typedef struct _WHEA_PCIX_BUS_ERROR
{
     WHEA_PCIX_BUS_VALIDATION_BITS ValidationBits;
     WHEA_ERROR_STATUS ErrorStatus;
     WORD ErrorType;
     WORD BusId;
     ULONG Reserved;
     UINT64 BusAddress;
     UINT64 BusData;
     UINT64 BusCommand;
     UINT64 BusRequestorId;
     UINT64 BusCompleterId;
     UINT64 TargetId;
} WHEA_PCIX_BUS_ERROR, *PWHEA_PCIX_BUS_ERROR;

Windows Vista Kernel Structures