//0x4 bytes (sizeof)
enum _EXT_IOMMU_DEVICE_TYPE
{
EXT_IOMMU_DEVICE_TYPE_INVALID = 0,
EXT_IOMMU_DEVICE_TYPE_PCI = 1,
EXT_IOMMU_DEVICE_TYPE_ACPI = 2,
EXT_IOMMU_DEVICE_TYPE_IOAPIC = 3,
EXT_IOMMU_DEVICE_TYPE_LOGICAL = 4,
EXT_IOMMU_DEVICE_TYPE_GIC = 5,
EXT_IOMMU_DEVICE_TYPE_TEST = 6,
EXT_IOMMU_DEVICE_TYPE_MAX = 7
};