1 #ifndef _ASM_X86_PGTABLE_2LEVEL_H
2 #define _ASM_X86_PGTABLE_2LEVEL_H
5 pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low)
7 pr_err("%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_pmd_clear(pmd_t *pmdp)
31 native_set_pmd(pmdp, __pmd(0));
34 static inline void native_pte_clear(struct mm_struct *mm,
35 unsigned long addr, pte_t *xp)
37 *xp = native_make_pte(0);
41 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
43 return __pte(xchg(&xp->pte_low, 0));
46 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
50 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
52 return __pmd(xchg((pmdval_t *)xp, 0));
55 #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
58 /* Bit manipulation helper on pte/pgoff entry */
59 static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift,
60 unsigned long mask, unsigned int leftshift)
62 return ((value >> rightshift) & mask) << leftshift;
65 #ifdef CONFIG_MEM_SOFT_DIRTY
68 * Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE, _PAGE_BIT_SOFT_DIRTY and
69 * _PAGE_BIT_PROTNONE are taken, split up the 28 bits of offset
72 #define PTE_FILE_MAX_BITS 28
73 #define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1)
74 #define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1)
75 #define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1)
76 #define PTE_FILE_SHIFT4 (_PAGE_BIT_SOFT_DIRTY + 1)
77 #define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
78 #define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
79 #define PTE_FILE_BITS3 (PTE_FILE_SHIFT4 - PTE_FILE_SHIFT3 - 1)
81 #define PTE_FILE_MASK1 ((1U << PTE_FILE_BITS1) - 1)
82 #define PTE_FILE_MASK2 ((1U << PTE_FILE_BITS2) - 1)
83 #define PTE_FILE_MASK3 ((1U << PTE_FILE_BITS3) - 1)
85 #define PTE_FILE_LSHIFT2 (PTE_FILE_BITS1)
86 #define PTE_FILE_LSHIFT3 (PTE_FILE_BITS1 + PTE_FILE_BITS2)
87 #define PTE_FILE_LSHIFT4 (PTE_FILE_BITS1 + PTE_FILE_BITS2 + PTE_FILE_BITS3)
89 static __always_inline pgoff_t pte_to_pgoff(pte_t pte)
92 (pte_bitop(pte.pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0) +
93 pte_bitop(pte.pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2) +
94 pte_bitop(pte.pte_low, PTE_FILE_SHIFT3, PTE_FILE_MASK3, PTE_FILE_LSHIFT3) +
95 pte_bitop(pte.pte_low, PTE_FILE_SHIFT4, -1UL, PTE_FILE_LSHIFT4));
98 static __always_inline pte_t pgoff_to_pte(pgoff_t off)
102 pte_bitop(off, 0, PTE_FILE_MASK1, PTE_FILE_SHIFT1) +
103 pte_bitop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2) +
104 pte_bitop(off, PTE_FILE_LSHIFT3, PTE_FILE_MASK3, PTE_FILE_SHIFT3) +
105 pte_bitop(off, PTE_FILE_LSHIFT4, -1UL, PTE_FILE_SHIFT4) +
110 #else /* CONFIG_MEM_SOFT_DIRTY */
113 * Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken,
114 * split up the 29 bits of offset into this range.
116 #define PTE_FILE_MAX_BITS 29
117 #define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1)
118 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
119 #define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1)
120 #define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1)
122 #define PTE_FILE_SHIFT2 (_PAGE_BIT_PROTNONE + 1)
123 #define PTE_FILE_SHIFT3 (_PAGE_BIT_FILE + 1)
125 #define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
126 #define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
128 #define PTE_FILE_MASK1 ((1U << PTE_FILE_BITS1) - 1)
129 #define PTE_FILE_MASK2 ((1U << PTE_FILE_BITS2) - 1)
131 #define PTE_FILE_LSHIFT2 (PTE_FILE_BITS1)
132 #define PTE_FILE_LSHIFT3 (PTE_FILE_BITS1 + PTE_FILE_BITS2)
134 static __always_inline pgoff_t pte_to_pgoff(pte_t pte)
137 (pte_bitop(pte.pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0) +
138 pte_bitop(pte.pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2) +
139 pte_bitop(pte.pte_low, PTE_FILE_SHIFT3, -1UL, PTE_FILE_LSHIFT3));
142 static __always_inline pte_t pgoff_to_pte(pgoff_t off)
146 pte_bitop(off, 0, PTE_FILE_MASK1, PTE_FILE_SHIFT1) +
147 pte_bitop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2) +
148 pte_bitop(off, PTE_FILE_LSHIFT3, -1UL, PTE_FILE_SHIFT3) +
153 #endif /* CONFIG_MEM_SOFT_DIRTY */
155 /* Encode and de-code a swap entry */
156 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
157 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
158 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
160 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
161 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
164 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
166 #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
167 & ((1U << SWP_TYPE_BITS) - 1))
168 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
169 #define __swp_entry(type, offset) ((swp_entry_t) { \
170 ((type) << (_PAGE_BIT_PRESENT + 1)) \
171 | ((offset) << SWP_OFFSET_SHIFT) })
172 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
173 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
175 #endif /* _ASM_X86_PGTABLE_2LEVEL_H */