diff options
Diffstat (limited to 'linux-2.6.9-xen-sparse/include/asm-generic/pgtable.h')
| -rw-r--r-- | linux-2.6.9-xen-sparse/include/asm-generic/pgtable.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/linux-2.6.9-xen-sparse/include/asm-generic/pgtable.h b/linux-2.6.9-xen-sparse/include/asm-generic/pgtable.h new file mode 100644 index 0000000000..59563e99c7 --- /dev/null +++ b/linux-2.6.9-xen-sparse/include/asm-generic/pgtable.h @@ -0,0 +1,144 @@ +#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_ESTABLISH_NEW +#define ptep_establish_new(__vma, __address, __ptep, __entry) \ +do { \ + set_pte(__ptep, __entry); \ +} 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 */ |