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      1 #ifndef _ASM_GENERIC_PGTABLE_H
      2 #define _ASM_GENERIC_PGTABLE_H
      3 
      4 #ifndef __HAVE_ARCH_PTEP_ESTABLISH
      5 /*
      6  * Establish a new mapping:
      7  *  - flush the old one
      8  *  - update the page tables
      9  *  - inform the TLB about the new one
     10  *
     11  * We hold the mm semaphore for reading, and the pte lock.
     12  *
     13  * Note: the old pte is known to not be writable, so we don't need to
     14  * worry about dirty bits etc getting lost.
     15  */
     16 #ifndef __HAVE_ARCH_SET_PTE_ATOMIC
     17 #define ptep_establish(__vma, __address, __ptep, __entry)		\
     18 do {				  					\
     19 	set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry);	\
     20 	flush_tlb_page(__vma, __address);				\
     21 } while (0)
     22 #else /* __HAVE_ARCH_SET_PTE_ATOMIC */
     23 #define ptep_establish(__vma, __address, __ptep, __entry)		\
     24 do {				  					\
     25 	set_pte_atomic(__ptep, __entry);				\
     26 	flush_tlb_page(__vma, __address);				\
     27 } while (0)
     28 #endif /* __HAVE_ARCH_SET_PTE_ATOMIC */
     29 #endif
     30 
     31 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
     32 /*
     33  * Largely same as above, but only sets the access flags (dirty,
     34  * accessed, and writable). Furthermore, we know it always gets set
     35  * to a "more permissive" setting, which allows most architectures
     36  * to optimize this.
     37  */
     38 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
     39 do {				  					  \
     40 	set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry);	  \
     41 	flush_tlb_page(__vma, __address);				  \
     42 } while (0)
     43 #endif
     44 
     45 #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
     46 #define ptep_test_and_clear_young(__vma, __address, __ptep)		\
     47 ({									\
     48 	pte_t __pte = *(__ptep);					\
     49 	int r = 1;							\
     50 	if (!pte_young(__pte))						\
     51 		r = 0;							\
     52 	else								\
     53 		set_pte_at((__vma)->vm_mm, (__address),			\
     54 			   (__ptep), pte_mkold(__pte));			\
     55 	r;								\
     56 })
     57 #endif
     58 
     59 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
     60 #define ptep_clear_flush_young(__vma, __address, __ptep)		\
     61 ({									\
     62 	int __young;							\
     63 	__young = ptep_test_and_clear_young(__vma, __address, __ptep);	\
     64 	if (__young)							\
     65 		flush_tlb_page(__vma, __address);			\
     66 	__young;							\
     67 })
     68 #endif
     69 
     70 #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
     71 #define ptep_test_and_clear_dirty(__vma, __address, __ptep)		\
     72 ({									\
     73 	pte_t __pte = *__ptep;						\
     74 	int r = 1;							\
     75 	if (!pte_dirty(__pte))						\
     76 		r = 0;							\
     77 	else								\
     78 		set_pte_at((__vma)->vm_mm, (__address), (__ptep),	\
     79 			   pte_mkclean(__pte));				\
     80 	r;								\
     81 })
     82 #endif
     83 
     84 #ifndef __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
     85 #define ptep_clear_flush_dirty(__vma, __address, __ptep)		\
     86 ({									\
     87 	int __dirty;							\
     88 	__dirty = ptep_test_and_clear_dirty(__vma, __address, __ptep);	\
     89 	if (__dirty)							\
     90 		flush_tlb_page(__vma, __address);			\
     91 	__dirty;							\
     92 })
     93 #endif
     94 
     95 #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
     96 #define ptep_get_and_clear(__mm, __address, __ptep)			\
     97 ({									\
     98 	pte_t __pte = *(__ptep);					\
     99 	pte_clear((__mm), (__address), (__ptep));			\
    100 	__pte;								\
    101 })
    102 #endif
    103 
    104 #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
    105 #define ptep_get_and_clear_full(__mm, __address, __ptep, __full)	\
    106 ({									\
    107 	pte_t __pte;							\
    108 	__pte = ptep_get_and_clear((__mm), (__address), (__ptep));	\
    109 	__pte;								\
    110 })
    111 #endif
    112 
    113 #ifndef __HAVE_ARCH_PTE_CLEAR_FULL
    114 #define pte_clear_full(__mm, __address, __ptep, __full)			\
    115 do {									\
    116 	pte_clear((__mm), (__address), (__ptep));			\
    117 } while (0)
    118 #endif
    119 
    120 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
    121 #define ptep_clear_flush(__vma, __address, __ptep)			\
    122 ({									\
    123 	pte_t __pte;							\
    124 	__pte = ptep_get_and_clear((__vma)->vm_mm, __address, __ptep);	\
    125 	flush_tlb_page(__vma, __address);				\
    126 	__pte;								\
    127 })
    128 #endif
    129 
    130 #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
    131 struct mm_struct;
    132 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
    133 {
    134 	pte_t old_pte = *ptep;
    135 	set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
    136 }
    137 #endif
    138 
    139 #ifndef __HAVE_ARCH_PTE_SAME
    140 #define pte_same(A,B)	(pte_val(A) == pte_val(B))
    141 #endif
    142 
    143 #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
    144 #define page_test_and_clear_dirty(page) (0)
    145 #define pte_maybe_dirty(pte)		pte_dirty(pte)
    146 #else
    147 #define pte_maybe_dirty(pte)		(1)
    148 #endif
    149 
    150 #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
    151 #define page_test_and_clear_young(page) (0)
    152 #endif
    153 
    154 #ifndef __HAVE_ARCH_PGD_OFFSET_GATE
    155 #define pgd_offset_gate(mm, addr)	pgd_offset(mm, addr)
    156 #endif
    157 
    158 #ifndef __HAVE_ARCH_LAZY_MMU_PROT_UPDATE
    159 #define lazy_mmu_prot_update(pte)	do { } while (0)
    160 #endif
    161 
    162 #ifndef __HAVE_ARCH_MOVE_PTE
    163 #define move_pte(pte, prot, old_addr, new_addr)	(pte)
    164 #endif
    165 
    166 /*
    167  * When walking page tables, get the address of the next boundary,
    168  * or the end address of the range if that comes earlier.  Although no
    169  * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.
    170  */
    171 
    172 #define pgd_addr_end(addr, end)						\
    173 ({	unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK;	\
    174 	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
    175 })
    176 
    177 #ifndef pud_addr_end
    178 #define pud_addr_end(addr, end)						\
    179 ({	unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK;	\
    180 	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
    181 })
    182 #endif
    183 
    184 #ifndef pmd_addr_end
    185 #define pmd_addr_end(addr, end)						\
    186 ({	unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK;	\
    187 	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
    188 })
    189 #endif
    190 
    191 #ifndef __ASSEMBLY__
    192 /*
    193  * When walking page tables, we usually want to skip any p?d_none entries;
    194  * and any p?d_bad entries - reporting the error before resetting to none.
    195  * Do the tests inline, but report and clear the bad entry in mm/memory.c.
    196  */
    197 void pgd_clear_bad(pgd_t *);
    198 void pud_clear_bad(pud_t *);
    199 void pmd_clear_bad(pmd_t *);
    200 
    201 static inline int pgd_none_or_clear_bad(pgd_t *pgd)
    202 {
    203 	if (pgd_none(*pgd))
    204 		return 1;
    205 	if (unlikely(pgd_bad(*pgd))) {
    206 		pgd_clear_bad(pgd);
    207 		return 1;
    208 	}
    209 	return 0;
    210 }
    211 
    212 static inline int pud_none_or_clear_bad(pud_t *pud)
    213 {
    214 	if (pud_none(*pud))
    215 		return 1;
    216 	if (unlikely(pud_bad(*pud))) {
    217 		pud_clear_bad(pud);
    218 		return 1;
    219 	}
    220 	return 0;
    221 }
    222 
    223 static inline int pmd_none_or_clear_bad(pmd_t *pmd)
    224 {
    225 	if (pmd_none(*pmd))
    226 		return 1;
    227 	if (unlikely(pmd_bad(*pmd))) {
    228 		pmd_clear_bad(pmd);
    229 		return 1;
    230 	}
    231 	return 0;
    232 }
    233 #endif /* !__ASSEMBLY__ */
    234 
    235 #endif /* _ASM_GENERIC_PGTABLE_H */
    236