typedef struct _LOADER_PARAMETER_EXTENSION
{
     ULONG Size;
     PROFILE_PARAMETER_BLOCK Profile;
     ULONG MajorVersion;
     ULONG MinorVersion;
     PVOID EmInfFileImage;
     ULONG EmInfFileSize;
     PVOID TriageDumpBlock;
     ULONG LoaderPagesSpanned;
     PHEADLESS_LOADER_BLOCK HeadlessLoaderBlock;
     _SMBIOS_TABLE_HEADER * SMBiosEPSHeader;
     PVOID DrvDBImage;
     ULONG DrvDBSize;
     PNETWORK_LOADER_BLOCK NetworkLoaderBlock;
     UCHAR * HalpIRQLToTPR;
     UCHAR * HalpVectorToIRQL;
     LIST_ENTRY FirmwareDescriptorListHead;
     PVOID AcpiTable;
     ULONG AcpiTableSize;
     ULONG BootViaWinload: 1;
     ULONG Reserved: 31;
     PLOADER_PERFORMANCE_DATA LoaderPerformanceData;
     LIST_ENTRY BootApplicationPersistentData;
     PVOID WmdTestResult;
     GUID BootIdentifier;
} LOADER_PARAMETER_EXTENSION, *PLOADER_PARAMETER_EXTENSION;

Windows Vista Kernel Structures