typedef enum
{
    IoPagingPriorityInvalid = 0,
    IoPagingPriorityNormal = 1,
    IoPagingPriorityHigh = 2,
    IoPagingPriorityReserved1 = 3,
    IoPagingPriorityReserved2 = 4
} IO_PAGING_PRIORITY;