projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | |
| 65e05d15 JP |
29 | static inline void native_set_pte_present(struct mm_struct *mm, |
| 30 | unsigned long addr, | |
| 4891645e JF |
31 | pte_t *ptep, pte_t pte) |
| 32 | { | |
| 33 | native_set_pte(ptep, pte); | |
| 34 | } | |
| 35 | ||
| 36 | static inline void native_pmd_clear(pmd_t *pmdp) | |
| 37 | { | |
| 38 | native_set_pmd(pmdp, __pmd(0)); | |
| 39 | } | |
| 6e5882cf | 40 | |
| 65e05d15 JP |
41 | static inline void native_pte_clear(struct mm_struct *mm, |
| 42 | unsigned long addr, pte_t *xp) | |
| c2c1accd | 43 | { |
| 4891645e | 44 | *xp = native_make_pte(0); |
| c2c1accd ZA |
45 | } |
| 46 | ||
| 142dd975 | 47 | #ifdef CONFIG_SMP |
| 3dc494e8 JF |
48 | static inline pte_t native_ptep_get_and_clear(pte_t *xp) |
| 49 | { | |
| 50 | return __pte(xchg(&xp->pte_low, 0)); | |
| 51 | } | |
| 142dd975 ZA |
52 | #else |
| 53 | #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) | |
| 54 | #endif | |
| 6049742d | 55 | |
| 1da177e4 | 56 | /* |
| 1796316a JB |
57 | * Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken, |
| 58 | * split up the 29 bits of offset into this range: | |
| 1da177e4 LT |
59 | */ |
| 60 | #define PTE_FILE_MAX_BITS 29 | |
| 1796316a JB |
61 | #define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1) |
| 62 | #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE | |
| 63 | #define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1) | |
| 64 | #define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1) | |
| 65 | #else | |
| 66 | #define PTE_FILE_SHIFT2 (_PAGE_BIT_PROTNONE + 1) | |
| 67 | #define PTE_FILE_SHIFT3 (_PAGE_BIT_FILE + 1) | |
| 68 | #endif | |
| 69 | #define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1) | |
| 70 | #define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1) | |
| 1da177e4 | 71 | |
| 65e05d15 | 72 | #define pte_to_pgoff(pte) \ |
| 1796316a JB |
73 | ((((pte).pte_low >> PTE_FILE_SHIFT1) \ |
| 74 | & ((1U << PTE_FILE_BITS1) - 1)) \ | |
| 75 | + ((((pte).pte_low >> PTE_FILE_SHIFT2) \ | |
| 76 | & ((1U << PTE_FILE_BITS2) - 1)) << PTE_FILE_BITS1) \ | |
| 77 | + (((pte).pte_low >> PTE_FILE_SHIFT3) \ | |
| 78 | << (PTE_FILE_BITS1 + PTE_FILE_BITS2))) | |
| 1da177e4 | 79 | |
| 65e05d15 | 80 | #define pgoff_to_pte(off) \ |
| 1796316a JB |
81 | ((pte_t) { .pte_low = \ |
| 82 | (((off) & ((1U << PTE_FILE_BITS1) - 1)) << PTE_FILE_SHIFT1) \ | |
| 83 | + ((((off) >> PTE_FILE_BITS1) & ((1U << PTE_FILE_BITS2) - 1)) \ | |
| 84 | << PTE_FILE_SHIFT2) \ | |
| 85 | + (((off) >> (PTE_FILE_BITS1 + PTE_FILE_BITS2)) \ | |
| 86 | << PTE_FILE_SHIFT3) \ | |
| 87 | + _PAGE_FILE }) | |
| 1da177e4 LT |
88 | |
| 89 | /* Encode and de-code a swap entry */ | |
| 1796316a JB |
90 | #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE |
| 91 | #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1) | |
| 92 | #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) | |
| 93 | #else | |
| 94 | #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1) | |
| 95 | #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1) | |
| 96 | #endif | |
| 97 | ||
| 98 | #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) | |
| 99 | ||
| 100 | #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ | |
| 101 | & ((1U << SWP_TYPE_BITS) - 1)) | |
| 102 | #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) | |
| 103 | #define __swp_entry(type, offset) ((swp_entry_t) { \ | |
| 104 | ((type) << (_PAGE_BIT_PRESENT + 1)) \ | |
| 105 | | ((offset) << SWP_OFFSET_SHIFT) }) | |
| 1da177e4 | 106 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) |
| c8e5393a | 107 | #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) |
| 1da177e4 | 108 | |
| 1965aae3 | 109 | #endif /* _ASM_X86_PGTABLE_2LEVEL_H */ |