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fbcon.c

/*
 *  linux/drivers/video/fbcon.c -- Low level frame buffer based console driver
 *
 *    Copyright (C) 1995 Geert Uytterhoeven
 *
 *
 *  This file is based on the original Amiga console driver (amicon.c):
 *
 *    Copyright (C) 1993 Hamish Macdonald
 *                   Greg Harp
 *    Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
 *
 *          with work by William Rucklidge (wjr@cs.cornell.edu)
 *                   Geert Uytterhoeven
 *                   Jes Sorensen (jds@kom.auc.dk)
 *                   Martin Apel
 *
 *  and on the original Atari console driver (atacon.c):
 *
 *    Copyright (C) 1993 Bjoern Brauel
 *                   Roman Hodek
 *
 *          with work by Guenther Kelleter
 *                   Martin Schaller
 *                   Andreas Schwab
 *
 *  Hardware cursor support added by Emmanuel Marty (core@ggi-project.org)
 *  Smart redraw scrolling, arbitrary font width support, 512char font support
 *  and software scrollback added by 
 *                         Jakub Jelinek (jj@ultra.linux.cz)
 *
 *  Random hacking by Martin Mares <mj@ucw.cz>
 *
 *    2001 - Documented with DocBook
 *    - Brad Douglas <brad@neruo.com>
 *
 *  The low level operations for the various display memory organizations are
 *  now in separate source files.
 *
 *  Currently the following organizations are supported:
 *
 *    o afb             Amiga bitplanes
 *    o cfb{2,4,8,16,24,32}   Packed pixels
 *    o ilbm                  Amiga interleaved bitplanes
 *    o iplan2p[248]          Atari interleaved bitplanes
 *    o mfb             Monochrome
 *    o vga             VGA characters/attributes
 *
 *  To do:
 *
 *    - Implement 16 plane mode (iplan2p16)
 *
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

#undef FBCONDEBUG

#include <linux/module.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/delay.h>      /* MSch: for IRQ probe */
#include <linux/console.h>
#include <linux/string.h>
#include <linux/kd.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/font.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/crc32.h> /* For counting font checksums */
#include <asm/fb.h>
#include <asm/irq.h>
#include <asm/system.h>
#ifdef CONFIG_ATARI
#include <asm/atariints.h>
#endif
#ifdef CONFIG_MAC
#include <asm/macints.h>
#endif
#if defined(__mc68000__) || defined(CONFIG_APUS)
#include <asm/machdep.h>
#include <asm/setup.h>
#endif

#include "fbcon.h"

#ifdef FBCONDEBUG
#  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
#else
#  define DPRINTK(fmt, args...)
#endif

enum {
      FBCON_LOGO_CANSHOW      = -1, /* the logo can be shown */
      FBCON_LOGO_DRAW         = -2, /* draw the logo to a console */
      FBCON_LOGO_DONTSHOW     = -3  /* do not show the logo */
};

static struct display fb_display[MAX_NR_CONSOLES];

static signed char con2fb_map[MAX_NR_CONSOLES];
static signed char con2fb_map_boot[MAX_NR_CONSOLES];
#ifndef MODULE
static int logo_height;
#endif
static int logo_lines;
/* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
   enums.  */
static int logo_shown = FBCON_LOGO_CANSHOW;
/* Software scrollback */
static int fbcon_softback_size = 32768;
static unsigned long softback_buf, softback_curr;
static unsigned long softback_in;
static unsigned long softback_top, softback_end;
static int softback_lines;
/* console mappings */
static int first_fb_vc;
static int last_fb_vc = MAX_NR_CONSOLES - 1;
static int fbcon_is_default = 1; 
static int fbcon_has_exited;
static int primary_device = -1;

#ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
static int map_override;

static inline void fbcon_map_override(void)
{
      map_override = 1;
}
#else
static inline void fbcon_map_override(void)
{
}
#endif /* CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY */

/* font data */
static char fontname[40];

/* current fb_info */
static int info_idx = -1;

/* console rotation */
static int rotate;
static int fbcon_has_sysfs;

static const struct consw fb_con;

#define CM_SOFTBACK     (8)

#define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)

static int fbcon_set_origin(struct vc_data *);

#define CURSOR_DRAW_DELAY           (1)

/* # VBL ints between cursor state changes */
#define ATARI_CURSOR_BLINK_RATE           (42)
#define MAC_CURSOR_BLINK_RATE       (32)
#define DEFAULT_CURSOR_BLINK_RATE   (20)

static int vbl_cursor_cnt;
static int fbcon_cursor_noblink;

#define divides(a, b)   ((!(a) || (b)%(a)) ? 0 : 1)

/*
 *  Interface used by the world
 */

static const char *fbcon_startup(void);
static void fbcon_init(struct vc_data *vc, int init);
static void fbcon_deinit(struct vc_data *vc);
static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
                  int width);
static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos);
static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
                  int count, int ypos, int xpos);
static void fbcon_clear_margins(struct vc_data *vc, int bottom_only);
static void fbcon_cursor(struct vc_data *vc, int mode);
static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
                  int count);
static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
                  int height, int width);
static int fbcon_switch(struct vc_data *vc);
static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch);
static int fbcon_set_palette(struct vc_data *vc, unsigned char *table);
static int fbcon_scrolldelta(struct vc_data *vc, int lines);

/*
 *  Internal routines
 */
static __inline__ void ywrap_up(struct vc_data *vc, int count);
static __inline__ void ywrap_down(struct vc_data *vc, int count);
static __inline__ void ypan_up(struct vc_data *vc, int count);
static __inline__ void ypan_down(struct vc_data *vc, int count);
static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx,
                      int dy, int dx, int height, int width, u_int y_break);
static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
                     int unit);
static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
                        int line, int count, int dy);
static void fbcon_modechanged(struct fb_info *info);
static void fbcon_set_all_vcs(struct fb_info *info);
static void fbcon_start(void);
static void fbcon_exit(void);
static struct device *fbcon_device;

#ifdef CONFIG_MAC
/*
 * On the Macintoy, there may or may not be a working VBL int. We need to probe
 */
static int vbl_detected;

static irqreturn_t fb_vbl_detect(int irq, void *dummy)
{
      vbl_detected++;
      return IRQ_HANDLED;
}
#endif

#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
static inline void fbcon_set_rotation(struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;

      if (!(info->flags & FBINFO_MISC_TILEBLITTING) &&
          ops->p->con_rotate < 4)
            ops->rotate = ops->p->con_rotate;
      else
            ops->rotate = 0;
}

static void fbcon_rotate(struct fb_info *info, u32 rotate)
{
      struct fbcon_ops *ops= info->fbcon_par;
      struct fb_info *fb_info;

      if (!ops || ops->currcon == -1)
            return;

      fb_info = registered_fb[con2fb_map[ops->currcon]];

      if (info == fb_info) {
            struct display *p = &fb_display[ops->currcon];

            if (rotate < 4)
                  p->con_rotate = rotate;
            else
                  p->con_rotate = 0;

            fbcon_modechanged(info);
      }
}

static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
{
      struct fbcon_ops *ops = info->fbcon_par;
      struct vc_data *vc;
      struct display *p;
      int i;

      if (!ops || ops->currcon < 0 || rotate > 3)
            return;

      for (i = first_fb_vc; i <= last_fb_vc; i++) {
            vc = vc_cons[i].d;
            if (!vc || vc->vc_mode != KD_TEXT ||
                registered_fb[con2fb_map[i]] != info)
                  continue;

            p = &fb_display[vc->vc_num];
            p->con_rotate = rotate;
      }

      fbcon_set_all_vcs(info);
}
#else
static inline void fbcon_set_rotation(struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;

      ops->rotate = FB_ROTATE_UR;
}

static void fbcon_rotate(struct fb_info *info, u32 rotate)
{
      return;
}

static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
{
      return;
}
#endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */

static int fbcon_get_rotate(struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;

      return (ops) ? ops->rotate : 0;
}

static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;

      return (info->state != FBINFO_STATE_RUNNING ||
            vc->vc_mode != KD_TEXT || ops->graphics);
}

static inline int get_color(struct vc_data *vc, struct fb_info *info,
            u16 c, int is_fg)
{
      int depth = fb_get_color_depth(&info->var, &info->fix);
      int color = 0;

      if (console_blanked) {
            unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;

            c = vc->vc_video_erase_char & charmask;
      }

      if (depth != 1)
            color = (is_fg) ? attr_fgcol((vc->vc_hi_font_mask) ? 9 : 8, c)
                  : attr_bgcol((vc->vc_hi_font_mask) ? 13 : 12, c);

      switch (depth) {
      case 1:
      {
            int col = ~(0xfff << (max(info->var.green.length,
                                max(info->var.red.length,
                                    info->var.blue.length)))) & 0xff;

            /* 0 or 1 */
            int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
            int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;

            if (console_blanked)
                  fg = bg;

            color = (is_fg) ? fg : bg;
            break;
      }
      case 2:
            /*
             * Scale down 16-colors to 4 colors. Default 4-color palette
             * is grayscale. However, simply dividing the values by 4
             * will not work, as colors 1, 2 and 3 will be scaled-down
             * to zero rendering them invisible.  So empirically convert
             * colors to a sane 4-level grayscale.
             */
            switch (color) {
            case 0:
                  color = 0; /* black */
                  break;
            case 1 ... 6:
                  color = 2; /* white */
                  break;
            case 7 ... 8:
                  color = 1; /* gray */
                  break;
            default:
                  color = 3; /* intense white */
                  break;
            }
            break;
      case 3:
            /*
             * Last 8 entries of default 16-color palette is a more intense
             * version of the first 8 (i.e., same chrominance, different
             * luminance).
             */
            color &= 7;
            break;
      }


      return color;
}

static void fbcon_update_softback(struct vc_data *vc)
{
      int l = fbcon_softback_size / vc->vc_size_row;

      if (l > 5)
            softback_end = softback_buf + l * vc->vc_size_row;
      else
            /* Smaller scrollback makes no sense, and 0 would screw
               the operation totally */
            softback_top = 0;
}

static void fb_flashcursor(struct work_struct *work)
{
      struct fb_info *info = container_of(work, struct fb_info, queue);
      struct fbcon_ops *ops = info->fbcon_par;
      struct display *p;
      struct vc_data *vc = NULL;
      int c;
      int mode;

      acquire_console_sem();
      if (ops && ops->currcon != -1)
            vc = vc_cons[ops->currcon].d;

      if (!vc || !CON_IS_VISIBLE(vc) ||
          registered_fb[con2fb_map[vc->vc_num]] != info ||
          vc->vc_deccm != 1) {
            release_console_sem();
            return;
      }

      p = &fb_display[vc->vc_num];
      c = scr_readw((u16 *) vc->vc_pos);
      mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
            CM_ERASE : CM_DRAW;
      ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
                get_color(vc, info, c, 0));
      release_console_sem();
}

#if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
static int cursor_blink_rate;
static irqreturn_t fb_vbl_handler(int irq, void *dev_id)
{
      struct fb_info *info = dev_id;

      if (vbl_cursor_cnt && --vbl_cursor_cnt == 0) {
            schedule_work(&info->queue);  
            vbl_cursor_cnt = cursor_blink_rate; 
      }
      return IRQ_HANDLED;
}
#endif
      
static void cursor_timer_handler(unsigned long dev_addr)
{
      struct fb_info *info = (struct fb_info *) dev_addr;
      struct fbcon_ops *ops = info->fbcon_par;

      schedule_work(&info->queue);
      mod_timer(&ops->cursor_timer, jiffies + HZ/5);
}

static void fbcon_add_cursor_timer(struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;

      if ((!info->queue.func || info->queue.func == fb_flashcursor) &&
          !(ops->flags & FBCON_FLAGS_CURSOR_TIMER) &&
          !fbcon_cursor_noblink) {
            if (!info->queue.func)
                  INIT_WORK(&info->queue, fb_flashcursor);

            init_timer(&ops->cursor_timer);
            ops->cursor_timer.function = cursor_timer_handler;
            ops->cursor_timer.expires = jiffies + HZ / 5;
            ops->cursor_timer.data = (unsigned long ) info;
            add_timer(&ops->cursor_timer);
            ops->flags |= FBCON_FLAGS_CURSOR_TIMER;
      }
}

static void fbcon_del_cursor_timer(struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;

      if (info->queue.func == fb_flashcursor &&
          ops->flags & FBCON_FLAGS_CURSOR_TIMER) {
            del_timer_sync(&ops->cursor_timer);
            ops->flags &= ~FBCON_FLAGS_CURSOR_TIMER;
      }
}

#ifndef MODULE
static int __init fb_console_setup(char *this_opt)
{
      char *options;
      int i, j;

      if (!this_opt || !*this_opt)
            return 1;

      while ((options = strsep(&this_opt, ",")) != NULL) {
            if (!strncmp(options, "font:", 5))
                  strcpy(fontname, options + 5);
            
            if (!strncmp(options, "scrollback:", 11)) {
                  options += 11;
                  if (*options) {
                        fbcon_softback_size = simple_strtoul(options, &options, 0);
                        if (*options == 'k' || *options == 'K') {
                              fbcon_softback_size *= 1024;
                              options++;
                        }
                        if (*options != ',')
                              return 1;
                        options++;
                  } else
                        return 1;
            }
            
            if (!strncmp(options, "map:", 4)) {
                  options += 4;
                  if (*options) {
                        for (i = 0, j = 0; i < MAX_NR_CONSOLES; i++) {
                              if (!options[j])
                                    j = 0;
                              con2fb_map_boot[i] =
                                    (options[j++]-'0') % FB_MAX;
                        }

                        fbcon_map_override();
                  }

                  return 1;
            }

            if (!strncmp(options, "vc:", 3)) {
                  options += 3;
                  if (*options)
                        first_fb_vc = simple_strtoul(options, &options, 10) - 1;
                  if (first_fb_vc < 0)
                        first_fb_vc = 0;
                  if (*options++ == '-')
                        last_fb_vc = simple_strtoul(options, &options, 10) - 1;
                  fbcon_is_default = 0; 
            }     

            if (!strncmp(options, "rotate:", 7)) {
                  options += 7;
                  if (*options)
                        rotate = simple_strtoul(options, &options, 0);
                  if (rotate > 3)
                        rotate = 0;
            }
      }
      return 1;
}

__setup("fbcon=", fb_console_setup);
#endif

static int search_fb_in_map(int idx)
{
      int i, retval = 0;

      for (i = first_fb_vc; i <= last_fb_vc; i++) {
            if (con2fb_map[i] == idx)
                  retval = 1;
      }
      return retval;
}

static int search_for_mapped_con(void)
{
      int i, retval = 0;

      for (i = first_fb_vc; i <= last_fb_vc; i++) {
            if (con2fb_map[i] != -1)
                  retval = 1;
      }
      return retval;
}

static int fbcon_takeover(int show_logo)
{
      int err, i;

      if (!num_registered_fb)
            return -ENODEV;

      if (!show_logo)
            logo_shown = FBCON_LOGO_DONTSHOW;

      for (i = first_fb_vc; i <= last_fb_vc; i++)
            con2fb_map[i] = info_idx;

      err = take_over_console(&fb_con, first_fb_vc, last_fb_vc,
                        fbcon_is_default);

      if (err) {
            for (i = first_fb_vc; i <= last_fb_vc; i++) {
                  con2fb_map[i] = -1;
            }
            info_idx = -1;
      }

      return err;
}

#ifdef MODULE
static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
                         int cols, int rows, int new_cols, int new_rows)
{
      logo_shown = FBCON_LOGO_DONTSHOW;
}
#else
static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
                         int cols, int rows, int new_cols, int new_rows)
{
      /* Need to make room for the logo */
      struct fbcon_ops *ops = info->fbcon_par;
      int cnt, erase = vc->vc_video_erase_char, step;
      unsigned short *save = NULL, *r, *q;

      if (info->flags & FBINFO_MODULE) {
            logo_shown = FBCON_LOGO_DONTSHOW;
            return;
      }

      /*
       * remove underline attribute from erase character
       * if black and white framebuffer.
       */
      if (fb_get_color_depth(&info->var, &info->fix) == 1)
            erase &= ~0x400;
      logo_height = fb_prepare_logo(info, ops->rotate);
      logo_lines = (logo_height + vc->vc_font.height - 1) /
            vc->vc_font.height;
      q = (unsigned short *) (vc->vc_origin +
                        vc->vc_size_row * rows);
      step = logo_lines * cols;
      for (r = q - logo_lines * cols; r < q; r++)
            if (scr_readw(r) != vc->vc_video_erase_char)
                  break;
      if (r != q && new_rows >= rows + logo_lines) {
            save = kmalloc(logo_lines * new_cols * 2, GFP_KERNEL);
            if (save) {
                  int i = cols < new_cols ? cols : new_cols;
                  scr_memsetw(save, erase, logo_lines * new_cols * 2);
                  r = q - step;
                  for (cnt = 0; cnt < logo_lines; cnt++, r += i)
                        scr_memcpyw(save + cnt * new_cols, r, 2 * i);
                  r = q;
            }
      }
      if (r == q) {
            /* We can scroll screen down */
            r = q - step - cols;
            for (cnt = rows - logo_lines; cnt > 0; cnt--) {
                  scr_memcpyw(r + step, r, vc->vc_size_row);
                  r -= cols;
            }
            if (!save) {
                  int lines;
                  if (vc->vc_y + logo_lines >= rows)
                        lines = rows - vc->vc_y - 1;
                  else
                        lines = logo_lines;
                  vc->vc_y += lines;
                  vc->vc_pos += lines * vc->vc_size_row;
            }
      }
      scr_memsetw((unsigned short *) vc->vc_origin,
                erase,
                vc->vc_size_row * logo_lines);

      if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
            fbcon_clear_margins(vc, 0);
            update_screen(vc);
      }

      if (save) {
            q = (unsigned short *) (vc->vc_origin +
                              vc->vc_size_row *
                              rows);
            scr_memcpyw(q, save, logo_lines * new_cols * 2);
            vc->vc_y += logo_lines;
            vc->vc_pos += logo_lines * vc->vc_size_row;
            kfree(save);
      }

      if (logo_lines > vc->vc_bottom) {
            logo_shown = FBCON_LOGO_CANSHOW;
            printk(KERN_INFO
                   "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
      } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
            logo_shown = FBCON_LOGO_DRAW;
            vc->vc_top = logo_lines;
      }
}
#endif /* MODULE */

#ifdef CONFIG_FB_TILEBLITTING
static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;

      ops->p = &fb_display[vc->vc_num];

      if ((info->flags & FBINFO_MISC_TILEBLITTING))
            fbcon_set_tileops(vc, info);
      else {
            fbcon_set_rotation(info);
            fbcon_set_bitops(ops);
      }
}

static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
{
      int err = 0;

      if (info->flags & FBINFO_MISC_TILEBLITTING &&
          info->tileops->fb_get_tilemax(info) < charcount)
            err = 1;

      return err;
}
#else
static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;

      info->flags &= ~FBINFO_MISC_TILEBLITTING;
      ops->p = &fb_display[vc->vc_num];
      fbcon_set_rotation(info);
      fbcon_set_bitops(ops);
}

static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
{
      return 0;
}

#endif /* CONFIG_MISC_TILEBLITTING */


static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
                          int unit, int oldidx)
{
      struct fbcon_ops *ops = NULL;
      int err = 0;

      if (!try_module_get(info->fbops->owner))
            err = -ENODEV;

      if (!err && info->fbops->fb_open &&
          info->fbops->fb_open(info, 0))
            err = -ENODEV;

      if (!err) {
            ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
            if (!ops)
                  err = -ENOMEM;
      }

      if (!err) {
            info->fbcon_par = ops;

            if (vc)
                  set_blitting_type(vc, info);
      }

      if (err) {
            con2fb_map[unit] = oldidx;
            module_put(info->fbops->owner);
      }

      return err;
}

static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
                          struct fb_info *newinfo, int unit,
                          int oldidx, int found)
{
      struct fbcon_ops *ops = oldinfo->fbcon_par;
      int err = 0;

      if (oldinfo->fbops->fb_release &&
          oldinfo->fbops->fb_release(oldinfo, 0)) {
            con2fb_map[unit] = oldidx;
            if (!found && newinfo->fbops->fb_release)
                  newinfo->fbops->fb_release(newinfo, 0);
            if (!found)
                  module_put(newinfo->fbops->owner);
            err = -ENODEV;
      }

      if (!err) {
            fbcon_del_cursor_timer(oldinfo);
            kfree(ops->cursor_state.mask);
            kfree(ops->cursor_data);
            kfree(ops->fontbuffer);
            kfree(oldinfo->fbcon_par);
            oldinfo->fbcon_par = NULL;
            module_put(oldinfo->fbops->owner);
            /*
              If oldinfo and newinfo are driving the same hardware,
              the fb_release() method of oldinfo may attempt to
              restore the hardware state.  This will leave the
              newinfo in an undefined state. Thus, a call to
              fb_set_par() may be needed for the newinfo.
            */
            if (newinfo->fbops->fb_set_par)
                  newinfo->fbops->fb_set_par(newinfo);
      }

      return err;
}

static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
                        int unit, int show_logo)
{
      struct fbcon_ops *ops = info->fbcon_par;

      ops->currcon = fg_console;

      if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT))
            info->fbops->fb_set_par(info);

      ops->flags |= FBCON_FLAGS_INIT;
      ops->graphics = 0;
      fbcon_set_disp(info, &info->var, unit);

      if (show_logo) {
            struct vc_data *fg_vc = vc_cons[fg_console].d;
            struct fb_info *fg_info =
                  registered_fb[con2fb_map[fg_console]];

            fbcon_prepare_logo(fg_vc, fg_info, fg_vc->vc_cols,
                           fg_vc->vc_rows, fg_vc->vc_cols,
                           fg_vc->vc_rows);
      }

      update_screen(vc_cons[fg_console].d);
}

/**
 *    set_con2fb_map - map console to frame buffer device
 *    @unit: virtual console number to map
 *    @newidx: frame buffer index to map virtual console to
 *      @user: user request
 *
 *    Maps a virtual console @unit to a frame buffer device
 *    @newidx.
 */
static int set_con2fb_map(int unit, int newidx, int user)
{
      struct vc_data *vc = vc_cons[unit].d;
      int oldidx = con2fb_map[unit];
      struct fb_info *info = registered_fb[newidx];
      struct fb_info *oldinfo = NULL;
      int found, err = 0;

      if (oldidx == newidx)
            return 0;

      if (!info || fbcon_has_exited)
            return -EINVAL;

      if (!err && !search_for_mapped_con()) {
            info_idx = newidx;
            return fbcon_takeover(0);
      }

      if (oldidx != -1)
            oldinfo = registered_fb[oldidx];

      found = search_fb_in_map(newidx);

      acquire_console_sem();
      con2fb_map[unit] = newidx;
      if (!err && !found)
            err = con2fb_acquire_newinfo(vc, info, unit, oldidx);


      /*
       * If old fb is not mapped to any of the consoles,
       * fbcon should release it.
       */
      if (!err && oldinfo && !search_fb_in_map(oldidx))
            err = con2fb_release_oldinfo(vc, oldinfo, info, unit, oldidx,
                                   found);

      if (!err) {
            int show_logo = (fg_console == 0 && !user &&
                         logo_shown != FBCON_LOGO_DONTSHOW);

            if (!found)
                  fbcon_add_cursor_timer(info);
            con2fb_map_boot[unit] = newidx;
            con2fb_init_display(vc, info, unit, show_logo);
      }

      if (!search_fb_in_map(info_idx))
            info_idx = newidx;

      release_console_sem();
      return err;
}

/*
 *  Low Level Operations
 */
/* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
static int var_to_display(struct display *disp,
                    struct fb_var_screeninfo *var,
                    struct fb_info *info)
{
      disp->xres_virtual = var->xres_virtual;
      disp->yres_virtual = var->yres_virtual;
      disp->bits_per_pixel = var->bits_per_pixel;
      disp->grayscale = var->grayscale;
      disp->nonstd = var->nonstd;
      disp->accel_flags = var->accel_flags;
      disp->height = var->height;
      disp->width = var->width;
      disp->red = var->red;
      disp->green = var->green;
      disp->blue = var->blue;
      disp->transp = var->transp;
      disp->rotate = var->rotate;
      disp->mode = fb_match_mode(var, &info->modelist);
      if (disp->mode == NULL)
            /* This should not happen */
            return -EINVAL;
      return 0;
}

static void display_to_var(struct fb_var_screeninfo *var,
                     struct display *disp)
{
      fb_videomode_to_var(var, disp->mode);
      var->xres_virtual = disp->xres_virtual;
      var->yres_virtual = disp->yres_virtual;
      var->bits_per_pixel = disp->bits_per_pixel;
      var->grayscale = disp->grayscale;
      var->nonstd = disp->nonstd;
      var->accel_flags = disp->accel_flags;
      var->height = disp->height;
      var->width = disp->width;
      var->red = disp->red;
      var->green = disp->green;
      var->blue = disp->blue;
      var->transp = disp->transp;
      var->rotate = disp->rotate;
}

static const char *fbcon_startup(void)
{
      const char *display_desc = "frame buffer device";
      struct display *p = &fb_display[fg_console];
      struct vc_data *vc = vc_cons[fg_console].d;
      const struct font_desc *font = NULL;
      struct module *owner;
      struct fb_info *info = NULL;
      struct fbcon_ops *ops;
      int rows, cols;
      int irqres;

      irqres = 1;
      /*
       *  If num_registered_fb is zero, this is a call for the dummy part.
       *  The frame buffer devices weren't initialized yet.
       */
      if (!num_registered_fb || info_idx == -1)
            return display_desc;
      /*
       * Instead of blindly using registered_fb[0], we use info_idx, set by
       * fb_console_init();
       */
      info = registered_fb[info_idx];
      if (!info)
            return NULL;
      
      owner = info->fbops->owner;
      if (!try_module_get(owner))
            return NULL;
      if (info->fbops->fb_open && info->fbops->fb_open(info, 0)) {
            module_put(owner);
            return NULL;
      }

      ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
      if (!ops) {
            module_put(owner);
            return NULL;
      }

      ops->currcon = -1;
      ops->graphics = 1;
      ops->cur_rotate = -1;
      info->fbcon_par = ops;
      p->con_rotate = rotate;
      set_blitting_type(vc, info);

      if (info->fix.type != FB_TYPE_TEXT) {
            if (fbcon_softback_size) {
                  if (!softback_buf) {
                        softback_buf =
                            (unsigned long)
                            kmalloc(fbcon_softback_size,
                                  GFP_KERNEL);
                        if (!softback_buf) {
                              fbcon_softback_size = 0;
                              softback_top = 0;
                        }
                  }
            } else {
                  if (softback_buf) {
                        kfree((void *) softback_buf);
                        softback_buf = 0;
                        softback_top = 0;
                  }
            }
            if (softback_buf)
                  softback_in = softback_top = softback_curr =
                      softback_buf;
            softback_lines = 0;
      }

      /* Setup default font */
      if (!p->fontdata) {
            if (!fontname[0] || !(font = find_font(fontname)))
                  font = get_default_font(info->var.xres,
                                    info->var.yres,
                                    info->pixmap.blit_x,
                                    info->pixmap.blit_y);
            vc->vc_font.width = font->width;
            vc->vc_font.height = font->height;
            vc->vc_font.data = (void *)(p->fontdata = font->data);
            vc->vc_font.charcount = 256; /* FIXME  Need to support more fonts */
      }

      cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
      rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
      cols /= vc->vc_font.width;
      rows /= vc->vc_font.height;
      vc_resize(vc, cols, rows);

      DPRINTK("mode:   %s\n", info->fix.id);
      DPRINTK("visual: %d\n", info->fix.visual);
      DPRINTK("res:    %dx%d-%d\n", info->var.xres,
            info->var.yres,
            info->var.bits_per_pixel);

#ifdef CONFIG_ATARI
      if (MACH_IS_ATARI) {
            cursor_blink_rate = ATARI_CURSOR_BLINK_RATE;
            irqres =
                request_irq(IRQ_AUTO_4, fb_vbl_handler,
                        IRQ_TYPE_PRIO, "framebuffer vbl",
                        info);
      }
#endif                        /* CONFIG_ATARI */

#ifdef CONFIG_MAC
      /*
       * On a Macintoy, the VBL interrupt may or may not be active. 
       * As interrupt based cursor is more reliable and race free, we 
       * probe for VBL interrupts.
       */
      if (MACH_IS_MAC) {
            int ct = 0;
            /*
             * Probe for VBL: set temp. handler ...
             */
            irqres = request_irq(IRQ_MAC_VBL, fb_vbl_detect, 0,
                             "framebuffer vbl", info);
            vbl_detected = 0;

            /*
             * ... and spin for 20 ms ...
             */
            while (!vbl_detected && ++ct < 1000)
                  udelay(20);

            if (ct == 1000)
                  printk
                      ("fbcon_startup: No VBL detected, using timer based cursor.\n");

            free_irq(IRQ_MAC_VBL, fb_vbl_detect);

            if (vbl_detected) {
                  /*
                   * interrupt based cursor ok
                   */
                  cursor_blink_rate = MAC_CURSOR_BLINK_RATE;
                  irqres =
                      request_irq(IRQ_MAC_VBL, fb_vbl_handler, 0,
                              "framebuffer vbl", info);
            } else {
                  /*
                   * VBL not detected: fall through, use timer based cursor
                   */
                  irqres = 1;
            }
      }
#endif                        /* CONFIG_MAC */

      fbcon_add_cursor_timer(info);
      fbcon_has_exited = 0;
      return display_desc;
}

static void fbcon_init(struct vc_data *vc, int init)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops;
      struct vc_data **default_mode = vc->vc_display_fg;
      struct vc_data *svc = *default_mode;
      struct display *t, *p = &fb_display[vc->vc_num];
      int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
      int cap;

      if (info_idx == -1 || info == NULL)
          return;

      cap = info->flags;

      if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
          (info->fix.type == FB_TYPE_TEXT))
            logo = 0;

      if (var_to_display(p, &info->var, info))
            return;

      if (!info->fbcon_par)
            con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);

      /* If we are not the first console on this
         fb, copy the font from that console */
      t = &fb_display[fg_console];
      if (!p->fontdata) {
            if (t->fontdata) {
                  struct vc_data *fvc = vc_cons[fg_console].d;

                  vc->vc_font.data = (void *)(p->fontdata =
                                        fvc->vc_font.data);
                  vc->vc_font.width = fvc->vc_font.width;
                  vc->vc_font.height = fvc->vc_font.height;
                  p->userfont = t->userfont;

                  if (p->userfont)
                        REFCOUNT(p->fontdata)++;
            } else {
                  const struct font_desc *font = NULL;

                  if (!fontname[0] || !(font = find_font(fontname)))
                        font = get_default_font(info->var.xres,
                                          info->var.yres,
                                          info->pixmap.blit_x,
                                          info->pixmap.blit_y);
                  vc->vc_font.width = font->width;
                  vc->vc_font.height = font->height;
                  vc->vc_font.data = (void *)(p->fontdata = font->data);
                  vc->vc_font.charcount = 256; /* FIXME  Need to
                                          support more fonts */
            }
      }

      if (p->userfont)
            charcnt = FNTCHARCNT(p->fontdata);

      vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
      vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
      if (charcnt == 256) {
            vc->vc_hi_font_mask = 0;
      } else {
            vc->vc_hi_font_mask = 0x100;
            if (vc->vc_can_do_color)
                  vc->vc_complement_mask <<= 1;
      }

      if (!*svc->vc_uni_pagedir_loc)
            con_set_default_unimap(svc);
      if (!*vc->vc_uni_pagedir_loc)
            con_copy_unimap(vc, svc);

      ops = info->fbcon_par;
      p->con_rotate = rotate;
      set_blitting_type(vc, info);

      cols = vc->vc_cols;
      rows = vc->vc_rows;
      new_cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
      new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
      new_cols /= vc->vc_font.width;
      new_rows /= vc->vc_font.height;
      vc_resize(vc, new_cols, new_rows);

      /*
       * We must always set the mode. The mode of the previous console
       * driver could be in the same resolution but we are using different
       * hardware so we have to initialize the hardware.
       *
       * We need to do it in fbcon_init() to prevent screen corruption.
       */
      if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) {
            if (info->fbops->fb_set_par &&
                !(ops->flags & FBCON_FLAGS_INIT))
                  info->fbops->fb_set_par(info);
            ops->flags |= FBCON_FLAGS_INIT;
      }

      ops->graphics = 0;

      if ((cap & FBINFO_HWACCEL_COPYAREA) &&
          !(cap & FBINFO_HWACCEL_DISABLED))
            p->scrollmode = SCROLL_MOVE;
      else /* default to something safe */
            p->scrollmode = SCROLL_REDRAW;

      /*
       *  ++guenther: console.c:vc_allocate() relies on initializing
       *  vc_{cols,rows}, but we must not set those if we are only
       *  resizing the console.
       */
      if (!init) {
            vc->vc_cols = new_cols;
            vc->vc_rows = new_rows;
      }

      if (logo)
            fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);

      if (vc == svc && softback_buf)
            fbcon_update_softback(vc);

      if (ops->rotate_font && ops->rotate_font(info, vc)) {
            ops->rotate = FB_ROTATE_UR;
            set_blitting_type(vc, info);
      }

      ops->p = &fb_display[fg_console];
}

static void fbcon_free_font(struct display *p)
{
      if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
            kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
      p->fontdata = NULL;
      p->userfont = 0;
}

static void fbcon_deinit(struct vc_data *vc)
{
      struct display *p = &fb_display[vc->vc_num];
      struct fb_info *info;
      struct fbcon_ops *ops;
      int idx;

      fbcon_free_font(p);
      idx = con2fb_map[vc->vc_num];

      if (idx == -1)
            goto finished;

      info = registered_fb[idx];

      if (!info)
            goto finished;

      ops = info->fbcon_par;

      if (!ops)
            goto finished;

      if (CON_IS_VISIBLE(vc))
            fbcon_del_cursor_timer(info);

      ops->flags &= ~FBCON_FLAGS_INIT;
finished:

      if (!con_is_bound(&fb_con))
            fbcon_exit();

      return;
}

/* ====================================================================== */

/*  fbcon_XXX routines - interface used by the world
 *
 *  This system is now divided into two levels because of complications
 *  caused by hardware scrolling. Top level functions:
 *
 *    fbcon_bmove(), fbcon_clear(), fbcon_putc(), fbcon_clear_margins()
 *
 *  handles y values in range [0, scr_height-1] that correspond to real
 *  screen positions. y_wrap shift means that first line of bitmap may be
 *  anywhere on this display. These functions convert lineoffsets to
 *  bitmap offsets and deal with the wrap-around case by splitting blits.
 *
 *    fbcon_bmove_physical_8()    -- These functions fast implementations
 *    fbcon_clear_physical_8()    -- of original fbcon_XXX fns.
 *    fbcon_putc_physical_8()     -- (font width != 8) may be added later
 *
 *  WARNING:
 *
 *  At the moment fbcon_putc() cannot blit across vertical wrap boundary
 *  Implies should only really hardware scroll in rows. Only reason for
 *  restriction is simplicity & efficiency at the moment.
 */

static void fbcon_clear(struct vc_data *vc, int sy, int sx, int height,
                  int width)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;

      struct display *p = &fb_display[vc->vc_num];
      u_int y_break;

      if (fbcon_is_inactive(vc, info))
            return;

      if (!height || !width)
            return;

      /* Split blits that cross physical y_wrap boundary */

      y_break = p->vrows - p->yscroll;
      if (sy < y_break && sy + height - 1 >= y_break) {
            u_int b = y_break - sy;
            ops->clear(vc, info, real_y(p, sy), sx, b, width);
            ops->clear(vc, info, real_y(p, sy + b), sx, height - b,
                         width);
      } else
            ops->clear(vc, info, real_y(p, sy), sx, height, width);
}

static void fbcon_putcs(struct vc_data *vc, const unsigned short *s,
                  int count, int ypos, int xpos)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct display *p = &fb_display[vc->vc_num];
      struct fbcon_ops *ops = info->fbcon_par;

      if (!fbcon_is_inactive(vc, info))
            ops->putcs(vc, info, s, count, real_y(p, ypos), xpos,
                     get_color(vc, info, scr_readw(s), 1),
                     get_color(vc, info, scr_readw(s), 0));
}

static void fbcon_putc(struct vc_data *vc, int c, int ypos, int xpos)
{
      unsigned short chr;

      scr_writew(c, &chr);
      fbcon_putcs(vc, &chr, 1, ypos, xpos);
}

static void fbcon_clear_margins(struct vc_data *vc, int bottom_only)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;

      if (!fbcon_is_inactive(vc, info))
            ops->clear_margins(vc, info, bottom_only);
}

static void fbcon_cursor(struct vc_data *vc, int mode)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;
      int y;
      int c = scr_readw((u16 *) vc->vc_pos);

      if (fbcon_is_inactive(vc, info) || vc->vc_deccm != 1)
            return;

      if (vc->vc_cursor_type & 0x10)
            fbcon_del_cursor_timer(info);
      else
            fbcon_add_cursor_timer(info);

      ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
      if (mode & CM_SOFTBACK) {
            mode &= ~CM_SOFTBACK;
            y = softback_lines;
      } else {
            if (softback_lines)
                  fbcon_set_origin(vc);
            y = 0;
      }

      ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
                get_color(vc, info, c, 0));
      vbl_cursor_cnt = CURSOR_DRAW_DELAY;
}

static int scrollback_phys_max = 0;
static int scrollback_max = 0;
static int scrollback_current = 0;

static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
                     int unit)
{
      struct display *p, *t;
      struct vc_data **default_mode, *vc;
      struct vc_data *svc;
      struct fbcon_ops *ops = info->fbcon_par;
      int rows, cols, charcnt = 256;

      p = &fb_display[unit];

      if (var_to_display(p, var, info))
            return;

      vc = vc_cons[unit].d;

      if (!vc)
            return;

      default_mode = vc->vc_display_fg;
      svc = *default_mode;
      t = &fb_display[svc->vc_num];

      if (!vc->vc_font.data) {
            vc->vc_font.data = (void *)(p->fontdata = t->fontdata);
            vc->vc_font.width = (*default_mode)->vc_font.width;
            vc->vc_font.height = (*default_mode)->vc_font.height;
            p->userfont = t->userfont;
            if (p->userfont)
                  REFCOUNT(p->fontdata)++;
      }
      if (p->userfont)
            charcnt = FNTCHARCNT(p->fontdata);

      var->activate = FB_ACTIVATE_NOW;
      info->var.activate = var->activate;
      var->yoffset = info->var.yoffset;
      var->xoffset = info->var.xoffset;
      fb_set_var(info, var);
      ops->var = info->var;
      vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
      vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
      if (charcnt == 256) {
            vc->vc_hi_font_mask = 0;
      } else {
            vc->vc_hi_font_mask = 0x100;
            if (vc->vc_can_do_color)
                  vc->vc_complement_mask <<= 1;
      }

      if (!*svc->vc_uni_pagedir_loc)
            con_set_default_unimap(svc);
      if (!*vc->vc_uni_pagedir_loc)
            con_copy_unimap(vc, svc);

      cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
      rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
      cols /= vc->vc_font.width;
      rows /= vc->vc_font.height;
      vc_resize(vc, cols, rows);

      if (CON_IS_VISIBLE(vc)) {
            update_screen(vc);
            if (softback_buf)
                  fbcon_update_softback(vc);
      }
}

static __inline__ void ywrap_up(struct vc_data *vc, int count)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;
      struct display *p = &fb_display[vc->vc_num];
      
      p->yscroll += count;
      if (p->yscroll >= p->vrows)   /* Deal with wrap */
            p->yscroll -= p->vrows;
      ops->var.xoffset = 0;
      ops->var.yoffset = p->yscroll * vc->vc_font.height;
      ops->var.vmode |= FB_VMODE_YWRAP;
      ops->update_start(info);
      scrollback_max += count;
      if (scrollback_max > scrollback_phys_max)
            scrollback_max = scrollback_phys_max;
      scrollback_current = 0;
}

static __inline__ void ywrap_down(struct vc_data *vc, int count)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;
      struct display *p = &fb_display[vc->vc_num];
      
      p->yscroll -= count;
      if (p->yscroll < 0)     /* Deal with wrap */
            p->yscroll += p->vrows;
      ops->var.xoffset = 0;
      ops->var.yoffset = p->yscroll * vc->vc_font.height;
      ops->var.vmode |= FB_VMODE_YWRAP;
      ops->update_start(info);
      scrollback_max -= count;
      if (scrollback_max < 0)
            scrollback_max = 0;
      scrollback_current = 0;
}

static __inline__ void ypan_up(struct vc_data *vc, int count)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct display *p = &fb_display[vc->vc_num];
      struct fbcon_ops *ops = info->fbcon_par;

      p->yscroll += count;
      if (p->yscroll > p->vrows - vc->vc_rows) {
            ops->bmove(vc, info, p->vrows - vc->vc_rows,
                      0, 0, 0, vc->vc_rows, vc->vc_cols);
            p->yscroll -= p->vrows - vc->vc_rows;
      }

      ops->var.xoffset = 0;
      ops->var.yoffset = p->yscroll * vc->vc_font.height;
      ops->var.vmode &= ~FB_VMODE_YWRAP;
      ops->update_start(info);
      fbcon_clear_margins(vc, 1);
      scrollback_max += count;
      if (scrollback_max > scrollback_phys_max)
            scrollback_max = scrollback_phys_max;
      scrollback_current = 0;
}

static __inline__ void ypan_up_redraw(struct vc_data *vc, int t, int count)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;
      struct display *p = &fb_display[vc->vc_num];

      p->yscroll += count;

      if (p->yscroll > p->vrows - vc->vc_rows) {
            p->yscroll -= p->vrows - vc->vc_rows;
            fbcon_redraw_move(vc, p, t + count, vc->vc_rows - count, t);
      }

      ops->var.xoffset = 0;
      ops->var.yoffset = p->yscroll * vc->vc_font.height;
      ops->var.vmode &= ~FB_VMODE_YWRAP;
      ops->update_start(info);
      fbcon_clear_margins(vc, 1);
      scrollback_max += count;
      if (scrollback_max > scrollback_phys_max)
            scrollback_max = scrollback_phys_max;
      scrollback_current = 0;
}

static __inline__ void ypan_down(struct vc_data *vc, int count)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct display *p = &fb_display[vc->vc_num];
      struct fbcon_ops *ops = info->fbcon_par;
      
      p->yscroll -= count;
      if (p->yscroll < 0) {
            ops->bmove(vc, info, 0, 0, p->vrows - vc->vc_rows,
                      0, vc->vc_rows, vc->vc_cols);
            p->yscroll += p->vrows - vc->vc_rows;
      }

      ops->var.xoffset = 0;
      ops->var.yoffset = p->yscroll * vc->vc_font.height;
      ops->var.vmode &= ~FB_VMODE_YWRAP;
      ops->update_start(info);
      fbcon_clear_margins(vc, 1);
      scrollback_max -= count;
      if (scrollback_max < 0)
            scrollback_max = 0;
      scrollback_current = 0;
}

static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;
      struct display *p = &fb_display[vc->vc_num];

      p->yscroll -= count;

      if (p->yscroll < 0) {
            p->yscroll += p->vrows - vc->vc_rows;
            fbcon_redraw_move(vc, p, t, vc->vc_rows - count, t + count);
      }

      ops->var.xoffset = 0;
      ops->var.yoffset = p->yscroll * vc->vc_font.height;
      ops->var.vmode &= ~FB_VMODE_YWRAP;
      ops->update_start(info);
      fbcon_clear_margins(vc, 1);
      scrollback_max -= count;
      if (scrollback_max < 0)
            scrollback_max = 0;
      scrollback_current = 0;
}

static void fbcon_redraw_softback(struct vc_data *vc, struct display *p,
                          long delta)
{
      int count = vc->vc_rows;
      unsigned short *d, *s;
      unsigned long n;
      int line = 0;

      d = (u16 *) softback_curr;
      if (d == (u16 *) softback_in)
            d = (u16 *) vc->vc_origin;
      n = softback_curr + delta * vc->vc_size_row;
      softback_lines -= delta;
      if (delta < 0) {
            if (softback_curr < softback_top && n < softback_buf) {
                  n += softback_end - softback_buf;
                  if (n < softback_top) {
                        softback_lines -=
                            (softback_top - n) / vc->vc_size_row;
                        n = softback_top;
                  }
            } else if (softback_curr >= softback_top
                     && n < softback_top) {
                  softback_lines -=
                      (softback_top - n) / vc->vc_size_row;
                  n = softback_top;
            }
      } else {
            if (softback_curr > softback_in && n >= softback_end) {
                  n += softback_buf - softback_end;
                  if (n > softback_in) {
                        n = softback_in;
                        softback_lines = 0;
                  }
            } else if (softback_curr <= softback_in && n > softback_in) {
                  n = softback_in;
                  softback_lines = 0;
            }
      }
      if (n == softback_curr)
            return;
      softback_curr = n;
      s = (u16 *) softback_curr;
      if (s == (u16 *) softback_in)
            s = (u16 *) vc->vc_origin;
      while (count--) {
            unsigned short *start;
            unsigned short *le;
            unsigned short c;
            int x = 0;
            unsigned short attr = 1;

            start = s;
            le = advance_row(s, 1);
            do {
                  c = scr_readw(s);
                  if (attr != (c & 0xff00)) {
                        attr = c & 0xff00;
                        if (s > start) {
                              fbcon_putcs(vc, start, s - start,
                                        line, x);
                              x += s - start;
                              start = s;
                        }
                  }
                  if (c == scr_readw(d)) {
                        if (s > start) {
                              fbcon_putcs(vc, start, s - start,
                                        line, x);
                              x += s - start + 1;
                              start = s + 1;
                        } else {
                              x++;
                              start++;
                        }
                  }
                  s++;
                  d++;
            } while (s < le);
            if (s > start)
                  fbcon_putcs(vc, start, s - start, line, x);
            line++;
            if (d == (u16 *) softback_end)
                  d = (u16 *) softback_buf;
            if (d == (u16 *) softback_in)
                  d = (u16 *) vc->vc_origin;
            if (s == (u16 *) softback_end)
                  s = (u16 *) softback_buf;
            if (s == (u16 *) softback_in)
                  s = (u16 *) vc->vc_origin;
      }
}

static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
                        int line, int count, int dy)
{
      unsigned short *s = (unsigned short *)
            (vc->vc_origin + vc->vc_size_row * line);

      while (count--) {
            unsigned short *start = s;
            unsigned short *le = advance_row(s, 1);
            unsigned short c;
            int x = 0;
            unsigned short attr = 1;

            do {
                  c = scr_readw(s);
                  if (attr != (c & 0xff00)) {
                        attr = c & 0xff00;
                        if (s > start) {
                              fbcon_putcs(vc, start, s - start,
                                        dy, x);
                              x += s - start;
                              start = s;
                        }
                  }
                  console_conditional_schedule();
                  s++;
            } while (s < le);
            if (s > start)
                  fbcon_putcs(vc, start, s - start, dy, x);
            console_conditional_schedule();
            dy++;
      }
}

static void fbcon_redraw_blit(struct vc_data *vc, struct fb_info *info,
                  struct display *p, int line, int count, int ycount)
{
      int offset = ycount * vc->vc_cols;
      unsigned short *d = (unsigned short *)
          (vc->vc_origin + vc->vc_size_row * line);
      unsigned short *s = d + offset;
      struct fbcon_ops *ops = info->fbcon_par;

      while (count--) {
            unsigned short *start = s;
            unsigned short *le = advance_row(s, 1);
            unsigned short c;
            int x = 0;

            do {
                  c = scr_readw(s);

                  if (c == scr_readw(d)) {
                        if (s > start) {
                              ops->bmove(vc, info, line + ycount, x,
                                       line, x, 1, s-start);
                              x += s - start + 1;
                              start = s + 1;
                        } else {
                              x++;
                              start++;
                        }
                  }

                  scr_writew(c, d);
                  console_conditional_schedule();
                  s++;
                  d++;
            } while (s < le);
            if (s > start)
                  ops->bmove(vc, info, line + ycount, x, line, x, 1,
                           s-start);
            console_conditional_schedule();
            if (ycount > 0)
                  line++;
            else {
                  line--;
                  /* NOTE: We subtract two lines from these pointers */
                  s -= vc->vc_size_row;
                  d -= vc->vc_size_row;
            }
      }
}

static void fbcon_redraw(struct vc_data *vc, struct display *p,
                   int line, int count, int offset)
{
      unsigned short *d = (unsigned short *)
          (vc->vc_origin + vc->vc_size_row * line);
      unsigned short *s = d + offset;

      while (count--) {
            unsigned short *start = s;
            unsigned short *le = advance_row(s, 1);
            unsigned short c;
            int x = 0;
            unsigned short attr = 1;

            do {
                  c = scr_readw(s);
                  if (attr != (c & 0xff00)) {
                        attr = c & 0xff00;
                        if (s > start) {
                              fbcon_putcs(vc, start, s - start,
                                        line, x);
                              x += s - start;
                              start = s;
                        }
                  }
                  if (c == scr_readw(d)) {
                        if (s > start) {
                              fbcon_putcs(vc, start, s - start,
                                         line, x);
                              x += s - start + 1;
                              start = s + 1;
                        } else {
                              x++;
                              start++;
                        }
                  }
                  scr_writew(c, d);
                  console_conditional_schedule();
                  s++;
                  d++;
            } while (s < le);
            if (s > start)
                  fbcon_putcs(vc, start, s - start, line, x);
            console_conditional_schedule();
            if (offset > 0)
                  line++;
            else {
                  line--;
                  /* NOTE: We subtract two lines from these pointers */
                  s -= vc->vc_size_row;
                  d -= vc->vc_size_row;
            }
      }
}

static inline void fbcon_softback_note(struct vc_data *vc, int t,
                               int count)
{
      unsigned short *p;

      if (vc->vc_num != fg_console)
            return;
      p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);

      while (count) {
            scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
            count--;
            p = advance_row(p, 1);
            softback_in += vc->vc_size_row;
            if (softback_in == softback_end)
                  softback_in = softback_buf;
            if (softback_in == softback_top) {
                  softback_top += vc->vc_size_row;
                  if (softback_top == softback_end)
                        softback_top = softback_buf;
            }
      }
      softback_curr = softback_in;
}

static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
                  int count)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct display *p = &fb_display[vc->vc_num];
      int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;

      if (fbcon_is_inactive(vc, info))
            return -EINVAL;

      fbcon_cursor(vc, CM_ERASE);

      /*
       * ++Geert: Only use ywrap/ypan if the console is in text mode
       * ++Andrew: Only use ypan on hardware text mode when scrolling the
       *           whole screen (prevents flicker).
       */

      switch (dir) {
      case SM_UP:
            if (count > vc->vc_rows)      /* Maximum realistic size */
                  count = vc->vc_rows;
            if (softback_top)
                  fbcon_softback_note(vc, t, count);
            if (logo_shown >= 0)
                  goto redraw_up;
            switch (p->scrollmode) {
            case SCROLL_MOVE:
                  fbcon_redraw_blit(vc, info, p, t, b - t - count,
                             count);
                  fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
                  scr_memsetw((unsigned short *) (vc->vc_origin +
                                          vc->vc_size_row *
                                          (b - count)),
                            vc->vc_video_erase_char,
                            vc->vc_size_row * count);
                  return 1;
                  break;

            case SCROLL_WRAP_MOVE:
                  if (b - t - count > 3 * vc->vc_rows >> 2) {
                        if (t > 0)
                              fbcon_bmove(vc, 0, 0, count, 0, t,
                                        vc->vc_cols);
                        ywrap_up(vc, count);
                        if (vc->vc_rows - b > 0)
                              fbcon_bmove(vc, b - count, 0, b, 0,
                                        vc->vc_rows - b,
                                        vc->vc_cols);
                  } else if (info->flags & FBINFO_READS_FAST)
                        fbcon_bmove(vc, t + count, 0, t, 0,
                                  b - t - count, vc->vc_cols);
                  else
                        goto redraw_up;
                  fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
                  break;

            case SCROLL_PAN_REDRAW:
                  if ((p->yscroll + count <=
                       2 * (p->vrows - vc->vc_rows))
                      && ((!scroll_partial && (b - t == vc->vc_rows))
                        || (scroll_partial
                            && (b - t - count >
                              3 * vc->vc_rows >> 2)))) {
                        if (t > 0)
                              fbcon_redraw_move(vc, p, 0, t, count);
                        ypan_up_redraw(vc, t, count);
                        if (vc->vc_rows - b > 0)
                              fbcon_redraw_move(vc, p, b,
                                            vc->vc_rows - b, b);
                  } else
                        fbcon_redraw_move(vc, p, t + count, b - t - count, t);
                  fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
                  break;

            case SCROLL_PAN_MOVE:
                  if ((p->yscroll + count <=
                       2 * (p->vrows - vc->vc_rows))
                      && ((!scroll_partial && (b - t == vc->vc_rows))
                        || (scroll_partial
                            && (b - t - count >
                              3 * vc->vc_rows >> 2)))) {
                        if (t > 0)
                              fbcon_bmove(vc, 0, 0, count, 0, t,
                                        vc->vc_cols);
                        ypan_up(vc, count);
                        if (vc->vc_rows - b > 0)
                              fbcon_bmove(vc, b - count, 0, b, 0,
                                        vc->vc_rows - b,
                                        vc->vc_cols);
                  } else if (info->flags & FBINFO_READS_FAST)
                        fbcon_bmove(vc, t + count, 0, t, 0,
                                  b - t - count, vc->vc_cols);
                  else
                        goto redraw_up;
                  fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
                  break;

            case SCROLL_REDRAW:
                  redraw_up:
                  fbcon_redraw(vc, p, t, b - t - count,
                             count * vc->vc_cols);
                  fbcon_clear(vc, b - count, 0, count, vc->vc_cols);
                  scr_memsetw((unsigned short *) (vc->vc_origin +
                                          vc->vc_size_row *
                                          (b - count)),
                            vc->vc_video_erase_char,
                            vc->vc_size_row * count);
                  return 1;
            }
            break;

      case SM_DOWN:
            if (count > vc->vc_rows)      /* Maximum realistic size */
                  count = vc->vc_rows;
            if (logo_shown >= 0)
                  goto redraw_down;
            switch (p->scrollmode) {
            case SCROLL_MOVE:
                  fbcon_redraw_blit(vc, info, p, b - 1, b - t - count,
                             -count);
                  fbcon_clear(vc, t, 0, count, vc->vc_cols);
                  scr_memsetw((unsigned short *) (vc->vc_origin +
                                          vc->vc_size_row *
                                          t),
                            vc->vc_video_erase_char,
                            vc->vc_size_row * count);
                  return 1;
                  break;

            case SCROLL_WRAP_MOVE:
                  if (b - t - count > 3 * vc->vc_rows >> 2) {
                        if (vc->vc_rows - b > 0)
                              fbcon_bmove(vc, b, 0, b - count, 0,
                                        vc->vc_rows - b,
                                        vc->vc_cols);
                        ywrap_down(vc, count);
                        if (t > 0)
                              fbcon_bmove(vc, count, 0, 0, 0, t,
                                        vc->vc_cols);
                  } else if (info->flags & FBINFO_READS_FAST)
                        fbcon_bmove(vc, t, 0, t + count, 0,
                                  b - t - count, vc->vc_cols);
                  else
                        goto redraw_down;
                  fbcon_clear(vc, t, 0, count, vc->vc_cols);
                  break;

            case SCROLL_PAN_MOVE:
                  if ((count - p->yscroll <= p->vrows - vc->vc_rows)
                      && ((!scroll_partial && (b - t == vc->vc_rows))
                        || (scroll_partial
                            && (b - t - count >
                              3 * vc->vc_rows >> 2)))) {
                        if (vc->vc_rows - b > 0)
                              fbcon_bmove(vc, b, 0, b - count, 0,
                                        vc->vc_rows - b,
                                        vc->vc_cols);
                        ypan_down(vc, count);
                        if (t > 0)
                              fbcon_bmove(vc, count, 0, 0, 0, t,
                                        vc->vc_cols);
                  } else if (info->flags & FBINFO_READS_FAST)
                        fbcon_bmove(vc, t, 0, t + count, 0,
                                  b - t - count, vc->vc_cols);
                  else
                        goto redraw_down;
                  fbcon_clear(vc, t, 0, count, vc->vc_cols);
                  break;

            case SCROLL_PAN_REDRAW:
                  if ((count - p->yscroll <= p->vrows - vc->vc_rows)
                      && ((!scroll_partial && (b - t == vc->vc_rows))
                        || (scroll_partial
                            && (b - t - count >
                              3 * vc->vc_rows >> 2)))) {
                        if (vc->vc_rows - b > 0)
                              fbcon_redraw_move(vc, p, b, vc->vc_rows - b,
                                            b - count);
                        ypan_down_redraw(vc, t, count);
                        if (t > 0)
                              fbcon_redraw_move(vc, p, count, t, 0);
                  } else
                        fbcon_redraw_move(vc, p, t, b - t - count, t + count);
                  fbcon_clear(vc, t, 0, count, vc->vc_cols);
                  break;

            case SCROLL_REDRAW:
                  redraw_down:
                  fbcon_redraw(vc, p, b - 1, b - t - count,
                             -count * vc->vc_cols);
                  fbcon_clear(vc, t, 0, count, vc->vc_cols);
                  scr_memsetw((unsigned short *) (vc->vc_origin +
                                          vc->vc_size_row *
                                          t),
                            vc->vc_video_erase_char,
                            vc->vc_size_row * count);
                  return 1;
            }
      }
      return 0;
}


static void fbcon_bmove(struct vc_data *vc, int sy, int sx, int dy, int dx,
                  int height, int width)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct display *p = &fb_display[vc->vc_num];
      
      if (fbcon_is_inactive(vc, info))
            return;

      if (!width || !height)
            return;

      /*  Split blits that cross physical y_wrap case.
       *  Pathological case involves 4 blits, better to use recursive
       *  code rather than unrolled case
       *
       *  Recursive invocations don't need to erase the cursor over and
       *  over again, so we use fbcon_bmove_rec()
       */
      fbcon_bmove_rec(vc, p, sy, sx, dy, dx, height, width,
                  p->vrows - p->yscroll);
}

static void fbcon_bmove_rec(struct vc_data *vc, struct display *p, int sy, int sx, 
                      int dy, int dx, int height, int width, u_int y_break)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;
      u_int b;

      if (sy < y_break && sy + height > y_break) {
            b = y_break - sy;
            if (dy < sy) {    /* Avoid trashing self */
                  fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
                              y_break);
                  fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
                              height - b, width, y_break);
            } else {
                  fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
                              height - b, width, y_break);
                  fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
                              y_break);
            }
            return;
      }

      if (dy < y_break && dy + height > y_break) {
            b = y_break - dy;
            if (dy < sy) {    /* Avoid trashing self */
                  fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
                              y_break);
                  fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
                              height - b, width, y_break);
            } else {
                  fbcon_bmove_rec(vc, p, sy + b, sx, dy + b, dx,
                              height - b, width, y_break);
                  fbcon_bmove_rec(vc, p, sy, sx, dy, dx, b, width,
                              y_break);
            }
            return;
      }
      ops->bmove(vc, info, real_y(p, sy), sx, real_y(p, dy), dx,
               height, width);
}

static __inline__ void updatescrollmode(struct display *p,
                              struct fb_info *info,
                              struct vc_data *vc)
{
      struct fbcon_ops *ops = info->fbcon_par;
      int fh = vc->vc_font.height;
      int cap = info->flags;
      u16 t = 0;
      int ypan = FBCON_SWAP(ops->rotate, info->fix.ypanstep,
                          info->fix.xpanstep);
      int ywrap = FBCON_SWAP(ops->rotate, info->fix.ywrapstep, t);
      int yres = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
      int vyres = FBCON_SWAP(ops->rotate, info->var.yres_virtual,
                           info->var.xres_virtual);
      int good_pan = (cap & FBINFO_HWACCEL_YPAN) &&
            divides(ypan, vc->vc_font.height) && vyres > yres;
      int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) &&
            divides(ywrap, vc->vc_font.height) &&
            divides(vc->vc_font.height, vyres) &&
            divides(vc->vc_font.height, yres);
      int reading_fast = cap & FBINFO_READS_FAST;
      int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) &&
            !(cap & FBINFO_HWACCEL_DISABLED);
      int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) &&
            !(cap & FBINFO_HWACCEL_DISABLED);

      p->vrows = vyres/fh;
      if (yres > (fh * (vc->vc_rows + 1)))
            p->vrows -= (yres - (fh * vc->vc_rows)) / fh;
      if ((yres % fh) && (vyres % fh < yres % fh))
            p->vrows--;

      if (good_wrap || good_pan) {
            if (reading_fast || fast_copyarea)
                  p->scrollmode = good_wrap ?
                        SCROLL_WRAP_MOVE : SCROLL_PAN_MOVE;
            else
                  p->scrollmode = good_wrap ? SCROLL_REDRAW :
                        SCROLL_PAN_REDRAW;
      } else {
            if (reading_fast || (fast_copyarea && !fast_imageblit))
                  p->scrollmode = SCROLL_MOVE;
            else
                  p->scrollmode = SCROLL_REDRAW;
      }
}

static int fbcon_resize(struct vc_data *vc, unsigned int width, 
                  unsigned int height, unsigned int user)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;
      struct display *p = &fb_display[vc->vc_num];
      struct fb_var_screeninfo var = info->var;
      int x_diff, y_diff, virt_w, virt_h, virt_fw, virt_fh;

      virt_w = FBCON_SWAP(ops->rotate, width, height);
      virt_h = FBCON_SWAP(ops->rotate, height, width);
      virt_fw = FBCON_SWAP(ops->rotate, vc->vc_font.width,
                         vc->vc_font.height);
      virt_fh = FBCON_SWAP(ops->rotate, vc->vc_font.height,
                         vc->vc_font.width);
      var.xres = virt_w * virt_fw;
      var.yres = virt_h * virt_fh;
      x_diff = info->var.xres - var.xres;
      y_diff = info->var.yres - var.yres;
      if (x_diff < 0 || x_diff > virt_fw ||
          y_diff < 0 || y_diff > virt_fh) {
            const struct fb_videomode *mode;

            DPRINTK("attempting resize %ix%i\n", var.xres, var.yres);
            mode = fb_find_best_mode(&var, &info->modelist);
            if (mode == NULL)
                  return -EINVAL;
            display_to_var(&var, p);
            fb_videomode_to_var(&var, mode);

            if (virt_w > var.xres/virt_fw || virt_h > var.yres/virt_fh)
                  return -EINVAL;

            DPRINTK("resize now %ix%i\n", var.xres, var.yres);
            if (CON_IS_VISIBLE(vc)) {
                  var.activate = FB_ACTIVATE_NOW |
                        FB_ACTIVATE_FORCE;
                  fb_set_var(info, &var);
            }
            var_to_display(p, &info->var, info);
            ops->var = info->var;
      }
      updatescrollmode(p, info, vc);
      return 0;
}

static int fbcon_switch(struct vc_data *vc)
{
      struct fb_info *info, *old_info = NULL;
      struct fbcon_ops *ops;
      struct display *p = &fb_display[vc->vc_num];
      struct fb_var_screeninfo var;
      int i, prev_console, charcnt = 256;

      info = registered_fb[con2fb_map[vc->vc_num]];
      ops = info->fbcon_par;

      if (softback_top) {
            if (softback_lines)
                  fbcon_set_origin(vc);
            softback_top = softback_curr = softback_in = softback_buf;
            softback_lines = 0;
            fbcon_update_softback(vc);
      }

      if (logo_shown >= 0) {
            struct vc_data *conp2 = vc_cons[logo_shown].d;

            if (conp2->vc_top == logo_lines
                && conp2->vc_bottom == conp2->vc_rows)
                  conp2->vc_top = 0;
            logo_shown = FBCON_LOGO_CANSHOW;
      }

      prev_console = ops->currcon;
      if (prev_console != -1)
            old_info = registered_fb[con2fb_map[prev_console]];
      /*
       * FIXME: If we have multiple fbdev's loaded, we need to
       * update all info->currcon.  Perhaps, we can place this
       * in a centralized structure, but this might break some
       * drivers.
       *
       * info->currcon = vc->vc_num;
       */
      for (i = 0; i < FB_MAX; i++) {
            if (registered_fb[i] != NULL && registered_fb[i]->fbcon_par) {
                  struct fbcon_ops *o = registered_fb[i]->fbcon_par;

                  o->currcon = vc->vc_num;
            }
      }
      memset(&var, 0, sizeof(struct fb_var_screeninfo));
      display_to_var(&var, p);
      var.activate = FB_ACTIVATE_NOW;

      /*
       * make sure we don't unnecessarily trip the memcmp()
       * in fb_set_var()
       */
      info->var.activate = var.activate;
      var.yoffset = info->var.yoffset;
      var.xoffset = info->var.xoffset;
      var.vmode = info->var.vmode;
      fb_set_var(info, &var);
      ops->var = info->var;

      if (old_info != NULL && (old_info != info ||
                         info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
            if (info->fbops->fb_set_par)
                  info->fbops->fb_set_par(info);

            if (old_info != info)
                  fbcon_del_cursor_timer(old_info);
      }

      if (fbcon_is_inactive(vc, info) ||
          ops->blank_state != FB_BLANK_UNBLANK)
            fbcon_del_cursor_timer(info);
      else
            fbcon_add_cursor_timer(info);

      set_blitting_type(vc, info);
      ops->cursor_reset = 1;

      if (ops->rotate_font && ops->rotate_font(info, vc)) {
            ops->rotate = FB_ROTATE_UR;
            set_blitting_type(vc, info);
      }

      vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
      vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;

      if (p->userfont)
            charcnt = FNTCHARCNT(vc->vc_font.data);

      if (charcnt > 256)
            vc->vc_complement_mask <<= 1;

      updatescrollmode(p, info, vc);

      switch (p->scrollmode) {
      case SCROLL_WRAP_MOVE:
            scrollback_phys_max = p->vrows - vc->vc_rows;
            break;
      case SCROLL_PAN_MOVE:
      case SCROLL_PAN_REDRAW:
            scrollback_phys_max = p->vrows - 2 * vc->vc_rows;
            if (scrollback_phys_max < 0)
                  scrollback_phys_max = 0;
            break;
      default:
            scrollback_phys_max = 0;
            break;
      }

      scrollback_max = 0;
      scrollback_current = 0;

      if (!fbcon_is_inactive(vc, info)) {
          ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
          ops->update_start(info);
      }

      fbcon_set_palette(vc, color_table);       
      fbcon_clear_margins(vc, 0);

      if (logo_shown == FBCON_LOGO_DRAW) {

            logo_shown = fg_console;
            /* This is protected above by initmem_freed */
            fb_show_logo(info, ops->rotate);
            update_region(vc,
                        vc->vc_origin + vc->vc_size_row * vc->vc_top,
                        vc->vc_size_row * (vc->vc_bottom -
                                     vc->vc_top) / 2);
            return 0;
      }
      return 1;
}

static void fbcon_generic_blank(struct vc_data *vc, struct fb_info *info,
                        int blank)
{
      struct fb_event event;

      if (blank) {
            unsigned short charmask = vc->vc_hi_font_mask ?
                  0x1ff : 0xff;
            unsigned short oldc;

            oldc = vc->vc_video_erase_char;
            vc->vc_video_erase_char &= charmask;
            fbcon_clear(vc, 0, 0, vc->vc_rows, vc->vc_cols);
            vc->vc_video_erase_char = oldc;
      }


      event.info = info;
      event.data = &blank;
      fb_notifier_call_chain(FB_EVENT_CONBLANK, &event);
}

static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;

      if (mode_switch) {
            struct fb_var_screeninfo var = info->var;

            ops->graphics = 1;

            if (!blank) {
                  if (info->fbops->fb_save_state)
                        info->fbops->fb_save_state(info);
                  var.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE;
                  fb_set_var(info, &var);
                  ops->graphics = 0;
                  ops->var = info->var;
            } else if (info->fbops->fb_restore_state)
                  info->fbops->fb_restore_state(info);
      }

      if (!fbcon_is_inactive(vc, info)) {
            if (ops->blank_state != blank) {
                  ops->blank_state = blank;
                  fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
                  ops->cursor_flash = (!blank);

                  if (fb_blank(info, blank))
                        fbcon_generic_blank(vc, info, blank);
            }

            if (!blank)
                  update_screen(vc);
      }

      if (mode_switch || fbcon_is_inactive(vc, info) ||
          ops->blank_state != FB_BLANK_UNBLANK)
            fbcon_del_cursor_timer(info);
      else
            fbcon_add_cursor_timer(info);

      return 0;
}

static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
{
      u8 *fontdata = vc->vc_font.data;
      u8 *data = font->data;
      int i, j;

      font->width = vc->vc_font.width;
      font->height = vc->vc_font.height;
      font->charcount = vc->vc_hi_font_mask ? 512 : 256;
      if (!font->data)
            return 0;

      if (font->width <= 8) {
            j = vc->vc_font.height;
            for (i = 0; i < font->charcount; i++) {
                  memcpy(data, fontdata, j);
                  memset(data + j, 0, 32 - j);
                  data += 32;
                  fontdata += j;
            }
      } else if (font->width <= 16) {
            j = vc->vc_font.height * 2;
            for (i = 0; i < font->charcount; i++) {
                  memcpy(data, fontdata, j);
                  memset(data + j, 0, 64 - j);
                  data += 64;
                  fontdata += j;
            }
      } else if (font->width <= 24) {
            for (i = 0; i < font->charcount; i++) {
                  for (j = 0; j < vc->vc_font.height; j++) {
                        *data++ = fontdata[0];
                        *data++ = fontdata[1];
                        *data++ = fontdata[2];
                        fontdata += sizeof(u32);
                  }
                  memset(data, 0, 3 * (32 - j));
                  data += 3 * (32 - j);
            }
      } else {
            j = vc->vc_font.height * 4;
            for (i = 0; i < font->charcount; i++) {
                  memcpy(data, fontdata, j);
                  memset(data + j, 0, 128 - j);
                  data += 128;
                  fontdata += j;
            }
      }
      return 0;
}

static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
                       const u8 * data, int userfont)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      struct fbcon_ops *ops = info->fbcon_par;
      struct display *p = &fb_display[vc->vc_num];
      int resize;
      int cnt;
      char *old_data = NULL;

      if (CON_IS_VISIBLE(vc) && softback_lines)
            fbcon_set_origin(vc);

      resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
      if (p->userfont)
            old_data = vc->vc_font.data;
      if (userfont)
            cnt = FNTCHARCNT(data);
      else
            cnt = 256;
      vc->vc_font.data = (void *)(p->fontdata = data);
      if ((p->userfont = userfont))
            REFCOUNT(data)++;
      vc->vc_font.width = w;
      vc->vc_font.height = h;
      if (vc->vc_hi_font_mask && cnt == 256) {
            vc->vc_hi_font_mask = 0;
            if (vc->vc_can_do_color) {
                  vc->vc_complement_mask >>= 1;
                  vc->vc_s_complement_mask >>= 1;
            }
                  
            /* ++Edmund: reorder the attribute bits */
            if (vc->vc_can_do_color) {
                  unsigned short *cp =
                      (unsigned short *) vc->vc_origin;
                  int count = vc->vc_screenbuf_size / 2;
                  unsigned short c;
                  for (; count > 0; count--, cp++) {
                        c = scr_readw(cp);
                        scr_writew(((c & 0xfe00) >> 1) |
                                 (c & 0xff), cp);
                  }
                  c = vc->vc_video_erase_char;
                  vc->vc_video_erase_char =
                      ((c & 0xfe00) >> 1) | (c & 0xff);
                  vc->vc_attr >>= 1;
            }
      } else if (!vc->vc_hi_font_mask && cnt == 512) {
            vc->vc_hi_font_mask = 0x100;
            if (vc->vc_can_do_color) {
                  vc->vc_complement_mask <<= 1;
                  vc->vc_s_complement_mask <<= 1;
            }
                  
            /* ++Edmund: reorder the attribute bits */
            {
                  unsigned short *cp =
                      (unsigned short *) vc->vc_origin;
                  int count = vc->vc_screenbuf_size / 2;
                  unsigned short c;
                  for (; count > 0; count--, cp++) {
                        unsigned short newc;
                        c = scr_readw(cp);
                        if (vc->vc_can_do_color)
                              newc =
                                  ((c & 0xff00) << 1) | (c &
                                                   0xff);
                        else
                              newc = c & ~0x100;
                        scr_writew(newc, cp);
                  }
                  c = vc->vc_video_erase_char;
                  if (vc->vc_can_do_color) {
                        vc->vc_video_erase_char =
                            ((c & 0xff00) << 1) | (c & 0xff);
                        vc->vc_attr <<= 1;
                  } else
                        vc->vc_video_erase_char = c & ~0x100;
            }

      }

      if (resize) {
            int cols, rows;

            cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
            rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
            cols /= w;
            rows /= h;
            vc_resize(vc, cols, rows);
            if (CON_IS_VISIBLE(vc) && softback_buf)
                  fbcon_update_softback(vc);
      } else if (CON_IS_VISIBLE(vc)
               && vc->vc_mode == KD_TEXT) {
            fbcon_clear_margins(vc, 0);
            update_screen(vc);
      }

      if (old_data && (--REFCOUNT(old_data) == 0))
            kfree(old_data - FONT_EXTRA_WORDS * sizeof(int));
      return 0;
}

static int fbcon_copy_font(struct vc_data *vc, int con)
{
      struct display *od = &fb_display[con];
      struct console_font *f = &vc->vc_font;

      if (od->fontdata == f->data)
            return 0;   /* already the same font... */
      return fbcon_do_set_font(vc, f->width, f->height, od->fontdata, od->userfont);
}

/*
 *  User asked to set font; we are guaranteed that
 *    a) width and height are in range 1..32
 *    b) charcount does not exceed 512
 *  but lets not assume that, since someone might someday want to use larger
 *  fonts. And charcount of 512 is small for unicode support.
 *
 *  However, user space gives the font in 32 rows , regardless of
 *  actual font height. So a new API is needed if support for larger fonts
 *  is ever implemented.
 */

static int fbcon_set_font(struct vc_data *vc, struct console_font *font, unsigned flags)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      unsigned charcount = font->charcount;
      int w = font->width;
      int h = font->height;
      int size;
      int i, csum;
      u8 *new_data, *data = font->data;
      int pitch = (font->width+7) >> 3;

      /* Is there a reason why fbconsole couldn't handle any charcount >256?
       * If not this check should be changed to charcount < 256 */
      if (charcount != 256 && charcount != 512)
            return -EINVAL;

      /* Make sure drawing engine can handle the font */
      if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
          !(info->pixmap.blit_y & (1 << (font->height - 1))))
            return -EINVAL;

      /* Make sure driver can handle the font length */
      if (fbcon_invalid_charcount(info, charcount))
            return -EINVAL;

      size = h * pitch * charcount;

      new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);

      if (!new_data)
            return -ENOMEM;

      new_data += FONT_EXTRA_WORDS * sizeof(int);
      FNTSIZE(new_data) = size;
      FNTCHARCNT(new_data) = charcount;
      REFCOUNT(new_data) = 0; /* usage counter */
      for (i=0; i< charcount; i++) {
            memcpy(new_data + i*h*pitch, data +  i*32*pitch, h*pitch);
      }

      /* Since linux has a nice crc32 function use it for counting font
       * checksums. */
      csum = crc32(0, new_data, size);

      FNTSUM(new_data) = csum;
      /* Check if the same font is on some other console already */
      for (i = first_fb_vc; i <= last_fb_vc; i++) {
            struct vc_data *tmp = vc_cons[i].d;
            
            if (fb_display[i].userfont &&
                fb_display[i].fontdata &&
                FNTSUM(fb_display[i].fontdata) == csum &&
                FNTSIZE(fb_display[i].fontdata) == size &&
                tmp->vc_font.width == w &&
                !memcmp(fb_display[i].fontdata, new_data, size)) {
                  kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
                  new_data = (u8 *)fb_display[i].fontdata;
                  break;
            }
      }
      return fbcon_do_set_font(vc, font->width, font->height, new_data, 1);
}

static int fbcon_set_def_font(struct vc_data *vc, struct console_font *font, char *name)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      const struct font_desc *f;

      if (!name)
            f = get_default_font(info->var.xres, info->var.yres,
                             info->pixmap.blit_x, info->pixmap.blit_y);
      else if (!(f = find_font(name)))
            return -ENOENT;

      font->width = f->width;
      font->height = f->height;
      return fbcon_do_set_font(vc, f->width, f->height, f->data, 0);
}

static u16 palette_red[16];
static u16 palette_green[16];
static u16 palette_blue[16];

static struct fb_cmap palette_cmap = {
      0, 16, palette_red, palette_green, palette_blue, NULL
};

static int fbcon_set_palette(struct vc_data *vc, unsigned char *table)
{
      struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
      int i, j, k, depth;
      u8 val;

      if (fbcon_is_inactive(vc, info))
            return -EINVAL;

      if (!CON_IS_VISIBLE(vc))
            return 0;

      depth = fb_get_color_depth(&info->var, &info->fix);
      if (depth > 3) {
            for (i = j = 0; i < 16; i++) {
                  k = table[i];
                  val = vc->vc_palette[j++];
                  palette_red[k] = (val << 8) | val;
                  val = vc->vc_palette[j++];
                  palette_green[k] = (val << 8) | val;
                  val = vc->vc_palette[j++];
                  palette_blue[k] = (val << 8) | val;
            }
            palette_cmap.len = 16;
            palette_cmap.start = 0;
      /*
       * If framebuffer is capable of less than 16 colors,
       * use default palette of fbcon.
       */
      } else
            fb_copy_cmap(fb_default_cmap(1 << depth), &palette_cmap);

      return fb_set_cmap(&palette_cmap, info);
}

static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
{
      unsigned long p;
      int line;
      
      if (vc->vc_num != fg_console || !softback_lines)
            return (u16 *) (vc->vc_origin + offset);
      line = offset / vc->vc_size_row;
      if (line >= softback_lines)
            return (u16 *) (vc->vc_origin + offset -
                        softback_lines * vc->vc_size_row);
      p = softback_curr + offset;
      if (p >= softback_end)
            p += softback_buf - softback_end;
      return (u16 *) p;
}

static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
                         int *px, int *py)
{
      unsigned long ret;
      int x, y;

      if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
            unsigned long offset = (pos - vc->vc_origin) / 2;

            x = offset % vc->vc_cols;
            y = offset / vc->vc_cols;
            if (vc->vc_num == fg_console)
                  y += softback_lines;
            ret = pos + (vc->vc_cols - x) * 2;
      } else if (vc->vc_num == fg_console && softback_lines) {
            unsigned long offset = pos - softback_curr;

            if (pos < softback_curr)
                  offset += softback_end - softback_buf;
            offset /= 2;
            x = offset % vc->vc_cols;
            y = offset / vc->vc_cols;
            ret = pos + (vc->vc_cols - x) * 2;
            if (ret == softback_end)
                  ret = softback_buf;
            if (ret == softback_in)
                  ret = vc->vc_origin;
      } else {
            /* Should not happen */
            x = y = 0;
            ret = vc->vc_origin;
      }
      if (px)
            *px = x;
      if (py)
            *py = y;
      return ret;
}

/* As we might be inside of softback, we may work with non-contiguous buffer,
   that's why we have to use a separate routine. */
static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
{
      while (cnt--) {
            u16 a = scr_readw(p);
            if (!vc->vc_can_do_color)
                  a ^= 0x0800;
            else if (vc->vc_hi_font_mask == 0x100)
                  a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) |
                      (((a) & 0x0e00) << 4);
            else
                  a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
                      (((a) & 0x0700) << 4);
            scr_writew(a, p++);
            if (p == (u16 *) softback_end)
                  p = (u16 *) softback_buf;
            if (p == (u16 *) softback_in)
                  p = (u16 *) vc->vc_origin;
      }
}

static int fbcon_scrolldelta(struct vc_data *vc, int lines)
{
      struct fb_info *info = registered_fb[con2fb_map[fg_console]];
      struct fbcon_ops *ops = info->fbcon_par;
      struct display *p = &fb_display[fg_console];
      int offset, limit, scrollback_old;

      if (softback_top) {
            if (vc->vc_num != fg_console)
                  return 0;
            if (vc->vc_mode != KD_TEXT || !lines)
                  return 0;
            if (logo_shown >= 0) {
                  struct vc_data *conp2 = vc_cons[logo_shown].d;

                  if (conp2->vc_top == logo_lines
                      && conp2->vc_bottom == conp2->vc_rows)
                        conp2->vc_top = 0;
                  if (logo_shown == vc->vc_num) {
                        unsigned long p, q;
                        int i;

                        p = softback_in;
                        q = vc->vc_origin +
                            logo_lines * vc->vc_size_row;
                        for (i = 0; i < logo_lines; i++) {
                              if (p == softback_top)
                                    break;
                              if (p == softback_buf)
                                    p = softback_end;
                              p -= vc->vc_size_row;
                              q -= vc->vc_size_row;
                              scr_memcpyw((u16 *) q, (u16 *) p,
                                        vc->vc_size_row);
                        }
                        softback_in = softback_curr = p;
                        update_region(vc, vc->vc_origin,
                                    logo_lines * vc->vc_cols);
                  }
                  logo_shown = FBCON_LOGO_CANSHOW;
            }
            fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
            fbcon_redraw_softback(vc, p, lines);
            fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
            return 0;
      }

      if (!scrollback_phys_max)
            return -ENOSYS;

      scrollback_old = scrollback_current;
      scrollback_current -= lines;
      if (scrollback_current < 0)
            scrollback_current = 0;
      else if (scrollback_current > scrollback_max)
            scrollback_current = scrollback_max;
      if (scrollback_current == scrollback_old)
            return 0;

      if (fbcon_is_inactive(vc, info))
            return 0;

      fbcon_cursor(vc, CM_ERASE);

      offset = p->yscroll - scrollback_current;
      limit = p->vrows;
      switch (p->scrollmode) {
      case SCROLL_WRAP_MOVE:
            info->var.vmode |= FB_VMODE_YWRAP;
            break;
      case SCROLL_PAN_MOVE:
      case SCROLL_PAN_REDRAW:
            limit -= vc->vc_rows;
            info->var.vmode &= ~FB_VMODE_YWRAP;
            break;
      }
      if (offset < 0)
            offset += limit;
      else if (offset >= limit)
            offset -= limit;

      ops->var.xoffset = 0;
      ops->var.yoffset = offset * vc->vc_font.height;
      ops->update_start(info);

      if (!scrollback_current)
            fbcon_cursor(vc, CM_DRAW);
      return 0;
}

static int fbcon_set_origin(struct vc_data *vc)
{
      if (softback_lines)
            fbcon_scrolldelta(vc, softback_lines);
      return 0;
}

static void fbcon_suspended(struct fb_info *info)
{
      struct vc_data *vc = NULL;
      struct fbcon_ops *ops = info->fbcon_par;

      if (!ops || ops->currcon < 0)
            return;
      vc = vc_cons[ops->currcon].d;

      /* Clear cursor, restore saved data */
      fbcon_cursor(vc, CM_ERASE);
}

static void fbcon_resumed(struct fb_info *info)
{
      struct vc_data *vc;
      struct fbcon_ops *ops = info->fbcon_par;

      if (!ops || ops->currcon < 0)
            return;
      vc = vc_cons[ops->currcon].d;

      update_screen(vc);
}

static void fbcon_modechanged(struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;
      struct vc_data *vc;
      struct display *p;
      int rows, cols;

      if (!ops || ops->currcon < 0)
            return;
      vc = vc_cons[ops->currcon].d;
      if (vc->vc_mode != KD_TEXT ||
          registered_fb[con2fb_map[ops->currcon]] != info)
            return;

      p = &fb_display[vc->vc_num];
      set_blitting_type(vc, info);

      if (CON_IS_VISIBLE(vc)) {
            var_to_display(p, &info->var, info);
            cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
            rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
            cols /= vc->vc_font.width;
            rows /= vc->vc_font.height;
            vc_resize(vc, cols, rows);
            updatescrollmode(p, info, vc);
            scrollback_max = 0;
            scrollback_current = 0;

            if (!fbcon_is_inactive(vc, info)) {
                ops->var.xoffset = ops->var.yoffset = p->yscroll = 0;
                ops->update_start(info);
            }

            fbcon_set_palette(vc, color_table);
            update_screen(vc);
            if (softback_buf)
                  fbcon_update_softback(vc);
      }
}

static void fbcon_set_all_vcs(struct fb_info *info)
{
      struct fbcon_ops *ops = info->fbcon_par;
      struct vc_data *vc;
      struct display *p;
      int i, rows, cols, fg = -1;

      if (!ops || ops->currcon < 0)
            return;

      for (i = first_fb_vc; i <= last_fb_vc; i++) {
            vc = vc_cons[i].d;
            if (!vc || vc->vc_mode != KD_TEXT ||
                registered_fb[con2fb_map[i]] != info)
                  continue;

            if (CON_IS_VISIBLE(vc)) {
                  fg = i;
                  continue;
            }

            p = &fb_display[vc->vc_num];
            set_blitting_type(vc, info);
            var_to_display(p, &info->var, info);
            cols = FBCON_SWAP(p->rotate, info->var.xres, info->var.yres);
            rows = FBCON_SWAP(p->rotate, info->var.yres, info->var.xres);
            cols /= vc->vc_font.width;
            rows /= vc->vc_font.height;
            vc_resize(vc, cols, rows);
      }

      if (fg != -1)
            fbcon_modechanged(info);
}

static int fbcon_mode_deleted(struct fb_info *info,
                        struct fb_videomode *mode)
{
      struct fb_info *fb_info;
      struct display *p;
      int i, j, found = 0;

      /* before deletion, ensure that mode is not in use */
      for (i = first_fb_vc; i <= last_fb_vc; i++) {
            j = con2fb_map[i];
            if (j == -1)
                  continue;
            fb_info = registered_fb[j];
            if (fb_info != info)
                  continue;
            p = &fb_display[i];
            if (!p || !p->mode)
                  continue;
            if (fb_mode_is_equal(p->mode, mode)) {
                  found = 1;
                  break;
            }
      }
      return found;
}

#ifdef CONFIG_VT_HW_CONSOLE_BINDING
static int fbcon_unbind(void)
{
      int ret;

      ret = unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
                        fbcon_is_default);
      return ret;
}
#else
static inline int fbcon_unbind(void)
{
      return -EINVAL;
}
#endif /* CONFIG_VT_HW_CONSOLE_BINDING */

static int fbcon_fb_unbind(int idx)
{
      int i, new_idx = -1, ret = 0;

      for (i = first_fb_vc; i <= last_fb_vc; i++) {
            if (con2fb_map[i] != idx &&
                con2fb_map[i] != -1) {
                  new_idx = i;
                  break;
            }
      }

      if (new_idx != -1) {
            for (i = first_fb_vc; i <= last_fb_vc; i++) {
                  if (con2fb_map[i] == idx)
                        set_con2fb_map(i, new_idx, 0);
            }
      } else
            ret = fbcon_unbind();

      return ret;
}

static int fbcon_fb_unregistered(struct fb_info *info)
{
      int i, idx = info->node;

      for (i = first_fb_vc; i <= last_fb_vc; i++) {
            if (con2fb_map[i] == idx)
                  con2fb_map[i] = -1;
      }

      if (idx == info_idx) {
            info_idx = -1;

            for (i = 0; i < FB_MAX; i++) {
                  if (registered_fb[i] != NULL) {
                        info_idx = i;
                        break;
                  }
            }
      }

      if (info_idx != -1) {
            for (i = first_fb_vc; i <= last_fb_vc; i++) {
                  if (con2fb_map[i] == -1)
                        con2fb_map[i] = info_idx;
            }
      }

      if (!num_registered_fb)
            unregister_con_driver(&fb_con);


      if (primary_device == idx)
            primary_device = -1;

      return 0;
}

#ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
static void fbcon_select_primary(struct fb_info *info)
{
      if (!map_override && primary_device == -1 &&
          fb_is_primary_device(info)) {
            int i;

            printk(KERN_INFO "fbcon: %s (fb%i) is primary device\n",
                   info->fix.id, info->node);
            primary_device = info->node;

            for (i = first_fb_vc; i <= last_fb_vc; i++)
                  con2fb_map_boot[i] = primary_device;

            if (con_is_bound(&fb_con)) {
                  printk(KERN_INFO "fbcon: Remapping primary device, "
                         "fb%i, to tty %i-%i\n", info->node,
                         first_fb_vc + 1, last_fb_vc + 1);
                  info_idx = primary_device;
            }
      }

}
#else
static inline void fbcon_select_primary(struct fb_info *info)
{
      return;
}
#endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */

static int fbcon_fb_registered(struct fb_info *info)
{
      int ret = 0, i, idx = info->node;

      fbcon_select_primary(info);

      if (info_idx == -1) {
            for (i = first_fb_vc; i <= last_fb_vc; i++) {
                  if (con2fb_map_boot[i] == idx) {
                        info_idx = idx;
                        break;
                  }
            }

            if (info_idx != -1)
                  ret = fbcon_takeover(1);
      } else {
            for (i = first_fb_vc; i <= last_fb_vc; i++) {
                  if (con2fb_map_boot[i] == idx)
                        set_con2fb_map(i, idx, 0);
            }
      }

      return ret;
}

static void fbcon_fb_blanked(struct fb_info *info, int blank)
{
      struct fbcon_ops *ops = info->fbcon_par;
      struct vc_data *vc;

      if (!ops || ops->currcon < 0)
            return;

      vc = vc_cons[ops->currcon].d;
      if (vc->vc_mode != KD_TEXT ||
                  registered_fb[con2fb_map[ops->currcon]] != info)
            return;

      if (CON_IS_VISIBLE(vc)) {
            if (blank)
                  do_blank_screen(0);
            else
                  do_unblank_screen(0);
      }
      ops->blank_state = blank;
}

static void fbcon_new_modelist(struct fb_info *info)
{
      int i;
      struct vc_data *vc;
      struct fb_var_screeninfo var;
      const struct fb_videomode *mode;

      for (i = first_fb_vc; i <= last_fb_vc; i++) {
            if (registered_fb[con2fb_map[i]] != info)
                  continue;
            if (!fb_display[i].mode)
                  continue;
            vc = vc_cons[i].d;
            display_to_var(&var, &fb_display[i]);
            mode = fb_find_nearest_mode(fb_display[i].mode,
                                  &info->modelist);
            fb_videomode_to_var(&var, mode);
            fbcon_set_disp(info, &var, vc->vc_num);
      }
}

static void fbcon_get_requirement(struct fb_info *info,
                          struct fb_blit_caps *caps)
{
      struct vc_data *vc;
      struct display *p;

      if (caps->flags) {
            int i, charcnt;

            for (i = first_fb_vc; i <= last_fb_vc; i++) {
                  vc = vc_cons[i].d;
                  if (vc && vc->vc_mode == KD_TEXT &&
                      info->node == con2fb_map[i]) {
                        p = &fb_display[i];
                        caps->x |= 1 << (vc->vc_font.width - 1);
                        caps->y |= 1 << (vc->vc_font.height - 1);
                        charcnt = (p->userfont) ?
                              FNTCHARCNT(p->fontdata) : 256;
                        if (caps->len < charcnt)
                              caps->len = charcnt;
                  }
            }
      } else {
            vc = vc_cons[fg_console].d;

            if (vc && vc->vc_mode == KD_TEXT &&
                info->node == con2fb_map[fg_console]) {
                  p = &fb_display[fg_console];
                  caps->x = 1 << (vc->vc_font.width - 1);
                  caps->y = 1 << (vc->vc_font.height - 1);
                  caps->len = (p->userfont) ?
                        FNTCHARCNT(p->fontdata) : 256;
            }
      }
}

static int fbcon_event_notify(struct notifier_block *self, 
                        unsigned long action, void *data)
{
      struct fb_event *event = data;
      struct fb_info *info = event->info;
      struct fb_videomode *mode;
      struct fb_con2fbmap *con2fb;
      struct fb_blit_caps *caps;
      int ret = 0;

      /*
       * ignore all events except driver registration and deregistration
       * if fbcon is not active
       */
      if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
                          action == FB_EVENT_FB_UNREGISTERED))
            goto done;

      switch(action) {
      case FB_EVENT_SUSPEND:
            fbcon_suspended(info);
            break;
      case FB_EVENT_RESUME:
            fbcon_resumed(info);
            break;
      case FB_EVENT_MODE_CHANGE:
            fbcon_modechanged(info);
            break;
      case FB_EVENT_MODE_CHANGE_ALL:
            fbcon_set_all_vcs(info);
            break;
      case FB_EVENT_MODE_DELETE:
            mode = event->data;
            ret = fbcon_mode_deleted(info, mode);
            break;
      case FB_EVENT_FB_UNBIND:
            ret = fbcon_fb_unbind(info->node);
            break;
      case FB_EVENT_FB_REGISTERED:
            ret = fbcon_fb_registered(info);
            break;
      case FB_EVENT_FB_UNREGISTERED:
            ret = fbcon_fb_unregistered(info);
            break;
      case FB_EVENT_SET_CONSOLE_MAP:
            con2fb = event->data;
            ret = set_con2fb_map(con2fb->console - 1,
                             con2fb->framebuffer, 1);
            break;
      case FB_EVENT_GET_CONSOLE_MAP:
            con2fb = event->data;
            con2fb->framebuffer = con2fb_map[con2fb->console - 1];
            break;
      case FB_EVENT_BLANK:
            fbcon_fb_blanked(info, *(int *)event->data);
            break;
      case FB_EVENT_NEW_MODELIST:
            fbcon_new_modelist(info);
            break;
      case FB_EVENT_GET_REQ:
            caps = event->data;
            fbcon_get_requirement(info, caps);
            break;
      }

done:
      return ret;
}

/*
 *  The console `switch' structure for the frame buffer based console
 */

static const struct consw fb_con = {
      .owner                  = THIS_MODULE,
      .con_startup            = fbcon_startup,
      .con_init         = fbcon_init,
      .con_deinit             = fbcon_deinit,
      .con_clear        = fbcon_clear,
      .con_putc         = fbcon_putc,
      .con_putcs        = fbcon_putcs,
      .con_cursor             = fbcon_cursor,
      .con_scroll             = fbcon_scroll,
      .con_bmove        = fbcon_bmove,
      .con_switch             = fbcon_switch,
      .con_blank        = fbcon_blank,
      .con_font_set           = fbcon_set_font,
      .con_font_get           = fbcon_get_font,
      .con_font_default = fbcon_set_def_font,
      .con_font_copy          = fbcon_copy_font,
      .con_set_palette  = fbcon_set_palette,
      .con_scrolldelta  = fbcon_scrolldelta,
      .con_set_origin   = fbcon_set_origin,
      .con_invert_region      = fbcon_invert_region,
      .con_screen_pos   = fbcon_screen_pos,
      .con_getxy        = fbcon_getxy,
      .con_resize             = fbcon_resize,
};

static struct notifier_block fbcon_event_notifier = {
      .notifier_call    = fbcon_event_notify,
};

static ssize_t store_rotate(struct device *device,
                      struct device_attribute *attr, const char *buf,
                      size_t count)
{
      struct fb_info *info;
      int rotate, idx;
      char **last = NULL;

      if (fbcon_has_exited)
            return count;

      acquire_console_sem();
      idx = con2fb_map[fg_console];

      if (idx == -1 || registered_fb[idx] == NULL)
            goto err;

      info = registered_fb[idx];
      rotate = simple_strtoul(buf, last, 0);
      fbcon_rotate(info, rotate);
err:
      release_console_sem();
      return count;
}

static ssize_t store_rotate_all(struct device *device,
                        struct device_attribute *attr,const char *buf,
                        size_t count)
{
      struct fb_info *info;
      int rotate, idx;
      char **last = NULL;

      if (fbcon_has_exited)
            return count;

      acquire_console_sem();
      idx = con2fb_map[fg_console];

      if (idx == -1 || registered_fb[idx] == NULL)
            goto err;

      info = registered_fb[idx];
      rotate = simple_strtoul(buf, last, 0);
      fbcon_rotate_all(info, rotate);
err:
      release_console_sem();
      return count;
}

static ssize_t show_rotate(struct device *device,
                     struct device_attribute *attr,char *buf)
{
      struct fb_info *info;
      int rotate = 0, idx;

      if (fbcon_has_exited)
            return 0;

      acquire_console_sem();
      idx = con2fb_map[fg_console];

      if (idx == -1 || registered_fb[idx] == NULL)
            goto err;

      info = registered_fb[idx];
      rotate = fbcon_get_rotate(info);
err:
      release_console_sem();
      return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
}

static ssize_t show_cursor_blink(struct device *device,
                         struct device_attribute *attr, char *buf)
{
      struct fb_info *info;
      struct fbcon_ops *ops;
      int idx, blink = -1;

      if (fbcon_has_exited)
            return 0;

      acquire_console_sem();
      idx = con2fb_map[fg_console];

      if (idx == -1 || registered_fb[idx] == NULL)
            goto err;

      info = registered_fb[idx];
      ops = info->fbcon_par;

      if (!ops)
            goto err;

      blink = (ops->flags & FBCON_FLAGS_CURSOR_TIMER) ? 1 : 0;
err:
      release_console_sem();
      return snprintf(buf, PAGE_SIZE, "%d\n", blink);
}

static ssize_t store_cursor_blink(struct device *device,
                          struct device_attribute *attr,
                          const char *buf, size_t count)
{
      struct fb_info *info;
      int blink, idx;
      char **last = NULL;

      if (fbcon_has_exited)
            return count;

      acquire_console_sem();
      idx = con2fb_map[fg_console];

      if (idx == -1 || registered_fb[idx] == NULL)
            goto err;

      info = registered_fb[idx];

      if (!info->fbcon_par)
            goto err;

      blink = simple_strtoul(buf, last, 0);

      if (blink) {
            fbcon_cursor_noblink = 0;
            fbcon_add_cursor_timer(info);
      } else {
            fbcon_cursor_noblink = 1;
            fbcon_del_cursor_timer(info);
      }

err:
      release_console_sem();
      return count;
}

static struct device_attribute device_attrs[] = {
      __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
      __ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
      __ATTR(cursor_blink, S_IRUGO|S_IWUSR, show_cursor_blink,
             store_cursor_blink),
};

static int fbcon_init_device(void)
{
      int i, error = 0;

      fbcon_has_sysfs = 1;

      for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
            error = device_create_file(fbcon_device, &device_attrs[i]);

            if (error)
                  break;
      }

      if (error) {
            while (--i >= 0)
                  device_remove_file(fbcon_device, &device_attrs[i]);

            fbcon_has_sysfs = 0;
      }

      return 0;
}

static void fbcon_start(void)
{
      if (num_registered_fb) {
            int i;

            acquire_console_sem();

            for (i = 0; i < FB_MAX; i++) {
                  if (registered_fb[i] != NULL) {
                        info_idx = i;
                        break;
                  }
            }

            release_console_sem();
            fbcon_takeover(0);
      }
}

static void fbcon_exit(void)
{
      struct fb_info *info;
      int i, j, mapped;

      if (fbcon_has_exited)
            return;

#ifdef CONFIG_ATARI
      free_irq(IRQ_AUTO_4, fb_vbl_handler);
#endif
#ifdef CONFIG_MAC
      if (MACH_IS_MAC && vbl_detected)
            free_irq(IRQ_MAC_VBL, fb_vbl_handler);
#endif

      kfree((void *)softback_buf);
      softback_buf = 0UL;

      for (i = 0; i < FB_MAX; i++) {
            mapped = 0;
            info = registered_fb[i];

            if (info == NULL)
                  continue;

            for (j = first_fb_vc; j <= last_fb_vc; j++) {
                  if (con2fb_map[j] == i)
                        mapped = 1;
            }

            if (mapped) {
                  if (info->fbops->fb_release)
                        info->fbops->fb_release(info, 0);
                  module_put(info->fbops->owner);

                  if (info->fbcon_par) {
                        struct fbcon_ops *ops = info->fbcon_par;

                        fbcon_del_cursor_timer(info);
                        kfree(ops->cursor_src);
                        kfree(info->fbcon_par);
                        info->fbcon_par = NULL;
                  }

                  if (info->queue.func == fb_flashcursor)
                        info->queue.func = NULL;
            }
      }

      fbcon_has_exited = 1;
}

static int __init fb_console_init(void)
{
      int i;

      acquire_console_sem();
      fb_register_client(&fbcon_event_notifier);
      fbcon_device = device_create(fb_class, NULL, MKDEV(0, 0), "fbcon");

      if (IS_ERR(fbcon_device)) {
            printk(KERN_WARNING "Unable to create device "
                   "for fbcon; errno = %ld\n",
                   PTR_ERR(fbcon_device));
            fbcon_device = NULL;
      } else
            fbcon_init_device();

      for (i = 0; i < MAX_NR_CONSOLES; i++)
            con2fb_map[i] = -1;

      release_console_sem();
      fbcon_start();
      return 0;
}

module_init(fb_console_init);

#ifdef MODULE

static void __exit fbcon_deinit_device(void)
{
      int i;

      if (fbcon_has_sysfs) {
            for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
                  device_remove_file(fbcon_device, &device_attrs[i]);

            fbcon_has_sysfs = 0;
      }
}

static void __exit fb_console_exit(void)
{
      acquire_console_sem();
      fb_unregister_client(&fbcon_event_notifier);
      fbcon_deinit_device();
      device_destroy(fb_class, MKDEV(0, 0));
      fbcon_exit();
      release_console_sem();
      unregister_con_driver(&fb_con);
}     

module_exit(fb_console_exit);

#endif

MODULE_LICENSE("GPL");

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