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authorAl Viro <viro@zeniv.linux.org.uk>2008-08-17 21:05:42 -0400
committerH. Peter Anvin <hpa@zytor.com>2008-10-23 01:55:20 -0400
commitbb8985586b7a906e116db835c64773b7a7d51663 (patch)
treede93ae58e88cc563d95cc124a73f3930594c6100 /arch/x86/include/asm/pgtable-2level.h
parent8ede0bdb63305d3353efd97e9af6210afb05734e (diff)
x86, um: ... and asm-x86 move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/include/asm/pgtable-2level.h')
-rw-r--r--arch/x86/include/asm/pgtable-2level.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable-2level.h b/arch/x86/include/asm/pgtable-2level.h
new file mode 100644
index 000000000000..81762081dcd8
--- /dev/null
+++ b/arch/x86/include/asm/pgtable-2level.h
@@ -0,0 +1,79 @@
1#ifndef ASM_X86__PGTABLE_2LEVEL_H
2#define ASM_X86__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}
18
19static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
20{
21 *pmdp = pmd;
22}
23
24static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
25{
26 native_set_pte(ptep, pte);
27}
28
29static inline void native_set_pte_present(struct mm_struct *mm,
30 unsigned long addr,
31 pte_t *ptep, pte_t pte)
32{
33 native_set_pte(ptep, pte);
34}
35
36static inline void native_pmd_clear(pmd_t *pmdp)
37{
38 native_set_pmd(pmdp, __pmd(0));
39}
40
41static inline void native_pte_clear(struct mm_struct *mm,
42 unsigned long addr, pte_t *xp)
43{
44 *xp = native_make_pte(0);
45}
46
47#ifdef CONFIG_SMP
48static inline pte_t native_ptep_get_and_clear(pte_t *xp)
49{
50 return __pte(xchg(&xp->pte_low, 0));
51}
52#else
53#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
54#endif
55
56#define pte_none(x) (!(x).pte_low)
57
58/*
59 * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
60 * into this range:
61 */
62#define PTE_FILE_MAX_BITS 29
63
64#define pte_to_pgoff(pte) \
65 ((((pte).pte_low >> 1) & 0x1f) + (((pte).pte_low >> 8) << 5))
66
67#define pgoff_to_pte(off) \
68 ((pte_t) { .pte_low = (((off) & 0x1f) << 1) + \
69 (((off) >> 5) << 8) + _PAGE_FILE })
70
71/* Encode and de-code a swap entry */
72#define __swp_type(x) (((x).val >> 1) & 0x1f)
73#define __swp_offset(x) ((x).val >> 8)
74#define __swp_entry(type, offset) \
75 ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
76#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
77#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
78
79#endif /* ASM_X86__PGTABLE_2LEVEL_H */