1 #ifndef _I386_PGTABLE_3LEVEL_H
2 #define _I386_PGTABLE_3LEVEL_H
5 * Intel Physical Address Extension (PAE) Mode - three-level page
6 * tables on PPro+ CPUs.
8 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
11 #define pte_ERROR(e) \
12 printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, &(e), (e).pte_high, (e).pte_low)
13 #define pmd_ERROR(e) \
14 printk("%s:%d: bad pmd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
15 #define pgd_ERROR(e) \
16 printk("%s:%d: bad pgd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
18 #define pud_none(pud) 0
19 #define pud_bad(pud) 0
20 #define pud_present(pud) 1
23 * All present pages with !NX bit are kernel-executable:
25 static inline int pte_exec_kernel(pte_t pte)
27 return !(pte_val(pte) & _PAGE_NX);
30 /* Rules for using set_pte: the pte being assigned *must* be
31 * either not present or in a state where the hardware will
32 * not attempt to update the pte. In places where this is
33 * not possible, use pte_get_and_clear to obtain the old pte
34 * value and then use set_pte to update it. -ben
36 static inline void native_set_pte(pte_t *ptep, pte_t pte)
38 ptep->pte_high = pte.pte_high;
40 ptep->pte_low = pte.pte_low;
44 * Since this is only called on user PTEs, and the page fault handler
45 * must handle the already racy situation of simultaneous page faults,
46 * we are justified in merely clearing the PTE present bit, followed
47 * by a set. The ordering here is important.
49 static inline void native_set_pte_present(struct mm_struct *mm, unsigned long addr,
50 pte_t *ptep, pte_t pte)
54 ptep->pte_high = pte.pte_high;
56 ptep->pte_low = pte.pte_low;
59 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
61 set_64bit((unsigned long long *)(ptep),native_pte_val(pte));
63 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
65 set_64bit((unsigned long long *)(pmdp),native_pmd_val(pmd));
67 static inline void native_set_pud(pud_t *pudp, pud_t pud)
73 * For PTEs and PDEs, we must clear the P-bit first when clearing a page table
74 * entry, so clear the bottom half first and enforce ordering with a compiler
77 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
84 static inline void native_pmd_clear(pmd_t *pmd)
86 u32 *tmp = (u32 *)pmd;
93 * Pentium-II erratum A13: in PAE mode we explicitly have to flush
94 * the TLB via cr3 if the top-level pgd is changed...
95 * We do not let the generic code free and clear pgd entries due to
98 static inline void pud_clear (pud_t * pud) { }
100 #define pud_page(pud) \
101 ((struct page *) __va(pud_val(pud) & PAGE_MASK))
103 #define pud_page_vaddr(pud) \
104 ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
107 /* Find an entry in the second-level page table.. */
108 #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
112 static inline pte_t native_ptep_get_and_clear(pte_t *ptep)
116 /* xchg acts as a barrier before the setting of the high bits */
117 res.pte_low = xchg(&ptep->pte_low, 0);
118 res.pte_high = ptep->pte_high;
124 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
127 #define __HAVE_ARCH_PTE_SAME
128 static inline int pte_same(pte_t a, pte_t b)
130 return a.pte_low == b.pte_low && a.pte_high == b.pte_high;
133 #define pte_page(x) pfn_to_page(pte_pfn(x))
135 static inline int pte_none(pte_t pte)
137 return !pte.pte_low && !pte.pte_high;
140 static inline unsigned long pte_pfn(pte_t pte)
142 return (pte_val(pte) & ~_PAGE_NX) >> PAGE_SHIFT;
146 * Bits 0, 6 and 7 are taken in the low part of the pte,
147 * put the 32 bits of offset into the high part.
149 #define pte_to_pgoff(pte) ((pte).pte_high)
150 #define pgoff_to_pte(off) ((pte_t) { { .pte_low = _PAGE_FILE, .pte_high = (off) } })
151 #define PTE_FILE_MAX_BITS 32
153 /* Encode and de-code a swap entry */
154 #define __swp_type(x) (((x).val) & 0x1f)
155 #define __swp_offset(x) ((x).val >> 5)
156 #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) << 5})
157 #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high })
158 #define __swp_entry_to_pte(x) ((pte_t){ { .pte_high = (x).val } })
160 #endif /* _I386_PGTABLE_3LEVEL_H */