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Linux kernel mirror (for testing)
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linux
1#ifndef _I386_PGTABLE_2LEVEL_H
2#define _I386_PGTABLE_2LEVEL_H
3
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 */
14static inline void native_set_pte(pte_t *ptep , pte_t pte)
15{
16 *ptep = pte;
17}
18
19static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
20{
21 *pmdp = pmd;
22}
23
24static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
25{
26 native_set_pte(ptep, pte);
27}
28
29static inline void native_set_pte_present(struct mm_struct *mm,
30 unsigned long addr,
31 pte_t *ptep, pte_t pte)
32{
33 native_set_pte(ptep, pte);
34}
35
36static inline void native_pmd_clear(pmd_t *pmdp)
37{
38 native_set_pmd(pmdp, __pmd(0));
39}
40
41static inline void native_pte_clear(struct mm_struct *mm,
42 unsigned long addr, pte_t *xp)
43{
44 *xp = native_make_pte(0);
45}
46
47#ifdef CONFIG_SMP
48static inline pte_t native_ptep_get_and_clear(pte_t *xp)
49{
50 return __pte(xchg(&xp->pte_low, 0));
51}
52#else
53#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
54#endif
55
56#define pte_page(x) pfn_to_page(pte_pfn(x))
57#define pte_none(x) (!(x).pte_low)
58#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
59
60/*
61 * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
62 * into this range:
63 */
64#define PTE_FILE_MAX_BITS 29
65
66#define pte_to_pgoff(pte) \
67 ((((pte).pte_low >> 1) & 0x1f) + (((pte).pte_low >> 8) << 5))
68
69#define pgoff_to_pte(off) \
70 ((pte_t) { .pte_low = (((off) & 0x1f) << 1) + \
71 (((off) >> 5) << 8) + _PAGE_FILE })
72
73/* Encode and de-code a swap entry */
74#define __swp_type(x) (((x).val >> 1) & 0x1f)
75#define __swp_offset(x) ((x).val >> 8)
76#define __swp_entry(type, offset) \
77 ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
78#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
79#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
80
81#endif /* _I386_PGTABLE_2LEVEL_H */