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//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
};