union _IOMMU_INTERFACE_STATE_CHANGE_FIELDS// Size=0x4
{
    unsigned long AvailableDomainTypes:1;// Offset=0x0 Size=0x4 BitOffset=0x0 BitSize=0x1
    unsigned long Reserved:31;// Offset=0x0 Size=0x4 BitOffset=0x1 BitSize=0x1f
    unsigned long AsULONG;// Offset=0x0 Size=0x4
};