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Linux kernel mirror (for testing)
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kernel
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linux
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_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
18#define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
19#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
20
21#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte_low, 0))
22#define pte_same(a, b) ((a).pte_low == (b).pte_low)
23#define pte_page(x) pfn_to_page(pte_pfn(x))
24#define pte_none(x) (!(x).pte_low)
25#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
26#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
27#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
28
29/*
30 * All present user pages are user-executable:
31 */
32static inline int pte_exec(pte_t pte)
33{
34 return pte_user(pte);
35}
36
37/*
38 * All present pages are kernel-executable:
39 */
40static inline int pte_exec_kernel(pte_t pte)
41{
42 return 1;
43}
44
45/*
46 * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
47 * into this range:
48 */
49#define PTE_FILE_MAX_BITS 29
50
51#define pte_to_pgoff(pte) \
52 ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 ))
53
54#define pgoff_to_pte(off) \
55 ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE })
56
57/* Encode and de-code a swap entry */
58#define __swp_type(x) (((x).val >> 1) & 0x1f)
59#define __swp_offset(x) ((x).val >> 8)
60#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
61#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
62#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
63
64#endif /* _I386_PGTABLE_2LEVEL_H */