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1965aae3 PA |
1 | #ifndef _ASM_X86_PGTABLE_2LEVEL_H |
2 | #define _ASM_X86_PGTABLE_2LEVEL_H | |
1da177e4 | 3 | |
1da177e4 LT |
4 | #define pte_ERROR(e) \ |
5 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low) | |
6 | #define pgd_ERROR(e) \ | |
7 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) | |
8 | ||
9 | /* | |
10 | * Certain architectures need to do special things when PTEs | |
11 | * within a page table are directly modified. Thus, the following | |
12 | * hook is made available. | |
13 | */ | |
3dc494e8 JF |
14 | static inline void native_set_pte(pte_t *ptep , pte_t pte) |
15 | { | |
16 | *ptep = pte; | |
17 | } | |
4891645e | 18 | |
3dc494e8 JF |
19 | static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) |
20 | { | |
21 | *pmdp = pmd; | |
22 | } | |
da181a8b | 23 | |
4891645e JF |
24 | static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) |
25 | { | |
26 | native_set_pte(ptep, pte); | |
27 | } | |
1da177e4 | 28 | |
4891645e JF |
29 | static inline void native_pmd_clear(pmd_t *pmdp) |
30 | { | |
31 | native_set_pmd(pmdp, __pmd(0)); | |
32 | } | |
6e5882cf | 33 | |
65e05d15 JP |
34 | static inline void native_pte_clear(struct mm_struct *mm, |
35 | unsigned long addr, pte_t *xp) | |
c2c1accd | 36 | { |
4891645e | 37 | *xp = native_make_pte(0); |
c2c1accd ZA |
38 | } |
39 | ||
142dd975 | 40 | #ifdef CONFIG_SMP |
3dc494e8 JF |
41 | static inline pte_t native_ptep_get_and_clear(pte_t *xp) |
42 | { | |
43 | return __pte(xchg(&xp->pte_low, 0)); | |
44 | } | |
142dd975 ZA |
45 | #else |
46 | #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) | |
47 | #endif | |
6049742d | 48 | |
f2d6bfe9 JW |
49 | #ifdef CONFIG_SMP |
50 | static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) | |
51 | { | |
52 | return __pmd(xchg((pmdval_t *)xp, 0)); | |
53 | } | |
54 | #else | |
55 | #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp) | |
56 | #endif | |
57 | ||
1da177e4 | 58 | /* |
1796316a JB |
59 | * Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken, |
60 | * split up the 29 bits of offset into this range: | |
1da177e4 LT |
61 | */ |
62 | #define PTE_FILE_MAX_BITS 29 | |
1796316a JB |
63 | #define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1) |
64 | #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE | |
65 | #define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1) | |
66 | #define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1) | |
67 | #else | |
68 | #define PTE_FILE_SHIFT2 (_PAGE_BIT_PROTNONE + 1) | |
69 | #define PTE_FILE_SHIFT3 (_PAGE_BIT_FILE + 1) | |
70 | #endif | |
71 | #define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1) | |
72 | #define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1) | |
1da177e4 | 73 | |
65e05d15 | 74 | #define pte_to_pgoff(pte) \ |
1796316a JB |
75 | ((((pte).pte_low >> PTE_FILE_SHIFT1) \ |
76 | & ((1U << PTE_FILE_BITS1) - 1)) \ | |
77 | + ((((pte).pte_low >> PTE_FILE_SHIFT2) \ | |
78 | & ((1U << PTE_FILE_BITS2) - 1)) << PTE_FILE_BITS1) \ | |
79 | + (((pte).pte_low >> PTE_FILE_SHIFT3) \ | |
80 | << (PTE_FILE_BITS1 + PTE_FILE_BITS2))) | |
1da177e4 | 81 | |
65e05d15 | 82 | #define pgoff_to_pte(off) \ |
1796316a JB |
83 | ((pte_t) { .pte_low = \ |
84 | (((off) & ((1U << PTE_FILE_BITS1) - 1)) << PTE_FILE_SHIFT1) \ | |
85 | + ((((off) >> PTE_FILE_BITS1) & ((1U << PTE_FILE_BITS2) - 1)) \ | |
86 | << PTE_FILE_SHIFT2) \ | |
87 | + (((off) >> (PTE_FILE_BITS1 + PTE_FILE_BITS2)) \ | |
88 | << PTE_FILE_SHIFT3) \ | |
89 | + _PAGE_FILE }) | |
1da177e4 LT |
90 | |
91 | /* Encode and de-code a swap entry */ | |
1796316a JB |
92 | #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE |
93 | #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1) | |
94 | #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) | |
95 | #else | |
96 | #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1) | |
97 | #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1) | |
98 | #endif | |
99 | ||
100 | #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) | |
101 | ||
102 | #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ | |
103 | & ((1U << SWP_TYPE_BITS) - 1)) | |
104 | #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) | |
105 | #define __swp_entry(type, offset) ((swp_entry_t) { \ | |
106 | ((type) << (_PAGE_BIT_PRESENT + 1)) \ | |
107 | | ((offset) << SWP_OFFSET_SHIFT) }) | |
1da177e4 | 108 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) |
c8e5393a | 109 | #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) |
1da177e4 | 110 | |
1965aae3 | 111 | #endif /* _ASM_X86_PGTABLE_2LEVEL_H */ |