244 lines
6.3 KiB
C
244 lines
6.3 KiB
C
#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_at((__vma)->vm_mm, (__address), __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_at((__vma)->vm_mm, (__address), __ptep, __entry); \
|
|
flush_tlb_page(__vma, __address); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
|
|
#define ptep_test_and_clear_young(__vma, __address, __ptep) \
|
|
({ \
|
|
pte_t __pte = *(__ptep); \
|
|
int r = 1; \
|
|
if (!pte_young(__pte)) \
|
|
r = 0; \
|
|
else \
|
|
set_pte_at((__vma)->vm_mm, (__address), \
|
|
(__ptep), pte_mkold(__pte)); \
|
|
r; \
|
|
})
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
|
|
#define ptep_clear_flush_young(__vma, __address, __ptep) \
|
|
({ \
|
|
int __young; \
|
|
__young = ptep_test_and_clear_young(__vma, __address, __ptep); \
|
|
if (__young) \
|
|
flush_tlb_page(__vma, __address); \
|
|
__young; \
|
|
})
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
|
|
#define ptep_test_and_clear_dirty(__vma, __address, __ptep) \
|
|
({ \
|
|
pte_t __pte = *__ptep; \
|
|
int r = 1; \
|
|
if (!pte_dirty(__pte)) \
|
|
r = 0; \
|
|
else \
|
|
set_pte_at((__vma)->vm_mm, (__address), (__ptep), \
|
|
pte_mkclean(__pte)); \
|
|
r; \
|
|
})
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
|
|
#define ptep_clear_flush_dirty(__vma, __address, __ptep) \
|
|
({ \
|
|
int __dirty; \
|
|
__dirty = ptep_test_and_clear_dirty(__vma, __address, __ptep); \
|
|
if (__dirty) \
|
|
flush_tlb_page(__vma, __address); \
|
|
__dirty; \
|
|
})
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
|
|
#define ptep_get_and_clear(__mm, __address, __ptep) \
|
|
({ \
|
|
pte_t __pte = *(__ptep); \
|
|
pte_clear((__mm), (__address), (__ptep)); \
|
|
__pte; \
|
|
})
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
|
|
#define ptep_get_and_clear_full(__mm, __address, __ptep, __full) \
|
|
({ \
|
|
pte_t __pte; \
|
|
__pte = ptep_get_and_clear((__mm), (__address), (__ptep)); \
|
|
__pte; \
|
|
})
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTE_CLEAR_FULL
|
|
#define pte_clear_full(__mm, __address, __ptep, __full) \
|
|
do { \
|
|
pte_clear((__mm), (__address), (__ptep)); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
|
|
#define ptep_clear_flush(__vma, __address, __ptep) \
|
|
({ \
|
|
pte_t __pte; \
|
|
__pte = ptep_get_and_clear((__vma)->vm_mm, __address, __ptep); \
|
|
flush_tlb_page(__vma, __address); \
|
|
__pte; \
|
|
})
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
|
|
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
|
|
{
|
|
pte_t old_pte = *ptep;
|
|
set_pte_at(mm, address, ptep, pte_wrprotect(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)
|
|
#define pte_maybe_dirty(pte) pte_dirty(pte)
|
|
#else
|
|
#define pte_maybe_dirty(pte) (1)
|
|
#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
|
|
|
|
#ifndef __HAVE_ARCH_LAZY_MMU_PROT_UPDATE
|
|
#define lazy_mmu_prot_update(pte) do { } while (0)
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_MULTIPLE_ZERO_PAGE
|
|
#define move_pte(pte, prot, old_addr, new_addr) (pte)
|
|
#else
|
|
#define move_pte(pte, prot, old_addr, new_addr) \
|
|
({ \
|
|
pte_t newpte = (pte); \
|
|
if (pte_present(pte) && pfn_valid(pte_pfn(pte)) && \
|
|
pte_page(pte) == ZERO_PAGE(old_addr)) \
|
|
newpte = mk_pte(ZERO_PAGE(new_addr), (prot)); \
|
|
newpte; \
|
|
})
|
|
#endif
|
|
|
|
/*
|
|
* When walking page tables, get the address of the next boundary,
|
|
* or the end address of the range if that comes earlier. Although no
|
|
* vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.
|
|
*/
|
|
|
|
#define pgd_addr_end(addr, end) \
|
|
({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
|
|
(__boundary - 1 < (end) - 1)? __boundary: (end); \
|
|
})
|
|
|
|
#ifndef pud_addr_end
|
|
#define pud_addr_end(addr, end) \
|
|
({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \
|
|
(__boundary - 1 < (end) - 1)? __boundary: (end); \
|
|
})
|
|
#endif
|
|
|
|
#ifndef pmd_addr_end
|
|
#define pmd_addr_end(addr, end) \
|
|
({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \
|
|
(__boundary - 1 < (end) - 1)? __boundary: (end); \
|
|
})
|
|
#endif
|
|
|
|
#ifndef __ASSEMBLY__
|
|
/*
|
|
* When walking page tables, we usually want to skip any p?d_none entries;
|
|
* and any p?d_bad entries - reporting the error before resetting to none.
|
|
* Do the tests inline, but report and clear the bad entry in mm/memory.c.
|
|
*/
|
|
void pgd_clear_bad(pgd_t *);
|
|
void pud_clear_bad(pud_t *);
|
|
void pmd_clear_bad(pmd_t *);
|
|
|
|
static inline int pgd_none_or_clear_bad(pgd_t *pgd)
|
|
{
|
|
if (pgd_none(*pgd))
|
|
return 1;
|
|
if (unlikely(pgd_bad(*pgd))) {
|
|
pgd_clear_bad(pgd);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int pud_none_or_clear_bad(pud_t *pud)
|
|
{
|
|
if (pud_none(*pud))
|
|
return 1;
|
|
if (unlikely(pud_bad(*pud))) {
|
|
pud_clear_bad(pud);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int pmd_none_or_clear_bad(pmd_t *pmd)
|
|
{
|
|
if (pmd_none(*pmd))
|
|
return 1;
|
|
if (unlikely(pmd_bad(*pmd))) {
|
|
pmd_clear_bad(pmd);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* _ASM_GENERIC_PGTABLE_H */
|