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- #ifndef _ASM_GENERIC_PGTABLE_H
- #define _ASM_GENERIC_PGTABLE_H
-
- #ifndef __HAVE_ARCH_PTEP_ESTABLISH
- /*
- * Establish a new mapping:
- * - flush the old one
- * - update the page tables
- * - inform the TLB about the new one
- *
- * We hold the mm semaphore for reading and vma->vm_mm->page_table_lock.
- *
- * Note: the old pte is known to not be writable, so we don't need to
- * worry about dirty bits etc getting lost.
- */
- #ifndef __HAVE_ARCH_SET_PTE_ATOMIC
- #define ptep_establish(__vma, __address, __ptep, __entry) \
- do { \
- set_pte(__ptep, __entry); \
- flush_tlb_page(__vma, __address); \
- } while (0)
- #else /* __HAVE_ARCH_SET_PTE_ATOMIC */
- #define ptep_establish(__vma, __address, __ptep, __entry) \
- do { \
- set_pte_atomic(__ptep, __entry); \
- flush_tlb_page(__vma, __address); \
- } while (0)
- #endif /* __HAVE_ARCH_SET_PTE_ATOMIC */
- #endif
-
- #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
- /*
- * Largely same as above, but only sets the access flags (dirty,
- * accessed, and writable). Furthermore, we know it always gets set
- * to a "more permissive" setting, which allows most architectures
- * to optimize this.
- */
- #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
- do { \
- set_pte(__ptep, __entry); \
- flush_tlb_page(__vma, __address); \
- } while (0)
- #endif
-
- #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
- static inline int ptep_test_and_clear_young(pte_t *ptep)
- {
- pte_t pte = *ptep;
- if (!pte_young(pte))
- return 0;
- set_pte(ptep, pte_mkold(pte));
- return 1;
- }
- #endif
-
- #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
- #define ptep_clear_flush_young(__vma, __address, __ptep) \
- ({ \
- int __young = ptep_test_and_clear_young(__ptep); \
- if (__young) \
- flush_tlb_page(__vma, __address); \
- __young; \
- })
- #endif
-
- #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
- static inline int ptep_test_and_clear_dirty(pte_t *ptep)
- {
- pte_t pte = *ptep;
- if (!pte_dirty(pte))
- return 0;
- set_pte(ptep, pte_mkclean(pte));
- return 1;
- }
- #endif
-
- #ifndef __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
- #define ptep_clear_flush_dirty(__vma, __address, __ptep) \
- ({ \
- int __dirty = ptep_test_and_clear_dirty(__ptep); \
- if (__dirty) \
- flush_tlb_page(__vma, __address); \
- __dirty; \
- })
- #endif
-
- #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
- static inline pte_t ptep_get_and_clear(pte_t *ptep)
- {
- pte_t pte = *ptep;
- pte_clear(ptep);
- return pte;
- }
- #endif
-
- #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
- #define ptep_clear_flush(__vma, __address, __ptep) \
- ({ \
- pte_t __pte = ptep_get_and_clear(__ptep); \
- flush_tlb_page(__vma, __address); \
- __pte; \
- })
- #endif
-
- #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
- static inline void ptep_set_wrprotect(pte_t *ptep)
- {
- pte_t old_pte = *ptep;
- set_pte(ptep, pte_wrprotect(old_pte));
- }
- #endif
-
- #ifndef __HAVE_ARCH_PTEP_MKDIRTY
- static inline void ptep_mkdirty(pte_t *ptep)
- {
- pte_t old_pte = *ptep;
- set_pte(ptep, pte_mkdirty(old_pte));
- }
- #endif
-
- #ifndef __HAVE_ARCH_PTE_SAME
- #define pte_same(A,B) (pte_val(A) == pte_val(B))
- #endif
-
- #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
- #define page_test_and_clear_dirty(page) (0)
- #endif
-
- #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
- #define page_test_and_clear_young(page) (0)
- #endif
-
- #ifndef __HAVE_ARCH_PGD_OFFSET_GATE
- #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr)
- #endif
-
- #endif /* _ASM_GENERIC_PGTABLE_H */
-