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1965aae3 PA |
1 | #ifndef _ASM_X86_PGTABLE_3LEVEL_H |
2 | #define _ASM_X86_PGTABLE_3LEVEL_H | |
1da177e4 | 3 | |
1da177e4 LT |
4 | /* |
5 | * Intel Physical Address Extension (PAE) Mode - three-level page | |
6 | * tables on PPro+ CPUs. | |
7 | * | |
8 | * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> | |
9 | */ | |
10 | ||
4b01fef8 JP |
11 | #define pte_ERROR(e) \ |
12 | printk("%s:%d: bad pte %p(%08lx%08lx).\n", \ | |
13 | __FILE__, __LINE__, &(e), (e).pte_high, (e).pte_low) | |
14 | #define pmd_ERROR(e) \ | |
15 | printk("%s:%d: bad pmd %p(%016Lx).\n", \ | |
16 | __FILE__, __LINE__, &(e), pmd_val(e)) | |
17 | #define pgd_ERROR(e) \ | |
18 | printk("%s:%d: bad pgd %p(%016Lx).\n", \ | |
19 | __FILE__, __LINE__, &(e), pgd_val(e)) | |
6194ba6f JF |
20 | |
21 | static inline int pud_none(pud_t pud) | |
22 | { | |
23 | return pud_val(pud) == 0; | |
24 | } | |
4b01fef8 | 25 | |
6194ba6f JF |
26 | static inline int pud_bad(pud_t pud) |
27 | { | |
59438c9f | 28 | return (pud_val(pud) & ~(PTE_PFN_MASK | _KERNPG_TABLE | _PAGE_USER)) != 0; |
6194ba6f | 29 | } |
4b01fef8 | 30 | |
1da177e4 LT |
31 | /* Rules for using set_pte: the pte being assigned *must* be |
32 | * either not present or in a state where the hardware will | |
33 | * not attempt to update the pte. In places where this is | |
34 | * not possible, use pte_get_and_clear to obtain the old pte | |
35 | * value and then use set_pte to update it. -ben | |
36 | */ | |
3dc494e8 | 37 | static inline void native_set_pte(pte_t *ptep, pte_t pte) |
1da177e4 LT |
38 | { |
39 | ptep->pte_high = pte.pte_high; | |
40 | smp_wmb(); | |
41 | ptep->pte_low = pte.pte_low; | |
42 | } | |
1da177e4 | 43 | |
d6d861e3 ZA |
44 | /* |
45 | * Since this is only called on user PTEs, and the page fault handler | |
46 | * must handle the already racy situation of simultaneous page faults, | |
47 | * we are justified in merely clearing the PTE present bit, followed | |
48 | * by a set. The ordering here is important. | |
49 | */ | |
4b01fef8 JP |
50 | static inline void native_set_pte_present(struct mm_struct *mm, |
51 | unsigned long addr, | |
3dc494e8 | 52 | pte_t *ptep, pte_t pte) |
d6d861e3 ZA |
53 | { |
54 | ptep->pte_low = 0; | |
55 | smp_wmb(); | |
56 | ptep->pte_high = pte.pte_high; | |
57 | smp_wmb(); | |
58 | ptep->pte_low = pte.pte_low; | |
59 | } | |
60 | ||
3dc494e8 JF |
61 | static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) |
62 | { | |
4b01fef8 | 63 | set_64bit((unsigned long long *)(ptep), native_pte_val(pte)); |
3dc494e8 | 64 | } |
4b01fef8 | 65 | |
3dc494e8 JF |
66 | static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) |
67 | { | |
4b01fef8 | 68 | set_64bit((unsigned long long *)(pmdp), native_pmd_val(pmd)); |
3dc494e8 | 69 | } |
4b01fef8 | 70 | |
3dc494e8 JF |
71 | static inline void native_set_pud(pud_t *pudp, pud_t pud) |
72 | { | |
4b01fef8 | 73 | set_64bit((unsigned long long *)(pudp), native_pud_val(pud)); |
3dc494e8 | 74 | } |
1da177e4 | 75 | |
6e5882cf ZA |
76 | /* |
77 | * For PTEs and PDEs, we must clear the P-bit first when clearing a page table | |
78 | * entry, so clear the bottom half first and enforce ordering with a compiler | |
79 | * barrier. | |
80 | */ | |
4b01fef8 JP |
81 | static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, |
82 | pte_t *ptep) | |
6e5882cf ZA |
83 | { |
84 | ptep->pte_low = 0; | |
85 | smp_wmb(); | |
86 | ptep->pte_high = 0; | |
87 | } | |
88 | ||
3dc494e8 | 89 | static inline void native_pmd_clear(pmd_t *pmd) |
6e5882cf ZA |
90 | { |
91 | u32 *tmp = (u32 *)pmd; | |
92 | *tmp = 0; | |
93 | smp_wmb(); | |
94 | *(tmp + 1) = 0; | |
95 | } | |
3dc494e8 | 96 | |
6194ba6f JF |
97 | static inline void pud_clear(pud_t *pudp) |
98 | { | |
edd6bcd8 JF |
99 | unsigned long pgd; |
100 | ||
6194ba6f JF |
101 | set_pud(pudp, __pud(0)); |
102 | ||
103 | /* | |
f5430f93 JF |
104 | * According to Intel App note "TLBs, Paging-Structure Caches, |
105 | * and Their Invalidation", April 2007, document 317080-001, | |
106 | * section 8.1: in PAE mode we explicitly have to flush the | |
107 | * TLB via cr3 if the top-level pgd is changed... | |
6194ba6f | 108 | * |
edd6bcd8 JF |
109 | * Make sure the pud entry we're updating is within the |
110 | * current pgd to avoid unnecessary TLB flushes. | |
6194ba6f | 111 | */ |
edd6bcd8 | 112 | pgd = read_cr3(); |
4b01fef8 JP |
113 | if (__pa(pudp) >= pgd && __pa(pudp) < |
114 | (pgd + sizeof(pgd_t)*PTRS_PER_PGD)) | |
edd6bcd8 | 115 | write_cr3(pgd); |
6194ba6f | 116 | } |
da181a8b | 117 | |
da181a8b | 118 | /* Find an entry in the second-level page table.. */ |
ab00fee3 | 119 | #define pmd_offset(pud, address) ((pmd_t *)pud_page_vaddr(*(pud)) + \ |
4b01fef8 | 120 | pmd_index(address)) |
6e5882cf | 121 | |
142dd975 | 122 | #ifdef CONFIG_SMP |
3dc494e8 | 123 | static inline pte_t native_ptep_get_and_clear(pte_t *ptep) |
1da177e4 LT |
124 | { |
125 | pte_t res; | |
126 | ||
127 | /* xchg acts as a barrier before the setting of the high bits */ | |
128 | res.pte_low = xchg(&ptep->pte_low, 0); | |
129 | res.pte_high = ptep->pte_high; | |
130 | ptep->pte_high = 0; | |
131 | ||
132 | return res; | |
133 | } | |
142dd975 ZA |
134 | #else |
135 | #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) | |
136 | #endif | |
1da177e4 | 137 | |
1da177e4 LT |
138 | /* |
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. | |
141 | */ | |
142 | #define pte_to_pgoff(pte) ((pte).pte_high) | |
4b01fef8 JP |
143 | #define pgoff_to_pte(off) \ |
144 | ((pte_t) { { .pte_low = _PAGE_FILE, .pte_high = (off) } }) | |
1da177e4 LT |
145 | #define PTE_FILE_MAX_BITS 32 |
146 | ||
147 | /* Encode and de-code a swap entry */ | |
1796316a | 148 | #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > 5) |
1da177e4 LT |
149 | #define __swp_type(x) (((x).val) & 0x1f) |
150 | #define __swp_offset(x) ((x).val >> 5) | |
151 | #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) << 5}) | |
152 | #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high }) | |
c8e5393a | 153 | #define __swp_entry_to_pte(x) ((pte_t){ { .pte_high = (x).val } }) |
1da177e4 | 154 | |
1965aae3 | 155 | #endif /* _ASM_X86_PGTABLE_3LEVEL_H */ |