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//0x4 bytes (sizeof)
enum _IOMMU_PASID_SETTING
{
    PasidSettingPreserve = 0,
    PasidSettingEnableAll = 1,
    PasidSettingEnablePasidOnly = 2,
    PasidSettingEnableDefaultOnly = 3,
    PasidSettingDisable = 4,
    PasidSettingMax = 5
};