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1965aae3 PA |
1 | #ifndef _ASM_X86_PGTABLE_2LEVEL_H |
2 | #define _ASM_X86_PGTABLE_2LEVEL_H | |
1da177e4 | 3 | |
1da177e4 | 4 | #define pte_ERROR(e) \ |
c767a54b | 5 | pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low) |
1da177e4 | 6 | #define pgd_ERROR(e) \ |
c767a54b | 7 | pr_err("%s:%d: bad pgd %08lx\n", __FILE__, __LINE__, pgd_val(e)) |
1da177e4 LT |
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 | */ | |
3dc494e8 JF |
14 | static inline void native_set_pte(pte_t *ptep , pte_t pte) |
15 | { | |
16 | *ptep = pte; | |
17 | } | |
4891645e | 18 | |
3dc494e8 JF |
19 | static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) |
20 | { | |
21 | *pmdp = pmd; | |
22 | } | |
da181a8b | 23 | |
4891645e JF |
24 | static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) |
25 | { | |
26 | native_set_pte(ptep, pte); | |
27 | } | |
1da177e4 | 28 | |
4891645e JF |
29 | static inline void native_pmd_clear(pmd_t *pmdp) |
30 | { | |
31 | native_set_pmd(pmdp, __pmd(0)); | |
32 | } | |
6e5882cf | 33 | |
65e05d15 JP |
34 | static inline void native_pte_clear(struct mm_struct *mm, |
35 | unsigned long addr, pte_t *xp) | |
c2c1accd | 36 | { |
4891645e | 37 | *xp = native_make_pte(0); |
c2c1accd ZA |
38 | } |
39 | ||
142dd975 | 40 | #ifdef CONFIG_SMP |
3dc494e8 JF |
41 | static inline pte_t native_ptep_get_and_clear(pte_t *xp) |
42 | { | |
43 | return __pte(xchg(&xp->pte_low, 0)); | |
44 | } | |
142dd975 ZA |
45 | #else |
46 | #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) | |
47 | #endif | |
6049742d | 48 | |
f2d6bfe9 JW |
49 | #ifdef CONFIG_SMP |
50 | static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) | |
51 | { | |
52 | return __pmd(xchg((pmdval_t *)xp, 0)); | |
53 | } | |
54 | #else | |
55 | #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp) | |
56 | #endif | |
57 | ||
5305ca10 CG |
58 | /* Bit manipulation helper on pte/pgoff entry */ |
59 | static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift, | |
60 | unsigned long mask, unsigned int leftshift) | |
61 | { | |
62 | return ((value >> rightshift) & mask) << leftshift; | |
63 | } | |
64 | ||
1da177e4 | 65 | /* Encode and de-code a swap entry */ |
0a191362 | 66 | #define SWP_TYPE_BITS 5 |
1796316a | 67 | #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) |
1796316a JB |
68 | |
69 | #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) | |
70 | ||
71 | #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ | |
72 | & ((1U << SWP_TYPE_BITS) - 1)) | |
73 | #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) | |
74 | #define __swp_entry(type, offset) ((swp_entry_t) { \ | |
75 | ((type) << (_PAGE_BIT_PRESENT + 1)) \ | |
76 | | ((offset) << SWP_OFFSET_SHIFT) }) | |
1da177e4 | 77 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) |
c8e5393a | 78 | #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) |
1da177e4 | 79 | |
1965aae3 | 80 | #endif /* _ASM_X86_PGTABLE_2LEVEL_H */ |