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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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#define PAGE_GLOBAL     (1<<PAGE_GLOBAL_SHIFT)
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/** Operations to manipulate page mappings. */
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/** Operations to manipulate page mappings. */
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struct page_operations {
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struct page_mapping_operations {
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    void (* mapping_insert)(as_t *as, __address page, __address frame, int flags);
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    void (* mapping_insert)(as_t *as, __address page, __address frame, int flags);
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    pte_t *(* mapping_find)(as_t *as, __address page);
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    pte_t *(* mapping_find)(as_t *as, __address page);
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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_mapping_operations page_mapping_operations_t;
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extern page_operations_t *page_operations;
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extern page_mapping_operations_t *page_mapping_operations;
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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(as_t *as, __address page, __address frame, int flags);
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extern void page_mapping_insert(as_t *as, __address page, __address frame, int flags);
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extern pte_t *page_mapping_find(as_t *as, __address page);
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extern pte_t *page_mapping_find(as_t *as, __address page);
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extern pte_t *page_table_create(int flags);
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extern pte_t *page_table_create(int flags);