 813  *      @unit: virtual console number to map
 814  *      @newidx: frame buffer index to map virtual console to
 815  *      @user: user request
 816  *
 817  *      Maps a virtual console @unit to a frame buffer device
 818  *      @newidx.
 819  *
 820  *      This should be called with the console lock held.
 821  */
 822 static int set_con2fb_map(int unit, int newidx, int user)
 823 {
 824         struct vc_data *vc = vc_cons[unit].d;
 825         int oldidx = con2fb_map[unit];
 826         struct fb_info *info = registered_fb[newidx];
 827         struct fb_info *oldinfo = NULL;
 828         int found, err = 0;
 829
 830         if (oldidx == newidx)
 831                 return 0;
 832
 833         if (!info)
 834                 return -EINVAL;
 835
 836         if (!search_for_mapped_con() || !con_is_bound(&fb_con)) {
 837                 info_idx = newidx;
 838                 return do_fbcon_takeover(0);
 839         }
 840
 841         if (oldidx != -1)
 842                 oldinfo = registered_fb[oldidx];
 843
 844         found = search_fb_in_map(newidx);
 845
 846         con2fb_map[unit] = newidx;
 847         if (!err && !found)
 848                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 849
 850
 851         /*
 852          * If old fb is not mapped to any of the consoles,
 853          * fbcon should release it.
 854          */
 855         if (!err && oldinfo && !search_fb_in_map(oldidx))
 856                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 857                                              found);
 858
 859         if (!err) {
 860                 int show_logo = (fg_console == 0 && !user &&
 861                                  logo_shown != FBCON_LOGO_DONTSHOW);
 862
 863                 if (!found)
 864                         fbcon_add_cursor_timer(info);
 865                 con2fb_map_boot[unit] = newidx;
 866                 con2fb_init_display(vc, info, unit, show_logo);
 867         }
 868
 869         if (!search_fb_in_map(info_idx))
 870                 info_idx = newidx;
 871
 872         return err;
 873 }
 874
 875 /*
 876  *  Low Level Operations
 877  */
 878 /* NOTE: fbcon cannot be __init: it may be called from do_take_over_console later */
 879 static int var_to_display(struct display *disp,
 880                           struct fb_var_screeninfo *var,
 881                           struct fb_info *info)
 882 {
 883         disp->xres_virtual = var->xres_virtual;
 884         disp->yres_virtual = var->yres_virtual;
 885         disp->bits_per_pixel = var->bits_per_pixel;
 886         disp->grayscale = var->grayscale;
 887         disp->nonstd = var->nonstd;
 888         disp->accel_flags = var->accel_flags;
 889         disp->height = var->height;
 890         disp->width = var->width;
 891         disp->red = var->red;
 892         disp->green = var->green;
 893         disp->blue = var->blue;
 894         disp->transp = var->transp;
 895         disp->rotate = var->rotate;
 896         disp->mode = fb_match_mode(var, &info->modelist);
 897         if (disp->mode == NULL)
 898                 /* This should not happen */
 899                 return -EINVAL;
 900         return 0;
 901 }
 902
 903 static void display_to_var(struct fb_var_screeninfo *var,
 904                            struct display *disp)
 905 {
 906         fb_videomode_to_var(var, disp->mode);
 907         var->xres_virtual = disp->xres_virtual;
 908         var->yres_virtual = disp->yres_virtual;
 909         var->bits_per_pixel = disp->bits_per_pixel;
 910         var->grayscale = disp->grayscale;
 911         var->nonstd = disp->nonstd;
 912         var->accel_flags = disp->accel_flags;
 913         var->height = disp->height;
 914         var->width = disp->width;
 915         var->red = disp->red;
 916         var->green = disp->green;
 917         var->blue = disp->blue;
 918         var->transp = disp->transp;
 919         var->rotate = disp->rotate;
 920 }
 921
 922 static const char *fbcon_startup(void)
 923 {
 924         const char *display_desc = "frame buffer device";
 925         struct display *p = &fb_display[fg_console];
 926         struct vc_data *vc = vc_cons[fg_console].d;
 927         const struct font_desc *font = NULL;
 928         struct module *owner;
 929         struct fb_info *info = NULL;
 930         struct fbcon_ops *ops;
 931         int rows, cols;
 932
 933         /*
 934          *  If num_registered_fb is zero, this is a call for the dummy part.
 935          *  The frame buffer devices weren't initialized yet.
 936          */
 937         if (!num_registered_fb || info_idx == -1)
 938                 return display_desc;
 939         /*
 940          * Instead of blindly using registered_fb[0], we use info_idx, set by
 941          * fb_console_init();
 942          */
 943         info = registered_fb[info_idx];
 944         if (!info)
 945                 return NULL;
 946
 947         owner = info->fbops->owner;
 948         if (!try_module_get(owner))
 949                 return NULL;
 950         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 951                 module_put(owner);
 952                 return NULL;
 953         }
 954
 955         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 956         if (!ops) {
 957                 module_put(owner);
 958                 return NULL;
 959         }
 960
 961         ops->currcon = -1;
 962         ops->graphics = 1;
 963         ops->cur_rotate = -1;
 964         ops->cur_blink_jiffies = HZ / 5;
 965         ops->info = info;
 966         info->fbcon_par = ops;
 967         if (initial_rotation != -1)
 968                 p->con_rotate = initial_rotation;
 969         else
 970                 p->con_rotate = fbcon_platform_get_rotate(info);
 971         set_blitting_type(vc, info);
 972
 973         if (info->fix.type != FB_TYPE_TEXT) {
 974                 if (fbcon_softback_size) {
 975                         if (!softback_buf) {
 976                                 softback_buf =
 977                                     (unsigned long)
 978                                     kmalloc(fbcon_softback_size,
 979                                             GFP_KERNEL);
 980                                 if (!softback_buf) {
 981                                         fbcon_softback_size = 0;
 982                                         softback_top = 0;
 983                                 }
 984                         }
 985                 } else {
 986                         if (softback_buf) {
 987                                 kfree((void *) softback_buf);
 988                                 softback_buf = 0;
 989                                 softback_top = 0;
 990                         }
 991                 }
 992                 if (softback_buf)
 993                         softback_in = softback_top = softback_curr =
 994                             softback_buf;
 995                 softback_lines = 0;
 996         }
 997
 998         /* Setup default font */
 999         if (!p->fontdata && !vc->vc_font.data) {
1000                 if (!fontname[0] || !(font = find_font(fontname)))
1001                         font = get_default_font(info->var.xres,
1002                                                 info->var.yres,
1003                                                 info->pixmap.blit_x,
1004                                                 info->pixmap.blit_y);
1005                 vc->vc_font.width = font->width;
1006                 vc->vc_font.height = font->height;
1007                 vc->vc_font.data = (void *)(p->fontdata = font->data);
1008                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
1009         } else {
1010                 p->fontdata = vc->vc_font.data;
1011         }
1012
1013         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1014         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1015         cols /= vc->vc_font.width;
1016         rows /= vc->vc_font.height;
1017         vc_resize(vc, cols, rows);
1018
1019         DPRINTK("mode:   %s\n", info->fix.id);
1020         DPRINTK("visual: %d\n", info->fix.visual);
1021         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
1022                 info->var.yres,
1023                 info->var.bits_per_pixel);
1024
1025         fbcon_add_cursor_timer(info);
1026         fbcon_has_exited = 0;
1027         return display_desc;
1028 }
1029
1030 static void fbcon_init(struct vc_data *vc, int init)
1031 {
1032         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1033         struct fbcon_ops *ops;
1034         struct vc_data **default_mode = vc->vc_display_fg;
1035         struct vc_data *svc = *default_mode;
1036         struct display *t, *p = &fb_display[vc->vc_num];
1037         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1038         int cap, ret;
1039
1040         if (info_idx == -1 || info == NULL)
1041             return;
1042
1043         cap = info->flags;
1044
1045         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1046             (info->fix.type == FB_TYPE_TEXT))
1047                 logo = 0;
1048
1049         if (var_to_display(p, &info->var, info))
1050                 return;
1051
1052         if (!info->fbcon_par)
1053                 con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);
1054
1055         /* If we are not the first console on this
1056            fb, copy the font from that console */
1057         t = &fb_display[fg_console];
1058         if (!p->fontdata) {
1059                 if (t->fontdata) {
1060                         struct vc_data *fvc = vc_cons[fg_console].d;
1061
1062                         vc->vc_font.data = (void *)(p->fontdata =
1063                                                     fvc->vc_font.data);
1064                         vc->vc_font.width = fvc->vc_font.width;
1065                         vc->vc_font.height = fvc->vc_font.height;
1066                         p->userfont = t->userfont;
1067
1068                         if (p->userfont)
1069                                 REFCOUNT(p->fontdata)++;
1070                 } else {
1071                         const struct font_desc *font = NULL;
1072
1073                         if (!fontname[0] || !(font = find_font(fontname)))
1074                                 font = get_default_font(info->var.xres,
1075                                                         info->var.yres,
1076                                                         info->pixmap.blit_x,
1077                                                         info->pixmap.blit_y);
1078                         vc->vc_font.width = font->width;
1079                         vc->vc_font.height = font->height;
1080                         vc->vc_font.data = (void *)(p->fontdata = font->data);
1081                         vc->vc_font.charcount = 256; /* FIXME  Need to
1082                                                         support more fonts */
1083                 }
1084         }
1085
1086         if (p->userfont)
1087                 charcnt = FNTCHARCNT(p->fontdata);
1088
1089         vc->vc_panic_force_write = !!(info->flags & FBINFO_CAN_FORCE_OUTPUT);
1090         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1091         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1092         if (charcnt == 256) {
1093                 vc->vc_hi_font_mask = 0;
1094         } else {
1095                 vc->vc_hi_font_mask = 0x100;
1096                 if (vc->vc_can_do_color)
1097                         vc->vc_complement_mask <<= 1;
1098         }
1099
1100         if (!*svc->vc_uni_pagedir_loc)
1101                 con_set_default_unimap(svc);
1102         if (!*vc->vc_uni_pagedir_loc)
1103                 con_copy_unimap(vc, svc);
1104
1105         ops = info->fbcon_par;
1106         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1107         if (initial_rotation != -1)
1108                 p->con_rotate = initial_rotation;
1109         else
1110                 p->con_rotate = fbcon_platform_get_rotate(info);
1111         set_blitting_type(vc, info);
1112
1113         cols = vc->vc_cols;
1114         rows = vc->vc_rows;
1115         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1116         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1117         new_cols /= vc->vc_font.width;
1118         new_rows /= vc->vc_font.height;
1119
1120         /*
1121          * We must always set the mode. The mode of the previous console
1122          * driver could be in the same resolution but we are using different
1123          * hardware so we have to initialize the hardware.
1124          *
1125          * We need to do it in fbcon_init() to prevent screen corruption.
1126          */
1127         if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
1128                 if (info->fbops->fb_set_par &&
1129                     !(ops->flags & FBCON_FLAGS_INIT)) {
1130                         ret = info->fbops->fb_set_par(info);
1131
1132                         if (ret)
1133                                 printk(KERN_ERR "fbcon_init: detected "
1134                                         "unhandled fb_set_par error, "
1135                                         "error code %d\n", ret);
1136                 }
1137
1138                 ops->flags |= FBCON_FLAGS_INIT;
1139         }
1140
1141         ops->graphics = 0;
1142
1143         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1144             !(cap & FBINFO_HWACCEL_DISABLED))
1145                 p->scrollmode = SCROLL_MOVE;
1146         else /* default to something safe */
1147                 p->scrollmode = SCROLL_REDRAW;
1148
1149         /*
1150          *  ++guenther: console.c:vc_allocate() relies on initializing
1151          *  vc_{cols,rows}, but we must not set those if we are only
1152          *  resizing the console.
1153          */
1154         if (init) {
1155                 vc->vc_cols = new_cols;
1156                 vc->vc_rows = new_rows;
1157         } else
1158                 vc_resize(vc, new_cols, new_rows);
1159
1160         if (logo)
1161                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1162
1163         if (vc == svc && softback_buf)
1164                 fbcon_update_softback(vc);
1165
1166         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1167                 ops->rotate = FB_ROTATE_UR;
1168                 set_blitting_type(vc, info);
1169         }
1170
1171         ops->p = &fb_display[fg_console];
1172 }
1173
1174 static void fbcon_free_font(struct display *p, bool freefont)
1175 {
1176         if (freefont && p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
1177                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
1178         p->fontdata = NULL;
1179         p->userfont = 0;
1180 }
1181
1182 static void set_vc_hi_font(struct vc_data *vc, bool set);
1183
1184 static void fbcon_deinit(struct vc_data *vc)
1185 {
1186         struct display *p = &fb_display[vc->vc_num];
1187         struct fb_info *info;
1188         struct fbcon_ops *ops;
1189         int idx;
1190         bool free_font = true;
1191
1192         idx = con2fb_map[vc->vc_num];
1193
1194         if (idx == -1)
1195                 goto finished;
1196
1197         info = registered_fb[idx];
1198
1199         if (!info)
1200                 goto finished;
1201
1202         if (info->flags & FBINFO_MISC_FIRMWARE)
1203                 free_font = false;
1204         ops = info->fbcon_par;
1205
1206         if (!ops)
1207                 goto finished;
1208
1209         if (con_is_visible(vc))
1210                 fbcon_del_cursor_timer(info);
1211
1212         ops->flags &= ~FBCON_FLAGS_INIT;
1213 finished:
1214
1215         fbcon_free_font(p, free_font);
1216         if (free_font)
1217                 vc->vc_font.data = NULL;
1218
1219         if (vc->vc_hi_font_mask)
1220                 set_vc_hi_font(vc, false);
1221
1222         if (!con_is_bound(&fb_con))
1223                 fbcon_exit();
1224
1225         return;
1226 }
1227
1228 /* ====================================================================== */
1229
1230 /*  fbcon_XXX routines - interface used by the world
1231  *
1232  *  This system is now divided into two levels because of complications
1233  *  caused by hardware scrolling. Top level functions:
1234  *
1235  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1236  *
1237  *  handles y values in range [0, scr_height-1] that correspond to real
1238  *  screen positions. y_wrap shift means that first line of bitmap may be
1239  *  anywhere on this display. These functions convert lineoffsets to
1240  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1241  *
1242  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1243  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1244  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1245  *
1246  *  WARNING:
1247  *
1248  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1249  *  Implies should only really hardware scroll in rows. Only reason for
1250  *  restriction is simplicity & efficiency at the moment.
1251  */
1252
1253 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1254                         int width)
1255 {
1256         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1257         struct fbcon_ops *ops = info->fbcon_par;
1258
1259         struct display *p = &fb_display[vc->vc_num];
1260         u_int y_break;
1261
1262         if (fbcon_is_inactive(vc, info))
1263                 return;
1264
1265         if (!height || !width)
1266                 return;
1267
1268         if (sy < vc->vc_top && vc->vc_top == logo_lines) {
1269                 vc->vc_top = 0;
1270                 /*
1271                  * If the font dimensions are not an integral of the display
1272                  * dimensions then the ops->clear below won't end up clearing
1273                  * the margins.  Call clear_margins here in case the logo
1274                  * bitmap stretched into the margin area.
1275                  */
1276                 fbcon_clear_margins(vc, 0);
1277         }
1278
1279         /* Split blits that cross physical y_wrap boundary */
1280
1281         y_break = p->vrows - p->yscroll;
1282         if (sy < y_break && sy + height - 1 >= y_break) {
1283                 u_int b = y_break - sy;
1284                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1285                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1286                                  width);
1287         } else
1288                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1289 }
1290
1291 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1292                         int count, int ypos, int xpos)
1293 {
1294         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1295         struct display *p = &fb_display[vc->vc_num];
1296         struct fbcon_ops *ops = info->fbcon_par;
1297
1298         if (!fbcon_is_inactive(vc, info))
1299                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1300                            get_color(vc, info, scr_readw(s), 1),
1301                            get_color(vc, info, scr_readw(s), 0));
1302 }
1303
1304 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1305 {
1306         unsigned short chr;
1307
1308         scr_writew(c, &chr);
1309         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1310 }
1311
1312 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1313 {
1314         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1315         struct fbcon_ops *ops = info->fbcon_par;
1316
1317         if (!fbcon_is_inactive(vc, info))
1318                 ops->clear_margins(vc, info, margin_color, bottom_only);
1319 }
1320
1321 static void fbcon_cursor(struct vc_data *vc, int mode)
1322 {
1323         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1324         struct fbcon_ops *ops = info->fbcon_par;
1325         int y;
1326         int c = scr_readw((u16 *) vc->vc_pos);
1327
1328         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1329
1330         if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
1331                 return;
1332
1333         if (vc->vc_cursor_type & 0x10)
1334                 fbcon_del_cursor_timer(info);
1335         else
1336                 fbcon_add_cursor_timer(info);
1337
1338         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1339         if (mode & CM_SOFTBACK) {
1340                 mode &= ~CM_SOFTBACK;
1341                 y = softback_lines;
1342         } else {
1343                 if (softback_lines)
1344                         fbcon_set_origin(vc);
1345                 y = 0;
1346         }
1347
1348         ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
1349                     get_color(vc, info, c, 0));
1350 }
1351
1352 static int scrollback_phys_max = 0;
1353 static int scrollback_max = 0;
1354 static int scrollback_current = 0;
1355
1356 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1357                            int unit)
1358 {
1359         struct display *p, *t;
1360         struct vc_data **default_mode, *vc;
1361         struct vc_data *svc;
1362         struct fbcon_ops *ops = info->fbcon_par;
1363         int rows, cols, charcnt = 256;
1364
1365         p = &fb_display[unit];
1366
1367         if (var_to_display(p, var, info))
1368                 return;
1369
1370         vc = vc_cons[unit].d;
1371
1372         if (!vc)
1373                 return;
1374
1375         default_mode = vc->vc_display_fg;
1376         svc = *default_mode;
1377         t = &fb_display[svc->vc_num];
1378
1379         if (!vc->vc_font.data) {
1380                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1381                 vc->vc_font.width = (*default_mode)->vc_font.width;
1382                 vc->vc_font.height = (*default_mode)->vc_font.height;
1383                 p->userfont = t->userfont;
1384                 if (p->userfont)
1385                         REFCOUNT(p->fontdata)++;
1386         }
1387         if (p->userfont)
1388                 charcnt = FNTCHARCNT(p->fontdata);
1389
1390         var->activate = FB_ACTIVATE_NOW;
1391         info->var.activate = var->activate;
1392         var->yoffset = info->var.yoffset;
1393         var->xoffset = info->var.xoffset;
1394         fb_set_var(info, var);
1395         ops->var = info->var;
1396         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1397         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1398         if (charcnt == 256) {
1399                 vc->vc_hi_font_mask = 0;
1400         } else {
1401                 vc->vc_hi_font_mask = 0x100;
1402                 if (vc->vc_can_do_color)
1403                         vc->vc_complement_mask <<= 1;
1404         }
1405
1406         if (!*svc->vc_uni_pagedir_loc)
1407                 con_set_default_unimap(svc);
1408         if (!*vc->vc_uni_pagedir_loc)
1409                 con_copy_unimap(vc, svc);
1410
1411         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1412         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1413         cols /= vc->vc_font.width;
1414         rows /= vc->vc_font.height;
1415         vc_resize(vc, cols, rows);
1416
1417         if (con_is_visible(vc)) {
1418                 update_screen(vc);
1419                 if (softback_buf)
1420                         fbcon_update_softback(vc);
1421         }
1422 }
1423
1424 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1425 {
1426         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1427         struct fbcon_ops *ops = info->fbcon_par;
1428         struct display *p = &fb_display[vc->vc_num];
1429
1430         p->yscroll += count;
1431         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1432                 p->yscroll -= p->vrows;
1433         ops->var.xoffset = 0;
1434         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1435         ops->var.vmode |= FB_VMODE_YWRAP;
1436         ops->update_start(info);
1437         scrollback_max += count;
1438         if (scrollback_max > scrollback_phys_max)
1439                 scrollback_max = scrollback_phys_max;
1440         scrollback_current = 0;
1441 }
1442
1443 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1444 {
1445         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1446         struct fbcon_ops *ops = info->fbcon_par;
1447         struct display *p = &fb_display[vc->vc_num];
1448
1449         p->yscroll -= count;
1450         if (p->yscroll < 0)     /* Deal with wrap */
1451                 p->yscroll += p->vrows;
1452         ops->var.xoffset = 0;
1453         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1454         ops->var.vmode |= FB_VMODE_YWRAP;
1455         ops->update_start(info);
1456         scrollback_max -= count;
1457         if (scrollback_max < 0)
1458                 scrollback_max = 0;
1459         scrollback_current = 0;
1460 }
1461
1462 static __inline__ void ypan_up(struct vc_data *vc, int count)
1463 {
1464         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1465         struct display *p = &fb_display[vc->vc_num];
1466         struct fbcon_ops *ops = info->fbcon_par;
1467
1468         p->yscroll += count;
1469         if (p->yscroll > p->vrows - vc->vc_rows) {
1470                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1471                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1472                 p->yscroll -= p->vrows - vc->vc_rows;
1473         }
1474
1475         ops->var.xoffset = 0;
1476         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1477         ops->var.vmode &= ~FB_VMODE_YWRAP;
1478         ops->update_start(info);
1479         fbcon_clear_margins(vc, 1);
1480         scrollback_max += count;
1481         if (scrollback_max > scrollback_phys_max)
1482                 scrollback_max = scrollback_phys_max;
1483         scrollback_current = 0;
1484 }
1485
1486 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1487 {
1488         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1489         struct fbcon_ops *ops = info->fbcon_par;
1490         struct display *p = &fb_display[vc->vc_num];
1491
1492         p->yscroll += count;
1493
1494         if (p->yscroll > p->vrows - vc->vc_rows) {
1495                 p->yscroll -= p->vrows - vc->vc_rows;
1496                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1497         }
1498
1499         ops->var.xoffset = 0;
1500         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1501         ops->var.vmode &= ~FB_VMODE_YWRAP;
1502         ops->update_start(info);
1503         fbcon_clear_margins(vc, 1);
1504         scrollback_max += count;
1505         if (scrollback_max > scrollback_phys_max)
1506                 scrollback_max = scrollback_phys_max;
1507         scrollback_current = 0;
1508 }
1509
1510 static __inline__ void ypan_down(struct vc_data *vc, int count)
1511 {
1512         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1513         struct display *p = &fb_display[vc->vc_num];
1514         struct fbcon_ops *ops = info->fbcon_par;
1515
1516         p->yscroll -= count;
1517         if (p->yscroll < 0) {
1518                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1519                             0, vc->vc_rows, vc->vc_cols);
1520                 p->yscroll += p->vrows - vc->vc_rows;
1521         }
1522
1523         ops->var.xoffset = 0;
1524         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1525         ops->var.vmode &= ~FB_VMODE_YWRAP;
1526         ops->update_start(info);
1527         fbcon_clear_margins(vc, 1);
1528         scrollback_max -= count;
1529         if (scrollback_max < 0)
1530                 scrollback_max = 0;
1531         scrollback_current = 0;
1532 }
1533
1534 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1535 {
1536         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1537         struct fbcon_ops *ops = info->fbcon_par;
1538         struct display *p = &fb_display[vc->vc_num];
1539
1540         p->yscroll -= count;
1541
1542         if (p->yscroll < 0) {
1543                 p->yscroll += p->vrows - vc->vc_rows;
1544                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1545         }
1546
1547         ops->var.xoffset = 0;
1548         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1549         ops->var.vmode &= ~FB_VMODE_YWRAP;
1550         ops->update_start(info);
1551         fbcon_clear_margins(vc, 1);
1552         scrollback_max -= count;
1553         if (scrollback_max < 0)
1554                 scrollback_max = 0;
1555         scrollback_current = 0;
1556 }
1557
1558 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1559                                   long delta)
1560 {
1561         int count = vc->vc_rows;
1562         unsigned short *d, *s;
1563         unsigned long n;
1564         int line = 0;
1565
1566         d = (u16 *) softback_curr;
1567         if (d == (u16 *) softback_in)
1568                 d = (u16 *) vc->vc_origin;
1569         n = softback_curr + delta * vc->vc_size_row;
1570         softback_lines -= delta;
1571         if (delta < 0) {
1572                 if (softback_curr < softback_top && n < softback_buf) {
1573                         n += softback_end - softback_buf;
1574                         if (n < softback_top) {
1575                                 softback_lines -=
1576                                     (softback_top - n) / vc->vc_size_row;
1577                                 n = softback_top;
1578                         }
1579                 } else if (softback_curr >= softback_top
1580                            && n < softback_top) {
1581                         softback_lines -=
1582                             (softback_top - n) / vc->vc_size_row;
1583                         n = softback_top;
1584                 }
1585         } else {
1586                 if (softback_curr > softback_in && n >= softback_end) {
1587                         n += softback_buf - softback_end;
1588                         if (n > softback_in) {
1589                                 n = softback_in;
1590                                 softback_lines = 0;
1591                         }
1592                 } else if (softback_curr <= softback_in && n > softback_in) {
1593                         n = softback_in;
1594                         softback_lines = 0;
1595                 }
1596         }
1597         if (n == softback_curr)
1598                 return;
1599         softback_curr = n;
1600         s = (u16 *) softback_curr;
1601         if (s == (u16 *) softback_in)
1602                 s = (u16 *) vc->vc_origin;
1603         while (count--) {
1604                 unsigned short *start;
1605                 unsigned short *le;
1606                 unsigned short c;
1607                 int x = 0;
1608                 unsigned short attr = 1;
1609
1610                 start = s;
1611                 le = advance_row(s, 1);
1612                 do {
1613                         c = scr_readw(s);
1614                         if (attr != (c & 0xff00)) {
1615                                 attr = c & 0xff00;
1616                                 if (s > start) {
1617                                         fbcon_putcs(vc, start, s - start,
1618                                                     line, x);
1619                                         x += s - start;
1620                                         start = s;
1621                                 }
1622                         }
1623                         if (c == scr_readw(d)) {
1624                                 if (s > start) {
1625                                         fbcon_putcs(vc, start, s - start,
1626                                                     line, x);
1627                                         x += s - start + 1;
1628                                         start = s + 1;
1629                                 } else {
1630                                         x++;
1631                                         start++;
1632                                 }
1633                         }
1634                         s++;
1635                         d++;
1636                 } while (s < le);
1637                 if (s > start)
1638                         fbcon_putcs(vc, start, s - start, line, x);
1639                 line++;
1640                 if (d == (u16 *) softback_end)
1641                         d = (u16 *) softback_buf;
1642                 if (d == (u16 *) softback_in)
1643                         d = (u16 *) vc->vc_origin;
1644                 if (s == (u16 *) softback_end)
1645                         s = (u16 *) softback_buf;
1646                 if (s == (u16 *) softback_in)
1647                         s = (u16 *) vc->vc_origin;
1648         }
1649 }
1650
1651 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1652                               int line, int count, int dy)
1653 {
1654         unsigned short *s = (unsigned short *)
1655                 (vc->vc_origin + vc->vc_size_row * line);
1656
1657         while (count--) {
1658                 unsigned short *start = s;
1659                 unsigned short *le = advance_row(s, 1);
1660                 unsigned short c;
1661                 int x = 0;
1662                 unsigned short attr = 1;
1663
1664                 do {
1665                         c = scr_readw(s);
1666                         if (attr != (c & 0xff00)) {
1667                                 attr = c & 0xff00;
1668                                 if (s > start) {
1669                                         fbcon_putcs(vc, start, s - start,
1670                                                     dy, x);
1671                                         x += s - start;
1672                                         start = s;
1673                                 }
1674                         }
1675                         console_conditional_schedule();
1676                         s++;
1677                 } while (s < le);
1678                 if (s > start)
1679                         fbcon_putcs(vc, start, s - start, dy, x);
1680                 console_conditional_schedule();
1681                 dy++;
1682         }
1683 }
1684
1685 static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
1686                         struct display *p, int line, int count, int ycount)
1687 {
1688         int offset = ycount * vc->vc_cols;
1689         unsigned short *d = (unsigned short *)
1690             (vc->vc_origin + vc->vc_size_row * line);
1691         unsigned short *s = d + offset;
1692         struct fbcon_ops *ops = info->fbcon_par;
1693
1694         while (count--) {
1695                 unsigned short *start = s;
1696                 unsigned short *le = advance_row(s, 1);
1697                 unsigned short c;
1698                 int x = 0;
1699
1700                 do {
1701                         c = scr_readw(s);
1702
1703                         if (c == scr_readw(d)) {
1704                                 if (s > start) {
1705                                         ops->bmove(vc, info, line + ycount, x,
1706                                                    line, x, 1, s-start);
1707                                         x += s - start + 1;
1708                                         start = s + 1;
1709                                 } else {
1710                                         x++;
1711                                         start++;
1712                                 }
1713                         }
1714
1715                         scr_writew(c, d);
1716                         console_conditional_schedule();
1717                         s++;
1718                         d++;
1719                 } while (s < le);
1720                 if (s > start)
1721                         ops->bmove(vc, info, line + ycount, x, line, x, 1,
1722                                    s-start);
1723                 console_conditional_schedule();
1724                 if (ycount > 0)
1725                         line++;
1726                 else {
1727                         line--;
1728                         /* NOTE: We subtract two lines from these pointers */
1729                         s -= vc->vc_size_row;
1730                         d -= vc->vc_size_row;
1731                 }
1732         }
1733 }
1734
1735 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1736                          int line, int count, int offset)
1737 {
1738         unsigned short *d = (unsigned short *)
1739             (vc->vc_origin + vc->vc_size_row * line);
1740         unsigned short *s = d + offset;
1741
1742         while (count--) {
1743                 unsigned short *start = s;
1744                 unsigned short *le = advance_row(s, 1);
1745                 unsigned short c;
1746                 int x = 0;
1747                 unsigned short attr = 1;
1748
1749                 do {
1750                         c = scr_readw(s);
1751                         if (attr != (c & 0xff00)) {
1752                                 attr = c & 0xff00;
1753                                 if (s > start) {
1754                                         fbcon_putcs(vc, start, s - start,
1755                                                     line, x);
1756                                         x += s - start;
1757                                         start = s;
1758                                 }
1759                         }
1760                         if (c == scr_readw(d)) {
1761                                 if (s > start) {
1762                                         fbcon_putcs(vc, start, s - start,
1763                                                      line, x);
1764                                         x += s - start + 1;
1765                                         start = s + 1;
1766                                 } else {
1767                                         x++;
1768                                         start++;
1769                                 }
1770                         }
1771                         scr_writew(c, d);
1772                         console_conditional_schedule();
1773                         s++;
1774                         d++;
1775                 } while (s < le);
1776                 if (s > start)
1777                         fbcon_putcs(vc, start, s - start, line, x);
1778                 console_conditional_schedule();
1779                 if (offset > 0)
1780                         line++;
1781                 else {
1782                         line--;
1783                         /* NOTE: We subtract two lines from these pointers */
1784                         s -= vc->vc_size_row;
1785                         d -= vc->vc_size_row;
1786                 }
1787         }
1788 }
1789
1790 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1791                                        int count)
1792 {
1793         unsigned short *p;
1794
1795         if (vc->vc_num != fg_console)
1796                 return;
1797         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1798
1799         while (count) {
1800                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1801                 count--;
1802                 p = advance_row(p, 1);
1803                 softback_in += vc->vc_size_row;
1804                 if (softback_in == softback_end)
1805                         softback_in = softback_buf;
1806                 if (softback_in == softback_top) {
1807                         softback_top += vc->vc_size_row;
1808                         if (softback_top == softback_end)
1809                                 softback_top = softback_buf;
1810                 }
1811         }
1812         softback_curr = softback_in;
1813 }
1814
1815 static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
1816                 enum con_scroll dir, unsigned int count)
1817 {
1818         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1819         struct display *p = &fb_display[vc->vc_num];
1820         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1821
1822         if (fbcon_is_inactive(vc, info))
1823                 return true;
1824
1825         fbcon_cursor(vc, CM_ERASE);
1826
1827         /*
1828          * ++Geert: Only use ywrap/ypan if the console is in text mode
1829          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1830          *           whole screen (prevents flicker).
1831          */
1832
1833         switch (dir) {
1834         case SM_UP:
1835                 if (count > vc->vc_rows)        /* Maximum realistic size */
1836                         count = vc->vc_rows;
1837                 if (softback_top)
1838                         fbcon_softback_note(vc, t, count);
1839                 if (logo_shown >= 0)
1840                         goto redraw_up;
1841                 switch (p->scrollmode) {
1842                 case SCROLL_MOVE:
1843                         fbcon_redraw_blit(vc, info, p, t, b - t - count,
1844                                      count);
1845                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1846                         scr_memsetw((unsigned short *) (vc->vc_origin +
1847                                                         vc->vc_size_row *
1848                                                         (b - count)),
1849                                     vc->vc_video_erase_char,
1850                                     vc->vc_size_row * count);
1851                         return true;
1852                         break;
1853
1854                 case SCROLL_WRAP_MOVE:
1855                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1856                                 if (t > 0)
1857                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1858                                                     vc->vc_cols);
1859                                 ywrap_up(vc, count);
1860                                 if (vc->vc_rows - b > 0)
1861                                         fbcon_bmove(vc, b - count, 0, b, 0,
1862                                                     vc->vc_rows - b,
1863                                                     vc->vc_cols);
1864                         } else if (info->flags & FBINFO_READS_FAST)
1865                                 fbcon_bmove(vc, t + count, 0, t, 0,
1866                                             b - t - count, vc->vc_cols);
1867                         else
1868                                 goto redraw_up;
1869                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1870                         break;
1871
1872                 case SCROLL_PAN_REDRAW:
1873                         if ((p->yscroll + count <=
1874                              2 * (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 (t > 0)
1880                                         fbcon_redraw_move(vc, p, 0, t, count);
1881                                 ypan_up_redraw(vc, t, count);
1882                                 if (vc->vc_rows - b > 0)
1883                                         fbcon_redraw_move(vc, p, b,
1884                                                           vc->vc_rows - b, b);
1885                         } else
1886                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1887                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1888                         break;
1889
1890                 case SCROLL_PAN_MOVE:
1891                         if ((p->yscroll + count <=
1892                              2 * (p->vrows - vc->vc_rows))
1893                             && ((!scroll_partial && (b - t == vc->vc_rows))
1894                                 || (scroll_partial
1895                                     && (b - t - count >
1896                                         3 * vc->vc_rows >> 2)))) {
1897                                 if (t > 0)
1898                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1899                                                     vc->vc_cols);
1900                                 ypan_up(vc, count);
1901                                 if (vc->vc_rows - b > 0)
1902                                         fbcon_bmove(vc, b - count, 0, b, 0,
1903                                                     vc->vc_rows - b,
1904                                                     vc->vc_cols);
1905                         } else if (info->flags & FBINFO_READS_FAST)
1906                                 fbcon_bmove(vc, t + count, 0, t, 0,
1907                                             b - t - count, vc->vc_cols);
1908                         else
1909                                 goto redraw_up;
1910                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1911                         break;
1912
1913                 case SCROLL_REDRAW:
1914                       redraw_up:
1915                         fbcon_redraw(vc, p, t, b - t - count,
1916                                      count * vc->vc_cols);
1917                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1918                         scr_memsetw((unsigned short *) (vc->vc_origin +
1919                                                         vc->vc_size_row *
1920                                                         (b - count)),
1921                                     vc->vc_video_erase_char,
1922                                     vc->vc_size_row * count);
1923                         return true;
1924                 }
1925                 break;
1926
1927         case SM_DOWN:
1928                 if (count > vc->vc_rows)        /* Maximum realistic size */
1929                         count = vc->vc_rows;
1930                 if (logo_shown >= 0)
1931                         goto redraw_down;
1932                 switch (p->scrollmode) {
1933                 case SCROLL_MOVE:
1934                         fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
1935                                      -count);
1936                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1937                         scr_memsetw((unsigned short *) (vc->vc_origin +
1938                                                         vc->vc_size_row *
1939                                                         t),
1940                                     vc->vc_video_erase_char,
1941                                     vc->vc_size_row * count);
1942                         return true;
1943                         break;
1944
1945                 case SCROLL_WRAP_MOVE:
1946                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1947                                 if (vc->vc_rows - b > 0)
1948                                         fbcon_bmove(vc, b, 0, b - count, 0,
1949                                                     vc->vc_rows - b,
1950                                                     vc->vc_cols);
1951                                 ywrap_down(vc, count);
1952                                 if (t > 0)
1953                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1954                                                     vc->vc_cols);
1955                         } else if (info->flags & FBINFO_READS_FAST)
1956                                 fbcon_bmove(vc, t, 0, t + count, 0,
1957                                             b - t - count, vc->vc_cols);
1958                         else
1959                                 goto redraw_down;
1960                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1961                         break;
1962
1963                 case SCROLL_PAN_MOVE:
1964                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1965                             && ((!scroll_partial && (b - t == vc->vc_rows))
1966                                 || (scroll_partial
1967                                     && (b - t - count >
1968                                         3 * vc->vc_rows >> 2)))) {
1969                                 if (vc->vc_rows - b > 0)
1970                                         fbcon_bmove(vc, b, 0, b - count, 0,
1971                                                     vc->vc_rows - b,
1972                                                     vc->vc_cols);
1973                                 ypan_down(vc, count);
1974                                 if (t > 0)
1975                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1976                                                     vc->vc_cols);
1977                         } else if (info->flags & FBINFO_READS_FAST)
1978                                 fbcon_bmove(vc, t, 0, t + count, 0,
1979                                             b - t - count, vc->vc_cols);
1980                         else
1981                                 goto redraw_down;
1982                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1983                         break;
1984
1985                 case SCROLL_PAN_REDRAW:
1986                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1987                             && ((!scroll_partial && (b - t == vc->vc_rows))
1988                                 || (scroll_partial
1989                                     && (b - t - count >
1990                                         3 * vc->vc_rows >> 2)))) {
1991                                 if (vc->vc_rows - b > 0)
1992                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1993                                                           b - count);
1994                                 ypan_down_redraw(vc, t, count);
1995                                 if (t > 0)
1996                                         fbcon_redraw_move(vc, p, count, t, 0);
1997                         } else
1998                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1999                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
2000                         break;
2001
2002                 case SCROLL_REDRAW:
2003                       redraw_down:
2004                         fbcon_redraw(vc, p, b - 1, b - t - count,
2005                                      -count * vc->vc_cols);
2006                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
2007                         scr_memsetw((unsigned short *) (vc->vc_origin +
2008                                                         vc->vc_size_row *
2009                                                         t),
2010                                     vc->vc_video_erase_char,
2011                                     vc->vc_size_row * count);
2012                         return true;
2013                 }
2014         }
2015         return false;
2016 }
2017
2018
2019 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
2020                         int height, int width)
2021 {
2022         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2023         struct display *p = &fb_display[vc->vc_num];
2024
2025         if (fbcon_is_inactive(vc, info))
2026                 return;
2027
2028         if (!width || !height)
2029                 return;
2030
2031         /*  Split blits that cross physical y_wrap case.
2032          *  Pathological case involves 4 blits, better to use recursive
2033          *  code rather than unrolled case
2034          *
2035          *  Recursive invocations don't need to erase the cursor over and
2036          *  over again, so we use fbcon_bmove_rec()
2037          */
2038         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
2039                         p->vrows - p->yscroll);
2040 }
2041
2042 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
2043                             int dy, int dx, int height, int width, u_int y_break)
2044 {
2045         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2046         struct fbcon_ops *ops = info->fbcon_par;
2047         u_int b;
2048
2049         if (sy < y_break && sy + height > y_break) {
2050                 b = y_break - sy;
2051                 if (dy < sy) {  /* Avoid trashing self */
2052                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2053                                         y_break);
2054                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2055                                         height - b, width, y_break);
2056                 } else {
2057                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2058                                         height - b, width, y_break);
2059                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2060                                         y_break);
2061                 }
2062                 return;
2063         }
2064
2065         if (dy < y_break && dy + height > y_break) {
2066                 b = y_break - dy;
2067                 if (dy < sy) {  /* Avoid trashing self */
2068                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2069                                         y_break);
2070                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2071                                         height - b, width, y_break);
2072                 } else {
2073                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2074                                         height - b, width, y_break);
2075                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2076                                         y_break);
2077                 }
2078                 return;
2079         }
2080         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
2081                    height, width);
2082 }
2083
2084 static void updatescrollmode(struct display *p,
2085                                         struct fb_info *info,
2086                                         struct vc_data *vc)
2087 {
2088         struct fbcon_ops *ops = info->fbcon_par;
2089         int fh = vc->vc_font.height;
2090         int cap = info->flags;
2091         u16 t = 0;
2092         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
2093                                   info->fix.xpanstep);
2094         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
2095         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2096         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
2097                                    info->var.xres_virtual);
2098         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
2099                 divides(ypan, vc->vc_font.height) && vyres > yres;
2100         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
2101                 divides(ywrap, vc->vc_font.height) &&
2102                 divides(vc->vc_font.height, vyres) &&
2103                 divides(vc->vc_font.height, yres);
2104         int reading_fast = cap & FBINFO_READS_FAST;
2105         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
2106                 !(cap & FBINFO_HWACCEL_DISABLED);
2107         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
2108                 !(cap & FBINFO_HWACCEL_DISABLED);
2109
2110         p->vrows = vyres/fh;
2111         if (yres > (fh * (vc->vc_rows + 1)))
2112                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
2113         if ((yres % fh) && (vyres % fh < yres % fh))
2114                 p->vrows--;
2115
2116         if (good_wrap || good_pan) {
2117                 if (reading_fast || fast_copyarea)
2118                         p->scrollmode = good_wrap ?
2119                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
2120                 else
2121                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
2122                                 SCROLL_PAN_REDRAW;
2123         } else {
2124                 if (reading_fast || (fast_copyarea && !fast_imageblit))
2125                         p->scrollmode = SCROLL_MOVE;
2126                 else
2127                         p->scrollmode = SCROLL_REDRAW;
2128         }
2129 }
2130
2131 static int fbcon_resize(struct vc_data *vc, unsigned int width,
2132                         unsigned int height, unsigned int user)
2133 {
2134         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2135         struct fbcon_ops *ops = info->fbcon_par;
2136         struct display *p = &fb_display[vc->vc_num];
2137         struct fb_var_screeninfo var = info->var;
2138         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2139
2140         virt_w = FBCON_SWAP(ops->rotate, width, height);
2141         virt_h = FBCON_SWAP(ops->rotate, height, width);
2142         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2143                                  vc->vc_font.height);
2144         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2145                                  vc->vc_font.width);
2146         var.xres = virt_w * virt_fw;
2147         var.yres = virt_h * virt_fh;
2148         x_diff = info->var.xres - var.xres;
2149         y_diff = info->var.yres - var.yres;
2150         if (x_diff < 0 || x_diff > virt_fw ||
2151             y_diff < 0 || y_diff > virt_fh) {
2152                 const struct fb_videomode *mode;
2153
2154                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2155                 mode = fb_find_best_mode(&var, &info->modelist);
2156                 if (mode == NULL)
2157                         return -EINVAL;
2158                 display_to_var(&var, p);
2159                 fb_videomode_to_var(&var, mode);
2160
2161                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2162                         return -EINVAL;
2163
2164                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2165                 if (con_is_visible(vc)) {
2166                         var.activate = FB_ACTIVATE_NOW |
2167                                 FB_ACTIVATE_FORCE;
2168                         fb_set_var(info, &var);
2169                 }
2170                 var_to_display(p, &info->var, info);
2171                 ops->var = info->var;
2172         }
2173         updatescrollmode(p, info, vc);
2174         return 0;
2175 }
2176
2177 static int fbcon_switch(struct vc_data *vc)
2178 {
2179         struct fb_info *info, *old_info = NULL;
2180         struct fbcon_ops *ops;
2181         struct display *p = &fb_display[vc->vc_num];
2182         struct fb_var_screeninfo var;
2183         int i, ret, prev_console, charcnt = 256;
2184
2185         info = registered_fb[con2fb_map[vc->vc_num]];
2186         ops = info->fbcon_par;
2187
2188         if (softback_top) {
2189                 if (softback_lines)
2190                         fbcon_set_origin(vc);
2191                 softback_top = softback_curr = softback_in = softback_buf;
2192                 softback_lines = 0;
2193                 fbcon_update_softback(vc);
2194         }
2195
2196         if (logo_shown >= 0) {
2197                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2198
2199                 if (conp2->vc_top == logo_lines
2200                     && conp2->vc_bottom == conp2->vc_rows)
2201                         conp2->vc_top = 0;
2202                 logo_shown = FBCON_LOGO_CANSHOW;
2203         }
2204
2205         prev_console = ops->currcon;
2206         if (prev_console != -1)
2207                 old_info = registered_fb[con2fb_map[prev_console]];
2208         /*
2209          * FIXME: If we have multiple fbdev's loaded, we need to
2210          * update all info->currcon.  Perhaps, we can place this
2211          * in a centralized structure, but this might break some
2212          * drivers.
2213          *
2214          * info->currcon = vc->vc_num;
2215          */
2216         for (i = 0; i < FB_MAX; i++) {
2217                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2218                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2219
2220                         o->currcon = vc->vc_num;
2221                 }
2222         }
2223         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2224         display_to_var(&var, p);
2225         var.activate = FB_ACTIVATE_NOW;
2226
2227         /*
2228          * make sure we don't unnecessarily trip the memcmp()
2229          * in fb_set_var()
2230          */
2231         info->var.activate = var.activate;
2232         var.vmode |= info->var.vmode & ~FB_VMODE_MASK;
2233         fb_set_var(info, &var);
2234         ops->var = info->var;
2235
2236         if (old_info != NULL && (old_info != info ||
2237                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2238                 if (info->fbops->fb_set_par) {
2239                         ret = info->fbops->fb_set_par(info);
2240
2241                         if (ret)
2242                                 printk(KERN_ERR "fbcon_switch: detected "
2243                                         "unhandled fb_set_par error, "
2244                                         "error code %d\n", ret);
2245                 }
2246
2247                 if (old_info != info)
2248                         fbcon_del_cursor_timer(old_info);
2249         }
2250
2251         if (fbcon_is_inactive(vc, info) ||
2252             ops->blank_state != FB_BLANK_UNBLANK)
2253                 fbcon_del_cursor_timer(info);
2254         else
2255                 fbcon_add_cursor_timer(info);
2256
2257         set_blitting_type(vc, info);
2258         ops->cursor_reset = 1;
2259
2260         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2261                 ops->rotate = FB_ROTATE_UR;
2262                 set_blitting_type(vc, info);
2263         }
2264
2265         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2266         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2267
2268         if (p->userfont)
2269                 charcnt = FNTCHARCNT(vc->vc_font.data);
2270
2271         if (charcnt > 256)
2272                 vc->vc_complement_mask <<= 1;
2273
2274         updatescrollmode(p, info, vc);
2275
2276         switch (p->scrollmode) {
2277         case SCROLL_WRAP_MOVE:
2278                 scrollback_phys_max = p->vrows - vc->vc_rows;
2279                 break;
2280         case SCROLL_PAN_MOVE:
2281         case SCROLL_PAN_REDRAW:
2282                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2283                 if (scrollback_phys_max < 0)
2284                         scrollback_phys_max = 0;
2285                 break;
2286         default:
2287                 scrollback_phys_max = 0;
2288                 break;
2289         }
2290
2291         scrollback_max = 0;
2292         scrollback_current = 0;
2293
2294         if (!fbcon_is_inactive(vc, info)) {
2295             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2296             ops->update_start(info);
2297         }
2298
2299         fbcon_set_palette(vc, color_table);
2300         fbcon_clear_margins(vc, 0);
2301
2302         if (logo_shown == FBCON_LOGO_DRAW) {
2303
2304                 logo_shown = fg_console;
2305                 /* This is protected above by initmem_freed */
2306                 fb_show_logo(info, ops->rotate);
2307                 update_region(vc,
2308                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2309                               vc->vc_size_row * (vc->vc_bottom -
2310                                                  vc->vc_top) / 2);
2311                 return 0;
2312         }
2313         return 1;
2314 }
2315
2316 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2317                                 int blank)
2318 {
2319         struct fb_event event;
2320
2321         if (blank) {
2322                 unsigned short charmask = vc->vc_hi_font_mask ?
2323                         0x1ff : 0xff;
2324                 unsigned short oldc;
2325
2326                 oldc = vc->vc_video_erase_char;
2327                 vc->vc_video_erase_char &= charmask;
2328                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2329                 vc->vc_video_erase_char = oldc;
2330         }
2331
2332
2333         if (!lock_fb_info(info))
2334                 return;
2335         event.info = info;
2336         event.data = &blank;
2337         fb_notifier_call_chain(FB_EVENT_CONBLANK, &event);
2338         unlock_fb_info(info);
2339 }
2340
2341 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2342 {
2343         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2344         struct fbcon_ops *ops = info->fbcon_par;
2345
2346         if (mode_switch) {
2347                 struct fb_var_screeninfo var = info->var;
2348
2349                 ops->graphics = 1;
2350
2351                 if (!blank) {
2352                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2353                         fb_set_var(info, &var);
2354                         ops->graphics = 0;
2355                         ops->var = info->var;
2356                 }
2357         }
2358
2359         if (!fbcon_is_inactive(vc, info)) {
2360                 if (ops->blank_state != blank) {
2361                         ops->blank_state = blank;
2362                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2363                         ops->cursor_flash = (!blank);
2364
2365                         if (!(info->flags & FBINFO_MISC_USEREVENT))
2366                                 if (fb_blank(info, blank))
2367                                         fbcon_generic_blank(vc, info, blank);
2368                 }
2369
2370                 if (!blank)
2371                         update_screen(vc);
2372         }
2373
2374         if (mode_switch || fbcon_is_inactive(vc, info) ||
2375             ops->blank_state != FB_BLANK_UNBLANK)
2376                 fbcon_del_cursor_timer(info);
2377         else
2378                 fbcon_add_cursor_timer(info);
2379
2380         return 0;
2381 }
2382
2383 static int fbcon_debug_enter(struct vc_data *vc)
2384 {
2385         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2386         struct fbcon_ops *ops = info->fbcon_par;
2387
2388         ops->save_graphics = ops->graphics;
2389         ops->graphics = 0;
2390         if (info->fbops->fb_debug_enter)
2391                 info->fbops->fb_debug_enter(info);
2392         fbcon_set_palette(vc, color_table);
2393         return 0;
2394 }
2395
2396 static int fbcon_debug_leave(struct vc_data *vc)
2397 {
2398         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2399         struct fbcon_ops *ops = info->fbcon_par;
2400
2401         ops->graphics = ops->save_graphics;
2402         if (info->fbops->fb_debug_leave)
2403                 info->fbops->fb_debug_leave(info);
2404         return 0;
2405 }
2406
2407 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2408 {
2409         u8 *fontdata = vc->vc_font.data;
2410         u8 *data = font->data;
2411         int i, j;
2412
2413         font->width = vc->vc_font.width;
2414         font->height = vc->vc_font.height;
2415         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2416         if (!font->data)
2417                 return 0;
2418
2419         if (font->width <= 8) {
2420                 j = vc->vc_font.height;
2421                 for (i = 0; i < font->charcount; i++) {
2422                         memcpy(data, fontdata, j);
2423                         memset(data + j, 0, 32 - j);
2424                         data += 32;
2425                         fontdata += j;
2426                 }
2427         } else if (font->width <= 16) {
2428                 j = vc->vc_font.height * 2;
2429                 for (i = 0; i < font->charcount; i++) {
2430                         memcpy(data, fontdata, j);
2431                         memset(data + j, 0, 64 - j);
2432                         data += 64;
2433                         fontdata += j;
2434                 }
2435         } else if (font->width <= 24) {
2436                 for (i = 0; i < font->charcount; i++) {
2437                         for (j = 0; j < vc->vc_font.height; j++) {
2438                                 *data++ = fontdata[0];
2439                                 *data++ = fontdata[1];
2440                                 *data++ = fontdata[2];
2441                                 fontdata += sizeof(u32);
2442                         }
2443                         memset(data, 0, 3 * (32 - j));
2444                         data += 3 * (32 - j);
2445                 }
2446         } else {
2447                 j = vc->vc_font.height * 4;
2448                 for (i = 0; i < font->charcount; i++) {
2449                         memcpy(data, fontdata, j);
2450                         memset(data + j, 0, 128 - j);
2451                         data += 128;
2452                         fontdata += j;
2453                 }
2454         }
2455         return 0;
2456 }
2457
2458 /* set/clear vc_hi_font_mask and update vc attrs accordingly */
2459 static void set_vc_hi_font(struct vc_data *vc, bool set)
2460 {
2461         if (!set) {
2462                 vc->vc_hi_font_mask = 0;
2463                 if (vc->vc_can_do_color) {
2464                         vc->vc_complement_mask >>= 1;
2465                         vc->vc_s_complement_mask >>= 1;
2466                 }
2467
2468                 /* ++Edmund: reorder the attribute bits */
2469                 if (vc->vc_can_do_color) {
2470                         unsigned short *cp =
2471                             (unsigned short *) vc->vc_origin;
2472                         int count = vc->vc_screenbuf_size / 2;
2473                         unsigned short c;
2474                         for (; count > 0; count--, cp++) {
2475                                 c = scr_readw(cp);
2476                                 scr_writew(((c & 0xfe00) >> 1) |
2477                                            (c & 0xff), cp);
2478                         }
2479                         c = vc->vc_video_erase_char;
2480                         vc->vc_video_erase_char =
2481                             ((c & 0xfe00) >> 1) | (c & 0xff);
2482                         vc->vc_attr >>= 1;
2483                 }
2484         } else {
2485                 vc->vc_hi_font_mask = 0x100;
2486                 if (vc->vc_can_do_color) {
2487                         vc->vc_complement_mask <<= 1;
2488                         vc->vc_s_complement_mask <<= 1;
2489                 }
2490
2491                 /* ++Edmund: reorder the attribute bits */
2492                 {
2493                         unsigned short *cp =
2494                             (unsigned short *) vc->vc_origin;
2495                         int count = vc->vc_screenbuf_size / 2;
2496                         unsigned short c;
2497                         for (; count > 0; count--, cp++) {
2498                                 unsigned short newc;
2499                                 c = scr_readw(cp);
2500                                 if (vc->vc_can_do_color)
2501                                         newc =
2502                                             ((c & 0xff00) << 1) | (c &
2503                                                                    0xff);
2504                                 else
2505                                         newc = c & ~0x100;
2506                                 scr_writew(newc, cp);
2507                         }
2508                         c = vc->vc_video_erase_char;
2509                         if (vc->vc_can_do_color) {
2510                                 vc->vc_video_erase_char =
2511                                     ((c & 0xff00) << 1) | (c & 0xff);
2512                                 vc->vc_attr <<= 1;
2513                         } else
2514                                 vc->vc_video_erase_char = c & ~0x100;
2515                 }
2516         }
2517 }
2518
2519 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2520                              const u8 * data, int userfont)
2521 {
2522         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2523         struct fbcon_ops *ops = info->fbcon_par;
2524         struct display *p = &fb_display[vc->vc_num];
2525         int resize;
2526         int cnt;
2527         char *old_data = NULL;
2528
2529         if (con_is_visible(vc) && softback_lines)
2530                 fbcon_set_origin(vc);
2531
2532         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2533         if (p->userfont)
2534                 old_data = vc->vc_font.data;
2535         if (userfont)
2536                 cnt = FNTCHARCNT(data);
2537         else
2538                 cnt = 256;
2539         vc->vc_font.data = (void *)(p->fontdata = data);
2540         if ((p->userfont = userfont))
2541                 REFCOUNT(data)++;
2542         vc->vc_font.width = w;
2543         vc->vc_font.height = h;
2544         if (vc->vc_hi_font_mask && cnt == 256)
2545                 set_vc_hi_font(vc, false);
2546         else if (!vc->vc_hi_font_mask && cnt == 512)
2547                 set_vc_hi_font(vc, true);
2548
2549         if (resize) {
2550                 int cols, rows;
2551
2552                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2553                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2554                 cols /= w;
2555                 rows /= h;
2556                 vc_resize(vc, cols, rows);
2557                 if (con_is_visible(vc) && softback_buf)
2558                         fbcon_update_softback(vc);
2559         } else if (con_is_visible(vc)
2560                    && vc->vc_mode == KD_TEXT) {
2561                 fbcon_clear_margins(vc, 0);
2562                 update_screen(vc);
2563         }
2564
2565         if (old_data && (--REFCOUNT(old_data) == 0))
2566                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2567         return 0;
2568 }
2569
2570 static int fbcon_copy_font(struct vc_data *vc, int con)
2571 {
2572         struct display *od = &fb_display[con];
2573         struct console_font *f = &vc->vc_font;
2574
2575         if (od->fontdata == f->data)
2576                 return 0;       /* already the same font... */
2577         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2578 }
2579
2580 /*
2581  *  User asked to set font; we are guaranteed that
2582  *      a) width and height are in range 1..32
2583  *      b) charcount does not exceed 512
2584  *  but lets not assume that, since someone might someday want to use larger
2585  *  fonts. And charcount of 512 is small for unicode support.
2586  *
2587  *  However, user space gives the font in 32 rows , regardless of
2588  *  actual font height. So a new API is needed if support for larger fonts
2589  *  is ever implemented.
2590  */
2591
2592 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2593 {
2594         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2595         unsigned charcount = font->charcount;
2596         int w = font->width;
2597         int h = font->height;
2598         int size;
2599         int i, csum;
2600         u8 *new_data, *data = font->data;
2601         int pitch = (font->width+7) >> 3;
2602
2603         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2604          * If not this check should be changed to charcount < 256 */
2605         if (charcount != 256 && charcount != 512)
2606                 return -EINVAL;
2607
2608         /* Make sure drawing engine can handle the font */
2609         if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
2610             !(info->pixmap.blit_y & (1 << (font->height - 1))))
2611                 return -EINVAL;
2612
2613         /* Make sure driver can handle the font length */
2614         if (fbcon_invalid_charcount(info, charcount))
2615                 return -EINVAL;
2616
2617         size = h * pitch * charcount;
2618
2619         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2620
2621         if (!new_data)
2622                 return -ENOMEM;
2623
2624         new_data += FONT_EXTRA_WORDS * sizeof(int);
2625         FNTSIZE(new_data) = size;
2626         FNTCHARCNT(new_data) = charcount;
2627         REFCOUNT(new_data) = 0; /* usage counter */
2628         for (i=0; i< charcount; i++) {
2629                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2630         }
2631
2632         /* Since linux has a nice crc32 function use it for counting font
2633          * checksums. */
2634         csum = crc32(0, new_data, size);
2635
2636         FNTSUM(new_data) = csum;
2637         /* Check if the same font is on some other console already */
2638         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2639                 struct vc_data *tmp = vc_cons[i].d;
2640
2641                 if (fb_display[i].userfont &&
2642                     fb_display[i].fontdata &&
2643                     FNTSUM(fb_display[i].fontdata) == csum &&
2644                     FNTSIZE(fb_display[i].fontdata) == size &&
2645                     tmp->vc_font.width == w &&
2646                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2647                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2648                         new_data = (u8 *)fb_display[i].fontdata;
2649                         break;
2650                 }
2651         }
2652         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2653 }
2654
2655 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2656 {
2657         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2658         const struct font_desc *f;
2659
2660         if (!name)
2661                 f = get_default_font(info->var.xres, info->var.yres,
2662                                      info->pixmap.blit_x, info->pixmap.blit_y);
2663         else if (!(f = find_font(name)))
2664                 return -ENOENT;
2665
2666         font->width = f->width;
2667         font->height = f->height;
2668         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2669 }
2670
2671 static u16 palette_red[16];
2672 static u16 palette_green[16];
2673 static u16 palette_blue[16];
2674
2675 static struct fb_cmap palette_cmap = {
2676         0, 16, palette_red, palette_green, palette_blue, NULL
2677 };
2678
2679 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table)
2680 {
2681         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2682         int i, j, k, depth;
2683         u8 val;
2684
2685         if (fbcon_is_inactive(vc, info))
2686                 return;
2687
2688         if (!con_is_visible(vc))
2689                 return;
2690
2691         depth = fb_get_color_depth(&info->var, &info->fix);
2692         if (depth > 3) {
2693                 for (i = j = 0; i < 16; i++) {
2694                         k = table[i];
2695                         val = vc->vc_palette[j++];
2696                         palette_red[k] = (val << 8) | val;
2697                         val = vc->vc_palette[j++];
2698                         palette_green[k] = (val << 8) | val;
2699                         val = vc->vc_palette[j++];
2700                         palette_blue[k] = (val << 8) | val;
2701                 }
2702                 palette_cmap.len = 16;
2703                 palette_cmap.start = 0;
2704         /*
2705          * If framebuffer is capable of less than 16 colors,
2706          * use default palette of fbcon.
2707          */
2708         } else
2709                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2710
2711         fb_set_cmap(&palette_cmap, info);
2712 }
2713
2714 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2715 {
2716         unsigned long p;
2717         int line;
2718
2719         if (vc->vc_num != fg_console || !softback_lines)
2720                 return (u16 *) (vc->vc_origin + offset);
2721         line = offset / vc->vc_size_row;
2722         if (line >= softback_lines)
2723                 return (u16 *) (vc->vc_origin + offset -
2724                                 softback_lines * vc->vc_size_row);
2725         p = softback_curr + offset;
2726         if (p >= softback_end)
2727                 p += softback_buf - softback_end;
2728         return (u16 *) p;
2729 }
2730
2731 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2732                                  int *px, int *py)
2733 {
2734         unsigned long ret;
2735         int x, y;
2736
2737         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2738                 unsigned long offset = (pos - vc->vc_origin) / 2;
2739
2740                 x = offset % vc->vc_cols;
2741                 y = offset / vc->vc_cols;
2742                 if (vc->vc_num == fg_console)
2743                         y += softback_lines;
2744                 ret = pos + (vc->vc_cols - x) * 2;
2745         } else if (vc->vc_num == fg_console && softback_lines) {
2746                 unsigned long offset = pos - softback_curr;
2747
2748                 if (pos < softback_curr)
2749                         offset += softback_end - softback_buf;
2750                 offset /= 2;
2751                 x = offset % vc->vc_cols;
2752                 y = offset / vc->vc_cols;
2753                 ret = pos + (vc->vc_cols - x) * 2;
2754                 if (ret == softback_end)
2755                         ret = softback_buf;
2756                 if (ret == softback_in)
2757                         ret = vc->vc_origin;
2758         } else {
2759                 /* Should not happen */
2760                 x = y = 0;
2761                 ret = vc->vc_origin;
2762         }
2763         if (px)
2764                 *px = x;
2765         if (py)
2766                 *py = y;
2767         return ret;
2768 }
2769
2770 /* As we might be inside of softback, we may work with non-contiguous buffer,
2771    that's why we have to use a separate routine. */
2772 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2773 {
2774         while (cnt--) {
2775                 u16 a = scr_readw(p);
2776                 if (!vc->vc_can_do_color)
2777                         a ^= 0x0800;
2778                 else if (vc->vc_hi_font_mask == 0x100)
2779                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2780                             (((a) & 0x0e00) << 4);
2781                 else
2782                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2783                             (((a) & 0x0700) << 4);
2784                 scr_writew(a, p++);
2785                 if (p == (u16 *) softback_end)
2786                         p = (u16 *) softback_buf;
2787                 if (p == (u16 *) softback_in)
2788                         p = (u16 *) vc->vc_origin;
2789         }
2790 }
2791
2792 static void fbcon_scrolldelta(struct vc_data *vc, int lines)
2793 {
2794         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2795         struct fbcon_ops *ops = info->fbcon_par;
2796         struct display *disp = &fb_display[fg_console];
2797         int offset, limit, scrollback_old;
2798
2799         if (softback_top) {
2800                 if (vc->vc_num != fg_console)
2801                         return;
2802                 if (vc->vc_mode != KD_TEXT || !lines)
2803                         return;
2804                 if (logo_shown >= 0) {
2805                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2806
2807                         if (conp2->vc_top == logo_lines
2808                             && conp2->vc_bottom == conp2->vc_rows)
2809                                 conp2->vc_top = 0;
2810                         if (logo_shown == vc->vc_num) {
2811                                 unsigned long p, q;
2812                                 int i;
2813
2814                                 p = softback_in;
2815                                 q = vc->vc_origin +
2816                                     logo_lines * vc->vc_size_row;
2817                                 for (i = 0; i < logo_lines; i++) {
2818                                         if (p == softback_top)
2819                                                 break;
2820                                         if (p == softback_buf)
2821                                                 p = softback_end;
2822                                         p -= vc->vc_size_row;
2823                                         q -= vc->vc_size_row;
2824                                         scr_memcpyw((u16 *) q, (u16 *) p,
2825                                                     vc->vc_size_row);
2826                                 }
2827                                 softback_in = softback_curr = p;
2828                                 update_region(vc, vc->vc_origin,
2829                                               logo_lines * vc->vc_cols);
2830                         }
2831                         logo_shown = FBCON_LOGO_CANSHOW;
2832                 }
2833                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2834                 fbcon_redraw_softback(vc, disp, lines);
2835                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2836                 return;
2837         }
2838
2839         if (!scrollback_phys_max)
2840                 return;
2841
2842         scrollback_old = scrollback_current;
2843         scrollback_current -= lines;
2844         if (scrollback_current < 0)
2845                 scrollback_current = 0;
2846         else if (scrollback_current > scrollback_max)
2847                 scrollback_current = scrollback_max;
2848         if (scrollback_current == scrollback_old)
2849                 return;
2850
2851         if (fbcon_is_inactive(vc, info))
2852                 return;
2853
2854         fbcon_cursor(vc, CM_ERASE);
2855
2856         offset = disp->yscroll - scrollback_current;
2857         limit = disp->vrows;
2858         switch (disp->scrollmode) {
2859         case SCROLL_WRAP_MOVE:
2860                 info->var.vmode |= FB_VMODE_YWRAP;
2861                 break;
2862         case SCROLL_PAN_MOVE:
2863         case SCROLL_PAN_REDRAW:
2864                 limit -= vc->vc_rows;
2865                 info->var.vmode &= ~FB_VMODE_YWRAP;
2866                 break;
2867         }
2868         if (offset < 0)
2869                 offset += limit;
2870         else if (offset >= limit)
2871                 offset -= limit;
2872
2873         ops->var.xoffset = 0;
2874         ops->var.yoffset = offset * vc->vc_font.height;
2875         ops->update_start(info);
2876
2877         if (!scrollback_current)
2878                 fbcon_cursor(vc, CM_DRAW);
2879 }
2880
2881 static int fbcon_set_origin(struct vc_data *vc)
2882 {
2883         if (softback_lines)
2884                 fbcon_scrolldelta(vc, softback_lines);
2885         return 0;
2886 }
2887
2888 static void fbcon_suspended(struct fb_info *info)
2889 {
2890         struct vc_data *vc = NULL;
2891         struct fbcon_ops *ops = info->fbcon_par;
2892
2893         if (!ops || ops->currcon < 0)
2894                 return;
2895         vc = vc_cons[ops->currcon].d;
2896
2897         /* Clear cursor, restore saved data */
2898         fbcon_cursor(vc, CM_ERASE);
2899 }
2900
2901 static void fbcon_resumed(struct fb_info *info)
2902 {
2903         struct vc_data *vc;
2904         struct fbcon_ops *ops = info->fbcon_par;
2905
2906         if (!ops || ops->currcon < 0)
2907                 return;
2908         vc = vc_cons[ops->currcon].d;
2909
2910         update_screen(vc);
2911 }
2912
2913 static void fbcon_modechanged(struct fb_info *info)
2914 {
2915         struct fbcon_ops *ops = info->fbcon_par;
2916         struct vc_data *vc;
2917         struct display *p;
2918         int rows, cols;
2919
2920         if (!ops || ops->currcon < 0)
2921                 return;
2922         vc = vc_cons[ops->currcon].d;
2923         if (vc->vc_mode != KD_TEXT ||
2924             registered_fb[con2fb_map[ops->currcon]] != info)
2925                 return;
2926
2927         p = &fb_display[vc->vc_num];
2928         set_blitting_type(vc, info);
2929
2930         if (con_is_visible(vc)) {
2931                 var_to_display(p, &info->var, info);
2932                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2933                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2934                 cols /= vc->vc_font.width;
2935                 rows /= vc->vc_font.height;
2936                 vc_resize(vc, cols, rows);
2937                 updatescrollmode(p, info, vc);
2938                 scrollback_max = 0;
2939                 scrollback_current = 0;
2940
2941                 if (!fbcon_is_inactive(vc, info)) {
2942                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2943                     ops->update_start(info);
2944                 }
2945
2946                 fbcon_set_palette(vc, color_table);
2947                 update_screen(vc);
2948                 if (softback_buf)
2949                         fbcon_update_softback(vc);
2950         }
2951 }
2952
2953 static void fbcon_set_all_vcs(struct fb_info *info)
2954 {
2955         struct fbcon_ops *ops = info->fbcon_par;
2956         struct vc_data *vc;
2957         struct display *p;
2958         int i, rows, cols, fg = -1;
2959
2960         if (!ops || ops->currcon < 0)
2961                 return;
2962
2963         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2964                 vc = vc_cons[i].d;
2965                 if (!vc || vc->vc_mode != KD_TEXT ||
2966                     registered_fb[con2fb_map[i]] != info)
2967                         continue;
2968
2969                 if (con_is_visible(vc)) {
2970                         fg = i;
2971                         continue;
2972                 }
2973
2974                 p = &fb_display[vc->vc_num];
2975                 set_blitting_type(vc, info);
2976                 var_to_display(p, &info->var, info);
2977                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2978                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2979                 cols /= vc->vc_font.width;
2980                 rows /= vc->vc_font.height;
2981                 vc_resize(vc, cols, rows);
2982         }
2983
2984         if (fg != -1)
2985                 fbcon_modechanged(info);
2986 }
2987
2988 static int fbcon_mode_deleted(struct fb_info *info,
2989                               struct fb_videomode *mode)
2990 {
2991         struct fb_info *fb_info;
2992         struct display *p;
2993         int i, j, found = 0;
2994
2995         /* before deletion, ensure that mode is not in use */
2996         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2997                 j = con2fb_map[i];
2998                 if (j == -1)
2999                         continue;
3000                 fb_info = registered_fb[j];
3001                 if (fb_info != info)
3002                         continue;
3003                 p = &fb_display[i];
3004                 if (!p || !p->mode)
3005                         continue;
3006                 if (fb_mode_is_equal(p->mode, mode)) {
3007                         found = 1;
3008                         break;
3009                 }
3010         }
3011         return found;
3012 }
3013
3014 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3015 static int fbcon_unbind(void)
3016 {
3017         int ret;
3018
3019         ret = do_unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
3020                                 fbcon_is_default);
3021
3022         if (!ret)
3023                 fbcon_has_console_bind = 0;
3024
3025         return ret;
3026 }
3027 #else
3028 static inline int fbcon_unbind(void)
3029 {
3030         return -EINVAL;
3031 }
3032 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3033
3034 /* called with console_lock held */
3035 static int fbcon_fb_unbind(int idx)
3036 {
3037         int i, new_idx = -1, ret = 0;
3038
3039         if (!fbcon_has_console_bind)
3040                 return 0;
3041
3042         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3043                 if (con2fb_map[i] != idx &&
3044                     con2fb_map[i] != -1) {
3045                         new_idx = i;
3046                         break;
3047                 }
3048         }
3049
3050         if (new_idx != -1) {
3051                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3052                         if (con2fb_map[i] == idx)
3053                                 set_con2fb_map(i, new_idx, 0);
3054                 }
3055         } else {
3056                 struct fb_info *info = registered_fb[idx];
3057
3058                 /* This is sort of like set_con2fb_map, except it maps
3059                  * the consoles to no device and then releases the
3060                  * oldinfo to free memory and cancel the cursor blink
3061                  * timer. I can imagine this just becoming part of
3062                  * set_con2fb_map where new_idx is -1
3063                  */
3064                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3065                         if (con2fb_map[i] == idx) {
3066                                 con2fb_map[i] = -1;
3067                                 if (!search_fb_in_map(idx)) {
3068                                         ret = con2fb_release_oldinfo(vc_cons[i].d,
3069                                                                      info, NULL, i,
3070                                                                      idx, 0);
3071                                         if (ret) {
3072                                                 con2fb_map[i] = idx;
3073                                                 return ret;
3074                                         }
3075                                 }
3076                         }
3077                 }
3078                 ret = fbcon_unbind();
3079         }
3080
3081         return ret;
3082 }
3083
3084 /* called with console_lock held */
3085 static int fbcon_fb_unregistered(struct fb_info *info)
3086 {
3087         int i, idx;
3088
3089         idx = info->node;
3090         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3091                 if (con2fb_map[i] == idx)
3092                         con2fb_map[i] = -1;
3093         }
3094
3095         if (idx == info_idx) {
3096                 info_idx = -1;
3097
3098                 for (i = 0; i < FB_MAX; i++) {
3099                         if (registered_fb[i] != NULL) {
3100                                 info_idx = i;
3101                                 break;
3102                         }
3103                 }
3104         }
3105
3106         if (info_idx != -1) {
3107                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3108                         if (con2fb_map[i] == -1)
3109                                 con2fb_map[i] = info_idx;
3110                 }
3111         }
3112
3113         if (primary_device == idx)
3114                 primary_device = -1;
3115
3116         if (!num_registered_fb)
3117                 do_unregister_con_driver(&fb_con);
3118
3119         return 0;
3120 }
3121
3122 /* called with console_lock held */
3123 static void fbcon_remap_all(int idx)
3124 {
3125         int i;
3126         for (i = first_fb_vc; i <= last_fb_vc; i++)
3127                 set_con2fb_map(i, idx, 0);
3128
3129         if (con_is_bound(&fb_con)) {
3130                 printk(KERN_INFO "fbcon: Remapping primary device, "
3131                        "fb%i, to tty %i-%i\n", idx,
3132                        first_fb_vc + 1, last_fb_vc + 1);
3133                 info_idx = idx;
3134         }
3135 }
3136
3137 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
3138 static void fbcon_select_primary(struct fb_info *info)
3139 {
3140         if (!map_override && primary_device == -1 &&
3141             fb_is_primary_device(info)) {
3142                 int i;
3143
3144                 printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
3145                        info->fix.id, info->node);
3146                 primary_device = info->node;
3147
3148                 for (i = first_fb_vc; i <= last_fb_vc; i++)
3149                         con2fb_map_boot[i] = primary_device;
3150
3151                 if (con_is_bound(&fb_con)) {
3152                         printk(KERN_INFO "fbcon: Remapping primary device, "
3153                                "fb%i, to tty %i-%i\n", info->node,
3154                                first_fb_vc + 1, last_fb_vc + 1);
3155                         info_idx = primary_device;
3156                 }
3157         }
3158
3159 }
3160 #else
3161 static inline void fbcon_select_primary(struct fb_info *info)
3162 {
3163         return;
3164 }
3165 #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
3166
3167 /* called with console_lock held */
3168 static int fbcon_fb_registered(struct fb_info *info)
3169 {
3170         int ret = 0, i, idx;
3171
3172         idx = info->node;
3173         fbcon_select_primary(info);
3174
3175         if (info_idx == -1) {
3176                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3177                         if (con2fb_map_boot[i] == idx) {
3178                                 info_idx = idx;
3179                                 break;
3180                         }
3181                 }
3182
3183                 if (info_idx != -1)
3184                         ret = do_fbcon_takeover(1);
3185         } else {
3186                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3187                         if (con2fb_map_boot[i] == idx)
3188                                 set_con2fb_map(i, idx, 0);
3189                 }
3190         }
3191
3192         return ret;
3193 }
3194
3195 static void fbcon_fb_blanked(struct fb_info *info, int blank)
3196 {
3197         struct fbcon_ops *ops = info->fbcon_par;
3198         struct vc_data *vc;
3199
3200         if (!ops || ops->currcon < 0)
3201                 return;
3202
3203         vc = vc_cons[ops->currcon].d;
3204         if (vc->vc_mode != KD_TEXT ||
3205                         registered_fb[con2fb_map[ops->currcon]] != info)
3206                 return;
3207
3208         if (con_is_visible(vc)) {
3209                 if (blank)
3210                         do_blank_screen(0);
3211                 else
3212                         do_unblank_screen(0);
3213         }
3214         ops->blank_state = blank;
3215 }
3216
3217 static void fbcon_new_modelist(struct fb_info *info)
3218 {
3219         int i;
3220         struct vc_data *vc;
3221         struct fb_var_screeninfo var;
3222         const struct fb_videomode *mode;
3223
3224         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3225                 if (registered_fb[con2fb_map[i]] != info)
3226                         continue;
3227                 if (!fb_display[i].mode)
3228                         continue;
3229                 vc = vc_cons[i].d;
3230                 display_to_var(&var, &fb_display[i]);
3231                 mode = fb_find_nearest_mode(fb_display[i].mode,
3232                                             &info->modelist);
3233                 fb_videomode_to_var(&var, mode);
3234                 fbcon_set_disp(info, &var, vc->vc_num);
3235         }
3236 }
3237
3238 static void fbcon_get_requirement(struct fb_info *info,
3239                                   struct fb_blit_caps *caps)
3240 {
3241         struct vc_data *vc;
3242         struct display *p;
3243
3244         if (caps->flags) {
3245                 int i, charcnt;
3246
3247                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3248                         vc = vc_cons[i].d;
3249                         if (vc && vc->vc_mode == KD_TEXT &&
3250                             info->node == con2fb_map[i]) {
3251                                 p = &fb_display[i];
3252                                 caps->x |= 1 << (vc->vc_font.width - 1);
3253                                 caps->y |= 1 << (vc->vc_font.height - 1);
3254                                 charcnt = (p->userfont) ?
3255                                         FNTCHARCNT(p->fontdata) : 256;
3256                                 if (caps->len < charcnt)
3257                                         caps->len = charcnt;
3258                         }
3259                 }
3260         } else {
3261                 vc = vc_cons[fg_console].d;
3262
3263                 if (vc && vc->vc_mode == KD_TEXT &&
3264                     info->node == con2fb_map[fg_console]) {
3265                         p = &fb_display[fg_console];
3266                         caps->x = 1 << (vc->vc_font.width - 1);
3267                         caps->y = 1 << (vc->vc_font.height - 1);
3268                         caps->len = (p->userfont) ?
3269                                 FNTCHARCNT(p->fontdata) : 256;
3270                 }
3271         }
3272 }
3273
3274 static int fbcon_event_notify(struct notifier_block *self,
3275                               unsigned long action, void *data)
3276 {
3277         struct fb_event *event = data;
3278         struct fb_info *info = event->info;
3279         struct fb_videomode *mode;
3280         struct fb_con2fbmap *con2fb;
3281         struct fb_blit_caps *caps;
3282         int idx, ret = 0;
3283
3284         /*
3285          * ignore all events except driver registration and deregistration
3286          * if fbcon is not active
3287          */
3288         if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
3289                                   action == FB_EVENT_FB_UNREGISTERED))
3290                 goto done;
3291
3292         switch(action) {
3293         case FB_EVENT_SUSPEND:
3294                 fbcon_suspended(info);
3295                 break;
3296         case FB_EVENT_RESUME:
3297                 fbcon_resumed(info);
3298                 break;
3299         case FB_EVENT_MODE_CHANGE:
3300                 fbcon_modechanged(info);
3301                 break;
3302         case FB_EVENT_MODE_CHANGE_ALL:
3303                 fbcon_set_all_vcs(info);
3304                 break;
3305         case FB_EVENT_MODE_DELETE:
3306                 mode = event->data;
3307                 ret = fbcon_mode_deleted(info, mode);
3308                 break;
3309         case FB_EVENT_FB_UNBIND:
3310                 idx = info->node;
3311                 ret = fbcon_fb_unbind(idx);
3312                 break;
3313         case FB_EVENT_FB_REGISTERED:
3314                 ret = fbcon_fb_registered(info);
3315                 break;
3316         case FB_EVENT_FB_UNREGISTERED:
3317                 ret = fbcon_fb_unregistered(info);
3318                 break;
3319         case FB_EVENT_SET_CONSOLE_MAP:
3320                 /* called with console lock held */
3321                 con2fb = event->data;
3322                 ret = set_con2fb_map(con2fb->console - 1,
3323                                      con2fb->framebuffer, 1);
3324                 break;
3325         case FB_EVENT_GET_CONSOLE_MAP:
3326                 con2fb = event->data;
3327                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
3328                 break;
3329         case FB_EVENT_BLANK:
3330                 fbcon_fb_blanked(info, *(int *)event->data);
3331                 break;
3332         case FB_EVENT_NEW_MODELIST:
3333                 fbcon_new_modelist(info);
3334                 break;
3335         case FB_EVENT_GET_REQ:
3336                 caps = event->data;
3337                 fbcon_get_requirement(info, caps);
3338                 break;
3339         case FB_EVENT_REMAP_ALL_CONSOLE:
3340                 idx = info->node;
3341                 fbcon_remap_all(idx);
3342                 break;
3343         }
3344 done:
3345         return ret;
3346 }
3347
3348 /*
3349  *  The console `switch' structure for the frame buffer based console
3350  */
3351
3352 static const struct consw fb_con = {
3353         .owner                  = THIS_MODULE,
3354         .con_startup            = fbcon_startup,
3355         .con_init               = fbcon_init,
3356         .con_deinit             = fbcon_deinit,
3357         .con_clear              = fbcon_clear,
3358         .con_putc               = fbcon_putc,
3359         .con_putcs              = fbcon_putcs,
3360         .con_cursor             = fbcon_cursor,
3361         .con_scroll             = fbcon_scroll,
3362         .con_switch             = fbcon_switch,
3363         .con_blank              = fbcon_blank,
3364         .con_font_set           = fbcon_set_font,
3365         .con_font_get           = fbcon_get_font,
3366         .con_font_default       = fbcon_set_def_font,
3367         .con_font_copy          = fbcon_copy_font,
3368         .con_set_palette        = fbcon_set_palette,
3369         .con_scrolldelta        = fbcon_scrolldelta,
3370         .con_set_origin         = fbcon_set_origin,
3371         .con_invert_region      = fbcon_invert_region,
3372         .con_screen_pos         = fbcon_screen_pos,
3373         .con_getxy              = fbcon_getxy,
3374         .con_resize             = fbcon_resize,
3375         .con_debug_enter        = fbcon_debug_enter,
3376         .con_debug_leave        = fbcon_debug_leave,
3377 };
3378
3379 static struct notifier_block fbcon_event_notifier = {
3380         .notifier_call  = fbcon_event_notify,
3381 };
3382
3383 static ssize_t store_rotate(struct device *device,
3384                             struct device_attribute *attr, const char *buf,
3385                             size_t count)
3386 {
3387         struct fb_info *info;
3388         int rotate, idx;
3389         char **last = NULL;
3390
3391         if (fbcon_has_exited)
3392                 return count;
3393
3394         console_lock();
3395         idx = con2fb_map[fg_console];
3396
3397         if (idx == -1 || registered_fb[idx] == NULL)
3398                 goto err;
3399
3400         info = registered_fb[idx];
3401         rotate = simple_strtoul(buf, last, 0);
3402         fbcon_rotate(info, rotate);
3403 err:
3404         console_unlock();
3405         return count;
3406 }
3407
3408 static ssize_t store_rotate_all(struct device *device,
3409                                 struct device_attribute *attr,const char *buf,
3410                                 size_t count)
3411 {
3412         struct fb_info *info;
3413         int rotate, idx;
3414         char **last = NULL;
3415
3416         if (fbcon_has_exited)
3417                 return count;
3418
3419         console_lock();
3420         idx = con2fb_map[fg_console];
3421
3422         if (idx == -1 || registered_fb[idx] == NULL)
3423                 goto err;
3424
3425         info = registered_fb[idx];
3426         rotate = simple_strtoul(buf, last, 0);
3427         fbcon_rotate_all(info, rotate);
3428 err:
3429         console_unlock();
3430         return count;
3431 }
3432
3433 static ssize_t show_rotate(struct device *device,
3434                            struct device_attribute *attr,char *buf)
3435 {
3436         struct fb_info *info;
3437         int rotate = 0, idx;
3438
3439         if (fbcon_has_exited)
3440                 return 0;
3441
3442         console_lock();
3443         idx = con2fb_map[fg_console];
3444
3445         if (idx == -1 || registered_fb[idx] == NULL)
3446                 goto err;
3447
3448         info = registered_fb[idx];
3449         rotate = fbcon_get_rotate(info);
3450 err:
3451         console_unlock();
3452         return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
3453 }
3454
3455 static ssize_t show_cursor_blink(struct device *device,
3456                                  struct device_attribute *attr, char *buf)
3457 {
3458         struct fb_info *info;
3459         struct fbcon_ops *ops;
3460         int idx, blink = -1;
3461
3462         if (fbcon_has_exited)
3463                 return 0;
3464
3465         console_lock();
3466         idx = con2fb_map[fg_console];
3467
3468         if (idx == -1 || registered_fb[idx] == NULL)
3469                 goto err;
3470
3471         info = registered_fb[idx];
3472         ops = info->fbcon_par;
3473
3474         if (!ops)
3475                 goto err;
3476
3477         blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0;
3478 err:
3479         console_unlock();
3480         return snprintf(buf, PAGE_SIZE, "%d\n", blink);
3481 }
3482
3483 static ssize_t store_cursor_blink(struct device *device,
3484                                   struct device_attribute *attr,
3485                                   const char *buf, size_t count)
3486 {
3487         struct fb_info *info;
3488         int blink, idx;
3489         char **last = NULL;
3490
3491         if (fbcon_has_exited)
3492                 return count;
3493
3494         console_lock();
3495         idx = con2fb_map[fg_console];
3496
3497         if (idx == -1 || registered_fb[idx] == NULL)
3498                 goto err;
3499
3500         info = registered_fb[idx];
3501
3502         if (!info->fbcon_par)
3503                 goto err;
3504
3505         blink = simple_strtoul(buf, last, 0);
3506
3507         if (blink) {
3508                 fbcon_cursor_noblink = 0;
3509                 fbcon_add_cursor_timer(info);
3510         } else {
3511                 fbcon_cursor_noblink = 1;
3512                 fbcon_del_cursor_timer(info);
3513         }
3514
3515 err:
3516         console_unlock();
3517         return count;
3518 }
3519
3520 static struct device_attribute device_attrs[] = {
3521         __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
3522         __ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
3523         __ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
3524                store_cursor_blink),
3525 };
3526
3527 static int fbcon_init_device(void)
3528 {
3529         int i, error = 0;
3530
3531         fbcon_has_sysfs = 1;
3532
3533         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3534                 error = device_create_file(fbcon_device, &device_attrs[i]);
3535
3536                 if (error)
3537                         break;
3538         }
3539
3540         if (error) {
3541                 while (--i >= 0)
3542                         device_remove_file(fbcon_device, &device_attrs[i]);
3543
3544                 fbcon_has_sysfs = 0;
3545         }
3546
3547         return 0;
3548 }
3549
3550 static void fbcon_start(void)
3551 {
3552         if (num_registered_fb) {
3553                 int i;
3554
3555                 console_lock();
3556
3557                 for (i = 0; i < FB_MAX; i++) {
3558                         if (registered_fb[i] != NULL) {
3559                                 info_idx = i;
3560                                 break;
3561                         }
3562                 }
3563
3564                 do_fbcon_takeover(0);
3565                 console_unlock();
3566
3567         }
3568 }
3569
3570 static void fbcon_exit(void)
3571 {
3572         struct fb_info *info;
3573         int i, j, mapped;
3574
3575         if (fbcon_has_exited)
3576                 return;
3577
3578         kfree((void *)softback_buf);
3579         softback_buf = 0UL;
3580
3581         for (i = 0; i < FB_MAX; i++) {
3582                 int pending = 0;
3583
3584                 mapped = 0;
3585                 info = registered_fb[i];
3586
3587                 if (info == NULL)
3588                         continue;
3589
3590                 if (info->queue.func)
3591                         pending = cancel_work_sync(&info->queue);
3592                 DPRINTK("fbcon: %s pending work\n", (pending ? "canceled" :
3593                         "no"));
3594
3595                 for (j = first_fb_vc; j <= last_fb_vc; j++) {
3596                         if (con2fb_map[j] == i) {
3597                                 mapped = 1;
3598                                 break;
3599                         }
3600                 }
3601
3602                 if (mapped) {
3603                         if (info->fbops->fb_release)
3604                                 info->fbops->fb_release(info, 0);
3605                         module_put(info->fbops->owner);
3606
3607                         if (info->fbcon_par) {
3608                                 struct fbcon_ops *ops = info->fbcon_par;
3609
3610                                 fbcon_del_cursor_timer(info);
3611                                 kfree(ops->cursor_src);
3612                                 kfree(ops->cursor_state.mask);
3613                                 kfree(info->fbcon_par);
3614                                 info->fbcon_par = NULL;
3615                         }
3616
3617                         if (info->queue.func == fb_flashcursor)
3618                                 info->queue.func = NULL;
3619                 }
3620         }
3621
3622         fbcon_has_exited = 1;
3623 }
3624
3625 void __init fb_console_init(void)
3626 {
3627         int i;
3628
3629         console_lock();
3630         fb_register_client(&fbcon_event_notifier);
3631         fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
3632                                      "fbcon");
3633
3634         if (IS_ERR(fbcon_device)) {
3635                 printk(KERN_WARNING "Unable to create device "
3636                        "for fbcon; errno = %ld\n",
3637                        PTR_ERR(fbcon_device));
3638                 fbcon_device = NULL;
3639         } else
3640                 fbcon_init_device();
3641
3642         for (i = 0; i < MAX_NR_CONSOLES; i++)
3643                 con2fb_map[i] = -1;
3644
3645         console_unlock();
3646         fbcon_start();
3647 }
3648
3649 #ifdef MODULE
3650
3651 static void __exit fbcon_deinit_device(void)
3652 {
3653         int i;
3654
3655         if (fbcon_has_sysfs) {
3656                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3657                         device_remove_file(fbcon_device, &device_attrs[i]);
3658
3659                 fbcon_has_sysfs = 0;
3660         }
3661 }
3662
3663 void __exit fb_console_exit(void)
3664 {
3665         console_lock();
3666         fb_unregister_client(&fbcon_event_notifier);
3667         fbcon_deinit_device();
3668         device_destroy(fb_class, MKDEV(0, 0));
3669         fbcon_exit();
3670         do_unregister_con_driver(&fb_con);
3671         console_unlock();
3672 }
3673 #endif