#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <strings.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <machine/fbio.h>

extern const char *__progname;

static const char *devpath = "/dev/bwtwo0";
static int fd;
static unsigned char *vram;
static int size;

static void setup(void)
{
 void *mrv;
 struct fbtype t;

 fd = open(devpath,O_RDWR,0);
 if (fd < 0)
  { fprintf(stderr,"%s: %s: %s\n",__progname,devpath,strerror(errno));
    exit(1);
  }
 if ( (ioctl(fd,FBIOGTYPE,&t) < 0) ||
      (t.fb_type != FBTYPE_SUN2BW) ||
      (t.fb_depth != 1) )
  { close(fd);
    fprintf(stderr,"%s: %s: not a bw2\n",__progname,devpath);
    exit(1);
  }
 mrv = mmap(0,t.fb_size,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
 if (mrv == MAP_FAILED)
  { fprintf(stderr,"%s: can't mmap %s: %s\n",__progname,devpath,strerror(errno));
    exit(1);
  }
 vram = mrv;
 size = t.fb_size;
}

static void fillfb(void)
{
 memset(vram,~0,size);
}

int main(void);
int main(void)
{
 setup();
 fillfb();
 exit(0);
}