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1#ifndef _ASM_X86_PGTABLE_2LEVEL_H
2#define _ASM_X86_PGTABLE_2LEVEL_H
3
4#define pte_ERROR(e) \
5 pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low)
6#define pgd_ERROR(e) \
7 pr_err("%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_pud(pud_t *pudp, pud_t pud)
25{
26}
27
28static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
29{
30 native_set_pte(ptep, pte);
31}
32
33static inline void native_pmd_clear(pmd_t *pmdp)
34{
35 native_set_pmd(pmdp, __pmd(0));
36}
37
38static inline void native_pud_clear(pud_t *pudp)
39{
40}
41
42static inline void native_pte_clear(struct mm_struct *mm,
43 unsigned long addr, pte_t *xp)
44{
45 *xp = native_make_pte(0);
46}
47
48#ifdef CONFIG_SMP
49static inline pte_t native_ptep_get_and_clear(pte_t *xp)
50{
51 return __pte(xchg(&xp->pte_low, 0));
52}
53#else
54#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
55#endif
56
57#ifdef CONFIG_SMP
58static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
59{
60 return __pmd(xchg((pmdval_t *)xp, 0));
61}
62#else
63#define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
64#endif
65
66#ifdef CONFIG_SMP
67static inline pud_t native_pudp_get_and_clear(pud_t *xp)
68{
69 return __pud(xchg((pudval_t *)xp, 0));
70}
71#else
72#define native_pudp_get_and_clear(xp) native_local_pudp_get_and_clear(xp)
73#endif
74
75/* Bit manipulation helper on pte/pgoff entry */
76static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift,
77 unsigned long mask, unsigned int leftshift)
78{
79 return ((value >> rightshift) & mask) << leftshift;
80}
81
82/* Encode and de-code a swap entry */
83#define SWP_TYPE_BITS 5
84#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
85
86#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
87
88#define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
89 & ((1U << SWP_TYPE_BITS) - 1))
90#define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
91#define __swp_entry(type, offset) ((swp_entry_t) { \
92 ((type) << (_PAGE_BIT_PRESENT + 1)) \
93 | ((offset) << SWP_OFFSET_SHIFT) })
94#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
95#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
96
97#endif /* _ASM_X86_PGTABLE_2LEVEL_H */