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 */
native_set_pte(pte_t * ptep,pte_t pte)14 static inline void native_set_pte(pte_t *ptep , pte_t pte)
15 {
16 *ptep = pte;
17 }
native_set_pte_at(struct mm_struct * mm,unsigned long addr,pte_t * ptep,pte_t pte)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 }
native_set_pmd(pmd_t * pmdp,pmd_t pmd)23 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
24 {
25 *pmdp = pmd;
26 }
27 #ifndef CONFIG_PARAVIRT
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)
31 #endif
32
33 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
34 #define set_pte_present(mm,addr,ptep,pteval) set_pte_at(mm,addr,ptep,pteval)
35
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
native_pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * xp)39 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *xp)
40 {
41 *xp = __pte(0);
42 }
43
44 #ifdef CONFIG_SMP
native_ptep_get_and_clear(pte_t * xp)45 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
46 {
47 return __pte(xchg(&xp->pte_low, 0));
48 }
49 #else
50 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
51 #endif
52
53 #define pte_page(x) pfn_to_page(pte_pfn(x))
54 #define pte_none(x) (!(x).pte_low)
55 #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
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
59 /*
60 * All present pages are kernel-executable:
61 */
pte_exec_kernel(pte_t pte)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 */
87