diff options
author | Al Viro <viro@zeniv.linux.org.uk> | 2008-08-17 21:05:42 -0400 |
---|---|---|
committer | H. Peter Anvin <hpa@zytor.com> | 2008-10-23 01:55:20 -0400 |
commit | bb8985586b7a906e116db835c64773b7a7d51663 (patch) | |
tree | de93ae58e88cc563d95cc124a73f3930594c6100 /arch/x86/include/asm/pgtable-2level.h | |
parent | 8ede0bdb63305d3353efd97e9af6210afb05734e (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.h | 79 |
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 | */ | ||
14 | static inline void native_set_pte(pte_t *ptep , pte_t pte) | ||
15 | { | ||
16 | *ptep = pte; | ||
17 | } | ||
18 | |||
19 | static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) | ||
20 | { | ||
21 | *pmdp = pmd; | ||
22 | } | ||
23 | |||
24 | static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) | ||
25 | { | ||
26 | native_set_pte(ptep, pte); | ||
27 | } | ||
28 | |||
29 | static 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 | |||
36 | static inline void native_pmd_clear(pmd_t *pmdp) | ||
37 | { | ||
38 | native_set_pmd(pmdp, __pmd(0)); | ||
39 | } | ||
40 | |||
41 | static 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 | ||
48 | static 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 */ | ||