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 */
14 static inline void native_set_pte(pte_t *ptep , pte_t pte)
15 {
16 *ptep = pte;
17 }
18
19 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
20 {
21 *pmdp = pmd;
22 }
23
24 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
25 {
26 native_set_pte(ptep, pte);
27 }
28
29 static 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
35 static inline void native_pmd_clear(pmd_t *pmdp)
36 {
37 native_set_pmd(pmdp, __pmd(0));
38 }
39
40 static 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
46 static 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 */
78
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