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- #ifndef _I386_PGTABLE_3LEVEL_H
- #define _I386_PGTABLE_3LEVEL_H
-
- #include <asm-generic/pgtable-nopud.h>
-
- /*
- * Intel Physical Address Extension (PAE) Mode - three-level page
- * tables on PPro+ CPUs.
- *
- * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
- */
-
- #define pte_ERROR(e) \
- printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, &(e), (e).pte_high, (e).pte_low)
- #define pmd_ERROR(e) \
- printk("%s:%d: bad pmd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
- #define pgd_ERROR(e) \
- printk("%s:%d: bad pgd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
-
- #define pud_none(pud) 0
- #define pud_bad(pud) 0
- #define pud_present(pud) 1
-
- /*
- * Is the pte executable?
- */
- static inline int pte_x(pte_t pte)
- {
- return !(pte_val(pte) & _PAGE_NX);
- }
-
- /*
- * All present user-pages with !NX bit are user-executable:
- */
- static inline int pte_exec(pte_t pte)
- {
- return pte_user(pte) && pte_x(pte);
- }
- /*
- * All present pages with !NX bit are kernel-executable:
- */
- static inline int pte_exec_kernel(pte_t pte)
- {
- return pte_x(pte);
- }
-
- /* Rules for using set_pte: the pte being assigned *must* be
- * either not present or in a state where the hardware will
- * not attempt to update the pte. In places where this is
- * not possible, use pte_get_and_clear to obtain the old pte
- * value and then use set_pte to update it. -ben
- */
- static inline void set_pte(pte_t *ptep, pte_t pte)
- {
- ptep->pte_high = pte.pte_high;
- smp_wmb();
- ptep->pte_low = pte.pte_low;
- }
- #define __HAVE_ARCH_SET_PTE_ATOMIC
- #define set_pte_atomic(pteptr,pteval) \
- set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
- #define set_pmd(pmdptr,pmdval) \
- set_64bit((unsigned long long *)(pmdptr),pmd_val(pmdval))
- #define set_pud(pudptr,pudval) \
- set_64bit((unsigned long long *)(pudptr),pud_val(pudval))
-
- /*
- * Pentium-II erratum A13: in PAE mode we explicitly have to flush
- * the TLB via cr3 if the top-level pgd is changed...
- * We do not let the generic code free and clear pgd entries due to
- * this erratum.
- */
- static inline void pud_clear (pud_t * pud) { }
-
- #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
-
- #define pmd_page_kernel(pmd) \
- ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
-
- #define pud_page(pud) \
- ((struct page *) __va(pud_val(pud) & PAGE_MASK))
-
- #define pud_page_kernel(pud) \
- ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
-
-
- /* Find an entry in the second-level page table.. */
- #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
- pmd_index(address))
-
- static inline pte_t ptep_get_and_clear(pte_t *ptep)
- {
- pte_t res;
-
- /* xchg acts as a barrier before the setting of the high bits */
- res.pte_low = xchg(&ptep->pte_low, 0);
- res.pte_high = ptep->pte_high;
- ptep->pte_high = 0;
-
- return res;
- }
-
- static inline int pte_same(pte_t a, pte_t b)
- {
- return a.pte_low == b.pte_low && a.pte_high == b.pte_high;
- }
-
- #define pte_page(x) pfn_to_page(pte_pfn(x))
-
- static inline int pte_none(pte_t pte)
- {
- return !pte.pte_low && !pte.pte_high;
- }
-
- static inline unsigned long pte_pfn(pte_t pte)
- {
- return (pte.pte_low >> PAGE_SHIFT) |
- (pte.pte_high << (32 - PAGE_SHIFT));
- }
-
- extern unsigned long long __supported_pte_mask;
-
- static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
- {
- pte_t pte;
-
- pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | \
- (pgprot_val(pgprot) >> 32);
- pte.pte_high &= (__supported_pte_mask >> 32);
- pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)) & \
- __supported_pte_mask;
- return pte;
- }
-
- static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
- {
- return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) | \
- pgprot_val(pgprot)) & __supported_pte_mask);
- }
-
- /*
- * Bits 0, 6 and 7 are taken in the low part of the pte,
- * put the 32 bits of offset into the high part.
- */
- #define pte_to_pgoff(pte) ((pte).pte_high)
- #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
- #define PTE_FILE_MAX_BITS 32
-
- /* Encode and de-code a swap entry */
- #define __swp_type(x) (((x).val) & 0x1f)
- #define __swp_offset(x) ((x).val >> 5)
- #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) << 5})
- #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high })
- #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val })
-
- #define __pmd_free_tlb(tlb, x) do { } while (0)
-
- #endif /* _I386_PGTABLE_3LEVEL_H */
-