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#define PAGE_USER_SHIFT         2
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#define PAGE_USER_SHIFT         2
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#define PAGE_KERNEL_SHIFT       PAGE_USER_SHIFT
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#define PAGE_KERNEL_SHIFT       PAGE_USER_SHIFT
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#define PAGE_READ_SHIFT         3
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#define PAGE_READ_SHIFT         3
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#define PAGE_WRITE_SHIFT        4
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#define PAGE_WRITE_SHIFT        4
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#define PAGE_EXEC_SHIFT         5
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#define PAGE_EXEC_SHIFT         5
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#define PAGE_GLOBAL_SHIFT       6
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#define PAGE_NOT_CACHEABLE  (0<<PAGE_CACHEABLE_SHIFT)
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#define PAGE_NOT_CACHEABLE  (0<<PAGE_CACHEABLE_SHIFT)
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#define PAGE_CACHEABLE      (1<<PAGE_CACHEABLE_SHIFT)
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#define PAGE_CACHEABLE      (1<<PAGE_CACHEABLE_SHIFT)
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#define PAGE_PRESENT        (0<<PAGE_PRESENT_SHIFT)
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#define PAGE_PRESENT        (0<<PAGE_PRESENT_SHIFT)
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#define PAGE_READ       (1<<PAGE_READ_SHIFT)
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#define PAGE_READ       (1<<PAGE_READ_SHIFT)
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#define PAGE_WRITE      (1<<PAGE_WRITE_SHIFT)
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#define PAGE_WRITE      (1<<PAGE_WRITE_SHIFT)
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#define PAGE_EXEC       (1<<PAGE_EXEC_SHIFT)
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#define PAGE_EXEC       (1<<PAGE_EXEC_SHIFT)
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#define PAGE_GLOBAL     (1<<PAGE_GLOBAL_SHIFT)
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/** Operations to manipulate page mappings. */
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struct page_operations {
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struct page_operations {
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    void (* mapping_insert)(__address page, asid_t asid, __address frame, int flags, __address root);
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    void (* mapping_insert)(__address page, asid_t asid, __address frame, int flags, __address root);
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    pte_t *(* mapping_find)(__address page, asid_t asid, __address root);
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    pte_t *(* mapping_find)(__address page, asid_t asid, __address root);
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};
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};
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typedef struct page_operations page_operations_t;
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typedef struct page_operations page_operations_t;