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