int fp_mul(int a, int b)
{
    u_fixed_point   result;
    long int ta = a < 0 ? a * -1: a;
    long int tb = b < 0 ? b * -1: b;
    long int res = ta * tb;

    result.value = res >> 16;

    result.value = ((result.value << 1) >> 1);
    if ((a <0 && b>=0) || (a>=0 && b<0))
        result.fp.integer *= -1;
    return (result.value);
}