1 #ifndef _ASM_X86_PGALLOC_H
2 #define _ASM_X86_PGALLOC_H
3
4 #include <linux/threads.h>
5 #include <linux/mm.h> /* for struct page */
6 #include <linux/pagemap.h>
7
8 static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
9
10 #ifdef CONFIG_PARAVIRT
11 #include <asm/paravirt.h>
12 #else
13 #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
14 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
15 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
16 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
17 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
18 unsigned long start, unsigned long count) {}
19 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
20 static inline void paravirt_release_pte(unsigned long pfn) {}
21 static inline void paravirt_release_pmd(unsigned long pfn) {}
22 static inline void paravirt_release_pud(unsigned long pfn) {}
23 #endif
24
25 /*
26 * Allocate and free page tables.
27 */
28 extern pgd_t *pgd_alloc(struct mm_struct *);
29 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
30
31 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
32 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
33
34 /* Should really implement gc for free page table pages. This could be
35 done with a reference count in struct page. */
36
37 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
38 {
39 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
40 free_page((unsigned long)pte);
41 }
42
43 static inline void pte_free(struct mm_struct *mm, struct page *pte)
44 {
45 pgtable_page_dtor(pte);
46 __free_page(pte);
47 }
48
49 extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
50
51 static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
52 unsigned long address)
53 {
54 ___pte_free_tlb(tlb, pte);
55 }
56
57 static inline void pmd_populate_kernel(struct mm_struct *mm,
58 pmd_t *pmd, pte_t *pte)
59 {
60 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
61 set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
62 }
63
64 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
65 struct page *pte)
66 {
67 unsigned long pfn = page_to_pfn(pte);
68
69 paravirt_alloc_pte(mm, pfn);
70 set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
71 }
72
73 #define pmd_pgtable(pmd) pmd_page(pmd)
74
75 #if PAGETABLE_LEVELS > 2
76 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
77 {
78 return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
79 }
80
81 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
82 {
83 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
84 free_page((unsigned long)pmd);
85 }
86
87 extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
88
89 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
90 unsigned long adddress)
91 {
92 ___pmd_free_tlb(tlb, pmd);
93 }
94
95 #ifdef CONFIG_X86_PAE
96 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
97 #else /* !CONFIG_X86_PAE */
98 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
99 {
100 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
101 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
102 }
103 #endif /* CONFIG_X86_PAE */
104
105 #if PAGETABLE_LEVELS > 3
106 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
107 {
108 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
109 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
110 }
111
112 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
113 {
114 return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
115 }
116
117 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
118 {
119 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
120 free_page((unsigned long)pud);
121 }
122
123 extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
124
125 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
126 unsigned long address)
127 {
128 ___pud_free_tlb(tlb, pud);
129 }
130
131 #endif /* PAGETABLE_LEVELS > 3 */
132 #endif /* PAGETABLE_LEVELS > 2 */
133
134 #endif /* _ASM_X86_PGALLOC_H */
135
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