1 #ifndef _ASM_X86_PGTABLE_2LEVEL_H
2 #define _ASM_X86_PGTABLE_2LEVEL_H
5 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
7 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
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.
14 static inline void native_set_pte(pte_t *ptep , pte_t pte)
19 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
24 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
26 native_set_pte(ptep, pte);
29 static inline void native_set_pte_present(struct mm_struct *mm,
31 pte_t *ptep, pte_t pte)
33 native_set_pte(ptep, pte);
36 static inline void native_pmd_clear(pmd_t *pmdp)
38 native_set_pmd(pmdp, __pmd(0));
41 static inline void native_pte_clear(struct mm_struct *mm,
42 unsigned long addr, pte_t *xp)
44 *xp = native_make_pte(0);
48 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
50 return __pte(xchg(&xp->pte_low, 0));
53 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
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:
60 #define PTE_FILE_MAX_BITS 29
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)
66 #define PTE_FILE_SHIFT2 (_PAGE_BIT_PROTNONE + 1)
67 #define PTE_FILE_SHIFT3 (_PAGE_BIT_FILE + 1)
69 #define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
70 #define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
72 #define pte_to_pgoff(pte) \
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)))
80 #define pgoff_to_pte(off) \
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)) \
85 + (((off) >> (PTE_FILE_BITS1 + PTE_FILE_BITS2)) \
89 /* Encode and de-code a swap entry */
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)
94 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
95 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
98 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
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) })
106 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
107 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
109 #endif /* _ASM_X86_PGTABLE_2LEVEL_H */