typedef union _WHEA_ERROR_RECORD_HEADER_VALIDBITS
{
    struct
    {
        unsigned long PlatformId : 1;
        unsigned long Timestamp : 1;
        unsigned long PartitionId : 1;
        unsigned long Reserved : 29;
    };
    unsigned long AsULONG;
} WHEA_ERROR_RECORD_HEADER_VALIDBITS, *PWHEA_ERROR_RECORD_HEADER_VALIDBITS;