drivers/video/console/fbcon.c

   1 /*
   2  *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1995 Geert Uytterhoeven
   5  *
   6  *
   7  *  This file is based on the original Amiga console driver (amicon.c):
   8  *
   9  *      Copyright (C) 1993 Hamish Macdonald
  10  *                         Greg Harp
  11  *      Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
  12  *
  13  *            with work by William Rucklidge (wjr@cs.cornell.edu)
  14  *                         Geert Uytterhoeven
  15  *                         Jes Sorensen (jds@kom.auc.dk)
  16  *                         Martin Apel
  17  *
  18  *  and on the original Atari console driver (atacon.c):
  19  *
  20  *      Copyright (C) 1993 Bjoern Brauel
  21  *                         Roman Hodek
  22  *
  23  *            with work by Guenther Kelleter
  24  *                         Martin Schaller
  25  *                         Andreas Schwab
  26  *
  27  *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
  28  *  Smart redraw scrolling, arbitrary font width support, 512char font support
  29  *  and software scrollback added by
  30  *                         Jakub Jelinek (jj@ultra.linux.cz)
  31  *
  32  *  Random hacking by Martin Mares <mj@ucw.cz>
  33  *
  34  *      2001 - Documented with DocBook
  35  *      - Brad Douglas <brad@neruo.com>
  36  *
  37  *  The low level operations for the various display memory organizations are
  38  *  now in separate source files.
  39  *
  40  *  Currently the following organizations are supported:
  41  *
  42  *    o afb                     Amiga bitplanes
  43  *    o cfb{2,4,8,16,24,32}     Packed pixels
  44  *    o ilbm                    Amiga interleaved bitplanes
  45  *    o iplan2p[248]            Atari interleaved bitplanes
  46  *    o mfb                     Monochrome
  47  *    o vga                     VGA characters/attributes
  48  *
  49  *  To do:
  50  *
  51  *    - Implement 16 plane mode (iplan2p16)
  52  *
  53  *
  54  *  This file is subject to the terms and conditions of the GNU General Public
  55  *  License.  See the file COPYING in the main directory of this archive for
  56  *  more details.
  57  */
  58
  59 #undef FBCONDEBUG
  60
  61 #include <linux/config.h>
  62 #include <linux/module.h>
  63 #include <linux/types.h>
  64 #include <linux/sched.h>
  65 #include <linux/fs.h>
  66 #include <linux/kernel.h>
  67 #include <linux/delay.h>        /* MSch: for IRQ probe */
  68 #include <linux/tty.h>
  69 #include <linux/console.h>
  70 #include <linux/string.h>
  71 #include <linux/kd.h>
  72 #include <linux/slab.h>
  73 #include <linux/fb.h>
  74 #include <linux/vt_kern.h>
  75 #include <linux/selection.h>
  76 #include <linux/font.h>
  77 #include <linux/smp.h>
  78 #include <linux/init.h>
  79 #include <linux/interrupt.h>
  80 #include <linux/crc32.h> /* For counting font checksums */
  81 #include <asm/irq.h>
  82 #include <asm/system.h>
  83 #include <asm/uaccess.h>
  84 #ifdef CONFIG_ATARI
  85 #include <asm/atariints.h>
  86 #endif
  87 #ifdef CONFIG_MAC
  88 #include <asm/macints.h>
  89 #endif
  90 #if defined(__mc68000__) || defined(CONFIG_APUS)
  91 #include <asm/machdep.h>
  92 #include <asm/setup.h>
  93 #endif
  94
  95 #include "fbcon.h"
  96
  97 #ifdef FBCONDEBUG
  98 #  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
  99 #else
 100 #  define DPRINTK(fmt, args...)
 101 #endif
 102
 103 enum {
 104         FBCON_LOGO_CANSHOW      = -1,   /* the logo can be shown */
 105         FBCON_LOGO_DRAW         = -2,   /* draw the logo to a console */
 106         FBCON_LOGO_DONTSHOW     = -3    /* do not show the logo */
 107 };
 108
 109 struct display fb_display[MAX_NR_CONSOLES];
 110 static signed char con2fb_map[MAX_NR_CONSOLES];
 111 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
 112 static int logo_height;
 113 static int logo_lines;
 114 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
 115    enums.  */
 116 static int logo_shown = FBCON_LOGO_CANSHOW;
 117 /* Software scrollback */
 118 static int fbcon_softback_size = 32768;
 119 static unsigned long softback_buf, softback_curr;
 120 static unsigned long softback_in;
 121 static unsigned long softback_top, softback_end;
 122 static int softback_lines;
 123 /* console mappings */
 124 static int first_fb_vc;
 125 static int last_fb_vc = MAX_NR_CONSOLES - 1;
 126 static int fbcon_is_default = 1;
 127 /* font data */
 128 static char fontname[40];
 129
 130 /* current fb_info */
 131 static int info_idx = -1;
 132
 133 static const struct consw fb_con;
 134
 135 #define CM_SOFTBACK     (8)
 136
 137 #define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
 138
 139 static void fbcon_free_font(struct display *);
 140 static int fbcon_set_origin(struct vc_data *);
 141
 142 #define CURSOR_DRAW_DELAY               (1)
 143
 144 /* # VBL ints between cursor state changes */
 145 #define ARM_CURSOR_BLINK_RATE           (10)
 146 #define ATARI_CURSOR_BLINK_RATE         (42)
 147 #define MAC_CURSOR_BLINK_RATE           (32)
 148 #define DEFAULT_CURSOR_BLINK_RATE       (20)
 149
 150 static int vbl_cursor_cnt;
 151
 152 #define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)
 153
 154 /*
 155  *  Interface used by the world
 156  */
 157
 158 static const char *fbcon_startup(void);
 159 static void fbcon_init(struct vc_data *vc, int init);
 160 static void fbcon_deinit(struct vc_data *vc);
 161 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
 162                         int width);
 163 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
 164 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
 165                         int count, int ypos, int xpos);
 166 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
 167 static void fbcon_cursor(struct vc_data *vc, int mode);
 168 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 169                         int count);
 170 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
 171                         int height, int width);
 172 static int fbcon_switch(struct vc_data *vc);
 173 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
 174 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
 175 static int fbcon_scrolldelta(struct vc_data *vc, int lines);
 176
 177 /*
 178  *  Internal routines
 179  */
 180 static __inline__ int real_y(struct display *p, int ypos);
 181 static __inline__ void ywrap_up(struct vc_data *vc, int count);
 182 static __inline__ void ywrap_down(struct vc_data *vc, int count);
 183 static __inline__ void ypan_up(struct vc_data *vc, int count);
 184 static __inline__ void ypan_down(struct vc_data *vc, int count);
 185 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
 186                             int dy, int dx, int height, int width, u_int y_break);
 187 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 188                            struct vc_data *vc);
 189 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
 190                               int unit);
 191 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 192                               int line, int count, int dy);
 193
 194 #ifdef CONFIG_MAC
 195 /*
 196  * On the Macintoy, there may or may not be a working VBL int. We need to probe
 197  */
 198 static int vbl_detected;
 199
 200 static irqreturn_t fb_vbl_detect(int irq, void *dummy, struct pt_regs *fp)
 201 {
 202         vbl_detected++;
 203         return IRQ_HANDLED;
 204 }
 205 #endif
 206
 207 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 208 {
 209         struct fbcon_ops *ops = info->fbcon_par;
 210
 211         return (info->state != FBINFO_STATE_RUNNING ||
 212                 vc->vc_mode != KD_TEXT || ops->graphics);
 213 }
 214
 215 static inline int get_color(struct vc_data *vc, struct fb_info *info,
 216               u16 c, int is_fg)
 217 {
 218         int depth = fb_get_color_depth(&info->var);
 219         int color = 0;
 220
 221         if (console_blanked) {
 222                 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 223
 224                 c = vc->vc_video_erase_char & charmask;
 225         }
 226
 227         if (depth != 1)
 228                 color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
 229                         : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);
 230
 231         switch (depth) {
 232         case 1:
 233         {
 234                 /* 0 or 1 */
 235                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? 1 : 0;
 236                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : 1;
 237
 238                 if (console_blanked)
 239                         fg = bg;
 240
 241                 color = (is_fg) ? fg : bg;
 242                 break;
 243         }
 244         case 2:
 245                 /*
 246                  * Scale down 16-colors to 4 colors. Default 4-color palette
 247                  * is grayscale.
 248                  */
 249                 color /= 4;
 250                 break;
 251         case 3:
 252                 /*
 253                  * Last 8 entries of default 16-color palette is a more intense
 254                  * version of the first 8 (i.e., same chrominance, different
 255                  * luminance).
 256                  */
 257                 color &= 7;
 258                 break;
 259         }
 260
 261
 262         return color;
 263 }
 264
 265 static void fb_flashcursor(void *private)
 266 {
 267         struct fb_info *info = private;
 268         struct fbcon_ops *ops = info->fbcon_par;
 269         struct display *p;
 270         struct vc_data *vc = NULL;
 271         int c;
 272         int mode;
 273
 274         if (ops->currcon != -1)
 275                 vc = vc_cons[ops->currcon].d;
 276
 277         if (!vc || !CON_IS_VISIBLE(vc) ||
 278             fbcon_is_inactive(vc, info) ||
 279             registered_fb[con2fb_map[vc->vc_num]] != info)
 280                 return;
 281         acquire_console_sem();
 282         p = &fb_display[vc->vc_num];
 283         c = scr_readw((u16 *) vc->vc_pos);
 284         mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
 285                 CM_ERASE : CM_DRAW;
 286         ops->cursor(vc, info, p, mode, softback_lines, get_color(vc, info, c, 1),
 287                     get_color(vc, info, c, 0));
 288         release_console_sem();
 289 }
 290
 291 #if (defined(__arm__) && defined(IRQ_VSYNCPULSE)) || defined(CONFIG_ATARI) || defined(CONFIG_MAC)
 292 static int cursor_blink_rate;
 293 static irqreturn_t fb_vbl_handler(int irq, void *dev_id, struct pt_regs *fp)
 294 {
 295         struct fb_info *info = dev_id;
 296
 297         if (vbl_cursor_cnt && --vbl_cursor_cnt == 0) {
 298                 schedule_work(&info->queue);
 299                 vbl_cursor_cnt = cursor_blink_rate;
 300         }
 301         return IRQ_HANDLED;
 302 }
 303 #endif
 304
 305 static void cursor_timer_handler(unsigned long dev_addr)
 306 {
 307         struct fb_info *info = (struct fb_info *) dev_addr;
 308         struct fbcon_ops *ops = info->fbcon_par;
 309
 310         schedule_work(&info->queue);
 311         mod_timer(&ops->cursor_timer, jiffies + HZ/5);
 312 }
 313
 314 #ifndef MODULE
 315 static int __init fb_console_setup(char *this_opt)
 316 {
 317         char *options;
 318         int i, j;
 319
 320         if (!this_opt || !*this_opt)
 321                 return 0;
 322
 323         while ((options = strsep(&this_opt, ",")) != NULL) {
 324                 if (!strncmp(options, "font:", 5))
 325                         strcpy(fontname, options + 5);
 326
 327                 if (!strncmp(options, "scrollback:", 11)) {
 328                         options += 11;
 329                         if (*options) {
 330                                 fbcon_softback_size = simple_strtoul(options, &options, 0);
 331                                 if (*options == 'k' || *options == 'K') {
 332                                         fbcon_softback_size *= 1024;
 333                                         options++;
 334                                 }
 335                                 if (*options != ',')
 336                                         return 0;
 337                                 options++;
 338                         } else
 339                                 return 0;
 340                 }
 341
 342                 if (!strncmp(options, "map:", 4)) {
 343                         options += 4;
 344                         if (*options)
 345                                 for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
 346                                         if (!options[j])
 347                                                 j = 0;
 348                                         con2fb_map_boot[i] =
 349                                                 (options[j++]-'0') % FB_MAX;
 350                                 }
 351                         return 0;
 352                 }
 353
 354                 if (!strncmp(options, "vc:", 3)) {
 355                         options += 3;
 356                         if (*options)
 357                                 first_fb_vc = simple_strtoul(options, &options, 10) - 1;
 358                         if (first_fb_vc < 0)
 359                                 first_fb_vc = 0;
 360                         if (*options++ == '-')
 361                                 last_fb_vc = simple_strtoul(options, &options, 10) - 1;
 362                         fbcon_is_default = 0;
 363                 }
 364         }
 365         return 0;
 366 }
 367
 368 __setup("fbcon=", fb_console_setup);
 369 #endif
 370
 371 static int search_fb_in_map(int idx)
 372 {
 373         int i, retval = 0;
 374
 375         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 376                 if (con2fb_map[i] == idx)
 377                         retval = 1;
 378         }
 379         return retval;
 380 }
 381
 382 static int search_for_mapped_con(void)
 383 {
 384         int i, retval = 0;
 385
 386         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 387                 if (con2fb_map[i] != -1)
 388                         retval = 1;
 389         }
 390         return retval;
 391 }
 392
 393 static int fbcon_takeover(int show_logo)
 394 {
 395         int err, i;
 396
 397         if (!num_registered_fb)
 398                 return -ENODEV;
 399
 400         if (!show_logo)
 401                 logo_shown = FBCON_LOGO_DONTSHOW;
 402
 403         for (i = first_fb_vc; i <= last_fb_vc; i++)
 404                 con2fb_map[i] = info_idx;
 405
 406         err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
 407                                 fbcon_is_default);
 408         if (err) {
 409                 for (i = first_fb_vc; i <= last_fb_vc; i++) {
 410                         con2fb_map[i] = -1;
 411                 }
 412                 info_idx = -1;
 413         }
 414
 415         return err;
 416 }
 417
 418 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 419                                int cols, int rows, int new_cols, int new_rows)
 420 {
 421         /* Need to make room for the logo */
 422         int cnt, erase = vc->vc_video_erase_char, step;
 423         unsigned short *save = NULL, *r, *q;
 424
 425         /*
 426          * remove underline attribute from erase character
 427          * if black and white framebuffer.
 428          */
 429         if (fb_get_color_depth(&info->var) == 1)
 430                 erase &= ~0x400;
 431         logo_height = fb_prepare_logo(info);
 432         logo_lines = (logo_height + vc->vc_font.height - 1) /
 433                 vc->vc_font.height;
 434         q = (unsigned short *) (vc->vc_origin +
 435                                 vc->vc_size_row * rows);
 436         step = logo_lines * cols;
 437         for (r = q - logo_lines * cols; r < q; r++)
 438                 if (scr_readw(r) != vc->vc_video_erase_char)
 439                         break;
 440         if (r != q && new_rows >= rows + logo_lines) {
 441                 save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
 442                 if (save) {
 443                         int i = cols < new_cols ? cols : new_cols;
 444                         scr_memsetw(save, erase, logo_lines * new_cols * 2);
 445                         r = q - step;
 446                         for (cnt = 0; cnt < logo_lines; cnt++, r += i)
 447                                 scr_memcpyw(save + cnt * new_cols, r, 2 * i);
 448                         r = q;
 449                 }
 450         }
 451         if (r == q) {
 452                 /* We can scroll screen down */
 453                 r = q - step - cols;
 454                 for (cnt = rows - logo_lines; cnt > 0; cnt--) {
 455                         scr_memcpyw(r + step, r, vc->vc_size_row);
 456                         r -= cols;
 457                 }
 458                 if (!save) {
 459                         vc->vc_y += logo_lines;
 460                         vc->vc_pos += logo_lines * vc->vc_size_row;
 461                 }
 462         }
 463         scr_memsetw((unsigned short *) vc->vc_origin,
 464                     erase,
 465                     vc->vc_size_row * logo_lines);
 466
 467         if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
 468                 fbcon_clear_margins(vc, 0);
 469                 update_screen(vc);
 470         }
 471
 472         if (save) {
 473                 q = (unsigned short *) (vc->vc_origin +
 474                                         vc->vc_size_row *
 475                                         rows);
 476                 scr_memcpyw(q, save, logo_lines * new_cols * 2);
 477                 vc->vc_y += logo_lines;
 478                 vc->vc_pos += logo_lines * vc->vc_size_row;
 479                 kfree(save);
 480         }
 481
 482         if (logo_lines > vc->vc_bottom) {
 483                 logo_shown = FBCON_LOGO_CANSHOW;
 484                 printk(KERN_INFO
 485                        "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
 486         } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
 487                 logo_shown = FBCON_LOGO_DRAW;
 488                 vc->vc_top = logo_lines;
 489         }
 490 }
 491
 492 #ifdef CONFIG_FB_TILEBLITTING
 493 static void set_blitting_type(struct vc_data *vc, struct fb_info *info,
 494                               struct display *p)
 495 {
 496         struct fbcon_ops *ops = info->fbcon_par;
 497
 498         if ((info->flags & FBINFO_MISC_TILEBLITTING))
 499                 fbcon_set_tileops(vc, info, p, ops);
 500         else
 501                 fbcon_set_bitops(ops);
 502 }
 503 #else
 504 static void set_blitting_type(struct vc_data *vc, struct fb_info *info,
 505                               struct display *p)
 506 {
 507         struct fbcon_ops *ops = info->fbcon_par;
 508
 509         info->flags &= ~FBINFO_MISC_TILEBLITTING;
 510         fbcon_set_bitops(ops);
 511 }
 512 #endif /* CONFIG_MISC_TILEBLITTING */
 513
 514
 515 static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
 516                                   int unit, int oldidx)
 517 {
 518         struct fbcon_ops *ops = NULL;
 519         int err = 0;
 520
 521         if (!try_module_get(info->fbops->owner))
 522                 err = -ENODEV;
 523
 524         if (!err && info->fbops->fb_open &&
 525             info->fbops->fb_open(info, 0))
 526                 err = -ENODEV;
 527
 528         if (!err) {
 529                 ops = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 530                 if (!ops)
 531                         err = -ENOMEM;
 532         }
 533
 534         if (!err) {
 535                 memset(ops, 0, sizeof(struct fbcon_ops));
 536                 info->fbcon_par = ops;
 537                 set_blitting_type(vc, info, NULL);
 538         }
 539
 540         if (err) {
 541                 con2fb_map[unit] = oldidx;
 542                 module_put(info->fbops->owner);
 543         }
 544
 545         return err;
 546 }
 547
 548 static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
 549                                   struct fb_info *newinfo, int unit,
 550                                   int oldidx, int found)
 551 {
 552         struct fbcon_ops *ops = oldinfo->fbcon_par;
 553         int err = 0;
 554
 555         if (oldinfo->fbops->fb_release &&
 556             oldinfo->fbops->fb_release(oldinfo, 0)) {
 557                 con2fb_map[unit] = oldidx;
 558                 if (!found && newinfo->fbops->fb_release)
 559                         newinfo->fbops->fb_release(newinfo, 0);
 560                 if (!found)
 561                         module_put(newinfo->fbops->owner);
 562                 err = -ENODEV;
 563         }
 564
 565         if (!err) {
 566                 if (oldinfo->queue.func == fb_flashcursor)
 567                         del_timer_sync(&ops->cursor_timer);
 568
 569                 kfree(ops->cursor_state.mask);
 570                 kfree(ops->cursor_data);
 571                 kfree(oldinfo->fbcon_par);
 572                 oldinfo->fbcon_par = NULL;
 573                 module_put(oldinfo->fbops->owner);
 574         }
 575
 576         return err;
 577 }
 578
 579 static void con2fb_init_newinfo(struct fb_info *info)
 580 {
 581         if (!info->queue.func || info->queue.func == fb_flashcursor) {
 582                 struct fbcon_ops *ops = info->fbcon_par;
 583
 584                 if (!info->queue.func)
 585                         INIT_WORK(&info->queue, fb_flashcursor, info);
 586
 587                 init_timer(&ops->cursor_timer);
 588                 ops->cursor_timer.function = cursor_timer_handler;
 589                 ops->cursor_timer.expires = jiffies + HZ / 5;
 590                 ops->cursor_timer.data = (unsigned long ) info;
 591                 add_timer(&ops->cursor_timer);
 592         }
 593 }
 594
 595 static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
 596                                 int unit, int show_logo)
 597 {
 598         struct fbcon_ops *ops = info->fbcon_par;
 599
 600         ops->currcon = fg_console;
 601
 602         if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT))
 603                 info->fbops->fb_set_par(info);
 604
 605         ops->flags |= FBCON_FLAGS_INIT;
 606         ops->graphics = 0;
 607
 608         if (vc)
 609                 fbcon_set_disp(info, &info->var, vc);
 610         else
 611                 fbcon_preset_disp(info, &info->var, unit);
 612
 613         if (show_logo) {
 614                 struct vc_data *fg_vc = vc_cons[fg_console].d;
 615                 struct fb_info *fg_info =
 616                         registered_fb[con2fb_map[fg_console]];
 617
 618                 fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
 619                                    fg_vc->vc_rows, fg_vc->vc_cols,
 620                                    fg_vc->vc_rows);
 621         }
 622
 623         update_screen(vc_cons[fg_console].d);
 624 }
 625
 626 /**
 627  *      set_con2fb_map - map console to frame buffer device
 628  *      @unit: virtual console number to map
 629  *      @newidx: frame buffer index to map virtual console to
 630  *      @user: user request
 631  *
 632  *      Maps a virtual console @unit to a frame buffer device
 633  *      @newidx.
 634  */
 635 static int set_con2fb_map(int unit, int newidx, int user)
 636 {
 637         struct vc_data *vc = vc_cons[unit].d;
 638         int oldidx = con2fb_map[unit];
 639         struct fb_info *info = registered_fb[newidx];
 640         struct fb_info *oldinfo = NULL;
 641         int found, err = 0;
 642
 643         if (oldidx == newidx)
 644                 return 0;
 645
 646         if (!info)
 647                 err =  -EINVAL;
 648
 649         if (!err && !search_for_mapped_con()) {
 650                 info_idx = newidx;
 651                 return fbcon_takeover(0);
 652         }
 653
 654         if (oldidx != -1)
 655                 oldinfo = registered_fb[oldidx];
 656
 657         found = search_fb_in_map(newidx);
 658
 659         acquire_console_sem();
 660         con2fb_map[unit] = newidx;
 661         if (!err && !found)
 662                 err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
 663
 664
 665         /*
 666          * If old fb is not mapped to any of the consoles,
 667          * fbcon should release it.
 668          */
 669         if (!err && oldinfo && !search_fb_in_map(oldidx))
 670                 err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
 671                                              found);
 672
 673         if (!err) {
 674                 int show_logo = (fg_console == 0 && !user &&
 675                                  logo_shown != FBCON_LOGO_DONTSHOW);
 676
 677                 if (!found)
 678                         con2fb_init_newinfo(info);
 679                 con2fb_map_boot[unit] = newidx;
 680                 con2fb_init_display(vc, info, unit, show_logo);
 681         }
 682
 683         release_console_sem();
 684         return err;
 685 }
 686
 687 /*
 688  *  Low Level Operations
 689  */
 690 /* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
 691 static int var_to_display(struct display *disp,
 692                           struct fb_var_screeninfo *var,
 693                           struct fb_info *info)
 694 {
 695         disp->xres_virtual = var->xres_virtual;
 696         disp->yres_virtual = var->yres_virtual;
 697         disp->bits_per_pixel = var->bits_per_pixel;
 698         disp->grayscale = var->grayscale;
 699         disp->nonstd = var->nonstd;
 700         disp->accel_flags = var->accel_flags;
 701         disp->height = var->height;
 702         disp->width = var->width;
 703         disp->red = var->red;
 704         disp->green = var->green;
 705         disp->blue = var->blue;
 706         disp->transp = var->transp;
 707         disp->rotate = var->rotate;
 708         disp->mode = fb_match_mode(var, &info->modelist);
 709         if (disp->mode == NULL)
 710                 /* This should not happen */
 711                 return -EINVAL;
 712         return 0;
 713 }
 714
 715 static void display_to_var(struct fb_var_screeninfo *var,
 716                            struct display *disp)
 717 {
 718         fb_videomode_to_var(var, disp->mode);
 719         var->xres_virtual = disp->xres_virtual;
 720         var->yres_virtual = disp->yres_virtual;
 721         var->bits_per_pixel = disp->bits_per_pixel;
 722         var->grayscale = disp->grayscale;
 723         var->nonstd = disp->nonstd;
 724         var->accel_flags = disp->accel_flags;
 725         var->height = disp->height;
 726         var->width = disp->width;
 727         var->red = disp->red;
 728         var->green = disp->green;
 729         var->blue = disp->blue;
 730         var->transp = disp->transp;
 731         var->rotate = disp->rotate;
 732 }
 733
 734 static const char *fbcon_startup(void)
 735 {
 736         const char *display_desc = "frame buffer device";
 737         struct display *p = &fb_display[fg_console];
 738         struct vc_data *vc = vc_cons[fg_console].d;
 739         struct font_desc *font = NULL;
 740         struct module *owner;
 741         struct fb_info *info = NULL;
 742         struct fbcon_ops *ops;
 743         int rows, cols;
 744         int irqres;
 745
 746         irqres = 1;
 747         /*
 748          *  If num_registered_fb is zero, this is a call for the dummy part.
 749          *  The frame buffer devices weren't initialized yet.
 750          */
 751         if (!num_registered_fb || info_idx == -1)
 752                 return display_desc;
 753         /*
 754          * Instead of blindly using registered_fb[0], we use info_idx, set by
 755          * fb_console_init();
 756          */
 757         info = registered_fb[info_idx];
 758         if (!info)
 759                 return NULL;
 760
 761         owner = info->fbops->owner;
 762         if (!try_module_get(owner))
 763                 return NULL;
 764         if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
 765                 module_put(owner);
 766                 return NULL;
 767         }
 768
 769         ops = kmalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
 770         if (!ops) {
 771                 module_put(owner);
 772                 return NULL;
 773         }
 774
 775         memset(ops, 0, sizeof(struct fbcon_ops));
 776         ops->currcon = -1;
 777         ops->graphics = 1;
 778         info->fbcon_par = ops;
 779         set_blitting_type(vc, info, NULL);
 780
 781         if (info->fix.type != FB_TYPE_TEXT) {
 782                 if (fbcon_softback_size) {
 783                         if (!softback_buf) {
 784                                 softback_buf =
 785                                     (unsigned long)
 786                                     kmalloc(fbcon_softback_size,
 787                                             GFP_KERNEL);
 788                                 if (!softback_buf) {
 789                                         fbcon_softback_size = 0;
 790                                         softback_top = 0;
 791                                 }
 792                         }
 793                 } else {
 794                         if (softback_buf) {
 795                                 kfree((void *) softback_buf);
 796                                 softback_buf = 0;
 797                                 softback_top = 0;
 798                         }
 799                 }
 800                 if (softback_buf)
 801                         softback_in = softback_top = softback_curr =
 802                             softback_buf;
 803                 softback_lines = 0;
 804         }
 805
 806         /* Setup default font */
 807         if (!p->fontdata) {
 808                 if (!fontname[0] || !(font = find_font(fontname)))
 809                         font = get_default_font(info->var.xres,
 810                                                 info->var.yres);
 811                 vc->vc_font.width = font->width;
 812                 vc->vc_font.height = font->height;
 813                 vc->vc_font.data = p->fontdata = font->data;
 814                 vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
 815         }
 816
 817         cols = info->var.xres / vc->vc_font.width;
 818         rows = info->var.yres / vc->vc_font.height;
 819         vc_resize(vc, cols, rows);
 820
 821         DPRINTK("mode:   %s\n", info->fix.id);
 822         DPRINTK("visual: %d\n", info->fix.visual);
 823         DPRINTK("res:    %dx%d-%d\n", info->var.xres,
 824                 info->var.yres,
 825                 info->var.bits_per_pixel);
 826
 827 #ifdef CONFIG_ATARI
 828         if (MACH_IS_ATARI) {
 829                 cursor_blink_rate = ATARI_CURSOR_BLINK_RATE;
 830                 irqres =
 831                     request_irq(IRQ_AUTO_4, fb_vbl_handler,
 832                                 IRQ_TYPE_PRIO, "framebuffer vbl",
 833                                 info);
 834         }
 835 #endif                          /* CONFIG_ATARI */
 836
 837 #ifdef CONFIG_MAC
 838         /*
 839          * On a Macintoy, the VBL interrupt may or may not be active.
 840          * As interrupt based cursor is more reliable and race free, we
 841          * probe for VBL interrupts.
 842          */
 843         if (MACH_IS_MAC) {
 844                 int ct = 0;
 845                 /*
 846                  * Probe for VBL: set temp. handler ...
 847                  */
 848                 irqres = request_irq(IRQ_MAC_VBL, fb_vbl_detect, 0,
 849                                      "framebuffer vbl", info);
 850                 vbl_detected = 0;
 851
 852                 /*
 853                  * ... and spin for 20 ms ...
 854                  */
 855                 while (!vbl_detected && ++ct < 1000)
 856                         udelay(20);
 857
 858                 if (ct == 1000)
 859                         printk
 860                             ("fbcon_startup: No VBL detected, using timer based cursor.\n");
 861
 862                 free_irq(IRQ_MAC_VBL, fb_vbl_detect);
 863
 864                 if (vbl_detected) {
 865                         /*
 866                          * interrupt based cursor ok
 867                          */
 868                         cursor_blink_rate = MAC_CURSOR_BLINK_RATE;
 869                         irqres =
 870                             request_irq(IRQ_MAC_VBL, fb_vbl_handler, 0,
 871                                         "framebuffer vbl", info);
 872                 } else {
 873                         /*
 874                          * VBL not detected: fall through, use timer based cursor
 875                          */
 876                         irqres = 1;
 877                 }
 878         }
 879 #endif                          /* CONFIG_MAC */
 880
 881 #if defined(__arm__) && defined(IRQ_VSYNCPULSE)
 882         cursor_blink_rate = ARM_CURSOR_BLINK_RATE;
 883         irqres = request_irq(IRQ_VSYNCPULSE, fb_vbl_handler, SA_SHIRQ,
 884                              "framebuffer vbl", info);
 885 #endif
 886         /* Initialize the work queue. If the driver provides its
 887          * own work queue this means it will use something besides
 888          * default timer to flash the cursor. */
 889         if (!info->queue.func) {
 890                 INIT_WORK(&info->queue, fb_flashcursor, info);
 891
 892                 init_timer(&ops->cursor_timer);
 893                 ops->cursor_timer.function = cursor_timer_handler;
 894                 ops->cursor_timer.expires = jiffies + HZ / 5;
 895                 ops->cursor_timer.data = (unsigned long ) info;
 896                 add_timer(&ops->cursor_timer);
 897         }
 898         return display_desc;
 899 }
 900
 901 static void fbcon_init(struct vc_data *vc, int init)
 902 {
 903         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
 904         struct fbcon_ops *ops;
 905         struct vc_data **default_mode = vc->vc_display_fg;
 906         struct vc_data *svc = *default_mode;
 907         struct display *t, *p = &fb_display[vc->vc_num];
 908         int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
 909         int cap = info->flags;
 910
 911         if (info_idx == -1 || info == NULL)
 912             return;
 913         if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
 914             (info->fix.type == FB_TYPE_TEXT))
 915                 logo = 0;
 916
 917         info->var.xoffset = info->var.yoffset = p->yscroll = 0; /* reset wrap/pan */
 918
 919         if (var_to_display(p, &info->var, info))
 920                 return;
 921
 922         /* If we are not the first console on this
 923            fb, copy the font from that console */
 924         t = &fb_display[svc->vc_num];
 925         if (!vc->vc_font.data) {
 926                 vc->vc_font.data = p->fontdata = t->fontdata;
 927                 vc->vc_font.width = (*default_mode)->vc_font.width;
 928                 vc->vc_font.height = (*default_mode)->vc_font.height;
 929                 p->userfont = t->userfont;
 930                 if (p->userfont)
 931                         REFCOUNT(p->fontdata)++;
 932         }
 933         if (p->userfont)
 934                 charcnt = FNTCHARCNT(p->fontdata);
 935         vc->vc_can_do_color = (fb_get_color_depth(&info->var) != 1);
 936         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 937         if (charcnt == 256) {
 938                 vc->vc_hi_font_mask = 0;
 939         } else {
 940                 vc->vc_hi_font_mask = 0x100;
 941                 if (vc->vc_can_do_color)
 942                         vc->vc_complement_mask <<= 1;
 943         }
 944
 945         if (!*svc->vc_uni_pagedir_loc)
 946                 con_set_default_unimap(svc);
 947         if (!*vc->vc_uni_pagedir_loc)
 948                 con_copy_unimap(vc, svc);
 949
 950         cols = vc->vc_cols;
 951         rows = vc->vc_rows;
 952         new_cols = info->var.xres / vc->vc_font.width;
 953         new_rows = info->var.yres / vc->vc_font.height;
 954         vc_resize(vc, new_cols, new_rows);
 955
 956         ops = info->fbcon_par;
 957         /*
 958          * We must always set the mode. The mode of the previous console
 959          * driver could be in the same resolution but we are using different
 960          * hardware so we have to initialize the hardware.
 961          *
 962          * We need to do it in fbcon_init() to prevent screen corruption.
 963          */
 964         if (CON_IS_VISIBLE(vc)) {
 965                 if (info->fbops->fb_set_par &&
 966                     !(ops->flags & FBCON_FLAGS_INIT))
 967                         info->fbops->fb_set_par(info);
 968                 ops->flags |= FBCON_FLAGS_INIT;
 969         }
 970
 971         ops->graphics = 0;
 972
 973         if ((cap & FBINFO_HWACCEL_COPYAREA) &&
 974             !(cap & FBINFO_HWACCEL_DISABLED))
 975                 p->scrollmode = SCROLL_MOVE;
 976         else /* default to something safe */
 977                 p->scrollmode = SCROLL_REDRAW;
 978
 979         /*
 980          *  ++guenther: console.c:vc_allocate() relies on initializing
 981          *  vc_{cols,rows}, but we must not set those if we are only
 982          *  resizing the console.
 983          */
 984         if (!init) {
 985                 vc->vc_cols = new_cols;
 986                 vc->vc_rows = new_rows;
 987         }
 988
 989         if (logo)
 990                 fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
 991
 992         if (vc == svc && softback_buf) {
 993                 int l = fbcon_softback_size / vc->vc_size_row;
 994                 if (l > 5)
 995                         softback_end = softback_buf + l * vc->vc_size_row;
 996                 else {
 997                         /* Smaller scrollback makes no sense, and 0 would screw
 998                            the operation totally */
 999                         softback_top = 0;
1000                 }
1001         }
1002 }
1003
1004 static void fbcon_deinit(struct vc_data *vc)
1005 {
1006         struct display *p = &fb_display[vc->vc_num];
1007
1008         if (info_idx != -1)
1009             return;
1010         fbcon_free_font(p);
1011 }
1012
1013 /* ====================================================================== */
1014
1015 /*  fbcon_XXX routines - interface used by the world
1016  *
1017  *  This system is now divided into two levels because of complications
1018  *  caused by hardware scrolling. Top level functions:
1019  *
1020  *      fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
1021  *
1022  *  handles y values in range [0, scr_height-1] that correspond to real
1023  *  screen positions. y_wrap shift means that first line of bitmap may be
1024  *  anywhere on this display. These functions convert lineoffsets to
1025  *  bitmap offsets and deal with the wrap-around case by splitting blits.
1026  *
1027  *      fbcon_bmove_physical_8()    -- These functions fast implementations
1028  *      fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
1029  *      fbcon_putc_physical_8()     -- (font width != 8) may be added later
1030  *
1031  *  WARNING:
1032  *
1033  *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
1034  *  Implies should only really hardware scroll in rows. Only reason for
1035  *  restriction is simplicity & efficiency at the moment.
1036  */
1037
1038 static __inline__ int real_y(struct display *p, int ypos)
1039 {
1040         int rows = p->vrows;
1041
1042         ypos += p->yscroll;
1043         return ypos < rows ? ypos : ypos - rows;
1044 }
1045
1046
1047 static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
1048                         int width)
1049 {
1050         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1051         struct fbcon_ops *ops = info->fbcon_par;
1052
1053         struct display *p = &fb_display[vc->vc_num];
1054         u_int y_break;
1055
1056         if (fbcon_is_inactive(vc, info))
1057                 return;
1058
1059         if (!height || !width)
1060                 return;
1061
1062         /* Split blits that cross physical y_wrap boundary */
1063
1064         y_break = p->vrows - p->yscroll;
1065         if (sy < y_break && sy + height - 1 >= y_break) {
1066                 u_int b = y_break - sy;
1067                 ops->clear(vc, info, real_y(p, sy), sx, b, width);
1068                 ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
1069                                  width);
1070         } else
1071                 ops->clear(vc, info, real_y(p, sy), sx, height, width);
1072 }
1073
1074 static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
1075                         int count, int ypos, int xpos)
1076 {
1077         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1078         struct display *p = &fb_display[vc->vc_num];
1079         struct fbcon_ops *ops = info->fbcon_par;
1080
1081         if (!fbcon_is_inactive(vc, info))
1082                 ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
1083                            get_color(vc, info, scr_readw(s), 1),
1084                            get_color(vc, info, scr_readw(s), 0));
1085 }
1086
1087 static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
1088 {
1089         unsigned short chr;
1090
1091         scr_writew(c, &chr);
1092         fbcon_putcs(vc, &chr, 1, ypos, xpos);
1093 }
1094
1095 static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
1096 {
1097         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1098         struct fbcon_ops *ops = info->fbcon_par;
1099
1100         if (!fbcon_is_inactive(vc, info))
1101                 ops->clear_margins(vc, info, bottom_only);
1102 }
1103
1104 static void fbcon_cursor(struct vc_data *vc, int mode)
1105 {
1106         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1107         struct fbcon_ops *ops = info->fbcon_par;
1108         struct display *p = &fb_display[vc->vc_num];
1109         int y;
1110         int c = scr_readw((u16 *) vc->vc_pos);
1111
1112         if (fbcon_is_inactive(vc, info))
1113                 return;
1114
1115         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
1116         if (mode & CM_SOFTBACK) {
1117                 mode &= ~CM_SOFTBACK;
1118                 y = softback_lines;
1119         } else {
1120                 if (softback_lines)
1121                         fbcon_set_origin(vc);
1122                 y = 0;
1123         }
1124
1125         ops->cursor(vc, info, p, mode, y, get_color(vc, info, c, 1),
1126                     get_color(vc, info, c, 0));
1127         vbl_cursor_cnt = CURSOR_DRAW_DELAY;
1128 }
1129
1130 static int scrollback_phys_max = 0;
1131 static int scrollback_max = 0;
1132 static int scrollback_current = 0;
1133
1134 static int update_var(int con, struct fb_info *info)
1135 {
1136         if (con == ((struct fbcon_ops *)info->fbcon_par)->currcon)
1137                 return fb_pan_display(info, &info->var);
1138         return 0;
1139 }
1140
1141 /*
1142  * If no vc is existent yet, just set struct display
1143  */
1144 static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1145                               int unit)
1146 {
1147         struct display *p = &fb_display[unit];
1148         struct display *t = &fb_display[fg_console];
1149
1150         var->xoffset = var->yoffset = p->yscroll = 0;
1151         if (var_to_display(p, var, info))
1152                 return;
1153
1154         p->fontdata = t->fontdata;
1155         p->userfont = t->userfont;
1156         if (p->userfont)
1157                 REFCOUNT(p->fontdata)++;
1158 }
1159
1160 static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
1161                            struct vc_data *vc)
1162 {
1163         struct display *p = &fb_display[vc->vc_num], *t;
1164         struct vc_data **default_mode = vc->vc_display_fg;
1165         struct vc_data *svc = *default_mode;
1166         int rows, cols, charcnt = 256;
1167
1168         var->xoffset = var->yoffset = p->yscroll = 0;
1169         if (var_to_display(p, var, info))
1170                 return;
1171         t = &fb_display[svc->vc_num];
1172         if (!vc->vc_font.data) {
1173                 vc->vc_font.data = p->fontdata = t->fontdata;
1174                 vc->vc_font.width = (*default_mode)->vc_font.width;
1175                 vc->vc_font.height = (*default_mode)->vc_font.height;
1176                 p->userfont = t->userfont;
1177                 if (p->userfont)
1178                         REFCOUNT(p->fontdata)++;
1179         }
1180         if (p->userfont)
1181                 charcnt = FNTCHARCNT(p->fontdata);
1182
1183         vc->vc_can_do_color = (fb_get_color_depth(var) != 1);
1184         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1185         if (charcnt == 256) {
1186                 vc->vc_hi_font_mask = 0;
1187         } else {
1188                 vc->vc_hi_font_mask = 0x100;
1189                 if (vc->vc_can_do_color)
1190                         vc->vc_complement_mask <<= 1;
1191         }
1192
1193         if (!*svc->vc_uni_pagedir_loc)
1194                 con_set_default_unimap(svc);
1195         if (!*vc->vc_uni_pagedir_loc)
1196                 con_copy_unimap(vc, svc);
1197
1198         cols = var->xres / vc->vc_font.width;
1199         rows = var->yres / vc->vc_font.height;
1200         vc_resize(vc, cols, rows);
1201         if (CON_IS_VISIBLE(vc)) {
1202                 update_screen(vc);
1203                 if (softback_buf) {
1204                         int l = fbcon_softback_size / vc->vc_size_row;
1205
1206                         if (l > 5)
1207                                 softback_end = softback_buf + l *
1208                                         vc->vc_size_row;
1209                         else {
1210                                 /* Smaller scrollback makes no sense, and 0
1211                                    would screw the operation totally */
1212                                 softback_top = 0;
1213                         }
1214                 }
1215         }
1216 }
1217
1218 static __inline__ void ywrap_up(struct vc_data *vc, int count)
1219 {
1220         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1221         struct display *p = &fb_display[vc->vc_num];
1222
1223         p->yscroll += count;
1224         if (p->yscroll >= p->vrows)     /* Deal with wrap */
1225                 p->yscroll -= p->vrows;
1226         info->var.xoffset = 0;
1227         info->var.yoffset = p->yscroll * vc->vc_font.height;
1228         info->var.vmode |= FB_VMODE_YWRAP;
1229         update_var(vc->vc_num, info);
1230         scrollback_max += count;
1231         if (scrollback_max > scrollback_phys_max)
1232                 scrollback_max = scrollback_phys_max;
1233         scrollback_current = 0;
1234 }
1235
1236 static __inline__ void ywrap_down(struct vc_data *vc, int count)
1237 {
1238         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1239         struct display *p = &fb_display[vc->vc_num];
1240
1241         p->yscroll -= count;
1242         if (p->yscroll < 0)     /* Deal with wrap */
1243                 p->yscroll += p->vrows;
1244         info->var.xoffset = 0;
1245         info->var.yoffset = p->yscroll * vc->vc_font.height;
1246         info->var.vmode |= FB_VMODE_YWRAP;
1247         update_var(vc->vc_num, info);
1248         scrollback_max -= count;
1249         if (scrollback_max < 0)
1250                 scrollback_max = 0;
1251         scrollback_current = 0;
1252 }
1253
1254 static __inline__ void ypan_up(struct vc_data *vc, int count)
1255 {
1256         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1257         struct display *p = &fb_display[vc->vc_num];
1258         struct fbcon_ops *ops = info->fbcon_par;
1259
1260         p->yscroll += count;
1261         if (p->yscroll > p->vrows - vc->vc_rows) {
1262                 ops->bmove(vc, info, p->vrows - vc->vc_rows,
1263                             0, 0, 0, vc->vc_rows, vc->vc_cols);
1264                 p->yscroll -= p->vrows - vc->vc_rows;
1265         }
1266         info->var.xoffset = 0;
1267         info->var.yoffset = p->yscroll * vc->vc_font.height;
1268         info->var.vmode &= ~FB_VMODE_YWRAP;
1269         update_var(vc->vc_num, info);
1270         fbcon_clear_margins(vc, 1);
1271         scrollback_max += count;
1272         if (scrollback_max > scrollback_phys_max)
1273                 scrollback_max = scrollback_phys_max;
1274         scrollback_current = 0;
1275 }
1276
1277 static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
1278 {
1279         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1280         struct display *p = &fb_display[vc->vc_num];
1281         int redraw = 0;
1282
1283         p->yscroll += count;
1284         if (p->yscroll > p->vrows - vc->vc_rows) {
1285                 p->yscroll -= p->vrows - vc->vc_rows;
1286                 redraw = 1;
1287         }
1288
1289         info->var.xoffset = 0;
1290         info->var.yoffset = p->yscroll * vc->vc_font.height;
1291         info->var.vmode &= ~FB_VMODE_YWRAP;
1292         if (redraw)
1293                 fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
1294         update_var(vc->vc_num, info);
1295         fbcon_clear_margins(vc, 1);
1296         scrollback_max += count;
1297         if (scrollback_max > scrollback_phys_max)
1298                 scrollback_max = scrollback_phys_max;
1299         scrollback_current = 0;
1300 }
1301
1302 static __inline__ void ypan_down(struct vc_data *vc, int count)
1303 {
1304         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1305         struct display *p = &fb_display[vc->vc_num];
1306         struct fbcon_ops *ops = info->fbcon_par;
1307
1308         p->yscroll -= count;
1309         if (p->yscroll < 0) {
1310                 ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
1311                             0, vc->vc_rows, vc->vc_cols);
1312                 p->yscroll += p->vrows - vc->vc_rows;
1313         }
1314         info->var.xoffset = 0;
1315         info->var.yoffset = p->yscroll * vc->vc_font.height;
1316         info->var.vmode &= ~FB_VMODE_YWRAP;
1317         update_var(vc->vc_num, info);
1318         fbcon_clear_margins(vc, 1);
1319         scrollback_max -= count;
1320         if (scrollback_max < 0)
1321                 scrollback_max = 0;
1322         scrollback_current = 0;
1323 }
1324
1325 static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
1326 {
1327         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1328         struct display *p = &fb_display[vc->vc_num];
1329         int redraw = 0;
1330
1331         p->yscroll -= count;
1332         if (p->yscroll < 0) {
1333                 p->yscroll += p->vrows - vc->vc_rows;
1334                 redraw = 1;
1335         }
1336         info->var.xoffset = 0;
1337         info->var.yoffset = p->yscroll * vc->vc_font.height;
1338         info->var.vmode &= ~FB_VMODE_YWRAP;
1339         if (redraw)
1340                 fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
1341         update_var(vc->vc_num, info);
1342         fbcon_clear_margins(vc, 1);
1343         scrollback_max -= count;
1344         if (scrollback_max < 0)
1345                 scrollback_max = 0;
1346         scrollback_current = 0;
1347 }
1348
1349 static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
1350                                   long delta)
1351 {
1352         int count = vc->vc_rows;
1353         unsigned short *d, *s;
1354         unsigned long n;
1355         int line = 0;
1356
1357         d = (u16 *) softback_curr;
1358         if (d == (u16 *) softback_in)
1359                 d = (u16 *) vc->vc_origin;
1360         n = softback_curr + delta * vc->vc_size_row;
1361         softback_lines -= delta;
1362         if (delta < 0) {
1363                 if (softback_curr < softback_top && n < softback_buf) {
1364                         n += softback_end - softback_buf;
1365                         if (n < softback_top) {
1366                                 softback_lines -=
1367                                     (softback_top - n) / vc->vc_size_row;
1368                                 n = softback_top;
1369                         }
1370                 } else if (softback_curr >= softback_top
1371                            && n < softback_top) {
1372                         softback_lines -=
1373                             (softback_top - n) / vc->vc_size_row;
1374                         n = softback_top;
1375                 }
1376         } else {
1377                 if (softback_curr > softback_in && n >= softback_end) {
1378                         n += softback_buf - softback_end;
1379                         if (n > softback_in) {
1380                                 n = softback_in;
1381                                 softback_lines = 0;
1382                         }
1383                 } else if (softback_curr <= softback_in && n > softback_in) {
1384                         n = softback_in;
1385                         softback_lines = 0;
1386                 }
1387         }
1388         if (n == softback_curr)
1389                 return;
1390         softback_curr = n;
1391         s = (u16 *) softback_curr;
1392         if (s == (u16 *) softback_in)
1393                 s = (u16 *) vc->vc_origin;
1394         while (count--) {
1395                 unsigned short *start;
1396                 unsigned short *le;
1397                 unsigned short c;
1398                 int x = 0;
1399                 unsigned short attr = 1;
1400
1401                 start = s;
1402                 le = advance_row(s, 1);
1403                 do {
1404                         c = scr_readw(s);
1405                         if (attr != (c & 0xff00)) {
1406                                 attr = c & 0xff00;
1407                                 if (s > start) {
1408                                         fbcon_putcs(vc, start, s - start,
1409                                                     line, x);
1410                                         x += s - start;
1411                                         start = s;
1412                                 }
1413                         }
1414                         if (c == scr_readw(d)) {
1415                                 if (s > start) {
1416                                         fbcon_putcs(vc, start, s - start,
1417                                                     line, x);
1418                                         x += s - start + 1;
1419                                         start = s + 1;
1420                                 } else {
1421                                         x++;
1422                                         start++;
1423                                 }
1424                         }
1425                         s++;
1426                         d++;
1427                 } while (s < le);
1428                 if (s > start)
1429                         fbcon_putcs(vc, start, s - start, line, x);
1430                 line++;
1431                 if (d == (u16 *) softback_end)
1432                         d = (u16 *) softback_buf;
1433                 if (d == (u16 *) softback_in)
1434                         d = (u16 *) vc->vc_origin;
1435                 if (s == (u16 *) softback_end)
1436                         s = (u16 *) softback_buf;
1437                 if (s == (u16 *) softback_in)
1438                         s = (u16 *) vc->vc_origin;
1439         }
1440 }
1441
1442 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
1443                               int line, int count, int dy)
1444 {
1445         unsigned short *s = (unsigned short *)
1446                 (vc->vc_origin + vc->vc_size_row * line);
1447
1448         while (count--) {
1449                 unsigned short *start = s;
1450                 unsigned short *le = advance_row(s, 1);
1451                 unsigned short c;
1452                 int x = 0;
1453                 unsigned short attr = 1;
1454
1455                 do {
1456                         c = scr_readw(s);
1457                         if (attr != (c & 0xff00)) {
1458                                 attr = c & 0xff00;
1459                                 if (s > start) {
1460                                         fbcon_putcs(vc, start, s - start,
1461                                                     dy, x);
1462                                         x += s - start;
1463                                         start = s;
1464                                 }
1465                         }
1466                         console_conditional_schedule();
1467                         s++;
1468                 } while (s < le);
1469                 if (s > start)
1470                         fbcon_putcs(vc, start, s - start, dy, x);
1471                 console_conditional_schedule();
1472                 dy++;
1473         }
1474 }
1475
1476 static void fbcon_redraw(struct vc_data *vc, struct display *p,
1477                          int line, int count, int offset)
1478 {
1479         unsigned short *d = (unsigned short *)
1480             (vc->vc_origin + vc->vc_size_row * line);
1481         unsigned short *s = d + offset;
1482
1483         while (count--) {
1484                 unsigned short *start = s;
1485                 unsigned short *le = advance_row(s, 1);
1486                 unsigned short c;
1487                 int x = 0;
1488                 unsigned short attr = 1;
1489
1490                 do {
1491                         c = scr_readw(s);
1492                         if (attr != (c & 0xff00)) {
1493                                 attr = c & 0xff00;
1494                                 if (s > start) {
1495                                         fbcon_putcs(vc, start, s - start,
1496                                                     line, x);
1497                                         x += s - start;
1498                                         start = s;
1499                                 }
1500                         }
1501                         if (c == scr_readw(d)) {
1502                                 if (s > start) {
1503                                         fbcon_putcs(vc, start, s - start,
1504                                                      line, x);
1505                                         x += s - start + 1;
1506                                         start = s + 1;
1507                                 } else {
1508                                         x++;
1509                                         start++;
1510                                 }
1511                         }
1512                         scr_writew(c, d);
1513                         console_conditional_schedule();
1514                         s++;
1515                         d++;
1516                 } while (s < le);
1517                 if (s > start)
1518                         fbcon_putcs(vc, start, s - start, line, x);
1519                 console_conditional_schedule();
1520                 if (offset > 0)
1521                         line++;
1522                 else {
1523                         line--;
1524                         /* NOTE: We subtract two lines from these pointers */
1525                         s -= vc->vc_size_row;
1526                         d -= vc->vc_size_row;
1527                 }
1528         }
1529 }
1530
1531 static inline void fbcon_softback_note(struct vc_data *vc, int t,
1532                                        int count)
1533 {
1534         unsigned short *p;
1535
1536         if (vc->vc_num != fg_console)
1537                 return;
1538         p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
1539
1540         while (count) {
1541                 scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
1542                 count--;
1543                 p = advance_row(p, 1);
1544                 softback_in += vc->vc_size_row;
1545                 if (softback_in == softback_end)
1546                         softback_in = softback_buf;
1547                 if (softback_in == softback_top) {
1548                         softback_top += vc->vc_size_row;
1549                         if (softback_top == softback_end)
1550                                 softback_top = softback_buf;
1551                 }
1552         }
1553         softback_curr = softback_in;
1554 }
1555
1556 static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
1557                         int count)
1558 {
1559         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1560         struct display *p = &fb_display[vc->vc_num];
1561         struct fbcon_ops *ops = info->fbcon_par;
1562         int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
1563
1564         if (fbcon_is_inactive(vc, info))
1565                 return -EINVAL;
1566
1567         fbcon_cursor(vc, CM_ERASE);
1568
1569         /*
1570          * ++Geert: Only use ywrap/ypan if the console is in text mode
1571          * ++Andrew: Only use ypan on hardware text mode when scrolling the
1572          *           whole screen (prevents flicker).
1573          */
1574
1575         switch (dir) {
1576         case SM_UP:
1577                 if (count > vc->vc_rows)        /* Maximum realistic size */
1578                         count = vc->vc_rows;
1579                 if (softback_top)
1580                         fbcon_softback_note(vc, t, count);
1581                 if (logo_shown >= 0)
1582                         goto redraw_up;
1583                 switch (p->scrollmode) {
1584                 case SCROLL_MOVE:
1585                         ops->bmove(vc, info, t + count, 0, t, 0,
1586                                     b - t - count, vc->vc_cols);
1587                         ops->clear(vc, info, b - count, 0, count,
1588                                   vc->vc_cols);
1589                         break;
1590
1591                 case SCROLL_WRAP_MOVE:
1592                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1593                                 if (t > 0)
1594                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1595                                                     vc->vc_cols);
1596                                 ywrap_up(vc, count);
1597                                 if (vc->vc_rows - b > 0)
1598                                         fbcon_bmove(vc, b - count, 0, b, 0,
1599                                                     vc->vc_rows - b,
1600                                                     vc->vc_cols);
1601                         } else if (info->flags & FBINFO_READS_FAST)
1602                                 fbcon_bmove(vc, t + count, 0, t, 0,
1603                                             b - t - count, vc->vc_cols);
1604                         else
1605                                 goto redraw_up;
1606                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1607                         break;
1608
1609                 case SCROLL_PAN_REDRAW:
1610                         if ((p->yscroll + count <=
1611                              2 * (p->vrows - vc->vc_rows))
1612                             && ((!scroll_partial && (b - t == vc->vc_rows))
1613                                 || (scroll_partial
1614                                     && (b - t - count >
1615                                         3 * vc->vc_rows >> 2)))) {
1616                                 if (t > 0)
1617                                         fbcon_redraw_move(vc, p, 0, t, count);
1618                                 ypan_up_redraw(vc, t, count);
1619                                 if (vc->vc_rows - b > 0)
1620                                         fbcon_redraw_move(vc, p, b - count,
1621                                                           vc->vc_rows - b, b);
1622                         } else
1623                                 fbcon_redraw_move(vc, p, t + count, b - t - count, t);
1624                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1625                         break;
1626
1627                 case SCROLL_PAN_MOVE:
1628                         if ((p->yscroll + count <=
1629                              2 * (p->vrows - vc->vc_rows))
1630                             && ((!scroll_partial && (b - t == vc->vc_rows))
1631                                 || (scroll_partial
1632                                     && (b - t - count >
1633                                         3 * vc->vc_rows >> 2)))) {
1634                                 if (t > 0)
1635                                         fbcon_bmove(vc, 0, 0, count, 0, t,
1636                                                     vc->vc_cols);
1637                                 ypan_up(vc, count);
1638                                 if (vc->vc_rows - b > 0)
1639                                         fbcon_bmove(vc, b - count, 0, b, 0,
1640                                                     vc->vc_rows - b,
1641                                                     vc->vc_cols);
1642                         } else if (info->flags & FBINFO_READS_FAST)
1643                                 fbcon_bmove(vc, t + count, 0, t, 0,
1644                                             b - t - count, vc->vc_cols);
1645                         else
1646                                 goto redraw_up;
1647                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1648                         break;
1649
1650                 case SCROLL_REDRAW:
1651                       redraw_up:
1652                         fbcon_redraw(vc, p, t, b - t - count,
1653                                      count * vc->vc_cols);
1654                         fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
1655                         scr_memsetw((unsigned short *) (vc->vc_origin +
1656                                                         vc->vc_size_row *
1657                                                         (b - count)),
1658                                     vc->vc_video_erase_char,
1659                                     vc->vc_size_row * count);
1660                         return 1;
1661                 }
1662                 break;
1663
1664         case SM_DOWN:
1665                 if (count > vc->vc_rows)        /* Maximum realistic size */
1666                         count = vc->vc_rows;
1667                 switch (p->scrollmode) {
1668                 case SCROLL_MOVE:
1669                         ops->bmove(vc, info, t, 0, t + count, 0,
1670                                     b - t - count, vc->vc_cols);
1671                         ops->clear(vc, info, t, 0, count, vc->vc_cols);
1672                         break;
1673
1674                 case SCROLL_WRAP_MOVE:
1675                         if (b - t - count > 3 * vc->vc_rows >> 2) {
1676                                 if (vc->vc_rows - b > 0)
1677                                         fbcon_bmove(vc, b, 0, b - count, 0,
1678                                                     vc->vc_rows - b,
1679                                                     vc->vc_cols);
1680                                 ywrap_down(vc, count);
1681                                 if (t > 0)
1682                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1683                                                     vc->vc_cols);
1684                         } else if (info->flags & FBINFO_READS_FAST)
1685                                 fbcon_bmove(vc, t, 0, t + count, 0,
1686                                             b - t - count, vc->vc_cols);
1687                         else
1688                                 goto redraw_down;
1689                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1690                         break;
1691
1692                 case SCROLL_PAN_MOVE:
1693                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1694                             && ((!scroll_partial && (b - t == vc->vc_rows))
1695                                 || (scroll_partial
1696                                     && (b - t - count >
1697                                         3 * vc->vc_rows >> 2)))) {
1698                                 if (vc->vc_rows - b > 0)
1699                                         fbcon_bmove(vc, b, 0, b - count, 0,
1700                                                     vc->vc_rows - b,
1701                                                     vc->vc_cols);
1702                                 ypan_down(vc, count);
1703                                 if (t > 0)
1704                                         fbcon_bmove(vc, count, 0, 0, 0, t,
1705                                                     vc->vc_cols);
1706                         } else if (info->flags & FBINFO_READS_FAST)
1707                                 fbcon_bmove(vc, t, 0, t + count, 0,
1708                                             b - t - count, vc->vc_cols);
1709                         else
1710                                 goto redraw_down;
1711                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1712                         break;
1713
1714                 case SCROLL_PAN_REDRAW:
1715                         if ((count - p->yscroll <= p->vrows - vc->vc_rows)
1716                             && ((!scroll_partial && (b - t == vc->vc_rows))
1717                                 || (scroll_partial
1718                                     && (b - t - count >
1719                                         3 * vc->vc_rows >> 2)))) {
1720                                 if (vc->vc_rows - b > 0)
1721                                         fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
1722                                                           b - count);
1723                                 ypan_down_redraw(vc, t, count);
1724                                 if (t > 0)
1725                                         fbcon_redraw_move(vc, p, count, t, 0);
1726                         } else
1727                                 fbcon_redraw_move(vc, p, t, b - t - count, t + count);
1728                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1729                         break;
1730
1731                 case SCROLL_REDRAW:
1732                       redraw_down:
1733                         fbcon_redraw(vc, p, b - 1, b - t - count,
1734                                      -count * vc->vc_cols);
1735                         fbcon_clear(vc, t, 0, count, vc->vc_cols);
1736                         scr_memsetw((unsigned short *) (vc->vc_origin +
1737                                                         vc->vc_size_row *
1738                                                         t),
1739                                     vc->vc_video_erase_char,
1740                                     vc->vc_size_row * count);
1741                         return 1;
1742                 }
1743         }
1744         return 0;
1745 }
1746
1747
1748 static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
1749                         int height, int width)
1750 {
1751         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1752         struct display *p = &fb_display[vc->vc_num];
1753
1754         if (fbcon_is_inactive(vc, info))
1755                 return;
1756
1757         if (!width || !height)
1758                 return;
1759
1760         /*  Split blits that cross physical y_wrap case.
1761          *  Pathological case involves 4 blits, better to use recursive
1762          *  code rather than unrolled case
1763          *
1764          *  Recursive invocations don't need to erase the cursor over and
1765          *  over again, so we use fbcon_bmove_rec()
1766          */
1767         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
1768                         p->vrows - p->yscroll);
1769 }
1770
1771 static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
1772                             int dy, int dx, int height, int width, u_int y_break)
1773 {
1774         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1775         struct fbcon_ops *ops = info->fbcon_par;
1776         u_int b;
1777
1778         if (sy < y_break && sy + height > y_break) {
1779                 b = y_break - sy;
1780                 if (dy < sy) {  /* Avoid trashing self */
1781                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1782                                         y_break);
1783                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1784                                         height - b, width, y_break);
1785                 } else {
1786                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1787                                         height - b, width, y_break);
1788                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1789                                         y_break);
1790                 }
1791                 return;
1792         }
1793
1794         if (dy < y_break && dy + height > y_break) {
1795                 b = y_break - dy;
1796                 if (dy < sy) {  /* Avoid trashing self */
1797                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1798                                         y_break);
1799                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1800                                         height - b, width, y_break);
1801                 } else {
1802                         fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
1803                                         height - b, width, y_break);
1804                         fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
1805                                         y_break);
1806                 }
1807                 return;
1808         }
1809         ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
1810                    height, width);
1811 }
1812
1813 static __inline__ void updatescrollmode(struct display *p, struct fb_info *info,
1814                                         struct vc_data *vc)
1815 {
1816         int fh = vc->vc_font.height;
1817         int cap = info->flags;
1818         int good_pan = (cap & FBINFO_HWACCEL_YPAN)
1819                  && divides(info->fix.ypanstep, vc->vc_font.height)
1820                  && info->var.yres_virtual > info->var.yres;
1821         int good_wrap = (cap & FBINFO_HWACCEL_YWRAP)
1822                  && divides(info->fix.ywrapstep, vc->vc_font.height)
1823                  && divides(vc->vc_font.height, info->var.yres_virtual);
1824         int reading_fast = cap & FBINFO_READS_FAST;
1825         int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) && !(cap & FBINFO_HWACCEL_DISABLED);
1826         int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) && !(cap & FBINFO_HWACCEL_DISABLED);
1827
1828         p->vrows = info->var.yres_virtual/fh;
1829         if (info->var.yres > (fh * (vc->vc_rows + 1)))
1830                 p->vrows -= (info->var.yres - (fh * vc->vc_rows)) / fh;
1831         if ((info->var.yres % fh) && (info->var.yres_virtual % fh <
1832                                       info->var.yres % fh))
1833                 p->vrows--;
1834
1835         if (good_wrap || good_pan) {
1836                 if (reading_fast || fast_copyarea)
1837                         p->scrollmode = good_wrap ? SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
1838                 else
1839                         p->scrollmode = good_wrap ? SCROLL_REDRAW :
1840                                 SCROLL_PAN_REDRAW;
1841         } else {
1842                 if (reading_fast || (fast_copyarea && !fast_imageblit))
1843                         p->scrollmode = SCROLL_MOVE;
1844                 else
1845                         p->scrollmode = SCROLL_REDRAW;
1846         }
1847 }
1848
1849 static int fbcon_resize(struct vc_data *vc, unsigned int width,
1850                         unsigned int height)
1851 {
1852         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
1853         struct display *p = &fb_display[vc->vc_num];
1854         struct fb_var_screeninfo var = info->var;
1855         int x_diff, y_diff;
1856         int fw = vc->vc_font.width;
1857         int fh = vc->vc_font.height;
1858
1859         var.xres = width * fw;
1860         var.yres = height * fh;
1861         x_diff = info->var.xres - var.xres;
1862         y_diff = info->var.yres - var.yres;
1863         if (x_diff < 0 || x_diff > fw || (y_diff < 0 || y_diff > fh)) {
1864                 struct fb_videomode *mode;
1865
1866                 DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
1867                 mode = fb_find_best_mode(&var, &info->modelist);
1868                 if (mode == NULL)
1869                         return -EINVAL;
1870                 fb_videomode_to_var(&var, mode);
1871                 if (width > var.xres/fw || height > var.yres/fh)
1872                         return -EINVAL;
1873                 /*
1874                  * The following can probably have any value... Do we need to
1875                  * set all of them?
1876                  */
1877                 var.bits_per_pixel = p->bits_per_pixel;
1878                 var.xres_virtual = p->xres_virtual;
1879                 var.yres_virtual = p->yres_virtual;
1880                 var.accel_flags = p->accel_flags;
1881                 var.width = p->width;
1882                 var.height = p->height;
1883                 var.red = p->red;
1884                 var.green = p->green;
1885                 var.blue = p->blue;
1886                 var.transp = p->transp;
1887                 var.nonstd = p->nonstd;
1888
1889                 DPRINTK("resize now %ix%i\n", var.xres, var.yres);
1890                 if (CON_IS_VISIBLE(vc)) {
1891                         var.activate = FB_ACTIVATE_NOW |
1892                                 FB_ACTIVATE_FORCE;
1893                         fb_set_var(info, &var);
1894                 }
1895                 var_to_display(p, &info->var, info);
1896         }
1897         updatescrollmode(p, info, vc);
1898         return 0;
1899 }
1900
1901 static int fbcon_switch(struct vc_data *vc)
1902 {
1903         struct fb_info *info;
1904         struct display *p = &fb_display[vc->vc_num];
1905         struct fb_var_screeninfo var;
1906         int i, prev_console;
1907
1908         info = registered_fb[con2fb_map[vc->vc_num]];
1909
1910         if (softback_top) {
1911                 int l = fbcon_softback_size / vc->vc_size_row;
1912                 if (softback_lines)
1913                         fbcon_set_origin(vc);
1914                 softback_top = softback_curr = softback_in = softback_buf;
1915                 softback_lines = 0;
1916
1917                 if (l > 5)
1918                         softback_end = softback_buf + l * vc->vc_size_row;
1919                 else {
1920                         /* Smaller scrollback makes no sense, and 0 would screw
1921                            the operation totally */
1922                         softback_top = 0;
1923                 }
1924         }
1925
1926         if (logo_shown >= 0) {
1927                 struct vc_data *conp2 = vc_cons[logo_shown].d;
1928
1929                 if (conp2->vc_top == logo_lines
1930                     && conp2->vc_bottom == conp2->vc_rows)
1931                         conp2->vc_top = 0;
1932                 logo_shown = FBCON_LOGO_CANSHOW;
1933         }
1934
1935         prev_console = ((struct fbcon_ops *)info->fbcon_par)->currcon;
1936
1937         /*
1938          * FIXME: If we have multiple fbdev's loaded, we need to
1939          * update all info->currcon.  Perhaps, we can place this
1940          * in a centralized structure, but this might break some
1941          * drivers.
1942          *
1943          * info->currcon = vc->vc_num;
1944          */
1945         for (i = 0; i < FB_MAX; i++) {
1946                 if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
1947                         struct fbcon_ops *ops = registered_fb[i]->fbcon_par;
1948
1949                         ops->currcon = vc->vc_num;
1950                 }
1951         }
1952         memset(&var, 0, sizeof(struct fb_var_screeninfo));
1953         display_to_var(&var, p);
1954         var.activate = FB_ACTIVATE_NOW;
1955
1956         /*
1957          * make sure we don't unnecessarily trip the memcmp()
1958          * in fb_set_var()
1959          */
1960         info->var.activate = var.activate;
1961         info->var.yoffset = info->var.xoffset = p->yscroll = 0;
1962         fb_set_var(info, &var);
1963
1964         if (prev_console != -1 &&
1965             registered_fb[con2fb_map[prev_console]] != info &&
1966             info->fbops->fb_set_par)
1967                 info->fbops->fb_set_par(info);
1968
1969         set_blitting_type(vc, info, p);
1970         ((struct fbcon_ops *)info->fbcon_par)->cursor_reset = 1;
1971
1972         vc->vc_can_do_color = (fb_get_color_depth(&info->var) != 1);
1973         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1974         updatescrollmode(p, info, vc);
1975
1976         switch (p->scrollmode) {
1977         case SCROLL_WRAP_MOVE:
1978                 scrollback_phys_max = p->vrows - vc->vc_rows;
1979                 break;
1980         case SCROLL_PAN_MOVE:
1981         case SCROLL_PAN_REDRAW:
1982                 scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
1983                 if (scrollback_phys_max < 0)
1984                         scrollback_phys_max = 0;
1985                 break;
1986         default:
1987                 scrollback_phys_max = 0;
1988                 break;
1989         }
1990         scrollback_max = 0;
1991         scrollback_current = 0;
1992
1993         update_var(vc->vc_num, info);
1994         fbcon_set_palette(vc, color_table);
1995         fbcon_clear_margins(vc, 0);
1996
1997         if (logo_shown == FBCON_LOGO_DRAW) {
1998
1999                 logo_shown = fg_console;
2000                 /* This is protected above by initmem_freed */
2001                 fb_show_logo(info);
2002                 update_region(vc,
2003                               vc->vc_origin + vc->vc_size_row * vc->vc_top,
2004                               vc->vc_size_row * (vc->vc_bottom -
2005                                                  vc->vc_top) / 2);
2006                 return 0;
2007         }
2008         return 1;
2009 }
2010
2011 static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
2012                                 int blank)
2013 {
2014         if (blank) {
2015                 unsigned short charmask = vc->vc_hi_font_mask ?
2016                         0x1ff : 0xff;
2017                 unsigned short oldc;
2018
2019                 oldc = vc->vc_video_erase_char;
2020                 vc->vc_video_erase_char &= charmask;
2021                 fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
2022                 vc->vc_video_erase_char = oldc;
2023         }
2024 }
2025
2026 static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
2027 {
2028         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2029         struct fbcon_ops *ops = info->fbcon_par;
2030
2031         if (mode_switch) {
2032                 struct fb_var_screeninfo var = info->var;
2033
2034                 ops->graphics = 1;
2035
2036                 if (!blank) {
2037                         var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
2038                         fb_set_var(info, &var);
2039                         ops->graphics = 0;
2040                 }
2041         }
2042
2043         if (!fbcon_is_inactive(vc, info)) {
2044                 if (ops->blank_state != blank) {
2045                         ops->blank_state = blank;
2046                         fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
2047                         ops->cursor_flash = (!blank);
2048
2049                         if (fb_blank(info, blank))
2050                                 fbcon_generic_blank(vc, info, blank);
2051                 }
2052
2053                 if (!blank)
2054                         update_screen(vc);
2055         }
2056
2057         return 0;
2058 }
2059
2060 static void fbcon_free_font(struct display *p)
2061 {
2062         if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
2063                 kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
2064         p->fontdata = NULL;
2065         p->userfont = 0;
2066 }
2067
2068 static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
2069 {
2070         u8 *fontdata = vc->vc_font.data;
2071         u8 *data = font->data;
2072         int i, j;
2073
2074         font->width = vc->vc_font.width;
2075         font->height = vc->vc_font.height;
2076         font->charcount = vc->vc_hi_font_mask ? 512 : 256;
2077         if (!font->data)
2078                 return 0;
2079
2080         if (font->width <= 8) {
2081                 j = vc->vc_font.height;
2082                 for (i = 0; i < font->charcount; i++) {
2083                         memcpy(data, fontdata, j);
2084                         memset(data + j, 0, 32 - j);
2085                         data += 32;
2086                         fontdata += j;
2087                 }
2088         } else if (font->width <= 16) {
2089                 j = vc->vc_font.height * 2;
2090                 for (i = 0; i < font->charcount; i++) {
2091                         memcpy(data, fontdata, j);
2092                         memset(data + j, 0, 64 - j);
2093                         data += 64;
2094                         fontdata += j;
2095                 }
2096         } else if (font->width <= 24) {
2097                 for (i = 0; i < font->charcount; i++) {
2098                         for (j = 0; j < vc->vc_font.height; j++) {
2099                                 *data++ = fontdata[0];
2100                                 *data++ = fontdata[1];
2101                                 *data++ = fontdata[2];
2102                                 fontdata += sizeof(u32);
2103                         }
2104                         memset(data, 0, 3 * (32 - j));
2105                         data += 3 * (32 - j);
2106                 }
2107         } else {
2108                 j = vc->vc_font.height * 4;
2109                 for (i = 0; i < font->charcount; i++) {
2110                         memcpy(data, fontdata, j);
2111                         memset(data + j, 0, 128 - j);
2112                         data += 128;
2113                         fontdata += j;
2114                 }
2115         }
2116         return 0;
2117 }
2118
2119 static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
2120                              u8 * data, int userfont)
2121 {
2122         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2123         struct display *p = &fb_display[vc->vc_num];
2124         int resize;
2125         int cnt;
2126         char *old_data = NULL;
2127
2128         if (CON_IS_VISIBLE(vc) && softback_lines)
2129                 fbcon_set_origin(vc);
2130
2131         resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
2132         if (p->userfont)
2133                 old_data = vc->vc_font.data;
2134         if (userfont)
2135                 cnt = FNTCHARCNT(data);
2136         else
2137                 cnt = 256;
2138         vc->vc_font.data = p->fontdata = data;
2139         if ((p->userfont = userfont))
2140                 REFCOUNT(data)++;
2141         vc->vc_font.width = w;
2142         vc->vc_font.height = h;
2143         if (vc->vc_hi_font_mask && cnt == 256) {
2144                 vc->vc_hi_font_mask = 0;
2145                 if (vc->vc_can_do_color) {
2146                         vc->vc_complement_mask >>= 1;
2147                         vc->vc_s_complement_mask >>= 1;
2148                 }
2149
2150                 /* ++Edmund: reorder the attribute bits */
2151                 if (vc->vc_can_do_color) {
2152                         unsigned short *cp =
2153                             (unsigned short *) vc->vc_origin;
2154                         int count = vc->vc_screenbuf_size / 2;
2155                         unsigned short c;
2156                         for (; count > 0; count--, cp++) {
2157                                 c = scr_readw(cp);
2158                                 scr_writew(((c & 0xfe00) >> 1) |
2159                                            (c & 0xff), cp);
2160                         }
2161                         c = vc->vc_video_erase_char;
2162                         vc->vc_video_erase_char =
2163                             ((c & 0xfe00) >> 1) | (c & 0xff);
2164                         vc->vc_attr >>= 1;
2165                 }
2166         } else if (!vc->vc_hi_font_mask && cnt == 512) {
2167                 vc->vc_hi_font_mask = 0x100;
2168                 if (vc->vc_can_do_color) {
2169                         vc->vc_complement_mask <<= 1;
2170                         vc->vc_s_complement_mask <<= 1;
2171                 }
2172
2173                 /* ++Edmund: reorder the attribute bits */
2174                 {
2175                         unsigned short *cp =
2176                             (unsigned short *) vc->vc_origin;
2177                         int count = vc->vc_screenbuf_size / 2;
2178                         unsigned short c;
2179                         for (; count > 0; count--, cp++) {
2180                                 unsigned short newc;
2181                                 c = scr_readw(cp);
2182                                 if (vc->vc_can_do_color)
2183                                         newc =
2184                                             ((c & 0xff00) << 1) | (c &
2185                                                                    0xff);
2186                                 else
2187                                         newc = c & ~0x100;
2188                                 scr_writew(newc, cp);
2189                         }
2190                         c = vc->vc_video_erase_char;
2191                         if (vc->vc_can_do_color) {
2192                                 vc->vc_video_erase_char =
2193                                     ((c & 0xff00) << 1) | (c & 0xff);
2194                                 vc->vc_attr <<= 1;
2195                         } else
2196                                 vc->vc_video_erase_char = c & ~0x100;
2197                 }
2198
2199         }
2200
2201         if (resize) {
2202                 /* reset wrap/pan */
2203                 info->var.xoffset = info->var.yoffset = p->yscroll = 0;
2204                 vc_resize(vc, info->var.xres / w, info->var.yres / h);
2205                 if (CON_IS_VISIBLE(vc) && softback_buf) {
2206                         int l = fbcon_softback_size / vc->vc_size_row;
2207                         if (l > 5)
2208                                 softback_end =
2209                                     softback_buf + l * vc->vc_size_row;
2210                         else {
2211                                 /* Smaller scrollback makes no sense, and 0 would screw
2212                                    the operation totally */
2213                                 softback_top = 0;
2214                         }
2215                 }
2216         } else if (CON_IS_VISIBLE(vc)
2217                    && vc->vc_mode == KD_TEXT) {
2218                 fbcon_clear_margins(vc, 0);
2219                 update_screen(vc);
2220         }
2221
2222         if (old_data && (--REFCOUNT(old_data) == 0))
2223                 kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
2224         return 0;
2225 }
2226
2227 static int fbcon_copy_font(struct vc_data *vc, int con)
2228 {
2229         struct display *od = &fb_display[con];
2230         struct console_font *f = &vc->vc_font;
2231
2232         if (od->fontdata == f->data)
2233                 return 0;       /* already the same font... */
2234         return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
2235 }
2236
2237 /*
2238  *  User asked to set font; we are guaranteed that
2239  *      a) width and height are in range 1..32
2240  *      b) charcount does not exceed 512
2241  *  but lets not assume that, since someone might someday want to use larger
2242  *  fonts. And charcount of 512 is small for unicode support.
2243  *
2244  *  However, user space gives the font in 32 rows , regardless of
2245  *  actual font height. So a new API is needed if support for larger fonts
2246  *  is ever implemented.
2247  */
2248
2249 static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
2250 {
2251         unsigned charcount = font->charcount;
2252         int w = font->width;
2253         int h = font->height;
2254         int size;
2255         int i, csum;
2256         u8 *new_data, *data = font->data;
2257         int pitch = (font->width+7) >> 3;
2258
2259         /* Is there a reason why fbconsole couldn't handle any charcount >256?
2260          * If not this check should be changed to charcount < 256 */
2261         if (charcount != 256 && charcount != 512)
2262                 return -EINVAL;
2263
2264         size = h * pitch * charcount;
2265
2266         new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);
2267
2268         if (!new_data)
2269                 return -ENOMEM;
2270
2271         new_data += FONT_EXTRA_WORDS * sizeof(int);
2272         FNTSIZE(new_data) = size;
2273         FNTCHARCNT(new_data) = charcount;
2274         REFCOUNT(new_data) = 0; /* usage counter */
2275         for (i=0; i< charcount; i++) {
2276                 memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
2277         }
2278
2279         /* Since linux has a nice crc32 function use it for counting font
2280          * checksums. */
2281         csum = crc32(0, new_data, size);
2282
2283         FNTSUM(new_data) = csum;
2284         /* Check if the same font is on some other console already */
2285         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2286                 struct vc_data *tmp = vc_cons[i].d;
2287
2288                 if (fb_display[i].userfont &&
2289                     fb_display[i].fontdata &&
2290                     FNTSUM(fb_display[i].fontdata) == csum &&
2291                     FNTSIZE(fb_display[i].fontdata) == size &&
2292                     tmp->vc_font.width == w &&
2293                     !memcmp(fb_display[i].fontdata, new_data, size)) {
2294                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
2295                         new_data = fb_display[i].fontdata;
2296                         break;
2297                 }
2298         }
2299         return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
2300 }
2301
2302 static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
2303 {
2304         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2305         struct font_desc *f;
2306
2307         if (!name)
2308                 f = get_default_font(info->var.xres, info->var.yres);
2309         else if (!(f = find_font(name)))
2310                 return -ENOENT;
2311
2312         font->width = f->width;
2313         font->height = f->height;
2314         return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
2315 }
2316
2317 static u16 palette_red[16];
2318 static u16 palette_green[16];
2319 static u16 palette_blue[16];
2320
2321 static struct fb_cmap palette_cmap = {
2322         0, 16, palette_red, palette_green, palette_blue, NULL
2323 };
2324
2325 static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
2326 {
2327         struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
2328         int i, j, k, depth;
2329         u8 val;
2330
2331         if (fbcon_is_inactive(vc, info))
2332                 return -EINVAL;
2333
2334         if (!CON_IS_VISIBLE(vc))
2335                 return 0;
2336
2337         depth = fb_get_color_depth(&info->var);
2338         if (depth > 3) {
2339                 for (i = j = 0; i < 16; i++) {
2340                         k = table[i];
2341                         val = vc->vc_palette[j++];
2342                         palette_red[k] = (val << 8) | val;
2343                         val = vc->vc_palette[j++];
2344                         palette_green[k] = (val << 8) | val;
2345                         val = vc->vc_palette[j++];
2346                         palette_blue[k] = (val << 8) | val;
2347                 }
2348                 palette_cmap.len = 16;
2349                 palette_cmap.start = 0;
2350         /*
2351          * If framebuffer is capable of less than 16 colors,
2352          * use default palette of fbcon.
2353          */
2354         } else
2355                 fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);
2356
2357         return fb_set_cmap(&palette_cmap, info);
2358 }
2359
2360 static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
2361 {
2362         unsigned long p;
2363         int line;
2364
2365         if (vc->vc_num != fg_console || !softback_lines)
2366                 return (u16 *) (vc->vc_origin + offset);
2367         line = offset / vc->vc_size_row;
2368         if (line >= softback_lines)
2369                 return (u16 *) (vc->vc_origin + offset -
2370                                 softback_lines * vc->vc_size_row);
2371         p = softback_curr + offset;
2372         if (p >= softback_end)
2373                 p += softback_buf - softback_end;
2374         return (u16 *) p;
2375 }
2376
2377 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
2378                                  int *px, int *py)
2379 {
2380         unsigned long ret;
2381         int x, y;
2382
2383         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
2384                 unsigned long offset = (pos - vc->vc_origin) / 2;
2385
2386                 x = offset % vc->vc_cols;
2387                 y = offset / vc->vc_cols;
2388                 if (vc->vc_num == fg_console)
2389                         y += softback_lines;
2390                 ret = pos + (vc->vc_cols - x) * 2;
2391         } else if (vc->vc_num == fg_console && softback_lines) {
2392                 unsigned long offset = pos - softback_curr;
2393
2394                 if (pos < softback_curr)
2395                         offset += softback_end - softback_buf;
2396                 offset /= 2;
2397                 x = offset % vc->vc_cols;
2398                 y = offset / vc->vc_cols;
2399                 ret = pos + (vc->vc_cols - x) * 2;
2400                 if (ret == softback_end)
2401                         ret = softback_buf;
2402                 if (ret == softback_in)
2403                         ret = vc->vc_origin;
2404         } else {
2405                 /* Should not happen */
2406                 x = y = 0;
2407                 ret = vc->vc_origin;
2408         }
2409         if (px)
2410                 *px = x;
2411         if (py)
2412                 *py = y;
2413         return ret;
2414 }
2415
2416 /* As we might be inside of softback, we may work with non-contiguous buffer,
2417    that's why we have to use a separate routine. */
2418 static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
2419 {
2420         while (cnt--) {
2421                 u16 a = scr_readw(p);
2422                 if (!vc->vc_can_do_color)
2423                         a ^= 0x0800;
2424                 else if (vc->vc_hi_font_mask == 0x100)
2425                         a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
2426                             (((a) & 0x0e00) << 4);
2427                 else
2428                         a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
2429                             (((a) & 0x0700) << 4);
2430                 scr_writew(a, p++);
2431                 if (p == (u16 *) softback_end)
2432                         p = (u16 *) softback_buf;
2433                 if (p == (u16 *) softback_in)
2434                         p = (u16 *) vc->vc_origin;
2435         }
2436 }
2437
2438 static int fbcon_scrolldelta(struct vc_data *vc, int lines)
2439 {
2440         struct fb_info *info = registered_fb[con2fb_map[fg_console]];
2441         struct display *p = &fb_display[fg_console];
2442         int offset, limit, scrollback_old;
2443
2444         if (softback_top) {
2445                 if (vc->vc_num != fg_console)
2446                         return 0;
2447                 if (vc->vc_mode != KD_TEXT || !lines)
2448                         return 0;
2449                 if (logo_shown >= 0) {
2450                         struct vc_data *conp2 = vc_cons[logo_shown].d;
2451
2452                         if (conp2->vc_top == logo_lines
2453                             && conp2->vc_bottom == conp2->vc_rows)
2454                                 conp2->vc_top = 0;
2455                         if (logo_shown == vc->vc_num) {
2456                                 unsigned long p, q;
2457                                 int i;
2458
2459                                 p = softback_in;
2460                                 q = vc->vc_origin +
2461                                     logo_lines * vc->vc_size_row;
2462                                 for (i = 0; i < logo_lines; i++) {
2463                                         if (p == softback_top)
2464                                                 break;
2465                                         if (p == softback_buf)
2466                                                 p = softback_end;
2467                                         p -= vc->vc_size_row;
2468                                         q -= vc->vc_size_row;
2469                                         scr_memcpyw((u16 *) q, (u16 *) p,
2470                                                     vc->vc_size_row);
2471                                 }
2472                                 softback_in = p;
2473                                 update_region(vc, vc->vc_origin,
2474                                               logo_lines * vc->vc_cols);
2475                         }
2476                         logo_shown = FBCON_LOGO_CANSHOW;
2477                 }
2478                 fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
2479                 fbcon_redraw_softback(vc, p, lines);
2480                 fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
2481                 return 0;
2482         }
2483
2484         if (!scrollback_phys_max)
2485                 return -ENOSYS;
2486
2487         scrollback_old = scrollback_current;
2488         scrollback_current -= lines;
2489         if (scrollback_current < 0)
2490                 scrollback_current = 0;
2491         else if (scrollback_current > scrollback_max)
2492                 scrollback_current = scrollback_max;
2493         if (scrollback_current == scrollback_old)
2494                 return 0;
2495
2496         if (fbcon_is_inactive(vc, info))
2497                 return 0;
2498
2499         fbcon_cursor(vc, CM_ERASE);
2500
2501         offset = p->yscroll - scrollback_current;
2502         limit = p->vrows;
2503         switch (p->scrollmode) {
2504         case SCROLL_WRAP_MOVE:
2505                 info->var.vmode |= FB_VMODE_YWRAP;
2506                 break;
2507         case SCROLL_PAN_MOVE:
2508         case SCROLL_PAN_REDRAW:
2509                 limit -= vc->vc_rows;
2510                 info->var.vmode &= ~FB_VMODE_YWRAP;
2511                 break;
2512         }
2513         if (offset < 0)
2514                 offset += limit;
2515         else if (offset >= limit)
2516                 offset -= limit;
2517         info->var.xoffset = 0;
2518         info->var.yoffset = offset * vc->vc_font.height;
2519         update_var(vc->vc_num, info);
2520         if (!scrollback_current)
2521                 fbcon_cursor(vc, CM_DRAW);
2522         return 0;
2523 }
2524
2525 static int fbcon_set_origin(struct vc_data *vc)
2526 {
2527         if (softback_lines)
2528                 fbcon_scrolldelta(vc, softback_lines);
2529         return 0;
2530 }
2531
2532 static void fbcon_suspended(struct fb_info *info)
2533 {
2534         struct vc_data *vc = NULL;
2535         struct fbcon_ops *ops = info->fbcon_par;
2536
2537         if (!ops || ops->currcon < 0)
2538                 return;
2539         vc = vc_cons[ops->currcon].d;
2540
2541         /* Clear cursor, restore saved data */
2542         fbcon_cursor(vc, CM_ERASE);
2543 }
2544
2545 static void fbcon_resumed(struct fb_info *info)
2546 {
2547         struct vc_data *vc;
2548         struct fbcon_ops *ops = info->fbcon_par;
2549
2550         if (!ops || ops->currcon < 0)
2551                 return;
2552         vc = vc_cons[ops->currcon].d;
2553
2554         update_screen(vc);
2555 }
2556
2557 static void fbcon_modechanged(struct fb_info *info)
2558 {
2559         struct fbcon_ops *ops = info->fbcon_par;
2560         struct vc_data *vc;
2561         struct display *p;
2562         int rows, cols;
2563
2564         if (!ops || ops->currcon < 0)
2565                 return;
2566         vc = vc_cons[ops->currcon].d;
2567         if (vc->vc_mode != KD_TEXT || registered_fb[con2fb_map[ops->currcon]] != info)
2568                 return;
2569
2570         p = &fb_display[vc->vc_num];
2571
2572         info->var.xoffset = info->var.yoffset = p->yscroll = 0;
2573
2574         if (CON_IS_VISIBLE(vc)) {
2575                 var_to_display(p, &info->var, info);
2576                 cols = info->var.xres / vc->vc_font.width;
2577                 rows = info->var.yres / vc->vc_font.height;
2578                 vc_resize(vc, cols, rows);
2579                 updatescrollmode(p, info, vc);
2580                 scrollback_max = 0;
2581                 scrollback_current = 0;
2582                 update_var(vc->vc_num, info);
2583                 fbcon_set_palette(vc, color_table);
2584                 update_screen(vc);
2585                 if (softback_buf) {
2586                         int l = fbcon_softback_size / vc->vc_size_row;
2587                         if (l > 5)
2588                                 softback_end = softback_buf + l * vc->vc_size_row;
2589                         else {
2590                                 /* Smaller scrollback makes no sense, and 0
2591                                    would screw the operation totally */
2592                                 softback_top = 0;
2593                         }
2594                 }
2595         }
2596 }
2597
2598 static int fbcon_mode_deleted(struct fb_info *info,
2599                               struct fb_videomode *mode)
2600 {
2601         struct fb_info *fb_info;
2602         struct display *p;
2603         int i, j, found = 0;
2604
2605         /* before deletion, ensure that mode is not in use */
2606         for (i = first_fb_vc; i <= last_fb_vc; i++) {
2607                 j = con2fb_map[i];
2608                 if (j == -1)
2609                         continue;
2610                 fb_info = registered_fb[j];
2611                 if (fb_info != info)
2612                         continue;
2613                 p = &fb_display[i];
2614                 if (!p || !p->mode)
2615                         continue;
2616                 if (fb_mode_is_equal(p->mode, mode)) {
2617                         found = 1;
2618                         break;
2619                 }
2620         }
2621         return found;
2622 }
2623
2624 static int fbcon_fb_registered(int idx)
2625 {
2626         int ret = 0, i;
2627
2628         if (info_idx == -1) {
2629                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2630                         if (con2fb_map_boot[i] == idx) {
2631                                 info_idx = idx;
2632                                 break;
2633                         }
2634                 }
2635                 if (info_idx != -1)
2636                         ret = fbcon_takeover(1);
2637         } else {
2638                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2639                         if (con2fb_map_boot[i] == idx)
2640                                 set_con2fb_map(i, idx, 0);
2641                 }
2642         }
2643
2644         return ret;
2645 }
2646
2647 static void fbcon_fb_blanked(struct fb_info *info, int blank)
2648 {
2649         struct fbcon_ops *ops = info->fbcon_par;
2650         struct vc_data *vc;
2651
2652         if (!ops || ops->currcon < 0)
2653                 return;
2654
2655         vc = vc_cons[ops->currcon].d;
2656         if (vc->vc_mode != KD_TEXT ||
2657                         registered_fb[con2fb_map[ops->currcon]] != info)
2658                 return;
2659
2660         if (CON_IS_VISIBLE(vc)) {
2661                 if (blank)
2662                         do_blank_screen(0);
2663                 else
2664                         do_unblank_screen(0);
2665         }
2666         ops->blank_state = blank;
2667 }
2668
2669 static void fbcon_new_modelist(struct fb_info *info)
2670 {
2671         int i;
2672         struct vc_data *vc;
2673         struct fb_var_screeninfo var;
2674         struct fb_videomode *mode;
2675
2676         for (i = 0; i < MAX_NR_CONSOLES; i++) {
2677                 if (registered_fb[con2fb_map[i]] != info)
2678                         continue;
2679                 if (!fb_display[i].mode)
2680                         continue;
2681                 vc = vc_cons[i].d;
2682                 display_to_var(&var, &fb_display[i]);
2683                 mode = fb_find_nearest_mode(&var, &info->modelist);
2684                 fb_videomode_to_var(&var, mode);
2685
2686                 if (vc)
2687                         fbcon_set_disp(info, &var, vc);
2688                 else
2689                         fbcon_preset_disp(info, &var, i);
2690
2691         }
2692 }
2693
2694 static int fbcon_event_notify(struct notifier_block *self,
2695                               unsigned long action, void *data)
2696 {
2697         struct fb_event *event = data;
2698         struct fb_info *info = event->info;
2699         struct fb_videomode *mode;
2700         struct fb_con2fbmap *con2fb;
2701         int ret = 0;
2702
2703         switch(action) {
2704         case FB_EVENT_SUSPEND:
2705                 fbcon_suspended(info);
2706                 break;
2707         case FB_EVENT_RESUME:
2708                 fbcon_resumed(info);
2709                 break;
2710         case FB_EVENT_MODE_CHANGE:
2711                 fbcon_modechanged(info);
2712                 break;
2713         case FB_EVENT_MODE_DELETE:
2714                 mode = event->data;
2715                 ret = fbcon_mode_deleted(info, mode);
2716                 break;
2717         case FB_EVENT_FB_REGISTERED:
2718                 ret = fbcon_fb_registered(info->node);
2719                 break;
2720         case FB_EVENT_SET_CONSOLE_MAP:
2721                 con2fb = event->data;
2722                 ret = set_con2fb_map(con2fb->console - 1,
2723                                      con2fb->framebuffer, 1);
2724                 break;
2725         case FB_EVENT_GET_CONSOLE_MAP:
2726                 con2fb = event->data;
2727                 con2fb->framebuffer = con2fb_map[con2fb->console - 1];
2728                 break;
2729         case FB_EVENT_BLANK:
2730                 fbcon_fb_blanked(info, *(int *)event->data);
2731                 break;
2732         case FB_EVENT_NEW_MODELIST:
2733                 fbcon_new_modelist(info);
2734                 break;
2735         }
2736
2737         return ret;
2738 }
2739
2740 /*
2741  *  The console `switch' structure for the frame buffer based console
2742  */
2743
2744 static const struct consw fb_con = {
2745         .owner                  = THIS_MODULE,
2746         .con_startup            = fbcon_startup,
2747         .con_init               = fbcon_init,
2748         .con_deinit             = fbcon_deinit,
2749         .con_clear              = fbcon_clear,
2750         .con_putc               = fbcon_putc,
2751         .con_putcs              = fbcon_putcs,
2752         .con_cursor             = fbcon_cursor,
2753         .con_scroll             = fbcon_scroll,
2754         .con_bmove              = fbcon_bmove,
2755         .con_switch             = fbcon_switch,
2756         .con_blank              = fbcon_blank,
2757         .con_font_set           = fbcon_set_font,
2758         .con_font_get           = fbcon_get_font,
2759         .con_font_default       = fbcon_set_def_font,
2760         .con_font_copy          = fbcon_copy_font,
2761         .con_set_palette        = fbcon_set_palette,
2762         .con_scrolldelta        = fbcon_scrolldelta,
2763         .con_set_origin         = fbcon_set_origin,
2764         .con_invert_region      = fbcon_invert_region,
2765         .con_screen_pos         = fbcon_screen_pos,
2766         .con_getxy              = fbcon_getxy,
2767         .con_resize             = fbcon_resize,
2768 };
2769
2770 static struct notifier_block fbcon_event_notifier = {
2771         .notifier_call  = fbcon_event_notify,
2772 };
2773
2774 static int __init fb_console_init(void)
2775 {
2776         int i;
2777
2778         acquire_console_sem();
2779         fb_register_client(&fbcon_event_notifier);
2780         release_console_sem();
2781
2782         for (i = 0; i < MAX_NR_CONSOLES; i++)
2783                 con2fb_map[i] = -1;
2784
2785         if (num_registered_fb) {
2786                 for (i = 0; i < FB_MAX; i++) {
2787                         if (registered_fb[i] != NULL) {
2788                                 info_idx = i;
2789                                 break;
2790                         }
2791                 }
2792                 fbcon_takeover(0);
2793         }
2794
2795         return 0;
2796 }
2797
2798 module_init(fb_console_init);
2799
2800 #ifdef MODULE
2801
2802 static void __exit fb_console_exit(void)
2803 {
2804         acquire_console_sem();
2805         fb_unregister_client(&fbcon_event_notifier);
2806         release_console_sem();
2807         give_up_console(&fb_con);
2808 }
2809
2810 module_exit(fb_console_exit);
2811
2812 #endif
2813
2814 MODULE_LICENSE("GPL");