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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5270 | serge | 1 | #ifndef _ASM_X86_PGTABLE_2LEVEL_H |
| 2 | #define _ASM_X86_PGTABLE_2LEVEL_H |
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| 3 | |||
| 4 | #define pte_ERROR(e) \ |
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| 5 | pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low) |
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| 6 | #define pgd_ERROR(e) \ |
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| 7 | pr_err("%s:%d: bad pgd %08lx\n", __FILE__, __LINE__, pgd_val(e)) |
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| 8 | |||
| 9 | /* |
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| 10 | * Certain architectures need to do special things when PTEs |
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| 11 | * within a page table are directly modified. Thus, the following |
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| 12 | * hook is made available. |
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| 13 | */ |
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| 14 | static inline void native_set_pte(pte_t *ptep , pte_t pte) |
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| 15 | { |
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| 16 | *ptep = pte; |
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| 17 | } |
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| 18 | |||
| 19 | static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) |
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| 20 | { |
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| 21 | *pmdp = pmd; |
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| 22 | } |
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| 23 | |||
| 24 | static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) |
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| 25 | { |
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| 26 | native_set_pte(ptep, pte); |
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| 27 | } |
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| 28 | |||
| 29 | static inline void native_pmd_clear(pmd_t *pmdp) |
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| 30 | { |
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| 31 | native_set_pmd(pmdp, __pmd(0)); |
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| 32 | } |
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| 33 | |||
| 34 | static inline void native_pte_clear(struct mm_struct *mm, |
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| 35 | unsigned long addr, pte_t *xp) |
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| 36 | { |
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| 37 | *xp = native_make_pte(0); |
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| 38 | } |
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| 39 | |||
| 40 | #ifdef CONFIG_SMP |
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| 41 | static inline pte_t native_ptep_get_and_clear(pte_t *xp) |
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| 42 | { |
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| 43 | return __pte(xchg(&xp->pte_low, 0)); |
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| 44 | } |
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| 45 | #else |
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| 46 | #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) |
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| 47 | #endif |
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| 48 | |||
| 49 | #ifdef CONFIG_SMP |
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| 50 | static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) |
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| 51 | { |
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| 52 | return __pmd(xchg((pmdval_t *)xp, 0)); |
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| 53 | } |
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| 54 | #else |
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| 55 | #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp) |
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| 56 | #endif |
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| 57 | |||
| 58 | /* Bit manipulation helper on pte/pgoff entry */ |
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| 59 | static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift, |
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| 60 | unsigned long mask, unsigned int leftshift) |
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| 61 | { |
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| 62 | return ((value >> rightshift) & mask) << leftshift; |
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| 63 | } |
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| 64 | |||
| 65 | /* |
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| 66 | * Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken, |
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| 67 | * split up the 29 bits of offset into this range. |
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| 68 | */ |
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| 69 | #define PTE_FILE_MAX_BITS 29 |
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| 70 | #define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1) |
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| 71 | #define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1) |
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| 72 | #define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1) |
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| 73 | #define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1) |
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| 74 | #define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1) |
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| 75 | |||
| 76 | #define PTE_FILE_MASK1 ((1U << PTE_FILE_BITS1) - 1) |
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| 77 | #define PTE_FILE_MASK2 ((1U << PTE_FILE_BITS2) - 1) |
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| 78 | |||
| 79 | #define PTE_FILE_LSHIFT2 (PTE_FILE_BITS1) |
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| 80 | #define PTE_FILE_LSHIFT3 (PTE_FILE_BITS1 + PTE_FILE_BITS2) |
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| 81 | |||
| 82 | static __always_inline pgoff_t pte_to_pgoff(pte_t pte) |
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| 83 | { |
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| 84 | return (pgoff_t) |
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| 85 | (pte_bitop(pte.pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0) + |
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| 86 | pte_bitop(pte.pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2) + |
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| 87 | pte_bitop(pte.pte_low, PTE_FILE_SHIFT3, -1UL, PTE_FILE_LSHIFT3)); |
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| 88 | } |
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| 89 | |||
| 90 | static __always_inline pte_t pgoff_to_pte(pgoff_t off) |
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| 91 | { |
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| 92 | return (pte_t){ |
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| 93 | .pte_low = |
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| 94 | pte_bitop(off, 0, PTE_FILE_MASK1, PTE_FILE_SHIFT1) + |
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| 95 | pte_bitop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2) + |
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| 96 | pte_bitop(off, PTE_FILE_LSHIFT3, -1UL, PTE_FILE_SHIFT3) + |
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| 97 | _PAGE_FILE, |
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| 98 | }; |
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| 99 | } |
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| 100 | |||
| 101 | /* Encode and de-code a swap entry */ |
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| 102 | #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1) |
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| 103 | #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) |
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| 104 | |||
| 105 | #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) |
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| 106 | |||
| 107 | #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ |
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| 108 | & ((1U << SWP_TYPE_BITS) - 1)) |
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| 109 | #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) |
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| 110 | #define __swp_entry(type, offset) ((swp_entry_t) { \ |
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| 111 | ((type) << (_PAGE_BIT_PRESENT + 1)) \ |
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| 112 | | ((offset) << SWP_OFFSET_SHIFT) }) |
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| 113 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) |
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| 114 | #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) |
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| 115 | |||
| 116 | #endif /* _ASM_X86_PGTABLE_2LEVEL_H */ |