int do_mappings(void)
{
	int  size_fd;
	int uio_size;
	
	size_fd = open( UIO_SIZE0, O_RDONLY );
	if( size_fd<0 || uio_fd<0 ) {
		fprintf(stderr,"Can't open UIO file 0...\n");
		return -1;
}
	read( size_fd, uio_size_buf, sizeof(uio_size_buf) );
	uio_size = (int)strtol( uio_size_buf, NULL, 0 );
	BAR[0] = (BYTE *)mmap(NULL, uio_size, PROT_READ | PROT_WRITE, MAP_SHARED, uio_fd, 0);
	if(BAR[0] == MAP_FAILED) perror("BAR0:\n");
	close(size_fd);
	
	size_fd = open( UIO_SIZE1, O_RDONLY );
	if( size_fd<0 ) {
		fprintf(stderr,"Can't open UIO file 1...\n");
		return -1;
}
	read( size_fd, uio_size_buf, sizeof(uio_size_buf) );
	uio_size = (int)strtol( uio_size_buf, NULL, 0 );
	BAR[1] = (BYTE *)mmap(NULL, uio_size, PROT_READ | PROT_WRITE, MAP_SHARED, uio_fd, getpagesize());
	close(size_fd);
	
	size_fd = open( UIO_SIZE2, O_RDONLY );
	if( size_fd<0 ) {
		fprintf(stderr,"Can't open UIO file 2...\n");
		return -1;
}
	read( size_fd, uio_size_buf, sizeof(uio_size_buf) );
	uio_size = (int)strtol( uio_size_buf, NULL, 0 );
	BAR[2] = (BYTE *)mmap(NULL, uio_size, PROT_READ | PROT_WRITE, MAP_SHARED, uio_fd, 2*getpagesize());
	close(size_fd);
	return(0);
}