typedef struct _IMAGE_SECURITY_CONTEXT
{
    union
    {
        void *PageHashes;
        unsigned __int64 Value;
        struct
        {
            unsigned __int64 SecurityBeingCreated : 1;
            unsigned __int64 SecurityMandatory : 1;
            unsigned __int64 Unused : 1;
            unsigned __int64 PageHashPointer : 61;
        };
    };
} IMAGE_SECURITY_CONTEXT, *PIMAGE_SECURITY_CONTEXT;