memory.h

   typedef enum Access
    {
        None        = 0,
        Readable    = 1 << 0,
        Writable    = 1 << 1,
        Executable  = 1 << 2,
        User        = 1 << 3,
        Uncached    = 1 << 4,
        InnerCached = 1 << 5,
        OuterCached = 1 << 6,
        Device      = 1 << 7
    }
    Access;

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来源： https://blog.csdn.net/youzjuer/article/details/99474857