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}
18static 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}
23static 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
39static 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
45static 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 */
62static 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