drivers/video/console/fbcon.c

   1 /*
   2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1995 Geert Uytterhoeven
   5  *
   6  *
   7  *  This file is based on the original Amiga console driver (amicon.c):
   8  *
   9  *      Copyright (C) 1993 Hamish Macdonald
  10  *                         Greg Harp
  11  *      Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
  12  *
  13  *            with work by William Rucklidge (wjr@cs.cornell.edu)
  14  *                         Geert Uytterhoeven
  15  *                         Jes Sorensen (jds@kom.auc.dk)
  16  *                         Martin Apel
  17  *
  18  *  and on the original Atari console driver (atacon.c):
  19  *
  20  *      Copyright (C) 1993 Bjoern Brauel
  21  *                         Roman Hodek
  22  *
  23  *            with work by Guenther Kelleter
  24  *                         Martin Schaller
  25  *                         Andreas Schwab
  26  *
  27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
  28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
  29  *  and software scrollback added by
  30  *                         Jakub Jelinek (jj@ultra.linux.cz)
  31  *
  32  *  Random hacking by Martin Mares <mj@ucw.cz>
  33  *
  34  *      2001 - Documented with DocBook
  35  *      - Brad Douglas <brad@neruo.com>
  36  *
  37  *  The low level operations for the various display memory organizations are
  38  *  now in separate source files.
  39  *
  40  *  Currently the following organizations are supported:
  41  *
  42  *    o afb                     Amiga bitplanes
  43  *    o cfb{2,4,8,16,24,32}     Packed pixels
  44  *    o ilbm                    Amiga interleaved bitplanes
  45  *    o iplan2p[248]            Atari interleaved bitplanes
  46  *    o mfb                     Monochrome
  47  *    o vga                     VGA characters/attributes
  48  *
  49  *  To do:
  50  *
  51  *    - Implement 16 plane mode (iplan2p16)
  52  *
  53  *
  54  *  This file is subject to the terms and conditions of the GNU General Public
  55  *  License.  See the file COPYING in the main directory of this archive for
  56  *  more details.
  57  */
  58
  59 #undef FBCONDEBUG
  60
  61 #include <linux/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/vt_kern.h>
  72 #include <linux/selection.h>
  73 #include <linux/font.h>
  74 #include <linux/smp.h>
  75 #include <linux/init.h>
  76 #include <linux/interrupt.h>
  77 #include <linux/crc32.h> /* For counting font checksums */
  78 #include <asm/fb.h>
  79 #include <asm/irq.h>
  80
  81 #include "fbcon.h"
  82
  83 #ifdef FBCONDEBUG
  84 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __func__ , ## args)
  85 #else
  86 #  define DPRINTK(fmt, args...)
  87 #endif
  88
  89 enum {
  90         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
  91         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
  92         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
  93 };
  94
  95 static struct display fb_display[MAX_NR_CONSOLES];
  96
  97 static signed char con2fb_map[MAX_NR_CONSOLES];
  98 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
  99
 100 static int logo_lines;
 101 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 102    enums.  */
 103 static int logo_shown = FBCON_LOGO_CANSHOW;
 104 /* Software scrollback */
 105 static int fbcon_softback_size = 32768;
 106 static unsigned long softback_buf, softback_curr;
 107 static unsigned long softback_in;
 108 static unsigned long softback_top, softback_end;
 109 static int softback_lines;
 110 /* console mappings */
 111 static int first_fb_vc;
 112 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 113 static int fbcon_is_default = 1;
 114 static int fbcon_has_exited;
 115 static int primary_device = -1;
 116 static int fbcon_has_console_bind;
 117
 118 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
 119 static int map_override;
 120
 121 static inline void fbcon_map_override(void)
 122 {
 123         map_override = 1;
 124 }
 125 #else
 126 static inline void fbcon_map_override(void)
 127 {
 128 }
 129 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */
 130
 131 /* font data */
 132 static char fontname[40];
 133
 134 /* current fb_info */
 135 static int info_idx = -1;
 136
 137 /* console rotation */
 138 static int initial_rotation;
 139 static int fbcon_has_sysfs;
 140
 141 static const struct consw fb_con;
 142
 143 #define CM_SOFTBACK     (8)
 144
 145 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 146
 147 static int fbcon_set_origin(struct vc_data *);
 148
 149 static int fbcon_cursor_noblink;
 150
 151 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 152
 153 /*
 154  *  Interface used by the world
 155  */
 156
 157 static const char *fbcon_startup(void);
 158 static void fbcon_init(struct vc_data *vc, int init);
 159 static void fbcon_deinit(struct vc_data *vc);
 160 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 161                         int width);
 162 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
 163 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 164                         int count, int ypos, int xpos);
 165 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 166 static void fbcon_cursor(struct vc_data *vc, int mode);
 167 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
 168                         int height, int width);
 169 static int fbcon_switch(struct vc_data *vc);
 170 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
 171 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table);
 172
 173 /*
 174  *  Internal routines
 175  */
 176 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 177 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 178 static __inline__ void ypan_up(struct vc_data *vc, int count);
 179 static __inline__ void ypan_down(struct vc_data *vc, int count);
 180 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
 181                             int dy, int dx, int height, int width, u_int y_break);
 182 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 183                            int unit);
 184 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 185                               int line, int count, int dy);
 186 static void fbcon_modechanged(struct fb_info *info);
 187 static void fbcon_set_all_vcs(struct fb_info *info);
 188 static void fbcon_start(void);
 189 static void fbcon_exit(void);
 190 static struct device *fbcon_device;
 191
 192 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 193 static inline void fbcon_set_rotation(struct fb_info *info)
 194 {
 195         struct fbcon_ops *ops = info->fbcon_par;
 196
 197         if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
 198             ops->p->con_rotate < 4)
 199                 ops->rotate = ops->p->con_rotate;
 200         else
 201                 ops->rotate = 0;
 202 }
 203
 204 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 205 {
 206         struct fbcon_ops *ops= info->fbcon_par;
 207         struct fb_info *fb_info;
 208
 209         if (!ops || ops->currcon == -1)
 210                 return;
 211
 212         fb_info = registered_fb[con2fb_map[ops->currcon]];
 213
 214         if (info == fb_info) {
 215                 struct display *p = &fb_display[ops->currcon];
 216
 217                 if (rotate < 4)
 218                         p->con_rotate = rotate;
 219                 else
 220                         p->con_rotate = 0;
 221
 222                 fbcon_modechanged(info);
 223         }
 224 }
 225
 226 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 227 {
 228         struct fbcon_ops *ops = info->fbcon_par;
 229         struct vc_data *vc;
 230         struct display *p;
 231         int i;
 232
 233         if (!ops || ops->currcon < 0 || rotate > 3)
 234                 return;
 235
 236         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 237                 vc = vc_cons[i].d;
 238                 if (!vc || vc->vc_mode != KD_TEXT ||
 239                     registered_fb[con2fb_map[i]] != info)
 240                         continue;
 241
 242                 p = &fb_display[vc->vc_num];
 243                 p->con_rotate = rotate;
 244         }
 245
 246         fbcon_set_all_vcs(info);
 247 }
 248 #else
 249 static inline void fbcon_set_rotation(struct fb_info *info)
 250 {
 251         struct fbcon_ops *ops = info->fbcon_par;
 252
 253         ops->rotate = FB_ROTATE_UR;
 254 }
 255
 256 static void fbcon_rotate(struct fb_info *info, u32 rotate)
 257 {
 258         return;
 259 }
 260
 261 static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
 262 {
 263         return;
 264 }
 265 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 266
 267 static int fbcon_get_rotate(struct fb_info *info)
 268 {
 269         struct fbcon_ops *ops = info->fbcon_par;
 270
 271         return (ops) ? ops->rotate : 0;
 272 }
 273
 274 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 275 {
 276         struct fbcon_ops *ops = info->fbcon_par;
 277
 278         return (info->state != FBINFO_STATE_RUNNING ||
 279                 vc->vc_mode != KD_TEXT || ops->graphics) &&
 280                 !vt_force_oops_output(vc);
 281 }
 282
 283 static int get_color(struct vc_data *vc, struct fb_info *info,
 284               u16 c, int is_fg)
 285 {
 286         int depth = fb_get_color_depth(&info->var, &info->fix);
 287         int color = 0;
 288
 289         if (console_blanked) {
 290                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 291
 292                 c = vc->vc_video_erase_char & charmask;
 293         }
 294
 295         if (depth != 1)
 296                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 297                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 298
 299         switch (depth) {
 300         case 1:
 301         {
 302                 int col = mono_col(info);
 303                 /* 0 or 1 */
 304                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
 305                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
 306
 307                 if (console_blanked)
 308                         fg = bg;
 309
 310                 color = (is_fg) ? fg : bg;
 311                 break;
 312         }
 313         case 2:
 314                 /*
 315                  * Scale down 16-colors to 4 colors. Default 4-color palette
 316                  * is grayscale. However, simply dividing the values by 4
 317                  * will not work, as colors 1, 2 and 3 will be scaled-down
 318                  * to zero rendering them invisible.  So empirically convert
 319                  * colors to a sane 4-level grayscale.
 320                  */
 321                 switch (color) {
 322                 case 0:
 323                         color = 0; /* black */
 324                         break;
 325                 case 1 ... 6:
 326                         color = 2; /* white */
 327                         break;
 328                 case 7 ... 8:
 329                         color = 1; /* gray */
 330                         break;
 331                 default:
 332                         color = 3; /* intense white */
 333                         break;
 334                 }
 335                 break;
 336         case 3:
 337                 /*
 338                  * Last 8 entries of default 16-color palette is a more intense
 339                  * version of the first 8 (i.e., same chrominance, different
 340                  * luminance).
 341                  */
 342                 color &= 7;
 343                 break;
 344         }
 345
 346
 347         return color;
 348 }
 349
 350 static void fbcon_update_softback(struct vc_data *vc)
 351 {
 352         int l = fbcon_softback_size / vc->vc_size_row;
 353
 354         if (l > 5)
 355                 softback_end = softback_buf + l * vc->vc_size_row;
 356         else
 357                 /* Smaller scrollback makes no sense, and 0 would screw
 358                    the operation totally */
 359                 softback_top = 0;
 360 }
 361
 362 static void fb_flashcursor(struct work_struct *work)
 363 {
 364         struct fb_info *info = container_of(work, struct fb_info, queue);
 365         struct fbcon_ops *ops = info->fbcon_par;
 366         struct vc_data *vc = NULL;
 367         int c;
 368         int mode;
 369         int ret;
 370
 371         /* FIXME: we should sort out the unbind locking instead */
 372         /* instead we just fail to flash the cursor if we can't get
 373          * the lock instead of blocking fbcon deinit */
 374         ret = console_trylock();
 375         if (ret == 0)
 376                 return;
 377
 378         if (ops && ops->currcon != -1)
 379                 vc = vc_cons[ops->currcon].d;
 380
 381         if (!vc || !con_is_visible(vc) ||
 382             registered_fb[con2fb_map[vc->vc_num]] != info ||
 383             vc->vc_deccm != 1) {
 384                 console_unlock();
 385                 return;
 386         }
 387
 388         c = scr_readw((u16 *) vc->vc_pos);
 389         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 390                 CM_ERASE : CM_DRAW;
 391         ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
 392                     get_color(vc, info, c, 0));
 393         console_unlock();
 394 }
 395
 396 static void cursor_timer_handler(unsigned long dev_addr)
 397 {
 398         struct fb_info *info = (struct fb_info *) dev_addr;
 399         struct fbcon_ops *ops = info->fbcon_par;
 400
 401         queue_work(system_power_efficient_wq, &info->queue);
 402         mod_timer(&ops->cursor_timer, jiffies + ops->cur_blink_jiffies);
 403 }
 404
 405 static void fbcon_add_cursor_timer(struct fb_info *info)
 406 {
 407         struct fbcon_ops *ops = info->fbcon_par;
 408
 409         if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
 410             !(ops->flags & FBCON_FLAGS_CURSOR_TIMER) &&
 411             !fbcon_cursor_noblink) {
 412                 if (!info->queue.func)
 413                         INIT_WORK(&info->queue, fb_flashcursor);
 414
 415                 init_timer(&ops->cursor_timer);
 416                 ops->cursor_timer.function = cursor_timer_handler;
 417                 ops->cursor_timer.expires = jiffies + ops->cur_blink_jiffies;
 418                 ops->cursor_timer.data = (unsigned long ) info;
 419                 add_timer(&ops->cursor_timer);
 420                 ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
 421         }
 422 }
 423
 424 static void fbcon_del_cursor_timer(struct fb_info *info)
 425 {
 426         struct fbcon_ops *ops = info->fbcon_par;
 427
 428         if (info->queue.func == fb_flashcursor &&
 429             ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
 430                 del_timer_sync(&ops->cursor_timer);
 431                 ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
 432         }
 433 }
 434
 435 #ifndef MODULE
 436 static int __init fb_console_setup(char *this_opt)
 437 {
 438         char *options;
 439         int i, j;
 440
 441         if (!this_opt || !*this_opt)
 442                 return 1;
 443
 444         while ((options = strsep(&this_opt, ",")) != NULL) {
 445                 if (!strncmp(options, "font:", 5)) {
 446                         strlcpy(fontname, options + 5, sizeof(fontname));
 447                         continue;
 448                 }
 449
 450                 if (!strncmp(options, "scrollback:", 11)) {
 451                         options += 11;
 452                         if (*options) {
 453                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
 454                                 if (*options == 'k' || *options == 'K') {
 455                                         fbcon_softback_size *= 1024;
 456                                 }
 457                         }
 458                         continue;
 459                 }
 460
 461                 if (!strncmp(options, "map:", 4)) {
 462                         options += 4;
 463                         if (*options) {
 464                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 465                                         if (!options[j])
 466                                                 j = 0;
 467                                         con2fb_map_boot[i] =
 468                                                 (options[j++]-'0') % FB_MAX;
 469                                 }
 470
 471                                 fbcon_map_override();
 472                         }
 473                         continue;
 474                 }
 475
 476                 if (!strncmp(options, "vc:", 3)) {
 477                         options += 3;
 478                         if (*options)
 479                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 480                         if (first_fb_vc < 0)
 481                                 first_fb_vc = 0;
 482                         if (*options++ == '-')
 483                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 484                         fbcon_is_default = 0;
 485                         continue;
 486                 }
 487
 488                 if (!strncmp(options, "rotate:", 7)) {
 489                         options += 7;
 490                         if (*options)
 491                                 initial_rotation = simple_strtoul(options, &options, 0);
 492                         if (initial_rotation > 3)
 493                                 initial_rotation = 0;
 494                         continue;
 495                 }
 496         }
 497         return 1;
 498 }
 499
 500 __setup("fbcon=", fb_console_setup);
 501 #endif
 502
 503 static int search_fb_in_map(int idx)
 504 {
 505         int i, retval = 0;
 506
 507         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 508                 if (con2fb_map[i] == idx)
 509                         retval = 1;
 510         }
 511         return retval;
 512 }
 513
 514 static int search_for_mapped_con(void)
 515 {
 516         int i, retval = 0;
 517
 518         for (i = first_fb_vc; i <= last_fb_vc; i++) {
 519                 if (con2fb_map[i] != -1)
 520                         retval = 1;
 521         }
 522         return retval;
 523 }
 524
 525 static int do_fbcon_takeover(int show_logo)
 526 {
 527         int err, i;
 528
 529         if (!num_registered_fb)
 530                 return -ENODEV;
 531
 532         if (!show_logo)
 533                 logo_shown = FBCON_LOGO_DONTSHOW;
 534
 535         for (i = first_fb_vc; i <= last_fb_vc; i++)
 536                 con2fb_map[i] = info_idx;
 537
 538         err = do_take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 539                                 fbcon_is_default);
 540
 541         if (err) {
 542                 for (i = first_fb_vc; i <= last_fb_vc; i++)
 543                         con2fb_map[i] = -1;
 544                 info_idx = -1;
 545         } else {
 546                 fbcon_has_console_bind = 1;
 547         }
 548
 549         return err;
 550 }
 551
 552 #ifdef MODULE
 553 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 554                                int cols, int rows, int new_cols, int new_rows)
 555 {
 556         logo_shown = FBCON_LOGO_DONTSHOW;
 557 }
 558 #else
 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         /* Need to make room for the logo */
 563         struct fbcon_ops *ops = info->fbcon_par;
 564         int cnt, erase = vc->vc_video_erase_char, step;
 565         unsigned short *save = NULL, *r, *q;
 566         int logo_height;
 567
 568         if (info->flags & FBINFO_MODULE) {
 569                 logo_shown = FBCON_LOGO_DONTSHOW;
 570                 return;
 571         }
 572
 573         /*
 574          * remove underline attribute from erase character
 575          * if black and white framebuffer.
 576          */
 577         if (fb_get_color_depth(&info->var, &info->fix) == 1)
 578                 erase &= ~0x400;
 579         logo_height = fb_prepare_logo(info, ops->rotate);
 580         logo_lines = DIV_ROUND_UP(logo_height, vc->vc_font.height);
 581         q = (unsigned short *) (vc->vc_origin +
 582                                 vc->vc_size_row * rows);
 583         step = logo_lines * cols;
 584         for (r = q - logo_lines * cols; r < q; r++)
 585                 if (scr_readw(r) != vc->vc_video_erase_char)
 586                         break;
 587         if (r != q && new_rows >= rows + logo_lines) {
 588                 save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
 589                 if (save) {
 590                         int i = cols < new_cols ? cols : new_cols;
 591                         scr_memsetw(save, erase, logo_lines * new_cols * 2);
 592                         r = q - step;
 593                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 594                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 595                         r = q;
 596                 }
 597         }
 598         if (r == q) {
 599                 /* We can scroll screen down */
 600                 r = q - step - cols;
 601                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 602                         scr_memcpyw(r + step, r, vc->vc_size_row);
 603                         r -= cols;
 604                 }
 605                 if (!save) {
 606                         int lines;
 607                         if (vc->vc_y + logo_lines >= rows)
 608                                 lines = rows - vc->vc_y - 1;
 609                         else
 610                                 lines = logo_lines;
 611                         vc->vc_y += lines;
 612                         vc->vc_pos += lines * vc->vc_size_row;
 613                 }
 614         }
 615         scr_memsetw((unsigned short *) vc->vc_origin,
 616                     erase,
 617                     vc->vc_size_row * logo_lines);
 618
 619         if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
 620                 fbcon_clear_margins(vc, 0);
 621                 update_screen(vc);
 622         }
 623
 624         if (save) {
 625                 q = (unsigned short *) (vc->vc_origin +
 626                                         vc->vc_size_row *
 627                                         rows);
 628                 scr_memcpyw(q, save, logo_lines * new_cols * 2);
 629                 vc->vc_y += logo_lines;
 630                 vc->vc_pos += logo_lines * vc->vc_size_row;
 631                 kfree(save);
 632         }
 633
 634         if (logo_lines > vc->vc_bottom) {
 635                 logo_shown = FBCON_LOGO_CANSHOW;
 636                 printk(KERN_INFO
 637                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
 638         } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
 639                 logo_shown = FBCON_LOGO_DRAW;
 640                 vc->vc_top = logo_lines;
 641         }
 642 }
 643 #endif /* MODULE */
 644
 645 #ifdef CONFIG_FB_TILEBLITTING
 646 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 647 {
 648         struct fbcon_ops *ops = info->fbcon_par;
 649
 650         ops->p = &fb_display[vc->vc_num];
 651
 652         if ((info->flags & FBINFO_MISC_TILEBLITTING))
 653                 fbcon_set_tileops(vc, info);
 654         else {
 655                 fbcon_set_rotation(info);
 656                 fbcon_set_bitops(ops);
 657         }
 658 }
 659
 660 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 661 {
 662         int err = 0;
 663
 664         if (info->flags & FBINFO_MISC_TILEBLITTING &&
 665             info->tileops->fb_get_tilemax(info) < charcount)
 666                 err = 1;
 667
 668         return err;
 669 }
 670 #else
 671 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 672 {
 673         struct fbcon_ops *ops = info->fbcon_par;
 674
 675         info->flags &= ~FBINFO_MISC_TILEBLITTING;
 676         ops->p = &fb_display[vc->vc_num];
 677         fbcon_set_rotation(info);
 678         fbcon_set_bitops(ops);
 679 }
 680
 681 static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
 682 {
 683         return 0;
 684 }
 685
 686 #endif /* CONFIG_MISC_TILEBLITTING */
 687
 688
 689 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
 690                                   int unit, int oldidx)
 691 {
 692         struct fbcon_ops *ops = NULL;
 693         int err = 0;
 694
 695         if (!try_module_get(info->fbops->owner))
 696                 err = -ENODEV;
 697
 698         if (!err && info->fbops->fb_open &&
 699             info->fbops->fb_open(info, 0))
 700                 err = -ENODEV;
 701
 702         if (!err) {
 703                 ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 704                 if (!ops)
 705                         err = -ENOMEM;
 706         }
 707
 708         if (!err) {
 709                 ops->cur_blink_jiffies = HZ / 5;
 710                 info->fbcon_par = ops;
 711
 712                 if (vc)
 713                         set_blitting_type(vc, info);
 714         }
 715
 716         if (err) {
 717                 con2fb_map[unit] = oldidx;
 718                 module_put(info->fbops->owner);
 719         }
 720
 721         return err;
 722 }
 723
 724 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 725                                   struct fb_info *newinfo, int unit,
 726                                   int oldidx, int found)
 727 {
 728         struct fbcon_ops *ops = oldinfo->fbcon_par;
 729         int err = 0, ret;
 730
 731         if (oldinfo->fbops->fb_release &&
 732             oldinfo->fbops->fb_release(oldinfo, 0)) {
 733                 con2fb_map[unit] = oldidx;
 734                 if (!found && newinfo->fbops->fb_release)
 735                         newinfo->fbops->fb_release(newinfo, 0);
 736                 if (!found)
 737                         module_put(newinfo->fbops->owner);
 738                 err = -ENODEV;
 739         }
 740
 741         if (!err) {
 742                 fbcon_del_cursor_timer(oldinfo);
 743                 kfree(ops->cursor_state.mask);
 744                 kfree(ops->cursor_data);
 745                 kfree(ops->cursor_src);
 746                 kfree(ops->fontbuffer);
 747                 kfree(oldinfo->fbcon_par);
 748                 oldinfo->fbcon_par = NULL;
 749                 module_put(oldinfo->fbops->owner);
 750                 /*
 751                   If oldinfo and newinfo are driving the same hardware,
 752                   the fb_release() method of oldinfo may attempt to
 753                   restore the hardware state.  This will leave the
 754                   newinfo in an undefined state. Thus, a call to
 755                   fb_set_par() may be needed for the newinfo.
 756                 */
 757                 if (newinfo && newinfo->fbops->fb_set_par) {
 758                         ret = newinfo->fbops->fb_set_par(newinfo);
 759
 760                         if (ret)
 761                                 printk(KERN_ERR "con2fb_release_oldinfo: "
 762                                         "detected unhandled fb_set_par error, "
 763                                         "error code %d\n", ret);
 764                 }
 765         }
 766
 767         return err;
 768 }
 769
 770 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 771                                 int unit, int show_logo)
 772 {
 773         struct fbcon_ops *ops = info->fbcon_par;
 774         int ret;
 775
 776         ops->currcon = fg_console;
 777
 778         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT)) {
 779                 ret = info->fbops->fb_set_par(info);
 780
 781                 if (ret)
 782                         printk(KERN_ERR "con2fb_init_display: detected "
 783                                 "unhandled fb_set_par error, "
 784                                 "error code %d\n", ret);
 785         }
 786
 787         ops->flags |= FBCON_FLAGS_INIT;
 788         ops->graphics = 0;
 789         fbcon_set_disp(info, &info->var, unit);
 790
 791         if (show_logo) {
 792                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 793                 struct fb_info *fg_info =
 794                         registered_fb[con2fb_map[fg_console]];
 795
 796                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 797                                    fg_vc->vc_rows, fg_vc->vc_cols,
 798                                    fg_vc->vc_rows);
 799         }
 800
 801         update_screen(vc_cons[fg_console].d);
 802 }
 803
 804 /**
 805  *      set_con2fb_map - map console to frame buffer device
 806  *      @unit: virtual console number to map
 807  *      @newidx: frame buffer index to map virtual console to
 808  *      @user: user request
 809  *
 810  *      Maps a virtual console @unit to a frame buffer device
 811  *      @newidx.
 812  *
 813  *      This should be called with the console lock held.
 814  */
 815 static int set_con2fb_map(int unit, int newidx, int user)
 816 {
 817         struct vc_data *vc = vc_cons[unit].d;
 818         int oldidx = con2fb_map[unit];
 819         struct fb_info *info = registered_fb[newidx];
 820         struct fb_info *oldinfo = NULL;
 821         int found, err = 0;
 822
 823         if (oldidx == newidx)
 824                 return 0;
 825
 826         if (!info)
 827                 return -EINVAL;
 828
 829         if (!search_for_mapped_con() || !con_is_bound(&fb_con)) {
 830                 info_idx = newidx;
 831                 return do_fbcon_takeover(0);
 832         }
 833
 834         if (oldidx != -1)
 835                 oldinfo = registered_fb[oldidx];
 836
 837         found = search_fb_in_map(newidx);
 838
 839         con2fb_map[unit] = newidx;
 840         if (!err && !found)
 841                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 842
 843
 844         /*
 845          * If old fb is not mapped to any of the consoles,
 846          * fbcon should release it.
 847          */
 848         if (!err && oldinfo && !search_fb_in_map(oldidx))
 849                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 850                                              found);
 851
 852         if (!err) {
 853                 int show_logo = (fg_console == 0 && !user &&
 854                                  logo_shown != FBCON_LOGO_DONTSHOW);
 855
 856                 if (!found)
 857                         fbcon_add_cursor_timer(info);
 858                 con2fb_map_boot[unit] = newidx;
 859                 con2fb_init_display(vc, info, unit, show_logo);
 860         }
 861
 862         if (!search_fb_in_map(info_idx))
 863                 info_idx = newidx;
 864
 865         return err;
 866 }
 867
 868 /*
 869  *  Low Level Operations
 870  */
 871 /* NOTE: fbcon cannot be __init: it may be called from do_take_over_console later */
 872 static int var_to_display(struct display *disp,
 873                           struct fb_var_screeninfo *var,
 874                           struct fb_info *info)
 875 {
 876         disp->xres_virtual = var->xres_virtual;
 877         disp->yres_virtual = var->yres_virtual;
 878         disp->bits_per_pixel = var->bits_per_pixel;
 879         disp->grayscale = var->grayscale;
 880         disp->nonstd = var->nonstd;
 881         disp->accel_flags = var->accel_flags;
 882         disp->height = var->height;
 883         disp->width = var->width;
 884         disp->red = var->red;
 885         disp->green = var->green;
 886         disp->blue = var->blue;
 887         disp->transp = var->transp;
 888         disp->rotate = var->rotate;
 889         disp->mode = fb_match_mode(var, &info->modelist);
 890         if (disp->mode == NULL)
 891                 /* This should not happen */
 892                 return -EINVAL;
 893         return 0;
 894 }
 895
 896 static void display_to_var(struct fb_var_screeninfo *var,
 897                            struct display *disp)
 898 {
 899         fb_videomode_to_var(var, disp->mode);
 900         var->xres_virtual = disp->xres_virtual;
 901         var->yres_virtual = disp->yres_virtual;
 902         var->bits_per_pixel = disp->bits_per_pixel;
 903         var->grayscale = disp->grayscale;
 904         var->nonstd = disp->nonstd;
 905         var->accel_flags = disp->accel_flags;
 906         var->height = disp->height;
 907         var->width = disp->width;
 908         var->red = disp->red;
 909         var->green = disp->green;
 910         var->blue = disp->blue;
 911         var->transp = disp->transp;
 912         var->rotate = disp->rotate;
 913 }
 914
 915 static const char *fbcon_startup(void)
 916 {
 917         const char *display_desc = "frame buffer device";
 918         struct display *p = &fb_display[fg_console];
 919         struct vc_data *vc = vc_cons[fg_console].d;
 920         const struct font_desc *font = NULL;
 921         struct module *owner;
 922         struct fb_info *info = NULL;
 923         struct fbcon_ops *ops;
 924         int rows, cols;
 925
 926         /*
 927          *  If num_registered_fb is zero, this is a call for the dummy part.
 928          *  The frame buffer devices weren't initialized yet.
 929          */
 930         if (!num_registered_fb || info_idx == -1)
 931                 return display_desc;
 932         /*
 933          * Instead of blindly using registered_fb[0], we use info_idx, set by
 934          * fb_console_init();
 935          */
 936         info = registered_fb[info_idx];
 937         if (!info)
 938                 return NULL;
 939
 940         owner = info->fbops->owner;
 941         if (!try_module_get(owner))
 942                 return NULL;
 943         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 944                 module_put(owner);
 945                 return NULL;
 946         }
 947
 948         ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 949         if (!ops) {
 950                 module_put(owner);
 951                 return NULL;
 952         }
 953
 954         ops->currcon = -1;
 955         ops->graphics = 1;
 956         ops->cur_rotate = -1;
 957         ops->cur_blink_jiffies = HZ / 5;
 958         info->fbcon_par = ops;
 959         p->con_rotate = initial_rotation;
 960         set_blitting_type(vc, info);
 961
 962         if (info->fix.type != FB_TYPE_TEXT) {
 963                 if (fbcon_softback_size) {
 964                         if (!softback_buf) {
 965                                 softback_buf =
 966                                     (unsigned long)
 967                                     kmalloc(fbcon_softback_size,
 968                                             GFP_KERNEL);
 969                                 if (!softback_buf) {
 970                                         fbcon_softback_size = 0;
 971                                         softback_top = 0;
 972                                 }
 973                         }
 974                 } else {
 975                         if (softback_buf) {
 976                                 kfree((void *) softback_buf);
 977                                 softback_buf = 0;
 978                                 softback_top = 0;
 979                         }
 980                 }
 981                 if (softback_buf)
 982                         softback_in = softback_top = softback_curr =
 983                             softback_buf;
 984                 softback_lines = 0;
 985         }
 986
 987         /* Setup default font */
 988         if (!p->fontdata && !vc->vc_font.data) {
 989                 if (!fontname[0] || !(font = find_font(fontname)))
 990                         font = get_default_font(info->var.xres,
 991                                                 info->var.yres,
 992                                                 info->pixmap.blit_x,
 993                                                 info->pixmap.blit_y);
 994                 vc->vc_font.width = font->width;
 995                 vc->vc_font.height = font->height;
 996                 vc->vc_font.data = (void *)(p->fontdata = font->data);
 997                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
 998         } else {
 999                 p->fontdata = vc->vc_font.data;
1000         }
1001
1002         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1003         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1004         cols /= vc->vc_font.width;
1005         rows /= vc->vc_font.height;
1006         vc_resize(vc, cols, rows);
1007
1008         DPRINTK("mode:   %s\n", info->fix.id);
1009         DPRINTK("visual: %d\n", info->fix.visual);
1010         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
1011                 info->var.yres,
1012                 info->var.bits_per_pixel);
1013
1014         fbcon_add_cursor_timer(info);
1015         fbcon_has_exited = 0;
1016         return display_desc;
1017 }
1018
1019 static void fbcon_init(struct vc_data *vc, int init)
1020 {
1021         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1022         struct fbcon_ops *ops;
1023         struct vc_data **default_mode = vc->vc_display_fg;
1024         struct vc_data *svc = *default_mode;
1025         struct display *t, *p = &fb_display[vc->vc_num];
1026         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
1027         int cap, ret;
1028
1029         if (info_idx == -1 || info == NULL)
1030             return;
1031
1032         cap = info->flags;
1033
1034         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
1035             (info->fix.type == FB_TYPE_TEXT))
1036                 logo = 0;
1037
1038         if (var_to_display(p, &info->var, info))
1039                 return;
1040
1041         if (!info->fbcon_par)
1042                 con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);
1043
1044         /* If we are not the first console on this
1045            fb, copy the font from that console */
1046         t = &fb_display[fg_console];
1047         if (!p->fontdata) {
1048                 if (t->fontdata) {
1049                         struct vc_data *fvc = vc_cons[fg_console].d;
1050
1051                         vc->vc_font.data = (void *)(p->fontdata =
1052                                                     fvc->vc_font.data);
1053                         vc->vc_font.width = fvc->vc_font.width;
1054                         vc->vc_font.height = fvc->vc_font.height;
1055                         p->userfont = t->userfont;
1056
1057                         if (p->userfont)
1058                                 REFCOUNT(p->fontdata)++;
1059                 } else {
1060                         const struct font_desc *font = NULL;
1061
1062                         if (!fontname[0] || !(font = find_font(fontname)))
1063                                 font = get_default_font(info->var.xres,
1064                                                         info->var.yres,
1065                                                         info->pixmap.blit_x,
1066                                                         info->pixmap.blit_y);
1067                         vc->vc_font.width = font->width;
1068                         vc->vc_font.height = font->height;
1069                         vc->vc_font.data = (void *)(p->fontdata = font->data);
1070                         vc->vc_font.charcount = 256; /* FIXME  Need to
1071                                                         support more fonts */
1072                 }
1073         }
1074
1075         if (p->userfont)
1076                 charcnt = FNTCHARCNT(p->fontdata);
1077
1078         vc->vc_panic_force_write = !!(info->flags & FBINFO_CAN_FORCE_OUTPUT);
1079         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1080         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1081         if (charcnt == 256) {
1082                 vc->vc_hi_font_mask = 0;
1083         } else {
1084                 vc->vc_hi_font_mask = 0x100;
1085                 if (vc->vc_can_do_color)
1086                         vc->vc_complement_mask <<= 1;
1087         }
1088
1089         if (!*svc->vc_uni_pagedir_loc)
1090                 con_set_default_unimap(svc);
1091         if (!*vc->vc_uni_pagedir_loc)
1092                 con_copy_unimap(vc, svc);
1093
1094         ops = info->fbcon_par;
1095         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1096         p->con_rotate = initial_rotation;
1097         set_blitting_type(vc, info);
1098
1099         cols = vc->vc_cols;
1100         rows = vc->vc_rows;
1101         new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1102         new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1103         new_cols /= vc->vc_font.width;
1104         new_rows /= vc->vc_font.height;
1105
1106         /*
1107          * We must always set the mode. The mode of the previous console
1108          * driver could be in the same resolution but we are using different
1109          * hardware so we have to initialize the hardware.
1110          *
1111          * We need to do it in fbcon_init() to prevent screen corruption.
1112          */
1113         if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
1114                 if (info->fbops->fb_set_par &&
1115                     !(ops->flags & FBCON_FLAGS_INIT)) {
1116                         ret = info->fbops->fb_set_par(info);
1117
1118                         if (ret)
1119                                 printk(KERN_ERR "fbcon_init: detected "
1120                                         "unhandled fb_set_par error, "
1121                                         "error code %d\n", ret);
1122                 }
1123
1124                 ops->flags |= FBCON_FLAGS_INIT;
1125         }
1126
1127         ops->graphics = 0;
1128
1129         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
1130             !(cap & FBINFO_HWACCEL_DISABLED))
1131                 p->scrollmode = SCROLL_MOVE;
1132         else /* default to something safe */
1133                 p->scrollmode = SCROLL_REDRAW;
1134
1135         /*
1136          *  ++guenther: console.c:vc_allocate() relies on initializing
1137          *  vc_{cols,rows}, but we must not set those if we are only
1138          *  resizing the console.
1139          */
1140         if (init) {
1141                 vc->vc_cols = new_cols;
1142                 vc->vc_rows = new_rows;
1143         } else
1144                 vc_resize(vc, new_cols, new_rows);
1145
1146         if (logo)
1147                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
1148
1149         if (vc == svc && softback_buf)
1150                 fbcon_update_softback(vc);
1151
1152         if (ops->rotate_font && ops->rotate_font(info, vc)) {
1153                 ops->rotate = FB_ROTATE_UR;
1154                 set_blitting_type(vc, info);
1155         }
1156
1157         ops->p = &fb_display[fg_console];
1158 }
1159
1160 static void fbcon_free_font(struct display *p, bool freefont)
1161 {
1162         if (freefont && p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
1163                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
1164         p->fontdata = NULL;
1165         p->userfont = 0;
1166 }
1167
1168 static void fbcon_deinit(struct vc_data *vc)
1169 {
1170         struct display *p = &fb_display[vc->vc_num];
1171         struct fb_info *info;
1172         struct fbcon_ops *ops;
1173         int idx;
1174         bool free_font = true;
1175
1176         idx = con2fb_map[vc->vc_num];
1177
1178         if (idx == -1)
1179                 goto finished;
1180
1181         info = registered_fb[idx];
1182
1183         if (!info)
1184                 goto finished;
1185
1186         if (info->flags & FBINFO_MISC_FIRMWARE)
1187                 free_font = false;
1188         ops = info->fbcon_par;
1189
1190         if (!ops)
1191                 goto finished;
1192
1193         if (con_is_visible(vc))
1194                 fbcon_del_cursor_timer(info);
1195
1196         ops->flags &= ~FBCON_FLAGS_INIT;
1197 finished:
1198
1199         fbcon_free_font(p, free_font);
1200         if (free_font)
1201                 vc->vc_font.data = NULL;
1202
1203         if (!con_is_bound(&fb_con))
1204                 fbcon_exit();
1205
1206         return;
1207 }
1208
1209 /* ====================================================================== */
1210
1211 /*  fbcon_XXX routines - interface used by the world
1212  *
1213  *  This system is now divided into two levels because of complications
1214  *  caused by hardware scrolling. Top level functions:
1215  *
1216  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1217  *
1218  *  handles y values in range [0, scr_height-1] that correspond to real
1219  *  screen positions. y_wrap shift means that first line of bitmap may be
1220  *  anywhere on this display. These functions convert lineoffsets to
1221  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1222  *
1223  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1224  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1225  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1226  *
1227  *  WARNING:
1228  *
1229  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1230  *  Implies should only really hardware scroll in rows. Only reason for
1231  *  restriction is simplicity & efficiency at the moment.
1232  */
1233
1234 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1235                         int width)
1236 {
1237         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1238         struct fbcon_ops *ops = info->fbcon_par;
1239
1240         struct display *p = &fb_display[vc->vc_num];
1241         u_int y_break;
1242
1243         if (fbcon_is_inactive(vc, info))
1244                 return;
1245
1246         if (!height || !width)
1247                 return;
1248
1249         if (sy < vc->vc_top && vc->vc_top == logo_lines) {
1250                 vc->vc_top = 0;
1251                 /*
1252                  * If the font dimensions are not an integral of the display
1253                  * dimensions then the ops->clear below won't end up clearing
1254                  * the margins.  Call clear_margins here in case the logo
1255                  * bitmap stretched into the margin area.
1256                  */
1257                 fbcon_clear_margins(vc, 0);
1258         }
1259
1260         /* Split blits that cross physical y_wrap boundary */
1261
1262         y_break = p->vrows - p->yscroll;
1263         if (sy < y_break && sy + height - 1 >= y_break) {
1264                 u_int b = y_break - sy;
1265                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1266                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1267                                  width);
1268         } else
1269                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1270 }
1271
1272 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1273                         int count, int ypos, int xpos)
1274 {
1275         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1276         struct display *p = &fb_display[vc->vc_num];
1277         struct fbcon_ops *ops = info->fbcon_par;
1278
1279         if (!fbcon_is_inactive(vc, info))
1280                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1281                            get_color(vc, info, scr_readw(s), 1),
1282                            get_color(vc, info, scr_readw(s), 0));
1283 }
1284
1285 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1286 {
1287         unsigned short chr;
1288
1289         scr_writew(c, &chr);
1290         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1291 }
1292
1293 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1294 {
1295         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1296         struct fbcon_ops *ops = info->fbcon_par;
1297
1298         if (!fbcon_is_inactive(vc, info))
1299                 ops->clear_margins(vc, info, bottom_only);
1300 }
1301
1302 static void fbcon_cursor(struct vc_data *vc, int mode)
1303 {
1304         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1305         struct fbcon_ops *ops = info->fbcon_par;
1306         int y;
1307         int c = scr_readw((u16 *) vc->vc_pos);
1308
1309         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
1310
1311         if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
1312                 return;
1313
1314         if (vc->vc_cursor_type & 0x10)
1315                 fbcon_del_cursor_timer(info);
1316         else
1317                 fbcon_add_cursor_timer(info);
1318
1319         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1320         if (mode & CM_SOFTBACK) {
1321                 mode &= ~CM_SOFTBACK;
1322                 y = softback_lines;
1323         } else {
1324                 if (softback_lines)
1325                         fbcon_set_origin(vc);
1326                 y = 0;
1327         }
1328
1329         ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
1330                     get_color(vc, info, c, 0));
1331 }
1332
1333 static int scrollback_phys_max = 0;
1334 static int scrollback_max = 0;
1335 static int scrollback_current = 0;
1336
1337 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1338                            int unit)
1339 {
1340         struct display *p, *t;
1341         struct vc_data **default_mode, *vc;
1342         struct vc_data *svc;
1343         struct fbcon_ops *ops = info->fbcon_par;
1344         int rows, cols, charcnt = 256;
1345
1346         p = &fb_display[unit];
1347
1348         if (var_to_display(p, var, info))
1349                 return;
1350
1351         vc = vc_cons[unit].d;
1352
1353         if (!vc)
1354                 return;
1355
1356         default_mode = vc->vc_display_fg;
1357         svc = *default_mode;
1358         t = &fb_display[svc->vc_num];
1359
1360         if (!vc->vc_font.data) {
1361                 vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
1362                 vc->vc_font.width = (*default_mode)->vc_font.width;
1363                 vc->vc_font.height = (*default_mode)->vc_font.height;
1364                 p->userfont = t->userfont;
1365                 if (p->userfont)
1366                         REFCOUNT(p->fontdata)++;
1367         }
1368         if (p->userfont)
1369                 charcnt = FNTCHARCNT(p->fontdata);
1370
1371         var->activate = FB_ACTIVATE_NOW;
1372         info->var.activate = var->activate;
1373         var->yoffset = info->var.yoffset;
1374         var->xoffset = info->var.xoffset;
1375         fb_set_var(info, var);
1376         ops->var = info->var;
1377         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
1378         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1379         if (charcnt == 256) {
1380                 vc->vc_hi_font_mask = 0;
1381         } else {
1382                 vc->vc_hi_font_mask = 0x100;
1383                 if (vc->vc_can_do_color)
1384                         vc->vc_complement_mask <<= 1;
1385         }
1386
1387         if (!*svc->vc_uni_pagedir_loc)
1388                 con_set_default_unimap(svc);
1389         if (!*vc->vc_uni_pagedir_loc)
1390                 con_copy_unimap(vc, svc);
1391
1392         cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
1393         rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
1394         cols /= vc->vc_font.width;
1395         rows /= vc->vc_font.height;
1396         vc_resize(vc, cols, rows);
1397
1398         if (con_is_visible(vc)) {
1399                 update_screen(vc);
1400                 if (softback_buf)
1401                         fbcon_update_softback(vc);
1402         }
1403 }
1404
1405 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1406 {
1407         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1408         struct fbcon_ops *ops = info->fbcon_par;
1409         struct display *p = &fb_display[vc->vc_num];
1410
1411         p->yscroll += count;
1412         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1413                 p->yscroll -= p->vrows;
1414         ops->var.xoffset = 0;
1415         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1416         ops->var.vmode |= FB_VMODE_YWRAP;
1417         ops->update_start(info);
1418         scrollback_max += count;
1419         if (scrollback_max > scrollback_phys_max)
1420                 scrollback_max = scrollback_phys_max;
1421         scrollback_current = 0;
1422 }
1423
1424 static __inline__ void ywrap_down(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 < 0)     /* 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 < 0)
1439                 scrollback_max = 0;
1440         scrollback_current = 0;
1441 }
1442
1443 static __inline__ void ypan_up(struct vc_data *vc, int count)
1444 {
1445         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1446         struct display *p = &fb_display[vc->vc_num];
1447         struct fbcon_ops *ops = info->fbcon_par;
1448
1449         p->yscroll += count;
1450         if (p->yscroll > p->vrows - vc->vc_rows) {
1451                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1452                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1453                 p->yscroll -= p->vrows - vc->vc_rows;
1454         }
1455
1456         ops->var.xoffset = 0;
1457         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1458         ops->var.vmode &= ~FB_VMODE_YWRAP;
1459         ops->update_start(info);
1460         fbcon_clear_margins(vc, 1);
1461         scrollback_max += count;
1462         if (scrollback_max > scrollback_phys_max)
1463                 scrollback_max = scrollback_phys_max;
1464         scrollback_current = 0;
1465 }
1466
1467 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1468 {
1469         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1470         struct fbcon_ops *ops = info->fbcon_par;
1471         struct display *p = &fb_display[vc->vc_num];
1472
1473         p->yscroll += count;
1474
1475         if (p->yscroll > p->vrows - vc->vc_rows) {
1476                 p->yscroll -= p->vrows - vc->vc_rows;
1477                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1478         }
1479
1480         ops->var.xoffset = 0;
1481         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1482         ops->var.vmode &= ~FB_VMODE_YWRAP;
1483         ops->update_start(info);
1484         fbcon_clear_margins(vc, 1);
1485         scrollback_max += count;
1486         if (scrollback_max > scrollback_phys_max)
1487                 scrollback_max = scrollback_phys_max;
1488         scrollback_current = 0;
1489 }
1490
1491 static __inline__ void ypan_down(struct vc_data *vc, int count)
1492 {
1493         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1494         struct display *p = &fb_display[vc->vc_num];
1495         struct fbcon_ops *ops = info->fbcon_par;
1496
1497         p->yscroll -= count;
1498         if (p->yscroll < 0) {
1499                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1500                             0, vc->vc_rows, vc->vc_cols);
1501                 p->yscroll += p->vrows - vc->vc_rows;
1502         }
1503
1504         ops->var.xoffset = 0;
1505         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1506         ops->var.vmode &= ~FB_VMODE_YWRAP;
1507         ops->update_start(info);
1508         fbcon_clear_margins(vc, 1);
1509         scrollback_max -= count;
1510         if (scrollback_max < 0)
1511                 scrollback_max = 0;
1512         scrollback_current = 0;
1513 }
1514
1515 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1516 {
1517         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1518         struct fbcon_ops *ops = info->fbcon_par;
1519         struct display *p = &fb_display[vc->vc_num];
1520
1521         p->yscroll -= count;
1522
1523         if (p->yscroll < 0) {
1524                 p->yscroll += p->vrows - vc->vc_rows;
1525                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1526         }
1527
1528         ops->var.xoffset = 0;
1529         ops->var.yoffset = p->yscroll * vc->vc_font.height;
1530         ops->var.vmode &= ~FB_VMODE_YWRAP;
1531         ops->update_start(info);
1532         fbcon_clear_margins(vc, 1);
1533         scrollback_max -= count;
1534         if (scrollback_max < 0)
1535                 scrollback_max = 0;
1536         scrollback_current = 0;
1537 }
1538
1539 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1540                                   long delta)
1541 {
1542         int count = vc->vc_rows;
1543         unsigned short *d, *s;
1544         unsigned long n;
1545         int line = 0;
1546
1547         d = (u16 *) softback_curr;
1548         if (d == (u16 *) softback_in)
1549                 d = (u16 *) vc->vc_origin;
1550         n = softback_curr + delta * vc->vc_size_row;
1551         softback_lines -= delta;
1552         if (delta < 0) {
1553                 if (softback_curr < softback_top && n < softback_buf) {
1554                         n += softback_end - softback_buf;
1555                         if (n < softback_top) {
1556                                 softback_lines -=
1557                                     (softback_top - n) / vc->vc_size_row;
1558                                 n = softback_top;
1559                         }
1560                 } else if (softback_curr >= softback_top
1561                            && n < softback_top) {
1562                         softback_lines -=
1563                             (softback_top - n) / vc->vc_size_row;
1564                         n = softback_top;
1565                 }
1566         } else {
1567                 if (softback_curr > softback_in && n >= softback_end) {
1568                         n += softback_buf - softback_end;
1569                         if (n > softback_in) {
1570                                 n = softback_in;
1571                                 softback_lines = 0;
1572                         }
1573                 } else if (softback_curr <= softback_in && n > softback_in) {
1574                         n = softback_in;
1575                         softback_lines = 0;
1576                 }
1577         }
1578         if (n == softback_curr)
1579                 return;
1580         softback_curr = n;
1581         s = (u16 *) softback_curr;
1582         if (s == (u16 *) softback_in)
1583                 s = (u16 *) vc->vc_origin;
1584         while (count--) {
1585                 unsigned short *start;
1586                 unsigned short *le;
1587                 unsigned short c;
1588                 int x = 0;
1589                 unsigned short attr = 1;
1590
1591                 start = s;
1592                 le = advance_row(s, 1);
1593                 do {
1594                         c = scr_readw(s);
1595                         if (attr != (c & 0xff00)) {
1596                                 attr = c & 0xff00;
1597                                 if (s > start) {
1598                                         fbcon_putcs(vc, start, s - start,
1599                                                     line, x);
1600                                         x += s - start;
1601                                         start = s;
1602                                 }
1603                         }
1604                         if (c == scr_readw(d)) {
1605                                 if (s > start) {
1606                                         fbcon_putcs(vc, start, s - start,
1607                                                     line, x);
1608                                         x += s - start + 1;
1609                                         start = s + 1;
1610                                 } else {
1611                                         x++;
1612                                         start++;
1613                                 }
1614                         }
1615                         s++;
1616                         d++;
1617                 } while (s < le);
1618                 if (s > start)
1619                         fbcon_putcs(vc, start, s - start, line, x);
1620                 line++;
1621                 if (d == (u16 *) softback_end)
1622                         d = (u16 *) softback_buf;
1623                 if (d == (u16 *) softback_in)
1624                         d = (u16 *) vc->vc_origin;
1625                 if (s == (u16 *) softback_end)
1626                         s = (u16 *) softback_buf;
1627                 if (s == (u16 *) softback_in)
1628                         s = (u16 *) vc->vc_origin;
1629         }
1630 }
1631
1632 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1633                               int line, int count, int dy)
1634 {
1635         unsigned short *s = (unsigned short *)
1636                 (vc->vc_origin + vc->vc_size_row * line);
1637
1638         while (count--) {
1639                 unsigned short *start = s;
1640                 unsigned short *le = advance_row(s, 1);
1641                 unsigned short c;
1642                 int x = 0;
1643                 unsigned short attr = 1;
1644
1645                 do {
1646                         c = scr_readw(s);
1647                         if (attr != (c & 0xff00)) {
1648                                 attr = c & 0xff00;
1649                                 if (s > start) {
1650                                         fbcon_putcs(vc, start, s - start,
1651                                                     dy, x);
1652                                         x += s - start;
1653                                         start = s;
1654                                 }
1655                         }
1656                         console_conditional_schedule();
1657                         s++;
1658                 } while (s < le);
1659                 if (s > start)
1660                         fbcon_putcs(vc, start, s - start, dy, x);
1661                 console_conditional_schedule();
1662                 dy++;
1663         }
1664 }
1665
1666 static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
1667                         struct display *p, int line, int count, int ycount)
1668 {
1669         int offset = ycount * vc->vc_cols;
1670         unsigned short *d = (unsigned short *)
1671             (vc->vc_origin + vc->vc_size_row * line);
1672         unsigned short *s = d + offset;
1673         struct fbcon_ops *ops = info->fbcon_par;
1674
1675         while (count--) {
1676                 unsigned short *start = s;
1677                 unsigned short *le = advance_row(s, 1);
1678                 unsigned short c;
1679                 int x = 0;
1680
1681                 do {
1682                         c = scr_readw(s);
1683
1684                         if (c == scr_readw(d)) {
1685                                 if (s > start) {
1686                                         ops->bmove(vc, info, line + ycount, x,
1687                                                    line, x, 1, s-start);
1688                                         x += s - start + 1;
1689                                         start = s + 1;
1690                                 } else {
1691                                         x++;
1692                                         start++;
1693                                 }
1694                         }
1695
1696                         scr_writew(c, d);
1697                         console_conditional_schedule();
1698                         s++;
1699                         d++;
1700                 } while (s < le);
1701                 if (s > start)
1702                         ops->bmove(vc, info, line + ycount, x, line, x, 1,
1703                                    s-start);
1704                 console_conditional_schedule();
1705                 if (ycount > 0)
1706                         line++;
1707                 else {
1708                         line--;
1709                         /* NOTE: We subtract two lines from these pointers */
1710                         s -= vc->vc_size_row;
1711                         d -= vc->vc_size_row;
1712                 }
1713         }
1714 }
1715
1716 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1717                          int line, int count, int offset)
1718 {
1719         unsigned short *d = (unsigned short *)
1720             (vc->vc_origin + vc->vc_size_row * line);
1721         unsigned short *s = d + offset;
1722
1723         while (count--) {
1724                 unsigned short *start = s;
1725                 unsigned short *le = advance_row(s, 1);
1726                 unsigned short c;
1727                 int x = 0;
1728                 unsigned short attr = 1;
1729
1730                 do {
1731                         c = scr_readw(s);
1732                         if (attr != (c & 0xff00)) {
1733                                 attr = c & 0xff00;
1734                                 if (s > start) {
1735                                         fbcon_putcs(vc, start, s - start,
1736                                                     line, x);
1737                                         x += s - start;
1738                                         start = s;
1739                                 }
1740                         }
1741                         if (c == scr_readw(d)) {
1742                                 if (s > start) {
1743                                         fbcon_putcs(vc, start, s - start,
1744                                                      line, x);
1745                                         x += s - start + 1;
1746                                         start = s + 1;
1747                                 } else {
1748                                         x++;
1749                                         start++;
1750                                 }
1751                         }
1752                         scr_writew(c, d);
1753                         console_conditional_schedule();
1754                         s++;
1755                         d++;
1756                 } while (s < le);
1757                 if (s > start)
1758                         fbcon_putcs(vc, start, s - start, line, x);
1759                 console_conditional_schedule();
1760                 if (offset > 0)
1761                         line++;
1762                 else {
1763                         line--;
1764                         /* NOTE: We subtract two lines from these pointers */
1765                         s -= vc->vc_size_row;
1766                         d -= vc->vc_size_row;
1767                 }
1768         }
1769 }
1770
1771 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1772                                        int count)
1773 {
1774         unsigned short *p;
1775
1776         if (vc->vc_num != fg_console)
1777                 return;
1778         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1779
1780         while (count) {
1781                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1782                 count--;
1783                 p = advance_row(p, 1);
1784                 softback_in += vc->vc_size_row;
1785                 if (softback_in == softback_end)
1786                         softback_in = softback_buf;
1787                 if (softback_in == softback_top) {
1788                         softback_top += vc->vc_size_row;
1789                         if (softback_top == softback_end)
1790                                 softback_top = softback_buf;
1791                 }
1792         }
1793         softback_curr = softback_in;
1794 }
1795
1796 static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
1797                 enum con_scroll dir, unsigned int count)
1798 {
1799         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1800         struct display *p = &fb_display[vc->vc_num];
1801         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1802
1803         if (fbcon_is_inactive(vc, info))
1804                 return true;
1805
1806         fbcon_cursor(vc, CM_ERASE);
1807
1808         /*
1809          * ++Geert: Only use ywrap/ypan if the console is in text mode
1810          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1811          *           whole screen (prevents flicker).
1812          */
1813
1814         switch (dir) {
1815         case SM_UP:
1816                 if (count > vc->vc_rows)        /* Maximum realistic size */
1817                         count = vc->vc_rows;
1818                 if (softback_top)
1819                         fbcon_softback_note(vc, t, count);
1820                 if (logo_shown >= 0)
1821                         goto redraw_up;
1822                 switch (p->scrollmode) {
1823                 case SCROLL_MOVE:
1824                         fbcon_redraw_blit(vc, info, p, t, b - t - count,
1825                                      count);
1826                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1827                         scr_memsetw((unsigned short *) (vc->vc_origin +
1828                                                         vc->vc_size_row *
1829                                                         (b - count)),
1830                                     vc->vc_video_erase_char,
1831                                     vc->vc_size_row * count);
1832                         return true;
1833                         break;
1834
1835                 case SCROLL_WRAP_MOVE:
1836                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1837                                 if (t > 0)
1838                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1839                                                     vc->vc_cols);
1840                                 ywrap_up(vc, count);
1841                                 if (vc->vc_rows - b > 0)
1842                                         fbcon_bmove(vc, b - count, 0, b, 0,
1843                                                     vc->vc_rows - b,
1844                                                     vc->vc_cols);
1845                         } else if (info->flags & FBINFO_READS_FAST)
1846                                 fbcon_bmove(vc, t + count, 0, t, 0,
1847                                             b - t - count, vc->vc_cols);
1848                         else
1849                                 goto redraw_up;
1850                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1851                         break;
1852
1853                 case SCROLL_PAN_REDRAW:
1854                         if ((p->yscroll + count <=
1855                              2 * (p->vrows - vc->vc_rows))
1856                             && ((!scroll_partial && (b - t == vc->vc_rows))
1857                                 || (scroll_partial
1858                                     && (b - t - count >
1859                                         3 * vc->vc_rows >> 2)))) {
1860                                 if (t > 0)
1861                                         fbcon_redraw_move(vc, p, 0, t, count);
1862                                 ypan_up_redraw(vc, t, count);
1863                                 if (vc->vc_rows - b > 0)
1864                                         fbcon_redraw_move(vc, p, b,
1865                                                           vc->vc_rows - b, b);
1866                         } else
1867                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1868                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1869                         break;
1870
1871                 case SCROLL_PAN_MOVE:
1872                         if ((p->yscroll + count <=
1873                              2 * (p->vrows - vc->vc_rows))
1874                             && ((!scroll_partial && (b - t == vc->vc_rows))
1875                                 || (scroll_partial
1876                                     && (b - t - count >
1877                                         3 * vc->vc_rows >> 2)))) {
1878                                 if (t > 0)
1879                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1880                                                     vc->vc_cols);
1881                                 ypan_up(vc, count);
1882                                 if (vc->vc_rows - b > 0)
1883                                         fbcon_bmove(vc, b - count, 0, b, 0,
1884                                                     vc->vc_rows - b,
1885                                                     vc->vc_cols);
1886                         } else if (info->flags & FBINFO_READS_FAST)
1887                                 fbcon_bmove(vc, t + count, 0, t, 0,
1888                                             b - t - count, vc->vc_cols);
1889                         else
1890                                 goto redraw_up;
1891                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1892                         break;
1893
1894                 case SCROLL_REDRAW:
1895                       redraw_up:
1896                         fbcon_redraw(vc, p, t, b - t - count,
1897                                      count * vc->vc_cols);
1898                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1899                         scr_memsetw((unsigned short *) (vc->vc_origin +
1900                                                         vc->vc_size_row *
1901                                                         (b - count)),
1902                                     vc->vc_video_erase_char,
1903                                     vc->vc_size_row * count);
1904                         return true;
1905                 }
1906                 break;
1907
1908         case SM_DOWN:
1909                 if (count > vc->vc_rows)        /* Maximum realistic size */
1910                         count = vc->vc_rows;
1911                 if (logo_shown >= 0)
1912                         goto redraw_down;
1913                 switch (p->scrollmode) {
1914                 case SCROLL_MOVE:
1915                         fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
1916                                      -count);
1917                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1918                         scr_memsetw((unsigned short *) (vc->vc_origin +
1919                                                         vc->vc_size_row *
1920                                                         t),
1921                                     vc->vc_video_erase_char,
1922                                     vc->vc_size_row * count);
1923                         return true;
1924                         break;
1925
1926                 case SCROLL_WRAP_MOVE:
1927                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1928                                 if (vc->vc_rows - b > 0)
1929                                         fbcon_bmove(vc, b, 0, b - count, 0,
1930                                                     vc->vc_rows - b,
1931                                                     vc->vc_cols);
1932                                 ywrap_down(vc, count);
1933                                 if (t > 0)
1934                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1935                                                     vc->vc_cols);
1936                         } else if (info->flags & FBINFO_READS_FAST)
1937                                 fbcon_bmove(vc, t, 0, t + count, 0,
1938                                             b - t - count, vc->vc_cols);
1939                         else
1940                                 goto redraw_down;
1941                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1942                         break;
1943
1944                 case SCROLL_PAN_MOVE:
1945                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1946                             && ((!scroll_partial && (b - t == vc->vc_rows))
1947                                 || (scroll_partial
1948                                     && (b - t - count >
1949                                         3 * vc->vc_rows >> 2)))) {
1950                                 if (vc->vc_rows - b > 0)
1951                                         fbcon_bmove(vc, b, 0, b - count, 0,
1952                                                     vc->vc_rows - b,
1953                                                     vc->vc_cols);
1954                                 ypan_down(vc, count);
1955                                 if (t > 0)
1956                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1957                                                     vc->vc_cols);
1958                         } else if (info->flags & FBINFO_READS_FAST)
1959                                 fbcon_bmove(vc, t, 0, t + count, 0,
1960                                             b - t - count, vc->vc_cols);
1961                         else
1962                                 goto redraw_down;
1963                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1964                         break;
1965
1966                 case SCROLL_PAN_REDRAW:
1967                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1968                             && ((!scroll_partial && (b - t == vc->vc_rows))
1969                                 || (scroll_partial
1970                                     && (b - t - count >
1971                                         3 * vc->vc_rows >> 2)))) {
1972                                 if (vc->vc_rows - b > 0)
1973                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1974                                                           b - count);
1975                                 ypan_down_redraw(vc, t, count);
1976                                 if (t > 0)
1977                                         fbcon_redraw_move(vc, p, count, t, 0);
1978                         } else
1979                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1980                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1981                         break;
1982
1983                 case SCROLL_REDRAW:
1984                       redraw_down:
1985                         fbcon_redraw(vc, p, b - 1, b - t - count,
1986                                      -count * vc->vc_cols);
1987                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1988                         scr_memsetw((unsigned short *) (vc->vc_origin +
1989                                                         vc->vc_size_row *
1990                                                         t),
1991                                     vc->vc_video_erase_char,
1992                                     vc->vc_size_row * count);
1993                         return true;
1994                 }
1995         }
1996         return false;
1997 }
1998
1999
2000 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
2001                         int height, int width)
2002 {
2003         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2004         struct display *p = &fb_display[vc->vc_num];
2005
2006         if (fbcon_is_inactive(vc, info))
2007                 return;
2008
2009         if (!width || !height)
2010                 return;
2011
2012         /*  Split blits that cross physical y_wrap case.
2013          *  Pathological case involves 4 blits, better to use recursive
2014          *  code rather than unrolled case
2015          *
2016          *  Recursive invocations don't need to erase the cursor over and
2017          *  over again, so we use fbcon_bmove_rec()
2018          */
2019         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
2020                         p->vrows - p->yscroll);
2021 }
2022
2023 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
2024                             int dy, int dx, int height, int width, u_int y_break)
2025 {
2026         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2027         struct fbcon_ops *ops = info->fbcon_par;
2028         u_int b;
2029
2030         if (sy < y_break && sy + height > y_break) {
2031                 b = y_break - sy;
2032                 if (dy < sy) {  /* Avoid trashing self */
2033                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2034                                         y_break);
2035                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2036                                         height - b, width, y_break);
2037                 } else {
2038                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2039                                         height - b, width, y_break);
2040                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2041                                         y_break);
2042                 }
2043                 return;
2044         }
2045
2046         if (dy < y_break && dy + height > y_break) {
2047                 b = y_break - dy;
2048                 if (dy < sy) {  /* Avoid trashing self */
2049                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2050                                         y_break);
2051                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2052                                         height - b, width, y_break);
2053                 } else {
2054                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
2055                                         height - b, width, y_break);
2056                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
2057                                         y_break);
2058                 }
2059                 return;
2060         }
2061         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
2062                    height, width);
2063 }
2064
2065 static void updatescrollmode(struct display *p,
2066                                         struct fb_info *info,
2067                                         struct vc_data *vc)
2068 {
2069         struct fbcon_ops *ops = info->fbcon_par;
2070         int fh = vc->vc_font.height;
2071         int cap = info->flags;
2072         u16 t = 0;
2073         int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
2074                                   info->fix.xpanstep);
2075         int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
2076         int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2077         int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
2078                                    info->var.xres_virtual);
2079         int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
2080                 divides(ypan, vc->vc_font.height) && vyres > yres;
2081         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
2082                 divides(ywrap, vc->vc_font.height) &&
2083                 divides(vc->vc_font.height, vyres) &&
2084                 divides(vc->vc_font.height, yres);
2085         int reading_fast = cap & FBINFO_READS_FAST;
2086         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
2087                 !(cap & FBINFO_HWACCEL_DISABLED);
2088         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
2089                 !(cap & FBINFO_HWACCEL_DISABLED);
2090
2091         p->vrows = vyres/fh;
2092         if (yres > (fh * (vc->vc_rows + 1)))
2093                 p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
2094         if ((yres % fh) && (vyres % fh < yres % fh))
2095                 p->vrows--;
2096
2097         if (good_wrap || good_pan) {
2098                 if (reading_fast || fast_copyarea)
2099                         p->scrollmode = good_wrap ?
2100                                 SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
2101                 else
2102                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
2103                                 SCROLL_PAN_REDRAW;
2104         } else {
2105                 if (reading_fast || (fast_copyarea && !fast_imageblit))
2106                         p->scrollmode = SCROLL_MOVE;
2107                 else
2108                         p->scrollmode = SCROLL_REDRAW;
2109         }
2110 }
2111
2112 static int fbcon_resize(struct vc_data *vc, unsigned int width,
2113                         unsigned int height, unsigned int user)
2114 {
2115         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2116         struct fbcon_ops *ops = info->fbcon_par;
2117         struct display *p = &fb_display[vc->vc_num];
2118         struct fb_var_screeninfo var = info->var;
2119         int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;
2120
2121         virt_w = FBCON_SWAP(ops->rotate, width, height);
2122         virt_h = FBCON_SWAP(ops->rotate, height, width);
2123         virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
2124                                  vc->vc_font.height);
2125         virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
2126                                  vc->vc_font.width);
2127         var.xres = virt_w * virt_fw;
2128         var.yres = virt_h * virt_fh;
2129         x_diff = info->var.xres - var.xres;
2130         y_diff = info->var.yres - var.yres;
2131         if (x_diff < 0 || x_diff > virt_fw ||
2132             y_diff < 0 || y_diff > virt_fh) {
2133                 const struct fb_videomode *mode;
2134
2135                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
2136                 mode = fb_find_best_mode(&var, &info->modelist);
2137                 if (mode == NULL)
2138                         return -EINVAL;
2139                 display_to_var(&var, p);
2140                 fb_videomode_to_var(&var, mode);
2141
2142                 if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
2143                         return -EINVAL;
2144
2145                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
2146                 if (con_is_visible(vc)) {
2147                         var.activate = FB_ACTIVATE_NOW |
2148                                 FB_ACTIVATE_FORCE;
2149                         fb_set_var(info, &var);
2150                 }
2151                 var_to_display(p, &info->var, info);
2152                 ops->var = info->var;
2153         }
2154         updatescrollmode(p, info, vc);
2155         return 0;
2156 }
2157
2158 static int fbcon_switch(struct vc_data *vc)
2159 {
2160         struct fb_info *info, *old_info = NULL;
2161         struct fbcon_ops *ops;
2162         struct display *p = &fb_display[vc->vc_num];
2163         struct fb_var_screeninfo var;
2164         int i, ret, prev_console, charcnt = 256;
2165
2166         info = registered_fb[con2fb_map[vc->vc_num]];
2167         ops = info->fbcon_par;
2168
2169         if (softback_top) {
2170                 if (softback_lines)
2171                         fbcon_set_origin(vc);
2172                 softback_top = softback_curr = softback_in = softback_buf;
2173                 softback_lines = 0;
2174                 fbcon_update_softback(vc);
2175         }
2176
2177         if (logo_shown >= 0) {
2178                 struct vc_data *conp2 = vc_cons[logo_shown].d;
2179
2180                 if (conp2->vc_top == logo_lines
2181                     && conp2->vc_bottom == conp2->vc_rows)
2182                         conp2->vc_top = 0;
2183                 logo_shown = FBCON_LOGO_CANSHOW;
2184         }
2185
2186         prev_console = ops->currcon;
2187         if (prev_console != -1)
2188                 old_info = registered_fb[con2fb_map[prev_console]];
2189         /*
2190          * FIXME: If we have multiple fbdev's loaded, we need to
2191          * update all info->currcon.  Perhaps, we can place this
2192          * in a centralized structure, but this might break some
2193          * drivers.
2194          *
2195          * info->currcon = vc->vc_num;
2196          */
2197         for (i = 0; i < FB_MAX; i++) {
2198                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
2199                         struct fbcon_ops *o = registered_fb[i]->fbcon_par;
2200
2201                         o->currcon = vc->vc_num;
2202                 }
2203         }
2204         memset(&var, 0, sizeof(struct fb_var_screeninfo));
2205         display_to_var(&var, p);
2206         var.activate = FB_ACTIVATE_NOW;
2207
2208         /*
2209          * make sure we don't unnecessarily trip the memcmp()
2210          * in fb_set_var()
2211          */
2212         info->var.activate = var.activate;
2213         var.vmode |= info->var.vmode & ~FB_VMODE_MASK;
2214         fb_set_var(info, &var);
2215         ops->var = info->var;
2216
2217         if (old_info != NULL && (old_info != info ||
2218                                  info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
2219                 if (info->fbops->fb_set_par) {
2220                         ret = info->fbops->fb_set_par(info);
2221
2222                         if (ret)
2223                                 printk(KERN_ERR "fbcon_switch: detected "
2224                                         "unhandled fb_set_par error, "
2225                                         "error code %d\n", ret);
2226                 }
2227
2228                 if (old_info != info)
2229                         fbcon_del_cursor_timer(old_info);
2230         }
2231
2232         if (fbcon_is_inactive(vc, info) ||
2233             ops->blank_state != FB_BLANK_UNBLANK)
2234                 fbcon_del_cursor_timer(info);
2235         else
2236                 fbcon_add_cursor_timer(info);
2237
2238         set_blitting_type(vc, info);
2239         ops->cursor_reset = 1;
2240
2241         if (ops->rotate_font && ops->rotate_font(info, vc)) {
2242                 ops->rotate = FB_ROTATE_UR;
2243                 set_blitting_type(vc, info);
2244         }
2245
2246         vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
2247         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
2248
2249         if (p->userfont)
2250                 charcnt = FNTCHARCNT(vc->vc_font.data);
2251
2252         if (charcnt > 256)
2253                 vc->vc_complement_mask <<= 1;
2254
2255         updatescrollmode(p, info, vc);
2256
2257         switch (p->scrollmode) {
2258         case SCROLL_WRAP_MOVE:
2259                 scrollback_phys_max = p->vrows - vc->vc_rows;
2260                 break;
2261         case SCROLL_PAN_MOVE:
2262         case SCROLL_PAN_REDRAW:
2263                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
2264                 if (scrollback_phys_max < 0)
2265                         scrollback_phys_max = 0;
2266                 break;
2267         default:
2268                 scrollback_phys_max = 0;
2269                 break;
2270         }
2271
2272         scrollback_max = 0;
2273         scrollback_current = 0;
2274
2275         if (!fbcon_is_inactive(vc, info)) {
2276             ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2277             ops->update_start(info);
2278         }
2279
2280         fbcon_set_palette(vc, color_table);
2281         fbcon_clear_margins(vc, 0);
2282
2283         if (logo_shown == FBCON_LOGO_DRAW) {
2284
2285                 logo_shown = fg_console;
2286                 /* This is protected above by initmem_freed */
2287                 fb_show_logo(info, ops->rotate);
2288                 update_region(vc,
2289                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2290                               vc->vc_size_row * (vc->vc_bottom -
2291                                                  vc->vc_top) / 2);
2292                 return 0;
2293         }
2294         return 1;
2295 }
2296
2297 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2298                                 int blank)
2299 {
2300         struct fb_event event;
2301
2302         if (blank) {
2303                 unsigned short charmask = vc->vc_hi_font_mask ?
2304                         0x1ff : 0xff;
2305                 unsigned short oldc;
2306
2307                 oldc = vc->vc_video_erase_char;
2308                 vc->vc_video_erase_char &= charmask;
2309                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2310                 vc->vc_video_erase_char = oldc;
2311         }
2312
2313
2314         if (!lock_fb_info(info))
2315                 return;
2316         event.info = info;
2317         event.data = &blank;
2318         fb_notifier_call_chain(FB_EVENT_CONBLANK, &event);
2319         unlock_fb_info(info);
2320 }
2321
2322 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2323 {
2324         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2325         struct fbcon_ops *ops = info->fbcon_par;
2326
2327         if (mode_switch) {
2328                 struct fb_var_screeninfo var = info->var;
2329
2330                 ops->graphics = 1;
2331
2332                 if (!blank) {
2333                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2334                         fb_set_var(info, &var);
2335                         ops->graphics = 0;
2336                         ops->var = info->var;
2337                 }
2338         }
2339
2340         if (!fbcon_is_inactive(vc, info)) {
2341                 if (ops->blank_state != blank) {
2342                         ops->blank_state = blank;
2343                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2344                         ops->cursor_flash = (!blank);
2345
2346                         if (!(info->flags & FBINFO_MISC_USEREVENT))
2347                                 if (fb_blank(info, blank))
2348                                         fbcon_generic_blank(vc, info, blank);
2349                 }
2350
2351                 if (!blank)
2352                         update_screen(vc);
2353         }
2354
2355         if (mode_switch || fbcon_is_inactive(vc, info) ||
2356             ops->blank_state != FB_BLANK_UNBLANK)
2357                 fbcon_del_cursor_timer(info);
2358         else
2359                 fbcon_add_cursor_timer(info);
2360
2361         return 0;
2362 }
2363
2364 static int fbcon_debug_enter(struct vc_data *vc)
2365 {
2366         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2367         struct fbcon_ops *ops = info->fbcon_par;
2368
2369         ops->save_graphics = ops->graphics;
2370         ops->graphics = 0;
2371         if (info->fbops->fb_debug_enter)
2372                 info->fbops->fb_debug_enter(info);
2373         fbcon_set_palette(vc, color_table);
2374         return 0;
2375 }
2376
2377 static int fbcon_debug_leave(struct vc_data *vc)
2378 {
2379         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2380         struct fbcon_ops *ops = info->fbcon_par;
2381
2382         ops->graphics = ops->save_graphics;
2383         if (info->fbops->fb_debug_leave)
2384                 info->fbops->fb_debug_leave(info);
2385         return 0;
2386 }
2387
2388 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2389 {
2390         u8 *fontdata = vc->vc_font.data;
2391         u8 *data = font->data;
2392         int i, j;
2393
2394         font->width = vc->vc_font.width;
2395         font->height = vc->vc_font.height;
2396         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2397         if (!font->data)
2398                 return 0;
2399
2400         if (font->width <= 8) {
2401                 j = vc->vc_font.height;
2402                 for (i = 0; i < font->charcount; i++) {
2403                         memcpy(data, fontdata, j);
2404                         memset(data + j, 0, 32 - j);
2405                         data += 32;
2406                         fontdata += j;
2407                 }
2408         } else if (font->width <= 16) {
2409                 j = vc->vc_font.height * 2;
2410                 for (i = 0; i < font->charcount; i++) {
2411                         memcpy(data, fontdata, j);
2412                         memset(data + j, 0, 64 - j);
2413                         data += 64;
2414                         fontdata += j;
2415                 }
2416         } else if (font->width <= 24) {
2417                 for (i = 0; i < font->charcount; i++) {
2418                         for (j = 0; j < vc->vc_font.height; j++) {
2419                                 *data++ = fontdata[0];
2420                                 *data++ = fontdata[1];
2421                                 *data++ = fontdata[2];
2422                                 fontdata += sizeof(u32);
2423                         }
2424                         memset(data, 0, 3 * (32 - j));
2425                         data += 3 * (32 - j);
2426                 }
2427         } else {
2428                 j = vc->vc_font.height * 4;
2429                 for (i = 0; i < font->charcount; i++) {
2430                         memcpy(data, fontdata, j);
2431                         memset(data + j, 0, 128 - j);
2432                         data += 128;
2433                         fontdata += j;
2434                 }
2435         }
2436         return 0;
2437 }
2438
2439 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2440                              const u8 * data, int userfont)
2441 {
2442         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2443         struct fbcon_ops *ops = info->fbcon_par;
2444         struct display *p = &fb_display[vc->vc_num];
2445         int resize;
2446         int cnt;
2447         char *old_data = NULL;
2448
2449         if (con_is_visible(vc) && softback_lines)
2450                 fbcon_set_origin(vc);
2451
2452         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2453         if (p->userfont)
2454                 old_data = vc->vc_font.data;
2455         if (userfont)
2456                 cnt = FNTCHARCNT(data);
2457         else
2458                 cnt = 256;
2459         vc->vc_font.data = (void *)(p->fontdata = data);
2460         if ((p->userfont = userfont))
2461                 REFCOUNT(data)++;
2462         vc->vc_font.width = w;
2463         vc->vc_font.height = h;
2464         if (vc->vc_hi_font_mask && cnt == 256) {
2465                 vc->vc_hi_font_mask = 0;
2466                 if (vc->vc_can_do_color) {
2467                         vc->vc_complement_mask >>= 1;
2468                         vc->vc_s_complement_mask >>= 1;
2469                 }
2470
2471                 /* ++Edmund: reorder the attribute bits */
2472                 if (vc->vc_can_do_color) {
2473                         unsigned short *cp =
2474                             (unsigned short *) vc->vc_origin;
2475                         int count = vc->vc_screenbuf_size / 2;
2476                         unsigned short c;
2477                         for (; count > 0; count--, cp++) {
2478                                 c = scr_readw(cp);
2479                                 scr_writew(((c & 0xfe00) >> 1) |
2480                                            (c & 0xff), cp);
2481                         }
2482                         c = vc->vc_video_erase_char;
2483                         vc->vc_video_erase_char =
2484                             ((c & 0xfe00) >> 1) | (c & 0xff);
2485                         vc->vc_attr >>= 1;
2486                 }
2487         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2488                 vc->vc_hi_font_mask = 0x100;
2489                 if (vc->vc_can_do_color) {
2490                         vc->vc_complement_mask <<= 1;
2491                         vc->vc_s_complement_mask <<= 1;
2492                 }
2493
2494                 /* ++Edmund: reorder the attribute bits */
2495                 {
2496                         unsigned short *cp =
2497                             (unsigned short *) vc->vc_origin;
2498                         int count = vc->vc_screenbuf_size / 2;
2499                         unsigned short c;
2500                         for (; count > 0; count--, cp++) {
2501                                 unsigned short newc;
2502                                 c = scr_readw(cp);
2503                                 if (vc->vc_can_do_color)
2504                                         newc =
2505                                             ((c & 0xff00) << 1) | (c &
2506                                                                    0xff);
2507                                 else
2508                                         newc = c & ~0x100;
2509                                 scr_writew(newc, cp);
2510                         }
2511                         c = vc->vc_video_erase_char;
2512                         if (vc->vc_can_do_color) {
2513                                 vc->vc_video_erase_char =
2514                                     ((c & 0xff00) << 1) | (c & 0xff);
2515                                 vc->vc_attr <<= 1;
2516                         } else
2517                                 vc->vc_video_erase_char = c & ~0x100;
2518                 }
2519
2520         }
2521
2522         if (resize) {
2523                 int cols, rows;
2524
2525                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2526                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2527                 cols /= w;
2528                 rows /= h;
2529                 vc_resize(vc, cols, rows);
2530                 if (con_is_visible(vc) && softback_buf)
2531                         fbcon_update_softback(vc);
2532         } else if (con_is_visible(vc)
2533                    && vc->vc_mode == KD_TEXT) {
2534                 fbcon_clear_margins(vc, 0);
2535                 update_screen(vc);
2536         }
2537
2538         if (old_data && (--REFCOUNT(old_data) == 0))
2539                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2540         return 0;
2541 }
2542
2543 static int fbcon_copy_font(struct vc_data *vc, int con)
2544 {
2545         struct display *od = &fb_display[con];
2546         struct console_font *f = &vc->vc_font;
2547
2548         if (od->fontdata == f->data)
2549                 return 0;       /* already the same font... */
2550         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2551 }
2552
2553 /*
2554  *  User asked to set font; we are guaranteed that
2555  *      a) width and height are in range 1..32
2556  *      b) charcount does not exceed 512
2557  *  but lets not assume that, since someone might someday want to use larger
2558  *  fonts. And charcount of 512 is small for unicode support.
2559  *
2560  *  However, user space gives the font in 32 rows , regardless of
2561  *  actual font height. So a new API is needed if support for larger fonts
2562  *  is ever implemented.
2563  */
2564
2565 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2566 {
2567         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2568         unsigned charcount = font->charcount;
2569         int w = font->width;
2570         int h = font->height;
2571         int size;
2572         int i, csum;
2573         u8 *new_data, *data = font->data;
2574         int pitch = (font->width+7) >> 3;
2575
2576         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2577          * If not this check should be changed to charcount < 256 */
2578         if (charcount != 256 && charcount != 512)
2579                 return -EINVAL;
2580
2581         /* Make sure drawing engine can handle the font */
2582         if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
2583             !(info->pixmap.blit_y & (1 << (font->height - 1))))
2584                 return -EINVAL;
2585
2586         /* Make sure driver can handle the font length */
2587         if (fbcon_invalid_charcount(info, charcount))
2588                 return -EINVAL;
2589
2590         size = h * pitch * charcount;
2591
2592         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2593
2594         if (!new_data)
2595                 return -ENOMEM;
2596
2597         new_data += FONT_EXTRA_WORDS * sizeof(int);
2598         FNTSIZE(new_data) = size;
2599         FNTCHARCNT(new_data) = charcount;
2600         REFCOUNT(new_data) = 0; /* usage counter */
2601         for (i=0; i< charcount; i++) {
2602                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2603         }
2604
2605         /* Since linux has a nice crc32 function use it for counting font
2606          * checksums. */
2607         csum = crc32(0, new_data, size);
2608
2609         FNTSUM(new_data) = csum;
2610         /* Check if the same font is on some other console already */
2611         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2612                 struct vc_data *tmp = vc_cons[i].d;
2613
2614                 if (fb_display[i].userfont &&
2615                     fb_display[i].fontdata &&
2616                     FNTSUM(fb_display[i].fontdata) == csum &&
2617                     FNTSIZE(fb_display[i].fontdata) == size &&
2618                     tmp->vc_font.width == w &&
2619                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2620                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2621                         new_data = (u8 *)fb_display[i].fontdata;
2622                         break;
2623                 }
2624         }
2625         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2626 }
2627
2628 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2629 {
2630         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2631         const struct font_desc *f;
2632
2633         if (!name)
2634                 f = get_default_font(info->var.xres, info->var.yres,
2635                                      info->pixmap.blit_x, info->pixmap.blit_y);
2636         else if (!(f = find_font(name)))
2637                 return -ENOENT;
2638
2639         font->width = f->width;
2640         font->height = f->height;
2641         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2642 }
2643
2644 static u16 palette_red[16];
2645 static u16 palette_green[16];
2646 static u16 palette_blue[16];
2647
2648 static struct fb_cmap palette_cmap = {
2649         0, 16, palette_red, palette_green, palette_blue, NULL
2650 };
2651
2652 static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table)
2653 {
2654         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2655         int i, j, k, depth;
2656         u8 val;
2657
2658         if (fbcon_is_inactive(vc, info))
2659                 return;
2660
2661         if (!con_is_visible(vc))
2662                 return;
2663
2664         depth = fb_get_color_depth(&info->var, &info->fix);
2665         if (depth > 3) {
2666                 for (i = j = 0; i < 16; i++) {
2667                         k = table[i];
2668                         val = vc->vc_palette[j++];
2669                         palette_red[k] = (val << 8) | val;
2670                         val = vc->vc_palette[j++];
2671                         palette_green[k] = (val << 8) | val;
2672                         val = vc->vc_palette[j++];
2673                         palette_blue[k] = (val << 8) | val;
2674                 }
2675                 palette_cmap.len = 16;
2676                 palette_cmap.start = 0;
2677         /*
2678          * If framebuffer is capable of less than 16 colors,
2679          * use default palette of fbcon.
2680          */
2681         } else
2682                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2683
2684         fb_set_cmap(&palette_cmap, info);
2685 }
2686
2687 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2688 {
2689         unsigned long p;
2690         int line;
2691
2692         if (vc->vc_num != fg_console || !softback_lines)
2693                 return (u16 *) (vc->vc_origin + offset);
2694         line = offset / vc->vc_size_row;
2695         if (line >= softback_lines)
2696                 return (u16 *) (vc->vc_origin + offset -
2697                                 softback_lines * vc->vc_size_row);
2698         p = softback_curr + offset;
2699         if (p >= softback_end)
2700                 p += softback_buf - softback_end;
2701         return (u16 *) p;
2702 }
2703
2704 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2705                                  int *px, int *py)
2706 {
2707         unsigned long ret;
2708         int x, y;
2709
2710         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2711                 unsigned long offset = (pos - vc->vc_origin) / 2;
2712
2713                 x = offset % vc->vc_cols;
2714                 y = offset / vc->vc_cols;
2715                 if (vc->vc_num == fg_console)
2716                         y += softback_lines;
2717                 ret = pos + (vc->vc_cols - x) * 2;
2718         } else if (vc->vc_num == fg_console && softback_lines) {
2719                 unsigned long offset = pos - softback_curr;
2720
2721                 if (pos < softback_curr)
2722                         offset += softback_end - softback_buf;
2723                 offset /= 2;
2724                 x = offset % vc->vc_cols;
2725                 y = offset / vc->vc_cols;
2726                 ret = pos + (vc->vc_cols - x) * 2;
2727                 if (ret == softback_end)
2728                         ret = softback_buf;
2729                 if (ret == softback_in)
2730                         ret = vc->vc_origin;
2731         } else {
2732                 /* Should not happen */
2733                 x = y = 0;
2734                 ret = vc->vc_origin;
2735         }
2736         if (px)
2737                 *px = x;
2738         if (py)
2739                 *py = y;
2740         return ret;
2741 }
2742
2743 /* As we might be inside of softback, we may work with non-contiguous buffer,
2744    that's why we have to use a separate routine. */
2745 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2746 {
2747         while (cnt--) {
2748                 u16 a = scr_readw(p);
2749                 if (!vc->vc_can_do_color)
2750                         a ^= 0x0800;
2751                 else if (vc->vc_hi_font_mask == 0x100)
2752                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2753                             (((a) & 0x0e00) << 4);
2754                 else
2755                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2756                             (((a) & 0x0700) << 4);
2757                 scr_writew(a, p++);
2758                 if (p == (u16 *) softback_end)
2759                         p = (u16 *) softback_buf;
2760                 if (p == (u16 *) softback_in)
2761                         p = (u16 *) vc->vc_origin;
2762         }
2763 }
2764
2765 static void fbcon_scrolldelta(struct vc_data *vc, int lines)
2766 {
2767         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2768         struct fbcon_ops *ops = info->fbcon_par;
2769         struct display *disp = &fb_display[fg_console];
2770         int offset, limit, scrollback_old;
2771
2772         if (softback_top) {
2773                 if (vc->vc_num != fg_console)
2774                         return;
2775                 if (vc->vc_mode != KD_TEXT || !lines)
2776                         return;
2777                 if (logo_shown >= 0) {
2778                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2779
2780                         if (conp2->vc_top == logo_lines
2781                             && conp2->vc_bottom == conp2->vc_rows)
2782                                 conp2->vc_top = 0;
2783                         if (logo_shown == vc->vc_num) {
2784                                 unsigned long p, q;
2785                                 int i;
2786
2787                                 p = softback_in;
2788                                 q = vc->vc_origin +
2789                                     logo_lines * vc->vc_size_row;
2790                                 for (i = 0; i < logo_lines; i++) {
2791                                         if (p == softback_top)
2792                                                 break;
2793                                         if (p == softback_buf)
2794                                                 p = softback_end;
2795                                         p -= vc->vc_size_row;
2796                                         q -= vc->vc_size_row;
2797                                         scr_memcpyw((u16 *) q, (u16 *) p,
2798                                                     vc->vc_size_row);
2799                                 }
2800                                 softback_in = softback_curr = p;
2801                                 update_region(vc, vc->vc_origin,
2802                                               logo_lines * vc->vc_cols);
2803                         }
2804                         logo_shown = FBCON_LOGO_CANSHOW;
2805                 }
2806                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2807                 fbcon_redraw_softback(vc, disp, lines);
2808                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2809                 return;
2810         }
2811
2812         if (!scrollback_phys_max)
2813                 return;
2814
2815         scrollback_old = scrollback_current;
2816         scrollback_current -= lines;
2817         if (scrollback_current < 0)
2818                 scrollback_current = 0;
2819         else if (scrollback_current > scrollback_max)
2820                 scrollback_current = scrollback_max;
2821         if (scrollback_current == scrollback_old)
2822                 return;
2823
2824         if (fbcon_is_inactive(vc, info))
2825                 return;
2826
2827         fbcon_cursor(vc, CM_ERASE);
2828
2829         offset = disp->yscroll - scrollback_current;
2830         limit = disp->vrows;
2831         switch (disp->scrollmode) {
2832         case SCROLL_WRAP_MOVE:
2833                 info->var.vmode |= FB_VMODE_YWRAP;
2834                 break;
2835         case SCROLL_PAN_MOVE:
2836         case SCROLL_PAN_REDRAW:
2837                 limit -= vc->vc_rows;
2838                 info->var.vmode &= ~FB_VMODE_YWRAP;
2839                 break;
2840         }
2841         if (offset < 0)
2842                 offset += limit;
2843         else if (offset >= limit)
2844                 offset -= limit;
2845
2846         ops->var.xoffset = 0;
2847         ops->var.yoffset = offset * vc->vc_font.height;
2848         ops->update_start(info);
2849
2850         if (!scrollback_current)
2851                 fbcon_cursor(vc, CM_DRAW);
2852 }
2853
2854 static int fbcon_set_origin(struct vc_data *vc)
2855 {
2856         if (softback_lines)
2857                 fbcon_scrolldelta(vc, softback_lines);
2858         return 0;
2859 }
2860
2861 static void fbcon_suspended(struct fb_info *info)
2862 {
2863         struct vc_data *vc = NULL;
2864         struct fbcon_ops *ops = info->fbcon_par;
2865
2866         if (!ops || ops->currcon < 0)
2867                 return;
2868         vc = vc_cons[ops->currcon].d;
2869
2870         /* Clear cursor, restore saved data */
2871         fbcon_cursor(vc, CM_ERASE);
2872 }
2873
2874 static void fbcon_resumed(struct fb_info *info)
2875 {
2876         struct vc_data *vc;
2877         struct fbcon_ops *ops = info->fbcon_par;
2878
2879         if (!ops || ops->currcon < 0)
2880                 return;
2881         vc = vc_cons[ops->currcon].d;
2882
2883         update_screen(vc);
2884 }
2885
2886 static void fbcon_modechanged(struct fb_info *info)
2887 {
2888         struct fbcon_ops *ops = info->fbcon_par;
2889         struct vc_data *vc;
2890         struct display *p;
2891         int rows, cols;
2892
2893         if (!ops || ops->currcon < 0)
2894                 return;
2895         vc = vc_cons[ops->currcon].d;
2896         if (vc->vc_mode != KD_TEXT ||
2897             registered_fb[con2fb_map[ops->currcon]] != info)
2898                 return;
2899
2900         p = &fb_display[vc->vc_num];
2901         set_blitting_type(vc, info);
2902
2903         if (con_is_visible(vc)) {
2904                 var_to_display(p, &info->var, info);
2905                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2906                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2907                 cols /= vc->vc_font.width;
2908                 rows /= vc->vc_font.height;
2909                 vc_resize(vc, cols, rows);
2910                 updatescrollmode(p, info, vc);
2911                 scrollback_max = 0;
2912                 scrollback_current = 0;
2913
2914                 if (!fbcon_is_inactive(vc, info)) {
2915                     ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
2916                     ops->update_start(info);
2917                 }
2918
2919                 fbcon_set_palette(vc, color_table);
2920                 update_screen(vc);
2921                 if (softback_buf)
2922                         fbcon_update_softback(vc);
2923         }
2924 }
2925
2926 static void fbcon_set_all_vcs(struct fb_info *info)
2927 {
2928         struct fbcon_ops *ops = info->fbcon_par;
2929         struct vc_data *vc;
2930         struct display *p;
2931         int i, rows, cols, fg = -1;
2932
2933         if (!ops || ops->currcon < 0)
2934                 return;
2935
2936         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2937                 vc = vc_cons[i].d;
2938                 if (!vc || vc->vc_mode != KD_TEXT ||
2939                     registered_fb[con2fb_map[i]] != info)
2940                         continue;
2941
2942                 if (con_is_visible(vc)) {
2943                         fg = i;
2944                         continue;
2945                 }
2946
2947                 p = &fb_display[vc->vc_num];
2948                 set_blitting_type(vc, info);
2949                 var_to_display(p, &info->var, info);
2950                 cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
2951                 rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
2952                 cols /= vc->vc_font.width;
2953                 rows /= vc->vc_font.height;
2954                 vc_resize(vc, cols, rows);
2955         }
2956
2957         if (fg != -1)
2958                 fbcon_modechanged(info);
2959 }
2960
2961 static int fbcon_mode_deleted(struct fb_info *info,
2962                               struct fb_videomode *mode)
2963 {
2964         struct fb_info *fb_info;
2965         struct display *p;
2966         int i, j, found = 0;
2967
2968         /* before deletion, ensure that mode is not in use */
2969         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2970                 j = con2fb_map[i];
2971                 if (j == -1)
2972                         continue;
2973                 fb_info = registered_fb[j];
2974                 if (fb_info != info)
2975                         continue;
2976                 p = &fb_display[i];
2977                 if (!p || !p->mode)
2978                         continue;
2979                 if (fb_mode_is_equal(p->mode, mode)) {
2980                         found = 1;
2981                         break;
2982                 }
2983         }
2984         return found;
2985 }
2986
2987 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2988 static int fbcon_unbind(void)
2989 {
2990         int ret;
2991
2992         ret = do_unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
2993                                 fbcon_is_default);
2994
2995         if (!ret)
2996                 fbcon_has_console_bind = 0;
2997
2998         return ret;
2999 }
3000 #else
3001 static inline int fbcon_unbind(void)
3002 {
3003         return -EINVAL;
3004 }
3005 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3006
3007 /* called with console_lock held */
3008 static int fbcon_fb_unbind(int idx)
3009 {
3010         int i, new_idx = -1, ret = 0;
3011
3012         if (!fbcon_has_console_bind)
3013                 return 0;
3014
3015         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3016                 if (con2fb_map[i] != idx &&
3017                     con2fb_map[i] != -1) {
3018                         new_idx = i;
3019                         break;
3020                 }
3021         }
3022
3023         if (new_idx != -1) {
3024                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3025                         if (con2fb_map[i] == idx)
3026                                 set_con2fb_map(i, new_idx, 0);
3027                 }
3028         } else {
3029                 struct fb_info *info = registered_fb[idx];
3030
3031                 /* This is sort of like set_con2fb_map, except it maps
3032                  * the consoles to no device and then releases the
3033                  * oldinfo to free memory and cancel the cursor blink
3034                  * timer. I can imagine this just becoming part of
3035                  * set_con2fb_map where new_idx is -1
3036                  */
3037                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3038                         if (con2fb_map[i] == idx) {
3039                                 con2fb_map[i] = -1;
3040                                 if (!search_fb_in_map(idx)) {
3041                                         ret = con2fb_release_oldinfo(vc_cons[i].d,
3042                                                                      info, NULL, i,
3043                                                                      idx, 0);
3044                                         if (ret) {
3045                                                 con2fb_map[i] = idx;
3046                                                 return ret;
3047                                         }
3048                                 }
3049                         }
3050                 }
3051                 ret = fbcon_unbind();
3052         }
3053
3054         return ret;
3055 }
3056
3057 /* called with console_lock held */
3058 static int fbcon_fb_unregistered(struct fb_info *info)
3059 {
3060         int i, idx;
3061
3062         idx = info->node;
3063         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3064                 if (con2fb_map[i] == idx)
3065                         con2fb_map[i] = -1;
3066         }
3067
3068         if (idx == info_idx) {
3069                 info_idx = -1;
3070
3071                 for (i = 0; i < FB_MAX; i++) {
3072                         if (registered_fb[i] != NULL) {
3073                                 info_idx = i;
3074                                 break;
3075                         }
3076                 }
3077         }
3078
3079         if (info_idx != -1) {
3080                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3081                         if (con2fb_map[i] == -1)
3082                                 con2fb_map[i] = info_idx;
3083                 }
3084         }
3085
3086         if (primary_device == idx)
3087                 primary_device = -1;
3088
3089         if (!num_registered_fb)
3090                 do_unregister_con_driver(&fb_con);
3091
3092         return 0;
3093 }
3094
3095 /* called with console_lock held */
3096 static void fbcon_remap_all(int idx)
3097 {
3098         int i;
3099         for (i = first_fb_vc; i <= last_fb_vc; i++)
3100                 set_con2fb_map(i, idx, 0);
3101
3102         if (con_is_bound(&fb_con)) {
3103                 printk(KERN_INFO "fbcon: Remapping primary device, "
3104                        "fb%i, to tty %i-%i\n", idx,
3105                        first_fb_vc + 1, last_fb_vc + 1);
3106                 info_idx = idx;
3107         }
3108 }
3109
3110 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
3111 static void fbcon_select_primary(struct fb_info *info)
3112 {
3113         if (!map_override && primary_device == -1 &&
3114             fb_is_primary_device(info)) {
3115                 int i;
3116
3117                 printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
3118                        info->fix.id, info->node);
3119                 primary_device = info->node;
3120
3121                 for (i = first_fb_vc; i <= last_fb_vc; i++)
3122                         con2fb_map_boot[i] = primary_device;
3123
3124                 if (con_is_bound(&fb_con)) {
3125                         printk(KERN_INFO "fbcon: Remapping primary device, "
3126                                "fb%i, to tty %i-%i\n", info->node,
3127                                first_fb_vc + 1, last_fb_vc + 1);
3128                         info_idx = primary_device;
3129                 }
3130         }
3131
3132 }
3133 #else
3134 static inline void fbcon_select_primary(struct fb_info *info)
3135 {
3136         return;
3137 }
3138 #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
3139
3140 /* called with console_lock held */
3141 static int fbcon_fb_registered(struct fb_info *info)
3142 {
3143         int ret = 0, i, idx;
3144
3145         idx = info->node;
3146         fbcon_select_primary(info);
3147
3148         if (info_idx == -1) {
3149                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3150                         if (con2fb_map_boot[i] == idx) {
3151                                 info_idx = idx;
3152                                 break;
3153                         }
3154                 }
3155
3156                 if (info_idx != -1)
3157                         ret = do_fbcon_takeover(1);
3158         } else {
3159                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3160                         if (con2fb_map_boot[i] == idx)
3161                                 set_con2fb_map(i, idx, 0);
3162                 }
3163         }
3164
3165         return ret;
3166 }
3167
3168 static void fbcon_fb_blanked(struct fb_info *info, int blank)
3169 {
3170         struct fbcon_ops *ops = info->fbcon_par;
3171         struct vc_data *vc;
3172
3173         if (!ops || ops->currcon < 0)
3174                 return;
3175
3176         vc = vc_cons[ops->currcon].d;
3177         if (vc->vc_mode != KD_TEXT ||
3178                         registered_fb[con2fb_map[ops->currcon]] != info)
3179                 return;
3180
3181         if (con_is_visible(vc)) {
3182                 if (blank)
3183                         do_blank_screen(0);
3184                 else
3185                         do_unblank_screen(0);
3186         }
3187         ops->blank_state = blank;
3188 }
3189
3190 static void fbcon_new_modelist(struct fb_info *info)
3191 {
3192         int i;
3193         struct vc_data *vc;
3194         struct fb_var_screeninfo var;
3195         const struct fb_videomode *mode;
3196
3197         for (i = first_fb_vc; i <= last_fb_vc; i++) {
3198                 if (registered_fb[con2fb_map[i]] != info)
3199                         continue;
3200                 if (!fb_display[i].mode)
3201                         continue;
3202                 vc = vc_cons[i].d;
3203                 display_to_var(&var, &fb_display[i]);
3204                 mode = fb_find_nearest_mode(fb_display[i].mode,
3205                                             &info->modelist);
3206                 fb_videomode_to_var(&var, mode);
3207                 fbcon_set_disp(info, &var, vc->vc_num);
3208         }
3209 }
3210
3211 static void fbcon_get_requirement(struct fb_info *info,
3212                                   struct fb_blit_caps *caps)
3213 {
3214         struct vc_data *vc;
3215         struct display *p;
3216
3217         if (caps->flags) {
3218                 int i, charcnt;
3219
3220                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
3221                         vc = vc_cons[i].d;
3222                         if (vc && vc->vc_mode == KD_TEXT &&
3223                             info->node == con2fb_map[i]) {
3224                                 p = &fb_display[i];
3225                                 caps->x |= 1 << (vc->vc_font.width - 1);
3226                                 caps->y |= 1 << (vc->vc_font.height - 1);
3227                                 charcnt = (p->userfont) ?
3228                                         FNTCHARCNT(p->fontdata) : 256;
3229                                 if (caps->len < charcnt)
3230                                         caps->len = charcnt;
3231                         }
3232                 }
3233         } else {
3234                 vc = vc_cons[fg_console].d;
3235
3236                 if (vc && vc->vc_mode == KD_TEXT &&
3237                     info->node == con2fb_map[fg_console]) {
3238                         p = &fb_display[fg_console];
3239                         caps->x = 1 << (vc->vc_font.width - 1);
3240                         caps->y = 1 << (vc->vc_font.height - 1);
3241                         caps->len = (p->userfont) ?
3242                                 FNTCHARCNT(p->fontdata) : 256;
3243                 }
3244         }
3245 }
3246
3247 static int fbcon_event_notify(struct notifier_block *self,
3248                               unsigned long action, void *data)
3249 {
3250         struct fb_event *event = data;
3251         struct fb_info *info = event->info;
3252         struct fb_videomode *mode;
3253         struct fb_con2fbmap *con2fb;
3254         struct fb_blit_caps *caps;
3255         int idx, ret = 0;
3256
3257         /*
3258          * ignore all events except driver registration and deregistration
3259          * if fbcon is not active
3260          */
3261         if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
3262                                   action == FB_EVENT_FB_UNREGISTERED))
3263                 goto done;
3264
3265         switch(action) {
3266         case FB_EVENT_SUSPEND:
3267                 fbcon_suspended(info);
3268                 break;
3269         case FB_EVENT_RESUME:
3270                 fbcon_resumed(info);
3271                 break;
3272         case FB_EVENT_MODE_CHANGE:
3273                 fbcon_modechanged(info);
3274                 break;
3275         case FB_EVENT_MODE_CHANGE_ALL:
3276                 fbcon_set_all_vcs(info);
3277                 break;
3278         case FB_EVENT_MODE_DELETE:
3279                 mode = event->data;
3280                 ret = fbcon_mode_deleted(info, mode);
3281                 break;
3282         case FB_EVENT_FB_UNBIND:
3283                 idx = info->node;
3284                 ret = fbcon_fb_unbind(idx);
3285                 break;
3286         case FB_EVENT_FB_REGISTERED:
3287                 ret = fbcon_fb_registered(info);
3288                 break;
3289         case FB_EVENT_FB_UNREGISTERED:
3290                 ret = fbcon_fb_unregistered(info);
3291                 break;
3292         case FB_EVENT_SET_CONSOLE_MAP:
3293                 /* called with console lock held */
3294                 con2fb = event->data;
3295                 ret = set_con2fb_map(con2fb->console - 1,
3296                                      con2fb->framebuffer, 1);
3297                 break;
3298         case FB_EVENT_GET_CONSOLE_MAP:
3299                 con2fb = event->data;
3300                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
3301                 break;
3302         case FB_EVENT_BLANK:
3303                 fbcon_fb_blanked(info, *(int *)event->data);
3304                 break;
3305         case FB_EVENT_NEW_MODELIST:
3306                 fbcon_new_modelist(info);
3307                 break;
3308         case FB_EVENT_GET_REQ:
3309                 caps = event->data;
3310                 fbcon_get_requirement(info, caps);
3311                 break;
3312         case FB_EVENT_REMAP_ALL_CONSOLE:
3313                 idx = info->node;
3314                 fbcon_remap_all(idx);
3315                 break;
3316         }
3317 done:
3318         return ret;
3319 }
3320
3321 /*
3322  *  The console `switch' structure for the frame buffer based console
3323  */
3324
3325 static const struct consw fb_con = {
3326         .owner                  = THIS_MODULE,
3327         .con_startup            = fbcon_startup,
3328         .con_init               = fbcon_init,
3329         .con_deinit             = fbcon_deinit,
3330         .con_clear              = fbcon_clear,
3331         .con_putc               = fbcon_putc,
3332         .con_putcs              = fbcon_putcs,
3333         .con_cursor             = fbcon_cursor,
3334         .con_scroll             = fbcon_scroll,
3335         .con_switch             = fbcon_switch,
3336         .con_blank              = fbcon_blank,
3337         .con_font_set           = fbcon_set_font,
3338         .con_font_get           = fbcon_get_font,
3339         .con_font_default       = fbcon_set_def_font,
3340         .con_font_copy          = fbcon_copy_font,
3341         .con_set_palette        = fbcon_set_palette,
3342         .con_scrolldelta        = fbcon_scrolldelta,
3343         .con_set_origin         = fbcon_set_origin,
3344         .con_invert_region      = fbcon_invert_region,
3345         .con_screen_pos         = fbcon_screen_pos,
3346         .con_getxy              = fbcon_getxy,
3347         .con_resize             = fbcon_resize,
3348         .con_debug_enter        = fbcon_debug_enter,
3349         .con_debug_leave        = fbcon_debug_leave,
3350 };
3351
3352 static struct notifier_block fbcon_event_notifier = {
3353         .notifier_call  = fbcon_event_notify,
3354 };
3355
3356 static ssize_t store_rotate(struct device *device,
3357                             struct device_attribute *attr, const char *buf,
3358                             size_t count)
3359 {
3360         struct fb_info *info;
3361         int rotate, idx;
3362         char **last = NULL;
3363
3364         if (fbcon_has_exited)
3365                 return count;
3366
3367         console_lock();
3368         idx = con2fb_map[fg_console];
3369
3370         if (idx == -1 || registered_fb[idx] == NULL)
3371                 goto err;
3372
3373         info = registered_fb[idx];
3374         rotate = simple_strtoul(buf, last, 0);
3375         fbcon_rotate(info, rotate);
3376 err:
3377         console_unlock();
3378         return count;
3379 }
3380
3381 static ssize_t store_rotate_all(struct device *device,
3382                                 struct device_attribute *attr,const char *buf,
3383                                 size_t count)
3384 {
3385         struct fb_info *info;
3386         int rotate, idx;
3387         char **last = NULL;
3388
3389         if (fbcon_has_exited)
3390                 return count;
3391
3392         console_lock();
3393         idx = con2fb_map[fg_console];
3394
3395         if (idx == -1 || registered_fb[idx] == NULL)
3396                 goto err;
3397
3398         info = registered_fb[idx];
3399         rotate = simple_strtoul(buf, last, 0);
3400         fbcon_rotate_all(info, rotate);
3401 err:
3402         console_unlock();
3403         return count;
3404 }
3405
3406 static ssize_t show_rotate(struct device *device,
3407                            struct device_attribute *attr,char *buf)
3408 {
3409         struct fb_info *info;
3410         int rotate = 0, idx;
3411
3412         if (fbcon_has_exited)
3413                 return 0;
3414
3415         console_lock();
3416         idx = con2fb_map[fg_console];
3417
3418         if (idx == -1 || registered_fb[idx] == NULL)
3419                 goto err;
3420
3421         info = registered_fb[idx];
3422         rotate = fbcon_get_rotate(info);
3423 err:
3424         console_unlock();
3425         return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
3426 }
3427
3428 static ssize_t show_cursor_blink(struct device *device,
3429                                  struct device_attribute *attr, char *buf)
3430 {
3431         struct fb_info *info;
3432         struct fbcon_ops *ops;
3433         int idx, blink = -1;
3434
3435         if (fbcon_has_exited)
3436                 return 0;
3437
3438         console_lock();
3439         idx = con2fb_map[fg_console];
3440
3441         if (idx == -1 || registered_fb[idx] == NULL)
3442                 goto err;
3443
3444         info = registered_fb[idx];
3445         ops = info->fbcon_par;
3446
3447         if (!ops)
3448                 goto err;
3449
3450         blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0;
3451 err:
3452         console_unlock();
3453         return snprintf(buf, PAGE_SIZE, "%d\n", blink);
3454 }
3455
3456 static ssize_t store_cursor_blink(struct device *device,
3457                                   struct device_attribute *attr,
3458                                   const char *buf, size_t count)
3459 {
3460         struct fb_info *info;
3461         int blink, idx;
3462         char **last = NULL;
3463
3464         if (fbcon_has_exited)
3465                 return count;
3466
3467         console_lock();
3468         idx = con2fb_map[fg_console];
3469
3470         if (idx == -1 || registered_fb[idx] == NULL)
3471                 goto err;
3472
3473         info = registered_fb[idx];
3474
3475         if (!info->fbcon_par)
3476                 goto err;
3477
3478         blink = simple_strtoul(buf, last, 0);
3479
3480         if (blink) {
3481                 fbcon_cursor_noblink = 0;
3482                 fbcon_add_cursor_timer(info);
3483         } else {
3484                 fbcon_cursor_noblink = 1;
3485                 fbcon_del_cursor_timer(info);
3486         }
3487
3488 err:
3489         console_unlock();
3490         return count;
3491 }
3492
3493 static struct device_attribute device_attrs[] = {
3494         __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
3495         __ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
3496         __ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
3497                store_cursor_blink),
3498 };
3499
3500 static int fbcon_init_device(void)
3501 {
3502         int i, error = 0;
3503
3504         fbcon_has_sysfs = 1;
3505
3506         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3507                 error = device_create_file(fbcon_device, &device_attrs[i]);
3508
3509                 if (error)
3510                         break;
3511         }
3512
3513         if (error) {
3514                 while (--i >= 0)
3515                         device_remove_file(fbcon_device, &device_attrs[i]);
3516
3517                 fbcon_has_sysfs = 0;
3518         }
3519
3520         return 0;
3521 }
3522
3523 static void fbcon_start(void)
3524 {
3525         if (num_registered_fb) {
3526                 int i;
3527
3528                 console_lock();
3529
3530                 for (i = 0; i < FB_MAX; i++) {
3531                         if (registered_fb[i] != NULL) {
3532                                 info_idx = i;
3533                                 break;
3534                         }
3535                 }
3536
3537                 do_fbcon_takeover(0);
3538                 console_unlock();
3539
3540         }
3541 }
3542
3543 static void fbcon_exit(void)
3544 {
3545         struct fb_info *info;
3546         int i, j, mapped;
3547
3548         if (fbcon_has_exited)
3549                 return;
3550
3551         kfree((void *)softback_buf);
3552         softback_buf = 0UL;
3553
3554         for (i = 0; i < FB_MAX; i++) {
3555                 int pending = 0;
3556
3557                 mapped = 0;
3558                 info = registered_fb[i];
3559
3560                 if (info == NULL)
3561                         continue;
3562
3563                 if (info->queue.func)
3564                         pending = cancel_work_sync(&info->queue);
3565                 DPRINTK("fbcon: %s pending work\n", (pending ? "canceled" :
3566                         "no"));
3567
3568                 for (j = first_fb_vc; j <= last_fb_vc; j++) {
3569                         if (con2fb_map[j] == i) {
3570                                 mapped = 1;
3571                                 break;
3572                         }
3573                 }
3574
3575                 if (mapped) {
3576                         if (info->fbops->fb_release)
3577                                 info->fbops->fb_release(info, 0);
3578                         module_put(info->fbops->owner);
3579
3580                         if (info->fbcon_par) {
3581                                 struct fbcon_ops *ops = info->fbcon_par;
3582
3583                                 fbcon_del_cursor_timer(info);
3584                                 kfree(ops->cursor_src);
3585                                 kfree(ops->cursor_state.mask);
3586                                 kfree(info->fbcon_par);
3587                                 info->fbcon_par = NULL;
3588                         }
3589
3590                         if (info->queue.func == fb_flashcursor)
3591                                 info->queue.func = NULL;
3592                 }
3593         }
3594
3595         fbcon_has_exited = 1;
3596 }
3597
3598 static int __init fb_console_init(void)
3599 {
3600         int i;
3601
3602         console_lock();
3603         fb_register_client(&fbcon_event_notifier);
3604         fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), NULL,
3605                                      "fbcon");
3606
3607         if (IS_ERR(fbcon_device)) {
3608                 printk(KERN_WARNING "Unable to create device "
3609                        "for fbcon; errno = %ld\n",
3610                        PTR_ERR(fbcon_device));
3611                 fbcon_device = NULL;
3612         } else
3613                 fbcon_init_device();
3614
3615         for (i = 0; i < MAX_NR_CONSOLES; i++)
3616                 con2fb_map[i] = -1;
3617
3618         console_unlock();
3619         fbcon_start();
3620         return 0;
3621 }
3622
3623 fs_initcall(fb_console_init);
3624
3625 #ifdef MODULE
3626
3627 static void __exit fbcon_deinit_device(void)
3628 {
3629         int i;
3630
3631         if (fbcon_has_sysfs) {
3632                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3633                         device_remove_file(fbcon_device, &device_attrs[i]);
3634
3635                 fbcon_has_sysfs = 0;
3636         }
3637 }
3638
3639 static void __exit fb_console_exit(void)
3640 {
3641         console_lock();
3642         fb_unregister_client(&fbcon_event_notifier);
3643         fbcon_deinit_device();
3644         device_destroy(fb_class, MKDEV(0, 0));
3645         fbcon_exit();
3646         do_unregister_con_driver(&fb_con);
3647         console_unlock();
3648 }
3649
3650 module_exit(fb_console_exit);
3651
3652 #endif
3653
3654 MODULE_LICENSE("GPL");