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1da177e4 LT |
1 | #ifndef _I386_PGTABLE_2LEVEL_H |
2 | #define _I386_PGTABLE_2LEVEL_H | |
3 | ||
1da177e4 LT |
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 | */ | |
3dc494e8 JF |
14 | static inline void native_set_pte(pte_t *ptep , pte_t pte) |
15 | { | |
16 | *ptep = pte; | |
17 | } | |
18 | static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr, | |
19 | pte_t *ptep , pte_t pte) | |
20 | { | |
21 | native_set_pte(ptep, pte); | |
22 | } | |
23 | static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) | |
24 | { | |
25 | *pmdp = pmd; | |
26 | } | |
da181a8b | 27 | #ifndef CONFIG_PARAVIRT |
3dc494e8 JF |
28 | #define set_pte(pteptr, pteval) native_set_pte(pteptr, pteval) |
29 | #define set_pte_at(mm,addr,ptep,pteval) native_set_pte_at(mm, addr, ptep, pteval) | |
30 | #define set_pmd(pmdptr, pmdval) native_set_pmd(pmdptr, pmdval) | |
da181a8b RR |
31 | #endif |
32 | ||
1da177e4 | 33 | #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval) |
d6d861e3 | 34 | #define set_pte_present(mm,addr,ptep,pteval) set_pte_at(mm,addr,ptep,pteval) |
1da177e4 | 35 | |
6e5882cf ZA |
36 | #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) |
37 | #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) | |
38 | ||
c2c1accd ZA |
39 | static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *xp) |
40 | { | |
41 | *xp = __pte(0); | |
42 | } | |
43 | ||
142dd975 | 44 | #ifdef CONFIG_SMP |
3dc494e8 JF |
45 | static inline pte_t native_ptep_get_and_clear(pte_t *xp) |
46 | { | |
47 | return __pte(xchg(&xp->pte_low, 0)); | |
48 | } | |
142dd975 ZA |
49 | #else |
50 | #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) | |
51 | #endif | |
6049742d | 52 | |
1da177e4 LT |
53 | #define pte_page(x) pfn_to_page(pte_pfn(x)) |
54 | #define pte_none(x) (!(x).pte_low) | |
3dc494e8 | 55 | #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) |
1da177e4 LT |
56 | #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) |
57 | #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) | |
58 | ||
1da177e4 LT |
59 | /* |
60 | * All present pages are kernel-executable: | |
61 | */ | |
62 | static inline int pte_exec_kernel(pte_t pte) | |
63 | { | |
64 | return 1; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Bits 0, 6 and 7 are taken, split up the 29 bits of offset | |
69 | * into this range: | |
70 | */ | |
71 | #define PTE_FILE_MAX_BITS 29 | |
72 | ||
73 | #define pte_to_pgoff(pte) \ | |
74 | ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 )) | |
75 | ||
76 | #define pgoff_to_pte(off) \ | |
77 | ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE }) | |
78 | ||
79 | /* Encode and de-code a swap entry */ | |
80 | #define __swp_type(x) (((x).val >> 1) & 0x1f) | |
81 | #define __swp_offset(x) ((x).val >> 8) | |
82 | #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) }) | |
83 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) | |
84 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) | |
85 | ||
86 | #endif /* _I386_PGTABLE_2LEVEL_H */ |