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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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/*
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struct page_operations {
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 * This is the generic 4-level page table interface.
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    void (* mapping_insert)(__address page, __address frame, int flags, __address root);
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 * Architectures are supposed to implement *_ARCH macros.
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    pte_t *(* mapping_find)(__address page, __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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/*
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 * These macros process vaddr and extract those portions
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 * of it that function as indices to respective page tables.
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 */
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#define PTL0_INDEX(vaddr)       PTL0_INDEX_ARCH(vaddr)
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#define PTL1_INDEX(vaddr)       PTL1_INDEX_ARCH(vaddr)
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#define PTL2_INDEX(vaddr)       PTL2_INDEX_ARCH(vaddr)
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#define PTL3_INDEX(vaddr)       PTL3_INDEX_ARCH(vaddr)
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#define GET_PTL0_ADDRESS()      GET_PTL0_ADDRESS_ARCH()
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#define SET_PTL0_ADDRESS(ptl0)      SET_PTL0_ADDRESS_ARCH(ptl0)
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/*
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 * These macros traverse the 4-level tree of page tables,
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 * each descending by one level.
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 */
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#define GET_PTL1_ADDRESS(ptl0, i)   GET_PTL1_ADDRESS_ARCH(ptl0, i)
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#define GET_PTL2_ADDRESS(ptl1, i)   GET_PTL2_ADDRESS_ARCH(ptl1, i)
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#define GET_PTL3_ADDRESS(ptl2, i)   GET_PTL3_ADDRESS_ARCH(ptl2, i)
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#define GET_FRAME_ADDRESS(ptl3, i)  GET_FRAME_ADDRESS_ARCH(ptl3, i)
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/*
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 * These macros are provided to change shape of the 4-level
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 * tree of page tables on respective level.
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extern page_operations_t *page_operations;
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 */
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#define SET_PTL1_ADDRESS(ptl0, i, a)    SET_PTL1_ADDRESS_ARCH(ptl0, i, a)
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#define SET_PTL2_ADDRESS(ptl1, i, a)    SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
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#define SET_PTL3_ADDRESS(ptl2, i, a)    SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
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#define SET_FRAME_ADDRESS(ptl3, i, a)   SET_FRAME_ADDRESS_ARCH(ptl3, i, a)
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/*
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 * These macros are provided to query various flags within the page tables.
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 */
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#define GET_PTL1_FLAGS(ptl0, i)     GET_PTL1_FLAGS_ARCH(ptl0, i)
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#define GET_PTL2_FLAGS(ptl1, i)     GET_PTL2_FLAGS_ARCH(ptl1, i)
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#define GET_PTL3_FLAGS(ptl2, i)     GET_PTL3_FLAGS_ARCH(ptl2, i)
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#define GET_FRAME_FLAGS(ptl3, i)    GET_FRAME_FLAGS_ARCH(ptl3, i)
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/*
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 * These macros are provided to set/clear various flags within the page tables.
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 */
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#define SET_PTL1_FLAGS(ptl0, i, x)  SET_PTL1_FLAGS_ARCH(ptl0, i, x)
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#define SET_PTL2_FLAGS(ptl1, i, x)  SET_PTL2_FLAGS_ARCH(ptl1, i, x)
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#define SET_PTL3_FLAGS(ptl2, i, x)  SET_PTL3_FLAGS_ARCH(ptl2, i, x)
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#define SET_FRAME_FLAGS(ptl3, i, x) SET_FRAME_FLAGS_ARCH(ptl3, i, x)
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extern void page_init(void);
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extern void page_init(void);
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extern void page_mapping_insert(__address page, __address frame, int flags, __address root);
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extern void page_mapping_insert(__address page, __address frame, int flags, __address root);
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extern pte_t *page_mapping_find(__address page, __address root);
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extern pte_t *page_mapping_find(__address page, __address root);
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extern void map_structure(__address s, size_t size);
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extern void map_structure(__address s, size_t size);