struct WHEA_PCIX_DEV_VALIDATION_BITS

typedef struct _WHEA_PCIX_DEV_VALIDATION_BITS
{
     ULONG ErrorStatusValid: 1;
     ULONG IdInfoValid: 1;
     ULONG MemoryNumberValid: 1;
     ULONG IoNumberValid: 1;
     ULONG RegisterDataPairValid: 1;
     ULONG Reserved: 59;
} WHEA_PCIX_DEV_VALIDATION_BITS, *PWHEA_PCIX_DEV_VALIDATION_BITS;

Windows Vista Kernel Structures