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1 | #ifndef _I386_PGTABLE_3LEVEL_H |
2 | #define _I386_PGTABLE_3LEVEL_H | |
3 | ||
4 | #include <asm-generic/pgtable-nopud.h> | |
5 | ||
6 | /* | |
7 | * Intel Physical Address Extension (PAE) Mode - three-level page | |
8 | * tables on PPro+ CPUs. | |
9 | * | |
10 | * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> | |
11 | */ | |
12 | ||
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)) | |
19 | ||
20 | #define pud_none(pud) 0 | |
21 | #define pud_bad(pud) 0 | |
22 | #define pud_present(pud) 1 | |
23 | ||
24 | /* | |
25 | * Is the pte executable? | |
26 | */ | |
27 | static inline int pte_x(pte_t pte) | |
28 | { | |
29 | return !(pte_val(pte) & _PAGE_NX); | |
30 | } | |
31 | ||
32 | /* | |
33 | * All present user-pages with !NX bit are user-executable: | |
34 | */ | |
35 | static inline int pte_exec(pte_t pte) | |
36 | { | |
37 | return pte_user(pte) && pte_x(pte); | |
38 | } | |
39 | /* | |
40 | * All present pages with !NX bit are kernel-executable: | |
41 | */ | |
42 | static inline int pte_exec_kernel(pte_t pte) | |
43 | { | |
44 | return pte_x(pte); | |
45 | } | |
46 | ||
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 | |
52 | */ | |
53 | static inline void set_pte(pte_t *ptep, pte_t pte) | |
54 | { | |
55 | ptep->pte_high = pte.pte_high; | |
56 | smp_wmb(); | |
57 | ptep->pte_low = pte.pte_low; | |
58 | } | |
59 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) | |
60 | ||
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 | set_64bit((unsigned long long *)(pudptr),pud_val(pudval)) | |
68 | ||
69 | /* | |
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 | |
73 | * this erratum. | |
74 | */ | |
75 | static inline void pud_clear (pud_t * pud) { } | |
76 | ||
77 | #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) | |
78 | ||
79 | #define pmd_page_kernel(pmd) \ | |
80 | ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) | |
81 | ||
82 | #define pud_page(pud) \ | |
83 | ((struct page *) __va(pud_val(pud) & PAGE_MASK)) | |
84 | ||
85 | #define pud_page_kernel(pud) \ | |
86 | ((unsigned long) __va(pud_val(pud) & PAGE_MASK)) | |
87 | ||
88 | ||
89 | /* Find an entry in the second-level page table.. */ | |
90 | #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \ | |
91 | pmd_index(address)) | |
92 | ||
93 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
94 | { | |
95 | pte_t res; | |
96 | ||
97 | /* xchg acts as a barrier before the setting of the high bits */ | |
98 | res.pte_low = xchg(&ptep->pte_low, 0); | |
99 | res.pte_high = ptep->pte_high; | |
100 | ptep->pte_high = 0; | |
101 | ||
102 | return res; | |
103 | } | |
104 | ||
105 | static inline int pte_same(pte_t a, pte_t b) | |
106 | { | |
107 | return a.pte_low == b.pte_low && a.pte_high == b.pte_high; | |
108 | } | |
109 | ||
110 | #define pte_page(x) pfn_to_page(pte_pfn(x)) | |
111 | ||
112 | static inline int pte_none(pte_t pte) | |
113 | { | |
114 | return !pte.pte_low && !pte.pte_high; | |
115 | } | |
116 | ||
117 | static inline unsigned long pte_pfn(pte_t pte) | |
118 | { | |
119 | return (pte.pte_low >> PAGE_SHIFT) | | |
120 | (pte.pte_high << (32 - PAGE_SHIFT)); | |
121 | } | |
122 | ||
123 | extern unsigned long long __supported_pte_mask; | |
124 | ||
125 | static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
126 | { | |
127 | pte_t pte; | |
128 | ||
129 | pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | \ | |
130 | (pgprot_val(pgprot) >> 32); | |
131 | pte.pte_high &= (__supported_pte_mask >> 32); | |
132 | pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)) & \ | |
133 | __supported_pte_mask; | |
134 | return pte; | |
135 | } | |
136 | ||
137 | static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) | |
138 | { | |
139 | return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) | \ | |
140 | pgprot_val(pgprot)) & __supported_pte_mask); | |
141 | } | |
142 | ||
143 | /* | |
144 | * Bits 0, 6 and 7 are taken in the low part of the pte, | |
145 | * put the 32 bits of offset into the high part. | |
146 | */ | |
147 | #define pte_to_pgoff(pte) ((pte).pte_high) | |
148 | #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) | |
149 | #define PTE_FILE_MAX_BITS 32 | |
150 | ||
151 | /* Encode and de-code a swap entry */ | |
152 | #define __swp_type(x) (((x).val) & 0x1f) | |
153 | #define __swp_offset(x) ((x).val >> 5) | |
154 | #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) << 5}) | |
155 | #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high }) | |
156 | #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val }) | |
157 | ||
158 | #define __pmd_free_tlb(tlb, x) do { } while (0) | |
159 | ||
160 | #endif /* _I386_PGTABLE_3LEVEL_H */ |