1 #ifndef _I386_PGTABLE_3LEVEL_H
2 #define _I386_PGTABLE_3LEVEL_H
4 #include <asm-generic/pgtable-nopud.h>
7 * Intel Physical Address Extension (PAE) Mode - three-level page
8 * tables on PPro+ CPUs.
10 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
13 #define pte_ERROR(e) \
14 printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, &(e), (e).pte_high, (e).pte_low)
15 #define pmd_ERROR(e) \
16 printk("%s:%d: bad pmd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
17 #define pgd_ERROR(e) \
18 printk("%s:%d: bad pgd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
20 #define pud_none(pud) 0
21 #define pud_bad(pud) 0
22 #define pud_present(pud) 1
25 * Is the pte executable?
27 static inline int pte_x(pte_t pte)
29 return !(pte_val(pte) & _PAGE_NX);
33 * All present user-pages with !NX bit are user-executable:
35 static inline int pte_exec(pte_t pte)
37 return pte_user(pte) && pte_x(pte);
40 * All present pages with !NX bit are kernel-executable:
42 static inline int pte_exec_kernel(pte_t pte)
47 /* Rules for using set_pte: the pte being assigned *must* be
48 * either not present or in a state where the hardware will
49 * not attempt to update the pte. In places where this is
50 * not possible, use pte_get_and_clear to obtain the old pte
51 * value and then use set_pte to update it. -ben
53 static inline void set_pte(pte_t *ptep, pte_t pte)
55 ptep->pte_high = pte.pte_high;
57 ptep->pte_low = pte.pte_low;
59 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
61 #define __HAVE_ARCH_SET_PTE_ATOMIC
62 #define set_pte_atomic(pteptr,pteval) \
63 set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
64 #define set_pmd(pmdptr,pmdval) \
65 set_64bit((unsigned long long *)(pmdptr),pmd_val(pmdval))
66 #define set_pud(pudptr,pudval) \
67 (*(pudptr) = (pudval))
70 * Pentium-II erratum A13: in PAE mode we explicitly have to flush
71 * the TLB via cr3 if the top-level pgd is changed...
72 * We do not let the generic code free and clear pgd entries due to
75 static inline void pud_clear (pud_t * pud) { }
77 #define pud_page(pud) \
78 ((struct page *) __va(pud_val(pud) & PAGE_MASK))
80 #define pud_page_kernel(pud) \
81 ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
84 /* Find an entry in the second-level page table.. */
85 #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
88 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
92 /* xchg acts as a barrier before the setting of the high bits */
93 res.pte_low = xchg(&ptep->pte_low, 0);
94 res.pte_high = ptep->pte_high;
100 static inline int pte_same(pte_t a, pte_t b)
102 return a.pte_low == b.pte_low && a.pte_high == b.pte_high;
105 #define pte_page(x) pfn_to_page(pte_pfn(x))
107 static inline int pte_none(pte_t pte)
109 return !pte.pte_low && !pte.pte_high;
112 static inline unsigned long pte_pfn(pte_t pte)
114 return (pte.pte_low >> PAGE_SHIFT) |
115 (pte.pte_high << (32 - PAGE_SHIFT));
118 extern unsigned long long __supported_pte_mask;
120 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
124 pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | \
125 (pgprot_val(pgprot) >> 32);
126 pte.pte_high &= (__supported_pte_mask >> 32);
127 pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)) & \
128 __supported_pte_mask;
132 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
134 return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) | \
135 pgprot_val(pgprot)) & __supported_pte_mask);
139 * Bits 0, 6 and 7 are taken in the low part of the pte,
140 * put the 32 bits of offset into the high part.
142 #define pte_to_pgoff(pte) ((pte).pte_high)
143 #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
144 #define PTE_FILE_MAX_BITS 32
146 /* Encode and de-code a swap entry */
147 #define __swp_type(x) (((x).val) & 0x1f)
148 #define __swp_offset(x) ((x).val >> 5)
149 #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) << 5})
150 #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high })
151 #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val })
153 #define __pmd_free_tlb(tlb, x) do { } while (0)
155 #endif /* _I386_PGTABLE_3LEVEL_H */