typedef union _XALLOC_ATTRIBUTES {  
    ULONGLONG Attributes;  
    struct {  
        ULONGLONG ObjectType : 14;  
        ULONGLONG PageSize : 2;  
        ULONGLONG AllocatorId : 8;  
        ULONGLONG Alignment : 5;  
        ULONGLONG MemoryType : 4;  
        ULONGLONG Address32BitMapping : 1;  
        ULONGLONG reserved : 30;  
    } s;  
} XALLOC_ATTRIBUTES, *PXALLOC_ATTRIBUTES;