1 #ifndef _I386_PGTABLE_2LEVEL_H
2 #define _I386_PGTABLE_2LEVEL_H
3
4 #include <asm-generic/pgtable-nopmd.h>
5
6 #define pte_ERROR(e) \
7 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
8 #define pgd_ERROR(e) \
9 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
10
11 /*
12 * Certain architectures need to do special things when PTEs
13 * within a page table are directly modified. Thus, the following
14 * hook is made available.
15 */
16 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
17 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
18 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
19
20 #define ptep_get_and_clear(xp) __pte(xchg(&(xp)->pte_low, 0))
21 #define pte_same(a, b) ((a).pte_low == (b).pte_low)
22 #define pte_page(x) pfn_to_page(pte_pfn(x))
23 #define pte_none(x) (!(x).pte_low)
24 #define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
25 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
26 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
27
28 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
29
30 #define pmd_page_kernel(pmd) \
31 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
32
33 /*
34 * All present user pages are user-executable:
35 */
36 static inline int pte_exec(pte_t pte)
37 {
38 return pte_user(pte);
39 }
40
41 /*
42 * All present pages are kernel-executable:
43 */
44 static inline int pte_exec_kernel(pte_t pte)
45 {
46 return 1;
47 }
48
49 /*
50 * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
51 * into this range:
52 */
53 #define PTE_FILE_MAX_BITS 29
54
55 #define pte_to_pgoff(pte) \
56 ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 ))
57
58 #define pgoff_to_pte(off) \
59 ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE })
60
61 /* Encode and de-code a swap entry */
62 #define __swp_type(x) (((x).val >> 1) & 0x1f)
63 #define __swp_offset(x) ((x).val >> 8)
64 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
65 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
66 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
67
68 #endif /* _I386_PGTABLE_2LEVEL_H */
69
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